libipt_CLUSTERIP.c revision c340f6c3020d10975241662d449046eb4ca7a020
1/* Shared library add-on to iptables to add CLUSTERIP target support. 2 * (C) 2003 by Harald Welte <laforge@gnumonks.org> 3 * 4 * Development of this code was funded by SuSE AG, http://www.suse.com/ 5 */ 6#include <stdio.h> 7#include <string.h> 8#include <stdlib.h> 9#include <getopt.h> 10 11#if defined(__GLIBC__) && __GLIBC__ == 2 12#include <net/ethernet.h> 13#else 14#include <linux/if_ether.h> 15#endif 16 17#include <iptables.h> 18#include <linux/netfilter_ipv4/ip_tables.h> 19#include <linux/netfilter_ipv4/ipt_CLUSTERIP.h> 20 21static void 22help(void) 23{ 24 printf( 25"CLUSTERIP target v%s options:\n" 26" --new Create a new ClusterIP\n" 27" --hashmode <mode> Specify hashing mode\n" 28" sourceip\n" 29" sourceip-sourceport\n" 30" sourceip-sourceport-destport\n" 31" --clustermac <mac> Set clusterIP MAC address\n" 32" --total-nodes <num> Set number of total nodes in cluster\n" 33" --local-node <num> Set the local node number\n" 34" --hash-init\n" 35"\n", 36IPTABLES_VERSION); 37} 38 39static struct option opts[] = { 40 { "new", 0, 0, '1' }, 41 { "hashmode", 1, 0, '2' }, 42 { "clustermac", 1, 0, '3' }, 43 { "total-nodes", 1, 0, '4' }, 44 { "local-node", 1, 0, '5' }, 45 { 0 } 46}; 47 48static void 49init(struct ipt_entry_target *t, unsigned int *nfcache) 50{ 51} 52 53static void 54parse_mac(const char *mac, char *macbuf) 55{ 56 unsigned int i = 0; 57 58 if (strlen(mac) != ETH_ALEN*3-1) 59 exit_error(PARAMETER_PROBLEM, "Bad mac address `%s'", mac); 60 61 for (i = 0; i < ETH_ALEN; i++) { 62 long number; 63 char *end; 64 65 number = strtol(mac + i*3, &end, 16); 66 67 if (end == mac + i*3 + 2 68 && number >= 0 69 && number <= 255) 70 macbuf[i] = number; 71 else 72 exit_error(PARAMETER_PROBLEM, 73 "Bad mac address `%s'", mac); 74 } 75} 76 77#define PARAM_NEW 0x0001 78#define PARAM_HMODE 0x0002 79#define PARAM_MAC 0x0004 80#define PARAM_TOTALNODE 0x0008 81#define PARAM_LOCALNODE 0x0010 82 83static int 84parse(int c, char **argv, int invert, unsigned int *flags, 85 const struct ipt_entry *entry, 86 struct ipt_entry_target **target) 87{ 88 struct ipt_clusterip_tgt_info *cipinfo 89 = (struct ipt_clusterip_tgt_info *)(*target)->data; 90 91 switch (c) { 92 unsigned int num; 93 case '1': 94 cipinfo->flags |= CLUSTERIP_FLAG_NEW; 95 if (*flags & PARAM_NEW) 96 exit_error(PARAMETER_PROBLEM, "Can only specify `--new' once\n"); 97 *flags |= PARAM_NEW; 98 break; 99 case '2': 100 if (!(*flags & PARAM_NEW)) 101 exit_error(PARAMETER_PROBLEM, "Can only specify hashmode combined with `--new'\n"); 102 if (*flags & PARAM_HMODE) 103 exit_error(PARAMETER_PROBLEM, "Can only specify hashmode once\n"); 104 if (!strcmp(optarg, "sourceip")) 105 cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP; 106 else if (!strcmp(optarg, "sourceip-sourceport")) 107 cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP_SPT; 108 else if (!strcmp(optarg, "sourceip-sourceport-destport")) 109 cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP_SPT_DPT; 110 else 111 exit_error(PARAMETER_PROBLEM, "Unknown hashmode `%s'\n", 112 optarg); 113 *flags |= PARAM_HMODE; 114 break; 115 case '3': 116 if (!(*flags & PARAM_NEW)) 117 exit_error(PARAMETER_PROBLEM, "Can only specify MAC combined with `--new'\n"); 118 if (*flags & PARAM_MAC) 119 exit_error(PARAMETER_PROBLEM, "Can only specify MAC once\n"); 120 parse_mac(optarg, cipinfo->clustermac); 121 *flags |= PARAM_MAC; 122 break; 123 case '4': 124 if (!