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IPVS: Add general v4/v6 helper functions / data structures
[deliverable/linux.git] / include / net / ip_vs.h
CommitLineData
1da177e4
LT		 1/*
2 * IP Virtual Server
3 * data structure and functionality definitions
4 */
5
bc4768eb
JV		 6#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
1da177e4 8
bc4768eb 9#include <linux/ip_vs.h> /* definitions shared with userland */
1da177e4 10
bc4768eb 11/* old ipvsadm versions still include this file directly */
1da177e4
LT		 12#ifdef __KERNEL__
13
bc4768eb
JV		 14#include <asm/types.h> /* for __uXX types */
15
16#include <linux/sysctl.h> /* for ctl_path */
1da177e4
LT		 17#include <linux/list.h> /* for struct list_head */
18#include <linux/spinlock.h> /* for struct rwlock_t */
1da177e4 19#include <asm/atomic.h> /* for struct atomic_t */
1da177e4 20#include <linux/compiler.h>
14c85021 21#include <linux/timer.h>
1da177e4 22
14c85021 23#include <net/checksum.h>
e7ade46a
JV		 24#include <linux/netfilter.h> /* for union nf_inet_addr */
25#include <linux/ipv6.h> /* for struct ipv6hdr */
26#include <net/ipv6.h> /* for ipv6_addr_copy */
1da177e4 27
64aae3cb
JV		 28struct ip_vs_iphdr {
29 int len;
30 __u8 protocol;
31 union nf_inet_addr saddr;
32 union nf_inet_addr daddr;
33};
34
35static inline void
36ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
37{
38#ifdef CONFIG_IP_VS_IPV6
39 if (af == AF_INET6) {
40 const struct ipv6hdr *iph = nh;
41 iphdr->len = sizeof(struct ipv6hdr);
42 iphdr->protocol = iph->nexthdr;
43 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
44 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
45 } else
46#endif
47 {
48 const struct iphdr *iph = nh;
49 iphdr->len = iph->ihl * 4;
50 iphdr->protocol = iph->protocol;
51 iphdr->saddr.ip = iph->saddr;
52 iphdr->daddr.ip = iph->daddr;
53 }
54}
55
56static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
57 const union nf_inet_addr *src)
58{
59#ifdef CONFIG_IP_VS_IPV6
60 if (af == AF_INET6)
61 ipv6_addr_copy(&dst->in6, &src->in6);
62 else
63#endif
64 dst->ip = src->ip;
65}
66
67static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
68 const union nf_inet_addr *b)
69{
70#ifdef CONFIG_IP_VS_IPV6
71 if (af == AF_INET6)
72 return ipv6_addr_equal(&a->in6, &b->in6);
73#endif
74 return a->ip == b->ip;
75}
76
1da177e4 77#ifdef CONFIG_IP_VS_DEBUG
14c85021
ACM		 78#include <linux/net.h>
79
1da177e4
LT		 80extern int ip_vs_get_debug_level(void);
81#define IP_VS_DBG(level, msg...) \
82 do { \
83 if (level <= ip_vs_get_debug_level()) \
84 printk(KERN_DEBUG "IPVS: " msg); \
85 } while (0)
86#define IP_VS_DBG_RL(msg...) \
87 do { \
88 if (net_ratelimit()) \
89 printk(KERN_DEBUG "IPVS: " msg); \
90 } while (0)
91#define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
92 do { \
93 if (level <= ip_vs_get_debug_level()) \
94 pp->debug_packet(pp, skb, ofs, msg); \
95 } while (0)
96#define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
97 do { \
98 if (level <= ip_vs_get_debug_level() && \
99 net_ratelimit()) \
100 pp->debug_packet(pp, skb, ofs, msg); \
101 } while (0)
102#else /* NO DEBUGGING at ALL */
103#define IP_VS_DBG(level, msg...) do {} while (0)
104#define IP_VS_DBG_RL(msg...) do {} while (0)
105#define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0)
106#define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0)
107#endif
108
109#define IP_VS_BUG() BUG()
110#define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
111#define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
112#define IP_VS_WARNING(msg...) \
113 printk(KERN_WARNING "IPVS: " msg)
114#define IP_VS_ERR_RL(msg...) \
115 do { \
116 if (net_ratelimit()) \
117 printk(KERN_ERR "IPVS: " msg); \
118 } while (0)
119
120#ifdef CONFIG_IP_VS_DEBUG
121#define EnterFunction(level) \
122 do { \
123 if (level <= ip_vs_get_debug_level()) \
124 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \
125 __FUNCTION__, __FILE__, __LINE__); \
126 } while (0)
127#define LeaveFunction(level) \
128 do { \
129 if (level <= ip_vs_get_debug_level()) \
130 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \
131 __FUNCTION__, __FILE__, __LINE__); \
132 } while (0)
133#else
134#define EnterFunction(level) do {} while (0)
135#define LeaveFunction(level) do {} while (0)
136#endif
137
138#define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
139
140
141/*
142 * The port number of FTP service (in network order).
