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[mirror_ubuntu-zesty-kernel.git] / include / net / ip_vs.h
1 /*
2 * IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6 #ifndef _IP_VS_H
7 #define _IP_VS_H
8
9 #include <asm/types.h> /* For __uXX types */
10 #include <linux/types.h> /* For __beXX types in userland */
11
12 #define IP_VS_VERSION_CODE 0x010201
13 #define NVERSION(version) \
14 (version >> 16) & 0xFF, \
15 (version >> 8) & 0xFF, \
16 version & 0xFF
17
18 /*
19 * Virtual Service Flags
20 */
21 #define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */
22 #define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */
23
24 /*
25 * Destination Server Flags
26 */
27 #define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */
28 #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */
29
30 /*
31 * IPVS sync daemon states
32 */
33 #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */
34 #define IP_VS_STATE_MASTER 0x0001 /* started as master */
35 #define IP_VS_STATE_BACKUP 0x0002 /* started as backup */
36
37 /*
38 * IPVS socket options
39 */
40 #define IP_VS_BASE_CTL (64+1024+64) /* base */
41
42 #define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */
43 #define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1)
44 #define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2)
45 #define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3)
46 #define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4)
47 #define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5)
48 #define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6)
49 #define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7)
50 #define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8)
51 #define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9)
52 #define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10)
53 #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11)
54 #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12)
55 #define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13)
56 #define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14)
57 #define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15)
58 #define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO
59
60 #define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL
61 #define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1)
62 #define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2)
63 #define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3)
64 #define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4)
65 #define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */
66 #define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6)
67 #define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7)
68 #define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON
69
70
71 /*
72 * IPVS Connection Flags
73 */
74 #define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */
75 #define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */
76 #define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */
77 #define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */
78 #define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */
79 #define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */
80 #define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */
81 #define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */
82 #define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */
83 #define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */
84 #define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */
85 #define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */
86 #define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */
87 #define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */
88 #define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */
89
90 /* Move it to better place one day, for now keep it unique */
91 #define NFC_IPVS_PROPERTY 0x10000
92
93 #define IP_VS_SCHEDNAME_MAXLEN 16
94 #define IP_VS_IFNAME_MAXLEN 16
95
96
97 /*
98 * The struct ip_vs_service_user and struct ip_vs_dest_user are
99 * used to set IPVS rules through setsockopt.
100 */
101 struct ip_vs_service_user {
102 /* virtual service addresses */
103 u_int16_t protocol;
104 __be32 addr; /* virtual ip address */
105 __be16 port;
106 u_int32_t fwmark; /* firwall mark of service */
107
108 /* virtual service options */
109 char sched_name[IP_VS_SCHEDNAME_MAXLEN];
110 unsigned flags; /* virtual service flags */
111 unsigned timeout; /* persistent timeout in sec */
112 __be32 netmask; /* persistent netmask */
113 };
114
115
116 struct ip_vs_dest_user {
117 /* destination server address */
118 __be32 addr;
119 __be16 port;
120
121 /* real server options */
122 unsigned conn_flags; /* connection flags */
123 int weight; /* destination weight */
124
125 /* thresholds for active connections */
126 u_int32_t u_threshold; /* upper threshold */
127 u_int32_t l_threshold; /* lower threshold */
128 };
129
130
131 /*
132 * IPVS statistics object (for user space)
133 */
134 struct ip_vs_stats_user
135 {
136 __u32 conns; /* connections scheduled */
137 __u32 inpkts; /* incoming packets */
