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/seq_file.h>
36 #include <linux/jhash.h>
37 #include <linux/random.h>
39 #include <net/net_namespace.h>
40 #include <net/ip_vs.h>
44 * Connection hash table: for input and output packets lookups of IPVS
46 static struct list_head
*ip_vs_conn_tab
;
48 /* SLAB cache for IPVS connections */
49 static struct kmem_cache
*ip_vs_conn_cachep __read_mostly
;
51 /* counter for current IPVS connections */
52 static atomic_t ip_vs_conn_count
= ATOMIC_INIT(0);
54 /* counter for no client port connections */
55 static atomic_t ip_vs_conn_no_cport_cnt
= ATOMIC_INIT(0);
57 /* random value for IPVS connection hash */
58 static unsigned int ip_vs_conn_rnd
;
61 * Fine locking granularity for big connection hash table
63 #define CT_LOCKARRAY_BITS 4
64 #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
65 #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
67 struct ip_vs_aligned_lock
70 } __attribute__((__aligned__(SMP_CACHE_BYTES
)));
72 /* lock array for conn table */
73 static struct ip_vs_aligned_lock
74 __ip_vs_conntbl_lock_array
[CT_LOCKARRAY_SIZE
] __cacheline_aligned
;
76 static inline void ct_read_lock(unsigned key
)
78 read_lock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
81 static inline void ct_read_unlock(unsigned key
)
83 read_unlock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
86 static inline void ct_write_lock(unsigned key
)
88 write_lock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
91 static inline void ct_write_unlock(unsigned key
)
93 write_unlock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
96 static inline void ct_read_lock_bh(unsigned key
)
98 read_lock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
101 static inline void ct_read_unlock_bh(unsigned key
)
103 read_unlock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
106 static inline void ct_write_lock_bh(unsigned key
)
108 write_lock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
111 static inline void ct_write_unlock_bh(unsigned key
)
113 write_unlock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
118 * Returns hash value for IPVS connection entry
120 static unsigned int ip_vs_conn_hashkey(int af
, unsigned proto
,
121 const union nf_inet_addr
*addr
,
124 #ifdef CONFIG_IP_VS_IPV6
126 return jhash_3words(jhash(addr
, 16, ip_vs_conn_rnd
),
127 (__force u32
)port
, proto
, ip_vs_conn_rnd
)
128 & IP_VS_CONN_TAB_MASK
;
130 return jhash_3words((__force u32
)addr
->ip
, (__force u32
)port
, proto
,
132 & IP_VS_CONN_TAB_MASK
;
137 * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port.
138 * returns bool success.
140 static inline int ip_vs_conn_hash(struct ip_vs_conn
*cp
)
145 /* Hash by protocol, client address and port */
146 hash
= ip_vs_conn_hashkey(cp
->af
, cp
->protocol
, &cp
->caddr
, cp
->cport
);
150 if (!(cp
->flags
& IP_VS_CONN_F_HASHED
)) {
151 list_add(&cp
->c_list
, &ip_vs_conn_tab
[hash
]);
152 cp
->flags
|= IP_VS_CONN_F_HASHED
;
153 atomic_inc(&cp
->refcnt
);
156 pr_err("%s(): request for already hashed, called from %pF\n",
157 __func__
, __builtin_return_address(0));
161 ct_write_unlock(hash
);
168 * UNhashes ip_vs_conn from ip_vs_conn_tab.
169 * returns bool success.
171 static inline int ip_vs_conn_unhash(struct ip_vs_conn
*cp
)
176 /* unhash it and decrease its reference counter */
177 hash
= ip_vs_conn_hashkey(cp
->af
, cp
->protocol
, &cp
->caddr
, cp
->cport
);
181 if (cp
->flags
& IP_VS_CONN_F_HASHED
) {
182 list_del(&cp
->c_list
);
183 cp
->flags
&= ~IP_VS_CONN_F_HASHED
;
184 atomic_dec(&cp
->refcnt
);
189 ct_write_unlock(hash
);
196 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
197 * Called for pkts coming from OUTside-to-INside.
