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Commit | Line | Data |
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404bdbfd PM |
1 | /* |
2 | * Copyright (c) 2006 Patrick McHardy <kaber@trash.net> | |
079aa88f | 3 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
404bdbfd PM |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This is a replacement of the old ipt_recent module, which carried the | |
10 | * following copyright notice: | |
11 | * | |
12 | * Author: Stephen Frost <sfrost@snowman.net> | |
13 | * Copyright 2002-2003, Stephen Frost, 2.5.x port by laforge@netfilter.org | |
14 | */ | |
8bee4bad | 15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
404bdbfd | 16 | #include <linux/init.h> |
6709dbbb | 17 | #include <linux/ip.h> |
079aa88f JE |
18 | #include <linux/ipv6.h> |
19 | #include <linux/module.h> | |
404bdbfd | 20 | #include <linux/moduleparam.h> |
1da177e4 | 21 | #include <linux/proc_fs.h> |
404bdbfd PM |
22 | #include <linux/seq_file.h> |
23 | #include <linux/string.h> | |
1da177e4 | 24 | #include <linux/ctype.h> |
404bdbfd PM |
25 | #include <linux/list.h> |
26 | #include <linux/random.h> | |
27 | #include <linux/jhash.h> | |
28 | #include <linux/bitops.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/inet.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
2727de76 | 32 | #include <linux/vmalloc.h> |
457c4cbc | 33 | #include <net/net_namespace.h> |
7d07d563 | 34 | #include <net/netns/generic.h> |
1da177e4 | 35 | |
6709dbbb | 36 | #include <linux/netfilter/x_tables.h> |
e948b20a | 37 | #include <linux/netfilter/xt_recent.h> |
1da177e4 | 38 | |
404bdbfd | 39 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
408ffaa4 | 40 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
06bf514e | 41 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching"); |
404bdbfd | 42 | MODULE_LICENSE("GPL"); |
e948b20a | 43 | MODULE_ALIAS("ipt_recent"); |
079aa88f | 44 | MODULE_ALIAS("ip6t_recent"); |
1da177e4 | 45 | |
abc86d0f FW |
46 | static unsigned int ip_list_tot __read_mostly = 100; |
47 | static unsigned int ip_list_hash_size __read_mostly; | |
48 | static unsigned int ip_list_perms __read_mostly = 0644; | |
49 | static unsigned int ip_list_uid __read_mostly; | |
50 | static unsigned int ip_list_gid __read_mostly; | |
e7be6994 | 51 | module_param(ip_list_tot, uint, 0400); |
e7be6994 PM |
52 | module_param(ip_list_hash_size, uint, 0400); |
53 | module_param(ip_list_perms, uint, 0400); | |
5dc7a6d5 JE |
54 | module_param(ip_list_uid, uint, S_IRUGO | S_IWUSR); |
55 | module_param(ip_list_gid, uint, S_IRUGO | S_IWUSR); | |
404bdbfd | 56 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
404bdbfd | 57 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); |
079aa88f | 58 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
5dc7a6d5 JE |
59 | MODULE_PARM_DESC(ip_list_uid, "default owner of /proc/net/xt_recent/* files"); |
60 | MODULE_PARM_DESC(ip_list_gid, "default owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 61 | |
abc86d0f FW |
62 | /* retained for backwards compatibility */ |
63 | static unsigned int ip_pkt_list_tot __read_mostly; | |
64 | module_param(ip_pkt_list_tot, uint, 0400); | |
65 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)"); | |
66 | ||
67 | #define XT_RECENT_MAX_NSTAMPS 256 | |
68 | ||
404bdbfd PM |
69 | struct recent_entry { |
70 | struct list_head list; | |
71 | struct list_head lru_list; | |
079aa88f JE |
72 | union nf_inet_addr addr; |
73 | u_int16_t family; | |
404bdbfd PM |
74 | u_int8_t ttl; |
75 | u_int8_t index; | |
76 | u_int16_t nstamps; | |
