| /* Shared library add-on to iptables to add ROUTE v6 target support. |
| * Author : Cedric de Launois, <delaunois@info.ucl.ac.be> |
| * v 1.1 2004/11/23 |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <arpa/inet.h> |
| |
| #include <ip6tables.h> |
| #include <linux/netfilter_ipv6/ip6_tables.h> |
| #include <linux/netfilter_ipv6/ip6t_ROUTE.h> |
| |
| /* compile IP6T_ROUTE_TEE support even if kernel headers are unpatched */ |
| #ifndef IP6T_ROUTE_TEE |
| #define IP6T_ROUTE_TEE 0x02 |
| #endif |
| |
| /* Function which prints out usage message. */ |
| static void |
| help(void) |
| { |
| printf( |
| "ROUTE target v%s options:\n" |
| " --oif \tifname \t\tRoute the packet through `ifname' network interface\n" |
| " --gw \tip \t\tRoute the packet via this gateway\n" |
| " --continue\t \t\tRoute packet and continue traversing the\n" |
| " \t \t\trules. Not valid with --iif or --tee.\n" |
| " --tee\t \t\tDuplicate packet, route the duplicate,\n" |
| " \t \t\tcontinue traversing with original packet.\n" |
| " \t \t\tNot valid with --iif or --continue.\n" |
| "\n", |
| "1.1"); |
| } |
| |
| static struct option opts[] = { |
| { "oif", 1, 0, '1' }, |
| { "iif", 1, 0, '2' }, |
| { "gw", 1, 0, '3' }, |
| { "continue", 0, 0, '4' }, |
| { "tee", 0, 0, '5' }, |
| { 0 } |
| }; |
| |
| /* Initialize the target. */ |
| static void |
| init(struct ip6t_entry_target *t, unsigned int *nfcache) |
| { |
| struct ip6t_route_target_info *route_info = |
| (struct ip6t_route_target_info*)t->data; |
| |
| route_info->oif[0] = '\0'; |
| route_info->iif[0] = '\0'; |
| route_info->gw[0] = 0; |
| route_info->gw[1] = 0; |
| route_info->gw[2] = 0; |
| route_info->gw[3] = 0; |
| route_info->flags = 0; |
| } |
| |
| |
| #define IP6T_ROUTE_OPT_OIF 0x01 |
| #define IP6T_ROUTE_OPT_IIF 0x02 |
| #define IP6T_ROUTE_OPT_GW 0x04 |
| #define IP6T_ROUTE_OPT_CONTINUE 0x08 |
| #define IP6T_ROUTE_OPT_TEE 0x10 |
| |
| /* Function which parses command options; returns true if it |
| ate an option */ |
| static int |
| parse(int c, char **argv, int invert, unsigned int *flags, |
| const struct ip6t_entry *entry, |
| struct ip6t_entry_target **target) |
| { |
| struct ip6t_route_target_info *route_info = |
| (struct ip6t_route_target_info*)(*target)->data; |
| |
| switch (c) { |
| case '1': |
| if (*flags & IP6T_ROUTE_OPT_OIF) |
| exit_error(PARAMETER_PROBLEM, |
| "Can't specify --oif twice"); |
| |
| if (check_inverse(optarg, &invert, NULL, 0)) |
| exit_error(PARAMETER_PROBLEM, |
| "Unexpected `!' after --oif"); |
| |
| if (strlen(optarg) > sizeof(route_info->oif) - 1) |
| exit_error(PARAMETER_PROBLEM, |
| "Maximum interface name length %u", |
| sizeof(route_info->oif) - 1); |
| |
| strcpy(route_info->oif, optarg); |
| *flags |= IP6T_ROUTE_OPT_OIF; |
| break; |
| |
| case '2': |
| exit_error(PARAMETER_PROBLEM, |
| "--iif option not implemented"); |
| break; |
| |
| case '3': |
| if (*flags & IP6T_ROUTE_OPT_GW) |
| exit_error(PARAMETER_PROBLEM, |
| "Can't specify --gw twice"); |
| |
| if (check_inverse(optarg, &invert, NULL, 0)) |
| exit_error(PARAMETER_PROBLEM, |
