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 | |
e7be6994 PM |
46 | static unsigned int ip_list_tot = 100; |
47 | static unsigned int ip_pkt_list_tot = 20; | |
48 | static unsigned int ip_list_hash_size = 0; | |
49 | static unsigned int ip_list_perms = 0644; | |
b93ff783 DDG |
50 | static unsigned int ip_list_uid = 0; |
51 | static unsigned int ip_list_gid = 0; | |
e7be6994 PM |
52 | module_param(ip_list_tot, uint, 0400); |
53 | module_param(ip_pkt_list_tot, uint, 0400); | |
54 | module_param(ip_list_hash_size, uint, 0400); | |
55 | module_param(ip_list_perms, uint, 0400); | |
5dc7a6d5 JE |
56 | module_param(ip_list_uid, uint, S_IRUGO | S_IWUSR); |
57 | module_param(ip_list_gid, uint, S_IRUGO | S_IWUSR); | |
404bdbfd | 58 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
98e6d2d5 | 59 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)"); |
404bdbfd | 60 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); |
079aa88f | 61 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
5dc7a6d5 JE |
62 | MODULE_PARM_DESC(ip_list_uid, "default owner of /proc/net/xt_recent/* files"); |
63 | MODULE_PARM_DESC(ip_list_gid, "default owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 64 | |
404bdbfd PM |
65 | struct recent_entry { |
66 | struct list_head list; | |
67 | struct list_head lru_list; | |
079aa88f JE |
68 | union nf_inet_addr addr; |
69 | u_int16_t family; | |
404bdbfd PM |
70 | u_int8_t ttl; |
71 | u_int8_t index; | |
72 | u_int16_t nstamps; | |
73 | unsigned long stamps[0]; | |
1da177e4 LT |
74 | }; |
75 | ||
404bdbfd PM |
76 | struct recent_table { |
77 | struct list_head list; | |
e948b20a | 78 | char name[XT_RECENT_NAME_LEN]; |
efdedd54 | 79 | union nf_inet_addr mask; |
404bdbfd PM |
80 | unsigned int refcnt; |
81 | unsigned int entries; | |
82 | struct list_head lru_list; | |
83 | struct list_head iphash[0]; | |
1da177e4 LT |
84 | }; |
85 | ||
7d07d563 AD |
86 | struct recent_net { |
87 | struct list_head tables; | |
88 | #ifdef CONFIG_PROC_FS | |
89 | struct proc_dir_entry *xt_recent; | |
7d07d563 AD |
90 | #endif |
91 | }; | |
92 | ||
93 | static int recent_net_id; | |
94 | static inline struct recent_net *recent_pernet(struct net *net) | |
95 | { | |
96 | return net_generic(net, recent_net_id); | |
97 | } | |
98 | ||
1da177e4 | 99 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 100 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
101 | |
102 | #ifdef CONFIG_PROC_FS | |
079aa88f | 103 | static const struct file_operations recent_old_fops, recent_mt_fops; |
1da177e4 LT |
104 | #endif |
105 | ||
294188ae JE |
106 | static u_int32_t hash_rnd __read_mostly; |
107 | static bool hash_rnd_inited __read_mostly; | |
079aa88f | 108 | |
294188ae | 109 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 110 | { |
079aa88f JE |
111 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
112 | (ip_list_hash_size - 1); | |
113 | } | |
1da177e4 | 114 | |
294188ae | 115 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 116 | { |
079aa88f JE |
117 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
118 | (ip_list_hash_size - 1); | |
1da177e4 LT |
119 | } |
120 | ||
404bdbfd | 121 | static struct recent_entry * |
079aa88f JE |
122 | recent_entry_lookup(const struct recent_table *table, |
123 | const union nf_inet_addr *addrp, u_int16_t family, | |
124 | u_int8_t ttl) | |
1da177e4 | 125 | { |
404bdbfd PM |
126 | struct recent_entry *e; |
127 | unsigned int h; | |
128 | ||
ee999d8b | 129 | if (family == NFPROTO_IPV4) |
079aa88f JE |
130 | h = recent_entry_hash4(addrp); |
131 | else | |
132 | h = recent_entry_hash6(addrp); | |
133 | ||
404bdbfd | 134 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
