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1/*
2 * IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
8
9#include <linux/ip_vs.h> /* definitions shared with userland */
10
11#include <asm/types.h> /* for __uXX types */
12
13#include <linux/sysctl.h> /* for ctl_path */
14#include <linux/list.h> /* for struct list_head */
15#include <linux/spinlock.h> /* for struct rwlock_t */
16#include <linux/atomic.h> /* for struct atomic_t */
17#include <linux/compiler.h>
18#include <linux/timer.h>
19
20#include <net/checksum.h>
21#include <linux/netfilter.h> /* for union nf_inet_addr */
22#include <linux/ip.h>
23#include <linux/ipv6.h> /* for struct ipv6hdr */
24#include <net/ipv6.h> /* for ipv6_addr_copy */
25#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
26#include <net/netfilter/nf_conntrack.h>
27#endif
28#include <net/net_namespace.h> /* Netw namespace */
29
30/*
31 * Generic access of ipvs struct
32 */
33static inline struct netns_ipvs *net_ipvs(struct net* net)
34{
35 return net->ipvs;
36}
37/*
38 * Get net ptr from skb in traffic cases
39 * use skb_sknet when call is from userland (ioctl or netlink)
40 */
41static inline struct net *skb_net(const struct sk_buff *skb)
42{
43#ifdef CONFIG_NET_NS
44#ifdef CONFIG_IP_VS_DEBUG
45 /*
46 * This is used for debug only.
47 * Start with the most likely hit
48 * End with BUG
49 */
50 if (likely(skb->dev && skb->dev->nd_net))
51 return dev_net(skb->dev);
52 if (skb_dst(skb) && skb_dst(skb)->dev)
53 return dev_net(skb_dst(skb)->dev);
54 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
55 __func__, __LINE__);
56 if (likely(skb->sk && skb->sk->sk_net))
57 return sock_net(skb->sk);
58 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
59 __func__, __LINE__);
60 BUG();
61#else
62 return dev_net(skb->dev ? : skb_dst(skb)->dev);
63#endif
64#else
65 return &init_net;
66#endif
67}
68
69static inline struct net *skb_sknet(const struct sk_buff *skb)
70{
71#ifdef CONFIG_NET_NS
72#ifdef CONFIG_IP_VS_DEBUG
73 /* Start with the most likely hit */
74 if (likely(skb->sk && skb->sk->sk_net))
75 return sock_net(skb->sk);
76 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
77 __func__, __LINE__);
78 if (likely(skb->dev && skb->dev->nd_net))
79 return dev_net(skb->dev);
80 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
81 __func__, __LINE__);
82 BUG();
83#else
84 return sock_net(skb->sk);
85#endif
86#else
87 return &init_net;
88#endif
89}
90/*
91 * This one needed for single_open_net since net is stored directly in
92 * private not as a struct i.e. seq_file_net can't be used.
93 */
94static inline struct net *seq_file_single_net(struct seq_file *seq)
95{
96#ifdef CONFIG_NET_NS
97 return (struct net *)seq->private;
98#else
99 return &init_net;
100#endif
101}
102
103/* Connections' size value needed by ip_vs_ctl.c */
104extern int ip_vs_conn_tab_size;
105
106
107struct ip_vs_iphdr {
108 int len;
109 __u8 protocol;
110 union nf_inet_addr saddr;
111 union nf_inet_addr daddr;
112};
113
114static inline void
115ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
116{
117#ifdef CONFIG_IP_VS_IPV6
118 if (af == AF_INET6) {
119 const struct ipv6hdr *iph = nh;
120 iphdr->len = sizeof(struct ipv6hdr);
121 iphdr->protocol = iph->nexthdr;
122 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
123 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
124 } else
125#endif
126 {
127 const struct iphdr *iph = nh;
128 iphdr->len = iph->ihl * 4;
129 iphdr->protocol = iph->protocol;
130 iphdr->saddr.ip = iph->saddr;
131 iphdr->daddr.ip = iph->daddr;
132 }
133}
134
135static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
136 const union nf_inet_addr *src)
137{
138#ifdef CONFIG_IP_VS_IPV6
139 if (af == AF_INET6)
140 ipv6_addr_copy(&dst->in6, &src->in6);
141 else
142#endif
143 dst->ip = src->ip;
144}
145
146static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
147 const union nf_inet_addr *b)
148{
149#ifdef CONFIG_IP_VS_IPV6
150 if (af == AF_INET6)
151 return ipv6_addr_equal(&a->in6, &b->in6);
152#endif
153 return a->ip == b->ip;
154}
155
156#ifdef CONFIG_IP_VS_DEBUG
157#include <linux/net.h>
158
159extern int ip_vs_get_debug_level(void);
160
161static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
162 const union nf_inet_addr *addr,
163 int *idx)
164{
165 int len;
166#ifdef CONFIG_IP_VS_IPV6
167 if (af == AF_INET6)
168 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
169 &addr->in6) + 1;
170 else
171#endif
172 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
173 &addr->ip) + 1;
174
175 *idx += len;
176 BUG_ON(*idx > buf_len + 1);
177 return &buf[*idx - len];
178}
179
180#define IP_VS_DBG_BUF(level, msg, ...) \
181 do { \
182 char ip_vs_dbg_buf[160]; \
183 int ip_vs_dbg_idx = 0; \
184 if (level <= ip_vs_get_debug_level()) \
185 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
186 } while (0)
187#define IP_VS_ERR_BUF(msg...) \
188 do { \
189 char ip_vs_dbg_buf[160]; \
190 int ip_vs_dbg_idx = 0; \
191 pr_err(msg); \
192 } while (0)
193
194/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
195#define IP_VS_DBG_ADDR(af, addr) \
196 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
197 sizeof(ip_vs_dbg_buf), addr, \
198 &ip_vs_dbg_idx)
199
200#define IP_VS_DBG(level, msg, ...) \
201 do { \
202 if (level <= ip_vs_get_debug_level()) \
203 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
204 } while (0)
205#define IP_VS_DBG_RL(msg, ...) \
206 do { \
207 if (net_ratelimit()) \
208 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
209 } while (0)
210#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
211 do { \
212 if (level <= ip_vs_get_debug_level()) \
213 pp->debug_packet(af, pp, skb, ofs, msg); \
214 } while (0)
215#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
216 do { \
217 if (level <= ip_vs_get_debug_level() && \
218 net_ratelimit()) \
219 pp->debug_packet(af, pp, skb, ofs, msg); \
220 } while (0)
221#else /* NO DEBUGGING at ALL */
222#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
223#define IP_VS_ERR_BUF(msg...) do {} while (0)
224#define IP_VS_DBG(level, msg...) do {} while (0)
225#define IP_VS_DBG_RL(msg...) do {} while (0)
226#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
227#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
228#endif
229
230#define IP_VS_BUG() BUG()
231#define IP_VS_ERR_RL(msg, ...) \
232 do { \
233 if (net_ratelimit()) \
234 pr_err(msg, ##__VA_ARGS__); \
235 } while (0)
236
237#ifdef CONFIG_IP_VS_DEBUG
238#define EnterFunction(level) \
239 do { \
240 if (level <= ip_vs_get_debug_level()) \
241 printk(KERN_DEBUG \
242 pr_fmt("Enter: %s, %s line %i\n"), \
243 __func__, __FILE__, __LINE__); \
244 } while (0)
245#define LeaveFunction(level) \
246 do { \
247 if (level <= ip_vs_get_debug_level()) \
248 printk(KERN_DEBUG \
249 pr_fmt("Leave: %s, %s line %i\n"), \
250 __func__, __FILE__, __LINE__); \
251 } while (0)
252#else
253#define EnterFunction(level) do {} while (0)
254#define LeaveFunction(level) do {} while (0)
255#endif
256
257#define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
258
259
260/*
261 * The port number of FTP service (in network order).
262 */
263#define FTPPORT cpu_to_be16(21)
264#define FTPDATA cpu_to_be16(20)
265
266/*
267 * TCP State Values
268 */
269enum {
270 IP_VS_TCP_S_NONE = 0,
271 IP_VS_TCP_S_ESTABLISHED,
272 IP_VS_TCP_S_SYN_SENT,
273 IP_VS_TCP_S_SYN_RECV,
274 IP_VS_TCP_S_FIN_WAIT,
275 IP_VS_TCP_S_TIME_WAIT,
276 IP_VS_TCP_S_CLOSE,
277 IP_VS_TCP_S_CLOSE_WAIT,
278 IP_VS_TCP_S_LAST_ACK,
279 IP_VS_TCP_S_LISTEN,
280 IP_VS_TCP_S_SYNACK,
281 IP_VS_TCP_S_LAST
282};
283
284/*
285 * UDP State Values
286 */
287enum {
288 IP_VS_UDP_S_NORMAL,
289 IP_VS_UDP_S_LAST,
290};
291
292/*
293 * ICMP State Values
294 */
295enum {
296 IP_VS_ICMP_S_NORMAL,
297 IP_VS_ICMP_S_LAST,
298};
299
300/*
301 * SCTP State Values
302 */
303enum ip_vs_sctp_states {
304 IP_VS_SCTP_S_NONE,
305 IP_VS_SCTP_S_INIT_CLI,
306 IP_VS_SCTP_S_INIT_SER,
307 IP_VS_SCTP_S_INIT_ACK_CLI,
308 IP_VS_SCTP_S_INIT_ACK_SER,
309 IP_VS_SCTP_S_ECHO_CLI,
310 IP_VS_SCTP_S_ECHO_SER,
311 IP_VS_SCTP_S_ESTABLISHED,
312 IP_VS_SCTP_S_SHUT_CLI,
313 IP_VS_SCTP_S_SHUT_SER,
314 IP_VS_SCTP_S_SHUT_ACK_CLI,
315 IP_VS_SCTP_S_SHUT_ACK_SER,
316 IP_VS_SCTP_S_CLOSED,
317 IP_VS_SCTP_S_LAST
318};
319
320/*
321 * Delta sequence info structure
322 * Each ip_vs_conn has 2 (output AND input seq. changes).
323 * Only used in the VS/NAT.
