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TOMOYO Linux Cross Reference
Linux/net/netfilter/ipvs/ip_vs_sync.c

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
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  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         ho->init_seq       = get_unaligned_be32(&no->init_seq);
287         ho->delta          = get_unaligned_be32(&no->delta);
288         ho->previous_delta = get_unaligned_be32(&no->previous_delta);
289 }
290 
291 /*
292  * Copy of struct ip_vs_seq
293  * From Aligned host order to unaligned network order
294  */
295 static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no)
296 {
297         put_unaligned_be32(ho->init_seq, &no->init_seq);
298         put_unaligned_be32(ho->delta, &no->delta);
299         put_unaligned_be32(ho->previous_delta, &no->previous_delta);
300 }
301 
302 static inline struct ip_vs_sync_buff *
303 sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
304 {
305         struct ip_vs_sync_buff *sb;
306 
307         spin_lock_bh(&ipvs->sync_lock);
308         if (list_empty(&ms->sync_queue)) {
309                 sb = NULL;
310                 __set_current_state(TASK_INTERRUPTIBLE);
311         } else {
312                 sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff,
313                                 list);
314                 list_del(&sb->list);
315                 ms->sync_queue_len--;
316                 if (!ms->sync_queue_len)
317                         ms->sync_queue_delay = 0;
318         }
319         spin_unlock_bh(&ipvs->sync_lock);
320 
321         return sb;
322 }
323 
324 /*
325  * Create a new sync buffer for Version 1 proto.
326  */
327 static inline struct ip_vs_sync_buff *
328 ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
329 {
330         struct ip_vs_sync_buff *sb;
331 
332         if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
333                 return NULL;
334 
335         len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
336                     ipvs->mcfg.sync_maxlen);
337         sb->mesg = kmalloc(len, GFP_ATOMIC);
338         if (!sb->mesg) {
339                 kfree(sb);
340                 return NULL;
341         }
342         sb->mesg->reserved = 0;  /* old nr_conns i.e. must be zero now */
343         sb->mesg->version = SYNC_PROTO_VER;
344         sb->mesg->syncid = ipvs->mcfg.syncid;
345         sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
346         sb->mesg->nr_conns = 0;
347         sb->mesg->spare = 0;
348         sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
349         sb->end = (unsigned char *)sb->mesg + len;
350 
351         sb->firstuse = jiffies;
352         return sb;
353 }
354 
355 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
356 {
357         kfree(sb->mesg);
358         kfree(sb);
359 }
360 
361 static inline void sb_queue_tail(struct netns_ipvs *ipvs,
362                                  struct ipvs_master_sync_state *ms)
363 {
364         struct ip_vs_sync_buff *sb = ms->sync_buff;
365 
366         spin_lock(&ipvs->sync_lock);
367         if (ipvs->sync_state & IP_VS_STATE_MASTER &&
368             ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) {
369                 if (!ms->sync_queue_len)
370                         schedule_delayed_work(&ms->master_wakeup_work,
371                                               max(IPVS_SYNC_SEND_DELAY, 1));
372                 ms->sync_queue_len++;
373                 list_add_tail(&sb->list, &ms->sync_queue);
374                 if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE)
375                         wake_up_process(ms->master_thread);
376         } else
377                 ip_vs_sync_buff_release(sb);
378         spin_unlock(&ipvs->sync_lock);
379 }
380 
381 /*
382  *      Get the current sync buffer if it has been created for more
383  *      than the specified time or the specified time is zero.
384  */
385 static inline struct ip_vs_sync_buff *
386 get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms,
387                    unsigned long time)
388 {
389         struct ip_vs_sync_buff *sb;
390 
391         spin_lock_bh(&ipvs->sync_buff_lock);
392         sb = ms->sync_buff;
393         if (sb && time_after_eq(jiffies - sb->firstuse, time)) {
394                 ms->sync_buff = NULL;
395                 __set_current_state(TASK_RUNNING);
396         } else
397                 sb = NULL;
398         spin_unlock_bh(&ipvs->sync_buff_lock);
399         return sb;
400 }
401 
402 static inline int
403 select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
404 {
405         return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask;
406 }
407 
408 /*
409  * Create a new sync buffer for Version 0 proto.
410  */
411 static inline struct ip_vs_sync_buff *
412 ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
413 {
414         struct ip_vs_sync_buff *sb;
415         struct ip_vs_sync_mesg_v0 *mesg;
416 
417         if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
418                 return NULL;
419 
420         len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
421                     ipvs->mcfg.sync_maxlen);
422         sb->mesg = kmalloc(len, GFP_ATOMIC);
423         if (!sb->mesg) {
424                 kfree(sb);
425                 return NULL;
426         }
427         mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
428         mesg->nr_conns = 0;
429         mesg->syncid = ipvs->mcfg.syncid;
430         mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
431         sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
432         sb->end = (unsigned char *)mesg + len;
433         sb->firstuse = jiffies;
434         return sb;
435 }
436 
437 /* Check if connection is controlled by persistence */
438 static inline bool in_persistence(struct ip_vs_conn *cp)
439 {
440         for (cp = cp->control; cp; cp = cp->control) {
441                 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
442                         return true;
443         }
444         return false;
445 }
446 
447 /* Check if conn should be synced.
448  * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
449  * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
450  *      sync_retries times with period of sync_refresh_period/8
451  * - (2) if both sync_refresh_period and sync_period are 0 send sync only
452  *      for state changes or only once when pkts matches sync_threshold
453  * - (3) templates: rate can be reduced only with sync_refresh_period or
454  *      with (2)
455  */
456 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
457                                   struct ip_vs_conn *cp, int pkts)
458 {
459         unsigned long orig = ACCESS_ONCE(cp->sync_endtime);
460         unsigned long now = jiffies;
461         unsigned long n = (now + cp->timeout) & ~3UL;
462         unsigned int sync_refresh_period;
463         int sync_period;
464         int force;
465 
466         /* Check if we sync in current state */
467         if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
468                 force = 0;
469         else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
470                 return 0;
471         else if (likely(cp->protocol == IPPROTO_TCP)) {
472                 if (!((1 << cp->state) &
473                       ((1 << IP_VS_TCP_S_ESTABLISHED) |
474                        (1 << IP_VS_TCP_S_FIN_WAIT) |
475                        (1 << IP_VS_TCP_S_CLOSE) |
476                        (1 << IP_VS_TCP_S_CLOSE_WAIT) |
477                        (1 << IP_VS_TCP_S_TIME_WAIT))))
478                         return 0;
479                 force = cp->state != cp->old_state;
480                 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
481                         goto set;
482         } else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
483                 if (!((1 << cp->state) &
484                       ((1 << IP_VS_SCTP_S_ESTABLISHED) |
485                        (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) |
486                        (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) |
487                        (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) |
488                        (1 << IP_VS_SCTP_S_CLOSED))))
489                         return 0;
490                 force = cp->state != cp->old_state;
491                 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
492                         goto set;
493         } else {
494                 /* UDP or another protocol with single state */
495                 force = 0;
496         }
497 
498         sync_refresh_period = sysctl_sync_refresh_period(ipvs);
499         if (sync_refresh_period > 0) {
500                 long diff = n - orig;
501                 long min_diff = max(cp->timeout >> 1, 10UL * HZ);
502 
503                 /* Avoid sync if difference is below sync_refresh_period
504                  * and below the half timeout.
