Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPVS An implementation of the IP virtual server support for the |
| 3 | * LINUX operating system. IPVS is now implemented as a module |
| 4 | * over the NetFilter framework. IPVS can be used to build a |
| 5 | * high-performance and highly available server based on a |
| 6 | * cluster of servers. |
| 7 | * |
| 8 | * Version: $Id: ip_vs_ctl.c,v 1.36 2003/06/08 09:31:19 wensong Exp $ |
| 9 | * |
| 10 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 11 | * Peter Kese <peter.kese@ijs.si> |
| 12 | * Julian Anastasov <ja@ssi.bg> |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or |
| 15 | * modify it under the terms of the GNU General Public License |
| 16 | * as published by the Free Software Foundation; either version |
| 17 | * 2 of the License, or (at your option) any later version. |
| 18 | * |
| 19 | * Changes: |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/sysctl.h> |
| 28 | #include <linux/proc_fs.h> |
| 29 | #include <linux/workqueue.h> |
| 30 | #include <linux/swap.h> |
| 31 | #include <linux/proc_fs.h> |
| 32 | #include <linux/seq_file.h> |
| 33 | |
| 34 | #include <linux/netfilter.h> |
| 35 | #include <linux/netfilter_ipv4.h> |
| 36 | |
| 37 | #include <net/ip.h> |
| 38 | #include <net/sock.h> |
| 39 | |
| 40 | #include <asm/uaccess.h> |
| 41 | |
| 42 | #include <net/ip_vs.h> |
| 43 | |
| 44 | /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */ |
| 45 | static DECLARE_MUTEX(__ip_vs_mutex); |
| 46 | |
| 47 | /* lock for service table */ |
| 48 | static DEFINE_RWLOCK(__ip_vs_svc_lock); |
| 49 | |
| 50 | /* lock for table with the real services */ |
| 51 | static DEFINE_RWLOCK(__ip_vs_rs_lock); |
| 52 | |
| 53 | /* lock for state and timeout tables */ |
| 54 | static DEFINE_RWLOCK(__ip_vs_securetcp_lock); |
| 55 | |
| 56 | /* lock for drop entry handling */ |
| 57 | static DEFINE_SPINLOCK(__ip_vs_dropentry_lock); |
| 58 | |
| 59 | /* lock for drop packet handling */ |
| 60 | static DEFINE_SPINLOCK(__ip_vs_droppacket_lock); |
| 61 | |
| 62 | /* 1/rate drop and drop-entry variables */ |
| 63 | int ip_vs_drop_rate = 0; |
| 64 | int ip_vs_drop_counter = 0; |
| 65 | static atomic_t ip_vs_dropentry = ATOMIC_INIT(0); |
| 66 | |
| 67 | /* number of virtual services */ |
| 68 | static int ip_vs_num_services = 0; |
| 69 | |
| 70 | /* sysctl variables */ |
| 71 | static int sysctl_ip_vs_drop_entry = 0; |
| 72 | static int sysctl_ip_vs_drop_packet = 0; |
| 73 | static int sysctl_ip_vs_secure_tcp = 0; |
| 74 | static int sysctl_ip_vs_amemthresh = 1024; |
| 75 | static int sysctl_ip_vs_am_droprate = 10; |
| 76 | int sysctl_ip_vs_cache_bypass = 0; |
| 77 | int sysctl_ip_vs_expire_nodest_conn = 0; |
| 78 | int sysctl_ip_vs_expire_quiescent_template = 0; |
| 79 | int sysctl_ip_vs_sync_threshold[2] = { 3, 50 }; |
| 80 | int sysctl_ip_vs_nat_icmp_send = 0; |
| 81 | |
| 82 | |
| 83 | #ifdef CONFIG_IP_VS_DEBUG |
| 84 | static int sysctl_ip_vs_debug_level = 0; |
| 85 | |
| 86 | int ip_vs_get_debug_level(void) |
| 87 | { |
| 88 | return sysctl_ip_vs_debug_level; |
| 89 | } |
| 90 | #endif |
| 91 | |
| 92 | /* |
Julian Anastasov | af9debd | 2005-07-11 20:59:57 -0700 | [diff] [blame] | 93 | * update_defense_level is called from keventd and from sysctl, |
| 94 | * so it needs to protect itself from softirqs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | */ |
| 96 | static void update_defense_level(void) |
| 97 | { |
| 98 | struct sysinfo i; |
| 99 | static int old_secure_tcp = 0; |
| 100 | int availmem; |
| 101 | int nomem; |
| 102 | int to_change = -1; |
| 103 | |
| 104 | /* we only count free and buffered memory (in pages) */ |
| 105 | si_meminfo(&i); |
| 106 | availmem = i.freeram + i.bufferram; |
| 107 | /* however in linux 2.5 the i.bufferram is total page cache size, |
| 108 | we need adjust it */ |
| 109 | /* si_swapinfo(&i); */ |
| 110 | /* availmem = availmem - (i.totalswap - i.freeswap); */ |
| 111 | |
| 112 | nomem = (availmem < sysctl_ip_vs_amemthresh); |
| 113 | |
Julian Anastasov | af9debd | 2005-07-11 20:59:57 -0700 | [diff] [blame] | 114 | local_bh_disable(); |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | /* drop_entry */ |
| 117 | spin_lock(&__ip_vs_dropentry_lock); |
| 118 | switch (sysctl_ip_vs_drop_entry) { |
| 119 | case 0: |
| 120 | atomic_set(&ip_vs_dropentry, 0); |
| 121 | break; |
| 122 | case 1: |
| 123 | if (nomem) { |
| 124 | atomic_set(&ip_vs_dropentry, 1); |
| 125 | sysctl_ip_vs_drop_entry = 2; |
| 126 | } else { |
| 127 | atomic_set(&ip_vs_dropentry, 0); |
| 128 | } |
| 129 | break; |
| 130 | case 2: |
| 131 | if (nomem) { |
| 132 | atomic_set(&ip_vs_dropentry, 1); |
| 133 | } else { |
| 134 | atomic_set(&ip_vs_dropentry, 0); |
| 135 | sysctl_ip_vs_drop_entry = 1; |
| 136 | }; |
| 137 | break; |
| 138 | case 3: |
| 139 | atomic_set(&ip_vs_dropentry, 1); |
| 140 | break; |
| 141 | } |
| 142 | spin_unlock(&__ip_vs_dropentry_lock); |
| 143 | |
| 144 | /* drop_packet */ |
| 145 | spin_lock(&__ip_vs_droppacket_lock); |
| 146 | switch (sysctl_ip_vs_drop_packet) { |
| 147 | case 0: |
| 148 | ip_vs_drop_rate = 0; |
| 149 | break; |
| 150 | case 1: |
| 151 | if (nomem) { |
| 152 | ip_vs_drop_rate = ip_vs_drop_counter |
| 153 | = sysctl_ip_vs_amemthresh / |
| 154 | (sysctl_ip_vs_amemthresh-availmem); |
| 155 | sysctl_ip_vs_drop_packet = 2; |
| 156 | } else { |
| 157 | ip_vs_drop_rate = 0; |
| 158 | } |
| 159 | break; |
| 160 | case 2: |
| 161 | if (nomem) { |
| 162 | ip_vs_drop_rate = ip_vs_drop_counter |
| 163 | = sysctl_ip_vs_amemthresh / |
| 164 | (sysctl_ip_vs_amemthresh-availmem); |
| 165 | } else { |
| 166 | ip_vs_drop_rate = 0; |
| 167 | sysctl_ip_vs_drop_packet = 1; |
| 168 | } |
| 169 | break; |
| 170 | case 3: |
| 171 | ip_vs_drop_rate = sysctl_ip_vs_am_droprate; |
| 172 | break; |
| 173 | } |
| 174 | spin_unlock(&__ip_vs_droppacket_lock); |
| 175 | |
| 176 | /* secure_tcp */ |
| 177 | write_lock(&__ip_vs_securetcp_lock); |
| 178 | switch (sysctl_ip_vs_secure_tcp) { |
| 179 | case 0: |
| 180 | if (old_secure_tcp >= 2) |
| 181 | to_change = 0; |
| 182 | break; |
| 183 | case 1: |
| 184 | if (nomem) { |
| 185 | if (old_secure_tcp < 2) |
| 186 | to_change = 1; |
| 187 | sysctl_ip_vs_secure_tcp = 2; |
| 188 | } else { |
| 189 | if (old_secure_tcp >= 2) |
| 190 | to_change = 0; |
| 191 | } |
| 192 | break; |
| 193 | case 2: |
| 194 | if (nomem) { |
| 195 | if (old_secure_tcp < 2) |
| 196 | to_change = 1; |
| 197 | } else { |
| 198 | if (old_secure_tcp >= 2) |
| 199 | to_change = 0; |
| 200 | sysctl_ip_vs_secure_tcp = 1; |
| 201 | } |
| 202 | break; |
| 203 | case 3: |
| 204 | if (old_secure_tcp < 2) |
| 205 | to_change = 1; |
| 206 | break; |
| 207 | } |
| 208 | old_secure_tcp = sysctl_ip_vs_secure_tcp; |
| 209 | if (to_change >= 0) |
| 210 | ip_vs_protocol_timeout_change(sysctl_ip_vs_secure_tcp>1); |
| 211 | write_unlock(&__ip_vs_securetcp_lock); |
Julian Anastasov | af9debd | 2005-07-11 20:59:57 -0700 | [diff] [blame] | 212 | |
| 213 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | |
| 217 | /* |
| 218 | * Timer for checking the defense |
| 219 | */ |
| 220 | #define DEFENSE_TIMER_PERIOD 1*HZ |
| 221 | static void defense_work_handler(void *data); |
| 222 | static DECLARE_WORK(defense_work, defense_work_handler, NULL); |
| 223 | |
| 224 | static void defense_work_handler(void *data) |
| 225 | { |
| 226 | update_defense_level(); |
| 227 | if (atomic_read(&ip_vs_dropentry)) |
| 228 | ip_vs_random_dropentry(); |
| 229 | |
| 230 | schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD); |
| 231 | } |
| 232 | |
| 233 | int |
| 234 | ip_vs_use_count_inc(void) |
| 235 | { |
| 236 | return try_module_get(THIS_MODULE); |
| 237 | } |
| 238 | |
| 239 | void |
| 240 | ip_vs_use_count_dec(void) |
| 241 | { |
| 242 | module_put(THIS_MODULE); |
| 243 | } |
| 244 | |
| 245 | |
| 246 | /* |
| 247 | * Hash table: for virtual service lookups |
| 248 | */ |
| 249 | #define IP_VS_SVC_TAB_BITS 8 |
| 250 | #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS) |
| 251 | #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1) |
| 252 | |
| 253 | /* the service table hashed by <protocol, addr, port> */ |
| 254 | static struct list_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE]; |
| 255 | /* the service table hashed by fwmark */ |
| 256 | static struct list_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE]; |
| 257 | |
| 258 | /* |
| 259 | * Hash table: for real service lookups |
| 260 | */ |
| 261 | #define IP_VS_RTAB_BITS 4 |
| 262 | #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) |
| 263 | #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) |
| 264 | |
| 265 | static struct list_head ip_vs_rtable[IP_VS_RTAB_SIZE]; |
| 266 | |
| 267 | /* |
| 268 | * Trash for destinations |
| 269 | */ |
| 270 | static LIST_HEAD(ip_vs_dest_trash); |
| 271 | |
| 272 | /* |
| 273 | * FTP & NULL virtual service counters |
| 274 | */ |
| 275 | static atomic_t ip_vs_ftpsvc_counter = ATOMIC_INIT(0); |
| 276 | static atomic_t ip_vs_nullsvc_counter = ATOMIC_INIT(0); |
| 277 | |
| 278 | |
| 279 | /* |
| 280 | * Returns hash value for virtual service |
| 281 | */ |
| 282 | static __inline__ unsigned |
| 283 | ip_vs_svc_hashkey(unsigned proto, __u32 addr, __u16 port) |
| 284 | { |
| 285 | register unsigned porth = ntohs(port); |
| 286 | |
| 287 | return (proto^ntohl(addr)^(porth>>IP_VS_SVC_TAB_BITS)^porth) |
| 288 | & IP_VS_SVC_TAB_MASK; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Returns hash value of fwmark for virtual service lookup |
| 293 | */ |
| 294 | static __inline__ unsigned ip_vs_svc_fwm_hashkey(__u32 fwmark) |
| 295 | { |
| 296 | return fwmark & IP_VS_SVC_TAB_MASK; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Hashes a service in the ip_vs_svc_table by <proto,addr,port> |
| 301 | * or in the ip_vs_svc_fwm_table by fwmark. |
