| /* Shared library add-on to iptables for FTOS |
| * |
| * (C) 2000 by Matthew G. Marsh <mgm@paktronix.com> |
| * |
| * This program is distributed under the terms of GNU GPL v2, 1991 |
| * |
| * libipt_FTOS.c borrowed heavily from libipt_TOS.c 11/09/2000 |
| * |
| */ |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| |
| #include <iptables.h> |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| #include <linux/netfilter_ipv4/ipt_FTOS.h> |
| |
| struct finfo { |
| struct ipt_entry_target t; |
| u_int8_t ftos; |
| }; |
| |
| static void init(struct ipt_entry_target *t, unsigned int *nfcache) |
| { |
| } |
| |
| static void help(void) |
| { |
| printf( |
| "FTOS target options\n" |
| " --set-ftos value Set TOS field in packet header to value\n" |
| " This value can be in decimal (ex: 32)\n" |
| " or in hex (ex: 0x20)\n" |
| ); |
| } |
| |
| static struct option opts[] = { |
| { "set-ftos", 1, 0, 'F' }, |
| { 0 } |
| }; |
| |
| static void |
| parse_ftos(const unsigned char *s, struct ipt_FTOS_info *finfo) |
| { |
| unsigned int ftos; |
| |
| if (string_to_number(s, 0, 255, &ftos) == -1) |
| exit_error(PARAMETER_PROBLEM, |
| "Invalid ftos `%s'\n", s); |
| finfo->ftos = (u_int8_t )ftos; |
| return; |
| } |
| |
| static int |
| parse(int c, char **argv, int invert, unsigned int *flags, |
| const struct ipt_entry *entry, |
| struct ipt_entry_target **target) |
| { |
| struct ipt_FTOS_info *finfo |
| = (struct ipt_FTOS_info *)(*target)->data; |
| |
| switch (c) { |
| case 'F': |
| if (*flags) |
| exit_error(PARAMETER_PROBLEM, |
| "FTOS target: Only use --set-ftos ONCE!"); |
| parse_ftos(optarg, finfo); |
| *flags = 1; |
| break; |
| |
| default: |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void |
| final_check(unsigned int flags) |
| { |
| if (!flags) |
| exit_error(PARAMETER_PROBLEM, |
| "FTOS target: Parameter --set-ftos is required"); |
| } |
| |
| static void |
| print_ftos(u_int8_t ftos, int numeric) |
| { |
| printf("0x%02x ", ftos); |
| } |
| |
| /* Prints out the targinfo. */ |
| static void |
| print(const struct ipt_ip *ip, |
| const struct ipt_entry_target *target, |
| int numeric) |
| { |
| const struct ipt_FTOS_info *finfo = |
| (const struct ipt_FTOS_info *)target->data; |
| printf("TOS set "); |
| print_ftos(finfo->ftos, numeric); |
| } |
| |
| /* Saves the union ipt_targinfo in parsable form to stdout. */ |
| static void |
| save(const struct ipt_ip *ip, const struct ipt_entry_target *target) |
| { |
| const struct ipt_FTOS_info *finfo = |
| (const struct ipt_FTOS_info *)target->data; |
| |
| printf("--set-ftos 0x%02x ", finfo->ftos); |
| } |
| |
| static |
| struct iptables_target ftos |
| = { NULL, |
| "FTOS", |
| IPTABLES_VERSION, |
| IPT_ALIGN(sizeof(struct ipt_FTOS_info)), |
| IPT_ALIGN(sizeof(struct ipt_FTOS_info)), |
| &help, |
| &init, |
| &parse, |
| &final_check, |
| &print, |
| &save, |
| opts |
| }; |
| |
| void _init(void) |
| { |
| register_target(&ftos); |
| } |