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 1, is capable of handling both version 0 and 1 messages. 9 * Version 0 is the plain old format. 10 * Note Version 0 receivers will just drop Ver 1 messages. 11 * Version 1 is capable of handle IPv6, Persistence data, 12 * time-outs, and firewall marks. 13 * In ver.1 "ip_vs_sync_conn_options" will be sent in netw. order. 14 * Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0 15 * 16 * Definitions Message: is a complete datagram 17 * Sync_conn: is a part of a Message 18 * Param Data is an option to a Sync_conn. 19 * 20 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> 21 * 22 * ip_vs_sync: sync connection info from master load balancer to backups 23 * through multicast 24 * 25 * Changes: 26 * Alexandre Cassen : Added master & backup support at a time. 27 * Alexandre Cassen : Added SyncID support for incoming sync 28 * messages filtering. 29 * Justin Ossevoort : Fix endian problem on sync message size. 30 * Hans Schillstrom : Added Version 1: i.e. IPv6, 31 * Persistence support, fwmark and time-out. 32 */ 33 34 #define KMSG_COMPONENT "IPVS" 35 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 36 37 #include <linux/module.h> 38 #include <linux/slab.h> 39 #include <linux/inetdevice.h> 40 #include <linux/net.h> 41 #include <linux/completion.h> 42 #include <linux/delay.h> 43 #include <linux/skbuff.h> 44 #include <linux/in.h> 45 #include <linux/igmp.h> /* for ip_mc_join_group */ 46 #include <linux/udp.h> 47 #include <linux/err.h> 48 #include <linux/kthread.h> 49 #include <linux/wait.h> 50 #include <linux/kernel.h> 51 52 #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */ 53 54 #include <net/ip.h> 55 #include <net/sock.h> 56 57 #include <net/ip_vs.h> 58 59 #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */ 60 #define IP_VS_SYNC_PORT 8848 /* multicast port */ 61 62 #define SYNC_PROTO_VER 1 /* Protocol version in header */ 63 64 static struct lock_class_key __ipvs_sync_key; 65 /* 66 * IPVS sync connection entry 67 * Version 0, i.e. original version. 68 */ 69 struct ip_vs_sync_conn_v0 { 70 __u8 reserved; 71 72 /* Protocol, addresses and port numbers */ 73 __u8 protocol; /* Which protocol (TCP/UDP) */ 74 __be16 cport; 75 __be16 vport; 76 __be16 dport; 77 __be32 caddr; /* client address */ 78 __be32 vaddr; /* virtual address */ 79 __be32 daddr; /* destination address */ 80 81 /* Flags and state transition */ 82 __be16 flags; /* status flags */ 83 __be16 state; /* state info */ 84 85 /* The sequence options start here */ 86 }; 87 88 struct ip_vs_sync_conn_options { 89 struct ip_vs_seq in_seq; /* incoming seq. struct */ 90 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 91 }; 92 93 /* 94 Sync Connection format (sync_conn) 95 96 0 1 2 3 97 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 98 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 99 | Type | Protocol | Ver. | Size | 100 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 101 | Flags | 102 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 103 | State | cport | 104 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 105 | vport | dport | 106 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 107 | fwmark | 108 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 109 | timeout (in sec.) | 110 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 111 | ... | 112 | IP-Addresses (v4 or v6) | 113 | ... | 114 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 115 Optional Parameters. 116 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 117 | Param. Type | Param. Length | Param. data | 118 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 119 | ... | 120 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 121 | | Param Type | Param. Length | 122 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 123 | Param data | 124 | Last Param data should be padded for 32 bit alignment | 125 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 126 */ 127 128 /* 129 * Type 0, IPv4 sync connection format 130 */ 131 struct ip_vs_sync_v4 { 132 __u8 type; 133 __u8 protocol; /* Which protocol (TCP/UDP) */ 134 __be16 ver_size; /* Version msb 4 bits */ 135 /* Flags and state transition */ 136 __be32 flags; /* status flags */ 137 __be16 state; /* state info */ 138 /* Protocol, addresses and port numbers */ 139 __be16 cport; 140 __be16 vport; 141 __be16 dport; 142 __be32 fwmark; /* Firewall mark from skb */ 143 __be32 timeout; /* cp timeout */ 144 __be32 caddr; /* client address */ 145 __be32 vaddr; /* virtual address */ 146 __be32 daddr; /* destination address */ 147 /* The sequence options start here */ 148 /* PE data padded to 32bit alignment after seq. options */ 149 }; 150 /* 151 * Type 2 messages IPv6 152 */ 153 struct ip_vs_sync_v6 { 154 __u8 type; 155 __u8 protocol; /* Which protocol (TCP/UDP) */ 156 __be16 ver_size; /* Version msb 4 bits */ 157 /* Flags and state transition */ 158 __be32 flags; /* status flags */ 159 __be16 state; /* state info */ 160 /* Protocol, addresses and port numbers */ 161 __be16 cport; 162 __be16 vport; 163 __be16 dport; 164 __be32 fwmark; /* Firewall mark from skb */ 165 __be32 timeout; /* cp timeout */ 166 struct in6_addr caddr; /* client address */ 167 struct in6_addr vaddr; /* virtual address */ 168 struct in6_addr daddr; /* destination address */ 169 /* The sequence options start here */ 170 /* PE data padded to 32bit alignment after seq. options */ 171 }; 172 173 union ip_vs_sync_conn { 174 struct ip_vs_sync_v4 v4; 175 struct ip_vs_sync_v6 v6; 176 }; 177 178 /* Bits in Type field in above */ 179 #define STYPE_INET6 0 180 #define STYPE_F_INET6 (1 << STYPE_INET6) 181 182 #define SVER_SHIFT 12 /* Shift to get version */ 183 #define SVER_MASK 0x0fff /* Mask to strip version */ 184 185 #define IPVS_OPT_SEQ_DATA 1 186 #define IPVS_OPT_PE_DATA 2 187 #define IPVS_OPT_PE_NAME 3 188 #define IPVS_OPT_PARAM 7 189 190 #define IPVS_OPT_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1)) 191 #define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA-1)) 192 #define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1)) 193 #define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1)) 194 195 struct ip_vs_sync_thread_data { 196 struct net *net; 197 struct socket *sock; 198 char *buf; 199 int id; 200 }; 201 202 /* Version 0 definition of packet sizes */ 203 #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0)) 204 #define FULL_CONN_SIZE \ 205 (sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options)) 206 207 208 /* 209 The master mulitcasts messages (Datagrams) to the backup load balancers 210 in the following format. 211 212 Version 1: 213 Note, first byte should be Zero, so ver 0 receivers will drop the packet. 