| 302 | * Should be called with locked tables. |
| 303 | */ |
| 304 | static int ip_vs_svc_hash(struct ip_vs_service *svc) |
| 305 | { |
| 306 | unsigned hash; |
| 307 | |
| 308 | if (svc->flags & IP_VS_SVC_F_HASHED) { |
| 309 | IP_VS_ERR("ip_vs_svc_hash(): request for already hashed, " |
| 310 | "called from %p\n", __builtin_return_address(0)); |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | if (svc->fwmark == 0) { |
| 315 | /* |
| 316 | * Hash it by <protocol,addr,port> in ip_vs_svc_table |
| 317 | */ |
| 318 | hash = ip_vs_svc_hashkey(svc->protocol, svc->addr, svc->port); |
| 319 | list_add(&svc->s_list, &ip_vs_svc_table[hash]); |
| 320 | } else { |
| 321 | /* |
| 322 | * Hash it by fwmark in ip_vs_svc_fwm_table |
| 323 | */ |
| 324 | hash = ip_vs_svc_fwm_hashkey(svc->fwmark); |
| 325 | list_add(&svc->f_list, &ip_vs_svc_fwm_table[hash]); |
| 326 | } |
| 327 | |
| 328 | svc->flags |= IP_VS_SVC_F_HASHED; |
| 329 | /* increase its refcnt because it is referenced by the svc table */ |
| 330 | atomic_inc(&svc->refcnt); |
| 331 | return 1; |
| 332 | } |
| 333 | |
| 334 | |
| 335 | /* |
| 336 | * Unhashes a service from ip_vs_svc_table/ip_vs_svc_fwm_table. |
| 337 | * Should be called with locked tables. |
| 338 | */ |
| 339 | static int ip_vs_svc_unhash(struct ip_vs_service *svc) |
| 340 | { |
| 341 | if (!(svc->flags & IP_VS_SVC_F_HASHED)) { |
| 342 | IP_VS_ERR("ip_vs_svc_unhash(): request for unhash flagged, " |
| 343 | "called from %p\n", __builtin_return_address(0)); |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | if (svc->fwmark == 0) { |
| 348 | /* Remove it from the ip_vs_svc_table table */ |
| 349 | list_del(&svc->s_list); |
| 350 | } else { |
| 351 | /* Remove it from the ip_vs_svc_fwm_table table */ |
| 352 | list_del(&svc->f_list); |
| 353 | } |
| 354 | |
| 355 | svc->flags &= ~IP_VS_SVC_F_HASHED; |
| 356 | atomic_dec(&svc->refcnt); |
| 357 | return 1; |
| 358 | } |
| 359 | |
| 360 | |
| 361 | /* |
| 362 | * Get service by {proto,addr,port} in the service table. |
| 363 | */ |
| 364 | static __inline__ struct ip_vs_service * |
| 365 | __ip_vs_service_get(__u16 protocol, __u32 vaddr, __u16 vport) |
| 366 | { |
| 367 | unsigned hash; |
| 368 | struct ip_vs_service *svc; |
| 369 | |
| 370 | /* Check for "full" addressed entries */ |
| 371 | hash = ip_vs_svc_hashkey(protocol, vaddr, vport); |
| 372 | |
| 373 | list_for_each_entry(svc, &ip_vs_svc_table[hash], s_list){ |
| 374 | if ((svc->addr == vaddr) |
| 375 | && (svc->port == vport) |
| 376 | && (svc->protocol == protocol)) { |
| 377 | /* HIT */ |
| 378 | atomic_inc(&svc->usecnt); |
| 379 | return svc; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | return NULL; |
| 384 | } |
| 385 | |
| 386 | |
| 387 | /* |
| 388 | * Get service by {fwmark} in the service table. |
| 389 | */ |
| 390 | static __inline__ struct ip_vs_service *__ip_vs_svc_fwm_get(__u32 fwmark) |
| 391 | { |
| 392 | unsigned hash; |
| 393 | struct ip_vs_service *svc; |
| 394 | |
| 395 | /* Check for fwmark addressed entries */ |
| 396 | hash = ip_vs_svc_fwm_hashkey(fwmark); |
| 397 | |
| 398 | list_for_each_entry(svc, &ip_vs_svc_fwm_table[hash], f_list) { |
| 399 | if (svc->fwmark == fwmark) { |
| 400 | /* HIT */ |
| 401 | atomic_inc(&svc->usecnt); |
| 402 | return svc; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | return NULL; |
| 407 | } |
| 408 | |
| 409 | struct ip_vs_service * |
| 410 | ip_vs_service_get(__u32 fwmark, __u16 protocol, __u32 vaddr, __u16 vport) |
| 411 | { |
| 412 | struct ip_vs_service *svc; |
| 413 | |
| 414 | read_lock(&__ip_vs_svc_lock); |
| 415 | |
| 416 | /* |
| 417 | * Check the table hashed by fwmark first |
| 418 | */ |
| 419 | if (fwmark && (svc = __ip_vs_svc_fwm_get(fwmark))) |
| 420 | goto out; |
| 421 | |
| 422 | /* |
| 423 | * Check the table hashed by <protocol,addr,port> |
| 424 | * for "full" addressed entries |
| 425 | */ |
| 426 | svc = __ip_vs_service_get(protocol, vaddr, vport); |
| 427 | |
| 428 | if (svc == NULL |
| 429 | && protocol == IPPROTO_TCP |
| 430 | && atomic_read(&ip_vs_ftpsvc_counter) |
| 431 | && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) { |
| 432 | /* |
| 433 | * Check if ftp service entry exists, the packet |
| 434 | * might belong to FTP data connections. |
| 435 | */ |
| 436 | svc = __ip_vs_service_get(protocol, vaddr, FTPPORT); |
| 437 | } |
| 438 | |
| 439 | if (svc == NULL |
| 440 | && atomic_read(&ip_vs_nullsvc_counter)) { |
| 441 | /* |
| 442 | * Check if the catch-all port (port zero) exists |
| 443 | */ |
| 444 | svc = __ip_vs_service_get(protocol, vaddr, 0); |
| 445 | } |
| 446 | |
| 447 | out: |
| 448 | read_unlock(&__ip_vs_svc_lock); |
| 449 | |
| 450 | IP_VS_DBG(6, "lookup service: fwm %u %s %u.%u.%u.%u:%u %s\n", |
| 451 | fwmark, ip_vs_proto_name(protocol), |
| 452 | NIPQUAD(vaddr), ntohs(vport), |
| 453 | svc?"hit":"not hit"); |
| 454 | |
| 455 | return svc; |
| 456 | } |
| 457 | |
| 458 | |
| 459 | static inline void |
| 460 | __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc) |
| 461 | { |
| 462 | atomic_inc(&svc->refcnt); |
| 463 | dest->svc = svc; |
| 464 | } |
| 465 | |
| 466 | static inline void |
| 467 | __ip_vs_unbind_svc(struct ip_vs_dest *dest) |
| 468 | { |
| 469 | struct ip_vs_service *svc = dest->svc; |
| 470 | |
| 471 | dest->svc = NULL; |
| 472 | if (atomic_dec_and_test(&svc->refcnt)) |
| 473 | kfree(svc); |
| 474 | } |
| 475 | |
| 476 | |
| 477 | /* |
| 478 | * Returns hash value for real service |
| 479 | */ |
| 480 | static __inline__ unsigned ip_vs_rs_hashkey(__u32 addr, __u16 port) |
| 481 | { |
| 482 | register unsigned porth = ntohs(port); |
| 483 | |
| 484 | return (ntohl(addr)^(porth>>IP_VS_RTAB_BITS)^porth) |
| 485 | & IP_VS_RTAB_MASK; |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Hashes ip_vs_dest in ip_vs_rtable by <proto,addr,port>. |
| 490 | * should be called with locked tables. |
| 491 | */ |
| 492 | static int ip_vs_rs_hash(struct ip_vs_dest *dest) |
| 493 | { |
| 494 | unsigned hash; |
| 495 | |
| 496 | if (!list_empty(&dest->d_list)) { |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * Hash by proto,addr,port, |
| 502 | * which are the parameters of the real service. |
| 503 | */ |
| 504 | hash = ip_vs_rs_hashkey(dest->addr, dest->port); |
| 505 | list_add(&dest->d_list, &ip_vs_rtable[hash]); |
| 506 | |
| 507 | return 1; |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * UNhashes ip_vs_dest from ip_vs_rtable. |
| 512 | * should be called with locked tables. |
| 513 | */ |
| 514 | static int ip_vs_rs_unhash(struct ip_vs_dest *dest) |
| 515 | { |
| 516 | /* |
| 517 | * Remove it from the ip_vs_rtable table. |
| 518 | */ |
| 519 | if (!list_empty(&dest->d_list)) { |
| 520 | list_del(&dest->d_list); |
| 521 | INIT_LIST_HEAD(&dest->d_list); |
| 522 | } |
| 523 | |
| 524 | return 1; |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Lookup real service by <proto,addr,port> in the real service table. |
| 529 | */ |
| 530 | struct ip_vs_dest * |
| 531 | ip_vs_lookup_real_service(__u16 protocol, __u32 daddr, __u16 dport) |
| 532 | { |
| 533 | unsigned hash; |
| 534 | struct ip_vs_dest *dest; |
| 535 | |
| 536 | /* |
| 537 | * Check for "full" addressed entries |
| 538 | * Return the first found entry |
| 539 | */ |
| 540 | hash = ip_vs_rs_hashkey(daddr, dport); |
| 541 | |
| 542 | read_lock(&__ip_vs_rs_lock); |
| 543 | list_for_each_entry(dest, &ip_vs_rtable[hash], d_list) { |
| 544 | if ((dest->addr == daddr) |
| 545 | && (dest->port == dport) |
| 546 | && ((dest->protocol == protocol) || |
| 547 | dest->vfwmark)) { |
| 548 | /* HIT */ |
| 549 | read_unlock(&__ip_vs_rs_lock); |
| 550 | return dest; |
| 551 | } |
| 552 | } |
| 553 | read_unlock(&__ip_vs_rs_lock); |
| 554 | |
| 555 | return NULL; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Lookup destination by {addr,port} in the given service |
| 560 | */ |
| 561 | static struct ip_vs_dest * |
| 562 | ip_vs_lookup_dest(struct ip_vs_service *svc, __u32 daddr, __u16 dport) |
| 563 | { |
| 564 | struct ip_vs_dest *dest; |
| 565 | |
| 566 | /* |
| 567 | * Find the destination for the given service |
| 568 | */ |
| 569 | list_for_each_entry(dest, &svc->destinations, n_list) { |
| 570 | if ((dest->addr == daddr) && (dest->port == dport)) { |
| 571 | /* HIT */ |
| 572 | return dest; |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | return NULL; |
| 577 | } |
| 578 | |
| 579 | |
| 580 | /* |
| 581 | * Lookup dest by {svc,addr,port} in the destination trash. |
| 582 | * The destination trash is used to hold the destinations that are removed |
| 583 | * from the service table but are still referenced by some conn entries. |
| 584 | * The reason to add the destination trash is when the dest is temporary |
| 585 | * down (either by administrator or by monitor program), the dest can be |
| 586 | * picked back from the trash, the remaining connections to the dest can |
| 587 | * continue, and the counting information of the dest is also useful for |
| 588 | * scheduling. |
| 589 | */ |
| 590 | static struct ip_vs_dest * |
| 591 | ip_vs_trash_get_dest(struct ip_vs_service *svc, __u32 daddr, __u16 dport) |
| 592 | { |
| 593 | struct ip_vs_dest *dest, *nxt; |
| 594 | |
| 595 | /* |
| 596 | * Find the destination in trash |
| 597 | */ |
| 598 | list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) { |
| 599 | IP_VS_DBG(3, "Destination %u/%u.%u.%u.%u:%u still in trash, " |
| 600 | "refcnt=%d\n", |
| 601 | dest->vfwmark, |
| 602 | NIPQUAD(dest->addr), ntohs(dest->port), |
| 603 | atomic_read(&dest->refcnt)); |
| 604 | if (dest->addr == daddr && |
| 605 | dest->port == dport && |
| 606 | dest->vfwmark == svc->fwmark && |
| 607 | dest->protocol == svc->protocol && |
| 608 | (svc->fwmark || |
| 609 | (dest->vaddr == svc->addr && |
| 610 | dest->vport == svc->port))) { |
| 611 | /* HIT */ |