135 | if (e->family == family && |
136 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
137 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
138 | return e; |
139 | return NULL; | |
140 | } | |
1da177e4 | 141 | |
404bdbfd PM |
142 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
143 | { | |
144 | list_del(&e->list); | |
145 | list_del(&e->lru_list); | |
146 | kfree(e); | |
147 | t->entries--; | |
148 | } | |
1da177e4 | 149 | |
0079c5ae TG |
150 | /* |
151 | * Drop entries with timestamps older then 'time'. | |
152 | */ | |
153 | static void recent_entry_reap(struct recent_table *t, unsigned long time) | |
154 | { | |
155 | struct recent_entry *e; | |
156 | ||
157 | /* | |
158 | * The head of the LRU list is always the oldest entry. | |
159 | */ | |
160 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
161 | ||
162 | /* | |
163 | * The last time stamp is the most recent. | |
164 | */ | |
165 | if (time_after(time, e->stamps[e->index-1])) | |
166 | recent_entry_remove(t, e); | |
167 | } | |
168 | ||
404bdbfd | 169 | static struct recent_entry * |
079aa88f JE |
170 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
171 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
172 | { |
173 | struct recent_entry *e; | |
1da177e4 | 174 | |
404bdbfd PM |
175 | if (t->entries >= ip_list_tot) { |
176 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
177 | recent_entry_remove(t, e); | |
1da177e4 | 178 | } |
404bdbfd PM |
179 | e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot, |
180 | GFP_ATOMIC); | |
181 | if (e == NULL) | |
182 | return NULL; | |
079aa88f | 183 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
184 | e->ttl = ttl; |
185 | e->stamps[0] = jiffies; | |
186 | e->nstamps = 1; | |
187 | e->index = 1; | |
079aa88f | 188 | e->family = family; |
ee999d8b | 189 | if (family == NFPROTO_IPV4) |
079aa88f JE |
190 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
191 | else | |
192 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
193 | list_add_tail(&e->lru_list, &t->lru_list); |
194 | t->entries++; | |
195 | return e; | |
196 | } | |
1da177e4 | 197 | |
404bdbfd PM |
198 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
199 | { | |
2c08522e | 200 | e->index %= ip_pkt_list_tot; |
404bdbfd PM |
201 | e->stamps[e->index++] = jiffies; |
202 | if (e->index > e->nstamps) | |
203 | e->nstamps = e->index; | |
404bdbfd PM |
204 | list_move_tail(&e->lru_list, &t->lru_list); |
205 | } | |
1da177e4 | 206 | |
7d07d563 AD |
207 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
208 | const char *name) | |
404bdbfd PM |
209 | { |
210 | struct recent_table *t; | |
1da177e4 | 211 | |
7d07d563 | 212 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
213 | if (!strcmp(t->name, name)) |
214 | return t; | |
215 | return NULL; | |
216 | } | |
1da177e4 | 217 | |
404bdbfd PM |
218 | static void recent_table_flush(struct recent_table *t) |
219 | { | |
220 | struct recent_entry *e, *next; | |
221 | unsigned int i; | |
1da177e4 | 222 | |
7c4e36bc | 223 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
224 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
225 | recent_entry_remove(t, e); | |
1da177e4 LT |
226 | } |
227 | ||
1d93a9cb | 228 | static bool |
62fc8051 | 229 | recent_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 230 | { |
7d07d563 AD |
231 | struct net *net = dev_net(par->in ? par->in : par->out); |
232 | struct recent_net *recent_net = recent_pernet(net); | |
efdedd54 | 233 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd PM |
234 | struct recent_table *t; |
235 | struct recent_entry *e; | |
efdedd54 | 236 | union nf_inet_addr addr = {}, addr_mask; |
