Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
24 | |
25 | #ifdef CONFIG_IP_VS_DEBUG | |
14c85021 ACM |
26 | #include <linux/net.h> |
27 | ||
1da177e4 LT |
28 | extern int ip_vs_get_debug_level(void); |
29 | #define IP_VS_DBG(level, msg...) \ | |
30 | do { \ | |
31 | if (level <= ip_vs_get_debug_level()) \ | |
32 | printk(KERN_DEBUG "IPVS: " msg); \ | |
33 | } while (0) | |
34 | #define IP_VS_DBG_RL(msg...) \ | |
35 | do { \ | |
36 | if (net_ratelimit()) \ | |
37 | printk(KERN_DEBUG "IPVS: " msg); \ | |
38 | } while (0) | |
39 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ | |
40 | do { \ | |
41 | if (level <= ip_vs_get_debug_level()) \ | |
42 | pp->debug_packet(pp, skb, ofs, msg); \ | |
43 | } while (0) | |
44 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ | |
45 | do { \ | |
46 | if (level <= ip_vs_get_debug_level() && \ | |
47 | net_ratelimit()) \ | |
48 | pp->debug_packet(pp, skb, ofs, msg); \ | |
49 | } while (0) | |
50 | #else /* NO DEBUGGING at ALL */ | |
51 | #define IP_VS_DBG(level, msg...) do {} while (0) | |
52 | #define IP_VS_DBG_RL(msg...) do {} while (0) | |
53 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
54 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
55 | #endif | |
56 | ||
57 | #define IP_VS_BUG() BUG() | |
58 | #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg) | |
59 | #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg) | |
60 | #define IP_VS_WARNING(msg...) \ | |
61 | printk(KERN_WARNING "IPVS: " msg) | |
62 | #define IP_VS_ERR_RL(msg...) \ | |
63 | do { \ | |
64 | if (net_ratelimit()) \ | |
65 | printk(KERN_ERR "IPVS: " msg); \ | |
66 | } while (0) | |
67 | ||
68 | #ifdef CONFIG_IP_VS_DEBUG | |
69 | #define EnterFunction(level) \ | |
70 | do { \ | |
71 | if (level <= ip_vs_get_debug_level()) \ | |
72 | printk(KERN_DEBUG "Enter: %s, %s line %i\n", \ | |
73 | __FUNCTION__, __FILE__, __LINE__); \ | |
74 | } while (0) | |
75 | #define LeaveFunction(level) \ | |
76 | do { \ | |
77 | if (level <= ip_vs_get_debug_level()) \ | |
78 | printk(KERN_DEBUG "Leave: %s, %s line %i\n", \ | |
79 | __FUNCTION__, __FILE__, __LINE__); \ | |
80 | } while (0) | |
81 | #else | |
82 | #define EnterFunction(level) do {} while (0) | |
83 | #define LeaveFunction(level) do {} while (0) | |
84 | #endif | |
85 | ||
86 | #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } | |
87 | ||
88 | ||
89 | /* | |
90 | * The port number of FTP service (in network order). | |
91 | */ | |
92 | #define FTPPORT __constant_htons(21) | |
93 | #define FTPDATA __constant_htons(20) | |
94 | ||
1da177e4 LT |
95 | /* |
96 | * TCP State Values | |
97 | */ | |
98 | enum { | |
99 | IP_VS_TCP_S_NONE = 0, | |
100 | IP_VS_TCP_S_ESTABLISHED, | |
101 | IP_VS_TCP_S_SYN_SENT, | |
102 | IP_VS_TCP_S_SYN_RECV, | |
103 | IP_VS_TCP_S_FIN_WAIT, | |
104 | IP_VS_TCP_S_TIME_WAIT, | |
105 | IP_VS_TCP_S_CLOSE, | |
106 | IP_VS_TCP_S_CLOSE_WAIT, | |
107 | IP_VS_TCP_S_LAST_ACK, | |
108 | IP_VS_TCP_S_LISTEN, | |
109 | IP_VS_TCP_S_SYNACK, | |
110 | IP_VS_TCP_S_LAST | |
111 | }; | |
112 | ||
113 | /* | |
114 | * UDP State Values | |
115 | */ | |
116 | enum { | |
117 | IP_VS_UDP_S_NORMAL, | |
118 | IP_VS_UDP_S_LAST, | |
119 | }; | |
120 | ||
121 | /* | |
122 | * ICMP State Values | |
123 | */ | |
124 | enum { | |
125 | IP_VS_ICMP_S_NORMAL, | |
126 | IP_VS_ICMP_S_LAST, | |
127 | }; | |
128 | ||
129 | /* | |
130 | * Delta sequence info structure | |
131 | * Each ip_vs_conn has 2 (output AND input seq. changes). | |
132 | * Only used in the VS/NAT. | |
133 | */ | |
134 | struct ip_vs_seq { | |
135 | __u32 init_seq; /* Add delta from this seq */ | |
136 | __u32 delta; /* Delta in sequence numbers */ | |
137 | __u32 previous_delta; /* Delta in sequence numbers | |
138 | before last resized pkt */ | |
139 | }; | |
140 | ||
141 | ||
142 | /* | |
143 | * IPVS statistics object | |
144 | */ | |
145 | struct ip_vs_stats | |
146 | { | |
147 | __u32 conns; /* connections scheduled */ | |
148 | __u32 inpkts; /* incoming packets */ | |
