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 static 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 __read_mostly
;
57 static int ip_vs_conn_tab_mask __read_mostly
;
60 * Connection hash table: for input and output packets lookups of IPVS
62 static struct hlist_head
*ip_vs_conn_tab __read_mostly
;
64 /* SLAB cache for IPVS connections */
65 static struct kmem_cache
*ip_vs_conn_cachep __read_mostly
;
67 /* counter for no client port connections */
68 static atomic_t ip_vs_conn_no_cport_cnt
= ATOMIC_INIT(0);
70 /* random value for IPVS connection hash */
71 static unsigned int ip_vs_conn_rnd __read_mostly
;
74 * Fine locking granularity for big connection hash table
76 #define CT_LOCKARRAY_BITS 5
77 #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
78 #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
80 struct ip_vs_aligned_lock
83 } __attribute__((__aligned__(SMP_CACHE_BYTES
)));
85 /* lock array for conn table */
86 static struct ip_vs_aligned_lock
87 __ip_vs_conntbl_lock_array
[CT_LOCKARRAY_SIZE
] __cacheline_aligned
;
89 static inline void ct_read_lock(unsigned key
)
91 read_lock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
94 static inline void ct_read_unlock(unsigned key
)
96 read_unlock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
99 static inline void ct_write_lock(unsigned key
)
101 write_lock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
104 static inline void ct_write_unlock(unsigned key
)
106 write_unlock(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
109 static inline void ct_read_lock_bh(unsigned key
)
111 read_lock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
114 static inline void ct_read_unlock_bh(unsigned key
)
116 read_unlock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
119 static inline void ct_write_lock_bh(unsigned key
)
121 write_lock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
124 static inline void ct_write_unlock_bh(unsigned key
)
126 write_unlock_bh(&__ip_vs_conntbl_lock_array
[key
&CT_LOCKARRAY_MASK
].l
);
131 * Returns hash value for IPVS connection entry
133 static unsigned int ip_vs_conn_hashkey(struct net
*net
, int af
, unsigned proto
,
134 const union nf_inet_addr
*addr
,
137 #ifdef CONFIG_IP_VS_IPV6
139 return (jhash_3words(jhash(addr
, 16, ip_vs_conn_rnd
),
140 (__force u32
)port
, proto
, ip_vs_conn_rnd
) ^
141 ((size_t)net
>>8)) & ip_vs_conn_tab_mask
;
143 return (jhash_3words((__force u32
)addr
->ip
, (__force u32
)port
, proto
,
145 ((size_t)net
>>8)) & ip_vs_conn_tab_mask
;
148 static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param
*p
,
151 const union nf_inet_addr
*addr
;
154 if (p
->pe_data
&& p
->pe
->hashkey_raw
)
155 return p
->pe
->hashkey_raw(p
, ip_vs_conn_rnd
, inverse
) &
158 if (likely(!inverse
)) {
166 return ip_vs_conn_hashkey(p
->net
, p
->af
, p
->protocol
, addr
, port
);
169 static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn
*cp
)
171 struct ip_vs_conn_param p
;
173 ip_vs_conn_fill_param(ip_vs_conn_net(cp
), cp
->af
, cp
->protocol
,
174 &cp
->caddr
, cp
->cport
, NULL
, 0, &p
);
178 p
.pe_data
= cp
->pe_data
;
179 p
.pe_data_len
= cp
->pe_data_len
;
182 return ip_vs_conn_hashkey_param(&p
, false);
186 * Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port.
187 * returns bool success.
189 static inline int ip_vs_conn_hash(struct ip_vs_conn
*cp
)
194 if (cp
->flags
& IP_VS_CONN_F_ONE_PACKET
)
197 /* Hash by protocol, client address and port */
198 hash
= ip_vs_conn_hashkey_conn(cp
);
201 spin_lock(&cp
->lock
);
203 if (!(cp
->flags
& IP_VS_CONN_F_HASHED
)) {
204 hlist_add_head(&cp
->c_list
, &ip_vs_conn_tab
[hash
]);
205 cp
->flags
|= IP_VS_CONN_F_HASHED
;
206 atomic_inc(&cp
->refcnt
);
209 pr_err("%s(): request for already hashed, called from %pF\n",
210 __func__
, __builtin_return_address(0));
214 spin_unlock(&cp
->lock
);
215 ct_write_unlock(hash
);
222 * UNhashes ip_vs_conn from ip_vs_conn_tab.
223 * returns bool success.
225 static inline int ip_vs_conn_unhash(struct ip_vs_conn
*cp
)
230 /* unhash it and decrease its reference counter */
231 hash
= ip_vs_conn_hashkey_conn(cp
);
234 spin_lock(&cp
->lock
);
236 if (cp
->flags
& IP_VS_CONN_F_HASHED
) {
237 hlist_del(&cp
->c_list
);
238 cp
->flags
&= ~IP_VS_CONN_F_HASHED
;
239 atomic_dec(&cp
->refcnt
);
244 spin_unlock(&cp
->lock
);
245 ct_write_unlock(hash
);
252 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
253 * Called for pkts coming from OUTside-to-INside.
