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cfq-iosched: fix rcu freeing of cfq io contexts
[deliverable/linux.git] / include / net / ip_vs.h
CommitLineData
1da177e4
LT		 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 */
da413908 10#include <linux/types.h> /* For __beXX types in userland */
1da177e4 11
90754f8e
PE		 12#include <linux/sysctl.h> /* For ctl_path */
13
1da177e4
LT		 14#define IP_VS_VERSION_CODE 0x010201
15#define NVERSION(version) \
16 (version >> 16) & 0xFF, \
17 (version >> 8) & 0xFF, \
18 version & 0xFF
19
20/*
21 * Virtual Service Flags
22 */
23#define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */
24#define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */
25
26/*
27 * Destination Server Flags
28 */
29#define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */
30#define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */
31
32/*
33 * IPVS sync daemon states
34 */
35#define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */
36#define IP_VS_STATE_MASTER 0x0001 /* started as master */
37#define IP_VS_STATE_BACKUP 0x0002 /* started as backup */
38
39/*
40 * IPVS socket options
41 */
42#define IP_VS_BASE_CTL (64+1024+64) /* base */
43
44#define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */
45#define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1)
46#define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2)
47#define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3)
48#define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4)
49#define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5)
50#define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6)
51#define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7)
52#define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8)
53#define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9)
54#define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10)
55#define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11)
56#define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12)
57#define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13)
58#define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14)
59#define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15)
60#define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO
61
62#define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL
63#define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1)
64#define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2)
65#define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3)
66#define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4)
67#define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */
68#define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6)
69#define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7)
70#define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON
71
72
73/*
74 * IPVS Connection Flags
75 */
76#define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */
77#define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */
78#define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */
79#define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */
80#define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */
81#define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */
82#define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */
83#define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */
84#define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */
85#define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */
86#define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */
87#define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */
88#define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */
89#define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */
