net/netfilter/ipvs/ip_vs_sync.c

   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 netns_ipvs *ipvs;
 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 union ipvs_sockaddr {
 266         struct sockaddr_in      in;
 267         struct sockaddr_in6     in6;
 268 };
 269
 270 struct ip_vs_sync_buff {
 271         struct list_head        list;
 272         unsigned long           firstuse;
 273
 274         /* pointers for the message data */
 275         struct ip_vs_sync_mesg  *mesg;
 276         unsigned char           *head;
 277         unsigned char           *end;
 278 };
 279
 280 /*
 281  * Copy of struct ip_vs_seq
 282  * From unaligned network order to aligned host order
 283  */
 284 static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho)
 285 {
 286         memset(ho, 0, sizeof(*ho));
 287         ho->init_seq       = get_unaligned_be32(&no->init_seq);
 288         ho->delta          = get_unaligned_be32(&no->delta);
 289         ho->previous_delta = get_unaligned_be32(&no->previous_delta);
 290 }
 291
 292 /*
 293  * Copy of struct ip_vs_seq
 294  * From Aligned host order to unaligned network order
 295  */
 296 static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no)
 297 {
 298         put_unaligned_be32(ho->init_seq, &no->init_seq);
 299         put_unaligned_be32(ho->delta, &no->delta);
 300         put_unaligned_be32(ho->previous_delta, &no->previous_delta);
 301 }
 302
 303 static inline struct ip_vs_sync_buff *
 304 sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
 305 {
 306         struct ip_vs_sync_buff *sb;
 307
 308         spin_lock_bh(&ipvs->sync_lock);
 309         if (list_empty(&ms->sync_queue)) {
 310                 sb = NULL;
 311                 __set_current_state(TASK_INTERRUPTIBLE);
 312         } else {
 313                 sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff,
 314                                 list);
 315                 list_del(&sb->list);
 316                 ms->sync_queue_len--;
 317                 if (!ms->sync_queue_len)
 318                         ms->sync_queue_delay = 0;
 319         }
 320         spin_unlock_bh(&ipvs->sync_lock);
 321
 322         return sb;
 323 }
 324
 325 /*
 326  * Create a new sync buffer for Version 1 proto.
 327  */
 328 static inline struct ip_vs_sync_buff *
 329 ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
 330 {
 331         struct ip_vs_sync_buff *sb;
 332
 333         if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
 334                 return NULL;
 335
 336         len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
 337                     ipvs->mcfg.sync_maxlen);
 338         sb->mesg = kmalloc(len, GFP_ATOMIC);
 339         if (!sb->mesg) {
 340                 kfree(sb);
 341                 return NULL;
 342         }
 343         sb->mesg->reserved = 0;  /* old nr_conns i.e. must be zero now */
 344         sb->mesg->version = SYNC_PROTO_VER;
 345         sb->mesg->syncid = ipvs->mcfg.syncid;
 346         sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
 347         sb->mesg->nr_conns = 0;
 348         sb->mesg->spare = 0;
 349         sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
 350         sb->end = (unsigned char *)sb->mesg + len;
 351
 352         sb->firstuse = jiffies;
 353         return sb;
 354 }
 355
 356 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
 357 {
 358         kfree(sb->mesg);
 359         kfree(sb);
 360 }
 361
 362 static inline void sb_queue_tail(struct netns_ipvs *ipvs,
 363                                  struct ipvs_master_sync_state *ms)
 364 {
 365         struct ip_vs_sync_buff *sb = ms->sync_buff;
 366
 367         spin_lock(&ipvs->sync_lock);
 368         if (ipvs->sync_state & IP_VS_STATE_MASTER &&
 369             ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) {
 370                 if (!ms->sync_queue_len)
 371                         schedule_delayed_work(&ms->master_wakeup_work,
 372                                               max(IPVS_SYNC_SEND_DELAY, 1));
 373                 ms->sync_queue_len++;
 374                 list_add_tail(&sb->list, &ms->sync_queue);
 375                 if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE)
 376                         wake_up_process(ms->master_thread);
 377         } else
 378                 ip_vs_sync_buff_release(sb);
 379         spin_unlock(&ipvs->sync_lock);
 380 }
 381
 382 /*
 383  *      Get the current sync buffer if it has been created for more
 384  *      than the specified time or the specified time is zero.
 385  */
 386 static inline struct ip_vs_sync_buff *
 387 get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms,
 388                    unsigned long time)
 389 {
 390         struct ip_vs_sync_buff *sb;
 391
 392         spin_lock_bh(&ipvs->sync_buff_lock);
 393         sb = ms->sync_buff;
 394         if (sb && time_after_eq(jiffies - sb->firstuse, time)) {
 395                 ms->sync_buff = NULL;
 396                 __set_current_state(TASK_RUNNING);
 397         } else
 398                 sb = NULL;
 399         spin_unlock_bh(&ipvs->sync_buff_lock);
 400         return sb;
 401 }
 402
 403 static inline int
 404 select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
 405 {
 406         return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask;
 407 }
 408
 409 /*
 410  * Create a new sync buffer for Version 0 proto.
 411  */
 412 static inline struct ip_vs_sync_buff *
 413 ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
 414 {
 415         struct ip_vs_sync_buff *sb;
 416         struct ip_vs_sync_mesg_v0 *mesg;
 417
 418         if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
 419                 return NULL;
 420
 421         len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
 422                     ipvs->mcfg.sync_maxlen);
 423         sb->mesg = kmalloc(len, GFP_ATOMIC);
 424         if (!sb->mesg) {
 425                 kfree(sb);
 426                 return NULL;
 427         }
 428         mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
 429         mesg->nr_conns = 0;
 430         mesg->syncid = ipvs->mcfg.syncid;
 431         mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
 432         sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
 433         sb->end = (unsigned char *)mesg + len;
 434         sb->firstuse = jiffies;
 435         return sb;
 436 }
 437
 438 /* Check if connection is controlled by persistence */
 439 static inline bool in_persistence(struct ip_vs_conn *cp)
 440 {
 441         for (cp = cp->control; cp; cp = cp->control) {
 442                 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
 443                         return true;
 444         }
 445         return false;
 446 }
 447
 448 /* Check if conn should be synced.
 449  * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
 450  * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
 451  *      sync_retries times with period of sync_refresh_period/8
 452  * - (2) if both sync_refresh_period and sync_period are 0 send sync only
 453  *      for state changes or only once when pkts matches sync_threshold
 454  * - (3) templates: rate can be reduced only with sync_refresh_period or
 455  *      with (2)
 456  */
 457 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
 458                                   struct ip_vs_conn *cp, int pkts)
 459 {
 460         unsigned long orig = ACCESS_ONCE(cp->sync_endtime);
 461         unsigned long now = jiffies;
 462         unsigned long n = (now + cp->timeout) & ~3UL;
 463         unsigned int sync_refresh_period;
 464         int sync_period;
 465         int force;
 466
 467         /* Check if we sync in current state */
 468         if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
 469                 force = 0;
 470         else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
 471                 return 0;
 472         else if (likely(cp->protocol == IPPROTO_TCP)) {
 473                 if (!((1 << cp->state) &
 474                       ((1 << IP_VS_TCP_S_ESTABLISHED) |
 475                        (1 << IP_VS_TCP_S_FIN_WAIT) |
 476                        (1 << IP_VS_TCP_S_CLOSE) |
 477                        (1 << IP_VS_TCP_S_CLOSE_WAIT) |
 478                        (1 << IP_VS_TCP_S_TIME_WAIT))))
 479                         return 0;
 480                 force = cp->state != cp->old_state;
 481                 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
 482                         goto set;
 483         } else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
 484                 if (!((1 << cp->state) &
 485                       ((1 << IP_VS_SCTP_S_ESTABLISHED) |
 486                        (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) |
 487                        (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) |
 488                        (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) |
 489                        (1 << IP_VS_SCTP_S_CLOSED))))
 490                         return 0;
 491                 force = cp->state != cp->old_state;
 492                 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
 493                         goto set;
 494         } else {
 495                 /* UDP or another protocol with single state */
 496                 force = 0;
 497         }
 498
 499         sync_refresh_period = sysctl_sync_refresh_period(ipvs);
 500         if (sync_refresh_period > 0) {
 501                 long diff = n - orig;
 502                 long min_diff = max(cp->timeout >> 1, 10UL * HZ);
 503
 504                 /* Avoid sync if difference is below sync_refresh_period
 505                  * and below the half timeout.