| 612 | return dest; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Try to purge the destination from trash if not referenced |
| 617 | */ |
| 618 | if (atomic_read(&dest->refcnt) == 1) { |
| 619 | IP_VS_DBG(3, "Removing destination %u/%u.%u.%u.%u:%u " |
| 620 | "from trash\n", |
| 621 | dest->vfwmark, |
| 622 | NIPQUAD(dest->addr), ntohs(dest->port)); |
| 623 | list_del(&dest->n_list); |
| 624 | ip_vs_dst_reset(dest); |
| 625 | __ip_vs_unbind_svc(dest); |
| 626 | kfree(dest); |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | return NULL; |
| 631 | } |
| 632 | |
| 633 | |
| 634 | /* |
| 635 | * Clean up all the destinations in the trash |
| 636 | * Called by the ip_vs_control_cleanup() |
| 637 | * |
| 638 | * When the ip_vs_control_clearup is activated by ipvs module exit, |
| 639 | * the service tables must have been flushed and all the connections |
| 640 | * are expired, and the refcnt of each destination in the trash must |
| 641 | * be 1, so we simply release them here. |
| 642 | */ |
| 643 | static void ip_vs_trash_cleanup(void) |
| 644 | { |
| 645 | struct ip_vs_dest *dest, *nxt; |
| 646 | |
| 647 | list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) { |
| 648 | list_del(&dest->n_list); |
| 649 | ip_vs_dst_reset(dest); |
| 650 | __ip_vs_unbind_svc(dest); |
| 651 | kfree(dest); |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | |
| 656 | static void |
| 657 | ip_vs_zero_stats(struct ip_vs_stats *stats) |
| 658 | { |
| 659 | spin_lock_bh(&stats->lock); |
| 660 | memset(stats, 0, (char *)&stats->lock - (char *)stats); |
| 661 | spin_unlock_bh(&stats->lock); |
| 662 | ip_vs_zero_estimator(stats); |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * Update a destination in the given service |
| 667 | */ |
| 668 | static void |
| 669 | __ip_vs_update_dest(struct ip_vs_service *svc, |
| 670 | struct ip_vs_dest *dest, struct ip_vs_dest_user *udest) |
| 671 | { |
| 672 | int conn_flags; |
| 673 | |
| 674 | /* set the weight and the flags */ |
| 675 | atomic_set(&dest->weight, udest->weight); |
| 676 | conn_flags = udest->conn_flags | IP_VS_CONN_F_INACTIVE; |
| 677 | |
| 678 | /* check if local node and update the flags */ |
| 679 | if (inet_addr_type(udest->addr) == RTN_LOCAL) { |
| 680 | conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK) |
| 681 | | IP_VS_CONN_F_LOCALNODE; |
| 682 | } |
| 683 | |
| 684 | /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */ |
| 685 | if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != 0) { |
| 686 | conn_flags |= IP_VS_CONN_F_NOOUTPUT; |
| 687 | } else { |
| 688 | /* |
| 689 | * Put the real service in ip_vs_rtable if not present. |
| 690 | * For now only for NAT! |
| 691 | */ |
| 692 | write_lock_bh(&__ip_vs_rs_lock); |
| 693 | ip_vs_rs_hash(dest); |
| 694 | write_unlock_bh(&__ip_vs_rs_lock); |
| 695 | } |
| 696 | atomic_set(&dest->conn_flags, conn_flags); |
| 697 | |
| 698 | /* bind the service */ |
| 699 | if (!dest->svc) { |
| 700 | __ip_vs_bind_svc(dest, svc); |
| 701 | } else { |
| 702 | if (dest->svc != svc) { |
| 703 | __ip_vs_unbind_svc(dest); |
| 704 | ip_vs_zero_stats(&dest->stats); |
| 705 | __ip_vs_bind_svc(dest, svc); |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | /* set the dest status flags */ |
| 710 | dest->flags |= IP_VS_DEST_F_AVAILABLE; |
| 711 | |
| 712 | if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold) |
| 713 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; |
| 714 | dest->u_threshold = udest->u_threshold; |
| 715 | dest->l_threshold = udest->l_threshold; |
| 716 | } |
| 717 | |
| 718 | |
| 719 | /* |
| 720 | * Create a destination for the given service |
| 721 | */ |
| 722 | static int |
| 723 | ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest, |
| 724 | struct ip_vs_dest **dest_p) |
| 725 | { |
| 726 | struct ip_vs_dest *dest; |
| 727 | unsigned atype; |
| 728 | |
| 729 | EnterFunction(2); |
| 730 | |
| 731 | atype = inet_addr_type(udest->addr); |
| 732 | if (atype != RTN_LOCAL && atype != RTN_UNICAST) |
| 733 | return -EINVAL; |
| 734 | |
| 735 | dest = kmalloc(sizeof(struct ip_vs_dest), GFP_ATOMIC); |
| 736 | if (dest == NULL) { |
| 737 | IP_VS_ERR("ip_vs_new_dest: kmalloc failed.\n"); |
| 738 | return -ENOMEM; |
| 739 | } |
| 740 | memset(dest, 0, sizeof(struct ip_vs_dest)); |
| 741 | |
| 742 | dest->protocol = svc->protocol; |
| 743 | dest->vaddr = svc->addr; |
| 744 | dest->vport = svc->port; |
| 745 | dest->vfwmark = svc->fwmark; |
| 746 | dest->addr = udest->addr; |
| 747 | dest->port = udest->port; |
| 748 | |
| 749 | atomic_set(&dest->activeconns, 0); |
| 750 | atomic_set(&dest->inactconns, 0); |
| 751 | atomic_set(&dest->persistconns, 0); |
| 752 | atomic_set(&dest->refcnt, 0); |
| 753 | |
| 754 | INIT_LIST_HEAD(&dest->d_list); |
| 755 | spin_lock_init(&dest->dst_lock); |
| 756 | spin_lock_init(&dest->stats.lock); |
| 757 | __ip_vs_update_dest(svc, dest, udest); |
| 758 | ip_vs_new_estimator(&dest->stats); |
| 759 | |
| 760 | *dest_p = dest; |
| 761 | |
| 762 | LeaveFunction(2); |
| 763 | return 0; |
| 764 | } |
| 765 | |
| 766 | |
| 767 | /* |
| 768 | * Add a destination into an existing service |
| 769 | */ |
| 770 | static int |
| 771 | ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest) |
| 772 | { |
| 773 | struct ip_vs_dest *dest; |
| 774 | __u32 daddr = udest->addr; |
| 775 | __u16 dport = udest->port; |
| 776 | int ret; |
| 777 | |
| 778 | EnterFunction(2); |
| 779 | |
| 780 | if (udest->weight < 0) { |
| 781 | IP_VS_ERR("ip_vs_add_dest(): server weight less than zero\n"); |
| 782 | return -ERANGE; |
| 783 | } |
| 784 | |
| 785 | if (udest->l_threshold > udest->u_threshold) { |
| 786 | IP_VS_ERR("ip_vs_add_dest(): lower threshold is higher than " |
| 787 | "upper threshold\n"); |
| 788 | return -ERANGE; |
| 789 | } |
| 790 | |
| 791 | /* |
| 792 | * Check if the dest already exists in the list |
| 793 | */ |
| 794 | dest = ip_vs_lookup_dest(svc, daddr, dport); |
| 795 | if (dest != NULL) { |
| 796 | IP_VS_DBG(1, "ip_vs_add_dest(): dest already exists\n"); |
| 797 | return -EEXIST; |
| 798 | } |
| 799 | |
| 800 | /* |
| 801 | * Check if the dest already exists in the trash and |
| 802 | * is from the same service |
| 803 | */ |
| 804 | dest = ip_vs_trash_get_dest(svc, daddr, dport); |
| 805 | if (dest != NULL) { |
| 806 | IP_VS_DBG(3, "Get destination %u.%u.%u.%u:%u from trash, " |
| 807 | "refcnt=%d, service %u/%u.%u.%u.%u:%u\n", |
| 808 | NIPQUAD(daddr), ntohs(dport), |
| 809 | atomic_read(&dest->refcnt), |
| 810 | dest->vfwmark, |
| 811 | NIPQUAD(dest->vaddr), |
| 812 | ntohs(dest->vport)); |
| 813 | __ip_vs_update_dest(svc, dest, udest); |
| 814 | |
| 815 | /* |
| 816 | * Get the destination from the trash |
| 817 | */ |
| 818 | list_del(&dest->n_list); |
| 819 | |
| 820 | ip_vs_new_estimator(&dest->stats); |
| 821 | |
| 822 | write_lock_bh(&__ip_vs_svc_lock); |
| 823 | |
| 824 | /* |
| 825 | * Wait until all other svc users go away. |
| 826 | */ |
| 827 | IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1); |
| 828 | |
| 829 | list_add(&dest->n_list, &svc->destinations); |
| 830 | svc->num_dests++; |
| 831 | |
| 832 | /* call the update_service function of its scheduler */ |
| 833 | svc->scheduler->update_service(svc); |
| 834 | |
| 835 | write_unlock_bh(&__ip_vs_svc_lock); |
| 836 | return 0; |
| 837 | } |
| 838 | |
| 839 | /* |
| 840 | * Allocate and initialize the dest structure |
| 841 | */ |
| 842 | ret = ip_vs_new_dest(svc, udest, &dest); |
| 843 | if (ret) { |
| 844 | return ret; |
| 845 | } |
| 846 | |
| 847 | /* |
| 848 | * Add the dest entry into the list |
| 849 | */ |
| 850 | atomic_inc(&dest->refcnt); |
| 851 | |
| 852 | write_lock_bh(&__ip_vs_svc_lock); |
| 853 | |
| 854 | /* |
| 855 | * Wait until all other svc users go away. |
| 856 | */ |
| 857 | IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1); |
| 858 | |
| 859 | list_add(&dest->n_list, &svc->destinations); |
| 860 | svc->num_dests++; |
| 861 | |
| 862 | /* call the update_service function of its scheduler */ |
| 863 | svc->scheduler->update_service(svc); |
| 864 | |
| 865 | write_unlock_bh(&__ip_vs_svc_lock); |
| 866 | |
| 867 | LeaveFunction(2); |
| 868 | |
| 869 | return 0; |
| 870 | } |
| 871 | |
| 872 | |
| 873 | /* |
| 874 | * Edit a destination in the given service |
| 875 | */ |
| 876 | static int |
| 877 | ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest) |
| 878 | { |
| 879 | struct ip_vs_dest *dest; |
| 880 | __u32 daddr = udest->addr; |
| 881 | __u16 dport = udest->port; |
| 882 | |
| 883 | EnterFunction(2); |
| 884 | |
| 885 | if (udest->weight < 0) { |
| 886 | IP_VS_ERR("ip_vs_edit_dest(): server weight less than zero\n"); |
| 887 | return -ERANGE; |
| 888 | } |
| 889 | |
| 890 | if (udest->l_threshold > udest->u_threshold) { |
| 891 | IP_VS_ERR("ip_vs_edit_dest(): lower threshold is higher than " |
| 892 | "upper threshold\n"); |
| 893 | return -ERANGE; |
| 894 | } |
| 895 | |
| 896 | /* |
| 897 | * Lookup the destination list |
| 898 | */ |
| 899 | dest = ip_vs_lookup_dest(svc, daddr, dport); |
| 900 | if (dest == NULL) { |
| 901 | IP_VS_DBG(1, "ip_vs_edit_dest(): dest doesn't exist\n"); |
| 902 | return -ENOENT; |
| 903 | } |
| 904 | |
| 905 | __ip_vs_update_dest(svc, dest, udest); |
| 906 | |
| 907 | write_lock_bh(&__ip_vs_svc_lock); |
| 908 | |
| 909 | /* Wait until all other svc users go away */ |
| 910 | while (atomic_read(&svc->usecnt) > 1) {}; |
| 911 | |
| 912 | /* call the update_service, because server weight may be changed */ |
| 913 | svc->scheduler->update_service(svc); |
| 914 | |
| 915 | write_unlock_bh(&__ip_vs_svc_lock); |
| 916 | |
| 917 | LeaveFunction(2); |
| 918 | |
| 919 | return 0; |
| 920 | } |
| 921 | |
| 922 | |
| 923 | /* |
| 924 | * Delete a destination (must be already unlinked from the service) |
| 925 | */ |
| 926 | static void __ip_vs_del_dest(struct ip_vs_dest *dest) |
| 927 | { |
| 928 | ip_vs_kill_estimator(&dest->stats); |