505                  */
506                 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
507                         int retries = orig & 3;
508 
509                         if (retries >= sysctl_sync_retries(ipvs))
510                                 return 0;
511                         if (time_before(now, orig - cp->timeout +
512                                         (sync_refresh_period >> 3)))
513                                 return 0;
514                         n |= retries + 1;
515                 }
516         }
517         sync_period = sysctl_sync_period(ipvs);
518         if (sync_period > 0) {
519                 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
520                     pkts % sync_period != sysctl_sync_threshold(ipvs))
521                         return 0;
522         } else if (sync_refresh_period <= 0 &&
523                    pkts != sysctl_sync_threshold(ipvs))
524                 return 0;
525 
526 set:
527         cp->old_state = cp->state;
528         n = cmpxchg(&cp->sync_endtime, orig, n);
529         return n == orig || force;
530 }
531 
532 /*
533  *      Version 0 , could be switched in by sys_ctl.
534  *      Add an ip_vs_conn information into the current sync_buff.
535  */
536 static void ip_vs_sync_conn_v0(struct netns_ipvs *ipvs, struct ip_vs_conn *cp,
537                                int pkts)
538 {
539         struct ip_vs_sync_mesg_v0 *m;
540         struct ip_vs_sync_conn_v0 *s;
541         struct ip_vs_sync_buff *buff;
542         struct ipvs_master_sync_state *ms;
543         int id;
544         unsigned int len;
545 
546         if (unlikely(cp->af != AF_INET))
547                 return;
548         /* Do not sync ONE PACKET */
549         if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
550                 return;
551 
552         if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
553                 return;
554 
555         spin_lock_bh(&ipvs->sync_buff_lock);
556         if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
557                 spin_unlock_bh(&ipvs->sync_buff_lock);
558                 return;
559         }
560 
561         id = select_master_thread_id(ipvs, cp);
562         ms = &ipvs->ms[id];
563         buff = ms->sync_buff;
564         len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
565                 SIMPLE_CONN_SIZE;
566         if (buff) {
567                 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
568                 /* Send buffer if it is for v1 */
569                 if (buff->head + len > buff->end || !m->nr_conns) {
570                         sb_queue_tail(ipvs, ms);
571                         ms->sync_buff = NULL;
572                         buff = NULL;
573                 }
574         }
575         if (!buff) {
576                 buff = ip_vs_sync_buff_create_v0(ipvs, len);
577                 if (!buff) {
578                         spin_unlock_bh(&ipvs->sync_buff_lock);
579                         pr_err("ip_vs_sync_buff_create failed.\n");
580                         return;
581                 }
582                 ms->sync_buff = buff;
583         }
584 
585         m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
586         s = (struct ip_vs_sync_conn_v0 *) buff->head;
587 
588         /* copy members */
589         s->reserved = 0;
590         s->protocol = cp->protocol;
591         s->cport = cp->cport;
592         s->vport = cp->vport;
593         s->dport = cp->dport;
594         s->caddr = cp->caddr.ip;
595         s->vaddr = cp->vaddr.ip;
596         s->daddr = cp->daddr.ip;
597         s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
598         s->state = htons(cp->state);
599         if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
600                 struct ip_vs_sync_conn_options *opt =
601                         (struct ip_vs_sync_conn_options *)&s[1];
602                 memcpy(opt, &cp->in_seq, sizeof(*opt));
603         }
604 
605         m->nr_conns++;
606         m->size = htons(ntohs(m->size) + len);
607         buff->head += len;
608         spin_unlock_bh(&ipvs->sync_buff_lock);
609 
610         /* synchronize its controller if it has */
611         cp = cp->control;
612         if (cp) {
613                 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
614                         pkts = atomic_add_return(1, &cp->in_pkts);
615                 else
616                         pkts = sysctl_sync_threshold(ipvs);
617                 ip_vs_sync_conn(ipvs, cp, pkts);
618         }
619 }
620 
621 /*
622  *      Add an ip_vs_conn information into the current sync_buff.
623  *      Called by ip_vs_in.
624  *      Sending Version 1 messages
625  */
626 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts)
627 {
628         struct ip_vs_sync_mesg *m;
629         union ip_vs_sync_conn *s;
630         struct ip_vs_sync_buff *buff;
631         struct ipvs_master_sync_state *ms;
632         int id;
633         __u8 *p;
634         unsigned int len, pe_name_len, pad;
635 
636         /* Handle old version of the protocol */
637         if (sysctl_sync_ver(ipvs) == 0) {
638                 ip_vs_sync_conn_v0(ipvs, cp, pkts);
639                 return;
640         }
641         /* Do not sync ONE PACKET */
642         if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
643                 goto control;
644 sloop:
645         if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
646                 goto control;
647 
648         /* Sanity checks */
649         pe_name_len = 0;
650         if (cp->pe_data_len) {
651                 if (!cp->pe_data || !cp->dest) {
652                         IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
653                         return;
654                 }
655                 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
656         }
657 
658         spin_lock_bh(&ipvs->sync_buff_lock);
659         if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
660                 spin_unlock_bh(&ipvs->sync_buff_lock);
661                 return;
662         }
663 
664         id = select_master_thread_id(ipvs, cp);
665         ms = &ipvs->ms[id];
666 
667 #ifdef CONFIG_IP_VS_IPV6
668         if (cp->af == AF_INET6)
669                 len = sizeof(struct ip_vs_sync_v6);
670         else
671 #endif
672                 len = sizeof(struct ip_vs_sync_v4);
673 
674         if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
675                 len += sizeof(struct ip_vs_sync_conn_options) + 2;
676 
677         if (cp->pe_data_len)
678                 len += cp->pe_data_len + 2;     /* + Param hdr field */
679         if (pe_name_len)
680                 len += pe_name_len + 2;
681 
682         /* check if there is a space for this one  */
683         pad = 0;
684         buff = ms->sync_buff;
685         if (buff) {
686                 m = buff->mesg;
687                 pad = (4 - (size_t) buff->head) & 3;
688                 /* Send buffer if it is for v0 */
689                 if (buff->head + len + pad > buff->end || m->reserved) {
690                         sb_queue_tail(ipvs, ms);
691                         ms->sync_buff = NULL;
692                         buff = NULL;
693                         pad = 0;
694                 }
695         }
696 
697         if (!buff) {
698                 buff = ip_vs_sync_buff_create(ipvs, len);
699                 if (!buff) {
700                         spin_unlock_bh(&ipvs->sync_buff_lock);
701                         pr_err("ip_vs_sync_buff_create failed.\n");
702                         return;
703                 }
704                 ms->sync_buff = buff;
705                 m = buff->mesg;
706         }
707 
708         p = buff->head;
709         buff->head += pad + len;
710         m->size = htons(ntohs(m->size) + pad + len);
711         /* Add ev. padding from prev. sync_conn */
712         while (pad--)
713                 *(p++) = 0;
714 
715         s = (union ip_vs_sync_conn *)p;
716 
717         /* Set message type  & copy members */
718         s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
719         s->v4.ver_size = htons(len & SVER_MASK);        /* Version 0 */
720         s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
721         s->v4.state = htons(cp->state);
722         s->v4.protocol = cp->protocol;
723         s->v4.cport = cp->cport;
724         s->v4.vport = cp->vport;
725         s->v4.dport = cp->dport;
726         s->v4.fwmark = htonl(cp->fwmark);
727         s->v4.timeout = htonl(cp->timeout / HZ);
728         m->nr_conns++;
729 
730 #ifdef CONFIG_IP_VS_IPV6
731         if (cp->af == AF_INET6) {
732                 p += sizeof(struct ip_vs_sync_v6);
733                 s->v6.caddr = cp->caddr.in6;
734                 s->v6.vaddr = cp->vaddr.in6;
