1 // SPDX-License-Identifier: GPL-2.0
3 * IPVS An implementation of the IP virtual server support for the
4 * LINUX operating system. IPVS is now implemented as a module
5 * over the NetFilter framework. IPVS can be used to build a
6 * high-performance and highly available server based on a
9 * Version 1, is capable of handling both version 0 and 1 messages.
10 * Version 0 is the plain old format.
11 * Note Version 0 receivers will just drop Ver 1 messages.
12 * Version 1 is capable of handle IPv6, Persistence data,
13 * time-outs, and firewall marks.
14 * In ver.1 "ip_vs_sync_conn_options" will be sent in netw. order.
15 * Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0
17 * Definitions Message: is a complete datagram
18 * Sync_conn: is a part of a Message
19 * Param Data is an option to a Sync_conn.
21 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
23 * ip_vs_sync: sync connection info from master load balancer to backups
27 * Alexandre Cassen : Added master & backup support at a time.
28 * Alexandre Cassen : Added SyncID support for incoming sync
30 * Justin Ossevoort : Fix endian problem on sync message size.
31 * Hans Schillstrom : Added Version 1: i.e. IPv6,
32 * Persistence support, fwmark and time-out.
35 #define KMSG_COMPONENT "IPVS"
36 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
38 #include <linux/module.h>
39 #include <linux/slab.h>
40 #include <linux/inetdevice.h>
41 #include <linux/net.h>
42 #include <linux/completion.h>
43 #include <linux/delay.h>
44 #include <linux/skbuff.h>
46 #include <linux/igmp.h> /* for ip_mc_join_group */
47 #include <linux/udp.h>
48 #include <linux/err.h>
49 #include <linux/kthread.h>
50 #include <linux/wait.h>
51 #include <linux/kernel.h>
52 #include <linux/sched/signal.h>
54 #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */
59 #include <net/ip_vs.h>
61 #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */
62 #define IP_VS_SYNC_PORT 8848 /* multicast port */
64 #define SYNC_PROTO_VER 1 /* Protocol version in header */
66 static struct lock_class_key __ipvs_sync_key
;
68 * IPVS sync connection entry
69 * Version 0, i.e. original version.
71 struct ip_vs_sync_conn_v0
{
74 /* Protocol, addresses and port numbers */
75 __u8 protocol
; /* Which protocol (TCP/UDP) */
79 __be32 caddr
; /* client address */
80 __be32 vaddr
; /* virtual address */
81 __be32 daddr
; /* destination address */
83 /* Flags and state transition */
84 __be16 flags
; /* status flags */
85 __be16 state
; /* state info */
87 /* The sequence options start here */
90 struct ip_vs_sync_conn_options
{
91 struct ip_vs_seq in_seq
; /* incoming seq. struct */
92 struct ip_vs_seq out_seq
; /* outgoing seq. struct */
96 Sync Connection format (sync_conn)
99 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
100 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
101 | Type | Protocol | Ver. | Size |
102 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
104 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
106 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
110 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111 | timeout (in sec.) |
112 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
114 | IP-Addresses (v4 or v6) |
116 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
118 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
119 | Param. Type | Param. Length | Param. data |
120 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
122 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123 | | Param Type | Param. Length |
124 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
126 | Last Param data should be padded for 32 bit alignment |
127 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
131 * Type 0, IPv4 sync connection format
133 struct ip_vs_sync_v4
{
135 __u8 protocol
; /* Which protocol (TCP/UDP) */
136 __be16 ver_size
; /* Version msb 4 bits */
137 /* Flags and state transition */
138 __be32 flags
; /* status flags */
139 __be16 state
; /* state info */
140 /* Protocol, addresses and port numbers */
144 __be32 fwmark
; /* Firewall mark from skb */
145 __be32 timeout
; /* cp timeout */
146 __be32 caddr
; /* client address */
147 __be32 vaddr
; /* virtual address */
148 __be32 daddr
; /* destination address */
149 /* The sequence options start here */
150 /* PE data padded to 32bit alignment after seq. options */
153 * Type 2 messages IPv6
155 struct ip_vs_sync_v6
{
157 __u8 protocol
; /* Which protocol (TCP/UDP) */
158 __be16 ver_size
; /* Version msb 4 bits */
159 /* Flags and state transition */
160 __be32 flags
; /* status flags */
161 __be16 state
; /* state info */
162 /* Protocol, addresses and port numbers */
166 __be32 fwmark
; /* Firewall mark from skb */
167 __be32 timeout
; /* cp timeout */
168 struct in6_addr caddr
; /* client address */
169 struct in6_addr vaddr
; /* virtual address */
170 struct in6_addr daddr
; /* destination address */
171 /* The sequence options start here */
172 /* PE data padded to 32bit alignment after seq. options */
175 union ip_vs_sync_conn
{
176 struct ip_vs_sync_v4 v4
;
177 struct ip_vs_sync_v6 v6
;
180 /* Bits in Type field in above */
181 #define STYPE_INET6 0
182 #define STYPE_F_INET6 (1 << STYPE_INET6)
184 #define SVER_SHIFT 12 /* Shift to get version */
185 #define SVER_MASK 0x0fff /* Mask to strip version */
187 #define IPVS_OPT_SEQ_DATA 1
188 #define IPVS_OPT_PE_DATA 2
189 #define IPVS_OPT_PE_NAME 3
190 #define IPVS_OPT_PARAM 7
192 #define IPVS_OPT_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1))
193 #define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA-1))
194 #define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1))
195 #define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1))
197 struct ip_vs_sync_thread_data
{
198 struct netns_ipvs
*ipvs
;
204 /* Version 0 definition of packet sizes */
205 #define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0))
206 #define FULL_CONN_SIZE \
207 (sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options))
211 The master mulitcasts messages (Datagrams) to the backup load balancers
212 in the following format.
215 Note, first byte should be Zero, so ver 0 receivers will drop the packet.
218 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
219 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
220 | 0 | SyncID | Size |
221 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222 | Count Conns | Version | Reserved, set to Zero |
223 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
225 | IPVS Sync Connection (1) |
226 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
230 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
232 | IPVS Sync Connection (n) |
233 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
237 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
238 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
239 | Count Conns | SyncID | Size |
240 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
241 | IPVS Sync Connection (1) |
244 #define SYNC_MESG_HEADER_LEN 4
245 #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */
247 /* Version 0 header */
248 struct ip_vs_sync_mesg_v0
{
253 /* ip_vs_sync_conn entries start here */
256 /* Version 1 header */
257 struct ip_vs_sync_mesg
{
258 __u8 reserved
; /* must be zero */
262 __s8 version
; /* SYNC_PROTO_VER */
264 /* ip_vs_sync_conn entries start here */
267 union ipvs_sockaddr
{
268 struct sockaddr_in in
;
269 struct sockaddr_in6 in6
;
272 struct ip_vs_sync_buff
{
273 struct list_head list
;
274 unsigned long firstuse
;
276 /* pointers for the message data */
277 struct ip_vs_sync_mesg
*mesg
;
283 * Copy of struct ip_vs_seq
284 * From unaligned network order to aligned host order
286 static void ntoh_seq(struct ip_vs_seq
*no
, struct ip_vs_seq
*ho
)
288 memset(ho
, 0, sizeof(*ho
));
289 ho
->init_seq
= get_unaligned_be32(&no
->init_seq
);
290 ho
->delta
= get_unaligned_be32(&no
->delta
);
291 ho
->previous_delta
= get_unaligned_be32(&no
->previous_delta
);
295 * Copy of struct ip_vs_seq
296 * From Aligned host order to unaligned network order
298 static void hton_seq(struct ip_vs_seq
*ho
, struct ip_vs_seq
*no
)
300 put_unaligned_be32(ho
->init_seq
, &no
->init_seq
);
301 put_unaligned_be32(ho
->delta
, &no
->delta
);
302 put_unaligned_be32(ho
->previous_delta
, &no
->previous_delta
);
305 static inline struct ip_vs_sync_buff
*
306 sb_dequeue(struct netns_ipvs
*ipvs
, struct ipvs_master_sync_state
*ms
)
308 struct ip_vs_sync_buff
*sb
;
310 spin_lock_bh(&ipvs
->sync_lock
);
311 if (list_empty(&ms
->sync_queue
)) {
313 __set_current_state(TASK_INTERRUPTIBLE
);
315 sb
= list_entry(ms
->sync_queue
.next
, struct ip_vs_sync_buff
,
318 ms
->sync_queue_len
--;
319 if (!ms
->sync_queue_len
)
320 ms
->sync_queue_delay
= 0;
322 spin_unlock_bh(&ipvs
->sync_lock
);
328 * Create a new sync buffer for Version 1 proto.
