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
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
|
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <xtables.h>
#include <linux/netfilter.h>
#include <linux/netfilter/xt_iprange.h>
struct ipt_iprange {
/* Inclusive: network order. */
__be32 min_ip, max_ip;
};
struct ipt_iprange_info {
struct ipt_iprange src;
struct ipt_iprange dst;
/* Flags from above */
uint8_t flags;
};
enum {
O_SRC_RANGE = 0,
O_DST_RANGE,
};
static void iprange_mt_help(void)
{
printf(
"iprange match options:\n"
"[!] --src-range ip[-ip] Match source IP in the specified range\n"
"[!] --dst-range ip[-ip] Match destination IP in the specified range\n");
}
static const struct xt_option_entry iprange_mt_opts[] = {
{.name = "src-range", .id = O_SRC_RANGE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "dst-range", .id = O_DST_RANGE, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
XTOPT_TABLEEND,
};
static void
iprange_parse_spec(const char *from, const char *to, union nf_inet_addr *range,
uint8_t family, const char *optname)
{
const char *spec[2] = {from, to};
struct in6_addr *ia6;
struct in_addr *ia4;
unsigned int i;
memset(range, 0, sizeof(union nf_inet_addr) * 2);
if (family == NFPROTO_IPV6) {
for (i = 0; i < ARRAY_SIZE(spec); ++i) {
ia6 = xtables_numeric_to_ip6addr(spec[i]);
if (ia6 == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange",
optname, spec[i]);
range[i].in6 = *ia6;
}
} else {
for (i = 0; i < ARRAY_SIZE(spec); ++i) {
ia4 = xtables_numeric_to_ipaddr(spec[i]);
if (ia4 == NULL)
xtables_param_act(XTF_BAD_VALUE, "iprange",
optname, spec[i]);
range[i].in = *ia4;
}
}
}
static void iprange_parse_range(const char *oarg, union nf_inet_addr *range,
uint8_t family, const char *optname)
{
char *arg = strdup(oarg);
char *dash;
if (arg == NULL)
xtables_error(RESOURCE_PROBLEM, "strdup");
dash = strchr(arg, '-');
if (dash == NULL) {
iprange_parse_spec(arg, arg, range, family, optname);
free(arg);
return;
}
*dash = '\0';
iprange_parse_spec(arg, dash + 1, range, family, optname);
if (memcmp(&range[0], &range[1], sizeof(*range)) > 0)
fprintf(stderr, "xt_iprange: range %s-%s is reversed and "
"will never match\n", arg, dash + 1);
free(arg);
}
static void iprange_parse(struct xt_option_call *cb)
{
struct ipt_iprange_info *info = cb->data;
union nf_inet_addr range[2];
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SRC_RANGE:
info->flags |= IPRANGE_SRC;
if (cb->invert)
info->flags |= IPRANGE_SRC_INV;
iprange_parse_range(cb->arg, range,
NFPROTO_IPV4, "--src-range");
info->src.min_ip = range[0].ip;
info->src.max_ip = range[1].ip;
break;
case O_DST_RANGE:
info->flags |= IPRANGE_DST;
if (cb->invert)
info->flags |= IPRANGE_DST_INV;
iprange_parse_range(cb->arg, range,
NFPROTO_IPV4, "--dst-range");
info->dst.min_ip = range[0].ip;
info->dst.max_ip = range[1].ip;
break;
}
}
static void iprange_mt_parse(struct xt_option_call *cb, uint8_t nfproto)
{
struct xt_iprange_mtinfo *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SRC_RANGE:
iprange_parse_range(cb->arg, &info->src_min, nfproto,
"--src-range");
info->flags |= IPRANGE_SRC;
if (cb->invert)
info->flags |= IPRANGE_SRC_INV;
break;
case O_DST_RANGE:
iprange_parse_range(cb->arg, &info->dst_min, nfproto,
"--dst-range");
info->flags |= IPRANGE_DST;
if (cb->invert)
info->flags |= IPRANGE_DST_INV;
break;
}
}
static void iprange_mt4_parse(struct xt_option_call *cb)
{
iprange_mt_parse(cb, NFPROTO_IPV4);
}
static void iprange_mt6_parse(struct xt_option_call *cb)
{
