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
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
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.
20 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
22 * ip_vs_sync: sync connection info from master load balancer to backups
26 * Alexandre Cassen : Added master & backup support at a time.
27 * Alexandre Cassen : Added SyncID support for incoming sync
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.
34 #define KMSG_COMPONENT "IPVS"
35 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
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>
52 #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */
57 #include <net/ip_vs.h>
59 #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */
60 #define IP_VS_SYNC_PORT 8848 /* multicast port */
62 #define SYNC_PROTO_VER 1 /* Protocol version in header */
64 static struct lock_class_key __ipvs_sync_key;
66 * IPVS sync connection entry
67 * Version 0, i.e. original version.
69 struct ip_vs_sync_conn_v0 {
72 /* Protocol, addresses and port numbers */
73 __u8 protocol; /* Which protocol (TCP/UDP) */
77 __be32 caddr; /* client address */
78 __be32 vaddr; /* virtual address */
79 __be32 daddr; /* destination address */
81 /* Flags and state transition */
82 __be16 flags; /* status flags */
83 __be16 state; /* state info */
85 /* The sequence options start here */
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 */
94 Sync Connection format (sync_conn)
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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
102 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
104 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
106 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
109 | timeout (in sec.) |
110 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
112 | IP-Addresses (v4 or v6) |
114 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
116 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
117 | Param. Type | Param. Length | Param. data |
118 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
120 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 | | Param Type | Param. Length |
122 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
124 | Last Param data should be padded for 32 bit alignment |
125 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
129 * Type 0, IPv4 sync connection format
131 struct ip_vs_sync_v4 {
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 */
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 */
151 * Type 2 messages IPv6
153 struct ip_vs_sync_v6 {
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 */
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 */
173 union ip_vs_sync_conn {
174 struct ip_vs_sync_v4 v4;
175 struct ip_vs_sync_v6 v6;
178 /* Bits in Type field in above */
179 #define STYPE_INET6 0
180 #define STYPE_F_INET6 (1 << STYPE_INET6)
182 #define SVER_SHIFT 12 /* Shift to get version */
183 #define SVER_MASK 0x0fff /* Mask to strip version */
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
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))
195 struct ip_vs_sync_thread_data {
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))
209 The master mulitcasts messages (Datagrams) to the backup load balancers
210 in the following format.
213 Note, first byte should be Zero, so ver 0 receivers will drop the packet.
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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
223 | IPVS Sync Connection (1) |
224 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
228 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
230 | IPVS Sync Connection (n) |
231 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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) |
242 #define SYNC_MESG_HEADER_LEN 4
243 #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */
245 /* Version 0 header */
246 struct ip_vs_sync_mesg_v0 {
251 /* ip_vs_sync_conn entries start here */
254 /* Version 1 header */
255 struct ip_vs_sync_mesg {
256 __u8 reserved; /* must be zero */
260 __s8 version; /* SYNC_PROTO_VER */
262 /* ip_vs_sync_conn entries start here */
265 struct ip_vs_sync_buff {
266 struct list_head list;
267 unsigned long firstuse;
269 /* pointers for the message data */
270 struct ip_vs_sync_mesg *mesg;
276 * Copy of struct ip_vs_seq
277 * From unaligned network order to aligned host order
279 static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho)
281 ho->init_seq = get_unaligned_be32(&no->init_seq);
282 ho->delta = get_unaligned_be32(&no->delta);
283 ho->previous_delta = get_unaligned_be32(&no->previous_delta);
287 * Copy of struct ip_vs_seq
288 * From Aligned host order to unaligned network order
290 static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no)
292 put_unaligned_be32(ho->init_seq, &no->init_seq);
293 put_unaligned_be32(ho->delta, &no->delta);
294 put_unaligned_be32(ho->previous_delta, &no->previous_delta);
297 static inline struct ip_vs_sync_buff *
298 sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
300 struct ip_vs_sync_buff *sb;
302 spin_lock_bh(&ipvs->sync_lock);
303 if (list_empty(&ms->sync_queue)) {
305 __set_current_state(TASK_INTERRUPTIBLE);
307 sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff,
310 ms->sync_queue_len--;
311 if (!ms->sync_queue_len)
312 ms->sync_queue_delay = 0;
314 spin_unlock_bh(&ipvs->sync_lock);
320 * Create a new sync buffer for Version 1 proto.
322 static inline struct ip_vs_sync_buff *
323 ip_vs_sync_buff_create(struct netns_ipvs *ipvs)
325 struct ip_vs_sync_buff *sb;
327 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
330 sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC);
335 sb->mesg->reserved = 0; /* old nr_conns i.e. must be zero now */
336 sb->mesg->version = SYNC_PROTO_VER;
337 sb->mesg->syncid = ipvs->master_syncid;
338 sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
339 sb->mesg->nr_conns = 0;
341 sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
342 sb->end = (unsigned char *)sb->mesg + ipvs->send_mesg_maxlen;
344 sb->firstuse = jiffies;
348 static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
354 static inline void sb_queue_tail(struct netns_ipvs *ipvs,
355 struct ipvs_master_sync_state *ms)
357 struct ip_vs_sync_buff *sb = ms->sync_buff;
359 spin_lock(&ipvs->sync_lock);
360 if (ipvs->sync_state & IP_VS_STATE_MASTER &&
361 ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) {
362 if (!ms->sync_queue_len)
363 schedule_delayed_work(&ms->master_wakeup_work,
364 max(IPVS_SYNC_SEND_DELAY, 1));
365 ms->sync_queue_len++;
366 list_add_tail(&sb->list, &ms->sync_queue);
367 if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE)
368 wake_up_process(ms->master_thread);
370 ip_vs_sync_buff_release(sb);
371 spin_unlock(&ipvs->sync_lock);
375 * Get the current sync buffer if it has been created for more
376 * than the specified time or the specified time is zero.