404bdbfd | 237 | u_int8_t ttl; |
1d93a9cb | 238 | bool ret = info->invert; |
1da177e4 | 239 | |
aa5fa318 | 240 | if (par->family == NFPROTO_IPV4) { |
079aa88f JE |
241 | const struct iphdr *iph = ip_hdr(skb); |
242 | ||
243 | if (info->side == XT_RECENT_DEST) | |
244 | addr.ip = iph->daddr; | |
245 | else | |
246 | addr.ip = iph->saddr; | |
247 | ||
248 | ttl = iph->ttl; | |
249 | } else { | |
250 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
251 | ||
252 | if (info->side == XT_RECENT_DEST) | |
253 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
254 | else | |
255 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
256 | ||
257 | ttl = iph->hop_limit; | |
258 | } | |
1da177e4 | 259 | |
404bdbfd | 260 | /* use TTL as seen before forwarding */ |
f7108a20 | 261 | if (par->out != NULL && skb->sk == NULL) |
404bdbfd | 262 | ttl++; |
1da177e4 | 263 | |
1da177e4 | 264 | spin_lock_bh(&recent_lock); |
7d07d563 | 265 | t = recent_table_lookup(recent_net, info->name); |
efdedd54 DF |
266 | |
267 | nf_inet_addr_mask(&addr, &addr_mask, &t->mask); | |
268 | ||
269 | e = recent_entry_lookup(t, &addr_mask, par->family, | |
079aa88f | 270 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 271 | if (e == NULL) { |
e948b20a | 272 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 273 | goto out; |
efdedd54 | 274 | e = recent_entry_init(t, &addr_mask, par->family, ttl); |
404bdbfd | 275 | if (e == NULL) |
b4ba2611 | 276 | par->hotdrop = true; |
1d93a9cb | 277 | ret = !ret; |
404bdbfd | 278 | goto out; |
1da177e4 LT |
279 | } |
280 | ||
e948b20a | 281 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 282 | ret = !ret; |
e948b20a | 283 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 284 | recent_entry_remove(t, e); |
1d93a9cb | 285 | ret = !ret; |
e948b20a | 286 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 287 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
288 | unsigned int i, hits = 0; |
289 | ||
290 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 291 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd | 292 | continue; |
ef169150 | 293 | if (!info->hit_count || ++hits >= info->hit_count) { |
1d93a9cb | 294 | ret = !ret; |
404bdbfd | 295 | break; |
1da177e4 | 296 | } |
1da177e4 | 297 | } |
0079c5ae TG |
298 | |
299 | /* info->seconds must be non-zero */ | |
300 | if (info->check_set & XT_RECENT_REAP) | |
301 | recent_entry_reap(t, time); | |
1da177e4 LT |
302 | } |
303 | ||
e948b20a JE |
304 | if (info->check_set & XT_RECENT_SET || |
305 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
306 | recent_entry_update(t, e); |
307 | e->ttl = ttl; | |
308 | } | |
309 | out: | |
310 | spin_unlock_bh(&recent_lock); | |
311 | return ret; | |
1da177e4 LT |
312 | } |
313 | ||
2727de76 ED |
314 | static void recent_table_free(void *addr) |
315 | { | |
4cb28970 | 316 | kvfree(addr); |
2727de76 ED |
317 | } |
318 | ||
efdedd54 DF |
319 | static int recent_mt_check(const struct xt_mtchk_param *par, |
320 | const struct xt_recent_mtinfo_v1 *info) | |
1da177e4 | 321 | { |
7d07d563 | 322 | struct recent_net *recent_net = recent_pernet(par->net); |
404bdbfd | 323 | struct recent_table *t; |
b0ceb560 AD |
324 | #ifdef CONFIG_PROC_FS |
325 | struct proc_dir_entry *pde; | |
da742808 EB |
326 | kuid_t uid; |
327 | kgid_t gid; | |
b0ceb560 | 328 | #endif |
95c96174 | 329 | unsigned int i; |
bd414ee6 | 330 | int ret = -EINVAL; |
2727de76 | 331 | size_t sz; |
1da177e4 | 332 | |
294188ae JE |
333 | if (unlikely(!hash_rnd_inited)) { |
334 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
335 | hash_rnd_inited = true; | |
336 | } | |
606a9a02 | 337 | if (info->check_set & ~XT_RECENT_VALID_FLAGS) { |