324 */
325struct ip_vs_seq {
326 __u32 init_seq; /* Add delta from this seq */
327 __u32 delta; /* Delta in sequence numbers */
328 __u32 previous_delta; /* Delta in sequence numbers
329 before last resized pkt */
330};
331
332/*
333 * counters per cpu
334 */
335struct ip_vs_counters {
336 __u32 conns; /* connections scheduled */
337 __u32 inpkts; /* incoming packets */
338 __u32 outpkts; /* outgoing packets */
339 __u64 inbytes; /* incoming bytes */
340 __u64 outbytes; /* outgoing bytes */
341};
342/*
343 * Stats per cpu
344 */
345struct ip_vs_cpu_stats {
346 struct ip_vs_counters ustats;
347 struct u64_stats_sync syncp;
348};
349
350/*
351 * IPVS statistics objects
352 */
353struct ip_vs_estimator {
354 struct list_head list;
355
356 u64 last_inbytes;
357 u64 last_outbytes;
358 u32 last_conns;
359 u32 last_inpkts;
360 u32 last_outpkts;
361
362 u32 cps;
363 u32 inpps;
364 u32 outpps;
365 u32 inbps;
366 u32 outbps;
367};
368
369struct ip_vs_stats {
370 struct ip_vs_stats_user ustats; /* statistics */
371 struct ip_vs_estimator est; /* estimator */
372 struct ip_vs_cpu_stats *cpustats; /* per cpu counters */
373 spinlock_t lock; /* spin lock */
374 struct ip_vs_stats_user ustats0; /* reset values */
375};
376
377struct dst_entry;
378struct iphdr;
379struct ip_vs_conn;
380struct ip_vs_app;
381struct sk_buff;
382struct ip_vs_proto_data;
383
384struct ip_vs_protocol {
385 struct ip_vs_protocol *next;
386 char *name;
387 u16 protocol;
388 u16 num_states;
389 int dont_defrag;
390
391 void (*init)(struct ip_vs_protocol *pp);
392
393 void (*exit)(struct ip_vs_protocol *pp);
394
395 void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
396
397 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
398
399 int (*conn_schedule)(int af, struct sk_buff *skb,
400 struct ip_vs_proto_data *pd,
401 int *verdict, struct ip_vs_conn **cpp);
402
403 struct ip_vs_conn *
404 (*conn_in_get)(int af,
405 const struct sk_buff *skb,
406 const struct ip_vs_iphdr *iph,
407 unsigned int proto_off,
408 int inverse);
409
410 struct ip_vs_conn *
411 (*conn_out_get)(int af,
412 const struct sk_buff *skb,
413 const struct ip_vs_iphdr *iph,
414 unsigned int proto_off,
415 int inverse);
416
417 int (*snat_handler)(struct sk_buff *skb,
418 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
419
420 int (*dnat_handler)(struct sk_buff *skb,
421 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
422
423 int (*csum_check)(int af, struct sk_buff *skb,
424 struct ip_vs_protocol *pp);
425
426 const char *(*state_name)(int state);
427
428 int (*state_transition)(struct ip_vs_conn *cp, int direction,
429 const struct sk_buff *skb,
430 struct ip_vs_proto_data *pd);
431
432 int (*register_app)(struct net *net, struct ip_vs_app *inc);
433
434 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
435
436 int (*app_conn_bind)(struct ip_vs_conn *cp);
437
438 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
439 const struct sk_buff *skb,
440 int offset,
441 const char *msg);
442
443 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
444};
445
446/*
447 * protocol data per netns
448 */
449struct ip_vs_proto_data {
450 struct ip_vs_proto_data *next;
451 struct ip_vs_protocol *pp;
452 int *timeout_table; /* protocol timeout table */
453 atomic_t appcnt; /* counter of proto app incs. */
454 struct tcp_states_t *tcp_state_table;
455};
456
457extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
458extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
459 unsigned short proto);
460
461struct ip_vs_conn_param {
462 struct net *net;
463 const union nf_inet_addr *caddr;
464 const union nf_inet_addr *vaddr;
465 __be16 cport;
466 __be16 vport;
467 __u16 protocol;
468 u16 af;
469
470 const struct ip_vs_pe *pe;
471 char *pe_data;
472 __u8 pe_data_len;
473};
474
475/*
476 * IP_VS structure allocated for each dynamically scheduled connection
477 */
478struct ip_vs_conn {
479 struct hlist_node c_list; /* hashed list heads */
480#ifdef CONFIG_NET_NS
481 struct net *net; /* Name space */
482#endif
483 /* Protocol, addresses and port numbers */
484 u16 af; /* address family */
485 __be16 cport;
486 __be16 vport;
487 __be16 dport;
488 __u32 fwmark; /* Fire wall mark from skb */
489 union nf_inet_addr caddr; /* client address */
490 union nf_inet_addr vaddr; /* virtual address */
491 union nf_inet_addr daddr; /* destination address */
492 volatile __u32 flags; /* status flags */
493 __u16 protocol; /* Which protocol (TCP/UDP) */
494
495 /* counter and timer */
496 atomic_t refcnt; /* reference count */
497 struct timer_list timer; /* Expiration timer */
498 volatile unsigned long timeout; /* timeout */
499
500 /* Flags and state transition */
501 spinlock_t lock; /* lock for state transition */
502 volatile __u16 state; /* state info */
503 volatile __u16 old_state; /* old state, to be used for
504 * state transition triggerd
505 * synchronization
506 */
507
508 /* Control members */
509 struct ip_vs_conn *control; /* Master control connection */
510 atomic_t n_control; /* Number of controlled ones */
511 struct ip_vs_dest *dest; /* real server */
512 atomic_t in_pkts; /* incoming packet counter */
513
514 /* packet transmitter for different forwarding methods. If it
515 mangles the packet, it must return NF_DROP or better NF_STOLEN,
516 otherwise this must be changed to a sk_buff **.
517 NF_ACCEPT can be returned when destination is local.
518 */
519 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
520 struct ip_vs_protocol *pp);
521
522 /* Note: we can group the following members into a structure,
523 in order to save more space, and the following members are
524 only used in VS/NAT anyway */
525 struct ip_vs_app *app; /* bound ip_vs_app object */
526 void *app_data; /* Application private data */
527 struct ip_vs_seq in_seq; /* incoming seq. struct */
528 struct ip_vs_seq out_seq; /* outgoing seq. struct */
529
530 const struct ip_vs_pe *pe;
531 char *pe_data;
532 __u8 pe_data_len;
533};
534
535/*
536 * To save some memory in conn table when name space is disabled.
537 */
538static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
539{
540#ifdef CONFIG_NET_NS
541 return cp->net;
542#else
543 return &init_net;
544#endif
545}
546static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
547{
548#ifdef CONFIG_NET_NS
549 cp->net = net;
550#endif
551}
552
553static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
554 struct net *net)
555{
556#ifdef CONFIG_NET_NS
557 return cp->net == net;
558#else
559 return 1;
560#endif
561}
562
563/*
564 * Extended internal versions of struct ip_vs_service_user and
565 * ip_vs_dest_user for IPv6 support.
566 *
567 * We need these to conveniently pass around service and destination
568 * options, but unfortunately, we also need to keep the old definitions to
569 * maintain userspace backwards compatibility for the setsockopt interface.
570 */
571struct ip_vs_service_user_kern {
572 /* virtual service addresses */
573 u16 af;
574 u16 protocol;
575 union nf_inet_addr addr; /* virtual ip address */
576 u16 port;
577 u32 fwmark; /* firwall mark of service */
578
579 /* virtual service options */
580 char *sched_name;
581 char *pe_name;
582 unsigned flags; /* virtual service flags */
583 unsigned timeout; /* persistent timeout in sec */
584 u32 netmask; /* persistent netmask */
585};
586
587
588struct ip_vs_dest_user_kern {
589 /* destination server address */
590 union nf_inet_addr addr;
591 u16 port;
592
593 /* real server options */
594 unsigned conn_flags; /* connection flags */
595 int weight; /* destination weight */
596
597 /* thresholds for active connections */
598 u32 u_threshold; /* upper threshold */
599 u32 l_threshold; /* lower threshold */
600};
601
602
603/*
604 * The information about the virtual service offered to the net
605 * and the forwarding entries
606 */
607struct ip_vs_service {
608 struct list_head s_list; /* for normal service table */
609 struct list_head f_list; /* for fwmark-based service table */
610 atomic_t refcnt; /* reference counter */
611 atomic_t usecnt; /* use counter */
612
613 u16 af; /* address family */
614 __u16 protocol; /* which protocol (TCP/UDP) */
615 union nf_inet_addr addr; /* IP address for virtual service */
616 __be16 port; /* port number for the service */
617 __u32 fwmark; /* firewall mark of the service */
618 unsigned flags; /* service status flags */
619 unsigned timeout; /* persistent timeout in ticks */
620 __be32 netmask; /* grouping granularity */
621 struct net *net;
622
623 struct list_head destinations; /* real server d-linked list */
624 __u32 num_dests; /* number of servers */
625 struct ip_vs_stats stats; /* statistics for the service */
626 struct ip_vs_app *inc; /* bind conns to this app inc */
627
628 /* for scheduling */
629 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
630 rwlock_t sched_lock; /* lock sched_data */
631 void *sched_data; /* scheduler application data */
632
633 /* alternate persistence engine */
634 struct ip_vs_pe *pe;
635};
636
637
638/*
639 * The real server destination forwarding entry
640 * with ip address, port number, and so on.
641 */
642struct ip_vs_dest {
643 struct list_head n_list; /* for the dests in the service */
644 struct list_head d_list; /* for table with all the dests */
645
646 u16 af; /* address family */
647 __be16 port; /* port number of the server */
648 union nf_inet_addr addr; /* IP address of the server */
649 volatile unsigned flags; /* dest status flags */
650 atomic_t conn_flags; /* flags to copy to conn */
651 atomic_t weight; /* server weight */
652
653 atomic_t refcnt; /* reference counter */
654 struct ip_vs_stats stats; /* statistics */
655
656 /* connection counters and thresholds */
657 atomic_t activeconns; /* active connections */
658 atomic_t inactconns; /* inactive connections */
659 atomic_t persistconns; /* persistent connections */
660 __u32 u_threshold; /* upper threshold */
661 __u32 l_threshold; /* lower threshold */
662
663 /* for destination cache */
664 spinlock_t dst_lock; /* lock of dst_cache */
665 struct dst_entry *dst_cache; /* destination cache entry */
666 u32 dst_rtos; /* RT_TOS(tos) for dst */
667 u32 dst_cookie;
668 union nf_inet_addr dst_saddr;
669
670 /* for virtual service */
671 struct ip_vs_service *svc; /* service it belongs to */
672 __u16 protocol; /* which protocol (TCP/UDP) */
673 __be16 vport; /* virtual port number */
674 union nf_inet_addr vaddr; /* virtual IP address */
675 __u32 vfwmark; /* firewall mark of service */
676};
677
678
679/*
680 * The scheduler object
681 */
682struct ip_vs_scheduler {
683 struct list_head n_list; /* d-linked list head */
684 char *name; /* scheduler name */
685 atomic_t refcnt; /* reference counter */
686 struct module *module; /* THIS_MODULE/NULL */
687
688 /* scheduler initializing service */
689 int (*init_service)(struct ip_vs_service *svc);
690 /* scheduling service finish */
691 int (*done_service)(struct ip_vs_service *svc);
692 /* scheduler updating service */
693 int (*update_service)(struct ip_vs_service *svc);
694
695 /* selecting a server from the given service */
696 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
697 const struct sk_buff *skb);
698};
699
700/* The persistence engine object */
701struct ip_vs_pe {
702 struct list_head n_list; /* d-linked list head */
703 char *name; /* scheduler name */
704 atomic_t refcnt; /* reference counter */
705 struct module *module; /* THIS_MODULE/NULL */
706
707 /* get the connection template, if any */
708 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
709 bool (*ct_match)(const struct ip_vs_conn_param *p,
710 struct ip_vs_conn *ct);
711 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
712 bool inverse);
713 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
714};
715
716/*
717 * The application module object (a.k.a. app incarnation)
718 */
719struct ip_vs_app {
720 struct list_head a_list; /* member in app list */
721 int type; /* IP_VS_APP_TYPE_xxx */
722 char *name; /* application module name */
723 __u16 protocol;
724 struct module *module; /* THIS_MODULE/NULL */
725 struct list_head incs_list; /* list of incarnations */
726
727 /* members for application incarnations */
728 struct list_head p_list; /* member in proto app list */
729 struct ip_vs_app *app; /* its real application */
730 __be16 port; /* port number in net order */
731 atomic_t usecnt; /* usage counter */
732
733 /*
734 * output hook: Process packet in inout direction, diff set for TCP.
