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> |
457c4cbc | 32 | #include <net/net_namespace.h> |
7d07d563 | 33 | #include <net/netns/generic.h> |
1da177e4 | 34 | |
6709dbbb | 35 | #include <linux/netfilter/x_tables.h> |
e948b20a | 36 | #include <linux/netfilter/xt_recent.h> |
1da177e4 | 37 | |
404bdbfd | 38 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
408ffaa4 | 39 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
06bf514e | 40 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching"); |
404bdbfd | 41 | MODULE_LICENSE("GPL"); |
e948b20a | 42 | MODULE_ALIAS("ipt_recent"); |
079aa88f | 43 | MODULE_ALIAS("ip6t_recent"); |
1da177e4 | 44 | |
e7be6994 PM |
45 | static unsigned int ip_list_tot = 100; |
46 | static unsigned int ip_pkt_list_tot = 20; | |
47 | static unsigned int ip_list_hash_size = 0; | |
48 | static unsigned int ip_list_perms = 0644; | |
b93ff783 DDG |
49 | static unsigned int ip_list_uid = 0; |
50 | static unsigned int ip_list_gid = 0; | |
e7be6994 PM |
51 | module_param(ip_list_tot, uint, 0400); |
52 | module_param(ip_pkt_list_tot, uint, 0400); | |
53 | module_param(ip_list_hash_size, uint, 0400); | |
54 | module_param(ip_list_perms, uint, 0400); | |
5dc7a6d5 JE |
55 | module_param(ip_list_uid, uint, S_IRUGO | S_IWUSR); |
56 | module_param(ip_list_gid, uint, S_IRUGO | S_IWUSR); | |
404bdbfd | 57 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
98e6d2d5 | 58 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)"); |
404bdbfd | 59 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); |
079aa88f | 60 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
5dc7a6d5 JE |
61 | MODULE_PARM_DESC(ip_list_uid, "default owner of /proc/net/xt_recent/* files"); |
62 | MODULE_PARM_DESC(ip_list_gid, "default owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 63 | |
404bdbfd PM |
64 | struct recent_entry { |
65 | struct list_head list; | |
66 | struct list_head lru_list; | |
079aa88f JE |
67 | union nf_inet_addr addr; |
68 | u_int16_t family; | |
404bdbfd PM |
69 | u_int8_t ttl; |
70 | u_int8_t index; | |
71 | u_int16_t nstamps; | |
72 | unsigned long stamps[0]; | |
1da177e4 LT |
73 | }; |
74 | ||
404bdbfd PM |
75 | struct recent_table { |
76 | struct list_head list; | |
e948b20a | 77 | char name[XT_RECENT_NAME_LEN]; |
efdedd54 | 78 | union nf_inet_addr mask; |
404bdbfd PM |
79 | unsigned int refcnt; |
80 | unsigned int entries; | |
81 | struct list_head lru_list; | |
82 | struct list_head iphash[0]; | |
1da177e4 LT |
83 | }; |
84 | ||
7d07d563 AD |
85 | struct recent_net { |
86 | struct list_head tables; | |
87 | #ifdef CONFIG_PROC_FS | |
88 | struct proc_dir_entry *xt_recent; | |
7d07d563 AD |
89 | #endif |
90 | }; | |
91 | ||
92 | static int recent_net_id; | |
93 | static inline struct recent_net *recent_pernet(struct net *net) | |
94 | { | |
95 | return net_generic(net, recent_net_id); | |
96 | } | |
97 | ||
1da177e4 | 98 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 99 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
100 | |
101 | #ifdef CONFIG_PROC_FS | |
079aa88f | 102 | static const struct file_operations recent_old_fops, recent_mt_fops; |
1da177e4 LT |
103 | #endif |
104 | ||
294188ae JE |
105 | static u_int32_t hash_rnd __read_mostly; |
106 | static bool hash_rnd_inited __read_mostly; | |
079aa88f | 107 | |
294188ae | 108 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 109 | { |
079aa88f JE |
110 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
111 | (ip_list_hash_size - 1); | |
112 | } | |
1da177e4 | 113 | |
294188ae | 114 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 115 | { |
