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migrate_timers: add comment, use spinlock_irq()
[linux-2.6/mini2440.git] / include / net / ip_vs.h
blob7312c3dd309f2cc705a678f29be79a972780f2ec
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 /* old ipvsadm versions still include this file directly */
12 #ifdef __KERNEL__
13
14 #include <asm/types.h> /* for __uXX types */
15
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>
22
23 #include <net/checksum.h>
24
25 #ifdef CONFIG_IP_VS_DEBUG
26 #include <linux/net.h>
27
28 extern int ip_vs_get_debug_level(void);
29 #define IP_VS_DBG(level, msg...) \
30 do { \
31 if (level <= ip_vs_get_debug_level()) \
32 printk(KERN_DEBUG "IPVS: " msg); \
33 } while (0)
34 #define IP_VS_DBG_RL(msg...) \
35 do { \
36 if (net_ratelimit()) \
37 printk(KERN_DEBUG "IPVS: " msg); \
38 } while (0)
39 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
40 do { \
41 if (level <= ip_vs_get_debug_level()) \
42 pp->debug_packet(pp, skb, ofs, msg); \
43 } while (0)
44 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
45 do { \
46 if (level <= ip_vs_get_debug_level() && \
47 net_ratelimit()) \
48 pp->debug_packet(pp, skb, ofs, msg); \
49 } while (0)
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)
55 #endif
56
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...) \
63 do { \
64 if (net_ratelimit()) \
65 printk(KERN_ERR "IPVS: " msg); \
66 } while (0)
67
68 #ifdef CONFIG_IP_VS_DEBUG
69 #define EnterFunction(level) \
70 do { \
71 if (level <= ip_vs_get_debug_level()) \
72 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \
73 __FUNCTION__, __FILE__, __LINE__); \
74 } while (0)
75 #define LeaveFunction(level) \
76 do { \
77 if (level <= ip_vs_get_debug_level()) \
78 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \
79 __FUNCTION__, __FILE__, __LINE__); \
80 } while (0)
81 #else
82 #define EnterFunction(level) do {} while (0)
83 #define LeaveFunction(level) do {} while (0)
84 #endif
85
86 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
87
88
89 /*
90 * The port number of FTP service (in network order).
91 */
92 #define FTPPORT __constant_htons(21)
93 #define FTPDATA __constant_htons(20)
94
95 /*
96 * TCP State Values
97 */
98 enum {
99 IP_VS_TCP_S_NONE = 0,
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,
105 IP_VS_TCP_S_CLOSE,
106 IP_VS_TCP_S_CLOSE_WAIT,
107 IP_VS_TCP_S_LAST_ACK,
108 IP_VS_TCP_S_LISTEN,
109 IP_VS_TCP_S_SYNACK,
110 IP_VS_TCP_S_LAST
111 };
112
113 /*
114 * UDP State Values
115 */
116 enum {
117 IP_VS_UDP_S_NORMAL,
118 IP_VS_UDP_S_LAST,
119 };
120
121 /*
122 * ICMP State Values
123 */
124 enum {
125 IP_VS_ICMP_S_NORMAL,
126 IP_VS_ICMP_S_LAST,
127 };
128
129 /*
130 * Delta sequence info structure
131 * Each ip_vs_conn has 2 (output AND input seq. changes).
132 * Only used in the VS/NAT.
133 */
134 struct ip_vs_seq {
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 */
139 };
140
141
142 /*
143 * IPVS statistics objects
144 */
145 struct ip_vs_estimator {
146 struct list_head list;
147
148 u64 last_inbytes;
149 u64 last_outbytes;
150 u32 last_conns;
151 u32 last_inpkts;
152 u32 last_outpkts;
153
154 u32 cps;
155 u32 inpps;
156 u32 outpps;
157 u32 inbps;
158 u32 outbps;
159 };
160
161 struct ip_vs_stats
162 {
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 */
168
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 */
174
175 /*
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
178 * ip_vs_ctl.c.
