Root/
1 | /* |
2 | * IP Virtual Server |
3 | * data structure and functionality definitions |
4 | */ |
5 | |
6 | #ifndef _NET_IP_VS_H |
7 | #define _NET_IP_VS_H |
8 | |
9 | #include <linux/ip_vs.h> /* definitions shared with userland */ |
10 | |
11 | /* old ipvsadm versions still include this file directly */ |
12 | #ifdef __KERNEL__ |
13 | |
14 | #include <asm/types.h> /* for __uXX types */ |
15 | |
16 | #include <linux/sysctl.h> /* for ctl_path */ |
17 | #include <linux/list.h> /* for struct list_head */ |
18 | #include <linux/spinlock.h> /* for struct rwlock_t */ |
19 | #include <asm/atomic.h> /* for struct atomic_t */ |
20 | #include <linux/compiler.h> |
21 | #include <linux/timer.h> |
22 | |
23 | #include <net/checksum.h> |
24 | #include <linux/netfilter.h> /* for union nf_inet_addr */ |
25 | #include <linux/ip.h> |
26 | #include <linux/ipv6.h> /* for struct ipv6hdr */ |
27 | #include <net/ipv6.h> /* for ipv6_addr_copy */ |
28 | |
29 | |
30 | /* Connections' size value needed by ip_vs_ctl.c */ |
31 | extern int ip_vs_conn_tab_size; |
32 | |
33 | |
34 | struct ip_vs_iphdr { |
35 | int len; |
36 | __u8 protocol; |
37 | union nf_inet_addr saddr; |
38 | union nf_inet_addr daddr; |
39 | }; |
40 | |
41 | static inline void |
42 | ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr) |
43 | { |
44 | #ifdef CONFIG_IP_VS_IPV6 |
45 | if (af == AF_INET6) { |
46 | const struct ipv6hdr *iph = nh; |
47 | iphdr->len = sizeof(struct ipv6hdr); |
48 | iphdr->protocol = iph->nexthdr; |
49 | ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr); |
50 | ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr); |
51 | } else |
52 | #endif |
53 | { |
54 | const struct iphdr *iph = nh; |
55 | iphdr->len = iph->ihl * 4; |
56 | iphdr->protocol = iph->protocol; |
57 | iphdr->saddr.ip = iph->saddr; |
58 | iphdr->daddr.ip = iph->daddr; |
59 | } |
60 | } |
61 | |
62 | static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, |
63 | const union nf_inet_addr *src) |
64 | { |
65 | #ifdef CONFIG_IP_VS_IPV6 |
66 | if (af == AF_INET6) |
67 | ipv6_addr_copy(&dst->in6, &src->in6); |
68 | else |
69 | #endif |
70 | dst->ip = src->ip; |
71 | } |
72 | |
73 | static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, |
74 | const union nf_inet_addr *b) |
75 | { |
76 | #ifdef CONFIG_IP_VS_IPV6 |
77 | if (af == AF_INET6) |
78 | return ipv6_addr_equal(&a->in6, &b->in6); |
79 | #endif |
80 | return a->ip == b->ip; |
81 | } |
82 | |
83 | #ifdef CONFIG_IP_VS_DEBUG |
84 | #include <linux/net.h> |
85 | |
86 | extern int ip_vs_get_debug_level(void); |
87 | |
88 | static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, |
89 | const union nf_inet_addr *addr, |
90 | int *idx) |
91 | { |
92 | int len; |
93 | #ifdef CONFIG_IP_VS_IPV6 |
94 | if (af == AF_INET6) |
95 | len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]", |
96 | &addr->in6) + 1; |
97 | else |
98 | #endif |
99 | len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", |
100 | &addr->ip) + 1; |
101 | |
102 | *idx += len; |
103 | BUG_ON(*idx > buf_len + 1); |
104 | return &buf[*idx - len]; |
105 | } |
106 | |
107 | #define IP_VS_DBG_BUF(level, msg, ...) \ |
108 | do { \ |
109 | char ip_vs_dbg_buf[160]; \ |
110 | int ip_vs_dbg_idx = 0; \ |
111 | if (level <= ip_vs_get_debug_level()) \ |
112 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ |
113 | } while (0) |
114 | #define IP_VS_ERR_BUF(msg...) \ |
115 | do { \ |
116 | char ip_vs_dbg_buf[160]; \ |
117 | int ip_vs_dbg_idx = 0; \ |
118 | pr_err(msg); \ |
119 | } while (0) |
120 | |
121 | /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ |
122 | #define IP_VS_DBG_ADDR(af, addr) \ |
123 | ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ |
124 | sizeof(ip_vs_dbg_buf), addr, \ |
125 | &ip_vs_dbg_idx) |
126 | |
127 | #define IP_VS_DBG(level, msg, ...) \ |
128 | do { \ |
129 | if (level <= ip_vs_get_debug_level()) \ |
130 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ |
131 | } while (0) |
132 | #define IP_VS_DBG_RL(msg, ...) \ |
133 | do { \ |
134 | if (net_ratelimit()) \ |
135 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ |
136 | } while (0) |
137 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ |
138 | do { \ |
139 | if (level <= ip_vs_get_debug_level()) \ |
140 | pp->debug_packet(pp, skb, ofs, msg); \ |
141 | } while (0) |
142 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ |
143 | do { \ |
144 | if (level <= ip_vs_get_debug_level() && \ |
145 | net_ratelimit()) \ |
146 | pp->debug_packet(pp, skb, ofs, msg); \ |
147 | } while (0) |
148 | #else /* NO DEBUGGING at ALL */ |
149 | #define IP_VS_DBG_BUF(level, msg...) do {} while (0) |
150 | #define IP_VS_ERR_BUF(msg...) do {} while (0) |
151 | #define IP_VS_DBG(level, msg...) do {} while (0) |
152 | #define IP_VS_DBG_RL(msg...) do {} while (0) |
153 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) |
154 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) |
155 | #endif |
156 | |
157 | #define IP_VS_BUG() BUG() |
158 | #define IP_VS_ERR_RL(msg, ...) \ |
159 | do { \ |
160 | if (net_ratelimit()) \ |
161 | pr_err(msg, ##__VA_ARGS__); \ |
162 | } while (0) |
163 | |
164 | #ifdef CONFIG_IP_VS_DEBUG |
165 | #define EnterFunction(level) \ |
166 | do { \ |
167 | if (level <= ip_vs_get_debug_level()) \ |
168 | printk(KERN_DEBUG \ |
169 | pr_fmt("Enter: %s, %s line %i\n"), \ |
170 | __func__, __FILE__, __LINE__); \ |
171 | } while (0) |
172 | #define LeaveFunction(level) \ |
173 | do { \ |
174 | if (level <= ip_vs_get_debug_level()) \ |
175 | printk(KERN_DEBUG \ |
176 | pr_fmt("Leave: %s, %s line %i\n"), \ |
177 | __func__, __FILE__, __LINE__); \ |
178 | } while (0) |
179 | #else |
180 | #define EnterFunction(level) do {} while (0) |
181 | #define LeaveFunction(level) do {} while (0) |
182 | #endif |
183 | |
184 | #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } |
185 | |
186 | |
187 | /* |
188 | * The port number of FTP service (in network order). |
189 | */ |
190 | #define FTPPORT cpu_to_be16(21) |
191 | #define FTPDATA cpu_to_be16(20) |
192 | |
193 | /* |
194 | * TCP State Values |
195 | */ |
196 | enum { |
197 | IP_VS_TCP_S_NONE = 0, |
198 | IP_VS_TCP_S_ESTABLISHED, |
199 | IP_VS_TCP_S_SYN_SENT, |
200 | IP_VS_TCP_S_SYN_RECV, |
201 | IP_VS_TCP_S_FIN_WAIT, |
202 | IP_VS_TCP_S_TIME_WAIT, |
203 | IP_VS_TCP_S_CLOSE, |
204 | IP_VS_TCP_S_CLOSE_WAIT, |
205 | IP_VS_TCP_S_LAST_ACK, |
206 | IP_VS_TCP_S_LISTEN, |
207 | IP_VS_TCP_S_SYNACK, |
208 | IP_VS_TCP_S_LAST |
209 | }; |
210 | |
211 | /* |
212 | * UDP State Values |
213 | */ |
214 | enum { |
215 | IP_VS_UDP_S_NORMAL, |
216 | IP_VS_UDP_S_LAST, |
217 | }; |
218 | |
219 | /* |
220 | * ICMP State Values |
221 | */ |
222 | enum { |
223 | IP_VS_ICMP_S_NORMAL, |
224 | IP_VS_ICMP_S_LAST, |
225 | }; |
226 | |
227 | /* |
228 | * SCTP State Values |
229 | */ |
230 | enum ip_vs_sctp_states { |
231 | IP_VS_SCTP_S_NONE, |
232 | IP_VS_SCTP_S_INIT_CLI, |
233 | IP_VS_SCTP_S_INIT_SER, |
234 | IP_VS_SCTP_S_INIT_ACK_CLI, |
235 | IP_VS_SCTP_S_INIT_ACK_SER, |
236 | IP_VS_SCTP_S_ECHO_CLI, |
237 | IP_VS_SCTP_S_ECHO_SER, |
238 | IP_VS_SCTP_S_ESTABLISHED, |
239 | IP_VS_SCTP_S_SHUT_CLI, |
240 | IP_VS_SCTP_S_SHUT_SER, |
241 | IP_VS_SCTP_S_SHUT_ACK_CLI, |
242 | IP_VS_SCTP_S_SHUT_ACK_SER, |
243 | IP_VS_SCTP_S_CLOSED, |
244 | IP_VS_SCTP_S_LAST |
245 | }; |
246 | |
247 | /* |
248 | * Delta sequence info structure |
249 | * Each ip_vs_conn has 2 (output AND input seq. changes). |
250 | * Only used in the VS/NAT. |
251 | */ |
252 | struct ip_vs_seq { |
253 | __u32 init_seq; /* Add delta from this seq */ |
254 | __u32 delta; /* Delta in sequence numbers */ |
255 | __u32 previous_delta; /* Delta in sequence numbers |
256 | before last resized pkt */ |
257 | }; |
258 | |
259 | |
260 | /* |
261 | * IPVS statistics objects |
262 | */ |
263 | struct ip_vs_estimator { |
264 | struct list_head list; |
265 | |
266 | u64 last_inbytes; |
267 | u64 last_outbytes; |
268 | u32 last_conns; |
269 | u32 last_inpkts; |
270 | u32 last_outpkts; |
271 | |
272 | u32 cps; |
273 | u32 inpps; |
274 | u32 outpps; |
275 | u32 inbps; |
276 | u32 outbps; |
277 | }; |
278 | |
279 | struct ip_vs_stats { |
280 | struct ip_vs_stats_user ustats; /* statistics */ |
281 | struct ip_vs_estimator est; /* estimator */ |