079aa88f JE |
116 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
117 | (ip_list_hash_size - 1); | |
1da177e4 LT |
118 | } |
119 | ||
404bdbfd | 120 | static struct recent_entry * |
079aa88f JE |
121 | recent_entry_lookup(const struct recent_table *table, |
122 | const union nf_inet_addr *addrp, u_int16_t family, | |
123 | u_int8_t ttl) | |
1da177e4 | 124 | { |
404bdbfd PM |
125 | struct recent_entry *e; |
126 | unsigned int h; | |
127 | ||
ee999d8b | 128 | if (family == NFPROTO_IPV4) |
079aa88f JE |
129 | h = recent_entry_hash4(addrp); |
130 | else | |
131 | h = recent_entry_hash6(addrp); | |
132 | ||
404bdbfd | 133 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
134 | if (e->family == family && |
135 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
136 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
137 | return e; |
138 | return NULL; | |
139 | } | |
1da177e4 | 140 | |
404bdbfd PM |
141 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
142 | { | |
143 | list_del(&e->list); | |
144 | list_del(&e->lru_list); | |
145 | kfree(e); | |
146 | t->entries--; | |
147 | } | |
1da177e4 | 148 | |
0079c5ae TG |
149 | /* |
150 | * Drop entries with timestamps older then 'time'. | |
151 | */ | |
152 | static void recent_entry_reap(struct recent_table *t, unsigned long time) | |
153 | { | |
154 | struct recent_entry *e; | |
155 | ||
156 | /* | |
157 | * The head of the LRU list is always the oldest entry. | |
158 | */ | |
159 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
160 | ||
161 | /* | |
162 | * The last time stamp is the most recent. | |
163 | */ | |
164 | if (time_after(time, e->stamps[e->index-1])) | |
165 | recent_entry_remove(t, e); | |
166 | } | |
167 | ||
404bdbfd | 168 | static struct recent_entry * |
079aa88f JE |
169 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
170 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
171 | { |
172 | struct recent_entry *e; | |
1da177e4 | 173 | |
404bdbfd PM |
174 | if (t->entries >= ip_list_tot) { |
175 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
176 | recent_entry_remove(t, e); | |
1da177e4 | 177 | } |
404bdbfd PM |
178 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
179 | GFP_ATOMIC); | |
180 | if (e == NULL) | |
181 | return NULL; | |
079aa88f | 182 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
183 | e->ttl = ttl; |
184 | e->stamps[0] = jiffies; | |
185 | e->nstamps = 1; | |
186 | e->index = 1; | |
079aa88f | 187 | e->family = family; |
ee999d8b | 188 | if (family == NFPROTO_IPV4) |
079aa88f JE |
189 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
190 | else | |
191 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
192 | list_add_tail(&e->lru_list, &t->lru_list); |
193 | t->entries++; | |
194 | return e; | |
195 | } | |
1da177e4 | 196 | |
404bdbfd PM |
197 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
198 | { | |
2c08522e | 199 | e->index %= ip_pkt_list_tot; |
404bdbfd PM |
200 | e->stamps[e->index++] = jiffies; |
201 | if (e->index > e->nstamps) | |
202 | e->nstamps = e->index; | |
404bdbfd PM |
203 | list_move_tail(&e->lru_list, &t->lru_list); |
204 | } | |
1da177e4 | 205 | |
7d07d563 AD |
206 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
207 | const char *name) | |
404bdbfd PM |
208 | { |
209 | struct recent_table *t; | |
1da177e4 | 210 | |
7d07d563 | 211 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
212 | if (!strcmp(t->name, name)) |
213 | return t; | |
214 | return NULL; | |
215 | } | |
1da177e4 | 216 | |
404bdbfd PM |
217 | static void recent_table_flush(struct recent_table *t) |
