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: $Id: ip_vs_conn.c,v 1.31 2003/04/18 09:03:16 wensong Exp $
10 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
11 * Peter Kese <peter.kese@ijs.si>
12 * Julian Anastasov <ja@ssi.bg>
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
19 * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
20 * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
21 * and others. Many code here is taken from IP MASQ code of kernel 2.2.
27 #include <linux/kernel.h>
28 #include <linux/vmalloc.h>
29 #include <linux/proc_fs.h> /* for proc_net_* */
30 #include <linux/seq_file.h>
31 #include <linux/jhash.h>
32 #include <linux/random.h>
34 #include <net/ip_vs.h>
38 * Connection hash table: for input and output packets lookups of IPVS
40 static struct list_head *ip_vs_conn_tab;
42 /* SLAB cache for IPVS connections */
43 static kmem_cache_t *ip_vs_conn_cachep __read_mostly;
45 /* counter for current IPVS connections */
46 static atomic_t ip_vs_conn_count = ATOMIC_INIT(0);
48 /* counter for no client port connections */
49 static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0);
51 /* random value for IPVS connection hash */
52 static unsigned int ip_vs_conn_rnd;
55 * Fine locking granularity for big connection hash table
57 #define CT_LOCKARRAY_BITS 4
58 #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
59 #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
61 struct ip_vs_aligned_lock
64 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
66 /* lock array for conn table */
67 static struct ip_vs_aligned_lock
68 __ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned;
70 static inline void ct_read_lock(unsigned key)
72 read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
75 static inline void ct_read_unlock(unsigned key)
77 read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
80 static inline void ct_write_lock(unsigned key)
82 write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
85 static inline void ct_write_unlock(unsigned key)
87 write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
90 static inline void ct_read_lock_bh(unsigned key)
92 read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
95 static inline void ct_read_unlock_bh(unsigned key)
97 read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
100 static inline void ct_write_lock_bh(unsigned key)
102 write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
105 static inline void ct_write_unlock_bh(unsigned key)
107 write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
112 * Returns hash value for IPVS connection entry
114 static unsigned int ip_vs_conn_hashkey(unsigned proto, __u32 addr, __u16 port)
116 return jhash_3words(addr, port, proto, ip_vs_conn_rnd)
117 & IP_VS_CONN_TAB_MASK;
122 * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port.
123 * returns bool success.
125 static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
130 /* Hash by protocol, client address and port */
131 hash = ip_vs_conn_hashkey(cp->protocol, cp->caddr, cp->cport);
135 if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
136 list_add(&cp->c_list, &ip_vs_conn_tab[hash]);
137 cp->flags |= IP_VS_CONN_F_HASHED;
138 atomic_inc(&cp->refcnt);
141 IP_VS_ERR("ip_vs_conn_hash(): request for already hashed, "
142 "called from %p\n", __builtin_return_address(0));
146 ct_write_unlock(hash);
153 * UNhashes ip_vs_conn from ip_vs_conn_tab.
154 * returns bool success.
156 static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
161 /* unhash it and decrease its reference counter */
162 hash = ip_vs_conn_hashkey(cp->protocol, cp->caddr, cp->cport);
166 if (cp->flags & IP_VS_CONN_F_HASHED) {
167 list_del(&cp->c_list);
168 cp->flags &= ~IP_VS_CONN_F_HASHED;
169 atomic_dec(&cp->refcnt);
174 ct_write_unlock(hash);
181 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
182 * Called for pkts coming from OUTside-to-INside.
