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 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
9 * Peter Kese <peter.kese@ijs.si>
10 * Julian Anastasov <ja@ssi.bg>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
17 * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
18 * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
19 * and others. Many code here is taken from IP MASQ code of kernel 2.2.
25 #define KMSG_COMPONENT "IPVS"
26 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28 #include <linux/interrupt.h>
30 #include <linux/net.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/vmalloc.h>
34 #include <linux/proc_fs.h> /* for proc_net_* */
35 #include <linux/slab.h>
36 #include <linux/seq_file.h>
37 #include <linux/jhash.h>
38 #include <linux/random.h>
40 #include <net/net_namespace.h>
41 #include <net/ip_vs.h>
44 #ifndef CONFIG_IP_VS_TAB_BITS
45 #define CONFIG_IP_VS_TAB_BITS 12
49 * Connection hash size. Default is what was selected at compile time.
51 int ip_vs_conn_tab_bits
= CONFIG_IP_VS_TAB_BITS
;
52 module_param_named(conn_tab_bits
, ip_vs_conn_tab_bits
, int, 0444);
53 MODULE_PARM_DESC(conn_tab_bits
, "Set connections' hash size");
55 /* size and mask values */
56 int ip_vs_conn_tab_size
;
57 int ip_vs_conn_tab_mask
;
60 * Connection hash table: for input and output packets lookups of IPVS
62 static struct list_head
*ip_vs_conn_tab
;
64 /* SLAB cache for IPVS connections */
65 static struct kmem_cache
*ip_vs_conn_cachep __read_mostly
;
67 /* counter for current IPVS connections */
68 static atomic_t ip_vs_conn_count
= ATOMIC_INIT(0);
70 /* counter for no client port connections */
71 static atomic_t ip_vs_conn_no_cport_cnt
= ATOMIC_INIT(0);
73 /* random value for IPVS connection hash */
74 static unsigned int ip_vs_conn_rnd
;
77 * Fine locking granularity for big connection hash table
79 #define CT_LOCKARRAY_BITS 4
80 #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
81 #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
83 struct ip_vs_aligned_lock
86 } __attribute__((__aligned__(SMP_CACHE_BYTES
)));
88 /* lock array for conn table */
89 static struct ip_vs_aligned_lock
90 __ip_vs_conntbl_lock_array
[CT_LOCKARRAY_SIZE
] __cacheline_aligned
;
92 static inline void ct_read_lock(unsigned key
)
94 read_lock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
97 static inline void ct_read_unlock(unsigned key
)
99 read_unlock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
102 static inline void ct_write_lock(unsigned key
)
104 write_lock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
107 static inline void ct_write_unlock(unsigned key
)
109 write_unlock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
112 static inline void ct_read_lock_bh(unsigned key
)
114 read_lock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
117 static inline void ct_read_unlock_bh(unsigned key
)
119 read_unlock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
122 static inline void ct_write_lock_bh(unsigned key
)
124 write_lock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
127 static inline void ct_write_unlock_bh(unsigned key
)
129 write_unlock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
134 * Returns hash value for IPVS connection entry
136 static unsigned int ip_vs_conn_hashkey(int af
, unsigned proto
,
137 const union nf_inet_addr
*addr
,
140 #ifdef CONFIG_IP_VS_IPV6
142 return jhash_3words(jhash(addr
, 16, ip_vs_conn_rnd
),
143 (__force u32
)port
, proto
, ip_vs_conn_rnd
)
144 & ip_vs_conn_tab_mask
;
146 return jhash_3words((__force u32
)addr
->ip
, (__force u32
)port
, proto
,
148 & ip_vs_conn_tab_mask
;
153 * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port.
154 * returns bool success.
156 static inline int ip_vs_conn_hash(struct ip_vs_conn
*cp
)
161 /* Hash by protocol, client address and port */
162 hash
= ip_vs_conn_hashkey(cp
->af
, cp
->protocol
, &cp
->caddr
, cp
->cport
);
166 if (!(cp
->flags
& IP_VS_CONN_F_HASHED
)) {
167 list_add(&cp
->c_list
, &ip_vs_conn_tab
[hash
]);
168 cp
->flags
|= IP_VS_CONN_F_HASHED
;
169 atomic_inc(&cp
->refcnt
);
172 pr_err("%s(): request for already hashed, called from %pF\n",
173 __func__
, __builtin_return_address(0));
177 ct_write_unlock(hash
);
184 * UNhashes ip_vs_conn from ip_vs_conn_tab.