218 | { | |
219 | struct recent_entry *e, *next; | |
220 | unsigned int i; | |
1da177e4 | 221 | |
7c4e36bc | 222 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
223 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
224 | recent_entry_remove(t, e); | |
1da177e4 LT |
225 | } |
226 | ||
1d93a9cb | 227 | static bool |
62fc8051 | 228 | recent_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 229 | { |
7d07d563 AD |
230 | struct net *net = dev_net(par->in ? par->in : par->out); |
231 | struct recent_net *recent_net = recent_pernet(net); | |
efdedd54 | 232 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd PM |
233 | struct recent_table *t; |
234 | struct recent_entry *e; | |
efdedd54 | 235 | union nf_inet_addr addr = {}, addr_mask; |
404bdbfd | 236 | u_int8_t ttl; |
1d93a9cb | 237 | bool ret = info->invert; |
1da177e4 | 238 | |
aa5fa318 | 239 | if (par->family == NFPROTO_IPV4) { |
079aa88f JE |
240 | const struct iphdr *iph = ip_hdr(skb); |
241 | ||
242 | if (info->side == XT_RECENT_DEST) | |
243 | addr.ip = iph->daddr; | |
244 | else | |
245 | addr.ip = iph->saddr; | |
246 | ||
247 | ttl = iph->ttl; | |
248 | } else { | |
249 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
250 | ||
251 | if (info->side == XT_RECENT_DEST) | |
252 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
253 | else | |
254 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
255 | ||
256 | ttl = iph->hop_limit; | |
257 | } | |
1da177e4 | 258 | |
404bdbfd | 259 | /* use TTL as seen before forwarding */ |
f7108a20 | 260 | if (par->out != NULL && skb->sk == NULL) |
404bdbfd | 261 | ttl++; |
1da177e4 | 262 | |
1da177e4 | 263 | spin_lock_bh(&recent_lock); |
7d07d563 | 264 | t = recent_table_lookup(recent_net, info->name); |
efdedd54 DF |
265 | |
266 | nf_inet_addr_mask(&addr, &addr_mask, &t->mask); | |
267 | ||
268 | e = recent_entry_lookup(t, &addr_mask, par->family, | |
079aa88f | 269 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 270 | if (e == NULL) { |
e948b20a | 271 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 272 | goto out; |
efdedd54 | 273 | e = recent_entry_init(t, &addr_mask, par->family, ttl); |
404bdbfd | 274 | if (e == NULL) |
b4ba2611 | 275 | par->hotdrop = true; |
1d93a9cb | 276 | ret = !ret; |
404bdbfd | 277 | goto out; |
1da177e4 LT |
278 | } |
279 | ||
e948b20a | 280 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 281 | ret = !ret; |
e948b20a | 282 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 283 | recent_entry_remove(t, e); |
1d93a9cb | 284 | ret = !ret; |
e948b20a | 285 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 286 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
287 | unsigned int i, hits = 0; |
288 | ||
289 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 290 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd | 291 | continue; |
ef169150 | 292 | if (!info->hit_count || ++hits >= info->hit_count) { |
1d93a9cb | 293 | ret = !ret; |
404bdbfd | 294 | break; |
1da177e4 | 295 | } |
1da177e4 | 296 | } |
0079c5ae TG |
297 | |
298 | /* info->seconds must be non-zero */ | |
299 | if (info->check_set & XT_RECENT_REAP) | |
300 | recent_entry_reap(t, time); | |
1da177e4 LT |
301 | } |
302 | ||
e948b20a JE |
303 | if (info->check_set & XT_RECENT_SET || |
304 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
305 | recent_entry_update(t, e); |
306 | e->ttl = ttl; | |
307 | } | |
308 | out: | |
309 | spin_unlock_bh(&recent_lock); | |
310 | return ret; | |
1da177e4 LT |
311 | } |
312 | ||
efdedd54 DF |
313 | static int recent_mt_check(const struct xt_mtchk_param *par, |