214 215 0 1 2 3 216 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 217 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 218 | 0 | SyncID | Size | 219 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 220 | Count Conns | Version | Reserved, set to Zero | 221 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 222 | | 223 | IPVS Sync Connection (1) | 224 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 225 | . | 226 ~ . ~ 227 | . | 228 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 229 | | 230 | IPVS Sync Connection (n) | 231 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 232 233 Version 0 Header 234 0 1 2 3 235 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 236 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 237 | Count Conns | SyncID | Size | 238 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 239 | IPVS Sync Connection (1) | 240 */ 241 242 #define SYNC_MESG_HEADER_LEN 4 243 #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */ 244 245 /* Version 0 header */ 246 struct ip_vs_sync_mesg_v0 { 247 __u8 nr_conns; 248 __u8 syncid; 249 __be16 size; 250 251 /* ip_vs_sync_conn entries start here */ 252 }; 253 254 /* Version 1 header */ 255 struct ip_vs_sync_mesg { 256 __u8 reserved; /* must be zero */ 257 __u8 syncid; 258 __be16 size; 259 __u8 nr_conns; 260 __s8 version; /* SYNC_PROTO_VER */ 261 __u16 spare; 262 /* ip_vs_sync_conn entries start here */ 263 }; 264 265 struct ip_vs_sync_buff { 266 struct list_head list; 267 unsigned long firstuse; 268 269 /* pointers for the message data */ 270 struct ip_vs_sync_mesg *mesg; 271 unsigned char *head; 272 unsigned char *end; 273 }; 274 275 /* 276 * Copy of struct ip_vs_seq 277 * From unaligned network order to aligned host order 278 */ 279 static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho) 280 { 281 ho->init_seq = get_unaligned_be32(&no->init_seq); 282 ho->delta = get_unaligned_be32(&no->delta); 283 ho->previous_delta = get_unaligned_be32(&no->previous_delta); 284 } 285 286 /* 287 * Copy of struct ip_vs_seq 288 * From Aligned host order to unaligned network order 289 */ 290 static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no) 291 { 292 put_unaligned_be32(ho->init_seq, &no->init_seq); 293 put_unaligned_be32(ho->delta, &no->delta); 294 put_unaligned_be32(ho->previous_delta, &no->previous_delta); 295 } 296 297 static inline struct ip_vs_sync_buff * 298 sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms) 299 { 300 struct ip_vs_sync_buff *sb; 301 302 spin_lock_bh(&ipvs->sync_lock); 303 if (list_empty(&ms->sync_queue)) { 304 sb = NULL; 305 __set_current_state(TASK_INTERRUPTIBLE); 306 } else { 307 sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff, 308 list); 309 list_del(&sb->list); 310 ms->sync_queue_len--; 311 if (!ms->sync_queue_len) 312 ms->sync_queue_delay = 0; 313 } 314 spin_unlock_bh(&ipvs->sync_lock); 315 316 return sb; 317 } 318 319 /* 320 * Create a new sync buffer for Version 1 proto. 321 */ 322 static inline struct ip_vs_sync_buff * 323 ip_vs_sync_buff_create(struct netns_ipvs *ipvs) 324 { 325 struct ip_vs_sync_buff *sb; 326 327 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC))) 328 return NULL; 329 330 sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC); 331 if (!sb->mesg) { 332 kfree(sb); 333 return NULL; 334 } 335 sb->mesg->reserved = 0; /* old nr_conns i.e. must be zero now */ 336 sb->mesg->version = SYNC_PROTO_VER; 337 sb->mesg->syncid = ipvs->master_syncid; 338 sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg)); 339 sb->mesg->nr_conns = 0; 340 sb->mesg->spare = 0; 341 sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg); 342 sb->end = (unsigned char *)sb->mesg + ipvs->send_mesg_maxlen; 343 344 sb->firstuse = jiffies; 345 return sb; 346 } 347 348 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb) 349 { 350 kfree(sb->mesg); 351 kfree(sb); 352 } 353 354 static inline void sb_queue_tail(struct netns_ipvs *ipvs, 355 struct ipvs_master_sync_state *ms) 356 { 357 struct ip_vs_sync_buff *sb = ms->sync_buff; 358 359 spin_lock(&ipvs->sync_lock); 360 if (ipvs->sync_state & IP_VS_STATE_MASTER && 361 ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) { 362 if (!ms->sync_queue_len) 363 schedule_delayed_work(&ms->master_wakeup_work, 364 max(IPVS_SYNC_SEND_DELAY, 1)); 365 ms->sync_queue_len++; 366 list_add_tail(&sb->list, &ms->sync_queue); 367 if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE) 368 wake_up_process(ms->master_thread); 369 } else 370 ip_vs_sync_buff_release(sb); 371 spin_unlock(&ipvs->sync_lock); 372 } 373 374 /* 375 * Get the current sync buffer if it has been created for more 376 * than the specified time or the specified time is zero. 377 */ 378 static inline struct ip_vs_sync_buff * 379 get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms, 380 unsigned long time) 381 { 382 struct ip_vs_sync_buff *sb; 383 384 spin_lock_bh(&ipvs->sync_buff_lock); 385 sb = ms->sync_buff; 386 if (sb && time_after_eq(jiffies - sb->firstuse, time)) { 387 ms->sync_buff = NULL; 388 __set_current_state(TASK_RUNNING); 389 } else 390 sb = NULL; 391 spin_unlock_bh(&ipvs->sync_buff_lock); 392 return sb; 393 } 394 395 static inline int 396 select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp) 397 { 398 return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask; 399 } 400 401 /* 402 * Create a new sync buffer for Version 0 proto. 403 */ 404 static inline struct ip_vs_sync_buff * 405 ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs) 406 { 407 struct ip_vs_sync_buff *sb; 408 struct ip_vs_sync_mesg_v0 *mesg; 409 410 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC))) 411 return NULL; 412 413 sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC); 414 if (!sb->mesg) { 415 kfree(sb); 416 return NULL; 417 } 418 mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg; 419 mesg->nr_conns = 0; 420 mesg->syncid = ipvs->master_syncid; 421 mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0)); 422 sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0); 423 sb->end = (unsigned char *)mesg + ipvs->send_mesg_maxlen; 424 sb->firstuse = jiffies; 425 return sb; 426 } 427 428 /* Check if connection is controlled by persistence */ 429 static inline bool in_persistence(struct ip_vs_conn *cp) 430 { 431 for (cp = cp->control; cp; cp = cp->control) { 432 if (cp->flags & IP_VS_CONN_F_TEMPLATE) 433 return true; 434 } 435 return false; 436 } 437 438 /* Check if conn should be synced. 439 * pkts: conn packets, use sysctl_sync_threshold to avoid packet check 440 * - (1) sync_refresh_period: reduce sync rate. Additionally, retry 441 * sync_retries times with period of sync_refresh_period/8 442 * - (2) if both sync_refresh_period and sync_period are 0 send sync only 443 * for state changes or only once when pkts matches sync_threshold 444 * - (3) templates: rate can be reduced only with sync_refresh_period or 445 * with (2) 446 */ 447 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs, 448 struct ip_vs_conn *cp, int pkts) 449 { 450 unsigned long orig = ACCESS_ONCE(cp->sync_endtime); 451 unsigned long now = jiffies; 452 unsigned long n = (now + cp->timeout) & ~3UL; 453 unsigned int sync_refresh_period; 454 int sync_period; 455 int force; 456 457 /* Check if we sync in current state */ 458 if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE)) 459 force = 0; 460 else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp))) 461 return 0; 462 else if (likely(cp->protocol == IPPROTO_TCP)) { 463 if (!