 506                  */
 507                 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
 508                         int retries = orig & 3;
 509
 510                         if (retries >= sysctl_sync_retries(ipvs))
 511                                 return 0;
 512                         if (time_before(now, orig - cp->timeout +
 513                                         (sync_refresh_period >> 3)))
 514                                 return 0;
 515                         n |= retries + 1;
 516                 }
 517         }
 518         sync_period = sysctl_sync_period(ipvs);
 519         if (sync_period > 0) {
 520                 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
 521                     pkts % sync_period != sysctl_sync_threshold(ipvs))
 522                         return 0;
 523         } else if (!sync_refresh_period &&
 524                    pkts != sysctl_sync_threshold(ipvs))
 525                 return 0;
 526
 527 set:
 528         cp->old_state = cp->state;
 529         n = cmpxchg(&cp->sync_endtime, orig, n);
 530         return n == orig || force;
 531 }
 532
 533 /*
 534  *      Version 0 , could be switched in by sys_ctl.
 535  *      Add an ip_vs_conn information into the current sync_buff.
 536  */
 537 static void ip_vs_sync_conn_v0(struct netns_ipvs *ipvs, struct ip_vs_conn *cp,
 538                                int pkts)
 539 {
 540         struct ip_vs_sync_mesg_v0 *m;
 541         struct ip_vs_sync_conn_v0 *s;
 542         struct ip_vs_sync_buff *buff;
 543         struct ipvs_master_sync_state *ms;
 544         int id;
 545         unsigned int len;
 546
 547         if (unlikely(cp->af != AF_INET))
 548                 return;
 549         /* Do not sync ONE PACKET */
 550         if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
 551                 return;
 552
 553         if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
 554                 return;
 555
 556         spin_lock_bh(&ipvs->sync_buff_lock);
 557         if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
 558                 spin_unlock_bh(&ipvs->sync_buff_lock);
 559                 return;
 560         }
 561
 562         id = select_master_thread_id(ipvs, cp);
 563         ms = &ipvs->ms[id];
 564         buff = ms->sync_buff;
 565         len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
 566                 SIMPLE_CONN_SIZE;
 567         if (buff) {
 568                 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
 569                 /* Send buffer if it is for v1 */
 570                 if (buff->head + len > buff->end || !m->nr_conns) {
 571                         sb_queue_tail(ipvs, ms);
 572                         ms->sync_buff = NULL;
 573                         buff = NULL;
 574                 }
 575         }
 576         if (!buff) {
 577                 buff = ip_vs_sync_buff_create_v0(ipvs, len);
 578                 if (!buff) {
 579                         spin_unlock_bh(&ipvs->sync_buff_lock);
 580                         pr_err("ip_vs_sync_buff_create failed.\n");
 581                         return;
 582                 }
 583                 ms->sync_buff = buff;
 584         }
 585
 586         m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
 587         s = (struct ip_vs_sync_conn_v0 *) buff->head;
 588
 589         /* copy members */
 590         s->reserved = 0;
 591         s->protocol = cp->protocol;
 592         s->cport = cp->cport;
 593         s->vport = cp->vport;
 594         s->dport = cp->dport;
 595         s->caddr = cp->caddr.ip;
 596         s->vaddr = cp->vaddr.ip;
 597         s->daddr = cp->daddr.ip;
 598         s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
 599         s->state = htons(cp->state);
 600         if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
 601                 struct ip_vs_sync_conn_options *opt =
 602                         (struct ip_vs_sync_conn_options *)&s[1];
 603                 memcpy(opt, &cp->in_seq, sizeof(*opt));
 604         }
 605
 606         m->nr_conns++;
 607         m->size = htons(ntohs(m->size) + len);
 608         buff->head += len;
 609         spin_unlock_bh(&ipvs->sync_buff_lock);
 610
 611         /* synchronize its controller if it has */
 612         cp = cp->control;
 613         if (cp) {
 614                 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
 615                         pkts = atomic_add_return(1, &cp->in_pkts);
 616                 else
 617                         pkts = sysctl_sync_threshold(ipvs);
 618                 ip_vs_sync_conn(ipvs, cp, pkts);
 619         }
 620 }
 621
 622 /*
 623  *      Add an ip_vs_conn information into the current sync_buff.
 624  *      Called by ip_vs_in.
 625  *      Sending Version 1 messages
 626  */
 627 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts)
 628 {
 629         struct ip_vs_sync_mesg *m;
 630         union ip_vs_sync_conn *s;
 631         struct ip_vs_sync_buff *buff;
 632         struct ipvs_master_sync_state *ms;
 633         int id;
 634         __u8 *p;
 635         unsigned int len, pe_name_len, pad;
 636
 637         /* Handle old version of the protocol */
 638         if (sysctl_sync_ver(ipvs) == 0) {
 639                 ip_vs_sync_conn_v0(ipvs, cp, pkts);
 640                 return;
 641         }
 642         /* Do not sync ONE PACKET */
 643         if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
 644                 goto control;
 645 sloop:
 646         if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
 647                 goto control;
 648
 649         /* Sanity checks */
 650         pe_name_len = 0;
 651         if (cp->pe_data_len) {
 652                 if (!cp->pe_data || !cp->dest) {
 653                         IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
 654                         return;
 655                 }
 656                 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
 657         }
 658
 659         spin_lock_bh(&ipvs->sync_buff_lock);
 660         if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
 661                 spin_unlock_bh(&ipvs->sync_buff_lock);
 662                 return;
 663         }
 664
 665         id = select_master_thread_id(ipvs, cp);
 666         ms = &ipvs->ms[id];
 667
 668 #ifdef CONFIG_IP_VS_IPV6
 669         if (cp->af == AF_INET6)
 670                 len = sizeof(struct ip_vs_sync_v6);
 671         else
 672 #endif
 673                 len = sizeof(struct ip_vs_sync_v4);
 674
 675         if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
 676                 len += sizeof(struct ip_vs_sync_conn_options) + 2;
 677
 678         if (cp->pe_data_len)
 679                 len += cp->pe_data_len + 2;     /* + Param hdr field */
 680         if (pe_name_len)
 681                 len += pe_name_len + 2;
 682
 683         /* check if there is a space for this one  */
 684         pad = 0;
 685         buff = ms->sync_buff;
 686         if (buff) {
 687                 m = buff->mesg;
 688                 pad = (4 - (size_t) buff->head) & 3;
 689                 /* Send buffer if it is for v0 */
 690                 if (buff->head + len + pad > buff->end || m->reserved) {
 691                         sb_queue_tail(ipvs, ms);
 692                         ms->sync_buff = NULL;
 693                         buff = NULL;
 694                         pad = 0;
 695                 }
 696         }
 697
 698         if (!buff) {
 699                 buff = ip_vs_sync_buff_create(ipvs, len);
 700                 if (!buff) {
 701                         spin_unlock_bh(&ipvs->sync_buff_lock);
 702                         pr_err("ip_vs_sync_buff_create failed.\n");
 703                         return;
 704                 }
 705                 ms->sync_buff = buff;
 706                 m = buff->mesg;
 707         }
 708
 709         p = buff->head;
 710         buff->head += pad + len;
 711         m->size = htons(ntohs(m->size) + pad + len);
 712         /* Add ev. padding from prev. sync_conn */
 713         while (pad--)
 714                 *(p++) = 0;
