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_sync.c,v 1.13 2003/06/08 09:31:19 wensong Exp $ |
| 9 | * |
| 10 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 11 | * |
| 12 | * ip_vs_sync: sync connection info from master load balancer to backups |
| 13 | * through multicast |
| 14 | * |
| 15 | * Changes: |
| 16 | * Alexandre Cassen : Added master & backup support at a time. |
| 17 | * Alexandre Cassen : Added SyncID support for incoming sync |
| 18 | * messages filtering. |
| 19 | * Justin Ossevoort : Fix endian problem on sync message size. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/slab.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 24 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/net.h> |
| 26 | #include <linux/completion.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/skbuff.h> |
| 29 | #include <linux/in.h> |
| 30 | #include <linux/igmp.h> /* for ip_mc_join_group */ |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 31 | #include <linux/udp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <net/ip.h> |
| 34 | #include <net/sock.h> |
| 35 | #include <asm/uaccess.h> /* for get_fs and set_fs */ |
| 36 | |
| 37 | #include <net/ip_vs.h> |
| 38 | |
| 39 | #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */ |
| 40 | #define IP_VS_SYNC_PORT 8848 /* multicast port */ |
| 41 | |
| 42 | |
| 43 | /* |
| 44 | * IPVS sync connection entry |
| 45 | */ |
| 46 | struct ip_vs_sync_conn { |
| 47 | __u8 reserved; |
| 48 | |
| 49 | /* Protocol, addresses and port numbers */ |
| 50 | __u8 protocol; /* Which protocol (TCP/UDP) */ |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 51 | __be16 cport; |
| 52 | __be16 vport; |
| 53 | __be16 dport; |
| 54 | __be32 caddr; /* client address */ |
| 55 | __be32 vaddr; /* virtual address */ |
| 56 | __be32 daddr; /* destination address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /* Flags and state transition */ |
Al Viro | 014d730 | 2006-09-28 14:29:52 -0700 | [diff] [blame] | 59 | __be16 flags; /* status flags */ |
| 60 | __be16 state; /* state info */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | /* The sequence options start here */ |
| 63 | }; |
| 64 | |
| 65 | struct ip_vs_sync_conn_options { |
| 66 | struct ip_vs_seq in_seq; /* incoming seq. struct */ |
| 67 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ |
| 68 | }; |
| 69 | |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 70 | struct ip_vs_sync_thread_data { |
| 71 | struct completion *startup; |
| 72 | int state; |
| 73 | }; |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn)) |
| 76 | #define FULL_CONN_SIZE \ |
| 77 | (sizeof(struct ip_vs_sync_conn) + sizeof(struct ip_vs_sync_conn_options)) |
| 78 | |
| 79 | |
| 80 | /* |
| 81 | The master mulitcasts messages to the backup load balancers in the |
| 82 | following format. |
| 83 | |
| 84 | 0 1 2 3 |
| 85 | 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 |
| 86 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 87 | | Count Conns | SyncID | Size | |
| 88 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 89 | | | |
| 90 | | IPVS Sync Connection (1) | |
| 91 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 92 | | . | |
| 93 | | . | |
| 94 | | . | |
| 95 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 96 | | | |
| 97 | | IPVS Sync Connection (n) | |
| 98 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 99 | */ |
| 100 | |
| 101 | #define SYNC_MESG_HEADER_LEN 4 |
| 102 | |
| 103 | struct ip_vs_sync_mesg { |
| 104 | __u8 nr_conns; |
| 105 | __u8 syncid; |
| 106 | __u16 size; |
| 107 | |
| 108 | /* ip_vs_sync_conn entries start here */ |
| 109 | }; |
| 110 | |
| 111 | /* the maximum length of sync (sending/receiving) message */ |
| 112 | static int sync_send_mesg_maxlen; |
| 113 | static int sync_recv_mesg_maxlen; |
| 114 | |
| 115 | struct ip_vs_sync_buff { |
| 116 | struct list_head list; |
| 117 | unsigned long firstuse; |
| 118 | |
| 119 | /* pointers for the message data */ |
| 120 | struct ip_vs_sync_mesg *mesg; |
| 121 | unsigned char *head; |
| 122 | unsigned char *end; |
| 123 | }; |
| 124 | |
| 125 | |
| 126 | /* the sync_buff list head and the lock */ |
| 127 | static LIST_HEAD(ip_vs_sync_queue); |
| 128 | static DEFINE_SPINLOCK(ip_vs_sync_lock); |
| 129 | |
| 130 | /* current sync_buff for accepting new conn entries */ |
| 131 | static struct ip_vs_sync_buff *curr_sb = NULL; |