179 */
180
181 spinlock_t lock; /* spin lock */
182
183 struct ip_vs_estimator est; /* estimator */
184 };
185
186 struct dst_entry;
187 struct iphdr;
188 struct ip_vs_conn;
189 struct ip_vs_app;
190 struct sk_buff;
191
192 struct ip_vs_protocol {
193 struct ip_vs_protocol *next;
194 char *name;
195 u16 protocol;
196 u16 num_states;
197 int dont_defrag;
198 atomic_t appcnt; /* counter of proto app incs */
199 int *timeout_table; /* protocol timeout table */
200
201 void (*init)(struct ip_vs_protocol *pp);
202
203 void (*exit)(struct ip_vs_protocol *pp);
204
205 int (*conn_schedule)(struct sk_buff *skb,
206 struct ip_vs_protocol *pp,
207 int *verdict, struct ip_vs_conn **cpp);
208
209 struct ip_vs_conn *
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,
214 int inverse);
215
216 struct ip_vs_conn *
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,
221 int inverse);
222
223 int (*snat_handler)(struct sk_buff *skb,
224 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
225
226 int (*dnat_handler)(struct sk_buff *skb,
227 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
228
229 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
230
231 const char *(*state_name)(int state);
232
233 int (*state_transition)(struct ip_vs_conn *cp, int direction,
234 const struct sk_buff *skb,
235 struct ip_vs_protocol *pp);
236
237 int (*register_app)(struct ip_vs_app *inc);
238
239 void (*unregister_app)(struct ip_vs_app *inc);
240
241 int (*app_conn_bind)(struct ip_vs_conn *cp);
242
243 void (*debug_packet)(struct ip_vs_protocol *pp,
244 const struct sk_buff *skb,
245 int offset,
246 const char *msg);
247
248 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
249
250 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
251 };
252
253 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
254
255 /*
256 * IP_VS structure allocated for each dynamically scheduled connection
257 */
258 struct ip_vs_conn {
259 struct list_head c_list; /* hashed list heads */
260
261 /* Protocol, addresses and port numbers */
262 __be32 caddr; /* client address */
263 __be32 vaddr; /* virtual address */
264 __be32 daddr; /* destination address */
265 __be16 cport;
266 __be16 vport;
267 __be16 dport;
268 __u16 protocol; /* Which protocol (TCP/UDP) */
269
270 /* counter and timer */
271 atomic_t refcnt; /* reference count */
272 struct timer_list timer; /* Expiration timer */
273 volatile unsigned long timeout; /* timeout */
274
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
281 * synchronization
282 */
283
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 */
289
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 **.
293 */
294 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
295 struct ip_vs_protocol *pp);
296
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 */
304 };
305
306
307 /*
308 * The information about the virtual service offered to the net
309 * and the forwarding entries
310 */
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 */
316
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 */
324
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 */
329
330 /* for scheduling */
331 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
332 rwlock_t sched_lock; /* lock sched_data */
333 void *sched_data; /* scheduler application data */
334 };
335
336
337 /*
338 * The real server destination forwarding entry
339 * with ip address, port number, and so on.
340 */
341 struct ip_vs_dest {
342 struct list_head n_list; /* for the dests in the service */
343 struct list_head d_list; /* for table with all the dests */
344
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 */
350
351 atomic_t refcnt; /* reference counter */
352 struct ip_vs_stats stats; /* statistics */
353
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 */
360
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 */
365
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 */
372 };
373
374
375 /*
376 * The scheduler object
377 */
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 */
383
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);
390
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);
394 };
395
396
397 /*
398 * The application module object (a.k.a. app incarnation)
399 */
400 struct ip_vs_app
401 {
402 struct list_head a_list; /* member in app list */
403 int type; /* IP_VS_APP_TYPE_xxx */
404 char *name; /* application module name */
405 __u16 protocol;
406 struct module *module; /* THIS_MODULE/NULL */
407 struct list_head incs_list; /* list of incarnations */
408
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 */
414
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);
418
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);
422
423 /* ip_vs_app initializer */
424 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
425
426 /* ip_vs_app finish */
427 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
428
429
430 /* not used now */
431 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
432 struct ip_vs_protocol *);
433
434 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
435
436 int * timeout_table;
437 int * timeouts;
438 int timeouts_size;
439
440 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
441 int *verdict, struct ip_vs_conn **cpp);
442
443 struct ip_vs_conn *
444 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
445 const struct iphdr *iph, unsigned int proto_off,
446 int inverse);
447
448 struct ip_vs_conn *
449 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
450 const struct iphdr *iph, unsigned int proto_off,
451 int inverse);
452
453 int (*state_transition)(struct ip_vs_conn *cp, int direction,
454 const struct sk_buff *skb,
455 struct ip_vs_app *app);
456
457 void (*timeout_change)(struct ip_vs_app *app, int flags);
458 };
459
460
461 /*
462 * IPVS core functions
463 * (from ip_vs_core.c)