735                 s->v6.daddr = cp->daddr.in6;
736         } else
737 #endif
738         {
739                 p += sizeof(struct ip_vs_sync_v4);      /* options ptr */
740                 s->v4.caddr = cp->caddr.ip;
741                 s->v4.vaddr = cp->vaddr.ip;
742                 s->v4.daddr = cp->daddr.ip;
743         }
744         if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
745                 *(p++) = IPVS_OPT_SEQ_DATA;
746                 *(p++) = sizeof(struct ip_vs_sync_conn_options);
747                 hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
748                 p += sizeof(struct ip_vs_seq);
749                 hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
750                 p += sizeof(struct ip_vs_seq);
751         }
752         /* Handle pe data */
753         if (cp->pe_data_len && cp->pe_data) {
754                 *(p++) = IPVS_OPT_PE_DATA;
755                 *(p++) = cp->pe_data_len;
756                 memcpy(p, cp->pe_data, cp->pe_data_len);
757                 p += cp->pe_data_len;
758                 if (pe_name_len) {
759                         /* Add PE_NAME */
760                         *(p++) = IPVS_OPT_PE_NAME;
761                         *(p++) = pe_name_len;
762                         memcpy(p, cp->pe->name, pe_name_len);
763                         p += pe_name_len;
764                 }
765         }
766 
767         spin_unlock_bh(&ipvs->sync_buff_lock);
768 
769 control:
770         /* synchronize its controller if it has */
771         cp = cp->control;
772         if (!cp)
773                 return;
774         if (cp->flags & IP_VS_CONN_F_TEMPLATE)
775                 pkts = atomic_add_return(1, &cp->in_pkts);
776         else
777                 pkts = sysctl_sync_threshold(ipvs);
778         goto sloop;
779 }
780 
781 /*
782  *  fill_param used by version 1
783  */
784 static inline int
785 ip_vs_conn_fill_param_sync(struct netns_ipvs *ipvs, int af, union ip_vs_sync_conn *sc,
786                            struct ip_vs_conn_param *p,
787                            __u8 *pe_data, unsigned int pe_data_len,
788                            __u8 *pe_name, unsigned int pe_name_len)
789 {
790 #ifdef CONFIG_IP_VS_IPV6
791         if (af == AF_INET6)
792                 ip_vs_conn_fill_param(ipvs, af, sc->v6.protocol,
793                                       (const union nf_inet_addr *)&sc->v6.caddr,
794                                       sc->v6.cport,
795                                       (const union nf_inet_addr *)&sc->v6.vaddr,
796                                       sc->v6.vport, p);
797         else
798 #endif
799                 ip_vs_conn_fill_param(ipvs, af, sc->v4.protocol,
800                                       (const union nf_inet_addr *)&sc->v4.caddr,
801                                       sc->v4.cport,
802                                       (const union nf_inet_addr *)&sc->v4.vaddr,
803                                       sc->v4.vport, p);
804         /* Handle pe data */
805         if (pe_data_len) {
806                 if (pe_name_len) {
807                         char buff[IP_VS_PENAME_MAXLEN+1];
808 
809                         memcpy(buff, pe_name, pe_name_len);
810                         buff[pe_name_len]=0;
811                         p->pe = __ip_vs_pe_getbyname(buff);
812                         if (!p->pe) {
813                                 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
814                                              buff);
815                                 return 1;
816                         }
817                 } else {
818                         IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
819                         return 1;
820                 }
821 
822                 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
823                 if (!p->pe_data) {
824                         module_put(p->pe->module);
825                         return -ENOMEM;
826                 }
827                 p->pe_data_len = pe_data_len;
828         }
829         return 0;
830 }
831 
832 /*
833  *  Connection Add / Update.
834  *  Common for version 0 and 1 reception of backup sync_conns.
835  *  Param: ...
836  *         timeout is in sec.
837  */
838 static void ip_vs_proc_conn(struct netns_ipvs *ipvs, struct ip_vs_conn_param *param,
839                             unsigned int flags, unsigned int state,
840                             unsigned int protocol, unsigned int type,
841                             const union nf_inet_addr *daddr, __be16 dport,
842                             unsigned long timeout, __u32 fwmark,
843                             struct ip_vs_sync_conn_options *opt)
844 {
845         struct ip_vs_dest *dest;
846         struct ip_vs_conn *cp;
847 
848         if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
849                 cp = ip_vs_conn_in_get(param);
850                 if (cp && ((cp->dport != dport) ||
851                            !ip_vs_addr_equal(cp->daf, &cp->daddr, daddr))) {
852                         if (!(flags & IP_VS_CONN_F_INACTIVE)) {
853                                 ip_vs_conn_expire_now(cp);
854                                 __ip_vs_conn_put(cp);
855                                 cp = NULL;
856                         } else {
857                                 /* This is the expiration message for the
858                                  * connection that was already replaced, so we
859                                  * just ignore it.
860                                  */
861                                 __ip_vs_conn_put(cp);
862                                 kfree(param->pe_data);
863                                 return;
864                         }
865                 }
866         } else {
867                 cp = ip_vs_ct_in_get(param);
868         }
869 
870         if (cp) {
871                 /* Free pe_data */
872                 kfree(param->pe_data);
873 
874                 dest = cp->dest;
875                 spin_lock_bh(&cp->lock);
876                 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
877                     !(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
878                         if (flags & IP_VS_CONN_F_INACTIVE) {
879                                 atomic_dec(&dest->activeconns);
880                                 atomic_inc(&dest->inactconns);
881                         } else {
882                                 atomic_inc(&dest->activeconns);
883                                 atomic_dec(&dest->inactconns);
884                         }
885                 }
886                 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
887                 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
888                 cp->flags = flags;
889                 spin_unlock_bh(&cp->lock);
890                 if (!dest)
891                         ip_vs_try_bind_dest(cp);
892         } else {
893                 /*
894                  * Find the appropriate destination for the connection.
895                  * If it is not found the connection will remain unbound
896                  * but still handled.
897                  */
898                 rcu_read_lock();
899                 /* This function is only invoked by the synchronization
900                  * code. We do not currently support heterogeneous pools
901                  * with synchronization, so we can make the assumption that
902                  * the svc_af is the same as the dest_af
903                  */
904                 dest = ip_vs_find_dest(ipvs, type, type, daddr, dport,
905                                        param->vaddr, param->vport, protocol,
906                                        fwmark, flags);
907 
908                 cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest,
909                                     fwmark);
910                 rcu_read_unlock();
911                 if (!cp) {
912                         kfree(param->pe_data);
913                         IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
914                         return;
915                 }
916                 if (!(flags & IP_VS_CONN_F_TEMPLATE))
917                         kfree(param->pe_data);
918         }
919 
920         if (opt)
921                 memcpy(&cp->in_seq, opt, sizeof(*opt));
922         atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
923         cp->state = state;
924         cp->old_state = cp->state;
925         /*
926          * For Ver 0 messages style
927          *  - Not possible to recover the right timeout for templates
928          *  - can not find the right fwmark
929          *    virtual service. If needed, we can do it for
930          *    non-fwmark persistent services.