185 * returns bool success.
187 static inline int ip_vs_conn_unhash(struct ip_vs_conn
*cp
)
192 /* unhash it and decrease its reference counter */
193 hash
= ip_vs_conn_hashkey(cp
->af
, cp
->protocol
, &cp
->caddr
, cp
->cport
);
197 if (cp
->flags
& IP_VS_CONN_F_HASHED
) {
198 list_del(&cp
->c_list
);
199 cp
->flags
&= ~IP_VS_CONN_F_HASHED
;
200 atomic_dec(&cp
->refcnt
);
205 ct_write_unlock(hash
);
212 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
213 * Called for pkts coming from OUTside-to-INside.
214 * s_addr, s_port: pkt source address (foreign host)
215 * d_addr, d_port: pkt dest address (load balancer)
217 static inline struct ip_vs_conn
*__ip_vs_conn_in_get
218 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
219 const union nf_inet_addr
*d_addr
, __be16 d_port
)
222 struct ip_vs_conn
*cp
;
224 hash
= ip_vs_conn_hashkey(af
, protocol
, s_addr
, s_port
);
228 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
230 ip_vs_addr_equal(af
, s_addr
, &cp
->caddr
) &&
231 ip_vs_addr_equal(af
, d_addr
, &cp
->vaddr
) &&
232 s_port
== cp
->cport
&& d_port
== cp
->vport
&&
233 ((!s_port
) ^ (!(cp
->flags
& IP_VS_CONN_F_NO_CPORT
))) &&
234 protocol
== cp
->protocol
) {
236 atomic_inc(&cp
->refcnt
);
237 ct_read_unlock(hash
);
242 ct_read_unlock(hash
);
247 struct ip_vs_conn
*ip_vs_conn_in_get
248 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
249 const union nf_inet_addr
*d_addr
, __be16 d_port
)
251 struct ip_vs_conn
*cp
;
253 cp
= __ip_vs_conn_in_get(af
, protocol
, s_addr
, s_port
, d_addr
, d_port
);
254 if (!cp
&& atomic_read(&ip_vs_conn_no_cport_cnt
))
255 cp
= __ip_vs_conn_in_get(af
, protocol
, s_addr
, 0, d_addr
,
258 IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n",
259 ip_vs_proto_name(protocol
),
260 IP_VS_DBG_ADDR(af
, s_addr
), ntohs(s_port
),
261 IP_VS_DBG_ADDR(af
, d_addr
), ntohs(d_port
),
262 cp
? "hit" : "not hit");
267 /* Get reference to connection template */
268 struct ip_vs_conn
*ip_vs_ct_in_get
269 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
270 const union nf_inet_addr
*d_addr
, __be16 d_port
)
273 struct ip_vs_conn
*cp
;
275 hash
= ip_vs_conn_hashkey(af
, protocol
, s_addr
, s_port
);
279 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
281 ip_vs_addr_equal(af
, s_addr
, &cp
->caddr
) &&
282 /* protocol should only be IPPROTO_IP if
283 * d_addr is a fwmark */
284 ip_vs_addr_equal(protocol
== IPPROTO_IP
? AF_UNSPEC
: af
,
285 d_addr
, &cp
->vaddr
) &&
286 s_port
== cp
->cport
&& d_port
== cp
->vport
&&
287 cp
->flags
& IP_VS_CONN_F_TEMPLATE
&&
288 protocol
== cp
->protocol
) {
290 atomic_inc(&cp
->refcnt
);
297 ct_read_unlock(hash
);
299 IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
300 ip_vs_proto_name(protocol
),
301 IP_VS_DBG_ADDR(af
, s_addr
), ntohs(s_port
),
302 IP_VS_DBG_ADDR(af
, d_addr
), ntohs(d_port
),
303 cp
? "hit" : "not hit");
309 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
310 * Called for pkts coming from inside-to-OUTside.