| 929 | |
| 930 | /* |
| 931 | * Remove it from the d-linked list with the real services. |
| 932 | */ |
| 933 | write_lock_bh(&__ip_vs_rs_lock); |
| 934 | ip_vs_rs_unhash(dest); |
| 935 | write_unlock_bh(&__ip_vs_rs_lock); |
| 936 | |
| 937 | /* |
| 938 | * Decrease the refcnt of the dest, and free the dest |
| 939 | * if nobody refers to it (refcnt=0). Otherwise, throw |
| 940 | * the destination into the trash. |
| 941 | */ |
| 942 | if (atomic_dec_and_test(&dest->refcnt)) { |
| 943 | ip_vs_dst_reset(dest); |
| 944 | /* simply decrease svc->refcnt here, let the caller check |
| 945 | and release the service if nobody refers to it. |
| 946 | Only user context can release destination and service, |
| 947 | and only one user context can update virtual service at a |
| 948 | time, so the operation here is OK */ |
| 949 | atomic_dec(&dest->svc->refcnt); |
| 950 | kfree(dest); |
| 951 | } else { |
| 952 | IP_VS_DBG(3, "Moving dest %u.%u.%u.%u:%u into trash, refcnt=%d\n", |
| 953 | NIPQUAD(dest->addr), ntohs(dest->port), |
| 954 | atomic_read(&dest->refcnt)); |
| 955 | list_add(&dest->n_list, &ip_vs_dest_trash); |
| 956 | atomic_inc(&dest->refcnt); |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | |
| 961 | /* |
| 962 | * Unlink a destination from the given service |
| 963 | */ |
| 964 | static void __ip_vs_unlink_dest(struct ip_vs_service *svc, |
| 965 | struct ip_vs_dest *dest, |
| 966 | int svcupd) |
| 967 | { |
| 968 | dest->flags &= ~IP_VS_DEST_F_AVAILABLE; |
| 969 | |
| 970 | /* |
| 971 | * Remove it from the d-linked destination list. |
| 972 | */ |
| 973 | list_del(&dest->n_list); |
| 974 | svc->num_dests--; |
| 975 | if (svcupd) { |
| 976 | /* |
| 977 | * Call the update_service function of its scheduler |
| 978 | */ |
| 979 | svc->scheduler->update_service(svc); |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | |
| 984 | /* |
| 985 | * Delete a destination server in the given service |
| 986 | */ |
| 987 | static int |
| 988 | ip_vs_del_dest(struct ip_vs_service *svc,struct ip_vs_dest_user *udest) |
| 989 | { |
| 990 | struct ip_vs_dest *dest; |
| 991 | __u32 daddr = udest->addr; |
| 992 | __u16 dport = udest->port; |
| 993 | |
| 994 | EnterFunction(2); |
| 995 | |
| 996 | dest = ip_vs_lookup_dest(svc, daddr, dport); |
| 997 | if (dest == NULL) { |
| 998 | IP_VS_DBG(1, "ip_vs_del_dest(): destination not found!\n"); |
| 999 | return -ENOENT; |
| 1000 | } |
| 1001 | |
| 1002 | write_lock_bh(&__ip_vs_svc_lock); |
| 1003 | |
| 1004 | /* |
| 1005 | * Wait until all other svc users go away. |
| 1006 | */ |
| 1007 | IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1); |
| 1008 | |
| 1009 | /* |
| 1010 | * Unlink dest from the service |
| 1011 | */ |
| 1012 | __ip_vs_unlink_dest(svc, dest, 1); |
| 1013 | |
| 1014 | write_unlock_bh(&__ip_vs_svc_lock); |
| 1015 | |
| 1016 | /* |
| 1017 | * Delete the destination |
| 1018 | */ |
| 1019 | __ip_vs_del_dest(dest); |
| 1020 | |
| 1021 | LeaveFunction(2); |
| 1022 | |
| 1023 | return 0; |
| 1024 | } |
| 1025 | |
| 1026 | |
| 1027 | /* |
| 1028 | * Add a service into the service hash table |
| 1029 | */ |
| 1030 | static int |
| 1031 | ip_vs_add_service(struct ip_vs_service_user *u, struct ip_vs_service **svc_p) |
| 1032 | { |
| 1033 | int ret = 0; |
| 1034 | struct ip_vs_scheduler *sched = NULL; |
| 1035 | struct ip_vs_service *svc = NULL; |
| 1036 | |
| 1037 | /* increase the module use count */ |
| 1038 | ip_vs_use_count_inc(); |
| 1039 | |
| 1040 | /* Lookup the scheduler by 'u->sched_name' */ |
| 1041 | sched = ip_vs_scheduler_get(u->sched_name); |
| 1042 | if (sched == NULL) { |
| 1043 | IP_VS_INFO("Scheduler module ip_vs_%s not found\n", |
| 1044 | u->sched_name); |
| 1045 | ret = -ENOENT; |
| 1046 | goto out_mod_dec; |
| 1047 | } |
| 1048 | |
| 1049 | svc = (struct ip_vs_service *) |
| 1050 | kmalloc(sizeof(struct ip_vs_service), GFP_ATOMIC); |
| 1051 | if (svc == NULL) { |
| 1052 | IP_VS_DBG(1, "ip_vs_add_service: kmalloc failed.\n"); |
| 1053 | ret = -ENOMEM; |
| 1054 | goto out_err; |
| 1055 | } |
| 1056 | memset(svc, 0, sizeof(struct ip_vs_service)); |
| 1057 | |
| 1058 | /* I'm the first user of the service */ |
| 1059 | atomic_set(&svc->usecnt, 1); |
| 1060 | atomic_set(&svc->refcnt, 0); |
| 1061 | |
| 1062 | svc->protocol = u->protocol; |
| 1063 | svc->addr = u->addr; |
| 1064 | svc->port = u->port; |
| 1065 | svc->fwmark = u->fwmark; |
| 1066 | svc->flags = u->flags; |
| 1067 | svc->timeout = u->timeout * HZ; |
| 1068 | svc->netmask = u->netmask; |
| 1069 | |
| 1070 | INIT_LIST_HEAD(&svc->destinations); |
| 1071 | rwlock_init(&svc->sched_lock); |
| 1072 | spin_lock_init(&svc->stats.lock); |
| 1073 | |
| 1074 | /* Bind the scheduler */ |
| 1075 | ret = ip_vs_bind_scheduler(svc, sched); |
| 1076 | if (ret) |
| 1077 | goto out_err; |
| 1078 | sched = NULL; |
| 1079 | |
| 1080 | /* Update the virtual service counters */ |
| 1081 | if (svc->port == FTPPORT) |
| 1082 | atomic_inc(&ip_vs_ftpsvc_counter); |
| 1083 | else if (svc->port == 0) |
| 1084 | atomic_inc(&ip_vs_nullsvc_counter); |
| 1085 | |
| 1086 | ip_vs_new_estimator(&svc->stats); |
| 1087 | ip_vs_num_services++; |
| 1088 | |
| 1089 | /* Hash the service into the service table */ |
| 1090 | write_lock_bh(&__ip_vs_svc_lock); |
| 1091 | ip_vs_svc_hash(svc); |
| 1092 | write_unlock_bh(&__ip_vs_svc_lock); |
| 1093 | |
| 1094 | *svc_p = svc; |
| 1095 | return 0; |
| 1096 | |
| 1097 | out_err: |
| 1098 | if (svc != NULL) { |
| 1099 | if (svc->scheduler) |
| 1100 | ip_vs_unbind_scheduler(svc); |
| 1101 | if (svc->inc) { |
| 1102 | local_bh_disable(); |
| 1103 | ip_vs_app_inc_put(svc->inc); |
| 1104 | local_bh_enable(); |
| 1105 | } |
| 1106 | kfree(svc); |
| 1107 | } |
| 1108 | ip_vs_scheduler_put(sched); |
| 1109 | |
| 1110 | out_mod_dec: |
| 1111 | /* decrease the module use count */ |
| 1112 | ip_vs_use_count_dec(); |
| 1113 | |
| 1114 | return ret; |
| 1115 | } |
| 1116 | |
| 1117 | |
| 1118 | /* |
| 1119 | * Edit a service and bind it with a new scheduler |
| 1120 | */ |
| 1121 | static int |
| 1122 | ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user *u) |
| 1123 | { |
| 1124 | struct ip_vs_scheduler *sched, *old_sched; |
| 1125 | int ret = 0; |
| 1126 | |
| 1127 | /* |
| 1128 | * Lookup the scheduler, by 'u->sched_name' |
| 1129 | */ |
| 1130 | sched = ip_vs_scheduler_get(u->sched_name); |
| 1131 | if (sched == NULL) { |
| 1132 | IP_VS_INFO("Scheduler module ip_vs_%s not found\n", |
| 1133 | u->sched_name); |
| 1134 | return -ENOENT; |
| 1135 | } |
| 1136 | old_sched = sched; |
| 1137 | |
| 1138 | write_lock_bh(&__ip_vs_svc_lock); |
| 1139 | |
| 1140 | /* |
| 1141 | * Wait until all other svc users go away. |
| 1142 | */ |
| 1143 | IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1); |
| 1144 | |
| 1145 | /* |
| 1146 | * Set the flags and timeout value |
| 1147 | */ |
| 1148 | svc->flags = u->flags | IP_VS_SVC_F_HASHED; |
| 1149 | svc->timeout = u->timeout * HZ; |
| 1150 | svc->netmask = u->netmask; |
| 1151 | |
| 1152 | old_sched = svc->scheduler; |
| 1153 | if (sched != old_sched) { |
| 1154 | /* |
| 1155 | * Unbind the old scheduler |
| 1156 | */ |
| 1157 | if ((ret = ip_vs_unbind_scheduler(svc))) { |
| 1158 | old_sched = sched; |
| 1159 | goto out; |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * Bind the new scheduler |
| 1164 | */ |
| 1165 | if ((ret = ip_vs_bind_scheduler(svc, sched))) { |
| 1166 | /* |
| 1167 | * If ip_vs_bind_scheduler fails, restore the old |
| 1168 | * scheduler. |
| 1169 | * The main reason of failure is out of memory. |
| 1170 | * |
| 1171 | * The question is if the old scheduler can be |
| 1172 | * restored all the time. TODO: if it cannot be |
| 1173 | * restored some time, we must delete the service, |
| 1174 | * otherwise the system may crash. |
| 1175 | */ |
| 1176 | ip_vs_bind_scheduler(svc, old_sched); |
| 1177 | old_sched = sched; |
| 1178 | goto out; |
| 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | out: |
| 1183 | write_unlock_bh(&__ip_vs_svc_lock); |
| 1184 | |
| 1185 | if (old_sched) |
| 1186 | ip_vs_scheduler_put(old_sched); |
| 1187 | |
| 1188 | return ret; |
| 1189 | } |
| 1190 | |
| 1191 | |
| 1192 | /* |
| 1193 | * Delete a service from the service list |
| 1194 | * - The service must be unlinked, unlocked and not referenced! |
| 1195 | * - We are called under _bh lock |
| 1196 | */ |
| 1197 | static void __ip_vs_del_service(struct ip_vs_service *svc) |
| 1198 | { |
| 1199 | struct ip_vs_dest *dest, *nxt; |
| 1200 | struct ip_vs_scheduler *old_sched; |
| 1201 | |
| 1202 | ip_vs_num_services--; |
| 1203 | ip_vs_kill_estimator(&svc->stats); |
| 1204 | |
| 1205 | /* Unbind scheduler */ |
| 1206 | old_sched = svc->scheduler; |
| 1207 | ip_vs_unbind_scheduler(svc); |
| 1208 | if (old_sched) |
| 1209 | ip_vs_scheduler_put(old_sched); |
| 1210 | |
| 1211 | /* Unbind app inc */ |
| 1212 | if (svc->inc) { |
| 1213 | ip_vs_app_inc_put(svc->inc); |
| 1214 | svc->inc = NULL; |
| 1215 | } |
| 1216 | |
| 1217 | /* |
| 1218 | * Unlink the whole destination list |
| 1219 | */ |
| 1220 | list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) { |
| 1221 | __ip_vs_unlink_dest(svc, dest, 0); |
| 1222 | __ip_vs_del_dest(dest); |
| 1223 | } |
| 1224 | |
| 1225 | /* |
| 1226 | * Update the virtual service counters |
| 1227 | */ |
| 1228 | if (svc->port == FTPPORT) |
| 1229 | atomic_dec(&ip_vs_ftpsvc_counter); |
| 1230 | else if (svc->port == 0) |
| 1231 | atomic_dec(&ip_vs_nullsvc_counter); |
| 1232 | |
| 1233 | /* |
| 1234 | * Free the service if nobody refers to it |
| 1235 | */ |
| 1236 | if (atomic_read(&svc->refcnt) == 0) |
| 1237 | kfree(svc); |
| 1238 | |
| 1239 | /* decrease the module use count */ |
| 1240 | ip_vs_use_count_dec(); |
| 1241 | } |
| 1242 | |
| 1243 | /* |
| 1244 | * Delete a service from the service list |
| 1245 | */ |