138 __u32 outpkts; /* outgoing packets */
139 __u64 inbytes; /* incoming bytes */
140 __u64 outbytes; /* outgoing bytes */
141
142 __u32 cps; /* current connection rate */
143 __u32 inpps; /* current in packet rate */
144 __u32 outpps; /* current out packet rate */
145 __u32 inbps; /* current in byte rate */
146 __u32 outbps; /* current out byte rate */
147 };
148
149
150 /* The argument to IP_VS_SO_GET_INFO */
151 struct ip_vs_getinfo {
152 /* version number */
153 unsigned int version;
154
155 /* size of connection hash table */
156 unsigned int size;
157
158 /* number of virtual services */
159 unsigned int num_services;
160 };
161
162
163 /* The argument to IP_VS_SO_GET_SERVICE */
164 struct ip_vs_service_entry {
165 /* which service: user fills in these */
166 u_int16_t protocol;
167 __be32 addr; /* virtual address */
168 __be16 port;
169 u_int32_t fwmark; /* firwall mark of service */
170
171 /* service options */
172 char sched_name[IP_VS_SCHEDNAME_MAXLEN];
173 unsigned flags; /* virtual service flags */
174 unsigned timeout; /* persistent timeout */
175 __be32 netmask; /* persistent netmask */
176
177 /* number of real servers */
178 unsigned int num_dests;
179
180 /* statistics */
181 struct ip_vs_stats_user stats;
182 };
183
184
185 struct ip_vs_dest_entry {
186 __be32 addr; /* destination address */
187 __be16 port;
188 unsigned conn_flags; /* connection flags */
189 int weight; /* destination weight */
190
191 u_int32_t u_threshold; /* upper threshold */
192 u_int32_t l_threshold; /* lower threshold */
193
194 u_int32_t activeconns; /* active connections */
195 u_int32_t inactconns; /* inactive connections */
196 u_int32_t persistconns; /* persistent connections */
197
198 /* statistics */
199 struct ip_vs_stats_user stats;
200 };
201
202
203 /* The argument to IP_VS_SO_GET_DESTS */
204 struct ip_vs_get_dests {
205 /* which service: user fills in these */
206 u_int16_t protocol;
207 __be32 addr; /* virtual address */
208 __be16 port;
209 u_int32_t fwmark; /* firwall mark of service */
210
211 /* number of real servers */
212 unsigned int num_dests;
213
214 /* the real servers */
215 struct ip_vs_dest_entry entrytable[0];
216 };
217
218
219 /* The argument to IP_VS_SO_GET_SERVICES */
220 struct ip_vs_get_services {
221 /* number of virtual services */
222 unsigned int num_services;
223
224 /* service table */
225 struct ip_vs_service_entry entrytable[0];
226 };
227
228
229 /* The argument to IP_VS_SO_GET_TIMEOUT */
230 struct ip_vs_timeout_user {
231 int tcp_timeout;
232 int tcp_fin_timeout;
233 int udp_timeout;
234 };
235
236
237 /* The argument to IP_VS_SO_GET_DAEMON */
238 struct ip_vs_daemon_user {
239 /* sync daemon state (master/backup) */
240 int state;
241
242 /* multicast interface name */
243 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
244
245 /* SyncID we belong to */
246 int syncid;
247 };
248
249
250 #ifdef __KERNEL__
251
252 #include <linux/list.h> /* for struct list_head */
253 #include <linux/spinlock.h> /* for struct rwlock_t */
254 #include <asm/atomic.h> /* for struct atomic_t */
255 #include <linux/compiler.h>
256 #include <linux/timer.h>
257
258 #include <net/checksum.h>
259
260 #ifdef CONFIG_IP_VS_DEBUG
261 #include <linux/net.h>
262
263 extern int ip_vs_get_debug_level(void);
264 #define IP_VS_DBG(level, msg...) \
265 do { \
266 if (level <= ip_vs_get_debug_level()) \
267 printk(KERN_DEBUG "IPVS: " msg); \
268 } while (0)
269 #define IP_VS_DBG_RL(msg...) \
270 do { \
271 if (net_ratelimit()) \
272 printk(KERN_DEBUG "IPVS: " msg); \
273 } while (0)
274 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
275 do { \
276 if (level <= ip_vs_get_debug_level()) \
277 pp->debug_packet(pp, skb, ofs, msg); \
278 } while (0)
279 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
280 do { \
281 if (level <= ip_vs_get_debug_level() && \
282 net_ratelimit()) \
283 pp->debug_packet(pp, skb, ofs, msg); \
284 } while (0)
285 #else /* NO DEBUGGING at ALL */
286 #define IP_VS_DBG(level, msg...) do {} while (0)
287 #define IP_VS_DBG_RL(msg...) do {} while (0)
288 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0)
289 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0)
290 #endif
291
292 #define IP_VS_BUG() BUG()
293 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
294 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
295 #define IP_VS_WARNING(msg...) \
296 printk(KERN_WARNING "IPVS: " msg)
297 #define IP_VS_ERR_RL(msg...) \
298 do { \
299 if (net_ratelimit()) \
300 printk(KERN_ERR "IPVS: " msg); \
301 } while (0)
302
303 #ifdef CONFIG_IP_VS_DEBUG
304 #define EnterFunction(level) \
305 do { \
306 if (level <= ip_vs_get_debug_level()) \
307 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \
308 __FUNCTION__, __FILE__, __LINE__); \
309 } while (0)
310 #define LeaveFunction(level) \
311 do { \
312 if (level <= ip_vs_get_debug_level()) \
313 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \
314 __FUNCTION__, __FILE__, __LINE__); \
315 } while (0)
316 #else
317 #define EnterFunction(level) do {} while (0)
318 #define LeaveFunction(level) do {} while (0)
319 #endif
320
321 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
322
323
324 /*
325 * The port number of FTP service (in network order).