330 static inline struct ip_vs_sync_buff
*
331 ip_vs_sync_buff_create(struct netns_ipvs
*ipvs
, unsigned int len
)
333 struct ip_vs_sync_buff
*sb
;
335 if (!(sb
=kmalloc(sizeof(struct ip_vs_sync_buff
), GFP_ATOMIC
)))
338 len
= max_t(unsigned int, len
+ sizeof(struct ip_vs_sync_mesg
),
339 ipvs
->mcfg
.sync_maxlen
);
340 sb
->mesg
= kmalloc(len
, GFP_ATOMIC
);
345 sb
->mesg
->reserved
= 0; /* old nr_conns i.e. must be zero now */
346 sb
->mesg
->version
= SYNC_PROTO_VER
;
347 sb
->mesg
->syncid
= ipvs
->mcfg
.syncid
;
348 sb
->mesg
->size
= htons(sizeof(struct ip_vs_sync_mesg
));
349 sb
->mesg
->nr_conns
= 0;
351 sb
->head
= (unsigned char *)sb
->mesg
+ sizeof(struct ip_vs_sync_mesg
);
352 sb
->end
= (unsigned char *)sb
->mesg
+ len
;
354 sb
->firstuse
= jiffies
;
358 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff
*sb
)
364 static inline void sb_queue_tail(struct netns_ipvs
*ipvs
,
365 struct ipvs_master_sync_state
*ms
)
367 struct ip_vs_sync_buff
*sb
= ms
->sync_buff
;
369 spin_lock(&ipvs
->sync_lock
);
370 if (ipvs
->sync_state
& IP_VS_STATE_MASTER
&&
371 ms
->sync_queue_len
< sysctl_sync_qlen_max(ipvs
)) {
372 if (!ms
->sync_queue_len
)
373 schedule_delayed_work(&ms
->master_wakeup_work
,
374 max(IPVS_SYNC_SEND_DELAY
, 1));
375 ms
->sync_queue_len
++;
376 list_add_tail(&sb
->list
, &ms
->sync_queue
);
377 if ((++ms
->sync_queue_delay
) == IPVS_SYNC_WAKEUP_RATE
)
378 wake_up_process(ms
->master_thread
);
380 ip_vs_sync_buff_release(sb
);
381 spin_unlock(&ipvs
->sync_lock
);
385 * Get the current sync buffer if it has been created for more
386 * than the specified time or the specified time is zero.
388 static inline struct ip_vs_sync_buff
*
389 get_curr_sync_buff(struct netns_ipvs
*ipvs
, struct ipvs_master_sync_state
*ms
,
392 struct ip_vs_sync_buff
*sb
;
394 spin_lock_bh(&ipvs
->sync_buff_lock
);
396 if (sb
&& time_after_eq(jiffies
- sb
->firstuse
, time
)) {
397 ms
->sync_buff
= NULL
;
398 __set_current_state(TASK_RUNNING
);
401 spin_unlock_bh(&ipvs
->sync_buff_lock
);
406 select_master_thread_id(struct netns_ipvs
*ipvs
, struct ip_vs_conn
*cp
)
408 return ((long) cp
>> (1 + ilog2(sizeof(*cp
)))) & ipvs
->threads_mask
;
412 * Create a new sync buffer for Version 0 proto.
414 static inline struct ip_vs_sync_buff
*
415 ip_vs_sync_buff_create_v0(struct netns_ipvs
*ipvs
, unsigned int len
)
417 struct ip_vs_sync_buff
*sb
;
418 struct ip_vs_sync_mesg_v0
*mesg
;
420 if (!(sb
=kmalloc(sizeof(struct ip_vs_sync_buff
), GFP_ATOMIC
)))
423 len
= max_t(unsigned int, len
+ sizeof(struct ip_vs_sync_mesg_v0
),
424 ipvs
->mcfg
.sync_maxlen
);
425 sb
->mesg
= kmalloc(len
, GFP_ATOMIC
);
430 mesg
= (struct ip_vs_sync_mesg_v0
*)sb
->mesg
;
432 mesg
->syncid
= ipvs
->mcfg
.syncid
;
433 mesg
->size
= htons(sizeof(struct ip_vs_sync_mesg_v0
));
434 sb
->head
= (unsigned char *)mesg
+ sizeof(struct ip_vs_sync_mesg_v0
);
435 sb
->end
= (unsigned char *)mesg
+ len
;
436 sb
->firstuse
= jiffies
;
440 /* Check if connection is controlled by persistence */
441 static inline bool in_persistence(struct ip_vs_conn
*cp
)
443 for (cp
= cp
->control
; cp
; cp
= cp
->control
) {
444 if (cp
->flags
& IP_VS_CONN_F_TEMPLATE
)
450 /* Check if conn should be synced.
451 * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
452 * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
453 * sync_retries times with period of sync_refresh_period/8
454 * - (2) if both sync_refresh_period and sync_period are 0 send sync only
455 * for state changes or only once when pkts matches sync_threshold
456 * - (3) templates: rate can be reduced only with sync_refresh_period or
459 static int ip_vs_sync_conn_needed(struct netns_ipvs
*ipvs
,
460 struct ip_vs_conn
*cp
, int pkts
)
462 unsigned long orig
= READ_ONCE(cp
->sync_endtime
);
463 unsigned long now
= jiffies
;
464 unsigned long n
= (now
+ cp
->timeout
) & ~3UL;
465 unsigned int sync_refresh_period
;
469 /* Check if we sync in current state */
470 if (unlikely(cp
->flags
& IP_VS_CONN_F_TEMPLATE
))
472 else if (unlikely(sysctl_sync_persist_mode(ipvs
) && in_persistence(cp
)))
474 else if (likely(cp
->protocol
== IPPROTO_TCP
)) {
475 if (!((1 << cp
->state
) &
476 ((1 << IP_VS_TCP_S_ESTABLISHED
) |
477 (1 << IP_VS_TCP_S_FIN_WAIT
) |
478 (1 << IP_VS_TCP_S_CLOSE
) |
479 (1 << IP_VS_TCP_S_CLOSE_WAIT
) |
480 (1 << IP_VS_TCP_S_TIME_WAIT
))))
482 force
= cp
->state
!= cp
->old_state
;
483 if (force
&& cp
->state
!= IP_VS_TCP_S_ESTABLISHED
)
485 } else if (unlikely(cp
->protocol
== IPPROTO_SCTP
)) {
486 if (!((1 << cp
->state
) &
487 ((1 << IP_VS_SCTP_S_ESTABLISHED
) |
488 (1 << IP_VS_SCTP_S_SHUTDOWN_SENT
) |
489 (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED
) |
490 (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT
) |
491 (1 << IP_VS_SCTP_S_CLOSED
))))
493 force
= cp
->state
!= cp
->old_state
;
494 if (force
&& cp
->state
!= IP_VS_SCTP_S_ESTABLISHED
)
497 /* UDP or another protocol with single state */
501 sync_refresh_period
= sysctl_sync_refresh_period(ipvs
);
502 if (sync_refresh_period
> 0) {
503 long diff
= n
- orig
;
504 long min_diff
= max(cp
->timeout
>> 1, 10UL * HZ
);
506 /* Avoid sync if difference is below sync_refresh_period
507 * and below the half timeout.
