diff options
Diffstat (limited to 'extensions/libip6t_mh.c')
| -rw-r--r-- | extensions/libip6t_mh.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/extensions/libip6t_mh.c b/extensions/libip6t_mh.c new file mode 100644 index 00000000..2475b4d1 --- /dev/null +++ b/extensions/libip6t_mh.c @@ -0,0 +1,252 @@ +/* Shared library add-on to ip6tables to add mobility header support. */ +/* + * Copyright (C)2006 USAGI/WIDE Project + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Author: + * Masahide NAKAMURA @USAGI <masahide.nakamura.cz@hitachi.com> + * + * Based on libip6t_{icmpv6,udp}.c + */ +#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> +#include <linux/netfilter_ipv6/ip6t_mh.h> + +struct mh_name { + const char *name; + u_int8_t type; +}; + +static const struct mh_name mh_names[] = { + { "binding-refresh-request", 0, }, + /* Alias */ { "brr", 0, }, + { "home-test-init", 1, }, + /* Alias */ { "hoti", 1, }, + { "careof-test-init", 2, }, + /* Alias */ { "coti", 2, }, + { "home-test", 3, }, + /* Alias */ { "hot", 3, }, + { "careof-test", 4, }, + /* Alias */ { "cot", 4, }, + { "binding-update", 5, }, + /* Alias */ { "bu", 5, }, + { "binding-acknowledgement", 6, }, + /* Alias */ { "ba", 6, }, + { "binding-error", 7, }, + /* Alias */ { "be", 7, }, +}; + +static void print_types_all(void) +{ + unsigned int i; + printf("Valid MH types:"); + + for (i = 0; i < sizeof(mh_names)/sizeof(struct mh_name); i++) { + if (i && mh_names[i].type == mh_names[i-1].type) + printf(" (%s)", mh_names[i].name); + else + printf("\n%s", mh_names[i].name); + } + printf("\n"); +} + +static void help(void) +{ + printf( +"MH v%s options:\n" +" --mh-type [!] type[:type] match mh type\n", +IPTABLES_VERSION); + print_types_all(); +} + +static void init(struct ip6t_entry_match *m, unsigned int *nfcache) +{ + struct ip6t_mh *mhinfo = (struct ip6t_mh *)m->data; + + mhinfo->types[1] = 0xFF; +} + +static unsigned int name_to_type(const char *name) +{ + int namelen = strlen(name); + unsigned int limit = sizeof(mh_names)/sizeof(struct mh_name); + unsigned int match = limit; + unsigned int i; + + for (i = 0; i < limit; i++) { + if (strncasecmp(mh_names[i].name, name, namelen) == 0) { + int len = strlen(mh_names[i].name); + if (match == limit || len == namelen) + match = i; + } + } + + if (match != limit) { + return mh_names[match].type; + } else { + unsigned int number; + + if (string_to_number(name, 0, 255, &number) == -1) + exit_error(PARAMETER_PROBLEM, + "Invalid MH type `%s'\n", name); + return number; + } +} + +static void parse_mh_types(const char *mhtype, u_int8_t *types) +{ + char *buffer; + char *cp; + + buffer = strdup(mhtype); + if ((cp = strchr(buffer, ':')) == NULL) + types[0] = types[1] = name_to_type(buffer); + else { + *cp = '\0'; + cp++; + + types[0] = buffer[0] ? name_to_type(buffer) : 0; + types[1] = cp[0] ? name_to_type(cp) : 0xFF; + + if (types[0] > types[1]) + exit_error(PARAMETER_PROBLEM, + "Invalid MH type range (min > max)"); + } + free(buffer); +} + +#define MH_TYPES 0x01 + +static int parse(int c, char **argv, int invert, unsigned int *flags, + const struct ip6t_entry *entry, + unsigned int *nfcache, + struct ip6t_entry_match **match) +{ + struct ip6t_mh *mhinfo = (struct ip6t_mh *)(*match)->data; + + switch (c) { + case '1': + if (*flags & MH_TYPES) + exit_error(PARAMETER_PROBLEM, + "Only one `--mh-type' allowed"); + check_inverse(optarg, &invert, &optind, 0); + parse_mh_types(argv[optind-1], mhinfo->types); + if (invert) + mhinfo->invflags |= IP6T_MH_INV_TYPE; + *flags |= MH_TYPES; + break; + + default: + return 0; + } + + return 1; +} + +/* Final check; we don't care. */ +static void final_check(unsigned int flags) +{ +} + +static const char *type_to_name(u_int8_t type) +{ + unsigned int i; + + for (i = 0; i < sizeof(mh_names)/sizeof(struct mh_name); i++) { + if (mh_names[i].type == type) + return mh_names[i].name; + } + + return NULL; +} + +static void print_type(u_int8_t type, int numeric) +{ + const char *name; + if (numeric || !(name = type_to_name(type))) + printf("%u", type); + else + printf("%s", name); +} + +static void print_types(u_int8_t min, u_int8_t max, int invert, int numeric) +{ + const char *inv = invert ? "!" : ""; + + if (min != 0 || max != 0xFF || invert) { + if (min == max) { + printf("%s", inv); + print_type(min, numeric); + } else { + printf("%s", inv); + print_type(min, numeric); + printf(":"); + print_type(max, numeric); + } + printf(" "); + } +} + +static void print(const struct ip6t_ip6 *ip, + const struct ip6t_entry_match *match, + int numeric) +{ + const struct ip6t_mh *mhinfo = (struct ip6t_mh *)match->data; + + printf("mh "); + print_types(mhinfo->types[0], mhinfo->types[1], + mhinfo->invflags & IP6T_MH_INV_TYPE, + numeric); + if (mhinfo->invflags & ~IP6T_MH_INV_MASK) + printf("Unknown invflags: 0x%X ", + mhinfo->invflags & ~IP6T_MH_INV_MASK); +} + +static void save(const struct ip6t_ip6 *ip, + const struct ip6t_entry_match *match) +{ + const struct ip6t_mh *mhinfo = (struct ip6t_mh *)match->data; + + if (mhinfo->types[0] == 0 && mhinfo->types[1] == 0xFF) + return; + + if (mhinfo->invflags & IP6T_MH_INV_TYPE) + printf("! "); + + if (mhinfo->types[0] != mhinfo->types[1]) + printf("--mh-type %u:%u ", mhinfo->types[0], mhinfo->types[1]); + else + printf("--mh-type %u ", mhinfo->types[0]); +} + +static struct option opts[] = { + { "mh-type", 1, 0, '1' }, + {0} +}; + +static struct ip6tables_match mh = { + .name = "mh", + .version = IPTABLES_VERSION, + .size = IP6T_ALIGN(sizeof(struct ip6t_mh)), + .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_mh)), + .help = &help, + .init = &init, + .parse = &parse, + .final_check = &final_check, + .print = &print, + .save = &save, + .extra_opts = opts, +}; + +void _init(void) +{ + register_match6(&mh); +} |