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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> |
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; | |
da742808 EB |
320 | kuid_t uid; |
321 | kgid_t gid; | |
b0ceb560 | 322 | #endif |
95c96174 | 323 | unsigned int i; |
bd414ee6 | 324 | int ret = -EINVAL; |
1da177e4 | 325 | |
294188ae JE |
326 | if (unlikely(!hash_rnd_inited)) { |
327 | get_random_bytes(&hash_rnd, sizeof(hash_rnd)); | |
328 | hash_rnd_inited = true; | |
329 | } | |
606a9a02 | 330 | if (info->check_set & ~XT_RECENT_VALID_FLAGS) { |
ff67e4e4 JE |
331 | pr_info("Unsupported user space flags (%08x)\n", |
332 | info->check_set); | |
bd414ee6 | 333 | return -EINVAL; |
606a9a02 | 334 | } |
404bdbfd | 335 | if (hweight8(info->check_set & |
e948b20a JE |
336 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
337 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
bd414ee6 | 338 | return -EINVAL; |
e948b20a | 339 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
0079c5ae TG |
340 | (info->seconds || info->hit_count || |
341 | (info->check_set & XT_RECENT_MODIFIERS))) | |
bd414ee6 | 342 | return -EINVAL; |
0079c5ae | 343 | if ((info->check_set & XT_RECENT_REAP) && !info->seconds) |
bd414ee6 | 344 | return -EINVAL; |
98e6d2d5 | 345 | if (info->hit_count > ip_pkt_list_tot) { |
ff67e4e4 | 346 | pr_info("hitcount (%u) is larger than " |
98e6d2d5 JE |
347 | "packets to be remembered (%u)\n", |
348 | info->hit_count, ip_pkt_list_tot); | |
bd414ee6 | 349 | return -EINVAL; |
98e6d2d5 | 350 | } |
404bdbfd | 351 | if (info->name[0] == '\0' || |
e948b20a | 352 | strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) |
bd414ee6 | 353 | return -EINVAL; |
1da177e4 | 354 | |
a0e889bb | 355 | mutex_lock(&recent_mutex); |
7d07d563 | 356 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd PM |
357 | if (t != NULL) { |
358 | t->refcnt++; | |
bd414ee6 | 359 | ret = 0; |
404bdbfd | 360 | goto out; |
1da177e4 LT |
361 | } |
362 | ||
404bdbfd | 363 | t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size, |
a0e889bb | 364 | GFP_KERNEL); |
4a5a5c73 JE |
365 | if (t == NULL) { |
366 | ret = -ENOMEM; | |
404bdbfd | 367 | goto out; |
4a5a5c73 | 368 | } |
2b2283d0 | 369 | t->refcnt = 1; |
efdedd54 DF |
370 | |
371 | memcpy(&t->mask, &info->mask, sizeof(t->mask)); | |
404bdbfd PM |
372 | strcpy(t->name, info->name); |
373 | INIT_LIST_HEAD(&t->lru_list); | |
374 | for (i = 0; i < ip_list_hash_size; i++) | |
375 | INIT_LIST_HEAD(&t->iphash[i]); | |
376 | #ifdef CONFIG_PROC_FS | |
da742808 EB |
377 | uid = make_kuid(&init_user_ns, ip_list_uid); |
378 | gid = make_kgid(&init_user_ns, ip_list_gid); | |
379 | if (!uid_valid(uid) || !gid_valid(gid)) { | |
380 | kfree(t); | |
381 | ret = -EINVAL; | |
382 | goto out; | |
383 | } | |
7d07d563 | 384 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 385 | &recent_mt_fops, t); |
b0ceb560 | 386 | if (pde == NULL) { |
404bdbfd | 387 | kfree(t); |
4a5a5c73 | 388 | ret = -ENOMEM; |
404bdbfd | 389 | goto out; |
1da177e4 | 390 | } |
da742808 EB |
391 | pde->uid = uid; |
392 | pde->gid = gid; | |
1da177e4 | 393 | #endif |
a0e889bb | 394 | spin_lock_bh(&recent_lock); |
7d07d563 | 395 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 396 | spin_unlock_bh(&recent_lock); |
bd414ee6 | 397 | ret = 0; |
404bdbfd | 398 | out: |
a0e889bb | 399 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
400 | return ret; |
401 | } | |
1da177e4 | 402 | |
efdedd54 DF |
403 | static int recent_mt_check_v0(const struct xt_mtchk_param *par) |
404 | { | |
405 | const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo; | |
406 | struct xt_recent_mtinfo_v1 info_v1; | |
407 | ||