509 if (abs(diff
) < min_t(long, sync_refresh_period
, min_diff
)) {
510 int retries
= orig
& 3;
512 if (retries
>= sysctl_sync_retries(ipvs
))
514 if (time_before(now
, orig
- cp
->timeout
+
515 (sync_refresh_period
>> 3)))
520 sync_period
= sysctl_sync_period(ipvs
);
521 if (sync_period
> 0) {
522 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
) &&
523 pkts
% sync_period
!= sysctl_sync_threshold(ipvs
))
525 } else if (!sync_refresh_period
&&
526 pkts
!= sysctl_sync_threshold(ipvs
))
530 cp
->old_state
= cp
->state
;
531 n
= cmpxchg(&cp
->sync_endtime
, orig
, n
);
532 return n
== orig
|| force
;
536 * Version 0 , could be switched in by sys_ctl.
537 * Add an ip_vs_conn information into the current sync_buff.
539 static void ip_vs_sync_conn_v0(struct netns_ipvs
*ipvs
, struct ip_vs_conn
*cp
,
542 struct ip_vs_sync_mesg_v0
*m
;
543 struct ip_vs_sync_conn_v0
*s
;
544 struct ip_vs_sync_buff
*buff
;
545 struct ipvs_master_sync_state
*ms
;
549 if (unlikely(cp
->af
!= AF_INET
))
551 /* Do not sync ONE PACKET */
552 if (cp
->flags
& IP_VS_CONN_F_ONE_PACKET
)
555 if (!ip_vs_sync_conn_needed(ipvs
, cp
, pkts
))
558 spin_lock_bh(&ipvs
->sync_buff_lock
);
559 if (!(ipvs
->sync_state
& IP_VS_STATE_MASTER
)) {
560 spin_unlock_bh(&ipvs
->sync_buff_lock
);
564 id
= select_master_thread_id(ipvs
, cp
);
566 buff
= ms
->sync_buff
;
567 len
= (cp
->flags
& IP_VS_CONN_F_SEQ_MASK
) ? FULL_CONN_SIZE
:
570 m
= (struct ip_vs_sync_mesg_v0
*) buff
->mesg
;
571 /* Send buffer if it is for v1 */
572 if (buff
->head
+ len
> buff
->end
|| !m
->nr_conns
) {
573 sb_queue_tail(ipvs
, ms
);
574 ms
->sync_buff
= NULL
;
579 buff
= ip_vs_sync_buff_create_v0(ipvs
, len
);
581 spin_unlock_bh(&ipvs
->sync_buff_lock
);
582 pr_err("ip_vs_sync_buff_create failed.\n");
585 ms
->sync_buff
= buff
;
588 m
= (struct ip_vs_sync_mesg_v0
*) buff
->mesg
;
589 s
= (struct ip_vs_sync_conn_v0
*) buff
->head
;
593 s
->protocol
= cp
->protocol
;
594 s
->cport
= cp
->cport
;
595 s
->vport
= cp
->vport
;
596 s
->dport
= cp
->dport
;
597 s
->caddr
= cp
->caddr
.ip
;
598 s
->vaddr
= cp
->vaddr
.ip
;
599 s
->daddr
= cp
->daddr
.ip
;
600 s
->flags
= htons(cp
->flags
& ~IP_VS_CONN_F_HASHED
);
601 s
->state
= htons(cp
->state
);
602 if (cp
->flags
& IP_VS_CONN_F_SEQ_MASK
) {
603 struct ip_vs_sync_conn_options
*opt
=
604 (struct ip_vs_sync_conn_options
*)&s
[1];
605 memcpy(opt
, &cp
->in_seq
, sizeof(*opt
));
609 m
->size
= htons(ntohs(m
->size
) + len
);
611 spin_unlock_bh(&ipvs
->sync_buff_lock
);
613 /* synchronize its controller if it has */
616 if (cp
->flags
& IP_VS_CONN_F_TEMPLATE
)
617 pkts
= atomic_add_return(1, &cp
->in_pkts
);
619 pkts
= sysctl_sync_threshold(ipvs
);
620 ip_vs_sync_conn(ipvs
, cp
, pkts
);
625 * Add an ip_vs_conn information into the current sync_buff.
626 * Called by ip_vs_in.
627 * Sending Version 1 messages
629 void ip_vs_sync_conn(struct netns_ipvs
*ipvs
, struct ip_vs_conn
*cp
, int pkts
)
631 struct ip_vs_sync_mesg
*m
;
632 union ip_vs_sync_conn
*s
;
633 struct ip_vs_sync_buff
*buff
;
634 struct ipvs_master_sync_state
*ms
;
637 unsigned int len
, pe_name_len
, pad
;
639 /* Handle old version of the protocol */
640 if (sysctl_sync_ver(ipvs
) == 0) {
641 ip_vs_sync_conn_v0(ipvs
, cp
, pkts
);
644 /* Do not sync ONE PACKET */
645 if (cp
->flags
& IP_VS_CONN_F_ONE_PACKET
)
648 if (!ip_vs_sync_conn_needed(ipvs
, cp
, pkts
))
653 if (cp
->pe_data_len
) {
654 if (!cp
->pe_data
|| !cp
->dest
) {
655 IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
658 pe_name_len
= strnlen(cp
->pe
->name
, IP_VS_PENAME_MAXLEN
);
661 spin_lock_bh(&ipvs
->sync_buff_lock
);
662 if (!(ipvs
->sync_state
& IP_VS_STATE_MASTER
)) {
663 spin_unlock_bh(&ipvs
->sync_buff_lock
);
667 id
= select_master_thread_id(ipvs
, cp
);
670 #ifdef CONFIG_IP_VS_IPV6
671 if (cp
->af
== AF_INET6
)
672 len
= sizeof(struct ip_vs_sync_v6
);
675 len
= sizeof(struct ip_vs_sync_v4
);
677 if (cp
->flags
& IP_VS_CONN_F_SEQ_MASK
)
678 len
+= sizeof(struct ip_vs_sync_conn_options
) + 2;
681 len
+= cp
->pe_data_len
+ 2; /* + Param hdr field */
683 len
+= pe_name_len
+ 2;
685 /* check if there is a space for this one */
687 buff
= ms
->sync_buff
;
690 pad
= (4 - (size_t) buff
->head
) & 3;
691 /* Send buffer if it is for v0 */
692 if (buff
->head
+ len
+ pad
> buff
->end
|| m
->reserved
) {
693 sb_queue_tail(ipvs
, ms
);
694 ms
->sync_buff
= NULL
;
701 buff
= ip_vs_sync_buff_create(ipvs
, len
);
703 spin_unlock_bh(&ipvs
->sync_buff_lock
);
704 pr_err("ip_vs_sync_buff_create failed.\n");
707 ms
->sync_buff
= buff
;
712 buff
->head
+= pad
+ len
;
713 m
->size
= htons(ntohs(m
->size
) + pad
+ len
);
714 /* Add ev. padding from prev. sync_conn */
718 s
= (union ip_vs_sync_conn
*)p
;
720 /* Set message type & copy members */
721 s
->v4
.type
= (cp
->af
== AF_INET6
? STYPE_F_INET6
: 0);
722 s
->v4
.ver_size
= htons(len
& SVER_MASK
); /* Version 0 */
723 s
->v4
.flags
= htonl(cp
->flags
& ~IP_VS_CONN_F_HASHED
);
724 s
->v4
.state
= htons(cp
->state
);
725 s
->v4
.protocol