378 static inline struct ip_vs_sync_buff *
379 get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms,
382 struct ip_vs_sync_buff *sb;
384 spin_lock_bh(&ipvs->sync_buff_lock);
386 if (sb && time_after_eq(jiffies - sb->firstuse, time)) {
387 ms->sync_buff = NULL;
388 __set_current_state(TASK_RUNNING);
391 spin_unlock_bh(&ipvs->sync_buff_lock);
396 select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
398 return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask;
402 * Create a new sync buffer for Version 0 proto.
404 static inline struct ip_vs_sync_buff *
405 ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs)
407 struct ip_vs_sync_buff *sb;
408 struct ip_vs_sync_mesg_v0 *mesg;
410 if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
413 sb->mesg = kmalloc(ipvs->send_mesg_maxlen, GFP_ATOMIC);
418 mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
420 mesg->syncid = ipvs->master_syncid;
421 mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
422 sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
423 sb->end = (unsigned char *)mesg + ipvs->send_mesg_maxlen;
424 sb->firstuse = jiffies;
428 /* Check if connection is controlled by persistence */
429 static inline bool in_persistence(struct ip_vs_conn *cp)
431 for (cp = cp->control; cp; cp = cp->control) {
432 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
438 /* Check if conn should be synced.
439 * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
440 * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
441 * sync_retries times with period of sync_refresh_period/8
442 * - (2) if both sync_refresh_period and sync_period are 0 send sync only
443 * for state changes or only once when pkts matches sync_threshold
444 * - (3) templates: rate can be reduced only with sync_refresh_period or
447 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
448 struct ip_vs_conn *cp, int pkts)
450 unsigned long orig = ACCESS_ONCE(cp->sync_endtime);
451 unsigned long now = jiffies;
452 unsigned long n = (now + cp->timeout) & ~3UL;
453 unsigned int sync_refresh_period;
457 /* Check if we sync in current state */
458 if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
460 else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
462 else if (likely(cp->protocol == IPPROTO_TCP)) {
463 if (!((1 << cp->state) &
464 ((1 << IP_VS_TCP_S_ESTABLISHED) |
465 (1 << IP_VS_TCP_S_FIN_WAIT) |
466 (1 << IP_VS_TCP_S_CLOSE) |
467 (1 << IP_VS_TCP_S_CLOSE_WAIT) |
468 (1 << IP_VS_TCP_S_TIME_WAIT))))
470 force = cp->state != cp->old_state;
471 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
473 } else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
474 if (!((1 << cp->state) &
475 ((1 << IP_VS_SCTP_S_ESTABLISHED) |
476 (1 << IP_VS_SCTP_S_SHUTDOWN_SENT) |
477 (1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) |
478 (1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) |
479 (1 << IP_VS_SCTP_S_CLOSED))))
481 force = cp->state != cp->old_state;
482 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
485 /* UDP or another protocol with single state */
489 sync_refresh_period = sysctl_sync_refresh_period(ipvs);
490 if (sync_refresh_period > 0) {
491 long diff = n - orig;
492 long min_diff = max(cp->timeout >> 1, 10UL * HZ);
494 /* Avoid sync if difference is below sync_refresh_period
495 * and below the half timeout.
497 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
498 int retries = orig & 3;
500 if (retries >= sysctl_sync_retries(ipvs))
502 if (time_before(now, orig - cp->timeout +
503 (sync_refresh_period >> 3)))
508 sync_period = sysctl_sync_period(ipvs);
509 if (sync_period > 0) {
510 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
511 pkts % sync_period != sysctl_sync_threshold(ipvs))
513 } else if (sync_refresh_period <= 0 &&
514 pkts != sysctl_sync_threshold(ipvs))
518 cp->old_state = cp->state;
519 n = cmpxchg(&cp->sync_endtime, orig, n);
520 return n == orig || force;
524 * Version 0 , could be switched in by sys_ctl.
525 * Add an ip_vs_conn information into the current sync_buff.