((1 << cp->state) & 464 ((1 << IP_VS_TCP_S_ESTABLISHED) | 465 (1 << IP_VS_TCP_S_FIN_WAIT) | 466 (1 << IP_VS_TCP_S_CLOSE) | 467 (1 << IP_VS_TCP_S_CLOSE_WAIT) | 468 (1 << IP_VS_TCP_S_TIME_WAIT)))) 469 return 0; 470 force = cp->state != cp->old_state; 471 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED) 472 goto set; 473 } else if (unlikely(cp->protocol == IPPROTO_SCTP)) { 474 if (!((1 << cp->state) & 475 ((1 << IP_VS_SCTP_S_ESTABLISHED) | 476 (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) | 477 (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) | 478 (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) | 479 (1 << IP_VS_SCTP_S_CLOSED)))) 480 return 0; 481 force = cp->state != cp->old_state; 482 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED) 483 goto set; 484 } else { 485 /* UDP or another protocol with single state */ 486 force = 0; 487 } 488 489 sync_refresh_period = sysctl_sync_refresh_period(ipvs); 490 if (sync_refresh_period > 0) { 491 long diff = n - orig; 492 long min_diff = max(cp->timeout >> 1, 10UL * HZ); 493 494 /* Avoid sync if difference is below sync_refresh_period 495 * and below the half timeout. 496 */ 497 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) { 498 int retries = orig & 3; 499 500 if (retries >= sysctl_sync_retries(ipvs)) 501 return 0; 502 if (time_before(now, orig - cp->timeout + 503 (sync_refresh_period >> 3))) 504 return 0; 505 n |= retries + 1; 506 } 507 } 508 sync_period = sysctl_sync_period(ipvs); 509 if (sync_period > 0) { 510 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) && 511 pkts % sync_period != sysctl_sync_threshold(ipvs)) 512 return 0; 513 } else if (sync_refresh_period <= 0 && 514 pkts != sysctl_sync_threshold(ipvs)) 515 return 0; 516 517 set: 518 cp->old_state = cp->state; 519 n = cmpxchg(&cp->sync_endtime, orig, n); 520 return n == orig || force; 521 } 522 523 /* 524 * Version 0 , could be switched in by sys_ctl. 525 * Add an ip_vs_conn information into the current sync_buff. 526 */ 527 static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp, 528 int pkts) 529 { 530 struct netns_ipvs *ipvs = net_ipvs(net); 531 struct ip_vs_sync_mesg_v0 *m; 532 struct ip_vs_sync_conn_v0 *s; 533 struct ip_vs_sync_buff *buff; 534 struct ipvs_master_sync_state *ms; 535 int id; 536 int len; 537 538 if (unlikely(cp->af != AF_INET)) 539 return; 540 /* Do not sync ONE PACKET */ 541 if (cp->flags & IP_VS_CONN_F_ONE_PACKET) 542 return; 543 544 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts)) 545 return; 546 547 spin_lock_bh(&ipvs->sync_buff_lock); 548 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { 549 spin_unlock_bh(&ipvs->sync_buff_lock); 550 return; 551 } 552 553 id = select_master_thread_id(ipvs, cp); 554 ms = &ipvs->ms[id]; 555 buff = ms->sync_buff; 556 if (buff) { 557 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg; 558 /* Send buffer if it is for v1 */ 559 if (!m->nr_conns) { 560 sb_queue_tail(ipvs, ms); 561 ms->sync_buff = NULL; 562 buff = NULL; 563 } 564 } 565 if (!buff) { 566 buff = ip_vs_sync_buff_create_v0(ipvs); 567 if (!buff) { 568 spin_unlock_bh(&ipvs->sync_buff_lock); 569 pr_err("ip_vs_sync_buff_create failed.\n"); 570 return; 571 } 572 ms->sync_buff = buff; 573 } 574 575 len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE : 576 SIMPLE_CONN_SIZE; 577 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg; 578 s = (struct ip_vs_sync_conn_v0 *) buff->head; 579 580 /* copy members */ 581 s->reserved = 0; 582 s->protocol = cp->protocol; 583 s->cport = cp->cport; 584 s->vport = cp->vport; 585 s->dport = cp->dport; 586 s->caddr = cp->caddr.ip; 587 s->vaddr = cp->vaddr.ip; 588 s->daddr = cp->daddr.ip; 589 s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED); 590 s->state = htons(cp->state); 591 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) { 592 struct ip_vs_sync_conn_options *opt = 593 (struct ip_vs_sync_conn_options *)&s[1]; 594 memcpy(opt, &cp->in_seq, sizeof(*opt)); 595 } 596 597 m->nr_conns++; 598 m->size = htons(ntohs(m->size) + len); 599 buff->head += len; 600 601 /* check if there is a space for next one */ 602 if (buff->head + FULL_CONN_SIZE > buff->end) { 603 sb_queue_tail(ipvs, ms); 604 ms->sync_buff = NULL; 605 } 606 spin_unlock_bh(&ipvs->sync_buff_lock); 607 608 /* synchronize its controller if it has */ 609 cp = cp->control; 610 if (cp) { 611 if (cp->flags & IP_VS_CONN_F_TEMPLATE) 612 pkts = atomic_add_return(1, &cp->in_pkts); 613 else 614 pkts = sysctl_sync_threshold(ipvs); 615 ip_vs_sync_conn(net, cp->control, pkts); 616 } 617 } 618 619 /* 620 * Add an ip_vs_conn information into the current sync_buff. 621 * Called by ip_vs_in. 622 * Sending Version 1 messages 623 */ 624 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts) 625 { 626 struct netns_ipvs *ipvs = net_ipvs(net); 627 struct ip_vs_sync_mesg *m; 628 union ip_vs_sync_conn *s; 629 struct ip_vs_sync_buff *buff; 630 struct ipvs_master_sync_state *ms; 631 int id; 632 __u8 *p; 633 unsigned int len, pe_name_len, pad; 634 635 /* Handle old version of the protocol */ 636 if (sysctl_sync_ver(ipvs) == 0) { 637 ip_vs_sync_conn_v0(net, cp, pkts); 638 return; 639 } 640 /* Do not sync ONE PACKET */ 641 if (cp->flags & IP_VS_CONN_F_ONE_PACKET) 642 goto control; 643 sloop: 644 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts)) 645 goto control; 646 647 /* Sanity checks */ 648 pe_name_len = 0; 649 if (cp->pe_data_len) { 650 if (!cp->pe_data || !cp->dest) { 651 IP_VS_ERR_RL("SYNC, connection pe_data invalid\n"); 652 return; 653 } 654 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN); 655 } 656 657 spin_lock_bh(&ipvs->sync_buff_lock); 658 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { 659 spin_unlock_bh(&ipvs->sync_buff_lock); 660 return; 661 } 662 663 id = select_master_thread_id(ipvs, cp); 664 ms = &ipvs->ms[id]; 665 666 #ifdef CONFIG_IP_VS_IPV6 667 if (cp->af == AF_INET6) 668 len = sizeof(struct ip_vs_sync_v6); 669 else 670 #endif 671 len = sizeof(struct ip_vs_sync_v4); 672 673 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) 674 len += sizeof(struct ip_vs_sync_conn_options) + 2; 675 676 if (cp->pe_data_len) 677 len += cp->pe_data_len + 2; /* + Param hdr field */ 678 if (pe_name_len) 679 len += pe_name_len + 2; 680 681 /* check if there is a space for this one */ 682 pad = 0; 683 buff = ms->sync_buff; 684 if (buff) { 685 m = buff->mesg; 686 pad = (4 - (size_t) buff->head) & 3; 687 /* Send buffer if it is for v0 */ 688 if (buff->head + len + pad > buff->end || m->reserved) { 689 sb_queue_tail(ipvs, ms); 690 ms->sync_buff = NULL; 691 buff = NULL; 692 pad = 0; 693 } 694 } 695 696 if (!buff) { 697 buff = ip_vs_sync_buff_create(ipvs); 698 if (!buff) { 699 spin_unlock_bh(&ipvs->sync_buff_lock); 700 pr_err("ip_vs_sync_buff_create failed.