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 persistent 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, cp->flags);
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 persistent 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);
781
/* Do not access conntracks during subsys cleanup
782
* because nf_conntrack_find_get can not be used after
783
* conntrack cleanup for the net.
787
ip_vs_conn_drop_conntrack(cp);
790
ip_vs_pe_put(cp->pe);
792
if (unlikely(cp->app != NULL))
793
ip_vs_unbind_app(cp);
794
ip_vs_unbind_dest(cp);
795
if (cp->flags & IP_VS_CONN_F_NO_CPORT)
796
atomic_dec(&ip_vs_conn_no_cport_cnt);
797
atomic_dec(&ipvs->conn_count);
799
kmem_cache_free(ip_vs_conn_cachep, cp);
803
/* hash it back to the table */
807
IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
808
atomic_read(&cp->refcnt)-1,
809
atomic_read(&cp->n_control));
815
void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
817
if (del_timer(&cp->timer))
818
mod_timer(&cp->timer, jiffies);
823
* Create a new connection entry and hash it into the ip_vs_conn_tab
826
ip_vs_conn_new(const struct ip_vs_conn_param *p,
827
const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
828
struct ip_vs_dest *dest, __u32 fwmark)
830
struct ip_vs_conn *cp;
831
struct netns_ipvs *ipvs = net_ipvs(p->net);
832
struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net,
835
cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
837
IP_VS_ERR_RL("%s(): no memory\n", __func__);
841
INIT_HLIST_NODE(&cp->c_list);
842
setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
843
ip_vs_conn_net_set(cp, p->net);
845
cp->protocol = p->protocol;
846
ip_vs_addr_copy(p->af, &cp->caddr, p->caddr);
847
cp->cport = p->cport;
848
ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr);
849
cp->vport = p->vport;
850
/* proto should only be IPPROTO_IP if d_addr is a fwmark */
851
ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
856
if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) {
859
cp->pe_data = p->pe_data;
860
cp->pe_data_len = p->pe_data_len;
862
spin_lock_init(&cp->lock);
865
* Set the entry is referenced by the current thread before hashing
866
* it in the table, so that other thread run ip_vs_random_dropentry
867
* but cannot drop this entry.
869
atomic_set(&cp->refcnt, 1);
871
atomic_set(&cp->n_control, 0);
872
atomic_set(&cp->in_pkts, 0);
874
atomic_inc(&ipvs->conn_count);
875
if (flags & IP_VS_CONN_F_NO_CPORT)
876
atomic_inc(&ip_vs_conn_no_cport_cnt);
878
/* Bind the connection with a destination server */
879
ip_vs_bind_dest(cp, dest);
881
/* Set its state and timeout */
885
/* Bind its packet transmitter */
886
#ifdef CONFIG_IP_VS_IPV6
887
if (p->af == AF_INET6)
888
ip_vs_bind_xmit_v6(cp);
893
if (unlikely(pd && atomic_read(&pd->appcnt)))
894
ip_vs_bind_app(cp, pd->pp);
897
* Allow conntrack to be preserved. By default, conntrack
898
* is created and destroyed for every packet.
899
* Sometimes keeping conntrack can be useful for
900
* IP_VS_CONN_F_ONE_PACKET too.
903
if (ip_vs_conntrack_enabled(ipvs))
904
cp->flags |= IP_VS_CONN_F_NFCT;
906
/* Hash it in the ip_vs_conn_tab finally */
913
* /proc/net/ip_vs_conn entries
915
#ifdef CONFIG_PROC_FS
916
struct ip_vs_iter_state {
917
struct seq_net_private p;
918
struct hlist_head *l;
921
static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
924
struct ip_vs_conn *cp;
925
struct ip_vs_iter_state *iter = seq->private;
926
struct hlist_node *n;
928
for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
929
ct_read_lock_bh(idx);
930
hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
932
iter->l = &ip_vs_conn_tab[idx];
936
ct_read_unlock_bh(idx);
942
static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
944
struct ip_vs_iter_state *iter = seq->private;
947
return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
950
static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
952
struct ip_vs_conn *cp = v;
953
struct ip_vs_iter_state *iter = seq->private;
954
struct hlist_node *e;
955
struct hlist_head *l = iter->l;
959
if (v == SEQ_START_TOKEN)
960
return ip_vs_conn_array(seq, 0);
962
/* more on same hash chain? */
963
if ((e = cp->c_list.next))
964
