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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#include <linux/workqueue.h>
18
19#include <linux/compiler.h>
20#include <linux/timer.h>
21#include <linux/bug.h>
22
23#include <net/checksum.h>
24#include <linux/netfilter.h> /* for union nf_inet_addr */
25#include <linux/ip.h>
26#include <linux/ipv6.h> /* for struct ipv6hdr */
27#include <net/ipv6.h>
28#if IS_ENABLED(CONFIG_NF_CONNTRACK)
29#include <net/netfilter/nf_conntrack.h>
30#endif
31#include <net/net_namespace.h> /* Netw namespace */
32
33#define IP_VS_HDR_INVERSE 1
34#define IP_VS_HDR_ICMP 2
35
36/* Generic access of ipvs struct */
37static inline struct netns_ipvs *net_ipvs(struct net* net)
38{
39 return net->ipvs;
40}
41
42/* Connections' size value needed by ip_vs_ctl.c */
43extern int ip_vs_conn_tab_size;
44
45struct ip_vs_iphdr {
46 int hdr_flags; /* ipvs flags */
47 __u32 off; /* Where IP or IPv4 header starts */
48 __u32 len; /* IPv4 simply where L4 starts
49 * IPv6 where L4 Transport Header starts */
50 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
51 __s16 protocol;
52 __s32 flags;
53 union nf_inet_addr saddr;
54 union nf_inet_addr daddr;
55};
56
57static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
58 int len, void *buffer)
59{
60 return skb_header_pointer(skb, offset, len, buffer);
61}
62
63/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
64 * IPv6 requires some extra work, as finding proper header position,
65 * depend on the IPv6 extension headers.
66 */
67static inline int
68ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
69 int hdr_flags, struct ip_vs_iphdr *iphdr)
70{
71 iphdr->hdr_flags = hdr_flags;
72 iphdr->off = offset;
73
74#ifdef CONFIG_IP_VS_IPV6
75 if (af == AF_INET6) {
76 struct ipv6hdr _iph;
77 const struct ipv6hdr *iph = skb_header_pointer(
78 skb, offset, sizeof(_iph), &_iph);
79 if (!iph)
80 return 0;
81
82 iphdr->saddr.in6 = iph->saddr;
83 iphdr->daddr.in6 = iph->daddr;
84 /* ipv6_find_hdr() updates len, flags */
85 iphdr->len = offset;
86 iphdr->flags = 0;
87 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
88 &iphdr->fragoffs,
89 &iphdr->flags);
90 if (iphdr->protocol < 0)
91 return 0;
92 } else
93#endif
94 {
95 struct iphdr _iph;
96 const struct iphdr *iph = skb_header_pointer(
97 skb, offset, sizeof(_iph), &_iph);
98 if (!iph)
99 return 0;
100
101 iphdr->len = offset + iph->ihl * 4;
102 iphdr->fragoffs = 0;
103 iphdr->protocol = iph->protocol;
104 iphdr->saddr.ip = iph->saddr;
105 iphdr->daddr.ip = iph->daddr;
106 }
107
108 return 1;
109}
110
111static inline int
112ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
113 bool inverse, struct ip_vs_iphdr *iphdr)
114{
115 int hdr_flags = IP_VS_HDR_ICMP;
116
117 if (inverse)
118 hdr_flags |= IP_VS_HDR_INVERSE;
119
120 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
121}
122
123static inline int
124ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
125 struct ip_vs_iphdr *iphdr)
126{
127 int hdr_flags = 0;
128
129 if (inverse)
130 hdr_flags |= IP_VS_HDR_INVERSE;
131
132 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
133 hdr_flags, iphdr);
134}
135
136static inline bool
137ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
138{
139 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
140}
141
142static inline bool
143ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
144{
145 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
146}
147
148static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
149 const union nf_inet_addr *src)
150{
151#ifdef CONFIG_IP_VS_IPV6
152 if (af == AF_INET6)
153 dst->in6 = src->in6;
154 else
155#endif
156 dst->ip = src->ip;
157}
158
159static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
160 const union nf_inet_addr *src)
161{
162#ifdef CONFIG_IP_VS_IPV6
163 if (af == AF_INET6) {
164 dst->in6 = src->in6;
165 return;
166 }
167#endif
168 dst->ip = src->ip;
169 dst->all[1] = 0;
170 dst->all[2] = 0;
171 dst->all[3] = 0;
172}
173
174static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
175 const union nf_inet_addr *b)
176{
177#ifdef CONFIG_IP_VS_IPV6
178 if (af == AF_INET6)
179 return ipv6_addr_equal(&a->in6, &b->in6);
180#endif
181 return a->ip == b->ip;
182}
183
184#ifdef CONFIG_IP_VS_DEBUG
185#include <linux/net.h>
186
187int ip_vs_get_debug_level(void);
188
189static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
190 const union nf_inet_addr *addr,
191 int *idx)
192{
193 int len;
194#ifdef CONFIG_IP_VS_IPV6
195 if (af == AF_INET6)
196 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
197 &addr->in6) + 1;
198 else
199#endif
200 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
201 &addr->ip) + 1;
202
203 *idx += len;
204 BUG_ON(*idx > buf_len + 1);
205 return &buf[*idx - len];
206}
207
208#define IP_VS_DBG_BUF(level, msg, ...) \
209 do { \
210 char ip_vs_dbg_buf[160]; \
211 int ip_vs_dbg_idx = 0; \
212 if (level <= ip_vs_get_debug_level()) \
213 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
214 } while (0)
215#define IP_VS_ERR_BUF(msg...) \
216 do { \
217 char ip_vs_dbg_buf[160]; \
218 int ip_vs_dbg_idx = 0; \
219 pr_err(msg); \
220 } while (0)
221
222/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
223#define IP_VS_DBG_ADDR(af, addr) \
224 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
225 sizeof(ip_vs_dbg_buf), addr, \
226 &ip_vs_dbg_idx)
227
228#define IP_VS_DBG(level, msg, ...) \
229 do { \
230 if (level <= ip_vs_get_debug_level()) \
231 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
232 } while (0)
