Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
404bdbfd PM |
2 | /* |
3 | * Copyright (c) 2006 Patrick McHardy <kaber@trash.net> | |
079aa88f | 4 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
404bdbfd | 5 | * |
404bdbfd PM |
6 | * This is a replacement of the old ipt_recent module, which carried the |
7 | * following copyright notice: | |
8 | * | |
9 | * Author: Stephen Frost <sfrost@snowman.net> | |
10 | * Copyright 2002-2003, Stephen Frost, 2.5.x port by laforge@netfilter.org | |
11 | */ | |
8bee4bad | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
404bdbfd | 13 | #include <linux/init.h> |
6709dbbb | 14 | #include <linux/ip.h> |
079aa88f JE |
15 | #include <linux/ipv6.h> |
16 | #include <linux/module.h> | |
404bdbfd | 17 | #include <linux/moduleparam.h> |
1da177e4 | 18 | #include <linux/proc_fs.h> |
404bdbfd PM |
19 | #include <linux/seq_file.h> |
20 | #include <linux/string.h> | |
1da177e4 | 21 | #include <linux/ctype.h> |
404bdbfd PM |
22 | #include <linux/list.h> |
23 | #include <linux/random.h> | |
24 | #include <linux/jhash.h> | |
25 | #include <linux/bitops.h> | |
26 | #include <linux/skbuff.h> | |
27 | #include <linux/inet.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
2727de76 | 29 | #include <linux/vmalloc.h> |
457c4cbc | 30 | #include <net/net_namespace.h> |
7d07d563 | 31 | #include <net/netns/generic.h> |
1da177e4 | 32 | |
6709dbbb | 33 | #include <linux/netfilter/x_tables.h> |
e948b20a | 34 | #include <linux/netfilter/xt_recent.h> |
1da177e4 | 35 | |
404bdbfd | 36 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
408ffaa4 | 37 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
06bf514e | 38 | MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching"); |
404bdbfd | 39 | MODULE_LICENSE("GPL"); |
e948b20a | 40 | MODULE_ALIAS("ipt_recent"); |
079aa88f | 41 | MODULE_ALIAS("ip6t_recent"); |
1da177e4 | 42 | |
abc86d0f FW |
43 | static unsigned int ip_list_tot __read_mostly = 100; |
44 | static unsigned int ip_list_hash_size __read_mostly; | |
45 | static unsigned int ip_list_perms __read_mostly = 0644; | |
46 | static unsigned int ip_list_uid __read_mostly; | |
47 | static unsigned int ip_list_gid __read_mostly; | |
e7be6994 | 48 | module_param(ip_list_tot, uint, 0400); |
e7be6994 PM |
49 | module_param(ip_list_hash_size, uint, 0400); |
50 | module_param(ip_list_perms, uint, 0400); | |
d6444062 JP |
51 | module_param(ip_list_uid, uint, 0644); |
52 | module_param(ip_list_gid, uint, 0644); | |
404bdbfd | 53 | MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list"); |
404bdbfd | 54 | MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs"); |
079aa88f | 55 | MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files"); |
5dc7a6d5 JE |
56 | MODULE_PARM_DESC(ip_list_uid, "default owner of /proc/net/xt_recent/* files"); |
57 | MODULE_PARM_DESC(ip_list_gid, "default owning group of /proc/net/xt_recent/* files"); | |
404bdbfd | 58 | |
abc86d0f FW |
59 | /* retained for backwards compatibility */ |
60 | static unsigned int ip_pkt_list_tot __read_mostly; | |
61 | module_param(ip_pkt_list_tot, uint, 0400); | |
62 | MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)"); | |
63 | ||
64 | #define XT_RECENT_MAX_NSTAMPS 256 | |
65 | ||
404bdbfd PM |
66 | struct recent_entry { |
67 | struct list_head list; | |
68 | struct list_head lru_list; | |
079aa88f JE |
69 | union nf_inet_addr addr; |
70 | u_int16_t family; | |
404bdbfd PM |
71 | u_int8_t ttl; |
72 | u_int8_t index; | |
73 | u_int16_t nstamps; | |
74 | unsigned long stamps[0]; | |
1da177e4 LT |
75 | }; |
76 | ||
404bdbfd PM |
77 | struct recent_table { |
78 | struct list_head list; | |