282 | |
283 | spinlock_t lock; /* spin lock */ |
284 | }; |
285 | |
286 | struct dst_entry; |
287 | struct iphdr; |
288 | struct ip_vs_conn; |
289 | struct ip_vs_app; |
290 | struct sk_buff; |
291 | |
292 | struct ip_vs_protocol { |
293 | struct ip_vs_protocol *next; |
294 | char *name; |
295 | u16 protocol; |
296 | u16 num_states; |
297 | int dont_defrag; |
298 | atomic_t appcnt; /* counter of proto app incs */ |
299 | int *timeout_table; /* protocol timeout table */ |
300 | |
301 | void (*init)(struct ip_vs_protocol *pp); |
302 | |
303 | void (*exit)(struct ip_vs_protocol *pp); |
304 | |
305 | int (*conn_schedule)(int af, struct sk_buff *skb, |
306 | struct ip_vs_protocol *pp, |
307 | int *verdict, struct ip_vs_conn **cpp); |
308 | |
309 | struct ip_vs_conn * |
310 | (*conn_in_get)(int af, |
311 | const struct sk_buff *skb, |
312 | struct ip_vs_protocol *pp, |
313 | const struct ip_vs_iphdr *iph, |
314 | unsigned int proto_off, |
315 | int inverse); |
316 | |
317 | struct ip_vs_conn * |
318 | (*conn_out_get)(int af, |
319 | const struct sk_buff *skb, |
320 | struct ip_vs_protocol *pp, |
321 | const struct ip_vs_iphdr *iph, |
322 | unsigned int proto_off, |
323 | int inverse); |
324 | |
325 | int (*snat_handler)(struct sk_buff *skb, |
326 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
327 | |
328 | int (*dnat_handler)(struct sk_buff *skb, |
329 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
330 | |
331 | int (*csum_check)(int af, struct sk_buff *skb, |
332 | struct ip_vs_protocol *pp); |
333 | |
334 | const char *(*state_name)(int state); |
335 | |
336 | int (*state_transition)(struct ip_vs_conn *cp, int direction, |
337 | const struct sk_buff *skb, |
338 | struct ip_vs_protocol *pp); |
339 | |
340 | int (*register_app)(struct ip_vs_app *inc); |
341 | |
342 | void (*unregister_app)(struct ip_vs_app *inc); |
343 | |
344 | int (*app_conn_bind)(struct ip_vs_conn *cp); |
345 | |
346 | void (*debug_packet)(struct ip_vs_protocol *pp, |
347 | const struct sk_buff *skb, |
348 | int offset, |
349 | const char *msg); |
350 | |
351 | void (*timeout_change)(struct ip_vs_protocol *pp, int flags); |
352 | |
353 | int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); |
354 | }; |
355 | |
356 | extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); |
357 | |
358 | /* |
359 | * IP_VS structure allocated for each dynamically scheduled connection |
360 | */ |
361 | struct ip_vs_conn { |
362 | struct list_head c_list; /* hashed list heads */ |
363 | |
364 | /* Protocol, addresses and port numbers */ |
365 | u16 af; /* address family */ |
366 | union nf_inet_addr caddr; /* client address */ |
367 | union nf_inet_addr vaddr; /* virtual address */ |
368 | union nf_inet_addr daddr; /* destination address */ |
369 | __be16 cport; |
370 | __be16 vport; |
371 | __be16 dport; |
372 | __u16 protocol; /* Which protocol (TCP/UDP) */ |
373 | |
374 | /* counter and timer */ |
375 | atomic_t refcnt; /* reference count */ |
376 | struct timer_list timer; /* Expiration timer */ |
377 | volatile unsigned long timeout; /* timeout */ |
378 | |
379 | /* Flags and state transition */ |
380 | spinlock_t lock; /* lock for state transition */ |
381 | volatile __u16 flags; /* status flags */ |
382 | volatile __u16 state; /* state info */ |
383 | volatile __u16 old_state; /* old state, to be used for |
384 | * state transition triggerd |
385 | * synchronization |
386 | */ |
387 | |
388 | /* Control members */ |
389 | struct ip_vs_conn *control; /* Master control connection */ |
390 | atomic_t n_control; /* Number of controlled ones */ |
391 | struct ip_vs_dest *dest; /* real server */ |
392 | atomic_t in_pkts; /* incoming packet counter */ |
393 | |
394 | /* packet transmitter for different forwarding methods. If it |
395 | mangles the packet, it must return NF_DROP or better NF_STOLEN, |
396 | otherwise this must be changed to a sk_buff **. |
397 | */ |
398 | int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, |
399 | struct ip_vs_protocol *pp); |
400 | |
401 | /* Note: we can group the following members into a structure, |
