3 * data structure and functionality definitions
9 #include <linux/ip_vs.h> /* definitions shared with userland */
11 /* old ipvsadm versions still include this file directly */
14 #include <asm/types.h> /* for __uXX types */
16 #include <linux/sysctl.h> /* for ctl_path */
17 #include <linux/list.h> /* for struct list_head */
18 #include <linux/spinlock.h> /* for struct rwlock_t */
19 #include <asm/atomic.h> /* for struct atomic_t */
20 #include <linux/compiler.h>
21 #include <linux/timer.h>
23 #include <net/checksum.h>
24 #include <linux/netfilter.h> /* for union nf_inet_addr */
26 #include <linux/ipv6.h> /* for struct ipv6hdr */
27 #include <net/ipv6.h> /* for ipv6_addr_copy */
28 #ifdef CONFIG_IP_VS_NFCT
29 #include <net/netfilter/nf_conntrack.h>
32 /* Connections' size value needed by ip_vs_ctl.c */
33 extern int ip_vs_conn_tab_size;
39 union nf_inet_addr saddr;
40 union nf_inet_addr daddr;
44 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
46 #ifdef CONFIG_IP_VS_IPV6
48 const struct ipv6hdr *iph = nh;
49 iphdr->len = sizeof(struct ipv6hdr);
50 iphdr->protocol = iph->nexthdr;
51 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
52 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
56 const struct iphdr *iph = nh;
57 iphdr->len = iph->ihl * 4;
58 iphdr->protocol = iph->protocol;
59 iphdr->saddr.ip = iph->saddr;
60 iphdr->daddr.ip = iph->daddr;
64 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
65 const union nf_inet_addr *src)
67 #ifdef CONFIG_IP_VS_IPV6
69 ipv6_addr_copy(&dst->in6, &src->in6);
75 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
76 const union nf_inet_addr *b)
78 #ifdef CONFIG_IP_VS_IPV6
80 return ipv6_addr_equal(&a->in6, &b->in6);
82 return a->ip == b->ip;
85 #ifdef CONFIG_IP_VS_DEBUG
86 #include <linux/net.h>
88 extern int ip_vs_get_debug_level(void);
90 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
91 const union nf_inet_addr *addr,
95 #ifdef CONFIG_IP_VS_IPV6
97 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
101 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
105 BUG_ON(*idx > buf_len + 1);
106 return &buf[*idx - len];
109 #define IP_VS_DBG_BUF(level, msg, ...) \
111 char ip_vs_dbg_buf[160]; \
112 int ip_vs_dbg_idx = 0; \
113 if (level <= ip_vs_get_debug_level()) \
114 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
116 #define IP_VS_ERR_BUF(msg...) \
118 char ip_vs_dbg_buf[160]; \
119 int ip_vs_dbg_idx = 0; \
123 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
124 #define IP_VS_DBG_ADDR(af, addr) \
125 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
126 sizeof(ip_vs_dbg_buf), addr, \
129 #define IP_VS_DBG(level, msg, ...) \
131 if (level <= ip_vs_get_debug_level()) \
132 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
134 #define IP_VS_DBG_RL(msg, ...) \
136 if (net_ratelimit()) \
137 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
139 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
141 if (level <= ip_vs_get_debug_level()) \
142 pp->debug_packet(pp, skb, ofs, msg); \
144 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
146 if (level <= ip_vs_get_debug_level() && \
148 pp->debug_packet(pp, skb, ofs, msg); \
150 #else /* NO DEBUGGING at ALL */
151 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
152 #define IP_VS_ERR_BUF(msg...) do {} while (0)
153 #define IP_VS_DBG(level, msg...) do {} while (0)
154 #define IP_VS_DBG_RL(msg...) do {} while (0)
155 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0)
156 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0)
159 #define IP_VS_BUG() BUG()
160 #define IP_VS_ERR_RL(msg, ...) \
162 if (net_ratelimit()) \
163 pr_err(msg, ##__VA_ARGS__); \
166 #ifdef CONFIG_IP_VS_DEBUG
167 #define EnterFunction(level) \
169 if (level <= ip_vs_get_debug_level()) \
171 pr_fmt("Enter: %s, %s line %i\n"), \
172 __func__, __FILE__, __LINE__); \
174 #define LeaveFunction(level) \
176 if (level <= ip_vs_get_debug_level()) \
178 pr_fmt("Leave: %s, %s line %i\n"), \
179 __func__, __FILE__, __LINE__); \
182 #define EnterFunction(level) do {} while (0)
183 #define LeaveFunction(level) do {} while (0)
186 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
190 * The port number of FTP service (in network order).