233#define IP_VS_DBG_RL(msg, ...) \
234 do { \
235 if (net_ratelimit()) \
236 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
237 } while (0)
238#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
239 do { \
240 if (level <= ip_vs_get_debug_level()) \
241 pp->debug_packet(af, pp, skb, ofs, msg); \
242 } while (0)
243#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
244 do { \
245 if (level <= ip_vs_get_debug_level() && \
246 net_ratelimit()) \
247 pp->debug_packet(af, pp, skb, ofs, msg); \
248 } while (0)
249#else /* NO DEBUGGING at ALL */
250#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
251#define IP_VS_ERR_BUF(msg...) do {} while (0)
252#define IP_VS_DBG(level, msg...) do {} while (0)
253#define IP_VS_DBG_RL(msg...) do {} while (0)
254#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
255#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
256#endif
257
258#define IP_VS_BUG() BUG()
259#define IP_VS_ERR_RL(msg, ...) \
260 do { \
261 if (net_ratelimit()) \
262 pr_err(msg, ##__VA_ARGS__); \
263 } while (0)
264
265#ifdef CONFIG_IP_VS_DEBUG
266#define EnterFunction(level) \
267 do { \
268 if (level <= ip_vs_get_debug_level()) \
269 printk(KERN_DEBUG \
270 pr_fmt("Enter: %s, %s line %i\n"), \
271 __func__, __FILE__, __LINE__); \
272 } while (0)
273#define LeaveFunction(level) \
274 do { \
275 if (level <= ip_vs_get_debug_level()) \
276 printk(KERN_DEBUG \
277 pr_fmt("Leave: %s, %s line %i\n"), \
278 __func__, __FILE__, __LINE__); \
279 } while (0)
280#else
281#define EnterFunction(level) do {} while (0)
282#define LeaveFunction(level) do {} while (0)
283#endif
284
285/* The port number of FTP service (in network order). */
286#define FTPPORT cpu_to_be16(21)
287#define FTPDATA cpu_to_be16(20)
288
289/* TCP State Values */
290enum {
291 IP_VS_TCP_S_NONE = 0,
292 IP_VS_TCP_S_ESTABLISHED,
293 IP_VS_TCP_S_SYN_SENT,
294 IP_VS_TCP_S_SYN_RECV,
295 IP_VS_TCP_S_FIN_WAIT,
296 IP_VS_TCP_S_TIME_WAIT,
297 IP_VS_TCP_S_CLOSE,
298 IP_VS_TCP_S_CLOSE_WAIT,
299 IP_VS_TCP_S_LAST_ACK,
300 IP_VS_TCP_S_LISTEN,
301 IP_VS_TCP_S_SYNACK,
302 IP_VS_TCP_S_LAST
303};
304
305/* UDP State Values */
306enum {
307 IP_VS_UDP_S_NORMAL,
308 IP_VS_UDP_S_LAST,
309};
310
311/* ICMP State Values */
312enum {
313 IP_VS_ICMP_S_NORMAL,
314 IP_VS_ICMP_S_LAST,
315};
316
317/* SCTP State Values */
318enum ip_vs_sctp_states {
319 IP_VS_SCTP_S_NONE,
320 IP_VS_SCTP_S_INIT1,
321 IP_VS_SCTP_S_INIT,
322 IP_VS_SCTP_S_COOKIE_SENT,
323 IP_VS_SCTP_S_COOKIE_REPLIED,
324 IP_VS_SCTP_S_COOKIE_WAIT,
325 IP_VS_SCTP_S_COOKIE,
326 IP_VS_SCTP_S_COOKIE_ECHOED,
327 IP_VS_SCTP_S_ESTABLISHED,
328 IP_VS_SCTP_S_SHUTDOWN_SENT,
329 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
330 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
331 IP_VS_SCTP_S_REJECTED,
332 IP_VS_SCTP_S_CLOSED,
333 IP_VS_SCTP_S_LAST
334};
335
336/* Connection templates use bits from state */
337#define IP_VS_CTPL_S_NONE 0x0000
338#define IP_VS_CTPL_S_ASSURED 0x0001
339#define IP_VS_CTPL_S_LAST 0x0002
340
341/* Delta sequence info structure
342 * Each ip_vs_conn has 2 (output AND input seq. changes).
343 * Only used in the VS/NAT.
344 */
345struct ip_vs_seq {
346 __u32 init_seq; /* Add delta from this seq */
347 __u32 delta; /* Delta in sequence numbers */
348 __u32 previous_delta; /* Delta in sequence numbers
349 * before last resized pkt */
350};
351
352/* counters per cpu */
353struct ip_vs_counters {
354 __u64 conns; /* connections scheduled */
355 __u64 inpkts; /* incoming packets */
356 __u64 outpkts; /* outgoing packets */
357 __u64 inbytes; /* incoming bytes */
358 __u64 outbytes; /* outgoing bytes */
359};
360/* Stats per cpu */
361struct ip_vs_cpu_stats {
362 struct ip_vs_counters cnt;
363 struct u64_stats_sync syncp;
364};
365
366/* IPVS statistics objects */
367struct ip_vs_estimator {
368 struct list_head list;
369
370 u64 last_inbytes;
371 u64 last_outbytes;
372 u64 last_conns;
373 u64 last_inpkts;
374 u64 last_outpkts;
375
376 u64 cps;
377 u64 inpps;
378 u64 outpps;
379 u64 inbps;
380 u64 outbps;
381};
382
383/*
384 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
385 */
386struct ip_vs_kstats {
387 u64 conns; /* connections scheduled */
388 u64 inpkts; /* incoming packets */
389 u64 outpkts; /* outgoing packets */
390 u64 inbytes; /* incoming bytes */
391 u64 outbytes; /* outgoing bytes */
392
393 u64 cps; /* current connection rate */
394 u64 inpps; /* current in packet rate */
395 u64 outpps; /* current out packet rate */
396 u64 inbps; /* current in byte rate */
397 u64 outbps; /* current out byte rate */
398};
399
400struct ip_vs_stats {
401 struct ip_vs_kstats kstats; /* kernel statistics */
402 struct ip_vs_estimator est; /* estimator */
403 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
404 spinlock_t lock; /* spin lock */
405 struct ip_vs_kstats kstats0; /* reset values */
406};
407
408struct dst_entry;
409struct iphdr;
410struct ip_vs_conn;
411struct ip_vs_app;
412struct sk_buff;
413struct ip_vs_proto_data;
414
415struct ip_vs_protocol {
416 struct ip_vs_protocol *next;
417 char *name;
418 u16 protocol;
419 u16 num_states;
420 int dont_defrag;
421
422 void (*init)(struct ip_vs_protocol *pp);
423
424 void (*exit)(struct ip_vs_protocol *pp);
425
426 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
427
428 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
429
430 int (*conn_schedule)(struct netns_ipvs *ipvs,
431 int af, struct sk_buff *skb,
432 struct ip_vs_proto_data *pd,
433 int *verdict, struct ip_vs_conn **cpp,
434 struct ip_vs_iphdr *iph);
435
436 struct ip_vs_conn *