408 | /* Copy revision 0 structure to revision 1 */ | |
409 | memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo)); | |
410 | /* Set default mask to ensure backward compatible behaviour */ | |
411 | memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all)); | |
412 | ||
413 | return recent_mt_check(par, &info_v1); | |
414 | } | |
415 | ||
416 | static int recent_mt_check_v1(const struct xt_mtchk_param *par) | |
417 | { | |
418 | return recent_mt_check(par, par->matchinfo); | |
419 | } | |
420 | ||
6be3d859 | 421 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 422 | { |
7d07d563 | 423 | struct recent_net *recent_net = recent_pernet(par->net); |
efdedd54 | 424 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd | 425 | struct recent_table *t; |
1da177e4 | 426 | |
a0e889bb | 427 | mutex_lock(&recent_mutex); |
7d07d563 | 428 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 429 | if (--t->refcnt == 0) { |
a0e889bb | 430 | spin_lock_bh(&recent_lock); |
404bdbfd | 431 | list_del(&t->list); |
a0e889bb | 432 | spin_unlock_bh(&recent_lock); |
404bdbfd | 433 | #ifdef CONFIG_PROC_FS |
7d07d563 | 434 | remove_proc_entry(t->name, recent_net->xt_recent); |
1da177e4 | 435 | #endif |
a8ddc916 | 436 | recent_table_flush(t); |
404bdbfd | 437 | kfree(t); |
1da177e4 | 438 | } |
a0e889bb | 439 | mutex_unlock(&recent_mutex); |
404bdbfd | 440 | } |
1da177e4 | 441 | |
404bdbfd PM |
442 | #ifdef CONFIG_PROC_FS |
443 | struct recent_iter_state { | |
079aa88f | 444 | const struct recent_table *table; |
404bdbfd PM |
445 | unsigned int bucket; |
446 | }; | |
1da177e4 | 447 | |
404bdbfd | 448 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 449 | __acquires(recent_lock) |
404bdbfd PM |
450 | { |
451 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 452 | const struct recent_table *t = st->table; |
404bdbfd PM |
453 | struct recent_entry *e; |
454 | loff_t p = *pos; | |
1da177e4 | 455 | |
1da177e4 | 456 | spin_lock_bh(&recent_lock); |
1da177e4 | 457 | |
7c4e36bc JE |
458 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
459 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
460 | if (p-- == 0) |
461 | return e; | |
404bdbfd PM |
462 | return NULL; |
463 | } | |
1da177e4 | 464 | |
404bdbfd PM |
465 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
466 | { | |
467 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 468 | const struct recent_table *t = st->table; |
079aa88f JE |
469 | const struct recent_entry *e = v; |
470 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
471 | |
472 | while (head == &t->iphash[st->bucket]) { | |
473 | if (++st->bucket >= ip_list_hash_size) | |
474 | return NULL; | |
475 | head = t->iphash[st->bucket].next; | |
476 | } | |
477 | (*pos)++; | |
478 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
479 | } |
480 | ||
404bdbfd | 481 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 482 | __releases(recent_lock) |
1da177e4 | 483 | { |
404bdbfd PM |
484 | spin_unlock_bh(&recent_lock); |
485 | } | |
1da177e4 | 486 | |
404bdbfd PM |
487 | static int recent_seq_show(struct seq_file *seq, void *v) |
488 | { | |
3cf93c96 | 489 | const struct recent_entry *e = v; |
404bdbfd PM |
490 | unsigned int i; |
491 | ||
492 | i = (e->index - 1) % ip_pkt_list_tot; | |
ee999d8b | 493 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
494 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
495 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 496 | else |
5b095d98 | 497 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 498 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
499 | for (i = 0; i < e->nstamps; i++) |
500 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