254 * p->caddr, p->cport: pkt source address (foreign host)
255 * p->vaddr, p->vport: pkt dest address (load balancer)
257 static inline struct ip_vs_conn
*
258 __ip_vs_conn_in_get(const struct ip_vs_conn_param
*p
)
261 struct ip_vs_conn
*cp
;
262 struct hlist_node
*n
;
264 hash
= ip_vs_conn_hashkey_param(p
, false);
268 hlist_for_each_entry(cp
, n
, &ip_vs_conn_tab
[hash
], c_list
) {
269 if (cp
->af
== p
->af
&&
270 p
->cport
== cp
->cport
&& p
->vport
== cp
->vport
&&
271 ip_vs_addr_equal(p
->af
, p
->caddr
, &cp
->caddr
) &&
272 ip_vs_addr_equal(p
->af
, p
->vaddr
, &cp
->vaddr
) &&
273 ((!p
->cport
) ^ (!(cp
->flags
& IP_VS_CONN_F_NO_CPORT
))) &&
274 p
->protocol
== cp
->protocol
&&
275 ip_vs_conn_net_eq(cp
, p
->net
)) {
277 atomic_inc(&cp
->refcnt
);
278 ct_read_unlock(hash
);
283 ct_read_unlock(hash
);
288 struct ip_vs_conn
*ip_vs_conn_in_get(const struct ip_vs_conn_param
*p
)
290 struct ip_vs_conn
*cp
;
292 cp
= __ip_vs_conn_in_get(p
);
293 if (!cp
&& atomic_read(&ip_vs_conn_no_cport_cnt
)) {
294 struct ip_vs_conn_param cport_zero_p
= *p
;
295 cport_zero_p
.cport
= 0;
296 cp
= __ip_vs_conn_in_get(&cport_zero_p
);
299 IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n",
300 ip_vs_proto_name(p
->protocol
),
301 IP_VS_DBG_ADDR(p
->af
, p
->caddr
), ntohs(p
->cport
),
302 IP_VS_DBG_ADDR(p
->af
, p
->vaddr
), ntohs(p
->vport
),
303 cp
? "hit" : "not hit");
309 ip_vs_conn_fill_param_proto(int af
, const struct sk_buff
*skb
,
310 const struct ip_vs_iphdr
*iph
,
311 unsigned int proto_off
, int inverse
,
312 struct ip_vs_conn_param
*p
)
314 __be16 _ports
[2], *pptr
;
315 struct net
*net
= skb_net(skb
);
317 pptr
= skb_header_pointer(skb
, proto_off
, sizeof(_ports
), _ports
);
321 if (likely(!inverse
))
322 ip_vs_conn_fill_param(net
, af
, iph
->protocol
, &iph
->saddr
,
323 pptr
[0], &iph
->daddr
, pptr
[1], p
);
325 ip_vs_conn_fill_param(net
, af
, iph
->protocol
, &iph
->daddr
,
326 pptr
[1], &iph
->saddr
, pptr
[0], p
);
331 ip_vs_conn_in_get_proto(int af
, const struct sk_buff
*skb
,
332 const struct ip_vs_iphdr
*iph
,
333 unsigned int proto_off
, int inverse
)
335 struct ip_vs_conn_param p
;
337 if (ip_vs_conn_fill_param_proto(af
, skb
, iph
, proto_off
, inverse
, &p
))
340 return ip_vs_conn_in_get(&p
);
342 EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto
);
344 /* Get reference to connection template */
345 struct ip_vs_conn
*ip_vs_ct_in_get(const struct ip_vs_conn_param
*p
)
348 struct ip_vs_conn
*cp
;
349 struct hlist_node
*n
;
351 hash
= ip_vs_conn_hashkey_param(p
, false);
355 hlist_for_each_entry(cp
, n
, &ip_vs_conn_tab
[hash
], c_list
) {
356 if (!ip_vs_conn_net_eq(cp
, p
->net
))
358 if (p
->pe_data
&& p
->pe
->ct_match
) {
359 if (p
->pe
== cp
->pe
&& p
->pe
->ct_match(p
, cp
))
364 if (cp
->af
== p
->af
&&
365 ip_vs_addr_equal(p
->af
, p
->caddr
, &cp
->caddr
) &&
366 /* protocol should only be IPPROTO_IP if
367 * p->vaddr is a fwmark */
368 ip_vs_addr_equal(p
->protocol
== IPPROTO_IP
? AF_UNSPEC
:
369 p
->af
, p
->vaddr
, &cp
->vaddr
) &&
370 p
->cport
== cp
->cport
&& p
->vport
== cp
->vport
&&
371 cp
->flags
& IP_VS_CONN_F_TEMPLATE
&&
372 p
->protocol
== cp
->protocol
)
379 atomic_inc(&cp
->refcnt
);
380 ct_read_unlock(hash
);
382 IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
383 ip_vs_proto_name(p
->protocol
),
384 IP_VS_DBG_ADDR(p
->af
, p
->caddr
), ntohs(p
->cport
),
385 IP_VS_DBG_ADDR(p
->af
, p
->vaddr
), ntohs(p
->vport
),
386 cp
? "hit" : "not hit");
391 /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
392 * Called for pkts coming from inside-to-OUTside.