 715
 716         s = (union ip_vs_sync_conn *)p;
 717
 718         /* Set message type  & copy members */
 719         s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
 720         s->v4.ver_size = htons(len & SVER_MASK);        /* Version 0 */
 721         s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
 722         s->v4.state = htons(cp->state);
 723         s->v4.protocol = cp->protocol;
 724         s->v4.cport = cp->cport;
 725         s->v4.vport = cp->vport;
 726         s->v4.dport = cp->dport;
 727         s->v4.fwmark = htonl(cp->fwmark);
 728         s->v4.timeout = htonl(cp->timeout / HZ);
 729         m->nr_conns++;
 730
 731 #ifdef CONFIG_IP_VS_IPV6
 732         if (cp->af == AF_INET6) {
 733                 p += sizeof(struct ip_vs_sync_v6);
 734                 s->v6.caddr = cp->caddr.in6;
 735                 s->v6.vaddr = cp->vaddr.in6;
 736                 s->v6.daddr = cp->daddr.in6;
 737         } else
 738 #endif
 739         {
 740                 p += sizeof(struct ip_vs_sync_v4);      /* options ptr */
 741                 s->v4.caddr = cp->caddr.ip;
 742                 s->v4.vaddr = cp->vaddr.ip;
 743                 s->v4.daddr = cp->daddr.ip;
 744         }
 745         if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
 746                 *(p++) = IPVS_OPT_SEQ_DATA;
 747                 *(p++) = sizeof(struct ip_vs_sync_conn_options);
 748                 hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
 749                 p += sizeof(struct ip_vs_seq);
 750                 hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
 751                 p += sizeof(struct ip_vs_seq);
 752         }
 753         /* Handle pe data */
 754         if (cp->pe_data_len && cp->pe_data) {
 755                 *(p++) = IPVS_OPT_PE_DATA;
 756                 *(p++) = cp->pe_data_len;
 757                 memcpy(p, cp->pe_data, cp->pe_data_len);
 758                 p += cp->pe_data_len;
 759                 if (pe_name_len) {
 760                         /* Add PE_NAME */
 761                         *(p++) = IPVS_OPT_PE_NAME;
 762                         *(p++) = pe_name_len;
 763                         memcpy(p, cp->pe->name, pe_name_len);
 764                         p += pe_name_len;
 765                 }
 766         }
 767
 768         spin_unlock_bh(&ipvs->sync_buff_lock);
 769
 770 control:
 771         /* synchronize its controller if it has */
 772         cp = cp->control;
 773         if (!cp)
 774                 return;
 775         if (cp->flags & IP_VS_CONN_F_TEMPLATE)
 776                 pkts = atomic_add_return(1, &cp->in_pkts);
 777         else
 778                 pkts = sysctl_sync_threshold(ipvs);
 779         goto sloop;
 780 }
 781
 782 /*
 783  *  fill_param used by version 1
 784  */
 785 static inline int
 786 ip_vs_conn_fill_param_sync(struct netns_ipvs *ipvs, int af, union ip_vs_sync_conn *sc,
 787                            struct ip_vs_conn_param *p,
 788                            __u8 *pe_data, unsigned int pe_data_len,
 789                            __u8 *pe_name, unsigned int pe_name_len)
 790 {
 791 #ifdef CONFIG_IP_VS_IPV6
 792         if (af == AF_INET6)
 793                 ip_vs_conn_fill_param(ipvs, af, sc->v6.protocol,
 794                                       (const union nf_inet_addr *)&sc->v6.caddr,
 795                                       sc->v6.cport,
 796                                       (const union nf_inet_addr *)&sc->v6.vaddr,
 797                                       sc->v6.vport, p);
 798         else
 799 #endif
 800                 ip_vs_conn_fill_param(ipvs, af, sc->v4.protocol,
 801                                       (const union nf_inet_addr *)&sc->v4.caddr,
 802                                       sc->v4.cport,
 803                                       (const union nf_inet_addr *)&sc->v4.vaddr,
 804                                       sc->v4.vport, p);
 805         /* Handle pe data */
 806         if (pe_data_len) {
 807                 if (pe_name_len) {
 808                         char buff[IP_VS_PENAME_MAXLEN+1];
 809
 810                         memcpy(buff, pe_name, pe_name_len);
 811                         buff[pe_name_len]=0;
 812                         p->pe = __ip_vs_pe_getbyname(buff);
 813                         if (!p->pe) {
 814                                 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
 815                                              buff);
 816                                 return 1;
 817                         }
 818                 } else {
 819                         IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
 820                         return 1;
 821                 }
 822
 823                 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
 824                 if (!p->pe_data) {
 825                         module_put(p->pe->module);
 826                         return -ENOMEM;
 827                 }
 828                 p->pe_data_len = pe_data_len;
 829         }
 830         return 0;
 831 }
 832
 833 /*
 834  *  Connection Add / Update.
 835  *  Common for version 0 and 1 reception of backup sync_conns.
 836  *  Param: ...
 837  *         timeout is in sec.
 838  */
 839 static void ip_vs_proc_conn(struct netns_ipvs *ipvs, struct ip_vs_conn_param *param,
 840                             unsigned int flags, unsigned int state,
 841                             unsigned int protocol, unsigned int type,
 842                             const union nf_inet_addr *daddr, __be16 dport,
 843                             unsigned long timeout, __u32 fwmark,
 844                             struct ip_vs_sync_conn_options *opt)
 845 {
 846         struct ip_vs_dest *dest;
 847         struct ip_vs_conn *cp;
 848
 849         if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
 850                 cp = ip_vs_conn_in_get(param);
 851                 if (cp && ((cp->dport != dport) ||
 852                            !ip_vs_addr_equal(cp->daf, &cp->daddr, daddr))) {
 853                         if (!(flags & IP_VS_CONN_F_INACTIVE)) {
 854                                 ip_vs_conn_expire_now(cp);
 855                                 __ip_vs_conn_put(cp);
 856                                 cp = NULL;
 857                         } else {
 858                                 /* This is the expiration message for the
 859                                  * connection that was already replaced, so we
 860                                  * just ignore it.
 861                                  */
 862                                 __ip_vs_conn_put(cp);
 863                                 kfree(param->pe_data);
 864                                 return;
 865                         }
 866                 }
 867         } else {
 868                 cp = ip_vs_ct_in_get(param);
 869         }
 870
 871         if (cp) {
 872                 /* Free pe_data */
 873                 kfree(param->pe_data);
 874
 875                 dest = cp->dest;
 876                 spin_lock_bh(&cp->lock);
 877                 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
 878                     !(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
 879                         if (flags & IP_VS_CONN_F_INACTIVE) {
 880                                 atomic_dec(&dest->activeconns);
 881                                 atomic_inc(&dest->inactconns);
 882                         } else {
 883                                 atomic_inc(&dest->activeconns);
 884                                 atomic_dec(&dest->inactconns);
 885                         }
 886                 }
 887                 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
 888                 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
 889                 cp->flags = flags;
 890                 spin_unlock_bh(&cp->lock);
 891                 if (!dest)
 892                         ip_vs_try_bind_dest(cp);
 893         } else {
 894                 /*
 895                  * Find the appropriate destination for the connection.