ff67e4e4 JE |
338 | pr_info("Unsupported user space flags (%08x)\n", |
339 | info->check_set); | |
bd414ee6 | 340 | return -EINVAL; |
606a9a02 | 341 | } |
404bdbfd | 342 | if (hweight8(info->check_set & |
e948b20a JE |
343 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
344 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
bd414ee6 | 345 | return -EINVAL; |
e948b20a | 346 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
0079c5ae TG |
347 | (info->seconds || info->hit_count || |
348 | (info->check_set & XT_RECENT_MODIFIERS))) | |
bd414ee6 | 349 | return -EINVAL; |
0079c5ae | 350 | if ((info->check_set & XT_RECENT_REAP) && !info->seconds) |
bd414ee6 | 351 | return -EINVAL; |
98e6d2d5 | 352 | if (info->hit_count > ip_pkt_list_tot) { |
ff67e4e4 | 353 | pr_info("hitcount (%u) is larger than " |
98e6d2d5 JE |
354 | "packets to be remembered (%u)\n", |
355 | info->hit_count, ip_pkt_list_tot); | |
bd414ee6 | 356 | return -EINVAL; |
98e6d2d5 | 357 | } |
404bdbfd | 358 | if (info->name[0] == '\0' || |
e948b20a | 359 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
bd414ee6 | 360 | return -EINVAL; |
1da177e4 | 361 | |
a0e889bb | 362 | mutex_lock(&recent_mutex); |
7d07d563 | 363 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
364 | if (t != NULL) { |
365 | t->refcnt++; | |
bd414ee6 | 366 | ret = 0; |
404bdbfd | 367 | goto out; |
1da177e4 LT |
368 | } |
369 | ||
2727de76 ED |
370 | sz = sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size; |
371 | if (sz <= PAGE_SIZE) | |
372 | t = kzalloc(sz, GFP_KERNEL); | |
373 | else | |
374 | t = vzalloc(sz); | |
4a5a5c73 JE |
375 | if (t == NULL) { |
376 | ret = -ENOMEM; | |
404bdbfd | 377 | goto out; |
4a5a5c73 | 378 | } |
2b2283d0 | 379 | t->refcnt = 1; |
efdedd54 DF |
380 | |
381 | memcpy(&t->mask, &info->mask, sizeof(t->mask)); | |
404bdbfd PM |
382 | strcpy(t->name, info->name); |
383 | INIT_LIST_HEAD(&t->lru_list); | |
384 | for (i = 0; i < ip_list_hash_size; i++) | |
385 | INIT_LIST_HEAD(&t->iphash[i]); | |
386 | #ifdef CONFIG_PROC_FS | |
da742808 EB |
387 | uid = make_kuid(&init_user_ns, ip_list_uid); |
388 | gid = make_kgid(&init_user_ns, ip_list_gid); | |
389 | if (!uid_valid(uid) || !gid_valid(gid)) { | |
2727de76 | 390 | recent_table_free(t); |
da742808 EB |
391 | ret = -EINVAL; |
392 | goto out; | |
393 | } | |
7d07d563 | 394 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 395 | &recent_mt_fops, t); |
b0ceb560 | 396 | if (pde == NULL) { |
2727de76 | 397 | recent_table_free(t); |
4a5a5c73 | 398 | ret = -ENOMEM; |
404bdbfd | 399 | goto out; |
1da177e4 | 400 | } |
271a15ea | 401 | proc_set_user(pde, uid, gid); |
1da177e4 | 402 | #endif |
a0e889bb | 403 | spin_lock_bh(&recent_lock); |
7d07d563 | 404 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 405 | spin_unlock_bh(&recent_lock); |
bd414ee6 | 406 | ret = 0; |
404bdbfd | 407 | out: |
a0e889bb | 408 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
409 | return ret; |
410 | } | |
1da177e4 | 411 | |
efdedd54 DF |
412 | static int recent_mt_check_v0(const struct xt_mtchk_param *par) |
413 | { | |
414 | const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo; | |
415 | struct xt_recent_mtinfo_v1 info_v1; | |
416 | ||
417 | /* Copy revision 0 structure to revision 1 */ | |
418 | memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo)); | |
419 | /* Set default mask to ensure backward compatible behaviour */ | |
420 | memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all)); | |
421 | ||
422 | return recent_mt_check(par, &info_v1); | |
423 | } | |
424 | ||
425 | static int recent_mt_check_v1(const struct xt_mtchk_param *par) | |
426 | { | |