931          * Ver 1 messages style.
932          *  - No problem.
933          */
934         if (timeout) {
935                 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
936                         timeout = MAX_SCHEDULE_TIMEOUT / HZ;
937                 cp->timeout = timeout*HZ;
938         } else {
939                 struct ip_vs_proto_data *pd;
940 
941                 pd = ip_vs_proto_data_get(ipvs, protocol);
942                 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
943                         cp->timeout = pd->timeout_table[state];
944                 else
945                         cp->timeout = (3*60*HZ);
946         }
947         ip_vs_conn_put(cp);
948 }
949 
950 /*
951  *  Process received multicast message for Version 0
952  */
953 static void ip_vs_process_message_v0(struct netns_ipvs *ipvs, const char *buffer,
954                                      const size_t buflen)
955 {
956         struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
957         struct ip_vs_sync_conn_v0 *s;
958         struct ip_vs_sync_conn_options *opt;
959         struct ip_vs_protocol *pp;
960         struct ip_vs_conn_param param;
961         char *p;
962         int i;
963 
964         p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
965         for (i=0; i<m->nr_conns; i++) {
966                 unsigned int flags, state;
967 
968                 if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
969                         IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
970                         return;
971                 }
972                 s = (struct ip_vs_sync_conn_v0 *) p;
973                 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
974                 flags &= ~IP_VS_CONN_F_HASHED;
975                 if (flags & IP_VS_CONN_F_SEQ_MASK) {
976                         opt = (struct ip_vs_sync_conn_options *)&s[1];
977                         p += FULL_CONN_SIZE;
978                         if (p > buffer+buflen) {
979                                 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
980                                 return;
981                         }
982                 } else {
983                         opt = NULL;
984                         p += SIMPLE_CONN_SIZE;
985                 }
986 
987                 state = ntohs(s->state);
988                 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
989                         pp = ip_vs_proto_get(s->protocol);
990                         if (!pp) {
991                                 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
992                                         s->protocol);
993                                 continue;
994                         }
995                         if (state >= pp->num_states) {
996                                 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
997                                         pp->name, state);
998                                 continue;
999                         }
1000                 } else {
1001                         /* protocol in templates is not used for state/timeout */
1002                         if (state > 0) {
1003                                 IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n",
1004                                         state);
1005                                 state = 0;
1006                         }
1007                 }
1008 
1009                 ip_vs_conn_fill_param(ipvs, AF_INET, s->protocol,
1010                                       (const union nf_inet_addr *)&s->caddr,
1011                                       s->cport,
1012                                       (const union nf_inet_addr *)&s->vaddr,
1013                                       s->vport, &param);
1014 
1015                 /* Send timeout as Zero */
1016                 ip_vs_proc_conn(ipvs, &param, flags, state, s->protocol, AF_INET,
1017                                 (union nf_inet_addr *)&s->daddr, s->dport,
1018                                 0, 0, opt);
1019         }
1020 }
1021 
1022 /*
1023  * Handle options
1024  */
1025 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
1026                                     __u32 *opt_flags,
1027                                     struct ip_vs_sync_conn_options *opt)
1028 {
1029         struct ip_vs_sync_conn_options *topt;
1030 
1031         topt = (struct ip_vs_sync_conn_options *)p;
1032 
1033         if (plen != sizeof(struct ip_vs_sync_conn_options)) {
1034                 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1035                 return -EINVAL;
1036         }
1037         if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
1038                 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1039                 return -EINVAL;
1040         }
1041         ntoh_seq(&topt->in_seq, &opt->in_seq);
1042         ntoh_seq(&topt->out_seq, &opt->out_seq);
1043         *opt_flags |= IPVS_OPT_F_SEQ_DATA;
1044         return 0;
1045 }
1046 
1047 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
1048                           __u8 **data, unsigned int maxlen,
1049                           __u32 *opt_flags, __u32 flag)
1050 {
1051         if (plen > maxlen) {
1052                 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
1053                 return -EINVAL;
1054         }
1055         if (*opt_flags & flag) {
1056                 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
1057                 return -EINVAL;
1058         }
1059         *data_len = plen;
1060         *data = p;
1061         *opt_flags |= flag;
1062         return 0;
1063 }
1064 /*
1065  *   Process a Version 1 sync. connection
1066  */
1067 static inline int ip_vs_proc_sync_conn(struct netns_ipvs *ipvs, __u8 *p, __u8 *msg_end)
1068 {
1069         struct ip_vs_sync_conn_options opt;
1070         union  ip_vs_sync_conn *s;
1071         struct ip_vs_protocol *pp;
1072         struct ip_vs_conn_param param;
1073         __u32 flags;
1074         unsigned int af, state, pe_data_len=0, pe_name_len=0;
1075         __u8 *pe_data=NULL, *pe_name=NULL;
1076         __u32 opt_flags=0;
1077         int retc=0;
1078 
1079         s = (union ip_vs_sync_conn *) p;
1080 
1081         if (s->v6.type & STYPE_F_INET6) {
1082 #ifdef CONFIG_IP_VS_IPV6
1083                 af = AF_INET6;
1084                 p += sizeof(struct ip_vs_sync_v6);
1085 #else
1086                 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1087                 retc = 10;
1088                 goto out;
1089 #endif
1090         } else if (!s->v4.type) {
1091                 af = AF_INET;
1092                 p += sizeof(struct ip_vs_sync_v4);
1093         } else {
1094                 return -10;
1095         }
1096         if (p > msg_end)
1097                 return -20;
1098 
1099         /* Process optional params check Type & Len. */
1100         while (p < msg_end) {
1101                 int ptype;
1102                 int plen;
1103 
1104                 if (p+2 > msg_end)
1105                         return -30;
1106                 ptype = *(p++);
1107                 plen  = *(p++);
1108 
1109                 if (!plen || ((p + plen) > msg_end))
1110                         return -40;
1111                 /* Handle seq option  p = param data */
1112                 switch (ptype & ~IPVS_OPT_F_PARAM) {
1113                 case IPVS_OPT_SEQ_DATA:
1114                         if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
1115                                 return -50;
1116                         break;
1117 
1118                 case IPVS_OPT_PE_DATA:
1119                         if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
1120                                            IP_VS_PEDATA_MAXLEN, &opt_flags,
1121                                            IPVS_OPT_F_PE_DATA))
1122                                 return -60;
1123                         break;
1124 
1125                 case IPVS_OPT_PE_NAME:
1126                         if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
1127                                            IP_VS_PENAME_MAXLEN, &opt_flags,
1128                                            IPVS_OPT_F_PE_NAME))
1129                                 return -70;
1130                         break;
1131 
1132                 default:
1133                         /* Param data mandatory ? */
1134                         if (!(ptype & IPVS_OPT_F_PARAM)) {
1135                                 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1136                                           ptype & ~IPVS_OPT_F_PARAM);
1137                                 retc = 20;
1138                                 goto out;
1139                         }
1140                 }
1141                 p += plen;  /* Next option */
1142         }
1143 
1144         /* Get flags and Mask off unsupported */
1145         flags  = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
1146         flags |= IP_VS_CONN_F_SYNC;
1147         state = ntohs(s->v4.state);
1148 
1149         if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
1150                 pp = ip_vs_proto_get(s->v4.protocol);
1151                 if (!pp) {
1152                         IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1153                                 s->v4.protocol);
1154                         retc = 30;
1155                         goto out;
1156                 }
1157                 if (state >= pp->num_states) {
1158                         IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1159                                 pp->name, state);
1160                         retc = 40;
1161                         goto out;
1162                 }
1163         } else {
1164                 /* protocol in templates is not used for state/timeout */
1165                 if (state > 0) {
1166                         IP_VS_DBG(3, "BACKUP, Invalid template state %u\n",
1167                                 state);
1168                         state = 0;
1169                 }
1170         }
1171         if (ip_vs_conn_fill_param_sync(ipvs, af, s, &param, pe_data,
1172                                        pe_data_len, pe_name, pe_name_len)) {
1173                 retc = 50;
1174                 goto out;
1175         }
1176         /* If only IPv4, just silent skip IPv6 */
1177         if (af == AF_INET)
1178                 ip_vs_proc_conn(ipvs, &param, flags, state, s->v4.protocol, af,
1179                                 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
1180                                 ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
1181                                 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1182                                 );
1183 #ifdef CONFIG_IP_VS_IPV6
1184         else
1185                 ip_vs_proc_conn(ipvs, &param, flags, state, s->v6.protocol, af,
1186                                 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
1187                                 ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
1188                                 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1189                                 );
1190 #endif
1191         ip_vs_pe_put(param.pe);
1192         return 0;
1193         /* Error exit */
1194 out:
1195         IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc);
1196         return retc;
1197 
1198 }
1199 /*
1200  *      Process received multicast message and create the corresponding
1201  *      ip_vs_conn entries.
