+++ /dev/null
-/* ipv6header match - matches IPv6 packets based
-on whether they contain certain headers */
-
-/* Original idea: Brad Chapman
- * Rewritten by: Andras Kis-Szabo <kisza@sch.bme.hu> */
-
-#include <getopt.h>
-#include <ip6tables.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <netdb.h>
-#include <sys/types.h>
-
-#include <linux/netfilter_ipv6/ip6_tables.h>
-#include <linux/netfilter_ipv6/ip6t_ipv6header.h>
-
-/* This maybe required
-#include <linux/in.h>
-#include <linux/in6.h>
-*/
-
-
-/* A few hardcoded protocols for 'all' and in case the user has no
- * /etc/protocols */
-struct pprot {
- char *name;
- u_int8_t num;
-};
-
-struct numflag {
- u_int8_t proto;
- u_int8_t flag;
-};
-
-static const struct pprot chain_protos[] = {
- { "hop-by-hop", IPPROTO_HOPOPTS },
- { "protocol", IPPROTO_RAW },
- { "hop", IPPROTO_HOPOPTS },
- { "dst", IPPROTO_DSTOPTS },
- { "route", IPPROTO_ROUTING },
- { "frag", IPPROTO_FRAGMENT },
- { "auth", IPPROTO_AH },
- { "esp", IPPROTO_ESP },
- { "none", IPPROTO_NONE },
- { "prot", IPPROTO_RAW },
- { "0", IPPROTO_HOPOPTS },
- { "60", IPPROTO_DSTOPTS },
- { "43", IPPROTO_ROUTING },
- { "44", IPPROTO_FRAGMENT },
- { "51", IPPROTO_AH },
- { "50", IPPROTO_ESP },
- { "59", IPPROTO_NONE },
- { "255", IPPROTO_RAW },
- /* { "all", 0 }, */
-};
-
-static const struct numflag chain_flags[] = {
- { IPPROTO_HOPOPTS, MASK_HOPOPTS },
- { IPPROTO_DSTOPTS, MASK_DSTOPTS },
- { IPPROTO_ROUTING, MASK_ROUTING },
- { IPPROTO_FRAGMENT, MASK_FRAGMENT },
- { IPPROTO_AH, MASK_AH },
- { IPPROTO_ESP, MASK_ESP },
- { IPPROTO_NONE, MASK_NONE },
- { IPPROTO_RAW, MASK_PROTO },
-};
-
-static char *
-proto_to_name(u_int8_t proto, int nolookup)
-{
- unsigned int i;
-
- if (proto && !nolookup) {
- struct protoent *pent = getprotobynumber(proto);
- if (pent)
- return pent->p_name;
- }
-
- for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
- if (chain_protos[i].num == proto)
- return chain_protos[i].name;
-
- return NULL;
-}
-
-static u_int16_t
-name_to_proto(const char *s)
-{
- unsigned int proto=0;
- struct protoent *pent;
-
- if ((pent = getprotobyname(s)))
- proto = pent->p_proto;
- else {
- unsigned int i;
- for (i = 0;
- i < sizeof(chain_protos)/sizeof(struct pprot);
- i++) {
- if (strcmp(s, chain_protos[i].name) == 0) {
- proto = chain_protos[i].num;
- break;
- }
- }
-
- if (i == sizeof(chain_protos)/sizeof(struct pprot))
- exit_error(PARAMETER_PROBLEM,
- "unknown header `%s' specified",
- s);
- }
-
- return (u_int16_t)proto;
-}
-
-static unsigned int
-add_proto_to_mask(int proto){
- unsigned int i=0, flag=0;
-
- for (i = 0;
- i < sizeof(chain_flags)/sizeof(struct numflag);
- i++) {
- if (proto == chain_flags[i].proto){
- flag = chain_flags[i].flag;
- break;
- }
- }
-
- if (i == sizeof(chain_flags)/sizeof(struct numflag))
- exit_error(PARAMETER_PROBLEM,
- "unknown header `%d' specified",
- proto);
-
- return flag;
-}
-
-static void ipv6header_help(void)
-{
- printf(
-"ipv6header match options:\n"
-"--header [!] headers Type of header to match, by name\n"
-" names: hop,dst,route,frag,auth,esp,none,proto\n"
-" long names: hop-by-hop,ipv6-opts,ipv6-route,\n"
-" ipv6-frag,ah,esp,ipv6-nonxt,protocol\n"
-" numbers: 0,60,43,44,51,50,59\n"
-"--soft The header CONTAINS the specified extensions\n");
-}
-
-static const struct option ipv6header_opts[] = {
- { "header", 1, NULL, '1' },
- { "soft", 0, NULL, '2' },
- { .name = NULL }
-};
-
-static void ipv6header_init(struct xt_entry_match *m)
