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134 lines
3.1 KiB
134 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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