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Merge branch 'docs-next' of git://git.lwn.net/linux-2.6
[linux-2.6/next.git] / include / net / ip_vs.h
blob98978e73f666ae83bb93d35aba88196678205ed0
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 #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> /* for ipv6_addr_copy */
28
29 struct ip_vs_iphdr {
30 int len;
31 __u8 protocol;
32 union nf_inet_addr saddr;
33 union nf_inet_addr daddr;
34 };
35
36 static inline void
37 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
38 {
39 #ifdef CONFIG_IP_VS_IPV6
40 if (af == AF_INET6) {
41 const struct ipv6hdr *iph = nh;
42 iphdr->len = sizeof(struct ipv6hdr);
43 iphdr->protocol = iph->nexthdr;
44 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
45 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
46 } else
47 #endif
48 {
49 const struct iphdr *iph = nh;
50 iphdr->len = iph->ihl * 4;
51 iphdr->protocol = iph->protocol;
52 iphdr->saddr.ip = iph->saddr;
53 iphdr->daddr.ip = iph->daddr;
54 }
55 }
56
57 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
58 const union nf_inet_addr *src)
59 {
60 #ifdef CONFIG_IP_VS_IPV6
61 if (af == AF_INET6)
62 ipv6_addr_copy(&dst->in6, &src->in6);
63 else
64 #endif
65 dst->ip = src->ip;
66 }
67
68 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
69 const union nf_inet_addr *b)
70 {
71 #ifdef CONFIG_IP_VS_IPV6
72 if (af == AF_INET6)
73 return ipv6_addr_equal(&a->in6, &b->in6);
74 #endif
75 return a->ip == b->ip;
76 }
77
78 #ifdef CONFIG_IP_VS_DEBUG
79 #include <linux/net.h>
80
81 extern int ip_vs_get_debug_level(void);
82
83 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
84 const union nf_inet_addr *addr,
85 int *idx)
86 {
87 int len;
88 #ifdef CONFIG_IP_VS_IPV6
89 if (af == AF_INET6)
90 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
91 &addr->in6) + 1;
92 else
93 #endif
94 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
95 &addr->ip) + 1;
96
97 *idx += len;
98 BUG_ON(*idx > buf_len + 1);
99 return &buf[*idx - len];
100 }
101
102 #define IP_VS_DBG_BUF(level, msg, ...) \
103 do { \
104 char ip_vs_dbg_buf[160]; \
105 int ip_vs_dbg_idx = 0; \
106 if (level <= ip_vs_get_debug_level()) \
107 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
108 } while (0)
109 #define IP_VS_ERR_BUF(msg...) \
110 do { \
111 char ip_vs_dbg_buf[160]; \
112 int ip_vs_dbg_idx = 0; \
113 pr_err(msg); \
114 } while (0)
115
116 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
117 #define IP_VS_DBG_ADDR(af, addr) \
118 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
119 sizeof(ip_vs_dbg_buf), addr, \
120 &ip_vs_dbg_idx)
121
122 #define IP_VS_DBG(level, msg, ...) \
123 do { \
124 if (level <= ip_vs_get_debug_level()) \
125 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
126 } while (0)
127 #define IP_VS_DBG_RL(msg, ...) \
128 do { \
129 if (net_ratelimit()) \
130 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
131 } while (0)
132 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
133 do { \
134 if (level <= ip_vs_get_debug_level()) \
135 pp->debug_packet(pp, skb, ofs, msg); \
136 } while (0)
137 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
138 do { \
139 if (level <= ip_vs_get_debug_level() && \
140 net_ratelimit()) \
141 pp->debug_packet(pp, skb, ofs, msg); \
142 } while (0)
143 #else /* NO DEBUGGING at ALL */
144 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
145 #define IP_VS_ERR_BUF(msg...) do {} while (0)
146 #define IP_VS_DBG(level, msg...) do {} while (0)
147 #define IP_VS_DBG_RL(msg...) do {} while (0)
148 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0)
149 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0)
150 #endif
151
152 #define IP_VS_BUG() BUG()
153 #define IP_VS_ERR_RL(msg, ...) \
154 do { \
155 if (net_ratelimit()) \
156 pr_err(msg, ##__VA_ARGS__); \
157 } while (0)
158
159 #ifdef CONFIG_IP_VS_DEBUG
160 #define EnterFunction(level) \
161 do { \
162 if (level <= ip_vs_get_debug_level()) \
163 printk(KERN_DEBUG \
164 pr_fmt("Enter: %s, %s line %i\n"), \
165 __func__, __FILE__, __LINE__); \
166 } while (0)
167 #define LeaveFunction(level) \
168 do { \
169 if (level <= ip_vs_get_debug_level()) \
170 printk(KERN_DEBUG \
171 pr_fmt("Leave: %s, %s line %i\n"), \
172 __func__, __FILE__, __LINE__); \
173 } while (0)
174 #else
175 #define EnterFunction(level) do {} while (0)
176 #define LeaveFunction(level) do {} while (0)
177 #endif
178
179 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
180
181
182 /*
183 * The port number of FTP service (in network order).