143 */
144#define FTPPORT __constant_htons(21)
145#define FTPDATA __constant_htons(20)
146
1da177e4
LT		 147/*
148 * TCP State Values
149 */
150enum {
151 IP_VS_TCP_S_NONE = 0,
152 IP_VS_TCP_S_ESTABLISHED,
153 IP_VS_TCP_S_SYN_SENT,
154 IP_VS_TCP_S_SYN_RECV,
155 IP_VS_TCP_S_FIN_WAIT,
156 IP_VS_TCP_S_TIME_WAIT,
157 IP_VS_TCP_S_CLOSE,
158 IP_VS_TCP_S_CLOSE_WAIT,
159 IP_VS_TCP_S_LAST_ACK,
160 IP_VS_TCP_S_LISTEN,
161 IP_VS_TCP_S_SYNACK,
162 IP_VS_TCP_S_LAST
163};
164
165/*
166 * UDP State Values
167 */
168enum {
169 IP_VS_UDP_S_NORMAL,
170 IP_VS_UDP_S_LAST,
171};
172
173/*
174 * ICMP State Values
175 */
176enum {
177 IP_VS_ICMP_S_NORMAL,
178 IP_VS_ICMP_S_LAST,
179};
180
181/*
182 * Delta sequence info structure
183 * Each ip_vs_conn has 2 (output AND input seq. changes).
184 * Only used in the VS/NAT.
185 */
186struct ip_vs_seq {
187 __u32 init_seq; /* Add delta from this seq */
188 __u32 delta; /* Delta in sequence numbers */
189 __u32 previous_delta; /* Delta in sequence numbers
190 before last resized pkt */
191};
192
193
194/*
3a14a313 195 * IPVS statistics objects
1da177e4 196 */
3a14a313
SW		 197struct ip_vs_estimator {
198 struct list_head list;
199
200 u64 last_inbytes;
201 u64 last_outbytes;
202 u32 last_conns;
203 u32 last_inpkts;
204 u32 last_outpkts;
205
206 u32 cps;
207 u32 inpps;
208 u32 outpps;
209 u32 inbps;
210 u32 outbps;
211};
212
1da177e4
LT		 213struct ip_vs_stats
214{
215 __u32 conns; /* connections scheduled */
216 __u32 inpkts; /* incoming packets */
217 __u32 outpkts; /* outgoing packets */
218 __u64 inbytes; /* incoming bytes */
219 __u64 outbytes; /* outgoing bytes */
220
221 __u32 cps; /* current connection rate */
222 __u32 inpps; /* current in packet rate */
223 __u32 outpps; /* current out packet rate */
224 __u32 inbps; /* current in byte rate */
225 __u32 outbps; /* current out byte rate */
226
3a14a313
SW		 227 /*
228 * Don't add anything before the lock, because we use memcpy() to copy
229 * the members before the lock to struct ip_vs_stats_user in
230 * ip_vs_ctl.c.