87375ab4 90#define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */
1da177e4
LT		 91
92/* Move it to better place one day, for now keep it unique */
93#define NFC_IPVS_PROPERTY 0x10000
94
95#define IP_VS_SCHEDNAME_MAXLEN 16
96#define IP_VS_IFNAME_MAXLEN 16
97
98
99/*
100 * The struct ip_vs_service_user and struct ip_vs_dest_user are
101 * used to set IPVS rules through setsockopt.
102 */
103struct ip_vs_service_user {
104 /* virtual service addresses */
105 u_int16_t protocol;
014d730d
AV		 106 __be32 addr; /* virtual ip address */
107 __be16 port;
1da177e4
LT		 108 u_int32_t fwmark; /* firwall mark of service */
109
110 /* virtual service options */
111 char sched_name[IP_VS_SCHEDNAME_MAXLEN];
112 unsigned flags; /* virtual service flags */
113 unsigned timeout; /* persistent timeout in sec */
014d730d 114 __be32 netmask; /* persistent netmask */
1da177e4
LT		 115};
116
117
118struct ip_vs_dest_user {
119 /* destination server address */
014d730d
AV		 120 __be32 addr;
121 __be16 port;
1da177e4
LT		 122
123 /* real server options */
124 unsigned conn_flags; /* connection flags */
125 int weight; /* destination weight */
126
127 /* thresholds for active connections */
128 u_int32_t u_threshold; /* upper threshold */
129 u_int32_t l_threshold; /* lower threshold */
130};
131
132
133/*
134 * IPVS statistics object (for user space)
135 */
136struct ip_vs_stats_user
137{
138 __u32 conns; /* connections scheduled */
139 __u32 inpkts; /* incoming packets */
140 __u32 outpkts; /* outgoing packets */
141 __u64 inbytes; /* incoming bytes */
142 __u64 outbytes; /* outgoing bytes */
143
144 __u32 cps; /* current connection rate */
145 __u32 inpps; /* current in packet rate */
146 __u32 outpps; /* current out packet rate */
147 __u32 inbps; /* current in byte rate */
148 __u32 outbps; /* current out byte rate */
149};
150
151
152/* The argument to IP_VS_SO_GET_INFO */
153struct ip_vs_getinfo {
154 /* version number */
155 unsigned int version;
156
157 /* size of connection hash table */
158 unsigned int size;
159
160 /* number of virtual services */
161 unsigned int num_services;
162};
163
164
165/* The argument to IP_VS_SO_GET_SERVICE */
166struct ip_vs_service_entry {
167 /* which service: user fills in these */
168 u_int16_t protocol;
014d730d
AV		 169 __be32 addr; /* virtual address */
170 __be16 port;
1da177e4
LT		 171 u_int32_t fwmark; /* firwall mark of service */
172
173 /* service options */
174 char sched_name[IP_VS_SCHEDNAME_MAXLEN];
175 unsigned flags; /* virtual service flags */
176 unsigned timeout; /* persistent timeout */
014d730d 177 __be32 netmask; /* persistent netmask */
1da177e4
LT		 178
179 /* number of real servers */
180 unsigned int num_dests;
181
182 /* statistics */
183 struct ip_vs_stats_user stats;
184};
185
186
187struct ip_vs_dest_entry {
014d730d
AV		 188 __be32 addr; /* destination address */
189 __be16 port;
1da177e4
LT		 190 unsigned conn_flags; /* connection flags */
191 int weight; /* destination weight */
192
193 u_int32_t u_threshold; /* upper threshold */
194 u_int32_t l_threshold; /* lower threshold */
195
196 u_int32_t activeconns; /* active connections */
197 u_int32_t inactconns; /* inactive connections */
198 u_int32_t persistconns; /* persistent connections */
199
200 /* statistics */
201 struct ip_vs_stats_user stats;
202};
203
204
205/* The argument to IP_VS_SO_GET_DESTS */
206struct ip_vs_get_dests {
207 /* which service: user fills in these */
208 u_int16_t protocol;
014d730d
AV		 209 __be32 addr; /* virtual address */
210 __be16 port;
1da177e4
LT		 211 u_int32_t fwmark; /* firwall mark of service */
212
213 /* number of real servers */
214 unsigned int num_dests;
215
216 /* the real servers */
217 struct ip_vs_dest_entry entrytable[0];
218};
219
220
221/* The argument to IP_VS_SO_GET_SERVICES */
222struct ip_vs_get_services {
223 /* number of virtual services */
