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>
25 #ifdef CONFIG_IP_VS_DEBUG
26 #include <linux/net.h>
28 extern int ip_vs_get_debug_level(void);
29 #define IP_VS_DBG(level, msg...) \
31 if (level <= ip_vs_get_debug_level()) \
32 printk(KERN_DEBUG "IPVS: " msg); \
34 #define IP_VS_DBG_RL(msg...) \
36 if (net_ratelimit()) \
37 printk(KERN_DEBUG "IPVS: " msg); \
39 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
41 if (level <= ip_vs_get_debug_level()) \
42 pp->debug_packet(pp, skb, ofs, msg); \
44 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
46 if (level <= ip_vs_get_debug_level() && \
48 pp->debug_packet(pp, skb, ofs, msg); \
50 #else /* NO DEBUGGING at ALL */
51 #define IP_VS_DBG(level, msg...) do {} while (0)
52 #define IP_VS_DBG_RL(msg...) do {} while (0)
53 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0)
54 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0)
57 #define IP_VS_BUG() BUG()
58 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
59 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
60 #define IP_VS_WARNING(msg...) \
61 printk(KERN_WARNING "IPVS: " msg)
62 #define IP_VS_ERR_RL(msg...) \
64 if (net_ratelimit()) \
65 printk(KERN_ERR "IPVS: " msg); \
68 #ifdef CONFIG_IP_VS_DEBUG
69 #define EnterFunction(level) \
71 if (level <= ip_vs_get_debug_level()) \
72 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \
73 __FUNCTION__, __FILE__, __LINE__); \
75 #define LeaveFunction(level) \
77 if (level <= ip_vs_get_debug_level()) \
78 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \
79 __FUNCTION__, __FILE__, __LINE__); \
82 #define EnterFunction(level) do {} while (0)
83 #define LeaveFunction(level) do {} while (0)
86 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
90 * The port number of FTP service (in network order).
92 #define FTPPORT __constant_htons(21)
93 #define FTPDATA __constant_htons(20)
100 IP_VS_TCP_S_ESTABLISHED
,
101 IP_VS_TCP_S_SYN_SENT
,
102 IP_VS_TCP_S_SYN_RECV
,
103 IP_VS_TCP_S_FIN_WAIT
,
104 IP_VS_TCP_S_TIME_WAIT
,
106 IP_VS_TCP_S_CLOSE_WAIT
,
107 IP_VS_TCP_S_LAST_ACK
,
130 * Delta sequence info structure
131 * Each ip_vs_conn has 2 (output AND input seq. changes).
132 * Only used in the VS/NAT.
135 __u32 init_seq
; /* Add delta from this seq */
136 __u32 delta
; /* Delta in sequence numbers */
137 __u32 previous_delta
; /* Delta in sequence numbers
138 before last resized pkt */
143 * IPVS statistics objects
145 struct ip_vs_estimator
{
146 struct list_head list
;
163 __u32 conns
; /* connections scheduled */
164 __u32 inpkts
; /* incoming packets */
165 __u32 outpkts
; /* outgoing packets */
166 __u64 inbytes
; /* incoming bytes */
167 __u64 outbytes
; /* outgoing bytes */
169 __u32 cps
; /* current connection rate */
170 __u32 inpps
; /* current in packet rate */
171 __u32 outpps
; /* current out packet rate */
172 __u32 inbps
; /* current in byte rate */
173 __u32 outbps
; /* current out byte rate */
176 * Don't add anything before the lock, because we use memcpy() to copy
177 * the members before the lock to struct ip_vs_stats_user in
181 spinlock_t lock
; /* spin lock */
183 struct ip_vs_estimator est
; /* estimator */
192 struct ip_vs_protocol
{
193 struct ip_vs_protocol
*next
;
198 atomic_t appcnt
; /* counter of proto app incs */
199 int *timeout_table
; /* protocol timeout table */
201 void (*init
)(struct ip_vs_protocol
*pp
);
203 void (*exit
)(struct ip_vs_protocol
*pp
);
205 int (*conn_schedule
)(struct sk_buff
*skb
,
206 struct ip_vs_protocol
*pp
,
207 int *verdict
, struct ip_vs_conn
**cpp
);
210 (*conn_in_get
)(const struct sk_buff
*skb
,
211 struct ip_vs_protocol
*pp
,
212 const struct iphdr
*iph
,
213 unsigned int proto_off
,
217 (*conn_out_get
)(const struct sk_buff
*skb
,
218 struct ip_vs_protocol
*pp
,
219 const struct iphdr
*iph
,
220 unsigned int proto_off
,
223 int (*snat_handler