437 (*conn_in_get)(struct netns_ipvs *ipvs,
438 int af,
439 const struct sk_buff *skb,
440 const struct ip_vs_iphdr *iph);
441
442 struct ip_vs_conn *
443 (*conn_out_get)(struct netns_ipvs *ipvs,
444 int af,
445 const struct sk_buff *skb,
446 const struct ip_vs_iphdr *iph);
447
448 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
449 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
450
451 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
452 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
453
454 const char *(*state_name)(int state);
455
456 void (*state_transition)(struct ip_vs_conn *cp, int direction,
457 const struct sk_buff *skb,
458 struct ip_vs_proto_data *pd);
459
460 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
461
462 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
463
464 int (*app_conn_bind)(struct ip_vs_conn *cp);
465
466 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
467 const struct sk_buff *skb,
468 int offset,
469 const char *msg);
470
471 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
472};
473
474/* protocol data per netns */
475struct ip_vs_proto_data {
476 struct ip_vs_proto_data *next;
477 struct ip_vs_protocol *pp;
478 int *timeout_table; /* protocol timeout table */
479 atomic_t appcnt; /* counter of proto app incs. */
480 struct tcp_states_t *tcp_state_table;
481};
482
483struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
484struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
485 unsigned short proto);
486
487struct ip_vs_conn_param {
488 struct netns_ipvs *ipvs;
489 const union nf_inet_addr *caddr;
490 const union nf_inet_addr *vaddr;
491 __be16 cport;
492 __be16 vport;
493 __u16 protocol;
494 u16 af;
495
496 const struct ip_vs_pe *pe;
497 char *pe_data;
498 __u8 pe_data_len;
499};
500
501/* IP_VS structure allocated for each dynamically scheduled connection */
502struct ip_vs_conn {
503 struct hlist_node c_list; /* hashed list heads */
504 /* Protocol, addresses and port numbers */
505 __be16 cport;
506 __be16 dport;
507 __be16 vport;
508 u16 af; /* address family */
509 union nf_inet_addr caddr; /* client address */
510 union nf_inet_addr vaddr; /* virtual address */
511 union nf_inet_addr daddr; /* destination address */
512 volatile __u32 flags; /* status flags */
513 __u16 protocol; /* Which protocol (TCP/UDP) */
514 __u16 daf; /* Address family of the dest */
515 struct netns_ipvs *ipvs;
516
517 /* counter and timer */
518 refcount_t refcnt; /* reference count */
519 struct timer_list timer; /* Expiration timer */
520 volatile unsigned long timeout; /* timeout */
521
522 /* Flags and state transition */
523 spinlock_t lock; /* lock for state transition */
524 volatile __u16 state; /* state info */
525 volatile __u16 old_state; /* old state, to be used for
526 * state transition triggerd
527 * synchronization
528 */
529 __u32 fwmark; /* Fire wall mark from skb */
530 unsigned long sync_endtime; /* jiffies + sent_retries */
531
532 /* Control members */
533 struct ip_vs_conn *control; /* Master control connection */
534 atomic_t n_control; /* Number of controlled ones */
535 struct ip_vs_dest *dest; /* real server */
536 atomic_t in_pkts; /* incoming packet counter */
537
538 /* Packet transmitter for different forwarding methods. If it
539 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
540 * otherwise this must be changed to a sk_buff **.
541 * NF_ACCEPT can be returned when destination is local.
542 */
543 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
544 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
545
546 /* Note: we can group the following members into a structure,
547 * in order to save more space, and the following members are
548 * only used in VS/NAT anyway
549 */
550 struct ip_vs_app *app; /* bound ip_vs_app object */
551 void *app_data; /* Application private data */
552 struct ip_vs_seq in_seq; /* incoming seq. struct */
553 struct ip_vs_seq out_seq; /* outgoing seq. struct */
554
555 const struct ip_vs_pe *pe;
556 char *pe_data;
557 __u8 pe_data_len;
558
559 struct rcu_head rcu_head;
560};
561
562/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
563 * for IPv6 support.
564 *
565 * We need these to conveniently pass around service and destination
566 * options, but unfortunately, we also need to keep the old definitions to
567 * maintain userspace backwards compatibility for the setsockopt interface.
568 */
569struct ip_vs_service_user_kern {
570 /* virtual service addresses */
571 u16 af;
572 u16 protocol;
573 union nf_inet_addr addr; /* virtual ip address */
574 __be16 port;
575 u32 fwmark; /* firwall mark of service */
576
577 /* virtual service options */
578 char *sched_name;
579 char *pe_name;
580 unsigned int flags; /* virtual service flags */
581 unsigned int timeout; /* persistent timeout in sec */
582 __be32 netmask; /* persistent netmask or plen */
583};
584
585
586struct ip_vs_dest_user_kern {
587 /* destination server address */
588 union nf_inet_addr addr;
589 __be16 port;
590
591 /* real server options */
592 unsigned int conn_flags; /* connection flags */
593 int weight; /* destination weight */
594
595 /* thresholds for active connections */
596 u32 u_threshold; /* upper threshold */
597 u32 l_threshold; /* lower threshold */
598
599 /* Address family of addr */
600 u16 af;
601
602 u16 tun_type; /* tunnel type */
603 __be16 tun_port; /* tunnel port */
604 u16 tun_flags; /* tunnel flags */
605};
606
607
608/*
609 * The information about the virtual service offered to the net and the
610 * forwarding entries.
