libipt_SNAT.c revision ef399a3033aa860ea1653b9c4306c0e78777e981
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" 28ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy" --to-source <ipaddr>[-<ipaddr>][:port-port]\n" 29e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher" Address to map source to.\n" 30ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy"[--random]\n" 31ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy"\n", 3280fe35d6339b53a12ddaec41885613e4e37ed031Harald WelteIPTABLES_VERSION); 33e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 34e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 35e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic struct option opts[] = { 36e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher { "to-source", 1, 0, '1' }, 37ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond { "random", 0, 0, '2' }, 38e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher { 0 } 39e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 40e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 41e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic struct ipt_natinfo * 42e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherappend_range(struct ipt_natinfo *info, const struct ip_nat_range *range) 43e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 44e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int size; 45e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 46e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* One rangesize already in struct ipt_natinfo */ 47e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher size = IPT_ALIGN(sizeof(*info) + info->mr.rangesize * sizeof(*range)); 48e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 49e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info = realloc(info, size); 50e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!info) 51e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(OTHER_PROBLEM, "Out of memory\n"); 52e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 53228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell info->t.u.target_size = size; 54e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info->mr.range[info->mr.rangesize] = *range; 55e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info->mr.rangesize++; 56e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 57e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return info; 58e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 59e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 60e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Ranges expected in network order. */ 61e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic struct ipt_entry_target * 62e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherparse_to(char *arg, int portok, struct ipt_natinfo *info) 63e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 64e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ip_nat_range range; 65de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte char *colon, *dash, *error; 66e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct in_addr *ip; 67e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 68e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memset(&range, 0, sizeof(range)); 69e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher colon = strchr(arg, ':'); 70e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 71e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon) { 72e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int port; 73e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 74e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!portok) 75e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 76e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Need TCP or UDP with port specification"); 77e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 78e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.flags |= IP_NAT_RANGE_PROTO_SPECIFIED; 79e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 80e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher port = atoi(colon+1); 81a3a9c0d3e3d9df70c5ea2e64ef792e194dbfbde7Yasuyuki KOZAKAI if (port <= 0 || port > 65535) 82e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 83e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port `%s' not valid\n", colon+1); 84e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 85de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte error = strchr(colon+1, ':'); 86de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte if (error) 87de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte exit_error(PARAMETER_PROBLEM, 88de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte "Invalid port:port syntax - use dash\n"); 89de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte 90e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = strchr(colon, '-'); 91e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!dash) { 92e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min.tcp.port 93e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher = range.max.tcp.port 94e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher = htons(port); 95e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else { 96e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int maxport; 97e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 98e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher maxport = atoi(dash + 1); 99a3a9c0d3e3d9df70c5ea2e64ef792e194dbfbde7Yasuyuki KOZAKAI if (maxport <= 0 || maxport > 65535) 100e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 101e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port `%s' not valid\n", dash+1); 102e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (maxport < port) 103e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* People are stupid. */ 104e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 105e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port range `%s' funky\n", colon+1); 106e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min.tcp.port = htons(port); 107e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max.tcp.port = htons(maxport); 108e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 109e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Starts with a colon? No IP info...*/ 110e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon == arg) 111e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return &(append_range(info, &range)->t); 112e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *colon = '\0'; 113e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 114e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 115e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.flags |= IP_NAT_RANGE_MAP_IPS; 116e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = strchr(arg, '-'); 117e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon && dash && dash > colon) 118e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = NULL; 119e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 120e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (dash) 121e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *dash = '\0'; 122e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 123e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ip = dotted_to_addr(arg); 124e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!ip) 125e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n", 126e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher arg); 127e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min_ip = ip->s_addr; 128e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (dash) { 129e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ip = dotted_to_addr(dash+1); 130e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!ip) 131e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n", 132e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash+1); 133e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max_ip = ip->s_addr; 134e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else 135e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max_ip = range.min_ip; 136e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 137e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return &(append_range(info, &range)->t); 138e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 139e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 140e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Function which parses command options; returns true if it 141e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ate an option */ 142e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic int 143e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherparse(int c, char **argv, int invert, unsigned int *flags, 144e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher const struct ipt_entry *entry, 145e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_entry_target **target) 146e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 147e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)*target; 148e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int portok; 149e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 