)(struct sk_buff
*skb
,
224 struct ip_vs_protocol
*pp
, struct ip_vs_conn
*cp
);
226 int (*dnat_handler
)(struct sk_buff
*skb
,
227 struct ip_vs_protocol
*pp
, struct ip_vs_conn
*cp
);
229 int (*csum_check
)(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
);
231 const char *(*state_name
)(int state
);
233 int (*state_transition
)(struct ip_vs_conn
*cp
, int direction
,
234 const struct sk_buff
*skb
,
235 struct ip_vs_protocol
*pp
);
237 int (*register_app
)(struct ip_vs_app
*inc
);
239 void (*unregister_app
)(struct ip_vs_app
*inc
);
241 int (*app_conn_bind
)(struct ip_vs_conn
*cp
);
243 void (*debug_packet
)(struct ip_vs_protocol
*pp
,
244 const struct sk_buff
*skb
,
248 void (*timeout_change
)(struct ip_vs_protocol
*pp
, int flags
);
250 int (*set_state_timeout
)(struct ip_vs_protocol
*pp
, char *sname
, int to
);
253 extern struct ip_vs_protocol
* ip_vs_proto_get(unsigned short proto
);
256 * IP_VS structure allocated for each dynamically scheduled connection
259 struct list_head c_list
; /* hashed list heads */
261 /* Protocol, addresses and port numbers */
262 __be32 caddr
; /* client address */
263 __be32 vaddr
; /* virtual address */
264 __be32 daddr
; /* destination address */
268 __u16 protocol
; /* Which protocol (TCP/UDP) */
270 /* counter and timer */
271 atomic_t refcnt
; /* reference count */
272 struct timer_list timer
; /* Expiration timer */
273 volatile unsigned long timeout
; /* timeout */
275 /* Flags and state transition */
276 spinlock_t lock
; /* lock for state transition */
277 volatile __u16 flags
; /* status flags */
278 volatile __u16 state
; /* state info */
279 volatile __u16 old_state
; /* old state, to be used for
280 * state transition triggerd
284 /* Control members */
285 struct ip_vs_conn
*control
; /* Master control connection */
286 atomic_t n_control
; /* Number of controlled ones */
287 struct ip_vs_dest
*dest
; /* real server */
288 atomic_t in_pkts
; /* incoming packet counter */
290 /* packet transmitter for different forwarding methods. If it
291 mangles the packet, it must return NF_DROP or better NF_STOLEN,
292 otherwise this must be changed to a sk_buff **.
294 int (*packet_xmit
)(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
295 struct ip_vs_protocol
*pp
);
297 /* Note: we can group the following members into a structure,
298 in order to save more space, and the following members are
299 only used in VS/NAT anyway */
300 struct ip_vs_app
*app
; /* bound ip_vs_app object */
301 void *app_data
; /* Application private data */
302 struct ip_vs_seq in_seq
; /* incoming seq. struct */
303 struct ip_vs_seq out_seq
; /* outgoing seq. struct */
308 * The information about the virtual service offered to the net
309 * and the forwarding entries
311 struct ip_vs_service
{
312 struct list_head s_list
; /* for normal service table */
313 struct list_head f_list
; /* for fwmark-based service table */
314 atomic_t refcnt
; /* reference counter */
315 atomic_t usecnt
; /* use counter */
317 __u16 protocol
; /* which protocol (TCP/UDP) */
318 __be32 addr
; /* IP address for virtual service */
319 __be16 port
; /* port number for the service */
320 __u32 fwmark
; /* firewall mark of the service */
321 unsigned flags
; /* service status flags */
322 unsigned timeout
; /* persistent timeout in ticks */
323 __be32 netmask
; /* grouping granularity */
325 struct list_head destinations
; /* real server d-linked list */
326 __u32 num_dests
; /* number of servers */
327 struct ip_vs_stats stats
; /* statistics for the service */
328 struct ip_vs_app
*inc
; /* bind conns to this app inc */
331 struct ip_vs_scheduler
*scheduler
; /* bound scheduler object */
332 rwlock_t sched_lock
; /* lock sched_data */
333 void *sched_data
; /* scheduler application data */
338 * The real server destination forwarding entry
339 * with ip address, port number, and so on.