1202  *      Handles Version 0 & 1
1203  */
1204 static void ip_vs_process_message(struct netns_ipvs *ipvs, __u8 *buffer,
1205                                   const size_t buflen)
1206 {
1207         struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
1208         __u8 *p, *msg_end;
1209         int i, nr_conns;
1210 
1211         if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
1212                 IP_VS_DBG(2, "BACKUP, message header too short\n");
1213                 return;
1214         }
1215 
1216         if (buflen != ntohs(m2->size)) {
1217                 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1218                 return;
1219         }
1220         /* SyncID sanity check */
1221         if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
1222                 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
1223                 return;
1224         }
1225         /* Handle version 1  message */
1226         if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
1227             && (m2->spare == 0)) {
1228 
1229                 msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
1230                 nr_conns = m2->nr_conns;
1231 
1232                 for (i=0; i<nr_conns; i++) {
1233                         union ip_vs_sync_conn *s;
1234                         unsigned int size;
1235                         int retc;
1236 
1237                         p = msg_end;
1238                         if (p + sizeof(s->v4) > buffer+buflen) {
1239                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n");
1240                                 return;
1241                         }
1242                         s = (union ip_vs_sync_conn *)p;
1243                         size = ntohs(s->v4.ver_size) & SVER_MASK;
1244                         msg_end = p + size;
1245                         /* Basic sanity checks */
1246                         if (msg_end  > buffer+buflen) {
1247                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1248                                 return;
1249                         }
1250                         if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
1251                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1252                                               ntohs(s->v4.ver_size) >> SVER_SHIFT);
1253                                 return;
1254                         }
1255                         /* Process a single sync_conn */
1256                         retc = ip_vs_proc_sync_conn(ipvs, p, msg_end);
1257                         if (retc < 0) {
1258                                 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1259                                              retc);
1260                                 return;
1261                         }
1262                         /* Make sure we have 32 bit alignment */
1263                         msg_end = p + ((size + 3) & ~3);
1264                 }
1265         } else {
1266                 /* Old type of message */
1267                 ip_vs_process_message_v0(ipvs, buffer, buflen);
1268                 return;
1269         }
1270 }
1271 
1272 
1273 /*
1274  *      Setup sndbuf (mode=1) or rcvbuf (mode=0)
1275  */
1276 static void set_sock_size(struct sock *sk, int mode, int val)
1277 {
1278         /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1279         /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1280         lock_sock(sk);
1281         if (mode) {
1282                 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
1283                               sysctl_wmem_max);
1284                 sk->sk_sndbuf = val * 2;
1285                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1286         } else {
1287                 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
1288                               sysctl_rmem_max);
1289                 sk->sk_rcvbuf = val * 2;
1290                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1291         }
1292         release_sock(sk);
1293 }
1294 
1295 /*
1296  *      Setup loopback of outgoing multicasts on a sending socket
1297  */
1298 static void set_mcast_loop(struct sock *sk, u_char loop)
1299 {
1300         struct inet_sock *inet = inet_sk(sk);
1301 
1302         /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1303         lock_sock(sk);
1304         inet->mc_loop = loop ? 1 : 0;
1305 #ifdef CONFIG_IP_VS_IPV6
1306         if (sk->sk_family == AF_INET6) {
1307                 struct ipv6_pinfo *np = inet6_sk(sk);
1308 
1309                 /* IPV6_MULTICAST_LOOP */
1310                 np->mc_loop = loop ? 1 : 0;
1311         }
1312 #endif
1313         release_sock(sk);
1314 }
1315 
1316 /*
1317  *      Specify TTL for outgoing multicasts on a sending socket
1318  */
1319 static void set_mcast_ttl(struct sock *sk, u_char ttl)
1320 {
1321         struct inet_sock *inet = inet_sk(sk);
1322 
1323         /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1324         lock_sock(sk);
1325         inet->mc_ttl = ttl;
1326 #ifdef CONFIG_IP_VS_IPV6
1327         if (sk->sk_family == AF_INET6) {
1328                 struct ipv6_pinfo *np = inet6_sk(sk);
1329 
1330                 /* IPV6_MULTICAST_HOPS */
1331                 np->mcast_hops = ttl;
1332         }
1333 #endif
1334         release_sock(sk);
1335 }
1336 
1337 /* Control fragmentation of messages */
1338 static void set_mcast_pmtudisc(struct sock *sk, int val)
1339 {
1340         struct inet_sock *inet = inet_sk(sk);
1341 
1342         /* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
1343         lock_sock(sk);
1344         inet->pmtudisc = val;
1345 #ifdef CONFIG_IP_VS_IPV6
1346         if (sk->sk_family == AF_INET6) {
1347                 struct ipv6_pinfo *np = inet6_sk(sk);
1348 
1349                 /* IPV6_MTU_DISCOVER */
1350                 np->pmtudisc = val;
1351         }
1352 #endif
1353         release_sock(sk);
1354 }
1355 
1356 /*
1357  *      Specifiy default interface for outgoing multicasts
1358  */
1359 static int set_mcast_if(struct sock *sk, char *ifname)
1360 {
1361         struct net_device *dev;
1362         struct inet_sock *inet = inet_sk(sk);
1363         struct net *net = sock_net(sk);
1364 
1365         dev = __dev_get_by_name(net, ifname);
1366         if (!dev)
1367                 return -ENODEV;
1368 
1369         if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1370                 return -EINVAL;
1371 
1372         lock_sock(sk);
1373         inet->mc_index = dev->ifindex;
1374         /*  inet->mc_addr  = 0; */
1375 #ifdef CONFIG_IP_VS_IPV6
1376         if (sk->sk_family == AF_INET6) {
1377                 struct ipv6_pinfo *np = inet6_sk(sk);
1378 
1379                 /* IPV6_MULTICAST_IF */
1380                 np->mcast_oif = dev->ifindex;
1381         }
1382 #endif
1383         release_sock(sk);
1384 
1385         return 0;
1386 }
1387 
1388 
1389 /*
1390  *      Join a multicast group.