735 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
736 * 2=Mangled but checksum was not updated
737 */
738 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
739 struct sk_buff *, int *diff);
740
741 /*
742 * input hook: Process packet in outin direction, diff set for TCP.
743 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
744 * 2=Mangled but checksum was not updated
745 */
746 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
747 struct sk_buff *, int *diff);
748
749 /* ip_vs_app initializer */
750 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
751
752 /* ip_vs_app finish */
753 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
754
755
756 /* not used now */
757 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
758 struct ip_vs_protocol *);
759
760 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
761
762 int * timeout_table;
763 int * timeouts;
764 int timeouts_size;
765
766 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
767 int *verdict, struct ip_vs_conn **cpp);
768
769 struct ip_vs_conn *
770 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
771 const struct iphdr *iph, unsigned int proto_off,
772 int inverse);
773
774 struct ip_vs_conn *
775 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
776 const struct iphdr *iph, unsigned int proto_off,
777 int inverse);
778
779 int (*state_transition)(struct ip_vs_conn *cp, int direction,
780 const struct sk_buff *skb,
781 struct ip_vs_app *app);
782
783 void (*timeout_change)(struct ip_vs_app *app, int flags);
784};
785
786/* IPVS in network namespace */
787struct netns_ipvs {
788 int gen; /* Generation */
789 int enable; /* enable like nf_hooks do */
790 /*
791 * Hash table: for real service lookups
792 */
793 #define IP_VS_RTAB_BITS 4
794 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
795 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
796
797 struct list_head rs_table[IP_VS_RTAB_SIZE];
798 /* ip_vs_app */
799 struct list_head app_list;
800 /* ip_vs_ftp */
801 struct ip_vs_app *ftp_app;
802 /* ip_vs_proto */
803 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
804 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
805 /* ip_vs_proto_tcp */
806#ifdef CONFIG_IP_VS_PROTO_TCP
807 #define TCP_APP_TAB_BITS 4
808 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
809 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
810 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
811 spinlock_t tcp_app_lock;
812#endif
813 /* ip_vs_proto_udp */
814#ifdef CONFIG_IP_VS_PROTO_UDP
815 #define UDP_APP_TAB_BITS 4
816 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
817 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
818 struct list_head udp_apps[UDP_APP_TAB_SIZE];
819 spinlock_t udp_app_lock;
820#endif
821 /* ip_vs_proto_sctp */
822#ifdef CONFIG_IP_VS_PROTO_SCTP
823 #define SCTP_APP_TAB_BITS 4
824 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
825 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
826 /* Hash table for SCTP application incarnations */
827 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
828 spinlock_t sctp_app_lock;
829#endif
830 /* ip_vs_conn */
831 atomic_t conn_count; /* connection counter */
832
833 /* ip_vs_ctl */
834 struct ip_vs_stats tot_stats; /* Statistics & est. */
835
836 int num_services; /* no of virtual services */
837
838 rwlock_t rs_lock; /* real services table */
839 /* Trash for destinations */
840 struct list_head dest_trash;
841 /* Service counters */
842 atomic_t ftpsvc_counter;
843 atomic_t nullsvc_counter;
844
845#ifdef CONFIG_SYSCTL
846 /* 1/rate drop and drop-entry variables */
847 struct delayed_work defense_work; /* Work handler */
848 int drop_rate;
849 int drop_counter;
850 atomic_t dropentry;
851 /* locks in ctl.c */
852 spinlock_t dropentry_lock; /* drop entry handling */
853 spinlock_t droppacket_lock; /* drop packet handling */
854 spinlock_t securetcp_lock; /* state and timeout tables */
855
856 /* sys-ctl struct */
857 struct ctl_table_header *sysctl_hdr;
858 struct ctl_table *sysctl_tbl;
859#endif
860
861 /* sysctl variables */
862 int sysctl_amemthresh;
863 int sysctl_am_droprate;
864 int sysctl_drop_entry;
865 int sysctl_drop_packet;
866 int sysctl_secure_tcp;
867#ifdef CONFIG_IP_VS_NFCT
868 int sysctl_conntrack;
869#endif
870 int sysctl_snat_reroute;
871 int sysctl_sync_ver;
872 int sysctl_cache_bypass;
873 int sysctl_expire_nodest_conn;
874 int sysctl_expire_quiescent_template;
875 int sysctl_sync_threshold[2];
876 int sysctl_nat_icmp_send;
877
878 /* ip_vs_lblc */
879 int sysctl_lblc_expiration;
880 struct ctl_table_header *lblc_ctl_header;
881 struct ctl_table *lblc_ctl_table;
882 /* ip_vs_lblcr */
883 int sysctl_lblcr_expiration;
884 struct ctl_table_header *lblcr_ctl_header;
885 struct ctl_table *lblcr_ctl_table;
886 /* ip_vs_est */
887 struct list_head est_list; /* estimator list */
888 spinlock_t est_lock;
889 struct timer_list est_timer; /* Estimation timer */
890 /* ip_vs_sync */
891 struct list_head sync_queue;
892 spinlock_t sync_lock;
893 struct ip_vs_sync_buff *sync_buff;
894 spinlock_t sync_buff_lock;
895 struct sockaddr_in sync_mcast_addr;
896 struct task_struct *master_thread;
897 struct task_struct *backup_thread;
898 int send_mesg_maxlen;
899 int recv_mesg_maxlen;
900 volatile int sync_state;
901 volatile int master_syncid;
902 volatile int backup_syncid;
903 struct mutex sync_mutex;
904 /* multicast interface name */
905 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
906 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
907 /* net name space ptr */
908 struct net *net; /* Needed by timer routines */
909};
910
911#define DEFAULT_SYNC_THRESHOLD 3
912#define DEFAULT_SYNC_PERIOD 50
913#define DEFAULT_SYNC_VER 1
914
915#ifdef CONFIG_SYSCTL
916
917static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
918{
919 return ipvs->sysctl_sync_threshold[0];
920}
921
922static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
923{
924 return ipvs->sysctl_sync_threshold[1];
925}
926
927static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
928{
929 return ipvs->sysctl_sync_ver;
930}
931
932#else
933
934static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
935{
936 return DEFAULT_SYNC_THRESHOLD;
937}
938
939static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
940{
941 return DEFAULT_SYNC_PERIOD;
942}
943
944static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
945{
946 return DEFAULT_SYNC_VER;
947}
948
949#endif
950
951/*
952 * IPVS core functions
953 * (from ip_vs_core.c)
954 */
955extern const char *ip_vs_proto_name(unsigned proto);
956extern void ip_vs_init_hash_table(struct list_head *table, int rows);
957#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
958
959#define IP_VS_APP_TYPE_FTP 1
960
961/*
962 * ip_vs_conn handling functions
963 * (from ip_vs_conn.c)
964 */
965
966enum {
967 IP_VS_DIR_INPUT = 0,
968 IP_VS_DIR_OUTPUT,
969 IP_VS_DIR_INPUT_ONLY,
970 IP_VS_DIR_LAST,
971};
972
973static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
974 const union nf_inet_addr *caddr,
975 __be16 cport,
976 const union nf_inet_addr *vaddr,
977 __be16 vport,
978 struct ip_vs_conn_param *p)
979{
980 p->net = net;
981 p->af = af;
982 p->protocol = protocol;
983 p->caddr = caddr;
984 p->cport = cport;
985 p->vaddr = vaddr;
986 p->vport = vport;
987 p->pe = NULL;
988 p->pe_data = NULL;
989}
990
991struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
992struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
993
994struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
995 const struct ip_vs_iphdr *iph,
996 unsigned int proto_off,
997 int inverse);
998
999struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1000
1001struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1002 const struct ip_vs_iphdr *iph,
1003 unsigned int proto_off,
1004 int inverse);
1005
1006/* put back the conn without restarting its timer */
1007static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1008{
1009 atomic_dec(&cp->refcnt);
1010}
1011extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1012extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1013
1014struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1015 const union nf_inet_addr *daddr,
1016 __be16 dport, unsigned flags,
1017 struct ip_vs_dest *dest, __u32 fwmark);
1018extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1019
1020extern const char * ip_vs_state_name(__u16 proto, int state);
1021
1022extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1023extern int ip_vs_check_template(struct ip_vs_conn *ct);
1024extern void ip_vs_random_dropentry(struct net *net);
1025extern int ip_vs_conn_init(void);
1026extern void ip_vs_conn_cleanup(void);
1027
1028static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1029{
1030 struct ip_vs_conn *ctl_cp = cp->control;
1031 if (!ctl_cp) {
1032 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1033 "%s:%d to %s:%d\n",
1034 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1035 ntohs(cp->cport),
1036 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1037 ntohs(cp->vport));
1038
1039 return;
1040 }
1041
1042 IP_VS_DBG_BUF(7, "DELeting control for: "
1043 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1044 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1045 ntohs(cp->cport),
1046 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1047 ntohs(ctl_cp->cport));
1048
1049 cp->control = NULL;
1050 if (atomic_read(&ctl_cp->n_control) == 0) {
1051 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1052 "%s:%d to %s:%d\n",
1053 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1054 ntohs(cp->cport),
1055 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1056 ntohs(cp->vport));
1057
1058 return;
1059 }
1060 atomic_dec(&ctl_cp->n_control);
1061}
1062
1063static inline void
1064ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1065{
1066 if (cp->control) {
1067 IP_VS_ERR_BUF("request control ADD for already controlled: "
1068 "%s:%d to %s:%d\n",
1069 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1070 ntohs(cp->cport),
1071 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1072 ntohs(cp->vport));
1073
1074 ip_vs_control_del(cp);
1075 }
1076
1077 IP_VS_DBG_BUF(7, "ADDing control for: "
1078 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1079 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1080 ntohs(cp->cport),
1081 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1082 ntohs(ctl_cp->cport));
1083
1084 cp->control = ctl_cp;
1085 atomic_inc(&ctl_cp->n_control);
1086}
1087
1088/*
1089 * IPVS netns init & cleanup functions
1090 */
1091extern int ip_vs_estimator_net_init(struct net *net);
1092extern int ip_vs_control_net_init(struct net *net);
1093extern int ip_vs_protocol_net_init(struct net *net);
1094extern int ip_vs_app_net_init(struct net *net);
1095extern int ip_vs_conn_net_init(struct net *net);
1096extern int ip_vs_sync_net_init(struct net *net);
1097extern void ip_vs_conn_net_cleanup(struct net *net);
1098extern void ip_vs_app_net_cleanup(struct net *net);
1099extern void ip_vs_protocol_net_cleanup(struct net *net);
1100extern void ip_vs_control_net_cleanup(struct net *net);
1101extern void ip_vs_estimator_net_cleanup(struct net *net);
1102extern void ip_vs_sync_net_cleanup(struct net *net);
1103extern void ip_vs_service_net_cleanup(struct net *net);
1104
1105/*
1106 * IPVS application functions
1107 * (from ip_vs_app.c)
1108 */
1109#define IP_VS_APP_MAX_PORTS 8
1110extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1111extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1112extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1113extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1114extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1115 __u16 proto, __u16 port);
