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[mirror_ubuntu-bionic-kernel.git] / include / net / ip_vs.h
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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;
2ad17def
JA		 408 u16 protocol;
409 u16 num_states;
1da177e4
LT		 410 int dont_defrag;
411 atomic_t appcnt; /* counter of proto app incs */
412 int *timeout_table; /* protocol timeout table */
413
414 void (*init)(struct ip_vs_protocol *pp);
415
416 void (*exit)(struct ip_vs_protocol *pp);
417
418 int (*conn_schedule)(struct sk_buff *skb,
419 struct ip_vs_protocol *pp,
420 int *verdict, struct ip_vs_conn **cpp);
421
422 struct ip_vs_conn *
423 (*conn_in_get)(const struct sk_buff *skb,
424 struct ip_vs_protocol *pp,
425 const struct iphdr *iph,
426 unsigned int proto_off,
427 int inverse);
428
429 struct ip_vs_conn *
430 (*conn_out_get)(const struct sk_buff *skb,
431 struct ip_vs_protocol *pp,
432 const struct iphdr *iph,
433 unsigned int proto_off,
434 int inverse);
435
3db05fea 436 int (*snat_handler)(struct sk_buff *skb,
1da177e4
LT		 437 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
438
3db05fea 439 int (*dnat_handler)(struct sk_buff *skb,
1da177e4
LT		 440 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
441
442 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
443
444 const char *(*state_name)(int state);
445
446 int (*state_transition)(struct ip_vs_conn *cp, int direction,
447 const struct sk_buff *skb,
448 struct ip_vs_protocol *pp);
449
450 int (*register_app)(struct ip_vs_app *inc);
451
452 void (*unregister_app)(struct ip_vs_app *inc);
453
454 int (*app_conn_bind)(struct ip_vs_conn *cp);
455
456 void (*debug_packet)(struct ip_vs_protocol *pp,
457 const struct sk_buff *skb,
458 int offset,
459 const char *msg);
460
461 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
462
463 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
464};
465
466extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
467
468/*
469 * IP_VS structure allocated for each dynamically scheduled connection
470 */
471struct ip_vs_conn {
472 struct list_head c_list; /* hashed list heads */
473
474 /* Protocol, addresses and port numbers */
014d730d
AV		 475 __be32 caddr; /* client address */
476 __be32 vaddr; /* virtual address */
477 __be32 daddr; /* destination address */
478 __be16 cport;
479 __be16 vport;
480 __be16 dport;
1da177e4
LT		 481 __u16 protocol; /* Which protocol (TCP/UDP) */
482
483 /* counter and timer */
484 atomic_t refcnt; /* reference count */
485 struct timer_list timer; /* Expiration timer */
486 volatile unsigned long timeout; /* timeout */
487
488 /* Flags and state transition */
489 spinlock_t lock; /* lock for state transition */
490 volatile __u16 flags; /* status flags */
491 volatile __u16 state; /* state info */
efac5276
RB		 492 volatile __u16 old_state; /* old state, to be used for
493 * state transition triggerd
494 * synchronization
495 */
1da177e4
LT		 496
497 /* Control members */
498 struct ip_vs_conn *control; /* Master control connection */
499 atomic_t n_control; /* Number of controlled ones */
500 struct ip_vs_dest *dest; /* real server */
501 atomic_t in_pkts; /* incoming packet counter */
502
503 /* packet transmitter for different forwarding methods. If it
504 mangles the packet, it must return NF_DROP or better NF_STOLEN,
505 otherwise this must be changed to a sk_buff **.