326 */
327 #define FTPPORT __constant_htons(21)
328 #define FTPDATA __constant_htons(20)
329
330 /*
331 * TCP State Values
332 */
333 enum {
334 IP_VS_TCP_S_NONE = 0,
335 IP_VS_TCP_S_ESTABLISHED,
336 IP_VS_TCP_S_SYN_SENT,
337 IP_VS_TCP_S_SYN_RECV,
338 IP_VS_TCP_S_FIN_WAIT,
339 IP_VS_TCP_S_TIME_WAIT,
340 IP_VS_TCP_S_CLOSE,
341 IP_VS_TCP_S_CLOSE_WAIT,
342 IP_VS_TCP_S_LAST_ACK,
343 IP_VS_TCP_S_LISTEN,
344 IP_VS_TCP_S_SYNACK,
345 IP_VS_TCP_S_LAST
346 };
347
348 /*
349 * UDP State Values
350 */
351 enum {
352 IP_VS_UDP_S_NORMAL,
353 IP_VS_UDP_S_LAST,
354 };
355
356 /*
357 * ICMP State Values
358 */
359 enum {
360 IP_VS_ICMP_S_NORMAL,
361 IP_VS_ICMP_S_LAST,
362 };
363
364 /*
365 * Delta sequence info structure
366 * Each ip_vs_conn has 2 (output AND input seq. changes).
367 * Only used in the VS/NAT.
368 */
369 struct ip_vs_seq {
370 __u32 init_seq; /* Add delta from this seq */
371 __u32 delta; /* Delta in sequence numbers */
372 __u32 previous_delta; /* Delta in sequence numbers
373 before last resized pkt */
374 };
375
376
377 /*
378 * IPVS statistics object
379 */
380 struct ip_vs_stats
381 {
382 __u32 conns; /* connections scheduled */
383 __u32 inpkts; /* incoming packets */
384 __u32 outpkts; /* outgoing packets */
385 __u64 inbytes; /* incoming bytes */
386 __u64 outbytes; /* outgoing bytes */
387
388 __u32 cps; /* current connection rate */
389 __u32 inpps; /* current in packet rate */
390 __u32 outpps; /* current out packet rate */
391 __u32 inbps; /* current in byte rate */
392 __u32 outbps; /* current out byte rate */
393
394 spinlock_t lock; /* spin lock */
395 };
396
397 struct dst_entry;
398 struct iphdr;
399 struct ip_vs_conn;
400 struct ip_vs_app;
401 struct sk_buff;
402
403 struct ip_vs_protocol {
404 struct ip_vs_protocol *next;
405 char *name;
406 __u16 protocol;
407 int dont_defrag;
408 atomic_t appcnt; /* counter of proto app incs */
409 int *timeout_table; /* protocol timeout table */
410
411 void (*init)(struct ip_vs_protocol *pp);
412
413 void (*exit)(struct ip_vs_protocol *pp);
414
415 int (*conn_schedule)(struct sk_buff *skb,
416 struct ip_vs_protocol *pp,
417 int *verdict, struct ip_vs_conn **cpp);
418
419 struct ip_vs_conn *
420 (*conn_in_get)(const struct sk_buff *skb,
421 struct ip_vs_protocol *pp,
422 const struct iphdr *iph,
423 unsigned int proto_off,
424 int inverse);
425
426 struct ip_vs_conn *
427 (*conn_out_get)(const struct sk_buff *skb,
428 struct ip_vs_protocol *pp,
429 const struct iphdr *iph,
430 unsigned int proto_off,
431 int inverse);
432
433 int (*snat_handler)(struct sk_buff *skb,
434 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
435
436 int (*dnat_handler)(struct sk_buff *skb,
437 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
438
439 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
440
441 const char *(*state_name)(int state);
442
443 int (*state_transition)(struct ip_vs_conn *cp, int direction,
444 const struct sk_buff *skb,
445 struct ip_vs_protocol *pp);
446
447 int (*register_app)(struct ip_vs_app *inc);
448
449 void (*unregister_app)(struct ip_vs_app *inc);
450
451 int (*app_conn_bind)(struct ip_vs_conn *cp);
452
453 void (*debug_packet)(struct ip_vs_protocol *pp,
454 const struct sk_buff *skb,
455 int offset,
456 const char *msg);
457