 896                  * If it is not found the connection will remain unbound
 897                  * but still handled.
 898                  */
 899                 rcu_read_lock();
 900                 /* This function is only invoked by the synchronization
 901                  * code. We do not currently support heterogeneous pools
 902                  * with synchronization, so we can make the assumption that
 903                  * the svc_af is the same as the dest_af
 904                  */
 905                 dest = ip_vs_find_dest(ipvs, type, type, daddr, dport,
 906                                        param->vaddr, param->vport, protocol,
 907                                        fwmark, flags);
 908
 909                 cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest,
 910                                     fwmark);
 911                 rcu_read_unlock();
 912                 if (!cp) {
 913                         kfree(param->pe_data);
 914                         IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
 915                         return;
 916                 }
 917                 if (!(flags & IP_VS_CONN_F_TEMPLATE))
 918                         kfree(param->pe_data);
 919         }
 920
 921         if (opt) {
 922                 cp->in_seq = opt->in_seq;
 923                 cp->out_seq = opt->out_seq;
 924         }
 925         atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
 926         cp->state = state;
 927         cp->old_state = cp->state;
 928         /*
 929          * For Ver 0 messages style
 930          *  - Not possible to recover the right timeout for templates
 931          *  - can not find the right fwmark
 932          *    virtual service. If needed, we can do it for
 933          *    non-fwmark persistent services.
 934          * Ver 1 messages style.
 935          *  - No problem.
 936          */
 937         if (timeout) {
 938                 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
 939                         timeout = MAX_SCHEDULE_TIMEOUT / HZ;
 940                 cp->timeout = timeout*HZ;
 941         } else {
 942                 struct ip_vs_proto_data *pd;
 943
 944                 pd = ip_vs_proto_data_get(ipvs, protocol);
 945                 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
 946                         cp->timeout = pd->timeout_table[state];
 947                 else
 948                         cp->timeout = (3*60*HZ);
 949         }
 950         ip_vs_conn_put(cp);
 951 }
 952
 953 /*
 954  *  Process received multicast message for Version 0
 955  */
 956 static void ip_vs_process_message_v0(struct netns_ipvs *ipvs, const char *buffer,
 957                                      const size_t buflen)
 958 {
 959         struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
 960         struct ip_vs_sync_conn_v0 *s;
 961         struct ip_vs_sync_conn_options *opt;
 962         struct ip_vs_protocol *pp;
 963         struct ip_vs_conn_param param;
 964         char *p;
 965         int i;
 966
 967         p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
 968         for (i=0; i<m->nr_conns; i++) {
 969                 unsigned int flags, state;
 970
 971                 if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
 972                         IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
 973                         return;
 974                 }
 975                 s = (struct ip_vs_sync_conn_v0 *) p;
 976                 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
 977                 flags &= ~IP_VS_CONN_F_HASHED;
 978                 if (flags & IP_VS_CONN_F_SEQ_MASK) {
 979                         opt = (struct ip_vs_sync_conn_options *)&s[1];
 980                         p += FULL_CONN_SIZE;
 981                         if (p > buffer+buflen) {
 982                                 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
 983                                 return;
 984                         }
 985                 } else {
 986                         opt = NULL;
 987                         p += SIMPLE_CONN_SIZE;
 988                 }
 989
 990                 state = ntohs(s->state);
 991                 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
 992                         pp = ip_vs_proto_get(s->protocol);
 993                         if (!pp) {
 994                                 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
 995                                         s->protocol);
 996                                 continue;
 997                         }
 998                         if (state >= pp->num_states) {
 999                                 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
1000                                         pp->name, state);
1001                                 continue;
1002                         }
1003                 } else {
1004                         /* protocol in templates is not used for state/timeout */
1005                         if (state > 0) {
1006                                 IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n",
1007                                         state);
1008                                 state = 0;
1009                         }
1010                 }
1011
1012                 ip_vs_conn_fill_param(ipvs, AF_INET, s->protocol,
1013                                       (const union nf_inet_addr *)&s->caddr,
1014                                       s->cport,
1015                                       (const union nf_inet_addr *)&s->vaddr,
1016                                       s->vport, &param);
1017
1018                 /* Send timeout as Zero */
1019                 ip_vs_proc_conn(ipvs, &param, flags, state, s->protocol, AF_INET,
1020                                 (union nf_inet_addr *)&s->daddr, s->dport,
1021                                 0, 0, opt);
1022         }
1023 }
1024
1025 /*
1026  * Handle options
1027  */
1028 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
1029                                     __u32 *opt_flags,
1030                                     struct ip_vs_sync_conn_options *opt)
1031 {
1032         struct ip_vs_sync_conn_options *topt;
1033
1034         topt = (struct ip_vs_sync_conn_options *)p;
1035
1036         if (plen != sizeof(struct ip_vs_sync_conn_options)) {
1037                 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1038                 return -EINVAL;
1039         }
1040         if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
1041                 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1042                 return -EINVAL;
1043         }
1044         ntoh_seq(&topt->in_seq, &opt->in_seq);
1045         ntoh_seq(&topt->out_seq, &opt->out_seq);
1046         *opt_flags |= IPVS_OPT_F_SEQ_DATA;
1047         return 0;
1048 }
1049
1050 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
1051                           __u8 **data, unsigned int maxlen,
1052                           __u32 *opt_flags, __u32 flag)
1053 {
1054         if (plen > maxlen) {
1055                 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
1056                 return -EINVAL;
1057         }
1058         if (*opt_flags & flag) {
1059                 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
1060                 return -EINVAL;
1061         }
1062         *data_len = plen;
1063         *data = p;
1064         *opt_flags |= flag;
1065         return 0;
1066 }
1067 /*
1068  *   Process a Version 1 sync. connection
1069  */
1070 static inline int ip_vs_proc_sync_conn(struct netns_ipvs *ipvs, __u8 *p, __u8 *msg_end)
1071 {
1072         struct ip_vs_sync_conn_options opt;
1073         union  ip_vs_sync_conn *s;
1074         struct ip_vs_protocol *pp;
1075         struct ip_vs_conn_param param;
1076         __u32 flags;
1077         unsigned int af, state, pe_data_len=0, pe_name_len=0;
1078         __u8 *pe_data=NULL, *pe_name=NULL;
1079         __u32 opt_flags=0;
1080         int retc=0;
1081
1082         s = (union ip_vs_sync_conn *) p;
1083
1084         if (s->v6.type & STYPE_F_INET6) {
1085 #ifdef CONFIG_IP_VS_IPV6
1086                 af = AF_INET6;
1087                 p += sizeof(struct ip_vs_sync_v6);
1088 #else
1089                 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1090                 retc = 10;
1091                 goto out;
1092 #endif
1093         } else if (!s->v4.type) {
1094                 af = AF_INET;
1095                 p += sizeof(struct ip_vs_sync_v4);
1096         } else {
1097                 return -10;
1098         }
1099         if (p > msg_end)
1100                 return -20;
1101
1102         /* Process optional params check Type & Len. */
1103         while (p < msg_end) {
1104                 int ptype;
1105                 int plen;
1106
1107                 if (p+2 > msg_end)
1108                         return -30;
1109                 ptype = *(p++);
1110                 plen  = *(p++);
1111
1112                 if (!plen || ((p + plen) > msg_end))
1113                         return -40;
1114                 /* Handle seq option  p = param data */
1115                 switch (ptype & ~IPVS_OPT_F_PARAM) {
1116                 case IPVS_OPT_SEQ_DATA:
1117                         if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
1118                                 return -50;
1119                         break;
1120
1121                 case IPVS_OPT_PE_DATA:
1122                         if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
1123                                            IP_VS_PEDATA_MAXLEN, &opt_flags,
1124                                            IPVS_OPT_F_PE_DATA))
1125                                 return -60;
1126                         break;
1127
1128                 case IPVS_OPT_PE_NAME:
1129                         if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
1130                                            IP_VS_PENAME_MAXLEN, &opt_flags,
1131                                            IPVS_OPT_F_PE_NAME))
1132                                 return -70;
1133                         break;
