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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 | #include <asm/types.h> /* for __uXX types */ |
12 | |
13 | #include <linux/sysctl.h> /* for ctl_path */ |
14 | #include <linux/list.h> /* for struct list_head */ |
15 | #include <linux/spinlock.h> /* for struct rwlock_t */ |
16 | #include <asm/atomic.h> /* for struct atomic_t */ |
17 | #include <linux/compiler.h> |
18 | #include <linux/timer.h> |
19 | |
20 | #include <net/checksum.h> |
21 | #include <linux/netfilter.h> /* for union nf_inet_addr */ |
22 | #include <linux/ip.h> |
23 | #include <linux/ipv6.h> /* for struct ipv6hdr */ |
24 | #include <net/ipv6.h> /* for ipv6_addr_copy */ |
25 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
26 | #include <net/netfilter/nf_conntrack.h> |
27 | #endif |
28 | #include <net/net_namespace.h> /* Netw namespace */ |
29 | |
30 | /* |
31 | * Generic access of ipvs struct |
32 | */ |
33 | static inline struct netns_ipvs *net_ipvs(struct net* net) |
34 | { |
35 | return net->ipvs; |
36 | } |
37 | /* |
38 | * Get net ptr from skb in traffic cases |
39 | * use skb_sknet when call is from userland (ioctl or netlink) |
40 | */ |
41 | static inline struct net *skb_net(const struct sk_buff *skb) |
42 | { |
43 | #ifdef CONFIG_NET_NS |
44 | #ifdef CONFIG_IP_VS_DEBUG |
45 | /* |
46 | * This is used for debug only. |
47 | * Start with the most likely hit |
48 | * End with BUG |
49 | */ |
50 | if (likely(skb->dev && skb->dev->nd_net)) |
51 | return dev_net(skb->dev); |
52 | if (skb_dst(skb) && skb_dst(skb)->dev) |
53 | return dev_net(skb_dst(skb)->dev); |
54 | WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n", |
55 | __func__, __LINE__); |
56 | if (likely(skb->sk && skb->sk->sk_net)) |
57 | return sock_net(skb->sk); |
58 | pr_err("There is no net ptr to find in the skb in %s() line:%d\n", |
59 | __func__, __LINE__); |
60 | BUG(); |
61 | #else |
62 | return dev_net(skb->dev ? : skb_dst(skb)->dev); |
63 | #endif |
64 | #else |
65 | return &init_net; |
66 | #endif |
67 | } |
68 | |
69 | static inline struct net *skb_sknet(const struct sk_buff *skb) |
70 | { |
71 | #ifdef CONFIG_NET_NS |
72 | #ifdef CONFIG_IP_VS_DEBUG |
73 | /* Start with the most likely hit */ |
74 | if (likely(skb->sk && skb->sk->sk_net)) |
75 | return sock_net(skb->sk); |
76 | WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n", |
77 | __func__, __LINE__); |
78 | if (likely(skb->dev && skb->dev->nd_net)) |
79 | return dev_net(skb->dev); |
80 | pr_err("There is no net ptr to find in the skb in %s() line:%d\n", |
81 | __func__, __LINE__); |
82 | BUG(); |
83 | #else |
84 | return sock_net(skb->sk); |
85 | #endif |
86 | #else |
87 | return &init_net; |
88 | #endif |
89 | } |
90 | /* |
91 | * This one needed for single_open_net since net is stored directly in |
92 | * private not as a struct i.e. seq_file_net can't be used. |
93 | */ |
94 | static inline struct net *seq_file_single_net(struct seq_file *seq) |
95 | { |
96 | #ifdef CONFIG_NET_NS |
97 | return (struct net *)seq->private; |
98 | #else |
99 | return &init_net; |
100 | #endif |
101 | } |
102 | |
103 | /* Connections' size value needed by ip_vs_ctl.c */ |
104 | extern int ip_vs_conn_tab_size; |
105 | |
106 | |
107 | struct ip_vs_iphdr { |
108 | int len; |
109 | __u8 protocol; |
110 | union nf_inet_addr saddr; |
111 | union nf_inet_addr daddr; |
112 | }; |
113 | |
114 | static inline void |
115 | ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr) |
116 | { |
117 | #ifdef CONFIG_IP_VS_IPV6 |
118 | if (af == AF_INET6) { |
119 | const struct ipv6hdr *iph = nh; |
120 | iphdr->len = sizeof(struct ipv6hdr); |
121 | iphdr->protocol = iph->nexthdr; |
122 | ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr); |
123 | ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr); |
124 | } else |
125 | #endif |
126 | { |
127 | const struct iphdr *iph = nh; |
128 | iphdr->len = iph->ihl * 4; |
129 | iphdr->protocol = iph->protocol; |
130 | iphdr->saddr.ip = iph->saddr; |
131 | iphdr->daddr.ip = iph->daddr; |
132 | } |
133 | } |
134 | |
135 | static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, |
136 | const union nf_inet_addr *src) |
137 | { |
138 | #ifdef CONFIG_IP_VS_IPV6 |
139 | if (af == AF_INET6) |
140 | ipv6_addr_copy(&dst->in6, &src->in6); |
141 | else |
142 | #endif |
143 | dst->ip = src->ip; |
144 | } |
145 | |
146 | static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, |
147 | const union nf_inet_addr *b) |
148 | { |
149 | #ifdef CONFIG_IP_VS_IPV6 |
150 | if (af == AF_INET6) |
151 | return ipv6_addr_equal(&a->in6, &b->in6); |
152 | #endif |
153 | return a->ip == b->ip; |
154 | } |
155 | |
156 | #ifdef CONFIG_IP_VS_DEBUG |
157 | #include <linux/net.h> |
158 | |
159 | extern int ip_vs_get_debug_level(void); |
160 | |
161 | static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, |
162 | const union nf_inet_addr *addr, |
163 | int *idx) |
164 | { |
165 | int len; |
166 | #ifdef CONFIG_IP_VS_IPV6 |
167 | if (af == AF_INET6) |
168 | len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]", |
169 | &addr->in6) + 1; |