506 */
507 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
508 struct ip_vs_protocol *pp);
509
510 /* Note: we can group the following members into a structure,
511 in order to save more space, and the following members are
512 only used in VS/NAT anyway */
513 struct ip_vs_app *app; /* bound ip_vs_app object */
514 void *app_data; /* Application private data */
515 struct ip_vs_seq in_seq; /* incoming seq. struct */
516 struct ip_vs_seq out_seq; /* outgoing seq. struct */
517};
518
519
520/*
521 * The information about the virtual service offered to the net
522 * and the forwarding entries
523 */
524struct ip_vs_service {
525 struct list_head s_list; /* for normal service table */
526 struct list_head f_list; /* for fwmark-based service table */
527 atomic_t refcnt; /* reference counter */
528 atomic_t usecnt; /* use counter */
529
530 __u16 protocol; /* which protocol (TCP/UDP) */
014d730d
AV		 531 __be32 addr; /* IP address for virtual service */
532 __be16 port; /* port number for the service */
1da177e4
LT		 533 __u32 fwmark; /* firewall mark of the service */
534 unsigned flags; /* service status flags */
535 unsigned timeout; /* persistent timeout in ticks */
014d730d 536 __be32 netmask; /* grouping granularity */
1da177e4
LT		 537
538 struct list_head destinations; /* real server d-linked list */
539 __u32 num_dests; /* number of servers */
540 struct ip_vs_stats stats; /* statistics for the service */
541 struct ip_vs_app *inc; /* bind conns to this app inc */
542
543 /* for scheduling */
544 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
545 rwlock_t sched_lock; /* lock sched_data */
546 void *sched_data; /* scheduler application data */
547};
548
549
550/*
551 * The real server destination forwarding entry
552 * with ip address, port number, and so on.
553 */
554struct ip_vs_dest {
555 struct list_head n_list; /* for the dests in the service */
556 struct list_head d_list; /* for table with all the dests */
557
014d730d
AV		 558 __be32 addr; /* IP address of the server */
559 __be16 port; /* port number of the server */
1da177e4
LT		 560 volatile unsigned flags; /* dest status flags */
561 atomic_t conn_flags; /* flags to copy to conn */
562 atomic_t weight; /* server weight */
563
564 atomic_t refcnt; /* reference counter */
565 struct ip_vs_stats stats; /* statistics */
566
567 /* connection counters and thresholds */
568 atomic_t activeconns; /* active connections */
569 atomic_t inactconns; /* inactive connections */
570 atomic_t persistconns; /* persistent connections */
571 __u32 u_threshold; /* upper threshold */
572 __u32 l_threshold; /* lower threshold */
573
574 /* for destination cache */
575 spinlock_t dst_lock; /* lock of dst_cache */
576 struct dst_entry *dst_cache; /* destination cache entry */
577 u32 dst_rtos; /* RT_TOS(tos) for dst */
578
579 /* for virtual service */
580 struct ip_vs_service *svc; /* service it belongs to */
581 __u16 protocol; /* which protocol (TCP/UDP) */
014d730d
AV		 582 __be32 vaddr; /* virtual IP address */
583 __be16 vport; /* virtual port number */
1da177e4
LT		 584 __u32 vfwmark; /* firewall mark of service */
585};
586
587
588/*
589 * The scheduler object
590 */
591struct ip_vs_scheduler {
592 struct list_head n_list; /* d-linked list head */
593 char *name; /* scheduler name */
594 atomic_t refcnt; /* reference counter */
595 struct module *module; /* THIS_MODULE/NULL */
596
597 /* scheduler initializing service */
598 int (*init_service)(struct ip_vs_service *svc);
599 /* scheduling service finish */
600 int (*done_service)(struct ip_vs_service *svc);
601 /* scheduler updating service */
602 int (*update_service)(struct ip_vs_service *svc);
603
604 /* selecting a server from the given service */
605 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
606 const struct sk_buff *skb);
607};
608
609
610/*
611 * The application module object (a.k.a. app incarnation)
612 */
613struct ip_vs_app
614{
615 struct list_head a_list; /* member in app list */
616 int type; /* IP_VS_APP_TYPE_xxx */
617 char *name; /* application module name */
618 __u16 protocol;