192 #define FTPPORT cpu_to_be16(21)
193 #define FTPDATA cpu_to_be16(20)
199 IP_VS_TCP_S_NONE = 0,
200 IP_VS_TCP_S_ESTABLISHED,
201 IP_VS_TCP_S_SYN_SENT,
202 IP_VS_TCP_S_SYN_RECV,
203 IP_VS_TCP_S_FIN_WAIT,
204 IP_VS_TCP_S_TIME_WAIT,
206 IP_VS_TCP_S_CLOSE_WAIT,
207 IP_VS_TCP_S_LAST_ACK,
232 enum ip_vs_sctp_states {
234 IP_VS_SCTP_S_INIT_CLI,
235 IP_VS_SCTP_S_INIT_SER,
236 IP_VS_SCTP_S_INIT_ACK_CLI,
237 IP_VS_SCTP_S_INIT_ACK_SER,
238 IP_VS_SCTP_S_ECHO_CLI,
239 IP_VS_SCTP_S_ECHO_SER,
240 IP_VS_SCTP_S_ESTABLISHED,
241 IP_VS_SCTP_S_SHUT_CLI,
242 IP_VS_SCTP_S_SHUT_SER,
243 IP_VS_SCTP_S_SHUT_ACK_CLI,
244 IP_VS_SCTP_S_SHUT_ACK_SER,
250 * Delta sequence info structure
251 * Each ip_vs_conn has 2 (output AND input seq. changes).
252 * Only used in the VS/NAT.
255 __u32 init_seq; /* Add delta from this seq */
256 __u32 delta; /* Delta in sequence numbers */
257 __u32 previous_delta; /* Delta in sequence numbers
258 before last resized pkt */
263 * IPVS statistics objects
265 struct ip_vs_estimator {
266 struct list_head list;
282 struct ip_vs_stats_user ustats; /* statistics */
283 struct ip_vs_estimator est; /* estimator */
285 spinlock_t lock; /* spin lock */
294 struct ip_vs_protocol {
295 struct ip_vs_protocol *next;
300 atomic_t appcnt; /* counter of proto app incs */
301 int *timeout_table; /* protocol timeout table */
303 void (*init)(struct ip_vs_protocol *pp);
305 void (*exit)(struct ip_vs_protocol *pp);
307 int (*conn_schedule)(int af, struct sk_buff *skb,
308 struct ip_vs_protocol *pp,
309 int *verdict, struct ip_vs_conn **cpp);
312 (*conn_in_get)(int af,
313 const struct sk_buff *skb,
314 struct ip_vs_protocol *pp,
315 const struct ip_vs_iphdr *iph,
316 unsigned int proto_off,
320 (*conn_out_get)(int af,
321 const struct sk_buff *skb,
322 struct ip_vs_protocol *pp,
323 const struct ip_vs_iphdr *iph,
324 unsigned int proto_off,
327 int (*snat_handler)(struct sk_buff *skb,
328 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
330 int (*dnat_handler)(struct sk_buff *skb,
331 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
333 int (*csum_check)(int af, struct sk_buff *skb,
334 struct ip_vs_protocol *pp);
336 const char *(*state_name)(int state);
338 int (*state_transition)(struct ip_vs_conn *cp, int direction,
339 const struct sk_buff *skb,
340 struct ip_vs_protocol *pp);
342 int (*register_app)(struct ip_vs_app *inc);
344 void (*unregister_app)(struct ip_vs_app *inc);
346 int (*app_conn_bind)(struct ip_vs_conn *cp);
348 void (*debug_packet)(struct ip_vs_protocol *pp,
349 const struct sk_buff *skb,
353 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
355 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
358 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
360 struct ip_vs_conn_param {
361 const union nf_inet_addr *caddr;
362 const union nf_inet_addr *vaddr;
368 const struct ip_vs_pe *pe;
374 * IP_VS structure allocated for each dynamically scheduled connection
377 struct list_head c_list; /* hashed list heads */
379 /* Protocol, addresses and port numbers */
380 u16 af; /* address family */
381 union nf_inet_addr caddr; /* client address */
382 union nf_inet_addr vaddr; /* virtual address */
383 union nf_inet_addr daddr; /* destination address */
384 volatile __u32 flags; /* status flags */
388 __u16 protocol; /* Which protocol (TCP/UDP) */
390 /* counter and timer */
391 atomic_t refcnt; /* reference count */
392 struct timer_list timer; /* Expiration timer */
