+++ /dev/null
-/* Shared library add-on to iptables to add ICMP support. */
-#include <stdio.h>
-#include <netdb.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-#include <ip6tables.h>
-#include <linux/netfilter_ipv6/ip6_tables.h>
-
-struct icmpv6_names {
- const char *name;
- u_int8_t type;
- u_int8_t code_min, code_max;
-};
-
-static const struct icmpv6_names icmpv6_codes[] = {
- { "destination-unreachable", 1, 0, 0xFF },
- { "no-route", 1, 0, 0 },
- { "communication-prohibited", 1, 1, 1 },
- { "address-unreachable", 1, 3, 3 },
- { "port-unreachable", 1, 4, 4 },
-
- { "packet-too-big", 2, 0, 0xFF },
-
- { "time-exceeded", 3, 0, 0xFF },
- /* Alias */ { "ttl-exceeded", 3, 0, 0xFF },
- { "ttl-zero-during-transit", 3, 0, 0 },
- { "ttl-zero-during-reassembly", 3, 1, 1 },
-
- { "parameter-problem", 4, 0, 0xFF },
- { "bad-header", 4, 0, 0 },
- { "unknown-header-type", 4, 1, 1 },
- { "unknown-option", 4, 2, 2 },
-
- { "echo-request", 128, 0, 0xFF },
- /* Alias */ { "ping", 128, 0, 0xFF },
-
- { "echo-reply", 129, 0, 0xFF },
- /* Alias */ { "pong", 129, 0, 0xFF },
-
- { "router-solicitation", 133, 0, 0xFF },
-
- { "router-advertisement", 134, 0, 0xFF },
-
- { "neighbour-solicitation", 135, 0, 0xFF },
- /* Alias */ { "neighbor-solicitation", 135, 0, 0xFF },
-
- { "neighbour-advertisement", 136, 0, 0xFF },
- /* Alias */ { "neighbor-advertisement", 136, 0, 0xFF },
-
- { "redirect", 137, 0, 0xFF },
-
-};
-
-static void
-print_icmpv6types(void)
-{
- unsigned int i;
- printf("Valid ICMPv6 Types:");
-
- for (i = 0; i < sizeof(icmpv6_codes)/sizeof(struct icmpv6_names); i++) {
- if (i && icmpv6_codes[i].type == icmpv6_codes[i-1].type) {
- if (icmpv6_codes[i].code_min == icmpv6_codes[i-1].code_min
- && (icmpv6_codes[i].code_max
- == icmpv6_codes[i-1].code_max))
- printf(" (%s)", icmpv6_codes[i].name);
- else
- printf("\n %s", icmpv6_codes[i].name);
- }
- else
- printf("\n%s", icmpv6_codes[i].name);
- }
- printf("\n");
-}
-
-/* Function which prints out usage message. */
-static void icmp6_help(void)
-{
- printf(
-"icmpv6 match options:\n"
-" --icmpv6-type [!] typename match icmpv6 type\n"
-" (or numeric type or type/code)\n");
- print_icmpv6types();
-}
-
-static const struct option icmp6_opts[] = {
- { "icmpv6-type", 1, NULL, '1' },
- { .name = NULL }
-};
-
-static void
-parse_icmpv6(const char *icmpv6type, u_int8_t *type, u_int8_t code[])
-{
- unsigned int limit = sizeof(icmpv6_codes)/sizeof(struct icmpv6_names);
- unsigned int match = limit;
- unsigned int i;
-
- for (i = 0; i < limit; i++) {
- if (strncasecmp(icmpv6_codes[i].name, icmpv6type, strlen(icmpv6type))
- == 0) {
- if (match != limit)
- exit_error(PARAMETER_PROBLEM,
- "Ambiguous ICMPv6 type `%s':"
- " `%s' or `%s'?",
- icmpv6type,
- icmpv6_codes[match].name,
- icmpv6_codes[i].name);
- match = i;
- }
- }
-
- if (match != limit) {
- *type = icmpv6_codes[match].type;
- code[0] = icmpv6_codes[match].code_min;
- code[1] = icmpv6_codes[match].code_max;
- } else {
- char *slash;
- char buffer[strlen(icmpv6type) + 1];
- unsigned int number;
-
- strcpy(buffer, icmpv6type);
- slash = strchr(buffer, '/');
-
- if (slash)
- *slash = '\0';
-
- if (string_to_number(buffer, 0, 255, &number) == -1)
- exit_error(PARAMETER_PROBLEM,
- "Invalid ICMPv6 type `%s'\n", buffer);
- *type = number;