e948b20a | 79 | char name[XT_RECENT_NAME_LEN]; |
efdedd54 | 80 | union nf_inet_addr mask; |
404bdbfd PM |
81 | unsigned int refcnt; |
82 | unsigned int entries; | |
abc86d0f | 83 | u8 nstamps_max_mask; |
404bdbfd PM |
84 | struct list_head lru_list; |
85 | struct list_head iphash[0]; | |
1da177e4 LT |
86 | }; |
87 | ||
7d07d563 AD |
88 | struct recent_net { |
89 | struct list_head tables; | |
90 | #ifdef CONFIG_PROC_FS | |
91 | struct proc_dir_entry *xt_recent; | |
7d07d563 AD |
92 | #endif |
93 | }; | |
94 | ||
c7d03a00 | 95 | static unsigned int recent_net_id __read_mostly; |
abc86d0f | 96 | |
7d07d563 AD |
97 | static inline struct recent_net *recent_pernet(struct net *net) |
98 | { | |
99 | return net_generic(net, recent_net_id); | |
100 | } | |
101 | ||
1da177e4 | 102 | static DEFINE_SPINLOCK(recent_lock); |
a0e889bb | 103 | static DEFINE_MUTEX(recent_mutex); |
1da177e4 LT |
104 | |
105 | #ifdef CONFIG_PROC_FS | |
3754b87a | 106 | static const struct file_operations recent_mt_fops; |
1da177e4 LT |
107 | #endif |
108 | ||
294188ae | 109 | static u_int32_t hash_rnd __read_mostly; |
079aa88f | 110 | |
294188ae | 111 | static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr) |
079aa88f | 112 | { |
079aa88f JE |
113 | return jhash_1word((__force u32)addr->ip, hash_rnd) & |
114 | (ip_list_hash_size - 1); | |
115 | } | |
1da177e4 | 116 | |
294188ae | 117 | static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr) |
1da177e4 | 118 | { |
079aa88f JE |
119 | return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) & |
120 | (ip_list_hash_size - 1); | |
1da177e4 LT |
121 | } |
122 | ||
404bdbfd | 123 | static struct recent_entry * |
079aa88f JE |
124 | recent_entry_lookup(const struct recent_table *table, |
125 | const union nf_inet_addr *addrp, u_int16_t family, | |
126 | u_int8_t ttl) | |
1da177e4 | 127 | { |
404bdbfd PM |
128 | struct recent_entry *e; |
129 | unsigned int h; | |
130 | ||
ee999d8b | 131 | if (family == NFPROTO_IPV4) |
079aa88f JE |
132 | h = recent_entry_hash4(addrp); |
133 | else | |
134 | h = recent_entry_hash6(addrp); | |
135 | ||
404bdbfd | 136 | list_for_each_entry(e, &table->iphash[h], list) |
079aa88f JE |
137 | if (e->family == family && |
138 | memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 && | |
139 | (ttl == e->ttl || ttl == 0 || e->ttl == 0)) | |
404bdbfd PM |
140 | return e; |
141 | return NULL; | |
142 | } | |
1da177e4 | 143 | |
404bdbfd PM |
144 | static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) |
145 | { | |
146 | list_del(&e->list); | |
147 | list_del(&e->lru_list); | |
148 | kfree(e); | |
149 | t->entries--; | |
150 | } | |
1da177e4 | 151 | |
0079c5ae TG |
152 | /* |
153 | * Drop entries with timestamps older then 'time'. | |
154 | */ | |
155 | static void recent_entry_reap(struct recent_table *t, unsigned long time) | |
156 | { | |
157 | struct recent_entry *e; | |
158 | ||
159 | /* | |
160 | * The head of the LRU list is always the oldest entry. | |
161 | */ | |
162 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
163 | ||
164 | /* | |
165 | * The last time stamp is the most recent. | |
166 | */ | |
167 | if (time_after(time, e->stamps[e->index-1])) | |
168 | recent_entry_remove(t, e); | |
169 | } | |
170 | ||
404bdbfd | 171 | static struct recent_entry * |
079aa88f JE |
172 | recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, |
173 | u_int16_t family, u_int8_t ttl) | |
404bdbfd PM |
174 | { |
175 | struct recent_entry *e; | |
abc86d0f | 176 | unsigned int nstamps_max = t->nstamps_max_mask; |
1da177e4 | 177 | |
404bdbfd PM |
178 | if (t->entries >= ip_list_tot) { |
179 | e = list_entry(t->lru_list.next, struct recent_entry, lru_list); | |