| 1246 | static int ip_vs_del_service(struct ip_vs_service *svc) |
| 1247 | { |
| 1248 | if (svc == NULL) |
| 1249 | return -EEXIST; |
| 1250 | |
| 1251 | /* |
| 1252 | * Unhash it from the service table |
| 1253 | */ |
| 1254 | write_lock_bh(&__ip_vs_svc_lock); |
| 1255 | |
| 1256 | ip_vs_svc_unhash(svc); |
| 1257 | |
| 1258 | /* |
| 1259 | * Wait until all the svc users go away. |
| 1260 | */ |
| 1261 | IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1); |
| 1262 | |
| 1263 | __ip_vs_del_service(svc); |
| 1264 | |
| 1265 | write_unlock_bh(&__ip_vs_svc_lock); |
| 1266 | |
| 1267 | return 0; |
| 1268 | } |
| 1269 | |
| 1270 | |
| 1271 | /* |
| 1272 | * Flush all the virtual services |
| 1273 | */ |
| 1274 | static int ip_vs_flush(void) |
| 1275 | { |
| 1276 | int idx; |
| 1277 | struct ip_vs_service *svc, *nxt; |
| 1278 | |
| 1279 | /* |
| 1280 | * Flush the service table hashed by <protocol,addr,port> |
| 1281 | */ |
| 1282 | for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 1283 | list_for_each_entry_safe(svc, nxt, &ip_vs_svc_table[idx], s_list) { |
| 1284 | write_lock_bh(&__ip_vs_svc_lock); |
| 1285 | ip_vs_svc_unhash(svc); |
| 1286 | /* |
| 1287 | * Wait until all the svc users go away. |
| 1288 | */ |
| 1289 | IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0); |
| 1290 | __ip_vs_del_service(svc); |
| 1291 | write_unlock_bh(&__ip_vs_svc_lock); |
| 1292 | } |
| 1293 | } |
| 1294 | |
| 1295 | /* |
| 1296 | * Flush the service table hashed by fwmark |
| 1297 | */ |
| 1298 | for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 1299 | list_for_each_entry_safe(svc, nxt, |
| 1300 | &ip_vs_svc_fwm_table[idx], f_list) { |
| 1301 | write_lock_bh(&__ip_vs_svc_lock); |
| 1302 | ip_vs_svc_unhash(svc); |
| 1303 | /* |
| 1304 | * Wait until all the svc users go away. |
| 1305 | */ |
| 1306 | IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0); |
| 1307 | __ip_vs_del_service(svc); |
| 1308 | write_unlock_bh(&__ip_vs_svc_lock); |
| 1309 | } |
| 1310 | } |
| 1311 | |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | |
| 1316 | /* |
| 1317 | * Zero counters in a service or all services |
| 1318 | */ |
| 1319 | static int ip_vs_zero_service(struct ip_vs_service *svc) |
| 1320 | { |
| 1321 | struct ip_vs_dest *dest; |
| 1322 | |
| 1323 | write_lock_bh(&__ip_vs_svc_lock); |
| 1324 | list_for_each_entry(dest, &svc->destinations, n_list) { |
| 1325 | ip_vs_zero_stats(&dest->stats); |
| 1326 | } |
| 1327 | ip_vs_zero_stats(&svc->stats); |
| 1328 | write_unlock_bh(&__ip_vs_svc_lock); |
| 1329 | return 0; |
| 1330 | } |
| 1331 | |
| 1332 | static int ip_vs_zero_all(void) |
| 1333 | { |
| 1334 | int idx; |
| 1335 | struct ip_vs_service *svc; |
| 1336 | |
| 1337 | for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 1338 | list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) { |
| 1339 | ip_vs_zero_service(svc); |
| 1340 | } |
| 1341 | } |
| 1342 | |
| 1343 | for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 1344 | list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) { |
| 1345 | ip_vs_zero_service(svc); |
| 1346 | } |
| 1347 | } |
| 1348 | |
| 1349 | ip_vs_zero_stats(&ip_vs_stats); |
| 1350 | return 0; |
| 1351 | } |
| 1352 | |
| 1353 | |
| 1354 | static int |
| 1355 | proc_do_defense_mode(ctl_table *table, int write, struct file * filp, |
| 1356 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 1357 | { |
| 1358 | int *valp = table->data; |
| 1359 | int val = *valp; |
| 1360 | int rc; |
| 1361 | |
| 1362 | rc = proc_dointvec(table, write, filp, buffer, lenp, ppos); |
| 1363 | if (write && (*valp != val)) { |
| 1364 | if ((*valp < 0) || (*valp > 3)) { |
| 1365 | /* Restore the correct value */ |
| 1366 | *valp = val; |
| 1367 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | update_defense_level(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | } |
| 1370 | } |
| 1371 | return rc; |
| 1372 | } |
| 1373 | |
| 1374 | |
| 1375 | static int |
| 1376 | proc_do_sync_threshold(ctl_table *table, int write, struct file *filp, |
| 1377 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 1378 | { |
| 1379 | int *valp = table->data; |
| 1380 | int val[2]; |
| 1381 | int rc; |
| 1382 | |
| 1383 | /* backup the value first */ |
| 1384 | memcpy(val, valp, sizeof(val)); |
| 1385 | |
| 1386 | rc = proc_dointvec(table, write, filp, buffer, lenp, ppos); |
| 1387 | if (write && (valp[0] < 0 || valp[1] < 0 || valp[0] >= valp[1])) { |
| 1388 | /* Restore the correct value */ |
| 1389 | memcpy(valp, val, sizeof(val)); |
| 1390 | } |
| 1391 | return rc; |
| 1392 | } |
| 1393 | |
| 1394 | |
| 1395 | /* |
| 1396 | * IPVS sysctl table (under the /proc/sys/net/ipv4/vs/) |
| 1397 | */ |
| 1398 | |
| 1399 | static struct ctl_table vs_vars[] = { |
| 1400 | { |
| 1401 | .ctl_name = NET_IPV4_VS_AMEMTHRESH, |
| 1402 | .procname = "amemthresh", |
| 1403 | .data = &sysctl_ip_vs_amemthresh, |
| 1404 | .maxlen = sizeof(int), |
| 1405 | .mode = 0644, |
| 1406 | .proc_handler = &proc_dointvec, |
| 1407 | }, |
| 1408 | #ifdef CONFIG_IP_VS_DEBUG |
| 1409 | { |
| 1410 | .ctl_name = NET_IPV4_VS_DEBUG_LEVEL, |
| 1411 | .procname = "debug_level", |
| 1412 | .data = &sysctl_ip_vs_debug_level, |
| 1413 | .maxlen = sizeof(int), |
| 1414 | .mode = 0644, |
| 1415 | .proc_handler = &proc_dointvec, |
| 1416 | }, |
| 1417 | #endif |
| 1418 | { |
| 1419 | .ctl_name = NET_IPV4_VS_AMDROPRATE, |
| 1420 | .procname = "am_droprate", |
| 1421 | .data = &sysctl_ip_vs_am_droprate, |
| 1422 | .maxlen = sizeof(int), |
| 1423 | .mode = 0644, |
| 1424 | .proc_handler = &proc_dointvec, |
| 1425 | }, |
| 1426 | { |
| 1427 | .ctl_name = NET_IPV4_VS_DROP_ENTRY, |
| 1428 | .procname = "drop_entry", |
| 1429 | .data = &sysctl_ip_vs_drop_entry, |
| 1430 | .maxlen = sizeof(int), |
| 1431 | .mode = 0644, |
| 1432 | .proc_handler = &proc_do_defense_mode, |
| 1433 | }, |
| 1434 | { |
| 1435 | .ctl_name = NET_IPV4_VS_DROP_PACKET, |
| 1436 | .procname = "drop_packet", |
| 1437 | .data = &sysctl_ip_vs_drop_packet, |
| 1438 | .maxlen = sizeof(int), |
| 1439 | .mode = 0644, |
| 1440 | .proc_handler = &proc_do_defense_mode, |
| 1441 | }, |
| 1442 | { |
| 1443 | .ctl_name = NET_IPV4_VS_SECURE_TCP, |
| 1444 | .procname = "secure_tcp", |
| 1445 | .data = &sysctl_ip_vs_secure_tcp, |
| 1446 | .maxlen = sizeof(int), |
| 1447 | .mode = 0644, |
| 1448 | .proc_handler = &proc_do_defense_mode, |
| 1449 | }, |
| 1450 | #if 0 |
| 1451 | { |
| 1452 | .ctl_name = NET_IPV4_VS_TO_ES, |
| 1453 | .procname = "timeout_established", |
| 1454 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED], |
| 1455 | .maxlen = sizeof(int), |
| 1456 | .mode = 0644, |
| 1457 | .proc_handler = &proc_dointvec_jiffies, |
| 1458 | }, |
| 1459 | { |
| 1460 | .ctl_name = NET_IPV4_VS_TO_SS, |
| 1461 | .procname = "timeout_synsent", |
| 1462 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT], |
| 1463 | .maxlen = sizeof(int), |
| 1464 | .mode = 0644, |
| 1465 | .proc_handler = &proc_dointvec_jiffies, |
| 1466 | }, |
| 1467 | { |
| 1468 | .ctl_name = NET_IPV4_VS_TO_SR, |
| 1469 | .procname = "timeout_synrecv", |
| 1470 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV], |
| 1471 | .maxlen = sizeof(int), |
| 1472 | .mode = 0644, |
| 1473 | .proc_handler = &proc_dointvec_jiffies, |
| 1474 | }, |
| 1475 | { |
| 1476 | .ctl_name = NET_IPV4_VS_TO_FW, |
| 1477 | .procname = "timeout_finwait", |
| 1478 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT], |
| 1479 | .maxlen = sizeof(int), |
| 1480 | .mode = 0644, |
| 1481 | .proc_handler = &proc_dointvec_jiffies, |
| 1482 | }, |
| 1483 | { |
| 1484 | .ctl_name = NET_IPV4_VS_TO_TW, |
| 1485 | .procname = "timeout_timewait", |
| 1486 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT], |
| 1487 | .maxlen = sizeof(int), |
| 1488 | .mode = 0644, |
| 1489 | .proc_handler = &proc_dointvec_jiffies, |
| 1490 | }, |
| 1491 | { |
| 1492 | .ctl_name = NET_IPV4_VS_TO_CL, |
| 1493 | .procname = "timeout_close", |
| 1494 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE], |
| 1495 | .maxlen = sizeof(int), |
| 1496 | .mode = 0644, |
| 1497 | .proc_handler = &proc_dointvec_jiffies, |
| 1498 | }, |
| 1499 | { |
| 1500 | .ctl_name = NET_IPV4_VS_TO_CW, |
| 1501 | .procname = "timeout_closewait", |
| 1502 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT], |
| 1503 | .maxlen = sizeof(int), |
| 1504 | .mode = 0644, |
| 1505 | .proc_handler = &proc_dointvec_jiffies, |
| 1506 | }, |
| 1507 | { |
| 1508 | .ctl_name = NET_IPV4_VS_TO_LA, |
| 1509 | .procname = "timeout_lastack", |
| 1510 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK], |
| 1511 | .maxlen = sizeof(int), |
| 1512 | .mode = 0644, |
| 1513 | .proc_handler = &proc_dointvec_jiffies, |
| 1514 | }, |
| 1515 | { |
| 1516 | .ctl_name = NET_IPV4_VS_TO_LI, |
| 1517 | .procname = "timeout_listen", |
| 1518 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN], |
| 1519 | .maxlen = sizeof(int), |
| 1520 | .mode = 0644, |
| 1521 | .proc_handler = &proc_dointvec_jiffies, |
| 1522 | }, |
| 1523 | { |
| 1524 | .ctl_name = NET_IPV4_VS_TO_SA, |
| 1525 | .procname = "timeout_synack", |
| 1526 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK], |
| 1527 | .maxlen = sizeof(int), |
| 1528 | .mode = 0644, |
| 1529 | .proc_handler = &proc_dointvec_jiffies, |
| 1530 | }, |
| 1531 | { |
| 1532 | .ctl_name = NET_IPV4_VS_TO_UDP, |
| 1533 | .procname = "timeout_udp", |
| 1534 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_UDP], |
| 1535 | .maxlen = sizeof(int), |
| 1536 | .mode = 0644, |
| 1537 | .proc_handler = &proc_dointvec_jiffies, |
| 1538 | }, |
| 1539 | { |
| 1540 | .ctl_name = NET_IPV4_VS_TO_ICMP, |
| 1541 | .procname = "timeout_icmp", |
| 1542 | .data = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP], |
| 1543 | .maxlen = sizeof(int), |
| 1544 | .mode = 0644, |
| 1545 | .proc_handler = &proc_dointvec_jiffies, |
| 1546 | }, |