77 | unsigned long stamps[0]; | |
1da177e4 LT |
78 | }; |
79 | ||
404bdbfd PM |
80 | struct recent_table { |
81 | struct list_head list; | |
e948b20a | 82 | char name[XT_RECENT_NAME_LEN]; |
efdedd54 | 83 | union nf_inet_addr mask; |
404bdbfd PM |
84 | unsigned int refcnt; |
85 | unsigned int entries; | |
abc86d0f | 86 | u8 nstamps_max_mask; |
404bdbfd PM |
87 | struct list_head lru_list; |
88 | struct list_head iphash[0]; | |
1da177e4 LT |
89 | }; |
90 | ||
7d07d563 AD |
91 | struct recent_net { |
92 | struct list_head tables; | |
93 | #ifdef CONFIG_PROC_FS | |
94 | struct proc_dir_entry *xt_recent; | |
7d07d563 AD |
95 | #endif |
96 | }; | |
97 | ||
c7d03a00 | 98 | static unsigned int recent_net_id __read_mostly; |
abc86d0f | 99 | |
7d07d563 AD |
100 | static inline struct recent_net *recent_pernet(struct net *net) |
101 | { | |
102 | return net_generic(net, recent_net_id); | |
103 | } | |
104 | ||
1da177e4 | 105 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 106 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
107 | |
108 | #ifdef CONFIG_PROC_FS | |
079aa88f | 109 | static const struct file_operations recent_old_fops, recent_mt_fops; |
1da177e4 LT |
110 | #endif |
111 | ||
294188ae | 112 | static u_int32_t hash_rnd __read_mostly; |
079aa88f | 113 | |
294188ae | 114 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 115 | { |
079aa88f JE |
116 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
117 | (ip_list_hash_size - 1); | |
118 | } | |
1da177e4 | 119 | |
294188ae | 120 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 121 | { |
079aa88f JE |
122 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
123 | (ip_list_hash_size - 1); | |
1da177e4 LT |
124 | } |
125 | ||
404bdbfd | 126 | static struct recent_entry * |
079aa88f JE |
127 | recent_entry_lookup(const struct recent_table *table, |
128 | const union nf_inet_addr *addrp, u_int16_t family, | |
129 | u_int8_t ttl) | |
1da177e4 | 130 | { |
404bdbfd PM |
131 | struct recent_entry *e; |
132 | unsigned int h; | |
133 | ||
ee999d8b | 134 | if (family == NFPROTO_IPV4) |
079aa88f JE |
135 | h = recent_entry_hash4(addrp); |
136 | else | |
137 | h = recent_entry_hash6(addrp); | |
138 | ||
404bdbfd | 139 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
140 | if (e->family == family && |
141 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
142 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
143 | return e; |
144 | return NULL; | |
145 | } | |
1da177e4 | 146 | |
404bdbfd PM |
147 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
148 | { | |
149 | list_del(&e->list); | |
150 | list_del(&e->lru_list); | |
151 | kfree(e); | |
152 | t->entries--; | |
153 | } | |
1da177e4 | 154 | |
0079c5ae TG |
155 | /* |
156 | * Drop entries with timestamps older then 'time'. | |
157 | */ | |
158 | static void recent_entry_reap(struct recent_table *t, unsigned long time) | |
159 | { | |
160 | struct recent_entry *e; | |
161 | ||
162 | /* | |
163 | * The head of the LRU list is always the oldest entry. | |
164 | */ | |
165 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
166 | ||
167 | /* | |
168 | * The last time stamp is the most recent. | |
169 | */ | |
170 | if (time_after(time, e->stamps[e->index-1])) | |
171 | recent_entry_remove(t, e); | |
172 | } | |
173 | ||
404bdbfd | 174 | static struct recent_entry * |
079aa88f JE |
175 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
176 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
177 | { |
178 | struct recent_entry *e; | |
abc86d0f | 179 | unsigned int nstamps_max = t->nstamps_max_mask; |
1da177e4 | 180 | |