1134
1135                 default:
1136                         /* Param data mandatory ? */
1137                         if (!(ptype & IPVS_OPT_F_PARAM)) {
1138                                 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1139                                           ptype & ~IPVS_OPT_F_PARAM);
1140                                 retc = 20;
1141                                 goto out;
1142                         }
1143                 }
1144                 p += plen;  /* Next option */
1145         }
1146
1147         /* Get flags and Mask off unsupported */
1148         flags  = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
1149         flags |= IP_VS_CONN_F_SYNC;
1150         state = ntohs(s->v4.state);
1151
1152         if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
1153                 pp = ip_vs_proto_get(s->v4.protocol);
1154                 if (!pp) {
1155                         IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1156                                 s->v4.protocol);
1157                         retc = 30;
1158                         goto out;
1159                 }
1160                 if (state >= pp->num_states) {
1161                         IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1162                                 pp->name, state);
1163                         retc = 40;
1164                         goto out;
1165                 }
1166         } else {
1167                 /* protocol in templates is not used for state/timeout */
1168                 if (state > 0) {
1169                         IP_VS_DBG(3, "BACKUP, Invalid template state %u\n",
1170                                 state);
1171                         state = 0;
1172                 }
1173         }
1174         if (ip_vs_conn_fill_param_sync(ipvs, af, s, &param, pe_data,
1175                                        pe_data_len, pe_name, pe_name_len)) {
1176                 retc = 50;
1177                 goto out;
1178         }
1179         /* If only IPv4, just silent skip IPv6 */
1180         if (af == AF_INET)
1181                 ip_vs_proc_conn(ipvs, &param, flags, state, s->v4.protocol, af,
1182                                 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
1183                                 ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
1184                                 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1185                                 );
1186 #ifdef CONFIG_IP_VS_IPV6
1187         else
1188                 ip_vs_proc_conn(ipvs, &param, flags, state, s->v6.protocol, af,
1189                                 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
1190                                 ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
1191                                 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1192                                 );
1193 #endif
1194         ip_vs_pe_put(param.pe);
1195         return 0;
1196         /* Error exit */
1197 out:
1198         IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc);
1199         return retc;
1200
1201 }
1202 /*
1203  *      Process received multicast message and create the corresponding
1204  *      ip_vs_conn entries.
1205  *      Handles Version 0 & 1
1206  */
1207 static void ip_vs_process_message(struct netns_ipvs *ipvs, __u8 *buffer,
1208                                   const size_t buflen)
1209 {
1210         struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
1211         __u8 *p, *msg_end;
1212         int i, nr_conns;
1213
1214         if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
1215                 IP_VS_DBG(2, "BACKUP, message header too short\n");
1216                 return;
1217         }
1218
1219         if (buflen != ntohs(m2->size)) {
1220                 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1221                 return;
1222         }
1223         /* SyncID sanity check */
1224         if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
1225                 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
1226                 return;
1227         }
1228         /* Handle version 1  message */
1229         if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
1230             && (m2->spare == 0)) {
1231
1232                 msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
1233                 nr_conns = m2->nr_conns;
1234
1235                 for (i=0; i<nr_conns; i++) {
1236                         union ip_vs_sync_conn *s;
1237                         unsigned int size;
1238                         int retc;
1239
1240                         p = msg_end;
1241                         if (p + sizeof(s->v4) > buffer+buflen) {
1242                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n");
1243                                 return;
1244                         }
1245                         s = (union ip_vs_sync_conn *)p;
1246                         size = ntohs(s->v4.ver_size) & SVER_MASK;
1247                         msg_end = p + size;
1248                         /* Basic sanity checks */
1249                         if (msg_end  > buffer+buflen) {
1250                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1251                                 return;
1252                         }
1253                         if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
1254                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1255                                               ntohs(s->v4.ver_size) >> SVER_SHIFT);
1256                                 return;
1257                         }
1258                         /* Process a single sync_conn */
1259                         retc = ip_vs_proc_sync_conn(ipvs, p, msg_end);
1260                         if (retc < 0) {
1261                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1262                                              retc);
1263                                 return;
1264                         }
1265                         /* Make sure we have 32 bit alignment */
1266                         msg_end = p + ((size + 3) & ~3);
1267                 }
1268         } else {
1269                 /* Old type of message */
1270                 ip_vs_process_message_v0(ipvs, buffer, buflen);
1271                 return;
1272         }
1273 }
1274
1275
1276 /*
1277  *      Setup sndbuf (mode=1) or rcvbuf (mode=0)
1278  */
1279 static void set_sock_size(struct sock *sk, int mode, int val)
1280 {
1281         /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1282         /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1283         lock_sock(sk);
1284         if (mode) {
1285                 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
1286                               sysctl_wmem_max);
1287                 sk->sk_sndbuf = val * 2;
1288                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1289         } else {
1290                 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
1291                               sysctl_rmem_max);
1292                 sk->sk_rcvbuf = val * 2;
1293                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1294         }
1295         release_sock(sk);
1296 }
1297
1298 /*
1299  *      Setup loopback of outgoing multicasts on a sending socket
1300  */
1301 static void set_mcast_loop(struct sock *sk, u_char loop)
1302 {
1303         struct inet_sock *inet = inet_sk(sk);
1304
1305         /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1306         lock_sock(sk);
1307         inet->mc_loop = loop ? 1 : 0;
1308 #ifdef CONFIG_IP_VS_IPV6
1309         if (sk->sk_family == AF_INET6) {
1310                 struct ipv6_pinfo *np = inet6_sk(sk);
1311
1312                 /* IPV6_MULTICAST_LOOP */
1313                 np->mc_loop = loop ? 1 : 0;
1314         }
1315 #endif
1316         release_sock(sk);
1317 }
1318
1319 /*
1320  *      Specify TTL for outgoing multicasts on a sending socket
1321  */
1322 static void set_mcast_ttl(struct sock *sk, u_char ttl)
1323 {
1324         struct inet_sock *inet = inet_sk(sk);
1325
1326         /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1327         lock_sock(sk);
1328         inet->mc_ttl = ttl;
1329 #ifdef CONFIG_IP_VS_IPV6
1330         if (sk->sk_family == AF_INET6) {
1331                 struct ipv6_pinfo *np = inet6_sk(sk);
1332
1333                 /* IPV6_MULTICAST_HOPS */
1334                 np->mcast_hops = ttl;
1335         }
1336 #endif
1337         release_sock(sk);
1338 }
1339
1340 /* Control fragmentation of messages */
1341 static void set_mcast_pmtudisc(struct sock *sk, int val)
1342 {
1343         struct inet_sock *inet = inet_sk(sk);
1344
1345         /* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
1346         lock_sock(sk);
1347         inet->pmtudisc = val;
1348 #ifdef CONFIG_IP_VS_IPV6
1349         if (sk->sk_family == AF_INET6) {
1350                 struct ipv6_pinfo *np = inet6_sk(sk);
1351
1352                 /* IPV6_MTU_DISCOVER */
1353                 np->pmtudisc = val;
1354         }
1355 #endif
1356         release_sock(sk);
1357 }
1358
1359 /*
1360  *      Specifiy default interface for outgoing multicasts
1361  */
1362 static int set_mcast_if(struct sock *sk, char *ifname)
1363 {
1364         struct net_device *dev;
1365         struct inet_sock *inet = inet_sk(sk);
1366         struct net *net = sock_net(sk);
1367
1368         dev = __dev_get_by_name(net, ifname);
1369         if (!dev)
1370                 return -ENODEV;
1371
1372         if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1373                 return -EINVAL;
1374
1375         lock_sock(sk);
1376         inet->mc_index = dev->ifindex;
1377         /*  inet->mc_addr  = 0; */
1378 #ifdef CONFIG_IP_VS_IPV6
1379         if (sk->sk_family == AF_INET6) {
1380                 struct ipv6_pinfo *np = inet6_sk(sk);
1381
1382                 /* IPV6_MULTICAST_IF */
1383                 np->mcast_oif = dev->ifindex;
1384         }
1385 #endif
1386         release_sock(sk);
1387
1388         return 0;
1389 }
1390
1391
1392 /*
1393  *      Join a multicast group.
