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Commit | Line | Data |
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09e410de JE |
1 | /* |
2 | * xt_hashlimit - Netfilter module to limit the number of packets per time | |
3 | * seperately 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> |
1da177e4 | 29 | |
39b46fc6 | 30 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 31 | #include <linux/netfilter_ipv4/ip_tables.h> |
39b46fc6 PM |
32 | #include <linux/netfilter_ipv6/ip6_tables.h> |
33 | #include <linux/netfilter/xt_hashlimit.h> | |
14cc3e2b | 34 | #include <linux/mutex.h> |
1da177e4 LT |
35 | |
36 | MODULE_LICENSE("GPL"); | |
37 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
09e410de | 38 | MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); |
2ae15b64 | 39 | MODULE_DESCRIPTION("Xtables: per hash-bucket rate-limit match"); |
39b46fc6 PM |
40 | MODULE_ALIAS("ipt_hashlimit"); |
41 | MODULE_ALIAS("ip6t_hashlimit"); | |
1da177e4 LT |
42 | |
43 | /* need to declare this at the top */ | |
39b46fc6 PM |
44 | static struct proc_dir_entry *hashlimit_procdir4; |
45 | static struct proc_dir_entry *hashlimit_procdir6; | |
da7071d7 | 46 | static const struct file_operations dl_file_ops; |
1da177e4 LT |
47 | |
48 | /* hash table crap */ | |
1da177e4 | 49 | struct dsthash_dst { |
39b46fc6 PM |
50 | union { |
51 | struct { | |
52 | __be32 src; | |
53 | __be32 dst; | |
54 | } ip; | |
7b21e09d | 55 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
39b46fc6 PM |
56 | struct { |
57 | __be32 src[4]; | |
58 | __be32 dst[4]; | |
59 | } ip6; | |
7b21e09d | 60 | #endif |
09e410de | 61 | }; |
6a19d614 AV |
62 | __be16 src_port; |
63 | __be16 dst_port; | |
1da177e4 LT |
64 | }; |
65 | ||
66 | struct dsthash_ent { | |
67 | /* static / read-only parts in the beginning */ | |
68 | struct hlist_node node; | |
69 | struct dsthash_dst dst; | |
70 | ||
71 | /* modified structure members in the end */ | |
72 | unsigned long expires; /* precalculated expiry time */ | |
73 | struct { | |
74 | unsigned long prev; /* last modification */ | |
75 | u_int32_t credit; | |
76 | u_int32_t credit_cap, cost; | |
77 | } rateinfo; | |
78 | }; | |
79 | ||
39b46fc6 | 80 | struct xt_hashlimit_htable { |
1da177e4 LT |
81 | struct hlist_node node; /* global list of all htables */ |
82 | atomic_t use; | |
39b46fc6 | 83 | int family; |
1da177e4 | 84 | |
09e410de | 85 | struct hashlimit_cfg1 cfg; /* config */ |
1da177e4 LT |
86 | |
87 | /* used internally */ | |
88 | spinlock_t lock; /* lock for list_head */ | |
89 | u_int32_t rnd; /* random seed for hash */ | |
bf0857ea | 90 | int rnd_initialized; |
39b46fc6 | 91 | unsigned int count; /* number entries in table */ |
1da177e4 | 92 | struct timer_list timer; /* timer for gc */ |
1da177e4 LT |
93 | |
94 | /* seq_file stuff */ | |
95 | struct proc_dir_entry *pde; | |
96 | ||
97 | struct hlist_head hash[0]; /* hashtable itself */ | |
98 | }; | |
99 | ||
e45b1be8 | 100 | static DEFINE_SPINLOCK(hashlimit_lock); /* protects htables list */ |
14cc3e2b | 101 | static DEFINE_MUTEX(hlimit_mutex); /* additional checkentry protection */ |
1da177e4 | 102 | static HLIST_HEAD(hashlimit_htables); |
e18b890b | 103 | static struct kmem_cache *hashlimit_cachep __read_mostly; |
1da177e4 | 104 | |
1d93a9cb | 105 | static inline bool dst_cmp(const struct dsthash_ent *ent, |
a47362a2 | 106 | const struct dsthash_dst *b) |
1da177e4 | 107 | { |
39b46fc6 | 108 | return !memcmp(&ent->dst, b, sizeof(ent->dst)); |
1da177e4 LT |
109 | } |
110 | ||
39b46fc6 PM |
111 | static u_int32_t |
112 | hash_dst(const struct xt_hashlimit_htable *ht, const struct dsthash_dst *dst) | |
1da177e4 | 113 | { |
e2f82ac3 ED |
114 | u_int32_t hash = jhash2((const u32 *)dst, |
115 | sizeof(*dst)/sizeof(u32), | |
116 | ht->rnd); | |
117 | /* | |
118 | * Instead of returning hash % ht->cfg.size (implying a divide) | |
119 | * we return the high 32 bits of the (hash * ht->cfg.size) that will | |
120 | * give results between [0 and cfg.size-1] and same hash distribution, | |
121 | * but using a multiply, less expensive than a divide | |
122 | */ | |
123 | return ((u64)hash * ht->cfg.size) >> 32; | |
1da177e4 LT |
124 | } |
125 | ||
39b46fc6 | 126 | static struct dsthash_ent * |
a47362a2 JE |
127 | dsthash_find(const struct xt_hashlimit_htable *ht, |
128 | const struct dsthash_dst *dst) | |
1da177e4 LT |
129 | { |
130 | struct dsthash_ent *ent; | |
131 | struct hlist_node *pos; | |
132 | u_int32_t hash = hash_dst(ht, dst); | |
133 | ||
39b46fc6 PM |
134 | if (!hlist_empty(&ht->hash[hash])) { |
135 | hlist_for_each_entry(ent, pos, &ht->hash[hash], node) | |
136 | if (dst_cmp(ent, dst)) | |
1da177e4 | 137 | return ent; |
39b46fc6 | 138 | } |
1da177e4 LT |
139 | return NULL; |
140 | } | |
141 | ||
142 | /* allocate dsthash_ent, initialize dst, put in htable and lock it */ | |
143 | static struct dsthash_ent * | |
a47362a2 JE |
144 | dsthash_alloc_init(struct xt_hashlimit_htable *ht, |
145 | const struct dsthash_dst *dst) | |
1da177e4 LT |