\n"); 701 return; 702 } 703 ms->sync_buff = buff; 704 m = buff->mesg; 705 } 706 707 p = buff->head; 708 buff->head += pad + len; 709 m->size = htons(ntohs(m->size) + pad + len); 710 /* Add ev. padding from prev. sync_conn */ 711 while (pad--) 712 *(p++) = 0; 713 714 s = (union ip_vs_sync_conn *)p; 715 716 /* Set message type & copy members */ 717 s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0); 718 s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */ 719 s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED); 720 s->v4.state = htons(cp->state); 721 s->v4.protocol = cp->protocol; 722 s->v4.cport = cp->cport; 723 s->v4.vport = cp->vport; 724 s->v4.dport = cp->dport; 725 s->v4.fwmark = htonl(cp->fwmark); 726 s->v4.timeout = htonl(cp->timeout / HZ); 727 m->nr_conns++; 728 729 #ifdef CONFIG_IP_VS_IPV6 730 if (cp->af == AF_INET6) { 731 p += sizeof(struct ip_vs_sync_v6); 732 s->v6.caddr = cp->caddr.in6; 733 s->v6.vaddr = cp->vaddr.in6; 734 s->v6.daddr = cp->daddr.in6; 735 } else 736 #endif 737 { 738 p += sizeof(struct ip_vs_sync_v4); /* options ptr */ 739 s->v4.caddr = cp->caddr.ip; 740 s->v4.vaddr = cp->vaddr.ip; 741 s->v4.daddr = cp->daddr.ip; 742 } 743 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) { 744 *(p++) = IPVS_OPT_SEQ_DATA; 745 *(p++) = sizeof(struct ip_vs_sync_conn_options); 746 hton_seq((struct ip_vs_seq *)p, &cp->in_seq); 747 p += sizeof(struct ip_vs_seq); 748 hton_seq((struct ip_vs_seq *)p, &cp->out_seq); 749 p += sizeof(struct ip_vs_seq); 750 } 751 /* Handle pe data */ 752 if (cp->pe_data_len && cp->pe_data) { 753 *(p++) = IPVS_OPT_PE_DATA; 754 *(p++) = cp->pe_data_len; 755 memcpy(p, cp->pe_data, cp->pe_data_len); 756 p += cp->pe_data_len; 757 if (pe_name_len) { 758 /* Add PE_NAME */ 759 *(p++) = IPVS_OPT_PE_NAME; 760 *(p++) = pe_name_len; 761 memcpy(p, cp->pe->name, pe_name_len); 762 p += pe_name_len; 763 } 764 } 765 766 spin_unlock_bh(&ipvs->sync_buff_lock); 767 768 control: 769 /* synchronize its controller if it has */ 770 cp = cp->control; 771 if (!cp) 772 return; 773 if (cp->flags & IP_VS_CONN_F_TEMPLATE) 774 pkts = atomic_add_return(1, &cp->in_pkts); 775 else 776 pkts = sysctl_sync_threshold(ipvs); 777 goto sloop; 778 } 779 780 /* 781 * fill_param used by version 1 782 */ 783 static inline int 784 ip_vs_conn_fill_param_sync(struct net *net, int af, union ip_vs_sync_conn *sc, 785 struct ip_vs_conn_param *p, 786 __u8 *pe_data, unsigned int pe_data_len, 787 __u8 *pe_name, unsigned int pe_name_len) 788 { 789 #ifdef CONFIG_IP_VS_IPV6 790 if (af == AF_INET6) 791 ip_vs_conn_fill_param(net, af, sc->v6.protocol, 792 (const union nf_inet_addr *)&sc->v6.caddr, 793 sc->v6.cport, 794 (const union nf_inet_addr *)&sc->v6.vaddr, 795 sc->v6.vport, p); 796 else 797 #endif 798 ip_vs_conn_fill_param(net, af, sc->v4.protocol, 799 (const union nf_inet_addr *)&sc->v4.caddr, 800 sc->v4.cport, 801 (const union nf_inet_addr *)&sc->v4.vaddr, 802 sc->v4.vport, p); 803 /* Handle pe data */ 804 if (pe_data_len) { 805 if (pe_name_len) { 806 char buff[IP_VS_PENAME_MAXLEN+1]; 807 808 memcpy(buff, pe_name, pe_name_len); 809 buff[pe_name_len]=0; 810 p->pe = __ip_vs_pe_getbyname(buff); 811 if (!p->pe) { 812 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n", 813 buff); 814 return 1; 815 } 816 } else { 817 IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n"); 818 return 1; 819 } 820 821 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC); 822 if (!p->pe_data) { 823 module_put(p->pe->module); 824 return -ENOMEM; 825 } 826 p->pe_data_len = pe_data_len; 827 } 828 return 0; 829 } 830 831 /* 832 * Connection Add / Update. 833 * Common for version 0 and 1 reception of backup sync_conns. 834 * Param: ... 835 * timeout is in sec. 836 */ 837 static void ip_vs_proc_conn(struct net *net, struct ip_vs_conn_param *param, 838 unsigned int flags, unsigned int state, 839 unsigned int protocol, unsigned int type, 840 const union nf_inet_addr *daddr, __be16 dport, 841 unsigned long timeout, __u32 fwmark, 842 struct ip_vs_sync_conn_options *opt) 843 { 844 struct ip_vs_dest *dest; 845 struct ip_vs_conn *cp; 846 struct netns_ipvs *ipvs = net_ipvs(net); 847 848 if (!(flags & IP_VS_CONN_F_TEMPLATE)) 849 cp = ip_vs_conn_in_get(param); 850 else 851 cp = ip_vs_ct_in_get(param); 852 853 if (cp) { 854 /* Free pe_data */ 855 kfree(param->pe_data); 856 857 dest = cp->dest; 858 spin_lock_bh(&cp->lock); 859 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE && 860 !(flags & IP_VS_CONN_F_TEMPLATE) && dest) { 861 if (flags & IP_VS_CONN_F_INACTIVE) { 862 atomic_dec(&dest->activeconns); 863 atomic_inc(&dest->inactconns); 864 } else { 865 atomic_inc(&dest->activeconns); 866 atomic_dec(&dest->inactconns); 867 } 868 } 869 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK; 870 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK; 871 cp->flags = flags; 872 spin_unlock_bh(&cp->lock); 873 if (!dest) 874 ip_vs_try_bind_dest(cp); 875 } else { 876 /* 877 * Find the appropriate destination for the connection. 878 * If it is not found the connection will remain unbound 879 * but still handled. 880 */ 881 rcu_read_lock(); 882 /* This function is only invoked by the synchronization 883 * code. We do not currently support heterogeneous pools 884 * with synchronization, so we can make the assumption that 885 * the svc_af is the same as the dest_af 886 */ 887 dest = ip_vs_find_dest(net, type, type, daddr, dport, 888 param->vaddr, param->vport, protocol, 889 fwmark, flags); 890 891 cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest, 892 fwmark); 893 rcu_read_unlock(); 894 if (!cp) { 895 kfree(param->pe_data); 896 IP_VS_DBG(2, "BACKUP, add new conn. failed\n"); 897 return; 898 } 899 if (!(flags & IP_VS_CONN_F_TEMPLATE)) 900 kfree(param->pe_data); 901 } 902 903 if (opt) 904 memcpy(&cp->in_seq, opt, sizeof(*opt)); 905 atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs)); 906 cp->state = state; 907 cp->old_state = cp->state; 908 /* 909 * For Ver 0 messages style 910 * - Not possible to recover the right timeout for templates 911 * - can not find the right fwmark 912 * virtual service. If needed, we can do it for 913 * non-fwmark persistent services. 914 * Ver 1 messages style. 915 * - No problem. 916 */ 917 if (timeout) { 918 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ) 919 timeout = MAX_SCHEDULE_TIMEOUT / HZ; 920 cp->timeout = timeout*HZ; 921 } else { 922 struct ip_vs_proto_data *pd; 923 924 pd = ip_vs_proto_data_get(net, protocol); 925 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table) 926 cp->timeout = pd->timeout_table[state]; 927 else 928 cp->timeout = (3*60*HZ); 929 } 930 ip_vs_conn_put(cp); 931 } 932 933 /* 934 * Process received multicast message for Version 0 935 */ 936 static void ip_vs_process_message_v0(struct net *net, const char *buffer, 937 const size_t buflen) 938 { 939 struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer; 940 struct ip_vs_sync_conn_v0 *s; 941 struct ip_vs_sync_conn_options *opt; 942 struct ip_vs_protocol *pp; 943 struct ip_vs_conn_param param; 944 char *p; 945 int i; 946 947 p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0); 948 for (i=0; i<m->nr_conns; i++) { 949 unsigned int flags, state; 950 951 if (p + SIMPLE_CONN_SIZE > buffer+buflen) { 952 IP_VS_ERR_RL("BACKUP v0, bogus conn\n"); 953 return; 954 } 955 s = (struct ip_vs_sync_conn_v0 *) p; 956 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC; 957 flags &= ~IP_VS_CONN_F_HASHED; 958 if (flags & IP_VS_CONN_F_SEQ_MASK) { 959 opt = (struct ip_vs_sync_conn_options *)&s[1]; 960 p += FULL_CONN_SIZE; 961 if (p > buffer+buflen) { 962 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n"); 963 return; 964 } 965 } else { 966 opt = NULL; 967 p += SIMPLE_CONN_SIZE; 968 } 969 970 state = ntohs(s->state); 971 if (!