1116extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1117extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1118
1119extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1120extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1121
1122void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1123void ip_vs_unbind_pe(struct ip_vs_service *svc);
1124int register_ip_vs_pe(struct ip_vs_pe *pe);
1125int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1126struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1127struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1128
1129static inline void ip_vs_pe_get(const struct ip_vs_pe *pe)
1130{
1131 if (pe && pe->module)
1132 __module_get(pe->module);
1133}
1134
1135static inline void ip_vs_pe_put(const struct ip_vs_pe *pe)
1136{
1137 if (pe && pe->module)
1138 module_put(pe->module);
1139}
1140
1141/*
1142 * IPVS protocol functions (from ip_vs_proto.c)
1143 */
1144extern int ip_vs_protocol_init(void);
1145extern void ip_vs_protocol_cleanup(void);
1146extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1147extern int *ip_vs_create_timeout_table(int *table, int size);
1148extern int
1149ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1150 const char *name, int to);
1151extern void
1152ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1153 const struct sk_buff *skb,
1154 int offset, const char *msg);
1155
1156extern struct ip_vs_protocol ip_vs_protocol_tcp;
1157extern struct ip_vs_protocol ip_vs_protocol_udp;
1158extern struct ip_vs_protocol ip_vs_protocol_icmp;
1159extern struct ip_vs_protocol ip_vs_protocol_esp;
1160extern struct ip_vs_protocol ip_vs_protocol_ah;
1161extern struct ip_vs_protocol ip_vs_protocol_sctp;
1162
1163/*
1164 * Registering/unregistering scheduler functions
1165 * (from ip_vs_sched.c)
1166 */
1167extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1168extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1169extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1170 struct ip_vs_scheduler *scheduler);
1171extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1172extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1173extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1174extern struct ip_vs_conn *
1175ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1176 struct ip_vs_proto_data *pd, int *ignored);
1177extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1178 struct ip_vs_proto_data *pd);
1179
1180extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1181
1182
1183/*
1184 * IPVS control data and functions (from ip_vs_ctl.c)
1185 */
1186extern struct ip_vs_stats ip_vs_stats;
1187extern const struct ctl_path net_vs_ctl_path[];
1188extern int sysctl_ip_vs_sync_ver;
1189
1190extern void ip_vs_sync_switch_mode(struct net *net, int mode);
1191extern struct ip_vs_service *
1192ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1193 const union nf_inet_addr *vaddr, __be16 vport);
1194
1195static inline void ip_vs_service_put(struct ip_vs_service *svc)
1196{
1197 atomic_dec(&svc->usecnt);
1198}
1199
1200extern struct ip_vs_dest *
1201ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1202 const union nf_inet_addr *daddr, __be16 dport);
1203
1204extern int ip_vs_use_count_inc(void);
1205extern void ip_vs_use_count_dec(void);
1206extern int ip_vs_control_init(void);
1207extern void ip_vs_control_cleanup(void);
1208extern struct ip_vs_dest *
1209ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1210 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1211 __u16 protocol, __u32 fwmark);
1212extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1213
1214
1215/*
1216 * IPVS sync daemon data and function prototypes
1217 * (from ip_vs_sync.c)
1218 */
1219extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1220 __u8 syncid);
1221extern int stop_sync_thread(struct net *net, int state);
1222extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp);
1223
1224
1225/*
1226 * IPVS rate estimator prototypes (from ip_vs_est.c)
1227 */
1228extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1229extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1230extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1231extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1232 struct ip_vs_stats *stats);
1233
1234/*
1235 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1236 */
1237extern int ip_vs_null_xmit
1238(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1239extern int ip_vs_bypass_xmit
1240(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1241extern int ip_vs_nat_xmit
1242(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1243extern int ip_vs_tunnel_xmit
1244(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1245extern int ip_vs_dr_xmit
1246(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1247extern int ip_vs_icmp_xmit
1248(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1249 int offset, unsigned int hooknum);
1250extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1251
1252#ifdef CONFIG_IP_VS_IPV6
1253extern int ip_vs_bypass_xmit_v6
1254(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1255extern int ip_vs_nat_xmit_v6
1256(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1257extern int ip_vs_tunnel_xmit_v6
1258(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1259extern int ip_vs_dr_xmit_v6
1260(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1261extern int ip_vs_icmp_xmit_v6
1262(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1263 int offset, unsigned int hooknum);
1264#endif
1265
1266#ifdef CONFIG_SYSCTL
1267/*
1268 * This is a simple mechanism to ignore packets when
1269 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1270 * we start to drop 1/rate of the packets
1271 */
1272
1273static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1274{
1275 if (!ipvs->drop_rate)
1276 return 0;
1277 if (--ipvs->drop_counter > 0)
1278 return 0;
1279 ipvs->drop_counter = ipvs->drop_rate;
1280 return 1;
1281}
1282#else
1283static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1284#endif
1285
1286/*
1287 * ip_vs_fwd_tag returns the forwarding tag of the connection
1288 */
1289#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1290
1291static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1292{
1293 char fwd;
1294
1295 switch (IP_VS_FWD_METHOD(cp)) {
1296 case IP_VS_CONN_F_MASQ:
1297 fwd = 'M'; break;
1298 case IP_VS_CONN_F_LOCALNODE:
1299 fwd = 'L'; break;
1300 case IP_VS_CONN_F_TUNNEL:
1301 fwd = 'T'; break;
1302 case IP_VS_CONN_F_DROUTE:
1303 fwd = 'R'; break;
1304 case IP_VS_CONN_F_BYPASS:
1305 fwd = 'B'; break;
1306 default:
1307 fwd = '?'; break;
1308 }
1309 return fwd;
1310}
1311
1312extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1313 struct ip_vs_conn *cp, int dir);
1314
1315#ifdef CONFIG_IP_VS_IPV6
1316extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1317 struct ip_vs_conn *cp, int dir);
1318#endif
1319
1320extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1321
1322static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1323{
1324 __be32 diff[2] = { ~old, new };
1325
1326 return csum_partial(diff, sizeof(diff), oldsum);
1327}
1328
1329#ifdef CONFIG_IP_VS_IPV6
1330static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1331 __wsum oldsum)
1332{
1333 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1334 new[3], new[2], new[1], new[0] };
1335
1336 return csum_partial(diff, sizeof(diff), oldsum);
1337}
1338#endif
1339
1340static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1341{
1342 __be16 diff[2] = { ~old, new };
1343
1344 return csum_partial(diff, sizeof(diff), oldsum);
1345}
1346
1347/*
1348 * Forget current conntrack (unconfirmed) and attach notrack entry
1349 */
1350static inline void ip_vs_notrack(struct sk_buff *skb)
1351{
1352#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1353 enum ip_conntrack_info ctinfo;
1354 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1355
1356 if (!ct || !nf_ct_is_untracked(ct)) {
1357 nf_reset(skb);
1358 skb->nfct = &nf_ct_untracked_get()->ct_general;
1359 skb->nfctinfo = IP_CT_NEW;
1360 nf_conntrack_get(skb->nfct);
1361 }
1362#endif
1363}
1364
1365#ifdef CONFIG_IP_VS_NFCT
1366/*
1367 * Netfilter connection tracking
1368 * (from ip_vs_nfct.c)
1369 */
1370static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1371{
1372#ifdef CONFIG_SYSCTL
1373 return ipvs->sysctl_conntrack;
1374#else
1375 return 0;
1376#endif
1377}
1378
1379extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1380 int outin);
1381extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1382extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1383 struct ip_vs_conn *cp, u_int8_t proto,
1384 const __be16 port, int from_rs);
1385extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1386
1387#else
1388
1389static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1390{
1391 return 0;
1392}
1393
1394static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1395 struct ip_vs_conn *cp, int outin)
1396{
1397}
1398
1399static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1400 struct ip_vs_conn *cp)
1401{
1402 return NF_ACCEPT;
1403}
1404
1405static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1406{
1407}
1408/* CONFIG_IP_VS_NFCT */
1409#endif
1410
1411static inline unsigned int
1412ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1413{
1414 /*
1415 * We think the overhead of processing active connections is 256
1416 * times higher than that of inactive connections in average. (This
1417 * 256 times might not be accurate, we will change it later) We
1418 * use the following formula to estimate the overhead now:
1419 * dest->activeconns*256 + dest->inactconns
1420 */
1421 return (atomic_read(&dest->activeconns) << 8) +
1422 atomic_read(&dest->inactconns);
1423}
1424
1425#endif /* _NET_IP_VS_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2/* IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
8
9#include <linux/ip_vs.h> /* definitions shared with userland */
10
11#include <asm/types.h> /* for __uXX types */
12
13#include <linux/list.h> /* for struct list_head */
14#include <linux/spinlock.h> /* for struct rwlock_t */
15#include <linux/atomic.h> /* for struct atomic_t */
16#include <linux/refcount.h> /* for struct refcount_t */
17
18#include <linux/compiler.h>
19#include <linux/timer.h>
20#include <linux/bug.h>
21
22#include <net/checksum.h>
23#include <linux/netfilter.h> /* for union nf_inet_addr */
24#include <linux/ip.h>
25#include <linux/ipv6.h> /* for struct ipv6hdr */
26#include <net/ipv6.h>
27#if IS_ENABLED(CONFIG_IP_VS_IPV6)
28#include <linux/netfilter_ipv6/ip6_tables.h>
29#endif
30#if IS_ENABLED(CONFIG_NF_CONNTRACK)
31#include <net/netfilter/nf_conntrack.h>
32#endif
33#include <net/net_namespace.h> /* Netw namespace */
34
35#define IP_VS_HDR_INVERSE 1
36#define IP_VS_HDR_ICMP 2
37
38/* Generic access of ipvs struct */
39static inline struct netns_ipvs *net_ipvs(struct net* net)
40{
41 return net->ipvs;
42}
43
44/* Connections' size value needed by ip_vs_ctl.c */
45extern int ip_vs_conn_tab_size;
46
47struct ip_vs_iphdr {
48 int hdr_flags; /* ipvs flags */
49 __u32 off; /* Where IP or IPv4 header starts */
50 __u32 len; /* IPv4 simply where L4 starts
51 * IPv6 where L4 Transport Header starts */
52 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
53 __s16 protocol;
54 __s32 flags;
55 union nf_inet_addr saddr;
56 union nf_inet_addr daddr;
57};
58
59static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
60 int len, void *buffer)
61{
62 return skb_header_pointer(skb, offset, len, buffer);
63}
64
65/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
66 * IPv6 requires some extra work, as finding proper header position,
67 * depend on the IPv6 extension headers.