342 struct list_head n_list
; /* for the dests in the service */
343 struct list_head d_list
; /* for table with all the dests */
345 __be32 addr
; /* IP address of the server */
346 __be16 port
; /* port number of the server */
347 volatile unsigned flags
; /* dest status flags */
348 atomic_t conn_flags
; /* flags to copy to conn */
349 atomic_t weight
; /* server weight */
351 atomic_t refcnt
; /* reference counter */
352 struct ip_vs_stats stats
; /* statistics */
354 /* connection counters and thresholds */
355 atomic_t activeconns
; /* active connections */
356 atomic_t inactconns
; /* inactive connections */
357 atomic_t persistconns
; /* persistent connections */
358 __u32 u_threshold
; /* upper threshold */
359 __u32 l_threshold
; /* lower threshold */
361 /* for destination cache */
362 spinlock_t dst_lock
; /* lock of dst_cache */
363 struct dst_entry
*dst_cache
; /* destination cache entry */
364 u32 dst_rtos
; /* RT_TOS(tos) for dst */
366 /* for virtual service */
367 struct ip_vs_service
*svc
; /* service it belongs to */
368 __u16 protocol
; /* which protocol (TCP/UDP) */
369 __be32 vaddr
; /* virtual IP address */
370 __be16 vport
; /* virtual port number */
371 __u32 vfwmark
; /* firewall mark of service */
376 * The scheduler object
378 struct ip_vs_scheduler
{
379 struct list_head n_list
; /* d-linked list head */
380 char *name
; /* scheduler name */
381 atomic_t refcnt
; /* reference counter */
382 struct module
*module
; /* THIS_MODULE/NULL */
384 /* scheduler initializing service */
385 int (*init_service
)(struct ip_vs_service
*svc
);
386 /* scheduling service finish */
387 int (*done_service
)(struct ip_vs_service
*svc
);
388 /* scheduler updating service */
389 int (*update_service
)(struct ip_vs_service
*svc
);
391 /* selecting a server from the given service */
392 struct ip_vs_dest
* (*schedule
)(struct ip_vs_service
*svc
,
393 const struct sk_buff
*skb
);
398 * The application module object (a.k.a. app incarnation)
402 struct list_head a_list
; /* member in app list */
403 int type
; /* IP_VS_APP_TYPE_xxx */
404 char *name
; /* application module name */
406 struct module
*module
; /* THIS_MODULE/NULL */
407 struct list_head incs_list
; /* list of incarnations */
409 /* members for application incarnations */
410 struct list_head p_list
; /* member in proto app list */
411 struct ip_vs_app
*app
; /* its real application */
412 __be16 port
; /* port number in net order */
413 atomic_t usecnt
; /* usage counter */
415 /* output hook: return false if can't linearize. diff set for TCP. */
416 int (*pkt_out
)(struct ip_vs_app
*, struct ip_vs_conn
*,
417 struct sk_buff
*, int *diff
);
419 /* input hook: return false if can't linearize. diff set for TCP. */
420 int (*pkt_in
)(struct ip_vs_app
*, struct ip_vs_conn
*,
421 struct sk_buff
*, int *diff
);
423 /* ip_vs_app initializer */
424 int (*init_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*);
426 /* ip_vs_app finish */
427 int (*done_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*);
431 int (*bind_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*,
432 struct ip_vs_protocol
*);
434 void (*unbind_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*);
440 int (*conn_schedule
)(struct sk_buff
*skb
, struct ip_vs_app
*app
,
441 int *verdict
, struct ip_vs_conn
**cpp
);
444 (*conn_in_get
)(const struct sk_buff
*skb
, struct ip_vs_app
*app
,
445 const struct iphdr
*iph
, unsigned int proto_off
,
449 (*conn_out_get
)(const struct sk_buff