184 */
185 #define FTPPORT cpu_to_be16(21)
186 #define FTPDATA cpu_to_be16(20)
187
188 /*
189 * TCP State Values
190 */
191 enum {
192 IP_VS_TCP_S_NONE = 0,
193 IP_VS_TCP_S_ESTABLISHED,
194 IP_VS_TCP_S_SYN_SENT,
195 IP_VS_TCP_S_SYN_RECV,
196 IP_VS_TCP_S_FIN_WAIT,
197 IP_VS_TCP_S_TIME_WAIT,
198 IP_VS_TCP_S_CLOSE,
199 IP_VS_TCP_S_CLOSE_WAIT,
200 IP_VS_TCP_S_LAST_ACK,
201 IP_VS_TCP_S_LISTEN,
202 IP_VS_TCP_S_SYNACK,
203 IP_VS_TCP_S_LAST
204 };
205
206 /*
207 * UDP State Values
208 */
209 enum {
210 IP_VS_UDP_S_NORMAL,
211 IP_VS_UDP_S_LAST,
212 };
213
214 /*
215 * ICMP State Values
216 */
217 enum {
218 IP_VS_ICMP_S_NORMAL,
219 IP_VS_ICMP_S_LAST,
220 };
221
222 /*
223 * Delta sequence info structure
224 * Each ip_vs_conn has 2 (output AND input seq. changes).
225 * Only used in the VS/NAT.
226 */
227 struct ip_vs_seq {
228 __u32 init_seq; /* Add delta from this seq */
229 __u32 delta; /* Delta in sequence numbers */
230 __u32 previous_delta; /* Delta in sequence numbers
231 before last resized pkt */
232 };
233
234
235 /*
236 * IPVS statistics objects
237 */
238 struct ip_vs_estimator {
239 struct list_head list;
240
241 u64 last_inbytes;
242 u64 last_outbytes;
243 u32 last_conns;
244 u32 last_inpkts;
245 u32 last_outpkts;
246
247 u32 cps;
248 u32 inpps;
249 u32 outpps;
250 u32 inbps;
251 u32 outbps;
252 };
253
254 struct ip_vs_stats
255 {
256 struct ip_vs_stats_user ustats; /* statistics */
257 struct ip_vs_estimator est; /* estimator */
258
259 spinlock_t lock; /* spin lock */
260 };
261
262 struct dst_entry;
263 struct iphdr;
264 struct ip_vs_conn;
265 struct ip_vs_app;
266 struct sk_buff;
267
268 struct ip_vs_protocol {
269 struct ip_vs_protocol *next;
270 char *name;
271 u16 protocol;
272 u16 num_states;
273 int dont_defrag;
274 atomic_t appcnt; /* counter of proto app incs */
275 int *timeout_table; /* protocol timeout table */
276
277 void (*init)(struct ip_vs_protocol *pp);
278
279 void (*exit)(struct ip_vs_protocol *pp);
280
281 int (*conn_schedule)(int af, struct sk_buff *skb,
282 struct ip_vs_protocol *pp,
283 int *verdict, struct ip_vs_conn **cpp);
284
285 struct ip_vs_conn *
286 (*conn_in_get)(int af,
287 const struct sk_buff *skb,
288 struct ip_vs_protocol *pp,
289 const struct ip_vs_iphdr *iph,
290 unsigned int proto_off,
291 int inverse);
292
293 struct ip_vs_conn *
294 (*conn_out_get)(int af,
295 const struct sk_buff *skb,
296 struct ip_vs_protocol *pp,
297 const struct ip_vs_iphdr *iph,
298 unsigned int proto_off,
299 int inverse);
300
301 int (*snat_handler)(struct sk_buff *skb,
302 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
303
304 int (*dnat_handler)(struct sk_buff *skb,
305 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
306
307 int (*csum_check)(int af, struct sk_buff *skb,
308 struct ip_vs_protocol *pp);
309
310 const char *(*state_name)(int state);
311