146 | { |
147 | struct dsthash_ent *ent; | |
148 | ||
149 | /* initialize hash with random val at the time we allocate | |
150 | * the first hashtable entry */ | |
bf0857ea | 151 | if (!ht->rnd_initialized) { |
1da177e4 | 152 | get_random_bytes(&ht->rnd, 4); |
bf0857ea PM |
153 | ht->rnd_initialized = 1; |
154 | } | |
1da177e4 | 155 | |
39b46fc6 | 156 | if (ht->cfg.max && ht->count >= ht->cfg.max) { |
1da177e4 LT |
157 | /* FIXME: do something. question is what.. */ |
158 | if (net_ratelimit()) | |
39b46fc6 PM |
159 | printk(KERN_WARNING |
160 | "xt_hashlimit: max count of %u reached\n", | |
1da177e4 LT |
161 | ht->cfg.max); |
162 | return NULL; | |
163 | } | |
164 | ||
165 | ent = kmem_cache_alloc(hashlimit_cachep, GFP_ATOMIC); | |
166 | if (!ent) { | |
167 | if (net_ratelimit()) | |
39b46fc6 PM |
168 | printk(KERN_ERR |
169 | "xt_hashlimit: can't allocate dsthash_ent\n"); | |
1da177e4 LT |
170 | return NULL; |
171 | } | |
39b46fc6 | 172 | memcpy(&ent->dst, dst, sizeof(ent->dst)); |
1da177e4 LT |
173 | |
174 | hlist_add_head(&ent->node, &ht->hash[hash_dst(ht, dst)]); | |
39b46fc6 | 175 | ht->count++; |
1da177e4 LT |
176 | return ent; |
177 | } | |
178 | ||
39b46fc6 PM |
179 | static inline void |
180 | dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent) | |
1da177e4 LT |
181 | { |
182 | hlist_del(&ent->node); | |
183 | kmem_cache_free(hashlimit_cachep, ent); | |
39b46fc6 | 184 | ht->count--; |
1da177e4 LT |
185 | } |
186 | static void htable_gc(unsigned long htlong); | |
187 | ||
09e410de | 188 | static int htable_create_v0(struct xt_hashlimit_info *minfo, int family) |
1da177e4 | 189 | { |
39b46fc6 | 190 | struct xt_hashlimit_htable *hinfo; |
1da177e4 | 191 | unsigned int size; |
39b46fc6 | 192 | unsigned int i; |
1da177e4 LT |
193 | |
194 | if (minfo->cfg.size) | |
195 | size = minfo->cfg.size; | |
196 | else { | |
39b46fc6 PM |
197 | size = ((num_physpages << PAGE_SHIFT) / 16384) / |
198 | sizeof(struct list_head); | |
1da177e4 LT |
199 | if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
200 | size = 8192; | |
201 | if (size < 16) | |
202 | size = 16; | |
203 | } | |
204 | /* FIXME: don't use vmalloc() here or anywhere else -HW */ | |
39b46fc6 PM |
205 | hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) + |
206 | sizeof(struct list_head) * size); | |
1da177e4 | 207 | if (!hinfo) { |
39b46fc6 | 208 | printk(KERN_ERR "xt_hashlimit: unable to create hashtable\n"); |
1da177e4 LT |
209 | return -1; |
210 | } | |
211 | minfo->hinfo = hinfo; | |
212 | ||
213 | /* copy match config into hashtable config */ | |
09e410de JE |
214 | hinfo->cfg.mode = minfo->cfg.mode; |
215 | hinfo->cfg.avg = minfo->cfg.avg; | |
216 | hinfo->cfg.burst = minfo->cfg.burst; | |
217 | hinfo->cfg.max = minfo->cfg.max; | |
218 | hinfo->cfg.gc_interval = minfo->cfg.gc_interval; | |
219 | hinfo->cfg.expire = minfo->cfg.expire; | |
220 | ||
221 | if (family == AF_INET) | |
222 | hinfo->cfg.srcmask = hinfo->cfg.dstmask = 32; | |
223 | else | |
224 | hinfo->cfg.srcmask = hinfo->cfg.dstmask = 128; | |
225 | ||
1da177e4 LT |
226 | hinfo->cfg.size = size; |
227 | if (!hinfo->cfg.max) | |
228 | hinfo->cfg.max = 8 * hinfo->cfg.size; | |
229 | else if (hinfo->cfg.max < hinfo->cfg.size) | |
230 | hinfo->cfg.max = hinfo->cfg.size; | |
231 | ||
232 | for (i = 0; i < hinfo->cfg.size; i++) | |
233 | INIT_HLIST_HEAD(&hinfo->hash[i]); | |
234 | ||
1da177e4 | 235 | atomic_set(&hinfo->use, 1); |
39b46fc6 PM |
236 | hinfo->count = 0; |
237 | hinfo->family = family; | |
bf0857ea | 238 | hinfo->rnd_initialized = 0; |
1da177e4 | 239 | spin_lock_init(&hinfo->lock); |
8eeee8b1 DL |
240 | hinfo->pde = proc_create(minfo->name, 0, |
241 | family == AF_INET ? hashlimit_procdir4 : | |
242 | hashlimit_procdir6, | |
243 | &dl_file_ops); | |
1da177e4 LT |
244 | if (!hinfo->pde) { |
245 | vfree(hinfo); | |
246 | return -1; | |
247 | } | |
1da177e4 LT |
248 | hinfo->pde->data = hinfo; |
249 | ||
e6f689db | 250 | setup_timer(&hinfo->timer, htable_gc, (unsigned long )hinfo); |
1da177e4 | 251 | hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval); |
1da177e4 LT |
252 | add_timer(&hinfo->timer); |
253 | ||
e45b1be8 | 254 | spin_lock_bh(&hashlimit_lock); |
1da177e4 | 255 | hlist_add_head(&hinfo->node, &hashlimit_htables); |
e45b1be8 | 256 | spin_unlock_bh(&hashlimit_lock); |
1da177e4 LT |
257 | |
258 | return 0; | |
259 | } | |
260 | ||
09e410de JE |
261 | static int htable_create(struct xt_hashlimit_mtinfo1 *minfo, |
262 | unsigned int family) | |
263 | { | |
264 | struct xt_hashlimit_htable *hinfo; | |
265 | unsigned int size; | |
266 | unsigned int i; | |
267 | ||
268 | if (minfo->cfg.size) { | |
269 | size = minfo->cfg.size; | |
270 | } else { | |
271 | size = (num_physpages << PAGE_SHIFT) / 16384 / | |
272 | sizeof(struct list_head); | |
273 | if (num_physpages > 1024 * 1024 * 1024 / PAGE_SIZE) | |
274 | size = 8192; | |
275 | if (size < 16) | |
276 | size = 16; | |
277 | } | |
278 | /* FIXME: don't use vmalloc() here or anywhere else -HW */ | |