198 * s_addr, s_port: pkt source address (foreign host)
199 * d_addr, d_port: pkt dest address (load balancer)
201 static inline struct ip_vs_conn
*__ip_vs_conn_in_get
202 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
203 const union nf_inet_addr
*d_addr
, __be16 d_port
)
206 struct ip_vs_conn
*cp
;
208 hash
= ip_vs_conn_hashkey(af
, protocol
, s_addr
, s_port
);
212 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
214 ip_vs_addr_equal(af
, s_addr
, &cp
->caddr
) &&
215 ip_vs_addr_equal(af
, d_addr
, &cp
->vaddr
) &&
216 s_port
== cp
->cport
&& d_port
== cp
->vport
&&
217 ((!s_port
) ^ (!(cp
->flags
& IP_VS_CONN_F_NO_CPORT
))) &&
218 protocol
== cp
->protocol
) {
220 atomic_inc(&cp
->refcnt
);
221 ct_read_unlock(hash
);
226 ct_read_unlock(hash
);
231 struct ip_vs_conn
*ip_vs_conn_in_get
232 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
233 const union nf_inet_addr
*d_addr
, __be16 d_port
)
235 struct ip_vs_conn
*cp
;
237 cp
= __ip_vs_conn_in_get(af
, protocol
, s_addr
, s_port
, d_addr
, d_port
);
238 if (!cp
&& atomic_read(&ip_vs_conn_no_cport_cnt
))
239 cp
= __ip_vs_conn_in_get(af
, protocol
, s_addr
, 0, d_addr
,
242 IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n",
243 ip_vs_proto_name(protocol
),
244 IP_VS_DBG_ADDR(af
, s_addr
), ntohs(s_port
),
245 IP_VS_DBG_ADDR(af
, d_addr
), ntohs(d_port
),
246 cp
? "hit" : "not hit");
251 /* Get reference to connection template */
252 struct ip_vs_conn
*ip_vs_ct_in_get
253 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
254 const union nf_inet_addr
*d_addr
, __be16 d_port
)
257 struct ip_vs_conn
*cp
;
259 hash
= ip_vs_conn_hashkey(af
, protocol
, s_addr
, s_port
);
263 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
265 ip_vs_addr_equal(af
, s_addr
, &cp
->caddr
) &&
266 /* protocol should only be IPPROTO_IP if
267 * d_addr is a fwmark */
268 ip_vs_addr_equal(protocol
== IPPROTO_IP
? AF_UNSPEC
: af
,
269 d_addr
, &cp
->vaddr
) &&
270 s_port
== cp
->cport
&& d_port
== cp
->vport
&&
271 cp
->flags
& IP_VS_CONN_F_TEMPLATE
&&
272 protocol
== cp
->protocol
) {
274 atomic_inc(&cp
->refcnt
);
281 ct_read_unlock(hash
);
283 IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
284 ip_vs_proto_name(protocol
),
285 IP_VS_DBG_ADDR(af
, s_addr
), ntohs(s_port
),
286 IP_VS_DBG_ADDR(af
, d_addr
), ntohs(d_port
),
287 cp
? "hit" : "not hit");
293 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
294 * Called for pkts coming from inside-to-OUTside.