224 unsigned int num_services;
225
226 /* service table */
227 struct ip_vs_service_entry entrytable[0];
228};
229
230
231/* The argument to IP_VS_SO_GET_TIMEOUT */
232struct ip_vs_timeout_user {
233 int tcp_timeout;
234 int tcp_fin_timeout;
235 int udp_timeout;
236};
237
238
239/* The argument to IP_VS_SO_GET_DAEMON */
240struct ip_vs_daemon_user {
241 /* sync daemon state (master/backup) */
242 int state;
243
244 /* multicast interface name */
245 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
246
247 /* SyncID we belong to */
248 int syncid;
249};
250
251
252#ifdef __KERNEL__
253
1da177e4
LT		 254#include <linux/list.h> /* for struct list_head */
255#include <linux/spinlock.h> /* for struct rwlock_t */
1da177e4 256#include <asm/atomic.h> /* for struct atomic_t */
1da177e4 257#include <linux/compiler.h>
14c85021 258#include <linux/timer.h>
1da177e4 259
14c85021 260#include <net/checksum.h>
1da177e4
LT		 261
262#ifdef CONFIG_IP_VS_DEBUG
14c85021
ACM		 263#include <linux/net.h>
264
1da177e4
LT		 265extern int ip_vs_get_debug_level(void);
266#define IP_VS_DBG(level, msg...) \
267 do { \
268 if (level <= ip_vs_get_debug_level()) \
269 printk(KERN_DEBUG "IPVS: " msg); \
270 } while (0)
271#define IP_VS_DBG_RL(msg...) \
272 do { \
273 if (net_ratelimit()) \
274 printk(KERN_DEBUG "IPVS: " msg); \
275 } while (0)
276#define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
277 do { \
278 if (level <= ip_vs_get_debug_level()) \
279 pp->debug_packet(pp, skb, ofs, msg); \
280 } while (0)
281#define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
282 do { \
283 if (level <= ip_vs_get_debug_level() && \
284 net_ratelimit()) \
285 pp->debug_packet(pp, skb, ofs, msg); \
286 } while (0)
287#else /* NO DEBUGGING at ALL */
288#define IP_VS_DBG(level, msg...) do {} while (0)
289#define IP_VS_DBG_RL(msg...) do {} while (0)
290#define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0)
291#define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0)
292#endif
293
294#define IP_VS_BUG() BUG()
295#define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
296#define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
297#define IP_VS_WARNING(msg...) \
298 printk(KERN_WARNING "IPVS: " msg)
299#define IP_VS_ERR_RL(msg...) \
300 do { \
301 if (net_ratelimit()) \
302 printk(KERN_ERR "IPVS: " msg); \
303 } while (0)
304
305#ifdef CONFIG_IP_VS_DEBUG
306#define EnterFunction(level) \
307 do { \
308 if (level <= ip_vs_get_debug_level()) \
309 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \
310 __FUNCTION__, __FILE__, __LINE__); \
311 } while (0)
312#define LeaveFunction(level) \
313 do { \
314 if (level <= ip_vs_get_debug_level()) \
315 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \
316 __FUNCTION__, __FILE__, __LINE__); \
317 } while (0)
318#else
319#define EnterFunction(level) do {} while (0)
320#define LeaveFunction(level) do {} while (0)
321#endif
322
323#define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
324
325
326/*
327 * The port number of FTP service (in network order).
328 */
329#define FTPPORT __constant_htons(21)
330#define FTPDATA __constant_htons(20)
331
1da177e4
LT		 332/*
333 * TCP State Values
334 */
335enum {
336 IP_VS_TCP_S_NONE = 0,
337 IP_VS_TCP_S_ESTABLISHED,
338 IP_VS_TCP_S_SYN_SENT,
339 IP_VS_TCP_S_SYN_RECV,
340 IP_VS_TCP_S_FIN_WAIT,
341 IP_VS_TCP_S_TIME_WAIT,
342 IP_VS_TCP_S_CLOSE,
343 IP_VS_TCP_S_CLOSE_WAIT,
344 IP_VS_TCP_S_LAST_ACK,
345 IP_VS_TCP_S_LISTEN,
346 IP_VS_TCP_S_SYNACK,
347 IP_VS_TCP_S_LAST
348};
349
350/*
351 * UDP State Values
352 */
353enum {
354 IP_VS_UDP_S_NORMAL,
355 IP_VS_UDP_S_LAST,
356};
357
358/*
359 * ICMP State Values
360 */
361enum {
362 IP_VS_ICMP_S_NORMAL,
363 IP_VS_ICMP_S_LAST,
364};
365
366/*
367 * Delta sequence info structure
368 * Each ip_vs_conn has 2 (output AND input seq. changes).
369 * Only used in the VS/NAT.