501 | seq_printf(seq, "\n"); | |
502 | return 0; | |
503 | } | |
1da177e4 | 504 | |
56b3d975 | 505 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
506 | .start = recent_seq_start, |
507 | .next = recent_seq_next, | |
508 | .stop = recent_seq_stop, | |
509 | .show = recent_seq_show, | |
510 | }; | |
1da177e4 | 511 | |
404bdbfd PM |
512 | static int recent_seq_open(struct inode *inode, struct file *file) |
513 | { | |
514 | struct proc_dir_entry *pde = PDE(inode); | |
404bdbfd | 515 | struct recent_iter_state *st; |
404bdbfd | 516 | |
e2da5913 | 517 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
518 | if (st == NULL) |
519 | return -ENOMEM; | |
3af8e31c | 520 | |
404bdbfd | 521 | st->table = pde->data; |
e2da5913 | 522 | return 0; |
404bdbfd | 523 | } |
1da177e4 | 524 | |
079aa88f JE |
525 | static ssize_t |
526 | recent_mt_proc_write(struct file *file, const char __user *input, | |
527 | size_t size, loff_t *loff) | |
528 | { | |
529 | const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode); | |
530 | struct recent_table *t = pde->data; | |
531 | struct recent_entry *e; | |
532 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
533 | const char *c = buf; | |
325fb5b4 | 534 | union nf_inet_addr addr = {}; |
079aa88f JE |
535 | u_int16_t family; |
536 | bool add, succ; | |
537 | ||
538 | if (size == 0) | |
539 | return 0; | |
540 | if (size > sizeof(buf)) | |
541 | size = sizeof(buf); | |
542 | if (copy_from_user(buf, input, size) != 0) | |
543 | return -EFAULT; | |
544 | ||
545 | /* Strict protocol! */ | |
546 | if (*loff != 0) | |
547 | return -ESPIPE; | |
548 | switch (*c) { | |
549 | case '/': /* flush table */ | |
550 | spin_lock_bh(&recent_lock); | |
551 | recent_table_flush(t); | |
552 | spin_unlock_bh(&recent_lock); | |
553 | return size; | |
554 | case '-': /* remove address */ | |
555 | add = false; | |
556 | break; | |
557 | case '+': /* add address */ | |
558 | add = true; | |
559 | break; | |
560 | default: | |
8bee4bad | 561 | pr_info("Need \"+ip\", \"-ip\" or \"/\"\n"); |
079aa88f JE |
562 | return -EINVAL; |
563 | } | |
564 | ||
565 | ++c; | |
566 | --size; | |
567 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 568 | family = NFPROTO_IPV6; |
079aa88f JE |
569 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
570 | } else { | |
ee999d8b | 571 | family = NFPROTO_IPV4; |
079aa88f JE |
572 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
573 | } | |
574 | ||
575 | if (!succ) { | |
8bee4bad | 576 | pr_info("illegal address written to procfs\n"); |
079aa88f JE |
577 | return -EINVAL; |
578 | } | |
579 | ||
580 | spin_lock_bh(&recent_lock); | |
581 | e = recent_entry_lookup(t, &addr, family, 0); | |
582 | if (e == NULL) { | |
583 | if (add) | |
584 | recent_entry_init(t, &addr, family, 0); | |
585 | } else { | |
586 | if (add) | |
587 | recent_entry_update(t, e); | |
588 | else | |
589 | recent_entry_remove(t, e); | |
590 | } | |
591 | spin_unlock_bh(&recent_lock); | |
592 | /* Note we removed one above */ | |
593 | *loff += size + 1; | |
594 | return size + 1; | |
595 | } | |
596 | ||
597 | static const struct file_operations recent_mt_fops = { | |
598 | .open = recent_seq_open, | |
599 | .read = seq_read, | |
600 | .write = recent_mt_proc_write, | |
601 | .release = seq_release_private, | |
602 | .owner = THIS_MODULE, | |
6038f373 | 603 | .llseek = seq_lseek, |
079aa88f | 604 | }; |
7d07d563 AD |
605 | |
606 | static int __net_init recent_proc_net_init(struct net *net) | |
607 | { | |
608 | struct recent_net *recent_net = recent_pernet(net); | |
609 | ||
610 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
611 | if (!recent_net->xt_recent) | |