404bdbfd PM |
181 | if (t->entries >= ip_list_tot) { |
182 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
183 | recent_entry_remove(t, e); | |
1da177e4 | 184 | } |
abc86d0f FW |
185 | |
186 | nstamps_max += 1; | |
187 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * nstamps_max, | |
404bdbfd PM |
188 | GFP_ATOMIC); |
189 | if (e == NULL) | |
190 | return NULL; | |
079aa88f | 191 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
192 | e->ttl = ttl; |
193 | e->stamps[0] = jiffies; | |
194 | e->nstamps = 1; | |
195 | e->index = 1; | |
079aa88f | 196 | e->family = family; |
ee999d8b | 197 | if (family == NFPROTO_IPV4) |
079aa88f JE |
198 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
199 | else | |
200 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
201 | list_add_tail(&e->lru_list, &t->lru_list); |
202 | t->entries++; | |
203 | return e; | |
204 | } | |
1da177e4 | 205 | |
404bdbfd PM |
206 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
207 | { | |
abc86d0f | 208 | e->index &= t->nstamps_max_mask; |
404bdbfd PM |
209 | e->stamps[e->index++] = jiffies; |
210 | if (e->index > e->nstamps) | |
211 | e->nstamps = e->index; | |
404bdbfd PM |
212 | list_move_tail(&e->lru_list, &t->lru_list); |
213 | } | |
1da177e4 | 214 | |
7d07d563 AD |
215 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
216 | const char *name) | |
404bdbfd PM |
217 | { |
218 | struct recent_table *t; | |
1da177e4 | 219 | |
7d07d563 | 220 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
221 | if (!strcmp(t->name, name)) |
222 | return t; | |
223 | return NULL; | |
224 | } | |
1da177e4 | 225 | |
404bdbfd PM |
226 | static void recent_table_flush(struct recent_table *t) |
227 | { | |
228 | struct recent_entry *e, *next; | |
229 | unsigned int i; | |
1da177e4 | 230 | |
7c4e36bc | 231 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
232 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
233 | recent_entry_remove(t, e); | |
1da177e4 LT |
234 | } |
235 | ||
1d93a9cb | 236 | static bool |
62fc8051 | 237 | recent_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 238 | { |
613dbd95 | 239 | struct net *net = xt_net(par); |
7d07d563 | 240 | struct recent_net *recent_net = recent_pernet(net); |
efdedd54 | 241 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd PM |
242 | struct recent_table *t; |
243 | struct recent_entry *e; | |
efdedd54 | 244 | union nf_inet_addr addr = {}, addr_mask; |
404bdbfd | 245 | u_int8_t ttl; |
1d93a9cb | 246 | bool ret = info->invert; |
1da177e4 | 247 | |
613dbd95 | 248 | if (xt_family(par) == NFPROTO_IPV4) { |
079aa88f JE |
249 | const struct iphdr *iph = ip_hdr(skb); |
250 | ||
251 | if (info->side == XT_RECENT_DEST) | |
252 | addr.ip = iph->daddr; | |
253 | else | |
254 | addr.ip = iph->saddr; | |
255 | ||
256 | ttl = iph->ttl; | |
257 | } else { | |
258 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
259 | ||
260 | if (info->side == XT_RECENT_DEST) | |
261 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
262 | else | |
263 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
264 | ||
265 | ttl = iph->hop_limit; | |
266 | } | |
1da177e4 | 267 | |
404bdbfd | 268 | /* use TTL as seen before forwarding */ |
613dbd95 | 269 | if (xt_out(par) != NULL && skb->sk == NULL) |
404bdbfd | 270 | ttl++; |
1da177e4 | 271 | |
1da177e4 | 272 | spin_lock_bh(&recent_lock); |
7d07d563 | 273 | t = recent_table_lookup(recent_net, info->name); |
efdedd54 DF |
274 | |
275 | nf_inet_addr_mask(&addr, &addr_mask, &t->mask); | |
276 | ||
613dbd95 | 277 | e = recent_entry_lookup(t, &addr_mask, xt_family(par), |