68 */
69static inline int
70ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
71 int hdr_flags, struct ip_vs_iphdr *iphdr)
72{
73 iphdr->hdr_flags = hdr_flags;
74 iphdr->off = offset;
75
76#ifdef CONFIG_IP_VS_IPV6
77 if (af == AF_INET6) {
78 struct ipv6hdr _iph;
79 const struct ipv6hdr *iph = skb_header_pointer(
80 skb, offset, sizeof(_iph), &_iph);
81 if (!iph)
82 return 0;
83
84 iphdr->saddr.in6 = iph->saddr;
85 iphdr->daddr.in6 = iph->daddr;
86 /* ipv6_find_hdr() updates len, flags */
87 iphdr->len = offset;
88 iphdr->flags = 0;
89 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
90 &iphdr->fragoffs,
91 &iphdr->flags);
92 if (iphdr->protocol < 0)
93 return 0;
94 } else
95#endif
96 {
97 struct iphdr _iph;
98 const struct iphdr *iph = skb_header_pointer(
99 skb, offset, sizeof(_iph), &_iph);
100 if (!iph)
101 return 0;
102
103 iphdr->len = offset + iph->ihl * 4;
104 iphdr->fragoffs = 0;
105 iphdr->protocol = iph->protocol;
106 iphdr->saddr.ip = iph->saddr;
107 iphdr->daddr.ip = iph->daddr;
108 }
109
110 return 1;
111}
112
113static inline int
114ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
115 bool inverse, struct ip_vs_iphdr *iphdr)
116{
117 int hdr_flags = IP_VS_HDR_ICMP;
118
119 if (inverse)
120 hdr_flags |= IP_VS_HDR_INVERSE;
121
122 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
123}
124
125static inline int
126ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
127 struct ip_vs_iphdr *iphdr)
128{
129 int hdr_flags = 0;
130
131 if (inverse)
132 hdr_flags |= IP_VS_HDR_INVERSE;
133
134 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
135 hdr_flags, iphdr);
136}
137
138static inline bool
139ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
140{
141 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
142}
143
144static inline bool
145ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
146{
147 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
148}
149
150static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
151 const union nf_inet_addr *src)
152{
153#ifdef CONFIG_IP_VS_IPV6
154 if (af == AF_INET6)
155 dst->in6 = src->in6;
156 else
157#endif
158 dst->ip = src->ip;
159}
160
161static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
162 const union nf_inet_addr *src)
163{
164#ifdef CONFIG_IP_VS_IPV6
165 if (af == AF_INET6) {
166 dst->in6 = src->in6;
167 return;
168 }
169#endif
170 dst->ip = src->ip;
171 dst->all[1] = 0;
172 dst->all[2] = 0;
173 dst->all[3] = 0;
174}
175
176static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
177 const union nf_inet_addr *b)
178{
179#ifdef CONFIG_IP_VS_IPV6
180 if (af == AF_INET6)
181 return ipv6_addr_equal(&a->in6, &b->in6);
182#endif
183 return a->ip == b->ip;
184}
185
186#ifdef CONFIG_IP_VS_DEBUG
187#include <linux/net.h>
188
189int ip_vs_get_debug_level(void);
190
191static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
192 const union nf_inet_addr *addr,
193 int *idx)
194{
195 int len;
196#ifdef CONFIG_IP_VS_IPV6
197 if (af == AF_INET6)
198 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
199 &addr->in6) + 1;
200 else
201#endif
202 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
203 &addr->ip) + 1;
204
205 *idx += len;
206 BUG_ON(*idx > buf_len + 1);
207 return &buf[*idx - len];
208}
209
210#define IP_VS_DBG_BUF(level, msg, ...) \
211 do { \
212 char ip_vs_dbg_buf[160]; \
213 int ip_vs_dbg_idx = 0; \
214 if (level <= ip_vs_get_debug_level()) \
215 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
216 } while (0)
217#define IP_VS_ERR_BUF(msg...) \
218 do { \
219 char ip_vs_dbg_buf[160]; \
220 int ip_vs_dbg_idx = 0; \
221 pr_err(msg); \
222 } while (0)
223
224/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
225#define IP_VS_DBG_ADDR(af, addr) \
226 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
227 sizeof(ip_vs_dbg_buf), addr, \
228 &ip_vs_dbg_idx)
229
230#define IP_VS_DBG(level, msg, ...) \
231 do { \
232 if (level <= ip_vs_get_debug_level()) \
233 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
234 } while (0)
235#define IP_VS_DBG_RL(msg, ...) \
236 do { \
237 if (net_ratelimit()) \
238 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
239 } while (0)
240#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
241 do { \
242 if (level <= ip_vs_get_debug_level()) \
243 pp->debug_packet(af, pp, skb, ofs, msg); \
244 } while (0)
245#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
246 do { \
247 if (level <= ip_vs_get_debug_level() && \
248 net_ratelimit()) \
249 pp->debug_packet(af, pp, skb, ofs, msg); \
250 } while (0)
251#else /* NO DEBUGGING at ALL */
252#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
253#define IP_VS_ERR_BUF(msg...) do {} while (0)
254#define IP_VS_DBG(level, msg...) do {} while (0)
255#define IP_VS_DBG_RL(msg...) do {} while (0)
256#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
257#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
258#endif
259
260#define IP_VS_BUG() BUG()
261#define IP_VS_ERR_RL(msg, ...) \
262 do { \
263 if (net_ratelimit()) \
264 pr_err(msg, ##__VA_ARGS__); \
265 } while (0)
266
267#ifdef CONFIG_IP_VS_DEBUG
268#define EnterFunction(level) \
269 do { \
270 if (level <= ip_vs_get_debug_level()) \
271 printk(KERN_DEBUG \
272 pr_fmt("Enter: %s, %s line %i\n"), \
273 __func__, __FILE__, __LINE__); \
274 } while (0)
275#define LeaveFunction(level) \
276 do { \
277 if (level <= ip_vs_get_debug_level()) \
278 printk(KERN_DEBUG \
279 pr_fmt("Leave: %s, %s line %i\n"), \
280 __func__, __FILE__, __LINE__); \
281 } while (0)
282#else
283#define EnterFunction(level) do {} while (0)
284#define LeaveFunction(level) do {} while (0)
285#endif
286
287/* The port number of FTP service (in network order). */
288#define FTPPORT cpu_to_be16(21)
289#define FTPDATA cpu_to_be16(20)
290
291/* TCP State Values */
292enum {
293 IP_VS_TCP_S_NONE = 0,
294 IP_VS_TCP_S_ESTABLISHED,
295 IP_VS_TCP_S_SYN_SENT,
296 IP_VS_TCP_S_SYN_RECV,
297 IP_VS_TCP_S_FIN_WAIT,
298 IP_VS_TCP_S_TIME_WAIT,
299 IP_VS_TCP_S_CLOSE,
300 IP_VS_TCP_S_CLOSE_WAIT,
301 IP_VS_TCP_S_LAST_ACK,
302 IP_VS_TCP_S_LISTEN,
303 IP_VS_TCP_S_SYNACK,
304 IP_VS_TCP_S_LAST
305};
306
307/* UDP State Values */
308enum {
309 IP_VS_UDP_S_NORMAL,
310 IP_VS_UDP_S_LAST,
311};
312
313/* ICMP State Values */
314enum {
315 IP_VS_ICMP_S_NORMAL,
316 IP_VS_ICMP_S_LAST,
317};
318
319/* SCTP State Values */
320enum ip_vs_sctp_states {
321 IP_VS_SCTP_S_NONE,
322 IP_VS_SCTP_S_INIT1,
323 IP_VS_SCTP_S_INIT,
324 IP_VS_SCTP_S_COOKIE_SENT,
325 IP_VS_SCTP_S_COOKIE_REPLIED,
326 IP_VS_SCTP_S_COOKIE_WAIT,
327 IP_VS_SCTP_S_COOKIE,
328 IP_VS_SCTP_S_COOKIE_ECHOED,
329 IP_VS_SCTP_S_ESTABLISHED,
330 IP_VS_SCTP_S_SHUTDOWN_SENT,
331 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
332 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
333 IP_VS_SCTP_S_REJECTED,
334 IP_VS_SCTP_S_CLOSED,
335 IP_VS_SCTP_S_LAST
336};
337
338/* Connection templates use bits from state */
339#define IP_VS_CTPL_S_NONE 0x0000
340#define IP_VS_CTPL_S_ASSURED 0x0001
341#define IP_VS_CTPL_S_LAST 0x0002
342
343/* Delta sequence info structure
344 * Each ip_vs_conn has 2 (output AND input seq. changes).
345 * Only used in the VS/NAT.
346 */
347struct ip_vs_seq {
348 __u32 init_seq; /* Add delta from this seq */
349 __u32 delta; /* Delta in sequence numbers */
350 __u32 previous_delta; /* Delta in sequence numbers
351 * before last resized pkt */
352};
353
354/* counters per cpu */
355struct ip_vs_counters {
356 __u64 conns; /* connections scheduled */
357 __u64 inpkts; /* incoming packets */
358 __u64 outpkts; /* outgoing packets */
359 __u64 inbytes; /* incoming bytes */
360 __u64 outbytes; /* outgoing bytes */
361};
362/* Stats per cpu */
363struct ip_vs_cpu_stats {
364 struct ip_vs_counters cnt;
365 struct u64_stats_sync syncp;
366};
367
368/* IPVS statistics objects */
369struct ip_vs_estimator {
370 struct list_head list;
371
372 u64 last_inbytes;
373 u64 last_outbytes;
374 u64 last_conns;
375 u64 last_inpkts;
376 u64 last_outpkts;
377
378 u64 cps;
379 u64 inpps;
380 u64 outpps;
381 u64 inbps;
382 u64 outbps;
383};
384
385/*
386 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
387 */
388struct ip_vs_kstats {
389 u64 conns; /* connections scheduled */
390 u64 inpkts; /* incoming packets */
391 u64 outpkts; /* outgoing packets */
392 u64 inbytes; /* incoming bytes */
393 u64 outbytes; /* outgoing bytes */
394
395 u64 cps; /* current connection rate */
396 u64 inpps; /* current in packet rate */
397 u64 outpps; /* current out packet rate */
398 u64 inbps; /* current in byte rate */
399 u64 outbps; /* current out byte rate */
400};
401
402struct ip_vs_stats {
403 struct ip_vs_kstats kstats; /* kernel statistics */
404 struct ip_vs_estimator est; /* estimator */
405 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
406 spinlock_t lock; /* spin lock */
407 struct ip_vs_kstats kstats0; /* reset values */
408};
409
410struct dst_entry;
411struct iphdr;
412struct ip_vs_conn;
413struct ip_vs_app;
414struct sk_buff;
415struct ip_vs_proto_data;
416
417struct ip_vs_protocol {
418 struct ip_vs_protocol *next;
419 char *name;
420 u16 protocol;
421 u16 num_states;
422 int dont_defrag;
423
424 void (*init)(struct ip_vs_protocol *pp);
425
426 void (*exit)(struct ip_vs_protocol *pp);
427
428 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
429
430 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
431
432 int (*conn_schedule)(struct netns_ipvs *ipvs,
433 int af, struct sk_buff *skb,
434 struct ip_vs_proto_data *pd,
435 int *verdict, struct ip_vs_conn **cpp,
436 struct ip_vs_iphdr *iph);
437
438 struct ip_vs_conn *
439 (*conn_in_get)(struct netns_ipvs *ipvs,
440 int af,
441 const struct sk_buff *skb,
442 const struct ip_vs_iphdr *iph);
443
444 struct ip_vs_conn *
445 (*conn_out_get)(struct netns_ipvs *ipvs,
446 int af,
447 const struct sk_buff *skb,
448 const struct ip_vs_iphdr *iph);
449
450 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
451 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
452
453 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
454 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
455
456 const char *(*state_name)(int state);
457
458 void (*state_transition)(struct ip_vs_conn *cp, int direction,
459 const struct sk_buff *skb,
460 struct ip_vs_proto_data *pd);
461
462 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
463
464 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
465
466 int (*app_conn_bind)(struct ip_vs_conn *cp);
467
468 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
469 const struct sk_buff *skb,
470 int offset,
471 const char *msg);
472
473 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
474};
475
476/* protocol data per netns */
477struct ip_vs_proto_data {
478 struct ip_vs_proto_data *next;
479 struct ip_vs_protocol *pp;
480 int *timeout_table; /* protocol timeout table */
481 atomic_t appcnt; /* counter of proto app incs. */
482 struct tcp_states_t *tcp_state_table;
483};
484
485struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
486struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
487 unsigned short proto);
488
489struct ip_vs_conn_param {
490 struct netns_ipvs *ipvs;
491 const union nf_inet_addr *caddr;
492 const union nf_inet_addr *vaddr;
493 __be16 cport;
494 __be16 vport;
495 __u16 protocol;
496 u16 af;
497
498 const struct ip_vs_pe *pe;
499 char *pe_data;
500 __u8 pe_data_len;
501};
502
503/* IP_VS structure allocated for each dynamically scheduled connection */
504struct ip_vs_conn {
505 struct hlist_node c_list; /* hashed list heads */
506 /* Protocol, addresses and port numbers */
507 __be16 cport;
508 __be16 dport;
509 __be16 vport;
510 u16 af; /* address family */
511 union nf_inet_addr caddr; /* client address */
512 union nf_inet_addr vaddr; /* virtual address */
513 union nf_inet_addr daddr; /* destination address */
514 volatile __u32 flags; /* status flags */
515 __u16 protocol; /* Which protocol (TCP/UDP) */
516 __u16 daf; /* Address family of the dest */
517 struct netns_ipvs *ipvs;
518
519 /* counter and timer */
520 refcount_t refcnt; /* reference count */
521 struct timer_list timer; /* Expiration timer */
522 volatile unsigned long timeout; /* timeout */
523
524 /* Flags and state transition */
525 spinlock_t lock; /* lock for state transition */
526 volatile __u16 state; /* state info */
527 volatile __u16 old_state; /* old state, to be used for
528 * state transition triggerd
529 * synchronization
530 */
531 __u32 fwmark; /* Fire wall mark from skb */
532 unsigned long sync_endtime; /* jiffies + sent_retries */
533
534 /* Control members */
535 struct ip_vs_conn *control; /* Master control connection */
536 atomic_t n_control; /* Number of controlled ones */
537 struct ip_vs_dest *dest; /* real server */
538 atomic_t in_pkts; /* incoming packet counter */
539
540 /* Packet transmitter for different forwarding methods. If it
541 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
542 * otherwise this must be changed to a sk_buff **.