170 | else |
171 | #endif |
172 | len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", |
173 | &addr->ip) + 1; |
174 | |
175 | *idx += len; |
176 | BUG_ON(*idx > buf_len + 1); |
177 | return &buf[*idx - len]; |
178 | } |
179 | |
180 | #define IP_VS_DBG_BUF(level, msg, ...) \ |
181 | do { \ |
182 | char ip_vs_dbg_buf[160]; \ |
183 | int ip_vs_dbg_idx = 0; \ |
184 | if (level <= ip_vs_get_debug_level()) \ |
185 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ |
186 | } while (0) |
187 | #define IP_VS_ERR_BUF(msg...) \ |
188 | do { \ |
189 | char ip_vs_dbg_buf[160]; \ |
190 | int ip_vs_dbg_idx = 0; \ |
191 | pr_err(msg); \ |
192 | } while (0) |
193 | |
194 | /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ |
195 | #define IP_VS_DBG_ADDR(af, addr) \ |
196 | ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ |
197 | sizeof(ip_vs_dbg_buf), addr, \ |
198 | &ip_vs_dbg_idx) |
199 | |
200 | #define IP_VS_DBG(level, msg, ...) \ |
201 | do { \ |
202 | if (level <= ip_vs_get_debug_level()) \ |
203 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ |
204 | } while (0) |
205 | #define IP_VS_DBG_RL(msg, ...) \ |
206 | do { \ |
207 | if (net_ratelimit()) \ |
208 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ |
209 | } while (0) |
210 | #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ |
211 | do { \ |
212 | if (level <= ip_vs_get_debug_level()) \ |
213 | pp->debug_packet(af, pp, skb, ofs, msg); \ |
214 | } while (0) |
215 | #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ |
216 | do { \ |
217 | if (level <= ip_vs_get_debug_level() && \ |
218 | net_ratelimit()) \ |
219 | pp->debug_packet(af, pp, skb, ofs, msg); \ |
220 | } while (0) |
221 | #else /* NO DEBUGGING at ALL */ |
222 | #define IP_VS_DBG_BUF(level, msg...) do {} while (0) |
223 | #define IP_VS_ERR_BUF(msg...) do {} while (0) |
224 | #define IP_VS_DBG(level, msg...) do {} while (0) |
225 | #define IP_VS_DBG_RL(msg...) do {} while (0) |
226 | #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) |
227 | #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) |
228 | #endif |
229 | |
230 | #define IP_VS_BUG() BUG() |
231 | #define IP_VS_ERR_RL(msg, ...) \ |
232 | do { \ |
233 | if (net_ratelimit()) \ |
234 | pr_err(msg, ##__VA_ARGS__); \ |
235 | } while (0) |
236 | |
237 | #ifdef CONFIG_IP_VS_DEBUG |
238 | #define EnterFunction(level) \ |
239 | do { \ |
240 | if (level <= ip_vs_get_debug_level()) \ |
241 | printk(KERN_DEBUG \ |
242 | pr_fmt("Enter: %s, %s line %i\n"), \ |
243 | __func__, __FILE__, __LINE__); \ |
244 | } while (0) |
245 | #define LeaveFunction(level) \ |
246 | do { \ |
247 | if (level <= ip_vs_get_debug_level()) \ |
248 | printk(KERN_DEBUG \ |
249 | pr_fmt("Leave: %s, %s line %i\n"), \ |
250 | __func__, __FILE__, __LINE__); \ |
251 | } while (0) |
252 | #else |
253 | #define EnterFunction(level) do {} while (0) |
254 | #define LeaveFunction(level) do {} while (0) |
255 | #endif |
256 | |
257 | #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } |
258 | |
259 | |
260 | /* |
261 | * The port number of FTP service (in network order). |
262 | */ |
263 | #define FTPPORT cpu_to_be16(21) |
264 | #define FTPDATA cpu_to_be16(20) |
265 | |
266 | /* |
267 | * TCP State Values |
268 | */ |
269 | enum { |
270 | IP_VS_TCP_S_NONE = 0, |
271 | IP_VS_TCP_S_ESTABLISHED, |
272 | IP_VS_TCP_S_SYN_SENT, |
273 | IP_VS_TCP_S_SYN_RECV, |
274 | IP_VS_TCP_S_FIN_WAIT, |
275 | IP_VS_TCP_S_TIME_WAIT, |
276 | IP_VS_TCP_S_CLOSE, |
277 | IP_VS_TCP_S_CLOSE_WAIT, |
278 | IP_VS_TCP_S_LAST_ACK, |
279 | IP_VS_TCP_S_LISTEN, |
280 | IP_VS_TCP_S_SYNACK, |
281 | IP_VS_TCP_S_LAST |
282 | }; |
283 | |
284 | /* |
285 | * UDP State Values |
286 | */ |
287 | enum { |
288 | IP_VS_UDP_S_NORMAL, |
289 | IP_VS_UDP_S_LAST, |
290 | }; |
291 | |
292 | /* |
293 | * ICMP State Values |
294 | */ |
295 | enum { |
296 | IP_VS_ICMP_S_NORMAL, |
297 | IP_VS_ICMP_S_LAST, |
298 | }; |
299 | |
300 | /* |
301 | * SCTP State Values |
302 | */ |
303 | enum ip_vs_sctp_states { |
304 | IP_VS_SCTP_S_NONE, |
305 | IP_VS_SCTP_S_INIT_CLI, |
306 | IP_VS_SCTP_S_INIT_SER, |
307 | IP_VS_SCTP_S_INIT_ACK_CLI, |
308 | IP_VS_SCTP_S_INIT_ACK_SER, |
309 | IP_VS_SCTP_S_ECHO_CLI, |
310 | IP_VS_SCTP_S_ECHO_SER, |
311 | IP_VS_SCTP_S_ESTABLISHED, |
312 | IP_VS_SCTP_S_SHUT_CLI, |
313 | IP_VS_SCTP_S_SHUT_SER, |
314 | IP_VS_SCTP_S_SHUT_ACK_CLI, |
315 | IP_VS_SCTP_S_SHUT_ACK_SER, |
316 | IP_VS_SCTP_S_CLOSED, |
317 | IP_VS_SCTP_S_LAST |
318 | }; |
319 | |
320 | /* |
321 | * Delta sequence info structure |
322 | * Each ip_vs_conn has 2 (output AND input seq. changes). |
323 | * Only used in the VS/NAT. |
324 | */ |
325 | struct ip_vs_seq { |
326 | __u32 init_seq; /* Add delta from this seq */ |
327 | __u32 delta; /* Delta in sequence numbers */ |
328 | __u32 previous_delta; /* Delta in sequence numbers |
329 | before last resized pkt */ |
330 | }; |
331 | |
332 | /* |
333 | * counters per cpu |
334 | */ |
335 | struct ip_vs_counters { |
336 | __u32 conns; /* connections scheduled */ |
337 | __u32 inpkts; /* incoming packets */ |
338 | __u32 outpkts; /* outgoing packets */ |