| 132 | static DEFINE_SPINLOCK(curr_sb_lock); |
| 133 | |
| 134 | /* ipvs sync daemon state */ |
| 135 | volatile int ip_vs_sync_state = IP_VS_STATE_NONE; |
| 136 | volatile int ip_vs_master_syncid = 0; |
| 137 | volatile int ip_vs_backup_syncid = 0; |
| 138 | |
| 139 | /* multicast interface name */ |
| 140 | char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; |
| 141 | char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; |
| 142 | |
| 143 | /* multicast addr */ |
| 144 | static struct sockaddr_in mcast_addr; |
| 145 | |
| 146 | |
| 147 | static inline void sb_queue_tail(struct ip_vs_sync_buff *sb) |
| 148 | { |
| 149 | spin_lock(&ip_vs_sync_lock); |
| 150 | list_add_tail(&sb->list, &ip_vs_sync_queue); |
| 151 | spin_unlock(&ip_vs_sync_lock); |
| 152 | } |
| 153 | |
| 154 | static inline struct ip_vs_sync_buff * sb_dequeue(void) |
| 155 | { |
| 156 | struct ip_vs_sync_buff *sb; |
| 157 | |
| 158 | spin_lock_bh(&ip_vs_sync_lock); |
| 159 | if (list_empty(&ip_vs_sync_queue)) { |
| 160 | sb = NULL; |
| 161 | } else { |
| 162 | sb = list_entry(ip_vs_sync_queue.next, |
| 163 | struct ip_vs_sync_buff, |
| 164 | list); |
| 165 | list_del(&sb->list); |
| 166 | } |
| 167 | spin_unlock_bh(&ip_vs_sync_lock); |
| 168 | |
| 169 | return sb; |
| 170 | } |
| 171 | |
| 172 | static inline struct ip_vs_sync_buff * ip_vs_sync_buff_create(void) |
| 173 | { |
| 174 | struct ip_vs_sync_buff *sb; |
| 175 | |
| 176 | if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC))) |
| 177 | return NULL; |
| 178 | |
| 179 | if (!(sb->mesg=kmalloc(sync_send_mesg_maxlen, GFP_ATOMIC))) { |
| 180 | kfree(sb); |
| 181 | return NULL; |
| 182 | } |
| 183 | sb->mesg->nr_conns = 0; |
| 184 | sb->mesg->syncid = ip_vs_master_syncid; |
| 185 | sb->mesg->size = 4; |
| 186 | sb->head = (unsigned char *)sb->mesg + 4; |
| 187 | sb->end = (unsigned char *)sb->mesg + sync_send_mesg_maxlen; |
| 188 | sb->firstuse = jiffies; |
| 189 | return sb; |
| 190 | } |
| 191 | |
| 192 | static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb) |
| 193 | { |
| 194 | kfree(sb->mesg); |
| 195 | kfree(sb); |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * Get the current sync buffer if it has been created for more |
| 200 | * than the specified time or the specified time is zero. |
| 201 | */ |
| 202 | static inline struct ip_vs_sync_buff * |
| 203 | get_curr_sync_buff(unsigned long time) |
| 204 | { |
| 205 | struct ip_vs_sync_buff *sb; |
| 206 | |
| 207 | spin_lock_bh(&curr_sb_lock); |
| 208 | if (curr_sb && (time == 0 || |
| 209 | time_before(jiffies - curr_sb->firstuse, time))) { |
| 210 | sb = curr_sb; |
| 211 | curr_sb = NULL; |
| 212 | } else |
| 213 | sb = NULL; |
| 214 | spin_unlock_bh(&curr_sb_lock); |
| 215 | return sb; |
| 216 | } |
| 217 | |
| 218 | |
| 219 | /* |
| 220 | * Add an ip_vs_conn information into the current sync_buff. |
| 221 | * Called by ip_vs_in. |
| 222 | */ |
| 223 | void ip_vs_sync_conn(struct ip_vs_conn *cp) |
| 224 | { |
| 225 | struct ip_vs_sync_mesg *m; |
| 226 | struct ip_vs_sync_conn *s; |
| 227 | int len; |
| 228 | |
| 229 | spin_lock(&curr_sb_lock); |
| 230 | if (!curr_sb) { |
| 231 | if (!(curr_sb=ip_vs_sync_buff_create())) { |
| 232 | spin_unlock(&curr_sb_lock); |
| 233 | IP_VS_ERR("ip_vs_sync_buff_create failed.\n"); |
| 234 | return; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE : |
| 239 | SIMPLE_CONN_SIZE; |
| 240 | m = curr_sb->mesg; |
| 241 | s = (struct ip_vs_sync_conn *)curr_sb->head; |
| 242 | |
| 243 | /* copy members */ |
| 244 | s->protocol = cp->protocol; |
| 245 | s->cport = cp->cport; |
| 246 | s->vport = cp->vport; |
| 247 | s->dport = cp->dport; |
| 248 | s->caddr = cp->caddr; |
| 249 | s->vaddr = cp->vaddr; |
| 250 | s->daddr = cp->daddr; |
| 251 | s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED); |
| 252 | s->state = htons(cp->state); |
| 253 | if (cp->flags & IP_VS_CONN_F_SEQ_MASK) { |
| 254 | struct ip_vs_sync_conn_options *opt = |
| 255 | (struct ip_vs_sync_conn_options *)&s[1]; |
| 256 | memcpy(opt, &cp->in_seq, sizeof(*opt)); |
| 257 | } |
| 258 | |
| 259 | m->nr_conns++; |
| 260 | m->size += len; |
| 261 | curr_sb->head += len; |
| 262 | |
| 263 | /* check if there is a space for next one */ |
| 264 | if (curr_sb->head+FULL_CONN_SIZE > curr_sb->end) { |
| 265 | sb_queue_tail(curr_sb); |
| 266 | curr_sb = NULL; |
| 267 | } |
| 268 | spin_unlock(&curr_sb_lock); |
| 269 | |
| 270 | /* synchronize its controller if it has */ |