312 int (*state_transition)(struct ip_vs_conn *cp, int direction,
313 const struct sk_buff *skb,
314 struct ip_vs_protocol *pp);
315
316 int (*register_app)(struct ip_vs_app *inc);
317
318 void (*unregister_app)(struct ip_vs_app *inc);
319
320 int (*app_conn_bind)(struct ip_vs_conn *cp);
321
322 void (*debug_packet)(struct ip_vs_protocol *pp,
323 const struct sk_buff *skb,
324 int offset,
325 const char *msg);
326
327 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
328
329 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
330 };
331
332 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
333
334 /*
335 * IP_VS structure allocated for each dynamically scheduled connection
336 */
337 struct ip_vs_conn {
338 struct list_head c_list; /* hashed list heads */
339
340 /* Protocol, addresses and port numbers */
341 u16 af; /* address family */
342 union nf_inet_addr caddr; /* client address */
343 union nf_inet_addr vaddr; /* virtual address */
344 union nf_inet_addr daddr; /* destination address */
345 __be16 cport;
346 __be16 vport;
347 __be16 dport;
348 __u16 protocol; /* Which protocol (TCP/UDP) */
349
350 /* counter and timer */
351 atomic_t refcnt; /* reference count */
352 struct timer_list timer; /* Expiration timer */
353 volatile unsigned long timeout; /* timeout */
354
355 /* Flags and state transition */
356 spinlock_t lock; /* lock for state transition */
357 volatile __u16 flags; /* status flags */
358 volatile __u16 state; /* state info */
359 volatile __u16 old_state; /* old state, to be used for
360 * state transition triggerd
361 * synchronization
362 */
363
364 /* Control members */
365 struct ip_vs_conn *control; /* Master control connection */
366 atomic_t n_control; /* Number of controlled ones */
367 struct ip_vs_dest *dest; /* real server */
368 atomic_t in_pkts; /* incoming packet counter */
369
370 /* packet transmitter for different forwarding methods. If it
371 mangles the packet, it must return NF_DROP or better NF_STOLEN,
372 otherwise this must be changed to a sk_buff **.
373 */
374 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
375 struct ip_vs_protocol *pp);
376
377 /* Note: we can group the following members into a structure,
378 in order to save more space, and the following members are
379 only used in VS/NAT anyway */
380 struct ip_vs_app *app; /* bound ip_vs_app object */
381 void *app_data; /* Application private data */
382 struct ip_vs_seq in_seq; /* incoming seq. struct */
383 struct ip_vs_seq out_seq; /* outgoing seq. struct */
384 };
385
386
387 /*
388 * Extended internal versions of struct ip_vs_service_user and
389 * ip_vs_dest_user for IPv6 support.
390 *
391 * We need these to conveniently pass around service and destination
392 * options, but unfortunately, we also need to keep the old definitions to
393 * maintain userspace backwards compatibility for the setsockopt interface.