393 volatile unsigned long timeout; /* timeout */
395 /* Flags and state transition */
396 spinlock_t lock; /* lock for state transition */
397 volatile __u16 state; /* state info */
398 volatile __u16 old_state; /* old state, to be used for
399 * state transition triggerd
403 /* Control members */
404 struct ip_vs_conn *control; /* Master control connection */
405 atomic_t n_control; /* Number of controlled ones */
406 struct ip_vs_dest *dest; /* real server */
407 atomic_t in_pkts; /* incoming packet counter */
409 /* packet transmitter for different forwarding methods. If it
410 mangles the packet, it must return NF_DROP or better NF_STOLEN,
411 otherwise this must be changed to a sk_buff **.
413 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
414 struct ip_vs_protocol *pp);
416 /* Note: we can group the following members into a structure,
417 in order to save more space, and the following members are
418 only used in VS/NAT anyway */
419 struct ip_vs_app *app; /* bound ip_vs_app object */
420 void *app_data; /* Application private data */
421 struct ip_vs_seq in_seq; /* incoming seq. struct */
422 struct ip_vs_seq out_seq; /* outgoing seq. struct */
430 * Extended internal versions of struct ip_vs_service_user and
431 * ip_vs_dest_user for IPv6 support.
433 * We need these to conveniently pass around service and destination
434 * options, but unfortunately, we also need to keep the old definitions to
435 * maintain userspace backwards compatibility for the setsockopt interface.
437 struct ip_vs_service_user_kern {
438 /* virtual service addresses */
441 union nf_inet_addr addr; /* virtual ip address */
443 u32 fwmark; /* firwall mark of service */
445 /* virtual service options */
448 unsigned flags; /* virtual service flags */
449 unsigned timeout; /* persistent timeout in sec */
450 u32 netmask; /* persistent netmask */
454 struct ip_vs_dest_user_kern {
455 /* destination server address */
456 union nf_inet_addr addr;
459 /* real server options */
460 unsigned conn_flags; /* connection flags */
461 int weight; /* destination weight */
463 /* thresholds for active connections */
464 u32 u_threshold; /* upper threshold */
465 u32 l_threshold; /* lower threshold */
470 * The information about the virtual service offered to the net
471 * and the forwarding entries
473 struct ip_vs_service {
474 struct list_head s_list; /* for normal service table */
475 struct list_head f_list; /* for fwmark-based service table */
476 atomic_t refcnt; /* reference counter */
477 atomic_t usecnt; /* use counter */
479 u16 af; /* address family */
480 __u16 protocol; /* which protocol (TCP/UDP) */
481 union nf_inet_addr addr; /* IP address for virtual service */
482 __be16 port; /* port number for the service */
483 __u32 fwmark; /* firewall mark of the service */
484 unsigned flags; /* service status flags */
485 unsigned timeout; /* persistent timeout in ticks */
486 __be32 netmask; /* grouping granularity */
488 struct list_head destinations; /* real server d-linked list */
489 __u32 num_dests; /* number of servers */
490 struct ip_vs_stats stats; /* statistics for the service */
491 struct ip_vs_app *inc; /* bind conns to this app inc */
494 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
495 rwlock_t sched_lock; /* lock sched_data */
496 void *sched_data; /* scheduler application data */
498 /* alternate persistence engine */
504 * The real server destination forwarding entry
505 * with ip address, port number, and so on.