464 */
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)))
468
469 #define IP_VS_APP_TYPE_FTP 1
470
471 /*
472 * ip_vs_conn handling functions
473 * (from ip_vs_conn.c)
474 */
475
476 /*
477 * IPVS connection entry hash table
478 */
479 #ifndef CONFIG_IP_VS_TAB_BITS
480 #define CONFIG_IP_VS_TAB_BITS 12
481 #endif
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
485 #endif
486 #if CONFIG_IP_VS_TAB_BITS > 20
487 #define IP_VS_CONN_TAB_BITS 20
488 #endif
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
491 #endif
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)
494
495 enum {
496 IP_VS_DIR_INPUT = 0,
497 IP_VS_DIR_OUTPUT,
498 IP_VS_DIR_INPUT_ONLY,
499 IP_VS_DIR_LAST,
500 };
501
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);
508
509 /* put back the conn without restarting its timer */
510 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
511 {
512 atomic_dec(&cp->refcnt);
513 }
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);
516
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);
522
523 extern const char * ip_vs_state_name(__u16 proto, int state);
524
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);
530
531 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
532 {
533 struct ip_vs_conn *ctl_cp = cp->control;
534 if (!ctl_cp) {
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));
539 return;
540 }
541
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));
546
547 cp->control = NULL;
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));
553 return;
554 }
555 atomic_dec(&ctl_cp->n_control);
556 }
557
558 static inline void
559 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
560 {
561 if (cp->control) {
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);
567 }
568
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));
573
574 cp->control = ctl_cp;
575 atomic_inc(&ctl_cp->n_control);
576 }
577
578
579 /*
580 * IPVS application functions
581 * (from ip_vs_app.c)
582 */
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);
588 extern int
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);
592
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);
599
600
601 /*
602 * IPVS protocol functions (from ip_vs_proto.c)
603 */
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);
608 extern int
609 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
610 extern void
611 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
612 int offset, const char *msg);
613
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;
619
620
621 /*
622 * Registering/unregistering scheduler functions
623 * (from ip_vs_sched.c)
624 */
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);
636
637
638 /*
639 * IPVS control data and functions (from ip_vs_ctl.c)
640 */
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[];
648
649 extern struct ip_vs_service *
650 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
651
652 static inline void ip_vs_service_put(struct ip_vs_service *svc)
653 {
654 atomic_dec(&svc->usecnt);
655 }
656
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);
667
668
669 /*
670 * IPVS sync daemon data and function prototypes
671 * (from ip_vs_sync.c)
672 */
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);
681
682
683 /*
684 * IPVS rate estimator prototypes (from ip_vs_est.c)
685 */
686 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
687 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
688 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
689
690 /*
691 * Various IPVS packet transmitters (from ip_vs_xmit.c)
692 */
693 extern int ip_vs_null_xmit
694 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
695 extern int ip_vs_bypass_xmit
696 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
697 extern int ip_vs_nat_xmit
698 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
699 extern int ip_vs_tunnel_xmit
700 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
701 extern int ip_vs_dr_xmit
702 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
703 extern int ip_vs_icmp_xmit
704 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
705 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
706
707
708 /*
709 * This is a simple mechanism to ignore packets when
710 * we are loaded. Just set ip_vs_drop_rate to 'n' and
711 * we start to drop 1/rate of the packets
712 */
713 extern int ip_vs_drop_rate;
714 extern int ip_vs_drop_counter;
715
716 static __inline__ int ip_vs_todrop(void)
717 {
718 if (!ip_vs_drop_rate) return 0;
719 if (--ip_vs_drop_counter > 0) return 0;
720 ip_vs_drop_counter = ip_vs_drop_rate;
721 return 1;
722 }
723
724 /*
725 * ip_vs_fwd_tag returns the forwarding tag of the connection
726 */
727 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
728
729 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
730 {
731 char fwd;
732
733 switch (IP_VS_FWD_METHOD(cp)) {
734 case IP_VS_CONN_F_MASQ:
735 fwd = 'M'; break;
736 case IP_VS_CONN_F_LOCALNODE:
737 fwd = 'L'; break;
738 case IP_VS_CONN_F_TUNNEL:
739 fwd = 'T'; break;
740 case IP_VS_CONN_F_DROUTE:
741 fwd = 'R'; break;
742 case IP_VS_CONN_F_BYPASS:
743 fwd = 'B'; break;
744 default:
745 fwd = '?'; break;
746 }
747 return fwd;
748 }
749
750 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
751 struct ip_vs_conn *cp, int dir);
752
753 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
754
755 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
756 {
757 __be32 diff[2] = { ~old, new };
758
759 return csum_partial((char *) diff, sizeof(diff), oldsum);
760 }
761
762 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
763 {
764 __be16 diff[2] = { ~old, new };
765
766 return csum_partial((char *) diff, sizeof(diff), oldsum);
767 }
768
769 #endif /* __KERNEL__ */
770
771 #endif /* _NET_IP_VS_H */
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