458 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
459
460 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
461 };
462
463 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
464
465 /*
466 * IP_VS structure allocated for each dynamically scheduled connection
467 */
468 struct ip_vs_conn {
469 struct list_head c_list; /* hashed list heads */
470
471 /* Protocol, addresses and port numbers */
472 __be32 caddr; /* client address */
473 __be32 vaddr; /* virtual address */
474 __be32 daddr; /* destination address */
475 __be16 cport;
476 __be16 vport;
477 __be16 dport;
478 __u16 protocol; /* Which protocol (TCP/UDP) */
479
480 /* counter and timer */
481 atomic_t refcnt; /* reference count */
482 struct timer_list timer; /* Expiration timer */
483 volatile unsigned long timeout; /* timeout */
484
485 /* Flags and state transition */
486 spinlock_t lock; /* lock for state transition */
487 volatile __u16 flags; /* status flags */
488 volatile __u16 state; /* state info */
489 volatile __u16 old_state; /* old state, to be used for
490 * state transition triggerd
491 * synchronization
492 */
493
494 /* Control members */
495 struct ip_vs_conn *control; /* Master control connection */
496 atomic_t n_control; /* Number of controlled ones */
497 struct ip_vs_dest *dest; /* real server */
498 atomic_t in_pkts; /* incoming packet counter */
499
500 /* packet transmitter for different forwarding methods. If it
501 mangles the packet, it must return NF_DROP or better NF_STOLEN,
502 otherwise this must be changed to a sk_buff **.
503 */
504 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
505 struct ip_vs_protocol *pp);
506
507 /* Note: we can group the following members into a structure,
508 in order to save more space, and the following members are
509 only used in VS/NAT anyway */
510 struct ip_vs_app *app; /* bound ip_vs_app object */
511 void *app_data; /* Application private data */
512 struct ip_vs_seq in_seq; /* incoming seq. struct */
513 struct ip_vs_seq out_seq; /* outgoing seq. struct */
514 };
515
516
517 /*
518 * The information about the virtual service offered to the net
519 * and the forwarding entries
520 */
521 struct ip_vs_service {
522 struct list_head s_list; /* for normal service table */
523 struct list_head f_list; /* for fwmark-based service table */
524 atomic_t refcnt; /* reference counter */
525 atomic_t usecnt; /* use counter */
526
527 __u16 protocol; /* which protocol (TCP/UDP) */
528 __be32 addr; /* IP address for virtual service */
529 __be16 port; /* port number for the service */
530 __u32 fwmark; /* firewall mark of the service */
531 unsigned flags; /* service status flags */
532 unsigned timeout; /* persistent timeout in ticks */
533 __be32 netmask; /* grouping granularity */
534
535 struct list_head destinations; /* real server d-linked list */
536 __u32 num_dests; /* number of servers */
537 struct ip_vs_stats stats; /* statistics for the service */
538 struct ip_vs_app *inc; /* bind conns to this app inc */
539
540 /* for scheduling */
541 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
542 rwlock_t sched_lock; /* lock sched_data */
543 void *sched_data; /* scheduler application data */
544 };
545
546
547 /*
548 * The real server destination forwarding entry
549 * with ip address, port number, and so on.