(flags & IP_VS_CONN_F_TEMPLATE)) { 972 pp = ip_vs_proto_get(s->protocol); 973 if (!pp) { 974 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n", 975 s->protocol); 976 continue; 977 } 978 if (state >= pp->num_states) { 979 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n", 980 pp->name, state); 981 continue; 982 } 983 } else { 984 /* protocol in templates is not used for state/timeout */ 985 if (state > 0) { 986 IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n", 987 state); 988 state = 0; 989 } 990 } 991 992 ip_vs_conn_fill_param(net, AF_INET, s->protocol, 993 (const union nf_inet_addr *)&s->caddr, 994 s->cport, 995 (const union nf_inet_addr *)&s->vaddr, 996 s->vport, ¶m); 997 998 /* Send timeout as Zero */ 999 ip_vs_proc_conn(net, ¶m, flags, state, s->protocol, AF_INET, 1000 (union nf_inet_addr *)&s->daddr, s->dport, 1001 0, 0, opt); 1002 } 1003 } 1004 1005 /* 1006 * Handle options 1007 */ 1008 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen, 1009 __u32 *opt_flags, 1010 struct ip_vs_sync_conn_options *opt) 1011 { 1012 struct ip_vs_sync_conn_options *topt; 1013 1014 topt = (struct ip_vs_sync_conn_options *)p; 1015 1016 if (plen != sizeof(struct ip_vs_sync_conn_options)) { 1017 IP_VS_DBG(2, "BACKUP, bogus conn options length\n"); 1018 return -EINVAL; 1019 } 1020 if (*opt_flags & IPVS_OPT_F_SEQ_DATA) { 1021 IP_VS_DBG(2, "BACKUP, conn options found twice\n"); 1022 return -EINVAL; 1023 } 1024 ntoh_seq(&topt->in_seq, &opt->in_seq); 1025 ntoh_seq(&topt->out_seq, &opt->out_seq); 1026 *opt_flags |= IPVS_OPT_F_SEQ_DATA; 1027 return 0; 1028 } 1029 1030 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len, 1031 __u8 **data, unsigned int maxlen, 1032 __u32 *opt_flags, __u32 flag) 1033 { 1034 if (plen > maxlen) { 1035 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen); 1036 return -EINVAL; 1037 } 1038 if (*opt_flags & flag) { 1039 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag); 1040 return -EINVAL; 1041 } 1042 *data_len = plen; 1043 *data = p; 1044 *opt_flags |= flag; 1045 return 0; 1046 } 1047 /* 1048 * Process a Version 1 sync. connection 1049 */ 1050 static inline int ip_vs_proc_sync_conn(struct net *net, __u8 *p, __u8 *msg_end) 1051 { 1052 struct ip_vs_sync_conn_options opt; 1053 union ip_vs_sync_conn *s; 1054 struct ip_vs_protocol *pp; 1055 struct ip_vs_conn_param param; 1056 __u32 flags; 1057 unsigned int af, state, pe_data_len=0, pe_name_len=0; 1058 __u8 *pe_data=NULL, *pe_name=NULL; 1059 __u32 opt_flags=0; 1060 int retc=0; 1061 1062 s = (union ip_vs_sync_conn *) p; 1063 1064 if (s->v6.type & STYPE_F_INET6) { 1065 #ifdef CONFIG_IP_VS_IPV6 1066 af = AF_INET6; 1067 p += sizeof(struct ip_vs_sync_v6); 1068 #else 1069 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n"); 1070 retc = 10; 1071 goto out; 1072 #endif 1073 } else if (!s->v4.type) { 1074 af = AF_INET; 1075 p += sizeof(struct ip_vs_sync_v4); 1076 } else { 1077 return -10; 1078 } 1079 if (p > msg_end) 1080 return -20; 1081 1082 /* Process optional params check Type & Len. */ 1083 while (p < msg_end) { 1084 int ptype; 1085 int plen; 1086 1087 if (p+2 > msg_end) 1088 return -30; 1089 ptype = *(p++); 1090 plen = *(p++); 1091 1092 if (!plen || ((p + plen) > msg_end)) 1093 return -40; 1094 /* Handle seq option p = param data */ 1095 switch (ptype & ~IPVS_OPT_F_PARAM) { 1096 case IPVS_OPT_SEQ_DATA: 1097 if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt)) 1098 return -50; 1099 break; 1100 1101 case IPVS_OPT_PE_DATA: 1102 if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data, 1103 IP_VS_PEDATA_MAXLEN, &opt_flags, 1104 IPVS_OPT_F_PE_DATA)) 1105 return -60; 1106 break; 1107 1108 case IPVS_OPT_PE_NAME: 1109 if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name, 1110 IP_VS_PENAME_MAXLEN, &opt_flags, 1111 IPVS_OPT_F_PE_NAME)) 1112 return -70; 1113 break; 1114 1115 default: 1116 /* Param data mandatory ? */ 1117 if (!(ptype & IPVS_OPT_F_PARAM)) { 1118 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n", 1119 ptype & ~IPVS_OPT_F_PARAM); 1120 retc = 20; 1121 goto out; 1122 } 1123 } 1124 p += plen; /* Next option */ 1125 } 1126 1127 /* Get flags and Mask off unsupported */ 1128 flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK; 1129 flags |= IP_VS_CONN_F_SYNC; 1130 state = ntohs(s->v4.state); 1131 1132 if (!(flags & IP_VS_CONN_F_TEMPLATE)) { 1133 pp = ip_vs_proto_get(s->v4.protocol); 1134 if (!pp) { 1135 IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n", 1136 s->v4.protocol); 1137 retc = 30; 1138 goto out; 1139 } 1140 if (state >= pp->num_states) { 1141 IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n", 1142 pp->name, state); 1143 retc = 40; 1144 goto out; 1145 } 1146 } else { 1147 /* protocol in templates is not used for state/timeout */ 1148 if (state > 0) { 1149 IP_VS_DBG(3, "BACKUP, Invalid template state %u\n", 1150 state); 1151 state = 0; 1152 } 1153 } 1154 if (ip_vs_conn_fill_param_sync(net, af, s, ¶m, pe_data, 1155 pe_data_len, pe_name, pe_name_len)) { 1156 retc = 50; 1157 goto out; 1158 } 1159 /* If only IPv4, just silent skip IPv6 */ 1160 if (af == AF_INET) 1161 ip_vs_proc_conn(net, ¶m, flags, state, s->v4.protocol, af, 1162 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport, 1163 ntohl(s->v4.timeout), ntohl(s->v4.fwmark), 1164 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL) 1165 ); 1166 #ifdef CONFIG_IP_VS_IPV6 1167 else 1168 ip_vs_proc_conn(net, ¶m, flags, state, s->v6.protocol, af, 1169 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport, 1170 ntohl(s->v6.timeout), ntohl(s->v6.fwmark), 1171 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL) 1172 ); 1173 #endif 1174 ip_vs_pe_put(param.pe); 1175 return 0; 1176 /* Error exit */ 1177 out: 1178 IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc); 1179 return retc; 1180 1181 } 1182 /* 1183 * Process received multicast message and create the corresponding 1184 * ip_vs_conn entries. 