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 conn should be synced.
429 * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
430 * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
431 * sync_retries times with period of sync_refresh_period/8
432 * - (2) if both sync_refresh_period and sync_period are 0 send sync only
433 * for state changes or only once when pkts matches sync_threshold
434 * - (3) templates: rate can be reduced only with sync_refresh_period or
437 static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
438 struct ip_vs_conn *cp, int pkts)
440 unsigned long orig = ACCESS_ONCE(cp->sync_endtime);
441 unsigned long now = jiffies;
442 unsigned long n = (now + cp->timeout) & ~3UL;
443 unsigned int sync_refresh_period;
447 /* Check if we sync in current state */
448 if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
450 else if (likely(cp->protocol == IPPROTO_TCP)) {
451 if (!((1 << cp->state) &
452 ((1 << IP_VS_TCP_S_ESTABLISHED) |
453 (1 << IP_VS_TCP_S_FIN_WAIT) |
454 (1 << IP_VS_TCP_S_CLOSE) |
455 (1 << IP_VS_TCP_S_CLOSE_WAIT) |
456 (1 << IP_VS_TCP_S_TIME_WAIT))))
458 force = cp->state != cp->old_state;
459 if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
461 } else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
462 if (!((1 << cp->state) &
463 ((1 << IP_VS_SCTP_S_ESTABLISHED) |
464 (1 << IP_VS_SCTP_S_CLOSED) |
465 (1 << IP_VS_SCTP_S_SHUT_ACK_CLI) |
466 (1 << IP_VS_SCTP_S_SHUT_ACK_SER))))
468 force = cp->state != cp->old_state;
469 if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
472 /* UDP or another protocol with single state */
476 sync_refresh_period = sysctl_sync_refresh_period(ipvs);
477 if (sync_refresh_period > 0) {
478 long diff = n - orig;
479 long min_diff = max(cp->timeout >> 1, 10UL * HZ);
481 /* Avoid sync if difference is below sync_refresh_period
482 * and below the half timeout.
484 if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
485 int retries = orig & 3;
487 if (retries >= sysctl_sync_retries(ipvs))
489 if (time_before(now, orig - cp->timeout +
490 (sync_refresh_period >> 3)))
495 sync_period = sysctl_sync_period(ipvs);
496 if (sync_period > 0) {
497 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
498 pkts % sync_period != sysctl_sync_threshold(ipvs))
500 } else if (sync_refresh_period <= 0 &&
501 pkts != sysctl_sync_threshold(ipvs))
505 cp->old_state = cp->state;
506 n = cmpxchg(&cp->sync_endtime, orig, n);
507 return n == orig || force;
511 * Version 0 , could be switched in by sys_ctl.
512 * Add an ip_vs_conn information into the current sync_buff.
514 static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
517 struct netns_ipvs *ipvs = net_ipvs(net);
518 struct ip_vs_sync_mesg_v0 *m;
519 struct ip_vs_sync_conn_v0 *s;
520 struct ip_vs_sync_buff *buff;
521 struct ipvs_master_sync_state *ms;
525 if (unlikely(cp->af != AF_INET))
527 /* Do not sync ONE PACKET */
528 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
531 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
534 spin_lock_bh(&ipvs->sync_buff_lock);
535 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
536 spin_unlock_bh(&ipvs->sync_buff_lock);
540 id = select_master_thread_id(ipvs, cp);
542 buff = ms->sync_buff;
544 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
545 /* Send buffer if it is for v1 */
547 sb_queue_tail(ipvs, ms);
548 ms->sync_buff = NULL;
553 buff = ip_vs_sync_buff_create_v0(ipvs);
555 spin_unlock_bh(&ipvs->sync_buff_lock);
556 pr_err("ip_vs_sync_buff_create failed.\n");
559 ms->sync_buff = buff;
562 len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
564 m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
565 s = (struct ip_vs_sync_conn_v0 *) buff->head;
569 s->protocol = cp->protocol;
570 s->cport = cp->cport;
571 s->vport = cp->vport;
572 s->dport = cp->dport;
573 s->caddr = cp->caddr.ip;
574 s->vaddr = cp->vaddr.ip;
575 s->daddr = cp->daddr.ip;
576 s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
577 s->state = htons(cp->state);
578 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
579 struct ip_vs_sync_conn_options *opt =
580 (struct ip_vs_sync_conn_options *)&s[1];
581 memcpy(opt, &cp->in_seq, sizeof(*opt));
585 m->size = htons(ntohs(m->size) + len);
588 /* check if there is a space for next one */
589 if (buff->head + FULL_CONN_SIZE > buff->end) {
590 sb_queue_tail(ipvs, ms);
591 ms->sync_buff = NULL;
593 spin_unlock_bh(&ipvs->sync_buff_lock);
595 /* synchronize its controller if it has */
598 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
599 pkts = atomic_add_return(1, &cp->in_pkts);
601 pkts = sysctl_sync_threshold(ipvs);
602 ip_vs_sync_conn(net, cp, pkts);
607 * Add an ip_vs_conn information into the current sync_buff.