311 * s_addr, s_port: pkt source address (inside host)
312 * d_addr, d_port: pkt dest address (foreign host)
314 struct ip_vs_conn
*ip_vs_conn_out_get
315 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
316 const union nf_inet_addr
*d_addr
, __be16 d_port
)
319 struct ip_vs_conn
*cp
, *ret
=NULL
;
322 * Check for "full" addressed entries
324 hash
= ip_vs_conn_hashkey(af
, protocol
, d_addr
, d_port
);
328 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
330 ip_vs_addr_equal(af
, d_addr
, &cp
->caddr
) &&
331 ip_vs_addr_equal(af
, s_addr
, &cp
->daddr
) &&
332 d_port
== cp
->cport
&& s_port
== cp
->dport
&&
333 protocol
== cp
->protocol
) {
335 atomic_inc(&cp
->refcnt
);
341 ct_read_unlock(hash
);
343 IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
344 ip_vs_proto_name(protocol
),
345 IP_VS_DBG_ADDR(af
, s_addr
), ntohs(s_port
),
346 IP_VS_DBG_ADDR(af
, d_addr
), ntohs(d_port
),
347 ret
? "hit" : "not hit");
354 * Put back the conn and restart its timer with its timeout
356 void ip_vs_conn_put(struct ip_vs_conn
*cp
)
358 /* reset it expire in its timeout */
359 mod_timer(&cp
->timer
, jiffies
+cp
->timeout
);
361 __ip_vs_conn_put(cp
);
366 * Fill a no_client_port connection with a client port number
368 void ip_vs_conn_fill_cport(struct ip_vs_conn
*cp
, __be16 cport
)
370 if (ip_vs_conn_unhash(cp
)) {
371 spin_lock(&cp
->lock
);
372 if (cp
->flags
& IP_VS_CONN_F_NO_CPORT
) {
373 atomic_dec(&ip_vs_conn_no_cport_cnt
);
374 cp
->flags
&= ~IP_VS_CONN_F_NO_CPORT
;
377 spin_unlock(&cp
->lock
);
379 /* hash on new dport */
386 * Bind a connection entry with the corresponding packet_xmit.
387 * Called by ip_vs_conn_new.
389 static inline void ip_vs_bind_xmit(struct ip_vs_conn
*cp
)
391 switch (IP_VS_FWD_METHOD(cp
)) {
392 case IP_VS_CONN_F_MASQ
:
393 cp
->packet_xmit
= ip_vs_nat_xmit
;
396 case IP_VS_CONN_F_TUNNEL
:
397 cp
->packet_xmit
= ip_vs_tunnel_xmit
;
400 case IP_VS_CONN_F_DROUTE
:
401 cp
->packet_xmit
= ip_vs_dr_xmit
;
404 case IP_VS_CONN_F_LOCALNODE
:
405 cp
->packet_xmit
= ip_vs_null_xmit
;
408 case IP_VS_CONN_F_BYPASS
:
409 cp
->packet_xmit
= ip_vs_bypass_xmit
;
414 #ifdef CONFIG_IP_VS_IPV6
415 static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn
*cp
)
417 switch (IP_VS_FWD_METHOD(cp
)) {
418 case IP_VS_CONN_F_MASQ
:
419 cp
->packet_xmit
= ip_vs_nat_xmit_v6
;
422 case IP_VS_CONN_F_TUNNEL
:
423 cp
->packet_xmit
= ip_vs_tunnel_xmit_v6
;
426 case IP_VS_CONN_F_DROUTE
:
427 cp
->packet_xmit
= ip_vs_dr_xmit_v6
;
430 case IP_VS_CONN_F_LOCALNODE
:
431 cp
->packet_xmit
= ip_vs_null_xmit
;
434 case IP_VS_CONN_F_BYPASS
:
435 cp
->packet_xmit
= ip_vs_bypass_xmit_v6
;
442 static inline int ip_vs_dest_totalconns(struct ip_vs_dest
*dest
)
444 return atomic_read(&dest
->activeconns
)
445 + atomic_read(&dest
->inactconns
);
449 * Bind a connection entry with a virtual service destination
450 * Called just after a new connection entry is created.