= cp
->protocol
;
726 s
->v4
.cport
= cp
->cport
;
727 s
->v4
.vport
= cp
->vport
;
728 s
->v4
.dport
= cp
->dport
;
729 s
->v4
.fwmark
= htonl(cp
->fwmark
);
730 s
->v4
.timeout
= htonl(cp
->timeout
/ HZ
);
733 #ifdef CONFIG_IP_VS_IPV6
734 if (cp
->af
== AF_INET6
) {
735 p
+= sizeof(struct ip_vs_sync_v6
);
736 s
->v6
.caddr
= cp
->caddr
.in6
;
737 s
->v6
.vaddr
= cp
->vaddr
.in6
;
738 s
->v6
.daddr
= cp
->daddr
.in6
;
742 p
+= sizeof(struct ip_vs_sync_v4
); /* options ptr */
743 s
->v4
.caddr
= cp
->caddr
.ip
;
744 s
->v4
.vaddr
= cp
->vaddr
.ip
;
745 s
->v4
.daddr
= cp
->daddr
.ip
;
747 if (cp
->flags
& IP_VS_CONN_F_SEQ_MASK
) {
748 *(p
++) = IPVS_OPT_SEQ_DATA
;
749 *(p
++) = sizeof(struct ip_vs_sync_conn_options
);
750 hton_seq((struct ip_vs_seq
*)p
, &cp
->in_seq
);
751 p
+= sizeof(struct ip_vs_seq
);
752 hton_seq((struct ip_vs_seq
*)p
, &cp
->out_seq
);
753 p
+= sizeof(struct ip_vs_seq
);
756 if (cp
->pe_data_len
&& cp
->pe_data
) {
757 *(p
++) = IPVS_OPT_PE_DATA
;
758 *(p
++) = cp
->pe_data_len
;
759 memcpy(p
, cp
->pe_data
, cp
->pe_data_len
);
760 p
+= cp
->pe_data_len
;
763 *(p
++) = IPVS_OPT_PE_NAME
;
764 *(p
++) = pe_name_len
;
765 memcpy(p
, cp
->pe
->name
, pe_name_len
);
770 spin_unlock_bh(&ipvs
->sync_buff_lock
);
773 /* synchronize its controller if it has */
777 if (cp
->flags
& IP_VS_CONN_F_TEMPLATE
)
778 pkts
= atomic_add_return(1, &cp
->in_pkts
);
780 pkts
= sysctl_sync_threshold(ipvs
);
785 * fill_param used by version 1
788 ip_vs_conn_fill_param_sync(struct netns_ipvs
*ipvs
, int af
, union ip_vs_sync_conn
*sc
,
789 struct ip_vs_conn_param
*p
,
790 __u8
*pe_data
, unsigned int pe_data_len
,
791 __u8
*pe_name
, unsigned int pe_name_len
)
793 #ifdef CONFIG_IP_VS_IPV6
795 ip_vs_conn_fill_param(ipvs
, af
, sc
->v6
.protocol
,
796 (const union nf_inet_addr
*)&sc
->v6
.caddr
,
798 (const union nf_inet_addr
*)&sc
->v6
.vaddr
,
802 ip_vs_conn_fill_param(ipvs
, af
, sc
->v4
.protocol
,
803 (const union nf_inet_addr
*)&sc
->v4
.caddr
,
805 (const union nf_inet_addr
*)&sc
->v4
.vaddr
,
810 char buff
[IP_VS_PENAME_MAXLEN
+1];
812 memcpy(buff
, pe_name
, pe_name_len
);
814 p
->pe
= __ip_vs_pe_getbyname(buff
);
816 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
821 IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
825 p
->pe_data
= kmemdup(pe_data
, pe_data_len
, GFP_ATOMIC
);
827 module_put(p
->pe
->module
);
830 p
->pe_data_len
= pe_data_len
;
836 * Connection Add / Update.
837 * Common for version 0 and 1 reception of backup sync_conns.
841 static void ip_vs_proc_conn(struct netns_ipvs
*ipvs
, struct ip_vs_conn_param
*param
,
842 unsigned int flags
, unsigned int state
,
843 unsigned int protocol
, unsigned int type
,
844 const union nf_inet_addr
*daddr
, __be16 dport
,
845 unsigned long timeout
, __u32 fwmark
,
846 struct ip_vs_sync_conn_options
*opt
)
848 struct ip_vs_dest
*dest
;
849 struct ip_vs_conn
*cp
;
851 if (!(flags
& IP_VS_CONN_F_TEMPLATE
)) {
852 cp
= ip_vs_conn_in_get(param
);
853 if (cp
&& ((cp
->dport
!= dport
) ||
854 !ip_vs_addr_equal(cp
->daf
, &cp
->daddr
, daddr
))) {
855 if (!(flags
& IP_VS_CONN_F_INACTIVE
)) {
856 ip_vs_conn_expire_now(cp
);
857 __ip_vs_conn_put(cp
);
860 /* This is the expiration message for the
861 * connection that was already replaced, so we
864 __ip_vs_conn_put(cp
);
865 kfree(param
->pe_data
);
870 cp
= ip_vs_ct_in_get(param
);
875 kfree(param
->pe_data
);
878 spin_lock_bh(&cp
->lock
);
879 if ((cp
->flags
^ flags
) & IP_VS_CONN_F_INACTIVE
&&
880 !(flags
& IP_VS_CONN_F_TEMPLATE
) && dest
) {
881 if (flags
& IP_VS_CONN_F_INACTIVE
) {
882 atomic_dec(&dest
->activeconns
);
883 atomic_inc(&dest
->inactconns
);
885 atomic_inc(&dest
->activeconns
);
886 atomic_dec(&dest
->inactconns
);
889 flags
&= IP_VS_CONN_F_BACKUP_UPD_MASK
;
890 flags
|= cp
->flags
& ~IP_VS_CONN_F_BACKUP_UPD_MASK
;
892 spin_unlock_bh(&cp
->lock
);
894 ip_vs_try_bind_dest(cp
);
897 * Find the appropriate destination for the connection.
898 * If it is not found the connection will remain unbound
902 /* This function is only invoked by the synchronization
903 * code. We do not currently support heterogeneous pools
904 * with synchronization, so we can make the assumption that
905 * the svc_af is the same as the dest_af
907 dest
= ip_vs_find_dest(ipvs
, type
, type
, daddr
, dport
,
908 param
->vaddr
, param
->vport
, protocol
,
911 cp
= ip_vs_conn_new(param
, type
, daddr
, dport
, flags
, dest
,
915 kfree(param
->pe_data
);
916 IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
919 if (!(flags
& IP_VS_CONN_F_TEMPLATE
))
920 kfree(param
->pe_data
);
924 cp
->in_seq
= opt
->in_seq
;
925 cp
->out_seq
= opt
->out_seq
;
927 atomic_set(&cp
->in_pkts
, sysctl_sync_threshold(ipvs
));
929 cp
->old_state
= cp
->state
;
931 * For Ver 0 messages style
932 * - Not possible to recover the right timeout for templates
933 * - can not find the right fwmark
934 * virtual service. If needed, we can do it for
935 * non-fwmark persistent services.
936 * Ver 1 messages style.