231 */
232
1da177e4 233 spinlock_t lock; /* spin lock */
3a14a313
SW		 234
235 struct ip_vs_estimator est; /* estimator */
1da177e4
LT		 236};
237
14c85021
ACM		 238struct dst_entry;
239struct iphdr;
1da177e4
LT		 240struct ip_vs_conn;
241struct ip_vs_app;
14c85021 242struct sk_buff;
1da177e4
LT		 243
244struct ip_vs_protocol {
245 struct ip_vs_protocol *next;
246 char *name;
2ad17def
JA		 247 u16 protocol;
248 u16 num_states;
1da177e4
LT		 249 int dont_defrag;
250 atomic_t appcnt; /* counter of proto app incs */
251 int *timeout_table; /* protocol timeout table */
252
253 void (*init)(struct ip_vs_protocol *pp);
254
255 void (*exit)(struct ip_vs_protocol *pp);
256
257 int (*conn_schedule)(struct sk_buff *skb,
258 struct ip_vs_protocol *pp,
259 int *verdict, struct ip_vs_conn **cpp);
260
261 struct ip_vs_conn *
262 (*conn_in_get)(const struct sk_buff *skb,
263 struct ip_vs_protocol *pp,
264 const struct iphdr *iph,
265 unsigned int proto_off,
266 int inverse);
267
268 struct ip_vs_conn *
269 (*conn_out_get)(const struct sk_buff *skb,
270 struct ip_vs_protocol *pp,
271 const struct iphdr *iph,
272 unsigned int proto_off,
273 int inverse);
274
3db05fea 275 int (*snat_handler)(struct sk_buff *skb,
1da177e4
LT		 276 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
277
3db05fea 278 int (*dnat_handler)(struct sk_buff *skb,
1da177e4
LT		 279 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
280
281 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
282
283 const char *(*state_name)(int state);
284
285 int (*state_transition)(struct ip_vs_conn *cp, int direction,
286 const struct sk_buff *skb,
287 struct ip_vs_protocol *pp);
288
289 int (*register_app)(struct ip_vs_app *inc);
290
291 void (*unregister_app)(struct ip_vs_app *inc);
292
293 int (*app_conn_bind)(struct ip_vs_conn *cp);
294
295 void (*debug_packet)(struct ip_vs_protocol *pp,
296 const struct sk_buff *skb,
297 int offset,
298 const char *msg);
299
300 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
301
302 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
303};
304
305extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
306
307/*
308 * IP_VS structure allocated for each dynamically scheduled connection
309 */
310struct ip_vs_conn {
311 struct list_head c_list; /* hashed list heads */
312
313 /* Protocol, addresses and port numbers */
e7ade46a
JV		 314 u16 af; /* address family */
315 union nf_inet_addr caddr; /* client address */
316 union nf_inet_addr vaddr; /* virtual address */
317 union nf_inet_addr daddr; /* destination address */
014d730d
AV		 318 __be16 cport;
319 __be16 vport;
320 __be16 dport;
1da177e4
LT		 321 __u16 protocol; /* Which protocol (TCP/UDP) */
322
323 /* counter and timer */
324 atomic_t refcnt; /* reference count */
325 struct timer_list timer; /* Expiration timer */
326 volatile unsigned long timeout; /* timeout */
327
328 /* Flags and state transition */
329 spinlock_t lock; /* lock for state transition */
330 volatile __u16 flags; /* status flags */
331 volatile __u16 state; /* state info */
efac5276
RB		 332 volatile __u16 old_state; /* old state, to be used for
333 * state transition triggerd
334 * synchronization
335 */
1da177e4
LT		 336
337 /* Control members */
338 struct ip_vs_conn *control; /* Master control connection */
339 atomic_t n_control; /* Number of controlled ones */
340 struct ip_vs_dest *dest; /* real server */
341 atomic_t in_pkts; /* incoming packet counter */
342
343 /* packet transmitter for different forwarding methods. If it
344 mangles the packet, it must return NF_DROP or better NF_STOLEN,
345 otherwise this must be changed to a sk_buff **.