611 */
612struct ip_vs_service {
613 struct hlist_node s_list; /* for normal service table */
614 struct hlist_node f_list; /* for fwmark-based service table */
615 atomic_t refcnt; /* reference counter */
616
617 u16 af; /* address family */
618 __u16 protocol; /* which protocol (TCP/UDP) */
619 union nf_inet_addr addr; /* IP address for virtual service */
620 __be16 port; /* port number for the service */
621 __u32 fwmark; /* firewall mark of the service */
622 unsigned int flags; /* service status flags */
623 unsigned int timeout; /* persistent timeout in ticks */
624 __be32 netmask; /* grouping granularity, mask/plen */
625 struct netns_ipvs *ipvs;
626
627 struct list_head destinations; /* real server d-linked list */
628 __u32 num_dests; /* number of servers */
629 struct ip_vs_stats stats; /* statistics for the service */
630
631 /* for scheduling */
632 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
633 spinlock_t sched_lock; /* lock sched_data */
634 void *sched_data; /* scheduler application data */
635
636 /* alternate persistence engine */
637 struct ip_vs_pe __rcu *pe;
638 int conntrack_afmask;
639
640 struct rcu_head rcu_head;
641};
642
643/* Information for cached dst */
644struct ip_vs_dest_dst {
645 struct dst_entry *dst_cache; /* destination cache entry */
646 u32 dst_cookie;
647 union nf_inet_addr dst_saddr;
648 struct rcu_head rcu_head;
649};
650
651/* The real server destination forwarding entry with ip address, port number,
652 * and so on.
653 */
654struct ip_vs_dest {
655 struct list_head n_list; /* for the dests in the service */
656 struct hlist_node d_list; /* for table with all the dests */
657
658 u16 af; /* address family */
659 __be16 port; /* port number of the server */
660 union nf_inet_addr addr; /* IP address of the server */
661 volatile unsigned int flags; /* dest status flags */
662 atomic_t conn_flags; /* flags to copy to conn */
663 atomic_t weight; /* server weight */
664 atomic_t last_weight; /* server latest weight */
665 __u16 tun_type; /* tunnel type */
666 __be16 tun_port; /* tunnel port */
667 __u16 tun_flags; /* tunnel flags */
668
669 refcount_t refcnt; /* reference counter */
670 struct ip_vs_stats stats; /* statistics */
671 unsigned long idle_start; /* start time, jiffies */
672
673 /* connection counters and thresholds */
674 atomic_t activeconns; /* active connections */
675 atomic_t inactconns; /* inactive connections */
676 atomic_t persistconns; /* persistent connections */
677 __u32 u_threshold; /* upper threshold */
678 __u32 l_threshold; /* lower threshold */
679
680 /* for destination cache */
681 spinlock_t dst_lock; /* lock of dst_cache */
682 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
683
684 /* for virtual service */
685 struct ip_vs_service __rcu *svc; /* service it belongs to */
686 __u16 protocol; /* which protocol (TCP/UDP) */
687 __be16 vport; /* virtual port number */
688 union nf_inet_addr vaddr; /* virtual IP address */
689 __u32 vfwmark; /* firewall mark of service */
690
691 struct list_head t_list; /* in dest_trash */
692 unsigned int in_rs_table:1; /* we are in rs_table */
693};
694
695/* The scheduler object */
696struct ip_vs_scheduler {
697 struct list_head n_list; /* d-linked list head */
698 char *name; /* scheduler name */
699 atomic_t refcnt; /* reference counter */
700 struct module *module; /* THIS_MODULE/NULL */
701
702 /* scheduler initializing service */
703 int (*init_service)(struct ip_vs_service *svc);
704 /* scheduling service finish */
705 void (*done_service)(struct ip_vs_service *svc);
706 /* dest is linked */
707 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
708 /* dest is unlinked */
709 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is updated */
711 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712
713 /* selecting a server from the given service */
714 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
715 const struct sk_buff *skb,
716 struct ip_vs_iphdr *iph);
717};
718
719/* The persistence engine object */
720struct ip_vs_pe {
721 struct list_head n_list; /* d-linked list head */
722 char *name; /* scheduler name */
723 atomic_t refcnt; /* reference counter */
724 struct module *module; /* THIS_MODULE/NULL */
725
726 /* get the connection template, if any */
727 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
728 bool (*ct_match)(const struct ip_vs_conn_param *p,
729 struct ip_vs_conn *ct);
730 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
731 bool inverse);
732 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
733 /* create connections for real-server outgoing packets */
734 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
735 struct ip_vs_dest *dest,
736 struct sk_buff *skb,
737 const struct ip_vs_iphdr *iph,
738 __be16 dport, __be16 cport);
739};
740
741/* The application module object (a.k.a. app incarnation) */
742struct ip_vs_app {
743 struct list_head a_list; /* member in app list */
744 int type; /* IP_VS_APP_TYPE_xxx */
745 char *name; /* application module name */
746 __u16 protocol;
747 struct module *module; /* THIS_MODULE/NULL */
748 struct list_head incs_list; /* list of incarnations */
749
750 /* members for application incarnations */
751 struct list_head p_list; /* member in proto app list */
752 struct ip_vs_app *app; /* its real application */
753 __be16 port; /* port number in net order */
754 atomic_t usecnt; /* usage counter */
755 struct rcu_head rcu_head;
756
757 /* output hook: Process packet in inout direction, diff set for TCP.
758 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
759 * 2=Mangled but checksum was not updated
760 */
761 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
762 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
763
764 /* input hook: Process packet in outin direction, diff set for TCP.
