libipt_SNAT.c revision e656e265bc67a55f6e51aa07118f96c058a97798
1e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Shared library add-on to iptables to add source-NAT support. */ 2e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#include <stdio.h> 3e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#include <netdb.h> 4e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#include <string.h> 5e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#include <stdlib.h> 6e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#include <getopt.h> 7e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#include <iptables.h> 8e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher#include <linux/netfilter_ipv4/ip_tables.h> 940d54756cd8a2705e22b36f7aef03bb2c472a10bPatrick McHardy#include <linux/netfilter/nf_nat.h> 10e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 11ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond#define IPT_SNAT_OPT_SOURCE 0x01 12e656e265bc67a55f6e51aa07118f96c058a97798Patrick McHardy#define IPT_SNAT_OPT_RANDOM 0x02 13ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond 14e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Source NAT data consists of a multi-range, indicating where to map 15e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher to. */ 16e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstruct ipt_natinfo 17e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 18e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_entry_target t; 19e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ip_nat_multi_range mr; 20e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 21e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 22e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Function which prints out usage message. */ 23e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void 24e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherhelp(void) 25e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 26e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf( 27e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher"SNAT v%s options:\n" 28ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond" --to-source <ipaddr>[-<ipaddr>][:port-port]" 29ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond"[--random]" 30ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond"\n" 31e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher" Address to map source to.\n" 32e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher" (You can use this more than once)\n\n", 3380fe35d6339b53a12ddaec41885613e4e37ed031Harald WelteIPTABLES_VERSION); 34e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 35e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 36e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic struct option opts[] = { 37e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher { "to-source", 1, 0, '1' }, 38ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond { "random", 0, 0, '2' }, 39e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher { 0 } 40e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 41e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 42e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic struct ipt_natinfo * 43e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherappend_range(struct ipt_natinfo *info, const struct ip_nat_range *range) 44e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 45e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int size; 46e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 47e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* One rangesize already in struct ipt_natinfo */ 48e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher size = IPT_ALIGN(sizeof(*info) + info->mr.rangesize * sizeof(*range)); 49e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 50e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info = realloc(info, size); 51e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!info) 52e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(OTHER_PROBLEM, "Out of memory\n"); 53e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 54228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell info->t.u.target_size = size; 55e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info->mr.range[info->mr.rangesize] = *range; 56e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info->mr.rangesize++; 57e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 58e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return info; 59e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 60e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 61e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Ranges expected in network order. */ 62e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic struct ipt_entry_target * 63e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherparse_to(char *arg, int portok, struct ipt_natinfo *info) 64e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 65e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ip_nat_range range; 66de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte char *colon, *dash, *error; 67e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct in_addr *ip; 68e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 69e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memset(&range, 0, sizeof(range)); 70e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher colon = strchr(arg, ':'); 71e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 72e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon) { 73e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int port; 74e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 75e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!portok) 76e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 77e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Need TCP or UDP with port specification"); 78e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 79e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.flags |= IP_NAT_RANGE_PROTO_SPECIFIED; 80e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 81e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher port = atoi(colon+1); 82a3a9c0d3e3d9df70c5ea2e64ef792e194dbfbde7Yasuyuki KOZAKAI if (port <= 0 || port > 65535) 83e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 84e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port `%s' not valid\n", colon+1); 85e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 86de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte error = strchr(colon+1, ':'); 87de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte if (error) 88de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte exit_error(PARAMETER_PROBLEM, 89de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte "Invalid port:port syntax - use dash\n"); 90de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte 91e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = strchr(colon, '-'); 92e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!dash) { 93e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min.tcp.port 94e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher = range.max.tcp.port 95e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher = htons(port); 96e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else { 97e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int maxport; 98e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 99e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher maxport = atoi(dash + 1); 100a3a9c0d3e3d9df70c5ea2e64ef792e194dbfbde7Yasuyuki KOZAKAI if (maxport <= 0 || maxport > 65535) 101e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 102e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port `%s' not valid\n", dash+1); 103e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (maxport < port) 104e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* People are stupid. */ 105e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 106e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port range `%s' funky\n", colon+1); 107e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min.tcp.port = htons(port); 108e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max.tcp.port = htons(maxport); 109e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 110e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Starts with a colon? No IP info...*/ 111e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon == arg) 112e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return &(append_range(info, &range)->t); 113e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *colon = '\0'; 114e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 115e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 116e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.flags |= IP_NAT_RANGE_MAP_IPS; 117e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = strchr(arg, '-'); 118e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon && dash && dash > colon) 119e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = NULL; 120e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 121e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (dash) 122e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *dash = '\0'; 123e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 124e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ip = dotted_to_addr(arg); 125e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!ip) 126e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n", 127e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher arg); 128e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min_ip = ip->s_addr; 129e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (dash) { 130e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ip = dotted_to_addr(dash+1); 131e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!ip) 132e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n", 133e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash+1); 134e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max_ip = ip->s_addr; 135e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else 