295 * s_addr, s_port: pkt source address (inside host)
296 * d_addr, d_port: pkt dest address (foreign host)
298 struct ip_vs_conn
*ip_vs_conn_out_get
299 (int af
, int protocol
, const union nf_inet_addr
*s_addr
, __be16 s_port
,
300 const union nf_inet_addr
*d_addr
, __be16 d_port
)
303 struct ip_vs_conn
*cp
, *ret
=NULL
;
306 * Check for "full" addressed entries
308 hash
= ip_vs_conn_hashkey(af
, protocol
, d_addr
, d_port
);
312 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
314 ip_vs_addr_equal(af
, d_addr
, &cp
->caddr
) &&
315 ip_vs_addr_equal(af
, s_addr
, &cp
->daddr
) &&
316 d_port
== cp
->cport
&& s_port
== cp
->dport
&&
317 protocol
== cp
->protocol
) {
319 atomic_inc(&cp
->refcnt
);
325 ct_read_unlock(hash
);
327 IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
328 ip_vs_proto_name(protocol
),
329 IP_VS_DBG_ADDR(af
, s_addr
), ntohs(s_port
),
330 IP_VS_DBG_ADDR(af
, d_addr
), ntohs(d_port
),
331 ret
? "hit" : "not hit");
338 * Put back the conn and restart its timer with its timeout
340 void ip_vs_conn_put(struct ip_vs_conn
*cp
)
342 /* reset it expire in its timeout */
343 mod_timer(&cp
->timer
, jiffies
+cp
->timeout
);
345 __ip_vs_conn_put(cp
);
350 * Fill a no_client_port connection with a client port number
352 void ip_vs_conn_fill_cport(struct ip_vs_conn
*cp
, __be16 cport
)
354 if (ip_vs_conn_unhash(cp
)) {
355 spin_lock(&cp
->lock
);
356 if (cp
->flags
& IP_VS_CONN_F_NO_CPORT
) {
357 atomic_dec(&ip_vs_conn_no_cport_cnt
);
358 cp
->flags
&= ~IP_VS_CONN_F_NO_CPORT
;
361 spin_unlock(&cp
->lock
);
363 /* hash on new dport */
370 * Bind a connection entry with the corresponding packet_xmit.
371 * Called by ip_vs_conn_new.
373 static inline void ip_vs_bind_xmit(struct ip_vs_conn
*cp
)
375 switch (IP_VS_FWD_METHOD(cp
)) {
376 case IP_VS_CONN_F_MASQ
:
377 cp
->packet_xmit
= ip_vs_nat_xmit
;
380 case IP_VS_CONN_F_TUNNEL
:
381 cp
->packet_xmit
= ip_vs_tunnel_xmit
;
384 case IP_VS_CONN_F_DROUTE
:
385 cp
->packet_xmit
= ip_vs_dr_xmit
;
388 case IP_VS_CONN_F_LOCALNODE
:
389 cp
->packet_xmit
= ip_vs_null_xmit
;
392 case IP_VS_CONN_F_BYPASS
:
393 cp
->packet_xmit
= ip_vs_bypass_xmit
;
398 #ifdef CONFIG_IP_VS_IPV6
399 static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn
*cp
)
401 switch (IP_VS_FWD_METHOD(cp
)) {
402 case IP_VS_CONN_F_MASQ
:
403 cp
->packet_xmit
= ip_vs_nat_xmit_v6
;
406 case IP_VS_CONN_F_TUNNEL
:
407 cp
->packet_xmit
= ip_vs_tunnel_xmit_v6
;
410 case IP_VS_CONN_F_DROUTE
:
411 cp
->packet_xmit
= ip_vs_dr_xmit_v6
;
414 case IP_VS_CONN_F_LOCALNODE
:
415 cp
->packet_xmit
= ip_vs_null_xmit
;
418 case IP_VS_CONN_F_BYPASS
:
419 cp
->packet_xmit
= ip_vs_bypass_xmit_v6
;
426 static inline int ip_vs_dest_totalconns(struct ip_vs_dest
*dest
)
428 return atomic_read(&dest
->activeconns
)
429 + atomic_read(&dest
->inactconns
);
433 * Bind a connection entry with a virtual service destination
434 * Called just after a new connection entry is created.
437 ip_vs_bind_dest(struct ip_vs_conn
*cp
, struct ip_vs_dest
*dest
)
439 /* if dest is NULL, then return directly */
443 /* Increase the refcnt counter of the dest */
444 atomic_inc(&dest
->refcnt
);
446 /* Bind with the destination and its corresponding transmitter */
447 if ((cp
->flags
& IP_VS_CONN_F_SYNC
) &&
448 (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)))
449 /* if the connection is not template and is created
450 * by sync, preserve the activity flag.