149 | __u32 outpkts; /* outgoing packets */ | |
150 | __u64 inbytes; /* incoming bytes */ | |
151 | __u64 outbytes; /* outgoing bytes */ | |
152 | ||
153 | __u32 cps; /* current connection rate */ | |
154 | __u32 inpps; /* current in packet rate */ | |
155 | __u32 outpps; /* current out packet rate */ | |
156 | __u32 inbps; /* current in byte rate */ | |
157 | __u32 outbps; /* current out byte rate */ | |
158 | ||
159 | spinlock_t lock; /* spin lock */ | |
160 | }; | |
161 | ||
14c85021 ACM |
162 | struct dst_entry; |
163 | struct iphdr; | |
1da177e4 LT |
164 | struct ip_vs_conn; |
165 | struct ip_vs_app; | |
14c85021 | 166 | struct sk_buff; |
1da177e4 LT |
167 | |
168 | struct ip_vs_protocol { | |
169 | struct ip_vs_protocol *next; | |
170 | char *name; | |
2ad17def JA |
171 | u16 protocol; |
172 | u16 num_states; | |
1da177e4 LT |
173 | int dont_defrag; |
174 | atomic_t appcnt; /* counter of proto app incs */ | |
175 | int *timeout_table; /* protocol timeout table */ | |
176 | ||
177 | void (*init)(struct ip_vs_protocol *pp); | |
178 | ||
179 | void (*exit)(struct ip_vs_protocol *pp); | |
180 | ||
181 | int (*conn_schedule)(struct sk_buff *skb, | |
182 | struct ip_vs_protocol *pp, | |
183 | int *verdict, struct ip_vs_conn **cpp); | |
184 | ||
185 | struct ip_vs_conn * | |
186 | (*conn_in_get)(const struct sk_buff *skb, | |
187 | struct ip_vs_protocol *pp, | |
188 | const struct iphdr *iph, | |
189 | unsigned int proto_off, | |
190 | int inverse); | |
191 | ||
192 | struct ip_vs_conn * | |
193 | (*conn_out_get)(const struct sk_buff *skb, | |
194 | struct ip_vs_protocol *pp, | |
195 | const struct iphdr *iph, | |
196 | unsigned int proto_off, | |
197 | int inverse); | |
198 | ||
3db05fea | 199 | int (*snat_handler)(struct sk_buff *skb, |
1da177e4 LT |
200 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
201 | ||
3db05fea | 202 | int (*dnat_handler)(struct sk_buff *skb, |
1da177e4 LT |
203 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
204 | ||
205 | int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); | |
206 | ||
207 | const char *(*state_name)(int state); | |
208 | ||
209 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
210 | const struct sk_buff *skb, | |
211 | struct ip_vs_protocol *pp); | |
212 | ||
213 | int (*register_app)(struct ip_vs_app *inc); | |
214 | ||
215 | void (*unregister_app)(struct ip_vs_app *inc); | |
216 | ||
217 | int (*app_conn_bind)(struct ip_vs_conn *cp); | |
218 | ||
219 | void (*debug_packet)(struct ip_vs_protocol *pp, | |
220 | const struct sk_buff *skb, | |
221 | int offset, | |
222 | const char *msg); | |
223 | ||
224 | void (*timeout_change)(struct ip_vs_protocol *pp, int flags); | |
225 | ||
226 | int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); | |
227 | }; | |
228 | ||
229 | extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); | |
230 | ||
231 | /* | |
232 | * IP_VS structure allocated for each dynamically scheduled connection | |
233 | */ | |
234 | struct ip_vs_conn { | |
235 | struct list_head c_list; /* hashed list heads */ | |
236 | ||
237 | /* Protocol, addresses and port numbers */ | |
014d730d AV |
238 | __be32 caddr; /* client address */ |
239 | __be32 vaddr; /* virtual address */ | |
240 | __be32 daddr; /* destination address */ | |
241 | __be16 cport; | |
242 | __be16 vport; | |
243 | __be16 dport; | |
1da177e4 LT |
244 | __u16 protocol; /* Which protocol (TCP/UDP) */ |
245 | ||
246 | /* counter and timer */ | |
247 | atomic_t refcnt; /* reference count */ | |
248 | struct timer_list timer; /* Expiration timer */ | |
249 | volatile unsigned long timeout; /* timeout */ | |
250 | ||
251 | /* Flags and state transition */ | |
252 | spinlock_t lock; /* lock for state transition */ | |
253 | volatile __u16 flags; /* status flags */ | |
254 | volatile __u16 state; /* state info */ | |
efac5276 RB |
255 | volatile __u16 old_state; /* old state, to be used for |
256 | * state transition triggerd | |
257 | * synchronization | |