279 | hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) + | |
280 | sizeof(struct list_head) * size); | |
281 | if (hinfo == NULL) { | |
282 | printk(KERN_ERR "xt_hashlimit: unable to create hashtable\n"); | |
283 | return -1; | |
284 | } | |
285 | minfo->hinfo = hinfo; | |
286 | ||
287 | /* copy match config into hashtable config */ | |
288 | memcpy(&hinfo->cfg, &minfo->cfg, sizeof(hinfo->cfg)); | |
289 | hinfo->cfg.size = size; | |
290 | if (hinfo->cfg.max == 0) | |
291 | hinfo->cfg.max = 8 * hinfo->cfg.size; | |
292 | else if (hinfo->cfg.max < hinfo->cfg.size) | |
293 | hinfo->cfg.max = hinfo->cfg.size; | |
294 | ||
295 | for (i = 0; i < hinfo->cfg.size; i++) | |
296 | INIT_HLIST_HEAD(&hinfo->hash[i]); | |
297 | ||
298 | atomic_set(&hinfo->use, 1); | |
299 | hinfo->count = 0; | |
300 | hinfo->family = family; | |
301 | hinfo->rnd_initialized = 0; | |
302 | spin_lock_init(&hinfo->lock); | |
303 | ||
8eeee8b1 DL |
304 | hinfo->pde = proc_create(minfo->name, 0, |
305 | family == AF_INET ? hashlimit_procdir4 : | |
306 | hashlimit_procdir6, | |
307 | &dl_file_ops); | |
09e410de JE |
308 | if (hinfo->pde == NULL) { |
309 | vfree(hinfo); | |
310 | return -1; | |
311 | } | |
09e410de JE |
312 | hinfo->pde->data = hinfo; |
313 | ||
314 | setup_timer(&hinfo->timer, htable_gc, (unsigned long)hinfo); | |
315 | hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval); | |
316 | add_timer(&hinfo->timer); | |
317 | ||
318 | spin_lock_bh(&hashlimit_lock); | |
319 | hlist_add_head(&hinfo->node, &hashlimit_htables); | |
320 | spin_unlock_bh(&hashlimit_lock); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
a47362a2 JE |
325 | static bool select_all(const struct xt_hashlimit_htable *ht, |
326 | const struct dsthash_ent *he) | |
1da177e4 LT |
327 | { |
328 | return 1; | |
329 | } | |
330 | ||
a47362a2 JE |
331 | static bool select_gc(const struct xt_hashlimit_htable *ht, |
332 | const struct dsthash_ent *he) | |
1da177e4 | 333 | { |
cbebc51f | 334 | return time_after_eq(jiffies, he->expires); |
1da177e4 LT |
335 | } |
336 | ||
39b46fc6 | 337 | static void htable_selective_cleanup(struct xt_hashlimit_htable *ht, |
a47362a2 JE |
338 | bool (*select)(const struct xt_hashlimit_htable *ht, |
339 | const struct dsthash_ent *he)) | |
1da177e4 | 340 | { |
39b46fc6 | 341 | unsigned int i; |
1da177e4 LT |
342 | |
343 | /* lock hash table and iterate over it */ | |
344 | spin_lock_bh(&ht->lock); | |
345 | for (i = 0; i < ht->cfg.size; i++) { | |
346 | struct dsthash_ent *dh; | |
347 | struct hlist_node *pos, *n; | |
348 | hlist_for_each_entry_safe(dh, pos, n, &ht->hash[i], node) { | |
349 | if ((*select)(ht, dh)) | |
39b46fc6 | 350 | dsthash_free(ht, dh); |
1da177e4 LT |
351 | } |
352 | } | |
353 | spin_unlock_bh(&ht->lock); | |
354 | } | |
355 | ||
356 | /* hash table garbage collector, run by timer */ | |
357 | static void htable_gc(unsigned long htlong) | |
358 | { | |
39b46fc6 | 359 | struct xt_hashlimit_htable *ht = (struct xt_hashlimit_htable *)htlong; |
1da177e4 LT |
360 | |
361 | htable_selective_cleanup(ht, select_gc); | |
362 | ||
363 | /* re-add the timer accordingly */ | |
364 | ht->timer.expires = jiffies + msecs_to_jiffies(ht->cfg.gc_interval); | |
365 | add_timer(&ht->timer); | |
366 | } | |
367 | ||
39b46fc6 | 368 | static void htable_destroy(struct xt_hashlimit_htable *hinfo) |
1da177e4 LT |
369 | { |
370 | /* remove timer, if it is pending */ | |
371 | if (timer_pending(&hinfo->timer)) | |
372 | del_timer(&hinfo->timer); | |
373 | ||
374 | /* remove proc entry */ | |
39b46fc6 PM |
375 | remove_proc_entry(hinfo->pde->name, |
376 | hinfo->family == AF_INET ? hashlimit_procdir4 : | |
601e68e1 | 377 | hashlimit_procdir6); |
1da177e4 LT |
378 | htable_selective_cleanup(hinfo, select_all); |
379 | vfree(hinfo); | |
380 | } | |
381 | ||
a47362a2 JE |
382 | static struct xt_hashlimit_htable *htable_find_get(const char *name, |
383 | int family) | |
1da177e4 | 384 | { |
39b46fc6 | 385 | struct xt_hashlimit_htable *hinfo; |
1da177e4 LT |
386 | struct hlist_node *pos; |
387 | ||
e45b1be8 | 388 | spin_lock_bh(&hashlimit_lock); |
1da177e4 | 389 | hlist_for_each_entry(hinfo, pos, &hashlimit_htables, node) { |
39b46fc6 PM |
390 | if (!strcmp(name, hinfo->pde->name) && |
391 | hinfo->family == family) { | |
1da177e4 | 392 | atomic_inc(&hinfo->use); |
e45b1be8 | 393 | spin_unlock_bh(&hashlimit_lock); |
1da177e4 LT |
394 | return hinfo; |
395 | } | |
396 | } | |
e45b1be8 | 397 | spin_unlock_bh(&hashlimit_lock); |
1da177e4 LT |
398 | return NULL; |
399 | } | |
400 | ||
39b46fc6 | 401 | static void htable_put(struct xt_hashlimit_htable *hinfo) |
1da177e4 LT |
402 | { |
403 | if (atomic_dec_and_test(&hinfo->use)) { | |
e45b1be8 | 404 | spin_lock_bh(&hashlimit_lock); |
1da177e4 | 405 | hlist_del(&hinfo->node); |
e45b1be8 | 406 | spin_unlock_bh(&hashlimit_lock); |
1da177e4 LT |
407 | htable_destroy(hinfo); |
408 | } | |
409 | } | |
410 | ||
1da177e4 LT |
411 | /* The algorithm used is the Simple Token Bucket Filter (TBF) |
