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#include <stdio.h>
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#include <xtables.h>
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#include <linux/netfilter_ipv6/ip6t_ah.h>
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enum {
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O_AHSPI = 0,
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O_AHLEN,
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O_AHRES,
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};
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static void ah_help(void)
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{
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printf(
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"ah match options:\n"
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"[!] --ahspi spi[:spi] match spi (range)\n"
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"[!] --ahlen length total length of this header\n"
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" --ahres check the reserved field too\n");
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}
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#define s struct ip6t_ah
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static const struct xt_option_entry ah_opts[] = {
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{.name = "ahspi", .id = O_AHSPI, .type = XTTYPE_UINT32RC,
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.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, spis)},
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{.name = "ahlen", .id = O_AHLEN, .type = XTTYPE_UINT32,
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.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdrlen)},
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{.name = "ahres", .id = O_AHRES, .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 ah_init(struct xt_entry_match *m)
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{
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struct ip6t_ah *ahinfo = (void *)m->data;
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/* Defaults for when no --ahspi is used at all */
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ahinfo->spis[1] = ~0U;
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}
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static void ah_parse(struct xt_option_call *cb)
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{
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struct ip6t_ah *ahinfo = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_AHSPI:
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if (cb->nvals == 1)
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ahinfo->spis[1] = ahinfo->spis[0];
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if (cb->invert)
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ahinfo->invflags |= IP6T_AH_INV_SPI;
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break;
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case O_AHLEN:
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if (cb->invert)
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ahinfo->invflags |= IP6T_AH_INV_LEN;
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break;
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case O_AHRES:
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ahinfo->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
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print_len(const char *name, uint32_t len, int invert)
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{
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const char *inv = invert ? "!" : "";
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if (len != 0 || invert)
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printf("%s:%s%u", name, inv, len);
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}
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static void ah_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 ip6t_ah *ah = (struct ip6t_ah *)match->data;
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printf(" ah ");
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print_spis("spi", ah->spis[0], ah->spis[1],
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ah->invflags & IP6T_AH_INV_SPI);
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print_len("length", ah->hdrlen,
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ah->invflags & IP6T_AH_INV_LEN);
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if (ah->hdrres)
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printf(" reserved");
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if (ah->invflags & ~IP6T_AH_INV_MASK)
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printf(" Unknown invflags: 0x%X",
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ah->invflags & ~IP6T_AH_INV_MASK);
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}
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static void ah_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct ip6t_ah *ahinfo = (struct ip6t_ah *)match->data;
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if (!(ahinfo->spis[0] == 0
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&& ahinfo->spis[1] == 0xFFFFFFFF)) {
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printf("%s --ahspi ",
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(ahinfo->invflags & IP6T_AH_INV_SPI) ? " !" : "");
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if (ahinfo->spis[0]
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!= ahinfo->spis[1])
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printf("%u:%u",
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ahinfo->spis[0],
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ahinfo->spis[1]);
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else
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printf("%u",
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ahinfo->spis[0]);
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}
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if (ahinfo->hdrlen != 0 || (ahinfo->invflags & IP6T_AH_INV_LEN) ) {
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printf("%s --ahlen %u",
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(ahinfo->invflags & IP6T_AH_INV_LEN) ? " !" : "",
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ahinfo->hdrlen);
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}
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if (ahinfo->hdrres != 0 )
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printf(" --ahres");
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}
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static int ah_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 ip6t_ah *ahinfo = (struct ip6t_ah *)params->match->data;
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char *space = "";
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if (!(ahinfo->spis[0] == 0 && ahinfo->spis[1] == 0xFFFFFFFF)) {
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xt_xlate_add(xl, "ah spi%s ",
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(ahinfo->invflags & IP6T_AH_INV_SPI) ? " !=" : "");
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if (ahinfo->spis[0] != ahinfo->spis[1])
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xt_xlate_add(xl, "%u-%u", ahinfo->spis[0],
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ahinfo->spis[1]);
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else
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xt_xlate_add(xl, "%u", ahinfo->spis[0]);
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space = " ";
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}
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if (ahinfo->hdrlen != 0 || (ahinfo->invflags & IP6T_AH_INV_LEN)) {
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xt_xlate_add(xl, "%sah hdrlength%s %u", space,
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(ahinfo->invflags & IP6T_AH_INV_LEN) ? " !=" : "",
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ahinfo->hdrlen);
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space = " ";
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}
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if (ahinfo->hdrres != 0) {
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xt_xlate_add(xl, "%sah reserved %u", space, ahinfo->hdrres);
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space = " ";
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}
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if (!space[0]) /* plain '-m ah' */
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xt_xlate_add(xl, "meta l4proto ah");
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return 1;
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}
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static struct xtables_match ah_mt6_reg = {
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.name = "ah",
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.version = XTABLES_VERSION,
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.family = NFPROTO_IPV6,
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.size = XT_ALIGN(sizeof(struct ip6t_ah)),
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.userspacesize = XT_ALIGN(sizeof(struct ip6t_ah)),
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.help = ah_help,
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.init = ah_init,
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.print = ah_print,
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.save = ah_save,
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.x6_parse = ah_parse,
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.x6_options = ah_opts,
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.xlate = ah_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(&ah_mt6_reg);
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}
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