452 cp
->flags
|= atomic_read(&dest
->conn_flags
) &
453 (~IP_VS_CONN_F_INACTIVE
);
455 cp
->flags
|= atomic_read(&dest
->conn_flags
);
458 IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
459 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
461 ip_vs_proto_name(cp
->protocol
),
462 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
), ntohs(cp
->cport
),
463 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
), ntohs(cp
->vport
),
464 IP_VS_DBG_ADDR(cp
->af
, &cp
->daddr
), ntohs(cp
->dport
),
465 ip_vs_fwd_tag(cp
), cp
->state
,
466 cp
->flags
, atomic_read(&cp
->refcnt
),
467 atomic_read(&dest
->refcnt
));
469 /* Update the connection counters */
470 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)) {
471 /* It is a normal connection, so increase the inactive
472 connection counter because it is in TCP SYNRECV
473 state (inactive) or other protocol inacive state */
474 if ((cp
->flags
& IP_VS_CONN_F_SYNC
) &&
475 (!(cp
->flags
& IP_VS_CONN_F_INACTIVE
)))
476 atomic_inc(&dest
->activeconns
);
478 atomic_inc(&dest
->inactconns
);
480 /* It is a persistent connection/template, so increase
481 the peristent connection counter */
482 atomic_inc(&dest
->persistconns
);
485 if (dest
->u_threshold
!= 0 &&
486 ip_vs_dest_totalconns(dest
) >= dest
->u_threshold
)
487 dest
->flags
|= IP_VS_DEST_F_OVERLOAD
;
492 * Check if there is a destination for the connection, if so
493 * bind the connection to the destination.
495 struct ip_vs_dest
*ip_vs_try_bind_dest(struct ip_vs_conn
*cp
)
497 struct ip_vs_dest
*dest
;
499 if ((cp
) && (!cp
->dest
)) {
500 dest
= ip_vs_find_dest(cp
->af
, &cp
->daddr
, cp
->dport
,
501 &cp
->vaddr
, cp
->vport
,
503 ip_vs_bind_dest(cp
, dest
);
511 * Unbind a connection entry with its VS destination
512 * Called by the ip_vs_conn_expire function.
514 static inline void ip_vs_unbind_dest(struct ip_vs_conn
*cp
)
516 struct ip_vs_dest
*dest
= cp
->dest
;
521 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
522 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
524 ip_vs_proto_name(cp
->protocol
),
525 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
), ntohs(cp
->cport
),
526 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
), ntohs(cp
->vport
),
527 IP_VS_DBG_ADDR(cp
->af
, &cp
->daddr
), ntohs(cp
->dport
),
528 ip_vs_fwd_tag(cp
), cp
->state
,
529 cp
->flags
, atomic_read(&cp
->refcnt
),
530 atomic_read(&dest
->refcnt
));
532 /* Update the connection counters */
533 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)) {
534 /* It is a normal connection, so decrease the inactconns
535 or activeconns counter */
536 if (cp
->flags
& IP_VS_CONN_F_INACTIVE
) {
537 atomic_dec(&dest
->inactconns
);
539 atomic_dec(&dest
->activeconns
);
542 /* It is a persistent connection/template, so decrease
543 the peristent connection counter */
544 atomic_dec(&dest
->persistconns
);
547 if (dest
->l_threshold
!= 0) {
548 if (ip_vs_dest_totalconns(dest
) < dest
->l_threshold
)
549 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
550 } else if (dest
->u_threshold
!= 0) {
551 if (ip_vs_dest_totalconns(dest
) * 4 < dest
->u_threshold
* 3)
552 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
554 if (dest
->flags
& IP_VS_DEST_F_OVERLOAD
)
555 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
559 * Simply decrease the refcnt of the dest, because the
560 * dest will be either in service's destination list
563 atomic_dec(&dest
->refcnt
);
568 * Checking if the destination of a connection template is available.
569 * If available, return 1, otherwise invalidate this connection
570 * template and return 0.
572 int ip_vs_check_template(struct ip_vs_conn
*ct
)
574 struct ip_vs_dest
*dest
= ct
->dest
;
577 * Checking the dest server status.