*skb
, struct ip_vs_app
*app
,
450 const struct iphdr
*iph
, unsigned int proto_off
,
453 int (*state_transition
)(struct ip_vs_conn
*cp
, int direction
,
454 const struct sk_buff
*skb
,
455 struct ip_vs_app
*app
);
457 void (*timeout_change
)(struct ip_vs_app
*app
, int flags
);
462 * IPVS core functions
463 * (from ip_vs_core.c)
465 extern const char *ip_vs_proto_name(unsigned proto
);
466 extern void ip_vs_init_hash_table(struct list_head
*table
, int rows
);
467 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
469 #define IP_VS_APP_TYPE_FTP 1
472 * ip_vs_conn handling functions
473 * (from ip_vs_conn.c)
477 * IPVS connection entry hash table
479 #ifndef CONFIG_IP_VS_TAB_BITS
480 #define CONFIG_IP_VS_TAB_BITS 12
482 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
483 #if CONFIG_IP_VS_TAB_BITS < 8
484 #define IP_VS_CONN_TAB_BITS 8
486 #if CONFIG_IP_VS_TAB_BITS > 20
487 #define IP_VS_CONN_TAB_BITS 20
489 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
490 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
492 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
493 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
498 IP_VS_DIR_INPUT_ONLY
,
502 extern struct ip_vs_conn
*ip_vs_conn_in_get
503 (int protocol
, __be32 s_addr
, __be16 s_port
, __be32 d_addr
, __be16 d_port
);
504 extern struct ip_vs_conn
*ip_vs_ct_in_get
505 (int protocol
, __be32 s_addr
, __be16 s_port
, __be32 d_addr
, __be16 d_port
);
506 extern struct ip_vs_conn
*ip_vs_conn_out_get
507 (int protocol
, __be32 s_addr
, __be16 s_port
, __be32 d_addr
, __be16 d_port
);
509 /* put back the conn without restarting its timer */
510 static inline void __ip_vs_conn_put(struct ip_vs_conn
*cp
)
512 atomic_dec(&cp
->refcnt
);
514 extern void ip_vs_conn_put(struct ip_vs_conn
*cp
);
515 extern void ip_vs_conn_fill_cport(struct ip_vs_conn
*cp
, __be16 cport
);
517 extern struct ip_vs_conn
*
518 ip_vs_conn_new(int proto
, __be32 caddr
, __be16 cport
, __be32 vaddr
, __be16 vport
,
519 __be32 daddr
, __be16 dport
, unsigned flags
,
520 struct ip_vs_dest
*dest
);
521 extern void ip_vs_conn_expire_now(struct ip_vs_conn
*cp
);
523 extern const char * ip_vs_state_name(__u16 proto
, int state
);
525 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn
*cp
);
526 extern int ip_vs_check_template(struct ip_vs_conn
*ct
);
527 extern void ip_vs_random_dropentry(void);
528 extern int ip_vs_conn_init(void);
529 extern void ip_vs_conn_cleanup(void);
531 static inline void ip_vs_control_del(struct ip_vs_conn
*cp
)
533 struct ip_vs_conn
*ctl_cp
= cp
->control
;
535 IP_VS_ERR("request control DEL for uncontrolled: "
536 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
537 NIPQUAD(cp
->caddr
),ntohs(cp
->cport
),
538 NIPQUAD(cp
->vaddr
),ntohs(cp
->vport
));
542 IP_VS_DBG(7, "DELeting control for: "
543 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
544 NIPQUAD(cp
->caddr
),ntohs(cp
->cport
),
545 NIPQUAD(ctl_cp
->caddr
),ntohs(ctl_cp
->cport
));
548 if (atomic_read(&ctl_cp
->n_control
) == 0) {
549 IP_VS_ERR("BUG control DEL with n=0 : "
550 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
551 NIPQUAD(cp
->caddr
),ntohs(cp
->cport
),
552 NIPQUAD(cp
->vaddr
),ntohs(cp
->vport
));
555 atomic_dec(&ctl_cp
->n_control
);
559 ip_vs_control_add(struct ip_vs_conn
*cp
, struct ip_vs_conn
*ctl_cp
)
562 IP_VS_ERR("request control ADD for already controlled: "
563 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
564 NIPQUAD(cp
->caddr
),ntohs(cp
->cport