427 | return recent_mt_check(par, par->matchinfo); | |
428 | } | |
429 | ||
6be3d859 | 430 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 431 | { |
7d07d563 | 432 | struct recent_net *recent_net = recent_pernet(par->net); |
efdedd54 | 433 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd | 434 | struct recent_table *t; |
1da177e4 | 435 | |
a0e889bb | 436 | mutex_lock(&recent_mutex); |
7d07d563 | 437 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 438 | if (--t->refcnt == 0) { |
a0e889bb | 439 | spin_lock_bh(&recent_lock); |
404bdbfd | 440 | list_del(&t->list); |
a0e889bb | 441 | spin_unlock_bh(&recent_lock); |
404bdbfd | 442 | #ifdef CONFIG_PROC_FS |
665e205c VL |
443 | if (recent_net->xt_recent != NULL) |
444 | remove_proc_entry(t->name, recent_net->xt_recent); | |
1da177e4 | 445 | #endif |
a8ddc916 | 446 | recent_table_flush(t); |
2727de76 | 447 | recent_table_free(t); |
1da177e4 | 448 | } |
a0e889bb | 449 | mutex_unlock(&recent_mutex); |
404bdbfd | 450 | } |
1da177e4 | 451 | |
404bdbfd PM |
452 | #ifdef CONFIG_PROC_FS |
453 | struct recent_iter_state { | |
079aa88f | 454 | const struct recent_table *table; |
404bdbfd PM |
455 | unsigned int bucket; |
456 | }; | |
1da177e4 | 457 | |
404bdbfd | 458 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 459 | __acquires(recent_lock) |
404bdbfd PM |
460 | { |
461 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 462 | const struct recent_table *t = st->table; |
404bdbfd PM |
463 | struct recent_entry *e; |
464 | loff_t p = *pos; | |
1da177e4 | 465 | |
1da177e4 | 466 | spin_lock_bh(&recent_lock); |
1da177e4 | 467 | |
7c4e36bc JE |
468 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
469 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
470 | if (p-- == 0) |
471 | return e; | |
404bdbfd PM |
472 | return NULL; |
473 | } | |
1da177e4 | 474 | |
404bdbfd PM |
475 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
476 | { | |
477 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 478 | const struct recent_table *t = st->table; |
079aa88f JE |
479 | const struct recent_entry *e = v; |
480 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
481 | |
482 | while (head == &t->iphash[st->bucket]) { | |
483 | if (++st->bucket >= ip_list_hash_size) | |
484 | return NULL; | |
485 | head = t->iphash[st->bucket].next; | |
486 | } | |
487 | (*pos)++; | |
488 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
489 | } |
490 | ||
404bdbfd | 491 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 492 | __releases(recent_lock) |
1da177e4 | 493 | { |
404bdbfd PM |
494 | spin_unlock_bh(&recent_lock); |
495 | } | |
1da177e4 | 496 | |
404bdbfd PM |
497 | static int recent_seq_show(struct seq_file *seq, void *v) |
498 | { | |
3cf93c96 | 499 | const struct recent_entry *e = v; |
404bdbfd PM |
500 | unsigned int i; |
501 | ||
502 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 503 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
504 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
505 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 506 | else |
5b095d98 | 507 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 508 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
509 | for (i = 0; i < e->nstamps; i++) |
510 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
511 | seq_printf(seq, "\n"); | |
512 | return 0; | |
513 | } | |
1da177e4 | 514 | |
56b3d975 | 515 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
516 | .start = recent_seq_start, |
517 | .next = recent_seq_next, | |
518 | .stop = recent_seq_stop, | |
519 | .show = recent_seq_show, | |
520 | }; | |
1da177e4 | 521 | |
404bdbfd PM |