346 */
347 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
348 struct ip_vs_protocol *pp);
349
350 /* Note: we can group the following members into a structure,
351 in order to save more space, and the following members are
352 only used in VS/NAT anyway */
353 struct ip_vs_app *app; /* bound ip_vs_app object */
354 void *app_data; /* Application private data */
355 struct ip_vs_seq in_seq; /* incoming seq. struct */
356 struct ip_vs_seq out_seq; /* outgoing seq. struct */
357};
358
359
360/*
361 * The information about the virtual service offered to the net
362 * and the forwarding entries
363 */
364struct ip_vs_service {
365 struct list_head s_list; /* for normal service table */
366 struct list_head f_list; /* for fwmark-based service table */
367 atomic_t refcnt; /* reference counter */
368 atomic_t usecnt; /* use counter */
369
e7ade46a 370 u16 af; /* address family */
1da177e4 371 __u16 protocol; /* which protocol (TCP/UDP) */
e7ade46a 372 union nf_inet_addr addr; /* IP address for virtual service */
014d730d 373 __be16 port; /* port number for the service */
1da177e4
LT		 374 __u32 fwmark; /* firewall mark of the service */
375 unsigned flags; /* service status flags */
376 unsigned timeout; /* persistent timeout in ticks */
014d730d 377 __be32 netmask; /* grouping granularity */
1da177e4
LT		 378
379 struct list_head destinations; /* real server d-linked list */
380 __u32 num_dests; /* number of servers */
381 struct ip_vs_stats stats; /* statistics for the service */
382 struct ip_vs_app *inc; /* bind conns to this app inc */
383
384 /* for scheduling */
385 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
386 rwlock_t sched_lock; /* lock sched_data */
387 void *sched_data; /* scheduler application data */
388};
389
390
391/*
392 * The real server destination forwarding entry
393 * with ip address, port number, and so on.
394 */
395struct ip_vs_dest {
396 struct list_head n_list; /* for the dests in the service */
397 struct list_head d_list; /* for table with all the dests */
398
e7ade46a
JV		 399 u16 af; /* address family */
400 union nf_inet_addr addr; /* IP address of the server */
014d730d 401 __be16 port; /* port number of the server */
1da177e4
LT		 402 volatile unsigned flags; /* dest status flags */
403 atomic_t conn_flags; /* flags to copy to conn */
404 atomic_t weight; /* server weight */
405
406 atomic_t refcnt; /* reference counter */
407 struct ip_vs_stats stats; /* statistics */
408
409 /* connection counters and thresholds */
410 atomic_t activeconns; /* active connections */
411 atomic_t inactconns; /* inactive connections */
412 atomic_t persistconns; /* persistent connections */
413 __u32 u_threshold; /* upper threshold */
414 __u32 l_threshold; /* lower threshold */
415
416 /* for destination cache */
417 spinlock_t dst_lock; /* lock of dst_cache */
418 struct dst_entry *dst_cache; /* destination cache entry */
419 u32 dst_rtos; /* RT_TOS(tos) for dst */
420
421 /* for virtual service */
422 struct ip_vs_service *svc; /* service it belongs to */
423 __u16 protocol; /* which protocol (TCP/UDP) */
e7ade46a 424 union nf_inet_addr vaddr; /* virtual IP address */
014d730d 425 __be16 vport; /* virtual port number */
1da177e4
LT		 426 __u32 vfwmark; /* firewall mark of service */
427};
428
429
430/*
431 * The scheduler object
432 */
433struct ip_vs_scheduler {
434 struct list_head n_list; /* d-linked list head */
435 char *name; /* scheduler name */
436 atomic_t refcnt; /* reference counter */
437 struct module *module; /* THIS_MODULE/NULL */
438
439 /* scheduler initializing service */
440 int (*init_service)(struct ip_vs_service *svc);
441 /* scheduling service finish */
442 int (*done_service)(struct ip_vs_service *svc);
443 /* scheduler updating service */
444 int (*update_service)(struct ip_vs_service *svc);
445
446 /* selecting a server from the given service */
447 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
448 const struct sk_buff *skb);
449};
450
451
452/*
453 * The application module object (a.k.a. app incarnation)
454 */
455struct ip_vs_app
456{
457 struct list_head a_list; /* member in app list */
458 int type; /* IP_VS_APP_TYPE_xxx */
459 char *name; /* application module name */