1185 * Handles Version 0 & 1 1186 */ 1187 static void ip_vs_process_message(struct net *net, __u8 *buffer, 1188 const size_t buflen) 1189 { 1190 struct netns_ipvs *ipvs = net_ipvs(net); 1191 struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer; 1192 __u8 *p, *msg_end; 1193 int i, nr_conns; 1194 1195 if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) { 1196 IP_VS_DBG(2, "BACKUP, message header too short\n"); 1197 return; 1198 } 1199 1200 if (buflen != ntohs(m2->size)) { 1201 IP_VS_DBG(2, "BACKUP, bogus message size\n"); 1202 return; 1203 } 1204 /* SyncID sanity check */ 1205 if (ipvs->backup_syncid != 0 && m2->syncid != ipvs->backup_syncid) { 1206 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid); 1207 return; 1208 } 1209 /* Handle version 1 message */ 1210 if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0) 1211 && (m2->spare == 0)) { 1212 1213 msg_end = buffer + sizeof(struct ip_vs_sync_mesg); 1214 nr_conns = m2->nr_conns; 1215 1216 for (i=0; i<nr_conns; i++) { 1217 union ip_vs_sync_conn *s; 1218 unsigned int size; 1219 int retc; 1220 1221 p = msg_end; 1222 if (p + sizeof(s->v4) > buffer+buflen) { 1223 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n"); 1224 return; 1225 } 1226 s = (union ip_vs_sync_conn *)p; 1227 size = ntohs(s->v4.ver_size) & SVER_MASK; 1228 msg_end = p + size; 1229 /* Basic sanity checks */ 1230 if (msg_end > buffer+buflen) { 1231 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n"); 1232 return; 1233 } 1234 if (ntohs(s->v4.ver_size) >> SVER_SHIFT) { 1235 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n", 1236 ntohs(s->v4.ver_size) >> SVER_SHIFT); 1237 return; 1238 } 1239 /* Process a single sync_conn */ 1240 retc = ip_vs_proc_sync_conn(net, p, msg_end); 1241 if (retc < 0) { 1242 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n", 1243 retc); 1244 return; 1245 } 1246 /* Make sure we have 32 bit alignment */ 1247 msg_end = p + ((size + 3) & ~3); 1248 } 1249 } else { 1250 /* Old type of message */ 1251 ip_vs_process_message_v0(net, buffer, buflen); 1252 return; 1253 } 1254 } 1255 1256 1257 /* 1258 * Setup sndbuf (mode=1) or rcvbuf (mode=0) 1259 */ 1260 static void set_sock_size(struct sock *sk, int mode, int val) 1261 { 1262 /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */ 1263 /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */ 1264 lock_sock(sk); 1265 if (mode) { 1266 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2, 1267 sysctl_wmem_max); 1268 sk->sk_sndbuf = val * 2; 1269 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1270 } else { 1271 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2, 1272 sysctl_rmem_max); 1273 sk->sk_rcvbuf = val * 2; 1274 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1275 } 1276 release_sock(sk); 1277 } 1278 1279 /* 1280 * Setup loopback of outgoing multicasts on a sending socket 1281 */ 1282 static void set_mcast_loop(struct sock *sk, u_char loop) 1283 { 1284 struct inet_sock *inet = inet_sk(sk); 1285 1286 /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */ 1287 lock_sock(sk); 1288 inet->mc_loop = loop ? 1 : 0; 1289 release_sock(sk); 1290 } 1291 1292 /* 1293 * Specify TTL for outgoing multicasts on a sending socket 1294 */ 1295 static void set_mcast_ttl(struct sock *sk, u_char ttl) 1296 { 1297 struct inet_sock *inet = inet_sk(sk); 1298 1299 /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */ 1300 lock_sock(sk); 1301 inet->mc_ttl = ttl; 1302 release_sock(sk); 1303 } 1304 1305 /* 1306 * Specifiy default interface for outgoing multicasts 1307 */ 1308 static int set_mcast_if(struct sock *sk, char *ifname) 1309 { 1310 struct net_device *dev; 1311 struct inet_sock *inet = inet_sk(sk); 1312 struct net *net = sock_net(sk); 1313 1314 dev = __dev_get_by_name(net, ifname); 1315 if (!dev) 1316 return -ENODEV; 1317 1318 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) 1319 return -EINVAL; 1320 1321 lock_sock(sk); 1322 inet->mc_index = dev->ifindex; 1323 /* inet->mc_addr = 0; */ 1324 release_sock(sk); 1325 1326 return 0; 1327 } 1328 1329 1330 /* 1331 * Set the maximum length of sync message according to the 1332 * specified interface's MTU. 1333 */ 1334 static int set_sync_mesg_maxlen(struct net *net, int sync_state) 1335 { 1336 struct netns_ipvs *ipvs = net_ipvs(net); 1337 struct net_device *dev; 1338 int num; 1339 1340 if (sync_state == IP_VS_STATE_MASTER) { 1341 dev = __dev_get_by_name(net, ipvs->master_mcast_ifn); 1342 if (!dev) 1343 return -ENODEV; 1344 1345 num = (dev->mtu - sizeof(struct iphdr) - 1346 sizeof(struct udphdr) - 1347 SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE; 1348 ipvs->send_mesg_maxlen = SYNC_MESG_HEADER_LEN + 1349 SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF); 1350 IP_VS_DBG(7, "setting the maximum length of sync sending " 1351 "message %d.\n", ipvs->send_mesg_maxlen); 1352 } else if (sync_state == IP_VS_STATE_BACKUP) { 1353 dev = __dev_get_by_name(net, ipvs->backup_mcast_ifn); 1354 if (!dev) 1355 return -ENODEV; 1356 1357 ipvs->recv_mesg_maxlen = dev->mtu - 1358 sizeof(struct iphdr) - sizeof(struct udphdr); 1359 IP_VS_DBG(7, "setting the maximum length of sync receiving " 1360 "message %d.\n", ipvs->recv_mesg_maxlen); 1361 } 1362 1363 return 0; 1364 } 1365 1366 1367 /* 1368 * Join a multicast group. 1369 * the group is specified by a class D multicast address 224.0.0.0/8 1370 * in the in_addr structure passed in as a parameter. 1371 */ 1372 static int 1373 join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname) 1374 { 1375 struct net *net = sock_net(sk); 1376 struct ip_mreqn mreq; 1377 struct net_device *dev; 1378 int ret; 1379 1380 memset(&mreq, 0, sizeof(mreq)); 1381 memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr)); 1382 1383 dev = __dev_get_by_name(net, ifname); 1384 if (!dev) 1385 return -ENODEV; 1386 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) 1387 return -EINVAL; 1388 1389 mreq.imr_ifindex = dev->ifindex; 1390 1391 lock_sock(sk); 1392 ret = ip_mc_join_group(sk, &mreq); 1393 release_sock(sk); 1394 1395 return ret; 1396 } 1397 1398 1399 static int bind_mcastif_addr(struct socket *sock, char *ifname) 1400 { 1401 struct net *net = sock_net(sock->sk); 1402 struct net_device *dev; 1403 __be32 addr; 1404 struct sockaddr_in sin; 1405 1406 dev = __dev_get_by_name(net, ifname); 1407 if (!dev) 1408 return -ENODEV; 1409 1410 addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); 1411 if (!addr) 1412 pr_err("You probably need to specify IP address on " 1413 "multicast interface.\n"); 1414 1415 IP_VS_DBG(7, "binding socket with (%s) %pI4\n", 1416 ifname, &addr); 1417 1418 /* Now bind the socket with the address of multicast interface */ 1419 sin.sin_family = AF_INET; 1420 sin.sin_addr.s_addr = addr; 1421 sin.sin_port = 0; 1422 1423 return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin)); 1424 } 1425 1426 /* 1427 * Set up sending multicast socket over UDP 1428 */ 1429 static struct socket *make_send_sock(struct net *net, int id) 1430 { 1431 struct netns_ipvs *ipvs = net_ipvs(net); 1432 /* multicast addr */ 1433 struct sockaddr_in mcast_addr = { 1434 .sin_family = AF_INET, 1435 .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id), 1436 .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP), 1437 }; 1438 struct socket *sock; 1439 int result; 1440 1441 /* First create a socket move it to right name space later */ 1442 result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); 1443 if (result < 0) { 1444 pr_err("Error during creation of socket; terminating\n"); 1445 return ERR_PTR(result); 1446 } 1447 /* 1448 * Kernel sockets that are a part of a namespace, should not 1449 * hold a reference to a namespace in order to allow to stop it. 1450 * After sk_change_net should be released using sk_release_kernel. 