return hlist_entry(e, struct ip_vs_conn, c_list);
966
idx = l - ip_vs_conn_tab;
967
ct_read_unlock_bh(idx);
969
while (++idx < ip_vs_conn_tab_size) {
970
ct_read_lock_bh(idx);
971
hlist_for_each_entry(cp, e, &ip_vs_conn_tab[idx], c_list) {
972
iter->l = &ip_vs_conn_tab[idx];
975
ct_read_unlock_bh(idx);
981
static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
983
struct ip_vs_iter_state *iter = seq->private;
984
struct hlist_head *l = iter->l;
987
ct_read_unlock_bh(l - ip_vs_conn_tab);
990
static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
993
if (v == SEQ_START_TOKEN)
995
"Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n");
997
const struct ip_vs_conn *cp = v;
998
struct net *net = seq_file_net(seq);
999
char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3];
1002
if (!ip_vs_conn_net_eq(cp, net))
1006
len = strlen(cp->pe->name);
1007
memcpy(pe_data + 1, cp->pe->name, len);
1008
pe_data[len + 1] = ' ';
1010
len += cp->pe->show_pe_data(cp, pe_data + len);
1012
pe_data[len] = '\0';
1014
#ifdef CONFIG_IP_VS_IPV6
1015
if (cp->af == AF_INET6)
1016
seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
1017
"%pI6 %04X %-11s %7lu%s\n",
1018
ip_vs_proto_name(cp->protocol),
1019
&cp->caddr.in6, ntohs(cp->cport),
1020
&cp->vaddr.in6, ntohs(cp->vport),
1021
&cp->daddr.in6, ntohs(cp->dport),
1022
ip_vs_state_name(cp->protocol, cp->state),
1023
(cp->timer.expires-jiffies)/HZ, pe_data);
1027
"%-3s %08X %04X %08X %04X"
1028
" %08X %04X %-11s %7lu%s\n",
1029
ip_vs_proto_name(cp->protocol),
1030
ntohl(cp->caddr.ip), ntohs(cp->cport),
1031
ntohl(cp->vaddr.ip), ntohs(cp->vport),
1032
ntohl(cp->daddr.ip), ntohs(cp->dport),
1033
ip_vs_state_name(cp->protocol, cp->state),
1034
(cp->timer.expires-jiffies)/HZ, pe_data);
1039
static const struct seq_operations ip_vs_conn_seq_ops = {
1040
.start = ip_vs_conn_seq_start,
1041
.next = ip_vs_conn_seq_next,
1042
.stop = ip_vs_conn_seq_stop,
1043
.show = ip_vs_conn_seq_show,
1046
static int ip_vs_conn_open(struct inode *inode, struct file *file)
1048
return seq_open_net(inode, file, &ip_vs_conn_seq_ops,
1049
sizeof(struct ip_vs_iter_state));
1052
static const struct file_operations ip_vs_conn_fops = {
1053
.owner = THIS_MODULE,
1054
.open = ip_vs_conn_open,
1056
.llseek = seq_lseek,
1057
.release = seq_release_net,
1060
static const char *ip_vs_origin_name(unsigned flags)
1062
if (flags & IP_VS_CONN_F_SYNC)
1068
static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
1071
if (v == SEQ_START_TOKEN)
1073
"Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
1075
const struct ip_vs_conn *cp = v;
1076
struct net *net = seq_file_net(seq);
1078
if (!ip_vs_conn_net_eq(cp, net))
1081
#ifdef CONFIG_IP_VS_IPV6
1082
if (cp->af == AF_INET6)
1083
seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
1084
ip_vs_proto_name(cp->protocol),
1085
&cp->caddr.in6, ntohs(cp->cport),
1086
&cp->vaddr.in6, ntohs(cp->vport),
1087
&cp->daddr.in6, ntohs(cp->dport),
1088
ip_vs_state_name(cp->protocol, cp->state),
1089
ip_vs_origin_name(cp->flags),
1090
(cp->timer.expires-jiffies)/HZ);
1094
"%-3s %08X %04X %08X %04X "
1095
"%08X %04X %-11s %-6s %7lu\n",
1096
ip_vs_proto_name(cp->protocol),
1097
ntohl(cp->caddr.ip), ntohs(cp->cport),
1098
ntohl(cp->vaddr.ip), ntohs(cp->vport),
1099
ntohl(cp->daddr.ip), ntohs(cp->dport),
1100
ip_vs_state_name(cp->protocol, cp->state),
1101
ip_vs_origin_name(cp->flags),
1102
(cp->timer.expires-jiffies)/HZ);
1107
static const struct seq_operations ip_vs_conn_sync_seq_ops = {
1108
.start = ip_vs_conn_seq_start,
1109
.next = ip_vs_conn_seq_next,
1110
.stop = ip_vs_conn_seq_stop,
1111
.show = ip_vs_conn_sync_seq_show,
1114
static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
1116
return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops,
1117
sizeof(struct ip_vs_iter_state));
1120
static const struct file_operations ip_vs_conn_sync_fops = {
1121
.owner = THIS_MODULE,
1122
.open = ip_vs_conn_sync_open,
1124
.llseek = seq_lseek,
1125
.release = seq_release_net,
1132
* Randomly drop connection entries before running out of memory
1134
static inline int todrop_entry(struct ip_vs_conn *cp)
1137
* The drop rate array needs tuning for real environments.