402 | in order to save more space, and the following members are |
403 | only used in VS/NAT anyway */ |
404 | struct ip_vs_app *app; /* bound ip_vs_app object */ |
405 | void *app_data; /* Application private data */ |
406 | struct ip_vs_seq in_seq; /* incoming seq. struct */ |
407 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ |
408 | }; |
409 | |
410 | |
411 | /* |
412 | * Extended internal versions of struct ip_vs_service_user and |
413 | * ip_vs_dest_user for IPv6 support. |
414 | * |
415 | * We need these to conveniently pass around service and destination |
416 | * options, but unfortunately, we also need to keep the old definitions to |
417 | * maintain userspace backwards compatibility for the setsockopt interface. |
418 | */ |
419 | struct ip_vs_service_user_kern { |
420 | /* virtual service addresses */ |
421 | u16 af; |
422 | u16 protocol; |
423 | union nf_inet_addr addr; /* virtual ip address */ |
424 | u16 port; |
425 | u32 fwmark; /* firwall mark of service */ |
426 | |
427 | /* virtual service options */ |
428 | char *sched_name; |
429 | unsigned flags; /* virtual service flags */ |
430 | unsigned timeout; /* persistent timeout in sec */ |
431 | u32 netmask; /* persistent netmask */ |
432 | }; |
433 | |
434 | |
435 | struct ip_vs_dest_user_kern { |
436 | /* destination server address */ |
437 | union nf_inet_addr addr; |
438 | u16 port; |
439 | |
440 | /* real server options */ |
441 | unsigned conn_flags; /* connection flags */ |
442 | int weight; /* destination weight */ |
443 | |
444 | /* thresholds for active connections */ |
445 | u32 u_threshold; /* upper threshold */ |
446 | u32 l_threshold; /* lower threshold */ |
447 | }; |
448 | |
449 | |
450 | /* |
451 | * The information about the virtual service offered to the net |
452 | * and the forwarding entries |
453 | */ |
454 | struct ip_vs_service { |
455 | struct list_head s_list; /* for normal service table */ |
456 | struct list_head f_list; /* for fwmark-based service table */ |
457 | atomic_t refcnt; /* reference counter */ |
458 | atomic_t usecnt; /* use counter */ |
459 | |
460 | u16 af; /* address family */ |
461 | __u16 protocol; /* which protocol (TCP/UDP) */ |
462 | union nf_inet_addr addr; /* IP address for virtual service */ |
463 | __be16 port; /* port number for the service */ |
464 | __u32 fwmark; /* firewall mark of the service */ |
465 | unsigned flags; /* service status flags */ |
466 | unsigned timeout; /* persistent timeout in ticks */ |
467 | __be32 netmask; /* grouping granularity */ |
468 | |
469 | struct list_head destinations; /* real server d-linked list */ |
470 | __u32 num_dests; /* number of servers */ |
471 | struct ip_vs_stats stats; /* statistics for the service */ |
472 | struct ip_vs_app *inc; /* bind conns to this app inc */ |
473 | |
474 | /* for scheduling */ |
475 | struct ip_vs_scheduler *scheduler; /* bound scheduler object */ |
476 | rwlock_t sched_lock; /* lock sched_data */ |
477 | void *sched_data; /* scheduler application data */ |
478 | }; |
479 | |
480 | |
481 | /* |
482 | * The real server destination forwarding entry |
483 | * with ip address, port number, and so on. |
484 | */ |
485 | struct ip_vs_dest { |
486 | struct list_head n_list; /* for the dests in the service */ |
487 | struct list_head d_list; /* for table with all the dests */ |
488 | |
489 | u16 af; /* address family */ |
490 | union nf_inet_addr addr; /* IP address of the server */ |
491 | __be16 port; /* port number of the server */ |
492 | volatile unsigned flags; /* dest status flags */ |
493 | atomic_t conn_flags; /* flags to copy to conn */ |
494 | atomic_t weight; /* server weight */ |
495 | |
496 | atomic_t refcnt; /* reference counter */ |
497 | struct ip_vs_stats stats; /* statistics */ |
498 | |
499 | /* connection counters and thresholds */ |
500 | atomic_t activeconns; /* active connections */ |
501 | atomic_t inactconns; /* inactive connections */ |
502 | atomic_t persistconns; /* persistent connections */ |
503 | __u32 u_threshold; /* upper threshold */ |
504 | __u32 l_threshold; /* lower threshold */ |
505 | |
506 | /* for destination cache */ |
