libipt_SNAT.c revision 9ee386a1b6d7704b259460152c959ab0e79e02aa
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{ 18193df8ee3507f0c02762c88a16916c4ea950bd99Yasuyuki KOZAKAI struct xt_entry_target t; 19e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ip_nat_multi_range mr; 20e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 21e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 22e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Function which prints out usage message. */ 231d5b63d12984d12c8d87242179855e17657be16dJan Engelhardtstatic void SNAT_help(void) 24e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 25e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf( 26e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher"SNAT v%s options:\n" 27ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy" --to-source <ipaddr>[-<ipaddr>][:port-port]\n" 28e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher" Address to map source to.\n" 29ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy"[--random]\n" 30ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy"\n", 3180fe35d6339b53a12ddaec41885613e4e37ed031Harald WelteIPTABLES_VERSION); 32e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 33e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 341d5b63d12984d12c8d87242179855e17657be16dJan Engelhardtstatic const struct option SNAT_opts[] = { 35500f483fff529dcd88ec96b9d5054be6cd6363a0Patrick McHardy { "to-source", 1, NULL, '1' }, 36500f483fff529dcd88ec96b9d5054be6cd6363a0Patrick McHardy { "random", 0, NULL, '2' }, 379ee386a1b6d7704b259460152c959ab0e79e02aaMax Kellermann { .name = NULL } 38e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 39e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 40e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic struct ipt_natinfo * 41e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherappend_range(struct ipt_natinfo *info, const struct ip_nat_range *range) 42e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 43e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int size; 44e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 45e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* One rangesize already in struct ipt_natinfo */ 46e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher size = IPT_ALIGN(sizeof(*info) + info->mr.rangesize * sizeof(*range)); 47e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 48e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info = realloc(info, size); 49e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!info) 50e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(OTHER_PROBLEM, "Out of memory\n"); 51e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 52228e98dd6303af11925235af4cf3c3ec450f3f41Rusty Russell info->t.u.target_size = size; 53e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info->mr.range[info->mr.rangesize] = *range; 54e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher info->mr.rangesize++; 55e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 56e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return info; 57e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 58e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 59e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Ranges expected in network order. */ 60193df8ee3507f0c02762c88a16916c4ea950bd99Yasuyuki KOZAKAIstatic struct xt_entry_target * 61e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherparse_to(char *arg, int portok, struct ipt_natinfo *info) 62e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 63e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ip_nat_range range; 64de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte char *colon, *dash, *error; 65bd9438420d92c41a5cf20a53b7a18d3ddea4216dJan Engelhardt const struct in_addr *ip; 66e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 67e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher memset(&range, 0, sizeof(range)); 68e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher colon = strchr(arg, ':'); 69e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 70e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon) { 71e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int port; 72e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 73e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!portok) 74e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 75e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Need TCP or UDP with port specification"); 76e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 77e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.flags |= IP_NAT_RANGE_PROTO_SPECIFIED; 78e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 79e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher port = atoi(colon+1); 80a3a9c0d3e3d9df70c5ea2e64ef792e194dbfbde7Yasuyuki KOZAKAI if (port <= 0 || port > 65535) 81e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 82e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port `%s' not valid\n", colon+1); 83e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 84de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte error = strchr(colon+1, ':'); 85de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte if (error) 86de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte exit_error(PARAMETER_PROBLEM, 87de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte "Invalid port:port syntax - use dash\n"); 88de5ba5db3fd28dbb4cf3f3ec23b888ce0e1e1e4dHarald Welte 89e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = strchr(colon, '-'); 90e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!dash) { 91e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min.tcp.port 92e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher = range.max.tcp.port 93e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher = htons(port); 94e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else { 95e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int maxport; 96e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 97e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher maxport = atoi(dash + 1); 98a3a9c0d3e3d9df70c5ea2e64ef792e194dbfbde7Yasuyuki KOZAKAI if (maxport <= 0 || maxport > 65535) 99e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 100e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port `%s' not valid\n", dash+1); 101e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (maxport < port) 102e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* People are stupid. */ 103e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 104e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Port range `%s' funky\n", colon+1); 105e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min.tcp.port = htons(port); 106e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max.tcp.port = htons(maxport); 107e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 108e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher /* Starts with a colon? No IP info...