412 | * see net/sched/sch_tbf.c in the linux source tree | |
413 | */ | |
414 | ||
415 | /* Rusty: This is my (non-mathematically-inclined) understanding of | |
416 | this algorithm. The `average rate' in jiffies becomes your initial | |
417 | amount of credit `credit' and the most credit you can ever have | |
418 | `credit_cap'. The `peak rate' becomes the cost of passing the | |
419 | test, `cost'. | |
420 | ||
421 | `prev' tracks the last packet hit: you gain one credit per jiffy. | |
422 | If you get credit balance more than this, the extra credit is | |
423 | discarded. Every time the match passes, you lose `cost' credits; | |
424 | if you don't have that many, the test fails. | |
425 | ||
426 | See Alexey's formal explanation in net/sched/sch_tbf.c. | |
427 | ||
428 | To get the maximum range, we multiply by this factor (ie. you get N | |
429 | credits per jiffy). We want to allow a rate as low as 1 per day | |
430 | (slowest userspace tool allows), which means | |
431 | CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32 ie. | |
432 | */ | |
433 | #define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24)) | |
434 | ||
435 | /* Repeated shift and or gives us all 1s, final shift and add 1 gives | |
436 | * us the power of 2 below the theoretical max, so GCC simply does a | |
437 | * shift. */ | |
438 | #define _POW2_BELOW2(x) ((x)|((x)>>1)) | |
439 | #define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2)) | |
440 | #define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4)) | |
441 | #define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8)) | |
442 | #define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16)) | |
443 | #define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1) | |
444 | ||
445 | #define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ) | |
446 | ||
447 | /* Precision saver. */ | |
448 | static inline u_int32_t | |
449 | user2credits(u_int32_t user) | |
450 | { | |
451 | /* If multiplying would overflow... */ | |
452 | if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY)) | |
453 | /* Divide first. */ | |
39b46fc6 | 454 | return (user / XT_HASHLIMIT_SCALE) * HZ * CREDITS_PER_JIFFY; |
1da177e4 | 455 | |
39b46fc6 | 456 | return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE; |
1da177e4 LT |
457 | } |
458 | ||
459 | static inline void rateinfo_recalc(struct dsthash_ent *dh, unsigned long now) | |
460 | { | |
39b46fc6 | 461 | dh->rateinfo.credit += (now - dh->rateinfo.prev) * CREDITS_PER_JIFFY; |
1da177e4 LT |
462 | if (dh->rateinfo.credit > dh->rateinfo.credit_cap) |
463 | dh->rateinfo.credit = dh->rateinfo.credit_cap; | |
39b46fc6 PM |
464 | dh->rateinfo.prev = now; |
465 | } | |
466 | ||
09e410de JE |
467 | static inline __be32 maskl(__be32 a, unsigned int l) |
468 | { | |
469 | return htonl(ntohl(a) & ~(~(u_int32_t)0 >> l)); | |
470 | } | |
471 | ||
3ed5df44 | 472 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
09e410de JE |
473 | static void hashlimit_ipv6_mask(__be32 *i, unsigned int p) |
474 | { | |
475 | switch (p) { | |
476 | case 0: | |
477 | i[0] = i[1] = 0; | |
478 | i[2] = i[3] = 0; | |
479 | break; | |
480 | case 1 ... 31: | |
481 | i[0] = maskl(i[0], p); | |
482 | i[1] = i[2] = i[3] = 0; | |
483 | break; | |
484 | case 32: | |
485 | i[1] = i[2] = i[3] = 0; | |
486 | break; | |
487 | case 33 ... 63: | |
488 | i[1] = maskl(i[1], p - 32); | |
489 | i[2] = i[3] = 0; | |
490 | break; | |
491 | case 64: | |
492 | i[2] = i[3] = 0; | |
493 | break; | |
494 | case 65 ... 95: | |
495 | i[2] = maskl(i[2], p - 64); | |
496 | i[3] = 0; | |
497 | case 96: | |
498 | i[3] = 0; | |
499 | break; | |
500 | case 97 ... 127: | |
501 | i[3] = maskl(i[3], p - 96); | |
502 | break; | |
503 | case 128: | |
504 | break; | |
505 | } | |
506 | } | |
3ed5df44 | 507 | #endif |
09e410de | 508 | |
39b46fc6 | 509 | static int |
a47362a2 JE |
510 | hashlimit_init_dst(const struct xt_hashlimit_htable *hinfo, |
511 | struct dsthash_dst *dst, | |
39b46fc6 PM |
512 | const struct sk_buff *skb, unsigned int protoff) |
513 | { | |
514 | __be16 _ports[2], *ports; | |
193b23c5 | 515 | u8 nexthdr; |
39b46fc6 PM |
516 | |
517 | memset(dst, 0, sizeof(*dst)); | |
518 | ||
519 | switch (hinfo->family) { | |
520 | case AF_INET: | |
521 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP) | |
09e410de JE |
522 | dst->ip.dst = maskl(ip_hdr(skb)->daddr, |
523 | hinfo->cfg.dstmask); | |
39b46fc6 | 524 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP) |
09e410de JE |
525 | dst->ip.src = maskl(ip_hdr(skb)->saddr, |
526 | hinfo->cfg.srcmask); | |
39b46fc6 PM |
527 | |
528 | if (!(hinfo->cfg.mode & | |
529 | (XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT))) | |
530 | return 0; | |
eddc9ec5 | 531 | nexthdr = ip_hdr(skb)->protocol; |
39b46fc6 | 532 | break; |
02dba025 | 533 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
39b46fc6 | 534 | case AF_INET6: |
09e410de JE |
535 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DIP) { |