394 */
395 struct ip_vs_service_user_kern {
396 /* virtual service addresses */
397 u16 af;
398 u16 protocol;
399 union nf_inet_addr addr; /* virtual ip address */
400 u16 port;
401 u32 fwmark; /* firwall mark of service */
402
403 /* virtual service options */
404 char *sched_name;
405 unsigned flags; /* virtual service flags */
406 unsigned timeout; /* persistent timeout in sec */
407 u32 netmask; /* persistent netmask */
408 };
409
410
411 struct ip_vs_dest_user_kern {
412 /* destination server address */
413 union nf_inet_addr addr;
414 u16 port;
415
416 /* real server options */
417 unsigned conn_flags; /* connection flags */
418 int weight; /* destination weight */
419
420 /* thresholds for active connections */
421 u32 u_threshold; /* upper threshold */
422 u32 l_threshold; /* lower threshold */
423 };
424
425
426 /*
427 * The information about the virtual service offered to the net
428 * and the forwarding entries
429 */
430 struct ip_vs_service {
431 struct list_head s_list; /* for normal service table */
432 struct list_head f_list; /* for fwmark-based service table */
433 atomic_t refcnt; /* reference counter */
434 atomic_t usecnt; /* use counter */
435
436 u16 af; /* address family */
437 __u16 protocol; /* which protocol (TCP/UDP) */
438 union nf_inet_addr addr; /* IP address for virtual service */
439 __be16 port; /* port number for the service */
440 __u32 fwmark; /* firewall mark of the service */
441 unsigned flags; /* service status flags */
442 unsigned timeout; /* persistent timeout in ticks */
443 __be32 netmask; /* grouping granularity */
444
445 struct list_head destinations; /* real server d-linked list */
446 __u32 num_dests; /* number of servers */
447 struct ip_vs_stats stats; /* statistics for the service */
448 struct ip_vs_app *inc; /* bind conns to this app inc */
449
450 /* for scheduling */
451 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
452 rwlock_t sched_lock; /* lock sched_data */
453 void *sched_data; /* scheduler application data */
454 };
455
456
457 /*
458 * The real server destination forwarding entry
459 * with ip address, port number, and so on.
460 */
461 struct ip_vs_dest {
462 struct list_head n_list; /* for the dests in the service */
463 struct list_head d_list; /* for table with all the dests */
464
465 u16 af; /* address family */
466 union nf_inet_addr addr; /* IP address of the server */
467 __be16 port; /* port number of the server */
468 volatile unsigned flags; /* dest status flags */
469 atomic_t conn_flags; /* flags to copy to conn */
470 atomic_t weight; /* server weight */
471
472 atomic_t refcnt; /* reference counter */
473 struct ip_vs_stats stats; /* statistics */
474
475 /* connection counters and thresholds */
476 atomic_t activeconns; /* active connections */
477 atomic_t inactconns; /* inactive connections */
478 atomic_t persistconns; /* persistent connections */
479 __u32 u_threshold; /* upper threshold */
480 __u32 l_threshold; /* lower threshold */
481
482 /* for destination cache */
483 spinlock_t dst_lock; /* lock of dst_cache */
484 struct dst_entry *dst_cache; /* destination cache entry */
485 u32 dst_rtos; /* RT_TOS(tos) for dst */
486
487 /* for virtual service */
488 struct ip_vs_service *svc; /* service it belongs to */
489 __u16 protocol; /* which protocol (TCP/UDP) */
490 union nf_inet_addr vaddr; /* virtual IP address */
491 __be16 vport; /* virtual port number */
492 __u32 vfwmark; /* firewall mark of service */
493 };
494
495
496 /*
497 * The scheduler object
498 */
499 struct ip_vs_scheduler {
500 struct list_head n_list; /* d-linked list head */
501 char *name; /* scheduler name */
502 atomic_t refcnt; /* reference counter */
503 struct module *module; /* THIS_MODULE/NULL */
504
505 /* scheduler initializing service */
506 int (*init_service)(struct ip_vs_service *svc);
507 /* scheduling service finish */
508 int (*done_service)(struct ip_vs_service *svc);
509 /* scheduler updating service */
510 int (*update_service)(struct ip_vs_service *svc);
511
512 /* selecting a server from the given service */
513 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
514 const struct sk_buff *skb);
515 };
516
517
518 /*
519 * The application module object (a.k.a. app incarnation)
520 */
521 struct ip_vs_app
522 {
523 struct list_head a_list; /* member in app list */
524 int type; /* IP_VS_APP_TYPE_xxx */
525 char *name; /* application module name */
526 __u16 protocol;