579 if ((dest
== NULL
) ||
580 !(dest
->flags
& IP_VS_DEST_F_AVAILABLE
) ||
581 (sysctl_ip_vs_expire_quiescent_template
&&
582 (atomic_read(&dest
->weight
) == 0))) {
583 IP_VS_DBG_BUF(9, "check_template: dest not available for "
584 "protocol %s s:%s:%d v:%s:%d "
586 ip_vs_proto_name(ct
->protocol
),
587 IP_VS_DBG_ADDR(ct
->af
, &ct
->caddr
),
589 IP_VS_DBG_ADDR(ct
->af
, &ct
->vaddr
),
591 IP_VS_DBG_ADDR(ct
->af
, &ct
->daddr
),
595 * Invalidate the connection template
597 if (ct
->vport
!= htons(0xffff)) {
598 if (ip_vs_conn_unhash(ct
)) {
599 ct
->dport
= htons(0xffff);
600 ct
->vport
= htons(0xffff);
607 * Simply decrease the refcnt of the template,
608 * don't restart its timer.
610 atomic_dec(&ct
->refcnt
);
616 static void ip_vs_conn_expire(unsigned long data
)
618 struct ip_vs_conn
*cp
= (struct ip_vs_conn
*)data
;
625 atomic_inc(&cp
->refcnt
);
628 * do I control anybody?
630 if (atomic_read(&cp
->n_control
))
634 * unhash it if it is hashed in the conn table
636 if (!ip_vs_conn_unhash(cp
))
640 * refcnt==1 implies I'm the only one referrer
642 if (likely(atomic_read(&cp
->refcnt
) == 1)) {
643 /* delete the timer if it is activated by other users */
644 if (timer_pending(&cp
->timer
))
645 del_timer(&cp
->timer
);
647 /* does anybody control me? */
649 ip_vs_control_del(cp
);
651 if (unlikely(cp
->app
!= NULL
))
652 ip_vs_unbind_app(cp
);
653 ip_vs_unbind_dest(cp
);
654 if (cp
->flags
& IP_VS_CONN_F_NO_CPORT
)
655 atomic_dec(&ip_vs_conn_no_cport_cnt
);
656 atomic_dec(&ip_vs_conn_count
);
658 kmem_cache_free(ip_vs_conn_cachep
, cp
);
662 /* hash it back to the table */
666 IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
667 atomic_read(&cp
->refcnt
)-1,
668 atomic_read(&cp
->n_control
));
674 void ip_vs_conn_expire_now(struct ip_vs_conn
*cp
)
676 if (del_timer(&cp
->timer
))
677 mod_timer(&cp
->timer
, jiffies
);
682 * Create a new connection entry and hash it into the ip_vs_conn_tab
685 ip_vs_conn_new(int af
, int proto
, const union nf_inet_addr
*caddr
, __be16 cport
,
686 const union nf_inet_addr
*vaddr
, __be16 vport
,
687 const union nf_inet_addr
*daddr
, __be16 dport
, unsigned flags
,
688 struct ip_vs_dest
*dest
)
690 struct ip_vs_conn
*cp
;
691 struct ip_vs_protocol
*pp
= ip_vs_proto_get(proto
);
693 cp
= kmem_cache_zalloc(ip_vs_conn_cachep
, GFP_ATOMIC
);
695 IP_VS_ERR_RL("%s(): no memory\n", __func__
);
699 INIT_LIST_HEAD(&cp
->c_list
);
700 setup_timer(&cp
->timer
, ip_vs_conn_expire
, (unsigned long)cp
);
702 cp
->protocol
= proto
;
703 ip_vs_addr_copy(af
, &cp
->caddr
, caddr
);
705 ip_vs_addr_copy(af
, &cp
->vaddr
, vaddr
);
707 /* proto should only be IPPROTO_IP if d_addr is a fwmark */
708 ip_vs_addr_copy(proto
== IPPROTO_IP
? AF_UNSPEC
: af
,
712 spin_lock_init(&cp
->lock
);
715 * Set the entry is referenced by the current thread before hashing
716 * it in the table, so that other thread run ip_vs_random_dropentry
717 * but cannot drop this entry.