339 | __u64 inbytes; /* incoming bytes */ |
340 | __u64 outbytes; /* outgoing bytes */ |
341 | }; |
342 | /* |
343 | * Stats per cpu |
344 | */ |
345 | struct ip_vs_cpu_stats { |
346 | struct ip_vs_counters ustats; |
347 | struct u64_stats_sync syncp; |
348 | }; |
349 | |
350 | /* |
351 | * IPVS statistics objects |
352 | */ |
353 | struct ip_vs_estimator { |
354 | struct list_head list; |
355 | |
356 | u64 last_inbytes; |
357 | u64 last_outbytes; |
358 | u32 last_conns; |
359 | u32 last_inpkts; |
360 | u32 last_outpkts; |
361 | |
362 | u32 cps; |
363 | u32 inpps; |
364 | u32 outpps; |
365 | u32 inbps; |
366 | u32 outbps; |
367 | }; |
368 | |
369 | struct ip_vs_stats { |
370 | struct ip_vs_stats_user ustats; /* statistics */ |
371 | struct ip_vs_estimator est; /* estimator */ |
372 | struct ip_vs_cpu_stats *cpustats; /* per cpu counters */ |
373 | spinlock_t lock; /* spin lock */ |
374 | struct ip_vs_stats_user ustats0; /* reset values */ |
375 | }; |
376 | |
377 | struct dst_entry; |
378 | struct iphdr; |
379 | struct ip_vs_conn; |
380 | struct ip_vs_app; |
381 | struct sk_buff; |
382 | struct ip_vs_proto_data; |
383 | |
384 | struct ip_vs_protocol { |
385 | struct ip_vs_protocol *next; |
386 | char *name; |
387 | u16 protocol; |
388 | u16 num_states; |
389 | int dont_defrag; |
390 | |
391 | void (*init)(struct ip_vs_protocol *pp); |
392 | |
393 | void (*exit)(struct ip_vs_protocol *pp); |
394 | |
395 | void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd); |
396 | |
397 | void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd); |
398 | |
399 | int (*conn_schedule)(int af, struct sk_buff *skb, |
400 | struct ip_vs_proto_data *pd, |
401 | int *verdict, struct ip_vs_conn **cpp); |
402 | |
403 | struct ip_vs_conn * |
404 | (*conn_in_get)(int af, |
405 | const struct sk_buff *skb, |
406 | const struct ip_vs_iphdr *iph, |
407 | unsigned int proto_off, |
408 | int inverse); |
409 | |
410 | struct ip_vs_conn * |
411 | (*conn_out_get)(int af, |
412 | const struct sk_buff *skb, |
413 | const struct ip_vs_iphdr *iph, |
414 | unsigned int proto_off, |
415 | int inverse); |
416 | |
417 | int (*snat_handler)(struct sk_buff *skb, |
418 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
419 | |
420 | int (*dnat_handler)(struct sk_buff *skb, |
421 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
422 | |
423 | int (*csum_check)(int af, struct sk_buff *skb, |
424 | struct ip_vs_protocol *pp); |
425 | |
426 | const char *(*state_name)(int state); |
427 | |
428 | int (*state_transition)(struct ip_vs_conn *cp, int direction, |
429 | const struct sk_buff *skb, |
430 | struct ip_vs_proto_data *pd); |
431 | |
432 | int (*register_app)(struct net *net, struct ip_vs_app *inc); |
433 | |
434 | void (*unregister_app)(struct net *net, struct ip_vs_app *inc); |
435 | |
436 | int (*app_conn_bind)(struct ip_vs_conn *cp); |
437 | |
438 | void (*debug_packet)(int af, struct ip_vs_protocol *pp, |
439 | const struct sk_buff *skb, |
440 | int offset, |
441 | const char *msg); |
442 | |
443 | void (*timeout_change)(struct ip_vs_proto_data *pd, int flags); |
444 | }; |
445 | |
446 | /* |
447 | * protocol data per netns |
448 | */ |
449 | struct ip_vs_proto_data { |
450 | struct ip_vs_proto_data *next; |
451 | struct ip_vs_protocol *pp; |
452 | int *timeout_table; /* protocol timeout table */ |
453 | atomic_t appcnt; /* counter of proto app incs. */ |
454 | struct tcp_states_t *tcp_state_table; |
455 | }; |
456 | |
457 | extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); |
458 | extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net, |
459 | unsigned short proto); |
460 | |
461 | struct ip_vs_conn_param { |
462 | struct net *net; |
463 | const union nf_inet_addr *caddr; |
464 | const union nf_inet_addr *vaddr; |
465 | __be16 cport; |
466 | __be16 vport; |
467 | __u16 protocol; |
468 | u16 af; |
469 | |
470 | const struct ip_vs_pe *pe; |
471 | char *pe_data; |
472 | __u8 pe_data_len; |
473 | }; |
474 | |
475 | /* |
476 | * IP_VS structure allocated for each dynamically scheduled connection |
477 | */ |
478 | struct ip_vs_conn { |
479 | struct hlist_node c_list; /* hashed list heads */ |
480 | #ifdef CONFIG_NET_NS |
481 | struct net *net; /* Name space */ |
482 | #endif |
483 | /* Protocol, addresses and port numbers */ |
484 | u16 af; /* address family */ |
485 | __be16 cport; |
486 | __be16 vport; |
487 | __be16 dport; |
488 | __u32 fwmark; /* Fire wall mark from skb */ |
489 | union nf_inet_addr caddr; /* client address */ |
490 | union nf_inet_addr vaddr; /* virtual address */ |
491 | union nf_inet_addr daddr; /* destination address */ |
492 | volatile __u32 flags; /* status flags */ |
493 | __u16 protocol; /* Which protocol (TCP/UDP) */ |
494 | |
495 | /* counter and timer */ |
496 | atomic_t refcnt; /* reference count */ |
497 | struct timer_list timer; /* Expiration timer */ |
498 | volatile unsigned long timeout; /* timeout */ |
499 | |
500 | /* Flags and state transition */ |
501 | spinlock_t lock; /* lock for state transition */ |
502 | volatile __u16 state; /* state info */ |