- if (slash) {
- if (string_to_number(slash+1, 0, 255, &number) == -1)
- exit_error(PARAMETER_PROBLEM,
- "Invalid ICMPv6 code `%s'\n",
- slash+1);
- code[0] = code[1] = number;
- } else {
- code[0] = 0;
- code[1] = 0xFF;
- }
- }
-}
-
-/* Initialize the match. */
-static void icmp6_init(struct xt_entry_match *m)
-{
- struct ip6t_icmp *icmpv6info = (struct ip6t_icmp *)m->data;
-
- icmpv6info->code[1] = 0xFF;
-}
-
-/* Function which parses command options; returns true if it
- ate an option */
-static int icmp6_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct ip6t_icmp *icmpv6info = (struct ip6t_icmp *)(*match)->data;
-
- switch (c) {
- case '1':
- if (*flags == 1)
- exit_error(PARAMETER_PROBLEM,
- "icmpv6 match: only use --icmpv6-type once!");
- check_inverse(optarg, &invert, &optind, 0);
- parse_icmpv6(argv[optind-1], &icmpv6info->type,
- icmpv6info->code);
- if (invert)
- icmpv6info->invflags |= IP6T_ICMP_INV;
- *flags = 1;
- break;
-
- default:
- return 0;
- }
-
- return 1;
-}
-
-static void print_icmpv6type(u_int8_t type,
- u_int8_t code_min, u_int8_t code_max,
- int invert,
- int numeric)
-{
- if (!numeric) {
- unsigned int i;
-
- for (i = 0;
- i < sizeof(icmpv6_codes)/sizeof(struct icmpv6_names);
- i++) {
- if (icmpv6_codes[i].type == type
- && icmpv6_codes[i].code_min == code_min
- && icmpv6_codes[i].code_max == code_max)
- break;
- }
-
- if (i != sizeof(icmpv6_codes)/sizeof(struct icmpv6_names)) {
- printf("%s%s ",
- invert ? "!" : "",
- icmpv6_codes[i].name);
- return;
- }
- }
-
- if (invert)
- printf("!");
-
- printf("type %u", type);
- if (code_min == 0 && code_max == 0xFF)
- printf(" ");
- else if (code_min == code_max)
- printf(" code %u ", code_min);
- else
- printf(" codes %u-%u ", code_min, code_max);
-}
-
-/* Prints out the union ipt_matchinfo. */
-static void icmp6_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
-{
- const struct ip6t_icmp *icmpv6 = (struct ip6t_icmp *)match->data;
-
- printf("ipv6-icmp ");
- print_icmpv6type(icmpv6->type, icmpv6->code[0], icmpv6->code[1],
- icmpv6->invflags & IP6T_ICMP_INV,
- numeric);
-
- if (icmpv6->invflags & ~IP6T_ICMP_INV)
- printf("Unknown invflags: 0x%X ",
- icmpv6->invflags & ~IP6T_ICMP_INV);
-}
-
-/* Saves the match in parsable form to stdout. */
-static void icmp6_save(const void *ip, const struct xt_entry_match *match)
-{
- const struct ip6t_icmp *icmpv6 = (struct ip6t_icmp *)match->data;
-
- if (icmpv6->invflags & IP6T_ICMP_INV)
- printf("! ");
-
- printf("--icmpv6-type %u", icmpv6->type);
- if (icmpv6->code[0] != 0 || icmpv6->code[1] != 0xFF)
- printf("/%u", icmpv6->code[0]);
- printf(" ");
-}
-
-static void icmp6_check(unsigned int flags)
-{
- if (!flags)
- exit_error(PARAMETER_PROBLEM,
- "icmpv6 match: You must specify `--icmpv6-type'");
-}
-
-static struct xtables_match icmp6_mt6_reg = {
- .name = "icmp6",
- .version = XTABLES_VERSION,
- .family = PF_INET6,
- .size = XT_ALIGN(sizeof(struct ip6t_icmp)),
- .userspacesize = XT_ALIGN(sizeof(struct ip6t_icmp)),
- .help = icmp6_help,
- .init = icmp6_init,
- .parse = icmp6_parse,
- .final_check = icmp6_check,
- .print = icmp6_print,
- .save = icmp6_save,
- .extra_opts = icmp6_opts,
-};
-
-void _init(void)
-{
- xtables_register_match(&icmp6_mt6_reg);
-}
git://git.onelab.eu / iptables.git / blobdiff