1394  *      the group is specified by a class D multicast address 224.0.0.0/8
1395  *      in the in_addr structure passed in as a parameter.
1396  */
1397 static int
1398 join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
1399 {
1400         struct net *net = sock_net(sk);
1401         struct ip_mreqn mreq;
1402         struct net_device *dev;
1403         int ret;
1404
1405         memset(&mreq, 0, sizeof(mreq));
1406         memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
1407
1408         dev = __dev_get_by_name(net, ifname);
1409         if (!dev)
1410                 return -ENODEV;
1411         if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1412                 return -EINVAL;
1413
1414         mreq.imr_ifindex = dev->ifindex;
1415
1416         lock_sock(sk);
1417         ret = ip_mc_join_group(sk, &mreq);
1418         release_sock(sk);
1419
1420         return ret;
1421 }
1422
1423 #ifdef CONFIG_IP_VS_IPV6
1424 static int join_mcast_group6(struct sock *sk, struct in6_addr *addr,
1425                              char *ifname)
1426 {
1427         struct net *net = sock_net(sk);
1428         struct net_device *dev;
1429         int ret;
1430
1431         dev = __dev_get_by_name(net, ifname);
1432         if (!dev)
1433                 return -ENODEV;
1434         if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1435                 return -EINVAL;
1436
1437         lock_sock(sk);
1438         ret = ipv6_sock_mc_join(sk, dev->ifindex, addr);
1439         release_sock(sk);
1440
1441         return ret;
1442 }
1443 #endif
1444
1445 static int bind_mcastif_addr(struct socket *sock, char *ifname)
1446 {
1447         struct net *net = sock_net(sock->sk);
1448         struct net_device *dev;
1449         __be32 addr;
1450         struct sockaddr_in sin;
1451
1452         dev = __dev_get_by_name(net, ifname);
1453         if (!dev)
1454                 return -ENODEV;
1455
1456         addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
1457         if (!addr)
1458                 pr_err("You probably need to specify IP address on "
1459                        "multicast interface.\n");
1460
1461         IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1462                   ifname, &addr);
1463
1464         /* Now bind the socket with the address of multicast interface */
1465         sin.sin_family       = AF_INET;
1466         sin.sin_addr.s_addr  = addr;
1467         sin.sin_port         = 0;
1468
1469         return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
1470 }
1471
1472 static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
1473                                struct ipvs_sync_daemon_cfg *c, int id)
1474 {
1475         if (AF_INET6 == c->mcast_af) {
1476                 sa->in6 = (struct sockaddr_in6) {
1477                         .sin6_family = AF_INET6,
1478                         .sin6_port = htons(c->mcast_port + id),
1479                 };
1480                 sa->in6.sin6_addr = c->mcast_group.in6;
1481                 *salen = sizeof(sa->in6);
1482         } else {
1483                 sa->in = (struct sockaddr_in) {
1484                         .sin_family = AF_INET,
1485                         .sin_port = htons(c->mcast_port + id),
1486                 };
1487                 sa->in.sin_addr = c->mcast_group.in;
1488                 *salen = sizeof(sa->in);
1489         }
1490 }
1491
1492 /*
1493  *      Set up sending multicast socket over UDP
1494  */
1495 static struct socket *make_send_sock(struct netns_ipvs *ipvs, int id)
1496 {
1497         /* multicast addr */
1498         union ipvs_sockaddr mcast_addr;
1499         struct socket *sock;
1500         int result, salen;
1501
1502         /* First create a socket */
1503         result = sock_create_kern(ipvs->net, ipvs->mcfg.mcast_af, SOCK_DGRAM,
1504                                   IPPROTO_UDP, &sock);
1505         if (result < 0) {
1506                 pr_err("Error during creation of socket; terminating\n");
1507                 return ERR_PTR(result);
1508         }
1509         result = set_mcast_if(sock->sk, ipvs->mcfg.mcast_ifn);
1510         if (result < 0) {
1511                 pr_err("Error setting outbound mcast interface\n");
1512                 goto error;
1513         }
1514
1515         set_mcast_loop(sock->sk, 0);
1516         set_mcast_ttl(sock->sk, ipvs->mcfg.mcast_ttl);
1517         /* Allow fragmentation if MTU changes */
1518         set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
1519         result = sysctl_sync_sock_size(ipvs);
1520         if (result > 0)
1521                 set_sock_size(sock->sk, 1, result);
1522
1523         if (AF_INET == ipvs->mcfg.mcast_af)
1524                 result = bind_mcastif_addr(sock, ipvs->mcfg.mcast_ifn);
1525         else
1526                 result = 0;
1527         if (result < 0) {
1528                 pr_err("Error binding address of the mcast interface\n");
1529                 goto error;
1530         }
1531
1532         get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->mcfg, id);
1533         result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
1534                                     salen, 0);
1535         if (result < 0) {
1536                 pr_err("Error connecting to the multicast addr\n");
1537                 goto error;
1538         }
1539
1540         return sock;
1541
1542 error:
1543         sock_release(sock);
1544         return ERR_PTR(result);
1545 }
1546
1547
1548 /*
1549  *      Set up receiving multicast socket over UDP
1550  */
1551 static struct socket *make_receive_sock(struct netns_ipvs *ipvs, int id,
1552                                         int ifindex)
1553 {
1554         /* multicast addr */
1555         union ipvs_sockaddr mcast_addr;
1556         struct socket *sock;
1557         int result, salen;
1558
1559         /* First create a socket */
1560         result = sock_create_kern(ipvs->net, ipvs->bcfg.mcast_af, SOCK_DGRAM,
1561                                   IPPROTO_UDP, &sock);
1562         if (result < 0) {
1563                 pr_err("Error during creation of socket; terminating\n");
1564                 return ERR_PTR(result);
1565         }
1566         /* it is equivalent to the REUSEADDR option in user-space */
1567         sock->sk->sk_reuse = SK_CAN_REUSE;
1568         result = sysctl_sync_sock_size(ipvs);
1569         if (result > 0)
1570                 set_sock_size(sock->sk, 0, result);
1571
1572         get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
1573         sock->sk->sk_bound_dev_if = ifindex;
1574         result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
1575         if (result < 0) {
1576                 pr_err("Error binding to the multicast addr\n");
1577                 goto error;
1578         }
1579
1580         /* join the multicast group */
1581 #ifdef CONFIG_IP_VS_IPV6
1582         if (ipvs->bcfg.mcast_af == AF_INET6)
1583                 result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr,
1584                                            ipvs->bcfg.mcast_ifn);
1585         else
1586 #endif
1587                 result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr,
1588                                           ipvs->bcfg.mcast_ifn);
1589         if (result < 0) {
1590                 pr_err("Error joining to the multicast group\n");
1591                 goto error;
1592         }
1593
1594         return sock;
1595
1596 error:
1597         sock_release(sock);
1598         return ERR_PTR(result);
1599 }
1600
1601
1602 static int
1603 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
1604 {
1605         struct msghdr   msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
1606         struct kvec     iov;
1607         int             len;
1608
1609         EnterFunction(7);