136e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max_ip = range.min_ip; 137e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 138e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return &(append_range(info, &range)->t); 139e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 140e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 141e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Function which parses command options; returns true if it 142e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ate an option */ 143e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 144e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherparse(int c, char **argv, int invert, unsigned int *flags, 145e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher const struct ipt_entry *entry, 146e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_entry_target **target) 147e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 148e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)*target; 149e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int portok; 150e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 151e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (entry->ip.proto == IPPROTO_TCP 15236d870c76621b94d51816d09eb8fd05e0fb0a0abPatrick McHardy || entry->ip.proto == IPPROTO_UDP 15336d870c76621b94d51816d09eb8fd05e0fb0a0abPatrick McHardy || entry->ip.proto == IPPROTO_ICMP) 154e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher portok = 1; 155e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else 156e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher portok = 0; 157e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 158e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher switch (c) { 159e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher case '1': 160b77f1dafb9f35752bb9685323bcacb32a0e6ddc5Harald Welte if (check_inverse(optarg, &invert, NULL, 0)) 161e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 162e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Unexpected `!' after --to-source"); 163e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 164ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_SOURCE) { 1658cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester if (!kernel_version) 1668cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester get_kernel_version(); 1678cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester if (kernel_version > LINUX_VERSION(2, 6, 10)) 1688cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester exit_error(PARAMETER_PROBLEM, 1698cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester "Multiple --to-source not supported"); 1708cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester } 171e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *target = parse_to(optarg, portok, info); 172e656e265bc67a55f6e51aa07118f96c058a97798Patrick McHardy /* WTF do we need this for?? */ 173ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_RANDOM) 174ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond info->mr.range[0].flags |= IP_NAT_RANGE_PROTO_RANDOM; 175ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond *flags = IPT_SNAT_OPT_SOURCE; 176ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond return 1; 177ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond 178ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond case '2': 179ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_SOURCE) { 180ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond info->mr.range[0].flags |= IP_NAT_RANGE_PROTO_RANDOM; 181ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond *flags |= IPT_SNAT_OPT_RANDOM; 182ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond } else 183ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond *flags |= IPT_SNAT_OPT_RANDOM; 184e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 185e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 186e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher default: 187e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 188e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 189e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 190e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 191e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Final check; must have specfied --to-source. */ 192e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void final_check(unsigned int flags) 193e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 194ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (!(flags & IPT_SNAT_OPT_SOURCE)) 195e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 196e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "You must specify --to-source"); 197e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 198e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 199e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void print_range(const struct ip_nat_range *r) 200e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 201e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->flags & IP_NAT_RANGE_MAP_IPS) { 202e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct in_addr a; 203e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 204e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher a.s_addr = r->min_ip; 205e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("%s", addr_to_dotted(&a)); 206e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->max_ip != r->min_ip) { 207e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher a.s_addr = r->max_ip; 208e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("-%s", addr_to_dotted(&a)); 209e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 210e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 211e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->flags & IP_NAT_RANGE_PROTO_SPECIFIED) { 212e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(":"); 213e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("%hu", ntohs(r->min.tcp.port)); 214e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->max.tcp.port != r->min.tcp.port) 215e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("-%hu", ntohs(r->max.tcp.port)); 216e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 217e656e265bc67a55f6e51aa07118f96c058a97798Patrick McHardy if (r->flags & IP_NAT_RANGE_PROTO_RANDOM) 218ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond printf(" random"); 219e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 220e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 221e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Prints out the targinfo. */ 222e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void 223e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherprint(const struct ipt_ip *ip, 224e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher const struct ipt_entry_target *target, 225e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int numeric) 226e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 227e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)target; 228e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i = 0; 229e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 230e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("to:"); 231e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < info->mr.rangesize; i++) { 232e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher print_range(&info->mr.range[i]); 233e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(" "); 234e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 235e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 236e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 237e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Saves the union ipt_targinfo in parsable form to stdout. */ 238e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void 239e6869a8f59d779ff4d5a0984c86d80db7078496Marc Bouchersave(const struct ipt_ip *ip, const struct ipt_entry_target *target) 240e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 241e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)target; 242e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i = 0; 243e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 244e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < info->mr.rangesize; i++) { 245e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("--to-source "); 246e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher print_range(&info->mr.range[i]); 247e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(" "); 248e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 249e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 250e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 2518caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neirastatic struct iptables_target snat = { 2528caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .next = NULL, 2538caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .name = "SNAT", 2548caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .version = IPTABLES_VERSION, 2558caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .size = IPT_ALIGN(sizeof(struct ip_nat_multi_range)), 2568caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .userspacesize = IPT_ALIGN(sizeof(struct ip_nat_multi_range)), 2578caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .help = &help, 2588caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .parse = &parse, 2598caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .final_check = &final_check, 2608caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .print = &print, 2618caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .save = &save, 2628caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .extra_opts = opts 263e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 264e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 265e6869a8f59d779ff4d5a0984c86d80db7078496Marc Bouchervoid _init(void) 266e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 267e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher register_target(&snat); 268e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 269