180 | recent_entry_remove(t, e); | |
1da177e4 | 181 | } |
abc86d0f FW |
182 | |
183 | nstamps_max += 1; | |
acafe7e3 | 184 | e = kmalloc(struct_size(e, stamps, nstamps_max), GFP_ATOMIC); |
404bdbfd PM |
185 | if (e == NULL) |
186 | return NULL; | |
079aa88f | 187 | memcpy(&e->addr, addr, sizeof(e->addr)); |
404bdbfd PM |
188 | e->ttl = ttl; |
189 | e->stamps[0] = jiffies; | |
190 | e->nstamps = 1; | |
191 | e->index = 1; | |
079aa88f | 192 | e->family = family; |
ee999d8b | 193 | if (family == NFPROTO_IPV4) |
079aa88f JE |
194 | list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]); |
195 | else | |
196 | list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]); | |
404bdbfd PM |
197 | list_add_tail(&e->lru_list, &t->lru_list); |
198 | t->entries++; | |
199 | return e; | |
200 | } | |
1da177e4 | 201 | |
404bdbfd PM |
202 | static void recent_entry_update(struct recent_table *t, struct recent_entry *e) |
203 | { | |
abc86d0f | 204 | e->index &= t->nstamps_max_mask; |
404bdbfd PM |
205 | e->stamps[e->index++] = jiffies; |
206 | if (e->index > e->nstamps) | |
207 | e->nstamps = e->index; | |
404bdbfd PM |
208 | list_move_tail(&e->lru_list, &t->lru_list); |
209 | } | |
1da177e4 | 210 | |
7d07d563 AD |
211 | static struct recent_table *recent_table_lookup(struct recent_net *recent_net, |
212 | const char *name) | |
404bdbfd PM |
213 | { |
214 | struct recent_table *t; | |
1da177e4 | 215 | |
7d07d563 | 216 | list_for_each_entry(t, &recent_net->tables, list) |
404bdbfd PM |
217 | if (!strcmp(t->name, name)) |
218 | return t; | |
219 | return NULL; | |
220 | } | |
1da177e4 | 221 | |
404bdbfd PM |
222 | static void recent_table_flush(struct recent_table *t) |
223 | { | |
224 | struct recent_entry *e, *next; | |
225 | unsigned int i; | |
1da177e4 | 226 | |
7c4e36bc | 227 | for (i = 0; i < ip_list_hash_size; i++) |
404bdbfd PM |
228 | list_for_each_entry_safe(e, next, &t->iphash[i], list) |
229 | recent_entry_remove(t, e); | |
1da177e4 LT |
230 | } |
231 | ||
1d93a9cb | 232 | static bool |
62fc8051 | 233 | recent_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 234 | { |
613dbd95 | 235 | struct net *net = xt_net(par); |
7d07d563 | 236 | struct recent_net *recent_net = recent_pernet(net); |
efdedd54 | 237 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd PM |
238 | struct recent_table *t; |
239 | struct recent_entry *e; | |
efdedd54 | 240 | union nf_inet_addr addr = {}, addr_mask; |
404bdbfd | 241 | u_int8_t ttl; |
1d93a9cb | 242 | bool ret = info->invert; |
1da177e4 | 243 | |
613dbd95 | 244 | if (xt_family(par) == NFPROTO_IPV4) { |
079aa88f JE |
245 | const struct iphdr *iph = ip_hdr(skb); |
246 | ||
247 | if (info->side == XT_RECENT_DEST) | |
248 | addr.ip = iph->daddr; | |
249 | else | |
250 | addr.ip = iph->saddr; | |
251 | ||
252 | ttl = iph->ttl; | |
253 | } else { | |
254 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
255 | ||
256 | if (info->side == XT_RECENT_DEST) | |
257 | memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6)); | |
258 | else | |
259 | memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6)); | |
260 | ||
261 | ttl = iph->hop_limit; | |
262 | } | |
1da177e4 | 263 | |
404bdbfd | 264 | /* use TTL as seen before forwarding */ |
f5646501 FL |
265 | if (xt_out(par) != NULL && |
266 | (!skb->sk || !net_eq(net, sock_net(skb->sk)))) | |
404bdbfd | 267 | ttl++; |
1da177e4 | 268 | |
1da177e4 | 269 | spin_lock_bh(&recent_lock); |
7d07d563 | 270 | t = recent_table_lookup(recent_net, info->name); |
efdedd54 DF |
271 | |
272 | nf_inet_addr_mask(&addr, &addr_mask, &t->mask); | |
273 | ||
613dbd95 | 274 | e = recent_entry_lookup(t, &addr_mask, xt_family(par), |