608 * Called by ip_vs_in.
609 * Sending Version 1 messages
611 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts)
613 struct netns_ipvs *ipvs = net_ipvs(net);
614 struct ip_vs_sync_mesg *m;
615 union ip_vs_sync_conn *s;
616 struct ip_vs_sync_buff *buff;
617 struct ipvs_master_sync_state *ms;
620 unsigned int len, pe_name_len, pad;
622 /* Handle old version of the protocol */
623 if (sysctl_sync_ver(ipvs) == 0) {
624 ip_vs_sync_conn_v0(net, cp, pkts);
627 /* Do not sync ONE PACKET */
628 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
631 if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
636 if (cp->pe_data_len) {
637 if (!cp->pe_data || !cp->dest) {
638 IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
641 pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
644 spin_lock_bh(&ipvs->sync_buff_lock);
645 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
646 spin_unlock_bh(&ipvs->sync_buff_lock);
650 id = select_master_thread_id(ipvs, cp);
653 #ifdef CONFIG_IP_VS_IPV6
654 if (cp->af == AF_INET6)
655 len = sizeof(struct ip_vs_sync_v6);
658 len = sizeof(struct ip_vs_sync_v4);
660 if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
661 len += sizeof(struct ip_vs_sync_conn_options) + 2;
664 len += cp->pe_data_len + 2; /* + Param hdr field */
666 len += pe_name_len + 2;
668 /* check if there is a space for this one */
670 buff = ms->sync_buff;
673 pad = (4 - (size_t) buff->head) & 3;
674 /* Send buffer if it is for v0 */
675 if (buff->head + len + pad > buff->end || m->reserved) {
676 sb_queue_tail(ipvs, ms);
677 ms->sync_buff = NULL;
684 buff = ip_vs_sync_buff_create(ipvs);
686 spin_unlock_bh(&ipvs->sync_buff_lock);
687 pr_err("ip_vs_sync_buff_create failed.\n");
690 ms->sync_buff = buff;
695 buff->head += pad + len;
696 m->size = htons(ntohs(m->size) + pad + len);
697 /* Add ev. padding from prev. sync_conn */
701 s = (union ip_vs_sync_conn *)p;
703 /* Set message type & copy members */
704 s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
705 s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */
706 s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
707 s->v4.state = htons(cp->state);
708 s->v4.protocol = cp->protocol;
709 s->v4.cport = cp->cport;
710 s->v4.vport = cp->vport;
711 s->v4.dport = cp->dport;
712 s->v4.fwmark = htonl(cp->fwmark);
713 s->v4.timeout = htonl(cp->timeout / HZ);
716 #ifdef CONFIG_IP_VS_IPV6
717 if (cp->af == AF_INET6) {
718 p += sizeof(struct ip_vs_sync_v6);
719 s->v6.caddr = cp->caddr.in6;
720 s->v6.vaddr = cp->vaddr.in6;
721 s->v6.daddr = cp->daddr.in6;
725 p += sizeof(struct ip_vs_sync_v4); /* options ptr */
726 s->v4.caddr = cp->caddr.ip;
727 s->v4.vaddr = cp->vaddr.ip;
728 s->v4.daddr = cp->daddr.ip;
730 if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
731 *(p++) = IPVS_OPT_SEQ_DATA;
732 *(p++) = sizeof(struct ip_vs_sync_conn_options);
733 hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
734 p += sizeof(struct ip_vs_seq);
735 hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
736 p += sizeof(struct ip_vs_seq);
739 if (cp->pe_data_len && cp->pe_data) {
740 *(p++) = IPVS_OPT_PE_DATA;
741 *(p++) = cp->pe_data_len;
742 memcpy(p, cp->pe_data, cp->pe_data_len);
743 p += cp->pe_data_len;
746 *(p++) = IPVS_OPT_PE_NAME;
747 *(p++) = pe_name_len;
748 memcpy(p, cp->pe->name, pe_name_len);
753 spin_unlock_bh(&ipvs->sync_buff_lock);
756 /* synchronize its controller if it has */
760 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
761 pkts = atomic_add_return(1, &cp->in_pkts);
763 pkts = sysctl_sync_threshold(ipvs);
768 * fill_param used by version 1
771 ip_vs_conn_fill_param_sync(struct net *net, int af, union ip_vs_sync_conn *sc,
772 struct ip_vs_conn_param *p,
773 __u8 *pe_data, unsigned int pe_data_len,
774 __u8 *pe_name, unsigned int pe_name_len)
776 #ifdef CONFIG_IP_VS_IPV6
778 ip_vs_conn_fill_param(net, af, sc->v6.protocol,
779 (const union nf_inet_addr *)&sc->v6.caddr,
781 (const union nf_inet_addr *)&sc->v6.vaddr,
785 ip_vs_conn_fill_param(net, af, sc->v4.protocol,
786 (const union nf_inet_addr *)&sc->v4.caddr,
788 (const union nf_inet_addr *)&sc->v4.vaddr,
793 char buff[IP_VS_PENAME_MAXLEN+1];
795 memcpy(buff, pe_name, pe_name_len);
797 p->pe = __ip_vs_pe_getbyname(buff);
799 IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
804 IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
808 p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
811 module_put(p->pe->module);
814 p->pe_data_len = pe_data_len;
820 * Connection Add / Update.