619 struct module *module; /* THIS_MODULE/NULL */
620 struct list_head incs_list; /* list of incarnations */
621
622 /* members for application incarnations */
623 struct list_head p_list; /* member in proto app list */
624 struct ip_vs_app *app; /* its real application */
014d730d 625 __be16 port; /* port number in net order */
1da177e4
LT		 626 atomic_t usecnt; /* usage counter */
627
628 /* output hook: return false if can't linearize. diff set for TCP. */
629 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
3db05fea 630 struct sk_buff *, int *diff);
1da177e4
LT		 631
632 /* input hook: return false if can't linearize. diff set for TCP. */
633 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
3db05fea 634 struct sk_buff *, int *diff);
1da177e4
LT		 635
636 /* ip_vs_app initializer */
637 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
638
639 /* ip_vs_app finish */
640 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
641
642
643 /* not used now */
644 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
645 struct ip_vs_protocol *);
646
647 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
648
649 int * timeout_table;
650 int * timeouts;
651 int timeouts_size;
652
653 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
654 int *verdict, struct ip_vs_conn **cpp);
655
656 struct ip_vs_conn *
657 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
658 const struct iphdr *iph, unsigned int proto_off,
659 int inverse);
660
661 struct ip_vs_conn *
662 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
663 const struct iphdr *iph, unsigned int proto_off,
664 int inverse);
665
666 int (*state_transition)(struct ip_vs_conn *cp, int direction,
667 const struct sk_buff *skb,
668 struct ip_vs_app *app);
669
670 void (*timeout_change)(struct ip_vs_app *app, int flags);
671};
672
673
674/*
675 * IPVS core functions
676 * (from ip_vs_core.c)
677 */
678extern const char *ip_vs_proto_name(unsigned proto);
679extern void ip_vs_init_hash_table(struct list_head *table, int rows);
680#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0]))
681
1da177e4
LT		 682#define IP_VS_APP_TYPE_FTP 1
683
684/*
685 * ip_vs_conn handling functions
686 * (from ip_vs_conn.c)
687 */
688
689/*
690 * IPVS connection entry hash table
691 */
692#ifndef CONFIG_IP_VS_TAB_BITS
693#define CONFIG_IP_VS_TAB_BITS 12
694#endif
695/* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
696#if CONFIG_IP_VS_TAB_BITS < 8
697#define IP_VS_CONN_TAB_BITS 8
698#endif
699#if CONFIG_IP_VS_TAB_BITS > 20
700#define IP_VS_CONN_TAB_BITS 20
701#endif
702#if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
703#define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
704#endif
705#define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
706#define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
707
708enum {
709 IP_VS_DIR_INPUT = 0,
710 IP_VS_DIR_OUTPUT,
711 IP_VS_DIR_INPUT_ONLY,
712 IP_VS_DIR_LAST,
713};
714
715extern struct ip_vs_conn *ip_vs_conn_in_get
014d730d 716(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
87375ab4 717extern struct ip_vs_conn *ip_vs_ct_in_get
014d730d 718(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
1da177e4 719extern struct ip_vs_conn *ip_vs_conn_out_get
014d730d 720(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
1da177e4
LT		 721
722/* put back the conn without restarting its timer */
723static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
724{
725 atomic_dec(&cp->refcnt);
726}
727extern void ip_vs_conn_put(struct ip_vs_conn *cp);
014d730d 728extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1da177e4
LT		 729
730extern struct ip_vs_conn *
014d730d
AV		 731ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport,
732 __be32 daddr, __be16 dport, unsigned flags,
1da177e4
LT		 733 struct ip_vs_dest *dest);
734extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
735
736extern const char * ip_vs_state_name(__u16 proto, int state);
737
738extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
739extern int ip_vs_check_template(struct ip_vs_conn *ct);
1da177e4
LT		 740extern void ip_vs_random_dropentry(void);