453 ip_vs_bind_dest(struct ip_vs_conn
*cp
, struct ip_vs_dest
*dest
)
455 /* if dest is NULL, then return directly */
459 /* Increase the refcnt counter of the dest */
460 atomic_inc(&dest
->refcnt
);
462 /* Bind with the destination and its corresponding transmitter */
463 if ((cp
->flags
& IP_VS_CONN_F_SYNC
) &&
464 (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)))
465 /* if the connection is not template and is created
466 * by sync, preserve the activity flag.
468 cp
->flags
|= atomic_read(&dest
->conn_flags
) &
469 (~IP_VS_CONN_F_INACTIVE
);
471 cp
->flags
|= atomic_read(&dest
->conn_flags
);
474 IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
475 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
477 ip_vs_proto_name(cp
->protocol
),
478 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
), ntohs(cp
->cport
),
479 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
), ntohs(cp
->vport
),
480 IP_VS_DBG_ADDR(cp
->af
, &cp
->daddr
), ntohs(cp
->dport
),
481 ip_vs_fwd_tag(cp
), cp
->state
,
482 cp
->flags
, atomic_read(&cp
->refcnt
),
483 atomic_read(&dest
->refcnt
));
485 /* Update the connection counters */
486 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)) {
487 /* It is a normal connection, so increase the inactive
488 connection counter because it is in TCP SYNRECV
489 state (inactive) or other protocol inacive state */
490 if ((cp
->flags
& IP_VS_CONN_F_SYNC
) &&
491 (!(cp
->flags
& IP_VS_CONN_F_INACTIVE
)))
492 atomic_inc(&dest
->activeconns
);
494 atomic_inc(&dest
->inactconns
);
496 /* It is a persistent connection/template, so increase
497 the peristent connection counter */
498 atomic_inc(&dest
->persistconns
);
501 if (dest
->u_threshold
!= 0 &&
502 ip_vs_dest_totalconns(dest
) >= dest
->u_threshold
)
503 dest
->flags
|= IP_VS_DEST_F_OVERLOAD
;
508 * Check if there is a destination for the connection, if so
509 * bind the connection to the destination.
511 struct ip_vs_dest
*ip_vs_try_bind_dest(struct ip_vs_conn
*cp
)
513 struct ip_vs_dest
*dest
;
515 if ((cp
) && (!cp
->dest
)) {
516 dest
= ip_vs_find_dest(cp
->af
, &cp
->daddr
, cp
->dport
,
517 &cp
->vaddr
, cp
->vport
,
519 ip_vs_bind_dest(cp
, dest
);
527 * Unbind a connection entry with its VS destination
528 * Called by the ip_vs_conn_expire function.
530 static inline void ip_vs_unbind_dest(struct ip_vs_conn
*cp
)
532 struct ip_vs_dest
*dest
= cp
->dest
;
537 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
538 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
540 ip_vs_proto_name(cp
->protocol
),
541 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
), ntohs(cp
->cport
),
542 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
), ntohs(cp
->vport
),
543 IP_VS_DBG_ADDR(cp
->af
, &cp
->daddr
), ntohs(cp
->dport
),
544 ip_vs_fwd_tag(cp
), cp
->state
,
545 cp
->flags
, atomic_read(&cp
->refcnt
),
546 atomic_read(&dest
->refcnt
));
548 /* Update the connection counters */
549 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)) {
550 /* It is a normal connection, so decrease the inactconns
551 or activeconns counter */
552 if (cp
->flags
& IP_VS_CONN_F_INACTIVE
) {
553 atomic_dec(&dest
->inactconns
);
555 atomic_dec(&dest
->activeconns
);
558 /* It is a persistent connection/template, so decrease
559 the peristent connection counter */
560 atomic_dec(&dest
->persistconns
);
563 if (dest
->l_threshold
!= 0) {
564 if (ip_vs_dest_totalconns(dest
) < dest
->l_threshold
)
565 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
566 } else if (dest
->u_threshold
!= 0) {
567 if (ip_vs_dest_totalconns(dest
) * 4 < dest
->u_threshold
* 3)
568 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
570 if (dest
->flags
& IP_VS_DEST_F_OVERLOAD
)
571 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
575 * Simply decrease the refcnt of the dest, because the
576 * dest will be either in service's destination list
579 atomic_dec(&dest
->refcnt
);
584 * Checking if the destination of a connection template is available.