258 | */ | |
1da177e4 LT |
259 | |
260 | /* Control members */ | |
261 | struct ip_vs_conn *control; /* Master control connection */ | |
262 | atomic_t n_control; /* Number of controlled ones */ | |
263 | struct ip_vs_dest *dest; /* real server */ | |
264 | atomic_t in_pkts; /* incoming packet counter */ | |
265 | ||
266 | /* packet transmitter for different forwarding methods. If it | |
267 | mangles the packet, it must return NF_DROP or better NF_STOLEN, | |
268 | otherwise this must be changed to a sk_buff **. | |
269 | */ | |
270 | int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, | |
271 | struct ip_vs_protocol *pp); | |
272 | ||
273 | /* Note: we can group the following members into a structure, | |
274 | in order to save more space, and the following members are | |
275 | only used in VS/NAT anyway */ | |
276 | struct ip_vs_app *app; /* bound ip_vs_app object */ | |
277 | void *app_data; /* Application private data */ | |
278 | struct ip_vs_seq in_seq; /* incoming seq. struct */ | |
279 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ | |
280 | }; | |
281 | ||
282 | ||
283 | /* | |
284 | * The information about the virtual service offered to the net | |
285 | * and the forwarding entries | |
286 | */ | |
287 | struct ip_vs_service { | |
288 | struct list_head s_list; /* for normal service table */ | |
289 | struct list_head f_list; /* for fwmark-based service table */ | |
290 | atomic_t refcnt; /* reference counter */ | |
291 | atomic_t usecnt; /* use counter */ | |
292 | ||
293 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
014d730d AV |
294 | __be32 addr; /* IP address for virtual service */ |
295 | __be16 port; /* port number for the service */ | |
1da177e4 LT |
296 | __u32 fwmark; /* firewall mark of the service */ |
297 | unsigned flags; /* service status flags */ | |
298 | unsigned timeout; /* persistent timeout in ticks */ | |
014d730d | 299 | __be32 netmask; /* grouping granularity */ |
1da177e4 LT |
300 | |
301 | struct list_head destinations; /* real server d-linked list */ | |
302 | __u32 num_dests; /* number of servers */ | |
303 | struct ip_vs_stats stats; /* statistics for the service */ | |
304 | struct ip_vs_app *inc; /* bind conns to this app inc */ | |
305 | ||
306 | /* for scheduling */ | |
307 | struct ip_vs_scheduler *scheduler; /* bound scheduler object */ | |
308 | rwlock_t sched_lock; /* lock sched_data */ | |
309 | void *sched_data; /* scheduler application data */ | |
310 | }; | |
311 | ||
312 | ||
313 | /* | |
314 | * The real server destination forwarding entry | |
315 | * with ip address, port number, and so on. | |
316 | */ | |
317 | struct ip_vs_dest { | |
318 | struct list_head n_list; /* for the dests in the service */ | |
319 | struct list_head d_list; /* for table with all the dests */ | |
320 | ||
014d730d AV |
321 | __be32 addr; /* IP address of the server */ |
322 | __be16 port; /* port number of the server */ | |
1da177e4 LT |
323 | volatile unsigned flags; /* dest status flags */ |
324 | atomic_t conn_flags; /* flags to copy to conn */ | |
325 | atomic_t weight; /* server weight */ | |
326 | ||
327 | atomic_t refcnt; /* reference counter */ | |
328 | struct ip_vs_stats stats; /* statistics */ | |
329 | ||
330 | /* connection counters and thresholds */ | |
331 | atomic_t activeconns; /* active connections */ | |
332 | atomic_t inactconns; /* inactive connections */ | |
333 | atomic_t persistconns; /* persistent connections */ | |
334 | __u32 u_threshold; /* upper threshold */ | |
335 | __u32 l_threshold; /* lower threshold */ | |
336 | ||
337 | /* for destination cache */ | |
338 | spinlock_t dst_lock; /* lock of dst_cache */ | |
339 | struct dst_entry *dst_cache; /* destination cache entry */ | |
340 | u32 dst_rtos; /* RT_TOS(tos) for dst */ | |
341 | ||
342 | /* for virtual service */ | |
343 | struct ip_vs_service *svc; /* service it belongs to */ | |
344 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
014d730d AV |