503 | volatile __u16 old_state; /* old state, to be used for |
504 | * state transition triggerd |
505 | * synchronization |
506 | */ |
507 | |
508 | /* Control members */ |
509 | struct ip_vs_conn *control; /* Master control connection */ |
510 | atomic_t n_control; /* Number of controlled ones */ |
511 | struct ip_vs_dest *dest; /* real server */ |
512 | atomic_t in_pkts; /* incoming packet counter */ |
513 | |
514 | /* packet transmitter for different forwarding methods. If it |
515 | mangles the packet, it must return NF_DROP or better NF_STOLEN, |
516 | otherwise this must be changed to a sk_buff **. |
517 | NF_ACCEPT can be returned when destination is local. |
518 | */ |
519 | int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, |
520 | struct ip_vs_protocol *pp); |
521 | |
522 | /* Note: we can group the following members into a structure, |
523 | in order to save more space, and the following members are |
524 | only used in VS/NAT anyway */ |
525 | struct ip_vs_app *app; /* bound ip_vs_app object */ |
526 | void *app_data; /* Application private data */ |
527 | struct ip_vs_seq in_seq; /* incoming seq. struct */ |
528 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ |
529 | |
530 | const struct ip_vs_pe *pe; |
531 | char *pe_data; |
532 | __u8 pe_data_len; |
533 | }; |
534 | |
535 | /* |
536 | * To save some memory in conn table when name space is disabled. |
537 | */ |
538 | static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp) |
539 | { |
540 | #ifdef CONFIG_NET_NS |
541 | return cp->net; |
542 | #else |
543 | return &init_net; |
544 | #endif |
545 | } |
546 | static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net) |
547 | { |
548 | #ifdef CONFIG_NET_NS |
549 | cp->net = net; |
550 | #endif |
551 | } |
552 | |
553 | static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp, |
554 | struct net *net) |
555 | { |
556 | #ifdef CONFIG_NET_NS |
557 | return cp->net == net; |
558 | #else |
559 | return 1; |
560 | #endif |
561 | } |
562 | |
563 | /* |
564 | * Extended internal versions of struct ip_vs_service_user and |
565 | * ip_vs_dest_user for IPv6 support. |
566 | * |
567 | * We need these to conveniently pass around service and destination |
568 | * options, but unfortunately, we also need to keep the old definitions to |
569 | * maintain userspace backwards compatibility for the setsockopt interface. |
570 | */ |
571 | struct ip_vs_service_user_kern { |
572 | /* virtual service addresses */ |
573 | u16 af; |
574 | u16 protocol; |
575 | union nf_inet_addr addr; /* virtual ip address */ |
576 | u16 port; |
577 | u32 fwmark; /* firwall mark of service */ |
578 | |
579 | /* virtual service options */ |
580 | char *sched_name; |
581 | char *pe_name; |
582 | unsigned flags; /* virtual service flags */ |
583 | unsigned timeout; /* persistent timeout in sec */ |
584 | u32 netmask; /* persistent netmask */ |
585 | }; |
586 | |
587 | |
588 | struct ip_vs_dest_user_kern { |
589 | /* destination server address */ |
590 | union nf_inet_addr addr; |
591 | u16 port; |
592 | |
593 | /* real server options */ |
594 | unsigned conn_flags; /* connection flags */ |
595 | int weight; /* destination weight */ |
596 | |
597 | /* thresholds for active connections */ |
598 | u32 u_threshold; /* upper threshold */ |
599 | u32 l_threshold; /* lower threshold */ |
600 | }; |
601 | |
602 | |
603 | /* |
604 | * The information about the virtual service offered to the net |
605 | * and the forwarding entries |
606 | */ |
607 | struct ip_vs_service { |
608 | struct list_head s_list; /* for normal service table */ |
609 | struct list_head f_list; /* for fwmark-based service table */ |
610 | atomic_t refcnt; /* reference counter */ |
611 | atomic_t usecnt; /* use counter */ |
612 | |
613 | u16 af; /* address family */ |
614 | __u16 protocol; /* which protocol (TCP/UDP) */ |
615 | union nf_inet_addr addr; /* IP address for virtual service */ |
616 | __be16 port; /* port number for the service */ |
617 | __u32 fwmark; /* firewall mark of the service */ |
618 | unsigned flags; /* service status flags */ |
619 | unsigned timeout; /* persistent timeout in ticks */ |
620 | __be32 netmask; /* grouping granularity */ |
621 | struct net *net; |
622 | |
623 | struct list_head destinations; /* real server d-linked list */ |
624 | __u32 num_dests; /* number of servers */ |
625 | struct ip_vs_stats stats; /* statistics for the service */ |
626 | struct ip_vs_app *inc; /* bind conns to this app inc */ |
627 | |
628 | /* for scheduling */ |
629 | struct ip_vs_scheduler *scheduler; /* bound scheduler object */ |
630 | rwlock_t sched_lock; /* lock sched_data */ |
631 | void *sched_data; /* scheduler application data */ |
632 | |
633 | /* alternate persistence engine */ |
634 | struct ip_vs_pe *pe; |
635 | }; |
636 | |
637 | |
638 | /* |
639 | * The real server destination forwarding entry |
640 | * with ip address, port number, and so on. |
641 | */ |
642 | struct ip_vs_dest { |
643 | struct list_head n_list; /* for the dests in the service */ |
644 | struct list_head d_list; /* for table with all the dests */ |
645 | |