| 271 | if (cp->control) |
| 272 | ip_vs_sync_conn(cp->control); |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /* |
| 277 | * Process received multicast message and create the corresponding |
| 278 | * ip_vs_conn entries. |
| 279 | */ |
| 280 | static void ip_vs_process_message(const char *buffer, const size_t buflen) |
| 281 | { |
| 282 | struct ip_vs_sync_mesg *m = (struct ip_vs_sync_mesg *)buffer; |
| 283 | struct ip_vs_sync_conn *s; |
| 284 | struct ip_vs_sync_conn_options *opt; |
| 285 | struct ip_vs_conn *cp; |
Andy Gospodarek | 5c81833 | 2007-10-29 04:35:45 -0700 | [diff] [blame] | 286 | struct ip_vs_protocol *pp; |
Rumen G. Bogdanovski | 1e356f9 | 2007-11-07 02:35:54 -0800 | [diff] [blame] | 287 | struct ip_vs_dest *dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | char *p; |
| 289 | int i; |
| 290 | |
| 291 | /* Convert size back to host byte order */ |
| 292 | m->size = ntohs(m->size); |
| 293 | |
| 294 | if (buflen != m->size) { |
| 295 | IP_VS_ERR("bogus message\n"); |
| 296 | return; |
| 297 | } |
| 298 | |
| 299 | /* SyncID sanity check */ |
| 300 | if (ip_vs_backup_syncid != 0 && m->syncid != ip_vs_backup_syncid) { |
| 301 | IP_VS_DBG(7, "Ignoring incoming msg with syncid = %d\n", |
| 302 | m->syncid); |
| 303 | return; |
| 304 | } |
| 305 | |
| 306 | p = (char *)buffer + sizeof(struct ip_vs_sync_mesg); |
| 307 | for (i=0; i<m->nr_conns; i++) { |
Rumen G. Bogdanovski | b209639 | 2007-11-19 21:53:27 -0800 | [diff] [blame^] | 308 | unsigned flags, state; |
Julian Anastasov | 87375ab | 2005-09-14 21:08:51 -0700 | [diff] [blame] | 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | s = (struct ip_vs_sync_conn *)p; |
Rumen G. Bogdanovski | 7a4fbb1 | 2007-11-19 21:52:42 -0800 | [diff] [blame] | 311 | flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC; |
Rumen G. Bogdanovski | b209639 | 2007-11-19 21:53:27 -0800 | [diff] [blame^] | 312 | state = ntohs(s->state); |
Julian Anastasov | 87375ab | 2005-09-14 21:08:51 -0700 | [diff] [blame] | 313 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) |
| 314 | cp = ip_vs_conn_in_get(s->protocol, |
| 315 | s->caddr, s->cport, |
| 316 | s->vaddr, s->vport); |
| 317 | else |
| 318 | cp = ip_vs_ct_in_get(s->protocol, |
| 319 | s->caddr, s->cport, |
| 320 | s->vaddr, s->vport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | if (!cp) { |
Rumen G. Bogdanovski | 1e356f9 | 2007-11-07 02:35:54 -0800 | [diff] [blame] | 322 | /* |
| 323 | * Find the appropriate destination for the connection. |
| 324 | * If it is not found the connection will remain unbound |
| 325 | * but still handled. |
| 326 | */ |
| 327 | dest = ip_vs_find_dest(s->daddr, s->dport, |
| 328 | s->vaddr, s->vport, |
| 329 | s->protocol); |
Rumen G. Bogdanovski | b209639 | 2007-11-19 21:53:27 -0800 | [diff] [blame^] | 330 | /* Set the approprite ativity flag */ |
| 331 | if (s->protocol == IPPROTO_TCP) { |
| 332 | if (state != IP_VS_TCP_S_ESTABLISHED) |
| 333 | flags |= IP_VS_CONN_F_INACTIVE; |
| 334 | else |
| 335 | flags &= ~IP_VS_CONN_F_INACTIVE; |
| 336 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | cp = ip_vs_conn_new(s->protocol, |
| 338 | s->caddr, s->cport, |
| 339 | s->vaddr, s->vport, |
| 340 | s->daddr, s->dport, |
Rumen G. Bogdanovski | 1e356f9 | 2007-11-07 02:35:54 -0800 | [diff] [blame] | 341 | flags, dest); |
| 342 | if (dest) |
| 343 | atomic_dec(&dest->refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | if (!cp) { |
| 345 | IP_VS_ERR("ip_vs_conn_new failed\n"); |
| 346 | return; |
| 347 | } |
Rumen G. Bogdanovski | b209639 | 2007-11-19 21:53:27 -0800 | [diff] [blame^] | 348 | cp->state = state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } else if (!cp->dest) { |
Rumen G. Bogdanovski | 1e356f9 | 2007-11-07 02:35:54 -0800 | [diff] [blame] | 350 | dest = ip_vs_try_bind_dest(cp); |
| 351 | if (!dest) { |
| 352 | /* it is an unbound entry created by |
| 353 | * synchronization */ |
Rumen G. Bogdanovski | 1e356f9 | 2007-11-07 02:35:54 -0800 | [diff] [blame] | 354 | cp->flags = flags | IP_VS_CONN_F_HASHED; |
| 355 | } else |
| 356 | atomic_dec(&dest->refcnt); |
Rumen G. Bogdanovski | b209639 | 2007-11-19 21:53:27 -0800 | [diff] [blame^] | 357 | } else if ((cp->dest) && (cp->protocol == IPPROTO_TCP) && |
| 358 | (cp->state != state)) { |
| 359 | /* update active/inactive flag for the connection */ |
| 360 | dest = cp->dest; |
| 361 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 362 | (state != IP_VS_TCP_S_ESTABLISHED)) { |