507 | spinlock_t dst_lock; /* lock of dst_cache */ |
508 | struct dst_entry *dst_cache; /* destination cache entry */ |
509 | u32 dst_rtos; /* RT_TOS(tos) for dst */ |
510 | |
511 | /* for virtual service */ |
512 | struct ip_vs_service *svc; /* service it belongs to */ |
513 | __u16 protocol; /* which protocol (TCP/UDP) */ |
514 | union nf_inet_addr vaddr; /* virtual IP address */ |
515 | __be16 vport; /* virtual port number */ |
516 | __u32 vfwmark; /* firewall mark of service */ |
517 | }; |
518 | |
519 | |
520 | /* |
521 | * The scheduler object |
522 | */ |
523 | struct ip_vs_scheduler { |
524 | struct list_head n_list; /* d-linked list head */ |
525 | char *name; /* scheduler name */ |
526 | atomic_t refcnt; /* reference counter */ |
527 | struct module *module; /* THIS_MODULE/NULL */ |
528 | |
529 | /* scheduler initializing service */ |
530 | int (*init_service)(struct ip_vs_service *svc); |
531 | /* scheduling service finish */ |
532 | int (*done_service)(struct ip_vs_service *svc); |
533 | /* scheduler updating service */ |
534 | int (*update_service)(struct ip_vs_service *svc); |
535 | |
536 | /* selecting a server from the given service */ |
537 | struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, |
538 | const struct sk_buff *skb); |
539 | }; |
540 | |
541 | |
542 | /* |
543 | * The application module object (a.k.a. app incarnation) |
544 | */ |
545 | struct ip_vs_app { |
546 | struct list_head a_list; /* member in app list */ |
547 | int type; /* IP_VS_APP_TYPE_xxx */ |
548 | char *name; /* application module name */ |
549 | __u16 protocol; |
550 | struct module *module; /* THIS_MODULE/NULL */ |
551 | struct list_head incs_list; /* list of incarnations */ |
552 | |
553 | /* members for application incarnations */ |
554 | struct list_head p_list; /* member in proto app list */ |
555 | struct ip_vs_app *app; /* its real application */ |
556 | __be16 port; /* port number in net order */ |
557 | atomic_t usecnt; /* usage counter */ |
558 | |
559 | /* output hook: return false if can't linearize. diff set for TCP. */ |
560 | int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, |
561 | struct sk_buff *, int *diff); |
562 | |
563 | /* input hook: return false if can't linearize. diff set for TCP. */ |
564 | int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, |
565 | struct sk_buff *, int *diff); |
566 | |
567 | /* ip_vs_app initializer */ |
568 | int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); |
569 | |
570 | /* ip_vs_app finish */ |
571 | int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); |
572 | |
573 | |
574 | /* not used now */ |
575 | int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, |
576 | struct ip_vs_protocol *); |
577 | |
578 | void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); |
579 | |
580 | int * timeout_table; |
581 | int * timeouts; |
582 | int timeouts_size; |
583 | |
584 | int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, |
585 | int *verdict, struct ip_vs_conn **cpp); |
586 | |
587 | struct ip_vs_conn * |
588 | (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, |
589 | const struct iphdr *iph, unsigned int proto_off, |
590 | int inverse); |
591 | |
592 | struct ip_vs_conn * |
593 | (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, |
594 | const struct iphdr *iph, unsigned int proto_off, |
595 | int inverse); |
596 | |
597 | int (*state_transition)(struct ip_vs_conn *cp, int direction, |
598 | const struct sk_buff *skb, |
599 | struct ip_vs_app *app); |
600 | |
601 | void (*timeout_change)(struct ip_vs_app *app, int flags); |
602 | }; |
603 | |
604 | |
605 | /* |
606 | * IPVS core functions |
607 | * (from ip_vs_core.c) |
608 | */ |
609 | extern const char *ip_vs_proto_name(unsigned proto); |
610 | extern void ip_vs_init_hash_table(struct list_head *table, int rows); |
611 | #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) |
612 | |
613 | #define IP_VS_APP_TYPE_FTP 1 |
614 | |
615 | /* |
616 | * ip_vs_conn handling functions |
617 | * (from ip_vs_conn.c) |
618 | */ |
619 | |
620 | enum { |
621 | IP_VS_DIR_INPUT = 0, |