719 atomic_set(&cp
->refcnt
, 1);
721 atomic_set(&cp
->n_control
, 0);
722 atomic_set(&cp
->in_pkts
, 0);
724 atomic_inc(&ip_vs_conn_count
);
725 if (flags
& IP_VS_CONN_F_NO_CPORT
)
726 atomic_inc(&ip_vs_conn_no_cport_cnt
);
728 /* Bind the connection with a destination server */
729 ip_vs_bind_dest(cp
, dest
);
731 /* Set its state and timeout */
735 /* Bind its packet transmitter */
736 #ifdef CONFIG_IP_VS_IPV6
738 ip_vs_bind_xmit_v6(cp
);
743 if (unlikely(pp
&& atomic_read(&pp
->appcnt
)))
744 ip_vs_bind_app(cp
, pp
);
746 /* Hash it in the ip_vs_conn_tab finally */
754 * /proc/net/ip_vs_conn entries
756 #ifdef CONFIG_PROC_FS
758 static void *ip_vs_conn_array(struct seq_file
*seq
, loff_t pos
)
761 struct ip_vs_conn
*cp
;
763 for(idx
= 0; idx
< IP_VS_CONN_TAB_SIZE
; idx
++) {
764 ct_read_lock_bh(idx
);
765 list_for_each_entry(cp
, &ip_vs_conn_tab
[idx
], c_list
) {
767 seq
->private = &ip_vs_conn_tab
[idx
];
771 ct_read_unlock_bh(idx
);
777 static void *ip_vs_conn_seq_start(struct seq_file
*seq
, loff_t
*pos
)
780 return *pos
? ip_vs_conn_array(seq
, *pos
- 1) :SEQ_START_TOKEN
;
783 static void *ip_vs_conn_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
785 struct ip_vs_conn
*cp
= v
;
786 struct list_head
*e
, *l
= seq
->private;
790 if (v
== SEQ_START_TOKEN
)
791 return ip_vs_conn_array(seq
, 0);
793 /* more on same hash chain? */
794 if ((e
= cp
->c_list
.next
) != l
)
795 return list_entry(e
, struct ip_vs_conn
, c_list
);
797 idx
= l
- ip_vs_conn_tab
;
798 ct_read_unlock_bh(idx
);
800 while (++idx
< IP_VS_CONN_TAB_SIZE
) {
801 ct_read_lock_bh(idx
);
802 list_for_each_entry(cp
, &ip_vs_conn_tab
[idx
], c_list
) {
803 seq
->private = &ip_vs_conn_tab
[idx
];
806 ct_read_unlock_bh(idx
);
812 static void ip_vs_conn_seq_stop(struct seq_file
*seq
, void *v
)
814 struct list_head
*l
= seq
->private;
817 ct_read_unlock_bh(l
- ip_vs_conn_tab
);
820 static int ip_vs_conn_seq_show(struct seq_file
*seq
, void *v
)
823 if (v
== SEQ_START_TOKEN
)
825 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires\n");
827 const struct ip_vs_conn
*cp
= v
;
829 #ifdef CONFIG_IP_VS_IPV6
830 if (cp
->af
== AF_INET6
)
831 seq_printf(seq
, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %7lu\n",
832 ip_vs_proto_name(cp
->protocol
),
833 &cp
->caddr
.in6
, ntohs(cp
->cport
),
834 &cp
->vaddr
.in6
, ntohs(cp
->vport
),
835 &cp
->daddr
.in6
, ntohs(cp
->dport
),
836 ip_vs_state_name(cp
->protocol
, cp
->state
),
837 (cp
->timer
.expires
-jiffies
)/HZ
);
841 "%-3s %08X %04X %08X %04X"
842 " %08X %04X %-11s %7lu\n",
843 ip_vs_proto_name(cp
->protocol
),
844 ntohl(cp
->caddr
.ip
), ntohs(cp
->cport
),
845 ntohl(cp
->vaddr
.ip
), ntohs(cp
->vport
),
846 ntohl(cp
->daddr
.ip
), ntohs(cp
->dport
),
847 ip_vs_state_name(cp
->protocol
, cp
->state
),
848 (cp
->timer
.expires
-jiffies
)/HZ
);
853 static const struct seq_operations ip_vs_conn_seq_ops
= {
854 .start
= ip_vs_conn_seq_start
,
855 .next
= ip_vs_conn_seq_next
,
856 .stop
= ip_vs_conn_seq_stop
,
857 .show
= ip_vs_conn_seq_show
,