1391  *      the group is specified by a class D multicast address 224.0.0.0/8
1392  *      in the in_addr structure passed in as a parameter.
1393  */
1394 static int
1395 join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
1396 {
1397         struct net *net = sock_net(sk);
1398         struct ip_mreqn mreq;
1399         struct net_device *dev;
1400         int ret;
1401 
1402         memset(&mreq, 0, sizeof(mreq));
1403         memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
1404 
1405         dev = __dev_get_by_name(net, ifname);
1406         if (!dev)
1407                 return -ENODEV;
1408         if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1409                 return -EINVAL;
1410 
1411         mreq.imr_ifindex = dev->ifindex;
1412 
1413         lock_sock(sk);
1414         ret = ip_mc_join_group(sk, &mreq);
1415         release_sock(sk);
1416 
1417         return ret;
1418 }
1419 
1420 #ifdef CONFIG_IP_VS_IPV6
1421 static int join_mcast_group6(struct sock *sk, struct in6_addr *addr,
1422                              char *ifname)
1423 {
1424         struct net *net = sock_net(sk);
1425         struct net_device *dev;
1426         int ret;
1427 
1428         dev = __dev_get_by_name(net, ifname);
1429         if (!dev)
1430                 return -ENODEV;
1431         if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1432                 return -EINVAL;
1433 
1434         lock_sock(sk);
1435         ret = ipv6_sock_mc_join(sk, dev->ifindex, addr);
1436         release_sock(sk);
1437 
1438         return ret;
1439 }
1440 #endif
1441 
1442 static int bind_mcastif_addr(struct socket *sock, char *ifname)
1443 {
1444         struct net *net = sock_net(sock->sk);
1445         struct net_device *dev;
1446         __be32 addr;
1447         struct sockaddr_in sin;
1448 
1449         dev = __dev_get_by_name(net, ifname);
1450         if (!dev)
1451                 return -ENODEV;
1452 
1453         addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
1454         if (!addr)
1455                 pr_err("You probably need to specify IP address on "
1456                        "multicast interface.\n");
1457 
1458         IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1459                   ifname, &addr);
1460 
1461         /* Now bind the socket with the address of multicast interface */
1462         sin.sin_family       = AF_INET;
1463         sin.sin_addr.s_addr  = addr;
1464         sin.sin_port         = 0;
1465 
1466         return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
1467 }
1468 
1469 static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
1470                                struct ipvs_sync_daemon_cfg *c, int id)
1471 {
1472         if (AF_INET6 == c->mcast_af) {
1473                 sa->in6 = (struct sockaddr_in6) {
1474                         .sin6_family = AF_INET6,
1475                         .sin6_port = htons(c->mcast_port + id),
1476                 };
1477                 sa->in6.sin6_addr = c->mcast_group.in6;
1478                 *salen = sizeof(sa->in6);
1479         } else {
1480                 sa->in = (struct sockaddr_in) {
1481                         .sin_family = AF_INET,
1482                         .sin_port = htons(c->mcast_port + id),
1483                 };
1484                 sa->in.sin_addr = c->mcast_group.in;
1485                 *salen = sizeof(sa->in);
1486         }
1487 }
1488 
1489 /*
1490  *      Set up sending multicast socket over UDP
1491  */
1492 static struct socket *make_send_sock(struct netns_ipvs *ipvs, int id)
1493 {
1494         /* multicast addr */
1495         union ipvs_sockaddr mcast_addr;
1496         struct socket *sock;
1497         int result, salen;
1498 
1499         /* First create a socket */
1500         result = sock_create_kern(ipvs->net, ipvs->mcfg.mcast_af, SOCK_DGRAM,
1501                                   IPPROTO_UDP, &sock);
1502         if (result < 0) {
1503                 pr_err("Error during creation of socket; terminating\n");
1504                 return ERR_PTR(result);
1505         }
1506         result = set_mcast_if(sock->sk, ipvs->mcfg.mcast_ifn);
1507         if (result < 0) {
1508                 pr_err("Error setting outbound mcast interface\n");
1509                 goto error;
1510         }
1511 
1512         set_mcast_loop(sock->sk, 0);
1513         set_mcast_ttl(sock->sk, ipvs->mcfg.mcast_ttl);
1514         /* Allow fragmentation if MTU changes */
1515         set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
1516         result = sysctl_sync_sock_size(ipvs);
1517         if (result > 0)
1518                 set_sock_size(sock->sk, 1, result);
1519 
1520         if (AF_INET == ipvs->mcfg.mcast_af)
1521                 result = bind_mcastif_addr(sock, ipvs->mcfg.mcast_ifn);
1522         else
1523                 result = 0;
1524         if (result < 0) {
1525                 pr_err("Error binding address of the mcast interface\n");
1526                 goto error;
1527         }
1528 
1529         get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->mcfg, id);
1530         result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
1531                                     salen, 0);
1532         if (result < 0) {
1533                 pr_err("Error connecting to the multicast addr\n");
1534                 goto error;
1535         }
1536 
1537         return sock;
1538 
1539 error:
1540         sock_release(sock);
1541         return ERR_PTR(result);
1542 }
1543 
1544 
1545 /*
1546  *      Set up receiving multicast socket over UDP
1547  */
1548 static struct socket *make_receive_sock(struct netns_ipvs *ipvs, int id)
1549 {
1550         /* multicast addr */
1551         union ipvs_sockaddr mcast_addr;
1552         struct socket *sock;
1553         int result, salen;
1554 
1555         /* First create a socket */
1556         result = sock_create_kern(ipvs->net, ipvs->bcfg.mcast_af, SOCK_DGRAM,
1557                                   IPPROTO_UDP, &sock);
1558         if (result < 0) {
1559                 pr_err("Error during creation of socket; terminating\n");
1560                 return ERR_PTR(result);
1561         }
1562         /* it is equivalent to the REUSEADDR option in user-space */
1563         sock->sk->sk_reuse = SK_CAN_REUSE;
1564         result = sysctl_sync_sock_size(ipvs);
1565         if (result > 0)
1566                 set_sock_size(sock->sk, 0, result);
1567 
1568         get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
1569         result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
1570         if (result < 0) {
1571                 pr_err("Error binding to the multicast addr\n");
1572                 goto error;
1573         }
1574 
1575         /* join the multicast group */
1576 #ifdef CONFIG_IP_VS_IPV6
1577         if (ipvs->bcfg.mcast_af == AF_INET6)
1578                 result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr,
1579                                            ipvs->bcfg.mcast_ifn);
1580         else
1581 #endif
1582                 result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr,
1583                                           ipvs->bcfg.mcast_ifn);
1584         if (result < 0) {
1585                 pr_err("Error joining to the multicast group\n");
1586                 goto error;
1587         }
1588 
1589         return sock;
1590 
1591 error:
1592         sock_release(sock);
1593         return ERR_PTR(result);
1594 }
1595 
1596 
1597 static int
1598 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
1599 {
1600         struct msghdr   msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
1601         struct kvec     iov;
1602         int             len;
1603 
1604         EnterFunction(7);
1605         iov.iov_base     = (void *)buffer;
