Harald Welte | c340f6c | 2003-11-11 18:41:36 +0000 | [diff] [blame^] | 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 | |
| 21 | static void |
| 22 | help(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", |
| 36 | IPTABLES_VERSION); |
| 37 | } |
| 38 | |
| 39 | static 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 | |
| 48 | static void |
| 49 | init(struct ipt_entry_target *t, unsigned int *nfcache) |
| 50 | { |
| 51 | } |
| 52 | |
| 53 | static void |
| 54 | parse_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 | |
| 83 | static int |
| 84 | parse(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 | |
| 151 | static void |
| 152 | final_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 | |
| 163 | static 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 | |
| 183 | static 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. */ |
| 193 | static void |
| 194 | print(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. */ |
| 214 | static void |
| 215 | save(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 | |
| 238 | static |
| 239 | struct 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 | |
| 254 | void _init(void) |
| 255 | { |
| 256 | register_target(&clusterip); |
| 257 | } |