183 * s_addr, s_port: pkt source address (foreign host)
184 * d_addr, d_port: pkt dest address (load balancer)
186 static inline struct ip_vs_conn *__ip_vs_conn_in_get
187 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port)
190 struct ip_vs_conn *cp;
192 hash = ip_vs_conn_hashkey(protocol, s_addr, s_port);
196 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
197 if (s_addr==cp->caddr && s_port==cp->cport &&
198 d_port==cp->vport && d_addr==cp->vaddr &&
199 ((!s_port) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) &&
200 protocol==cp->protocol) {
202 atomic_inc(&cp->refcnt);
203 ct_read_unlock(hash);
208 ct_read_unlock(hash);
213 struct ip_vs_conn *ip_vs_conn_in_get
214 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port)
216 struct ip_vs_conn *cp;
218 cp = __ip_vs_conn_in_get(protocol, s_addr, s_port, d_addr, d_port);
219 if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt))
220 cp = __ip_vs_conn_in_get(protocol, s_addr, 0, d_addr, d_port);
222 IP_VS_DBG(7, "lookup/in %s %u.%u.%u.%u:%d->%u.%u.%u.%u:%d %s\n",
223 ip_vs_proto_name(protocol),
224 NIPQUAD(s_addr), ntohs(s_port),
225 NIPQUAD(d_addr), ntohs(d_port),
231 /* Get reference to connection template */
232 struct ip_vs_conn *ip_vs_ct_in_get
233 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port)
236 struct ip_vs_conn *cp;
238 hash = ip_vs_conn_hashkey(protocol, s_addr, s_port);
242 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
243 if (s_addr==cp->caddr && s_port==cp->cport &&
244 d_port==cp->vport && d_addr==cp->vaddr &&
245 cp->flags & IP_VS_CONN_F_TEMPLATE &&
246 protocol==cp->protocol) {
248 atomic_inc(&cp->refcnt);
255 ct_read_unlock(hash);
257 IP_VS_DBG(7, "template lookup/in %s %u.%u.%u.%u:%d->%u.%u.%u.%u:%d %s\n",
258 ip_vs_proto_name(protocol),
259 NIPQUAD(s_addr), ntohs(s_port),
260 NIPQUAD(d_addr), ntohs(d_port),
267 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
268 * Called for pkts coming from inside-to-OUTside.
269 * s_addr, s_port: pkt source address (inside host)
270 * d_addr, d_port: pkt dest address (foreign host)
272 struct ip_vs_conn *ip_vs_conn_out_get
273 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port)
276 struct ip_vs_conn *cp, *ret=NULL;
279 * Check for "full" addressed entries
281 hash = ip_vs_conn_hashkey(protocol, d_addr, d_port);
285 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
286 if (d_addr == cp->caddr && d_port == cp->cport &&
287 s_port == cp->dport && s_addr == cp->daddr &&
288 protocol == cp->protocol) {
290 atomic_inc(&cp->refcnt);
296 ct_read_unlock(hash);
298 IP_VS_DBG(7, "lookup/out %s %u.%u.%u.%u:%d->%u.%u.%u.%u:%d %s\n",
299 ip_vs_proto_name(protocol),
300 NIPQUAD(s_addr), ntohs(s_port),
301 NIPQUAD(d_addr), ntohs(d_port),
302 ret?"hit":"not hit");
309 * Put back the conn and restart its timer with its timeout
311 void ip_vs_conn_put(struct ip_vs_conn *cp)
313 /* reset it expire in its timeout */
314 mod_timer(&cp->timer, jiffies+cp->timeout);
316 __ip_vs_conn_put(cp);
321 * Fill a no_client_port connection with a client port number
323 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __u16 cport)
325 if (ip_vs_conn_unhash(cp)) {
326 spin_lock(&cp->lock);
327 if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
328 atomic_dec(&ip_vs_conn_no_cport_cnt);
329 cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
332 spin_unlock(&cp->lock);
334 /* hash on new dport */
341 * Bind a connection entry with the corresponding packet_xmit.
342 * Called by ip_vs_conn_new.
344 static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp)
346 switch (IP_VS_FWD_METHOD(cp)) {
347 case IP_VS_CONN_F_MASQ:
348 cp->packet_xmit = ip_vs_nat_xmit;
351 case IP_VS_CONN_F_TUNNEL:
352 cp->packet_xmit = ip_vs_tunnel_xmit;
355 case IP_VS_CONN_F_DROUTE:
356 cp->packet_xmit = ip_vs_dr_xmit;
359 case IP_VS_CONN_F_LOCALNODE:
360 cp->packet_xmit = ip_vs_null_xmit;
363 case IP_VS_CONN_F_BYPASS:
364 cp->packet_xmit = ip_vs_bypass_xmit;
370 static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest)
372 return atomic_read(&dest->activeconns)
373 + atomic_read(&dest->inactconns);
377 * Bind a connection entry with a virtual service destination
378 * Called just after a new connection entry is created.