*/ 109e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon == arg) 110e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return &(append_range(info, &range)->t); 111e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *colon = '\0'; 112e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 113e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 114e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.flags |= IP_NAT_RANGE_MAP_IPS; 115e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = strchr(arg, '-'); 116e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (colon && dash && dash > colon) 117e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash = NULL; 118e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 119e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (dash) 120e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *dash = '\0'; 121e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 122bd9438420d92c41a5cf20a53b7a18d3ddea4216dJan Engelhardt ip = numeric_to_ipaddr(arg); 123e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!ip) 124e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n", 125e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher arg); 126e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.min_ip = ip->s_addr; 127e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (dash) { 128bd9438420d92c41a5cf20a53b7a18d3ddea4216dJan Engelhardt ip = numeric_to_ipaddr(dash+1); 129e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (!ip) 130e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n", 131e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher dash+1); 132e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max_ip = ip->s_addr; 133e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } else 134e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher range.max_ip = range.min_ip; 135e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 136e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return &(append_range(info, &range)->t); 137e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 138e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 139e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Function which parses command options; returns true if it 140e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher ate an option */ 1411d5b63d12984d12c8d87242179855e17657be16dJan Engelhardtstatic int SNAT_parse(int c, char **argv, int invert, unsigned int *flags, 1421d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt const void *e, struct xt_entry_target **target) 143e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 144ac8b2718daf8a79a59b181f6e62495f307ae86b9Yasuyuki KOZAKAI const struct ipt_entry *entry = e; 145e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)*target; 146e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher int portok; 147e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 148e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (entry->ip.proto == IPPROTO_TCP 14936d870c76621b94d51816d09eb8fd05e0fb0a0abPatrick McHardy || entry->ip.proto == IPPROTO_UDP 15036d870c76621b94d51816d09eb8fd05e0fb0a0abPatrick McHardy || entry->ip.proto == IPPROTO_ICMP) 151e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher portok = 1; 152e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher else 153e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher portok = 0; 154e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 155e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher switch (c) { 156e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher case '1': 157b77f1dafb9f35752bb9685323bcacb32a0e6ddc5Harald Welte if (check_inverse(optarg, &invert, NULL, 0)) 158e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 159e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "Unexpected `!' after --to-source"); 160e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 161ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_SOURCE) { 1628cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester if (!kernel_version) 1638cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester get_kernel_version(); 1648cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester if (kernel_version > LINUX_VERSION(2, 6, 10)) 1658cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester exit_error(PARAMETER_PROBLEM, 1668cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester "Multiple --to-source not supported"); 1678cf65913bb6353bf0e92eab0669d1c4c53b43623Phil Oester } 168e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher *target = parse_to(optarg, portok, info); 169e656e265bc67a55f6e51aa07118f96c058a97798Patrick McHardy /* WTF do we need this for?? */ 170ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_RANDOM) 171ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy info->mr.range[0].flags |= IP_NAT_RANGE_PROTO_RANDOM; 172ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy *flags |= IPT_SNAT_OPT_SOURCE; 173ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond return 1; 174ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond 175ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond case '2': 176ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (*flags & IPT_SNAT_OPT_SOURCE) { 177ef399a3033aa860ea1653b9c4306c0e78777e981Patrick McHardy info->mr.range[0].flags |= IP_NAT_RANGE_PROTO_RANDOM; 178ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond *flags |= IPT_SNAT_OPT_RANDOM; 179ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond } else 180ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond *flags |= IPT_SNAT_OPT_RANDOM; 181e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 1; 182e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 183e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher default: 184e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher return 0; 185e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 186e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 187e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 188e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Final check; must have specfied --to-source. */ 1891d5b63d12984d12c8d87242179855e17657be16dJan Engelhardtstatic void SNAT_check(unsigned int flags) 190e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 191ae4b0b3aa70c67f2eff303a3e75834e45c3794a7Eric Leblond if (!