527 struct module *module; /* THIS_MODULE/NULL */
528 struct list_head incs_list; /* list of incarnations */
529
530 /* members for application incarnations */
531 struct list_head p_list; /* member in proto app list */
532 struct ip_vs_app *app; /* its real application */
533 __be16 port; /* port number in net order */
534 atomic_t usecnt; /* usage counter */
535
536 /* output hook: return false if can't linearize. diff set for TCP. */
537 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
538 struct sk_buff *, int *diff);
539
540 /* input hook: return false if can't linearize. diff set for TCP. */
541 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
542 struct sk_buff *, int *diff);
543
544 /* ip_vs_app initializer */
545 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
546
547 /* ip_vs_app finish */
548 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
549
550
551 /* not used now */
552 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
553 struct ip_vs_protocol *);
554
555 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
556
557 int * timeout_table;
558 int * timeouts;
559 int timeouts_size;
560
561 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
562 int *verdict, struct ip_vs_conn **cpp);
563
564 struct ip_vs_conn *
565 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
566 const struct iphdr *iph, unsigned int proto_off,
567 int inverse);
568
569 struct ip_vs_conn *
570 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
571 const struct iphdr *iph, unsigned int proto_off,
572 int inverse);
573
574 int (*state_transition)(struct ip_vs_conn *cp, int direction,
575 const struct sk_buff *skb,
576 struct ip_vs_app *app);
577
578 void (*timeout_change)(struct ip_vs_app *app, int flags);
579 };
580
581
582 /*
583 * IPVS core functions
584 * (from ip_vs_core.c)
585 */
586 extern const char *ip_vs_proto_name(unsigned proto);
587 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
588 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
589
590 #define IP_VS_APP_TYPE_FTP 1
591
592 /*
593 * ip_vs_conn handling functions
594 * (from ip_vs_conn.c)
595 */
596
597 /*
598 * IPVS connection entry hash table
599 */
600 #ifndef CONFIG_IP_VS_TAB_BITS
601 #define CONFIG_IP_VS_TAB_BITS 12
602 #endif
603
604 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
605 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
606 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
607
608 enum {
609 IP_VS_DIR_INPUT = 0,
610 IP_VS_DIR_OUTPUT,
611 IP_VS_DIR_INPUT_ONLY,
612 IP_VS_DIR_LAST,
613 };
614
615 extern struct ip_vs_conn *ip_vs_conn_in_get
616 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
617 const union nf_inet_addr *d_addr, __be16 d_port);
618
619 extern struct ip_vs_conn *ip_vs_ct_in_get
620 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
621 const union nf_inet_addr *d_addr, __be16 d_port);
622
623 extern struct ip_vs_conn *ip_vs_conn_out_get
624 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
625 const union nf_inet_addr *d_addr, __be16 d_port);
626
627 /* put back the conn without restarting its timer */
628 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
629 {
630 atomic_dec(&cp->refcnt);
631 }
632 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
633 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
634
635 extern struct ip_vs_conn *
636 ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport,
637 const union nf_inet_addr *vaddr, __be16 vport,
638 const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
639 struct ip_vs_dest *dest);
640 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
641
642 extern const char * ip_vs_state_name(__u16 proto, int state);
643
644 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
645 extern int ip_vs_check_template(struct ip_vs_conn *ct);
646 extern void ip_vs_random_dropentry(void);
647 extern int ip_vs_conn_init(void);
648 extern void ip_vs_conn_cleanup(void);
649
650 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
651 {
652 struct ip_vs_conn *ctl_cp = cp->control;
653 if (!ctl_cp) {
654 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
655 "%s:%d to %s:%d\n",
656 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
657 ntohs(cp->cport),
658 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
659 ntohs(cp->vport));
660
661 return;
662 }
663
664 IP_VS_DBG_BUF(7, "DELeting control for: "
665 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
