1 #include <stdio.h>
2 #include <xtables.h>
3 #include <linux/netfilter/xt_esp.h>
4
5 enum {
6 O_ESPSPI = 0,
7 };
8
esp_help(void)9 static void esp_help(void)
10 {
11 printf(
12 "esp match options:\n"
13 "[!] --espspi spi[:spi]\n"
14 " match spi (range)\n");
15 }
16
17 static const struct xt_option_entry esp_opts[] = {
18 {.name = "espspi", .id = O_ESPSPI, .type = XTTYPE_UINT32RC,
19 .flags = XTOPT_INVERT | XTOPT_PUT,
20 XTOPT_POINTER(struct xt_esp, spis)},
21 XTOPT_TABLEEND,
22 };
23
esp_parse(struct xt_option_call * cb)24 static void esp_parse(struct xt_option_call *cb)
25 {
26 struct xt_esp *espinfo = cb->data;
27
28 xtables_option_parse(cb);
29 if (cb->nvals == 1)
30 espinfo->spis[1] = espinfo->spis[0];
31 if (cb->invert)
32 espinfo->invflags |= XT_ESP_INV_SPI;
33 }
34
35 static void
print_spis(const char * name,uint32_t min,uint32_t max,int invert)36 print_spis(const char *name, uint32_t min, uint32_t max,
37 int invert)
38 {
39 const char *inv = invert ? "!" : "";
40
41 if (min != 0 || max != 0xFFFFFFFF || invert) {
42 if (min == max)
43 printf(" %s:%s%u", name, inv, min);
44 else
45 printf(" %ss:%s%u:%u", name, inv, min, max);
46 }
47 }
48
49 static void
esp_print(const void * ip,const struct xt_entry_match * match,int numeric)50 esp_print(const void *ip, const struct xt_entry_match *match, int numeric)
51 {
52 const struct xt_esp *esp = (struct xt_esp *)match->data;
53
54 printf(" esp");
55 print_spis("spi", esp->spis[0], esp->spis[1],
56 esp->invflags & XT_ESP_INV_SPI);
57 if (esp->invflags & ~XT_ESP_INV_MASK)
58 printf(" Unknown invflags: 0x%X",
59 esp->invflags & ~XT_ESP_INV_MASK);
60 }
61
esp_save(const void * ip,const struct xt_entry_match * match)62 static void esp_save(const void *ip, const struct xt_entry_match *match)
63 {
64 const struct xt_esp *espinfo = (struct xt_esp *)match->data;
65
66 if (!(espinfo->spis[0] == 0
67 && espinfo->spis[1] == 0xFFFFFFFF)) {
68 printf("%s --espspi ",
69 (espinfo->invflags & XT_ESP_INV_SPI) ? " !" : "");
70 if (espinfo->spis[0]
71 != espinfo->spis[1])
72 printf("%u:%u",
73 espinfo->spis[0],
74 espinfo->spis[1]);
75 else
76 printf("%u",
77 espinfo->spis[0]);
78 }
79
80 }
81
82 static struct xtables_match esp_match = {
83 .family = NFPROTO_UNSPEC,
84 .name = "esp",
85 .version = XTABLES_VERSION,
86 .size = XT_ALIGN(sizeof(struct xt_esp)),
87 .userspacesize = XT_ALIGN(sizeof(struct xt_esp)),
88 .help = esp_help,
89 .print = esp_print,
90 .save = esp_save,
91 .x6_parse = esp_parse,
92 .x6_options = esp_opts,
93 };
94
95 void
_init(void)96 _init(void)
97 {
98 xtables_register_match(&esp_match);
99 }
100