622 | IP_VS_DIR_OUTPUT, |
623 | IP_VS_DIR_INPUT_ONLY, |
624 | IP_VS_DIR_LAST, |
625 | }; |
626 | |
627 | extern struct ip_vs_conn *ip_vs_conn_in_get |
628 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
629 | const union nf_inet_addr *d_addr, __be16 d_port); |
630 | |
631 | extern struct ip_vs_conn *ip_vs_ct_in_get |
632 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
633 | const union nf_inet_addr *d_addr, __be16 d_port); |
634 | |
635 | extern struct ip_vs_conn *ip_vs_conn_out_get |
636 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
637 | const union nf_inet_addr *d_addr, __be16 d_port); |
638 | |
639 | /* put back the conn without restarting its timer */ |
640 | static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) |
641 | { |
642 | atomic_dec(&cp->refcnt); |
643 | } |
644 | extern void ip_vs_conn_put(struct ip_vs_conn *cp); |
645 | extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); |
646 | |
647 | extern struct ip_vs_conn * |
648 | ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport, |
649 | const union nf_inet_addr *vaddr, __be16 vport, |
650 | const union nf_inet_addr *daddr, __be16 dport, unsigned flags, |
651 | struct ip_vs_dest *dest); |
652 | extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); |
653 | |
654 | extern const char * ip_vs_state_name(__u16 proto, int state); |
655 | |
656 | extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); |
657 | extern int ip_vs_check_template(struct ip_vs_conn *ct); |
658 | extern void ip_vs_random_dropentry(void); |
659 | extern int ip_vs_conn_init(void); |
660 | extern void ip_vs_conn_cleanup(void); |
661 | |
662 | static inline void ip_vs_control_del(struct ip_vs_conn *cp) |
663 | { |
664 | struct ip_vs_conn *ctl_cp = cp->control; |
665 | if (!ctl_cp) { |
666 | IP_VS_ERR_BUF("request control DEL for uncontrolled: " |
667 | "%s:%d to %s:%d\n", |
668 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
669 | ntohs(cp->cport), |
670 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
671 | ntohs(cp->vport)); |
672 | |
673 | return; |
674 | } |
675 | |
676 | IP_VS_DBG_BUF(7, "DELeting control for: " |
677 | "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", |
678 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
679 | ntohs(cp->cport), |
680 | IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), |
681 | ntohs(ctl_cp->cport)); |
682 | |
683 | cp->control = NULL; |
684 | if (atomic_read(&ctl_cp->n_control) == 0) { |
685 | IP_VS_ERR_BUF("BUG control DEL with n=0 : " |
686 | "%s:%d to %s:%d\n", |
687 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
688 | ntohs(cp->cport), |
689 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
690 | ntohs(cp->vport)); |
691 | |
692 | return; |
693 | } |
694 | atomic_dec(&ctl_cp->n_control); |
695 | } |
696 | |
697 | static inline void |
698 | ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) |
699 | { |
700 | if (cp->control) { |
701 | IP_VS_ERR_BUF("request control ADD for already controlled: " |
702 | "%s:%d to %s:%d\n", |
703 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
704 | ntohs(cp->cport), |
705 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
706 | ntohs(cp->vport)); |
707 | |
708 | ip_vs_control_del(cp); |
709 | } |
710 | |
711 | IP_VS_DBG_BUF(7, "ADDing control for: " |
712 | "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", |
713 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
714 | ntohs(cp->cport), |
715 | IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), |
716 | ntohs(ctl_cp->cport)); |
717 | |
718 | cp->control = ctl_cp; |
719 | atomic_inc(&ctl_cp->n_control); |
720 | } |
721 | |
722 | |
723 | /* |
724 | * IPVS application functions |
725 | * (from ip_vs_app.c) |
726 | */ |
727 | #define IP_VS_APP_MAX_PORTS 8 |
728 | extern int register_ip_vs_app(struct ip_vs_app *app); |
729 | extern void unregister_ip_vs_app(struct ip_vs_app *app); |
730 | extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
731 | extern void ip_vs_unbind_app(struct ip_vs_conn *cp); |
732 | extern int |
733 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); |