1451 */ 1452 sk_change_net(sock->sk, net); 1453 result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn); 1454 if (result < 0) { 1455 pr_err("Error setting outbound mcast interface\n"); 1456 goto error; 1457 } 1458 1459 set_mcast_loop(sock->sk, 0); 1460 set_mcast_ttl(sock->sk, 1); 1461 result = sysctl_sync_sock_size(ipvs); 1462 if (result > 0) 1463 set_sock_size(sock->sk, 1, result); 1464 1465 result = bind_mcastif_addr(sock, ipvs->master_mcast_ifn); 1466 if (result < 0) { 1467 pr_err("Error binding address of the mcast interface\n"); 1468 goto error; 1469 } 1470 1471 result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr, 1472 sizeof(struct sockaddr), 0); 1473 if (result < 0) { 1474 pr_err("Error connecting to the multicast addr\n"); 1475 goto error; 1476 } 1477 1478 return sock; 1479 1480 error: 1481 sk_release_kernel(sock->sk); 1482 return ERR_PTR(result); 1483 } 1484 1485 1486 /* 1487 * Set up receiving multicast socket over UDP 1488 */ 1489 static struct socket *make_receive_sock(struct net *net, int id) 1490 { 1491 struct netns_ipvs *ipvs = net_ipvs(net); 1492 /* multicast addr */ 1493 struct sockaddr_in mcast_addr = { 1494 .sin_family = AF_INET, 1495 .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id), 1496 .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP), 1497 }; 1498 struct socket *sock; 1499 int result; 1500 1501 /* First create a socket */ 1502 result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); 1503 if (result < 0) { 1504 pr_err("Error during creation of socket; terminating\n"); 1505 return ERR_PTR(result); 1506 } 1507 /* 1508 * Kernel sockets that are a part of a namespace, should not 1509 * hold a reference to a namespace in order to allow to stop it. 1510 * After sk_change_net should be released using sk_release_kernel. 1511 */ 1512 sk_change_net(sock->sk, net); 1513 /* it is equivalent to the REUSEADDR option in user-space */ 1514 sock->sk->sk_reuse = SK_CAN_REUSE; 1515 result = sysctl_sync_sock_size(ipvs); 1516 if (result > 0) 1517 set_sock_size(sock->sk, 0, result); 1518 1519 result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr, 1520 sizeof(struct sockaddr)); 1521 if (result < 0) { 1522 pr_err("Error binding to the multicast addr\n"); 1523 goto error; 1524 } 1525 1526 /* join the multicast group */ 1527 result = join_mcast_group(sock->sk, 1528 (struct in_addr *) &mcast_addr.sin_addr, 1529 ipvs->backup_mcast_ifn); 1530 if (result < 0) { 1531 pr_err("Error joining to the multicast group\n"); 1532 goto error; 1533 } 1534 1535 return sock; 1536 1537 error: 1538 sk_release_kernel(sock->sk); 1539 return ERR_PTR(result); 1540 } 1541 1542 1543 static int 1544 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length) 1545 { 1546 struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL}; 1547 struct kvec iov; 1548 int len; 1549 1550 EnterFunction(7); 1551 iov.iov_base = (void *)buffer; 1552 iov.iov_len = length; 1553 1554 len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length)); 1555 1556 LeaveFunction(7); 1557 return len; 1558 } 1559 1560 static int 1561 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg) 1562 { 1563 int msize; 1564 int ret; 1565 1566 msize = ntohs(msg->size); 1567 1568 ret = ip_vs_send_async(sock, (char *)msg, msize); 1569 if (ret >= 0 || ret == -EAGAIN) 1570 return ret; 1571 pr_err("ip_vs_send_async error %d\n", ret); 1572 return 0; 1573 } 1574 1575 static int 1576 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen) 1577 { 1578 struct msghdr msg = {NULL,}; 1579 struct kvec iov; 1580 int len; 1581 1582 EnterFunction(7); 1583 1584 /* Receive a packet */ 1585 iov.iov_base = buffer; 1586 iov.iov_len = (size_t)buflen; 1587 1588 len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, MSG_DONTWAIT); 1589 1590 if (len < 0) 1591 return len; 1592 1593 LeaveFunction(7); 1594 return len; 1595 } 1596 1597 /* Wakeup the master thread for sending */ 1598 static void master_wakeup_work_handler(struct work_struct *work) 1599 { 1600 struct ipvs_master_sync_state *ms = 1601 container_of(work, struct ipvs_master_sync_state, 1602 master_wakeup_work.work); 1603 struct netns_ipvs *ipvs = ms->ipvs; 1604 1605 spin_lock_bh(&ipvs->sync_lock); 1606 if (ms->sync_queue_len && 1607 ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) { 1608 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE; 1609 wake_up_process(ms->master_thread); 1610 } 1611 spin_unlock_bh(&ipvs->sync_lock); 1612 } 1613 1614 /* Get next buffer to send */ 1615 static inline struct ip_vs_sync_buff * 1616 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms) 1617 { 1618 struct ip_vs_sync_buff *sb; 1619 1620 sb = sb_dequeue(ipvs, ms); 1621 if (sb) 1622 return sb; 1623 /* Do not delay entries in buffer for more than 2 seconds */ 1624 return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME); 1625 } 1626 1627 static int sync_thread_master(void *data) 1628 { 1629 struct ip_vs_sync_thread_data *tinfo = data; 1630 struct netns_ipvs *ipvs = net_ipvs(tinfo->net); 1631 struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id]; 1632 struct sock *sk = tinfo->sock->sk; 1633 struct ip_vs_sync_buff *sb; 1634 1635 pr_info("sync thread started: state = MASTER, mcast_ifn = %s, " 1636 "syncid = %d, id = %d\n", 1637 ipvs->master_mcast_ifn, ipvs->master_syncid, tinfo->id); 1638 1639 for (;;) { 1640 sb = next_sync_buff(ipvs, ms); 1641 if (unlikely(kthread_should_stop())) 1642 break; 1643 if (!sb) { 1644 schedule_timeout(IPVS_SYNC_CHECK_PERIOD); 1645 continue; 1646 } 1647 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) { 1648 /* (Ab)use interruptible sleep to avoid increasing 1649 * the load avg. 1650 */ 1651 __wait_event_interruptible(*sk_sleep(sk), 1652 sock_writeable(sk) || 1653 kthread_should_stop()); 1654 if (unlikely(kthread_should_stop())) 1655 goto done; 1656 } 1657 ip_vs_sync_buff_release(sb); 1658 } 1659 1660 done: 1661 __set_current_state(TASK_RUNNING); 1662 if (sb) 1663 ip_vs_sync_buff_release(sb); 1664 1665 /* clean up the sync_buff queue */ 1666 while ((sb = sb_dequeue(ipvs, ms))) 1667 ip_vs_sync_buff_release(sb); 1668 __set_current_state(TASK_RUNNING); 1669 1670 /* clean up the current sync_buff */ 1671 sb = get_curr_sync_buff(ipvs, ms, 0); 1672 if (sb) 1673 ip_vs_sync_buff_release(sb); 1674 1675 /* release the sending multicast socket */ 1676 sk_release_kernel(tinfo->sock->sk); 1677 kfree(tinfo); 1678 1679 return 0; 1680 } 1681 1682 1683 static int sync_thread_backup(void *data) 1684 { 1685 struct ip_vs_sync_thread_data *tinfo = data; 1686 struct netns_ipvs *ipvs = net_ipvs(tinfo->net); 1687 int len; 1688 1689 pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, " 1690 "syncid = %d, id = %d\n", 1691 ipvs->backup_mcast_ifn, ipvs->backup_syncid, tinfo->id); 1692 1693 while (!kthread_should_stop()) { 1694 wait_event_interruptible(*sk_sleep(tinfo->sock->sk), 1695 !