585 * If available, return 1, otherwise invalidate this connection
586 * template and return 0.
588 int ip_vs_check_template(struct ip_vs_conn
*ct
)
590 struct ip_vs_dest
*dest
= ct
->dest
;
593 * Checking the dest server status.
595 if ((dest
== NULL
) ||
596 !(dest
->flags
& IP_VS_DEST_F_AVAILABLE
) ||
597 (sysctl_ip_vs_expire_quiescent_template
&&
598 (atomic_read(&dest
->weight
) == 0))) {
599 IP_VS_DBG_BUF(9, "check_template: dest not available for "
600 "protocol %s s:%s:%d v:%s:%d "
602 ip_vs_proto_name(ct
->protocol
),
603 IP_VS_DBG_ADDR(ct
->af
, &ct
->caddr
),
605 IP_VS_DBG_ADDR(ct
->af
, &ct
->vaddr
),
607 IP_VS_DBG_ADDR(ct
->af
, &ct
->daddr
),
611 * Invalidate the connection template
613 if (ct
->vport
!= htons(0xffff)) {
614 if (ip_vs_conn_unhash(ct
)) {
615 ct
->dport
= htons(0xffff);
616 ct
->vport
= htons(0xffff);
623 * Simply decrease the refcnt of the template,
624 * don't restart its timer.
626 atomic_dec(&ct
->refcnt
);
632 static void ip_vs_conn_expire(unsigned long data
)
634 struct ip_vs_conn
*cp
= (struct ip_vs_conn
*)data
;
641 atomic_inc(&cp
->refcnt
);
644 * do I control anybody?
646 if (atomic_read(&cp
->n_control
))
650 * unhash it if it is hashed in the conn table
652 if (!ip_vs_conn_unhash(cp
))
656 * refcnt==1 implies I'm the only one referrer
658 if (likely(atomic_read(&cp
->refcnt
) == 1)) {
659 /* delete the timer if it is activated by other users */
660 if (timer_pending(&cp
->timer
))
661 del_timer(&cp
->timer
);
663 /* does anybody control me? */
665 ip_vs_control_del(cp
);
667 if (unlikely(cp
->app
!= NULL
))
668 ip_vs_unbind_app(cp
);
669 ip_vs_unbind_dest(cp
);
670 if (cp
->flags
& IP_VS_CONN_F_NO_CPORT
)
671 atomic_dec(&ip_vs_conn_no_cport_cnt
);
672 atomic_dec(&ip_vs_conn_count
);
674 kmem_cache_free(ip_vs_conn_cachep
, cp
);
678 /* hash it back to the table */
682 IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
683 atomic_read(&cp
->refcnt
)-1,
684 atomic_read(&cp
->n_control
));
690 void ip_vs_conn_expire_now(struct ip_vs_conn
*cp
)
692 if (del_timer(&cp
->timer
))
693 mod_timer(&cp
->timer
, jiffies
);
698 * Create a new connection entry and hash it into the ip_vs_conn_tab
701 ip_vs_conn_new(int af
, int proto
, const union nf_inet_addr
*caddr
, __be16 cport
,
702 const union nf_inet_addr
*vaddr
, __be16 vport
,
703 const union nf_inet_addr
*daddr
, __be16 dport
, unsigned flags
,
704 struct ip_vs_dest
*dest
)
706 struct ip_vs_conn
*cp
;
707 struct ip_vs_protocol
*pp
= ip_vs_proto_get(proto
);
709 cp
= kmem_cache_zalloc(ip_vs_conn_cachep
, GFP_ATOMIC
);
711 IP_VS_ERR_RL("%s(): no memory\n", __func__
);
715 INIT_LIST_HEAD(&cp
->c_list
);
716 setup_timer(&cp
->timer
, ip_vs_conn_expire
, (unsigned long)cp
);
718 cp
->protocol
= proto
;
719 ip_vs_addr_copy(af
, &cp
->caddr
, caddr
);
721 ip_vs_addr_copy(af
, &cp
->vaddr
, vaddr
);
723 /* proto should only be IPPROTO_IP if d_addr is a fwmark */
724 ip_vs_addr_copy(proto
== IPPROTO_IP
? AF_UNSPEC
: af
,
728 spin_lock_init(&cp
->lock
);
731 * Set the entry is referenced by the current thread before hashing
732 * it in the table, so that other thread run ip_vs_random_dropentry
733 * but cannot drop this entry.