| 1547 | #endif |
| 1548 | { |
| 1549 | .ctl_name = NET_IPV4_VS_CACHE_BYPASS, |
| 1550 | .procname = "cache_bypass", |
| 1551 | .data = &sysctl_ip_vs_cache_bypass, |
| 1552 | .maxlen = sizeof(int), |
| 1553 | .mode = 0644, |
| 1554 | .proc_handler = &proc_dointvec, |
| 1555 | }, |
| 1556 | { |
| 1557 | .ctl_name = NET_IPV4_VS_EXPIRE_NODEST_CONN, |
| 1558 | .procname = "expire_nodest_conn", |
| 1559 | .data = &sysctl_ip_vs_expire_nodest_conn, |
| 1560 | .maxlen = sizeof(int), |
| 1561 | .mode = 0644, |
| 1562 | .proc_handler = &proc_dointvec, |
| 1563 | }, |
| 1564 | { |
| 1565 | .ctl_name = NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE, |
| 1566 | .procname = "expire_quiescent_template", |
| 1567 | .data = &sysctl_ip_vs_expire_quiescent_template, |
| 1568 | .maxlen = sizeof(int), |
| 1569 | .mode = 0644, |
| 1570 | .proc_handler = &proc_dointvec, |
| 1571 | }, |
| 1572 | { |
| 1573 | .ctl_name = NET_IPV4_VS_SYNC_THRESHOLD, |
| 1574 | .procname = "sync_threshold", |
| 1575 | .data = &sysctl_ip_vs_sync_threshold, |
| 1576 | .maxlen = sizeof(sysctl_ip_vs_sync_threshold), |
| 1577 | .mode = 0644, |
| 1578 | .proc_handler = &proc_do_sync_threshold, |
| 1579 | }, |
| 1580 | { |
| 1581 | .ctl_name = NET_IPV4_VS_NAT_ICMP_SEND, |
| 1582 | .procname = "nat_icmp_send", |
| 1583 | .data = &sysctl_ip_vs_nat_icmp_send, |
| 1584 | .maxlen = sizeof(int), |
| 1585 | .mode = 0644, |
| 1586 | .proc_handler = &proc_dointvec, |
| 1587 | }, |
| 1588 | { .ctl_name = 0 } |
| 1589 | }; |
| 1590 | |
| 1591 | static ctl_table vs_table[] = { |
| 1592 | { |
| 1593 | .ctl_name = NET_IPV4_VS, |
| 1594 | .procname = "vs", |
| 1595 | .mode = 0555, |
| 1596 | .child = vs_vars |
| 1597 | }, |
| 1598 | { .ctl_name = 0 } |
| 1599 | }; |
| 1600 | |
David S. Miller | bf0ff9e | 2005-08-19 16:37:30 -0700 | [diff] [blame] | 1601 | static ctl_table ipvs_ipv4_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | { |
| 1603 | .ctl_name = NET_IPV4, |
| 1604 | .procname = "ipv4", |
| 1605 | .mode = 0555, |
| 1606 | .child = vs_table, |
| 1607 | }, |
| 1608 | { .ctl_name = 0 } |
| 1609 | }; |
| 1610 | |
| 1611 | static ctl_table vs_root_table[] = { |
| 1612 | { |
| 1613 | .ctl_name = CTL_NET, |
| 1614 | .procname = "net", |
| 1615 | .mode = 0555, |
David S. Miller | bf0ff9e | 2005-08-19 16:37:30 -0700 | [diff] [blame] | 1616 | .child = ipvs_ipv4_table, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | }, |
| 1618 | { .ctl_name = 0 } |
| 1619 | }; |
| 1620 | |
| 1621 | static struct ctl_table_header * sysctl_header; |
| 1622 | |
| 1623 | #ifdef CONFIG_PROC_FS |
| 1624 | |
| 1625 | struct ip_vs_iter { |
| 1626 | struct list_head *table; |
| 1627 | int bucket; |
| 1628 | }; |
| 1629 | |
| 1630 | /* |
| 1631 | * Write the contents of the VS rule table to a PROCfs file. |
| 1632 | * (It is kept just for backward compatibility) |
| 1633 | */ |
| 1634 | static inline const char *ip_vs_fwd_name(unsigned flags) |
| 1635 | { |
| 1636 | switch (flags & IP_VS_CONN_F_FWD_MASK) { |
| 1637 | case IP_VS_CONN_F_LOCALNODE: |
| 1638 | return "Local"; |
| 1639 | case IP_VS_CONN_F_TUNNEL: |
| 1640 | return "Tunnel"; |
| 1641 | case IP_VS_CONN_F_DROUTE: |
| 1642 | return "Route"; |
| 1643 | default: |
| 1644 | return "Masq"; |
| 1645 | } |
| 1646 | } |
| 1647 | |
| 1648 | |
| 1649 | /* Get the Nth entry in the two lists */ |
| 1650 | static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos) |
| 1651 | { |
| 1652 | struct ip_vs_iter *iter = seq->private; |
| 1653 | int idx; |
| 1654 | struct ip_vs_service *svc; |
| 1655 | |
| 1656 | /* look in hash by protocol */ |
| 1657 | for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 1658 | list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) { |
| 1659 | if (pos-- == 0){ |
| 1660 | iter->table = ip_vs_svc_table; |
| 1661 | iter->bucket = idx; |
| 1662 | return svc; |
| 1663 | } |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | /* keep looking in fwmark */ |
| 1668 | for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 1669 | list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) { |
| 1670 | if (pos-- == 0) { |
| 1671 | iter->table = ip_vs_svc_fwm_table; |
| 1672 | iter->bucket = idx; |
| 1673 | return svc; |
| 1674 | } |
| 1675 | } |
| 1676 | } |
| 1677 | |
| 1678 | return NULL; |
| 1679 | } |
| 1680 | |
| 1681 | static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos) |
| 1682 | { |
| 1683 | |
| 1684 | read_lock_bh(&__ip_vs_svc_lock); |
| 1685 | return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN; |
| 1686 | } |
| 1687 | |
| 1688 | |
| 1689 | static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1690 | { |
| 1691 | struct list_head *e; |
| 1692 | struct ip_vs_iter *iter; |
| 1693 | struct ip_vs_service *svc; |
| 1694 | |
| 1695 | ++*pos; |
| 1696 | if (v == SEQ_START_TOKEN) |
| 1697 | return ip_vs_info_array(seq,0); |
| 1698 | |
| 1699 | svc = v; |
| 1700 | iter = seq->private; |
| 1701 | |
| 1702 | if (iter->table == ip_vs_svc_table) { |
| 1703 | /* next service in table hashed by protocol */ |
| 1704 | if ((e = svc->s_list.next) != &ip_vs_svc_table[iter->bucket]) |
| 1705 | return list_entry(e, struct ip_vs_service, s_list); |
| 1706 | |
| 1707 | |
| 1708 | while (++iter->bucket < IP_VS_SVC_TAB_SIZE) { |
| 1709 | list_for_each_entry(svc,&ip_vs_svc_table[iter->bucket], |
| 1710 | s_list) { |
| 1711 | return svc; |
| 1712 | } |
| 1713 | } |
| 1714 | |
| 1715 | iter->table = ip_vs_svc_fwm_table; |
| 1716 | iter->bucket = -1; |
| 1717 | goto scan_fwmark; |
| 1718 | } |
| 1719 | |
| 1720 | /* next service in hashed by fwmark */ |
| 1721 | if ((e = svc->f_list.next) != &ip_vs_svc_fwm_table[iter->bucket]) |
| 1722 | return list_entry(e, struct ip_vs_service, f_list); |
| 1723 | |
| 1724 | scan_fwmark: |
| 1725 | while (++iter->bucket < IP_VS_SVC_TAB_SIZE) { |
| 1726 | list_for_each_entry(svc, &ip_vs_svc_fwm_table[iter->bucket], |
| 1727 | f_list) |
| 1728 | return svc; |
| 1729 | } |
| 1730 | |
| 1731 | return NULL; |
| 1732 | } |
| 1733 | |
| 1734 | static void ip_vs_info_seq_stop(struct seq_file *seq, void *v) |
| 1735 | { |
| 1736 | read_unlock_bh(&__ip_vs_svc_lock); |
| 1737 | } |
| 1738 | |
| 1739 | |
| 1740 | static int ip_vs_info_seq_show(struct seq_file *seq, void *v) |
| 1741 | { |
| 1742 | if (v == SEQ_START_TOKEN) { |
| 1743 | seq_printf(seq, |
| 1744 | "IP Virtual Server version %d.%d.%d (size=%d)\n", |
| 1745 | NVERSION(IP_VS_VERSION_CODE), IP_VS_CONN_TAB_SIZE); |
| 1746 | seq_puts(seq, |
| 1747 | "Prot LocalAddress:Port Scheduler Flags\n"); |
| 1748 | seq_puts(seq, |
| 1749 | " -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n"); |
| 1750 | } else { |
| 1751 | const struct ip_vs_service *svc = v; |
| 1752 | const struct ip_vs_iter *iter = seq->private; |
| 1753 | const struct ip_vs_dest *dest; |
| 1754 | |
| 1755 | if (iter->table == ip_vs_svc_table) |
| 1756 | seq_printf(seq, "%s %08X:%04X %s ", |
| 1757 | ip_vs_proto_name(svc->protocol), |
| 1758 | ntohl(svc->addr), |
| 1759 | ntohs(svc->port), |
| 1760 | svc->scheduler->name); |
| 1761 | else |
| 1762 | seq_printf(seq, "FWM %08X %s ", |
| 1763 | svc->fwmark, svc->scheduler->name); |
| 1764 | |
| 1765 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) |
| 1766 | seq_printf(seq, "persistent %d %08X\n", |
| 1767 | svc->timeout, |
| 1768 | ntohl(svc->netmask)); |
| 1769 | else |
| 1770 | seq_putc(seq, '\n'); |
| 1771 | |
| 1772 | list_for_each_entry(dest, &svc->destinations, n_list) { |
| 1773 | seq_printf(seq, |
| 1774 | " -> %08X:%04X %-7s %-6d %-10d %-10d\n", |
| 1775 | ntohl(dest->addr), ntohs(dest->port), |
| 1776 | ip_vs_fwd_name(atomic_read(&dest->conn_flags)), |
| 1777 | atomic_read(&dest->weight), |
| 1778 | atomic_read(&dest->activeconns), |
| 1779 | atomic_read(&dest->inactconns)); |
| 1780 | } |
| 1781 | } |
| 1782 | return 0; |
| 1783 | } |
| 1784 | |
| 1785 | static struct seq_operations ip_vs_info_seq_ops = { |
| 1786 | .start = ip_vs_info_seq_start, |
| 1787 | .next = ip_vs_info_seq_next, |
| 1788 | .stop = ip_vs_info_seq_stop, |
| 1789 | .show = ip_vs_info_seq_show, |
| 1790 | }; |
| 1791 | |
| 1792 | static int ip_vs_info_open(struct inode *inode, struct file *file) |
| 1793 | { |
| 1794 | struct seq_file *seq; |
| 1795 | int rc = -ENOMEM; |
| 1796 | struct ip_vs_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1797 | |
| 1798 | if (!s) |
| 1799 | goto out; |
| 1800 | |
| 1801 | rc = seq_open(file, &ip_vs_info_seq_ops); |
| 1802 | if (rc) |
| 1803 | goto out_kfree; |
| 1804 | |
| 1805 | seq = file->private_data; |
| 1806 | seq->private = s; |
| 1807 | memset(s, 0, sizeof(*s)); |
| 1808 | out: |
| 1809 | return rc; |
| 1810 | out_kfree: |
| 1811 | kfree(s); |
| 1812 | goto out; |
| 1813 | } |
| 1814 | |
| 1815 | static struct file_operations ip_vs_info_fops = { |
| 1816 | .owner = THIS_MODULE, |
| 1817 | .open = ip_vs_info_open, |
| 1818 | .read = seq_read, |
| 1819 | .llseek = seq_lseek, |
| 1820 | .release = seq_release_private, |
| 1821 | }; |
| 1822 | |
| 1823 | #endif |
| 1824 | |
| 1825 | struct ip_vs_stats ip_vs_stats; |
| 1826 | |
| 1827 | #ifdef CONFIG_PROC_FS |
| 1828 | static int ip_vs_stats_show(struct seq_file *seq, void *v) |
| 1829 | { |
| 1830 | |
| 1831 | /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */ |
| 1832 | seq_puts(seq, |
| 1833 | " Total Incoming Outgoing Incoming Outgoing\n"); |
| 1834 | seq_printf(seq, |
| 1835 | " Conns Packets Packets Bytes Bytes\n"); |
| 1836 | |
| 1837 | spin_lock_bh(&ip_vs_stats.lock); |
| 1838 | seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", ip_vs_stats.conns, |
| 1839 | ip_vs_stats.inpkts, ip_vs_stats.outpkts, |
| 1840 | (unsigned long long) ip_vs_stats.inbytes, |
| 1841 | (unsigned long long) ip_vs_stats.outbytes); |
| 1842 | |
| 1843 | /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */ |
| 1844 | seq_puts(seq, |