370 */
371struct ip_vs_seq {
372 __u32 init_seq; /* Add delta from this seq */
373 __u32 delta; /* Delta in sequence numbers */
374 __u32 previous_delta; /* Delta in sequence numbers
375 before last resized pkt */
376};
377
378
379/*
380 * IPVS statistics object
381 */
382struct ip_vs_stats
383{
384 __u32 conns; /* connections scheduled */
385 __u32 inpkts; /* incoming packets */
386 __u32 outpkts; /* outgoing packets */
387 __u64 inbytes; /* incoming bytes */
388 __u64 outbytes; /* outgoing bytes */
389
390 __u32 cps; /* current connection rate */
391 __u32 inpps; /* current in packet rate */
392 __u32 outpps; /* current out packet rate */
393 __u32 inbps; /* current in byte rate */
394 __u32 outbps; /* current out byte rate */
395
396 spinlock_t lock; /* spin lock */
397};
398
14c85021
ACM		 399struct dst_entry;
400struct iphdr;
1da177e4
LT		 401struct ip_vs_conn;
402struct ip_vs_app;
14c85021 403struct sk_buff;
1da177e4
LT		 404
405struct ip_vs_protocol {
406 struct ip_vs_protocol *next;
407 char *name;
408 __u16 protocol;
409 int dont_defrag;
410 atomic_t appcnt; /* counter of proto app incs */
411 int *timeout_table; /* protocol timeout table */
412
413 void (*init)(struct ip_vs_protocol *pp);
414
415 void (*exit)(struct ip_vs_protocol *pp);
416
417 int (*conn_schedule)(struct sk_buff *skb,
418 struct ip_vs_protocol *pp,
419 int *verdict, struct ip_vs_conn **cpp);
420
421 struct ip_vs_conn *
422 (*conn_in_get)(const struct sk_buff *skb,
423 struct ip_vs_protocol *pp,
424 const struct iphdr *iph,
425 unsigned int proto_off,
426 int inverse);
427
428 struct ip_vs_conn *
429 (*conn_out_get)(const struct sk_buff *skb,
430 struct ip_vs_protocol *pp,
431 const struct iphdr *iph,
432 unsigned int proto_off,
433 int inverse);
434
3db05fea 435 int (*snat_handler)(struct sk_buff *skb,
1da177e4
LT		 436 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
437
3db05fea 438 int (*dnat_handler)(struct sk_buff *skb,
1da177e4
LT		 439 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
440
441 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
442
443 const char *(*state_name)(int state);
444
445 int (*state_transition)(struct ip_vs_conn *cp, int direction,
446 const struct sk_buff *skb,
447 struct ip_vs_protocol *pp);
448
449 int (*register_app)(struct ip_vs_app *inc);
450
451 void (*unregister_app)(struct ip_vs_app *inc);
452
453 int (*app_conn_bind)(struct ip_vs_conn *cp);
454
455 void (*debug_packet)(struct ip_vs_protocol *pp,
456 const struct sk_buff *skb,
457 int offset,
458 const char *msg);
459
460 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
461
462 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
463};
464
465extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
466
467/*
468 * IP_VS structure allocated for each dynamically scheduled connection
469 */
470struct ip_vs_conn {
471 struct list_head c_list; /* hashed list heads */
472
473 /* Protocol, addresses and port numbers */
014d730d
AV		 474 __be32 caddr; /* client address */
475 __be32 vaddr; /* virtual address */
476 __be32 daddr; /* destination address */
477 __be16 cport;
478 __be16 vport;
479 __be16 dport;
1da177e4
LT		 480 __u16 protocol; /* Which protocol (TCP/UDP) */
481
482 /* counter and timer */
483 atomic_t refcnt; /* reference count */
484 struct timer_list timer; /* Expiration timer */
485 volatile unsigned long timeout; /* timeout */
486
487 /* Flags and state transition */
488 spinlock_t lock; /* lock for state transition */
489 volatile __u16 flags; /* status flags */
490 volatile __u16 state; /* state info */
efac5276
RB		 491 volatile __u16 old_state; /* old state, to be used for
492 * state transition triggerd
493 * synchronization
494 */
1da177e4
LT		 495
496 /* Control members */
497 struct ip_vs_conn *control; /* Master control connection */
498 atomic_t n_control; /* Number of controlled ones */
499 struct ip_vs_dest *dest; /* real server */
500 atomic_t in_pkts; /* incoming packet counter */
501
502 /* packet transmitter for different forwarding methods. If it
503 mangles the packet, it must return NF_DROP or better NF_STOLEN,
504 otherwise this must be changed to a sk_buff **.
