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135 lines
3.1 KiB
135 lines
3.1 KiB
#include <stdio.h>
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#include <xtables.h>
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#include <linux/netfilter/xt_ipcomp.h>
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enum {
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O_compSPI = 0,
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O_compRES,
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};
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static void comp_help(void)
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{
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printf(
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"comp match options:\n"
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"[!] --ipcompspi 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 comp_opts[] = {
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{.name = "ipcompspi", .id = O_compSPI, .type = XTTYPE_UINT32RC,
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.flags = XTOPT_INVERT | XTOPT_PUT,
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XTOPT_POINTER(struct xt_ipcomp, spis)},
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{.name = "compres", .id = O_compRES, .type = XTTYPE_NONE},
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XTOPT_TABLEEND,
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};
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#undef s
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static void comp_parse(struct xt_option_call *cb)
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{
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struct xt_ipcomp *compinfo = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_compSPI:
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if (cb->nvals == 1)
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compinfo->spis[1] = compinfo->spis[0];
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if (cb->invert)
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compinfo->invflags |= XT_IPCOMP_INV_SPI;
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break;
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case O_compRES:
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compinfo->hdrres = 1;
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break;
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}
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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 comp_print(const void *ip, const struct xt_entry_match *match,
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int numeric)
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{
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const struct xt_ipcomp *comp = (struct xt_ipcomp *)match->data;
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printf(" comp ");
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print_spis("spi", comp->spis[0], comp->spis[1],
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comp->invflags & XT_IPCOMP_INV_SPI);
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if (comp->hdrres)
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printf(" reserved");
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if (comp->invflags & ~XT_IPCOMP_INV_MASK)
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printf(" Unknown invflags: 0x%X",
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comp->invflags & ~XT_IPCOMP_INV_MASK);
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}
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static void comp_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_ipcomp *compinfo = (struct xt_ipcomp *)match->data;
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if (!(compinfo->spis[0] == 0
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&& compinfo->spis[1] == 0xFFFFFFFF)) {
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printf("%s --ipcompspi ",
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(compinfo->invflags & XT_IPCOMP_INV_SPI) ? " !" : "");
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if (compinfo->spis[0]
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!= compinfo->spis[1])
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printf("%u:%u",
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compinfo->spis[0],
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compinfo->spis[1]);
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else
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printf("%u",
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compinfo->spis[0]);
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}
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if (compinfo->hdrres != 0 )
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printf(" --compres");
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}
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static int comp_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_ipcomp *compinfo =
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(struct xt_ipcomp *)params->match->data;
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xt_xlate_add(xl, "comp cpi %s",
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compinfo->invflags & XT_IPCOMP_INV_SPI ? "!= " : "");
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if (compinfo->spis[0] != compinfo->spis[1])
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xt_xlate_add(xl, "%u-%u", compinfo->spis[0],
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compinfo->spis[1]);
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else
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xt_xlate_add(xl, "%u", compinfo->spis[0]);
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return 1;
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}
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static struct xtables_match comp_mt_reg = {
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.name = "ipcomp",
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.version = XTABLES_VERSION,
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.family = NFPROTO_UNSPEC,
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.size = XT_ALIGN(sizeof(struct xt_ipcomp)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_ipcomp)),
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.help = comp_help,
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.print = comp_print,
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.save = comp_save,
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.x6_parse = comp_parse,
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.x6_options = comp_opts,
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.xlate = comp_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(&comp_mt_reg);
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};
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