734 | extern int ip_vs_app_inc_get(struct ip_vs_app *inc); |
735 | extern void ip_vs_app_inc_put(struct ip_vs_app *inc); |
736 | |
737 | extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); |
738 | extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); |
739 | extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
740 | char *o_buf, int o_len, char *n_buf, int n_len); |
741 | extern int ip_vs_app_init(void); |
742 | extern void ip_vs_app_cleanup(void); |
743 | |
744 | |
745 | /* |
746 | * IPVS protocol functions (from ip_vs_proto.c) |
747 | */ |
748 | extern int ip_vs_protocol_init(void); |
749 | extern void ip_vs_protocol_cleanup(void); |
750 | extern void ip_vs_protocol_timeout_change(int flags); |
751 | extern int *ip_vs_create_timeout_table(int *table, int size); |
752 | extern int |
753 | ip_vs_set_state_timeout(int *table, int num, const char *const *names, |
754 | const char *name, int to); |
755 | extern void |
756 | ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, |
757 | int offset, const char *msg); |
758 | |
759 | extern struct ip_vs_protocol ip_vs_protocol_tcp; |
760 | extern struct ip_vs_protocol ip_vs_protocol_udp; |
761 | extern struct ip_vs_protocol ip_vs_protocol_icmp; |
762 | extern struct ip_vs_protocol ip_vs_protocol_esp; |
763 | extern struct ip_vs_protocol ip_vs_protocol_ah; |
764 | extern struct ip_vs_protocol ip_vs_protocol_sctp; |
765 | |
766 | /* |
767 | * Registering/unregistering scheduler functions |
768 | * (from ip_vs_sched.c) |
769 | */ |
770 | extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); |
771 | extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); |
772 | extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, |
773 | struct ip_vs_scheduler *scheduler); |
774 | extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); |
775 | extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); |
776 | extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); |
777 | extern struct ip_vs_conn * |
778 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); |
779 | extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, |
780 | struct ip_vs_protocol *pp); |
781 | |
782 | |
783 | /* |
784 | * IPVS control data and functions (from ip_vs_ctl.c) |
785 | */ |
786 | extern int sysctl_ip_vs_cache_bypass; |
787 | extern int sysctl_ip_vs_expire_nodest_conn; |
788 | extern int sysctl_ip_vs_expire_quiescent_template; |
789 | extern int sysctl_ip_vs_sync_threshold[2]; |
790 | extern int sysctl_ip_vs_nat_icmp_send; |
791 | extern struct ip_vs_stats ip_vs_stats; |
792 | extern const struct ctl_path net_vs_ctl_path[]; |
793 | |
794 | extern struct ip_vs_service * |
795 | ip_vs_service_get(int af, __u32 fwmark, __u16 protocol, |
796 | const union nf_inet_addr *vaddr, __be16 vport); |
797 | |
798 | static inline void ip_vs_service_put(struct ip_vs_service *svc) |
799 | { |
800 | atomic_dec(&svc->usecnt); |
801 | } |
802 | |
803 | extern struct ip_vs_dest * |
804 | ip_vs_lookup_real_service(int af, __u16 protocol, |
805 | const union nf_inet_addr *daddr, __be16 dport); |
806 | |
807 | extern int ip_vs_use_count_inc(void); |
808 | extern void ip_vs_use_count_dec(void); |
809 | extern int ip_vs_control_init(void); |
810 | extern void ip_vs_control_cleanup(void); |
811 | extern struct ip_vs_dest * |
812 | ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport, |
813 | const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol); |
814 | extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); |
815 | |
816 | |
817 | /* |
818 | * IPVS sync daemon data and function prototypes |
819 | * (from ip_vs_sync.c) |
820 | */ |
821 | extern volatile int ip_vs_sync_state; |
822 | extern volatile int ip_vs_master_syncid; |
823 | extern volatile int ip_vs_backup_syncid; |
824 | extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; |
825 | extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; |
826 | extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); |
827 | extern int stop_sync_thread(int state); |
828 | extern void ip_vs_sync_conn(struct ip_vs_conn *cp); |
829 | |