765 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
766 * 2=Mangled but checksum was not updated
767 */
768 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
769 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
770
771 /* ip_vs_app initializer */
772 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
773
774 /* ip_vs_app finish */
775 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
776
777
778 /* not used now */
779 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
780 struct ip_vs_protocol *);
781
782 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
783
784 int * timeout_table;
785 int * timeouts;
786 int timeouts_size;
787
788 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
789 int *verdict, struct ip_vs_conn **cpp);
790
791 struct ip_vs_conn *
792 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
793 const struct iphdr *iph, int inverse);
794
795 struct ip_vs_conn *
796 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
797 const struct iphdr *iph, int inverse);
798
799 int (*state_transition)(struct ip_vs_conn *cp, int direction,
800 const struct sk_buff *skb,
801 struct ip_vs_app *app);
802
803 void (*timeout_change)(struct ip_vs_app *app, int flags);
804};
805
806struct ipvs_master_sync_state {
807 struct list_head sync_queue;
808 struct ip_vs_sync_buff *sync_buff;
809 unsigned long sync_queue_len;
810 unsigned int sync_queue_delay;
811 struct delayed_work master_wakeup_work;
812 struct netns_ipvs *ipvs;
813};
814
815struct ip_vs_sync_thread_data;
816
817/* How much time to keep dests in trash */
818#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
819
820struct ipvs_sync_daemon_cfg {
821 union nf_inet_addr mcast_group;
822 int syncid;
823 u16 sync_maxlen;
824 u16 mcast_port;
825 u8 mcast_af;
826 u8 mcast_ttl;
827 /* multicast interface name */
828 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
829};
830
831/* IPVS in network namespace */
832struct netns_ipvs {
833 int gen; /* Generation */
834 int enable; /* enable like nf_hooks do */
835 /* Hash table: for real service lookups */
836 #define IP_VS_RTAB_BITS 4
837 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
838 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
839
840 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
841 /* ip_vs_app */
842 struct list_head app_list;
843 /* ip_vs_proto */
844 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
845 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
846 /* ip_vs_proto_tcp */
847#ifdef CONFIG_IP_VS_PROTO_TCP
848 #define TCP_APP_TAB_BITS 4
849 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
850 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
851 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
852#endif
853 /* ip_vs_proto_udp */
854#ifdef CONFIG_IP_VS_PROTO_UDP
855 #define UDP_APP_TAB_BITS 4
856 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
857 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
858 struct list_head udp_apps[UDP_APP_TAB_SIZE];
859#endif
860 /* ip_vs_proto_sctp */
861#ifdef CONFIG_IP_VS_PROTO_SCTP
862 #define SCTP_APP_TAB_BITS 4
863 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
864 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
865 /* Hash table for SCTP application incarnations */
866 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
867#endif
868 /* ip_vs_conn */
869 atomic_t conn_count; /* connection counter */
870
871 /* ip_vs_ctl */
872 struct ip_vs_stats tot_stats; /* Statistics & est. */
873
874 int num_services; /* no of virtual services */
875 int num_services6; /* IPv6 virtual services */
876
877 /* Trash for destinations */
878 struct list_head dest_trash;
879 spinlock_t dest_trash_lock;
880 struct timer_list dest_trash_timer; /* expiration timer */
881 /* Service counters */
882 atomic_t ftpsvc_counter;
883 atomic_t nullsvc_counter;
884 atomic_t conn_out_counter;
885
886#ifdef CONFIG_SYSCTL
887 /* delayed work for expiring no dest connections */
888 struct delayed_work expire_nodest_conn_work;
889 /* 1/rate drop and drop-entry variables */
890 struct delayed_work defense_work; /* Work handler */
891 int drop_rate;
892 int drop_counter;
893 int old_secure_tcp;
894 atomic_t dropentry;
895 /* locks in ctl.c */
896 spinlock_t dropentry_lock; /* drop entry handling */
897 spinlock_t droppacket_lock; /* drop packet handling */
898 spinlock_t securetcp_lock; /* state and timeout tables */
899
900 /* sys-ctl struct */
901 struct ctl_table_header *sysctl_hdr;
902 struct ctl_table *sysctl_tbl;
903#endif
904
905 /* sysctl variables */
906 int sysctl_amemthresh;
907 int sysctl_am_droprate;
908 int sysctl_drop_entry;
909 int sysctl_drop_packet;
910 int sysctl_secure_tcp;
911#ifdef CONFIG_IP_VS_NFCT
912 int sysctl_conntrack;
913#endif
914 int sysctl_snat_reroute;
915 int sysctl_sync_ver;
916 int sysctl_sync_ports;
917 int sysctl_sync_persist_mode;
918 unsigned long sysctl_sync_qlen_max;
919 int sysctl_sync_sock_size;
920 int sysctl_cache_bypass;
921 int sysctl_expire_nodest_conn;
922 int sysctl_sloppy_tcp;
923 int sysctl_sloppy_sctp;
924 int sysctl_expire_quiescent_template;
925 int sysctl_sync_threshold[2];
926 unsigned int sysctl_sync_refresh_period;
927 int sysctl_sync_retries;
928 int sysctl_nat_icmp_send;
929 int sysctl_pmtu_disc;
930 int sysctl_backup_only;
931 int sysctl_conn_reuse_mode;
932 int sysctl_schedule_icmp;
933 int sysctl_ignore_tunneled;
934
935 /* ip_vs_lblc */
936 int sysctl_lblc_expiration;
937 struct ctl_table_header *lblc_ctl_header;
938 struct ctl_table *lblc_ctl_table;
939 /* ip_vs_lblcr */
940 int sysctl_lblcr_expiration;
941 struct ctl_table_header *lblcr_ctl_header;
942 struct ctl_table *lblcr_ctl_table;
943 /* ip_vs_est */
944 struct list_head est_list; /* estimator list */
945 spinlock_t est_lock;
946 struct timer_list est_timer; /* Estimation timer */
947 /* ip_vs_sync */
948 spinlock_t sync_lock;
949 struct ipvs_master_sync_state *ms;
950 spinlock_t sync_buff_lock;
951 struct ip_vs_sync_thread_data *master_tinfo;
952 struct ip_vs_sync_thread_data *backup_tinfo;
953 int threads_mask;
954 volatile int sync_state;
955 struct mutex sync_mutex;
956 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
957 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
958 /* net name space ptr */
959 struct net *net; /* Needed by timer routines */
960 /* Number of heterogeneous destinations, needed becaus heterogeneous
961 * are not supported when synchronization is enabled.