iprange_mt_parse(cb, NFPROTO_IPV6);
}
static void iprange_mt_check(struct xt_fcheck_call *cb)
{
if (cb->xflags == 0)
xtables_error(PARAMETER_PROBLEM,
"iprange match: You must specify `--src-range' or `--dst-range'");
}
static void
print_iprange(const struct ipt_iprange *range)
{
const unsigned char *byte_min, *byte_max;
byte_min = (const unsigned char *)&range->min_ip;
byte_max = (const unsigned char *)&range->max_ip;
printf(" %u.%u.%u.%u-%u.%u.%u.%u",
byte_min[0], byte_min[1], byte_min[2], byte_min[3],
byte_max[0], byte_max[1], byte_max[2], byte_max[3]);
}
static void iprange_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ipt_iprange_info *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
printf(" source IP range");
if (info->flags & IPRANGE_SRC_INV)
printf(" !");
print_iprange(&info->src);
}
if (info->flags & IPRANGE_DST) {
printf(" destination IP range");
if (info->flags & IPRANGE_DST_INV)
printf(" !");
print_iprange(&info->dst);
}
}
static void
iprange_mt4_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
printf(" source IP range");
if (info->flags & IPRANGE_SRC_INV)
printf(" !");
/*
* ipaddr_to_numeric() uses a static buffer, so cannot
* combine the printf() calls.
*/
printf(" %s", xtables_ipaddr_to_numeric(&info->src_min.in));
printf("-%s", xtables_ipaddr_to_numeric(&info->src_max.in));
}
if (info->flags & IPRANGE_DST) {
printf(" destination IP range");
if (info->flags & IPRANGE_DST_INV)
printf(" !");
printf(" %s", xtables_ipaddr_to_numeric(&info->dst_min.in));
printf("-%s", xtables_ipaddr_to_numeric(&info->dst_max.in));
}
}
static void
iprange_mt6_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
printf(" source IP range");
if (info->flags & IPRANGE_SRC_INV)
printf(" !");
/*
* ipaddr_to_numeric() uses a static buffer, so cannot
* combine the printf() calls.
*/
printf(" %s", xtables_ip6addr_to_numeric(&info->src_min.in6));
printf("-%s", xtables_ip6addr_to_numeric(&info->src_max.in6));
}
if (info->flags & IPRANGE_DST) {
printf(" destination IP range");
if (info->flags & IPRANGE_DST_INV)
printf(" !");
printf(" %s", xtables_ip6addr_to_numeric(&info->dst_min.in6));
printf("-%s", xtables_ip6addr_to_numeric(&info->dst_max.in6));
}
}
static void iprange_save(const void *ip, const struct xt_entry_match *match)
{
const struct ipt_iprange_info *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
if (info->flags & IPRANGE_SRC_INV)
printf(" !");
printf(" --src-range");
print_iprange(&info->src);
}
if (info->flags & IPRANGE_DST) {
if (info->flags & IPRANGE_DST_INV)
printf(" !");
printf(" --dst-range");
print_iprange(&info->dst);
}
}
static void iprange_mt4_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
if (info->flags & IPRANGE_SRC_INV)
printf(" !");
printf(" --src-range %s",
xtables_ipaddr_to_numeric(&info->src_min.in));
printf("-%s", xtables_ipaddr_to_numeric(&info->src_max.in));
}
if (info->flags & IPRANGE_DST) {
if (info->flags & IPRANGE_DST_INV)
printf(" !");
printf(" --dst-range %s",
xtables_ipaddr_to_numeric(&info->dst_min.in));
printf("-%s", xtables_ipaddr_to_numeric(&info->dst_max.in));
}
}
static void iprange_mt6_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_iprange_mtinfo *info = (const void *)match->data;
if (info->flags & IPRANGE_SRC) {
if (info->flags & IPRANGE_SRC_INV)
printf(" !");
printf(" --src-range %s",
xtables_ip6addr_to_numeric(&info->src_min.in6));
printf("-%s", xtables_ip6addr_to_numeric(&info->src_max.in6));
}
if (info->flags & IPRANGE_DST) {
if (info->flags & IPRANGE_DST_INV)
printf(" !");