150e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (entry->ip.proto == IPPROTO_TCP 15136d870c76621b94d51816d09eb8fd05e0fb0a0abPatrick McHardy || entry->ip.proto == IPPROTO_UDP 15236d870c76621b94d51816d09eb8fd05e0fb0a0abPatrick McHardy || entry->ip.proto == IPPROTO_ICMP) 153e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher portok = 1; 154e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else 155e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher portok = 0; 156e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 157e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher switch (c) { 158e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher case '1': 159b77f1dafb9f35752bb9685323bcacb32a0e6ddc5Harald Welte if (check_inverse(optarg, &invert, NULL, 0)) 160e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 161e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Unexpected `!' after --to-source"); 162e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 163ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_SOURCE) { 1648cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester if (!kernel_version) 1658cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester get_kernel_version(); 1668cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester if (kernel_version > LINUX_VERSION(2, 6, 10)) 1678cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester exit_error(PARAMETER_PROBLEM, 1688cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester "Multiple --to-source not supported"); 1698cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester } 170e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *target = parse_to(optarg, portok, info); 171e656e265bc67a55f6e51aa07118f96c058a97798Patrick McHardy /* WTF do we need this for?? */ 172ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_RANDOM) 173ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy info->mr.range[0].flags |= IP_NAT_RANGE_PROTO_RANDOM; 174ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy *flags |= IPT_SNAT_OPT_SOURCE; 175ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond return 1; 176ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond 177ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond case '2': 178ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_SOURCE) { 179ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy info->mr.range[0].flags |= IP_NAT_RANGE_PROTO_RANDOM; 180ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond *flags |= IPT_SNAT_OPT_RANDOM; 181ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond } else 182ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond *flags |= IPT_SNAT_OPT_RANDOM; 183e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 184e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 185e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher default: 186e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 187e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 188e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 189e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 190e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Final check; must have specfied --to-source. */ 191e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void final_check(unsigned int flags) 192e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 193ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (!(flags & IPT_SNAT_OPT_SOURCE)) 194e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 195e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "You must specify --to-source"); 196e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 197e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 198e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void print_range(const struct ip_nat_range *r) 199e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 200e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->flags & IP_NAT_RANGE_MAP_IPS) { 201e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct in_addr a; 202e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 203e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher a.s_addr = r->min_ip; 204e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("%s", addr_to_dotted(&a)); 205e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->max_ip != r->min_ip) { 206e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher a.s_addr = r->max_ip; 207e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("-%s", addr_to_dotted(&a)); 208e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 209e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 210e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->flags & IP_NAT_RANGE_PROTO_SPECIFIED) { 211e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(":"); 212e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("%hu", ntohs(r->min.tcp.port)); 213e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->max.tcp.port != r->min.tcp.port) 214e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("-%hu", ntohs(r->max.tcp.port)); 215e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 216e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 217e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 218e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Prints out the targinfo. */ 219e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void 220e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherprint(const struct ipt_ip *ip, 221e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher const struct ipt_entry_target *target, 222e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int numeric) 223e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 224e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)target; 225e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i = 0; 226e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 227e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("to:"); 228e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < info->mr.rangesize; i++) { 229e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher print_range(&info->mr.range[i]); 230e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(" "); 2319c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy if (info->mr.range[i].flags & IP_NAT_RANGE_PROTO_RANDOM) 2329c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy printf("random "); 233e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 234e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 235e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 236e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Saves the union ipt_targinfo in parsable form to stdout. */ 237e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void 238e6869a8f59d779ff4d5a0984c86d80db7078496Marc Bouchersave(const struct ipt_ip *ip, const struct ipt_entry_target *target) 239e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 240e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)target; 241e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i = 0; 242e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 243e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < info->mr.rangesize; i++) { 244e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("--to-source "); 245e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher print_range(&info->mr.range[i]); 246e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(" "); 2479c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy if (info->mr.range[i].flags & IP_NAT_RANGE_PROTO_RANDOM) 2489c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy printf("--random "); 249e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 250e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 251e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 2528caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neirastatic struct iptables_target snat = { 2538caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .next = NULL, 2548caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .name = "SNAT", 2558caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .version = IPTABLES_VERSION, 2568caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .size = IPT_ALIGN(sizeof(struct ip_nat_multi_range)), 2578caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .userspacesize = IPT_ALIGN(sizeof(struct ip_nat_multi_range)), 2588caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .help = &help, 2598caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .parse = &parse, 2608caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .final_check = &final_check, 2618caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .print = &print, 2628caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .save = &save, 2638caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .extra_opts = opts 264e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 265e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 266e6869a8f59d779ff4d5a0984c86d80db7078496Marc Bouchervoid _init(void) 267e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 268e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher register_target(&snat); 269e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 270