741extern int ip_vs_conn_init(void);
742extern void ip_vs_conn_cleanup(void);
743
744static inline void ip_vs_control_del(struct ip_vs_conn *cp)
745{
746 struct ip_vs_conn *ctl_cp = cp->control;
747 if (!ctl_cp) {
748 IP_VS_ERR("request control DEL for uncontrolled: "
749 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
750 NIPQUAD(cp->caddr),ntohs(cp->cport),
751 NIPQUAD(cp->vaddr),ntohs(cp->vport));
752 return;
753 }
754
755 IP_VS_DBG(7, "DELeting control for: "
756 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
757 NIPQUAD(cp->caddr),ntohs(cp->cport),
758 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
759
760 cp->control = NULL;
761 if (atomic_read(&ctl_cp->n_control) == 0) {
762 IP_VS_ERR("BUG control DEL with n=0 : "
763 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
764 NIPQUAD(cp->caddr),ntohs(cp->cport),
765 NIPQUAD(cp->vaddr),ntohs(cp->vport));
766 return;
767 }
768 atomic_dec(&ctl_cp->n_control);
769}
770
771static inline void
772ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
773{
774 if (cp->control) {
775 IP_VS_ERR("request control ADD for already controlled: "
776 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
777 NIPQUAD(cp->caddr),ntohs(cp->cport),
778 NIPQUAD(cp->vaddr),ntohs(cp->vport));
779 ip_vs_control_del(cp);
780 }
781
782 IP_VS_DBG(7, "ADDing control for: "
783 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
784 NIPQUAD(cp->caddr),ntohs(cp->cport),
785 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
786
787 cp->control = ctl_cp;
788 atomic_inc(&ctl_cp->n_control);
789}
790
791
792/*
793 * IPVS application functions
794 * (from ip_vs_app.c)
795 */
796#define IP_VS_APP_MAX_PORTS 8
797extern int register_ip_vs_app(struct ip_vs_app *app);
798extern void unregister_ip_vs_app(struct ip_vs_app *app);
799extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
800extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
801extern int
802register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
803extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
804extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
805
3db05fea
HX		 806extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
807extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
dd0fc66f 808extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
1da177e4
LT		 809 char *o_buf, int o_len, char *n_buf, int n_len);
810extern int ip_vs_app_init(void);
811extern void ip_vs_app_cleanup(void);
812
813
814/*
815 * IPVS protocol functions (from ip_vs_proto.c)
816 */
817extern int ip_vs_protocol_init(void);
818extern void ip_vs_protocol_cleanup(void);
819extern void ip_vs_protocol_timeout_change(int flags);
820extern int *ip_vs_create_timeout_table(int *table, int size);
821extern int
822ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
823extern void
824ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
825 int offset, const char *msg);
826
827extern struct ip_vs_protocol ip_vs_protocol_tcp;
828extern struct ip_vs_protocol ip_vs_protocol_udp;
829extern struct ip_vs_protocol ip_vs_protocol_icmp;
830extern struct ip_vs_protocol ip_vs_protocol_esp;
831extern struct ip_vs_protocol ip_vs_protocol_ah;
832
833
834/*
835 * Registering/unregistering scheduler functions
836 * (from ip_vs_sched.c)
837 */
838extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
839extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
840extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
841 struct ip_vs_scheduler *scheduler);
842extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
843extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
844extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
845extern struct ip_vs_conn *
846ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
847extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
848 struct ip_vs_protocol *pp);
849
850
851/*
852 * IPVS control data and functions (from ip_vs_ctl.c)
853 */
854extern int sysctl_ip_vs_cache_bypass;
855extern int sysctl_ip_vs_expire_nodest_conn;
856extern int sysctl_ip_vs_expire_quiescent_template;
857extern int sysctl_ip_vs_sync_threshold[2];