940 if (timeout
> MAX_SCHEDULE_TIMEOUT
/ HZ
)
941 timeout
= MAX_SCHEDULE_TIMEOUT
/ HZ
;
942 cp
->timeout
= timeout
*HZ
;
944 struct ip_vs_proto_data
*pd
;
946 pd
= ip_vs_proto_data_get(ipvs
, protocol
);
947 if (!(flags
& IP_VS_CONN_F_TEMPLATE
) && pd
&& pd
->timeout_table
)
948 cp
->timeout
= pd
->timeout_table
[state
];
950 cp
->timeout
= (3*60*HZ
);
956 * Process received multicast message for Version 0
958 static void ip_vs_process_message_v0(struct netns_ipvs
*ipvs
, const char *buffer
,
961 struct ip_vs_sync_mesg_v0
*m
= (struct ip_vs_sync_mesg_v0
*)buffer
;
962 struct ip_vs_sync_conn_v0
*s
;
963 struct ip_vs_sync_conn_options
*opt
;
964 struct ip_vs_protocol
*pp
;
965 struct ip_vs_conn_param param
;
969 p
= (char *)buffer
+ sizeof(struct ip_vs_sync_mesg_v0
);
970 for (i
=0; i
<m
->nr_conns
; i
++) {
971 unsigned int flags
, state
;
973 if (p
+ SIMPLE_CONN_SIZE
> buffer
+buflen
) {
974 IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
977 s
= (struct ip_vs_sync_conn_v0
*) p
;
978 flags
= ntohs(s
->flags
) | IP_VS_CONN_F_SYNC
;
979 flags
&= ~IP_VS_CONN_F_HASHED
;
980 if (flags
& IP_VS_CONN_F_SEQ_MASK
) {
981 opt
= (struct ip_vs_sync_conn_options
*)&s
[1];
983 if (p
> buffer
+buflen
) {
984 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
989 p
+= SIMPLE_CONN_SIZE
;
992 state
= ntohs(s
->state
);
993 if (!(flags
& IP_VS_CONN_F_TEMPLATE
)) {
994 pp
= ip_vs_proto_get(s
->protocol
);
996 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
1000 if (state
>= pp
->num_states
) {
1001 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
1006 if (state
>= IP_VS_CTPL_S_LAST
)
1007 IP_VS_DBG(7, "BACKUP v0, Invalid tpl state %u\n",
1011 ip_vs_conn_fill_param(ipvs
, AF_INET
, s
->protocol
,
1012 (const union nf_inet_addr
*)&s
->caddr
,
1014 (const union nf_inet_addr
*)&s
->vaddr
,
1017 /* Send timeout as Zero */
1018 ip_vs_proc_conn(ipvs
, ¶m
, flags
, state
, s
->protocol
, AF_INET
,
1019 (union nf_inet_addr
*)&s
->daddr
, s
->dport
,
1027 static inline int ip_vs_proc_seqopt(__u8
*p
, unsigned int plen
,
1029 struct ip_vs_sync_conn_options
*opt
)
1031 struct ip_vs_sync_conn_options
*topt
;
1033 topt
= (struct ip_vs_sync_conn_options
*)p
;
1035 if (plen
!= sizeof(struct ip_vs_sync_conn_options
)) {
1036 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1039 if (*opt_flags
& IPVS_OPT_F_SEQ_DATA
) {
1040 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1043 ntoh_seq(&topt
->in_seq
, &opt
->in_seq
);
1044 ntoh_seq(&topt
->out_seq
, &opt
->out_seq
);
1045 *opt_flags
|= IPVS_OPT_F_SEQ_DATA
;
1049 static int ip_vs_proc_str(__u8
*p
, unsigned int plen
, unsigned int *data_len
,
1050 __u8
**data
, unsigned int maxlen
,
1051 __u32
*opt_flags
, __u32 flag
)
1053 if (plen
> maxlen
) {
1054 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen
);
1057 if (*opt_flags
& flag
) {
1058 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag
);
1067 * Process a Version 1 sync. connection
1069 static inline int ip_vs_proc_sync_conn(struct netns_ipvs
*ipvs
, __u8
*p
, __u8
*msg_end
)
1071 struct ip_vs_sync_conn_options opt
;
1072 union ip_vs_sync_conn
*s
;
1073 struct ip_vs_protocol
*pp
;
1074 struct ip_vs_conn_param param
;
1076 unsigned int af
, state
, pe_data_len
=0, pe_name_len
=0;
1077 __u8
*pe_data
=NULL
, *pe_name
=NULL
;
1081 s
= (union ip_vs_sync_conn
*) p
;
1083 if (s
->v6
.type
& STYPE_F_INET6
) {
1084 #ifdef CONFIG_IP_VS_IPV6
1086 p
+= sizeof(struct ip_vs_sync_v6
);
1088 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1092 } else if (!s
->v4
.type
) {
1094 p
+= sizeof(struct ip_vs_sync_v4
);
1101 /* Process optional params check Type & Len. */
1102 while (p
< msg_end
) {
1111 if (!plen
|| ((p
+ plen
) > msg_end
))
1113 /* Handle seq option p = param data */
1114 switch (ptype
& ~IPVS_OPT_F_PARAM
) {
1115 case IPVS_OPT_SEQ_DATA
:
1116 if (ip_vs_proc_seqopt(p
, plen
, &opt_flags
, &opt
))
1120 case IPVS_OPT_PE_DATA
:
1121 if (ip_vs_proc_str(p
, plen
, &pe_data_len
, &pe_data
,
1122 IP_VS_PEDATA_MAXLEN
, &opt_flags
,
1123 IPVS_OPT_F_PE_DATA
))
1127 case IPVS_OPT_PE_NAME
:
1128 if (ip_vs_proc_str(p
, plen
,&pe_name_len
, &pe_name
,
1129 IP_VS_PENAME_MAXLEN
, &opt_flags
,
1130 IPVS_OPT_F_PE_NAME
))
1135 /* Param data mandatory ? */
1136 if (!(ptype
& IPVS_OPT_F_PARAM
)) {
1137 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1138 ptype
& ~IPVS_OPT_F_PARAM
);
1143 p
+= plen
; /* Next option */
1146 /* Get flags and Mask off unsupported */
1147 flags
= ntohl(s
->v4
.flags
) & IP_VS_CONN_F_BACKUP_MASK
;
1148 flags
|= IP_VS_CONN_F_SYNC
;
1149 state
= ntohs(s
->v4
.state
);
1151 if (!(flags
& IP_VS_CONN_F_TEMPLATE
)) {
1152 pp
= ip_vs_proto_get(s
->v4
.protocol
);
1154 IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1159 if (state
>= pp
->num_states
) {
1160 IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1166 if (state
>= IP_VS_CTPL_S_LAST
)
1167 IP_VS_DBG(7, "BACKUP, Invalid tpl state %u\n",
1170 if (ip_vs_conn_fill_param_sync(ipvs
, af
, s
, ¶m
, pe_data
,
1171 pe_data_len
, pe_name
, pe_name_len
)) {
1175 /* If only IPv4, just silent skip IPv6 */
1177 ip_vs_proc_conn(ipvs
, ¶m
, flags
, state
, s
->v4
.protocol
, af
,
1178 (union nf_inet_addr
*)&s
->v4
.daddr
, s
->v4
.dport
,
1179 ntohl(s
->v4
.timeout
), ntohl(s
->v4
.fwmark
),
1180 (opt_flags
& IPVS_OPT_F_SEQ_DATA
? &opt
: NULL
)
1182 #ifdef CONFIG_IP_VS_IPV6
1184 ip_vs_proc_conn(ipvs
, ¶m
, flags
, state
, s
->v6
.protocol
, af
,
1185 (union nf_inet_addr
*)&s
->v6
.daddr
, s
->v6
.dport
,
1186 ntohl(s
->v6
.timeout
), ntohl(s
->v6
.fwmark
),
1187 (opt_flags
& IPVS_OPT_F_SEQ_DATA
? &opt
: NULL
)
1190 ip_vs_pe_put(param
.pe
);
1194 IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc
);
1199 * Process received multicast message and create the corresponding
1200 * ip_vs_conn entries.