527 static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
530 struct netns_ipvs *ipvs = net_ipvs(net);
531 struct ip_vs_sync_mesg_v0 *m;
532 struct ip_vs_sync_conn_v0 *s;
533 struct ip_vs_sync_buff *buff;
534 struct ipvs_master_sync_state *ms;
538 if (unlikely(cp->af != AF_INET))
540 /* Do not sync ONE PACKET */
541 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
544 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
547 spin_lock_bh(&ipvs->sync_buff_lock);
548 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
549 spin_unlock_bh(&ipvs->sync_buff_lock);
553 id = select_master_thread_id(ipvs, cp);
555 buff = ms->sync_buff;
557 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
558 /* Send buffer if it is for v1 */
560 sb_queue_tail(ipvs, ms);
561 ms->sync_buff = NULL;
566 buff = ip_vs_sync_buff_create_v0(ipvs);
568 spin_unlock_bh(&ipvs->sync_buff_lock);
569 pr_err("ip_vs_sync_buff_create failed.\n");
572 ms->sync_buff = buff;
575 len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
577 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
578 s = (struct ip_vs_sync_conn_v0 *) buff->head;
582 s->protocol = cp->protocol;
583 s->cport = cp->cport;
584 s->vport = cp->vport;
585 s->dport = cp->dport;
586 s->caddr = cp->caddr.ip;
587 s->vaddr = cp->vaddr.ip;
588 s->daddr = cp->daddr.ip;
589 s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
590 s->state = htons(cp->state);
591 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
592 struct ip_vs_sync_conn_options *opt =
593 (struct ip_vs_sync_conn_options *)&s[1];
594 memcpy(opt, &cp->in_seq, sizeof(*opt));
598 m->size = htons(ntohs(m->size) + len);
601 /* check if there is a space for next one */
602 if (buff->head + FULL_CONN_SIZE > buff->end) {
603 sb_queue_tail(ipvs, ms);
604 ms->sync_buff = NULL;
606 spin_unlock_bh(&ipvs->sync_buff_lock);
608 /* synchronize its controller if it has */
611 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
612 pkts = atomic_add_return(1, &cp->in_pkts);
614 pkts = sysctl_sync_threshold(ipvs);
615 ip_vs_sync_conn(net, cp->control, pkts);
620 * Add an ip_vs_conn information into the current sync_buff.
621 * Called by ip_vs_in.
622 * Sending Version 1 messages
624 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts)
626 struct netns_ipvs *ipvs = net_ipvs(net);
627 struct ip_vs_sync_mesg *m;
628 union ip_vs_sync_conn *s;
629 struct ip_vs_sync_buff *buff;
630 struct ipvs_master_sync_state *ms;
633 unsigned int len, pe_name_len, pad;
635 /* Handle old version of the protocol */
636 if (sysctl_sync_ver(ipvs) == 0) {
637 ip_vs_sync_conn_v0(net, cp, pkts);
640 /* Do not sync ONE PACKET */
641 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
644 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
649 if (cp->pe_data_len) {
650 if (!cp->pe_data || !cp->dest) {
651 IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
654 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
657 spin_lock_bh(&ipvs->sync_buff_lock);
658 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
659 spin_unlock_bh(&ipvs->sync_buff_lock);
663 id = select_master_thread_id(ipvs, cp);
666 #ifdef CONFIG_IP_VS_IPV6
667 if (cp->af == AF_INET6)
668 len = sizeof(struct ip_vs_sync_v6);
671 len = sizeof(struct ip_vs_sync_v4);
673 if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
674 len += sizeof(struct ip_vs_sync_conn_options) + 2;
677 len += cp->pe_data_len + 2; /* + Param hdr field */
679 len += pe_name_len + 2;
681 /* check if there is a space for this one */
683 buff = ms->sync_buff;
686 pad = (4 - (size_t) buff->head) & 3;
687 /* Send buffer if it is for v0 */
688 if (buff->head + len + pad > buff->end || m->reserved) {
689 sb_queue_tail(ipvs, ms);
690 ms->sync_buff = NULL;
697 buff = ip_vs_sync_buff_create(ipvs);
699 spin_unlock_bh(&ipvs->sync_buff_lock);
700 pr_err("ip_vs_sync_buff_create failed.\n");
703 ms->sync_buff = buff;
708 buff->head += pad + len;
709 m->size = htons(ntohs(m->size) + pad + len);
710 /* Add ev. padding from prev. sync_conn */
714 s = (union ip_vs_sync_conn *)p;
716 /* Set message type & copy members */
717 s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
718 s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */
719 s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
720 s->v4.state = htons(cp->state);
721 s->v4.protocol = cp->protocol;
722 s->v4.cport = cp->cport;
723 s->v4.vport = cp->vport;
724 s->v4.dport = cp->dport;
725 s->v4.fwmark = htonl(cp->fwmark);
726 s->v4.timeout = htonl(cp->timeout / HZ);
729 #ifdef CONFIG_IP_VS_IPV6
730 if (cp->af == AF_INET6) {
731 p += sizeof(struct ip_vs_sync_v6);
732 s->v6.caddr = cp->caddr.in6;
733 s->v6.vaddr = cp->vaddr.in6;
734 s->v6.daddr = cp->daddr.in6;
738 p += sizeof(struct ip_vs_sync_v4); /* options ptr */
739 s->v4.caddr = cp->caddr.ip;
740 s->v4.vaddr = cp->vaddr.ip;
741 s->v4.daddr = cp->daddr.ip;
743 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
744 *(p++) = IPVS_OPT_SEQ_DATA;
745 *(p++) = sizeof(struct ip_vs_sync_conn_options);
746 hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
747 p += sizeof(struct ip_vs_seq);
748 hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
749 p += sizeof(struct ip_vs_seq);
752 if (cp->pe_data_len && cp->pe_data) {
753 *(p++) = IPVS_OPT_PE_DATA;
754 *(p++) = cp->pe_data_len;
755 memcpy(p, cp->pe_data, cp->pe_data_len);
756 p += cp->pe_data_len;
759 *(p++) = IPVS_OPT_PE_NAME;
760 *(p++) = pe_name_len;
761 memcpy(p, cp->pe->name, pe_name_len);
766 spin_unlock_bh(&ipvs->sync_buff_lock);
769 /* synchronize its controller if it has */
773 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
774 pkts = atomic_add_return(1, &cp->in_pkts);
776 pkts = sysctl_sync_threshold(ipvs);
781 * fill_param used by version 1
784 ip_vs_conn_fill_param_sync(struct net *net, int af, union ip_vs_sync_conn *sc,
785 struct ip_vs_conn_param *p,
786 __u8 *pe_data, unsigned int pe_data_len,
787 __u8 *pe_name, unsigned int pe_name_len)
789 #ifdef CONFIG_IP_VS_IPV6
791 ip_vs_conn_fill_param(net, af, sc->v6.protocol,
792 (const union nf_inet_addr *)&sc->v6.caddr,
794 (const union nf_inet_addr *)&sc->v6.vaddr,
798 ip_vs_conn_fill_param(net, af, sc->v4.protocol,
799 (const union nf_inet_addr *)&sc->v4.caddr,
801 (const union nf_inet_addr *)&sc->v4.vaddr,
806 char buff[IP_VS_PENAME_MAXLEN+1];
808 memcpy(buff, pe_name, pe_name_len);
810 p->pe = __ip_vs_pe_getbyname(buff);
812 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
817 IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
821 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
823 module_put(p->pe->module);
826 p->pe_data_len = pe_data_len;
832 * Connection Add / Update.
