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_init(struct xt_entry_match * m)24 static void esp_init(struct xt_entry_match *m)
25 {
26 struct xt_esp *espinfo = (void *)m->data;
27
28 espinfo->spis[1] = ~0U;
29 }
30
esp_parse(struct xt_option_call * cb)31 static void esp_parse(struct xt_option_call *cb)
32 {
33 struct xt_esp *espinfo = cb->data;
34
35 xtables_option_parse(cb);
36 if (cb->nvals == 1)
37 espinfo->spis[1] = espinfo->spis[0];
38 if (cb->invert)
39 espinfo->invflags |= XT_ESP_INV_SPI;
40 }
41
42 static void
print_spis(const char * name,uint32_t min,uint32_t max,int invert)43 print_spis(const char *name, uint32_t min, uint32_t max,
44 int invert)
45 {
46 const char *inv = invert ? "!" : "";
47
48 if (min != 0 || max != 0xFFFFFFFF || invert) {
49 if (min == max)
50 printf(" %s:%s%u", name, inv, min);
51 else
52 printf(" %ss:%s%u:%u", name, inv, min, max);
53 }
54 }
55
56 static void
esp_print(const void * ip,const struct xt_entry_match * match,int numeric)57 esp_print(const void *ip, const struct xt_entry_match *match, int numeric)
58 {
59 const struct xt_esp *esp = (struct xt_esp *)match->data;
60
61 printf(" esp");
62 print_spis("spi", esp->spis[0], esp->spis[1],
63 esp->invflags & XT_ESP_INV_SPI);
64 if (esp->invflags & ~XT_ESP_INV_MASK)
65 printf(" Unknown invflags: 0x%X",
66 esp->invflags & ~XT_ESP_INV_MASK);
67 }
68
esp_save(const void * ip,const struct xt_entry_match * match)69 static void esp_save(const void *ip, const struct xt_entry_match *match)
70 {
71 const struct xt_esp *espinfo = (struct xt_esp *)match->data;
72
73 if (!(espinfo->spis[0] == 0
74 && espinfo->spis[1] == 0xFFFFFFFF)) {
75 printf("%s --espspi ",
76 (espinfo->invflags & XT_ESP_INV_SPI) ? " !" : "");
77 if (espinfo->spis[0]
78 != espinfo->spis[1])
79 printf("%u:%u",
80 espinfo->spis[0],
81 espinfo->spis[1]);
82 else
83 printf("%u",
84 espinfo->spis[0]);
85 }
86
87 }
88
esp_xlate(struct xt_xlate * xl,const struct xt_xlate_mt_params * params)89 static int esp_xlate(struct xt_xlate *xl,
90 const struct xt_xlate_mt_params *params)
91 {
92 const struct xt_esp *espinfo = (struct xt_esp *)params->match->data;
93
94 if (!(espinfo->spis[0] == 0 && espinfo->spis[1] == 0xFFFFFFFF)) {
95 xt_xlate_add(xl, "esp spi%s",
96 (espinfo->invflags & XT_ESP_INV_SPI) ? " !=" : "");
97 if (espinfo->spis[0] != espinfo->spis[1])
98 xt_xlate_add(xl, " %u-%u", espinfo->spis[0],
99 espinfo->spis[1]);
100 else
101 xt_xlate_add(xl, " %u", espinfo->spis[0]);
102 }
103
104 return 1;
105 }
106
107 static struct xtables_match esp_match = {
108 .family = NFPROTO_UNSPEC,
109 .name = "esp",
110 .version = XTABLES_VERSION,
111 .size = XT_ALIGN(sizeof(struct xt_esp)),
112 .userspacesize = XT_ALIGN(sizeof(struct xt_esp)),
113 .help = esp_help,
114 .init = esp_init,
115 .print = esp_print,
116 .save = esp_save,
117 .x6_parse = esp_parse,
118 .x6_options = esp_opts,
119 .xlate = esp_xlate,
120 };
121
122 void
_init(void)123 _init(void)
124 {
125 xtables_register_match(&esp_match);
126 }
127