508 struct list_head n_list; /* for the dests in the service */
509 struct list_head d_list; /* for table with all the dests */
511 u16 af; /* address family */
512 union nf_inet_addr addr; /* IP address of the server */
513 __be16 port; /* port number of the server */
514 volatile unsigned flags; /* dest status flags */
515 atomic_t conn_flags; /* flags to copy to conn */
516 atomic_t weight; /* server weight */
518 atomic_t refcnt; /* reference counter */
519 struct ip_vs_stats stats; /* statistics */
521 /* connection counters and thresholds */
522 atomic_t activeconns; /* active connections */
523 atomic_t inactconns; /* inactive connections */
524 atomic_t persistconns; /* persistent connections */
525 __u32 u_threshold; /* upper threshold */
526 __u32 l_threshold; /* lower threshold */
528 /* for destination cache */
529 spinlock_t dst_lock; /* lock of dst_cache */
530 struct dst_entry *dst_cache; /* destination cache entry */
531 u32 dst_rtos; /* RT_TOS(tos) for dst */
533 /* for virtual service */
534 struct ip_vs_service *svc; /* service it belongs to */
535 __u16 protocol; /* which protocol (TCP/UDP) */
536 union nf_inet_addr vaddr; /* virtual IP address */
537 __be16 vport; /* virtual port number */
538 __u32 vfwmark; /* firewall mark of service */
543 * The scheduler object
545 struct ip_vs_scheduler {
546 struct list_head n_list; /* d-linked list head */
547 char *name; /* scheduler name */
548 atomic_t refcnt; /* reference counter */
549 struct module *module; /* THIS_MODULE/NULL */
551 /* scheduler initializing service */
552 int (*init_service)(struct ip_vs_service *svc);
553 /* scheduling service finish */
554 int (*done_service)(struct ip_vs_service *svc);
555 /* scheduler updating service */
556 int (*update_service)(struct ip_vs_service *svc);
558 /* selecting a server from the given service */
559 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
560 const struct sk_buff *skb);
563 /* The persistence engine object */
565 struct list_head n_list; /* d-linked list head */
566 char *name; /* scheduler name */
567 atomic_t refcnt; /* reference counter */
568 struct module *module; /* THIS_MODULE/NULL */
570 /* get the connection template, if any */
571 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
572 bool (*ct_match)(const struct ip_vs_conn_param *p,
573 struct ip_vs_conn *ct);
574 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
576 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
580 * The application module object (a.k.a. app incarnation)
583 struct list_head a_list; /* member in app list */
584 int type; /* IP_VS_APP_TYPE_xxx */
585 char *name; /* application module name */
587 struct module *module; /* THIS_MODULE/NULL */
588 struct list_head incs_list; /* list of incarnations */
590 /* members for application incarnations */
591 struct list_head p_list; /* member in proto app list */
592 struct ip_vs_app *app; /* its real application */
593 __be16 port; /* port number in net order */
594 atomic_t usecnt; /* usage counter */
596 /* output hook: return false if can't linearize. diff set for TCP. */
597 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
598 struct sk_buff *, int *diff);
600 /* input hook: return false if can't linearize. diff set for TCP. */
601 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
602 struct sk_buff *, int *diff);
604 /* ip_vs_app initializer */
605 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
607 /* ip_vs_app finish */
608 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
612 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
613 struct ip_vs_protocol *);
615 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
621 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
622 int *verdict, struct ip_vs_conn **cpp);
625 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
626 const struct iphdr *iph, unsigned int proto_off,
630 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
631 const struct iphdr *iph, unsigned int proto_off,
634 int (*state_transition)(struct ip_vs_conn *cp, int direction,
635 const struct sk_buff *skb,
636 struct ip_vs_app *app);
638 void (*timeout_change)(struct ip_vs_app *app, int flags);
643 * IPVS core functions
644 * (from ip_vs_core.c)
646 extern const char *ip_vs_proto_name(unsigned proto);
647 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
648 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
650 #define IP_VS_APP_TYPE_FTP 1
653 * ip_vs_conn handling functions
654 * (from ip_vs_conn.c)
660 IP_VS_DIR_INPUT_ONLY,
664 static inline void ip_vs_conn_fill_param(int af, int protocol,
665 const union nf_inet_addr *caddr,
667 const union nf_inet_addr *vaddr,
669 struct ip_vs_conn_param *p)
672 p->protocol = protocol;
681 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
682 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
684 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
685 struct ip_vs_protocol *pp,
686 const struct ip_vs_iphdr *iph,
687 unsigned int proto_off,
690 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
692 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