393 * p->caddr, p->cport: pkt source address (inside host)
394 * p->vaddr, p->vport: pkt dest address (foreign host) */
395 struct ip_vs_conn
*ip_vs_conn_out_get(const struct ip_vs_conn_param
*p
)
398 struct ip_vs_conn
*cp
, *ret
=NULL
;
399 struct hlist_node
*n
;
402 * Check for "full" addressed entries
404 hash
= ip_vs_conn_hashkey_param(p
, true);
408 hlist_for_each_entry(cp
, n
, &ip_vs_conn_tab
[hash
], c_list
) {
409 if (cp
->af
== p
->af
&&
410 p
->vport
== cp
->cport
&& p
->cport
== cp
->dport
&&
411 ip_vs_addr_equal(p
->af
, p
->vaddr
, &cp
->caddr
) &&
412 ip_vs_addr_equal(p
->af
, p
->caddr
, &cp
->daddr
) &&
413 p
->protocol
== cp
->protocol
&&
414 ip_vs_conn_net_eq(cp
, p
->net
)) {
416 atomic_inc(&cp
->refcnt
);
422 ct_read_unlock(hash
);
424 IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
425 ip_vs_proto_name(p
->protocol
),
426 IP_VS_DBG_ADDR(p
->af
, p
->caddr
), ntohs(p
->cport
),
427 IP_VS_DBG_ADDR(p
->af
, p
->vaddr
), ntohs(p
->vport
),
428 ret
? "hit" : "not hit");
434 ip_vs_conn_out_get_proto(int af
, const struct sk_buff
*skb
,
435 const struct ip_vs_iphdr
*iph
,
436 unsigned int proto_off
, int inverse
)
438 struct ip_vs_conn_param p
;
440 if (ip_vs_conn_fill_param_proto(af
, skb
, iph
, proto_off
, inverse
, &p
))
443 return ip_vs_conn_out_get(&p
);
445 EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto
);
448 * Put back the conn and restart its timer with its timeout
450 void ip_vs_conn_put(struct ip_vs_conn
*cp
)
452 unsigned long t
= (cp
->flags
& IP_VS_CONN_F_ONE_PACKET
) ?
454 mod_timer(&cp
->timer
, jiffies
+t
);
456 __ip_vs_conn_put(cp
);
461 * Fill a no_client_port connection with a client port number
463 void ip_vs_conn_fill_cport(struct ip_vs_conn
*cp
, __be16 cport
)
465 if (ip_vs_conn_unhash(cp
)) {
466 spin_lock(&cp
->lock
);
467 if (cp
->flags
& IP_VS_CONN_F_NO_CPORT
) {
468 atomic_dec(&ip_vs_conn_no_cport_cnt
);
469 cp
->flags
&= ~IP_VS_CONN_F_NO_CPORT
;
472 spin_unlock(&cp
->lock
);
474 /* hash on new dport */
481 * Bind a connection entry with the corresponding packet_xmit.
482 * Called by ip_vs_conn_new.
484 static inline void ip_vs_bind_xmit(struct ip_vs_conn
*cp
)
486 switch (IP_VS_FWD_METHOD(cp
)) {
487 case IP_VS_CONN_F_MASQ
:
488 cp
->packet_xmit
= ip_vs_nat_xmit
;
491 case IP_VS_CONN_F_TUNNEL
:
492 cp
->packet_xmit
= ip_vs_tunnel_xmit
;
495 case IP_VS_CONN_F_DROUTE
:
496 cp
->packet_xmit
= ip_vs_dr_xmit
;
499 case IP_VS_CONN_F_LOCALNODE
:
500 cp
->packet_xmit
= ip_vs_null_xmit
;
503 case IP_VS_CONN_F_BYPASS
:
504 cp
->packet_xmit
= ip_vs_bypass_xmit
;
509 #ifdef CONFIG_IP_VS_IPV6
510 static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn
*cp
)
512 switch (IP_VS_FWD_METHOD(cp
)) {
513 case IP_VS_CONN_F_MASQ
:
514 cp
->packet_xmit
= ip_vs_nat_xmit_v6
;
517 case IP_VS_CONN_F_TUNNEL
:
518 cp
->packet_xmit
= ip_vs_tunnel_xmit_v6
;
521 case IP_VS_CONN_F_DROUTE
:
522 cp
->packet_xmit
= ip_vs_dr_xmit_v6
;
525 case IP_VS_CONN_F_LOCALNODE
:
526 cp
->packet_xmit
= ip_vs_null_xmit
;
529 case IP_VS_CONN_F_BYPASS
:
530 cp
->packet_xmit
= ip_vs_bypass_xmit_v6
;
537 static inline int ip_vs_dest_totalconns(struct ip_vs_dest
*dest
)
539 return atomic_read(&dest
->activeconns
)
540 + atomic_read(&dest
->inactconns
);
544 * Bind a connection entry with a virtual service destination
545 * Called just after a new connection entry is created.