079aa88f | 275 | (info->check_set & XT_RECENT_TTL) ? ttl : 0); |
404bdbfd | 276 | if (e == NULL) { |
e948b20a | 277 | if (!(info->check_set & XT_RECENT_SET)) |
404bdbfd | 278 | goto out; |
613dbd95 | 279 | e = recent_entry_init(t, &addr_mask, xt_family(par), ttl); |
404bdbfd | 280 | if (e == NULL) |
b4ba2611 | 281 | par->hotdrop = true; |
1d93a9cb | 282 | ret = !ret; |
404bdbfd | 283 | goto out; |
1da177e4 LT |
284 | } |
285 | ||
e948b20a | 286 | if (info->check_set & XT_RECENT_SET) |
1d93a9cb | 287 | ret = !ret; |
e948b20a | 288 | else if (info->check_set & XT_RECENT_REMOVE) { |
404bdbfd | 289 | recent_entry_remove(t, e); |
1d93a9cb | 290 | ret = !ret; |
e948b20a | 291 | } else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) { |
855304af | 292 | unsigned long time = jiffies - info->seconds * HZ; |
404bdbfd PM |
293 | unsigned int i, hits = 0; |
294 | ||
295 | for (i = 0; i < e->nstamps; i++) { | |
855304af | 296 | if (info->seconds && time_after(time, e->stamps[i])) |
404bdbfd | 297 | continue; |
ef169150 | 298 | if (!info->hit_count || ++hits >= info->hit_count) { |
1d93a9cb | 299 | ret = !ret; |
404bdbfd | 300 | break; |
1da177e4 | 301 | } |
1da177e4 | 302 | } |
0079c5ae TG |
303 | |
304 | /* info->seconds must be non-zero */ | |
305 | if (info->check_set & XT_RECENT_REAP) | |
306 | recent_entry_reap(t, time); | |
1da177e4 LT |
307 | } |
308 | ||
e948b20a JE |
309 | if (info->check_set & XT_RECENT_SET || |
310 | (info->check_set & XT_RECENT_UPDATE && ret)) { | |
404bdbfd PM |
311 | recent_entry_update(t, e); |
312 | e->ttl = ttl; | |
313 | } | |
314 | out: | |
315 | spin_unlock_bh(&recent_lock); | |
316 | return ret; | |
1da177e4 LT |
317 | } |
318 | ||
2727de76 ED |
319 | static void recent_table_free(void *addr) |
320 | { | |
4cb28970 | 321 | kvfree(addr); |
2727de76 ED |
322 | } |
323 | ||
efdedd54 DF |
324 | static int recent_mt_check(const struct xt_mtchk_param *par, |
325 | const struct xt_recent_mtinfo_v1 *info) | |
1da177e4 | 326 | { |
7d07d563 | 327 | struct recent_net *recent_net = recent_pernet(par->net); |
404bdbfd | 328 | struct recent_table *t; |
b0ceb560 AD |
329 | #ifdef CONFIG_PROC_FS |
330 | struct proc_dir_entry *pde; | |
da742808 EB |
331 | kuid_t uid; |
332 | kgid_t gid; | |
b0ceb560 | 333 | #endif |
abc86d0f | 334 | unsigned int nstamp_mask; |
95c96174 | 335 | unsigned int i; |
bd414ee6 | 336 | int ret = -EINVAL; |
1da177e4 | 337 | |
7bdc6624 GF |
338 | net_get_random_once(&hash_rnd, sizeof(hash_rnd)); |
339 | ||
606a9a02 | 340 | if (info->check_set & ~XT_RECENT_VALID_FLAGS) { |
b2606644 FW |
341 | pr_info_ratelimited("Unsupported userspace flags (%08x)\n", |
342 | info->check_set); | |
bd414ee6 | 343 | return -EINVAL; |
606a9a02 | 344 | } |
404bdbfd | 345 | if (hweight8(info->check_set & |
e948b20a JE |
346 | (XT_RECENT_SET | XT_RECENT_REMOVE | |
347 | XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1) | |
bd414ee6 | 348 | return -EINVAL; |
e948b20a | 349 | if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) && |
0079c5ae TG |
350 | (info->seconds || info->hit_count || |
351 | (info->check_set & XT_RECENT_MODIFIERS))) | |
bd414ee6 | 352 | return -EINVAL; |
0079c5ae | 353 | if ((info->check_set & XT_RECENT_REAP) && !info->seconds) |
bd414ee6 | 354 | return -EINVAL; |
abc86d0f | 355 | if (info->hit_count >= XT_RECENT_MAX_NSTAMPS) { |
b2606644 FW |
356 | pr_info_ratelimited("hitcount (%u) is larger than allowed maximum (%u)\n", |
357 | info->hit_count, XT_RECENT_MAX_NSTAMPS - 1); | |
bd414ee6 | 358 | return -EINVAL; |
98e6d2d5 | 359 | } |
b1d0a5d0 FW |
360 | ret = xt_check_proc_name(info->name, sizeof(info->name)); |
361 | if (ret) | |
362 | return ret; | |