858extern int sysctl_ip_vs_nat_icmp_send;
859extern struct ip_vs_stats ip_vs_stats;
90754f8e 860extern struct ctl_path net_vs_ctl_path[];
1da177e4
LT		 861
862extern struct ip_vs_service *
014d730d 863ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
1da177e4
LT		 864
865static inline void ip_vs_service_put(struct ip_vs_service *svc)
866{
867 atomic_dec(&svc->usecnt);
868}
869
870extern struct ip_vs_dest *
014d730d 871ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport);
1da177e4
LT		 872extern int ip_vs_use_count_inc(void);
873extern void ip_vs_use_count_dec(void);
874extern int ip_vs_control_init(void);
875extern void ip_vs_control_cleanup(void);
1e356f9c
RB		 876extern struct ip_vs_dest *
877ip_vs_find_dest(__be32 daddr, __be16 dport,
878 __be32 vaddr, __be16 vport, __u16 protocol);
879extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1da177e4
LT		 880
881
882/*
883 * IPVS sync daemon data and function prototypes
884 * (from ip_vs_sync.c)
885 */
886extern volatile int ip_vs_sync_state;
887extern volatile int ip_vs_master_syncid;
888extern volatile int ip_vs_backup_syncid;
889extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
890extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
891extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
892extern int stop_sync_thread(int state);
893extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
894
895
896/*
897 * IPVS rate estimator prototypes (from ip_vs_est.c)
898 */
899extern int ip_vs_new_estimator(struct ip_vs_stats *stats);
900extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
901extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
902
903/*
904 * Various IPVS packet transmitters (from ip_vs_xmit.c)
905 */
906extern int ip_vs_null_xmit
907(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
908extern int ip_vs_bypass_xmit
909(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
910extern int ip_vs_nat_xmit
911(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
912extern int ip_vs_tunnel_xmit
913(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
914extern int ip_vs_dr_xmit
915(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
916extern int ip_vs_icmp_xmit
917(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
918extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
919
920
921/*
922 * This is a simple mechanism to ignore packets when
923 * we are loaded. Just set ip_vs_drop_rate to 'n' and
924 * we start to drop 1/rate of the packets
925 */
926extern int ip_vs_drop_rate;
927extern int ip_vs_drop_counter;
928
929static __inline__ int ip_vs_todrop(void)
930{
931 if (!ip_vs_drop_rate) return 0;
932 if (--ip_vs_drop_counter > 0) return 0;
933 ip_vs_drop_counter = ip_vs_drop_rate;
934 return 1;
935}
936
937/*
938 * ip_vs_fwd_tag returns the forwarding tag of the connection
939 */
940#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
941
732db659 942static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1da177e4
LT		 943{
944 char fwd;
945
946 switch (IP_VS_FWD_METHOD(cp)) {
947 case IP_VS_CONN_F_MASQ:
948 fwd = 'M'; break;
949 case IP_VS_CONN_F_LOCALNODE:
950 fwd = 'L'; break;
951 case IP_VS_CONN_F_TUNNEL:
952 fwd = 'T'; break;
953 case IP_VS_CONN_F_DROUTE:
954 fwd = 'R'; break;
955 case IP_VS_CONN_F_BYPASS:
956 fwd = 'B'; break;
957 default:
958 fwd = '?'; break;
959 }
960 return fwd;
961}
962
1da177e4
LT		 963extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
964 struct ip_vs_conn *cp, int dir);
965
b1550f22 966extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1da177e4 967
f9214b26 968static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1da177e4 969{
f9214b26 970 __be32 diff[2] = { ~old, new };
1da177e4 971
f9214b26
AV		 972 return csum_partial((char *) diff, sizeof(diff), oldsum);
973}
974
975static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
976{
977 __be16 diff[2] = { ~old, new };
978
979 return csum_partial((char *) diff, sizeof(diff), oldsum);
1da177e4
LT		 980}
981
982#endif /* __KERNEL__ */
983
984#endif /* _IP_VS_H */
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