548 ip_vs_bind_dest(struct ip_vs_conn
*cp
, struct ip_vs_dest
*dest
)
550 unsigned int conn_flags
;
552 /* if dest is NULL, then return directly */
556 /* Increase the refcnt counter of the dest */
557 atomic_inc(&dest
->refcnt
);
559 conn_flags
= atomic_read(&dest
->conn_flags
);
560 if (cp
->protocol
!= IPPROTO_UDP
)
561 conn_flags
&= ~IP_VS_CONN_F_ONE_PACKET
;
562 /* Bind with the destination and its corresponding transmitter */
563 if (cp
->flags
& IP_VS_CONN_F_SYNC
) {
564 /* if the connection is not template and is created
565 * by sync, preserve the activity flag.
567 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
))
568 conn_flags
&= ~IP_VS_CONN_F_INACTIVE
;
569 /* connections inherit forwarding method from dest */
570 cp
->flags
&= ~IP_VS_CONN_F_FWD_MASK
;
572 cp
->flags
|= conn_flags
;
575 IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
576 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
578 ip_vs_proto_name(cp
->protocol
),
579 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
), ntohs(cp
->cport
),
580 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
), ntohs(cp
->vport
),
581 IP_VS_DBG_ADDR(cp
->af
, &cp
->daddr
), ntohs(cp
->dport
),
582 ip_vs_fwd_tag(cp
), cp
->state
,
583 cp
->flags
, atomic_read(&cp
->refcnt
),
584 atomic_read(&dest
->refcnt
));
586 /* Update the connection counters */
587 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)) {
588 /* It is a normal connection, so increase the inactive
589 connection counter because it is in TCP SYNRECV
590 state (inactive) or other protocol inacive state */
591 if ((cp
->flags
& IP_VS_CONN_F_SYNC
) &&
592 (!(cp
->flags
& IP_VS_CONN_F_INACTIVE
)))
593 atomic_inc(&dest
->activeconns
);
595 atomic_inc(&dest
->inactconns
);
597 /* It is a persistent connection/template, so increase
598 the peristent connection counter */
599 atomic_inc(&dest
->persistconns
);
602 if (dest
->u_threshold
!= 0 &&
603 ip_vs_dest_totalconns(dest
) >= dest
->u_threshold
)
604 dest
->flags
|= IP_VS_DEST_F_OVERLOAD
;
609 * Check if there is a destination for the connection, if so
610 * bind the connection to the destination.
612 struct ip_vs_dest
*ip_vs_try_bind_dest(struct ip_vs_conn
*cp
)
614 struct ip_vs_dest
*dest
;
616 if ((cp
) && (!cp
->dest
)) {
617 dest
= ip_vs_find_dest(ip_vs_conn_net(cp
), cp
->af
, &cp
->daddr
,
618 cp
->dport
, &cp
->vaddr
, cp
->vport
,
619 cp
->protocol
, cp
->fwmark
);
620 ip_vs_bind_dest(cp
, dest
);
628 * Unbind a connection entry with its VS destination
629 * Called by the ip_vs_conn_expire function.
631 static inline void ip_vs_unbind_dest(struct ip_vs_conn
*cp
)
633 struct ip_vs_dest
*dest
= cp
->dest
;
638 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
639 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
641 ip_vs_proto_name(cp
->protocol
),
642 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
), ntohs(cp
->cport
),
643 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
), ntohs(cp
->vport
),
644 IP_VS_DBG_ADDR(cp
->af
, &cp
->daddr
), ntohs(cp
->dport
),
645 ip_vs_fwd_tag(cp
), cp
->state
,
646 cp
->flags
, atomic_read(&cp
->refcnt
),
647 atomic_read(&dest
->refcnt
));
649 /* Update the connection counters */
650 if (!(cp
->flags
& IP_VS_CONN_F_TEMPLATE
)) {
651 /* It is a normal connection, so decrease the inactconns
652 or activeconns counter */
653 if (cp
->flags
& IP_VS_CONN_F_INACTIVE
) {
654 atomic_dec(&dest
->inactconns
);
656 atomic_dec(&dest
->activeconns
);
659 /* It is a persistent connection/template, so decrease
660 the peristent connection counter */
661 atomic_dec(&dest
->persistconns
);
664 if (dest
->l_threshold
!= 0) {
665 if (ip_vs_dest_totalconns(dest
) < dest
->l_threshold
)
666 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
667 } else if (dest
->u_threshold
!= 0) {
668 if (ip_vs_dest_totalconns(dest
) * 4 < dest
->u_threshold
* 3)
669 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
671 if (dest
->flags
& IP_VS_DEST_F_OVERLOAD
)
672 dest
->flags
&= ~IP_VS_DEST_F_OVERLOAD
;
676 * Simply decrease the refcnt of the dest, because the
677 * dest will be either in service's destination list
680 atomic_dec(&dest
->refcnt
);
683 static int expire_quiescent_template(struct netns_ipvs
*ipvs
,
684 struct ip_vs_dest
*dest
)
687 return ipvs
->sysctl_expire_quiescent_template
&&
688 (atomic_read(&dest
->weight
) == 0);
695 * Checking if the destination of a connection template is available.
696 * If available, return 1, otherwise invalidate this connection
697 * template and return 0.
699 int ip_vs_check_template(struct ip_vs_conn
*ct
)
701 struct ip_vs_dest
*dest
= ct
->dest
;
702 struct netns_ipvs
*ipvs
= net_ipvs(ip_vs_conn_net(ct
));
705 * Checking the dest server status.