1da177e4 | 363 | |
abc86d0f FW |
364 | if (ip_pkt_list_tot && info->hit_count < ip_pkt_list_tot) |
365 | nstamp_mask = roundup_pow_of_two(ip_pkt_list_tot) - 1; | |
366 | else if (info->hit_count) | |
367 | nstamp_mask = roundup_pow_of_two(info->hit_count) - 1; | |
368 | else | |
369 | nstamp_mask = 32 - 1; | |
370 | ||
a0e889bb | 371 | mutex_lock(&recent_mutex); |
7d07d563 | 372 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 373 | if (t != NULL) { |
cef9ed86 FW |
374 | if (nstamp_mask > t->nstamps_max_mask) { |
375 | spin_lock_bh(&recent_lock); | |
376 | recent_table_flush(t); | |
377 | t->nstamps_max_mask = nstamp_mask; | |
378 | spin_unlock_bh(&recent_lock); | |
abc86d0f FW |
379 | } |
380 | ||
404bdbfd | 381 | t->refcnt++; |
bd414ee6 | 382 | ret = 0; |
404bdbfd | 383 | goto out; |
1da177e4 LT |
384 | } |
385 | ||
6ca64ef3 | 386 | t = kvzalloc(struct_size(t, iphash, ip_list_hash_size), GFP_KERNEL); |
4a5a5c73 JE |
387 | if (t == NULL) { |
388 | ret = -ENOMEM; | |
404bdbfd | 389 | goto out; |
4a5a5c73 | 390 | } |
2b2283d0 | 391 | t->refcnt = 1; |
abc86d0f | 392 | t->nstamps_max_mask = nstamp_mask; |
efdedd54 DF |
393 | |
394 | memcpy(&t->mask, &info->mask, sizeof(t->mask)); | |
404bdbfd PM |
395 | strcpy(t->name, info->name); |
396 | INIT_LIST_HEAD(&t->lru_list); | |
397 | for (i = 0; i < ip_list_hash_size; i++) | |
398 | INIT_LIST_HEAD(&t->iphash[i]); | |
399 | #ifdef CONFIG_PROC_FS | |
da742808 EB |
400 | uid = make_kuid(&init_user_ns, ip_list_uid); |
401 | gid = make_kgid(&init_user_ns, ip_list_gid); | |
402 | if (!uid_valid(uid) || !gid_valid(gid)) { | |
2727de76 | 403 | recent_table_free(t); |
da742808 EB |
404 | ret = -EINVAL; |
405 | goto out; | |
406 | } | |
7d07d563 | 407 | pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent, |
b09eec16 | 408 | &recent_mt_fops, t); |
b0ceb560 | 409 | if (pde == NULL) { |
2727de76 | 410 | recent_table_free(t); |
4a5a5c73 | 411 | ret = -ENOMEM; |
404bdbfd | 412 | goto out; |
1da177e4 | 413 | } |
271a15ea | 414 | proc_set_user(pde, uid, gid); |
1da177e4 | 415 | #endif |
a0e889bb | 416 | spin_lock_bh(&recent_lock); |
7d07d563 | 417 | list_add_tail(&t->list, &recent_net->tables); |
a0e889bb | 418 | spin_unlock_bh(&recent_lock); |
bd414ee6 | 419 | ret = 0; |
404bdbfd | 420 | out: |
a0e889bb | 421 | mutex_unlock(&recent_mutex); |
404bdbfd PM |
422 | return ret; |
423 | } | |
1da177e4 | 424 | |
efdedd54 DF |
425 | static int recent_mt_check_v0(const struct xt_mtchk_param *par) |
426 | { | |
427 | const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo; | |
428 | struct xt_recent_mtinfo_v1 info_v1; | |
429 | ||
430 | /* Copy revision 0 structure to revision 1 */ | |
431 | memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo)); | |
432 | /* Set default mask to ensure backward compatible behaviour */ | |
433 | memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all)); | |
434 | ||
435 | return recent_mt_check(par, &info_v1); | |
436 | } | |
437 | ||
438 | static int recent_mt_check_v1(const struct xt_mtchk_param *par) | |
439 | { | |
440 | return recent_mt_check(par, par->matchinfo); | |
441 | } | |
442 | ||
6be3d859 | 443 | static void recent_mt_destroy(const struct xt_mtdtor_param *par) |
404bdbfd | 444 | { |
7d07d563 | 445 | struct recent_net *recent_net = recent_pernet(par->net); |
efdedd54 | 446 | const struct xt_recent_mtinfo_v1 *info = par->matchinfo; |
404bdbfd | 447 | struct recent_table *t; |
1da177e4 | 448 | |
a0e889bb | 449 | mutex_lock(&recent_mutex); |
7d07d563 | 450 | t = recent_table_lookup(recent_net, info->name); |
404bdbfd | 451 | if (--t->refcnt == 0) { |
a0e889bb | 452 | spin_lock_bh(&recent_lock); |
404bdbfd | 453 | list_del(&t->list); |