1606         iov.iov_len      = length;
1607 
1608         len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
1609 
1610         LeaveFunction(7);
1611         return len;
1612 }
1613 
1614 static int
1615 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
1616 {
1617         int msize;
1618         int ret;
1619 
1620         msize = ntohs(msg->size);
1621 
1622         ret = ip_vs_send_async(sock, (char *)msg, msize);
1623         if (ret >= 0 || ret == -EAGAIN)
1624                 return ret;
1625         pr_err("ip_vs_send_async error %d\n", ret);
1626         return 0;
1627 }
1628 
1629 static int
1630 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
1631 {
1632         struct msghdr           msg = {NULL,};
1633         struct kvec             iov;
1634         int                     len;
1635 
1636         EnterFunction(7);
1637 
1638         /* Receive a packet */
1639         iov.iov_base     = buffer;
1640         iov.iov_len      = (size_t)buflen;
1641 
1642         len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, MSG_DONTWAIT);
1643 
1644         if (len < 0)
1645                 return len;
1646 
1647         LeaveFunction(7);
1648         return len;
1649 }
1650 
1651 /* Wakeup the master thread for sending */
1652 static void master_wakeup_work_handler(struct work_struct *work)
1653 {
1654         struct ipvs_master_sync_state *ms =
1655                 container_of(work, struct ipvs_master_sync_state,
1656                              master_wakeup_work.work);
1657         struct netns_ipvs *ipvs = ms->ipvs;
1658 
1659         spin_lock_bh(&ipvs->sync_lock);
1660         if (ms->sync_queue_len &&
1661             ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
1662                 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
1663                 wake_up_process(ms->master_thread);
1664         }
1665         spin_unlock_bh(&ipvs->sync_lock);
1666 }
1667 
1668 /* Get next buffer to send */
1669 static inline struct ip_vs_sync_buff *
1670 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
1671 {
1672         struct ip_vs_sync_buff *sb;
1673 
1674         sb = sb_dequeue(ipvs, ms);
1675         if (sb)
1676                 return sb;
1677         /* Do not delay entries in buffer for more than 2 seconds */
1678         return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
1679 }
1680 
1681 static int sync_thread_master(void *data)
1682 {
1683         struct ip_vs_sync_thread_data *tinfo = data;
1684         struct netns_ipvs *ipvs = tinfo->ipvs;
1685         struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
1686         struct sock *sk = tinfo->sock->sk;
1687         struct ip_vs_sync_buff *sb;
1688 
1689         pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1690                 "syncid = %d, id = %d\n",
1691                 ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
1692 
1693         for (;;) {
1694                 sb = next_sync_buff(ipvs, ms);
1695                 if (unlikely(kthread_should_stop()))
1696                         break;
1697                 if (!sb) {
1698                         schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
1699                         continue;
1700                 }
1701                 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
1702                         /* (Ab)use interruptible sleep to avoid increasing
1703                          * the load avg.
1704                          */
1705                         __wait_event_interruptible(*sk_sleep(sk),
1706                                                    sock_writeable(sk) ||
1707                                                    kthread_should_stop());
1708                         if (unlikely(kthread_should_stop()))
1709                                 goto done;
1710                 }
1711                 ip_vs_sync_buff_release(sb);
1712         }
1713 
1714 done:
1715         __set_current_state(TASK_RUNNING);
1716         if (sb)
1717                 ip_vs_sync_buff_release(sb);
1718 
1719         /* clean up the sync_buff queue */
1720         while ((sb = sb_dequeue(ipvs, ms)))
1721                 ip_vs_sync_buff_release(sb);
1722         __set_current_state(TASK_RUNNING);
1723 
1724         /* clean up the current sync_buff */
1725         sb = get_curr_sync_buff(ipvs, ms, 0);
1726         if (sb)
1727                 ip_vs_sync_buff_release(sb);
1728 
1729         /* release the sending multicast socket */
1730         sock_release(tinfo->sock);
1731         kfree(tinfo);
1732 
1733         return 0;
1734 }
1735 
1736 
1737 static int sync_thread_backup(void *data)
1738 {
1739         struct ip_vs_sync_thread_data *tinfo = data;
1740         struct netns_ipvs *ipvs = tinfo->ipvs;
1741         int len;
1742 
1743         pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1744                 "syncid = %d, id = %d\n",
1745                 ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
1746 
1747         while (!kthread_should_stop()) {
1748                 wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
1749                          !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
1750                          || kthread_should_stop());
1751 
1752                 /* do we have data now? */
1753                 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
1754                         len = ip_vs_receive(tinfo->sock, tinfo->buf,
1755                                         ipvs->bcfg.sync_maxlen);
1756                         if (len <= 0) {
1757                                 if (len != -EAGAIN)
1758                                         pr_err("receiving message error\n");
1759                                 break;
1760                         }
1761 
1762                         ip_vs_process_message(ipvs, tinfo->buf, len);
1763                 }
1764         }
1765 
1766         /* release the sending multicast socket */
1767         sock_release(tinfo->sock);
1768         kfree(tinfo->buf);
1769         kfree(tinfo);
1770 
1771         return 0;
1772 }
1773 
1774 
1775 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
1776                       int state)
1777 {
1778         struct ip_vs_sync_thread_data *tinfo;
1779         struct task_struct **array = NULL, *task;
1780         struct socket *sock;
1781         struct net_device *dev;
1782         char *name;
1783         int (*threadfn)(void *data);
1784         int id, count, hlen;
1785         int result = -ENOMEM;
1786         u16 mtu, min_mtu;
1787 
1788         IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1789         IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
1790                   sizeof(struct ip_vs_sync_conn_v0));
1791 
1792         if (!ipvs->sync_state) {
1793                 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
1794                 ipvs->threads_mask = count - 1;
1795         } else
1796                 count = ipvs->threads_mask + 1;
1797 
1798         if (c->mcast_af == AF_UNSPEC) {
1799                 c->mcast_af = AF_INET;
1800                 c->mcast_group.ip = cpu_to_be32(IP_VS_SYNC_GROUP);
1801         }
1802         if (!c->mcast_port)
1803                 c->mcast_port = IP_VS_SYNC_PORT;
1804         if (!c->mcast_ttl)
1805                 c->mcast_ttl = 1;
1806 
1807         dev = __dev_get_by_name(ipvs->net, c->mcast_ifn);
1808         if (!dev) {
1809                 pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
1810                 return -ENODEV;
1811         }
1812         hlen = (AF_INET6 == c->mcast_af) ?
1813                sizeof(struct ipv6hdr) + sizeof(struct udphdr) :
1814                sizeof(struct iphdr) + sizeof(struct udphdr);
1815         mtu = (state == IP_VS_STATE_BACKUP) ?