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue) 1696 || kthread_should_stop()); 1697 1698 /* do we have data now? */ 1699 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) { 1700 len = ip_vs_receive(tinfo->sock, tinfo->buf, 1701 ipvs->recv_mesg_maxlen); 1702 if (len <= 0) { 1703 if (len != -EAGAIN) 1704 pr_err("receiving message error\n"); 1705 break; 1706 } 1707 1708 ip_vs_process_message(tinfo->net, tinfo->buf, len); 1709 } 1710 } 1711 1712 /* release the sending multicast socket */ 1713 sk_release_kernel(tinfo->sock->sk); 1714 kfree(tinfo->buf); 1715 kfree(tinfo); 1716 1717 return 0; 1718 } 1719 1720 1721 int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid) 1722 { 1723 struct ip_vs_sync_thread_data *tinfo; 1724 struct task_struct **array = NULL, *task; 1725 struct socket *sock; 1726 struct netns_ipvs *ipvs = net_ipvs(net); 1727 char *name; 1728 int (*threadfn)(void *data); 1729 int id, count; 1730 int result = -ENOMEM; 1731 1732 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current)); 1733 IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n", 1734 sizeof(struct ip_vs_sync_conn_v0)); 1735 1736 if (!ipvs->sync_state) { 1737 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX); 1738 ipvs->threads_mask = count - 1; 1739 } else 1740 count = ipvs->threads_mask + 1; 1741 1742 if (state == IP_VS_STATE_MASTER) { 1743 if (ipvs->ms) 1744 return -EEXIST; 1745 1746 strlcpy(ipvs->master_mcast_ifn, mcast_ifn, 1747 sizeof(ipvs->master_mcast_ifn)); 1748 ipvs->master_syncid = syncid; 1749 name = "ipvs-m:%d:%d"; 1750 threadfn = sync_thread_master; 1751 } else if (state == IP_VS_STATE_BACKUP) { 1752 if (ipvs->backup_threads) 1753 return -EEXIST; 1754 1755 strlcpy(ipvs->backup_mcast_ifn, mcast_ifn, 1756 sizeof(ipvs->backup_mcast_ifn)); 1757 ipvs->backup_syncid = syncid; 1758 name = "ipvs-b:%d:%d"; 1759 threadfn = sync_thread_backup; 1760 } else { 1761 return -EINVAL; 1762 } 1763 1764 if (state == IP_VS_STATE_MASTER) { 1765 struct ipvs_master_sync_state *ms; 1766 1767 ipvs->ms = kzalloc(count * sizeof(ipvs->ms[0]), GFP_KERNEL); 1768 if (!ipvs->ms) 1769 goto out; 1770 ms = ipvs->ms; 1771 for (id = 0; id < count; id++, ms++) { 1772 INIT_LIST_HEAD(&ms->sync_queue); 1773 ms->sync_queue_len = 0; 1774 ms->sync_queue_delay = 0; 1775 INIT_DELAYED_WORK(&ms->master_wakeup_work, 1776 master_wakeup_work_handler); 1777 ms->ipvs = ipvs; 1778 } 1779 } else { 1780 array = kzalloc(count * sizeof(struct task_struct *), 1781 GFP_KERNEL); 1782 if (!array) 1783 goto out; 1784 } 1785 set_sync_mesg_maxlen(net, state); 1786 1787 tinfo = NULL; 1788 for (id = 0; id < count; id++) { 1789 if (state == IP_VS_STATE_MASTER) 1790 sock = make_send_sock(net, id); 1791 else 1792 sock = make_receive_sock(net, id); 1793 if (IS_ERR(sock)) { 1794 result = PTR_ERR(sock); 1795 goto outtinfo; 1796 } 1797 tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL); 1798 if (!tinfo) 1799 goto outsocket; 1800 tinfo->net = net; 1801 tinfo->sock = sock; 1802 if (state == IP_VS_STATE_BACKUP) { 1803 tinfo->buf = kmalloc(ipvs->recv_mesg_maxlen, 1804 GFP_KERNEL); 1805 if (!tinfo->buf) 1806 goto outtinfo; 1807 } else { 1808 tinfo->buf = NULL; 1809 } 1810 tinfo->id = id; 1811 1812 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id); 1813 if (IS_ERR(task)) { 1814 result = PTR_ERR(task); 1815 goto outtinfo; 1816 } 1817 tinfo = NULL; 1818 if (state == IP_VS_STATE_MASTER) 1819 ipvs->ms[id].master_thread = task; 1820 else 1821 array[id] = task; 1822 } 1823 1824 /* mark as active */ 1825 1826 if (state == IP_VS_STATE_BACKUP) 1827 ipvs->backup_threads = array; 1828 spin_lock_bh(&ipvs->sync_buff_lock); 1829 ipvs->sync_state |= state; 1830 spin_unlock_bh(&ipvs->sync_buff_lock); 1831 1832 /* increase the module use count */ 1833 ip_vs_use_count_inc(); 1834 1835 return 0; 1836 1837 outsocket: 1838 sk_release_kernel(sock->sk); 1839 1840 outtinfo: 1841 if (tinfo) { 1842 sk_release_kernel(tinfo->sock->sk); 1843 kfree(tinfo->buf); 1844 kfree(tinfo); 1845 } 1846 count = id; 1847 while (count-- > 0) { 1848 if (state == IP_VS_STATE_MASTER) 1849 kthread_stop(ipvs->ms[count].master_thread); 1850 else 1851 kthread_stop(array[count]); 1852 } 1853 kfree(array); 1854 1855 out: 1856 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { 1857 kfree(ipvs->ms); 1858 ipvs->ms = NULL; 1859 } 1860 return result; 1861 } 1862 1863 1864 int stop_sync_thread(struct net *net, int state) 1865 { 1866 struct netns_ipvs *ipvs = net_ipvs(net); 1867 struct task_struct **array; 1868 int id; 1869 int retc = -EINVAL; 1870 1871 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current)); 1872 1873 if (state == IP_VS_STATE_MASTER) { 1874 if (!ipvs->ms) 1875 return -ESRCH; 1876 1877 /* 1878 * The lock synchronizes with sb_queue_tail(), so that we don't 1879 * add sync buffers to the queue, when we are already in 1880 * progress of stopping the master sync daemon. 1881 */ 1882 1883 spin_lock_bh(&ipvs->sync_buff_lock); 1884 spin_lock(&ipvs->sync_lock); 1885 ipvs->sync_state &= ~IP_VS_STATE_MASTER; 1886 spin_unlock(&ipvs->sync_lock); 1887 spin_unlock_bh(&ipvs->sync_buff_lock); 1888 1889 retc = 0; 1890 for (id = ipvs->threads_mask; id >= 0; id--) { 1891 struct ipvs_master_sync_state *ms = &ipvs->ms[id]; 1892 int ret; 1893 1894 pr_info("stopping master sync thread %d ...\n", 1895 task_pid_nr(ms->master_thread)); 1896 cancel_delayed_work_sync(&ms->master_wakeup_work); 1897 ret = kthread_stop(ms->master_thread); 1898 if (retc >= 0) 1899 retc = ret; 1900 } 1901 kfree(ipvs->ms); 1902 ipvs->ms = NULL; 1903 } else if (state == IP_VS_STATE_BACKUP) { 1904 if (!ipvs->backup_threads) 1905 return -ESRCH; 1906 1907 ipvs->sync_state &= ~IP_VS_STATE_BACKUP; 1908 array = ipvs->backup_threads; 1909 retc = 0; 1910 for (id = ipvs->threads_mask; id >= 0; id--) { 1911 int ret; 1912 1913 pr_info("stopping backup sync thread %d ...\n", 1914 task_pid_nr(array[id])); 1915 ret = kthread_stop(array[id]); 1916 if (retc >= 0) 1917 retc = ret; 1918 } 1919 kfree(array); 1920 ipvs->backup_threads = NULL; 1921 } 1922 1923 /* decrease the module use count */ 1924 ip_vs_use_count_dec(); 1925 1926 return retc; 1927 } 1928 1929 /* 1930 * Initialize data struct for each netns 1931 */ 1932 int __net_init ip_vs_sync_net_init(struct net *net) 1933 { 1934 struct netns_ipvs *ipvs = net_ipvs(net); 1935 1936 __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key); 1937 spin_lock_init(&ipvs->sync_lock); 1938 spin_lock_init(&ipvs->sync_buff_lock); 1939 return 0; 1940 } 1941 1942 void ip_vs_sync_net_cleanup(struct net *net) 1943 { 1944 int retc; 1945 struct netns_ipvs *ipvs = net_ipvs(net); 1946 1947 mutex_lock(&ipvs->sync_mutex); 1948 retc = stop_sync_thread(net, IP_VS_STATE_MASTER); 1949 if (retc && retc != -ESRCH) 1950 pr_err("Failed to stop Master Daemon\n"); 1951 1952 retc = stop_sync_thread(net, IP_VS_STATE_BACKUP); 1953 if (retc && retc != -ESRCH) 1954 pr_err("Failed to stop Backup Daemon\n"); 1955 mutex_unlock(&ipvs->sync_mutex); 1956 } 1957
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