550 */
551 struct ip_vs_dest {
552 struct list_head n_list; /* for the dests in the service */
553 struct list_head d_list; /* for table with all the dests */
554
555 __be32 addr; /* IP address of the server */
556 __be16 port; /* port number of the server */
557 volatile unsigned flags; /* dest status flags */
558 atomic_t conn_flags; /* flags to copy to conn */
559 atomic_t weight; /* server weight */
560
561 atomic_t refcnt; /* reference counter */
562 struct ip_vs_stats stats; /* statistics */
563
564 /* connection counters and thresholds */
565 atomic_t activeconns; /* active connections */
566 atomic_t inactconns; /* inactive connections */
567 atomic_t persistconns; /* persistent connections */
568 __u32 u_threshold; /* upper threshold */
569 __u32 l_threshold; /* lower threshold */
570
571 /* for destination cache */
572 spinlock_t dst_lock; /* lock of dst_cache */
573 struct dst_entry *dst_cache; /* destination cache entry */
574 u32 dst_rtos; /* RT_TOS(tos) for dst */
575
576 /* for virtual service */
577 struct ip_vs_service *svc; /* service it belongs to */
578 __u16 protocol; /* which protocol (TCP/UDP) */
579 __be32 vaddr; /* virtual IP address */
580 __be16 vport; /* virtual port number */
581 __u32 vfwmark; /* firewall mark of service */
582 };
583
584
585 /*
586 * The scheduler object
587 */
588 struct ip_vs_scheduler {
589 struct list_head n_list; /* d-linked list head */
590 char *name; /* scheduler name */
591 atomic_t refcnt; /* reference counter */
592 struct module *module; /* THIS_MODULE/NULL */
593
594 /* scheduler initializing service */
595 int (*init_service)(struct ip_vs_service *svc);
596 /* scheduling service finish */
597 int (*done_service)(struct ip_vs_service *svc);
598 /* scheduler updating service */
599 int (*update_service)(struct ip_vs_service *svc);
600
601 /* selecting a server from the given service */
602 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
603 const struct sk_buff *skb);
604 };
605
606
607 /*
608 * The application module object (a.k.a. app incarnation)
609 */
610 struct ip_vs_app
611 {
612 struct list_head a_list; /* member in app list */
613 int type; /* IP_VS_APP_TYPE_xxx */
614 char *name; /* application module name */
615 __u16 protocol;
616 struct module *module; /* THIS_MODULE/NULL */
617 struct list_head incs_list; /* list of incarnations */
618
619 /* members for application incarnations */
620 struct list_head p_list; /* member in proto app list */
621 struct ip_vs_app *app; /* its real application */
622 __be16 port; /* port number in net order */
623 atomic_t usecnt; /* usage counter */
624
625 /* output hook: return false if can't linearize. diff set for TCP. */
626 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
627 struct sk_buff *, int *diff);
628
629 /* input hook: return false if can't linearize. diff set for TCP. */
630 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
631 struct sk_buff *, int *diff);
632
633 /* ip_vs_app initializer */
634 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
635
636 /* ip_vs_app finish */
637 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
638
639
640 /* not used now */
641 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
642 struct ip_vs_protocol *);
643
644 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
645
646 int * timeout_table;
647 int * timeouts;
648 int timeouts_size;
649
650 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
651 int *verdict, struct ip_vs_conn **cpp);
652
653 struct ip_vs_conn *
654 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
655 const struct iphdr *iph, unsigned int proto_off,
656 int inverse);
657
658 struct ip_vs_conn *
659 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
660 const struct iphdr *iph, unsigned int proto_off,
661 int inverse);
662
663 int (*state_transition)(struct ip_vs_conn *cp, int direction,
664 const struct sk_buff *skb,
665 struct ip_vs_app *app);
666
667 void (*timeout_change)(struct ip_vs_app *app, int flags);
668 };
669
670
671 /*
672 * IPVS core functions
673 * (from ip_vs_core.c)
674 */
675 extern const char *ip_vs_proto_name(unsigned proto);
676 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
677 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0]))
678
679 #define IP_VS_APP_TYPE_FTP 1
680
681 /*
682 * ip_vs_conn handling functions
683 * (from ip_vs_conn.c)
684 */
685
686 /*
687 * IPVS connection entry hash table
688 */
689 #ifndef CONFIG_IP_VS_TAB_BITS
690 #define CONFIG_IP_VS_TAB_BITS 12
691 #endif
692 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
693 #if CONFIG_IP_VS_TAB_BITS < 8
694 #define IP_VS_CONN_TAB_BITS 8
695 #endif
696 #if CONFIG_IP_VS_TAB_BITS > 20