505 */
506 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
507 struct ip_vs_protocol *pp);
508
509 /* Note: we can group the following members into a structure,
510 in order to save more space, and the following members are
511 only used in VS/NAT anyway */
512 struct ip_vs_app *app; /* bound ip_vs_app object */
513 void *app_data; /* Application private data */
514 struct ip_vs_seq in_seq; /* incoming seq. struct */
515 struct ip_vs_seq out_seq; /* outgoing seq. struct */
516};
517
518
519/*
520 * The information about the virtual service offered to the net
521 * and the forwarding entries
522 */
523struct ip_vs_service {
524 struct list_head s_list; /* for normal service table */
525 struct list_head f_list; /* for fwmark-based service table */
526 atomic_t refcnt; /* reference counter */
527 atomic_t usecnt; /* use counter */
528
529 __u16 protocol; /* which protocol (TCP/UDP) */
014d730d
AV		 530 __be32 addr; /* IP address for virtual service */
531 __be16 port; /* port number for the service */
1da177e4
LT		 532 __u32 fwmark; /* firewall mark of the service */
533 unsigned flags; /* service status flags */
534 unsigned timeout; /* persistent timeout in ticks */
014d730d 535 __be32 netmask; /* grouping granularity */
1da177e4
LT		 536
537 struct list_head destinations; /* real server d-linked list */
538 __u32 num_dests; /* number of servers */
539 struct ip_vs_stats stats; /* statistics for the service */
540 struct ip_vs_app *inc; /* bind conns to this app inc */
541
542 /* for scheduling */
543 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
544 rwlock_t sched_lock; /* lock sched_data */
545 void *sched_data; /* scheduler application data */
546};
547
548
549/*
550 * The real server destination forwarding entry
551 * with ip address, port number, and so on.
552 */
553struct ip_vs_dest {
554 struct list_head n_list; /* for the dests in the service */
555 struct list_head d_list; /* for table with all the dests */
556
014d730d
AV		 557 __be32 addr; /* IP address of the server */
558 __be16 port; /* port number of the server */
1da177e4
LT		 559 volatile unsigned flags; /* dest status flags */
560 atomic_t conn_flags; /* flags to copy to conn */
561 atomic_t weight; /* server weight */
562
563 atomic_t refcnt; /* reference counter */
564 struct ip_vs_stats stats; /* statistics */
565
566 /* connection counters and thresholds */
567 atomic_t activeconns; /* active connections */
568 atomic_t inactconns; /* inactive connections */
569 atomic_t persistconns; /* persistent connections */
570 __u32 u_threshold; /* upper threshold */
571 __u32 l_threshold; /* lower threshold */
572
573 /* for destination cache */
574 spinlock_t dst_lock; /* lock of dst_cache */
575 struct dst_entry *dst_cache; /* destination cache entry */
576 u32 dst_rtos; /* RT_TOS(tos) for dst */
577
578 /* for virtual service */
579 struct ip_vs_service *svc; /* service it belongs to */
580 __u16 protocol; /* which protocol (TCP/UDP) */
014d730d
AV		 581 __be32 vaddr; /* virtual IP address */
582 __be16 vport; /* virtual port number */
1da177e4
LT		 583 __u32 vfwmark; /* firewall mark of service */
584};
585
586
587/*
588 * The scheduler object
589 */
590struct ip_vs_scheduler {
591 struct list_head n_list; /* d-linked list head */
592 char *name; /* scheduler name */
593 atomic_t refcnt; /* reference counter */
594 struct module *module; /* THIS_MODULE/NULL */
595
596 /* scheduler initializing service */
597 int (*init_service)(struct ip_vs_service *svc);
598 /* scheduling service finish */
599 int (*done_service)(struct ip_vs_service *svc);
600 /* scheduler updating service */
601 int (*update_service)(struct ip_vs_service *svc);
602
603 /* selecting a server from the given service */
604 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
605 const struct sk_buff *skb);
606};
607
608
609/*
610 * The application module object (a.k.a. app incarnation)
611 */
612struct ip_vs_app
613{
614 struct list_head a_list; /* member in app list */
615 int type; /* IP_VS_APP_TYPE_xxx */
616 char *name; /* application module name */
617 __u16 protocol;