1138
* Called from timer bh only => no locking
1140
static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
1141
static char todrop_counter[9] = {0};
1144
/* if the conn entry hasn't lasted for 60 seconds, don't drop it.
1145
This will leave enough time for normal connection to get
1147
if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
1150
/* Don't drop the entry if its number of incoming packets is not
1151
located in [0, 8] */
1152
i = atomic_read(&cp->in_pkts);
1153
if (i > 8 || i < 0) return 0;
1155
if (!todrop_rate[i]) return 0;
1156
if (--todrop_counter[i] > 0) return 0;
1158
todrop_counter[i] = todrop_rate[i];
1162
/* Called from keventd and must protect itself from softirqs */
1163
void ip_vs_random_dropentry(struct net *net)
1166
struct ip_vs_conn *cp;
1169
* Randomly scan 1/32 of the whole table every second
1171
for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) {
1172
unsigned hash = net_random() & ip_vs_conn_tab_mask;
1173
struct hlist_node *n;
1176
* Lock is actually needed in this loop.
1178
ct_write_lock_bh(hash);
1180
hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
1181
if (cp->flags & IP_VS_CONN_F_TEMPLATE)
1182
/* connection template */
1184
if (!ip_vs_conn_net_eq(cp, net))
1186
if (cp->protocol == IPPROTO_TCP) {
1188
case IP_VS_TCP_S_SYN_RECV:
1189
case IP_VS_TCP_S_SYNACK:
1192
case IP_VS_TCP_S_ESTABLISHED:
1193
if (todrop_entry(cp))
1201
if (!todrop_entry(cp))
1205
IP_VS_DBG(4, "del connection\n");
1206
ip_vs_conn_expire_now(cp);
1208
IP_VS_DBG(4, "del conn template\n");
1209
ip_vs_conn_expire_now(cp->control);
1212
ct_write_unlock_bh(hash);
1218
* Flush all the connection entries in the ip_vs_conn_tab
1220
static void ip_vs_conn_flush(struct net *net)
1223
struct ip_vs_conn *cp;
1224
struct netns_ipvs *ipvs = net_ipvs(net);
1227
for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
1228
struct hlist_node *n;
1231
* Lock is actually needed in this loop.
1233
ct_write_lock_bh(idx);
1235
hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
1236
if (!ip_vs_conn_net_eq(cp, net))
1238
IP_VS_DBG(4, "del connection\n");
1239
ip_vs_conn_expire_now(cp);
1241
IP_VS_DBG(4, "del conn template\n");
1242
ip_vs_conn_expire_now(cp->control);
1245
ct_write_unlock_bh(idx);
1248
/* the counter may be not NULL, because maybe some conn entries
1249
are run by slow timer handler or unhashed but still referred */
1250
if (atomic_read(&ipvs->conn_count) != 0) {
1256
* per netns init and exit
1258
int __net_init ip_vs_conn_net_init(struct net *net)
1260
struct netns_ipvs *ipvs = net_ipvs(net);
1262
atomic_set(&ipvs->conn_count, 0);
1264
proc_net_fops_create(net, "ip_vs_conn", 0, &ip_vs_conn_fops);
1265
proc_net_fops_create(net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops);
1269
void __net_exit ip_vs_conn_net_cleanup(struct net *net)
1271
/* flush all the connection entries first */
1272
ip_vs_conn_flush(net);
1273
proc_net_remove(net, "ip_vs_conn");
1274
proc_net_remove(net, "ip_vs_conn_sync");
1277
int __init ip_vs_conn_init(void)
1281
/* Compute size and mask */
1282
ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits;
1283
ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1;
1286
* Allocate the connection hash table and initialize its list heads
1288
ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab));
1289
if (!ip_vs_conn_tab)
1292
/* Allocate ip_vs_conn slab cache */
1293
ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
1294
sizeof(struct ip_vs_conn), 0,
1295
SLAB_HWCACHE_ALIGN, NULL);
1296
if (!ip_vs_conn_cachep) {
1297
vfree(ip_vs_conn_tab);
1301
pr_info("Connection hash table configured "
1302
"(size=%d, memory=%ldKbytes)\n",
1303
ip_vs_conn_tab_size,
1304
(long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024);
1305
IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1306
sizeof(struct ip_vs_conn));
1308
for (idx = 0; idx < ip_vs_conn_tab_size; idx++)
1309
INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]);
1311
for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
1312
rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
1315
/* calculate the random value for connection hash */
1316
get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
1321
void ip_vs_conn_cleanup(void)
1323
/* Release the empty cache */
1324
kmem_cache_destroy(ip_vs_conn_cachep);
1325
vfree(ip_vs_conn_tab);