536 | memcpy(&dst->ip6.dst, &ipv6_hdr(skb)->daddr, | |
537 | sizeof(dst->ip6.dst)); | |
538 | hashlimit_ipv6_mask(dst->ip6.dst, hinfo->cfg.dstmask); | |
539 | } | |
540 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SIP) { | |
541 | memcpy(&dst->ip6.src, &ipv6_hdr(skb)->saddr, | |
542 | sizeof(dst->ip6.src)); | |
543 | hashlimit_ipv6_mask(dst->ip6.src, hinfo->cfg.srcmask); | |
544 | } | |
39b46fc6 PM |
545 | |
546 | if (!(hinfo->cfg.mode & | |
547 | (XT_HASHLIMIT_HASH_DPT | XT_HASHLIMIT_HASH_SPT))) | |
548 | return 0; | |
193b23c5 PM |
549 | nexthdr = ipv6_hdr(skb)->nexthdr; |
550 | protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); | |
551 | if ((int)protoff < 0) | |
39b46fc6 PM |
552 | return -1; |
553 | break; | |
554 | #endif | |
555 | default: | |
556 | BUG(); | |
557 | return 0; | |
558 | } | |
559 | ||
560 | switch (nexthdr) { | |
561 | case IPPROTO_TCP: | |
562 | case IPPROTO_UDP: | |
a8d0f952 | 563 | case IPPROTO_UDPLITE: |
39b46fc6 PM |
564 | case IPPROTO_SCTP: |
565 | case IPPROTO_DCCP: | |
566 | ports = skb_header_pointer(skb, protoff, sizeof(_ports), | |
567 | &_ports); | |
568 | break; | |
569 | default: | |
570 | _ports[0] = _ports[1] = 0; | |
571 | ports = _ports; | |
572 | break; | |
573 | } | |
574 | if (!ports) | |
575 | return -1; | |
576 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_SPT) | |
577 | dst->src_port = ports[0]; | |
578 | if (hinfo->cfg.mode & XT_HASHLIMIT_HASH_DPT) | |
579 | dst->dst_port = ports[1]; | |
580 | return 0; | |
1da177e4 LT |
581 | } |
582 | ||
1d93a9cb | 583 | static bool |
09e410de JE |
584 | hashlimit_mt_v0(const struct sk_buff *skb, const struct net_device *in, |
585 | const struct net_device *out, const struct xt_match *match, | |
586 | const void *matchinfo, int offset, unsigned int protoff, | |
587 | bool *hotdrop) | |
1da177e4 | 588 | { |
a47362a2 JE |
589 | const struct xt_hashlimit_info *r = |
590 | ((const struct xt_hashlimit_info *)matchinfo)->u.master; | |
39b46fc6 | 591 | struct xt_hashlimit_htable *hinfo = r->hinfo; |
1da177e4 LT |
592 | unsigned long now = jiffies; |
593 | struct dsthash_ent *dh; | |
594 | struct dsthash_dst dst; | |
595 | ||
39b46fc6 PM |
596 | if (hashlimit_init_dst(hinfo, &dst, skb, protoff) < 0) |
597 | goto hotdrop; | |
1da177e4 LT |
598 | |
599 | spin_lock_bh(&hinfo->lock); | |
39b46fc6 | 600 | dh = dsthash_find(hinfo, &dst); |
1da177e4 | 601 | if (!dh) { |
39b46fc6 | 602 | dh = dsthash_alloc_init(hinfo, &dst); |
1da177e4 | 603 | if (!dh) { |
1da177e4 | 604 | spin_unlock_bh(&hinfo->lock); |
39b46fc6 | 605 | goto hotdrop; |
1da177e4 LT |
606 | } |
607 | ||
608 | dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire); | |
1da177e4 | 609 | dh->rateinfo.prev = jiffies; |
39b46fc6 PM |
610 | dh->rateinfo.credit = user2credits(hinfo->cfg.avg * |
611 | hinfo->cfg.burst); | |
612 | dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg * | |
613 | hinfo->cfg.burst); | |
1da177e4 | 614 | dh->rateinfo.cost = user2credits(hinfo->cfg.avg); |
1c7628bd PM |
615 | } else { |
616 | /* update expiration timeout */ | |
617 | dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire); | |
618 | rateinfo_recalc(dh, now); | |
1da177e4 LT |
619 | } |
620 | ||
1da177e4 LT |
621 | if (dh->rateinfo.credit >= dh->rateinfo.cost) { |
622 | /* We're underlimit. */ | |
623 | dh->rateinfo.credit -= dh->rateinfo.cost; | |
624 | spin_unlock_bh(&hinfo->lock); | |
1d93a9cb | 625 | return true; |
1da177e4 LT |
626 | } |
627 | ||
601e68e1 | 628 | spin_unlock_bh(&hinfo->lock); |
1da177e4 LT |
629 | |
630 | /* default case: we're overlimit, thus don't match */ | |
1d93a9cb | 631 | return false; |
39b46fc6 PM |
632 | |
633 | hotdrop: | |
cff533ac | 634 | *hotdrop = true; |
1d93a9cb | 635 | return false; |
1da177e4 LT |
636 | } |
637 | ||
ccb79bdc | 638 | static bool |
09e410de JE |
639 | hashlimit_mt(const struct sk_buff *skb, const struct net_device *in, |
640 | const struct net_device *out, const struct xt_match *match, | |
641 | const void *matchinfo, int offset, unsigned int protoff, | |
642 | bool *hotdrop) | |
643 | { | |
644 | const struct xt_hashlimit_mtinfo1 *info = matchinfo; | |
645 | struct xt_hashlimit_htable *hinfo = info->hinfo; | |
646 | unsigned long now = jiffies; | |
647 | struct dsthash_ent *dh; | |
648 | struct dsthash_dst dst; | |
649 | ||
650 | if (hashlimit_init_dst(hinfo, &dst, skb, protoff) < 0) | |
651 | goto hotdrop; | |
652 | ||
653 | spin_lock_bh(&hinfo->lock); | |
654 | dh = dsthash_find(hinfo, &dst); | |
655 | if (dh == NULL) { | |
656 | dh = dsthash_alloc_init(hinfo, &dst); | |
657 | if (dh == NULL) { | |
658 | spin_unlock_bh(&hinfo->lock); | |
659 | goto hotdrop; | |
660 | } | |
661 | ||
662 | dh->expires = jiffies + msecs_to_jiffies(hinfo->cfg.expire); | |
663 | dh->rateinfo.prev = jiffies; | |
664 | dh->rateinfo.credit = user2credits(hinfo->cfg.avg * | |
665 | hinfo->cfg.burst); | |
666 | dh->rateinfo.credit_cap = user2credits(hinfo->cfg.avg * | |
667 | hinfo->cfg.burst); | |
668 | dh->rateinfo.cost = user2credits(hinfo->cfg.avg); | |