| "Unexpected `!' after --gw"); |
| |
| if (!inet_pton(AF_INET6, optarg, (struct in6_addr*)&route_info->gw)) { |
| exit_error(PARAMETER_PROBLEM, |
| "Invalid IPv6 address %s", |
| optarg); |
| } |
| |
| *flags |= IP6T_ROUTE_OPT_GW; |
| break; |
| |
| case '4': |
| if (*flags & IP6T_ROUTE_OPT_CONTINUE) |
| exit_error(PARAMETER_PROBLEM, |
| "Can't specify --continue twice"); |
| if (*flags & IP6T_ROUTE_OPT_TEE) |
| exit_error(PARAMETER_PROBLEM, |
| "Can't specify --continue AND --tee"); |
| |
| route_info->flags |= IP6T_ROUTE_CONTINUE; |
| *flags |= IP6T_ROUTE_OPT_CONTINUE; |
| |
| break; |
| |
| case '5': |
| if (*flags & IP6T_ROUTE_OPT_TEE) |
| exit_error(PARAMETER_PROBLEM, |
| "Can't specify --tee twice"); |
| if (*flags & IP6T_ROUTE_OPT_CONTINUE) |
| exit_error(PARAMETER_PROBLEM, |
| "Can't specify --tee AND --continue"); |
| |
| route_info->flags |= IP6T_ROUTE_TEE; |
| *flags |= IP6T_ROUTE_OPT_TEE; |
| |
| break; |
| |
| default: |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| |
| static void |
| final_check(unsigned int flags) |
| { |
| if (!flags) |
| exit_error(PARAMETER_PROBLEM, |
| "ROUTE target: oif or gw option required"); |
| } |
| |
| |
| /* Prints out the targinfo. */ |
| static void |
| print(const struct ip6t_ip6 *ip, |
| const struct ip6t_entry_target *target, |
| int numeric) |
| { |
| const struct ip6t_route_target_info *route_info |
| = (const struct ip6t_route_target_info *)target->data; |
| |
| printf("ROUTE "); |
| |
| if (route_info->oif[0]) |
| printf("oif:%s ", route_info->oif); |
| |
| if (route_info->gw[0] |
| || route_info->gw[1] |
| || route_info->gw[2] |
| || route_info->gw[3]) { |
| char address[INET6_ADDRSTRLEN]; |
| printf("gw:%s ", inet_ntop(AF_INET6, route_info->gw, address, INET6_ADDRSTRLEN)); |
| } |
| |
| if (route_info->flags & IP6T_ROUTE_CONTINUE) |
| printf("continue"); |
| |
| if (route_info->flags & IP6T_ROUTE_TEE) |
| printf("tee"); |
| |
| } |
| |
| |
| static void save(const struct ip6t_ip6 *ip, |
| const struct ip6t_entry_target *target) |
| { |
| const struct ip6t_route_target_info *route_info |
| = (const struct ip6t_route_target_info *)target->data; |
| |
| if (route_info->oif[0]) |
| printf("--oif %s ", route_info->oif); |
| |
| if (route_info->gw[0] |
| || route_info->gw[1] |
| || route_info->gw[2] |
| || route_info->gw[3]) { |
| char address[INET6_ADDRSTRLEN]; |
| printf("--gw %s ", inet_ntop(AF_INET6, route_info->gw, address, INET6_ADDRSTRLEN)); |
| } |
| |
| if (route_info->flags & IP6T_ROUTE_CONTINUE) |
| printf("--continue "); |
| |
| if (route_info->flags & IP6T_ROUTE_TEE) |
| printf("--tee "); |
| } |
| |
| |
| static struct ip6tables_target route = { |
| .name = "ROUTE", |
| .version = IPTABLES_VERSION, |
| .size = IP6T_ALIGN(sizeof(struct ip6t_route_target_info)), |
| .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_route_target_info)), |
| .help = &help, |
| .init = &init, |
| .parse = &parse, |
| .final_check = &final_check, |
| .print = &print, |
| .save = &save, |
| .extra_opts = opts, |
| }; |
| |
| void _init(void) |
| { |
| register_target6(&route); |
| } |