079aa88f | 278 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 279 | if (e == NULL) { |
e948b20a | 280 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 281 | goto out; |
613dbd95 | 282 | e = recent_entry_init(t, &addr_mask, xt_family(par), ttl); |
404bdbfd | 283 | if (e == NULL) |
b4ba2611 | 284 | par->hotdrop = true; |
1d93a9cb | 285 | ret = !ret; |
404bdbfd | 286 | goto out; |
1da177e4 LT |
287 | } |
288 | ||
e948b20a | 289 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 290 | ret = !ret; |
e948b20a | 291 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 292 | recent_entry_remove(t, e); |
1d93a9cb | 293 | ret = !ret; |
e948b20a | 294 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 295 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
296 | unsigned int i, hits = 0; |
297 | ||
298 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 299 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd | 300 | continue; |
ef169150 | 301 | if (!info->hit_count || ++hits >= info->hit_count) { |
1d93a9cb | 302 | ret = !ret; |
404bdbfd | 303 | break; |
1da177e4 | 304 | } |
1da177e4 | 305 | } |
0079c5ae TG |
306 | |
307 | /* info->seconds must be non-zero */ | |
308 | if (info->check_set & XT_RECENT_REAP) | |
309 | recent_entry_reap(t, time); | |
1da177e4 LT |
310 | } |
311 | ||
e948b20a JE |
312 | if (info->check_set & XT_RECENT_SET || |
313 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
314 | recent_entry_update(t, e); |
315 | e->ttl = ttl; | |
316 | } | |
317 | out: | |
318 | spin_unlock_bh(&recent_lock); | |
319 | return ret; | |
1da177e4 LT |
320 | } |
321 | ||
2727de76 ED |
322 | static void recent_table_free(void *addr) |
323 | { | |
4cb28970 | 324 | kvfree(addr); |
2727de76 ED |
325 | } |
326 | ||
efdedd54 DF |
327 | static int recent_mt_check(const struct xt_mtchk_param *par, |
328 | const struct xt_recent_mtinfo_v1 *info) | |
1da177e4 | 329 | { |
7d07d563 | 330 | struct recent_net *recent_net = recent_pernet(par->net); |
404bdbfd | 331 | struct recent_table *t; |
b0ceb560 AD |
332 | #ifdef CONFIG_PROC_FS |
333 | struct proc_dir_entry *pde; | |
da742808 EB |
334 | kuid_t uid; |
335 | kgid_t gid; | |
b0ceb560 | 336 | #endif |
abc86d0f | 337 | unsigned int nstamp_mask; |
95c96174 | 338 | unsigned int i; |
bd414ee6 | 339 | int ret = -EINVAL; |
2727de76 | 340 | size_t sz; |
1da177e4 | 341 | |
7bdc6624 GF |
342 | net_get_random_once(&hash_rnd, sizeof(hash_rnd)); |
343 | ||
606a9a02 | 344 | if (info->check_set & ~XT_RECENT_VALID_FLAGS) { |
ff67e4e4 JE |
345 | pr_info("Unsupported user space flags (%08x)\n", |
346 | info->check_set); | |
bd414ee6 | 347 | return -EINVAL; |
606a9a02 | 348 | } |
404bdbfd | 349 | if (hweight8(info->check_set & |
e948b20a JE |
350 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
351 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
bd414ee6 | 352 | return -EINVAL; |
e948b20a | 353 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
0079c5ae TG |
354 | (info->seconds || info->hit_count || |
355 | (info->check_set & XT_RECENT_MODIFIERS))) | |
bd414ee6 | 356 | return -EINVAL; |
0079c5ae | 357 | if ((info->check_set & XT_RECENT_REAP) && !info->seconds) |
bd414ee6 | 358 | return -EINVAL; |
abc86d0f FW |
359 | if (info->hit_count >= XT_RECENT_MAX_NSTAMPS) { |
360 | pr_info("hitcount (%u) is larger than allowed maximum (%u)\n", | |
361 | info->hit_count, XT_RECENT_MAX_NSTAMPS - 1); | |
bd414ee6 | 362 | return -EINVAL; |
98e6d2d5 | 363 | } |
404bdbfd | 364 | if (info->name[0] == '\0' || |
e948b20a | 365 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