833 * Common for version 0 and 1 reception of backup sync_conns.
837 static void ip_vs_proc_conn(struct net *net, struct ip_vs_conn_param *param,
838 unsigned int flags, unsigned int state,
839 unsigned int protocol, unsigned int type,
840 const union nf_inet_addr *daddr, __be16 dport,
841 unsigned long timeout, __u32 fwmark,
842 struct ip_vs_sync_conn_options *opt)
844 struct ip_vs_dest *dest;
845 struct ip_vs_conn *cp;
846 struct netns_ipvs *ipvs = net_ipvs(net);
848 if (!(flags & IP_VS_CONN_F_TEMPLATE))
849 cp = ip_vs_conn_in_get(param);
851 cp = ip_vs_ct_in_get(param);
855 kfree(param->pe_data);
858 spin_lock_bh(&cp->lock);
859 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
860 !(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
861 if (flags & IP_VS_CONN_F_INACTIVE) {
862 atomic_dec(&dest->activeconns);
863 atomic_inc(&dest->inactconns);
865 atomic_inc(&dest->activeconns);
866 atomic_dec(&dest->inactconns);
869 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
870 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
872 spin_unlock_bh(&cp->lock);
874 ip_vs_try_bind_dest(cp);
877 * Find the appropriate destination for the connection.
878 * If it is not found the connection will remain unbound
882 /* This function is only invoked by the synchronization
883 * code. We do not currently support heterogeneous pools
884 * with synchronization, so we can make the assumption that
885 * the svc_af is the same as the dest_af
887 dest = ip_vs_find_dest(net, type, type, daddr, dport,
888 param->vaddr, param->vport, protocol,
891 cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest,
895 kfree(param->pe_data);
896 IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
899 if (!(flags & IP_VS_CONN_F_TEMPLATE))
900 kfree(param->pe_data);
904 memcpy(&cp->in_seq, opt, sizeof(*opt));
905 atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
907 cp->old_state = cp->state;
909 * For Ver 0 messages style
910 * - Not possible to recover the right timeout for templates
911 * - can not find the right fwmark
912 * virtual service. If needed, we can do it for
913 * non-fwmark persistent services.
914 * Ver 1 messages style.
918 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
919 timeout = MAX_SCHEDULE_TIMEOUT / HZ;
920 cp->timeout = timeout*HZ;
922 struct ip_vs_proto_data *pd;
924 pd = ip_vs_proto_data_get(net, protocol);
925 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
926 cp->timeout = pd->timeout_table[state];
928 cp->timeout = (3*60*HZ);
934 * Process received multicast message for Version 0
936 static void ip_vs_process_message_v0(struct net *net, const char *buffer,
939 struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
940 struct ip_vs_sync_conn_v0 *s;
941 struct ip_vs_sync_conn_options *opt;
942 struct ip_vs_protocol *pp;
943 struct ip_vs_conn_param param;
947 p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
948 for (i=0; i<m->nr_conns; i++) {
949 unsigned int flags, state;
951 if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
952 IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
955 s = (struct ip_vs_sync_conn_v0 *) p;
956 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
957 flags &= ~IP_VS_CONN_F_HASHED;
958 if (flags & IP_VS_CONN_F_SEQ_MASK) {
959 opt = (struct ip_vs_sync_conn_options *)&s[1];
961 if (p > buffer+buflen) {
962 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
967 p += SIMPLE_CONN_SIZE;
970 state = ntohs(s->state);
971 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
972 pp = ip_vs_proto_get(s->protocol);
974 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
978 if (state >= pp->num_states) {
979 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
984 /* protocol in templates is not used for state/timeout */
986 IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n",
992 ip_vs_conn_fill_param(net, AF_INET, s->protocol,
993 (const union nf_inet_addr *)&s->caddr,
995 (const union nf_inet_addr *)&s->vaddr,
998 /* Send timeout as Zero */
999 ip_vs_proc_conn(net, ¶m, flags, state, s->protocol, AF_INET,
1000 (union nf_inet_addr *)&s->daddr, s->dport,
1008 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
1010 struct ip_vs_sync_conn_options *opt)
1012 struct ip_vs_sync_conn_options *topt;
1014 topt = (struct ip_vs_sync_conn_options *)p;
1016 if (plen != sizeof(struct ip_vs_sync_conn_options)) {
1017 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1020 if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
1021 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1024 ntoh_seq(&topt->in_seq, &opt->in_seq);
1025 ntoh_seq(&topt->out_seq, &opt->out_seq);
1026 *opt_flags |= IPVS_OPT_F_SEQ_DATA;
1030 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
1031 __u8 **data, unsigned int maxlen,
1032 __u32 *opt_flags, __u32 flag)
1034 if (plen > maxlen) {
1035 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
1038 if (*opt_flags & flag) {
1039 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
1048 * Process a Version 1 sync. connection
1050 static inline int ip_vs_proc_sync_conn(struct net *net, __u8 *p, __u8 *msg_end)
1052 struct ip_vs_sync_conn_options opt;
1053 union ip_vs_sync_conn *s;
1054 struct ip_vs_protocol *pp;
1055 struct ip_vs_conn_param param;
1057 unsigned int af, state, pe_data_len=0, pe_name_len=0;
1058 __u8 *pe_data=NULL, *pe_name=NULL;
1062 s = (union ip_vs_sync_conn *) p;
1064 if (s->v6.type & STYPE_F_INET6) {
1065 #ifdef CONFIG_IP_VS_IPV6
1067 p += sizeof(struct ip_vs_sync_v6);