345 | __be32 vaddr; /* virtual IP address */ |
346 | __be16 vport; /* virtual port number */ | |
1da177e4 LT |
347 | __u32 vfwmark; /* firewall mark of service */ |
348 | }; | |
349 | ||
350 | ||
351 | /* | |
352 | * The scheduler object | |
353 | */ | |
354 | struct ip_vs_scheduler { | |
355 | struct list_head n_list; /* d-linked list head */ | |
356 | char *name; /* scheduler name */ | |
357 | atomic_t refcnt; /* reference counter */ | |
358 | struct module *module; /* THIS_MODULE/NULL */ | |
359 | ||
360 | /* scheduler initializing service */ | |
361 | int (*init_service)(struct ip_vs_service *svc); | |
362 | /* scheduling service finish */ | |
363 | int (*done_service)(struct ip_vs_service *svc); | |
364 | /* scheduler updating service */ | |
365 | int (*update_service)(struct ip_vs_service *svc); | |
366 | ||
367 | /* selecting a server from the given service */ | |
368 | struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, | |
369 | const struct sk_buff *skb); | |
370 | }; | |
371 | ||
372 | ||
373 | /* | |
374 | * The application module object (a.k.a. app incarnation) | |
375 | */ | |
376 | struct ip_vs_app | |
377 | { | |
378 | struct list_head a_list; /* member in app list */ | |
379 | int type; /* IP_VS_APP_TYPE_xxx */ | |
380 | char *name; /* application module name */ | |
381 | __u16 protocol; | |
382 | struct module *module; /* THIS_MODULE/NULL */ | |
383 | struct list_head incs_list; /* list of incarnations */ | |
384 | ||
385 | /* members for application incarnations */ | |
386 | struct list_head p_list; /* member in proto app list */ | |
387 | struct ip_vs_app *app; /* its real application */ | |
014d730d | 388 | __be16 port; /* port number in net order */ |
1da177e4 LT |
389 | atomic_t usecnt; /* usage counter */ |
390 | ||
391 | /* output hook: return false if can't linearize. diff set for TCP. */ | |
392 | int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, | |
3db05fea | 393 | struct sk_buff *, int *diff); |
1da177e4 LT |
394 | |
395 | /* input hook: return false if can't linearize. diff set for TCP. */ | |
396 | int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, | |
3db05fea | 397 | struct sk_buff *, int *diff); |
1da177e4 LT |
398 | |
399 | /* ip_vs_app initializer */ | |
400 | int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
401 | ||
402 | /* ip_vs_app finish */ | |
403 | int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
404 | ||
405 | ||
406 | /* not used now */ | |
407 | int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, | |
408 | struct ip_vs_protocol *); | |
409 | ||
410 | void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
411 | ||
412 | int * timeout_table; | |
413 | int * timeouts; | |
414 | int timeouts_size; | |
415 | ||
416 | int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, | |
417 | int *verdict, struct ip_vs_conn **cpp); | |
418 | ||
419 | struct ip_vs_conn * | |
420 | (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
421 | const struct iphdr *iph, unsigned int proto_off, | |
422 | int inverse); | |
423 | ||
424 | struct ip_vs_conn * | |
425 | (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
426 | const struct iphdr *iph, unsigned int proto_off, | |
427 | int inverse); | |
428 | ||
429 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
430 | const struct sk_buff *skb, | |
431 | struct ip_vs_app *app); | |
432 | ||
433 | void (*timeout_change)(struct ip_vs_app *app, int flags); | |
434 | }; | |
435 | ||
436 | ||
437 | /* | |
438 | * IPVS core functions | |
439 | * (from ip_vs_core.c) | |
440 | */ | |
441 | extern const char *ip_vs_proto_name(unsigned proto); | |
442 | extern void ip_vs_init_hash_table(struct list_head *table, int rows); | |
443 | #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) | |
444 | ||
1da177e4 LT |
445 | #define IP_VS_APP_TYPE_FTP 1 |
446 | ||
447 | /* | |
448 | * ip_vs_conn handling functions | |
449 | * (from ip_vs_conn.c) | |
450 | */ | |
451 | ||
452 | /* | |