(flags & IPT_SNAT_OPT_SOURCE)) 192e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher exit_error(PARAMETER_PROBLEM, 193e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher "You must specify --to-source"); 194e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 195e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 196e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucherstatic void print_range(const struct ip_nat_range *r) 197e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 198e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->flags & IP_NAT_RANGE_MAP_IPS) { 199e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct in_addr a; 200e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 201e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher a.s_addr = r->min_ip; 20208b1616e068166e016b3ee7110db10ae5d853422Jan Engelhardt printf("%s", ipaddr_to_numeric(&a)); 203e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->max_ip != r->min_ip) { 204e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher a.s_addr = r->max_ip; 20508b1616e068166e016b3ee7110db10ae5d853422Jan Engelhardt printf("-%s", ipaddr_to_numeric(&a)); 206e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 207e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 208e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->flags & IP_NAT_RANGE_PROTO_SPECIFIED) { 209e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(":"); 210e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("%hu", ntohs(r->min.tcp.port)); 211e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher if (r->max.tcp.port != r->min.tcp.port) 212e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("-%hu", ntohs(r->max.tcp.port)); 213e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 214e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 215e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 216e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Prints out the targinfo. */ 2171d5b63d12984d12c8d87242179855e17657be16dJan Engelhardtstatic void SNAT_print(const void *ip, const struct xt_entry_target *target, 2181d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt int numeric) 219e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 220e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)target; 221e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i = 0; 222e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 223e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("to:"); 224e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < info->mr.rangesize; i++) { 225e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher print_range(&info->mr.range[i]); 226e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(" "); 2279c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy if (info->mr.range[i].flags & IP_NAT_RANGE_PROTO_RANDOM) 2289c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy printf("random "); 229e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 230e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 231e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 232e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher/* Saves the union ipt_targinfo in parsable form to stdout. */ 2331d5b63d12984d12c8d87242179855e17657be16dJan Engelhardtstatic void SNAT_save(const void *ip, const struct xt_entry_target *target) 234e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 235e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher struct ipt_natinfo *info = (void *)target; 236e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher unsigned int i = 0; 237e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 238e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher for (i = 0; i < info->mr.rangesize; i++) { 239e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf("--to-source "); 240e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher print_range(&info->mr.range[i]); 241e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher printf(" "); 2429c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy if (info->mr.range[i].flags & IP_NAT_RANGE_PROTO_RANDOM) 2439c67defe98f04f72f19dfd09c8030e1de4b8bf0fPatrick McHardy printf("--random "); 244e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher } 245e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 246e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 2471d5b63d12984d12c8d87242179855e17657be16dJan Engelhardtstatic struct iptables_target snat_target = { 2488caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .name = "SNAT", 2498caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .version = IPTABLES_VERSION, 2508caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .size = IPT_ALIGN(sizeof(struct ip_nat_multi_range)), 2518caee8b9e34fed4562fcff553197c161fc9d9979Pablo Neira .userspacesize = IPT_ALIGN(sizeof(struct ip_nat_multi_range)), 2521d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt .help = SNAT_help, 2531d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt .parse = SNAT_parse, 2541d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt .final_check = SNAT_check, 2551d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt .print = SNAT_print, 2561d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt .save = SNAT_save, 2571d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt .extra_opts = SNAT_opts, 258e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher}; 259e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher 260e6869a8f59d779ff4d5a0984c86d80db7078496Marc Bouchervoid _init(void) 261e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher{ 2621d5b63d12984d12c8d87242179855e17657be16dJan Engelhardt register_target(&snat_target); 263e6869a8f59d779ff4d5a0984c86d80db7078496Marc Boucher} 264