381 ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
383 /* if dest is NULL, then return directly */
387 /* Increase the refcnt counter of the dest */
388 atomic_inc(&dest->refcnt);
390 /* Bind with the destination and its corresponding transmitter */
391 cp->flags |= atomic_read(&dest->conn_flags);
394 IP_VS_DBG(9, "Bind-dest %s c:%u.%u.%u.%u:%d v:%u.%u.%u.%u:%d "
395 "d:%u.%u.%u.%u:%d fwd:%c s:%u flg:%X cnt:%d destcnt:%d\n",
396 ip_vs_proto_name(cp->protocol),
397 NIPQUAD(cp->caddr), ntohs(cp->cport),
398 NIPQUAD(cp->vaddr), ntohs(cp->vport),
399 NIPQUAD(cp->daddr), ntohs(cp->dport),
400 ip_vs_fwd_tag(cp), cp->state,
401 cp->flags, atomic_read(&cp->refcnt),
402 atomic_read(&dest->refcnt));
404 /* Update the connection counters */
405 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
406 /* It is a normal connection, so increase the inactive
407 connection counter because it is in TCP SYNRECV
408 state (inactive) or other protocol inacive state */
409 atomic_inc(&dest->inactconns);
411 /* It is a persistent connection/template, so increase
412 the peristent connection counter */
413 atomic_inc(&dest->persistconns);
416 if (dest->u_threshold != 0 &&
417 ip_vs_dest_totalconns(dest) >= dest->u_threshold)
418 dest->flags |= IP_VS_DEST_F_OVERLOAD;
423 * Unbind a connection entry with its VS destination
424 * Called by the ip_vs_conn_expire function.
426 static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
428 struct ip_vs_dest *dest = cp->dest;
433 IP_VS_DBG(9, "Unbind-dest %s c:%u.%u.%u.%u:%d v:%u.%u.%u.%u:%d "
434 "d:%u.%u.%u.%u:%d fwd:%c s:%u flg:%X cnt:%d destcnt:%d\n",
435 ip_vs_proto_name(cp->protocol),
436 NIPQUAD(cp->caddr), ntohs(cp->cport),
437 NIPQUAD(cp->vaddr), ntohs(cp->vport),
438 NIPQUAD(cp->daddr), ntohs(cp->dport),
439 ip_vs_fwd_tag(cp), cp->state,
440 cp->flags, atomic_read(&cp->refcnt),
441 atomic_read(&dest->refcnt));
443 /* Update the connection counters */
444 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
445 /* It is a normal connection, so decrease the inactconns
446 or activeconns counter */
447 if (cp->flags & IP_VS_CONN_F_INACTIVE) {
448 atomic_dec(&dest->inactconns);
450 atomic_dec(&dest->activeconns);
453 /* It is a persistent connection/template, so decrease
454 the peristent connection counter */
455 atomic_dec(&dest->persistconns);
458 if (dest->l_threshold != 0) {
459 if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
460 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
461 } else if (dest->u_threshold != 0) {
462 if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
463 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
465 if (dest->flags & IP_VS_DEST_F_OVERLOAD)
466 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
470 * Simply decrease the refcnt of the dest, because the
471 * dest will be either in service's destination list
474 atomic_dec(&dest->refcnt);
479 * Checking if the destination of a connection template is available.
480 * If available, return 1, otherwise invalidate this connection
481 * template and return 0.
483 int ip_vs_check_template(struct ip_vs_conn *ct)
485 struct ip_vs_dest *dest = ct->dest;
488 * Checking the dest server status.
490 if ((dest == NULL) ||
491 !(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
492 (sysctl_ip_vs_expire_quiescent_template &&
493 (atomic_read(&dest->weight) == 0))) {
494 IP_VS_DBG(9, "check_template: dest not available for "
495 "protocol %s s:%u.%u.%u.%u:%d v:%u.%u.%u.%u:%d "
496 "-> d:%u.%u.%u.%u:%d\n",
497 ip_vs_proto_name(ct->protocol),
498 NIPQUAD(ct->caddr), ntohs(ct->cport),
499 NIPQUAD(ct->vaddr), ntohs(ct->vport),
500 NIPQUAD(ct->daddr), ntohs(ct->dport));
503 * Invalidate the connection template
505 if (ct->vport != 65535) {
506 if (ip_vs_conn_unhash(ct)) {
515 * Simply decrease the refcnt of the template,
516 * don't restart its timer.
518 atomic_dec(&ct->refcnt);
524 static void ip_vs_conn_expire(unsigned long data)
526 struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
533 atomic_inc(&cp->refcnt);
536 * do I control anybody?
