| /* Shared library add-on to iptables to add IPMARK target support. |
| * (C) 2003 by Grzegorz Janoszka <Grzegorz.Janoszka@pro.onet.pl> |
| * |
| * based on original MARK target |
| * |
| * This program is distributed under the terms of GNU GPL |
| */ |
| #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_IPMARK.h> |
| |
| #define IPT_ADDR_USED 1 |
| #define IPT_AND_MASK_USED 2 |
| #define IPT_OR_MASK_USED 4 |
| |
| struct ipmarkinfo { |
| struct ipt_entry_target t; |
| struct ipt_ipmark_target_info ipmark; |
| }; |
| |
| /* Function which prints out usage message. */ |
| static void |
| help(void) |
| { |
| printf( |
| "IPMARK target v%s options:\n" |
| " --addr src/dst use source or destination ip address\n" |
| " --and-mask value logical AND ip address with this value becomes MARK\n" |
| " --or-mask value logical OR ip address with this value becomes MARK\n" |
| "\n", |
| IPTABLES_VERSION); |
| } |
| |
| static struct option opts[] = { |
| { "addr", 1, 0, '1' }, |
| { "and-mask", 1, 0, '2' }, |
| { "or-mask", 1, 0, '3' }, |
| { 0 } |
| }; |
| |
| /* Initialize the target. */ |
| static void |
| init(struct ipt_entry_target *t, unsigned int *nfcache) |
| { |
| struct ipt_ipmark_target_info *ipmarkinfo = |
| (struct ipt_ipmark_target_info *)t->data; |
| |
| ipmarkinfo->andmask=0xffffffff; |
| ipmarkinfo->ormask=0; |
| |
| } |
| |
| /* 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 ipt_entry *entry, |
| struct ipt_entry_target **target) |
| { |
| struct ipt_ipmark_target_info *ipmarkinfo |
| = (struct ipt_ipmark_target_info *)(*target)->data; |
| |
| switch (c) { |
| char *end; |
| case '1': |
| if(!strcmp(optarg, "src")) ipmarkinfo->addr=IPT_IPMARK_SRC; |
| else if(!strcmp(optarg, "dst")) ipmarkinfo->addr=IPT_IPMARK_DST; |
| else exit_error(PARAMETER_PROBLEM, "Bad addr value `%s' - should be `src' or `dst'", optarg); |
| if (*flags & IPT_ADDR_USED) |
| exit_error(PARAMETER_PROBLEM, |
| "IPMARK target: Can't specify --addr twice"); |
| *flags |= IPT_ADDR_USED; |
| break; |
| |
| case '2': |
| ipmarkinfo->andmask = strtoul(optarg, &end, 0); |
| if (*end != '\0' || end == optarg) |
| exit_error(PARAMETER_PROBLEM, "Bad and-mask value `%s'", optarg); |
| if (*flags & IPT_AND_MASK_USED) |
| exit_error(PARAMETER_PROBLEM, |
| "IPMARK target: Can't specify --and-mask twice"); |
| *flags |= IPT_AND_MASK_USED; |
| break; |
| case '3': |
| ipmarkinfo->ormask = strtoul(optarg, &end, 0); |
| if (*end != '\0' || end == optarg) |
| exit_error(PARAMETER_PROBLEM, "Bad or-mask value `%s'", optarg); |
| if (*flags & IPT_OR_MASK_USED) |
| exit_error(PARAMETER_PROBLEM, |
| "IPMARK target: Can't specify --or-mask twice"); |
| *flags |= IPT_OR_MASK_USED; |
| break; |
| |
| default: |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void |
| final_check(unsigned int flags) |
| { |
| if (!(flags & IPT_ADDR_USED)) |
| exit_error(PARAMETER_PROBLEM, |
| "IPMARK target: Parameter --addr is required"); |
| if (!(flags & (IPT_AND_MASK_USED | IPT_OR_MASK_USED))) |
| exit_error(PARAMETER_PROBLEM, |
| "IPMARK target: Parameter --and-mask or --or-mask is required"); |
| } |
| |
| /* Prints out the targinfo. */ |
| static void |
| print(const struct ipt_ip *ip, |
| const struct ipt_entry_target *target, |
| int numeric) |
| { |
| const struct ipt_ipmark_target_info *ipmarkinfo = |
| (const struct ipt_ipmark_target_info *)target->data; |
| |
| if(ipmarkinfo->addr == IPT_IPMARK_SRC) |
| printf("IPMARK src"); |
| else |
| printf("IPMARK dst"); |
| printf(" ip and 0x%lx or 0x%lx", ipmarkinfo->andmask, ipmarkinfo->ormask); |
| } |
| |
| /* 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_ipmark_target_info *ipmarkinfo = |
| (const struct ipt_ipmark_target_info *)target->data; |
| |
| if(ipmarkinfo->addr == IPT_IPMARK_SRC) |
| printf("--addr=src "); |
| else |
| printf("--addr=dst "); |
| if(ipmarkinfo->andmask != 0xffffffff) |
| printf("--and-mask 0x%lx ", ipmarkinfo->andmask); |
| if(ipmarkinfo->ormask != 0) |
| printf("--or-mask 0x%lx ", ipmarkinfo->ormask); |
| } |
| |
| static struct iptables_target ipmark = { |
| .next = NULL, |
| .name = "IPMARK", |
| .version = IPTABLES_VERSION, |
| .size = IPT_ALIGN(sizeof(struct ipt_ipmark_target_info)), |
| .userspacesize = IPT_ALIGN(sizeof(struct ipt_ipmark_target_info)), |
| .help = &help, |
| .init = &init, |
| .parse = &parse, |
| .final_check = &final_check, |
| .print = &print, |
| .save = &save, |
| .extra_opts = opts |
| }; |
| |
| void _init(void) |
| { |
| register_target(&ipmark); |
| } |