314 | const struct xt_recent_mtinfo_v1 *info) | |
1da177e4 | 315 | { |
7d07d563 | 316 | struct recent_net *recent_net = recent_pernet(par->net); |
404bdbfd | 317 | struct recent_table *t; |
b0ceb560 AD |
318 | #ifdef CONFIG_PROC_FS |
319 | struct proc_dir_entry *pde; | |
320 | #endif | |
95c96174 | 321 | unsigned int i; |
bd414ee6 | 322 | int ret = -EINVAL; |
1da177e4 | 323 | |
294188ae JE |
324 | if (unlikely(!hash_rnd_inited)) { |
325 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
326 | hash_rnd_inited = true; | |
327 | } | |
606a9a02 | 328 | if (info->check_set & ~XT_RECENT_VALID_FLAGS) { |
ff67e4e4 JE |
329 | pr_info("Unsupported user space flags (%08x)\n", |
330 | info->check_set); | |
bd414ee6 | 331 | return -EINVAL; |
606a9a02 | 332 | } |
404bdbfd | 333 | if (hweight8(info->check_set & |
e948b20a JE |
334 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
335 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
bd414ee6 | 336 | return -EINVAL; |
e948b20a | 337 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
0079c5ae TG |
338 | (info->seconds || info->hit_count || |
339 | (info->check_set & XT_RECENT_MODIFIERS))) | |
bd414ee6 | 340 | return -EINVAL; |
0079c5ae | 341 | if ((info->check_set & XT_RECENT_REAP) && !info->seconds) |
bd414ee6 | 342 | return -EINVAL; |
98e6d2d5 | 343 | if (info->hit_count > ip_pkt_list_tot) { |
ff67e4e4 | 344 | pr_info("hitcount (%u) is larger than " |
98e6d2d5 JE |
345 | "packets to be remembered (%u)\n", |
346 | info->hit_count, ip_pkt_list_tot); | |
bd414ee6 | 347 | return -EINVAL; |
98e6d2d5 | 348 | } |
404bdbfd | 349 | if (info->name[0] == '\0' || |
e948b20a | 350 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
bd414ee6 | 351 | return -EINVAL; |
1da177e4 | 352 | |
a0e889bb | 353 | mutex_lock(&recent_mutex); |
7d07d563 | 354 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
355 | if (t != NULL) { |
356 | t->refcnt++; | |
bd414ee6 | 357 | ret = 0; |
404bdbfd | 358 | goto out; |
1da177e4 LT |
359 | } |
360 | ||
404bdbfd | 361 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 362 | GFP_KERNEL); |
4a5a5c73 JE |
363 | if (t == NULL) { |
364 | ret = -ENOMEM; | |
404bdbfd | 365 | goto out; |
4a5a5c73 | 366 | } |
2b2283d0 | 367 | t->refcnt = 1; |
efdedd54 DF |
368 | |
369 | memcpy(&t->mask, &info->mask, sizeof(t->mask)); | |
404bdbfd PM |
370 | strcpy(t->name, info->name); |
371 | INIT_LIST_HEAD(&t->lru_list); | |
372 | for (i = 0; i < ip_list_hash_size; i++) | |
373 | INIT_LIST_HEAD(&t->iphash[i]); | |
374 | #ifdef CONFIG_PROC_FS | |
7d07d563 | 375 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 376 | &recent_mt_fops, t); |
b0ceb560 | 377 | if (pde == NULL) { |
404bdbfd | 378 | kfree(t); |
4a5a5c73 | 379 | ret = -ENOMEM; |
404bdbfd | 380 | goto out; |
1da177e4 | 381 | } |
b0ceb560 AD |
382 | pde->uid = ip_list_uid; |
383 | pde->gid = ip_list_gid; | |
1da177e4 | 384 | #endif |
a0e889bb | 385 | spin_lock_bh(&recent_lock); |
7d07d563 | 386 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 387 | spin_unlock_bh(&recent_lock); |
bd414ee6 | 388 | ret = 0; |
404bdbfd | 389 | out: |
a0e889bb | 390 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
391 | return ret; |
392 | } | |
1da177e4 | 393 | |
efdedd54 DF |
394 | static int recent_mt_check_v0(const struct xt_mtchk_param *par) |
395 | { | |
396 | const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo; | |
397 | struct xt_recent_mtinfo_v1 info_v1; | |
398 | ||
399 | /* Copy revision 0 structure to revision 1 */ | |
400 | memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo)); | |
401 | /* Set default mask to ensure backward compatible behaviour */ | |