538 if (atomic_read(&cp->n_control))
542 * unhash it if it is hashed in the conn table
544 if (!ip_vs_conn_unhash(cp))
548 * refcnt==1 implies I'm the only one referrer
550 if (likely(atomic_read(&cp->refcnt) == 1)) {
551 /* delete the timer if it is activated by other users */
552 if (timer_pending(&cp->timer))
553 del_timer(&cp->timer);
555 /* does anybody control me? */
557 ip_vs_control_del(cp);
559 if (unlikely(cp->app != NULL))
560 ip_vs_unbind_app(cp);
561 ip_vs_unbind_dest(cp);
562 if (cp->flags & IP_VS_CONN_F_NO_CPORT)
563 atomic_dec(&ip_vs_conn_no_cport_cnt);
564 atomic_dec(&ip_vs_conn_count);
566 kmem_cache_free(ip_vs_conn_cachep, cp);
570 /* hash it back to the table */
574 IP_VS_DBG(7, "delayed: refcnt-1=%d conn.n_control=%d\n",
575 atomic_read(&cp->refcnt)-1,
576 atomic_read(&cp->n_control));
582 void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
584 if (del_timer(&cp->timer))
585 mod_timer(&cp->timer, jiffies);
590 * Create a new connection entry and hash it into the ip_vs_conn_tab
593 ip_vs_conn_new(int proto, __u32 caddr, __u16 cport, __u32 vaddr, __u16 vport,
594 __u32 daddr, __u16 dport, unsigned flags,
595 struct ip_vs_dest *dest)
597 struct ip_vs_conn *cp;
598 struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
600 cp = kmem_cache_alloc(ip_vs_conn_cachep, GFP_ATOMIC);
602 IP_VS_ERR_RL("ip_vs_conn_new: no memory available.\n");
606 memset(cp, 0, sizeof(*cp));
607 INIT_LIST_HEAD(&cp->c_list);
608 init_timer(&cp->timer);
609 cp->timer.data = (unsigned long)cp;
610 cp->timer.function = ip_vs_conn_expire;
611 cp->protocol = proto;
619 spin_lock_init(&cp->lock);
622 * Set the entry is referenced by the current thread before hashing
623 * it in the table, so that other thread run ip_vs_random_dropentry
624 * but cannot drop this entry.
626 atomic_set(&cp->refcnt, 1);
628 atomic_set(&cp->n_control, 0);
629 atomic_set(&cp->in_pkts, 0);
631 atomic_inc(&ip_vs_conn_count);
632 if (flags & IP_VS_CONN_F_NO_CPORT)
633 atomic_inc(&ip_vs_conn_no_cport_cnt);
635 /* Bind the connection with a destination server */
636 ip_vs_bind_dest(cp, dest);
638 /* Set its state and timeout */
642 /* Bind its packet transmitter */
645 if (unlikely(pp && atomic_read(&pp->appcnt)))
646 ip_vs_bind_app(cp, pp);
648 /* Hash it in the ip_vs_conn_tab finally */
656 * /proc/net/ip_vs_conn entries
658 #ifdef CONFIG_PROC_FS
660 static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
663 struct ip_vs_conn *cp;
665 for(idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) {
666 ct_read_lock_bh(idx);
667 list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
669 seq->private = &ip_vs_conn_tab[idx];
673 ct_read_unlock_bh(idx);
679 static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
682 return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
685 static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
687 struct ip_vs_conn *cp = v;
688 struct list_head *e, *l = seq->private;
692 if (v == SEQ_START_TOKEN)
693 return ip_vs_conn_array(seq, 0);
695 /* more on same hash chain? */
696 if ((e = cp->c_list.next) != l)
697 return list_entry(e, struct ip_vs_conn, c_list);
699 idx = l - ip_vs_conn_tab;
700 ct_read_unlock_bh(idx);
702 while (++idx < IP_VS_CONN_TAB_SIZE) {
703 ct_read_lock_bh(idx);
704 list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
705 seq->private = &ip_vs_conn_tab[idx];
708 ct_read_unlock_bh(idx);
714 static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
716 struct list_head *l = seq->private;
719 ct_read_unlock_bh(l - ip_vs_conn_tab);
722 static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
725 if (v == SEQ_START_TOKEN)
727 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires\n");
729 const struct ip_vs_conn *cp = v;
732 "%-3s %08X %04X %08X %04X %08X %04X %-11s %7lu\n",
733 ip_vs_proto_name(cp->protocol),
734 ntohl(cp->caddr), ntohs(cp->cport),
735 ntohl(cp->vaddr), ntohs(cp->vport),
736 ntohl(cp->daddr), ntohs(cp->dport),
737 ip_vs_state_name(cp->protocol, cp->state),
738 (cp->timer.expires-jiffies)/HZ);
743 static struct seq_operations ip_vs_conn_seq_ops = {
744 .start = ip_vs_conn_seq_start,
745 .next = ip_vs_conn_seq_next,
746 .stop = ip_vs_conn_seq_stop,
747 .show = ip_vs_conn_seq_show,
750 static int ip_vs_conn_open(struct inode *inode, struct file *file)
752 return seq_open(file, &ip_vs_conn_seq_ops);
755 static struct file_operations ip_vs_conn_fops = {
756 .owner = THIS_MODULE,
757 .open = ip_vs_conn_open,
760 .release = seq_release,
766 * Randomly drop connection entries before running out of memory
768 static inline int todrop_entry(struct ip_vs_conn *cp)
771 * The drop rate array needs tuning for real environments.