460 __u16 protocol;
461 struct module *module; /* THIS_MODULE/NULL */
462 struct list_head incs_list; /* list of incarnations */
463
464 /* members for application incarnations */
465 struct list_head p_list; /* member in proto app list */
466 struct ip_vs_app *app; /* its real application */
014d730d 467 __be16 port; /* port number in net order */
1da177e4
LT		 468 atomic_t usecnt; /* usage counter */
469
470 /* output hook: return false if can't linearize. diff set for TCP. */
471 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
3db05fea 472 struct sk_buff *, int *diff);
1da177e4
LT		 473
474 /* input hook: return false if can't linearize. diff set for TCP. */
475 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
3db05fea 476 struct sk_buff *, int *diff);
1da177e4
LT		 477
478 /* ip_vs_app initializer */
479 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
480
481 /* ip_vs_app finish */
482 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
483
484
485 /* not used now */
486 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
487 struct ip_vs_protocol *);
488
489 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
490
491 int * timeout_table;
492 int * timeouts;
493 int timeouts_size;
494
495 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
496 int *verdict, struct ip_vs_conn **cpp);
497
498 struct ip_vs_conn *
499 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
500 const struct iphdr *iph, unsigned int proto_off,
501 int inverse);
502
503 struct ip_vs_conn *
504 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
505 const struct iphdr *iph, unsigned int proto_off,
506 int inverse);
507
508 int (*state_transition)(struct ip_vs_conn *cp, int direction,
509 const struct sk_buff *skb,
510 struct ip_vs_app *app);
511
512 void (*timeout_change)(struct ip_vs_app *app, int flags);
513};
514
515
516/*
517 * IPVS core functions
518 * (from ip_vs_core.c)
519 */
520extern const char *ip_vs_proto_name(unsigned proto);
521extern void ip_vs_init_hash_table(struct list_head *table, int rows);
afdd6140 522#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1da177e4 523
1da177e4
LT		 524#define IP_VS_APP_TYPE_FTP 1
525
526/*
527 * ip_vs_conn handling functions
528 * (from ip_vs_conn.c)
529 */
530
531/*
532 * IPVS connection entry hash table
533 */
534#ifndef CONFIG_IP_VS_TAB_BITS
535#define CONFIG_IP_VS_TAB_BITS 12
536#endif
537/* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
538#if CONFIG_IP_VS_TAB_BITS < 8
539#define IP_VS_CONN_TAB_BITS 8
540#endif
541#if CONFIG_IP_VS_TAB_BITS > 20
542#define IP_VS_CONN_TAB_BITS 20
543#endif
544#if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
545#define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
546#endif
547#define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
548#define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
549
550enum {
551 IP_VS_DIR_INPUT = 0,
552 IP_VS_DIR_OUTPUT,
553 IP_VS_DIR_INPUT_ONLY,
554 IP_VS_DIR_LAST,
555};
556
557extern struct ip_vs_conn *ip_vs_conn_in_get
014d730d 558(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
87375ab4 559extern struct ip_vs_conn *ip_vs_ct_in_get
014d730d 560(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
1da177e4 561extern struct ip_vs_conn *ip_vs_conn_out_get
014d730d 562(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
1da177e4
LT		 563
564/* put back the conn without restarting its timer */
565static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
566{
567 atomic_dec(&cp->refcnt);
568}
569extern void ip_vs_conn_put(struct ip_vs_conn *cp);
014d730d 570extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1da177e4
LT		 571
572extern struct ip_vs_conn *
014d730d
AV		 573ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport,
574 __be32 daddr, __be16 dport, unsigned flags,
1da177e4
LT		 575 struct ip_vs_dest *dest);
576extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
577
578extern const char * ip_vs_state_name(__u16 proto, int state);
579
580extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
581extern int ip_vs_check_template(struct ip_vs_conn *ct);
1da177e4
LT		 582extern void ip_vs_random_dropentry(void);