1201 * Handles Version 0 & 1
1203 static void ip_vs_process_message(struct netns_ipvs
*ipvs
, __u8
*buffer
,
1204 const size_t buflen
)
1206 struct ip_vs_sync_mesg
*m2
= (struct ip_vs_sync_mesg
*)buffer
;
1210 if (buflen
< sizeof(struct ip_vs_sync_mesg_v0
)) {
1211 IP_VS_DBG(2, "BACKUP, message header too short\n");
1215 if (buflen
!= ntohs(m2
->size
)) {
1216 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1219 /* SyncID sanity check */
1220 if (ipvs
->bcfg
.syncid
!= 0 && m2
->syncid
!= ipvs
->bcfg
.syncid
) {
1221 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2
->syncid
);
1224 /* Handle version 1 message */
1225 if ((m2
->version
== SYNC_PROTO_VER
) && (m2
->reserved
== 0)
1226 && (m2
->spare
== 0)) {
1228 msg_end
= buffer
+ sizeof(struct ip_vs_sync_mesg
);
1229 nr_conns
= m2
->nr_conns
;
1231 for (i
=0; i
<nr_conns
; i
++) {
1232 union ip_vs_sync_conn
*s
;
1237 if (p
+ sizeof(s
->v4
) > buffer
+buflen
) {
1238 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n");
1241 s
= (union ip_vs_sync_conn
*)p
;
1242 size
= ntohs(s
->v4
.ver_size
) & SVER_MASK
;
1244 /* Basic sanity checks */
1245 if (msg_end
> buffer
+buflen
) {
1246 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1249 if (ntohs(s
->v4
.ver_size
) >> SVER_SHIFT
) {
1250 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1251 ntohs(s
->v4
.ver_size
) >> SVER_SHIFT
);
1254 /* Process a single sync_conn */
1255 retc
= ip_vs_proc_sync_conn(ipvs
, p
, msg_end
);
1257 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1261 /* Make sure we have 32 bit alignment */
1262 msg_end
= p
+ ((size
+ 3) & ~3);
1265 /* Old type of message */
1266 ip_vs_process_message_v0(ipvs
, buffer
, buflen
);
1273 * Setup sndbuf (mode=1) or rcvbuf (mode=0)
1275 static void set_sock_size(struct sock
*sk
, int mode
, int val
)
1277 /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1278 /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1281 val
= clamp_t(int, val
, (SOCK_MIN_SNDBUF
+ 1) / 2,
1283 sk
->sk_sndbuf
= val
* 2;
1284 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1286 val
= clamp_t(int, val
, (SOCK_MIN_RCVBUF
+ 1) / 2,
1288 sk
->sk_rcvbuf
= val
* 2;
1289 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1295 * Setup loopback of outgoing multicasts on a sending socket
1297 static void set_mcast_loop(struct sock
*sk
, u_char loop
)
1299 struct inet_sock
*inet
= inet_sk(sk
);
1301 /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1303 inet
->mc_loop
= loop
? 1 : 0;
1304 #ifdef CONFIG_IP_VS_IPV6
1305 if (sk
->sk_family
== AF_INET6
) {
1306 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1308 /* IPV6_MULTICAST_LOOP */
1309 np
->mc_loop
= loop
? 1 : 0;
1316 * Specify TTL for outgoing multicasts on a sending socket
1318 static void set_mcast_ttl(struct sock
*sk
, u_char ttl
)
1320 struct inet_sock
*inet
= inet_sk(sk
);
1322 /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1325 #ifdef CONFIG_IP_VS_IPV6
1326 if (sk
->sk_family
== AF_INET6
) {
1327 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1329 /* IPV6_MULTICAST_HOPS */
1330 np
->mcast_hops
= ttl
;
1336 /* Control fragmentation of messages */
1337 static void set_mcast_pmtudisc(struct sock
*sk
, int val
)
1339 struct inet_sock
*inet
= inet_sk(sk
);
1341 /* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
1343 inet
->pmtudisc
= val
;
1344 #ifdef CONFIG_IP_VS_IPV6
1345 if (sk
->sk_family
== AF_INET6
) {
1346 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1348 /* IPV6_MTU_DISCOVER */
1356 * Specifiy default interface for outgoing multicasts
1358 static int set_mcast_if(struct sock
*sk
, struct net_device
*dev
)
1360 struct inet_sock
*inet
= inet_sk(sk
);
1362 if (sk
->sk_bound_dev_if
&& dev
->ifindex
!= sk
->sk_bound_dev_if
)
1366 inet
->mc_index
= dev
->ifindex
;
1367 /* inet->mc_addr = 0; */
1368 #ifdef CONFIG_IP_VS_IPV6
1369 if (sk
->sk_family
== AF_INET6
) {
1370 struct ipv6_pinfo
*np
= inet6_sk(sk
);
1372 /* IPV6_MULTICAST_IF */
1373 np
->mcast_oif
= dev
->ifindex
;
1383 * Join a multicast group.
1384 * the group is specified by a class D multicast address 224.0.0.0/8
1385 * in the in_addr structure passed in as a parameter.
1388 join_mcast_group(struct sock
*sk
, struct in_addr
*addr
, struct net_device
*dev
)
1390 struct ip_mreqn mreq
;
1393 memset(&mreq
, 0, sizeof(mreq
));
1394 memcpy(&mreq
.imr_multiaddr
, addr
, sizeof(struct in_addr
));
1396 if (sk
->sk_bound_dev_if
&& dev
->ifindex
!= sk
->sk_bound_dev_if
)
1399 mreq
.imr_ifindex
= dev
->ifindex
;
1402 ret
= ip_mc_join_group(sk
, &mreq
);
1408 #ifdef CONFIG_IP_VS_IPV6
1409 static int join_mcast_group6(struct sock
*sk
, struct in6_addr
*addr
,
1410 struct net_device
*dev
)
1414 if (sk
->sk_bound_dev_if
&& dev
->ifindex
!= sk
->sk_bound_dev_if
)
1418 ret
= ipv6_sock_mc_join(sk
, dev
->ifindex
, addr
);
1425 static int bind_mcastif_addr(struct socket
*sock
, struct net_device
*dev
)
1428 struct sockaddr_in sin
;
1430 addr
= inet_select_addr(dev
, 0, RT_SCOPE_UNIVERSE
);
1432 pr_err("You probably need to specify IP address on "
1433 "multicast interface.\n");
1435 IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1438 /* Now bind the socket with the address of multicast interface */
1439 sin
.sin_family
= AF_INET
;
1440 sin
.sin_addr
.s_addr
= addr
;
1443 return sock
->ops
->bind(sock
, (struct sockaddr
*)&sin
, sizeof(sin
));
1446 static void get_mcast_sockaddr(union ipvs_sockaddr
*sa
, int *salen
,
1447 struct ipvs_sync_daemon_cfg
*c
, int id
)
1449 if (AF_INET6
== c
->mcast_af
) {
1450 sa
->in6
= (struct sockaddr_in6
) {
1451 .sin6_family
= AF_INET6
,
1452 .sin6_port
= htons(c
->mcast_port
+ id
),
1454 sa
->in6
.sin6_addr
= c
->mcast_group
.in6
;
1455 *salen
= sizeof(sa
->in6
);
1457 sa
->in
= (struct sockaddr_in
) {
1458 .sin_family
= AF_INET
,
1459 .sin_port
= htons(c
->mcast_port
+ id
),
1461 sa
->in
.sin_addr
= c
->mcast_group
.in
;
1462 *salen
= sizeof(sa
->in
);
1467 * Set up sending multicast socket over UDP
1469 static int make_send_sock(struct netns_ipvs
*ipvs
, int id
,
1470 struct net_device
*dev
, struct socket
**sock_ret
)
1472 /* multicast addr */
1473 union ipvs_sockaddr mcast_addr
;
1474 struct socket
*sock
;
1477 /* First create a socket */
1478 result
= sock_create_kern(ipvs
->net
, ipvs
->mcfg
.mcast_af
, SOCK_DGRAM
,
1479 IPPROTO_UDP
, &sock
);
1481 pr_err("Error during creation of socket; terminating\n");
1485 result
= set_mcast_if(sock
->sk
, dev
);
1487 pr_err("Error setting outbound mcast interface\n");
1491 set_mcast_loop(sock
->sk
, 0);
1492 set_mcast_ttl(sock
->sk
, ipvs
->mcfg
.mcast_ttl
);
1493 /* Allow fragmentation if MTU changes */
1494 set_mcast_pmtudisc(sock
->sk
, IP_PMTUDISC_DONT
);
1495 result
= sysctl_sync_sock_size(ipvs
);
1497 set_sock_size(sock
->sk