402 | memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all)); | |
403 | ||
404 | return recent_mt_check(par, &info_v1); | |
405 | } | |
406 | ||
407 | static int recent_mt_check_v1(const struct xt_mtchk_param *par) | |
408 | { | |
409 | return recent_mt_check(par, par->matchinfo); | |
410 | } | |
411 | ||
6be3d859 | 412 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 413 | { |
7d07d563 | 414 | struct recent_net *recent_net = recent_pernet(par->net); |
efdedd54 | 415 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd | 416 | struct recent_table *t; |
1da177e4 | 417 | |
a0e889bb | 418 | mutex_lock(&recent_mutex); |
7d07d563 | 419 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 420 | if (--t->refcnt == 0) { |
a0e889bb | 421 | spin_lock_bh(&recent_lock); |
404bdbfd | 422 | list_del(&t->list); |
a0e889bb | 423 | spin_unlock_bh(&recent_lock); |
404bdbfd | 424 | #ifdef CONFIG_PROC_FS |
7d07d563 | 425 | remove_proc_entry(t->name, recent_net->xt_recent); |
1da177e4 | 426 | #endif |
a8ddc916 | 427 | recent_table_flush(t); |
404bdbfd | 428 | kfree(t); |
1da177e4 | 429 | } |
a0e889bb | 430 | mutex_unlock(&recent_mutex); |
404bdbfd | 431 | } |
1da177e4 | 432 | |
404bdbfd PM |
433 | #ifdef CONFIG_PROC_FS |
434 | struct recent_iter_state { | |
079aa88f | 435 | const struct recent_table *table; |
404bdbfd PM |
436 | unsigned int bucket; |
437 | }; | |
1da177e4 | 438 | |
404bdbfd | 439 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 440 | __acquires(recent_lock) |
404bdbfd PM |
441 | { |
442 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 443 | const struct recent_table *t = st->table; |
404bdbfd PM |
444 | struct recent_entry *e; |
445 | loff_t p = *pos; | |
1da177e4 | 446 | |
1da177e4 | 447 | spin_lock_bh(&recent_lock); |
1da177e4 | 448 | |
7c4e36bc JE |
449 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
450 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
451 | if (p-- == 0) |
452 | return e; | |
404bdbfd PM |
453 | return NULL; |
454 | } | |
1da177e4 | 455 | |
404bdbfd PM |
456 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
457 | { | |
458 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 459 | const struct recent_table *t = st->table; |
079aa88f JE |
460 | const struct recent_entry *e = v; |
461 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
462 | |
463 | while (head == &t->iphash[st->bucket]) { | |
464 | if (++st->bucket >= ip_list_hash_size) | |
465 | return NULL; | |
466 | head = t->iphash[st->bucket].next; | |
467 | } | |
468 | (*pos)++; | |
469 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
470 | } |
471 | ||
404bdbfd | 472 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 473 | __releases(recent_lock) |
1da177e4 | 474 | { |
404bdbfd PM |
475 | spin_unlock_bh(&recent_lock); |
476 | } | |
1da177e4 | 477 | |
404bdbfd PM |
478 | static int recent_seq_show(struct seq_file *seq, void *v) |
479 | { | |
3cf93c96 | 480 | const struct recent_entry *e = v; |
404bdbfd PM |
481 | unsigned int i; |
482 | ||
483 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 484 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
485 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
486 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 487 | else |
5b095d98 | 488 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 489 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
490 | for (i = 0; i < e->nstamps; i++) |
491 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
492 | seq_printf(seq, "\n"); | |
493 | return 0; | |
494 | } | |
1da177e4 | 495 | |