| 1845 | " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n"); |
| 1846 | seq_printf(seq,"%8X %8X %8X %16X %16X\n", |
| 1847 | ip_vs_stats.cps, |
| 1848 | ip_vs_stats.inpps, |
| 1849 | ip_vs_stats.outpps, |
| 1850 | ip_vs_stats.inbps, |
| 1851 | ip_vs_stats.outbps); |
| 1852 | spin_unlock_bh(&ip_vs_stats.lock); |
| 1853 | |
| 1854 | return 0; |
| 1855 | } |
| 1856 | |
| 1857 | static int ip_vs_stats_seq_open(struct inode *inode, struct file *file) |
| 1858 | { |
| 1859 | return single_open(file, ip_vs_stats_show, NULL); |
| 1860 | } |
| 1861 | |
| 1862 | static struct file_operations ip_vs_stats_fops = { |
| 1863 | .owner = THIS_MODULE, |
| 1864 | .open = ip_vs_stats_seq_open, |
| 1865 | .read = seq_read, |
| 1866 | .llseek = seq_lseek, |
| 1867 | .release = single_release, |
| 1868 | }; |
| 1869 | |
| 1870 | #endif |
| 1871 | |
| 1872 | /* |
| 1873 | * Set timeout values for tcp tcpfin udp in the timeout_table. |
| 1874 | */ |
| 1875 | static int ip_vs_set_timeout(struct ip_vs_timeout_user *u) |
| 1876 | { |
| 1877 | IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n", |
| 1878 | u->tcp_timeout, |
| 1879 | u->tcp_fin_timeout, |
| 1880 | u->udp_timeout); |
| 1881 | |
| 1882 | #ifdef CONFIG_IP_VS_PROTO_TCP |
| 1883 | if (u->tcp_timeout) { |
| 1884 | ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED] |
| 1885 | = u->tcp_timeout * HZ; |
| 1886 | } |
| 1887 | |
| 1888 | if (u->tcp_fin_timeout) { |
| 1889 | ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT] |
| 1890 | = u->tcp_fin_timeout * HZ; |
| 1891 | } |
| 1892 | #endif |
| 1893 | |
| 1894 | #ifdef CONFIG_IP_VS_PROTO_UDP |
| 1895 | if (u->udp_timeout) { |
| 1896 | ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL] |
| 1897 | = u->udp_timeout * HZ; |
| 1898 | } |
| 1899 | #endif |
| 1900 | return 0; |
| 1901 | } |
| 1902 | |
| 1903 | |
| 1904 | #define SET_CMDID(cmd) (cmd - IP_VS_BASE_CTL) |
| 1905 | #define SERVICE_ARG_LEN (sizeof(struct ip_vs_service_user)) |
| 1906 | #define SVCDEST_ARG_LEN (sizeof(struct ip_vs_service_user) + \ |
| 1907 | sizeof(struct ip_vs_dest_user)) |
| 1908 | #define TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user)) |
| 1909 | #define DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user)) |
| 1910 | #define MAX_ARG_LEN SVCDEST_ARG_LEN |
| 1911 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame^] | 1912 | static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | [SET_CMDID(IP_VS_SO_SET_ADD)] = SERVICE_ARG_LEN, |
| 1914 | [SET_CMDID(IP_VS_SO_SET_EDIT)] = SERVICE_ARG_LEN, |
| 1915 | [SET_CMDID(IP_VS_SO_SET_DEL)] = SERVICE_ARG_LEN, |
| 1916 | [SET_CMDID(IP_VS_SO_SET_FLUSH)] = 0, |
| 1917 | [SET_CMDID(IP_VS_SO_SET_ADDDEST)] = SVCDEST_ARG_LEN, |
| 1918 | [SET_CMDID(IP_VS_SO_SET_DELDEST)] = SVCDEST_ARG_LEN, |
| 1919 | [SET_CMDID(IP_VS_SO_SET_EDITDEST)] = SVCDEST_ARG_LEN, |
| 1920 | [SET_CMDID(IP_VS_SO_SET_TIMEOUT)] = TIMEOUT_ARG_LEN, |
| 1921 | [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)] = DAEMON_ARG_LEN, |
| 1922 | [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)] = DAEMON_ARG_LEN, |
| 1923 | [SET_CMDID(IP_VS_SO_SET_ZERO)] = SERVICE_ARG_LEN, |
| 1924 | }; |
| 1925 | |
| 1926 | static int |
| 1927 | do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) |
| 1928 | { |
| 1929 | int ret; |
| 1930 | unsigned char arg[MAX_ARG_LEN]; |
| 1931 | struct ip_vs_service_user *usvc; |
| 1932 | struct ip_vs_service *svc; |
| 1933 | struct ip_vs_dest_user *udest; |
| 1934 | |
| 1935 | if (!capable(CAP_NET_ADMIN)) |
| 1936 | return -EPERM; |
| 1937 | |
| 1938 | if (len != set_arglen[SET_CMDID(cmd)]) { |
| 1939 | IP_VS_ERR("set_ctl: len %u != %u\n", |
| 1940 | len, set_arglen[SET_CMDID(cmd)]); |
| 1941 | return -EINVAL; |
| 1942 | } |
| 1943 | |
| 1944 | if (copy_from_user(arg, user, len) != 0) |
| 1945 | return -EFAULT; |
| 1946 | |
| 1947 | /* increase the module use count */ |
| 1948 | ip_vs_use_count_inc(); |
| 1949 | |
| 1950 | if (down_interruptible(&__ip_vs_mutex)) { |
| 1951 | ret = -ERESTARTSYS; |
| 1952 | goto out_dec; |
| 1953 | } |
| 1954 | |
| 1955 | if (cmd == IP_VS_SO_SET_FLUSH) { |
| 1956 | /* Flush the virtual service */ |
| 1957 | ret = ip_vs_flush(); |
| 1958 | goto out_unlock; |
| 1959 | } else if (cmd == IP_VS_SO_SET_TIMEOUT) { |
| 1960 | /* Set timeout values for (tcp tcpfin udp) */ |
| 1961 | ret = ip_vs_set_timeout((struct ip_vs_timeout_user *)arg); |
| 1962 | goto out_unlock; |
| 1963 | } else if (cmd == IP_VS_SO_SET_STARTDAEMON) { |
| 1964 | struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg; |
| 1965 | ret = start_sync_thread(dm->state, dm->mcast_ifn, dm->syncid); |
| 1966 | goto out_unlock; |
| 1967 | } else if (cmd == IP_VS_SO_SET_STOPDAEMON) { |
| 1968 | struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg; |
| 1969 | ret = stop_sync_thread(dm->state); |
| 1970 | goto out_unlock; |
| 1971 | } |
| 1972 | |
| 1973 | usvc = (struct ip_vs_service_user *)arg; |
| 1974 | udest = (struct ip_vs_dest_user *)(usvc + 1); |
| 1975 | |
| 1976 | if (cmd == IP_VS_SO_SET_ZERO) { |
| 1977 | /* if no service address is set, zero counters in all */ |
| 1978 | if (!usvc->fwmark && !usvc->addr && !usvc->port) { |
| 1979 | ret = ip_vs_zero_all(); |
| 1980 | goto out_unlock; |
| 1981 | } |
| 1982 | } |
| 1983 | |
| 1984 | /* Check for valid protocol: TCP or UDP, even for fwmark!=0 */ |
| 1985 | if (usvc->protocol!=IPPROTO_TCP && usvc->protocol!=IPPROTO_UDP) { |
| 1986 | IP_VS_ERR("set_ctl: invalid protocol: %d %d.%d.%d.%d:%d %s\n", |
| 1987 | usvc->protocol, NIPQUAD(usvc->addr), |
| 1988 | ntohs(usvc->port), usvc->sched_name); |
| 1989 | ret = -EFAULT; |
| 1990 | goto out_unlock; |
| 1991 | } |
| 1992 | |
| 1993 | /* Lookup the exact service by <protocol, addr, port> or fwmark */ |
| 1994 | if (usvc->fwmark == 0) |
| 1995 | svc = __ip_vs_service_get(usvc->protocol, |
| 1996 | usvc->addr, usvc->port); |
| 1997 | else |
| 1998 | svc = __ip_vs_svc_fwm_get(usvc->fwmark); |
| 1999 | |
| 2000 | if (cmd != IP_VS_SO_SET_ADD |
| 2001 | && (svc == NULL || svc->protocol != usvc->protocol)) { |
| 2002 | ret = -ESRCH; |
| 2003 | goto out_unlock; |
| 2004 | } |
| 2005 | |
| 2006 | switch (cmd) { |
| 2007 | case IP_VS_SO_SET_ADD: |
| 2008 | if (svc != NULL) |
| 2009 | ret = -EEXIST; |
| 2010 | else |
| 2011 | ret = ip_vs_add_service(usvc, &svc); |
| 2012 | break; |
| 2013 | case IP_VS_SO_SET_EDIT: |
| 2014 | ret = ip_vs_edit_service(svc, usvc); |
| 2015 | break; |
| 2016 | case IP_VS_SO_SET_DEL: |
| 2017 | ret = ip_vs_del_service(svc); |
| 2018 | if (!ret) |
| 2019 | goto out_unlock; |
| 2020 | break; |
| 2021 | case IP_VS_SO_SET_ZERO: |
| 2022 | ret = ip_vs_zero_service(svc); |
| 2023 | break; |
| 2024 | case IP_VS_SO_SET_ADDDEST: |
| 2025 | ret = ip_vs_add_dest(svc, udest); |
| 2026 | break; |
| 2027 | case IP_VS_SO_SET_EDITDEST: |
| 2028 | ret = ip_vs_edit_dest(svc, udest); |
| 2029 | break; |
| 2030 | case IP_VS_SO_SET_DELDEST: |
| 2031 | ret = ip_vs_del_dest(svc, udest); |
| 2032 | break; |
| 2033 | default: |
| 2034 | ret = -EINVAL; |
| 2035 | } |
| 2036 | |
| 2037 | if (svc) |
| 2038 | ip_vs_service_put(svc); |
| 2039 | |
| 2040 | out_unlock: |
| 2041 | up(&__ip_vs_mutex); |
| 2042 | out_dec: |
| 2043 | /* decrease the module use count */ |
| 2044 | ip_vs_use_count_dec(); |
| 2045 | |
| 2046 | return ret; |
| 2047 | } |
| 2048 | |
| 2049 | |
| 2050 | static void |
| 2051 | ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src) |
| 2052 | { |
| 2053 | spin_lock_bh(&src->lock); |
| 2054 | memcpy(dst, src, (char*)&src->lock - (char*)src); |
| 2055 | spin_unlock_bh(&src->lock); |
| 2056 | } |
| 2057 | |
| 2058 | static void |
| 2059 | ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src) |
| 2060 | { |
| 2061 | dst->protocol = src->protocol; |
| 2062 | dst->addr = src->addr; |
| 2063 | dst->port = src->port; |
| 2064 | dst->fwmark = src->fwmark; |
pageexec | 4da62fc | 2005-06-26 16:00:19 -0700 | [diff] [blame] | 2065 | strlcpy(dst->sched_name, src->scheduler->name, sizeof(dst->sched_name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | dst->flags = src->flags; |
| 2067 | dst->timeout = src->timeout / HZ; |
| 2068 | dst->netmask = src->netmask; |
| 2069 | dst->num_dests = src->num_dests; |
| 2070 | ip_vs_copy_stats(&dst->stats, &src->stats); |
| 2071 | } |
| 2072 | |
| 2073 | static inline int |
| 2074 | __ip_vs_get_service_entries(const struct ip_vs_get_services *get, |
| 2075 | struct ip_vs_get_services __user *uptr) |
| 2076 | { |
| 2077 | int idx, count=0; |
| 2078 | struct ip_vs_service *svc; |
| 2079 | struct ip_vs_service_entry entry; |
| 2080 | int ret = 0; |
| 2081 | |
| 2082 | for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 2083 | list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) { |
| 2084 | if (count >= get->num_services) |
| 2085 | goto out; |
pageexec | 4da62fc | 2005-06-26 16:00:19 -0700 | [diff] [blame] | 2086 | memset(&entry, 0, sizeof(entry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | ip_vs_copy_service(&entry, svc); |
| 2088 | if (copy_to_user(&uptr->entrytable[count], |
| 2089 | &entry, sizeof(entry))) { |
| 2090 | ret = -EFAULT; |
| 2091 | goto out; |
| 2092 | } |
| 2093 | count++; |
| 2094 | } |
| 2095 | } |
| 2096 | |
| 2097 | for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 2098 | list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) { |
| 2099 | if (count >= get->num_services) |
| 2100 | goto out; |
pageexec | 4da62fc | 2005-06-26 16:00:19 -0700 | [diff] [blame] | 2101 | memset(&entry, 0, sizeof(entry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | ip_vs_copy_service(&entry, svc); |
| 2103 | if (copy_to_user(&uptr->entrytable[count], |
| 2104 | &entry, sizeof(entry))) { |
| 2105 | ret = -EFAULT; |
| 2106 | goto out; |
| 2107 | } |
| 2108 | count++; |
| 2109 | } |
| 2110 | } |
| 2111 | out: |
| 2112 | return ret; |
| 2113 | } |
| 2114 | |
| 2115 | static inline int |