| 363 | atomic_dec(&dest->activeconns); |
| 364 | atomic_inc(&dest->inactconns); |
| 365 | cp->flags |= IP_VS_CONN_F_INACTIVE; |
| 366 | } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 367 | (state == IP_VS_TCP_S_ESTABLISHED)) { |
| 368 | atomic_inc(&dest->activeconns); |
| 369 | atomic_dec(&dest->inactconns); |
| 370 | cp->flags &= ~IP_VS_CONN_F_INACTIVE; |
| 371 | } |
| 372 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Julian Anastasov | 87375ab | 2005-09-14 21:08:51 -0700 | [diff] [blame] | 374 | if (flags & IP_VS_CONN_F_SEQ_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | opt = (struct ip_vs_sync_conn_options *)&s[1]; |
| 376 | memcpy(&cp->in_seq, opt, sizeof(*opt)); |
| 377 | p += FULL_CONN_SIZE; |
| 378 | } else |
| 379 | p += SIMPLE_CONN_SIZE; |
| 380 | |
| 381 | atomic_set(&cp->in_pkts, sysctl_ip_vs_sync_threshold[0]); |
Rumen G. Bogdanovski | b209639 | 2007-11-19 21:53:27 -0800 | [diff] [blame^] | 382 | cp->state = state; |
Andy Gospodarek | 5c81833 | 2007-10-29 04:35:45 -0700 | [diff] [blame] | 383 | pp = ip_vs_proto_get(s->protocol); |
| 384 | cp->timeout = pp->timeout_table[cp->state]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | ip_vs_conn_put(cp); |
| 386 | |
| 387 | if (p > buffer+buflen) { |
| 388 | IP_VS_ERR("bogus message\n"); |
| 389 | return; |
| 390 | } |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | |
| 395 | /* |
| 396 | * Setup loopback of outgoing multicasts on a sending socket |
| 397 | */ |
| 398 | static void set_mcast_loop(struct sock *sk, u_char loop) |
| 399 | { |
| 400 | struct inet_sock *inet = inet_sk(sk); |
| 401 | |
| 402 | /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */ |
| 403 | lock_sock(sk); |
| 404 | inet->mc_loop = loop ? 1 : 0; |
| 405 | release_sock(sk); |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Specify TTL for outgoing multicasts on a sending socket |
| 410 | */ |
| 411 | static void set_mcast_ttl(struct sock *sk, u_char ttl) |
| 412 | { |
| 413 | struct inet_sock *inet = inet_sk(sk); |
| 414 | |
| 415 | /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */ |
| 416 | lock_sock(sk); |
| 417 | inet->mc_ttl = ttl; |
| 418 | release_sock(sk); |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Specifiy default interface for outgoing multicasts |
| 423 | */ |
| 424 | static int set_mcast_if(struct sock *sk, char *ifname) |
| 425 | { |
| 426 | struct net_device *dev; |
| 427 | struct inet_sock *inet = inet_sk(sk); |
| 428 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 429 | if ((dev = __dev_get_by_name(&init_net, ifname)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | return -ENODEV; |
| 431 | |
| 432 | if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) |
| 433 | return -EINVAL; |
| 434 | |
| 435 | lock_sock(sk); |
| 436 | inet->mc_index = dev->ifindex; |
| 437 | /* inet->mc_addr = 0; */ |
| 438 | release_sock(sk); |
| 439 | |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | |
| 444 | /* |
| 445 | * Set the maximum length of sync message according to the |
| 446 | * specified interface's MTU. |
| 447 | */ |
| 448 | static int set_sync_mesg_maxlen(int sync_state) |
| 449 | { |
| 450 | struct net_device *dev; |
| 451 | int num; |
| 452 | |
| 453 | if (sync_state == IP_VS_STATE_MASTER) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 454 | if ((dev = __dev_get_by_name(&init_net, ip_vs_master_mcast_ifn)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | return -ENODEV; |
| 456 | |
| 457 | num = (dev->mtu - sizeof(struct iphdr) - |
| 458 | sizeof(struct udphdr) - |
| 459 | SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE; |
| 460 | sync_send_mesg_maxlen = |
| 461 | SYNC_MESG_HEADER_LEN + SIMPLE_CONN_SIZE * num; |
| 462 | IP_VS_DBG(7, "setting the maximum length of sync sending " |
| 463 | "message %d.\n", sync_send_mesg_maxlen); |
| 464 | } else if (sync_state == IP_VS_STATE_BACKUP) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 465 | if ((dev = __dev_get_by_name(&init_net, ip_vs_backup_mcast_ifn)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | return -ENODEV; |
| 467 | |
| 468 | sync_recv_mesg_maxlen = dev->mtu - |
| 469 | sizeof(struct iphdr) - sizeof(struct udphdr); |
| 470 | IP_VS_DBG(7, "setting the maximum length of sync receiving " |
| 471 | "message %d.\n", sync_recv_mesg_maxlen); |
| 472 | } |
| 473 | |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | |
| 478 | /* |
| 479 | * Join a multicast group. |
| 480 | * the group is specified by a class D multicast address 224.0.0.0/8 |
| 481 | * in the in_addr structure passed in as a parameter. |
| 482 | */ |
| 483 | static int |
| 484 | join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname) |
| 485 | { |
| 486 | struct ip_mreqn mreq; |
| 487 | struct net_device *dev; |
| 488 | int ret; |
| 489 | |
| 490 | memset(&mreq, 0, sizeof(mreq)); |
| 491 | memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr)); |
| 492 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 493 | if ((dev = __dev_get_by_name(&init_net, ifname)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | return -ENODEV; |
| 495 | if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) |
| 496 | return -EINVAL; |
| 497 | |
| 498 | mreq.imr_ifindex = dev->ifindex; |
| 499 | |
| 500 | lock_sock(sk); |
| 501 | ret = ip_mc_join_group(sk, &mreq); |
| 502 | release_sock(sk); |
| 503 | |
| 504 | return ret; |
| 505 | } |
| 506 | |
| 507 | |
| 508 | static int bind_mcastif_addr(struct socket *sock, char *ifname) |
| 509 | { |
| 510 | struct net_device *dev; |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 511 | __be32 addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | struct sockaddr_in sin; |
| 513 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 514 | if ((dev = __dev_get_by_name(&init_net, ifname)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | return -ENODEV; |
| 516 | |
| 517 | addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
| 518 | if (!addr) |
| 519 | IP_VS_ERR("You probably need to specify IP address on " |
| 520 | "multicast interface.\n"); |
| 521 | |
| 522 | IP_VS_DBG(7, "binding socket with (%s) %u.%u.%u.%u\n", |
| 523 | ifname, NIPQUAD(addr)); |
| 524 | |
| 525 | /* Now bind the socket with the address of multicast interface */ |
| 526 | sin.sin_family = AF_INET; |
| 527 | sin.sin_addr.s_addr = addr; |
| 528 | sin.sin_port = 0; |
| 529 | |
| 530 | return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin)); |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * Set up sending multicast socket over UDP |
| 535 | */ |
| 536 | static struct socket * make_send_sock(void) |
| 537 | { |
| 538 | struct socket *sock; |
| 539 | |
| 540 | /* First create a socket */ |
| 541 | if (sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock) < 0) { |
| 542 | IP_VS_ERR("Error during creation of socket; terminating\n"); |
| 543 | return NULL; |
| 544 | } |
| 545 | |
| 546 | if (set_mcast_if(sock->sk, ip_vs_master_mcast_ifn) < 0) { |
| 547 | IP_VS_ERR("Error setting outbound mcast interface\n"); |
| 548 | goto error; |
| 549 | } |
| 550 | |
| 551 | set_mcast_loop(sock->sk, 0); |
| 552 | set_mcast_ttl(sock->sk, 1); |
| 553 | |
| 554 | if (bind_mcastif_addr(sock, ip_vs_master_mcast_ifn) < 0) { |
| 555 | IP_VS_ERR("Error binding address of the mcast interface\n"); |
| 556 | goto error; |
| 557 | } |
| 558 | |
| 559 | if (sock->ops->connect(sock, |
| 560 | (struct sockaddr*)&mcast_addr, |
| 561 | sizeof(struct sockaddr), 0) < 0) { |
| 562 | IP_VS_ERR("Error connecting to the multicast addr\n"); |
| 563 | goto error; |
| 564 | } |
| 565 | |
| 566 | return sock; |
| 567 | |
| 568 | error: |
| 569 | sock_release(sock); |
| 570 | return NULL; |
| 571 | } |
| 572 | |
| 573 | |
| 574 | /* |
| 575 | * Set up receiving multicast socket over UDP |
| 576 | */ |
| 577 | static struct socket * make_receive_sock(void) |
| 578 | { |
| 579 | struct socket *sock; |
| 580 | |
| 581 | /* First create a socket */ |
| 582 | if (sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock) < 0) { |
| 583 | IP_VS_ERR("Error during creation of socket; terminating\n"); |
| 584 | return NULL; |
| 585 | } |
| 586 | |
| 587 | /* it is equivalent to the REUSEADDR option in user-space */ |
| 588 | sock->sk->sk_reuse = 1; |
| 589 | |
| 590 | if (sock->ops->bind(sock, |
| 591 | (struct sockaddr*)&mcast_addr, |
| 592 | sizeof(struct sockaddr)) < 0) { |
| 593 | IP_VS_ERR("Error binding to the multicast addr\n"); |
| 594 | goto error; |
| 595 | } |
| 596 | |
| 597 | /* join the multicast group */ |
| 598 | if (join_mcast_group(sock->sk, |
| 599 | (struct in_addr*)&mcast_addr.sin_addr, |
| 600 | ip_vs_backup_mcast_ifn) < 0) { |
| 601 | IP_VS_ERR("Error joining to the multicast group\n"); |
| 602 | goto error; |
| 603 | } |
| 604 | |
| 605 | return sock; |
| 606 | |
| 607 | error: |