),
565 NIPQUAD(cp
->vaddr
),ntohs(cp
->vport
));
566 ip_vs_control_del(cp
);
569 IP_VS_DBG(7, "ADDing control for: "
570 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
571 NIPQUAD(cp
->caddr
),ntohs(cp
->cport
),
572 NIPQUAD(ctl_cp
->caddr
),ntohs(ctl_cp
->cport
));
574 cp
->control
= ctl_cp
;
575 atomic_inc(&ctl_cp
->n_control
);
580 * IPVS application functions
583 #define IP_VS_APP_MAX_PORTS 8
584 extern int register_ip_vs_app(struct ip_vs_app
*app
);
585 extern void unregister_ip_vs_app(struct ip_vs_app
*app
);
586 extern int ip_vs_bind_app(struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
);
587 extern void ip_vs_unbind_app(struct ip_vs_conn
*cp
);
589 register_ip_vs_app_inc(struct ip_vs_app
*app
, __u16 proto
, __u16 port
);
590 extern int ip_vs_app_inc_get(struct ip_vs_app
*inc
);
591 extern void ip_vs_app_inc_put(struct ip_vs_app
*inc
);
593 extern int ip_vs_app_pkt_out(struct ip_vs_conn
*, struct sk_buff
*skb
);
594 extern int ip_vs_app_pkt_in(struct ip_vs_conn
*, struct sk_buff
*skb
);
595 extern int ip_vs_skb_replace(struct sk_buff
*skb
, gfp_t pri
,
596 char *o_buf
, int o_len
, char *n_buf
, int n_len
);
597 extern int ip_vs_app_init(void);
598 extern void ip_vs_app_cleanup(void);
602 * IPVS protocol functions (from ip_vs_proto.c)
604 extern int ip_vs_protocol_init(void);
605 extern void ip_vs_protocol_cleanup(void);
606 extern void ip_vs_protocol_timeout_change(int flags
);
607 extern int *ip_vs_create_timeout_table(int *table
, int size
);
609 ip_vs_set_state_timeout(int *table
, int num
, char **names
, char *name
, int to
);
611 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol
*pp
, const struct sk_buff
*skb
,
612 int offset
, const char *msg
);
614 extern struct ip_vs_protocol ip_vs_protocol_tcp
;
615 extern struct ip_vs_protocol ip_vs_protocol_udp
;
616 extern struct ip_vs_protocol ip_vs_protocol_icmp
;
617 extern struct ip_vs_protocol ip_vs_protocol_esp
;
618 extern struct ip_vs_protocol ip_vs_protocol_ah
;
622 * Registering/unregistering scheduler functions
623 * (from ip_vs_sched.c)
625 extern int register_ip_vs_scheduler(struct ip_vs_scheduler
*scheduler
);
626 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler
*scheduler
);
627 extern int ip_vs_bind_scheduler(struct ip_vs_service
*svc
,
628 struct ip_vs_scheduler
*scheduler
);
629 extern int ip_vs_unbind_scheduler(struct ip_vs_service
*svc
);
630 extern struct ip_vs_scheduler
*ip_vs_scheduler_get(const char *sched_name
);
631 extern void ip_vs_scheduler_put(struct ip_vs_scheduler
*scheduler
);
632 extern struct ip_vs_conn
*
633 ip_vs_schedule(struct ip_vs_service
*svc
, const struct sk_buff
*skb
);
634 extern int ip_vs_leave(struct ip_vs_service
*svc
, struct sk_buff
*skb
,
635 struct ip_vs_protocol
*pp
);
639 * IPVS control data and functions (from ip_vs_ctl.c)
641 extern int sysctl_ip_vs_cache_bypass
;
642 extern int sysctl_ip_vs_expire_nodest_conn
;
643 extern int sysctl_ip_vs_expire_quiescent_template
;
644 extern int sysctl_ip_vs_sync_threshold
[2];
645 extern int sysctl_ip_vs_nat_icmp_send
;
646 extern struct ip_vs_stats ip_vs_stats
;
647 extern const struct ctl_path net_vs_ctl_path
[];
649 extern struct ip_vs_service
*
650 ip_vs_service_get(__u32 fwmark
, __u16 protocol
, __be32 vaddr
, __be16 vport
);
652 static inline void ip_vs_service_put(struct ip_vs_service
*svc
)
654 atomic_dec(&svc
->usecnt
);
657 extern struct ip_vs_dest
*
658 ip_vs_lookup_real_service(__u16 protocol
, __be32 daddr
, __be16 dport
);