1069 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1073 } else if (!s->v4.type) {
1075 p += sizeof(struct ip_vs_sync_v4);
1082 /* Process optional params check Type & Len. */
1083 while (p < msg_end) {
1092 if (!plen || ((p + plen) > msg_end))
1094 /* Handle seq option p = param data */
1095 switch (ptype & ~IPVS_OPT_F_PARAM) {
1096 case IPVS_OPT_SEQ_DATA:
1097 if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
1101 case IPVS_OPT_PE_DATA:
1102 if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
1103 IP_VS_PEDATA_MAXLEN, &opt_flags,
1104 IPVS_OPT_F_PE_DATA))
1108 case IPVS_OPT_PE_NAME:
1109 if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
1110 IP_VS_PENAME_MAXLEN, &opt_flags,
1111 IPVS_OPT_F_PE_NAME))
1116 /* Param data mandatory ? */
1117 if (!(ptype & IPVS_OPT_F_PARAM)) {
1118 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1119 ptype & ~IPVS_OPT_F_PARAM);
1124 p += plen; /* Next option */
1127 /* Get flags and Mask off unsupported */
1128 flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
1129 flags |= IP_VS_CONN_F_SYNC;
1130 state = ntohs(s->v4.state);
1132 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
1133 pp = ip_vs_proto_get(s->v4.protocol);
1135 IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1140 if (state >= pp->num_states) {
1141 IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1147 /* protocol in templates is not used for state/timeout */
1149 IP_VS_DBG(3, "BACKUP, Invalid template state %u\n",
1154 if (ip_vs_conn_fill_param_sync(net, af, s, ¶m, pe_data,
1155 pe_data_len, pe_name, pe_name_len)) {
1159 /* If only IPv4, just silent skip IPv6 */
1161 ip_vs_proc_conn(net, ¶m, flags, state, s->v4.protocol, af,
1162 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
1163 ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
1164 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1166 #ifdef CONFIG_IP_VS_IPV6
1168 ip_vs_proc_conn(net, ¶m, flags, state, s->v6.protocol, af,
1169 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
1170 ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
1171 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1174 ip_vs_pe_put(param.pe);
1178 IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc);
1183 * Process received multicast message and create the corresponding
1184 * ip_vs_conn entries.
1185 * Handles Version 0 & 1
1187 static void ip_vs_process_message(struct net *net, __u8 *buffer,
1188 const size_t buflen)
1190 struct netns_ipvs *ipvs = net_ipvs(net);
1191 struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
1195 if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
1196 IP_VS_DBG(2, "BACKUP, message header too short\n");
1200 if (buflen != ntohs(m2->size)) {
1201 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1204 /* SyncID sanity check */
1205 if (ipvs->backup_syncid != 0 && m2->syncid != ipvs->backup_syncid) {
1206 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
1209 /* Handle version 1 message */
1210 if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
1211 && (m2->spare == 0)) {
1213 msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
1214 nr_conns = m2->nr_conns;
1216 for (i=0; i<nr_conns; i++) {
1217 union ip_vs_sync_conn *s;
1222 if (p + sizeof(s->v4) > buffer+buflen) {
1223 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n");
1226 s = (union ip_vs_sync_conn *)p;
1227 size = ntohs(s->v4.ver_size) & SVER_MASK;
1229 /* Basic sanity checks */
1230 if (msg_end > buffer+buflen) {
1231 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1234 if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
1235 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1236 ntohs(s->v4.ver_size) >> SVER_SHIFT);
1239 /* Process a single sync_conn */
1240 retc = ip_vs_proc_sync_conn(net, p, msg_end);
1242 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1246 /* Make sure we have 32 bit alignment */
1247 msg_end = p + ((size + 3) & ~3);
1250 /* Old type of message */
1251 ip_vs_process_message_v0(net, buffer, buflen);
1258 * Setup sndbuf (mode=1) or rcvbuf (mode=0)
1260 static void set_sock_size(struct sock *sk, int mode, int val)
1262 /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1263 /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1266 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
1268 sk->sk_sndbuf = val * 2;
1269 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1271 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
1273 sk->sk_rcvbuf = val * 2;
1274 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1280 * Setup loopback of outgoing multicasts on a sending socket
1282 static void set_mcast_loop(struct sock *sk, u_char loop)
1284 struct inet_sock *inet = inet_sk(sk);
1286 /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1288 inet->mc_loop = loop ? 1 : 0;
1293 * Specify TTL for outgoing multicasts on a sending socket
1295 static void set_mcast_ttl(struct sock *sk, u_char ttl)
1297 struct inet_sock *inet = inet_sk(sk);
1299 /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1306 * Specifiy default interface for outgoing multicasts
1308 static int set_mcast_if(struct sock *sk, char *ifname)
1310 struct net_device *dev;
1311 struct inet_sock *inet = inet_sk(sk);
1312 struct net *net = sock_net(sk);
1314 dev = __dev_get_by_name(net, ifname);
1318 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1322 inet->mc_index = dev->ifindex;
1323 /* inet->mc_addr = 0; */
1331 * Set the maximum length of sync message according to the
1332 * specified interface's MTU.