1610         iov.iov_base     = (void *)buffer;
1611         iov.iov_len      = length;
1612
1613         len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
1614
1615         LeaveFunction(7);
1616         return len;
1617 }
1618
1619 static int
1620 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
1621 {
1622         int msize;
1623         int ret;
1624
1625         msize = ntohs(msg->size);
1626
1627         ret = ip_vs_send_async(sock, (char *)msg, msize);
1628         if (ret >= 0 || ret == -EAGAIN)
1629                 return ret;
1630         pr_err("ip_vs_send_async error %d\n", ret);
1631         return 0;
1632 }
1633
1634 static int
1635 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
1636 {
1637         struct msghdr           msg = {NULL,};
1638         struct kvec             iov;
1639         int                     len;
1640
1641         EnterFunction(7);
1642
1643         /* Receive a packet */
1644         iov.iov_base     = buffer;
1645         iov.iov_len      = (size_t)buflen;
1646
1647         len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, MSG_DONTWAIT);
1648
1649         if (len < 0)
1650                 return len;
1651
1652         LeaveFunction(7);
1653         return len;
1654 }
1655
1656 /* Wakeup the master thread for sending */
1657 static void master_wakeup_work_handler(struct work_struct *work)
1658 {
1659         struct ipvs_master_sync_state *ms =
1660                 container_of(work, struct ipvs_master_sync_state,
1661                              master_wakeup_work.work);
1662         struct netns_ipvs *ipvs = ms->ipvs;
1663
1664         spin_lock_bh(&ipvs->sync_lock);
1665         if (ms->sync_queue_len &&
1666             ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
1667                 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
1668                 wake_up_process(ms->master_thread);
1669         }
1670         spin_unlock_bh(&ipvs->sync_lock);
1671 }
1672
1673 /* Get next buffer to send */
1674 static inline struct ip_vs_sync_buff *
1675 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
1676 {
1677         struct ip_vs_sync_buff *sb;
1678
1679         sb = sb_dequeue(ipvs, ms);
1680         if (sb)
1681                 return sb;
1682         /* Do not delay entries in buffer for more than 2 seconds */
1683         return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
1684 }
1685
1686 static int sync_thread_master(void *data)
1687 {
1688         struct ip_vs_sync_thread_data *tinfo = data;
1689         struct netns_ipvs *ipvs = tinfo->ipvs;
1690         struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
1691         struct sock *sk = tinfo->sock->sk;
1692         struct ip_vs_sync_buff *sb;
1693
1694         pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1695                 "syncid = %d, id = %d\n",
1696                 ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
1697
1698         for (;;) {
1699                 sb = next_sync_buff(ipvs, ms);
1700                 if (unlikely(kthread_should_stop()))
1701                         break;
1702                 if (!sb) {
1703                         schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
1704                         continue;
1705                 }
1706                 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
1707                         /* (Ab)use interruptible sleep to avoid increasing
1708                          * the load avg.
1709                          */
1710                         __wait_event_interruptible(*sk_sleep(sk),
1711                                                    sock_writeable(sk) ||
1712                                                    kthread_should_stop());
1713                         if (unlikely(kthread_should_stop()))
1714                                 goto done;
1715                 }
1716                 ip_vs_sync_buff_release(sb);
1717         }
1718
1719 done:
1720         __set_current_state(TASK_RUNNING);
1721         if (sb)
1722                 ip_vs_sync_buff_release(sb);
1723
1724         /* clean up the sync_buff queue */
1725         while ((sb = sb_dequeue(ipvs, ms)))
1726                 ip_vs_sync_buff_release(sb);
1727         __set_current_state(TASK_RUNNING);
1728
1729         /* clean up the current sync_buff */
1730         sb = get_curr_sync_buff(ipvs, ms, 0);
1731         if (sb)
1732                 ip_vs_sync_buff_release(sb);
1733
1734         /* release the sending multicast socket */
1735         sock_release(tinfo->sock);
1736         kfree(tinfo);
1737
1738         return 0;
1739 }
1740
1741
1742 static int sync_thread_backup(void *data)
1743 {
1744         struct ip_vs_sync_thread_data *tinfo = data;
1745         struct netns_ipvs *ipvs = tinfo->ipvs;
1746         int len;
1747
1748         pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1749                 "syncid = %d, id = %d\n",
1750                 ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
1751
1752         while (!kthread_should_stop()) {
1753                 wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
1754                          !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
1755                          || kthread_should_stop());
1756
1757                 /* do we have data now? */
1758                 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
1759                         len = ip_vs_receive(tinfo->sock, tinfo->buf,
1760                                         ipvs->bcfg.sync_maxlen);
1761                         if (len <= 0) {
1762                                 if (len != -EAGAIN)
1763                                         pr_err("receiving message error\n");
1764                                 break;
1765                         }
1766
1767                         ip_vs_process_message(ipvs, tinfo->buf, len);
1768                 }
1769         }
1770
1771         /* release the sending multicast socket */
1772         sock_release(tinfo->sock);
1773         kfree(tinfo->buf);
1774         kfree(tinfo);
1775
1776         return 0;
1777 }
1778
1779
1780 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
1781                       int state)
1782 {
1783         struct ip_vs_sync_thread_data *tinfo;
1784         struct task_struct **array = NULL, *task;
1785         struct socket *sock;
1786         struct net_device *dev;
1787         char *name;
1788         int (*threadfn)(void *data);
1789         int id, count, hlen;
1790         int result = -ENOMEM;
1791         u16 mtu, min_mtu;
1792
1793         IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1794         IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %zd bytes\n",
1795                   sizeof(struct ip_vs_sync_conn_v0));
1796
1797         if (!ipvs->sync_state) {
1798                 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
1799                 ipvs->threads_mask = count - 1;
1800         } else
1801                 count = ipvs->threads_mask + 1;
1802
1803         if (c->mcast_af == AF_UNSPEC) {
1804                 c->mcast_af = AF_INET;
1805                 c->mcast_group.ip = cpu_to_be32(IP_VS_SYNC_GROUP);
1806         }
1807         if (!c->mcast_port)
1808                 c->mcast_port = IP_VS_SYNC_PORT;
1809         if (!c->mcast_ttl)
1810                 c->mcast_ttl = 1;
1811
1812         dev = __dev_get_by_name(ipvs->net, c->mcast_ifn);
1813         if (!dev) {
1814                 pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
1815                 return -ENODEV;
1816         }
1817         hlen = (AF_INET6 == c->mcast_af) ?
1818                sizeof(struct ipv6hdr) + sizeof(struct udphdr) :
1819                sizeof(struct iphdr) + sizeof(struct udphdr);
1820         mtu = (state == IP_VS_STATE_BACKUP) ?
