[5494bc]: extensions / libxt_IPMARK.c  Maximize  Restore  History

Download this file

172 lines (151 with data), 5.2 kB

  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
/*
* "IPMARK" target extension for iptables
* Copyright Š Grzegorz Janoszka <Grzegorz.Janoszka@pro.onet.pl>, 2003
* Jan Engelhardt, 2008
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xtables.h>
#include "xt_IPMARK.h"
#include "compat_user.h"
enum {
FL_ADDR_USED = 1 << 0,
FL_AND_MASK_USED = 1 << 1,
FL_OR_MASK_USED = 1 << 2,
FL_SHIFT = 1 << 3,
};
/* Function which prints out usage message. */
static void ipmark_tg_help(void)
{
printf(
"IPMARK target options:\n"
" --addr {src|dst} use source or destination ip address\n"
" --and-mask value logical AND ip address with this value becomes MARK\n"
" --or-mask value logical OR ip address with this value becomes MARK\n"
" --shift value shift address right by value before copying to mark\n"
"\n");
}
static const struct option ipmark_tg_opts[] = {
{.name = "addr", .has_arg = true, .val = '1'},
{.name = "and-mask", .has_arg = true, .val = '2'},
{.name = "or-mask", .has_arg = true, .val = '3'},
{.name = "shift", .has_arg = true, .val = '4'},
{NULL},
};
/* Initialize the target. */
static void ipmark_tg_init(struct xt_entry_target *t)
{
struct xt_ipmark_tginfo *info = (void *)t->data;
info->andmask = ~0U;
}
static int ipmark_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_ipmark_tginfo *info = (void *)(*target)->data;
unsigned int n;
switch (c) {
case '1':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "addr", *flags & FL_ADDR_USED);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "addr", invert);
if (strcmp(optarg, "src") == 0)
info->selector = XT_IPMARK_SRC;
else if (strcmp(optarg, "dst") == 0)
info->selector = XT_IPMARK_DST;
else
xtables_error(PARAMETER_PROBLEM, "Bad addr value `%s' - should be `src' or `dst'", optarg);
*flags |= FL_ADDR_USED;
return true;
case '2':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "and-mask", *flags & FL_AND_MASK_USED);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "and-mask", invert);
if (!xtables_strtoui(optarg, NULL, &n, 0, ~0U))
xtables_param_act(XTF_BAD_VALUE, "IPMARK", "and-mask", optarg);
info->andmask = n;
*flags |= FL_AND_MASK_USED;
return true;
case '3':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "or-mask", *flags & FL_OR_MASK_USED);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "or-mask", invert);
if (!xtables_strtoui(optarg, NULL, &n, 0, ~0U))
xtables_param_act(XTF_BAD_VALUE, "IPMARK", "or-mask", optarg);
info->ormask = n;
*flags |= FL_OR_MASK_USED;
return true;
case '4':
xtables_param_act(XTF_ONLY_ONCE, "IPMARK", "--shift", *flags & FL_SHIFT);
xtables_param_act(XTF_NO_INVERT, "IPMARK", "--shift", invert);
/*
* Anything >31 does not make sense for IPv4, but it still
* does the right thing.
*/
if (!xtables_strtoui(optarg, NULL, &n, 0, 128))
xtables_param_act(XTF_BAD_VALUE, "IPMARK", "--shift", optarg);
info->shift = n;
*flags |= FL_SHIFT;
return true;
}
return false;
}
static void ipmark_tg_check(unsigned int flags)
{
if (!(flags & FL_ADDR_USED))
xtables_error(PARAMETER_PROBLEM,
"IPMARK target: Parameter --addr is required");
}
static void
ipmark_tg_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
const struct xt_ipmark_tginfo *info = (const void *)target->data;
if (info->selector == XT_IPMARK_SRC)
printf(" IPMARK src ip ");
else
printf(" IPMARK dst ip ");
if (info->shift != 0)
printf(" shift %u ", (unsigned int)info->shift);
if (info->andmask != ~0U)
printf(" and 0x%x ", (unsigned int)info->andmask);
if (info->ormask != 0)
printf(" or 0x%x ", (unsigned int)info->ormask);
}
static void
ipmark_tg_save(const void *entry, const struct xt_entry_target *target)
{
const struct xt_ipmark_tginfo *info = (const void *)target->data;
if (info->selector == XT_IPMARK_SRC)
printf(" --addr src ");
else
printf(" --addr dst ");
if (info->shift != 0)
printf(" --shift %u ", (unsigned int)info->shift);
if (info->andmask != ~0U)
printf(" --and-mask 0x%x ", (unsigned int)info->andmask);
if (info->ormask != 0)
printf(" --or-mask 0x%x ", (unsigned int)info->ormask);
}
static struct xtables_target ipmark_tg_reg = {
.version = XTABLES_VERSION,
.name = "IPMARK",
.family = NFPROTO_UNSPEC,
.revision = 1,
.size = XT_ALIGN(sizeof(struct xt_ipmark_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_ipmark_tginfo)),
.help = ipmark_tg_help,
.init = ipmark_tg_init,
.parse = ipmark_tg_parse,
.final_check = ipmark_tg_check,
.print = ipmark_tg_print,
.save = ipmark_tg_save,
.extra_opts = ipmark_tg_opts,
};
static __attribute__((constructor)) void ipmark_tg_ldr(void)
{
xtables_register_target(&ipmark_tg_reg);
}

Get latest updates about Open Source Projects, Conferences and News.

Sign up for the SourceForge newsletter:





No, thanks