707 if ((dest
== NULL
) ||
708 !(dest
->flags
& IP_VS_DEST_F_AVAILABLE
) ||
709 expire_quiescent_template(ipvs
, dest
)) {
710 IP_VS_DBG_BUF(9, "check_template: dest not available for "
711 "protocol %s s:%s:%d v:%s:%d "
713 ip_vs_proto_name(ct
->protocol
),
714 IP_VS_DBG_ADDR(ct
->af
, &ct
->caddr
),
716 IP_VS_DBG_ADDR(ct
->af
, &ct
->vaddr
),
718 IP_VS_DBG_ADDR(ct
->af
, &ct
->daddr
),
722 * Invalidate the connection template
724 if (ct
->vport
!= htons(0xffff)) {
725 if (ip_vs_conn_unhash(ct
)) {
726 ct
->dport
= htons(0xffff);
727 ct
->vport
= htons(0xffff);
734 * Simply decrease the refcnt of the template,
735 * don't restart its timer.
737 atomic_dec(&ct
->refcnt
);
743 static void ip_vs_conn_expire(unsigned long data
)
745 struct ip_vs_conn
*cp
= (struct ip_vs_conn
*)data
;
746 struct netns_ipvs
*ipvs
= net_ipvs(ip_vs_conn_net(cp
));
753 atomic_inc(&cp
->refcnt
);
756 * do I control anybody?
758 if (atomic_read(&cp
->n_control
))
762 * unhash it if it is hashed in the conn table
764 if (!ip_vs_conn_unhash(cp
) && !(cp
->flags
& IP_VS_CONN_F_ONE_PACKET
))
768 * refcnt==1 implies I'm the only one referrer
770 if (likely(atomic_read(&cp
->refcnt
) == 1)) {
771 /* delete the timer if it is activated by other users */
772 if (timer_pending(&cp
->timer
))
773 del_timer(&cp
->timer
);
775 /* does anybody control me? */
777 ip_vs_control_del(cp
);
779 if (cp
->flags
& IP_VS_CONN_F_NFCT
)
780 ip_vs_conn_drop_conntrack(cp
);
782 ip_vs_pe_put(cp
->pe
);
784 if (unlikely(cp
->app
!= NULL
))
785 ip_vs_unbind_app(cp
);
786 ip_vs_unbind_dest(cp
);
787 if (cp
->flags
& IP_VS_CONN_F_NO_CPORT
)
788 atomic_dec(&ip_vs_conn_no_cport_cnt
);
789 atomic_dec(&ipvs
->conn_count
);
791 kmem_cache_free(ip_vs_conn_cachep
, cp
);
795 /* hash it back to the table */
799 IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
800 atomic_read(&cp
->refcnt
)-1,
801 atomic_read(&cp
->n_control
));
807 void ip_vs_conn_expire_now(struct ip_vs_conn
*cp
)
809 if (del_timer(&cp
->timer
))
810 mod_timer(&cp
->timer
, jiffies
);
815 * Create a new connection entry and hash it into the ip_vs_conn_tab
818 ip_vs_conn_new(const struct ip_vs_conn_param
*p
,
819 const union nf_inet_addr
*daddr
, __be16 dport
, unsigned flags
,
820 struct ip_vs_dest
*dest
, __u32 fwmark
)
822 struct ip_vs_conn
*cp
;
823 struct netns_ipvs
*ipvs
= net_ipvs(p
->net
);
824 struct ip_vs_proto_data
*pd
= ip_vs_proto_data_get(p
->net
,
827 cp
= kmem_cache_zalloc(ip_vs_conn_cachep
, GFP_ATOMIC
);
829 IP_VS_ERR_RL("%s(): no memory\n", __func__
);
833 INIT_HLIST_NODE(&cp
->c_list
);
834 setup_timer(&cp
->timer
, ip_vs_conn_expire
, (unsigned long)cp
);
835 ip_vs_conn_net_set(cp
, p
->net
);
837 cp
->protocol
= p
->protocol
;
838 ip_vs_addr_copy(p
->af
, &cp
->caddr
, p
->caddr
);
839 cp
->cport
= p
->cport
;
840 ip_vs_addr_copy(p
->af
, &cp
->vaddr
, p
->vaddr
);
841 cp
->vport
= p
->vport
;
842 /* proto should only be IPPROTO_IP if d_addr is a fwmark */
843 ip_vs_addr_copy(p
->protocol
== IPPROTO_IP
? AF_UNSPEC
: p
->af
,
848 if (flags
& IP_VS_CONN_F_TEMPLATE
&& p
->pe
) {
851 cp
->pe_data
= p
->pe_data
;
852 cp
->pe_data_len
= p
->pe_data_len
;
854 spin_lock_init(&cp
->lock
);
857 * Set the entry is referenced by the current thread before hashing
858 * it in the table, so that other thread run ip_vs_random_dropentry
859 * but cannot drop this entry.