618 struct module *module; /* THIS_MODULE/NULL */
619 struct list_head incs_list; /* list of incarnations */
620
621 /* members for application incarnations */
622 struct list_head p_list; /* member in proto app list */
623 struct ip_vs_app *app; /* its real application */
014d730d 624 __be16 port; /* port number in net order */
1da177e4
LT		 625 atomic_t usecnt; /* usage counter */
626
627 /* output hook: return false if can't linearize. diff set for TCP. */
628 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
3db05fea 629 struct sk_buff *, int *diff);
1da177e4
LT		 630
631 /* input hook: return false if can't linearize. diff set for TCP. */
632 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
3db05fea 633 struct sk_buff *, int *diff);
1da177e4
LT		 634
635 /* ip_vs_app initializer */
636 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
637
638 /* ip_vs_app finish */
639 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
640
641
642 /* not used now */
643 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
644 struct ip_vs_protocol *);
645
646 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
647
648 int * timeout_table;
649 int * timeouts;
650 int timeouts_size;
651
652 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
653 int *verdict, struct ip_vs_conn **cpp);
654
655 struct ip_vs_conn *
656 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
657 const struct iphdr *iph, unsigned int proto_off,
658 int inverse);
659
660 struct ip_vs_conn *
661 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
662 const struct iphdr *iph, unsigned int proto_off,
663 int inverse);
664
665 int (*state_transition)(struct ip_vs_conn *cp, int direction,
666 const struct sk_buff *skb,
667 struct ip_vs_app *app);
668
669 void (*timeout_change)(struct ip_vs_app *app, int flags);
670};
671
672
673/*
674 * IPVS core functions
675 * (from ip_vs_core.c)
676 */
677extern const char *ip_vs_proto_name(unsigned proto);
678extern void ip_vs_init_hash_table(struct list_head *table, int rows);
679#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0]))
680
1da177e4
LT		 681#define IP_VS_APP_TYPE_FTP 1
682
683/*
684 * ip_vs_conn handling functions
685 * (from ip_vs_conn.c)
686 */
687
688/*
689 * IPVS connection entry hash table
690 */
691#ifndef CONFIG_IP_VS_TAB_BITS
692#define CONFIG_IP_VS_TAB_BITS 12
693#endif
694/* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
695#if CONFIG_IP_VS_TAB_BITS < 8
696#define IP_VS_CONN_TAB_BITS 8
697#endif
698#if CONFIG_IP_VS_TAB_BITS > 20
699#define IP_VS_CONN_TAB_BITS 20
700#endif
701#if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
702#define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
703#endif
704#define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
705#define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
706
707enum {
708 IP_VS_DIR_INPUT = 0,
709 IP_VS_DIR_OUTPUT,
710 IP_VS_DIR_INPUT_ONLY,
711 IP_VS_DIR_LAST,
712};
713
714extern struct ip_vs_conn *ip_vs_conn_in_get
014d730d 715(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
87375ab4 716extern struct ip_vs_conn *ip_vs_ct_in_get
014d730d 717(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
1da177e4 718extern struct ip_vs_conn *ip_vs_conn_out_get
014d730d 719(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
1da177e4
LT		 720
721/* put back the conn without restarting its timer */
722static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
723{
724 atomic_dec(&cp->refcnt);
725}
726extern void ip_vs_conn_put(struct ip_vs_conn *cp);
014d730d 727extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1da177e4
LT		 728
729extern struct ip_vs_conn *
014d730d
AV		 730ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport,
731 __be32 daddr, __be16 dport, unsigned flags,
1da177e4
LT		 732 struct ip_vs_dest *dest);
733extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
734
735extern const char * ip_vs_state_name(__u16 proto, int state);
736
737extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
738extern int ip_vs_check_template(struct ip_vs_conn *ct);
1da177e4
LT		 739extern void ip_vs_random_dropentry(void);