543 * NF_ACCEPT can be returned when destination is local.
544 */
545 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
546 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
547
548 /* Note: we can group the following members into a structure,
549 * in order to save more space, and the following members are
550 * only used in VS/NAT anyway
551 */
552 struct ip_vs_app *app; /* bound ip_vs_app object */
553 void *app_data; /* Application private data */
554 struct ip_vs_seq in_seq; /* incoming seq. struct */
555 struct ip_vs_seq out_seq; /* outgoing seq. struct */
556
557 const struct ip_vs_pe *pe;
558 char *pe_data;
559 __u8 pe_data_len;
560
561 struct rcu_head rcu_head;
562};
563
564/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
565 * for IPv6 support.
566 *
567 * We need these to conveniently pass around service and destination
568 * options, but unfortunately, we also need to keep the old definitions to
569 * maintain userspace backwards compatibility for the setsockopt interface.
570 */
571struct ip_vs_service_user_kern {
572 /* virtual service addresses */
573 u16 af;
574 u16 protocol;
575 union nf_inet_addr addr; /* virtual ip address */
576 __be16 port;
577 u32 fwmark; /* firwall mark of service */
578
579 /* virtual service options */
580 char *sched_name;
581 char *pe_name;
582 unsigned int flags; /* virtual service flags */
583 unsigned int timeout; /* persistent timeout in sec */
584 __be32 netmask; /* persistent netmask or plen */
585};
586
587
588struct ip_vs_dest_user_kern {
589 /* destination server address */
590 union nf_inet_addr addr;
591 __be16 port;
592
593 /* real server options */
594 unsigned int conn_flags; /* connection flags */
595 int weight; /* destination weight */
596
597 /* thresholds for active connections */
598 u32 u_threshold; /* upper threshold */
599 u32 l_threshold; /* lower threshold */
600
601 /* Address family of addr */
602 u16 af;
603
604 u16 tun_type; /* tunnel type */
605 __be16 tun_port; /* tunnel port */
606 u16 tun_flags; /* tunnel flags */
607};
608
609
610/*
611 * The information about the virtual service offered to the net and the
612 * forwarding entries.
613 */
614struct ip_vs_service {
615 struct hlist_node s_list; /* for normal service table */
616 struct hlist_node f_list; /* for fwmark-based service table */
617 atomic_t refcnt; /* reference counter */
618
619 u16 af; /* address family */
620 __u16 protocol; /* which protocol (TCP/UDP) */
621 union nf_inet_addr addr; /* IP address for virtual service */
622 __be16 port; /* port number for the service */
623 __u32 fwmark; /* firewall mark of the service */
624 unsigned int flags; /* service status flags */
625 unsigned int timeout; /* persistent timeout in ticks */
626 __be32 netmask; /* grouping granularity, mask/plen */
627 struct netns_ipvs *ipvs;
628
629 struct list_head destinations; /* real server d-linked list */
630 __u32 num_dests; /* number of servers */
631 struct ip_vs_stats stats; /* statistics for the service */
632
633 /* for scheduling */
634 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
635 spinlock_t sched_lock; /* lock sched_data */
636 void *sched_data; /* scheduler application data */
637
638 /* alternate persistence engine */
639 struct ip_vs_pe __rcu *pe;
640 int conntrack_afmask;
641
642 struct rcu_head rcu_head;
643};
644
645/* Information for cached dst */
646struct ip_vs_dest_dst {
647 struct dst_entry *dst_cache; /* destination cache entry */
648 u32 dst_cookie;
649 union nf_inet_addr dst_saddr;
650 struct rcu_head rcu_head;
651};
652
653/* The real server destination forwarding entry with ip address, port number,
654 * and so on.
655 */
656struct ip_vs_dest {
657 struct list_head n_list; /* for the dests in the service */
658 struct hlist_node d_list; /* for table with all the dests */
659
660 u16 af; /* address family */
661 __be16 port; /* port number of the server */
662 union nf_inet_addr addr; /* IP address of the server */
663 volatile unsigned int flags; /* dest status flags */
664 atomic_t conn_flags; /* flags to copy to conn */
665 atomic_t weight; /* server weight */
666 atomic_t last_weight; /* server latest weight */
667 __u16 tun_type; /* tunnel type */
668 __be16 tun_port; /* tunnel port */
669 __u16 tun_flags; /* tunnel flags */
670
671 refcount_t refcnt; /* reference counter */
672 struct ip_vs_stats stats; /* statistics */
673 unsigned long idle_start; /* start time, jiffies */
674
675 /* connection counters and thresholds */
676 atomic_t activeconns; /* active connections */
677 atomic_t inactconns; /* inactive connections */
678 atomic_t persistconns; /* persistent connections */
679 __u32 u_threshold; /* upper threshold */
680 __u32 l_threshold; /* lower threshold */
681
682 /* for destination cache */
683 spinlock_t dst_lock; /* lock of dst_cache */
684 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
685
686 /* for virtual service */
687 struct ip_vs_service __rcu *svc; /* service it belongs to */
688 __u16 protocol; /* which protocol (TCP/UDP) */
689 __be16 vport; /* virtual port number */
690 union nf_inet_addr vaddr; /* virtual IP address */
691 __u32 vfwmark; /* firewall mark of service */
692
693 struct list_head t_list; /* in dest_trash */
694 unsigned int in_rs_table:1; /* we are in rs_table */
695};
696
697/* The scheduler object */
698struct ip_vs_scheduler {
699 struct list_head n_list; /* d-linked list head */
700 char *name; /* scheduler name */
701 atomic_t refcnt; /* reference counter */
702 struct module *module; /* THIS_MODULE/NULL */
703
704 /* scheduler initializing service */
705 int (*init_service)(struct ip_vs_service *svc);
706 /* scheduling service finish */
707 void (*done_service)(struct ip_vs_service *svc);
708 /* dest is linked */
709 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is unlinked */
711 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712 /* dest is updated */
713 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
714
715 /* selecting a server from the given service */
716 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
717 const struct sk_buff *skb,
718 struct ip_vs_iphdr *iph);
719};
720
721/* The persistence engine object */
722struct ip_vs_pe {
723 struct list_head n_list; /* d-linked list head */
724 char *name; /* scheduler name */
725 atomic_t refcnt; /* reference counter */
726 struct module *module; /* THIS_MODULE/NULL */
727
728 /* get the connection template, if any */
729 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
730 bool (*ct_match)(const struct ip_vs_conn_param *p,
731 struct ip_vs_conn *ct);
732 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
733 bool inverse);
734 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
735 /* create connections for real-server outgoing packets */
736 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
737 struct ip_vs_dest *dest,
738 struct sk_buff *skb,
739 const struct ip_vs_iphdr *iph,
740 __be16 dport, __be16 cport);
741};
742
743/* The application module object (a.k.a. app incarnation) */
744struct ip_vs_app {
745 struct list_head a_list; /* member in app list */
746 int type; /* IP_VS_APP_TYPE_xxx */
747 char *name; /* application module name */
748 __u16 protocol;
749 struct module *module; /* THIS_MODULE/NULL */
750 struct list_head incs_list; /* list of incarnations */
751
752 /* members for application incarnations */
753 struct list_head p_list; /* member in proto app list */
754 struct ip_vs_app *app; /* its real application */
755 __be16 port; /* port number in net order */
756 atomic_t usecnt; /* usage counter */
757 struct rcu_head rcu_head;
758
759 /* output hook: Process packet in inout direction, diff set for TCP.
760 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
761 * 2=Mangled but checksum was not updated
762 */
763 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
764 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
765
766 /* input hook: Process packet in outin direction, diff set for TCP.