-{
- struct ip6t_ipv6header_info *info = (struct ip6t_ipv6header_info *)m->data;
-
- info->matchflags = 0x00;
- info->invflags = 0x00;
- info->modeflag = 0x00;
-}
-
-static unsigned int
-parse_header(const char *flags) {
- unsigned int ret = 0;
- char *ptr;
- char *buffer;
-
- buffer = strdup(flags);
-
- for (ptr = strtok(buffer, ","); ptr; ptr = strtok(NULL, ","))
- ret |= add_proto_to_mask(name_to_proto(ptr));
-
- free(buffer);
- return ret;
-}
-
-#define IPV6_HDR_HEADER 0x01
-#define IPV6_HDR_SOFT 0x02
-
-/* Parses command options; returns 0 if it ate an option */
-static int
-ipv6header_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct ip6t_ipv6header_info *info = (struct ip6t_ipv6header_info *)(*match)->data;
-
- switch (c) {
- case '1' :
- /* Parse the provided header names */
- if (*flags & IPV6_HDR_HEADER)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--header' allowed");
-
- check_inverse(optarg, &invert, &optind, 0);
-
- if (! (info->matchflags = parse_header(argv[optind-1])) )
- exit_error(PARAMETER_PROBLEM, "ip6t_ipv6header: cannot parse header names");
-
- if (invert)
- info->invflags |= 0xFF;
- *flags |= IPV6_HDR_HEADER;
- break;
- case '2' :
- /* Soft-mode requested? */
- if (*flags & IPV6_HDR_SOFT)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--soft' allowed");
-
- info->modeflag |= 0xFF;
- *flags |= IPV6_HDR_SOFT;
- break;
- default:
- return 0;
- }
-
- return 1;
-}
-
-/* Checks the flags variable */
-static void ipv6header_check(unsigned int flags)
-{
- if (!flags) exit_error(PARAMETER_PROBLEM, "ip6t_ipv6header: no options specified");
-}
-
-static void
-print_header(u_int8_t flags){
- int have_flag = 0;
-
- while (flags) {
- unsigned int i;
-
- for (i = 0; (flags & chain_flags[i].flag) == 0; i++);
-
- if (have_flag)
- printf(",");
-
- printf("%s", proto_to_name(chain_flags[i].proto,0));
- have_flag = 1;
-
- flags &= ~chain_flags[i].flag;
- }
-
- if (!have_flag)
- printf("NONE");
-}
-
-/* Prints out the match */
-static void ipv6header_print(const void *ip,
- const struct xt_entry_match *match, int numeric)
-{
- const struct ip6t_ipv6header_info *info = (const struct ip6t_ipv6header_info *)match->data;
- printf("ipv6header ");
-
- if (info->matchflags || info->invflags) {
- printf("flags:%s", info->invflags ? "!" : "");
- if (numeric)
- printf("0x%02X ", info->matchflags);
- else {
- print_header(info->matchflags);
- printf(" ");
- }
- }
-
- if (info->modeflag)
- printf("soft ");
-
- return;
-}
-
-/* Saves the match */
-static void ipv6header_save(const void *ip, const struct xt_entry_match *match)
-{
-
- const struct ip6t_ipv6header_info *info = (const struct ip6t_ipv6header_info *)match->data;
-
- printf("--header ");
- printf("%s", info->invflags ? "!" : "");
- print_header(info->matchflags);
- printf(" ");
- if (info->modeflag)
- printf("--soft ");
-
- return;
-}
-
-static struct xtables_match ipv6header_mt6_reg = {
- .name = "ipv6header",
- .version = XTABLES_VERSION,
- .family = PF_INET6,
- .size = XT_ALIGN(sizeof(struct ip6t_ipv6header_info)),
- .userspacesize = XT_ALIGN(sizeof(struct ip6t_ipv6header_info)),
- .help = ipv6header_help,
- .init = ipv6header_init,
- .parse = ipv6header_parse,
- .final_check = ipv6header_check,
- .print = ipv6header_print,
- .save = ipv6header_save,
- .extra_opts = ipv6header_opts,
-};
-
-void _init(void)
-{
- xtables_register_match(&ipv6header_mt6_reg);
-}
git://git.onelab.eu / iptables.git / blobdiff