453 | * IPVS connection entry hash table | |
454 | */ | |
455 | #ifndef CONFIG_IP_VS_TAB_BITS | |
456 | #define CONFIG_IP_VS_TAB_BITS 12 | |
457 | #endif | |
458 | /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ | |
459 | #if CONFIG_IP_VS_TAB_BITS < 8 | |
460 | #define IP_VS_CONN_TAB_BITS 8 | |
461 | #endif | |
462 | #if CONFIG_IP_VS_TAB_BITS > 20 | |
463 | #define IP_VS_CONN_TAB_BITS 20 | |
464 | #endif | |
465 | #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 | |
466 | #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS | |
467 | #endif | |
468 | #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) | |
469 | #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) | |
470 | ||
471 | enum { | |
472 | IP_VS_DIR_INPUT = 0, | |
473 | IP_VS_DIR_OUTPUT, | |
474 | IP_VS_DIR_INPUT_ONLY, | |
475 | IP_VS_DIR_LAST, | |
476 | }; | |
477 | ||
478 | extern struct ip_vs_conn *ip_vs_conn_in_get | |
014d730d | 479 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
87375ab4 | 480 | extern struct ip_vs_conn *ip_vs_ct_in_get |
014d730d | 481 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
1da177e4 | 482 | extern struct ip_vs_conn *ip_vs_conn_out_get |
014d730d | 483 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
1da177e4 LT |
484 | |
485 | /* put back the conn without restarting its timer */ | |
486 | static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) | |
487 | { | |
488 | atomic_dec(&cp->refcnt); | |
489 | } | |
490 | extern void ip_vs_conn_put(struct ip_vs_conn *cp); | |
014d730d | 491 | extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); |
1da177e4 LT |
492 | |
493 | extern struct ip_vs_conn * | |
014d730d AV |
494 | ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport, |
495 | __be32 daddr, __be16 dport, unsigned flags, | |
1da177e4 LT |
496 | struct ip_vs_dest *dest); |
497 | extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); | |
498 | ||
499 | extern const char * ip_vs_state_name(__u16 proto, int state); | |
500 | ||
501 | extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); | |
502 | extern int ip_vs_check_template(struct ip_vs_conn *ct); | |
1da177e4 LT |
503 | extern void ip_vs_random_dropentry(void); |
504 | extern int ip_vs_conn_init(void); | |
505 | extern void ip_vs_conn_cleanup(void); | |
506 | ||
507 | static inline void ip_vs_control_del(struct ip_vs_conn *cp) | |
508 | { | |
509 | struct ip_vs_conn *ctl_cp = cp->control; | |
510 | if (!ctl_cp) { | |
511 | IP_VS_ERR("request control DEL for uncontrolled: " | |
512 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
513 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
514 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
515 | return; | |
516 | } | |
517 | ||
518 | IP_VS_DBG(7, "DELeting control for: " | |
519 | "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", | |
520 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
521 | NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); | |
522 | ||
523 | cp->control = NULL; | |
524 | if (atomic_read(&ctl_cp->n_control) == 0) { | |
525 | IP_VS_ERR("BUG control DEL with n=0 : " | |
526 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
527 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
528 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
529 | return; | |
530 | } | |
531 | atomic_dec(&ctl_cp->n_control); | |
532 | } | |
533 | ||
534 | static inline void | |
535 | ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) | |
536 | { | |
537 | if (cp->control) { | |
538 | IP_VS_ERR("request control ADD for already controlled: " | |
539 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
540 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
541 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
542 | ip_vs_control_del(cp); | |
543 | } | |
544 | ||
545 | IP_VS_DBG(7, "ADDing control for: " | |
546 | "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", | |
547 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