a0e889bb | 454 | spin_unlock_bh(&recent_lock); |
404bdbfd | 455 | #ifdef CONFIG_PROC_FS |
665e205c VL |
456 | if (recent_net->xt_recent != NULL) |
457 | remove_proc_entry(t->name, recent_net->xt_recent); | |
1da177e4 | 458 | #endif |
a8ddc916 | 459 | recent_table_flush(t); |
2727de76 | 460 | recent_table_free(t); |
1da177e4 | 461 | } |
a0e889bb | 462 | mutex_unlock(&recent_mutex); |
404bdbfd | 463 | } |
1da177e4 | 464 | |
404bdbfd PM |
465 | #ifdef CONFIG_PROC_FS |
466 | struct recent_iter_state { | |
079aa88f | 467 | const struct recent_table *table; |
404bdbfd PM |
468 | unsigned int bucket; |
469 | }; | |
1da177e4 | 470 | |
404bdbfd | 471 | static void *recent_seq_start(struct seq_file *seq, loff_t *pos) |
855304af | 472 | __acquires(recent_lock) |
404bdbfd PM |
473 | { |
474 | struct recent_iter_state *st = seq->private; | |
a47362a2 | 475 | const struct recent_table *t = st->table; |
404bdbfd PM |
476 | struct recent_entry *e; |
477 | loff_t p = *pos; | |
1da177e4 | 478 | |
1da177e4 | 479 | spin_lock_bh(&recent_lock); |
1da177e4 | 480 | |
7c4e36bc JE |
481 | for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++) |
482 | list_for_each_entry(e, &t->iphash[st->bucket], list) | |
404bdbfd PM |
483 | if (p-- == 0) |
484 | return e; | |
404bdbfd PM |
485 | return NULL; |
486 | } | |
1da177e4 | 487 | |
404bdbfd PM |
488 | static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
489 | { | |
490 | struct recent_iter_state *st = seq->private; | |
3cf93c96 | 491 | const struct recent_table *t = st->table; |
079aa88f JE |
492 | const struct recent_entry *e = v; |
493 | const struct list_head *head = e->list.next; | |
404bdbfd PM |
494 | |
495 | while (head == &t->iphash[st->bucket]) { | |
496 | if (++st->bucket >= ip_list_hash_size) | |
497 | return NULL; | |
498 | head = t->iphash[st->bucket].next; | |
499 | } | |
500 | (*pos)++; | |
501 | return list_entry(head, struct recent_entry, list); | |
1da177e4 LT |
502 | } |
503 | ||
404bdbfd | 504 | static void recent_seq_stop(struct seq_file *s, void *v) |
855304af | 505 | __releases(recent_lock) |
1da177e4 | 506 | { |
404bdbfd PM |
507 | spin_unlock_bh(&recent_lock); |
508 | } | |
1da177e4 | 509 | |
404bdbfd PM |
510 | static int recent_seq_show(struct seq_file *seq, void *v) |
511 | { | |
3cf93c96 | 512 | const struct recent_entry *e = v; |
abc86d0f FW |
513 | struct recent_iter_state *st = seq->private; |
514 | const struct recent_table *t = st->table; | |
404bdbfd PM |
515 | unsigned int i; |
516 | ||
abc86d0f FW |
517 | i = (e->index - 1) & t->nstamps_max_mask; |
518 | ||
ee999d8b | 519 | if (e->family == NFPROTO_IPV4) |
14d5e834 HH |
520 | seq_printf(seq, "src=%pI4 ttl: %u last_seen: %lu oldest_pkt: %u", |
521 | &e->addr.ip, e->ttl, e->stamps[i], e->index); | |
079aa88f | 522 | else |
5b095d98 | 523 | seq_printf(seq, "src=%pI6 ttl: %u last_seen: %lu oldest_pkt: %u", |
38ff4fa4 | 524 | &e->addr.in6, e->ttl, e->stamps[i], e->index); |
404bdbfd PM |
525 | for (i = 0; i < e->nstamps; i++) |
526 | seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]); | |
cdec2685 | 527 | seq_putc(seq, '\n'); |
404bdbfd PM |
528 | return 0; |
529 | } | |
1da177e4 | 530 | |
56b3d975 | 531 | static const struct seq_operations recent_seq_ops = { |
404bdbfd PM |
532 | .start = recent_seq_start, |
533 | .next = recent_seq_next, | |
534 | .stop = recent_seq_stop, | |
535 | .show = recent_seq_show, | |
536 | }; | |
1da177e4 | 537 | |
404bdbfd PM |
538 | static int recent_seq_open(struct inode *inode, struct file *file) |
539 | { | |
404bdbfd | 540 | struct recent_iter_state *st; |
404bdbfd | 541 | |
e2da5913 | 542 | st = __seq_open_private(file, &recent_seq_ops, sizeof(*st)); |