612 | return -ENOMEM; | |
7d07d563 AD |
613 | return 0; |
614 | } | |
615 | ||
616 | static void __net_exit recent_proc_net_exit(struct net *net) | |
617 | { | |
7d07d563 AD |
618 | proc_net_remove(net, "xt_recent"); |
619 | } | |
620 | #else | |
621 | static inline int recent_proc_net_init(struct net *net) | |
622 | { | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static inline void recent_proc_net_exit(struct net *net) | |
627 | { | |
628 | } | |
1da177e4 | 629 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 630 | |
7d07d563 AD |
631 | static int __net_init recent_net_init(struct net *net) |
632 | { | |
633 | struct recent_net *recent_net = recent_pernet(net); | |
634 | ||
635 | INIT_LIST_HEAD(&recent_net->tables); | |
636 | return recent_proc_net_init(net); | |
637 | } | |
638 | ||
639 | static void __net_exit recent_net_exit(struct net *net) | |
640 | { | |
641 | struct recent_net *recent_net = recent_pernet(net); | |
642 | ||
643 | BUG_ON(!list_empty(&recent_net->tables)); | |
644 | recent_proc_net_exit(net); | |
645 | } | |
646 | ||
647 | static struct pernet_operations recent_net_ops = { | |
648 | .init = recent_net_init, | |
649 | .exit = recent_net_exit, | |
650 | .id = &recent_net_id, | |
651 | .size = sizeof(struct recent_net), | |
652 | }; | |
653 | ||
079aa88f JE |
654 | static struct xt_match recent_mt_reg[] __read_mostly = { |
655 | { | |
656 | .name = "recent", | |
657 | .revision = 0, | |
ee999d8b | 658 | .family = NFPROTO_IPV4, |
079aa88f JE |
659 | .match = recent_mt, |
660 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 | 661 | .checkentry = recent_mt_check_v0, |
079aa88f JE |
662 | .destroy = recent_mt_destroy, |
663 | .me = THIS_MODULE, | |
664 | }, | |
665 | { | |
666 | .name = "recent", | |
667 | .revision = 0, | |
ee999d8b | 668 | .family = NFPROTO_IPV6, |
079aa88f JE |
669 | .match = recent_mt, |
670 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 DF |
671 | .checkentry = recent_mt_check_v0, |
672 | .destroy = recent_mt_destroy, | |
673 | .me = THIS_MODULE, | |
674 | }, | |
675 | { | |
676 | .name = "recent", | |
677 | .revision = 1, | |
678 | .family = NFPROTO_IPV4, | |
679 | .match = recent_mt, | |
680 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
681 | .checkentry = recent_mt_check_v1, | |
079aa88f JE |
682 | .destroy = recent_mt_destroy, |
683 | .me = THIS_MODULE, | |
684 | }, | |
efdedd54 DF |
685 | { |
686 | .name = "recent", | |
687 | .revision = 1, | |
688 | .family = NFPROTO_IPV6, | |
689 | .match = recent_mt, | |
690 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
691 | .checkentry = recent_mt_check_v1, | |
692 | .destroy = recent_mt_destroy, | |
693 | .me = THIS_MODULE, | |
694 | } | |
1da177e4 LT |
695 | }; |
696 | ||
d3c5ee6d | 697 | static int __init recent_mt_init(void) |
1da177e4 | 698 | { |
404bdbfd | 699 | int err; |
1da177e4 | 700 | |
404bdbfd PM |
701 | if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255) |
702 | return -EINVAL; | |
703 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 704 | |
7d07d563 | 705 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 706 | if (err) |
404bdbfd | 707 | return err; |
7d07d563 AD |
708 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
709 | if (err) | |
710 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
711 | return err; |
712 | } | |
713 | ||
d3c5ee6d | 714 | static void __exit recent_mt_exit(void) |
1da177e4 | 715 | { |
079aa88f | 716 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 717 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
718 | } |
719 | ||
d3c5ee6d JE |
720 | module_init(recent_mt_init); |
721 | module_exit(recent_mt_exit); |