821 * Common for version 0 and 1 reception of backup sync_conns.
825 static void ip_vs_proc_conn(struct net *net, struct ip_vs_conn_param *param,
826 unsigned int flags, unsigned int state,
827 unsigned int protocol, unsigned int type,
828 const union nf_inet_addr *daddr, __be16 dport,
829 unsigned long timeout, __u32 fwmark,
830 struct ip_vs_sync_conn_options *opt)
832 struct ip_vs_dest *dest;
833 struct ip_vs_conn *cp;
834 struct netns_ipvs *ipvs = net_ipvs(net);
836 if (!(flags & IP_VS_CONN_F_TEMPLATE))
837 cp = ip_vs_conn_in_get(param);
839 cp = ip_vs_ct_in_get(param);
843 kfree(param->pe_data);
846 spin_lock_bh(&cp->lock);
847 if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
848 !(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
849 if (flags & IP_VS_CONN_F_INACTIVE) {
850 atomic_dec(&dest->activeconns);
851 atomic_inc(&dest->inactconns);
853 atomic_inc(&dest->activeconns);
854 atomic_dec(&dest->inactconns);
857 flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
858 flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
860 spin_unlock_bh(&cp->lock);
862 ip_vs_try_bind_dest(cp);
865 * Find the appropriate destination for the connection.
866 * If it is not found the connection will remain unbound
870 dest = ip_vs_find_dest(net, type, daddr, dport, param->vaddr,
871 param->vport, protocol, fwmark, flags);
873 cp = ip_vs_conn_new(param, daddr, dport, flags, dest, fwmark);
877 kfree(param->pe_data);
878 IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
881 if (!(flags & IP_VS_CONN_F_TEMPLATE))
882 kfree(param->pe_data);
886 memcpy(&cp->in_seq, opt, sizeof(*opt));
887 atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
889 cp->old_state = cp->state;
891 * For Ver 0 messages style
892 * - Not possible to recover the right timeout for templates
893 * - can not find the right fwmark
894 * virtual service. If needed, we can do it for
895 * non-fwmark persistent services.
896 * Ver 1 messages style.