404bdbfd PM |
543 | if (st == NULL) |
544 | return -ENOMEM; | |
3af8e31c | 545 | |
d9dda78b | 546 | st->table = PDE_DATA(inode); |
e2da5913 | 547 | return 0; |
404bdbfd | 548 | } |
1da177e4 | 549 | |
079aa88f JE |
550 | static ssize_t |
551 | recent_mt_proc_write(struct file *file, const char __user *input, | |
552 | size_t size, loff_t *loff) | |
553 | { | |
d9dda78b | 554 | struct recent_table *t = PDE_DATA(file_inode(file)); |
079aa88f JE |
555 | struct recent_entry *e; |
556 | char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")]; | |
557 | const char *c = buf; | |
325fb5b4 | 558 | union nf_inet_addr addr = {}; |
079aa88f JE |
559 | u_int16_t family; |
560 | bool add, succ; | |
561 | ||
562 | if (size == 0) | |
563 | return 0; | |
564 | if (size > sizeof(buf)) | |
565 | size = sizeof(buf); | |
566 | if (copy_from_user(buf, input, size) != 0) | |
567 | return -EFAULT; | |
568 | ||
569 | /* Strict protocol! */ | |
570 | if (*loff != 0) | |
571 | return -ESPIPE; | |
572 | switch (*c) { | |
573 | case '/': /* flush table */ | |
574 | spin_lock_bh(&recent_lock); | |
575 | recent_table_flush(t); | |
576 | spin_unlock_bh(&recent_lock); | |
577 | return size; | |
578 | case '-': /* remove address */ | |
579 | add = false; | |
580 | break; | |
581 | case '+': /* add address */ | |
582 | add = true; | |
583 | break; | |
584 | default: | |
b2606644 | 585 | pr_info_ratelimited("Need \"+ip\", \"-ip\" or \"/\"\n"); |
079aa88f JE |
586 | return -EINVAL; |
587 | } | |
588 | ||
589 | ++c; | |
590 | --size; | |
591 | if (strnchr(c, size, ':') != NULL) { | |
ee999d8b | 592 | family = NFPROTO_IPV6; |
079aa88f JE |
593 | succ = in6_pton(c, size, (void *)&addr, '\n', NULL); |
594 | } else { | |
ee999d8b | 595 | family = NFPROTO_IPV4; |
079aa88f JE |
596 | succ = in4_pton(c, size, (void *)&addr, '\n', NULL); |
597 | } | |
598 | ||
b2606644 | 599 | if (!succ) |
079aa88f | 600 | return -EINVAL; |
079aa88f JE |
601 | |
602 | spin_lock_bh(&recent_lock); | |
603 | e = recent_entry_lookup(t, &addr, family, 0); | |
604 | if (e == NULL) { | |
605 | if (add) | |
606 | recent_entry_init(t, &addr, family, 0); | |
607 | } else { | |
608 | if (add) | |
609 | recent_entry_update(t, e); | |
610 | else | |
611 | recent_entry_remove(t, e); | |
612 | } | |
613 | spin_unlock_bh(&recent_lock); | |
614 | /* Note we removed one above */ | |
615 | *loff += size + 1; | |
616 | return size + 1; | |
617 | } | |
618 | ||
619 | static const struct file_operations recent_mt_fops = { | |
620 | .open = recent_seq_open, | |
621 | .read = seq_read, | |
622 | .write = recent_mt_proc_write, | |
623 | .release = seq_release_private, | |
624 | .owner = THIS_MODULE, | |
6038f373 | 625 | .llseek = seq_lseek, |
079aa88f | 626 | }; |
7d07d563 AD |
627 | |
628 | static int __net_init recent_proc_net_init(struct net *net) | |
629 | { | |
630 | struct recent_net *recent_net = recent_pernet(net); | |
631 | ||
632 | recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net); | |
633 | if (!recent_net->xt_recent) | |
634 | return -ENOMEM; | |
7d07d563 AD |
635 | return 0; |
636 | } | |
637 | ||
638 | static void __net_exit recent_proc_net_exit(struct net *net) | |
639 | { | |
665e205c VL |
640 | struct recent_net *recent_net = recent_pernet(net); |
641 | struct recent_table *t; | |
642 | ||
643 | /* recent_net_exit() is called before recent_mt_destroy(). Make sure | |
644 | * that the parent xt_recent proc entry is is empty before trying to | |
645 | * remove it. | |
646 | */ | |
647 | spin_lock_bh(&recent_lock); | |
648 | list_for_each_entry(t, &recent_net->tables, list) | |
649 | remove_proc_entry(t->name, recent_net->xt_recent); | |