bd414ee6 | 366 | return -EINVAL; |
1da177e4 | 367 | |
abc86d0f FW |
368 | if (ip_pkt_list_tot && info->hit_count < ip_pkt_list_tot) |
369 | nstamp_mask = roundup_pow_of_two(ip_pkt_list_tot) - 1; | |
370 | else if (info->hit_count) | |
371 | nstamp_mask = roundup_pow_of_two(info->hit_count) - 1; | |
372 | else | |
373 | nstamp_mask = 32 - 1; | |
374 | ||
a0e889bb | 375 | mutex_lock(&recent_mutex); |
7d07d563 | 376 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 377 | if (t != NULL) { |
cef9ed86 FW |
378 | if (nstamp_mask > t->nstamps_max_mask) { |
379 | spin_lock_bh(&recent_lock); | |
380 | recent_table_flush(t); | |
381 | t->nstamps_max_mask = nstamp_mask; | |
382 | spin_unlock_bh(&recent_lock); | |
abc86d0f FW |
383 | } |
384 | ||
404bdbfd | 385 | t->refcnt++; |
bd414ee6 | 386 | ret = 0; |
404bdbfd | 387 | goto out; |
1da177e4 LT |
388 | } |
389 | ||
2727de76 | 390 | sz = sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size; |
752ade68 | 391 | t = kvzalloc(sz, GFP_KERNEL); |
4a5a5c73 JE |
392 | if (t == NULL) { |
393 | ret = -ENOMEM; | |
404bdbfd | 394 | goto out; |
4a5a5c73 | 395 | } |
2b2283d0 | 396 | t->refcnt = 1; |
abc86d0f | 397 | t->nstamps_max_mask = nstamp_mask; |
efdedd54 DF |
398 | |
399 | memcpy(&t->mask, &info->mask, sizeof(t->mask)); | |
404bdbfd PM |
400 | strcpy(t->name, info->name); |
401 | INIT_LIST_HEAD(&t->lru_list); | |
402 | for (i = 0; i < ip_list_hash_size; i++) | |
403 | INIT_LIST_HEAD(&t->iphash[i]); | |
404 | #ifdef CONFIG_PROC_FS | |
da742808 EB |
405 | uid = make_kuid(&init_user_ns, ip_list_uid); |
406 | gid = make_kgid(&init_user_ns, ip_list_gid); | |
407 | if (!uid_valid(uid) || !gid_valid(gid)) { | |
2727de76 | 408 | recent_table_free(t); |
da742808 EB |
409 | ret = -EINVAL; |
410 | goto out; | |
411 | } | |
7d07d563 | 412 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 413 | &recent_mt_fops, t); |
b0ceb560 | 414 | if (pde == NULL) { |
2727de76 | 415 | recent_table_free(t); |
4a5a5c73 | 416 | ret = -ENOMEM; |
404bdbfd | 417 | goto out; |
1da177e4 | 418 | } |
271a15ea | 419 | proc_set_user(pde, uid, gid); |
1da177e4 | 420 | #endif |
a0e889bb | 421 | spin_lock_bh(&recent_lock); |
7d07d563 | 422 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 423 | spin_unlock_bh(&recent_lock); |
bd414ee6 | 424 | ret = 0; |
404bdbfd | 425 | out: |
a0e889bb | 426 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
427 | return ret; |
428 | } | |
1da177e4 | 429 | |
efdedd54 DF |
430 | static int recent_mt_check_v0(const struct xt_mtchk_param *par) |
431 | { | |
432 | const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo; | |
433 | struct xt_recent_mtinfo_v1 info_v1; | |
434 | ||
435 | /* Copy revision 0 structure to revision 1 */ | |
436 | memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo)); | |
437 | /* Set default mask to ensure backward compatible behaviour */ | |
438 | memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all)); | |
439 | ||
440 | return recent_mt_check(par, &info_v1); | |
441 | } | |
442 | ||
443 | static int recent_mt_check_v1(const struct xt_mtchk_param *par) | |
444 | { | |
445 | return recent_mt_check(par, par->matchinfo); | |
446 | } | |
447 | ||
6be3d859 | 448 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 449 | { |
7d07d563 | 450 | struct recent_net *recent_net = recent_pernet(par->net); |
efdedd54 | 451 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd | 452 | struct recent_table *t; |
1da177e4 | 453 | |
a0e889bb | 454 | mutex_lock(&recent_mutex); |
7d07d563 | 455 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 456 | if (--t->refcnt == 0) { |