583extern int ip_vs_conn_init(void);
584extern void ip_vs_conn_cleanup(void);
585
586static inline void ip_vs_control_del(struct ip_vs_conn *cp)
587{
588 struct ip_vs_conn *ctl_cp = cp->control;
589 if (!ctl_cp) {
590 IP_VS_ERR("request control DEL for uncontrolled: "
591 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
592 NIPQUAD(cp->caddr),ntohs(cp->cport),
593 NIPQUAD(cp->vaddr),ntohs(cp->vport));
594 return;
595 }
596
597 IP_VS_DBG(7, "DELeting control for: "
598 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
599 NIPQUAD(cp->caddr),ntohs(cp->cport),
600 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
601
602 cp->control = NULL;
603 if (atomic_read(&ctl_cp->n_control) == 0) {
604 IP_VS_ERR("BUG control DEL with n=0 : "
605 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
606 NIPQUAD(cp->caddr),ntohs(cp->cport),
607 NIPQUAD(cp->vaddr),ntohs(cp->vport));
608 return;
609 }
610 atomic_dec(&ctl_cp->n_control);
611}
612
613static inline void
614ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
615{
616 if (cp->control) {
617 IP_VS_ERR("request control ADD for already controlled: "
618 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
619 NIPQUAD(cp->caddr),ntohs(cp->cport),
620 NIPQUAD(cp->vaddr),ntohs(cp->vport));
621 ip_vs_control_del(cp);
622 }
623
624 IP_VS_DBG(7, "ADDing control for: "
625 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
626 NIPQUAD(cp->caddr),ntohs(cp->cport),
627 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
628
629 cp->control = ctl_cp;
630 atomic_inc(&ctl_cp->n_control);
631}
632
633
634/*
635 * IPVS application functions
636 * (from ip_vs_app.c)
637 */
638#define IP_VS_APP_MAX_PORTS 8
639extern int register_ip_vs_app(struct ip_vs_app *app);
640extern void unregister_ip_vs_app(struct ip_vs_app *app);
641extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
642extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
643extern int
644register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
645extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
646extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
647
3db05fea
HX		 648extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
649extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
dd0fc66f 650extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
1da177e4
LT		 651 char *o_buf, int o_len, char *n_buf, int n_len);
652extern int ip_vs_app_init(void);
653extern void ip_vs_app_cleanup(void);
654
655
656/*
657 * IPVS protocol functions (from ip_vs_proto.c)
658 */
659extern int ip_vs_protocol_init(void);
660extern void ip_vs_protocol_cleanup(void);
661extern void ip_vs_protocol_timeout_change(int flags);
662extern int *ip_vs_create_timeout_table(int *table, int size);
663extern int
664ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
665extern void
666ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
667 int offset, const char *msg);
668
669extern struct ip_vs_protocol ip_vs_protocol_tcp;
670extern struct ip_vs_protocol ip_vs_protocol_udp;
671extern struct ip_vs_protocol ip_vs_protocol_icmp;
672extern struct ip_vs_protocol ip_vs_protocol_esp;
673extern struct ip_vs_protocol ip_vs_protocol_ah;
674
675
676/*
677 * Registering/unregistering scheduler functions
678 * (from ip_vs_sched.c)
679 */
680extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
681extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
682extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
683 struct ip_vs_scheduler *scheduler);
684extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
685extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
686extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
687extern struct ip_vs_conn *
688ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
689extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
690 struct ip_vs_protocol *pp);
691
692
693/*
694 * IPVS control data and functions (from ip_vs_ctl.c)
695 */
696extern int sysctl_ip_vs_cache_bypass;
697extern int sysctl_ip_vs_expire_nodest_conn;
698extern int sysctl_ip_vs_expire_quiescent_template;
699extern int sysctl_ip_vs_sync_threshold[2];
700extern int sysctl_ip_vs_nat_icmp_send;
701extern struct ip_vs_stats ip_vs_stats;