522 | static int recent_seq_open(struct inode *inode, struct file *file) |
523 | { | |
404bdbfd | 524 | struct recent_iter_state *st; |
404bdbfd | 525 | |
e2da5913 | 526 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
527 | if (st == NULL) |
528 | return -ENOMEM; | |
3af8e31c | 529 | |
d9dda78b | 530 | st->table = PDE_DATA(inode); |
e2da5913 | 531 | return 0; |
404bdbfd | 532 | } |
1da177e4 | 533 | |
079aa88f JE |
534 | static ssize_t |
535 | recent_mt_proc_write(struct file *file, const char __user *input, | |
536 | size_t size, loff_t *loff) | |
537 | { | |
d9dda78b | 538 | struct recent_table *t = PDE_DATA(file_inode(file)); |
079aa88f JE |
539 | struct recent_entry *e; |
540 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
541 | const char *c = buf; | |
325fb5b4 | 542 | union nf_inet_addr addr = {}; |
079aa88f JE |
543 | u_int16_t family; |
544 | bool add, succ; | |
545 | ||
546 | if (size == 0) | |
547 | return 0; | |
548 | if (size > sizeof(buf)) | |
549 | size = sizeof(buf); | |
550 | if (copy_from_user(buf, input, size) != 0) | |
551 | return -EFAULT; | |
552 | ||
553 | /* Strict protocol! */ | |
554 | if (*loff != 0) | |
555 | return -ESPIPE; | |
556 | switch (*c) { | |
557 | case '/': /* flush table */ | |
558 | spin_lock_bh(&recent_lock); | |
559 | recent_table_flush(t); | |
560 | spin_unlock_bh(&recent_lock); | |
561 | return size; | |
562 | case '-': /* remove address */ | |
563 | add = false; | |
564 | break; | |
565 | case '+': /* add address */ | |
566 | add = true; | |
567 | break; | |
568 | default: | |
8bee4bad | 569 | pr_info("Need \"+ip\", \"-ip\" or \"/\"\n"); |
079aa88f JE |
570 | return -EINVAL; |
571 | } | |
572 | ||
573 | ++c; | |
574 | --size; | |
575 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 576 | family = NFPROTO_IPV6; |
079aa88f JE |
577 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
578 | } else { | |
ee999d8b | 579 | family = NFPROTO_IPV4; |
079aa88f JE |
580 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
581 | } | |
582 | ||
583 | if (!succ) { | |
8bee4bad | 584 | pr_info("illegal address written to procfs\n"); |
079aa88f JE |
585 | return -EINVAL; |
586 | } | |
587 | ||
588 | spin_lock_bh(&recent_lock); | |
589 | e = recent_entry_lookup(t, &addr, family, 0); | |
590 | if (e == NULL) { | |
591 | if (add) | |
592 | recent_entry_init(t, &addr, family, 0); | |
593 | } else { | |
594 | if (add) | |
595 | recent_entry_update(t, e); | |
596 | else | |
597 | recent_entry_remove(t, e); | |
598 | } | |
599 | spin_unlock_bh(&recent_lock); | |
600 | /* Note we removed one above */ | |
601 | *loff += size + 1; | |
602 | return size + 1; | |
603 | } | |
604 | ||
605 | static const struct file_operations recent_mt_fops = { | |
606 | .open = recent_seq_open, | |
607 | .read = seq_read, | |
608 | .write = recent_mt_proc_write, | |
609 | .release = seq_release_private, | |
610 | .owner = THIS_MODULE, | |
6038f373 | 611 | .llseek = seq_lseek, |
079aa88f | 612 | }; |
7d07d563 AD |
613 | |
614 | static int __net_init recent_proc_net_init(struct net *net) | |
615 | { | |
616 | struct recent_net *recent_net = recent_pernet(net); | |
617 | ||
618 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
619 | if (!recent_net->xt_recent) | |
620 | return -ENOMEM; | |
7d07d563 AD |
621 | return 0; |
622 | } | |
623 | ||
624 | static void __net_exit recent_proc_net_exit(struct net *net) | |
625 | { | |
665e205c VL |
626 | struct recent_net *recent_net = recent_pernet(net); |
627 | struct recent_table *t; | |
628 | ||
629 | /* recent_net_exit() is called before recent_mt_destroy(). Make sure | |
630 | * that the parent xt_recent proc entry is is empty before trying to | |
631 | * remove it. | |