900 if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
901 timeout = MAX_SCHEDULE_TIMEOUT / HZ;
902 cp->timeout = timeout*HZ;
904 struct ip_vs_proto_data *pd;
906 pd = ip_vs_proto_data_get(net, protocol);
907 if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
908 cp->timeout = pd->timeout_table[state];
910 cp->timeout = (3*60*HZ);
916 * Process received multicast message for Version 0
918 static void ip_vs_process_message_v0(struct net *net, const char *buffer,
921 struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
922 struct ip_vs_sync_conn_v0 *s;
923 struct ip_vs_sync_conn_options *opt;
924 struct ip_vs_protocol *pp;
925 struct ip_vs_conn_param param;
929 p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
930 for (i=0; i<m->nr_conns; i++) {
931 unsigned int flags, state;
933 if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
934 IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
937 s = (struct ip_vs_sync_conn_v0 *) p;
938 flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
939 flags &= ~IP_VS_CONN_F_HASHED;
940 if (flags & IP_VS_CONN_F_SEQ_MASK) {
941 opt = (struct ip_vs_sync_conn_options *)&s[1];
943 if (p > buffer+buflen) {
944 IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
949 p += SIMPLE_CONN_SIZE;
952 state = ntohs(s->state);
953 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
954 pp = ip_vs_proto_get(s->protocol);
956 IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
960 if (state >= pp->num_states) {
961 IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
966 /* protocol in templates is not used for state/timeout */
968 IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n",
974 ip_vs_conn_fill_param(net, AF_INET, s->protocol,
975 (const union nf_inet_addr *)&s->caddr,
977 (const union nf_inet_addr *)&s->vaddr,
980 /* Send timeout as Zero */
981 ip_vs_proc_conn(net, ¶m, flags, state, s->protocol, AF_INET,
982 (union nf_inet_addr *)&s->daddr, s->dport,
990 static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
992 struct ip_vs_sync_conn_options *opt)
994 struct ip_vs_sync_conn_options *topt;
996 topt = (struct ip_vs_sync_conn_options *)p;
998 if (plen != sizeof(struct ip_vs_sync_conn_options)) {
999 IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
1002 if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
1003 IP_VS_DBG(2, "BACKUP, conn options found twice\n");
1006 ntoh_seq(&topt->in_seq, &opt->in_seq);
1007 ntoh_seq(&topt->out_seq, &opt->out_seq);
1008 *opt_flags |= IPVS_OPT_F_SEQ_DATA;
1012 static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
1013 __u8 **data, unsigned int maxlen,
1014 __u32 *opt_flags, __u32 flag)
1016 if (plen > maxlen) {
1017 IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
1020 if (*opt_flags & flag) {
1021 IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
1030 * Process a Version 1 sync. connection
1032 static inline int ip_vs_proc_sync_conn(struct net *net, __u8 *p, __u8 *msg_end)
1034 struct ip_vs_sync_conn_options opt;
1035 union ip_vs_sync_conn *s;
1036 struct ip_vs_protocol *pp;
1037 struct ip_vs_conn_param param;
1039 unsigned int af, state, pe_data_len=0, pe_name_len=0;
1040 __u8 *pe_data=NULL, *pe_name=NULL;
1044 s = (union ip_vs_sync_conn *) p;
1046 if (s->v6.type & STYPE_F_INET6) {
1047 #ifdef CONFIG_IP_VS_IPV6
1049 p += sizeof(struct ip_vs_sync_v6);
1051 IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
1055 } else if (!s->v4.type) {
1057 p += sizeof(struct ip_vs_sync_v4);
1064 /* Process optional params check Type & Len. */
1065 while (p < msg_end) {
1074 if (!plen || ((p + plen) > msg_end))
1076 /* Handle seq option p = param data */
1077 switch (ptype & ~IPVS_OPT_F_PARAM) {
1078 case IPVS_OPT_SEQ_DATA:
1079 if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
1083 case IPVS_OPT_PE_DATA:
1084 if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
1085 IP_VS_PEDATA_MAXLEN, &opt_flags,
1086 IPVS_OPT_F_PE_DATA))
1090 case IPVS_OPT_PE_NAME:
1091 if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
1092 IP_VS_PENAME_MAXLEN, &opt_flags,
1093 IPVS_OPT_F_PE_NAME))
1098 /* Param data mandatory ? */
1099 if (!(ptype & IPVS_OPT_F_PARAM)) {
1100 IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
1101 ptype & ~IPVS_OPT_F_PARAM);
1106 p += plen; /* Next option */
1109 /* Get flags and Mask off unsupported */
1110 flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
1111 flags |= IP_VS_CONN_F_SYNC;
1112 state = ntohs(s->v4.state);
1114 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
1115 pp = ip_vs_proto_get(s->v4.protocol);
1117 IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
1122 if (state >= pp->num_states) {
1123 IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
1129 /* protocol in templates is not used for state/timeout */
1131 IP_VS_DBG(3, "BACKUP, Invalid template state %u\n",
1136 if (ip_vs_conn_fill_param_sync(net, af, s, ¶m, pe_data,
1137 pe_data_len, pe_name, pe_name_len)) {
1141 /* If only IPv4, just silent skip IPv6 */
1143 ip_vs_proc_conn(net, ¶m, flags, state, s->v4.protocol, af,
1144 (union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
1145 ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
1146 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1148 #ifdef CONFIG_IP_VS_IPV6
1150 ip_vs_proc_conn(net, ¶m, flags, state, s->v6.protocol, af,
1151 (union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
1152 ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
1153 (opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
1156 ip_vs_pe_put(param.pe);
1160 IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc);
1165 * Process received multicast message and create the corresponding
1166 * ip_vs_conn entries.