(*flags & PARAM_NEW)) 125 exit_error(PARAMETER_PROBLEM, "Can only specify node number combined with `--new'\n"); 126 if (*flags & PARAM_TOTALNODE) 127 exit_error(PARAMETER_PROBLEM, "Can only specify total node number once\n"); 128 if (string_to_number(optarg, 1, CLUSTERIP_MAX_NODES, &num) < 0) 129 exit_error(PARAMETER_PROBLEM, "Unable to parse `%s'\n", optarg); 130 cipinfo->num_total_nodes = (u_int16_t)num; 131 *flags |= PARAM_TOTALNODE; 132 break; 133 case '5': 134 if (!(*flags & PARAM_NEW)) 135 exit_error(PARAMETER_PROBLEM, "Can only specify node number combined with `--new'\n"); 136 if (*flags & PARAM_LOCALNODE) 137 exit_error(PARAMETER_PROBLEM, "Can only specify local node number once\n"); 138 if (string_to_number(optarg, 1, CLUSTERIP_MAX_NODES, &num) < 0) 139 exit_error(PARAMETER_PROBLEM, "Unable to parse `%s'\n", optarg); 140 cipinfo->num_local_nodes = 1; 141 cipinfo->local_nodes[0] = (u_int16_t)num; 142 *flags |= PARAM_LOCALNODE; 143 break; 144 default: 145 return 0; 146 } 147 148 return 1; 149} 150 151static void 152final_check(unsigned int flags) 153{ 154 if (flags == 0) 155 return; 156 157 if (flags == (PARAM_NEW|PARAM_HMODE|PARAM_MAC|PARAM_TOTALNODE|PARAM_LOCALNODE)) 158 return; 159 160 exit_error(PARAMETER_PROBLEM, "CLUSTERIP target: Invalid parameter combination\n"); 161} 162 163static char *hashmode2str(enum clusterip_hashmode mode) 164{ 165 char *retstr; 166 switch (mode) { 167 case CLUSTERIP_HASHMODE_SIP: 168 retstr = "sourceip"; 169 break; 170 case CLUSTERIP_HASHMODE_SIP_SPT: 171 retstr = "sourceip-sourceport"; 172 break; 173 case CLUSTERIP_HASHMODE_SIP_SPT_DPT: 174 retstr = "sourceip-sourceport-destport"; 175 break; 176 default: 177 retstr = "unknown-error"; 178 break; 179 } 180 return retstr; 181} 182 183static char *mac2str(u_int8_t mac[ETH_ALEN]) 184{ 185 static char buf[ETH_ALEN*3]; 186 sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X", 187 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); 188 return buf; 189} 190 191 192/* Prints out the targinfo. */ 193static void 194print(const struct ipt_ip *ip, 195 const struct ipt_entry_target *target, 196 int numeric) 197{ 198 const struct ipt_clusterip_tgt_info *cipinfo = 199 (const struct ipt_clusterip_tgt_info *)target->data; 200 201 if (!cipinfo->flags & CLUSTERIP_FLAG_NEW) { 202 printf("CLUSTERIP"); 203 return; 204 } 205 206 printf("CLUSTERIP hashmode=%s clustermac=%s total_nodes=%u local_node=%u ", 207 hashmode2str(cipinfo->hash_mode), 208 mac2str(cipinfo->clustermac), 209 cipinfo->num_total_nodes, 210 cipinfo->local_nodes[0]); 211} 212 213/* Saves the union ipt_targinfo in parsable form to stdout. */ 214static void 215save(const struct ipt_ip *ip, const struct ipt_entry_target *target) 216{ 217 /* 218 const struct ipt_connmark_target_info *markinfo = 219 (const struct ipt_connmark_target_info *)target->data; 220 221 switch (markinfo->mode) { 222 case IPT_CONNMARK_SET: 223 printf("--set-mark 0x%lx ", markinfo->mark); 224 break; 225 case IPT_CONNMARK_SAVE: 226 printf("--save-mark "); 227 break; 228 case IPT_CONNMARK_RESTORE: 229 printf("--restore-mark "); 230 break; 231 default: 232 printf("ERROR: UNKNOWN CONNMARK MODE "); 233 break; 234 } 235 */ 236} 237 238static 239struct iptables_target clusterip 240= { NULL, 241 "CLUSTERIP", 242 IPTABLES_VERSION, 243 IPT_ALIGN(sizeof(struct ipt_clusterip_tgt_info)), 244 IPT_ALIGN(sizeof(struct ipt_clusterip_tgt_info)), 245 &help, 246 &init, 247 &parse, 248 &final_check, 249 &print, 250 &save, 251 opts 252}; 253 254void _init(void) 255{ 256 register_target(&clusterip); 257} 258