861 atomic_set(&cp
->refcnt
, 1);
863 atomic_set(&cp
->n_control
, 0);
864 atomic_set(&cp
->in_pkts
, 0);
866 atomic_inc(&ipvs
->conn_count
);
867 if (flags
& IP_VS_CONN_F_NO_CPORT
)
868 atomic_inc(&ip_vs_conn_no_cport_cnt
);
870 /* Bind the connection with a destination server */
871 ip_vs_bind_dest(cp
, dest
);
873 /* Set its state and timeout */
877 /* Bind its packet transmitter */
878 #ifdef CONFIG_IP_VS_IPV6
879 if (p
->af
== AF_INET6
)
880 ip_vs_bind_xmit_v6(cp
);
885 if (unlikely(pd
&& atomic_read(&pd
->appcnt
)))
886 ip_vs_bind_app(cp
, pd
->pp
);
889 * Allow conntrack to be preserved. By default, conntrack
890 * is created and destroyed for every packet.
891 * Sometimes keeping conntrack can be useful for
892 * IP_VS_CONN_F_ONE_PACKET too.
895 if (ip_vs_conntrack_enabled(ipvs
))
896 cp
->flags
|= IP_VS_CONN_F_NFCT
;
898 /* Hash it in the ip_vs_conn_tab finally */
905 * /proc/net/ip_vs_conn entries
907 #ifdef CONFIG_PROC_FS
908 struct ip_vs_iter_state
{
909 struct seq_net_private p
;
910 struct hlist_head
*l
;
913 static void *ip_vs_conn_array(struct seq_file
*seq
, loff_t pos
)
916 struct ip_vs_conn
*cp
;
917 struct ip_vs_iter_state
*iter
= seq
->private;
918 struct hlist_node
*n
;
920 for (idx
= 0; idx
< ip_vs_conn_tab_size
; idx
++) {
921 ct_read_lock_bh(idx
);
922 hlist_for_each_entry(cp
, n
, &ip_vs_conn_tab
[idx
], c_list
) {
924 iter
->l
= &ip_vs_conn_tab
[idx
];
928 ct_read_unlock_bh(idx
);
934 static void *ip_vs_conn_seq_start(struct seq_file
*seq
, loff_t
*pos
)
936 struct ip_vs_iter_state
*iter
= seq
->private;
939 return *pos
? ip_vs_conn_array(seq
, *pos
- 1) :SEQ_START_TOKEN
;
942 static void *ip_vs_conn_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
944 struct ip_vs_conn
*cp
= v
;
945 struct ip_vs_iter_state
*iter
= seq
->private;
946 struct hlist_node
*e
;
947 struct hlist_head
*l
= iter
->l
;
951 if (v
== SEQ_START_TOKEN
)
952 return ip_vs_conn_array(seq
, 0);
954 /* more on same hash chain? */
955 if ((e
= cp
->c_list
.next
))
956 return hlist_entry(e
, struct ip_vs_conn
, c_list
);
958 idx
= l
- ip_vs_conn_tab
;
959 ct_read_unlock_bh(idx
);
961 while (++idx
< ip_vs_conn_tab_size
) {
962 ct_read_lock_bh(idx
);
963 hlist_for_each_entry(cp
, e
, &ip_vs_conn_tab
[idx
], c_list
) {
964 iter
->l
= &ip_vs_conn_tab
[idx
];
967 ct_read_unlock_bh(idx
);
973 static void ip_vs_conn_seq_stop(struct seq_file
*seq
, void *v
)
975 struct ip_vs_iter_state
*iter
= seq
->private;
976 struct hlist_head
*l
= iter
->l
;
979 ct_read_unlock_bh(l
- ip_vs_conn_tab
);
982 static int ip_vs_conn_seq_show(struct seq_file
*seq
, void *v
)
985 if (v
== SEQ_START_TOKEN
)
987 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n");
989 const struct ip_vs_conn
*cp
= v
;
990 struct net
*net
= seq_file_net(seq
);
991 char pe_data
[IP_VS_PENAME_MAXLEN
+ IP_VS_PEDATA_MAXLEN
+ 3];
994 if (!ip_vs_conn_net_eq(cp
, net
))
998 len
= strlen(cp
->pe
->name
);
999 memcpy(pe_data
+ 1, cp
->pe
->name
, len
);
1000 pe_data
[len
+ 1] = ' ';
1002 len
+= cp
->pe
->show_pe_data(cp
, pe_data
+ len
);
1004 pe_data
[len
] = '\0';
1006 #ifdef CONFIG_IP_VS_IPV6
1007 if (cp
->af
== AF_INET6
)
1008 seq_printf(seq
, "%-3s %pI6 %04X %pI6 %04X "
1009 "%pI6 %04X %-11s %7lu%s\n",
1010 ip_vs_proto_name(cp
->protocol
),
1011 &cp
->caddr
.in6
, ntohs(cp
->cport
),
1012 &cp
->vaddr
.in6
, ntohs(cp
->vport
),
1013 &cp
->daddr
.in6
, ntohs(cp
->dport
),
1014 ip_vs_state_name(cp
->protocol
, cp
->state
),
1015 (cp
->timer
.expires
-jiffies
)/HZ
, pe_data
);
1019 "%-3s %08X %04X %08X %04X"
1020 " %08X %04X %-11s %7lu%s\n",
1021 ip_vs_proto_name(cp
->protocol
),
1022 ntohl(cp
->caddr
.ip
), ntohs(cp
->cport
),
1023 ntohl(cp
->vaddr
.ip
), ntohs(cp
->vport
),
1024 ntohl(cp
->daddr
.ip
), ntohs(cp
->dport