767 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
768 * 2=Mangled but checksum was not updated
769 */
770 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
771 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
772
773 /* ip_vs_app initializer */
774 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
775
776 /* ip_vs_app finish */
777 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
778
779
780 /* not used now */
781 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
782 struct ip_vs_protocol *);
783
784 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
785
786 int * timeout_table;
787 int * timeouts;
788 int timeouts_size;
789
790 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
791 int *verdict, struct ip_vs_conn **cpp);
792
793 struct ip_vs_conn *
794 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
795 const struct iphdr *iph, int inverse);
796
797 struct ip_vs_conn *
798 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
799 const struct iphdr *iph, int inverse);
800
801 int (*state_transition)(struct ip_vs_conn *cp, int direction,
802 const struct sk_buff *skb,
803 struct ip_vs_app *app);
804
805 void (*timeout_change)(struct ip_vs_app *app, int flags);
806};
807
808struct ipvs_master_sync_state {
809 struct list_head sync_queue;
810 struct ip_vs_sync_buff *sync_buff;
811 unsigned long sync_queue_len;
812 unsigned int sync_queue_delay;
813 struct delayed_work master_wakeup_work;
814 struct netns_ipvs *ipvs;
815};
816
817struct ip_vs_sync_thread_data;
818
819/* How much time to keep dests in trash */
820#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
821
822struct ipvs_sync_daemon_cfg {
823 union nf_inet_addr mcast_group;
824 int syncid;
825 u16 sync_maxlen;
826 u16 mcast_port;
827 u8 mcast_af;
828 u8 mcast_ttl;
829 /* multicast interface name */
830 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
831};
832
833/* IPVS in network namespace */
834struct netns_ipvs {
835 int gen; /* Generation */
836 int enable; /* enable like nf_hooks do */
837 /* Hash table: for real service lookups */
838 #define IP_VS_RTAB_BITS 4
839 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
840 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
841
842 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
843 /* ip_vs_app */
844 struct list_head app_list;
845 /* ip_vs_proto */
846 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
847 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
848 /* ip_vs_proto_tcp */
849#ifdef CONFIG_IP_VS_PROTO_TCP
850 #define TCP_APP_TAB_BITS 4
851 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
852 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
853 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
854#endif
855 /* ip_vs_proto_udp */
856#ifdef CONFIG_IP_VS_PROTO_UDP
857 #define UDP_APP_TAB_BITS 4
858 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
859 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
860 struct list_head udp_apps[UDP_APP_TAB_SIZE];
861#endif
862 /* ip_vs_proto_sctp */
863#ifdef CONFIG_IP_VS_PROTO_SCTP
864 #define SCTP_APP_TAB_BITS 4
865 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
866 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
867 /* Hash table for SCTP application incarnations */
868 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
869#endif
870 /* ip_vs_conn */
871 atomic_t conn_count; /* connection counter */
872
873 /* ip_vs_ctl */
874 struct ip_vs_stats tot_stats; /* Statistics & est. */
875
876 int num_services; /* no of virtual services */
877
878 /* Trash for destinations */
879 struct list_head dest_trash;
880 spinlock_t dest_trash_lock;
881 struct timer_list dest_trash_timer; /* expiration timer */
882 /* Service counters */
883 atomic_t ftpsvc_counter;
884 atomic_t nullsvc_counter;
885 atomic_t conn_out_counter;
886
887#ifdef CONFIG_SYSCTL
888 /* 1/rate drop and drop-entry variables */
889 struct delayed_work defense_work; /* Work handler */
890 int drop_rate;
891 int drop_counter;
892 int old_secure_tcp;
893 atomic_t dropentry;
894 /* locks in ctl.c */
895 spinlock_t dropentry_lock; /* drop entry handling */
896 spinlock_t droppacket_lock; /* drop packet handling */
897 spinlock_t securetcp_lock; /* state and timeout tables */
898
899 /* sys-ctl struct */
900 struct ctl_table_header *sysctl_hdr;
901 struct ctl_table *sysctl_tbl;
902#endif
903
904 /* sysctl variables */
905 int sysctl_amemthresh;
906 int sysctl_am_droprate;
907 int sysctl_drop_entry;
908 int sysctl_drop_packet;
909 int sysctl_secure_tcp;
910#ifdef CONFIG_IP_VS_NFCT
911 int sysctl_conntrack;
912#endif
913 int sysctl_snat_reroute;
914 int sysctl_sync_ver;
915 int sysctl_sync_ports;
916 int sysctl_sync_persist_mode;
917 unsigned long sysctl_sync_qlen_max;
918 int sysctl_sync_sock_size;
919 int sysctl_cache_bypass;
920 int sysctl_expire_nodest_conn;
921 int sysctl_sloppy_tcp;
922 int sysctl_sloppy_sctp;
923 int sysctl_expire_quiescent_template;
924 int sysctl_sync_threshold[2];
925 unsigned int sysctl_sync_refresh_period;
926 int sysctl_sync_retries;
927 int sysctl_nat_icmp_send;
928 int sysctl_pmtu_disc;
929 int sysctl_backup_only;
930 int sysctl_conn_reuse_mode;
931 int sysctl_schedule_icmp;
932 int sysctl_ignore_tunneled;
933
934 /* ip_vs_lblc */
935 int sysctl_lblc_expiration;
936 struct ctl_table_header *lblc_ctl_header;
937 struct ctl_table *lblc_ctl_table;
938 /* ip_vs_lblcr */
939 int sysctl_lblcr_expiration;
940 struct ctl_table_header *lblcr_ctl_header;
941 struct ctl_table *lblcr_ctl_table;
942 /* ip_vs_est */
943 struct list_head est_list; /* estimator list */
944 spinlock_t est_lock;
945 struct timer_list est_timer; /* Estimation timer */
946 /* ip_vs_sync */
947 spinlock_t sync_lock;
948 struct ipvs_master_sync_state *ms;
949 spinlock_t sync_buff_lock;
950 struct ip_vs_sync_thread_data *master_tinfo;
951 struct ip_vs_sync_thread_data *backup_tinfo;
952 int threads_mask;
953 volatile int sync_state;
954 struct mutex sync_mutex;
955 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
956 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
957 /* net name space ptr */
958 struct net *net; /* Needed by timer routines */
959 /* Number of heterogeneous destinations, needed becaus heterogeneous
960 * are not supported when synchronization is enabled.
961 */
962 unsigned int mixed_address_family_dests;
963};
964
965#define DEFAULT_SYNC_THRESHOLD 3
966#define DEFAULT_SYNC_PERIOD 50
967#define DEFAULT_SYNC_VER 1
968#define DEFAULT_SLOPPY_TCP 0
969#define DEFAULT_SLOPPY_SCTP 0
970#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
971#define DEFAULT_SYNC_RETRIES 0
972#define IPVS_SYNC_WAKEUP_RATE 8
973#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
974#define IPVS_SYNC_SEND_DELAY (HZ / 50)
975#define IPVS_SYNC_CHECK_PERIOD HZ
976#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
977#define IPVS_SYNC_PORTS_MAX (1 << 6)
978
979#ifdef CONFIG_SYSCTL
980
981static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
982{
983 return ipvs->sysctl_sync_threshold[0];
984}
985
986static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
987{
988 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
989}
990
991static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
992{
993 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
994}
995
996static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
997{
998 return ipvs->sysctl_sync_retries;
999}
1000
1001static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1002{
1003 return ipvs->sysctl_sync_ver;
1004}
1005
1006static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1007{
1008 return ipvs->sysctl_sloppy_tcp;
1009}
1010
1011static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1012{
1013 return ipvs->sysctl_sloppy_sctp;
1014}
1015
1016static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1017{
1018 return READ_ONCE(ipvs->sysctl_sync_ports);
1019}
1020
1021static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1022{
1023 return ipvs->sysctl_sync_persist_mode;
1024}
1025
1026static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1027{
1028 return ipvs->sysctl_sync_qlen_max;
1029}
1030
1031static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1032{
1033 return ipvs->sysctl_sync_sock_size;
1034}
1035
1036static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1037{
1038 return ipvs->sysctl_pmtu_disc;
1039}
1040
1041static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1042{
1043 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1044 ipvs->sysctl_backup_only;
1045}
1046
1047static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1048{
1049 return ipvs->sysctl_conn_reuse_mode;
1050}
1051
1052static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1053{
1054 return ipvs->sysctl_schedule_icmp;
1055}
1056
1057static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1058{
1059 return ipvs->sysctl_ignore_tunneled;
1060}
1061
1062static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1063{
1064 return ipvs->sysctl_cache_bypass;
1065}
1066
1067#else
1068
1069static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1070{
1071 return DEFAULT_SYNC_THRESHOLD;
1072}
1073
1074static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1075{
1076 return DEFAULT_SYNC_PERIOD;
1077}
1078
1079static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1080{
1081 return DEFAULT_SYNC_REFRESH_PERIOD;
1082}
1083
1084static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1085{
1086 return DEFAULT_SYNC_RETRIES & 3;
1087}
1088
1089static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1090{
1091 return DEFAULT_SYNC_VER;
1092}
1093
1094static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1095{
1096 return DEFAULT_SLOPPY_TCP;
1097}
1098
1099static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1100{
1101 return DEFAULT_SLOPPY_SCTP;
1102}
1103
1104static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1105{
1106 return 1;
1107}
1108
1109static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1110{
1111 return 0;
1112}
1113
1114static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1115{
1116 return IPVS_SYNC_QLEN_MAX;
1117}
1118
1119static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1120{
1121 return 0;
1122}
1123
1124static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1125{
1126 return 1;
1127}
1128
1129static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1130{
1131 return 0;
1132}
1133
1134static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1135{
1136 return 1;
1137}
1138
1139static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1140{
1141 return 0;
1142}
1143
1144static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1145{
1146 return 0;
1147}
1148
1149static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1150{
1151 return 0;
1152}
1153
1154#endif
1155
1156/* IPVS core functions
1157 * (from ip_vs_core.c)
1158 */
1159const char *ip_vs_proto_name(unsigned int proto);
1160void ip_vs_init_hash_table(struct list_head *table, int rows);
1161struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1162 struct ip_vs_dest *dest,
1163 struct sk_buff *skb,
1164 const struct ip_vs_iphdr *iph,
1165 __be16 dport,
1166 __be16 cport);
1167#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1168
1169#define IP_VS_APP_TYPE_FTP 1
1170
1171/* ip_vs_conn handling functions
1172 * (from ip_vs_conn.c)
1173 */
1174enum {
1175 IP_VS_DIR_INPUT = 0,
1176 IP_VS_DIR_OUTPUT,
1177 IP_VS_DIR_INPUT_ONLY,
1178 IP_VS_DIR_LAST,
1179};
1180
1181static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1182 const union nf_inet_addr *caddr,
1183 __be16 cport,
1184 const union nf_inet_addr *vaddr,
1185 __be16 vport,
1186 struct ip_vs_conn_param *p)
1187{
1188 p->ipvs = ipvs;
1189 p->af = af;
1190 p->protocol = protocol;
1191 p->caddr = caddr;
1192 p->cport = cport;
1193 p->vaddr = vaddr;
1194 p->vport = vport;
1195 p->pe = NULL;
1196 p->pe_data = NULL;
1197}
1198
1199struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1200struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1201
1202struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1203 const struct sk_buff *skb,
1204 const struct ip_vs_iphdr *iph);
1205
1206struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1207
1208struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1209 const struct sk_buff *skb,
1210 const struct ip_vs_iphdr *iph);
1211
1212/* Get reference to gain full access to conn.