735 atomic_set(&cp
->refcnt
, 1);
737 atomic_set(&cp
->n_control
, 0);
738 atomic_set(&cp
->in_pkts
, 0);
740 atomic_inc(&ip_vs_conn_count
);
741 if (flags
& IP_VS_CONN_F_NO_CPORT
)
742 atomic_inc(&ip_vs_conn_no_cport_cnt
);
744 /* Bind the connection with a destination server */
745 ip_vs_bind_dest(cp
, dest
);
747 /* Set its state and timeout */
751 /* Bind its packet transmitter */
752 #ifdef CONFIG_IP_VS_IPV6
754 ip_vs_bind_xmit_v6(cp
);
759 if (unlikely(pp
&& atomic_read(&pp
->appcnt
)))
760 ip_vs_bind_app(cp
, pp
);
762 /* Hash it in the ip_vs_conn_tab finally */
770 * /proc/net/ip_vs_conn entries
772 #ifdef CONFIG_PROC_FS
774 static void *ip_vs_conn_array(struct seq_file
*seq
, loff_t pos
)
777 struct ip_vs_conn
*cp
;
779 for (idx
= 0; idx
< ip_vs_conn_tab_size
; idx
++) {
780 ct_read_lock_bh(idx
);
781 list_for_each_entry(cp
, &ip_vs_conn_tab
[idx
], c_list
) {
783 seq
->private = &ip_vs_conn_tab
[idx
];
787 ct_read_unlock_bh(idx
);
793 static void *ip_vs_conn_seq_start(struct seq_file
*seq
, loff_t
*pos
)
796 return *pos
? ip_vs_conn_array(seq
, *pos
- 1) :SEQ_START_TOKEN
;
799 static void *ip_vs_conn_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
801 struct ip_vs_conn
*cp
= v
;
802 struct list_head
*e
, *l
= seq
->private;
806 if (v
== SEQ_START_TOKEN
)
807 return ip_vs_conn_array(seq
, 0);
809 /* more on same hash chain? */
810 if ((e
= cp
->c_list
.next
) != l
)
811 return list_entry(e
, struct ip_vs_conn
, c_list
);
813 idx
= l
- ip_vs_conn_tab
;
814 ct_read_unlock_bh(idx
);
816 while (++idx
< ip_vs_conn_tab_size
) {
817 ct_read_lock_bh(idx
);
818 list_for_each_entry(cp
, &ip_vs_conn_tab
[idx
], c_list
) {
819 seq
->private = &ip_vs_conn_tab
[idx
];
822 ct_read_unlock_bh(idx
);
828 static void ip_vs_conn_seq_stop(struct seq_file
*seq
, void *v
)
830 struct list_head
*l
= seq
->private;
833 ct_read_unlock_bh(l
- ip_vs_conn_tab
);
836 static int ip_vs_conn_seq_show(struct seq_file
*seq
, void *v
)
839 if (v
== SEQ_START_TOKEN
)
841 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires\n");
843 const struct ip_vs_conn
*cp
= v
;
845 #ifdef CONFIG_IP_VS_IPV6
846 if (cp
->af
== AF_INET6
)
847 seq_printf(seq
, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %7lu\n",
848 ip_vs_proto_name(cp
->protocol
),
849 &cp
->caddr
.in6
, ntohs(cp
->cport
),
850 &cp
->vaddr
.in6
, ntohs(cp
->vport
),
851 &cp
->daddr
.in6
, ntohs(cp
->dport
),
852 ip_vs_state_name(cp
->protocol
, cp
->state
),
853 (cp
->timer
.expires
-jiffies
)/HZ
);
857 "%-3s %08X %04X %08X %04X"
858 " %08X %04X %-11s %7lu\n",
859 ip_vs_proto_name(cp
->protocol
),
860 ntohl(cp
->caddr
.ip
), ntohs(cp
->cport
),
861 ntohl(cp
->vaddr
.ip
), ntohs(cp
->vport
),
862 ntohl(cp
->daddr
.ip
), ntohs(cp
->dport
),
863 ip_vs_state_name(cp
->protocol
, cp
->state
),
864 (cp
->timer
.expires
-jiffies
)/HZ
);
869 static const struct seq_operations ip_vs_conn_seq_ops
= {
870 .start
= ip_vs_conn_seq_start
,
871 .next
= ip_vs_conn_seq_next
,
872 .stop
= ip_vs_conn_seq_stop
,
873 .show
= ip_vs_conn_seq_show
,