666 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
667 ntohs(cp->cport),
668 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
669 ntohs(ctl_cp->cport));
670
671 cp->control = NULL;
672 if (atomic_read(&ctl_cp->n_control) == 0) {
673 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
674 "%s:%d to %s:%d\n",
675 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
676 ntohs(cp->cport),
677 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
678 ntohs(cp->vport));
679
680 return;
681 }
682 atomic_dec(&ctl_cp->n_control);
683 }
684
685 static inline void
686 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
687 {
688 if (cp->control) {
689 IP_VS_ERR_BUF("request control ADD for already controlled: "
690 "%s:%d to %s:%d\n",
691 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
692 ntohs(cp->cport),
693 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
694 ntohs(cp->vport));
695
696 ip_vs_control_del(cp);
697 }
698
699 IP_VS_DBG_BUF(7, "ADDing control for: "
700 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
701 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
702 ntohs(cp->cport),
703 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
704 ntohs(ctl_cp->cport));
705
706 cp->control = ctl_cp;
707 atomic_inc(&ctl_cp->n_control);
708 }
709
710
711 /*
712 * IPVS application functions
713 * (from ip_vs_app.c)
714 */
715 #define IP_VS_APP_MAX_PORTS 8
716 extern int register_ip_vs_app(struct ip_vs_app *app);
717 extern void unregister_ip_vs_app(struct ip_vs_app *app);
718 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
719 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
720 extern int
721 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
722 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
723 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
724
725 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
726 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
727 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
728 char *o_buf, int o_len, char *n_buf, int n_len);
729 extern int ip_vs_app_init(void);
730 extern void ip_vs_app_cleanup(void);
731
732
733 /*
734 * IPVS protocol functions (from ip_vs_proto.c)
735 */
736 extern int ip_vs_protocol_init(void);
737 extern void ip_vs_protocol_cleanup(void);
738 extern void ip_vs_protocol_timeout_change(int flags);
739 extern int *ip_vs_create_timeout_table(int *table, int size);
740 extern int
741 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
742 const char *name, int to);
743 extern void
744 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
745 int offset, const char *msg);
746
747 extern struct ip_vs_protocol ip_vs_protocol_tcp;
748 extern struct ip_vs_protocol ip_vs_protocol_udp;
749 extern struct ip_vs_protocol ip_vs_protocol_icmp;
750 extern struct ip_vs_protocol ip_vs_protocol_esp;
751 extern struct ip_vs_protocol ip_vs_protocol_ah;
752
753
754 /*
755 * Registering/unregistering scheduler functions
756 * (from ip_vs_sched.c)
757 */
758 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
759 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
760 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
761 struct ip_vs_scheduler *scheduler);
762 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
763 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
764 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
765 extern struct ip_vs_conn *
766 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
767 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
768 struct ip_vs_protocol *pp);
769
770
771 /*
772 * IPVS control data and functions (from ip_vs_ctl.c)
773 */
774 extern int sysctl_ip_vs_cache_bypass;
775 extern int sysctl_ip_vs_expire_nodest_conn;
776 extern int sysctl_ip_vs_expire_quiescent_template;
777 extern int sysctl_ip_vs_sync_threshold[2];
778 extern int sysctl_ip_vs_nat_icmp_send;
779 extern struct ip_vs_stats ip_vs_stats;
780 extern const struct ctl_path net_vs_ctl_path[];
781
782 extern struct ip_vs_service *
783 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
784 const union nf_inet_addr *vaddr, __be16 vport);
785
786 static inline void ip_vs_service_put(struct ip_vs_service *svc)
787 {
788 atomic_dec(&svc->usecnt);
789 }
790
791 extern struct ip_vs_dest *
792 ip_vs_lookup_real_service(int af, __u16 protocol,
793 const union nf_inet_addr *daddr, __be16 dport);
794
795 extern int ip_vs_use_count_inc(void);