1816                   clamp(dev->mtu, 1500U, 65535U) : 1500U;
1817         min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
1818 
1819         if (c->sync_maxlen)
1820                 c->sync_maxlen = clamp_t(unsigned int,
1821                                          c->sync_maxlen, min_mtu,
1822                                          65535 - hlen);
1823         else
1824                 c->sync_maxlen = mtu - hlen;
1825 
1826         if (state == IP_VS_STATE_MASTER) {
1827                 if (ipvs->ms)
1828                         return -EEXIST;
1829 
1830                 ipvs->mcfg = *c;
1831                 name = "ipvs-m:%d:%d";
1832                 threadfn = sync_thread_master;
1833         } else if (state == IP_VS_STATE_BACKUP) {
1834                 if (ipvs->backup_threads)
1835                         return -EEXIST;
1836 
1837                 ipvs->bcfg = *c;
1838                 name = "ipvs-b:%d:%d";
1839                 threadfn = sync_thread_backup;
1840         } else {
1841                 return -EINVAL;
1842         }
1843 
1844         if (state == IP_VS_STATE_MASTER) {
1845                 struct ipvs_master_sync_state *ms;
1846 
1847                 ipvs->ms = kzalloc(count * sizeof(ipvs->ms[0]), GFP_KERNEL);
1848                 if (!ipvs->ms)
1849                         goto out;
1850                 ms = ipvs->ms;
1851                 for (id = 0; id < count; id++, ms++) {
1852                         INIT_LIST_HEAD(&ms->sync_queue);
1853                         ms->sync_queue_len = 0;
1854                         ms->sync_queue_delay = 0;
1855                         INIT_DELAYED_WORK(&ms->master_wakeup_work,
1856                                           master_wakeup_work_handler);
1857                         ms->ipvs = ipvs;
1858                 }
1859         } else {
1860                 array = kzalloc(count * sizeof(struct task_struct *),
1861                                 GFP_KERNEL);
1862                 if (!array)
1863                         goto out;
1864         }
1865 
1866         tinfo = NULL;
1867         for (id = 0; id < count; id++) {
1868                 if (state == IP_VS_STATE_MASTER)
1869                         sock = make_send_sock(ipvs, id);
1870                 else
1871                         sock = make_receive_sock(ipvs, id);
1872                 if (IS_ERR(sock)) {
1873                         result = PTR_ERR(sock);
1874                         goto outtinfo;
1875                 }
1876                 tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
1877                 if (!tinfo)
1878                         goto outsocket;
1879                 tinfo->ipvs = ipvs;
1880                 tinfo->sock = sock;
1881                 if (state == IP_VS_STATE_BACKUP) {
1882                         tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
1883                                              GFP_KERNEL);
1884                         if (!tinfo->buf)
1885                                 goto outtinfo;
1886                 } else {
1887                         tinfo->buf = NULL;
1888                 }
1889                 tinfo->id = id;
1890 
1891                 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
1892                 if (IS_ERR(task)) {
1893                         result = PTR_ERR(task);
1894                         goto outtinfo;
1895                 }
1896                 tinfo = NULL;
1897                 if (state == IP_VS_STATE_MASTER)
1898                         ipvs->ms[id].master_thread = task;
1899                 else
1900                         array[id] = task;
1901         }
1902 
1903         /* mark as active */
1904 
1905         if (state == IP_VS_STATE_BACKUP)
1906                 ipvs->backup_threads = array;
1907         spin_lock_bh(&ipvs->sync_buff_lock);
1908         ipvs->sync_state |= state;
1909         spin_unlock_bh(&ipvs->sync_buff_lock);
1910 
1911         /* increase the module use count */
1912         ip_vs_use_count_inc();
1913 
1914         return 0;
1915 
1916 outsocket:
1917         sock_release(sock);
1918 
1919 outtinfo:
1920         if (tinfo) {
1921                 sock_release(tinfo->sock);
1922                 kfree(tinfo->buf);
1923                 kfree(tinfo);
1924         }
1925         count = id;
1926         while (count-- > 0) {
1927                 if (state == IP_VS_STATE_MASTER)
1928                         kthread_stop(ipvs->ms[count].master_thread);
1929                 else
1930                         kthread_stop(array[count]);
1931         }
1932         kfree(array);
1933 
1934 out:
1935         if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
1936                 kfree(ipvs->ms);
1937                 ipvs->ms = NULL;
1938         }
1939         return result;
1940 }
1941 
1942 
1943 int stop_sync_thread(struct netns_ipvs *ipvs, int state)
1944 {
1945         struct task_struct **array;
1946         int id;
1947         int retc = -EINVAL;
1948 
1949         IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1950 
1951         if (state == IP_VS_STATE_MASTER) {
1952                 if (!ipvs->ms)
1953                         return -ESRCH;
1954 
1955                 /*
1956                  * The lock synchronizes with sb_queue_tail(), so that we don't
1957                  * add sync buffers to the queue, when we are already in
1958                  * progress of stopping the master sync daemon.
1959                  */
1960 
1961                 spin_lock_bh(&ipvs->sync_buff_lock);
1962                 spin_lock(&ipvs->sync_lock);
1963                 ipvs->sync_state &= ~IP_VS_STATE_MASTER;
1964                 spin_unlock(&ipvs->sync_lock);
1965                 spin_unlock_bh(&ipvs->sync_buff_lock);
1966 
1967                 retc = 0;
1968                 for (id = ipvs->threads_mask; id >= 0; id--) {
1969                         struct ipvs_master_sync_state *ms = &ipvs->ms[id];
1970                         int ret;
1971 
1972                         pr_info("stopping master sync thread %d ...\n",
1973                                 task_pid_nr(ms->master_thread));
1974                         cancel_delayed_work_sync(&ms->master_wakeup_work);
1975                         ret = kthread_stop(ms->master_thread);
1976                         if (retc >= 0)
1977                                 retc = ret;
1978                 }
1979                 kfree(ipvs->ms);
1980                 ipvs->ms = NULL;
1981         } else if (state == IP_VS_STATE_BACKUP) {
1982                 if (!ipvs->backup_threads)
1983                         return -ESRCH;
1984 
1985                 ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
1986                 array = ipvs->backup_threads;
1987                 retc = 0;
1988                 for (id = ipvs->threads_mask; id >= 0; id--) {
1989                         int ret;
1990 
1991                         pr_info("stopping backup sync thread %d ...\n",
1992                                 task_pid_nr(array[id]));
1993                         ret = kthread_stop(array[id]);
1994                         if (retc >= 0)
1995                                 retc = ret;
1996                 }
1997                 kfree(array);
1998                 ipvs->backup_threads = NULL;
1999         }
2000 
2001         /* decrease the module use count */
2002         ip_vs_use_count_dec();
2003 
2004         return retc;
2005 }
2006 
2007 /*
2008  * Initialize data struct for each netns
2009  */
2010 int __net_init ip_vs_sync_net_init(struct netns_ipvs *ipvs)
2011 {
2012         __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
2013         spin_lock_init(&ipvs->sync_lock);
2014         spin_lock_init(&ipvs->sync_buff_lock);
2015         return 0;
2016 }
2017 
2018 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs)
2019 {
2020         int retc;
2021 
2022         mutex_lock(&ipvs->sync_mutex);
2023         retc = stop_sync_thread(ipvs, IP_VS_STATE_MASTER);
2024         if (retc && retc != -ESRCH)
2025                 pr_err("Failed to stop Master Daemon\n");
2026 
2027         retc = stop_sync_thread(ipvs, IP_VS_STATE_BACKUP);
2028         if (retc && retc != -ESRCH)
2029                 pr_err("Failed to stop Backup Daemon\n");
2030         mutex_unlock(&ipvs->sync_mutex);
2031 }
2032 

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