#include <stdio.h>
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#include <xtables.h>
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#include <linux/netfilter/xt_esp.h>
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enum {
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O_ESPSPI = 0,
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};
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static void esp_help(void)
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{
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printf(
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"esp match options:\n"
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"[!] --espspi spi[:spi]\n"
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" match spi (range)\n");
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}
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static const struct xt_option_entry esp_opts[] = {
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{.name = "espspi", .id = O_ESPSPI, .type = XTTYPE_UINT32RC,
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.flags = XTOPT_INVERT | XTOPT_PUT,
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XTOPT_POINTER(struct xt_esp, spis)},
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XTOPT_TABLEEND,
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};
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static void esp_init(struct xt_entry_match *m)
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{
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struct xt_esp *espinfo = (void *)m->data;
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espinfo->spis[1] = ~0U;
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}
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static void esp_parse(struct xt_option_call *cb)
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{
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struct xt_esp *espinfo = cb->data;
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xtables_option_parse(cb);
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if (cb->nvals == 1)
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espinfo->spis[1] = espinfo->spis[0];
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if (cb->invert)
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espinfo->invflags |= XT_ESP_INV_SPI;
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}
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static void
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print_spis(const char *name, uint32_t min, uint32_t max,
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int invert)
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{
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const char *inv = invert ? "!" : "";
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if (min != 0 || max != 0xFFFFFFFF || invert) {
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if (min == max)
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printf(" %s:%s%u", name, inv, min);
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else
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printf(" %ss:%s%u:%u", name, inv, min, max);
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}
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}
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static void
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esp_print(const void *ip, const struct xt_entry_match *match, int numeric)
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{
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const struct xt_esp *esp = (struct xt_esp *)match->data;
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printf(" esp");
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print_spis("spi", esp->spis[0], esp->spis[1],
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esp->invflags & XT_ESP_INV_SPI);
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if (esp->invflags & ~XT_ESP_INV_MASK)
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printf(" Unknown invflags: 0x%X",
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esp->invflags & ~XT_ESP_INV_MASK);
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}
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static void esp_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_esp *espinfo = (struct xt_esp *)match->data;
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if (!(espinfo->spis[0] == 0
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&& espinfo->spis[1] == 0xFFFFFFFF)) {
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printf("%s --espspi ",
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(espinfo->invflags & XT_ESP_INV_SPI) ? " !" : "");
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if (espinfo->spis[0]
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!= espinfo->spis[1])
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printf("%u:%u",
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espinfo->spis[0],
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espinfo->spis[1]);
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else
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printf("%u",
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espinfo->spis[0]);
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}
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}
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static int esp_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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const struct xt_esp *espinfo = (struct xt_esp *)params->match->data;
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if (!(espinfo->spis[0] == 0 && espinfo->spis[1] == 0xFFFFFFFF)) {
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xt_xlate_add(xl, "esp spi%s",
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(espinfo->invflags & XT_ESP_INV_SPI) ? " !=" : "");
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if (espinfo->spis[0] != espinfo->spis[1])
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xt_xlate_add(xl, " %u-%u", espinfo->spis[0],
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espinfo->spis[1]);
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else
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xt_xlate_add(xl, " %u", espinfo->spis[0]);
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}
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return 1;
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}
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static struct xtables_match esp_match = {
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.family = NFPROTO_UNSPEC,
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.name = "esp",
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.version = XTABLES_VERSION,
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.size = XT_ALIGN(sizeof(struct xt_esp)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_esp)),
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.help = esp_help,
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.init = esp_init,
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.print = esp_print,
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.save = esp_save,
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.x6_parse = esp_parse,
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.x6_options = esp_opts,
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.xlate = esp_xlate,
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};
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void
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_init(void)
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{
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xtables_register_match(&esp_match);
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}
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