1167 * Handles Version 0 & 1
1169 static void ip_vs_process_message(struct net *net, __u8 *buffer,
1170 const size_t buflen)
1172 struct netns_ipvs *ipvs = net_ipvs(net);
1173 struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
1177 if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
1178 IP_VS_DBG(2, "BACKUP, message header too short\n");
1182 if (buflen != ntohs(m2->size)) {
1183 IP_VS_DBG(2, "BACKUP, bogus message size\n");
1186 /* SyncID sanity check */
1187 if (ipvs->backup_syncid != 0 && m2->syncid != ipvs->backup_syncid) {
1188 IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
1191 /* Handle version 1 message */
1192 if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
1193 && (m2->spare == 0)) {
1195 msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
1196 nr_conns = m2->nr_conns;
1198 for (i=0; i<nr_conns; i++) {
1199 union ip_vs_sync_conn *s;
1204 if (p + sizeof(s->v4) > buffer+buflen) {
1205 IP_VS_ERR_RL("BACKUP, Dropping buffer, to small\n");
1208 s = (union ip_vs_sync_conn *)p;
1209 size = ntohs(s->v4.ver_size) & SVER_MASK;
1211 /* Basic sanity checks */
1212 if (msg_end > buffer+buflen) {
1213 IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
1216 if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
1217 IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
1218 ntohs(s->v4.ver_size) >> SVER_SHIFT);
1221 /* Process a single sync_conn */
1222 retc = ip_vs_proc_sync_conn(net, p, msg_end);
1224 IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
1228 /* Make sure we have 32 bit alignment */
1229 msg_end = p + ((size + 3) & ~3);
1232 /* Old type of message */
1233 ip_vs_process_message_v0(net, buffer, buflen);
1240 * Setup sndbuf (mode=1) or rcvbuf (mode=0)
1242 static void set_sock_size(struct sock *sk, int mode, int val)
1244 /* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
1245 /* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
1248 val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
1250 sk->sk_sndbuf = val * 2;
1251 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1253 val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
1255 sk->sk_rcvbuf = val * 2;
1256 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1262 * Setup loopback of outgoing multicasts on a sending socket
1264 static void set_mcast_loop(struct sock *sk, u_char loop)
1266 struct inet_sock *inet = inet_sk(sk);
1268 /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
1270 inet->mc_loop = loop ? 1 : 0;
1275 * Specify TTL for outgoing multicasts on a sending socket
1277 static void set_mcast_ttl(struct sock *sk, u_char ttl)
1279 struct inet_sock *inet = inet_sk(sk);
1281 /* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
1288 * Specifiy default interface for outgoing multicasts
1290 static int set_mcast_if(struct sock *sk, char *ifname)
1292 struct net_device *dev;
1293 struct inet_sock *inet = inet_sk(sk);
1294 struct net *net = sock_net(sk);
1296 dev = __dev_get_by_name(net, ifname);
1300 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1304 inet->mc_index = dev->ifindex;
1305 /* inet->mc_addr = 0; */
1313 * Set the maximum length of sync message according to the
1314 * specified interface's MTU.
1316 static int set_sync_mesg_maxlen(struct net *net, int sync_state)
1318 struct netns_ipvs *ipvs = net_ipvs(net);
1319 struct net_device *dev;
1322 if (sync_state == IP_VS_STATE_MASTER) {
1323 dev = __dev_get_by_name(net, ipvs->master_mcast_ifn);
1327 num = (dev->mtu - sizeof(struct iphdr) -
1328 sizeof(struct udphdr) -
1329 SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE;
1330 ipvs->send_mesg_maxlen = SYNC_MESG_HEADER_LEN +
1331 SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF);
1332 IP_VS_DBG(7, "setting the maximum length of sync sending "
1333 "message %d.\n", ipvs->send_mesg_maxlen);
1334 } else if (sync_state == IP_VS_STATE_BACKUP) {
1335 dev = __dev_get_by_name(net, ipvs->backup_mcast_ifn);
1339 ipvs->recv_mesg_maxlen = dev->mtu -
1340 sizeof(struct iphdr) - sizeof(struct udphdr);
1341 IP_VS_DBG(7, "setting the maximum length of sync receiving "
1342 "message %d.\n", ipvs->recv_mesg_maxlen);
1350 * Join a multicast group.
1351 * the group is specified by a class D multicast address 224.0.0.0/8
1352 * in the in_addr structure passed in as a parameter.