548 | NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); | |
549 | ||
550 | cp->control = ctl_cp; | |
551 | atomic_inc(&ctl_cp->n_control); | |
552 | } | |
553 | ||
554 | ||
555 | /* | |
556 | * IPVS application functions | |
557 | * (from ip_vs_app.c) | |
558 | */ | |
559 | #define IP_VS_APP_MAX_PORTS 8 | |
560 | extern int register_ip_vs_app(struct ip_vs_app *app); | |
561 | extern void unregister_ip_vs_app(struct ip_vs_app *app); | |
562 | extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
563 | extern void ip_vs_unbind_app(struct ip_vs_conn *cp); | |
564 | extern int | |
565 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); | |
566 | extern int ip_vs_app_inc_get(struct ip_vs_app *inc); | |
567 | extern void ip_vs_app_inc_put(struct ip_vs_app *inc); | |
568 | ||
3db05fea HX |
569 | extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); |
570 | extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); | |
dd0fc66f | 571 | extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
1da177e4 LT |
572 | char *o_buf, int o_len, char *n_buf, int n_len); |
573 | extern int ip_vs_app_init(void); | |
574 | extern void ip_vs_app_cleanup(void); | |
575 | ||
576 | ||
577 | /* | |
578 | * IPVS protocol functions (from ip_vs_proto.c) | |
579 | */ | |
580 | extern int ip_vs_protocol_init(void); | |
581 | extern void ip_vs_protocol_cleanup(void); | |
582 | extern void ip_vs_protocol_timeout_change(int flags); | |
583 | extern int *ip_vs_create_timeout_table(int *table, int size); | |
584 | extern int | |
585 | ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); | |
586 | extern void | |
587 | ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, | |
588 | int offset, const char *msg); | |
589 | ||
590 | extern struct ip_vs_protocol ip_vs_protocol_tcp; | |
591 | extern struct ip_vs_protocol ip_vs_protocol_udp; | |
592 | extern struct ip_vs_protocol ip_vs_protocol_icmp; | |
593 | extern struct ip_vs_protocol ip_vs_protocol_esp; | |
594 | extern struct ip_vs_protocol ip_vs_protocol_ah; | |
595 | ||
596 | ||
597 | /* | |
598 | * Registering/unregistering scheduler functions | |
599 | * (from ip_vs_sched.c) | |
600 | */ | |
601 | extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
602 | extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
603 | extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, | |
604 | struct ip_vs_scheduler *scheduler); | |
605 | extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); | |
606 | extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); | |
607 | extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); | |
608 | extern struct ip_vs_conn * | |
609 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); | |
610 | extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
611 | struct ip_vs_protocol *pp); | |
612 | ||
613 | ||
614 | /* | |
615 | * IPVS control data and functions (from ip_vs_ctl.c) | |
616 | */ | |
617 | extern int sysctl_ip_vs_cache_bypass; | |
618 | extern int sysctl_ip_vs_expire_nodest_conn; | |
619 | extern int sysctl_ip_vs_expire_quiescent_template; | |
620 | extern int sysctl_ip_vs_sync_threshold[2]; | |
621 | extern int sysctl_ip_vs_nat_icmp_send; | |
622 | extern struct ip_vs_stats ip_vs_stats; | |
90754f8e | 623 | extern struct ctl_path net_vs_ctl_path[]; |
1da177e4 LT |
624 | |
625 | extern struct ip_vs_service * | |
014d730d | 626 | ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport); |
1da177e4 LT |
627 | |
628 | static inline void ip_vs_service_put(struct ip_vs_service *svc) | |
629 | { | |
630 | atomic_dec(&svc->usecnt); | |
631 | } | |
632 | ||
633 | extern struct ip_vs_dest * | |
014d730d | 634 | ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport); |
1da177e4 LT |
635 | extern int ip_vs_use_count_inc(void); |
636 | extern void ip_vs_use_count_dec(void); | |
637 | extern int ip_vs_control_init(void); | |
638 | extern void ip_vs_control_cleanup(void); | |
1e356f9c RB |
639 | extern struct ip_vs_dest * |