| 2116 | __ip_vs_get_dest_entries(const struct ip_vs_get_dests *get, |
| 2117 | struct ip_vs_get_dests __user *uptr) |
| 2118 | { |
| 2119 | struct ip_vs_service *svc; |
| 2120 | int ret = 0; |
| 2121 | |
| 2122 | if (get->fwmark) |
| 2123 | svc = __ip_vs_svc_fwm_get(get->fwmark); |
| 2124 | else |
| 2125 | svc = __ip_vs_service_get(get->protocol, |
| 2126 | get->addr, get->port); |
| 2127 | if (svc) { |
| 2128 | int count = 0; |
| 2129 | struct ip_vs_dest *dest; |
| 2130 | struct ip_vs_dest_entry entry; |
| 2131 | |
| 2132 | list_for_each_entry(dest, &svc->destinations, n_list) { |
| 2133 | if (count >= get->num_dests) |
| 2134 | break; |
| 2135 | |
| 2136 | entry.addr = dest->addr; |
| 2137 | entry.port = dest->port; |
| 2138 | entry.conn_flags = atomic_read(&dest->conn_flags); |
| 2139 | entry.weight = atomic_read(&dest->weight); |
| 2140 | entry.u_threshold = dest->u_threshold; |
| 2141 | entry.l_threshold = dest->l_threshold; |
| 2142 | entry.activeconns = atomic_read(&dest->activeconns); |
| 2143 | entry.inactconns = atomic_read(&dest->inactconns); |
| 2144 | entry.persistconns = atomic_read(&dest->persistconns); |
| 2145 | ip_vs_copy_stats(&entry.stats, &dest->stats); |
| 2146 | if (copy_to_user(&uptr->entrytable[count], |
| 2147 | &entry, sizeof(entry))) { |
| 2148 | ret = -EFAULT; |
| 2149 | break; |
| 2150 | } |
| 2151 | count++; |
| 2152 | } |
| 2153 | ip_vs_service_put(svc); |
| 2154 | } else |
| 2155 | ret = -ESRCH; |
| 2156 | return ret; |
| 2157 | } |
| 2158 | |
| 2159 | static inline void |
| 2160 | __ip_vs_get_timeouts(struct ip_vs_timeout_user *u) |
| 2161 | { |
| 2162 | #ifdef CONFIG_IP_VS_PROTO_TCP |
| 2163 | u->tcp_timeout = |
| 2164 | ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ; |
| 2165 | u->tcp_fin_timeout = |
| 2166 | ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ; |
| 2167 | #endif |
| 2168 | #ifdef CONFIG_IP_VS_PROTO_UDP |
| 2169 | u->udp_timeout = |
| 2170 | ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL] / HZ; |
| 2171 | #endif |
| 2172 | } |
| 2173 | |
| 2174 | |
| 2175 | #define GET_CMDID(cmd) (cmd - IP_VS_BASE_CTL) |
| 2176 | #define GET_INFO_ARG_LEN (sizeof(struct ip_vs_getinfo)) |
| 2177 | #define GET_SERVICES_ARG_LEN (sizeof(struct ip_vs_get_services)) |
| 2178 | #define GET_SERVICE_ARG_LEN (sizeof(struct ip_vs_service_entry)) |
| 2179 | #define GET_DESTS_ARG_LEN (sizeof(struct ip_vs_get_dests)) |
| 2180 | #define GET_TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user)) |
| 2181 | #define GET_DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user) * 2) |
| 2182 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame^] | 2183 | static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | [GET_CMDID(IP_VS_SO_GET_VERSION)] = 64, |
| 2185 | [GET_CMDID(IP_VS_SO_GET_INFO)] = GET_INFO_ARG_LEN, |
| 2186 | [GET_CMDID(IP_VS_SO_GET_SERVICES)] = GET_SERVICES_ARG_LEN, |
| 2187 | [GET_CMDID(IP_VS_SO_GET_SERVICE)] = GET_SERVICE_ARG_LEN, |
| 2188 | [GET_CMDID(IP_VS_SO_GET_DESTS)] = GET_DESTS_ARG_LEN, |
| 2189 | [GET_CMDID(IP_VS_SO_GET_TIMEOUT)] = GET_TIMEOUT_ARG_LEN, |
| 2190 | [GET_CMDID(IP_VS_SO_GET_DAEMON)] = GET_DAEMON_ARG_LEN, |
| 2191 | }; |
| 2192 | |
| 2193 | static int |
| 2194 | do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) |
| 2195 | { |
| 2196 | unsigned char arg[128]; |
| 2197 | int ret = 0; |
| 2198 | |
| 2199 | if (!capable(CAP_NET_ADMIN)) |
| 2200 | return -EPERM; |
| 2201 | |
| 2202 | if (*len < get_arglen[GET_CMDID(cmd)]) { |
| 2203 | IP_VS_ERR("get_ctl: len %u < %u\n", |
| 2204 | *len, get_arglen[GET_CMDID(cmd)]); |
| 2205 | return -EINVAL; |
| 2206 | } |
| 2207 | |
| 2208 | if (copy_from_user(arg, user, get_arglen[GET_CMDID(cmd)]) != 0) |
| 2209 | return -EFAULT; |
| 2210 | |
| 2211 | if (down_interruptible(&__ip_vs_mutex)) |
| 2212 | return -ERESTARTSYS; |
| 2213 | |
| 2214 | switch (cmd) { |
| 2215 | case IP_VS_SO_GET_VERSION: |
| 2216 | { |
| 2217 | char buf[64]; |
| 2218 | |
| 2219 | sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)", |
| 2220 | NVERSION(IP_VS_VERSION_CODE), IP_VS_CONN_TAB_SIZE); |
| 2221 | if (copy_to_user(user, buf, strlen(buf)+1) != 0) { |
| 2222 | ret = -EFAULT; |
| 2223 | goto out; |
| 2224 | } |
| 2225 | *len = strlen(buf)+1; |
| 2226 | } |
| 2227 | break; |
| 2228 | |
| 2229 | case IP_VS_SO_GET_INFO: |
| 2230 | { |
| 2231 | struct ip_vs_getinfo info; |
| 2232 | info.version = IP_VS_VERSION_CODE; |
| 2233 | info.size = IP_VS_CONN_TAB_SIZE; |
| 2234 | info.num_services = ip_vs_num_services; |
| 2235 | if (copy_to_user(user, &info, sizeof(info)) != 0) |
| 2236 | ret = -EFAULT; |
| 2237 | } |
| 2238 | break; |
| 2239 | |
| 2240 | case IP_VS_SO_GET_SERVICES: |
| 2241 | { |
| 2242 | struct ip_vs_get_services *get; |
| 2243 | int size; |
| 2244 | |
| 2245 | get = (struct ip_vs_get_services *)arg; |
| 2246 | size = sizeof(*get) + |
| 2247 | sizeof(struct ip_vs_service_entry) * get->num_services; |
| 2248 | if (*len != size) { |
| 2249 | IP_VS_ERR("length: %u != %u\n", *len, size); |
| 2250 | ret = -EINVAL; |
| 2251 | goto out; |
| 2252 | } |
| 2253 | ret = __ip_vs_get_service_entries(get, user); |
| 2254 | } |
| 2255 | break; |
| 2256 | |
| 2257 | case IP_VS_SO_GET_SERVICE: |
| 2258 | { |
| 2259 | struct ip_vs_service_entry *entry; |
| 2260 | struct ip_vs_service *svc; |
| 2261 | |
| 2262 | entry = (struct ip_vs_service_entry *)arg; |
| 2263 | if (entry->fwmark) |
| 2264 | svc = __ip_vs_svc_fwm_get(entry->fwmark); |
| 2265 | else |
| 2266 | svc = __ip_vs_service_get(entry->protocol, |
| 2267 | entry->addr, entry->port); |
| 2268 | if (svc) { |
| 2269 | ip_vs_copy_service(entry, svc); |
| 2270 | if (copy_to_user(user, entry, sizeof(*entry)) != 0) |
| 2271 | ret = -EFAULT; |
| 2272 | ip_vs_service_put(svc); |
| 2273 | } else |
| 2274 | ret = -ESRCH; |
| 2275 | } |
| 2276 | break; |
| 2277 | |
| 2278 | case IP_VS_SO_GET_DESTS: |
| 2279 | { |
| 2280 | struct ip_vs_get_dests *get; |
| 2281 | int size; |
| 2282 | |
| 2283 | get = (struct ip_vs_get_dests *)arg; |
| 2284 | size = sizeof(*get) + |
| 2285 | sizeof(struct ip_vs_dest_entry) * get->num_dests; |
| 2286 | if (*len != size) { |
| 2287 | IP_VS_ERR("length: %u != %u\n", *len, size); |
| 2288 | ret = -EINVAL; |
| 2289 | goto out; |
| 2290 | } |
| 2291 | ret = __ip_vs_get_dest_entries(get, user); |
| 2292 | } |
| 2293 | break; |
| 2294 | |
| 2295 | case IP_VS_SO_GET_TIMEOUT: |
| 2296 | { |
| 2297 | struct ip_vs_timeout_user t; |
| 2298 | |
| 2299 | __ip_vs_get_timeouts(&t); |
| 2300 | if (copy_to_user(user, &t, sizeof(t)) != 0) |
| 2301 | ret = -EFAULT; |
| 2302 | } |
| 2303 | break; |
| 2304 | |
| 2305 | case IP_VS_SO_GET_DAEMON: |
| 2306 | { |
| 2307 | struct ip_vs_daemon_user d[2]; |
| 2308 | |
| 2309 | memset(&d, 0, sizeof(d)); |
| 2310 | if (ip_vs_sync_state & IP_VS_STATE_MASTER) { |
| 2311 | d[0].state = IP_VS_STATE_MASTER; |
pageexec | 4da62fc | 2005-06-26 16:00:19 -0700 | [diff] [blame] | 2312 | strlcpy(d[0].mcast_ifn, ip_vs_master_mcast_ifn, sizeof(d[0].mcast_ifn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | d[0].syncid = ip_vs_master_syncid; |
| 2314 | } |
| 2315 | if (ip_vs_sync_state & IP_VS_STATE_BACKUP) { |
| 2316 | d[1].state = IP_VS_STATE_BACKUP; |
pageexec | 4da62fc | 2005-06-26 16:00:19 -0700 | [diff] [blame] | 2317 | strlcpy(d[1].mcast_ifn, ip_vs_backup_mcast_ifn, sizeof(d[1].mcast_ifn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | d[1].syncid = ip_vs_backup_syncid; |
| 2319 | } |
| 2320 | if (copy_to_user(user, &d, sizeof(d)) != 0) |
| 2321 | ret = -EFAULT; |
| 2322 | } |
| 2323 | break; |
| 2324 | |
| 2325 | default: |
| 2326 | ret = -EINVAL; |
| 2327 | } |
| 2328 | |
| 2329 | out: |
| 2330 | up(&__ip_vs_mutex); |
| 2331 | return ret; |
| 2332 | } |
| 2333 | |
| 2334 | |
| 2335 | static struct nf_sockopt_ops ip_vs_sockopts = { |
| 2336 | .pf = PF_INET, |
| 2337 | .set_optmin = IP_VS_BASE_CTL, |
| 2338 | .set_optmax = IP_VS_SO_SET_MAX+1, |
| 2339 | .set = do_ip_vs_set_ctl, |
| 2340 | .get_optmin = IP_VS_BASE_CTL, |
| 2341 | .get_optmax = IP_VS_SO_GET_MAX+1, |
| 2342 | .get = do_ip_vs_get_ctl, |
| 2343 | }; |
| 2344 | |
| 2345 | |
| 2346 | int ip_vs_control_init(void) |
| 2347 | { |
| 2348 | int ret; |
| 2349 | int idx; |
| 2350 | |
| 2351 | EnterFunction(2); |
| 2352 | |
| 2353 | ret = nf_register_sockopt(&ip_vs_sockopts); |
| 2354 | if (ret) { |
| 2355 | IP_VS_ERR("cannot register sockopt.\n"); |
| 2356 | return ret; |
| 2357 | } |
| 2358 | |
| 2359 | proc_net_fops_create("ip_vs", 0, &ip_vs_info_fops); |
| 2360 | proc_net_fops_create("ip_vs_stats",0, &ip_vs_stats_fops); |
| 2361 | |
| 2362 | sysctl_header = register_sysctl_table(vs_root_table, 0); |
| 2363 | |
| 2364 | /* Initialize ip_vs_svc_table, ip_vs_svc_fwm_table, ip_vs_rtable */ |
| 2365 | for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) { |
| 2366 | INIT_LIST_HEAD(&ip_vs_svc_table[idx]); |
| 2367 | INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]); |
| 2368 | } |
| 2369 | for(idx = 0; idx < IP_VS_RTAB_SIZE; idx++) { |
| 2370 | INIT_LIST_HEAD(&ip_vs_rtable[idx]); |
| 2371 | } |
| 2372 | |
| 2373 | memset(&ip_vs_stats, 0, sizeof(ip_vs_stats)); |
| 2374 | spin_lock_init(&ip_vs_stats.lock); |
| 2375 | ip_vs_new_estimator(&ip_vs_stats); |
| 2376 | |
| 2377 | /* Hook the defense timer */ |
| 2378 | schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD); |
| 2379 | |
| 2380 | LeaveFunction(2); |
| 2381 | return 0; |
| 2382 | } |
| 2383 | |
| 2384 | |
| 2385 | void ip_vs_control_cleanup(void) |
| 2386 | { |
| 2387 | EnterFunction(2); |
| 2388 | ip_vs_trash_cleanup(); |
| 2389 | cancel_rearming_delayed_work(&defense_work); |
| 2390 | ip_vs_kill_estimator(&ip_vs_stats); |
| 2391 | unregister_sysctl_table(sysctl_header); |
| 2392 | proc_net_remove("ip_vs_stats"); |
| 2393 | proc_net_remove("ip_vs"); |
| 2394 | nf_unregister_sockopt(&ip_vs_sockopts); |
| 2395 | LeaveFunction(2); |
| 2396 | } |