| 608 | sock_release(sock); |
| 609 | return NULL; |
| 610 | } |
| 611 | |
| 612 | |
| 613 | static int |
| 614 | ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length) |
| 615 | { |
| 616 | struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL}; |
| 617 | struct kvec iov; |
| 618 | int len; |
| 619 | |
| 620 | EnterFunction(7); |
| 621 | iov.iov_base = (void *)buffer; |
| 622 | iov.iov_len = length; |
| 623 | |
| 624 | len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length)); |
| 625 | |
| 626 | LeaveFunction(7); |
| 627 | return len; |
| 628 | } |
| 629 | |
| 630 | static void |
| 631 | ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg) |
| 632 | { |
| 633 | int msize; |
| 634 | |
| 635 | msize = msg->size; |
| 636 | |
| 637 | /* Put size in network byte order */ |
| 638 | msg->size = htons(msg->size); |
| 639 | |
| 640 | if (ip_vs_send_async(sock, (char *)msg, msize) != msize) |
| 641 | IP_VS_ERR("ip_vs_send_async error\n"); |
| 642 | } |
| 643 | |
| 644 | static int |
| 645 | ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen) |
| 646 | { |
| 647 | struct msghdr msg = {NULL,}; |
| 648 | struct kvec iov; |
| 649 | int len; |
| 650 | |
| 651 | EnterFunction(7); |
| 652 | |
| 653 | /* Receive a packet */ |
| 654 | iov.iov_base = buffer; |
| 655 | iov.iov_len = (size_t)buflen; |
| 656 | |
| 657 | len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, 0); |
| 658 | |
| 659 | if (len < 0) |
| 660 | return -1; |
| 661 | |
| 662 | LeaveFunction(7); |
| 663 | return len; |
| 664 | } |
| 665 | |
| 666 | |
| 667 | static DECLARE_WAIT_QUEUE_HEAD(sync_wait); |
| 668 | static pid_t sync_master_pid = 0; |
| 669 | static pid_t sync_backup_pid = 0; |
| 670 | |
| 671 | static DECLARE_WAIT_QUEUE_HEAD(stop_sync_wait); |
| 672 | static int stop_master_sync = 0; |
| 673 | static int stop_backup_sync = 0; |
| 674 | |
| 675 | static void sync_master_loop(void) |
| 676 | { |
| 677 | struct socket *sock; |
| 678 | struct ip_vs_sync_buff *sb; |
| 679 | |
| 680 | /* create the sending multicast socket */ |
| 681 | sock = make_send_sock(); |
| 682 | if (!sock) |
| 683 | return; |
| 684 | |
| 685 | IP_VS_INFO("sync thread started: state = MASTER, mcast_ifn = %s, " |
| 686 | "syncid = %d\n", |
| 687 | ip_vs_master_mcast_ifn, ip_vs_master_syncid); |
| 688 | |
| 689 | for (;;) { |
| 690 | while ((sb=sb_dequeue())) { |
| 691 | ip_vs_send_sync_msg(sock, sb->mesg); |
| 692 | ip_vs_sync_buff_release(sb); |
| 693 | } |
| 694 | |
| 695 | /* check if entries stay in curr_sb for 2 seconds */ |
| 696 | if ((sb = get_curr_sync_buff(2*HZ))) { |
| 697 | ip_vs_send_sync_msg(sock, sb->mesg); |
| 698 | ip_vs_sync_buff_release(sb); |
| 699 | } |
| 700 | |
| 701 | if (stop_master_sync) |
| 702 | break; |
| 703 | |
Simon Horman | 89eaeb0 | 2006-12-10 22:35:24 -0800 | [diff] [blame] | 704 | msleep_interruptible(1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
| 706 | |
| 707 | /* clean up the sync_buff queue */ |
| 708 | while ((sb=sb_dequeue())) { |
| 709 | ip_vs_sync_buff_release(sb); |
| 710 | } |
| 711 | |
| 712 | /* clean up the current sync_buff */ |
| 713 | if ((sb = get_curr_sync_buff(0))) { |
| 714 | ip_vs_sync_buff_release(sb); |
| 715 | } |
| 716 | |
| 717 | /* release the sending multicast socket */ |
| 718 | sock_release(sock); |
| 719 | } |
| 720 | |
| 721 | |
| 722 | static void sync_backup_loop(void) |
| 723 | { |
| 724 | struct socket *sock; |
| 725 | char *buf; |
| 726 | int len; |
| 727 | |
| 728 | if (!(buf = kmalloc(sync_recv_mesg_maxlen, GFP_ATOMIC))) { |
| 729 | IP_VS_ERR("sync_backup_loop: kmalloc error\n"); |
| 730 | return; |
| 731 | } |
| 732 | |
| 733 | /* create the receiving multicast socket */ |
| 734 | sock = make_receive_sock(); |
| 735 | if (!sock) |
| 736 | goto out; |
| 737 | |
| 738 | IP_VS_INFO("sync thread started: state = BACKUP, mcast_ifn = %s, " |
| 739 | "syncid = %d\n", |
| 740 | ip_vs_backup_mcast_ifn, ip_vs_backup_syncid); |
| 741 | |
| 742 | for (;;) { |
| 743 | /* do you have data now? */ |
| 744 | while (!skb_queue_empty(&(sock->sk->sk_receive_queue))) { |
| 745 | if ((len = |
| 746 | ip_vs_receive(sock, buf, |
| 747 | sync_recv_mesg_maxlen)) <= 0) { |
| 748 | IP_VS_ERR("receiving message error\n"); |
| 749 | break; |
| 750 | } |
| 751 | /* disable bottom half, because it accessed the data |
| 752 | shared by softirq while getting/creating conns */ |
| 753 | local_bh_disable(); |
| 754 | ip_vs_process_message(buf, len); |