printf(" --dst-range %s",
xtables_ip6addr_to_numeric(&info->dst_min.in6));
printf("-%s", xtables_ip6addr_to_numeric(&info->dst_max.in6));
}
}
static void
print_iprange_xlate(const struct ipt_iprange *range,
struct xt_xlate *xl)
{
const unsigned char *byte_min, *byte_max;
byte_min = (const unsigned char *)&range->min_ip;
byte_max = (const unsigned char *)&range->max_ip;
xt_xlate_add(xl, " %u.%u.%u.%u-%u.%u.%u.%u ",
byte_min[0], byte_min[1], byte_min[2], byte_min[3],
byte_max[0], byte_max[1], byte_max[2], byte_max[3]);
}
static int iprange_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct ipt_iprange_info *info = (const void *)params->match->data;
char *space = "";
if (info->flags & IPRANGE_SRC) {
xt_xlate_add(xl, "ip saddr%s",
info->flags & IPRANGE_SRC_INV ? " !=" : "");
print_iprange_xlate(&info->src, xl);
space = " ";
}
if (info->flags & IPRANGE_DST) {
xt_xlate_add(xl, "%sip daddr%s", space,
info->flags & IPRANGE_DST_INV ? " !=" : "");
print_iprange_xlate(&info->dst, xl);
}
return 1;
}
static int iprange_mt4_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_iprange_mtinfo *info =
(const void *)params->match->data;
char *space = "";
if (info->flags & IPRANGE_SRC) {
xt_xlate_add(xl, "ip saddr%s %s",
info->flags & IPRANGE_SRC_INV ? " !=" : "",
xtables_ipaddr_to_numeric(&info->src_min.in));
xt_xlate_add(xl, "-%s",
xtables_ipaddr_to_numeric(&info->src_max.in));
space = " ";
}
if (info->flags & IPRANGE_DST) {
xt_xlate_add(xl, "%sip daddr%s %s", space,
info->flags & IPRANGE_DST_INV ? " !=" : "",
xtables_ipaddr_to_numeric(&info->dst_min.in));
xt_xlate_add(xl, "-%s",
xtables_ipaddr_to_numeric(&info->dst_max.in));
}
return 1;
}
static int iprange_mt6_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_iprange_mtinfo *info =
(const void *)params->match->data;
char *space = "";
if (info->flags & IPRANGE_SRC) {
xt_xlate_add(xl, "ip6 saddr%s %s",
info->flags & IPRANGE_SRC_INV ? " !=" : "",
xtables_ip6addr_to_numeric(&info->src_min.in6));
xt_xlate_add(xl, "-%s",
xtables_ip6addr_to_numeric(&info->src_max.in6));
space = " ";
}
if (info->flags & IPRANGE_DST) {
xt_xlate_add(xl, "%sip6 daddr%s %s", space,
info->flags & IPRANGE_DST_INV ? " !=" : "",
xtables_ip6addr_to_numeric(&info->dst_min.in6));
xt_xlate_add(xl, "-%s",
xtables_ip6addr_to_numeric(&info->dst_max.in6));
}
return 1;
}
static struct xtables_match iprange_mt_reg[] = {
{
.version = XTABLES_VERSION,
.name = "iprange",
.revision = 0,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct ipt_iprange_info)),
.userspacesize = XT_ALIGN(sizeof(struct ipt_iprange_info)),
.help = iprange_mt_help,
.x6_parse = iprange_parse,
.x6_fcheck = iprange_mt_check,
.print = iprange_print,
.save = iprange_save,
.x6_options = iprange_mt_opts,
.xlate = iprange_xlate,
},
{
.version = XTABLES_VERSION,
.name = "iprange",
.revision = 1,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.help = iprange_mt_help,
.x6_parse = iprange_mt4_parse,
.x6_fcheck = iprange_mt_check,
.print = iprange_mt4_print,
.save = iprange_mt4_save,
.x6_options = iprange_mt_opts,
.xlate = iprange_mt4_xlate,
},
{
.version = XTABLES_VERSION,
.name = "iprange",
.revision = 1,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_iprange_mtinfo)),
.help = iprange_mt_help,
.x6_parse = iprange_mt6_parse,
.x6_fcheck = iprange_mt_check,
.print = iprange_mt6_print,
.save = iprange_mt6_save,
.x6_options = iprange_mt_opts,
.xlate = iprange_mt6_xlate,
},
};
void _init(void)
{
xtables_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
}
|