860 static int ip_vs_conn_open(struct inode
*inode
, struct file
*file
)
862 return seq_open(file
, &ip_vs_conn_seq_ops
);
865 static const struct file_operations ip_vs_conn_fops
= {
866 .owner
= THIS_MODULE
,
867 .open
= ip_vs_conn_open
,
870 .release
= seq_release
,
873 static const char *ip_vs_origin_name(unsigned flags
)
875 if (flags
& IP_VS_CONN_F_SYNC
)
881 static int ip_vs_conn_sync_seq_show(struct seq_file
*seq
, void *v
)
884 if (v
== SEQ_START_TOKEN
)
886 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
888 const struct ip_vs_conn
*cp
= v
;
890 #ifdef CONFIG_IP_VS_IPV6
891 if (cp
->af
== AF_INET6
)
892 seq_printf(seq
, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
893 ip_vs_proto_name(cp
->protocol
),
894 &cp
->caddr
.in6
, ntohs(cp
->cport
),
895 &cp
->vaddr
.in6
, ntohs(cp
->vport
),
896 &cp
->daddr
.in6
, ntohs(cp
->dport
),
897 ip_vs_state_name(cp
->protocol
, cp
->state
),
898 ip_vs_origin_name(cp
->flags
),
899 (cp
->timer
.expires
-jiffies
)/HZ
);
903 "%-3s %08X %04X %08X %04X "
904 "%08X %04X %-11s %-6s %7lu\n",
905 ip_vs_proto_name(cp
->protocol
),
906 ntohl(cp
->caddr
.ip
), ntohs(cp
->cport
),
907 ntohl(cp
->vaddr
.ip
), ntohs(cp
->vport
),
908 ntohl(cp
->daddr
.ip
), ntohs(cp
->dport
),
909 ip_vs_state_name(cp
->protocol
, cp
->state
),
910 ip_vs_origin_name(cp
->flags
),
911 (cp
->timer
.expires
-jiffies
)/HZ
);
916 static const struct seq_operations ip_vs_conn_sync_seq_ops
= {
917 .start
= ip_vs_conn_seq_start
,
918 .next
= ip_vs_conn_seq_next
,
919 .stop
= ip_vs_conn_seq_stop
,
920 .show
= ip_vs_conn_sync_seq_show
,
923 static int ip_vs_conn_sync_open(struct inode
*inode
, struct file
*file
)
925 return seq_open(file
, &ip_vs_conn_sync_seq_ops
);
928 static const struct file_operations ip_vs_conn_sync_fops
= {
929 .owner
= THIS_MODULE
,
930 .open
= ip_vs_conn_sync_open
,
933 .release
= seq_release
,
940 * Randomly drop connection entries before running out of memory
942 static inline int todrop_entry(struct ip_vs_conn
*cp
)
945 * The drop rate array needs tuning for real environments.
946 * Called from timer bh only => no locking
948 static const char todrop_rate
[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
949 static char todrop_counter
[9] = {0};
952 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
953 This will leave enough time for normal connection to get
955 if (time_before(cp
->timeout
+ jiffies
, cp
->timer
.expires
+ 60*HZ
))
958 /* Don't drop the entry if its number of incoming packets is not
960 i
= atomic_read(&cp
->in_pkts
);
961 if (i
> 8 || i
< 0) return 0;
963 if (!todrop_rate
[i
]) return 0;
964 if (--todrop_counter
[i
] > 0) return 0;
966 todrop_counter
[i
] = todrop_rate
[i
];
970 /* Called from keventd and must protect itself from softirqs */
971 void ip_vs_random_dropentry(void)
974 struct ip_vs_conn
*cp
;
977 * Randomly scan 1/32 of the whole table every second
979 for (idx
= 0; idx
< (IP_VS_CONN_TAB_SIZE
>>5); idx
++) {
980 unsigned hash
= net_random() & IP_VS_CONN_TAB_MASK
;
983 * Lock is actually needed in this loop.