56b3d975 | 496 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
497 | .start = recent_seq_start, |
498 | .next = recent_seq_next, | |
499 | .stop = recent_seq_stop, | |
500 | .show = recent_seq_show, | |
501 | }; | |
1da177e4 | 502 | |
404bdbfd PM |
503 | static int recent_seq_open(struct inode *inode, struct file *file) |
504 | { | |
505 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 506 | struct recent_iter_state *st; |
404bdbfd | 507 | |
e2da5913 | 508 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
509 | if (st == NULL) |
510 | return -ENOMEM; | |
3af8e31c | 511 | |
404bdbfd | 512 | st->table = pde->data; |
e2da5913 | 513 | return 0; |
404bdbfd | 514 | } |
1da177e4 | 515 | |
079aa88f JE |
516 | static ssize_t |
517 | recent_mt_proc_write(struct file *file, const char __user *input, | |
518 | size_t size, loff_t *loff) | |
519 | { | |
520 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
521 | struct recent_table *t = pde->data; | |
522 | struct recent_entry *e; | |
523 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
524 | const char *c = buf; | |
325fb5b4 | 525 | union nf_inet_addr addr = {}; |
079aa88f JE |
526 | u_int16_t family; |
527 | bool add, succ; | |
528 | ||
529 | if (size == 0) | |
530 | return 0; | |
531 | if (size > sizeof(buf)) | |
532 | size = sizeof(buf); | |
533 | if (copy_from_user(buf, input, size) != 0) | |
534 | return -EFAULT; | |
535 | ||
536 | /* Strict protocol! */ | |
537 | if (*loff != 0) | |
538 | return -ESPIPE; | |
539 | switch (*c) { | |
540 | case '/': /* flush table */ | |
541 | spin_lock_bh(&recent_lock); | |
542 | recent_table_flush(t); | |
543 | spin_unlock_bh(&recent_lock); | |
544 | return size; | |
545 | case '-': /* remove address */ | |
546 | add = false; | |
547 | break; | |
548 | case '+': /* add address */ | |
549 | add = true; | |
550 | break; | |
551 | default: | |
8bee4bad | 552 | pr_info("Need \"+ip\", \"-ip\" or \"/\"\n"); |
079aa88f JE |
553 | return -EINVAL; |
554 | } | |
555 | ||
556 | ++c; | |
557 | --size; | |
558 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 559 | family = NFPROTO_IPV6; |
079aa88f JE |
560 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
561 | } else { | |
ee999d8b | 562 | family = NFPROTO_IPV4; |
079aa88f JE |
563 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
564 | } | |
565 | ||
566 | if (!succ) { | |
8bee4bad | 567 | pr_info("illegal address written to procfs\n"); |
079aa88f JE |
568 | return -EINVAL; |
569 | } | |
570 | ||
571 | spin_lock_bh(&recent_lock); | |
572 | e = recent_entry_lookup(t, &addr, family, 0); | |
573 | if (e == NULL) { | |
574 | if (add) | |
575 | recent_entry_init(t, &addr, family, 0); | |
576 | } else { | |
577 | if (add) | |
578 | recent_entry_update(t, e); | |
579 | else | |
580 | recent_entry_remove(t, e); | |
581 | } | |
582 | spin_unlock_bh(&recent_lock); | |
583 | /* Note we removed one above */ | |
584 | *loff += size + 1; | |
585 | return size + 1; | |
586 | } | |
587 | ||
588 | static const struct file_operations recent_mt_fops = { | |
589 | .open = recent_seq_open, | |
590 | .read = seq_read, | |
591 | .write = recent_mt_proc_write, | |
592 | .release = seq_release_private, | |
593 | .owner = THIS_MODULE, | |
6038f373 | 594 | .llseek = seq_lseek, |
079aa88f | 595 | }; |
7d07d563 AD |
596 | |
597 | static int __net_init recent_proc_net_init(struct net *net) | |
598 | { | |
599 | struct recent_net *recent_net = recent_pernet(net); | |
600 | ||
601 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
602 | if (!recent_net->xt_recent) | |
603 | return -ENOMEM; | |
7d07d563 AD |