1213 * By default, RCU read-side critical sections have access only to
1214 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1215 */
1216static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1217{
1218 return refcount_inc_not_zero(&cp->refcnt);
1219}
1220
1221/* put back the conn without restarting its timer */
1222static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1223{
1224 smp_mb__before_atomic();
1225 refcount_dec(&cp->refcnt);
1226}
1227void ip_vs_conn_put(struct ip_vs_conn *cp);
1228void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1229
1230struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1231 const union nf_inet_addr *daddr,
1232 __be16 dport, unsigned int flags,
1233 struct ip_vs_dest *dest, __u32 fwmark);
1234void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1235
1236const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1237
1238void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1239int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1240void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1241int ip_vs_conn_init(void);
1242void ip_vs_conn_cleanup(void);
1243
1244static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1245{
1246 struct ip_vs_conn *ctl_cp = cp->control;
1247 if (!ctl_cp) {
1248 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1249 "%s:%d to %s:%d\n",
1250 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1251 ntohs(cp->cport),
1252 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1253 ntohs(cp->vport));
1254
1255 return;
1256 }
1257
1258 IP_VS_DBG_BUF(7, "DELeting control for: "
1259 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1260 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1261 ntohs(cp->cport),
1262 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1263 ntohs(ctl_cp->cport));
1264
1265 cp->control = NULL;
1266 if (atomic_read(&ctl_cp->n_control) == 0) {
1267 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1268 "%s:%d to %s:%d\n",
1269 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1270 ntohs(cp->cport),
1271 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1272 ntohs(cp->vport));
1273
1274 return;
1275 }
1276 atomic_dec(&ctl_cp->n_control);
1277}
1278
1279static inline void
1280ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1281{
1282 if (cp->control) {
1283 IP_VS_ERR_BUF("request control ADD for already controlled: "
1284 "%s:%d to %s:%d\n",
1285 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1286 ntohs(cp->cport),
1287 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1288 ntohs(cp->vport));
1289
1290 ip_vs_control_del(cp);
1291 }
1292
1293 IP_VS_DBG_BUF(7, "ADDing control for: "
1294 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1295 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1296 ntohs(cp->cport),
1297 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1298 ntohs(ctl_cp->cport));
1299
1300 cp->control = ctl_cp;
1301 atomic_inc(&ctl_cp->n_control);
1302}
1303
1304/* Mark our template as assured */
1305static inline void
1306ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1307{
1308 struct ip_vs_conn *ct = cp->control;
1309
1310 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1311 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1312 ct->state |= IP_VS_CTPL_S_ASSURED;
1313}
1314
1315/* IPVS netns init & cleanup functions */
1316int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1317int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1318int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1319int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1320int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1321int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1322void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1323void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1324void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1325void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1326void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1327void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1328void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1329
1330/* IPVS application functions
1331 * (from ip_vs_app.c)
1332 */
1333#define IP_VS_APP_MAX_PORTS 8
1334struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1335void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1336int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1337void ip_vs_unbind_app(struct ip_vs_conn *cp);
1338int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1339 __u16 port);
1340int ip_vs_app_inc_get(struct ip_vs_app *inc);
1341void ip_vs_app_inc_put(struct ip_vs_app *inc);
1342
1343int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1344 struct ip_vs_iphdr *ipvsh);
1345int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1346 struct ip_vs_iphdr *ipvsh);
1347
1348int register_ip_vs_pe(struct ip_vs_pe *pe);
1349int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1350struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1351struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1352
1353/* Use a #define to avoid all of module.h just for these trivial ops */
1354#define ip_vs_pe_get(pe) \
1355 if (pe && pe->module) \
1356 __module_get(pe->module);
1357
1358#define ip_vs_pe_put(pe) \
1359 if (pe && pe->module) \
1360 module_put(pe->module);
1361
1362/* IPVS protocol functions (from ip_vs_proto.c) */
1363int ip_vs_protocol_init(void);
1364void ip_vs_protocol_cleanup(void);
1365void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1366int *ip_vs_create_timeout_table(int *table, int size);
1367void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1368 const struct sk_buff *skb, int offset,
1369 const char *msg);
1370
1371extern struct ip_vs_protocol ip_vs_protocol_tcp;
1372extern struct ip_vs_protocol ip_vs_protocol_udp;
1373extern struct ip_vs_protocol ip_vs_protocol_icmp;
1374extern struct ip_vs_protocol ip_vs_protocol_esp;
1375extern struct ip_vs_protocol ip_vs_protocol_ah;
1376extern struct ip_vs_protocol ip_vs_protocol_sctp;
1377
1378/* Registering/unregistering scheduler functions
1379 * (from ip_vs_sched.c)
1380 */
1381int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1382int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1383int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1384 struct ip_vs_scheduler *scheduler);
1385void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1386 struct ip_vs_scheduler *sched);
1387struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1388void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1389struct ip_vs_conn *
1390ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1391 struct ip_vs_proto_data *pd, int *ignored,
1392 struct ip_vs_iphdr *iph);
1393int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1394 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1395
1396void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1397
1398/* IPVS control data and functions (from ip_vs_ctl.c) */
1399extern struct ip_vs_stats ip_vs_stats;
1400extern int sysctl_ip_vs_sync_ver;
1401
1402struct ip_vs_service *
1403ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1404 const union nf_inet_addr *vaddr, __be16 vport);
1405
1406bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1407 const union nf_inet_addr *daddr, __be16 dport);
1408
1409struct ip_vs_dest *
1410ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1411 const union nf_inet_addr *daddr, __be16 dport);
1412struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1413 const union nf_inet_addr *daddr,
1414 __be16 tun_port);
1415
1416int ip_vs_use_count_inc(void);
1417void ip_vs_use_count_dec(void);
1418int ip_vs_register_nl_ioctl(void);
1419void ip_vs_unregister_nl_ioctl(void);
1420int ip_vs_control_init(void);
1421void ip_vs_control_cleanup(void);
1422struct ip_vs_dest *
1423ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1424 const union nf_inet_addr *daddr, __be16 dport,
1425 const union nf_inet_addr *vaddr, __be16 vport,
1426 __u16 protocol, __u32 fwmark, __u32 flags);
1427void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1428
1429static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1430{
1431 refcount_inc(&dest->refcnt);
1432}
1433
1434static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1435{
1436 smp_mb__before_atomic();
1437 refcount_dec(&dest->refcnt);
1438}
1439
1440static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1441{
1442 if (refcount_dec_and_test(&dest->refcnt))
1443 kfree(dest);
1444}
1445
1446/* IPVS sync daemon data and function prototypes
1447 * (from ip_vs_sync.c)
1448 */
1449int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1450 int state);
1451int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1452void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1453
1454/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1455void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1456void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1457void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1458void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1459
1460/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1461int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1462 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1464 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1466 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1467int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1468 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1469int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1470 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1471int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1472 struct ip_vs_protocol *pp, int offset,
1473 unsigned int hooknum, struct ip_vs_iphdr *iph);
1474void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1475
1476#ifdef CONFIG_IP_VS_IPV6
1477int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1478 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1485int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1486 struct ip_vs_protocol *pp, int offset,
1487 unsigned int hooknum, struct ip_vs_iphdr *iph);
1488#endif
1489
1490#ifdef CONFIG_SYSCTL
1491/* This is a simple mechanism to ignore packets when
1492 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1493 * we start to drop 1/rate of the packets
1494 */
1495static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1496{
1497 if (!ipvs->drop_rate)
1498 return 0;
1499 if (--ipvs->drop_counter > 0)
1500 return 0;
1501 ipvs->drop_counter = ipvs->drop_rate;
1502 return 1;
1503}
1504#else
1505static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1506#endif
1507
1508#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1509 IP_VS_CONN_F_FWD_MASK)
1510
1511/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1512#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1513
1514static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1515{
1516 char fwd;
1517
1518 switch (IP_VS_FWD_METHOD(cp)) {
1519 case IP_VS_CONN_F_MASQ:
1520 fwd = 'M'; break;
1521 case IP_VS_CONN_F_LOCALNODE:
1522 fwd = 'L'; break;
1523 case IP_VS_CONN_F_TUNNEL:
1524 fwd = 'T'; break;
1525 case IP_VS_CONN_F_DROUTE:
1526 fwd = 'R'; break;
1527 case IP_VS_CONN_F_BYPASS:
1528 fwd = 'B'; break;
1529 default:
1530 fwd = '?'; break;
1531 }
1532 return fwd;
1533}
1534
1535void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1536 struct ip_vs_conn *cp, int dir);
1537
1538#ifdef CONFIG_IP_VS_IPV6
1539void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1540 struct ip_vs_conn *cp, int dir);
1541#endif
1542
1543__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1544
1545static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1546{
1547 __be32 diff[2] = { ~old, new };
1548
1549 return csum_partial(diff, sizeof(diff), oldsum);
1550}
1551
1552#ifdef CONFIG_IP_VS_IPV6
1553static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1554 __wsum oldsum)
1555{
1556 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1557 new[3], new[2], new[1], new[0] };
1558
1559 return csum_partial(diff, sizeof(diff), oldsum);
1560}
1561#endif
1562
1563static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1564{
1565 __be16 diff[2] = { ~old, new };
1566
1567 return csum_partial(diff, sizeof(diff), oldsum);
1568}
1569
1570/* Forget current conntrack (unconfirmed) and attach notrack entry */
1571static inline void ip_vs_notrack(struct sk_buff *skb)
1572{
1573#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1574 enum ip_conntrack_info ctinfo;
1575 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1576
1577 if (ct) {
1578 nf_conntrack_put(&ct->ct_general);
1579 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1580 }
1581#endif
1582}
1583
1584#ifdef CONFIG_IP_VS_NFCT
1585/* Netfilter connection tracking
1586 * (from ip_vs_nfct.c)
1587 */
1588static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1589{
1590#ifdef CONFIG_SYSCTL
1591 return ipvs->sysctl_conntrack;
1592#else
1593 return 0;
1594#endif
1595}
1596
1597void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1598 int outin);
1599int ip_vs_confirm_conntrack(struct sk_buff *skb);
1600void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1601 struct ip_vs_conn *cp, u_int8_t proto,
1602 const __be16 port, int from_rs);
1603void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1604
1605#else
1606
1607static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1608{
1609 return 0;
1610}
1611
1612static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1613 struct ip_vs_conn *cp, int outin)
1614{
1615}
1616
1617static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1618{
1619 return NF_ACCEPT;
1620}
1621
1622static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1623{
1624}
1625#endif /* CONFIG_IP_VS_NFCT */
1626
1627/* Really using conntrack? */
1628static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1629 struct sk_buff *skb)
1630{
1631#ifdef CONFIG_IP_VS_NFCT
1632 enum ip_conntrack_info ctinfo;
1633 struct nf_conn *ct;
1634
1635 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1636 return false;
1637 ct = nf_ct_get(skb, &ctinfo);
1638 if (ct)
1639 return true;
1640#endif
1641 return false;
1642}
1643
1644static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1645{
1646#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1647 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1648 int ret = 0;
1649
1650 if (!(svc->conntrack_afmask & afmask)) {
1651 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1652 if (ret >= 0)
1653 svc->conntrack_afmask |= afmask;
1654 }
1655 return ret;
1656#else
1657 return 0;
1658#endif
1659}
1660
1661static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1662{
1663#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1664 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1665
1666 if (svc->conntrack_afmask & afmask) {
1667 nf_ct_netns_put(svc->ipvs->net, svc->af);
1668 svc->conntrack_afmask &= ~afmask;
1669 }
1670#endif
1671}
1672
1673static inline int
1674ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1675{
1676 /* We think the overhead of processing active connections is 256
1677 * times higher than that of inactive connections in average. (This
1678 * 256 times might not be accurate, we will change it later) We
1679 * use the following formula to estimate the overhead now:
1680 * dest->activeconns*256 + dest->inactconns
1681 */
1682 return (atomic_read(&dest->activeconns) << 8) +
1683 atomic_read(&dest->inactconns);
1684}
1685
1686#endif /* _NET_IP_VS_H */