646 | u16 af; /* address family */ |
647 | __be16 port; /* port number of the server */ |
648 | union nf_inet_addr addr; /* IP address of the server */ |
649 | volatile unsigned flags; /* dest status flags */ |
650 | atomic_t conn_flags; /* flags to copy to conn */ |
651 | atomic_t weight; /* server weight */ |
652 | |
653 | atomic_t refcnt; /* reference counter */ |
654 | struct ip_vs_stats stats; /* statistics */ |
655 | |
656 | /* connection counters and thresholds */ |
657 | atomic_t activeconns; /* active connections */ |
658 | atomic_t inactconns; /* inactive connections */ |
659 | atomic_t persistconns; /* persistent connections */ |
660 | __u32 u_threshold; /* upper threshold */ |
661 | __u32 l_threshold; /* lower threshold */ |
662 | |
663 | /* for destination cache */ |
664 | spinlock_t dst_lock; /* lock of dst_cache */ |
665 | struct dst_entry *dst_cache; /* destination cache entry */ |
666 | u32 dst_rtos; /* RT_TOS(tos) for dst */ |
667 | u32 dst_cookie; |
668 | union nf_inet_addr dst_saddr; |
669 | |
670 | /* for virtual service */ |
671 | struct ip_vs_service *svc; /* service it belongs to */ |
672 | __u16 protocol; /* which protocol (TCP/UDP) */ |
673 | __be16 vport; /* virtual port number */ |
674 | union nf_inet_addr vaddr; /* virtual IP address */ |
675 | __u32 vfwmark; /* firewall mark of service */ |
676 | }; |
677 | |
678 | |
679 | /* |
680 | * The scheduler object |
681 | */ |
682 | struct ip_vs_scheduler { |
683 | struct list_head n_list; /* d-linked list head */ |
684 | char *name; /* scheduler name */ |
685 | atomic_t refcnt; /* reference counter */ |
686 | struct module *module; /* THIS_MODULE/NULL */ |
687 | |
688 | /* scheduler initializing service */ |
689 | int (*init_service)(struct ip_vs_service *svc); |
690 | /* scheduling service finish */ |
691 | int (*done_service)(struct ip_vs_service *svc); |
692 | /* scheduler updating service */ |
693 | int (*update_service)(struct ip_vs_service *svc); |
694 | |
695 | /* selecting a server from the given service */ |
696 | struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, |
697 | const struct sk_buff *skb); |
698 | }; |
699 | |
700 | /* The persistence engine object */ |
701 | struct ip_vs_pe { |
702 | struct list_head n_list; /* d-linked list head */ |
703 | char *name; /* scheduler name */ |
704 | atomic_t refcnt; /* reference counter */ |
705 | struct module *module; /* THIS_MODULE/NULL */ |
706 | |
707 | /* get the connection template, if any */ |
708 | int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); |
709 | bool (*ct_match)(const struct ip_vs_conn_param *p, |
710 | struct ip_vs_conn *ct); |
711 | u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval, |
712 | bool inverse); |
713 | int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); |
714 | }; |
715 | |
716 | /* |
717 | * The application module object (a.k.a. app incarnation) |
718 | */ |
719 | struct ip_vs_app { |
720 | struct list_head a_list; /* member in app list */ |
721 | int type; /* IP_VS_APP_TYPE_xxx */ |
722 | char *name; /* application module name */ |
723 | __u16 protocol; |
724 | struct module *module; /* THIS_MODULE/NULL */ |
725 | struct list_head incs_list; /* list of incarnations */ |
726 | |
727 | /* members for application incarnations */ |
728 | struct list_head p_list; /* member in proto app list */ |
729 | struct ip_vs_app *app; /* its real application */ |
730 | __be16 port; /* port number in net order */ |
731 | atomic_t usecnt; /* usage counter */ |
732 | |
733 | /* |
734 | * output hook: Process packet in inout direction, diff set for TCP. |
735 | * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, |
736 | * 2=Mangled but checksum was not updated |
737 | */ |
738 | int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, |
739 | struct sk_buff *, int *diff); |
740 | |
741 | /* |
742 | * input hook: Process packet in outin direction, diff set for TCP. |
743 | * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, |
744 | * 2=Mangled but checksum was not updated |
745 | */ |
746 | int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, |
747 | struct sk_buff *, int *diff); |
748 | |
749 | /* ip_vs_app initializer */ |
750 | int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); |
751 | |
752 | /* ip_vs_app finish */ |
753 | int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); |
754 | |
755 | |
756 | /* not used now */ |
757 | int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, |
758 | struct ip_vs_protocol *); |
759 | |
760 | void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); |
761 | |
762 | int * timeout_table; |
763 | int * timeouts; |
764 | int timeouts_size; |
765 | |
766 | int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, |
767 | int *verdict, struct ip_vs_conn **cpp); |
768 | |
769 | struct ip_vs_conn * |
770 | (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, |
771 | const struct iphdr *iph, unsigned int proto_off, |
772 | int inverse); |
773 | |
774 | struct ip_vs_conn * |
775 | (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, |
776 | const struct iphdr *iph, unsigned int proto_off, |