1355 join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
1357 struct net *net = sock_net(sk);
1358 struct ip_mreqn mreq;
1359 struct net_device *dev;
1362 memset(&mreq, 0, sizeof(mreq));
1363 memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
1365 dev = __dev_get_by_name(net, ifname);
1368 if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
1371 mreq.imr_ifindex = dev->ifindex;
1374 ret = ip_mc_join_group(sk, &mreq);
1381 static int bind_mcastif_addr(struct socket *sock, char *ifname)
1383 struct net *net = sock_net(sock->sk);
1384 struct net_device *dev;
1386 struct sockaddr_in sin;
1388 dev = __dev_get_by_name(net, ifname);
1392 addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
1394 pr_err("You probably need to specify IP address on "
1395 "multicast interface.\n");
1397 IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
1400 /* Now bind the socket with the address of multicast interface */
1401 sin.sin_family = AF_INET;
1402 sin.sin_addr.s_addr = addr;
1405 return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
1409 * Set up sending multicast socket over UDP
1411 static struct socket *make_send_sock(struct net *net, int id)
1413 struct netns_ipvs *ipvs = net_ipvs(net);
1414 /* multicast addr */
1415 struct sockaddr_in mcast_addr = {
1416 .sin_family = AF_INET,
1417 .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id),
1418 .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP),
1420 struct socket *sock;
1423 /* First create a socket move it to right name space later */
1424 result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1426 pr_err("Error during creation of socket; terminating\n");
1427 return ERR_PTR(result);
1430 * Kernel sockets that are a part of a namespace, should not
1431 * hold a reference to a namespace in order to allow to stop it.
1432 * After sk_change_net should be released using sk_release_kernel.
1434 sk_change_net(sock->sk, net);
1435 result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn);
1437 pr_err("Error setting outbound mcast interface\n");
1441 set_mcast_loop(sock->sk, 0);
1442 set_mcast_ttl(sock->sk, 1);
1443 result = sysctl_sync_sock_size(ipvs);
1445 set_sock_size(sock->sk, 1, result);
1447 result = bind_mcastif_addr(sock, ipvs->master_mcast_ifn);
1449 pr_err("Error binding address of the mcast interface\n");
1453 result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
1454 sizeof(struct sockaddr), 0);
1456 pr_err("Error connecting to the multicast addr\n");
1463 sk_release_kernel(sock->sk);
1464 return ERR_PTR(result);
1469 * Set up receiving multicast socket over UDP
1471 static struct socket *make_receive_sock(struct net *net, int id)
1473 struct netns_ipvs *ipvs = net_ipvs(net);
1474 /* multicast addr */
1475 struct sockaddr_in mcast_addr = {
1476 .sin_family = AF_INET,
1477 .sin_port = cpu_to_be16(IP_VS_SYNC_PORT + id),
1478 .sin_addr.s_addr = cpu_to_be32(IP_VS_SYNC_GROUP),
1480 struct socket *sock;
1483 /* First create a socket */
1484 result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1486 pr_err("Error during creation of socket; terminating\n");
1487 return ERR_PTR(result);
1490 * Kernel sockets that are a part of a namespace, should not
1491 * hold a reference to a namespace in order to allow to stop it.
1492 * After sk_change_net should be released using sk_release_kernel.
1494 sk_change_net(sock->sk, net);
1495 /* it is equivalent to the REUSEADDR option in user-space */
1496 sock->sk->sk_reuse = SK_CAN_REUSE;
1497 result = sysctl_sync_sock_size(ipvs);
1499 set_sock_size(sock->sk, 0, result);
1501 result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr,
1502 sizeof(struct sockaddr));
1504 pr_err("Error binding to the multicast addr\n");
1508 /* join the multicast group */
1509 result = join_mcast_group(sock->sk,
1510 (struct in_addr *) &mcast_addr.sin_addr,
1511 ipvs->backup_mcast_ifn);
1513 pr_err("Error joining to the multicast group\n");
1520 sk_release_kernel(sock->sk);
1521 return ERR_PTR(result);
1526 ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
1528 struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
1533 iov.iov_base = (void *)buffer;