5587da55 702extern const struct ctl_path net_vs_ctl_path[];
1da177e4
LT		 703
704extern struct ip_vs_service *
014d730d 705ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
1da177e4
LT		 706
707static inline void ip_vs_service_put(struct ip_vs_service *svc)
708{
709 atomic_dec(&svc->usecnt);
710}
711
712extern struct ip_vs_dest *
014d730d 713ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport);
1da177e4
LT		 714extern int ip_vs_use_count_inc(void);
715extern void ip_vs_use_count_dec(void);
716extern int ip_vs_control_init(void);
717extern void ip_vs_control_cleanup(void);
1e356f9c
RB		 718extern struct ip_vs_dest *
719ip_vs_find_dest(__be32 daddr, __be16 dport,
720 __be32 vaddr, __be16 vport, __u16 protocol);
721extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1da177e4
LT		 722
723
724/*
725 * IPVS sync daemon data and function prototypes
726 * (from ip_vs_sync.c)
727 */
728extern volatile int ip_vs_sync_state;
729extern volatile int ip_vs_master_syncid;
730extern volatile int ip_vs_backup_syncid;
731extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
732extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
733extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
734extern int stop_sync_thread(int state);
735extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
736
737
738/*
739 * IPVS rate estimator prototypes (from ip_vs_est.c)
740 */
a919cf4b
SW		 741extern int ip_vs_estimator_init(void);
742extern void ip_vs_estimator_cleanup(void);
3a14a313 743extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
1da177e4
LT		 744extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
745extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
746
747/*
748 * Various IPVS packet transmitters (from ip_vs_xmit.c)
749 */
750extern int ip_vs_null_xmit
751(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
752extern int ip_vs_bypass_xmit
753(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
754extern int ip_vs_nat_xmit
755(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
756extern int ip_vs_tunnel_xmit
757(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
758extern int ip_vs_dr_xmit
759(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
760extern int ip_vs_icmp_xmit
761(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
762extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
763
764
765/*
766 * This is a simple mechanism to ignore packets when
767 * we are loaded. Just set ip_vs_drop_rate to 'n' and
768 * we start to drop 1/rate of the packets
769 */
770extern int ip_vs_drop_rate;
771extern int ip_vs_drop_counter;
772
773static __inline__ int ip_vs_todrop(void)
774{
775 if (!ip_vs_drop_rate) return 0;
776 if (--ip_vs_drop_counter > 0) return 0;
777 ip_vs_drop_counter = ip_vs_drop_rate;
778 return 1;
779}
780
781/*
782 * ip_vs_fwd_tag returns the forwarding tag of the connection
783 */
784#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
785
732db659 786static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1da177e4
LT		 787{
788 char fwd;
789
790 switch (IP_VS_FWD_METHOD(cp)) {
791 case IP_VS_CONN_F_MASQ:
792 fwd = 'M'; break;
793 case IP_VS_CONN_F_LOCALNODE:
794 fwd = 'L'; break;
795 case IP_VS_CONN_F_TUNNEL:
796 fwd = 'T'; break;
797 case IP_VS_CONN_F_DROUTE:
798 fwd = 'R'; break;
799 case IP_VS_CONN_F_BYPASS:
800 fwd = 'B'; break;
801 default:
802 fwd = '?'; break;
803 }
804 return fwd;
805}
806
1da177e4
LT		 807extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
808 struct ip_vs_conn *cp, int dir);
809
b1550f22 810extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1da177e4 811
f9214b26 812static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1da177e4 813{
f9214b26 814 __be32 diff[2] = { ~old, new };
1da177e4 815
f9214b26
AV		 816 return csum_partial((char *) diff, sizeof(diff), oldsum);
817}
818
819static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
820{
821 __be16 diff[2] = { ~old, new };
822
823 return csum_partial((char *) diff, sizeof(diff), oldsum);
1da177e4
LT		 824}
825
826#endif /* __KERNEL__ */
827
bc4768eb 828#endif /* _NET_IP_VS_H */
Linux kernel - Deliverables
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