1 /* ebt_redirect
2 *
3 * Authors:
4 * Bart De Schuymer <bdschuym@pandora.be>
5 *
6 * April, 2002
7 */
8
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <getopt.h>
13 #include <xtables.h>
14 #include <linux/netfilter_bridge/ebt_redirect.h>
15 #include "iptables/nft.h"
16 #include "iptables/nft-bridge.h"
17
18 #define REDIRECT_TARGET '1'
19 static const struct option brredir_opts[] =
20 {
21 { "redirect-target", required_argument, 0, REDIRECT_TARGET },
22 { 0 }
23 };
24
brredir_print_help(void)25 static void brredir_print_help(void)
26 {
27 printf(
28 "redirect option:\n"
29 " --redirect-target target : ACCEPT, DROP, RETURN or CONTINUE\n");
30 }
31
brredir_init(struct xt_entry_target * target)32 static void brredir_init(struct xt_entry_target *target)
33 {
34 struct ebt_redirect_info *redirectinfo =
35 (struct ebt_redirect_info *)target->data;
36
37 redirectinfo->target = EBT_ACCEPT;
38 }
39
40 #define OPT_REDIRECT_TARGET 0x01
brredir_parse(int c,char ** argv,int invert,unsigned int * flags,const void * entry,struct xt_entry_target ** target)41 static int brredir_parse(int c, char **argv, int invert, unsigned int *flags,
42 const void *entry, struct xt_entry_target **target)
43 {
44 struct ebt_redirect_info *redirectinfo =
45 (struct ebt_redirect_info *)(*target)->data;
46
47 switch (c) {
48 case REDIRECT_TARGET:
49 EBT_CHECK_OPTION(flags, OPT_REDIRECT_TARGET);
50 if (ebt_fill_target(optarg, (unsigned int *)&redirectinfo->target))
51 xtables_error(PARAMETER_PROBLEM, "Illegal --redirect-target target");
52 break;
53 default:
54 return 0;
55 }
56 return 1;
57 }
58
brredir_print(const void * ip,const struct xt_entry_target * target,int numeric)59 static void brredir_print(const void *ip, const struct xt_entry_target *target, int numeric)
60 {
61 struct ebt_redirect_info *redirectinfo =
62 (struct ebt_redirect_info *)target->data;
63
64 if (redirectinfo->target == EBT_ACCEPT)
65 return;
66 printf("--redirect-target %s", ebt_target_name(redirectinfo->target));
67 }
68
brredir_verdict(int verdict)69 static const char* brredir_verdict(int verdict)
70 {
71 switch (verdict) {
72 case EBT_ACCEPT: return "accept";
73 case EBT_DROP: return "drop";
74 case EBT_CONTINUE: return "continue";
75 case EBT_RETURN: return "return";
76 }
77
78 return "";
79 }
80
brredir_xlate(struct xt_xlate * xl,const struct xt_xlate_tg_params * params)81 static int brredir_xlate(struct xt_xlate *xl,
82 const struct xt_xlate_tg_params *params)
83 {
84 const struct ebt_redirect_info *red = (const void*)params->target->data;
85
86 xt_xlate_add(xl, "meta set pkttype host");
87 if (red->target != EBT_ACCEPT)
88 xt_xlate_add(xl, " %s ", brredir_verdict(red->target));
89 return 0;
90 }
91
92 static struct xtables_target brredirect_target = {
93 .name = "redirect",
94 .version = XTABLES_VERSION,
95 .family = NFPROTO_BRIDGE,
96 .size = XT_ALIGN(sizeof(struct ebt_redirect_info)),
97 .userspacesize = XT_ALIGN(sizeof(struct ebt_redirect_info)),
98 .help = brredir_print_help,
99 .init = brredir_init,
100 .parse = brredir_parse,
101 .print = brredir_print,
102 .xlate = brredir_xlate,
103 .extra_opts = brredir_opts,
104 };
105
_init(void)106 void _init(void)
107 {
108 xtables_register_target(&brredirect_target);
109 }
110