962 */
963 unsigned int mixed_address_family_dests;
964 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
965};
966
967#define DEFAULT_SYNC_THRESHOLD 3
968#define DEFAULT_SYNC_PERIOD 50
969#define DEFAULT_SYNC_VER 1
970#define DEFAULT_SLOPPY_TCP 0
971#define DEFAULT_SLOPPY_SCTP 0
972#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
973#define DEFAULT_SYNC_RETRIES 0
974#define IPVS_SYNC_WAKEUP_RATE 8
975#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
976#define IPVS_SYNC_SEND_DELAY (HZ / 50)
977#define IPVS_SYNC_CHECK_PERIOD HZ
978#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
979#define IPVS_SYNC_PORTS_MAX (1 << 6)
980
981#ifdef CONFIG_SYSCTL
982
983static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
984{
985 return ipvs->sysctl_sync_threshold[0];
986}
987
988static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
989{
990 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
991}
992
993static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
994{
995 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
996}
997
998static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
999{
1000 return ipvs->sysctl_sync_retries;
1001}
1002
1003static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1004{
1005 return ipvs->sysctl_sync_ver;
1006}
1007
1008static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1009{
1010 return ipvs->sysctl_sloppy_tcp;
1011}
1012
1013static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1014{
1015 return ipvs->sysctl_sloppy_sctp;
1016}
1017
1018static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1019{
1020 return READ_ONCE(ipvs->sysctl_sync_ports);
1021}
1022
1023static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1024{
1025 return ipvs->sysctl_sync_persist_mode;
1026}
1027
1028static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1029{
1030 return ipvs->sysctl_sync_qlen_max;
1031}
1032
1033static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1034{
1035 return ipvs->sysctl_sync_sock_size;
1036}
1037
1038static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1039{
1040 return ipvs->sysctl_pmtu_disc;
1041}
1042
1043static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1044{
1045 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1046 ipvs->sysctl_backup_only;
1047}
1048
1049static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1050{
1051 return ipvs->sysctl_conn_reuse_mode;
1052}
1053
1054static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1055{
1056 return ipvs->sysctl_expire_nodest_conn;
1057}
1058
1059static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1060{
1061 return ipvs->sysctl_schedule_icmp;
1062}
1063
1064static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1065{
1066 return ipvs->sysctl_ignore_tunneled;
1067}
1068
1069static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1070{
1071 return ipvs->sysctl_cache_bypass;
1072}
1073
1074#else
1075
1076static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1077{
1078 return DEFAULT_SYNC_THRESHOLD;
1079}
1080
1081static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1082{
1083 return DEFAULT_SYNC_PERIOD;
1084}
1085
1086static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1087{
1088 return DEFAULT_SYNC_REFRESH_PERIOD;
1089}
1090
1091static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1092{
1093 return DEFAULT_SYNC_RETRIES & 3;
1094}
1095
1096static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1097{
1098 return DEFAULT_SYNC_VER;
1099}
1100
1101static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1102{
1103 return DEFAULT_SLOPPY_TCP;
1104}
1105
1106static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1107{
1108 return DEFAULT_SLOPPY_SCTP;
1109}
1110
1111static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1112{
1113 return 1;
1114}
1115
1116static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1117{
1118 return 0;
1119}
1120
1121static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1122{
1123 return IPVS_SYNC_QLEN_MAX;
1124}
1125
1126static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1127{
1128 return 0;
1129}
1130
1131static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1132{
1133 return 1;
1134}
1135
1136static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1137{
1138 return 0;
1139}
1140
1141static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1142{
1143 return 1;
1144}
1145
1146static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1147{
1148 return 0;
1149}
1150
1151static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1152{
1153 return 0;
1154}
1155
1156static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1157{
1158 return 0;
1159}
1160
1161static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1162{
1163 return 0;
1164}
1165
1166#endif
1167
1168/* IPVS core functions
1169 * (from ip_vs_core.c)
1170 */
1171const char *ip_vs_proto_name(unsigned int proto);
1172void ip_vs_init_hash_table(struct list_head *table, int rows);
1173struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1174 struct ip_vs_dest *dest,
1175 struct sk_buff *skb,
1176 const struct ip_vs_iphdr *iph,
1177 __be16 dport,
1178 __be16 cport);
1179#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1180
1181#define IP_VS_APP_TYPE_FTP 1
1182
1183/* ip_vs_conn handling functions
1184 * (from ip_vs_conn.c)
1185 */
1186enum {
1187 IP_VS_DIR_INPUT = 0,
1188 IP_VS_DIR_OUTPUT,
1189 IP_VS_DIR_INPUT_ONLY,
1190 IP_VS_DIR_LAST,
1191};
1192
1193static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1194 const union nf_inet_addr *caddr,
1195 __be16 cport,
1196 const union nf_inet_addr *vaddr,
1197 __be16 vport,
1198 struct ip_vs_conn_param *p)
1199{
1200 p->ipvs = ipvs;
1201 p->af = af;
1202 p->protocol = protocol;
1203 p->caddr = caddr;
1204 p->cport = cport;
1205 p->vaddr = vaddr;
1206 p->vport = vport;
1207 p->pe = NULL;
1208 p->pe_data = NULL;
1209}
1210
1211struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1212struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1213
1214struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1215 const struct sk_buff *skb,
1216 const struct ip_vs_iphdr *iph);
1217
1218struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1219
1220struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1221 const struct sk_buff *skb,
1222 const struct ip_vs_iphdr *iph);
1223
1224/* Get reference to gain full access to conn.