a0e889bb | 457 | spin_lock_bh(&recent_lock); |
404bdbfd | 458 | list_del(&t->list); |
a0e889bb | 459 | spin_unlock_bh(&recent_lock); |
404bdbfd | 460 | #ifdef CONFIG_PROC_FS |
665e205c VL |
461 | if (recent_net->xt_recent != NULL) |
462 | remove_proc_entry(t->name, recent_net->xt_recent); | |
1da177e4 | 463 | #endif |
a8ddc916 | 464 | recent_table_flush(t); |
2727de76 | 465 | recent_table_free(t); |
1da177e4 | 466 | } |
a0e889bb | 467 | mutex_unlock(&recent_mutex); |
404bdbfd | 468 | } |
1da177e4 | 469 | |
404bdbfd PM |
470 | #ifdef CONFIG_PROC_FS |
471 | struct recent_iter_state { | |
079aa88f | 472 | const struct recent_table *table; |
404bdbfd PM |
473 | unsigned int bucket; |
474 | }; | |
1da177e4 | 475 | |
404bdbfd | 476 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 477 | __acquires(recent_lock) |
404bdbfd PM |
478 | { |
479 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 480 | const struct recent_table *t = st->table; |
404bdbfd PM |
481 | struct recent_entry *e; |
482 | loff_t p = *pos; | |
1da177e4 | 483 | |
1da177e4 | 484 | spin_lock_bh(&recent_lock); |
1da177e4 | 485 | |
7c4e36bc JE |
486 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
487 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
488 | if (p-- == 0) |
489 | return e; | |
404bdbfd PM |
490 | return NULL; |
491 | } | |
1da177e4 | 492 | |
404bdbfd PM |
493 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
494 | { | |
495 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 496 | const struct recent_table *t = st->table; |
079aa88f JE |
497 | const struct recent_entry *e = v; |
498 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
499 | |
500 | while (head == &t->iphash[st->bucket]) { | |
501 | if (++st->bucket >= ip_list_hash_size) | |
502 | return NULL; | |
503 | head = t->iphash[st->bucket].next; | |
504 | } | |
505 | (*pos)++; | |
506 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
507 | } |
508 | ||
404bdbfd | 509 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 510 | __releases(recent_lock) |
1da177e4 | 511 | { |
404bdbfd PM |
512 | spin_unlock_bh(&recent_lock); |
513 | } | |
1da177e4 | 514 | |
404bdbfd PM |
515 | static int recent_seq_show(struct seq_file *seq, void *v) |
516 | { | |
3cf93c96 | 517 | const struct recent_entry *e = v; |
abc86d0f FW |
518 | struct recent_iter_state *st = seq->private; |
519 | const struct recent_table *t = st->table; | |
404bdbfd PM |
520 | unsigned int i; |
521 | ||
abc86d0f FW |
522 | i = (e->index - 1) & t->nstamps_max_mask; |
523 | ||
ee999d8b | 524 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
525 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
526 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 527 | else |
5b095d98 | 528 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 529 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
530 | for (i = 0; i < e->nstamps; i++) |
531 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
cdec2685 | 532 | seq_putc(seq, '\n'); |
404bdbfd PM |
533 | return 0; |
534 | } | |
1da177e4 | 535 | |
56b3d975 | 536 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
537 | .start = recent_seq_start, |
538 | .next = recent_seq_next, | |
539 | .stop = recent_seq_stop, | |
540 | .show = recent_seq_show, | |
541 | }; | |
1da177e4 | 542 | |
404bdbfd PM |
543 | static int recent_seq_open(struct inode *inode, struct file *file) |
544 | { | |
404bdbfd | 545 | struct recent_iter_state *st; |
404bdbfd | 546 | |
e2da5913 | 547 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
548 | if (st == NULL) |
549 | return -ENOMEM; | |