985 ct_write_lock_bh(hash
);
987 list_for_each_entry(cp
, &ip_vs_conn_tab
[hash
], c_list
) {
988 if (cp
->flags
& IP_VS_CONN_F_TEMPLATE
)
989 /* connection template */
992 if (cp
->protocol
== IPPROTO_TCP
) {
994 case IP_VS_TCP_S_SYN_RECV
:
995 case IP_VS_TCP_S_SYNACK
:
998 case IP_VS_TCP_S_ESTABLISHED
:
999 if (todrop_entry(cp
))
1007 if (!todrop_entry(cp
))
1011 IP_VS_DBG(4, "del connection\n");
1012 ip_vs_conn_expire_now(cp
);
1014 IP_VS_DBG(4, "del conn template\n");
1015 ip_vs_conn_expire_now(cp
->control
);
1018 ct_write_unlock_bh(hash
);
1024 * Flush all the connection entries in the ip_vs_conn_tab
1026 static void ip_vs_conn_flush(void)
1029 struct ip_vs_conn
*cp
;
1032 for (idx
=0; idx
<IP_VS_CONN_TAB_SIZE
; idx
++) {
1034 * Lock is actually needed in this loop.
1036 ct_write_lock_bh(idx
);
1038 list_for_each_entry(cp
, &ip_vs_conn_tab
[idx
], c_list
) {
1040 IP_VS_DBG(4, "del connection\n");
1041 ip_vs_conn_expire_now(cp
);
1043 IP_VS_DBG(4, "del conn template\n");
1044 ip_vs_conn_expire_now(cp
->control
);
1047 ct_write_unlock_bh(idx
);
1050 /* the counter may be not NULL, because maybe some conn entries
1051 are run by slow timer handler or unhashed but still referred */
1052 if (atomic_read(&ip_vs_conn_count
) != 0) {
1059 int __init
ip_vs_conn_init(void)
1064 * Allocate the connection hash table and initialize its list heads
1066 ip_vs_conn_tab
= vmalloc(IP_VS_CONN_TAB_SIZE
*sizeof(struct list_head
));
1067 if (!ip_vs_conn_tab
)
1070 /* Allocate ip_vs_conn slab cache */
1071 ip_vs_conn_cachep
= kmem_cache_create("ip_vs_conn",
1072 sizeof(struct ip_vs_conn
), 0,
1073 SLAB_HWCACHE_ALIGN
, NULL
);
1074 if (!ip_vs_conn_cachep
) {
1075 vfree(ip_vs_conn_tab
);
1079 pr_info("Connection hash table configured "
1080 "(size=%d, memory=%ldKbytes)\n",
1081 IP_VS_CONN_TAB_SIZE
,
1082 (long)(IP_VS_CONN_TAB_SIZE
*sizeof(struct list_head
))/1024);
1083 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1084 sizeof(struct ip_vs_conn
));
1086 for (idx
= 0; idx
< IP_VS_CONN_TAB_SIZE
; idx
++) {
1087 INIT_LIST_HEAD(&ip_vs_conn_tab
[idx
]);
1090 for (idx
= 0; idx
< CT_LOCKARRAY_SIZE
; idx
++) {
1091 rwlock_init(&__ip_vs_conntbl_lock_array
[idx
].l
);
1094 proc_net_fops_create(&init_net
, "ip_vs_conn", 0, &ip_vs_conn_fops
);
1095 proc_net_fops_create(&init_net
, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops
);
1097 /* calculate the random value for connection hash */
1098 get_random_bytes(&ip_vs_conn_rnd
, sizeof(ip_vs_conn_rnd
));
1104 void ip_vs_conn_cleanup(void)
1106 /* flush all the connection entries first */
1109 /* Release the empty cache */
1110 kmem_cache_destroy(ip_vs_conn_cachep
);
1111 proc_net_remove(&init_net
, "ip_vs_conn");
1112 proc_net_remove(&init_net
, "ip_vs_conn_sync");
1113 vfree(ip_vs_conn_tab
);