1225 * By default, RCU read-side critical sections have access only to
1226 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1227 */
1228static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1229{
1230 return refcount_inc_not_zero(&cp->refcnt);
1231}
1232
1233/* put back the conn without restarting its timer */
1234static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1235{
1236 smp_mb__before_atomic();
1237 refcount_dec(&cp->refcnt);
1238}
1239void ip_vs_conn_put(struct ip_vs_conn *cp);
1240void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1241
1242struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1243 const union nf_inet_addr *daddr,
1244 __be16 dport, unsigned int flags,
1245 struct ip_vs_dest *dest, __u32 fwmark);
1246void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1247
1248const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1249
1250void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1251int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1252void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1253int ip_vs_conn_init(void);
1254void ip_vs_conn_cleanup(void);
1255
1256static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1257{
1258 struct ip_vs_conn *ctl_cp = cp->control;
1259 if (!ctl_cp) {
1260 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1261 "%s:%d to %s:%d\n",
1262 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1263 ntohs(cp->cport),
1264 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1265 ntohs(cp->vport));
1266
1267 return;
1268 }
1269
1270 IP_VS_DBG_BUF(7, "DELeting control for: "
1271 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1272 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1273 ntohs(cp->cport),
1274 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1275 ntohs(ctl_cp->cport));
1276
1277 cp->control = NULL;
1278 if (atomic_read(&ctl_cp->n_control) == 0) {
1279 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1280 "%s:%d to %s:%d\n",
1281 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1282 ntohs(cp->cport),
1283 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1284 ntohs(cp->vport));
1285
1286 return;
1287 }
1288 atomic_dec(&ctl_cp->n_control);
1289}
1290
1291static inline void
1292ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1293{
1294 if (cp->control) {
1295 IP_VS_ERR_BUF("request control ADD for already controlled: "
1296 "%s:%d to %s:%d\n",
1297 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1298 ntohs(cp->cport),
1299 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1300 ntohs(cp->vport));
1301
1302 ip_vs_control_del(cp);
1303 }
1304
1305 IP_VS_DBG_BUF(7, "ADDing control for: "
1306 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1307 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1308 ntohs(cp->cport),
1309 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1310 ntohs(ctl_cp->cport));
1311
1312 cp->control = ctl_cp;
1313 atomic_inc(&ctl_cp->n_control);
1314}
1315
1316/* Mark our template as assured */
1317static inline void
1318ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1319{
1320 struct ip_vs_conn *ct = cp->control;
1321
1322 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1323 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1324 ct->state |= IP_VS_CTPL_S_ASSURED;
1325}
1326
1327/* IPVS netns init & cleanup functions */
1328int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1329int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1330int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1331int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1332int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1333int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1334void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1335void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1336void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1337void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1338void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1339void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1340void ip_vs_service_nets_cleanup(struct list_head *net_list);
1341
1342/* IPVS application functions
1343 * (from ip_vs_app.c)
1344 */
1345#define IP_VS_APP_MAX_PORTS 8
1346struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1347void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1348int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1349void ip_vs_unbind_app(struct ip_vs_conn *cp);
1350int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1351 __u16 port);
1352int ip_vs_app_inc_get(struct ip_vs_app *inc);
1353void ip_vs_app_inc_put(struct ip_vs_app *inc);
1354
1355int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1356 struct ip_vs_iphdr *ipvsh);
1357int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1358 struct ip_vs_iphdr *ipvsh);
1359
1360int register_ip_vs_pe(struct ip_vs_pe *pe);
1361int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1362struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1363struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1364
1365/* Use a #define to avoid all of module.h just for these trivial ops */
1366#define ip_vs_pe_get(pe) \
1367 if (pe && pe->module) \
1368 __module_get(pe->module);
1369
1370#define ip_vs_pe_put(pe) \
1371 if (pe && pe->module) \
1372 module_put(pe->module);
1373
1374/* IPVS protocol functions (from ip_vs_proto.c) */
1375int ip_vs_protocol_init(void);
1376void ip_vs_protocol_cleanup(void);
1377void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1378int *ip_vs_create_timeout_table(int *table, int size);
1379void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1380 const struct sk_buff *skb, int offset,
1381 const char *msg);
1382
1383extern struct ip_vs_protocol ip_vs_protocol_tcp;
1384extern struct ip_vs_protocol ip_vs_protocol_udp;
1385extern struct ip_vs_protocol ip_vs_protocol_icmp;
1386extern struct ip_vs_protocol ip_vs_protocol_esp;
1387extern struct ip_vs_protocol ip_vs_protocol_ah;
1388extern struct ip_vs_protocol ip_vs_protocol_sctp;
1389
1390/* Registering/unregistering scheduler functions
1391 * (from ip_vs_sched.c)
1392 */
1393int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1394int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1395int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1396 struct ip_vs_scheduler *scheduler);
1397void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1398 struct ip_vs_scheduler *sched);
1399struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1400void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1401struct ip_vs_conn *
1402ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1403 struct ip_vs_proto_data *pd, int *ignored,
1404 struct ip_vs_iphdr *iph);
1405int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1406 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1407
1408void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1409
1410/* IPVS control data and functions (from ip_vs_ctl.c) */
1411extern struct ip_vs_stats ip_vs_stats;
1412extern int sysctl_ip_vs_sync_ver;
1413
1414struct ip_vs_service *
1415ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1416 const union nf_inet_addr *vaddr, __be16 vport);
1417
1418bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1419 const union nf_inet_addr *daddr, __be16 dport);
1420
1421struct ip_vs_dest *
1422ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1423 const union nf_inet_addr *daddr, __be16 dport);
1424struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1425 const union nf_inet_addr *daddr,
1426 __be16 tun_port);
1427
1428int ip_vs_use_count_inc(void);
1429void ip_vs_use_count_dec(void);
1430int ip_vs_register_nl_ioctl(void);
1431void ip_vs_unregister_nl_ioctl(void);
1432int ip_vs_control_init(void);
1433void ip_vs_control_cleanup(void);
1434struct ip_vs_dest *
1435ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1436 const union nf_inet_addr *daddr, __be16 dport,
1437 const union nf_inet_addr *vaddr, __be16 vport,
1438 __u16 protocol, __u32 fwmark, __u32 flags);
1439void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1440
1441static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1442{
1443 refcount_inc(&dest->refcnt);
1444}
1445
1446static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1447{
1448 smp_mb__before_atomic();
1449 refcount_dec(&dest->refcnt);