740extern int ip_vs_conn_init(void);
741extern void ip_vs_conn_cleanup(void);
742
743static inline void ip_vs_control_del(struct ip_vs_conn *cp)
744{
745 struct ip_vs_conn *ctl_cp = cp->control;
746 if (!ctl_cp) {
747 IP_VS_ERR("request control DEL for uncontrolled: "
748 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
749 NIPQUAD(cp->caddr),ntohs(cp->cport),
750 NIPQUAD(cp->vaddr),ntohs(cp->vport));
751 return;
752 }
753
754 IP_VS_DBG(7, "DELeting control for: "
755 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
756 NIPQUAD(cp->caddr),ntohs(cp->cport),
757 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
758
759 cp->control = NULL;
760 if (atomic_read(&ctl_cp->n_control) == 0) {
761 IP_VS_ERR("BUG control DEL with n=0 : "
762 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
763 NIPQUAD(cp->caddr),ntohs(cp->cport),
764 NIPQUAD(cp->vaddr),ntohs(cp->vport));
765 return;
766 }
767 atomic_dec(&ctl_cp->n_control);
768}
769
770static inline void
771ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
772{
773 if (cp->control) {
774 IP_VS_ERR("request control ADD for already controlled: "
775 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
776 NIPQUAD(cp->caddr),ntohs(cp->cport),
777 NIPQUAD(cp->vaddr),ntohs(cp->vport));
778 ip_vs_control_del(cp);
779 }
780
781 IP_VS_DBG(7, "ADDing control for: "
782 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
783 NIPQUAD(cp->caddr),ntohs(cp->cport),
784 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
785
786 cp->control = ctl_cp;
787 atomic_inc(&ctl_cp->n_control);
788}
789
790
791/*
792 * IPVS application functions
793 * (from ip_vs_app.c)
794 */
795#define IP_VS_APP_MAX_PORTS 8
796extern int register_ip_vs_app(struct ip_vs_app *app);
797extern void unregister_ip_vs_app(struct ip_vs_app *app);
798extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
799extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
800extern int
801register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
802extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
803extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
804
3db05fea
HX		 805extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
806extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
dd0fc66f 807extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
1da177e4
LT		 808 char *o_buf, int o_len, char *n_buf, int n_len);
809extern int ip_vs_app_init(void);
810extern void ip_vs_app_cleanup(void);
811
812
813/*
814 * IPVS protocol functions (from ip_vs_proto.c)
815 */
816extern int ip_vs_protocol_init(void);
817extern void ip_vs_protocol_cleanup(void);
818extern void ip_vs_protocol_timeout_change(int flags);
819extern int *ip_vs_create_timeout_table(int *table, int size);
820extern int
821ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
822extern void
823ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
824 int offset, const char *msg);
825
826extern struct ip_vs_protocol ip_vs_protocol_tcp;
827extern struct ip_vs_protocol ip_vs_protocol_udp;
828extern struct ip_vs_protocol ip_vs_protocol_icmp;
829extern struct ip_vs_protocol ip_vs_protocol_esp;
830extern struct ip_vs_protocol ip_vs_protocol_ah;
831
832
833/*
834 * Registering/unregistering scheduler functions
835 * (from ip_vs_sched.c)
836 */
837extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
838extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
839extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
840 struct ip_vs_scheduler *scheduler);
841extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
842extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
843extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
844extern struct ip_vs_conn *
845ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
846extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
847 struct ip_vs_protocol *pp);
848
849
850/*
851 * IPVS control data and functions (from ip_vs_ctl.c)
852 */
853extern int sysctl_ip_vs_cache_bypass;
854extern int sysctl_ip_vs_expire_nodest_conn;
855extern int sysctl_ip_vs_expire_quiescent_template;
856extern int sysctl_ip_vs_sync_threshold[2];