830 | |
831 | /* |
832 | * IPVS rate estimator prototypes (from ip_vs_est.c) |
833 | */ |
834 | extern int ip_vs_estimator_init(void); |
835 | extern void ip_vs_estimator_cleanup(void); |
836 | extern void ip_vs_new_estimator(struct ip_vs_stats *stats); |
837 | extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); |
838 | extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); |
839 | |
840 | /* |
841 | * Various IPVS packet transmitters (from ip_vs_xmit.c) |
842 | */ |
843 | extern int ip_vs_null_xmit |
844 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
845 | extern int ip_vs_bypass_xmit |
846 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
847 | extern int ip_vs_nat_xmit |
848 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
849 | extern int ip_vs_tunnel_xmit |
850 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
851 | extern int ip_vs_dr_xmit |
852 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
853 | extern int ip_vs_icmp_xmit |
854 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); |
855 | extern void ip_vs_dst_reset(struct ip_vs_dest *dest); |
856 | |
857 | #ifdef CONFIG_IP_VS_IPV6 |
858 | extern int ip_vs_bypass_xmit_v6 |
859 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
860 | extern int ip_vs_nat_xmit_v6 |
861 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
862 | extern int ip_vs_tunnel_xmit_v6 |
863 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
864 | extern int ip_vs_dr_xmit_v6 |
865 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
866 | extern int ip_vs_icmp_xmit_v6 |
867 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, |
868 | int offset); |
869 | #endif |
870 | |
871 | /* |
872 | * This is a simple mechanism to ignore packets when |
873 | * we are loaded. Just set ip_vs_drop_rate to 'n' and |
874 | * we start to drop 1/rate of the packets |
875 | */ |
876 | extern int ip_vs_drop_rate; |
877 | extern int ip_vs_drop_counter; |
878 | |
879 | static __inline__ int ip_vs_todrop(void) |
880 | { |
881 | if (!ip_vs_drop_rate) return 0; |
882 | if (--ip_vs_drop_counter > 0) return 0; |
883 | ip_vs_drop_counter = ip_vs_drop_rate; |
884 | return 1; |
885 | } |
886 | |
887 | /* |
888 | * ip_vs_fwd_tag returns the forwarding tag of the connection |
889 | */ |
890 | #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) |
891 | |
892 | static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) |
893 | { |
894 | char fwd; |
895 | |
896 | switch (IP_VS_FWD_METHOD(cp)) { |
897 | case IP_VS_CONN_F_MASQ: |
898 | fwd = 'M'; break; |
899 | case IP_VS_CONN_F_LOCALNODE: |
900 | fwd = 'L'; break; |
901 | case IP_VS_CONN_F_TUNNEL: |
902 | fwd = 'T'; break; |
903 | case IP_VS_CONN_F_DROUTE: |
904 | fwd = 'R'; break; |
905 | case IP_VS_CONN_F_BYPASS: |
906 | fwd = 'B'; break; |
907 | default: |
908 | fwd = '?'; break; |
909 | } |
910 | return fwd; |
911 | } |
912 | |
913 | extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
914 | struct ip_vs_conn *cp, int dir); |
915 | |
916 | #ifdef CONFIG_IP_VS_IPV6 |
917 | extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, |
918 | struct ip_vs_conn *cp, int dir); |
919 | #endif |
920 | |
921 | extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); |
922 | |
923 | static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) |
924 | { |
925 | __be32 diff[2] = { ~old, new }; |
926 | |
927 | return csum_partial(diff, sizeof(diff), oldsum); |
928 | } |
929 | |
930 | #ifdef CONFIG_IP_VS_IPV6 |
931 | static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, |
932 | __wsum oldsum) |
933 | { |
934 | __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], |
935 | new[3], new[2], new[1], new[0] }; |
936 | |
937 | return csum_partial(diff, sizeof(diff), oldsum); |
938 | } |
939 | #endif |
940 | |
941 | static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) |
942 | { |
943 | __be16 diff[2] = { ~old, new }; |
944 | |
945 | return csum_partial(diff, sizeof(diff), oldsum); |
946 | } |
947 | |
948 | #endif /* __KERNEL__ */ |
949 | |
950 | #endif /* _NET_IP_VS_H */ |
951 |
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