693 struct ip_vs_protocol *pp,
694 const struct ip_vs_iphdr *iph,
695 unsigned int proto_off,
698 /* put back the conn without restarting its timer */
699 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
701 atomic_dec(&cp->refcnt);
703 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
704 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
706 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
707 const union nf_inet_addr *daddr,
708 __be16 dport, unsigned flags,
709 struct ip_vs_dest *dest);
710 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
712 extern const char * ip_vs_state_name(__u16 proto, int state);
714 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
715 extern int ip_vs_check_template(struct ip_vs_conn *ct);
716 extern void ip_vs_random_dropentry(void);
717 extern int ip_vs_conn_init(void);
718 extern void ip_vs_conn_cleanup(void);
720 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
722 struct ip_vs_conn *ctl_cp = cp->control;
724 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
726 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
728 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
734 IP_VS_DBG_BUF(7, "DELeting control for: "
735 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
736 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
738 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
739 ntohs(ctl_cp->cport));
742 if (atomic_read(&ctl_cp->n_control) == 0) {
743 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
745 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
747 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
752 atomic_dec(&ctl_cp->n_control);
756 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
759 IP_VS_ERR_BUF("request control ADD for already controlled: "
761 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
763 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
766 ip_vs_control_del(cp);
769 IP_VS_DBG_BUF(7, "ADDing control for: "
770 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
771 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
773 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
774 ntohs(ctl_cp->cport));
776 cp->control = ctl_cp;
777 atomic_inc(&ctl_cp->n_control);
782 * IPVS application functions
785 #define IP_VS_APP_MAX_PORTS 8
786 extern int register_ip_vs_app(struct ip_vs_app *app);
787 extern void unregister_ip_vs_app(struct ip_vs_app *app);
788 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
789 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
791 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
792 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
793 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
795 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
796 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
797 extern int ip_vs_app_init(void);
798 extern void ip_vs_app_cleanup(void);
800 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
801 void ip_vs_unbind_pe(struct ip_vs_service *svc);
802 int register_ip_vs_pe(struct ip_vs_pe *pe);
803 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
804 extern struct ip_vs_pe *ip_vs_pe_get(const char *name);
805 extern void ip_vs_pe_put(struct ip_vs_pe *pe);
808 * IPVS protocol functions (from ip_vs_proto.c)
810 extern int ip_vs_protocol_init(void);
811 extern void ip_vs_protocol_cleanup(void);
812 extern void ip_vs_protocol_timeout_change(int flags);
813 extern int *ip_vs_create_timeout_table(int *table, int size);
815 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
816 const char *name, int to);
818 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
819 int offset, const char *msg);
821 extern struct ip_vs_protocol ip_vs_protocol_tcp;
822 extern struct ip_vs_protocol ip_vs_protocol_udp;
823 extern struct ip_vs_protocol ip_vs_protocol_icmp;
824 extern struct ip_vs_protocol ip_vs_protocol_esp;
825 extern struct ip_vs_protocol ip_vs_protocol_ah;
826 extern struct ip_vs_protocol ip_vs_protocol_sctp;
829 * Registering/unregistering scheduler functions
830 * (from ip_vs_sched.c)
832 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
833 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
834 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
835 struct ip_vs_scheduler *scheduler);
836 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
837 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
838 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
839 extern struct ip_vs_conn *
840 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb);
841 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
842 struct ip_vs_protocol *pp);
846 * IPVS control data and functions (from ip_vs_ctl.c)
848 extern int sysctl_ip_vs_cache_bypass;
849 extern int sysctl_ip_vs_expire_nodest_conn;
850 extern int sysctl_ip_vs_expire_quiescent_template;
851 extern int sysctl_ip_vs_sync_threshold[2];
852 extern int sysctl_ip_vs_nat_icmp_send;
853 extern int sysctl_ip_vs_conntrack;
854 extern int sysctl_ip_vs_snat_reroute;
855 extern struct ip_vs_stats ip_vs_stats;
856 extern const struct ctl_path net_vs_ctl_path[];
858 extern struct ip_vs_service *