1334 static int set_sync_mesg_maxlen(struct net *net, int sync_state)
1336 struct netns_ipvs *ipvs = net_ipvs(net);
1337 struct net_device *dev;
1340 if (sync_state == IP_VS_STATE_MASTER) {
1341 dev = __dev_get_by_name(net, ipvs->master_mcast_ifn);
1345 num = (dev->mtu - sizeof(struct iphdr) -
1346 sizeof(struct udphdr) -
1347 SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE;
1348 ipvs->send_mesg_maxlen = SYNC_MESG_HEADER_LEN +
1349 SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF);
1350 IP_VS_DBG(7, "setting the maximum length of sync sending "
1351 "message %d.\n", ipvs->send_mesg_maxlen);
1352 } else if (sync_state == IP_VS_STATE_BACKUP) {
1353 dev = __dev_get_by_name(net, ipvs->backup_mcast_ifn);
1357 ipvs->recv_mesg_maxlen = dev->mtu -
1358 sizeof(struct iphdr) - sizeof(struct udphdr);
1359 IP_VS_DBG(7, "setting the maximum length of sync receiving "
1360 "message %d.\n", ipvs->recv_mesg_maxlen);
1368 * Join a multicast group.
1369 * the group is specified by a class D multicast address 224.0.0.0/8
1370 * in the in_addr structure passed in as a parameter.
1373 join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
1375 struct net *net = sock_net(sk);
1376 struct ip_mreqn mreq;
1377 struct net_device *dev;
1380 memset(&mreq, 0, sizeof(mreq));
1381 memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
1383 dev = __dev_get_by_name(net, ifname);
1386 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1389 mreq.imr_ifindex = dev->ifindex;
1392 ret = ip_mc_join_group(sk, &mreq);
1399 static int bind_mcastif_addr(struct socket *sock, char *ifname)
1401 struct net *net = sock_net(sock->sk);
1402 struct net_device *dev;
1404 struct sockaddr_in sin;
1406 dev = __dev_get_by_name(net, ifname);
1410 addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
1412 pr_err("You probably need to specify IP address on "
1413 "multicast interface.\n");
1415 IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1418 /* Now bind the socket with the address of multicast interface */
1419 sin.sin_family = AF_INET;
1420 sin.sin_addr.s_addr = addr;
1423 return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
1427 * Set up sending multicast socket over UDP
1429 static struct socket *make_send_sock(struct net *net, int id)
1431 struct netns_ipvs *ipvs = net_ipvs(net);
1432 /* multicast addr */
1433 struct sockaddr_in mcast_addr = {
1434 .sin_family = AF_INET,
1435 .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id),
1436 .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP),
1438 struct socket *sock;
1441 /* First create a socket move it to right name space later */
1442 result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1444 pr_err("Error during creation of socket; terminating\n");
1445 return ERR_PTR(result);
1448 * Kernel sockets that are a part of a namespace, should not
1449 * hold a reference to a namespace in order to allow to stop it.
1450 * After sk_change_net should be released using sk_release_kernel.
1452 sk_change_net(sock->sk, net);
1453 result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn);
1455 pr_err("Error setting outbound mcast interface\n");
1459 set_mcast_loop(sock->sk, 0);
1460 set_mcast_ttl(sock->sk, 1);
1461 result = sysctl_sync_sock_size(ipvs);
1463 set_sock_size(sock->sk, 1, result);
1465 result = bind_mcastif_addr(sock, ipvs->master_mcast_ifn);
1467 pr_err("Error binding address of the mcast interface\n");
1471 result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
1472 sizeof(struct sockaddr), 0);
1474 pr_err("Error connecting to the multicast addr\n");
1481 sk_release_kernel(sock->sk);
1482 return ERR_PTR(result);
1487 * Set up receiving multicast socket over UDP
1489 static struct socket *make_receive_sock(struct net *net, int id)
1491 struct netns_ipvs *ipvs = net_ipvs(net);
1492 /* multicast addr */
1493 struct sockaddr_in mcast_addr = {
1494 .sin_family = AF_INET,
1495 .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id),
1496 .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP),
1498 struct socket *sock;
1501 /* First create a socket */
1502 result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1504 pr_err("Error during creation of socket; terminating\n");
1505 return ERR_PTR(result);
1508 * Kernel sockets that are a part of a namespace, should not
1509 * hold a reference to a namespace in order to allow to stop it.