640 | ip_vs_find_dest(__be32 daddr, __be16 dport, | |
641 | __be32 vaddr, __be16 vport, __u16 protocol); | |
642 | extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); | |
1da177e4 LT |
643 | |
644 | ||
645 | /* | |
646 | * IPVS sync daemon data and function prototypes | |
647 | * (from ip_vs_sync.c) | |
648 | */ | |
649 | extern volatile int ip_vs_sync_state; | |
650 | extern volatile int ip_vs_master_syncid; | |
651 | extern volatile int ip_vs_backup_syncid; | |
652 | extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
653 | extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
654 | extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); | |
655 | extern int stop_sync_thread(int state); | |
656 | extern void ip_vs_sync_conn(struct ip_vs_conn *cp); | |
657 | ||
658 | ||
659 | /* | |
660 | * IPVS rate estimator prototypes (from ip_vs_est.c) | |
661 | */ | |
662 | extern int ip_vs_new_estimator(struct ip_vs_stats *stats); | |
663 | extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); | |
664 | extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); | |
665 | ||
666 | /* | |
667 | * Various IPVS packet transmitters (from ip_vs_xmit.c) | |
668 | */ | |
669 | extern int ip_vs_null_xmit | |
670 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
671 | extern int ip_vs_bypass_xmit | |
672 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
673 | extern int ip_vs_nat_xmit | |
674 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
675 | extern int ip_vs_tunnel_xmit | |
676 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
677 | extern int ip_vs_dr_xmit | |
678 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
679 | extern int ip_vs_icmp_xmit | |
680 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); | |
681 | extern void ip_vs_dst_reset(struct ip_vs_dest *dest); | |
682 | ||
683 | ||
684 | /* | |
685 | * This is a simple mechanism to ignore packets when | |
686 | * we are loaded. Just set ip_vs_drop_rate to 'n' and | |
687 | * we start to drop 1/rate of the packets | |
688 | */ | |
689 | extern int ip_vs_drop_rate; | |
690 | extern int ip_vs_drop_counter; | |
691 | ||
692 | static __inline__ int ip_vs_todrop(void) | |
693 | { | |
694 | if (!ip_vs_drop_rate) return 0; | |
695 | if (--ip_vs_drop_counter > 0) return 0; | |
696 | ip_vs_drop_counter = ip_vs_drop_rate; | |
697 | return 1; | |
698 | } | |
699 | ||
700 | /* | |
701 | * ip_vs_fwd_tag returns the forwarding tag of the connection | |
702 | */ | |
703 | #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) | |
704 | ||
732db659 | 705 | static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) |
1da177e4 LT |
706 | { |
707 | char fwd; | |
708 | ||
709 | switch (IP_VS_FWD_METHOD(cp)) { | |
710 | case IP_VS_CONN_F_MASQ: | |
711 | fwd = 'M'; break; | |
712 | case IP_VS_CONN_F_LOCALNODE: | |
713 | fwd = 'L'; break; | |
714 | case IP_VS_CONN_F_TUNNEL: | |
715 | fwd = 'T'; break; | |
716 | case IP_VS_CONN_F_DROUTE: | |
717 | fwd = 'R'; break; | |
718 | case IP_VS_CONN_F_BYPASS: | |
719 | fwd = 'B'; break; | |
720 | default: | |
721 | fwd = '?'; break; | |
722 | } | |
723 | return fwd; | |
724 | } | |
725 | ||
1da177e4 LT |
726 | extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
727 | struct ip_vs_conn *cp, int dir); | |
728 | ||
b1550f22 | 729 | extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); |
1da177e4 | 730 | |
f9214b26 | 731 | static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) |
1da177e4 | 732 | { |
f9214b26 | 733 | __be32 diff[2] = { ~old, new }; |
1da177e4 | 734 | |
f9214b26 AV |
735 | return csum_partial((char *) diff, sizeof(diff), oldsum); |
736 | } | |
737 | ||
738 | static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) | |
739 | { | |
740 | __be16 diff[2] = { ~old, new }; | |
741 | ||
742 | return csum_partial((char *) diff, sizeof(diff), oldsum); | |
1da177e4 LT |
743 | } |
744 | ||
745 | #endif /* __KERNEL__ */ | |
746 | ||
bc4768eb | 747 | #endif /* _NET_IP_VS_H */ |