, 1, result
);
1499 if (AF_INET
== ipvs
->mcfg
.mcast_af
)
1500 result
= bind_mcastif_addr(sock
, dev
);
1504 pr_err("Error binding address of the mcast interface\n");
1508 get_mcast_sockaddr(&mcast_addr
, &salen
, &ipvs
->mcfg
, id
);
1509 result
= sock
->ops
->connect(sock
, (struct sockaddr
*) &mcast_addr
,
1512 pr_err("Error connecting to the multicast addr\n");
1524 * Set up receiving multicast socket over UDP
1526 static int make_receive_sock(struct netns_ipvs
*ipvs
, int id
,
1527 struct net_device
*dev
, struct socket
**sock_ret
)
1529 /* multicast addr */
1530 union ipvs_sockaddr mcast_addr
;
1531 struct socket
*sock
;
1534 /* First create a socket */
1535 result
= sock_create_kern(ipvs
->net
, ipvs
->bcfg
.mcast_af
, SOCK_DGRAM
,
1536 IPPROTO_UDP
, &sock
);
1538 pr_err("Error during creation of socket; terminating\n");
1542 /* it is equivalent to the REUSEADDR option in user-space */
1543 sock
->sk
->sk_reuse
= SK_CAN_REUSE
;
1544 result
= sysctl_sync_sock_size(ipvs
);
1546 set_sock_size(sock
->sk
, 0, result
);
1548 get_mcast_sockaddr(&mcast_addr
, &salen
, &ipvs
->bcfg
, id
);
1549 sock
->sk
->sk_bound_dev_if
= dev
->ifindex
;
1550 result
= sock
->ops
->bind(sock
, (struct sockaddr
*)&mcast_addr
, salen
);
1552 pr_err("Error binding to the multicast addr\n");
1556 /* join the multicast group */
1557 #ifdef CONFIG_IP_VS_IPV6
1558 if (ipvs
->bcfg
.mcast_af
== AF_INET6
)
1559 result
= join_mcast_group6(sock
->sk
, &mcast_addr
.in6
.sin6_addr
,
1563 result
= join_mcast_group(sock
->sk
, &mcast_addr
.in
.sin_addr
,
1566 pr_err("Error joining to the multicast group\n");
1578 ip_vs_send_async(struct socket
*sock
, const char *buffer
, const size_t length
)
1580 struct msghdr msg
= {.msg_flags
= MSG_DONTWAIT
|MSG_NOSIGNAL
};
1585 iov
.iov_base
= (void *)buffer
;
1586 iov
.iov_len
= length
;
1588 len
= kernel_sendmsg(sock
, &msg
, &iov
, 1, (size_t)(length
));
1595 ip_vs_send_sync_msg(struct socket
*sock
, struct ip_vs_sync_mesg
*msg
)
1600 msize
= ntohs(msg
->size
);
1602 ret
= ip_vs_send_async(sock
, (char *)msg
, msize
);
1603 if (ret
>= 0 || ret
== -EAGAIN
)
1605 pr_err("ip_vs_send_async error %d\n", ret
);
1610 ip_vs_receive(struct socket
*sock
, char *buffer
, const size_t buflen
)
1612 struct msghdr msg
= {NULL
,};
1613 struct kvec iov
= {buffer
, buflen
};
1618 /* Receive a packet */
1619 iov_iter_kvec(&msg
.msg_iter
, READ
, &iov
, 1, buflen
);
1620 len
= sock_recvmsg(sock
, &msg
, MSG_DONTWAIT
);
1628 /* Wakeup the master thread for sending */
1629 static void master_wakeup_work_handler(struct work_struct
*work
)
1631 struct ipvs_master_sync_state
*ms
=
1632 container_of(work
, struct ipvs_master_sync_state
,
1633 master_wakeup_work
.work
);
1634 struct netns_ipvs
*ipvs
= ms
->ipvs
;
1636 spin_lock_bh(&ipvs
->sync_lock
);
1637 if (ms
->sync_queue_len
&&
1638 ms
->sync_queue_delay
< IPVS_SYNC_WAKEUP_RATE
) {
1639 ms
->sync_queue_delay
= IPVS_SYNC_WAKEUP_RATE
;
1640 wake_up_process(ms
->master_thread
);
1642 spin_unlock_bh(&ipvs
->sync_lock
);
1645 /* Get next buffer to send */
1646 static inline struct ip_vs_sync_buff
*
1647 next_sync_buff(struct netns_ipvs
*ipvs
, struct ipvs_master_sync_state
*ms
)
1649 struct ip_vs_sync_buff
*sb
;
1651 sb
= sb_dequeue(ipvs
, ms
);
1654 /* Do not delay entries in buffer for more than 2 seconds */
1655 return get_curr_sync_buff(ipvs
, ms
, IPVS_SYNC_FLUSH_TIME
);
1658 static int sync_thread_master(void *data
)
1660 struct ip_vs_sync_thread_data
*tinfo
= data
;
1661 struct netns_ipvs
*ipvs
= tinfo
->ipvs
;
1662 struct ipvs_master_sync_state
*ms
= &ipvs
->ms
[tinfo
->id
];
1663 struct sock
*sk
= tinfo
->sock
->sk
;
1664 struct ip_vs_sync_buff
*sb
;
1666 pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1667 "syncid = %d, id = %d\n",
1668 ipvs
->mcfg
.mcast_ifn
, ipvs
->mcfg
.syncid
, tinfo
->id
);
1671 sb
= next_sync_buff(ipvs
, ms
);
1672 if (unlikely(kthread_should_stop()))
1675 schedule_timeout(IPVS_SYNC_CHECK_PERIOD
);
1678 while (ip_vs_send_sync_msg(tinfo
->sock
, sb
->mesg
) < 0) {
1679 /* (Ab)use interruptible sleep to avoid increasing
1682 __wait_event_interruptible(*sk_sleep(sk
),
1683 sock_writeable(sk
) ||
1684 kthread_should_stop());
1685 if (unlikely(kthread_should_stop()))
1688 ip_vs_sync_buff_release(sb
);
1692 __set_current_state(TASK_RUNNING
);
1694 ip_vs_sync_buff_release(sb
);
1696 /* clean up the sync_buff queue */
1697 while ((sb
= sb_dequeue(ipvs
, ms
)))
1698 ip_vs_sync_buff_release(sb
);
1699 __set_current_state(TASK_RUNNING
);
1701 /* clean up the current sync_buff */
1702 sb
= get_curr_sync_buff(ipvs
, ms
, 0);
1704 ip_vs_sync_buff_release(sb
);
1706 /* release the sending multicast socket */
1707 sock_release(tinfo
->sock
);
1714 static int sync_thread_backup(void *data
)
1716 struct ip_vs_sync_thread_data
*tinfo
= data
;
1717 struct netns_ipvs
*ipvs
= tinfo
->ipvs
;
1720 pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1721 "syncid = %d, id = %d\n",
1722 ipvs
->bcfg
.mcast_ifn
, ipvs
->bcfg
.syncid
, tinfo
->id
);
1724 while (!kthread_should_stop()) {
1725 wait_event_interruptible(*sk_sleep(tinfo
->sock
->sk
),
1726 !skb_queue_empty(&tinfo
->sock
->sk
->sk_receive_queue
)
1727 || kthread_should_stop());
1729 /* do we have data now? */
1730 while (!skb_queue_empty(&(tinfo
->sock
->sk
->sk_receive_queue
))) {
1731 len
= ip_vs_receive(tinfo
->sock
, tinfo
->buf
,
1732 ipvs
->bcfg
.sync_maxlen
);
1735 pr_err("receiving message error\n");
1739 ip_vs_process_message(ipvs
, tinfo
->buf
, len
);
1743 /* release the sending multicast socket */
1744 sock_release(tinfo
->sock
);
1752 int start_sync_thread(struct netns_ipvs
*ipvs
, struct ipvs_sync_daemon_cfg
*c
,
1755 struct ip_vs_sync_thread_data
*tinfo
= NULL
;
1756 struct task_struct
**array
= NULL
, *task
;
1757 struct net_device
*dev
;
1759 int (*threadfn
)(void *data
);
1760 int id
= 0, count
, hlen
;
1761 int result
= -ENOMEM
;
1764 IP_VS_DBG(7, "%s(): pid %d\n", __func__
, task_pid_nr(current
));
1765 IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %zd bytes\n",
1766 sizeof(struct ip_vs_sync_conn_v0
));
1768 /* Do not hold one mutex and then to block on another */
1771 if (mutex_trylock(&ipvs
->sync_mutex
))
1774 mutex_lock(&ipvs
->sync_mutex
);
1777 mutex_unlock(&ipvs
->sync_mutex
);
1780 if (!ipvs
->sync_state
) {
1781 count
= clamp(sysctl_sync_ports(ipvs
), 1, IPVS_SYNC_PORTS_MAX
);
1782 ipvs
->threads_mask
= count
- 1;
1784 count
= ipvs
->threads_mask
+ 1;
1786 if (c
->mcast_af
== AF_UNSPEC
) {
1787 c
->mcast_af
= AF_INET
;
1788 c
->mcast_group
.ip
= cpu_to_be32(IP_VS_SYNC_GROUP
);
1791 c
->mcast_port
= IP_VS_SYNC_PORT
;
1795 dev
= __dev_get_by_name(ipvs
->net
, c
->mcast_ifn
);
1797 pr_err("Unknown mcast interface: %s\n", c
->mcast_ifn
);
1801 hlen
= (AF_INET6
== c
->mcast_af
) ?