1510 * After sk_change_net should be released using sk_release_kernel.
1512 sk_change_net(sock->sk, net);
1513 /* it is equivalent to the REUSEADDR option in user-space */
1514 sock->sk->sk_reuse = SK_CAN_REUSE;
1515 result = sysctl_sync_sock_size(ipvs);
1517 set_sock_size(sock->sk, 0, result);
1519 result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr,
1520 sizeof(struct sockaddr));
1522 pr_err("Error binding to the multicast addr\n");
1526 /* join the multicast group */
1527 result = join_mcast_group(sock->sk,
1528 (struct in_addr *) &mcast_addr.sin_addr,
1529 ipvs->backup_mcast_ifn);
1531 pr_err("Error joining to the multicast group\n");
1538 sk_release_kernel(sock->sk);
1539 return ERR_PTR(result);
1544 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
1546 struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
1551 iov.iov_base = (void *)buffer;
1552 iov.iov_len = length;
1554 len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
1561 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
1566 msize = ntohs(msg->size);
1568 ret = ip_vs_send_async(sock, (char *)msg, msize);
1569 if (ret >= 0 || ret == -EAGAIN)
1571 pr_err("ip_vs_send_async error %d\n", ret);
1576 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
1578 struct msghdr msg = {NULL,};
1584 /* Receive a packet */
1585 iov.iov_base = buffer;
1586 iov.iov_len = (size_t)buflen;
1588 len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, MSG_DONTWAIT);
1597 /* Wakeup the master thread for sending */
1598 static void master_wakeup_work_handler(struct work_struct *work)
1600 struct ipvs_master_sync_state *ms =
1601 container_of(work, struct ipvs_master_sync_state,
1602 master_wakeup_work.work);
1603 struct netns_ipvs *ipvs = ms->ipvs;
1605 spin_lock_bh(&ipvs->sync_lock);
1606 if (ms->sync_queue_len &&
1607 ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
1608 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
1609 wake_up_process(ms->master_thread);
1611 spin_unlock_bh(&ipvs->sync_lock);
1614 /* Get next buffer to send */
1615 static inline struct ip_vs_sync_buff *
1616 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
1618 struct ip_vs_sync_buff *sb;
1620 sb = sb_dequeue(ipvs, ms);
1623 /* Do not delay entries in buffer for more than 2 seconds */
1624 return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
1627 static int sync_thread_master(void *data)
1629 struct ip_vs_sync_thread_data *tinfo = data;
1630 struct netns_ipvs *ipvs = net_ipvs(tinfo->net);
1631 struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
1632 struct sock *sk = tinfo->sock->sk;
1633 struct ip_vs_sync_buff *sb;
1635 pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1636 "syncid = %d, id = %d\n",
1637 ipvs->master_mcast_ifn, ipvs->master_syncid, tinfo->id);
1640 sb = next_sync_buff(ipvs, ms);
1641 if (unlikely(kthread_should_stop()))
1644 schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
1647 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
1648 /* (Ab)use interruptible sleep to avoid increasing
1651 __wait_event_interruptible(*sk_sleep(sk),
1652 sock_writeable(sk) ||
1653 kthread_should_stop());
1654 if (unlikely(kthread_should_stop()))
1657 ip_vs_sync_buff_release(sb);
1661 __set_current_state(TASK_RUNNING);
1663 ip_vs_sync_buff_release(sb);
1665 /* clean up the sync_buff queue */
1666 while ((sb = sb_dequeue(ipvs, ms)))
1667 ip_vs_sync_buff_release(sb);
1668 __set_current_state(TASK_RUNNING);
1670 /* clean up the current sync_buff */
1671 sb = get_curr_sync_buff(ipvs, ms, 0);
1673 ip_vs_sync_buff_release(sb);
1675 /* release the sending multicast socket */
1676 sk_release_kernel(tinfo->sock->sk);
1683 static int sync_thread_backup(void *data)
1685 struct ip_vs_sync_thread_data *tinfo = data;
1686 struct netns_ipvs *ipvs = net_ipvs(tinfo->net);
1689 pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1690 "syncid = %d, id = %d\n",
1691 ipvs->backup_mcast_ifn, ipvs->backup_syncid, tinfo->id);
1693 while (!kthread_should_stop()) {
1694 wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
1695 !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
1696 || kthread_should_stop());
1698 /* do we have data now? */
1699 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
1700 len = ip_vs_receive(tinfo->sock, tinfo->buf,
1701 ipvs->recv_mesg_maxlen);
1704 pr_err("receiving message error\n");
1708 ip_vs_process_message(tinfo->net, tinfo->buf, len);
1712 /* release the sending multicast socket */
1713 sk_release_kernel(tinfo->sock->sk);
1721 int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
1723 struct ip_vs_sync_thread_data *tinfo;