| 755 | local_bh_enable(); |
| 756 | } |
| 757 | |
| 758 | if (stop_backup_sync) |
| 759 | break; |
| 760 | |
Simon Horman | 89eaeb0 | 2006-12-10 22:35:24 -0800 | [diff] [blame] | 761 | msleep_interruptible(1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | /* release the sending multicast socket */ |
| 765 | sock_release(sock); |
| 766 | |
| 767 | out: |
| 768 | kfree(buf); |
| 769 | } |
| 770 | |
| 771 | |
| 772 | static void set_sync_pid(int sync_state, pid_t sync_pid) |
| 773 | { |
| 774 | if (sync_state == IP_VS_STATE_MASTER) |
| 775 | sync_master_pid = sync_pid; |
| 776 | else if (sync_state == IP_VS_STATE_BACKUP) |
| 777 | sync_backup_pid = sync_pid; |
| 778 | } |
| 779 | |
| 780 | static void set_stop_sync(int sync_state, int set) |
| 781 | { |
| 782 | if (sync_state == IP_VS_STATE_MASTER) |
| 783 | stop_master_sync = set; |
| 784 | else if (sync_state == IP_VS_STATE_BACKUP) |
| 785 | stop_backup_sync = set; |
| 786 | else { |
| 787 | stop_master_sync = set; |
| 788 | stop_backup_sync = set; |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | static int sync_thread(void *startup) |
| 793 | { |
| 794 | DECLARE_WAITQUEUE(wait, current); |
| 795 | mm_segment_t oldmm; |
| 796 | int state; |
| 797 | const char *name; |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 798 | struct ip_vs_sync_thread_data *tinfo = startup; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
| 800 | /* increase the module use count */ |
| 801 | ip_vs_use_count_inc(); |
| 802 | |
| 803 | if (ip_vs_sync_state & IP_VS_STATE_MASTER && !sync_master_pid) { |
| 804 | state = IP_VS_STATE_MASTER; |
| 805 | name = "ipvs_syncmaster"; |
| 806 | } else if (ip_vs_sync_state & IP_VS_STATE_BACKUP && !sync_backup_pid) { |
| 807 | state = IP_VS_STATE_BACKUP; |
| 808 | name = "ipvs_syncbackup"; |
| 809 | } else { |
| 810 | IP_VS_BUG(); |
| 811 | ip_vs_use_count_dec(); |
| 812 | return -EINVAL; |
| 813 | } |
| 814 | |
| 815 | daemonize(name); |
| 816 | |
| 817 | oldmm = get_fs(); |
| 818 | set_fs(KERNEL_DS); |
| 819 | |
| 820 | /* Block all signals */ |
| 821 | spin_lock_irq(¤t->sighand->siglock); |
| 822 | siginitsetinv(¤t->blocked, 0); |
| 823 | recalc_sigpending(); |
| 824 | spin_unlock_irq(¤t->sighand->siglock); |
| 825 | |
| 826 | /* set the maximum length of sync message */ |
| 827 | set_sync_mesg_maxlen(state); |
| 828 | |
| 829 | /* set up multicast address */ |
| 830 | mcast_addr.sin_family = AF_INET; |
| 831 | mcast_addr.sin_port = htons(IP_VS_SYNC_PORT); |
| 832 | mcast_addr.sin_addr.s_addr = htonl(IP_VS_SYNC_GROUP); |
| 833 | |
| 834 | add_wait_queue(&sync_wait, &wait); |
| 835 | |
Pavel Emelyanov | 6651fd5 | 2007-10-18 23:40:43 -0700 | [diff] [blame] | 836 | set_sync_pid(state, task_pid_nr(current)); |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 837 | complete(tinfo->startup); |
| 838 | |
| 839 | /* |
| 840 | * once we call the completion queue above, we should |
| 841 | * null out that reference, since its allocated on the |
| 842 | * stack of the creating kernel thread |
| 843 | */ |
| 844 | tinfo->startup = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | /* processing master/backup loop here */ |
| 847 | if (state == IP_VS_STATE_MASTER) |
| 848 | sync_master_loop(); |
| 849 | else if (state == IP_VS_STATE_BACKUP) |
| 850 | sync_backup_loop(); |
| 851 | else IP_VS_BUG(); |
| 852 | |
| 853 | remove_wait_queue(&sync_wait, &wait); |
| 854 | |
| 855 | /* thread exits */ |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 856 | |
| 857 | /* |
| 858 | * If we weren't explicitly stopped, then we |
| 859 | * exited in error, and should undo our state |
| 860 | */ |
| 861 | if ((!stop_master_sync) && (!stop_backup_sync)) |
| 862 | ip_vs_sync_state -= tinfo->state; |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | set_sync_pid(state, 0); |
| 865 | IP_VS_INFO("sync thread stopped!\n"); |
| 866 | |
| 867 | set_fs(oldmm); |
| 868 | |
| 869 | /* decrease the module use count */ |
| 870 | ip_vs_use_count_dec(); |
| 871 | |
| 872 | set_stop_sync(state, 0); |
| 873 | wake_up(&stop_sync_wait); |
| 874 | |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 875 | /* |
| 876 | * we need to free the structure that was allocated |
| 877 | * for us in start_sync_thread |
| 878 | */ |
| 879 | kfree(tinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | return 0; |
| 881 | } |
| 882 | |
| 883 | |
| 884 | static int fork_sync_thread(void *startup) |