),
1025 ip_vs_state_name(cp
->protocol
, cp
->state
),
1026 (cp
->timer
.expires
-jiffies
)/HZ
, pe_data
);
1031 static const struct seq_operations ip_vs_conn_seq_ops
= {
1032 .start
= ip_vs_conn_seq_start
,
1033 .next
= ip_vs_conn_seq_next
,
1034 .stop
= ip_vs_conn_seq_stop
,
1035 .show
= ip_vs_conn_seq_show
,
1038 static int ip_vs_conn_open(struct inode
*inode
, struct file
*file
)
1040 return seq_open_net(inode
, file
, &ip_vs_conn_seq_ops
,
1041 sizeof(struct ip_vs_iter_state
));
1044 static const struct file_operations ip_vs_conn_fops
= {
1045 .owner
= THIS_MODULE
,
1046 .open
= ip_vs_conn_open
,
1048 .llseek
= seq_lseek
,
1049 .release
= seq_release
,
1052 static const char *ip_vs_origin_name(unsigned flags
)
1054 if (flags
& IP_VS_CONN_F_SYNC
)
1060 static int ip_vs_conn_sync_seq_show(struct seq_file
*seq
, void *v
)
1063 if (v
== SEQ_START_TOKEN
)
1065 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
1067 const struct ip_vs_conn
*cp
= v
;
1068 struct net
*net
= seq_file_net(seq
);
1070 if (!ip_vs_conn_net_eq(cp
, net
))
1073 #ifdef CONFIG_IP_VS_IPV6
1074 if (cp
->af
== AF_INET6
)
1075 seq_printf(seq
, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
1076 ip_vs_proto_name(cp
->protocol
),
1077 &cp
->caddr
.in6
, ntohs(cp
->cport
),
1078 &cp
->vaddr
.in6
, ntohs(cp
->vport
),
1079 &cp
->daddr
.in6
, ntohs(cp
->dport
),
1080 ip_vs_state_name(cp
->protocol
, cp
->state
),
1081 ip_vs_origin_name(cp
->flags
),
1082 (cp
->timer
.expires
-jiffies
)/HZ
);
1086 "%-3s %08X %04X %08X %04X "
1087 "%08X %04X %-11s %-6s %7lu\n",
1088 ip_vs_proto_name(cp
->protocol
),
1089 ntohl(cp
->caddr
.ip
), ntohs(cp
->cport
),
1090 ntohl(cp
->vaddr
.ip
), ntohs(cp
->vport
),
1091 ntohl(cp
->daddr
.ip
), ntohs(cp
->dport
),
1092 ip_vs_state_name(cp
->protocol
, cp
->state
),
1093 ip_vs_origin_name(cp
->flags
),
1094 (cp
->timer
.expires
-jiffies
)/HZ
);
1099 static const struct seq_operations ip_vs_conn_sync_seq_ops
= {
1100 .start
= ip_vs_conn_seq_start
,
1101 .next
= ip_vs_conn_seq_next
,
1102 .stop
= ip_vs_conn_seq_stop
,
1103 .show
= ip_vs_conn_sync_seq_show
,
1106 static int ip_vs_conn_sync_open(struct inode
*inode
, struct file
*file
)
1108 return seq_open_net(inode
, file
, &ip_vs_conn_sync_seq_ops
,
1109 sizeof(struct ip_vs_iter_state
));
1112 static const struct file_operations ip_vs_conn_sync_fops
= {
1113 .owner
= THIS_MODULE
,
1114 .open
= ip_vs_conn_sync_open
,
1116 .llseek
= seq_lseek
,
1117 .release
= seq_release
,
1124 * Randomly drop connection entries before running out of memory
1126 static inline int todrop_entry(struct ip_vs_conn
*cp
)
1129 * The drop rate array needs tuning for real environments.
1130 * Called from timer bh only => no locking
1132 static const char todrop_rate
[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
1133 static char todrop_counter
[9] = {0};
1136 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
1137 This will leave enough time for normal connection to get
1139 if (time_before(cp
->timeout
+ jiffies
, cp
->timer
.expires
+ 60*HZ
))
1142 /* Don't drop the entry if its number of incoming packets is not
1143 located in [0, 8] */
1144 i
= atomic_read(&cp
->in_pkts
);
1145 if (i
> 8 || i
< 0) return 0;
1147 if (!todrop_rate
[i
]) return 0;
1148 if (--todrop_counter
[i
] > 0) return 0;
1150 todrop_counter
[i
] = todrop_rate
[i
];
1154 /* Called from keventd and must protect itself from softirqs */
1155 void ip_vs_random_dropentry(struct net
*net
)
1158 struct ip_vs_conn
*cp
;
1161 * Randomly scan 1/32 of the whole table every second
1163 for (idx
= 0; idx
< (ip_vs_conn_tab_size
>>5); idx
++) {
1164 unsigned hash
= net_random() & ip_vs_conn_tab_mask
;
1165 struct hlist_node
*n
;
1168 * Lock is actually needed in this loop.