632 | */ | |
633 | spin_lock_bh(&recent_lock); | |
634 | list_for_each_entry(t, &recent_net->tables, list) | |
635 | remove_proc_entry(t->name, recent_net->xt_recent); | |
636 | ||
637 | recent_net->xt_recent = NULL; | |
638 | spin_unlock_bh(&recent_lock); | |
639 | ||
ece31ffd | 640 | remove_proc_entry("xt_recent", net->proc_net); |
7d07d563 AD |
641 | } |
642 | #else | |
643 | static inline int recent_proc_net_init(struct net *net) | |
644 | { | |
645 | return 0; | |
646 | } | |
647 | ||
648 | static inline void recent_proc_net_exit(struct net *net) | |
649 | { | |
650 | } | |
1da177e4 | 651 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 652 | |
7d07d563 AD |
653 | static int __net_init recent_net_init(struct net *net) |
654 | { | |
655 | struct recent_net *recent_net = recent_pernet(net); | |
656 | ||
657 | INIT_LIST_HEAD(&recent_net->tables); | |
658 | return recent_proc_net_init(net); | |
659 | } | |
660 | ||
661 | static void __net_exit recent_net_exit(struct net *net) | |
662 | { | |
7d07d563 AD |
663 | recent_proc_net_exit(net); |
664 | } | |
665 | ||
666 | static struct pernet_operations recent_net_ops = { | |
667 | .init = recent_net_init, | |
668 | .exit = recent_net_exit, | |
669 | .id = &recent_net_id, | |
670 | .size = sizeof(struct recent_net), | |
671 | }; | |
672 | ||
079aa88f JE |
673 | static struct xt_match recent_mt_reg[] __read_mostly = { |
674 | { | |
675 | .name = "recent", | |
676 | .revision = 0, | |
ee999d8b | 677 | .family = NFPROTO_IPV4, |
079aa88f JE |
678 | .match = recent_mt, |
679 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 | 680 | .checkentry = recent_mt_check_v0, |
079aa88f JE |
681 | .destroy = recent_mt_destroy, |
682 | .me = THIS_MODULE, | |
683 | }, | |
684 | { | |
685 | .name = "recent", | |
686 | .revision = 0, | |
ee999d8b | 687 | .family = NFPROTO_IPV6, |
079aa88f JE |
688 | .match = recent_mt, |
689 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 DF |
690 | .checkentry = recent_mt_check_v0, |
691 | .destroy = recent_mt_destroy, | |
692 | .me = THIS_MODULE, | |
693 | }, | |
694 | { | |
695 | .name = "recent", | |
696 | .revision = 1, | |
697 | .family = NFPROTO_IPV4, | |
698 | .match = recent_mt, | |
699 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
700 | .checkentry = recent_mt_check_v1, | |
079aa88f JE |
701 | .destroy = recent_mt_destroy, |
702 | .me = THIS_MODULE, | |
703 | }, | |
efdedd54 DF |
704 | { |
705 | .name = "recent", | |
706 | .revision = 1, | |
707 | .family = NFPROTO_IPV6, | |
708 | .match = recent_mt, | |
709 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
710 | .checkentry = recent_mt_check_v1, | |
711 | .destroy = recent_mt_destroy, | |
712 | .me = THIS_MODULE, | |
713 | } | |
1da177e4 LT |
714 | }; |
715 | ||
d3c5ee6d | 716 | static int __init recent_mt_init(void) |
1da177e4 | 717 | { |
404bdbfd | 718 | int err; |
1da177e4 | 719 | |
404bdbfd PM |
720 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
721 | return -EINVAL; | |
722 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 723 | |
7d07d563 | 724 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 725 | if (err) |
404bdbfd | 726 | return err; |
7d07d563 AD |
727 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
728 | if (err) | |
729 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
730 | return err; |
731 | } | |
732 | ||
d3c5ee6d | 733 | static void __exit recent_mt_exit(void) |
1da177e4 | 734 | { |
079aa88f | 735 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 736 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
737 | } |
738 | ||
d3c5ee6d JE |
739 | module_init(recent_mt_init); |
740 | module_exit(recent_mt_exit); |