1*a71a9546SAutomerger Merge Worker #include <stdio.h>
2*a71a9546SAutomerger Merge Worker #include <xtables.h>
3*a71a9546SAutomerger Merge Worker #include <linux/netfilter/xt_helper.h>
4*a71a9546SAutomerger Merge Worker
5*a71a9546SAutomerger Merge Worker enum {
6*a71a9546SAutomerger Merge Worker O_HELPER = 0,
7*a71a9546SAutomerger Merge Worker };
8*a71a9546SAutomerger Merge Worker
helper_help(void)9*a71a9546SAutomerger Merge Worker static void helper_help(void)
10*a71a9546SAutomerger Merge Worker {
11*a71a9546SAutomerger Merge Worker printf(
12*a71a9546SAutomerger Merge Worker "helper match options:\n"
13*a71a9546SAutomerger Merge Worker "[!] --helper string Match helper identified by string\n");
14*a71a9546SAutomerger Merge Worker }
15*a71a9546SAutomerger Merge Worker
16*a71a9546SAutomerger Merge Worker static const struct xt_option_entry helper_opts[] = {
17*a71a9546SAutomerger Merge Worker {.name = "helper", .id = O_HELPER, .type = XTTYPE_STRING,
18*a71a9546SAutomerger Merge Worker .flags = XTOPT_MAND | XTOPT_INVERT | XTOPT_PUT,
19*a71a9546SAutomerger Merge Worker XTOPT_POINTER(struct xt_helper_info, name)},
20*a71a9546SAutomerger Merge Worker XTOPT_TABLEEND,
21*a71a9546SAutomerger Merge Worker };
22*a71a9546SAutomerger Merge Worker
helper_parse(struct xt_option_call * cb)23*a71a9546SAutomerger Merge Worker static void helper_parse(struct xt_option_call *cb)
24*a71a9546SAutomerger Merge Worker {
25*a71a9546SAutomerger Merge Worker struct xt_helper_info *info = cb->data;
26*a71a9546SAutomerger Merge Worker
27*a71a9546SAutomerger Merge Worker xtables_option_parse(cb);
28*a71a9546SAutomerger Merge Worker if (cb->invert)
29*a71a9546SAutomerger Merge Worker info->invert = 1;
30*a71a9546SAutomerger Merge Worker }
31*a71a9546SAutomerger Merge Worker
32*a71a9546SAutomerger Merge Worker static void
helper_print(const void * ip,const struct xt_entry_match * match,int numeric)33*a71a9546SAutomerger Merge Worker helper_print(const void *ip, const struct xt_entry_match *match, int numeric)
34*a71a9546SAutomerger Merge Worker {
35*a71a9546SAutomerger Merge Worker const struct xt_helper_info *info = (const void *)match->data;
36*a71a9546SAutomerger Merge Worker
37*a71a9546SAutomerger Merge Worker printf(" helper match %s\"%s\"", info->invert ? "! " : "", info->name);
38*a71a9546SAutomerger Merge Worker }
39*a71a9546SAutomerger Merge Worker
helper_save(const void * ip,const struct xt_entry_match * match)40*a71a9546SAutomerger Merge Worker static void helper_save(const void *ip, const struct xt_entry_match *match)
41*a71a9546SAutomerger Merge Worker {
42*a71a9546SAutomerger Merge Worker const struct xt_helper_info *info = (const void *)match->data;
43*a71a9546SAutomerger Merge Worker
44*a71a9546SAutomerger Merge Worker printf("%s --helper", info->invert ? " !" : "");
45*a71a9546SAutomerger Merge Worker xtables_save_string(info->name);
46*a71a9546SAutomerger Merge Worker }
47*a71a9546SAutomerger Merge Worker
helper_xlate(struct xt_xlate * xl,const struct xt_xlate_mt_params * params)48*a71a9546SAutomerger Merge Worker static int helper_xlate(struct xt_xlate *xl,
49*a71a9546SAutomerger Merge Worker const struct xt_xlate_mt_params *params)
50*a71a9546SAutomerger Merge Worker {
51*a71a9546SAutomerger Merge Worker const struct xt_helper_info *info = (const void *)params->match->data;
52*a71a9546SAutomerger Merge Worker
53*a71a9546SAutomerger Merge Worker xt_xlate_add(xl, "ct helper%s \"%s\"",
54*a71a9546SAutomerger Merge Worker info->invert ? " !=" : "", info->name);
55*a71a9546SAutomerger Merge Worker
56*a71a9546SAutomerger Merge Worker return 1;
57*a71a9546SAutomerger Merge Worker }
58*a71a9546SAutomerger Merge Worker
59*a71a9546SAutomerger Merge Worker static struct xtables_match helper_match = {
60*a71a9546SAutomerger Merge Worker .family = NFPROTO_UNSPEC,
61*a71a9546SAutomerger Merge Worker .name = "helper",
62*a71a9546SAutomerger Merge Worker .version = XTABLES_VERSION,
63*a71a9546SAutomerger Merge Worker .size = XT_ALIGN(sizeof(struct xt_helper_info)),
64*a71a9546SAutomerger Merge Worker .help = helper_help,
65*a71a9546SAutomerger Merge Worker .print = helper_print,
66*a71a9546SAutomerger Merge Worker .save = helper_save,
67*a71a9546SAutomerger Merge Worker .x6_parse = helper_parse,
68*a71a9546SAutomerger Merge Worker .x6_options = helper_opts,
69*a71a9546SAutomerger Merge Worker .xlate = helper_xlate,
70*a71a9546SAutomerger Merge Worker };
71*a71a9546SAutomerger Merge Worker
_init(void)72*a71a9546SAutomerger Merge Worker void _init(void)
73*a71a9546SAutomerger Merge Worker {
74*a71a9546SAutomerger Merge Worker xtables_register_match(&helper_match);
75*a71a9546SAutomerger Merge Worker }
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