650 | ||
651 | recent_net->xt_recent = NULL; | |
652 | spin_unlock_bh(&recent_lock); | |
653 | ||
ece31ffd | 654 | remove_proc_entry("xt_recent", net->proc_net); |
7d07d563 AD |
655 | } |
656 | #else | |
657 | static inline int recent_proc_net_init(struct net *net) | |
658 | { | |
659 | return 0; | |
660 | } | |
661 | ||
662 | static inline void recent_proc_net_exit(struct net *net) | |
663 | { | |
664 | } | |
1da177e4 | 665 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 666 | |
7d07d563 AD |
667 | static int __net_init recent_net_init(struct net *net) |
668 | { | |
669 | struct recent_net *recent_net = recent_pernet(net); | |
670 | ||
671 | INIT_LIST_HEAD(&recent_net->tables); | |
672 | return recent_proc_net_init(net); | |
673 | } | |
674 | ||
675 | static void __net_exit recent_net_exit(struct net *net) | |
676 | { | |
7d07d563 AD |
677 | recent_proc_net_exit(net); |
678 | } | |
679 | ||
680 | static struct pernet_operations recent_net_ops = { | |
681 | .init = recent_net_init, | |
682 | .exit = recent_net_exit, | |
683 | .id = &recent_net_id, | |
684 | .size = sizeof(struct recent_net), | |
685 | }; | |
686 | ||
079aa88f JE |
687 | static struct xt_match recent_mt_reg[] __read_mostly = { |
688 | { | |
689 | .name = "recent", | |
690 | .revision = 0, | |
ee999d8b | 691 | .family = NFPROTO_IPV4, |
079aa88f JE |
692 | .match = recent_mt, |
693 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 | 694 | .checkentry = recent_mt_check_v0, |
079aa88f JE |
695 | .destroy = recent_mt_destroy, |
696 | .me = THIS_MODULE, | |
697 | }, | |
698 | { | |
699 | .name = "recent", | |
700 | .revision = 0, | |
ee999d8b | 701 | .family = NFPROTO_IPV6, |
079aa88f JE |
702 | .match = recent_mt, |
703 | .matchsize = sizeof(struct xt_recent_mtinfo), | |
efdedd54 DF |
704 | .checkentry = recent_mt_check_v0, |
705 | .destroy = recent_mt_destroy, | |
706 | .me = THIS_MODULE, | |
707 | }, | |
708 | { | |
709 | .name = "recent", | |
710 | .revision = 1, | |
711 | .family = NFPROTO_IPV4, | |
712 | .match = recent_mt, | |
713 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
714 | .checkentry = recent_mt_check_v1, | |
079aa88f JE |
715 | .destroy = recent_mt_destroy, |
716 | .me = THIS_MODULE, | |
717 | }, | |
efdedd54 DF |
718 | { |
719 | .name = "recent", | |
720 | .revision = 1, | |
721 | .family = NFPROTO_IPV6, | |
722 | .match = recent_mt, | |
723 | .matchsize = sizeof(struct xt_recent_mtinfo_v1), | |
724 | .checkentry = recent_mt_check_v1, | |
725 | .destroy = recent_mt_destroy, | |
726 | .me = THIS_MODULE, | |
727 | } | |
1da177e4 LT |
728 | }; |
729 | ||
d3c5ee6d | 730 | static int __init recent_mt_init(void) |
1da177e4 | 731 | { |
404bdbfd | 732 | int err; |
1da177e4 | 733 | |
abc86d0f FW |
734 | BUILD_BUG_ON_NOT_POWER_OF_2(XT_RECENT_MAX_NSTAMPS); |
735 | ||
736 | if (!ip_list_tot || ip_pkt_list_tot >= XT_RECENT_MAX_NSTAMPS) | |
404bdbfd PM |
737 | return -EINVAL; |
738 | ip_list_hash_size = 1 << fls(ip_list_tot); | |
1da177e4 | 739 | |
7d07d563 | 740 | err = register_pernet_subsys(&recent_net_ops); |
1da177e4 | 741 | if (err) |
404bdbfd | 742 | return err; |
7d07d563 AD |
743 | err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
744 | if (err) | |
745 | unregister_pernet_subsys(&recent_net_ops); | |
1da177e4 LT |
746 | return err; |
747 | } | |
748 | ||
d3c5ee6d | 749 | static void __exit recent_mt_exit(void) |
1da177e4 | 750 | { |
079aa88f | 751 | xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg)); |
7d07d563 | 752 | unregister_pernet_subsys(&recent_net_ops); |
1da177e4 LT |
753 | } |
754 | ||
d3c5ee6d JE |
755 | module_init(recent_mt_init); |
756 | module_exit(recent_mt_exit); |