1724 struct task_struct **array = NULL, *task;
1725 struct socket *sock;
1726 struct netns_ipvs *ipvs = net_ipvs(net);
1728 int (*threadfn)(void *data);
1730 int result = -ENOMEM;
1732 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1733 IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
1734 sizeof(struct ip_vs_sync_conn_v0));
1736 if (!ipvs->sync_state) {
1737 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
1738 ipvs->threads_mask = count - 1;
1740 count = ipvs->threads_mask + 1;
1742 if (state == IP_VS_STATE_MASTER) {
1746 strlcpy(ipvs->master_mcast_ifn, mcast_ifn,
1747 sizeof(ipvs->master_mcast_ifn));
1748 ipvs->master_syncid = syncid;
1749 name = "ipvs-m:%d:%d";
1750 threadfn = sync_thread_master;
1751 } else if (state == IP_VS_STATE_BACKUP) {
1752 if (ipvs->backup_threads)
1755 strlcpy(ipvs->backup_mcast_ifn, mcast_ifn,
1756 sizeof(ipvs->backup_mcast_ifn));
1757 ipvs->backup_syncid = syncid;
1758 name = "ipvs-b:%d:%d";
1759 threadfn = sync_thread_backup;
1764 if (state == IP_VS_STATE_MASTER) {
1765 struct ipvs_master_sync_state *ms;
1767 ipvs->ms = kzalloc(count * sizeof(ipvs->ms[0]), GFP_KERNEL);
1771 for (id = 0; id < count; id++, ms++) {
1772 INIT_LIST_HEAD(&ms->sync_queue);
1773 ms->sync_queue_len = 0;
1774 ms->sync_queue_delay = 0;
1775 INIT_DELAYED_WORK(&ms->master_wakeup_work,
1776 master_wakeup_work_handler);
1780 array = kzalloc(count * sizeof(struct task_struct *),
1785 set_sync_mesg_maxlen(net, state);
1788 for (id = 0; id < count; id++) {
1789 if (state == IP_VS_STATE_MASTER)
1790 sock = make_send_sock(net, id);
1792 sock = make_receive_sock(net, id);
1794 result = PTR_ERR(sock);
1797 tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
1802 if (state == IP_VS_STATE_BACKUP) {
1803 tinfo->buf = kmalloc(ipvs->recv_mesg_maxlen,
1812 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
1814 result = PTR_ERR(task);
1818 if (state == IP_VS_STATE_MASTER)
1819 ipvs->ms[id].master_thread = task;
1824 /* mark as active */
1826 if (state == IP_VS_STATE_BACKUP)
1827 ipvs->backup_threads = array;
1828 spin_lock_bh(&ipvs->sync_buff_lock);
1829 ipvs->sync_state |= state;
1830 spin_unlock_bh(&ipvs->sync_buff_lock);
1832 /* increase the module use count */
1833 ip_vs_use_count_inc();
1838 sk_release_kernel(sock->sk);
1842 sk_release_kernel(tinfo->sock->sk);
1847 while (count-- > 0) {
1848 if (state == IP_VS_STATE_MASTER)
1849 kthread_stop(ipvs->ms[count].master_thread);
1851 kthread_stop(array[count]);
1856 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
1864 int stop_sync_thread(struct net *net, int state)
1866 struct netns_ipvs *ipvs = net_ipvs(net);
1867 struct task_struct **array;
1871 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1873 if (state == IP_VS_STATE_MASTER) {
1878 * The lock synchronizes with sb_queue_tail(), so that we don't
1879 * add sync buffers to the queue, when we are already in
1880 * progress of stopping the master sync daemon.
1883 spin_lock_bh(&ipvs->sync_buff_lock);
1884 spin_lock(&ipvs->sync_lock);
1885 ipvs->sync_state &= ~IP_VS_STATE_MASTER;
1886 spin_unlock(&ipvs->sync_lock);
1887 spin_unlock_bh(&ipvs->sync_buff_lock);
1890 for (id = ipvs->threads_mask; id >= 0; id--) {
1891 struct ipvs_master_sync_state *ms = &ipvs->ms[id];
1894 pr_info("stopping master sync thread %d ...\n",
1895 task_pid_nr(ms->master_thread));
1896 cancel_delayed_work_sync(&ms->master_wakeup_work);
1897 ret = kthread_stop(ms->master_thread);
1903 } else if (state == IP_VS_STATE_BACKUP) {
1904 if (!ipvs->backup_threads)
1907 ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
1908 array = ipvs->backup_threads;
1910 for (id = ipvs->threads_mask; id >= 0; id--) {
1913 pr_info("stopping backup sync thread %d ...\n",
1914 task_pid_nr(array[id]));
1915 ret = kthread_stop(array[id]);
1920 ipvs->backup_threads = NULL;
1923 /* decrease the module use count */
1924 ip_vs_use_count_dec();
1930 * Initialize data struct for each netns
1932 int __net_init ip_vs_sync_net_init(struct net *net)
1934 struct netns_ipvs *ipvs = net_ipvs(net);
1936 __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
1937 spin_lock_init(&ipvs->sync_lock);
1938 spin_lock_init(&ipvs->sync_buff_lock);
1942 void ip_vs_sync_net_cleanup(struct net *net)
1945 struct netns_ipvs *ipvs = net_ipvs(net);
1947 mutex_lock(&ipvs->sync_mutex);
1948 retc = stop_sync_thread(net, IP_VS_STATE_MASTER);
1949 if (retc && retc != -ESRCH)
1950 pr_err("Failed to stop Master Daemon\n");
1952 retc = stop_sync_thread(net, IP_VS_STATE_BACKUP);
1953 if (retc && retc != -ESRCH)
1954 pr_err("Failed to stop Backup Daemon\n");
1955 mutex_unlock(&ipvs->sync_mutex);