777 | int inverse); |
778 | |
779 | int (*state_transition)(struct ip_vs_conn *cp, int direction, |
780 | const struct sk_buff *skb, |
781 | struct ip_vs_app *app); |
782 | |
783 | void (*timeout_change)(struct ip_vs_app *app, int flags); |
784 | }; |
785 | |
786 | /* IPVS in network namespace */ |
787 | struct netns_ipvs { |
788 | int gen; /* Generation */ |
789 | int enable; /* enable like nf_hooks do */ |
790 | /* |
791 | * Hash table: for real service lookups |
792 | */ |
793 | #define IP_VS_RTAB_BITS 4 |
794 | #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) |
795 | #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) |
796 | |
797 | struct list_head rs_table[IP_VS_RTAB_SIZE]; |
798 | /* ip_vs_app */ |
799 | struct list_head app_list; |
800 | /* ip_vs_ftp */ |
801 | struct ip_vs_app *ftp_app; |
802 | /* ip_vs_proto */ |
803 | #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */ |
804 | struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE]; |
805 | /* ip_vs_proto_tcp */ |
806 | #ifdef CONFIG_IP_VS_PROTO_TCP |
807 | #define TCP_APP_TAB_BITS 4 |
808 | #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) |
809 | #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) |
810 | struct list_head tcp_apps[TCP_APP_TAB_SIZE]; |
811 | spinlock_t tcp_app_lock; |
812 | #endif |
813 | /* ip_vs_proto_udp */ |
814 | #ifdef CONFIG_IP_VS_PROTO_UDP |
815 | #define UDP_APP_TAB_BITS 4 |
816 | #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS) |
817 | #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1) |
818 | struct list_head udp_apps[UDP_APP_TAB_SIZE]; |
819 | spinlock_t udp_app_lock; |
820 | #endif |
821 | /* ip_vs_proto_sctp */ |
822 | #ifdef CONFIG_IP_VS_PROTO_SCTP |
823 | #define SCTP_APP_TAB_BITS 4 |
824 | #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) |
825 | #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) |
826 | /* Hash table for SCTP application incarnations */ |
827 | struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; |
828 | spinlock_t sctp_app_lock; |
829 | #endif |
830 | /* ip_vs_conn */ |
831 | atomic_t conn_count; /* connection counter */ |
832 | |
833 | /* ip_vs_ctl */ |
834 | struct ip_vs_stats tot_stats; /* Statistics & est. */ |
835 | |
836 | int num_services; /* no of virtual services */ |
837 | |
838 | rwlock_t rs_lock; /* real services table */ |
839 | /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */ |
840 | struct lock_class_key ctl_key; /* ctl_mutex debuging */ |
841 | /* Trash for destinations */ |
842 | struct list_head dest_trash; |
843 | /* Service counters */ |
844 | atomic_t ftpsvc_counter; |
845 | atomic_t nullsvc_counter; |
846 | |
847 | #ifdef CONFIG_SYSCTL |
848 | /* 1/rate drop and drop-entry variables */ |
849 | struct delayed_work defense_work; /* Work handler */ |
850 | int drop_rate; |
851 | int drop_counter; |
852 | atomic_t dropentry; |
853 | /* locks in ctl.c */ |
854 | spinlock_t dropentry_lock; /* drop entry handling */ |
855 | spinlock_t droppacket_lock; /* drop packet handling */ |
856 | spinlock_t securetcp_lock; /* state and timeout tables */ |
857 | |
858 | /* sys-ctl struct */ |
859 | struct ctl_table_header *sysctl_hdr; |
860 | struct ctl_table *sysctl_tbl; |
861 | #endif |
862 | |
863 | /* sysctl variables */ |
864 | int sysctl_amemthresh; |
865 | int sysctl_am_droprate; |
866 | int sysctl_drop_entry; |
867 | int sysctl_drop_packet; |
868 | int sysctl_secure_tcp; |
869 | #ifdef CONFIG_IP_VS_NFCT |
870 | int sysctl_conntrack; |
871 | #endif |
872 | int sysctl_snat_reroute; |
873 | int sysctl_sync_ver; |
874 | int sysctl_cache_bypass; |
875 | int sysctl_expire_nodest_conn; |
876 | int sysctl_expire_quiescent_template; |
877 | int sysctl_sync_threshold[2]; |
878 | int sysctl_nat_icmp_send; |
879 | |
880 | /* ip_vs_lblc */ |
881 | int sysctl_lblc_expiration; |
882 | struct ctl_table_header *lblc_ctl_header; |
883 | struct ctl_table *lblc_ctl_table; |
884 | /* ip_vs_lblcr */ |
885 | int sysctl_lblcr_expiration; |
886 | struct ctl_table_header *lblcr_ctl_header; |
887 | struct ctl_table *lblcr_ctl_table; |
888 | /* ip_vs_est */ |
889 | struct list_head est_list; /* estimator list */ |
890 | spinlock_t est_lock; |
891 | struct timer_list est_timer; /* Estimation timer */ |
892 | /* ip_vs_sync */ |
893 | struct list_head sync_queue; |
894 | spinlock_t sync_lock; |
895 | struct ip_vs_sync_buff *sync_buff; |
896 | spinlock_t sync_buff_lock; |
897 | struct sockaddr_in sync_mcast_addr; |
898 | struct task_struct *master_thread; |
899 | struct task_struct *backup_thread; |
900 | int send_mesg_maxlen; |
901 | int recv_mesg_maxlen; |
902 | volatile int sync_state; |
903 | volatile int master_syncid; |
904 | volatile int backup_syncid; |
905 | /* multicast interface name */ |
906 | char master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; |
907 | char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; |
908 | /* net name space ptr */ |
909 | struct net *net; /* Needed by timer routines */ |
910 | }; |
911 | |
912 | #define DEFAULT_SYNC_THRESHOLD 3 |
913 | #define DEFAULT_SYNC_PERIOD 50 |