1170 ct_write_lock_bh(hash
);
1172 hlist_for_each_entry(cp
, n
, &ip_vs_conn_tab
[hash
], c_list
) {
1173 if (cp
->flags
& IP_VS_CONN_F_TEMPLATE
)
1174 /* connection template */
1176 if (!ip_vs_conn_net_eq(cp
, net
))
1178 if (cp
->protocol
== IPPROTO_TCP
) {
1180 case IP_VS_TCP_S_SYN_RECV
:
1181 case IP_VS_TCP_S_SYNACK
:
1184 case IP_VS_TCP_S_ESTABLISHED
:
1185 if (todrop_entry(cp
))
1193 if (!todrop_entry(cp
))
1197 IP_VS_DBG(4, "del connection\n");
1198 ip_vs_conn_expire_now(cp
);
1200 IP_VS_DBG(4, "del conn template\n");
1201 ip_vs_conn_expire_now(cp
->control
);
1204 ct_write_unlock_bh(hash
);
1210 * Flush all the connection entries in the ip_vs_conn_tab
1212 static void ip_vs_conn_flush(struct net
*net
)
1215 struct ip_vs_conn
*cp
;
1216 struct netns_ipvs
*ipvs
= net_ipvs(net
);
1219 for (idx
= 0; idx
< ip_vs_conn_tab_size
; idx
++) {
1220 struct hlist_node
*n
;
1223 * Lock is actually needed in this loop.
1225 ct_write_lock_bh(idx
);
1227 hlist_for_each_entry(cp
, n
, &ip_vs_conn_tab
[idx
], c_list
) {
1228 if (!ip_vs_conn_net_eq(cp
, net
))
1230 IP_VS_DBG(4, "del connection\n");
1231 ip_vs_conn_expire_now(cp
);
1233 IP_VS_DBG(4, "del conn template\n");
1234 ip_vs_conn_expire_now(cp
->control
);
1237 ct_write_unlock_bh(idx
);
1240 /* the counter may be not NULL, because maybe some conn entries
1241 are run by slow timer handler or unhashed but still referred */
1242 if (atomic_read(&ipvs
->conn_count
) != 0) {
1248 * per netns init and exit
1250 int __net_init
__ip_vs_conn_init(struct net
*net
)
1252 struct netns_ipvs
*ipvs
= net_ipvs(net
);
1254 atomic_set(&ipvs
->conn_count
, 0);
1256 proc_net_fops_create(net
, "ip_vs_conn", 0, &ip_vs_conn_fops
);
1257 proc_net_fops_create(net
, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops
);
1261 static void __net_exit
__ip_vs_conn_cleanup(struct net
*net
)
1263 /* flush all the connection entries first */
1264 ip_vs_conn_flush(net
);
1265 proc_net_remove(net
, "ip_vs_conn");
1266 proc_net_remove(net
, "ip_vs_conn_sync");
1268 static struct pernet_operations ipvs_conn_ops
= {
1269 .init
= __ip_vs_conn_init
,
1270 .exit
= __ip_vs_conn_cleanup
,
1273 int __init
ip_vs_conn_init(void)
1278 /* Compute size and mask */
1279 ip_vs_conn_tab_size
= 1 << ip_vs_conn_tab_bits
;
1280 ip_vs_conn_tab_mask
= ip_vs_conn_tab_size
- 1;
1283 * Allocate the connection hash table and initialize its list heads
1285 ip_vs_conn_tab
= vmalloc(ip_vs_conn_tab_size
* sizeof(*ip_vs_conn_tab
));
1286 if (!ip_vs_conn_tab
)
1289 /* Allocate ip_vs_conn slab cache */
1290 ip_vs_conn_cachep
= kmem_cache_create("ip_vs_conn",
1291 sizeof(struct ip_vs_conn
), 0,
1292 SLAB_HWCACHE_ALIGN
, NULL
);
1293 if (!ip_vs_conn_cachep
) {
1294 vfree(ip_vs_conn_tab
);
1298 pr_info("Connection hash table configured "
1299 "(size=%d, memory=%ldKbytes)\n",
1300 ip_vs_conn_tab_size
,
1301 (long)(ip_vs_conn_tab_size
*sizeof(struct list_head
))/1024);
1302 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1303 sizeof(struct ip_vs_conn
));
1305 for (idx
= 0; idx
< ip_vs_conn_tab_size
; idx
++)
1306 INIT_HLIST_HEAD(&ip_vs_conn_tab
[idx
]);
1308 for (idx
= 0; idx
< CT_LOCKARRAY_SIZE
; idx
++) {
1309 rwlock_init(&__ip_vs_conntbl_lock_array
[idx
].l
);
1312 retc
= register_pernet_subsys(&ipvs_conn_ops
);
1314 /* calculate the random value for connection hash */
1315 get_random_bytes(&ip_vs_conn_rnd
, sizeof(ip_vs_conn_rnd
));
1320 void ip_vs_conn_cleanup(void)
1322 unregister_pernet_subsys(&ipvs_conn_ops
);
1323 /* Release the empty cache */
1324 kmem_cache_destroy(ip_vs_conn_cachep
);
1325 vfree(ip_vs_conn_tab
);