1802 sizeof(struct ipv6hdr
) + sizeof(struct udphdr
) :
1803 sizeof(struct iphdr
) + sizeof(struct udphdr
);
1804 mtu
= (state
== IP_VS_STATE_BACKUP
) ?
1805 clamp(dev
->mtu
, 1500U, 65535U) : 1500U;
1806 min_mtu
= (state
== IP_VS_STATE_BACKUP
) ? 1024 : 1;
1809 c
->sync_maxlen
= clamp_t(unsigned int,
1810 c
->sync_maxlen
, min_mtu
,
1813 c
->sync_maxlen
= mtu
- hlen
;
1815 if (state
== IP_VS_STATE_MASTER
) {
1821 name
= "ipvs-m:%d:%d";
1822 threadfn
= sync_thread_master
;
1823 } else if (state
== IP_VS_STATE_BACKUP
) {
1825 if (ipvs
->backup_threads
)
1829 name
= "ipvs-b:%d:%d";
1830 threadfn
= sync_thread_backup
;
1836 if (state
== IP_VS_STATE_MASTER
) {
1837 struct ipvs_master_sync_state
*ms
;
1840 ipvs
->ms
= kcalloc(count
, sizeof(ipvs
->ms
[0]), GFP_KERNEL
);
1844 for (id
= 0; id
< count
; id
++, ms
++) {
1845 INIT_LIST_HEAD(&ms
->sync_queue
);
1846 ms
->sync_queue_len
= 0;
1847 ms
->sync_queue_delay
= 0;
1848 INIT_DELAYED_WORK(&ms
->master_wakeup_work
,
1849 master_wakeup_work_handler
);
1853 array
= kcalloc(count
, sizeof(struct task_struct
*),
1860 for (id
= 0; id
< count
; id
++) {
1862 tinfo
= kmalloc(sizeof(*tinfo
), GFP_KERNEL
);
1867 if (state
== IP_VS_STATE_BACKUP
) {
1868 tinfo
->buf
= kmalloc(ipvs
->bcfg
.sync_maxlen
,
1876 if (state
== IP_VS_STATE_MASTER
)
1877 result
= make_send_sock(ipvs
, id
, dev
, &tinfo
->sock
);
1879 result
= make_receive_sock(ipvs
, id
, dev
, &tinfo
->sock
);
1883 task
= kthread_run(threadfn
, tinfo
, name
, ipvs
->gen
, id
);
1885 result
= PTR_ERR(task
);
1889 if (state
== IP_VS_STATE_MASTER
)
1890 ipvs
->ms
[id
].master_thread
= task
;
1895 /* mark as active */
1897 if (state
== IP_VS_STATE_BACKUP
)
1898 ipvs
->backup_threads
= array
;
1899 spin_lock_bh(&ipvs
->sync_buff_lock
);
1900 ipvs
->sync_state
|= state
;
1901 spin_unlock_bh(&ipvs
->sync_buff_lock
);
1903 mutex_unlock(&ipvs
->sync_mutex
);
1906 /* increase the module use count */
1907 ip_vs_use_count_inc();
1912 /* We do not need RTNL lock anymore, release it here so that
1913 * sock_release below and in the kthreads can use rtnl_lock
1914 * to leave the mcast group.
1918 while (count
-- > 0) {
1919 if (state
== IP_VS_STATE_MASTER
)
1920 kthread_stop(ipvs
->ms
[count
].master_thread
);
1922 kthread_stop(array
[count
]);
1924 if (!(ipvs
->sync_state
& IP_VS_STATE_MASTER
)) {
1928 mutex_unlock(&ipvs
->sync_mutex
);
1931 sock_release(tinfo
->sock
);
1939 mutex_unlock(&ipvs
->sync_mutex
);
1945 int stop_sync_thread(struct netns_ipvs
*ipvs
, int state
)
1947 struct task_struct
**array
;
1951 IP_VS_DBG(7, "%s(): pid %d\n", __func__
, task_pid_nr(current
));
1953 if (state
== IP_VS_STATE_MASTER
) {
1958 * The lock synchronizes with sb_queue_tail(), so that we don't
1959 * add sync buffers to the queue, when we are already in
1960 * progress of stopping the master sync daemon.
1963 spin_lock_bh(&ipvs
->sync_buff_lock
);
1964 spin_lock(&ipvs
->sync_lock
);
1965 ipvs
->sync_state
&= ~IP_VS_STATE_MASTER
;
1966 spin_unlock(&ipvs
->sync_lock
);
1967 spin_unlock_bh(&ipvs
->sync_buff_lock
);
1970 for (id
= ipvs
->threads_mask
; id
>= 0; id
--) {
1971 struct ipvs_master_sync_state
*ms
= &ipvs
->ms
[id
];
1974 pr_info("stopping master sync thread %d ...\n",
1975 task_pid_nr(ms
->master_thread
));
1976 cancel_delayed_work_sync(&ms
->master_wakeup_work
);
1977 ret
= kthread_stop(ms
->master_thread
);
1983 } else if (state
== IP_VS_STATE_BACKUP
) {
1984 if (!ipvs
->backup_threads
)
1987 ipvs
->sync_state
&= ~IP_VS_STATE_BACKUP
;
1988 array
= ipvs
->backup_threads
;
1990 for (id
= ipvs
->threads_mask
; id
>= 0; id
--) {
1993 pr_info("stopping backup sync thread %d ...\n",
1994 task_pid_nr(array
[id
]));
1995 ret
= kthread_stop(array
[id
]);
2000 ipvs
->backup_threads
= NULL
;
2003 /* decrease the module use count */
2004 ip_vs_use_count_dec();
2010 * Initialize data struct for each netns
2012 int __net_init
ip_vs_sync_net_init(struct netns_ipvs
*ipvs
)
2014 __mutex_init(&ipvs
->sync_mutex
, "ipvs->sync_mutex", &__ipvs_sync_key
);
2015 spin_lock_init(&ipvs
->sync_lock
);
2016 spin_lock_init(&ipvs
->sync_buff_lock
);
2020 void ip_vs_sync_net_cleanup(struct netns_ipvs
*ipvs
)
2024 mutex_lock(&ipvs
->sync_mutex
);
2025 retc
= stop_sync_thread(ipvs
, IP_VS_STATE_MASTER
);
2026 if (retc
&& retc
!= -ESRCH
)
2027 pr_err("Failed to stop Master Daemon\n");
2029 retc
= stop_sync_thread(ipvs
, IP_VS_STATE_BACKUP
);
2030 if (retc
&& retc
!= -ESRCH
)
2031 pr_err("Failed to stop Backup Daemon\n");
2032 mutex_unlock(&ipvs
->sync_mutex
);