669 | } else { | |
670 | /* update expiration timeout */ | |
671 | dh->expires = now + msecs_to_jiffies(hinfo->cfg.expire); | |
672 | rateinfo_recalc(dh, now); | |
673 | } | |
674 | ||
675 | if (dh->rateinfo.credit >= dh->rateinfo.cost) { | |
676 | /* below the limit */ | |
677 | dh->rateinfo.credit -= dh->rateinfo.cost; | |
678 | spin_unlock_bh(&hinfo->lock); | |
679 | return !(info->cfg.mode & XT_HASHLIMIT_INVERT); | |
680 | } | |
681 | ||
682 | spin_unlock_bh(&hinfo->lock); | |
683 | /* default match is underlimit - so over the limit, we need to invert */ | |
684 | return info->cfg.mode & XT_HASHLIMIT_INVERT; | |
685 | ||
686 | hotdrop: | |
687 | *hotdrop = true; | |
688 | return false; | |
689 | } | |
690 | ||
691 | static bool | |
692 | hashlimit_mt_check_v0(const char *tablename, const void *inf, | |
693 | const struct xt_match *match, void *matchinfo, | |
694 | unsigned int hook_mask) | |
1da177e4 | 695 | { |
39b46fc6 | 696 | struct xt_hashlimit_info *r = matchinfo; |
1da177e4 | 697 | |
1da177e4 | 698 | /* Check for overflow. */ |
39b46fc6 PM |
699 | if (r->cfg.burst == 0 || |
700 | user2credits(r->cfg.avg * r->cfg.burst) < user2credits(r->cfg.avg)) { | |
701 | printk(KERN_ERR "xt_hashlimit: overflow, try lower: %u/%u\n", | |
1da177e4 | 702 | r->cfg.avg, r->cfg.burst); |
ccb79bdc | 703 | return false; |
1da177e4 | 704 | } |
39b46fc6 PM |
705 | if (r->cfg.mode == 0 || |
706 | r->cfg.mode > (XT_HASHLIMIT_HASH_DPT | | |
707 | XT_HASHLIMIT_HASH_DIP | | |
708 | XT_HASHLIMIT_HASH_SIP | | |
709 | XT_HASHLIMIT_HASH_SPT)) | |
ccb79bdc | 710 | return false; |
1da177e4 | 711 | if (!r->cfg.gc_interval) |
ccb79bdc | 712 | return false; |
1da177e4 | 713 | if (!r->cfg.expire) |
ccb79bdc | 714 | return false; |
3ab72088 | 715 | if (r->name[sizeof(r->name) - 1] != '\0') |
ccb79bdc | 716 | return false; |
3ab72088 | 717 | |
1da177e4 | 718 | /* This is the best we've got: We cannot release and re-grab lock, |
39b46fc6 PM |
719 | * since checkentry() is called before x_tables.c grabs xt_mutex. |
720 | * We also cannot grab the hashtable spinlock, since htable_create will | |
1da177e4 LT |
721 | * call vmalloc, and that can sleep. And we cannot just re-search |
722 | * the list of htable's in htable_create(), since then we would | |
723 | * create duplicate proc files. -HW */ | |
14cc3e2b | 724 | mutex_lock(&hlimit_mutex); |
39b46fc6 | 725 | r->hinfo = htable_find_get(r->name, match->family); |
09e410de | 726 | if (!r->hinfo && htable_create_v0(r, match->family) != 0) { |
14cc3e2b | 727 | mutex_unlock(&hlimit_mutex); |
ccb79bdc | 728 | return false; |
1da177e4 | 729 | } |
14cc3e2b | 730 | mutex_unlock(&hlimit_mutex); |
1da177e4 LT |
731 | |
732 | /* Ugly hack: For SMP, we only want to use one set */ | |
733 | r->u.master = r; | |
ccb79bdc | 734 | return true; |
1da177e4 LT |
735 | } |
736 | ||
09e410de JE |
737 | static bool |
738 | hashlimit_mt_check(const char *tablename, const void *inf, | |
739 | const struct xt_match *match, void *matchinfo, | |
740 | unsigned int hook_mask) | |
741 | { | |
742 | struct xt_hashlimit_mtinfo1 *info = matchinfo; | |
743 | ||
744 | /* Check for overflow. */ | |
745 | if (info->cfg.burst == 0 || | |
746 | user2credits(info->cfg.avg * info->cfg.burst) < | |
747 | user2credits(info->cfg.avg)) { | |
748 | printk(KERN_ERR "xt_hashlimit: overflow, try lower: %u/%u\n", | |
749 | info->cfg.avg, info->cfg.burst); | |
750 | return false; | |
751 | } | |
752 | if (info->cfg.gc_interval == 0 || info->cfg.expire == 0) | |
753 | return false; | |
754 | if (info->name[sizeof(info->name)-1] != '\0') | |
755 | return false; | |
756 | if (match->family == AF_INET) { | |
757 | if (info->cfg.srcmask > 32 || info->cfg.dstmask > 32) | |
758 | return false; | |
759 | } else { | |
760 | if (info->cfg.srcmask > 128 || info->cfg.dstmask > 128) | |
761 | return false; | |
762 | } | |
763 | ||
764 | /* This is the best we've got: We cannot release and re-grab lock, | |
765 | * since checkentry() is called before x_tables.c grabs xt_mutex. | |
766 | * We also cannot grab the hashtable spinlock, since htable_create will | |
767 | * call vmalloc, and that can sleep. And we cannot just re-search | |
768 | * the list of htable's in htable_create(), since then we would | |
769 | * create duplicate proc files. -HW */ | |
770 | mutex_lock(&hlimit_mutex); | |
771 | info->hinfo = htable_find_get(info->name, match->family); | |
772 | if (!info->hinfo && htable_create(info, match->family) != 0) { | |
773 | mutex_unlock(&hlimit_mutex); | |
774 | return false; | |
775 | } | |
776 | mutex_unlock(&hlimit_mutex); | |
09e410de JE |
777 | return true; |
778 | } | |
779 | ||
1da177e4 | 780 | static void |
09e410de | 781 | hashlimit_mt_destroy_v0(const struct xt_match *match, void *matchinfo) |
1da177e4 | 782 | { |
a47362a2 | 783 | const struct xt_hashlimit_info *r = matchinfo; |
1da177e4 LT |
784 | |
785 | htable_put(r->hinfo); | |
786 | } | |
787 | ||
09e410de JE |
788 | static void |