914 | #define DEFAULT_SYNC_VER 1 |
915 | |
916 | #ifdef CONFIG_SYSCTL |
917 | |
918 | static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) |
919 | { |
920 | return ipvs->sysctl_sync_threshold[0]; |
921 | } |
922 | |
923 | static inline int sysctl_sync_period(struct netns_ipvs *ipvs) |
924 | { |
925 | return ipvs->sysctl_sync_threshold[1]; |
926 | } |
927 | |
928 | static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) |
929 | { |
930 | return ipvs->sysctl_sync_ver; |
931 | } |
932 | |
933 | #else |
934 | |
935 | static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) |
936 | { |
937 | return DEFAULT_SYNC_THRESHOLD; |
938 | } |
939 | |
940 | static inline int sysctl_sync_period(struct netns_ipvs *ipvs) |
941 | { |
942 | return DEFAULT_SYNC_PERIOD; |
943 | } |
944 | |
945 | static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) |
946 | { |
947 | return DEFAULT_SYNC_VER; |
948 | } |
949 | |
950 | #endif |
951 | |
952 | /* |
953 | * IPVS core functions |
954 | * (from ip_vs_core.c) |
955 | */ |
956 | extern const char *ip_vs_proto_name(unsigned proto); |
957 | extern void ip_vs_init_hash_table(struct list_head *table, int rows); |
958 | #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) |
959 | |
960 | #define IP_VS_APP_TYPE_FTP 1 |
961 | |
962 | /* |
963 | * ip_vs_conn handling functions |
964 | * (from ip_vs_conn.c) |
965 | */ |
966 | |
967 | enum { |
968 | IP_VS_DIR_INPUT = 0, |
969 | IP_VS_DIR_OUTPUT, |
970 | IP_VS_DIR_INPUT_ONLY, |
971 | IP_VS_DIR_LAST, |
972 | }; |
973 | |
974 | static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol, |
975 | const union nf_inet_addr *caddr, |
976 | __be16 cport, |
977 | const union nf_inet_addr *vaddr, |
978 | __be16 vport, |
979 | struct ip_vs_conn_param *p) |
980 | { |
981 | p->net = net; |
982 | p->af = af; |
983 | p->protocol = protocol; |
984 | p->caddr = caddr; |
985 | p->cport = cport; |
986 | p->vaddr = vaddr; |
987 | p->vport = vport; |
988 | p->pe = NULL; |
989 | p->pe_data = NULL; |
990 | } |
991 | |
992 | struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); |
993 | struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); |
994 | |
995 | struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb, |
996 | const struct ip_vs_iphdr *iph, |
997 | unsigned int proto_off, |
998 | int inverse); |
999 | |
1000 | struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); |
1001 | |
1002 | struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, |
1003 | const struct ip_vs_iphdr *iph, |
1004 | unsigned int proto_off, |
1005 | int inverse); |
1006 | |
1007 | /* put back the conn without restarting its timer */ |
1008 | static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) |
1009 | { |
1010 | atomic_dec(&cp->refcnt); |
1011 | } |
1012 | extern void ip_vs_conn_put(struct ip_vs_conn *cp); |
1013 | extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); |
1014 | |
1015 | struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, |
1016 | const union nf_inet_addr *daddr, |
1017 | __be16 dport, unsigned flags, |
1018 | struct ip_vs_dest *dest, __u32 fwmark); |
1019 | extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); |
1020 | |
1021 | extern const char * ip_vs_state_name(__u16 proto, int state); |
1022 | |
1023 | extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp); |
1024 | extern int ip_vs_check_template(struct ip_vs_conn *ct); |
1025 | extern void ip_vs_random_dropentry(struct net *net); |
1026 | extern int ip_vs_conn_init(void); |
1027 | extern void ip_vs_conn_cleanup(void); |
1028 | |
1029 | static inline void ip_vs_control_del(struct ip_vs_conn *cp) |
1030 | { |
1031 | struct ip_vs_conn *ctl_cp = cp->control; |
1032 | if (!ctl_cp) { |
1033 | IP_VS_ERR_BUF("request control DEL for uncontrolled: " |
1034 | "%s:%d to %s:%d\n", |
1035 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
1036 | ntohs(cp->cport), |
1037 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
1038 | ntohs(cp->vport)); |
1039 | |
1040 | return; |
1041 | } |
1042 | |
1043 | IP_VS_DBG_BUF(7, "DELeting control for: " |
1044 | "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", |
1045 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
1046 | ntohs(cp->cport), |
1047 | IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), |
1048 | ntohs(ctl_cp->cport)); |
1049 | |
1050 | cp->control = NULL; |
1051 | if (atomic_read(&ctl_cp->n_control) == 0) { |
1052 | IP_VS_ERR_BUF("BUG control DEL with n=0 : " |
1053 | "%s:%d to %s:%d\n", |
1054 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
1055 | ntohs(cp->cport), |
1056 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
1057 | ntohs(cp->vport)); |
1058 | |
1059 | return; |
1060 | } |
1061 | atomic_dec(&ctl_cp->n_control); |
1062 | } |
1063 | |
1064 | static inline void |
1065 | ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) |
1066 | { |
1067 | if (cp->control) { |
1068 | IP_VS_ERR_BUF("request control ADD for already controlled: " |
1069 | "%s:%d to %s:%d\n", |
1070 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
1071 | ntohs(cp->cport), |