1821                   clamp(dev->mtu, 1500U, 65535U) : 1500U;
1822         min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
1823
1824         if (c->sync_maxlen)
1825                 c->sync_maxlen = clamp_t(unsigned int,
1826                                          c->sync_maxlen, min_mtu,
1827                                          65535 - hlen);
1828         else
1829                 c->sync_maxlen = mtu - hlen;
1830
1831         if (state == IP_VS_STATE_MASTER) {
1832                 if (ipvs->ms)
1833                         return -EEXIST;
1834
1835                 ipvs->mcfg = *c;
1836                 name = "ipvs-m:%d:%d";
1837                 threadfn = sync_thread_master;
1838         } else if (state == IP_VS_STATE_BACKUP) {
1839                 if (ipvs->backup_threads)
1840                         return -EEXIST;
1841
1842                 ipvs->bcfg = *c;
1843                 name = "ipvs-b:%d:%d";
1844                 threadfn = sync_thread_backup;
1845         } else {
1846                 return -EINVAL;
1847         }
1848
1849         if (state == IP_VS_STATE_MASTER) {
1850                 struct ipvs_master_sync_state *ms;
1851
1852                 ipvs->ms = kcalloc(count, sizeof(ipvs->ms[0]), GFP_KERNEL);
1853                 if (!ipvs->ms)
1854                         goto out;
1855                 ms = ipvs->ms;
1856                 for (id = 0; id < count; id++, ms++) {
1857                         INIT_LIST_HEAD(&ms->sync_queue);
1858                         ms->sync_queue_len = 0;
1859                         ms->sync_queue_delay = 0;
1860                         INIT_DELAYED_WORK(&ms->master_wakeup_work,
1861                                           master_wakeup_work_handler);
1862                         ms->ipvs = ipvs;
1863                 }
1864         } else {
1865                 array = kcalloc(count, sizeof(struct task_struct *),
1866                                 GFP_KERNEL);
1867                 if (!array)
1868                         goto out;
1869         }
1870
1871         tinfo = NULL;
1872         for (id = 0; id < count; id++) {
1873                 if (state == IP_VS_STATE_MASTER)
1874                         sock = make_send_sock(ipvs, id);
1875                 else
1876                         sock = make_receive_sock(ipvs, id, dev->ifindex);
1877                 if (IS_ERR(sock)) {
1878                         result = PTR_ERR(sock);
1879                         goto outtinfo;
1880                 }
1881                 tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
1882                 if (!tinfo)
1883                         goto outsocket;
1884                 tinfo->ipvs = ipvs;
1885                 tinfo->sock = sock;
1886                 if (state == IP_VS_STATE_BACKUP) {
1887                         tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
1888                                              GFP_KERNEL);
1889                         if (!tinfo->buf)
1890                                 goto outtinfo;
1891                 } else {
1892                         tinfo->buf = NULL;
1893                 }
1894                 tinfo->id = id;
1895
1896                 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
1897                 if (IS_ERR(task)) {
1898                         result = PTR_ERR(task);
1899                         goto outtinfo;
1900                 }
1901                 tinfo = NULL;
1902                 if (state == IP_VS_STATE_MASTER)
1903                         ipvs->ms[id].master_thread = task;
1904                 else
1905                         array[id] = task;
1906         }
1907
1908         /* mark as active */
1909
1910         if (state == IP_VS_STATE_BACKUP)
1911                 ipvs->backup_threads = array;
1912         spin_lock_bh(&ipvs->sync_buff_lock);
1913         ipvs->sync_state |= state;
1914         spin_unlock_bh(&ipvs->sync_buff_lock);
1915
1916         /* increase the module use count */
1917         ip_vs_use_count_inc();
1918
1919         return 0;
1920
1921 outsocket:
1922         sock_release(sock);
1923
1924 outtinfo:
1925         if (tinfo) {
1926                 sock_release(tinfo->sock);
1927                 kfree(tinfo->buf);
1928                 kfree(tinfo);
1929         }
1930         count = id;
1931         while (count-- > 0) {
1932                 if (state == IP_VS_STATE_MASTER)
1933                         kthread_stop(ipvs->ms[count].master_thread);
1934                 else
1935                         kthread_stop(array[count]);
1936         }
1937         kfree(array);
1938
1939 out:
1940         if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
1941                 kfree(ipvs->ms);
1942                 ipvs->ms = NULL;
1943         }
1944         return result;
1945 }
1946
1947
1948 int stop_sync_thread(struct netns_ipvs *ipvs, int state)
1949 {
1950         struct task_struct **array;
1951         int id;
1952         int retc = -EINVAL;
1953
1954         IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1955
1956         if (state == IP_VS_STATE_MASTER) {
1957                 if (!ipvs->ms)
1958                         return -ESRCH;
1959
1960                 /*
1961                  * The lock synchronizes with sb_queue_tail(), so that we don't
1962                  * add sync buffers to the queue, when we are already in
1963                  * progress of stopping the master sync daemon.
1964                  */
1965
1966                 spin_lock_bh(&ipvs->sync_buff_lock);
1967                 spin_lock(&ipvs->sync_lock);
1968                 ipvs->sync_state &= ~IP_VS_STATE_MASTER;
1969                 spin_unlock(&ipvs->sync_lock);
1970                 spin_unlock_bh(&ipvs->sync_buff_lock);
1971
1972                 retc = 0;
1973                 for (id = ipvs->threads_mask; id >= 0; id--) {
1974                         struct ipvs_master_sync_state *ms = &ipvs->ms[id];
1975                         int ret;
1976
1977                         pr_info("stopping master sync thread %d ...\n",
1978                                 task_pid_nr(ms->master_thread));
1979                         cancel_delayed_work_sync(&ms->master_wakeup_work);
1980                         ret = kthread_stop(ms->master_thread);
1981                         if (retc >= 0)
1982                                 retc = ret;
1983                 }
1984                 kfree(ipvs->ms);
1985                 ipvs->ms = NULL;
1986         } else if (state == IP_VS_STATE_BACKUP) {
1987                 if (!ipvs->backup_threads)
1988                         return -ESRCH;
1989
1990                 ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
1991                 array = ipvs->backup_threads;
1992                 retc = 0;
1993                 for (id = ipvs->threads_mask; id >= 0; id--) {
1994                         int ret;
1995
1996                         pr_info("stopping backup sync thread %d ...\n",
1997                                 task_pid_nr(array[id]));
1998                         ret = kthread_stop(array[id]);
1999                         if (retc >= 0)
2000                                 retc = ret;
2001                 }
2002                 kfree(array);
2003                 ipvs->backup_threads = NULL;
2004         }
2005
2006         /* decrease the module use count */
2007         ip_vs_use_count_dec();
2008
2009         return retc;
2010 }
2011
2012 /*
2013  * Initialize data struct for each netns
2014  */
2015 int __net_init ip_vs_sync_net_init(struct netns_ipvs *ipvs)
2016 {
2017         __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
2018         spin_lock_init(&ipvs->sync_lock);
2019         spin_lock_init(&ipvs->sync_buff_lock);
2020         return 0;
2021 }
2022
2023 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs)
2024 {
2025         int retc;
2026
2027         mutex_lock(&ipvs->sync_mutex);
2028         retc = stop_sync_thread(ipvs, IP_VS_STATE_MASTER);
2029         if (retc && retc != -ESRCH)
2030                 pr_err("Failed to stop Master Daemon\n");
2031
2032         retc = stop_sync_thread(ipvs, IP_VS_STATE_BACKUP);
2033         if (retc && retc != -ESRCH)
2034                 pr_err("Failed to stop Backup Daemon\n");
2035         mutex_unlock(&ipvs->sync_mutex);
2036 }