1450}
1451
1452static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1453{
1454 if (refcount_dec_and_test(&dest->refcnt))
1455 kfree(dest);
1456}
1457
1458/* IPVS sync daemon data and function prototypes
1459 * (from ip_vs_sync.c)
1460 */
1461int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1462 int state);
1463int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1464void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1465
1466/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1467void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1468void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1469void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1470void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1471
1472/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1473int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1474 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1475int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1476 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1477int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1478 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, int offset,
1485 unsigned int hooknum, struct ip_vs_iphdr *iph);
1486void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1487
1488#ifdef CONFIG_IP_VS_IPV6
1489int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1490 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1491int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1492 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1493int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1494 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1495int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1496 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1497int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1498 struct ip_vs_protocol *pp, int offset,
1499 unsigned int hooknum, struct ip_vs_iphdr *iph);
1500#endif
1501
1502#ifdef CONFIG_SYSCTL
1503/* This is a simple mechanism to ignore packets when
1504 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1505 * we start to drop 1/rate of the packets
1506 */
1507static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1508{
1509 if (!ipvs->drop_rate)
1510 return 0;
1511 if (--ipvs->drop_counter > 0)
1512 return 0;
1513 ipvs->drop_counter = ipvs->drop_rate;
1514 return 1;
1515}
1516#else
1517static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1518#endif
1519
1520#ifdef CONFIG_SYSCTL
1521/* Enqueue delayed work for expiring no dest connections
1522 * Only run when sysctl_expire_nodest=1
1523 */
1524static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1525{
1526 if (sysctl_expire_nodest_conn(ipvs))
1527 queue_delayed_work(system_long_wq,
1528 &ipvs->expire_nodest_conn_work, 1);
1529}
1530
1531void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1532#else
1533static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1534#endif
1535
1536#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1537 IP_VS_CONN_F_FWD_MASK)
1538
1539/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1540#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1541
1542static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1543{
1544 char fwd;
1545
1546 switch (IP_VS_FWD_METHOD(cp)) {
1547 case IP_VS_CONN_F_MASQ:
1548 fwd = 'M'; break;
1549 case IP_VS_CONN_F_LOCALNODE:
1550 fwd = 'L'; break;
1551 case IP_VS_CONN_F_TUNNEL:
1552 fwd = 'T'; break;
1553 case IP_VS_CONN_F_DROUTE:
1554 fwd = 'R'; break;
1555 case IP_VS_CONN_F_BYPASS:
1556 fwd = 'B'; break;
1557 default:
1558 fwd = '?'; break;
1559 }
1560 return fwd;
1561}
1562
1563void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1564 struct ip_vs_conn *cp, int dir);
1565
1566#ifdef CONFIG_IP_VS_IPV6
1567void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1568 struct ip_vs_conn *cp, int dir);
1569#endif
1570
1571__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1572
1573static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1574{
1575 __be32 diff[2] = { ~old, new };
1576
1577 return csum_partial(diff, sizeof(diff), oldsum);
1578}
1579
1580#ifdef CONFIG_IP_VS_IPV6
1581static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1582 __wsum oldsum)
1583{
1584 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1585 new[3], new[2], new[1], new[0] };
1586
1587 return csum_partial(diff, sizeof(diff), oldsum);
1588}
1589#endif
1590
1591static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1592{
1593 __be16 diff[2] = { ~old, new };
1594
1595 return csum_partial(diff, sizeof(diff), oldsum);
1596}
1597
1598/* Forget current conntrack (unconfirmed) and attach notrack entry */
1599static inline void ip_vs_notrack(struct sk_buff *skb)
1600{
1601#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1602 enum ip_conntrack_info ctinfo;
1603 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1604
1605 if (ct) {
1606 nf_conntrack_put(&ct->ct_general);
1607 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1608 }
1609#endif
1610}
1611
1612#ifdef CONFIG_IP_VS_NFCT
1613/* Netfilter connection tracking
1614 * (from ip_vs_nfct.c)
1615 */
1616static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1617{
1618#ifdef CONFIG_SYSCTL
1619 return ipvs->sysctl_conntrack;
1620#else
1621 return 0;
1622#endif
1623}
1624
1625void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1626 int outin);
1627int ip_vs_confirm_conntrack(struct sk_buff *skb);
1628void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1629 struct ip_vs_conn *cp, u_int8_t proto,
1630 const __be16 port, int from_rs);
1631void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1632
1633#else
1634
1635static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1636{
1637 return 0;
1638}
1639
1640static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1641 struct ip_vs_conn *cp, int outin)
1642{
1643}
1644
1645static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1646{
1647 return NF_ACCEPT;
1648}
1649
1650static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1651{
1652}
1653#endif /* CONFIG_IP_VS_NFCT */
1654
1655/* Using old conntrack that can not be redirected to another real server? */
1656static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1657 struct sk_buff *skb)
1658{
1659#ifdef CONFIG_IP_VS_NFCT
1660 enum ip_conntrack_info ctinfo;
1661 struct nf_conn *ct;
1662
1663 ct = nf_ct_get(skb, &ctinfo);
1664 if (ct && nf_ct_is_confirmed(ct))
1665 return true;
1666#endif
1667 return false;
1668}
1669
1670static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1671{
1672#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1673 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1674 int ret = 0;
1675
1676 if (!(svc->conntrack_afmask & afmask)) {
1677 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1678 if (ret >= 0)
1679 svc->conntrack_afmask |= afmask;
1680 }
1681 return ret;
1682#else
1683 return 0;
1684#endif
1685}
1686
1687static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1688{
1689#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1690 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1691
1692 if (svc->conntrack_afmask & afmask) {
1693 nf_ct_netns_put(svc->ipvs->net, svc->af);
1694 svc->conntrack_afmask &= ~afmask;
1695 }
1696#endif
1697}
1698
1699int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1700void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1701
1702static inline int
1703ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1704{
1705 /* We think the overhead of processing active connections is 256
1706 * times higher than that of inactive connections in average. (This
1707 * 256 times might not be accurate, we will change it later) We
1708 * use the following formula to estimate the overhead now:
1709 * dest->activeconns*256 + dest->inactconns
1710 */
1711 return (atomic_read(&dest->activeconns) << 8) +
1712 atomic_read(&dest->inactconns);
1713}
1714
1715#ifdef CONFIG_IP_VS_PROTO_TCP
1716INDIRECT_CALLABLE_DECLARE(int
1717 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1718 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1719#endif
1720
1721#ifdef CONFIG_IP_VS_PROTO_UDP
1722INDIRECT_CALLABLE_DECLARE(int
1723 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1724 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1725#endif
1726#endif /* _NET_IP_VS_H */