This file is indexed.

/usr/src/xtables-addons-2.10/extensions/xt_geoip.c is in xtables-addons-dkms 2.10-1build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
/* iptables kernel module for the geoip match
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Copyright (c) 2004, 2005, 2006, 2007, 2008
 * Samuel Jean & Nicolas Bouliane
 */
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/version.h>
#include <linux/vmalloc.h>
#include <linux/netfilter/x_tables.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include "xt_geoip.h"
#include "compat_xtables.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Bouliane");
MODULE_AUTHOR("Samuel Jean");
MODULE_DESCRIPTION("xtables module for geoip match");
MODULE_ALIAS("ip6t_geoip");
MODULE_ALIAS("ipt_geoip");

enum geoip_proto {
	GEOIPROTO_IPV6,
	GEOIPROTO_IPV4,
	__GEOIPROTO_MAX,
};

/**
 * @list:	anchor point for geoip_head
 * @subnets:	packed ordered list of ranges (either v6 or v4)
 * @count:	number of ranges
 * @cc:		country code
 */
struct geoip_country_kernel {
	struct list_head list;
	void *subnets;
	atomic_t ref;
	unsigned int count;
	unsigned short cc;
};

static struct list_head geoip_head[__GEOIPROTO_MAX];
static DEFINE_SPINLOCK(geoip_lock);

static const enum geoip_proto nfp2geo[] = {
	[NFPROTO_IPV6] = GEOIPROTO_IPV6,
	[NFPROTO_IPV4] = GEOIPROTO_IPV4,
};
static const size_t geoproto_size[] = {
	[GEOIPROTO_IPV6] = sizeof(struct geoip_subnet6),
	[GEOIPROTO_IPV4] = sizeof(struct geoip_subnet4),
};

static struct geoip_country_kernel *
geoip_add_node(const struct geoip_country_user __user *umem_ptr,
               enum geoip_proto proto)
{
	struct geoip_country_user umem;
	struct geoip_country_kernel *p;
	size_t size;
	void *subnet;
	int ret;

	if (copy_from_user(&umem, umem_ptr, sizeof(umem)) != 0)
		return ERR_PTR(-EFAULT);

	p = kmalloc(sizeof(struct geoip_country_kernel), GFP_KERNEL);
	if (p == NULL)
		return ERR_PTR(-ENOMEM);

	p->count   = umem.count;
	p->cc      = umem.cc;
	size = p->count * geoproto_size[proto];
	if (size == 0) {
		/*
		 * Believe it or not, vmalloc prints a warning to dmesg for
		 * zero-sized allocations :-/
		 */
		subnet = NULL;
	} else {
		subnet = vmalloc(size);
		if (subnet == NULL) {
			ret = -ENOMEM;
			goto free_p;
		}
	}
	if (copy_from_user(subnet,
	    (const void __user *)(unsigned long)umem.subnets, size) != 0) {
		ret = -EFAULT;
		goto free_s;
	}

	p->subnets = subnet;
	atomic_set(&p->ref, 1);
	INIT_LIST_HEAD(&p->list);

	spin_lock(&geoip_lock);
	list_add_tail_rcu(&p->list, &geoip_head[proto]);
	spin_unlock(&geoip_lock);

	return p;

 free_s:
	vfree(subnet);
 free_p:
	kfree(p);
	return ERR_PTR(ret);
}

static void geoip_try_remove_node(struct geoip_country_kernel *p)
{
	spin_lock(&geoip_lock);
	if (!atomic_dec_and_test(&p->ref)) {
		spin_unlock(&geoip_lock);
		return;
	}

	/* So now am unlinked or the only one alive, right ?
	 * What are you waiting ? Free up some memory!
	 */
	list_del_rcu(&p->list);
	spin_unlock(&geoip_lock);

	synchronize_rcu();
	vfree(p->subnets);
	kfree(p);
}

static struct geoip_country_kernel *find_node(unsigned short cc,
    enum geoip_proto proto)
{
	struct geoip_country_kernel *p;
	spin_lock(&geoip_lock);

	list_for_each_entry_rcu(p, &geoip_head[proto], list)
		if (p->cc == cc) {
			atomic_inc(&p->ref);
			spin_unlock(&geoip_lock);
			return p;
		}

	spin_unlock(&geoip_lock);
	return NULL;
}

static inline int
ipv6_cmp(const struct in6_addr *p, const struct in6_addr *q)
{
	unsigned int i;

	for (i = 0; i < 4; ++i) {
		if (p->s6_addr32[i] < q->s6_addr32[i])
			return -1;
		else if (p->s6_addr32[i] > q->s6_addr32[i])
			return 1;
	}

	return 0;
}

static bool geoip_bsearch6(const struct geoip_subnet6 *range,
    const struct in6_addr *addr, int lo, int hi)
{
	int mid;

	while (true) {
		if (hi <= lo)
			return false;
		mid = (lo + hi) / 2;
		if (ipv6_cmp(&range[mid].begin, addr) <= 0 &&
		    ipv6_cmp(addr, &range[mid].end) <= 0)
			return true;
		if (ipv6_cmp(&range[mid].begin, addr) > 0)
			hi = mid;
		else if (ipv6_cmp(&range[mid].end, addr) < 0)
			lo = mid + 1;
		else
			break;
	}