| 885 | { |
| 886 | pid_t pid; |
| 887 | |
| 888 | /* fork the sync thread here, then the parent process of the |
| 889 | sync thread is the init process after this thread exits. */ |
| 890 | repeat: |
| 891 | if ((pid = kernel_thread(sync_thread, startup, 0)) < 0) { |
| 892 | IP_VS_ERR("could not create sync_thread due to %d... " |
| 893 | "retrying.\n", pid); |
Simon Horman | 89eaeb0 | 2006-12-10 22:35:24 -0800 | [diff] [blame] | 894 | msleep_interruptible(1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | goto repeat; |
| 896 | } |
| 897 | |
| 898 | return 0; |
| 899 | } |
| 900 | |
| 901 | |
| 902 | int start_sync_thread(int state, char *mcast_ifn, __u8 syncid) |
| 903 | { |
Peter Zijlstra | 6e9a473 | 2006-09-30 23:28:10 -0700 | [diff] [blame] | 904 | DECLARE_COMPLETION_ONSTACK(startup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | pid_t pid; |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 906 | struct ip_vs_sync_thread_data *tinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | if ((state == IP_VS_STATE_MASTER && sync_master_pid) || |
| 909 | (state == IP_VS_STATE_BACKUP && sync_backup_pid)) |
| 910 | return -EEXIST; |
| 911 | |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 912 | /* |
| 913 | * Note that tinfo will be freed in sync_thread on exit |
| 914 | */ |
| 915 | tinfo = kmalloc(sizeof(struct ip_vs_sync_thread_data), GFP_KERNEL); |
| 916 | if (!tinfo) |
| 917 | return -ENOMEM; |
| 918 | |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 919 | IP_VS_DBG(7, "%s: pid %d\n", __FUNCTION__, task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | IP_VS_DBG(7, "Each ip_vs_sync_conn entry need %Zd bytes\n", |
| 921 | sizeof(struct ip_vs_sync_conn)); |
| 922 | |
| 923 | ip_vs_sync_state |= state; |
| 924 | if (state == IP_VS_STATE_MASTER) { |
Simon Horman | 37004af | 2006-12-10 22:36:18 -0800 | [diff] [blame] | 925 | strlcpy(ip_vs_master_mcast_ifn, mcast_ifn, |
| 926 | sizeof(ip_vs_master_mcast_ifn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | ip_vs_master_syncid = syncid; |
| 928 | } else { |
Simon Horman | 37004af | 2006-12-10 22:36:18 -0800 | [diff] [blame] | 929 | strlcpy(ip_vs_backup_mcast_ifn, mcast_ifn, |
| 930 | sizeof(ip_vs_backup_mcast_ifn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | ip_vs_backup_syncid = syncid; |
| 932 | } |
| 933 | |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 934 | tinfo->state = state; |
| 935 | tinfo->startup = &startup; |
| 936 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | repeat: |
Neil Horman | cc0191a | 2007-06-18 22:33:20 -0700 | [diff] [blame] | 938 | if ((pid = kernel_thread(fork_sync_thread, tinfo, 0)) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | IP_VS_ERR("could not create fork_sync_thread due to %d... " |
| 940 | "retrying.\n", pid); |
Simon Horman | 89eaeb0 | 2006-12-10 22:35:24 -0800 | [diff] [blame] | 941 | msleep_interruptible(1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | goto repeat; |
| 943 | } |
| 944 | |
| 945 | wait_for_completion(&startup); |
| 946 | |
| 947 | return 0; |
| 948 | } |
| 949 | |
| 950 | |
| 951 | int stop_sync_thread(int state) |
| 952 | { |
| 953 | DECLARE_WAITQUEUE(wait, current); |
| 954 | |
| 955 | if ((state == IP_VS_STATE_MASTER && !sync_master_pid) || |
| 956 | (state == IP_VS_STATE_BACKUP && !sync_backup_pid)) |
| 957 | return -ESRCH; |
| 958 | |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 959 | IP_VS_DBG(7, "%s: pid %d\n", __FUNCTION__, task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | IP_VS_INFO("stopping sync thread %d ...\n", |
Simon Horman | 37004af | 2006-12-10 22:36:18 -0800 | [diff] [blame] | 961 | (state == IP_VS_STATE_MASTER) ? |
| 962 | sync_master_pid : sync_backup_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
| 964 | __set_current_state(TASK_UNINTERRUPTIBLE); |
| 965 | add_wait_queue(&stop_sync_wait, &wait); |
| 966 | set_stop_sync(state, 1); |
| 967 | ip_vs_sync_state -= state; |
| 968 | wake_up(&sync_wait); |
| 969 | schedule(); |
| 970 | __set_current_state(TASK_RUNNING); |
| 971 | remove_wait_queue(&stop_sync_wait, &wait); |
| 972 | |
| 973 | /* Note: no need to reap the sync thread, because its parent |
| 974 | process is the init process */ |
| 975 | |
| 976 | if ((state == IP_VS_STATE_MASTER && stop_master_sync) || |
| 977 | (state == IP_VS_STATE_BACKUP && stop_backup_sync)) |
| 978 | IP_VS_BUG(); |
| 979 | |
| 980 | return 0; |
| 981 | } |