1 /*
2 * Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>
3 */
4
5 #include <stdio.h>
6 #include <string.h>
7 #include <xtables.h>
8 #include <linux/netfilter_ipv6/ip6_tables.h>
9 #include <linux/netfilter_ipv6/ip6t_NPT.h>
10
11 enum {
12 O_SRC_PFX = 1 << 0,
13 O_DST_PFX = 1 << 1,
14 };
15
16 static const struct xt_option_entry DNPT_options[] = {
17 { .name = "src-pfx", .id = O_SRC_PFX, .type = XTTYPE_HOSTMASK,
18 .flags = XTOPT_MAND },
19 { .name = "dst-pfx", .id = O_DST_PFX, .type = XTTYPE_HOSTMASK,
20 .flags = XTOPT_MAND },
21 { }
22 };
23
DNPT_help(void)24 static void DNPT_help(void)
25 {
26 printf("DNPT target options:"
27 "\n"
28 " --src-pfx prefix/length\n"
29 " --dst-pfx prefix/length\n"
30 "\n");
31 }
32
DNPT_parse(struct xt_option_call * cb)33 static void DNPT_parse(struct xt_option_call *cb)
34 {
35 struct ip6t_npt_tginfo *npt = cb->data;
36
37 xtables_option_parse(cb);
38 switch (cb->entry->id) {
39 case O_SRC_PFX:
40 npt->src_pfx = cb->val.haddr;
41 npt->src_pfx_len = cb->val.hlen;
42 break;
43 case O_DST_PFX:
44 npt->dst_pfx = cb->val.haddr;
45 npt->dst_pfx_len = cb->val.hlen;
46 break;
47 }
48 }
49
DNPT_print(const void * ip,const struct xt_entry_target * target,int numeric)50 static void DNPT_print(const void *ip, const struct xt_entry_target *target,
51 int numeric)
52 {
53 const struct ip6t_npt_tginfo *npt = (const void *)target->data;
54
55 printf(" DNPT src-pfx %s/%u", xtables_ip6addr_to_numeric(&npt->src_pfx.in6),
56 npt->src_pfx_len);
57 printf(" dst-pfx %s/%u", xtables_ip6addr_to_numeric(&npt->dst_pfx.in6),
58 npt->dst_pfx_len);
59 }
60
DNPT_save(const void * ip,const struct xt_entry_target * target)61 static void DNPT_save(const void *ip, const struct xt_entry_target *target)
62 {
63 static const struct in6_addr zero_addr;
64 const struct ip6t_npt_tginfo *info = (const void *)target->data;
65
66 if (memcmp(&info->src_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
67 info->src_pfx_len != 0)
68 printf(" --src-pfx %s/%u",
69 xtables_ip6addr_to_numeric(&info->src_pfx.in6),
70 info->src_pfx_len);
71 if (memcmp(&info->dst_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
72 info->dst_pfx_len != 0)
73 printf(" --dst-pfx %s/%u",
74 xtables_ip6addr_to_numeric(&info->dst_pfx.in6),
75 info->dst_pfx_len);
76 }
77
78 static struct xtables_target snpt_tg_reg = {
79 .name = "DNPT",
80 .version = XTABLES_VERSION,
81 .family = NFPROTO_IPV6,
82 .size = XT_ALIGN(sizeof(struct ip6t_npt_tginfo)),
83 .userspacesize = offsetof(struct ip6t_npt_tginfo, adjustment),
84 .help = DNPT_help,
85 .x6_parse = DNPT_parse,
86 .print = DNPT_print,
87 .save = DNPT_save,
88 .x6_options = DNPT_options,
89 };
90
_init(void)91 void _init(void)
92 {
93 xtables_register_target(&snpt_tg_reg);
94 }
95