1534 iov.iov_len = length;
1536 len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
1543 ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
1548 msize = ntohs(msg->size);
1550 ret = ip_vs_send_async(sock, (char *)msg, msize);
1551 if (ret >= 0 || ret == -EAGAIN)
1553 pr_err("ip_vs_send_async error %d\n", ret);
1558 ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
1560 struct msghdr msg = {NULL,};
1566 /* Receive a packet */
1567 iov.iov_base = buffer;
1568 iov.iov_len = (size_t)buflen;
1570 len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, MSG_DONTWAIT);
1579 /* Wakeup the master thread for sending */
1580 static void master_wakeup_work_handler(struct work_struct *work)
1582 struct ipvs_master_sync_state *ms =
1583 container_of(work, struct ipvs_master_sync_state,
1584 master_wakeup_work.work);
1585 struct netns_ipvs *ipvs = ms->ipvs;
1587 spin_lock_bh(&ipvs->sync_lock);
1588 if (ms->sync_queue_len &&
1589 ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
1590 ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
1591 wake_up_process(ms->master_thread);
1593 spin_unlock_bh(&ipvs->sync_lock);
1596 /* Get next buffer to send */
1597 static inline struct ip_vs_sync_buff *
1598 next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
1600 struct ip_vs_sync_buff *sb;
1602 sb = sb_dequeue(ipvs, ms);
1605 /* Do not delay entries in buffer for more than 2 seconds */
1606 return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
1609 static int sync_thread_master(void *data)
1611 struct ip_vs_sync_thread_data *tinfo = data;
1612 struct netns_ipvs *ipvs = net_ipvs(tinfo->net);
1613 struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
1614 struct sock *sk = tinfo->sock->sk;
1615 struct ip_vs_sync_buff *sb;
1617 pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
1618 "syncid = %d, id = %d\n",
1619 ipvs->master_mcast_ifn, ipvs->master_syncid, tinfo->id);
1622 sb = next_sync_buff(ipvs, ms);
1623 if (unlikely(kthread_should_stop()))
1626 schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
1629 while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
1632 __wait_event_interruptible(*sk_sleep(sk),
1633 sock_writeable(sk) ||
1634 kthread_should_stop(),
1636 if (unlikely(kthread_should_stop()))
1639 ip_vs_sync_buff_release(sb);
1643 __set_current_state(TASK_RUNNING);
1645 ip_vs_sync_buff_release(sb);
1647 /* clean up the sync_buff queue */
1648 while ((sb = sb_dequeue(ipvs, ms)))
1649 ip_vs_sync_buff_release(sb);
1650 __set_current_state(TASK_RUNNING);
1652 /* clean up the current sync_buff */
1653 sb = get_curr_sync_buff(ipvs, ms, 0);
1655 ip_vs_sync_buff_release(sb);
1657 /* release the sending multicast socket */
1658 sk_release_kernel(tinfo->sock->sk);
1665 static int sync_thread_backup(void *data)
1667 struct ip_vs_sync_thread_data *tinfo = data;
1668 struct netns_ipvs *ipvs = net_ipvs(tinfo->net);
1671 pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
1672 "syncid = %d, id = %d\n",
1673 ipvs->backup_mcast_ifn, ipvs->backup_syncid, tinfo->id);
1675 while (!kthread_should_stop()) {
1676 wait_event_interruptible(*sk_sleep(tinfo->sock->sk),
1677 !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
1678 || kthread_should_stop());
1680 /* do we have data now? */
1681 while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
1682 len = ip_vs_receive(tinfo->sock, tinfo->buf,
1683 ipvs->recv_mesg_maxlen);
1686 pr_err("receiving message error\n");
1690 ip_vs_process_message(tinfo->net, tinfo->buf, len);
1694 /* release the sending multicast socket */
1695 sk_release_kernel(tinfo->sock->sk);
1703 int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
1705 struct ip_vs_sync_thread_data *tinfo;
1706 struct task_struct **array = NULL, *task;
1707 struct socket *sock;
1708 struct netns_ipvs *ipvs = net_ipvs(net);
1710 int (*threadfn)(void *data);
1712 int result = -ENOMEM;
1714 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1715 IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
1716 sizeof(struct ip_vs_sync_conn_v0));
1718 if (!ipvs->sync_state) {
1719 count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
1720 ipvs->threads_mask = count - 1;