604 | return 0; |
605 | } | |
606 | ||
607 | static void __net_exit recent_proc_net_exit(struct net *net) | |
608 | { | |
7d07d563 AD |
609 | proc_net_remove(net, "xt_recent"); |
610 | } | |
611 | #else | |
612 | static inline int recent_proc_net_init(struct net *net) | |
613 | { | |
614 | return 0; | |
615 | } | |
616 | ||
617 | static inline void recent_proc_net_exit(struct net *net) | |
618 | { | |
619 | } | |
1da177e4 | 620 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 621 | |
7d07d563 AD |
622 | static int __net_init recent_net_init(struct net *net) |
623 | { | |
624 | struct recent_net *recent_net = recent_pernet(net); | |
625 | ||
626 | INIT_LIST_HEAD(&recent_net->tables); | |
627 | return recent_proc_net_init(net); | |
628 | } | |
629 | ||
630 | static void __net_exit recent_net_exit(struct net *net) | |
631 | { | |
632 | struct recent_net *recent_net = recent_pernet(net); | |
633 | ||
634 | BUG_ON(!list_empty(&recent_net->tables)); | |
635 | recent_proc_net_exit(net); | |
636 | } | |
637 | ||
638 | static struct pernet_operations recent_net_ops = { | |
639 | .init = recent_net_init, | |
640 | .exit = recent_net_exit, | |
641 | .id = &recent_net_id, | |
642 | .size = sizeof(struct recent_net), | |
643 | }; | |
644 | ||
079aa88f JE |
645 | static struct xt_match recent_mt_reg[] __read_mostly = { |
646 | { | |
647 | .name = "recent", | |
648 | .revision = 0, | |
ee999d8b | 649 | .family = NFPROTO_IPV4, |
079aa88f JE |
650 | .match = recent_mt, |
651 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 | 652 | .checkentry = recent_mt_check_v0, |
079aa88f JE |
653 | .destroy = recent_mt_destroy, |
654 | .me = THIS_MODULE, | |
655 | }, | |
656 | { | |
657 | .name = "recent", | |
658 | .revision = 0, | |
ee999d8b | 659 | .family = NFPROTO_IPV6, |
079aa88f JE |
660 | .match = recent_mt, |
661 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 DF |
662 | .checkentry = recent_mt_check_v0, |
663 | .destroy = recent_mt_destroy, | |
664 | .me = THIS_MODULE, | |
665 | }, | |
666 | { | |
667 | .name = "recent", | |
668 | .revision = 1, | |
669 | .family = NFPROTO_IPV4, | |
670 | .match = recent_mt, | |
671 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
672 | .checkentry = recent_mt_check_v1, | |
079aa88f JE |
673 | .destroy = recent_mt_destroy, |
674 | .me = THIS_MODULE, | |
675 | }, | |
efdedd54 DF |
676 | { |
677 | .name = "recent", | |
678 | .revision = 1, | |
679 | .family = NFPROTO_IPV6, | |
680 | .match = recent_mt, | |
681 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
682 | .checkentry = recent_mt_check_v1, | |
683 | .destroy = recent_mt_destroy, | |
684 | .me = THIS_MODULE, | |
685 | } | |
1da177e4 LT |
686 | }; |
687 | ||
d3c5ee6d | 688 | static int __init recent_mt_init(void) |
1da177e4 | 689 | { |
404bdbfd | 690 | int err; |
1da177e4 | 691 | |
404bdbfd PM |
692 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
693 | return -EINVAL; | |
694 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 695 | |
7d07d563 | 696 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 697 | if (err) |
404bdbfd | 698 | return err; |
7d07d563 AD |
699 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
700 | if (err) | |
701 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
702 | return err; |
703 | } | |
704 | ||
d3c5ee6d | 705 | static void __exit recent_mt_exit(void) |
1da177e4 | 706 | { |
079aa88f | 707 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 708 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
709 | } |
710 | ||
d3c5ee6d JE |
711 | module_init(recent_mt_init); |
712 | module_exit(recent_mt_exit); |