876 static int ip_vs_conn_open(struct inode
*inode
, struct file
*file
)
878 return seq_open(file
, &ip_vs_conn_seq_ops
);
881 static const struct file_operations ip_vs_conn_fops
= {
882 .owner
= THIS_MODULE
,
883 .open
= ip_vs_conn_open
,
886 .release
= seq_release
,
889 static const char *ip_vs_origin_name(unsigned flags
)
891 if (flags
& IP_VS_CONN_F_SYNC
)
897 static int ip_vs_conn_sync_seq_show(struct seq_file
*seq
, void *v
)
900 if (v
== SEQ_START_TOKEN
)
902 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
904 const struct ip_vs_conn
*cp
= v
;
906 #ifdef CONFIG_IP_VS_IPV6
907 if (cp
->af
== AF_INET6
)
908 seq_printf(seq
, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
909 ip_vs_proto_name(cp
->protocol
),
910 &cp
->caddr
.in6
, ntohs(cp
->cport
),
911 &cp
->vaddr
.in6
, ntohs(cp
->vport
),
912 &cp
->daddr
.in6
, ntohs(cp
->dport
),
913 ip_vs_state_name(cp
->protocol
, cp
->state
),
914 ip_vs_origin_name(cp
->flags
),
915 (cp
->timer
.expires
-jiffies
)/HZ
);
919 "%-3s %08X %04X %08X %04X "
920 "%08X %04X %-11s %-6s %7lu\n",
921 ip_vs_proto_name(cp
->protocol
),
922 ntohl(cp
->caddr
.ip
), ntohs(cp
->cport
),
923 ntohl(cp
->vaddr
.ip
), ntohs(cp
->vport
),
924 ntohl(cp
->daddr
.ip
), ntohs(cp
->dport
),
925 ip_vs_state_name(cp
->protocol
, cp
->state
),
926 ip_vs_origin_name(cp
->flags
),
927 (cp
->timer
.expires
-jiffies
)/HZ
);
932 static const struct seq_operations ip_vs_conn_sync_seq_ops
= {
933 .start
= ip_vs_conn_seq_start
,
934 .next
= ip_vs_conn_seq_next
,
935 .stop
= ip_vs_conn_seq_stop
,
936 .show
= ip_vs_conn_sync_seq_show
,
939 static int ip_vs_conn_sync_open(struct inode
*inode
, struct file
*file
)
941 return seq_open(file
, &ip_vs_conn_sync_seq_ops
);
944 static const struct file_operations ip_vs_conn_sync_fops
= {
945 .owner
= THIS_MODULE
,
946 .open
= ip_vs_conn_sync_open
,
949 .release
= seq_release
,
956 * Randomly drop connection entries before running out of memory
958 static inline int todrop_entry(struct ip_vs_conn
*cp
)
961 * The drop rate array needs tuning for real environments.
962 * Called from timer bh only => no locking
964 static const char todrop_rate
[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
965 static char todrop_counter
[9] = {0};
968 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
969 This will leave enough time for normal connection to get
971 if (time_before(cp
->timeout
+ jiffies
, cp
->timer
.expires
+ 60*HZ
))
974 /* Don't drop the entry if its number of incoming packets is not
976 i
= atomic_read(&cp
->in_pkts
);
977 if (i
> 8 || i
< 0) return 0;
979 if (!todrop_rate
[i
]) return 0;
980 if (--todrop_counter
[i
] > 0) return 0;
982 todrop_counter
[i
] = todrop_rate
[i
];
986 /* Called from keventd and must protect itself from softirqs */
987 void ip_vs_random_dropentry(void)
990 struct ip_vs_conn
*cp
;
993 * Randomly scan 1/32 of the whole table every second
995 for (idx
= 0; idx
< (ip_vs_conn_tab_size
>>5); idx
++) {
996 unsigned hash
= net_random() & ip_vs_conn_tab_mask
;
999 * Lock is actually needed in this loop.