697 #define IP_VS_CONN_TAB_BITS 20
698 #endif
699 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
700 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
701 #endif
702 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
703 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
704
705 enum {
706 IP_VS_DIR_INPUT = 0,
707 IP_VS_DIR_OUTPUT,
708 IP_VS_DIR_INPUT_ONLY,
709 IP_VS_DIR_LAST,
710 };
711
712 extern struct ip_vs_conn *ip_vs_conn_in_get
713 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
714 extern struct ip_vs_conn *ip_vs_ct_in_get
715 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
716 extern struct ip_vs_conn *ip_vs_conn_out_get
717 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
718
719 /* put back the conn without restarting its timer */
720 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
721 {
722 atomic_dec(&cp->refcnt);
723 }
724 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
725 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
726
727 extern struct ip_vs_conn *
728 ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport,
729 __be32 daddr, __be16 dport, unsigned flags,
730 struct ip_vs_dest *dest);
731 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
732
733 extern const char * ip_vs_state_name(__u16 proto, int state);
734
735 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
736 extern int ip_vs_check_template(struct ip_vs_conn *ct);
737 extern void ip_vs_random_dropentry(void);
738 extern int ip_vs_conn_init(void);
739 extern void ip_vs_conn_cleanup(void);
740
741 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
742 {
743 struct ip_vs_conn *ctl_cp = cp->control;
744 if (!ctl_cp) {
745 IP_VS_ERR("request control DEL for uncontrolled: "
746 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
747 NIPQUAD(cp->caddr),ntohs(cp->cport),
748 NIPQUAD(cp->vaddr),ntohs(cp->vport));
749 return;
750 }
751
752 IP_VS_DBG(7, "DELeting control for: "
753 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
754 NIPQUAD(cp->caddr),ntohs(cp->cport),
755 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
756
757 cp->control = NULL;
758 if (atomic_read(&ctl_cp->n_control) == 0) {
759 IP_VS_ERR("BUG control DEL with n=0 : "
760 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
761 NIPQUAD(cp->caddr),ntohs(cp->cport),
762 NIPQUAD(cp->vaddr),ntohs(cp->vport));
763 return;
764 }
765 atomic_dec(&ctl_cp->n_control);
766 }
767
768 static inline void
769 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
770 {
771 if (cp->control) {
772 IP_VS_ERR("request control ADD for already controlled: "
773 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
774 NIPQUAD(cp->caddr),ntohs(cp->cport),
775 NIPQUAD(cp->vaddr),ntohs(cp->vport));
776 ip_vs_control_del(cp);
777 }
778
779 IP_VS_DBG(7, "ADDing control for: "
780 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
781 NIPQUAD(cp->caddr),ntohs(cp->cport),
782 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
783
784 cp->control = ctl_cp;
785 atomic_inc(&ctl_cp->n_control);
786 }
787
788
789 /*
790 * IPVS application functions
791 * (from ip_vs_app.c)
792 */
793 #define IP_VS_APP_MAX_PORTS 8
794 extern int register_ip_vs_app(struct ip_vs_app *app);
795 extern void unregister_ip_vs_app(struct ip_vs_app *app);
796 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
797 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
798 extern int
799 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
800 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
801 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
802
803 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
804 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
805 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
806 char *o_buf, int o_len, char *n_buf, int n_len);
807 extern int ip_vs_app_init(void);
808 extern void ip_vs_app_cleanup(void);
809
810
811 /*
812 * IPVS protocol functions (from ip_vs_proto.c)
813 */
814 extern int ip_vs_protocol_init(void);
815 extern void ip_vs_protocol_cleanup(void);
816 extern void ip_vs_protocol_timeout_change(int flags);
817 extern int *ip_vs_create_timeout_table(int *table, int size);
818 extern int
819 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
820 extern void
821 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
822 int offset, const char *msg);
823
824 extern struct ip_vs_protocol ip_vs_protocol_tcp;
825 extern struct ip_vs_protocol ip_vs_protocol_udp;
826 extern struct ip_vs_protocol ip_vs_protocol_icmp;
827 extern struct ip_vs_protocol ip_vs_protocol_esp;
828 extern struct ip_vs_protocol ip_vs_protocol_ah;
829
830
831 /*
832 * Registering/unregistering scheduler functions
833 * (from ip_vs_sched.c)