1722 count = ipvs->threads_mask + 1;
1724 if (state == IP_VS_STATE_MASTER) {
1728 strlcpy(ipvs->master_mcast_ifn, mcast_ifn,
1729 sizeof(ipvs->master_mcast_ifn));
1730 ipvs->master_syncid = syncid;
1731 name = "ipvs-m:%d:%d";
1732 threadfn = sync_thread_master;
1733 } else if (state == IP_VS_STATE_BACKUP) {
1734 if (ipvs->backup_threads)
1737 strlcpy(ipvs->backup_mcast_ifn, mcast_ifn,
1738 sizeof(ipvs->backup_mcast_ifn));
1739 ipvs->backup_syncid = syncid;
1740 name = "ipvs-b:%d:%d";
1741 threadfn = sync_thread_backup;
1746 if (state == IP_VS_STATE_MASTER) {
1747 struct ipvs_master_sync_state *ms;
1749 ipvs->ms = kzalloc(count * sizeof(ipvs->ms[0]), GFP_KERNEL);
1753 for (id = 0; id < count; id++, ms++) {
1754 INIT_LIST_HEAD(&ms->sync_queue);
1755 ms->sync_queue_len = 0;
1756 ms->sync_queue_delay = 0;
1757 INIT_DELAYED_WORK(&ms->master_wakeup_work,
1758 master_wakeup_work_handler);
1762 array = kzalloc(count * sizeof(struct task_struct *),
1767 set_sync_mesg_maxlen(net, state);
1770 for (id = 0; id < count; id++) {
1771 if (state == IP_VS_STATE_MASTER)
1772 sock = make_send_sock(net, id);
1774 sock = make_receive_sock(net, id);
1776 result = PTR_ERR(sock);
1779 tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
1784 if (state == IP_VS_STATE_BACKUP) {
1785 tinfo->buf = kmalloc(ipvs->recv_mesg_maxlen,
1794 task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
1796 result = PTR_ERR(task);
1800 if (state == IP_VS_STATE_MASTER)
1801 ipvs->ms[id].master_thread = task;
1806 /* mark as active */
1808 if (state == IP_VS_STATE_BACKUP)
1809 ipvs->backup_threads = array;
1810 spin_lock_bh(&ipvs->sync_buff_lock);
1811 ipvs->sync_state |= state;
1812 spin_unlock_bh(&ipvs->sync_buff_lock);
1814 /* increase the module use count */
1815 ip_vs_use_count_inc();
1820 sk_release_kernel(sock->sk);
1824 sk_release_kernel(tinfo->sock->sk);
1829 while (count-- > 0) {
1830 if (state == IP_VS_STATE_MASTER)
1831 kthread_stop(ipvs->ms[count].master_thread);
1833 kthread_stop(array[count]);
1838 if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
1846 int stop_sync_thread(struct net *net, int state)
1848 struct netns_ipvs *ipvs = net_ipvs(net);
1849 struct task_struct **array;
1853 IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
1855 if (state == IP_VS_STATE_MASTER) {
1860 * The lock synchronizes with sb_queue_tail(), so that we don't
1861 * add sync buffers to the queue, when we are already in
1862 * progress of stopping the master sync daemon.
1865 spin_lock_bh(&ipvs->sync_buff_lock);
1866 spin_lock(&ipvs->sync_lock);
1867 ipvs->sync_state &= ~IP_VS_STATE_MASTER;
1868 spin_unlock(&ipvs->sync_lock);
1869 spin_unlock_bh(&ipvs->sync_buff_lock);
1872 for (id = ipvs->threads_mask; id >= 0; id--) {
1873 struct ipvs_master_sync_state *ms = &ipvs->ms[id];
1876 pr_info("stopping master sync thread %d ...\n",
1877 task_pid_nr(ms->master_thread));
1878 cancel_delayed_work_sync(&ms->master_wakeup_work);
1879 ret = kthread_stop(ms->master_thread);
1885 } else if (state == IP_VS_STATE_BACKUP) {
1886 if (!ipvs->backup_threads)
1889 ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
1890 array = ipvs->backup_threads;
1892 for (id = ipvs->threads_mask; id >= 0; id--) {
1895 pr_info("stopping backup sync thread %d ...\n",
1896 task_pid_nr(array[id]));
1897 ret = kthread_stop(array[id]);
1902 ipvs->backup_threads = NULL;
1905 /* decrease the module use count */
1906 ip_vs_use_count_dec();
1912 * Initialize data struct for each netns
1914 int __net_init ip_vs_sync_net_init(struct net *net)
1916 struct netns_ipvs *ipvs = net_ipvs(net);
1918 __mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
1919 spin_lock_init(&ipvs->sync_lock);
1920 spin_lock_init(&ipvs->sync_buff_lock);
1924 void ip_vs_sync_net_cleanup(struct net *net)
1927 struct netns_ipvs *ipvs = net_ipvs(net);
1929 mutex_lock(&ipvs->sync_mutex);
1930 retc = stop_sync_thread(net, IP_VS_STATE_MASTER);
1931 if (retc && retc != -ESRCH)
1932 pr_err("Failed to stop Master Daemon\n");
1934 retc = stop_sync_thread(net, IP_VS_STATE_BACKUP);
1935 if (retc && retc != -ESRCH)
1936 pr_err("Failed to stop Backup Daemon\n");
1937 mutex_unlock(&ipvs->sync_mutex);