789 | hashlimit_mt_destroy(const struct xt_match *match, void *matchinfo) | |
790 | { | |
791 | const struct xt_hashlimit_mtinfo1 *info = matchinfo; | |
792 | ||
793 | htable_put(info->hinfo); | |
794 | } | |
795 | ||
127f15dd | 796 | #ifdef CONFIG_COMPAT |
39b46fc6 | 797 | struct compat_xt_hashlimit_info { |
127f15dd PM |
798 | char name[IFNAMSIZ]; |
799 | struct hashlimit_cfg cfg; | |
800 | compat_uptr_t hinfo; | |
801 | compat_uptr_t master; | |
802 | }; | |
803 | ||
d3c5ee6d | 804 | static void hashlimit_mt_compat_from_user(void *dst, void *src) |
127f15dd | 805 | { |
39b46fc6 | 806 | int off = offsetof(struct compat_xt_hashlimit_info, hinfo); |
127f15dd PM |
807 | |
808 | memcpy(dst, src, off); | |
39b46fc6 | 809 | memset(dst + off, 0, sizeof(struct compat_xt_hashlimit_info) - off); |
127f15dd PM |
810 | } |
811 | ||
d3c5ee6d | 812 | static int hashlimit_mt_compat_to_user(void __user *dst, void *src) |
127f15dd | 813 | { |
39b46fc6 | 814 | int off = offsetof(struct compat_xt_hashlimit_info, hinfo); |
127f15dd PM |
815 | |
816 | return copy_to_user(dst, src, off) ? -EFAULT : 0; | |
817 | } | |
818 | #endif | |
819 | ||
d3c5ee6d | 820 | static struct xt_match hashlimit_mt_reg[] __read_mostly = { |
39b46fc6 PM |
821 | { |
822 | .name = "hashlimit", | |
09e410de | 823 | .revision = 0, |
39b46fc6 | 824 | .family = AF_INET, |
09e410de | 825 | .match = hashlimit_mt_v0, |
39b46fc6 PM |
826 | .matchsize = sizeof(struct xt_hashlimit_info), |
827 | #ifdef CONFIG_COMPAT | |
828 | .compatsize = sizeof(struct compat_xt_hashlimit_info), | |
d3c5ee6d JE |
829 | .compat_from_user = hashlimit_mt_compat_from_user, |
830 | .compat_to_user = hashlimit_mt_compat_to_user, | |
39b46fc6 | 831 | #endif |
09e410de JE |
832 | .checkentry = hashlimit_mt_check_v0, |
833 | .destroy = hashlimit_mt_destroy_v0, | |
39b46fc6 PM |
834 | .me = THIS_MODULE |
835 | }, | |
09e410de JE |
836 | { |
837 | .name = "hashlimit", | |
838 | .revision = 1, | |
839 | .family = AF_INET, | |
840 | .match = hashlimit_mt, | |
841 | .matchsize = sizeof(struct xt_hashlimit_mtinfo1), | |
842 | .checkentry = hashlimit_mt_check, | |
843 | .destroy = hashlimit_mt_destroy, | |
844 | .me = THIS_MODULE, | |
845 | }, | |
7b21e09d | 846 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
39b46fc6 PM |
847 | { |
848 | .name = "hashlimit", | |
849 | .family = AF_INET6, | |
09e410de | 850 | .match = hashlimit_mt_v0, |
39b46fc6 | 851 | .matchsize = sizeof(struct xt_hashlimit_info), |
127f15dd | 852 | #ifdef CONFIG_COMPAT |
39b46fc6 | 853 | .compatsize = sizeof(struct compat_xt_hashlimit_info), |
d3c5ee6d JE |
854 | .compat_from_user = hashlimit_mt_compat_from_user, |
855 | .compat_to_user = hashlimit_mt_compat_to_user, | |
127f15dd | 856 | #endif |
09e410de JE |
857 | .checkentry = hashlimit_mt_check_v0, |
858 | .destroy = hashlimit_mt_destroy_v0, | |
39b46fc6 PM |
859 | .me = THIS_MODULE |
860 | }, | |
09e410de JE |
861 | { |
862 | .name = "hashlimit", | |
863 | .revision = 1, | |
864 | .family = AF_INET6, | |
865 | .match = hashlimit_mt, | |
866 | .matchsize = sizeof(struct xt_hashlimit_mtinfo1), | |
867 | .checkentry = hashlimit_mt_check, | |
868 | .destroy = hashlimit_mt_destroy, | |
869 | .me = THIS_MODULE, | |
870 | }, | |
7b21e09d | 871 | #endif |
1da177e4 LT |
872 | }; |
873 | ||
874 | /* PROC stuff */ | |
1da177e4 | 875 | static void *dl_seq_start(struct seq_file *s, loff_t *pos) |
f4f6fb71 | 876 | __acquires(htable->lock) |
1da177e4 LT |
877 | { |
878 | struct proc_dir_entry *pde = s->private; | |
39b46fc6 | 879 | struct xt_hashlimit_htable *htable = pde->data; |
1da177e4 LT |
880 | unsigned int *bucket; |
881 | ||
882 | spin_lock_bh(&htable->lock); | |
883 | if (*pos >= htable->cfg.size) | |
884 | return NULL; | |
885 | ||
886 | bucket = kmalloc(sizeof(unsigned int), GFP_ATOMIC); | |
887 | if (!bucket) | |
888 | return ERR_PTR(-ENOMEM); | |
889 | ||
890 | *bucket = *pos; | |
891 | return bucket; | |
892 | } | |
893 | ||
894 | static void *dl_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
895 | { | |
896 | struct proc_dir_entry *pde = s->private; | |
39b46fc6 | 897 | struct xt_hashlimit_htable *htable = pde->data; |
1da177e4 LT |
898 | unsigned int *bucket = (unsigned int *)v; |
899 | ||
900 | *pos = ++(*bucket); | |
901 | if (*pos >= htable->cfg.size) { | |
902 | kfree(v); | |
903 | return NULL; | |
904 | } | |
905 | return bucket; | |
906 | } | |
907 | ||
908 | static void dl_seq_stop(struct seq_file *s, void *v) | |
f4f6fb71 | 909 | __releases(htable->lock) |
1da177e4 LT |
910 | { |
911 | struct proc_dir_entry *pde = s->private; | |
39b46fc6 | 912 | struct xt_hashlimit_htable *htable = pde->data; |
1da177e4 LT |
913 | unsigned int *bucket = (unsigned int *)v; |
914 | ||
915 | kfree(bucket); | |
1da177e4 LT |
916 | spin_unlock_bh(&htable->lock); |
917 | } | |
918 | ||
39b46fc6 PM |
919 | static int dl_seq_real_show(struct dsthash_ent *ent, int family, |
920 | struct seq_file *s) | |
1da177e4 LT |
921 | { |
922 | /* recalculate to show accurate numbers */ | |
923 | rateinfo_recalc(ent, jiffies); | |
