+++ /dev/null
-/* Shared library add-on to ip6tables to add AH support. */
-#include <stdio.h>
-#include <netdb.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-#include <errno.h>
-#include <ip6tables.h>
-#include <linux/netfilter_ipv6/ip6t_ah.h>
-
-/* Function which prints out usage message. */
-static void ah_help(void)
-{
- printf(
-"ah match options:\n"
-" --ahspi [!] spi[:spi] match spi (range)\n"
-" --ahlen [!] length total length of this header\n"
-" --ahres check the reserved filed, too\n");
-}
-
-static const struct option ah_opts[] = {
- { .name = "ahspi", .has_arg = 1, .val = '1' },
- { .name = "ahlen", .has_arg = 1, .val = '2' },
- { .name = "ahres", .has_arg = 0, .val = '3' },
- { .name = NULL }
-};
-
-static u_int32_t
-parse_ah_spi(const char *spistr, const char *typestr)
-{
- unsigned long int spi;
- char* ep;
-
- spi = strtoul(spistr, &ep, 0);
-
- if ( spistr == ep )
- exit_error(PARAMETER_PROBLEM,
- "AH no valid digits in %s `%s'", typestr, spistr);
-
- if ( spi == ULONG_MAX && errno == ERANGE )
- exit_error(PARAMETER_PROBLEM,
- "%s `%s' specified too big: would overflow",
- typestr, spistr);
-
- if ( *spistr != '\0' && *ep != '\0' )
- exit_error(PARAMETER_PROBLEM,
- "AH error parsing %s `%s'", typestr, spistr);
-
- return (u_int32_t) spi;
-}
-
-static void
-parse_ah_spis(const char *spistring, u_int32_t *spis)
-{
- char *buffer;
- char *cp;
-
- buffer = strdup(spistring);
- if ((cp = strchr(buffer, ':')) == NULL)
- spis[0] = spis[1] = parse_ah_spi(buffer, "spi");
- else {
- *cp = '\0';
- cp++;
-
- spis[0] = buffer[0] ? parse_ah_spi(buffer, "spi") : 0;
- spis[1] = cp[0] ? parse_ah_spi(cp, "spi") : 0xFFFFFFFF;
- }
- free(buffer);
-}
-
-/* Initialize the match. */
-static void ah_init(struct xt_entry_match *m)
-{
- struct ip6t_ah *ahinfo = (struct ip6t_ah *)m->data;
-
- ahinfo->spis[1] = 0xFFFFFFFF;
- ahinfo->hdrlen = 0;
- ahinfo->hdrres = 0;
-}
-
-/* Function which parses command options; returns true if it
- ate an option */
-static int ah_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct ip6t_ah *ahinfo = (struct ip6t_ah *)(*match)->data;
-
- switch (c) {
- case '1':
- if (*flags & IP6T_AH_SPI)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--ahspi' allowed");
- check_inverse(optarg, &invert, &optind, 0);
- parse_ah_spis(argv[optind-1], ahinfo->spis);
- if (invert)
- ahinfo->invflags |= IP6T_AH_INV_SPI;
- *flags |= IP6T_AH_SPI;
- break;
- case '2':
- if (*flags & IP6T_AH_LEN)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--ahlen' allowed");
- check_inverse(optarg, &invert, &optind, 0);
- ahinfo->hdrlen = parse_ah_spi(argv[optind-1], "length");
- if (invert)
- ahinfo->invflags |= IP6T_AH_INV_LEN;
- *flags |= IP6T_AH_LEN;
- break;
- case '3':
- if (*flags & IP6T_AH_RES)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--ahres' allowed");
- ahinfo->hdrres = 1;
- *flags |= IP6T_AH_RES;
- break;
- default:
- return 0;
- }
-
- return 1;
-}
-
-static void
-print_spis(const char *name, u_int32_t min, u_int32_t max,
- int invert)
-{
- const char *inv = invert ? "!" : "";
-
- if (min != 0 || max != 0xFFFFFFFF || invert) {
- if (min == max)
- printf("%s:%s%u ", name, inv, min);
- else
- printf("%ss:%s%u:%u ", name, inv, min, max);
- }
-}
-
-static void
-print_len(const char *name, u_int32_t len, int invert)
-{
- const char *inv = invert ? "!" : "";
-
- if (len != 0 || invert)
- printf("%s:%s%u ", name, inv, len);
-}
-
-/* Prints out the union ip6t_matchinfo. */
-static void ah_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
-{
- const struct ip6t_ah *ah = (struct ip6t_ah *)match->data;
-
- printf("ah ");
- print_spis("spi", ah->spis[0], ah->spis[1],
- ah->invflags & IP6T_AH_INV_SPI);
- print_len("length", ah->hdrlen,
- ah->invflags & IP6T_AH_INV_LEN);
-
- if (ah->hdrres)
- printf("reserved ");
-
- if (ah->invflags & ~IP6T_AH_INV_MASK)
- printf("Unknown invflags: 0x%X ",
- ah->invflags & ~IP6T_AH_INV_MASK);
-}
-
-/* Saves the union ip6t_matchinfo in parsable form to stdout. */
-static void ah_save(const void *ip, const struct xt_entry_match *match)
-{
- const struct ip6t_ah *ahinfo = (struct ip6t_ah *)match->data;
-
- if (!(ahinfo->spis[0] == 0
- && ahinfo->spis[1] == 0xFFFFFFFF)) {
- printf("--ahspi %s",
- (ahinfo->invflags & IP6T_AH_INV_SPI) ? "! " : "");
- if (ahinfo->spis[0]
- != ahinfo->spis[1])
- printf("%u:%u ",
- ahinfo->spis[0],
- ahinfo->spis[1]);
- else
- printf("%u ",
- ahinfo->spis[0]);
- }
-
- if (ahinfo->hdrlen != 0 || (ahinfo->invflags & IP6T_AH_INV_LEN) ) {
- printf("--ahlen %s%u ",
- (ahinfo->invflags & IP6T_AH_INV_LEN) ? "! " : "",
- ahinfo->hdrlen);
- }
-
- if (ahinfo->hdrres != 0 )
- printf("--ahres ");
-}
-
-static struct xtables_match ah_mt6_reg = {
- .name = "ah",
- .version = XTABLES_VERSION,
- .family = PF_INET6,
- .size = XT_ALIGN(sizeof(struct ip6t_ah)),
- .userspacesize = XT_ALIGN(sizeof(struct ip6t_ah)),
- .help = ah_help,
- .init = ah_init,
- .parse = ah_parse,
- .print = ah_print,
- .save = ah_save,
- .extra_opts = ah_opts,
-};
-
-void
-_init(void)
-{
- xtables_register_match(&ah_mt6_reg);
-}
git://git.onelab.eu / iptables.git / blobdiff