857extern int sysctl_ip_vs_nat_icmp_send;
858extern struct ip_vs_stats ip_vs_stats;
90754f8e 859extern struct ctl_path net_vs_ctl_path[];
1da177e4
LT		 860
861extern struct ip_vs_service *
014d730d 862ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
1da177e4
LT		 863
864static inline void ip_vs_service_put(struct ip_vs_service *svc)
865{
866 atomic_dec(&svc->usecnt);
867}
868
869extern struct ip_vs_dest *
014d730d 870ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport);
1da177e4
LT		 871extern int ip_vs_use_count_inc(void);
872extern void ip_vs_use_count_dec(void);
873extern int ip_vs_control_init(void);
874extern void ip_vs_control_cleanup(void);
1e356f9c
RB		 875extern struct ip_vs_dest *
876ip_vs_find_dest(__be32 daddr, __be16 dport,
877 __be32 vaddr, __be16 vport, __u16 protocol);
878extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1da177e4
LT		 879
880
881/*
882 * IPVS sync daemon data and function prototypes
883 * (from ip_vs_sync.c)
884 */
885extern volatile int ip_vs_sync_state;
886extern volatile int ip_vs_master_syncid;
887extern volatile int ip_vs_backup_syncid;
888extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
889extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
890extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
891extern int stop_sync_thread(int state);
892extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
893
894
895/*
896 * IPVS rate estimator prototypes (from ip_vs_est.c)
897 */
898extern int ip_vs_new_estimator(struct ip_vs_stats *stats);
899extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
900extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
901
902/*
903 * Various IPVS packet transmitters (from ip_vs_xmit.c)
904 */
905extern int ip_vs_null_xmit
906(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
907extern int ip_vs_bypass_xmit
908(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
909extern int ip_vs_nat_xmit
910(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
911extern int ip_vs_tunnel_xmit
912(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
913extern int ip_vs_dr_xmit
914(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
915extern int ip_vs_icmp_xmit
916(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
917extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
918
919
920/*
921 * This is a simple mechanism to ignore packets when
922 * we are loaded. Just set ip_vs_drop_rate to 'n' and
923 * we start to drop 1/rate of the packets
924 */
925extern int ip_vs_drop_rate;
926extern int ip_vs_drop_counter;
927
928static __inline__ int ip_vs_todrop(void)
929{
930 if (!ip_vs_drop_rate) return 0;
931 if (--ip_vs_drop_counter > 0) return 0;
932 ip_vs_drop_counter = ip_vs_drop_rate;
933 return 1;
934}
935
936/*
937 * ip_vs_fwd_tag returns the forwarding tag of the connection
938 */
939#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
940
732db659 941static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1da177e4
LT		 942{
943 char fwd;
944
945 switch (IP_VS_FWD_METHOD(cp)) {
946 case IP_VS_CONN_F_MASQ:
947 fwd = 'M'; break;
948 case IP_VS_CONN_F_LOCALNODE:
949 fwd = 'L'; break;
950 case IP_VS_CONN_F_TUNNEL:
951 fwd = 'T'; break;
952 case IP_VS_CONN_F_DROUTE:
953 fwd = 'R'; break;
954 case IP_VS_CONN_F_BYPASS:
955 fwd = 'B'; break;
956 default:
957 fwd = '?'; break;
958 }
959 return fwd;
960}
961
1da177e4
LT		 962extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
963 struct ip_vs_conn *cp, int dir);
964
b1550f22 965extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1da177e4 966
f9214b26 967static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1da177e4 968{
f9214b26 969 __be32 diff[2] = { ~old, new };
1da177e4 970
f9214b26
AV		 971 return csum_partial((char *) diff, sizeof(diff), oldsum);
972}
973
974static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
975{
976 __be16 diff[2] = { ~old, new };
977
978 return csum_partial((char *) diff, sizeof(diff), oldsum);
1da177e4
LT		 979}
980
981#endif /* __KERNEL__ */
982
983#endif /* _IP_VS_H */
Linux kernel - Deliverables
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