834 */
835 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
836 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
837 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
838 struct ip_vs_scheduler *scheduler);
839 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
840 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
841 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
842 extern struct ip_vs_conn *
843 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
844 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
845 struct ip_vs_protocol *pp);
846
847
848 /*
849 * IPVS control data and functions (from ip_vs_ctl.c)
850 */
851 extern int sysctl_ip_vs_cache_bypass;
852 extern int sysctl_ip_vs_expire_nodest_conn;
853 extern int sysctl_ip_vs_expire_quiescent_template;
854 extern int sysctl_ip_vs_sync_threshold[2];
855 extern int sysctl_ip_vs_nat_icmp_send;
856 extern struct ip_vs_stats ip_vs_stats;
857
858 extern struct ip_vs_service *
859 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
860
861 static inline void ip_vs_service_put(struct ip_vs_service *svc)
862 {
863 atomic_dec(&svc->usecnt);
864 }
865
866 extern struct ip_vs_dest *
867 ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport);
868 extern int ip_vs_use_count_inc(void);
869 extern void ip_vs_use_count_dec(void);
870 extern int ip_vs_control_init(void);
871 extern void ip_vs_control_cleanup(void);
872 extern struct ip_vs_dest *
873 ip_vs_find_dest(__be32 daddr, __be16 dport,
874 __be32 vaddr, __be16 vport, __u16 protocol);
875 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
876
877
878 /*
879 * IPVS sync daemon data and function prototypes
880 * (from ip_vs_sync.c)
881 */
882 extern volatile int ip_vs_sync_state;
883 extern volatile int ip_vs_master_syncid;
884 extern volatile int ip_vs_backup_syncid;
885 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
886 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
887 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
888 extern int stop_sync_thread(int state);
889 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
890
891
892 /*
893 * IPVS rate estimator prototypes (from ip_vs_est.c)
894 */
895 extern int ip_vs_new_estimator(struct ip_vs_stats *stats);
896 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
897 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
898
899 /*
900 * Various IPVS packet transmitters (from ip_vs_xmit.c)
901 */
902 extern int ip_vs_null_xmit
903 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
904 extern int ip_vs_bypass_xmit
905 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
906 extern int ip_vs_nat_xmit
907 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
908 extern int ip_vs_tunnel_xmit
909 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
910 extern int ip_vs_dr_xmit
911 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
912 extern int ip_vs_icmp_xmit
913 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
914 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
915
916
917 /*
918 * This is a simple mechanism to ignore packets when
919 * we are loaded. Just set ip_vs_drop_rate to 'n' and
920 * we start to drop 1/rate of the packets
921 */
922 extern int ip_vs_drop_rate;
923 extern int ip_vs_drop_counter;
924
925 static __inline__ int ip_vs_todrop(void)
926 {
927 if (!ip_vs_drop_rate) return 0;
928 if (--ip_vs_drop_counter > 0) return 0;
929 ip_vs_drop_counter = ip_vs_drop_rate;
930 return 1;
931 }
932
933 /*
934 * ip_vs_fwd_tag returns the forwarding tag of the connection
935 */
936 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
937
938 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
939 {
940 char fwd;
941
942 switch (IP_VS_FWD_METHOD(cp)) {
943 case IP_VS_CONN_F_MASQ:
944 fwd = 'M'; break;
945 case IP_VS_CONN_F_LOCALNODE:
946 fwd = 'L'; break;
947 case IP_VS_CONN_F_TUNNEL:
948 fwd = 'T'; break;
949 case IP_VS_CONN_F_DROUTE:
950 fwd = 'R'; break;
951 case IP_VS_CONN_F_BYPASS:
952 fwd = 'B'; break;
953 default:
954 fwd = '?'; break;
955 }
956 return fwd;
957 }
958
959 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
960 struct ip_vs_conn *cp, int dir);
961
962 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
963
964 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
965 {
966 __be32 diff[2] = { ~old, new };
967
968 return csum_partial((char *) diff, sizeof(diff), oldsum);
969 }
970
971 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
972 {
973 __be16 diff[2] = { ~old, new };
974
975 return csum_partial((char *) diff, sizeof(diff), oldsum);
976 }
977
978 #endif /* __KERNEL__ */
979
980 #endif /* _IP_VS_H */
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