3af8e31c | 550 | |
d9dda78b | 551 | st->table = PDE_DATA(inode); |
e2da5913 | 552 | return 0; |
404bdbfd | 553 | } |
1da177e4 | 554 | |
079aa88f JE |
555 | static ssize_t |
556 | recent_mt_proc_write(struct file *file, const char __user *input, | |
557 | size_t size, loff_t *loff) | |
558 | { | |
d9dda78b | 559 | struct recent_table *t = PDE_DATA(file_inode(file)); |
079aa88f JE |
560 | struct recent_entry *e; |
561 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
562 | const char *c = buf; | |
325fb5b4 | 563 | union nf_inet_addr addr = {}; |
079aa88f JE |
564 | u_int16_t family; |
565 | bool add, succ; | |
566 | ||
567 | if (size == 0) | |
568 | return 0; | |
569 | if (size > sizeof(buf)) | |
570 | size = sizeof(buf); | |
571 | if (copy_from_user(buf, input, size) != 0) | |
572 | return -EFAULT; | |
573 | ||
574 | /* Strict protocol! */ | |
575 | if (*loff != 0) | |
576 | return -ESPIPE; | |
577 | switch (*c) { | |
578 | case '/': /* flush table */ | |
579 | spin_lock_bh(&recent_lock); | |
580 | recent_table_flush(t); | |
581 | spin_unlock_bh(&recent_lock); | |
582 | return size; | |
583 | case '-': /* remove address */ | |
584 | add = false; | |
585 | break; | |
586 | case '+': /* add address */ | |
587 | add = true; | |
588 | break; | |
589 | default: | |
8bee4bad | 590 | pr_info("Need \"+ip\", \"-ip\" or \"/\"\n"); |
079aa88f JE |
591 | return -EINVAL; |
592 | } | |
593 | ||
594 | ++c; | |
595 | --size; | |
596 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 597 | family = NFPROTO_IPV6; |
079aa88f JE |
598 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
599 | } else { | |
ee999d8b | 600 | family = NFPROTO_IPV4; |
079aa88f JE |
601 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
602 | } | |
603 | ||
604 | if (!succ) { | |
8bee4bad | 605 | pr_info("illegal address written to procfs\n"); |
079aa88f JE |
606 | return -EINVAL; |
607 | } | |
608 | ||
609 | spin_lock_bh(&recent_lock); | |
610 | e = recent_entry_lookup(t, &addr, family, 0); | |
611 | if (e == NULL) { | |
612 | if (add) | |
613 | recent_entry_init(t, &addr, family, 0); | |
614 | } else { | |
615 | if (add) | |
616 | recent_entry_update(t, e); | |
617 | else | |
618 | recent_entry_remove(t, e); | |
619 | } | |
620 | spin_unlock_bh(&recent_lock); | |
621 | /* Note we removed one above */ | |
622 | *loff += size + 1; | |
623 | return size + 1; | |
624 | } | |
625 | ||
626 | static const struct file_operations recent_mt_fops = { | |
627 | .open = recent_seq_open, | |
628 | .read = seq_read, | |
629 | .write = recent_mt_proc_write, | |
630 | .release = seq_release_private, | |
631 | .owner = THIS_MODULE, | |
6038f373 | 632 | .llseek = seq_lseek, |
079aa88f | 633 | }; |
7d07d563 AD |
634 | |
635 | static int __net_init recent_proc_net_init(struct net *net) | |
636 | { | |
637 | struct recent_net *recent_net = recent_pernet(net); | |
638 | ||
639 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
640 | if (!recent_net->xt_recent) | |
641 | return -ENOMEM; | |
7d07d563 AD |
642 | return 0; |
643 | } | |
644 | ||
645 | static void __net_exit recent_proc_net_exit(struct net *net) | |
646 | { | |
665e205c VL |
647 | struct recent_net *recent_net = recent_pernet(net); |
648 | struct recent_table *t; | |
649 | ||
650 | /* recent_net_exit() is called before recent_mt_destroy(). Make sure | |
651 | * that the parent xt_recent proc entry is is empty before trying to | |
652 | * remove it. | |
653 | */ | |
654 | spin_lock_bh(&recent_lock); | |
655 | list_for_each_entry(t, &recent_net->tables, list) | |
656 | remove_proc_entry(t->name, recent_net->xt_recent); | |