796 extern void ip_vs_use_count_dec(void);
797 extern int ip_vs_control_init(void);
798 extern void ip_vs_control_cleanup(void);
799 extern struct ip_vs_dest *
800 ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
801 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
802 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
803
804
805 /*
806 * IPVS sync daemon data and function prototypes
807 * (from ip_vs_sync.c)
808 */
809 extern volatile int ip_vs_sync_state;
810 extern volatile int ip_vs_master_syncid;
811 extern volatile int ip_vs_backup_syncid;
812 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
813 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
814 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
815 extern int stop_sync_thread(int state);
816 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
817
818
819 /*
820 * IPVS rate estimator prototypes (from ip_vs_est.c)
821 */
822 extern int ip_vs_estimator_init(void);
823 extern void ip_vs_estimator_cleanup(void);
824 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
825 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
826 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
827
828 /*
829 * Various IPVS packet transmitters (from ip_vs_xmit.c)
830 */
831 extern int ip_vs_null_xmit
832 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
833 extern int ip_vs_bypass_xmit
834 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
835 extern int ip_vs_nat_xmit
836 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
837 extern int ip_vs_tunnel_xmit
838 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
839 extern int ip_vs_dr_xmit
840 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
841 extern int ip_vs_icmp_xmit
842 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
843 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
844
845 #ifdef CONFIG_IP_VS_IPV6
846 extern int ip_vs_bypass_xmit_v6
847 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
848 extern int ip_vs_nat_xmit_v6
849 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
850 extern int ip_vs_tunnel_xmit_v6
851 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
852 extern int ip_vs_dr_xmit_v6
853 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
854 extern int ip_vs_icmp_xmit_v6
855 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
856 int offset);
857 #endif
858
859 /*
860 * This is a simple mechanism to ignore packets when
861 * we are loaded. Just set ip_vs_drop_rate to 'n' and
862 * we start to drop 1/rate of the packets
863 */
864 extern int ip_vs_drop_rate;
865 extern int ip_vs_drop_counter;
866
867 static __inline__ int ip_vs_todrop(void)
868 {
869 if (!ip_vs_drop_rate) return 0;
870 if (--ip_vs_drop_counter > 0) return 0;
871 ip_vs_drop_counter = ip_vs_drop_rate;
872 return 1;
873 }
874
875 /*
876 * ip_vs_fwd_tag returns the forwarding tag of the connection
877 */
878 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
879
880 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
881 {
882 char fwd;
883
884 switch (IP_VS_FWD_METHOD(cp)) {
885 case IP_VS_CONN_F_MASQ:
886 fwd = 'M'; break;
887 case IP_VS_CONN_F_LOCALNODE:
888 fwd = 'L'; break;
889 case IP_VS_CONN_F_TUNNEL:
890 fwd = 'T'; break;
891 case IP_VS_CONN_F_DROUTE:
892 fwd = 'R'; break;
893 case IP_VS_CONN_F_BYPASS:
894 fwd = 'B'; break;
895 default:
896 fwd = '?'; break;
897 }
898 return fwd;
899 }
900
901 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
902 struct ip_vs_conn *cp, int dir);
903
904 #ifdef CONFIG_IP_VS_IPV6
905 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
906 struct ip_vs_conn *cp, int dir);
907 #endif
908
909 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
910
911 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
912 {
913 __be32 diff[2] = { ~old, new };
914
915 return csum_partial(diff, sizeof(diff), oldsum);
916 }
917
918 #ifdef CONFIG_IP_VS_IPV6
919 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
920 __wsum oldsum)
921 {
922 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
923 new[3], new[2], new[1], new[0] };
924
925 return csum_partial(diff, sizeof(diff), oldsum);
926 }
927 #endif
928
929 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
930 {
931 __be16 diff[2] = { ~old, new };
932
933 return csum_partial(diff, sizeof(diff), oldsum);
934 }
935
936 #endif /* __KERNEL__ */
937
938 #endif /* _NET_IP_VS_H */
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