772 * Called from timer bh only => no locking
774 static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
775 static char todrop_counter[9] = {0};
778 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
779 This will leave enough time for normal connection to get
781 if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
784 /* Don't drop the entry if its number of incoming packets is not
786 i = atomic_read(&cp->in_pkts);
787 if (i > 8 || i < 0) return 0;
789 if (!todrop_rate[i]) return 0;
790 if (--todrop_counter[i] > 0) return 0;
792 todrop_counter[i] = todrop_rate[i];
796 /* Called from keventd and must protect itself from softirqs */
797 void ip_vs_random_dropentry(void)
800 struct ip_vs_conn *cp;
803 * Randomly scan 1/32 of the whole table every second
805 for (idx = 0; idx < (IP_VS_CONN_TAB_SIZE>>5); idx++) {
806 unsigned hash = net_random() & IP_VS_CONN_TAB_MASK;
809 * Lock is actually needed in this loop.
811 ct_write_lock_bh(hash);
813 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
814 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
815 /* connection template */
818 if (cp->protocol == IPPROTO_TCP) {
820 case IP_VS_TCP_S_SYN_RECV:
821 case IP_VS_TCP_S_SYNACK:
824 case IP_VS_TCP_S_ESTABLISHED:
825 if (todrop_entry(cp))
833 if (!todrop_entry(cp))
837 IP_VS_DBG(4, "del connection\n");
838 ip_vs_conn_expire_now(cp);
840 IP_VS_DBG(4, "del conn template\n");
841 ip_vs_conn_expire_now(cp->control);
844 ct_write_unlock_bh(hash);
850 * Flush all the connection entries in the ip_vs_conn_tab
852 static void ip_vs_conn_flush(void)
855 struct ip_vs_conn *cp;
858 for (idx=0; idx<IP_VS_CONN_TAB_SIZE; idx++) {
860 * Lock is actually needed in this loop.
862 ct_write_lock_bh(idx);
864 list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
866 IP_VS_DBG(4, "del connection\n");
867 ip_vs_conn_expire_now(cp);
869 IP_VS_DBG(4, "del conn template\n");
870 ip_vs_conn_expire_now(cp->control);
873 ct_write_unlock_bh(idx);
876 /* the counter may be not NULL, because maybe some conn entries
877 are run by slow timer handler or unhashed but still referred */
878 if (atomic_read(&ip_vs_conn_count) != 0) {
885 int ip_vs_conn_init(void)
890 * Allocate the connection hash table and initialize its list heads
892 ip_vs_conn_tab = vmalloc(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head));
896 /* Allocate ip_vs_conn slab cache */
897 ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
898 sizeof(struct ip_vs_conn), 0,
899 SLAB_HWCACHE_ALIGN, NULL, NULL);
900 if (!ip_vs_conn_cachep) {
901 vfree(ip_vs_conn_tab);
905 IP_VS_INFO("Connection hash table configured "
906 "(size=%d, memory=%ldKbytes)\n",
908 (long)(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head))/1024);
909 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
910 sizeof(struct ip_vs_conn));
912 for (idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) {
913 INIT_LIST_HEAD(&ip_vs_conn_tab[idx]);
916 for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
917 rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
920 proc_net_fops_create("ip_vs_conn", 0, &ip_vs_conn_fops);
922 /* calculate the random value for connection hash */
923 get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
929 void ip_vs_conn_cleanup(void)
931 /* flush all the connection entries first */
934 /* Release the empty cache */
935 kmem_cache_destroy(ip_vs_conn_cachep);
936 proc_net_remove("ip_vs_conn");
937 vfree(ip_vs_conn_tab);