1001 ct_write_lock_bh(hash
);
1003 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
1004 if (cp
->flags
& IP_VS_CONN_F_TEMPLATE
)
1005 /* connection template */
1008 if (cp
->protocol
== IPPROTO_TCP
) {
1010 case IP_VS_TCP_S_SYN_RECV
:
1011 case IP_VS_TCP_S_SYNACK
:
1014 case IP_VS_TCP_S_ESTABLISHED
:
1015 if (todrop_entry(cp
))
1023 if (!todrop_entry(cp
))
1027 IP_VS_DBG(4, "del connection\n");
1028 ip_vs_conn_expire_now(cp
);
1030 IP_VS_DBG(4, "del conn template\n");
1031 ip_vs_conn_expire_now(cp
->control
);
1034 ct_write_unlock_bh(hash
);
1040 * Flush all the connection entries in the ip_vs_conn_tab
1042 static void ip_vs_conn_flush(void)
1045 struct ip_vs_conn
*cp
;
1048 for (idx
= 0; idx
< ip_vs_conn_tab_size
; idx
++) {
1050 * Lock is actually needed in this loop.
1052 ct_write_lock_bh(idx
);
1054 list_for_each_entry(cp
, &ip_vs_conn_tab
[idx
], c_list
) {
1056 IP_VS_DBG(4, "del connection\n");
1057 ip_vs_conn_expire_now(cp
);
1059 IP_VS_DBG(4, "del conn template\n");
1060 ip_vs_conn_expire_now(cp
->control
);
1063 ct_write_unlock_bh(idx
);
1066 /* the counter may be not NULL, because maybe some conn entries
1067 are run by slow timer handler or unhashed but still referred */
1068 if (atomic_read(&ip_vs_conn_count
) != 0) {
1075 int __init
ip_vs_conn_init(void)
1079 /* Compute size and mask */
1080 ip_vs_conn_tab_size
= 1 << ip_vs_conn_tab_bits
;
1081 ip_vs_conn_tab_mask
= ip_vs_conn_tab_size
- 1;
1084 * Allocate the connection hash table and initialize its list heads
1086 ip_vs_conn_tab
= vmalloc(ip_vs_conn_tab_size
*
1087 sizeof(struct list_head
));
1088 if (!ip_vs_conn_tab
)
1091 /* Allocate ip_vs_conn slab cache */
1092 ip_vs_conn_cachep
= kmem_cache_create("ip_vs_conn",
1093 sizeof(struct ip_vs_conn
), 0,
1094 SLAB_HWCACHE_ALIGN
, NULL
);
1095 if (!ip_vs_conn_cachep
) {
1096 vfree(ip_vs_conn_tab
);
1100 pr_info("Connection hash table configured "
1101 "(size=%d, memory=%ldKbytes)\n",
1102 ip_vs_conn_tab_size
,
1103 (long)(ip_vs_conn_tab_size
*sizeof(struct list_head
))/1024);
1104 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1105 sizeof(struct ip_vs_conn
));
1107 for (idx
= 0; idx
< ip_vs_conn_tab_size
; idx
++) {
1108 INIT_LIST_HEAD(&ip_vs_conn_tab
[idx
]);
1111 for (idx
= 0; idx
< CT_LOCKARRAY_SIZE
; idx
++) {
1112 rwlock_init(&__ip_vs_conntbl_lock_array
[idx
].l
);
1115 proc_net_fops_create(&init_net
, "ip_vs_conn", 0, &ip_vs_conn_fops
);
1116 proc_net_fops_create(&init_net
, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops
);
1118 /* calculate the random value for connection hash */
1119 get_random_bytes(&ip_vs_conn_rnd
, sizeof(ip_vs_conn_rnd
));
1125 void ip_vs_conn_cleanup(void)
1127 /* flush all the connection entries first */
1130 /* Release the empty cache */
1131 kmem_cache_destroy(ip_vs_conn_cachep
);
1132 proc_net_remove(&init_net
, "ip_vs_conn");
1133 proc_net_remove(&init_net
, "ip_vs_conn_sync");
1134 vfree(ip_vs_conn_tab
);