657 | ||
658 | recent_net->xt_recent = NULL; | |
659 | spin_unlock_bh(&recent_lock); | |
660 | ||
ece31ffd | 661 | remove_proc_entry("xt_recent", net->proc_net); |
7d07d563 AD |
662 | } |
663 | #else | |
664 | static inline int recent_proc_net_init(struct net *net) | |
665 | { | |
666 | return 0; | |
667 | } | |
668 | ||
669 | static inline void recent_proc_net_exit(struct net *net) | |
670 | { | |
671 | } | |
1da177e4 | 672 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 673 | |
7d07d563 AD |
674 | static int __net_init recent_net_init(struct net *net) |
675 | { | |
676 | struct recent_net *recent_net = recent_pernet(net); | |
677 | ||
678 | INIT_LIST_HEAD(&recent_net->tables); | |
679 | return recent_proc_net_init(net); | |
680 | } | |
681 | ||
682 | static void __net_exit recent_net_exit(struct net *net) | |
683 | { | |
7d07d563 AD |
684 | recent_proc_net_exit(net); |
685 | } | |
686 | ||
687 | static struct pernet_operations recent_net_ops = { | |
688 | .init = recent_net_init, | |
689 | .exit = recent_net_exit, | |
690 | .id = &recent_net_id, | |
691 | .size = sizeof(struct recent_net), | |
692 | }; | |
693 | ||
079aa88f JE |
694 | static struct xt_match recent_mt_reg[] __read_mostly = { |
695 | { | |
696 | .name = "recent", | |
697 | .revision = 0, | |
ee999d8b | 698 | .family = NFPROTO_IPV4, |
079aa88f JE |
699 | .match = recent_mt, |
700 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 | 701 | .checkentry = recent_mt_check_v0, |
079aa88f JE |
702 | .destroy = recent_mt_destroy, |
703 | .me = THIS_MODULE, | |
704 | }, | |
705 | { | |
706 | .name = "recent", | |
707 | .revision = 0, | |
ee999d8b | 708 | .family = NFPROTO_IPV6, |
079aa88f JE |
709 | .match = recent_mt, |
710 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 DF |
711 | .checkentry = recent_mt_check_v0, |
712 | .destroy = recent_mt_destroy, | |
713 | .me = THIS_MODULE, | |
714 | }, | |
715 | { | |
716 | .name = "recent", | |
717 | .revision = 1, | |
718 | .family = NFPROTO_IPV4, | |
719 | .match = recent_mt, | |
720 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
721 | .checkentry = recent_mt_check_v1, | |
079aa88f JE |
722 | .destroy = recent_mt_destroy, |
723 | .me = THIS_MODULE, | |
724 | }, | |
efdedd54 DF |
725 | { |
726 | .name = "recent", | |
727 | .revision = 1, | |
728 | .family = NFPROTO_IPV6, | |
729 | .match = recent_mt, | |
730 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
731 | .checkentry = recent_mt_check_v1, | |
732 | .destroy = recent_mt_destroy, | |
733 | .me = THIS_MODULE, | |
734 | } | |
1da177e4 LT |
735 | }; |
736 | ||
d3c5ee6d | 737 | static int __init recent_mt_init(void) |
1da177e4 | 738 | { |
404bdbfd | 739 | int err; |
1da177e4 | 740 | |
abc86d0f FW |
741 | BUILD_BUG_ON_NOT_POWER_OF_2(XT_RECENT_MAX_NSTAMPS); |
742 | ||
743 | if (!ip_list_tot || ip_pkt_list_tot >= XT_RECENT_MAX_NSTAMPS) | |
404bdbfd PM |
744 | return -EINVAL; |
745 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 746 | |
7d07d563 | 747 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 748 | if (err) |
404bdbfd | 749 | return err; |
7d07d563 AD |
750 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
751 | if (err) | |
752 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
753 | return err; |
754 | } | |
755 | ||
d3c5ee6d | 756 | static void __exit recent_mt_exit(void) |
1da177e4 | 757 | { |
079aa88f | 758 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 759 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
760 | } |
761 | ||
d3c5ee6d JE |
762 | module_init(recent_mt_init); |
763 | module_exit(recent_mt_exit); |