659 extern int ip_vs_use_count_inc(void);
660 extern void ip_vs_use_count_dec(void);
661 extern int ip_vs_control_init(void);
662 extern void ip_vs_control_cleanup(void);
663 extern struct ip_vs_dest
*
664 ip_vs_find_dest(__be32 daddr
, __be16 dport
,
665 __be32 vaddr
, __be16 vport
, __u16 protocol
);
666 extern struct ip_vs_dest
*ip_vs_try_bind_dest(struct ip_vs_conn
*cp
);
670 * IPVS sync daemon data and function prototypes
671 * (from ip_vs_sync.c)
673 extern volatile int ip_vs_sync_state
;
674 extern volatile int ip_vs_master_syncid
;
675 extern volatile int ip_vs_backup_syncid
;
676 extern char ip_vs_master_mcast_ifn
[IP_VS_IFNAME_MAXLEN
];
677 extern char ip_vs_backup_mcast_ifn
[IP_VS_IFNAME_MAXLEN
];
678 extern int start_sync_thread(int state
, char *mcast_ifn
, __u8 syncid
);
679 extern int stop_sync_thread(int state
);
680 extern void ip_vs_sync_conn(struct ip_vs_conn
*cp
);
684 * IPVS rate estimator prototypes (from ip_vs_est.c)
686 extern int ip_vs_estimator_init(void);
687 extern void ip_vs_estimator_cleanup(void);
688 extern void ip_vs_new_estimator(struct ip_vs_stats
*stats
);
689 extern void ip_vs_kill_estimator(struct ip_vs_stats
*stats
);
690 extern void ip_vs_zero_estimator(struct ip_vs_stats
*stats
);
693 * Various IPVS packet transmitters (from ip_vs_xmit.c)
695 extern int ip_vs_null_xmit
696 (struct sk_buff
*skb
, struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
);
697 extern int ip_vs_bypass_xmit
698 (struct sk_buff
*skb
, struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
);
699 extern int ip_vs_nat_xmit
700 (struct sk_buff
*skb
, struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
);
701 extern int ip_vs_tunnel_xmit
702 (struct sk_buff
*skb
, struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
);
703 extern int ip_vs_dr_xmit
704 (struct sk_buff
*skb
, struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
);
705 extern int ip_vs_icmp_xmit
706 (struct sk_buff
*skb
, struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
, int offset
);
707 extern void ip_vs_dst_reset(struct ip_vs_dest
*dest
);
711 * This is a simple mechanism to ignore packets when
712 * we are loaded. Just set ip_vs_drop_rate to 'n' and
713 * we start to drop 1/rate of the packets
715 extern int ip_vs_drop_rate
;
716 extern int ip_vs_drop_counter
;
718 static __inline__
int ip_vs_todrop(void)
720 if (!ip_vs_drop_rate
) return 0;
721 if (--ip_vs_drop_counter
> 0) return 0;
722 ip_vs_drop_counter
= ip_vs_drop_rate
;
727 * ip_vs_fwd_tag returns the forwarding tag of the connection
729 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
731 static inline char ip_vs_fwd_tag(struct ip_vs_conn
*cp
)
735 switch (IP_VS_FWD_METHOD(cp
)) {
736 case IP_VS_CONN_F_MASQ
:
738 case IP_VS_CONN_F_LOCALNODE
:
740 case IP_VS_CONN_F_TUNNEL
:
742 case IP_VS_CONN_F_DROUTE
:
744 case IP_VS_CONN_F_BYPASS
:
752 extern void ip_vs_nat_icmp(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
753 struct ip_vs_conn
*cp
, int dir
);
755 extern __sum16
ip_vs_checksum_complete(struct sk_buff
*skb
, int offset
);
757 static inline __wsum
ip_vs_check_diff4(__be32 old
, __be32
new, __wsum oldsum
)
759 __be32 diff
[2] = { ~old
, new };
761 return csum_partial((char *) diff
, sizeof(diff
), oldsum
);
764 static inline __wsum
ip_vs_check_diff2(__be16 old
, __be16
new, __wsum oldsum
)
766 __be16 diff
[2] = { ~old
, new };
768 return csum_partial((char *) diff
, sizeof(diff
), oldsum
);
771 #endif /* __KERNEL__ */
773 #endif /* _NET_IP_VS_H */