859 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
860 const union nf_inet_addr *vaddr, __be16 vport);
862 static inline void ip_vs_service_put(struct ip_vs_service *svc)
864 atomic_dec(&svc->usecnt);
867 extern struct ip_vs_dest *
868 ip_vs_lookup_real_service(int af, __u16 protocol,
869 const union nf_inet_addr *daddr, __be16 dport);
871 extern int ip_vs_use_count_inc(void);
872 extern void ip_vs_use_count_dec(void);
873 extern int ip_vs_control_init(void);
874 extern void ip_vs_control_cleanup(void);
875 extern struct ip_vs_dest *
876 ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
877 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
878 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
882 * IPVS sync daemon data and function prototypes
883 * (from ip_vs_sync.c)
885 extern volatile int ip_vs_sync_state;
886 extern volatile int ip_vs_master_syncid;
887 extern volatile int ip_vs_backup_syncid;
888 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
889 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
890 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
891 extern int stop_sync_thread(int state);
892 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
896 * IPVS rate estimator prototypes (from ip_vs_est.c)
898 extern int ip_vs_estimator_init(void);
899 extern void ip_vs_estimator_cleanup(void);
900 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
901 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
902 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
905 * Various IPVS packet transmitters (from ip_vs_xmit.c)
907 extern int ip_vs_null_xmit
908 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
909 extern int ip_vs_bypass_xmit
910 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
911 extern int ip_vs_nat_xmit
912 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
913 extern int ip_vs_tunnel_xmit
914 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
915 extern int ip_vs_dr_xmit
916 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
917 extern int ip_vs_icmp_xmit
918 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
919 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
921 #ifdef CONFIG_IP_VS_IPV6
922 extern int ip_vs_bypass_xmit_v6
923 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
924 extern int ip_vs_nat_xmit_v6
925 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
926 extern int ip_vs_tunnel_xmit_v6
927 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
928 extern int ip_vs_dr_xmit_v6
929 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
930 extern int ip_vs_icmp_xmit_v6
931 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
936 * This is a simple mechanism to ignore packets when
937 * we are loaded. Just set ip_vs_drop_rate to 'n' and
938 * we start to drop 1/rate of the packets
940 extern int ip_vs_drop_rate;
941 extern int ip_vs_drop_counter;
943 static __inline__ int ip_vs_todrop(void)
945 if (!ip_vs_drop_rate) return 0;
946 if (--ip_vs_drop_counter > 0) return 0;
947 ip_vs_drop_counter = ip_vs_drop_rate;
952 * ip_vs_fwd_tag returns the forwarding tag of the connection
954 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
956 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
960 switch (IP_VS_FWD_METHOD(cp)) {
961 case IP_VS_CONN_F_MASQ:
963 case IP_VS_CONN_F_LOCALNODE:
965 case IP_VS_CONN_F_TUNNEL:
967 case IP_VS_CONN_F_DROUTE:
969 case IP_VS_CONN_F_BYPASS:
977 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
978 struct ip_vs_conn *cp, int dir);
980 #ifdef CONFIG_IP_VS_IPV6
981 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
982 struct ip_vs_conn *cp, int dir);
985 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
987 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
989 __be32 diff[2] = { ~old, new };
991 return csum_partial(diff, sizeof(diff), oldsum);
994 #ifdef CONFIG_IP_VS_IPV6
995 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
998 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
999 new[3], new[2], new[1], new[0] };
1001 return csum_partial(diff, sizeof(diff), oldsum);
1005 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1007 __be16 diff[2] = { ~old, new };
1009 return csum_partial(diff, sizeof(diff), oldsum);
1012 #ifdef CONFIG_IP_VS_NFCT
1014 * Netfilter connection tracking
1015 * (from ip_vs_nfct.c)
1017 static inline int ip_vs_conntrack_enabled(void)
1019 return sysctl_ip_vs_conntrack;
1022 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1024 extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1025 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1026 struct ip_vs_conn *cp, u_int8_t proto,
1027 const __be16 port, int from_rs);
1028 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1032 static inline int ip_vs_conntrack_enabled(void)
1037 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1038 struct ip_vs_conn *cp, int outin)
1042 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1043 struct ip_vs_conn *cp)
1048 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1051 /* CONFIG_IP_VS_NFCT */
1054 #endif /* __KERNEL__ */
1056 #endif /* _NET_IP_VS_H */