	WARN_ON(true);
	return false;
}

static bool
xt_geoip_mt6(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_geoip_match_info *info = par->matchinfo;
	const struct geoip_country_kernel *node;
	const struct ipv6hdr *iph = ipv6_hdr(skb);
	unsigned int i;
	struct in6_addr ip;

	memcpy(&ip, (info->flags & XT_GEOIP_SRC) ? &iph->saddr : &iph->daddr,
	       sizeof(ip));
	for (i = 0; i < 4; ++i)
		ip.s6_addr32[i] = ntohl(ip.s6_addr32[i]);

	rcu_read_lock();
	for (i = 0; i < info->count; i++) {
		if ((node = info->mem[i].kernel) == NULL) {
			printk(KERN_ERR "xt_geoip: what the hell ?? '%c%c' isn't loaded into memory... skip it!\n",
					COUNTRY(info->cc[i]));
			continue;
		}
		if (geoip_bsearch6(node->subnets, &ip, 0, node->count)) {
			rcu_read_unlock();
			return !(info->flags & XT_GEOIP_INV);
		}
	}

	rcu_read_unlock();
	return info->flags & XT_GEOIP_INV;
}

static bool geoip_bsearch4(const struct geoip_subnet4 *range,
    uint32_t addr, int lo, int hi)
{
	int mid;

	while (true) {
		if (hi <= lo)
			return false;
		mid = (lo + hi) / 2;
		if (range[mid].begin <= addr && addr <= range[mid].end)
			return true;
		if (range[mid].begin > addr)
			hi = mid;
		else if (range[mid].end < addr)
			lo = mid + 1;
		else
			break;
	}

	WARN_ON(true);
	return false;
}

static bool
xt_geoip_mt4(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_geoip_match_info *info = par->matchinfo;
	const struct geoip_country_kernel *node;
	const struct iphdr *iph = ip_hdr(skb);
	unsigned int i;
	uint32_t ip;

	ip = ntohl((info->flags & XT_GEOIP_SRC) ? iph->saddr : iph->daddr);
	rcu_read_lock();
	for (i = 0; i < info->count; i++) {
		if ((node = info->mem[i].kernel) == NULL) {
			printk(KERN_ERR "xt_geoip: what the hell ?? '%c%c' isn't loaded into memory... skip it!\n",
					COUNTRY(info->cc[i]));
			continue;
		}
		if (geoip_bsearch4(node->subnets, ip, 0, node->count)) {
			rcu_read_unlock();
			return !(info->flags & XT_GEOIP_INV);
		}
	}

	rcu_read_unlock();
	return info->flags & XT_GEOIP_INV;
}

static int xt_geoip_mt_checkentry(const struct xt_mtchk_param *par)
{
	struct xt_geoip_match_info *info = par->matchinfo;
	struct geoip_country_kernel *node;
	unsigned int i;

	for (i = 0; i < info->count; i++) {
		node = find_node(info->cc[i], nfp2geo[par->family]);
		if (node == NULL) {
			node = geoip_add_node((const void __user *)(unsigned long)info->mem[i].user,
			       nfp2geo[par->family]);
			if (IS_ERR(node)) {
				printk(KERN_ERR
						"xt_geoip: unable to load '%c%c' into memory: %ld\n",
						COUNTRY(info->cc[i]), PTR_ERR(node));
				return PTR_ERR(node);
			}
		}

		/* Overwrite the now-useless pointer info->mem[i] with
		 * a pointer to the node's kernelspace structure.
		 * This avoids searching for a node in the match() and
		 * destroy() functions.
		 */
		info->mem[i].kernel = node;
	}

	return 0;
}

static void xt_geoip_mt_destroy(const struct xt_mtdtor_param *par)
{
	struct xt_geoip_match_info *info = par->matchinfo;
	struct geoip_country_kernel *node;
	unsigned int i;

	/* This entry has been removed from the table so
	 * decrease the refcount of all countries it is
	 * using.
	 */

	for (i = 0; i < info->count; i++)
		if ((node = info->mem[i].kernel) != NULL) {
			/* Free up some memory if that node isn't used
			 * anymore. */
			geoip_try_remove_node(node);
		}
		else
			/* Something strange happened. There's no memory allocated for this
			 * country.  Please send this bug to the mailing list. */
			printk(KERN_ERR
					"xt_geoip: What happened peejix ? What happened acidfu ?\n"
					"xt_geoip: please report this bug to the maintainers\n");
}

static struct xt_match xt_geoip_match[] __read_mostly = {
	{
		.name       = "geoip",
		.revision   = 1,
		.family     = NFPROTO_IPV6,
		.match      = xt_geoip_mt6,
		.checkentry = xt_geoip_mt_checkentry,
		.destroy    = xt_geoip_mt_destroy,
		.matchsize  = sizeof(struct xt_geoip_match_info),
		.me         = THIS_MODULE,
	},
	{
		.name       = "geoip",
		.revision   = 1,
		.family     = NFPROTO_IPV4,
		.match      = xt_geoip_mt4,
		.checkentry = xt_geoip_mt_checkentry,
		.destroy    = xt_geoip_mt_destroy,
		.matchsize  = sizeof(struct xt_geoip_match_info),
		.me         = THIS_MODULE,
	},
};

static int __init xt_geoip_mt_init(void)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(geoip_head); ++i)
		INIT_LIST_HEAD(&geoip_head[i]);
	return xt_register_matches(xt_geoip_match, ARRAY_SIZE(xt_geoip_match));
}

static void __exit xt_geoip_mt_fini(void)
{
	xt_unregister_matches(xt_geoip_match, ARRAY_SIZE(xt_geoip_match));
}

module_init(xt_geoip_mt_init);
module_exit(xt_geoip_mt_fini);