924 | ||
39b46fc6 PM |
925 | switch (family) { |
926 | case AF_INET: | |
927 | return seq_printf(s, "%ld %u.%u.%u.%u:%u->" | |
928 | "%u.%u.%u.%u:%u %u %u %u\n", | |
929 | (long)(ent->expires - jiffies)/HZ, | |
09e410de | 930 | NIPQUAD(ent->dst.ip.src), |
39b46fc6 | 931 | ntohs(ent->dst.src_port), |
09e410de | 932 | NIPQUAD(ent->dst.ip.dst), |
39b46fc6 PM |
933 | ntohs(ent->dst.dst_port), |
934 | ent->rateinfo.credit, ent->rateinfo.credit_cap, | |
935 | ent->rateinfo.cost); | |
7b21e09d | 936 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
39b46fc6 PM |
937 | case AF_INET6: |
938 | return seq_printf(s, "%ld " NIP6_FMT ":%u->" | |
939 | NIP6_FMT ":%u %u %u %u\n", | |
940 | (long)(ent->expires - jiffies)/HZ, | |
09e410de | 941 | NIP6(*(struct in6_addr *)&ent->dst.ip6.src), |
39b46fc6 | 942 | ntohs(ent->dst.src_port), |
09e410de | 943 | NIP6(*(struct in6_addr *)&ent->dst.ip6.dst), |
39b46fc6 PM |
944 | ntohs(ent->dst.dst_port), |
945 | ent->rateinfo.credit, ent->rateinfo.credit_cap, | |
946 | ent->rateinfo.cost); | |
7b21e09d | 947 | #endif |
39b46fc6 PM |
948 | default: |
949 | BUG(); | |
950 | return 0; | |
951 | } | |
1da177e4 LT |
952 | } |
953 | ||
954 | static int dl_seq_show(struct seq_file *s, void *v) | |
955 | { | |
956 | struct proc_dir_entry *pde = s->private; | |
39b46fc6 | 957 | struct xt_hashlimit_htable *htable = pde->data; |
1da177e4 LT |
958 | unsigned int *bucket = (unsigned int *)v; |
959 | struct dsthash_ent *ent; | |
960 | struct hlist_node *pos; | |
961 | ||
39b46fc6 PM |
962 | if (!hlist_empty(&htable->hash[*bucket])) { |
963 | hlist_for_each_entry(ent, pos, &htable->hash[*bucket], node) | |
964 | if (dl_seq_real_show(ent, htable->family, s)) | |
1da177e4 | 965 | return 1; |
39b46fc6 | 966 | } |
1da177e4 LT |
967 | return 0; |
968 | } | |
969 | ||
56b3d975 | 970 | static const struct seq_operations dl_seq_ops = { |
1da177e4 LT |
971 | .start = dl_seq_start, |
972 | .next = dl_seq_next, | |
973 | .stop = dl_seq_stop, | |
974 | .show = dl_seq_show | |
975 | }; | |
976 | ||
977 | static int dl_proc_open(struct inode *inode, struct file *file) | |
978 | { | |
979 | int ret = seq_open(file, &dl_seq_ops); | |
980 | ||
981 | if (!ret) { | |
982 | struct seq_file *sf = file->private_data; | |
983 | sf->private = PDE(inode); | |
984 | } | |
985 | return ret; | |
986 | } | |
987 | ||
da7071d7 | 988 | static const struct file_operations dl_file_ops = { |
1da177e4 LT |
989 | .owner = THIS_MODULE, |
990 | .open = dl_proc_open, | |
991 | .read = seq_read, | |
992 | .llseek = seq_lseek, | |
993 | .release = seq_release | |
994 | }; | |
995 | ||
d3c5ee6d | 996 | static int __init hashlimit_mt_init(void) |
1da177e4 | 997 | { |
39b46fc6 | 998 | int err; |
1da177e4 | 999 | |
d3c5ee6d JE |
1000 | err = xt_register_matches(hashlimit_mt_reg, |
1001 | ARRAY_SIZE(hashlimit_mt_reg)); | |
39b46fc6 PM |
1002 | if (err < 0) |
1003 | goto err1; | |
1da177e4 | 1004 | |
39b46fc6 PM |
1005 | err = -ENOMEM; |
1006 | hashlimit_cachep = kmem_cache_create("xt_hashlimit", | |
1007 | sizeof(struct dsthash_ent), 0, 0, | |
20c2df83 | 1008 | NULL); |
1da177e4 | 1009 | if (!hashlimit_cachep) { |
39b46fc6 PM |
1010 | printk(KERN_ERR "xt_hashlimit: unable to create slab cache\n"); |
1011 | goto err2; | |
1da177e4 | 1012 | } |
457c4cbc | 1013 | hashlimit_procdir4 = proc_mkdir("ipt_hashlimit", init_net.proc_net); |
39b46fc6 PM |
1014 | if (!hashlimit_procdir4) { |
1015 | printk(KERN_ERR "xt_hashlimit: unable to create proc dir " | |
1016 | "entry\n"); | |
1017 | goto err3; | |
1da177e4 | 1018 | } |
7b21e09d ED |
1019 | err = 0; |
1020 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) | |
457c4cbc | 1021 | hashlimit_procdir6 = proc_mkdir("ip6t_hashlimit", init_net.proc_net); |
39b46fc6 | 1022 | if (!hashlimit_procdir6) { |
9c2440bb | 1023 | printk(KERN_ERR "xt_hashlimit: unable to create proc dir " |
39b46fc6 | 1024 | "entry\n"); |
7b21e09d | 1025 | err = -ENOMEM; |
39b46fc6 | 1026 | } |
7b21e09d ED |
1027 | #endif |
1028 | if (!err) | |
1029 | return 0; | |
457c4cbc | 1030 | remove_proc_entry("ipt_hashlimit", init_net.proc_net); |
39b46fc6 | 1031 | err3: |
1da177e4 | 1032 | kmem_cache_destroy(hashlimit_cachep); |
39b46fc6 | 1033 | err2: |
d3c5ee6d | 1034 | xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); |
39b46fc6 PM |
1035 | err1: |
1036 | return err; | |
1da177e4 | 1037 | |
1da177e4 LT |
1038 | } |
1039 | ||
d3c5ee6d | 1040 | static void __exit hashlimit_mt_exit(void) |
1da177e4 | 1041 | { |
457c4cbc | 1042 | remove_proc_entry("ipt_hashlimit", init_net.proc_net); |
7b21e09d | 1043 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
457c4cbc | 1044 | remove_proc_entry("ip6t_hashlimit", init_net.proc_net); |
7b21e09d | 1045 | #endif |
39b46fc6 | 1046 | kmem_cache_destroy(hashlimit_cachep); |
d3c5ee6d | 1047 | xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); |
1da177e4 LT |
1048 | } |
1049 | ||
d3c5ee6d JE |
1050 | module_init(hashlimit_mt_init); |
1051 | module_exit(hashlimit_mt_exit); |