1072 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
1073 | ntohs(cp->vport)); |
1074 | |
1075 | ip_vs_control_del(cp); |
1076 | } |
1077 | |
1078 | IP_VS_DBG_BUF(7, "ADDing control for: " |
1079 | "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", |
1080 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
1081 | ntohs(cp->cport), |
1082 | IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), |
1083 | ntohs(ctl_cp->cport)); |
1084 | |
1085 | cp->control = ctl_cp; |
1086 | atomic_inc(&ctl_cp->n_control); |
1087 | } |
1088 | |
1089 | /* |
1090 | * IPVS netns init & cleanup functions |
1091 | */ |
1092 | extern int __ip_vs_estimator_init(struct net *net); |
1093 | extern int __ip_vs_control_init(struct net *net); |
1094 | extern int __ip_vs_protocol_init(struct net *net); |
1095 | extern int __ip_vs_app_init(struct net *net); |
1096 | extern int __ip_vs_conn_init(struct net *net); |
1097 | extern int __ip_vs_sync_init(struct net *net); |
1098 | extern void __ip_vs_conn_cleanup(struct net *net); |
1099 | extern void __ip_vs_app_cleanup(struct net *net); |
1100 | extern void __ip_vs_protocol_cleanup(struct net *net); |
1101 | extern void __ip_vs_control_cleanup(struct net *net); |
1102 | extern void __ip_vs_estimator_cleanup(struct net *net); |
1103 | extern void __ip_vs_sync_cleanup(struct net *net); |
1104 | extern void __ip_vs_service_cleanup(struct net *net); |
1105 | |
1106 | /* |
1107 | * IPVS application functions |
1108 | * (from ip_vs_app.c) |
1109 | */ |
1110 | #define IP_VS_APP_MAX_PORTS 8 |
1111 | extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app); |
1112 | extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app); |
1113 | extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1114 | extern void ip_vs_unbind_app(struct ip_vs_conn *cp); |
1115 | extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, |
1116 | __u16 proto, __u16 port); |
1117 | extern int ip_vs_app_inc_get(struct ip_vs_app *inc); |
1118 | extern void ip_vs_app_inc_put(struct ip_vs_app *inc); |
1119 | |
1120 | extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); |
1121 | extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); |
1122 | extern int ip_vs_app_init(void); |
1123 | extern void ip_vs_app_cleanup(void); |
1124 | |
1125 | void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe); |
1126 | void ip_vs_unbind_pe(struct ip_vs_service *svc); |
1127 | int register_ip_vs_pe(struct ip_vs_pe *pe); |
1128 | int unregister_ip_vs_pe(struct ip_vs_pe *pe); |
1129 | struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); |
1130 | struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); |
1131 | |
1132 | static inline void ip_vs_pe_get(const struct ip_vs_pe *pe) |
1133 | { |
1134 | if (pe && pe->module) |
1135 | __module_get(pe->module); |
1136 | } |
1137 | |
1138 | static inline void ip_vs_pe_put(const struct ip_vs_pe *pe) |
1139 | { |
1140 | if (pe && pe->module) |
1141 | module_put(pe->module); |
1142 | } |
1143 | |
1144 | /* |
1145 | * IPVS protocol functions (from ip_vs_proto.c) |
1146 | */ |
1147 | extern int ip_vs_protocol_init(void); |
1148 | extern void ip_vs_protocol_cleanup(void); |
1149 | extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); |
1150 | extern int *ip_vs_create_timeout_table(int *table, int size); |
1151 | extern int |
1152 | ip_vs_set_state_timeout(int *table, int num, const char *const *names, |
1153 | const char *name, int to); |
1154 | extern void |
1155 | ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, |
1156 | const struct sk_buff *skb, |
1157 | int offset, const char *msg); |
1158 | |
1159 | extern struct ip_vs_protocol ip_vs_protocol_tcp; |
1160 | extern struct ip_vs_protocol ip_vs_protocol_udp; |
1161 | extern struct ip_vs_protocol ip_vs_protocol_icmp; |
1162 | extern struct ip_vs_protocol ip_vs_protocol_esp; |
1163 | extern struct ip_vs_protocol ip_vs_protocol_ah; |
1164 | extern struct ip_vs_protocol ip_vs_protocol_sctp; |
1165 | |
1166 | /* |
1167 | * Registering/unregistering scheduler functions |
1168 | * (from ip_vs_sched.c) |
1169 | */ |
1170 | extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); |
1171 | extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); |
1172 | extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, |
1173 | struct ip_vs_scheduler *scheduler); |
1174 | extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); |
1175 | extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); |
1176 | extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); |
1177 | extern struct ip_vs_conn * |
1178 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
1179 | struct ip_vs_proto_data *pd, int *ignored); |
1180 | extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, |
1181 | struct ip_vs_proto_data *pd); |
1182 | |
1183 | extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); |
1184 | |
1185 | |
1186 | /* |
1187 | * IPVS control data and functions (from ip_vs_ctl.c) |
1188 | */ |
1189 | extern struct ip_vs_stats ip_vs_stats; |
1190 | extern const struct ctl_path net_vs_ctl_path[]; |
1191 | extern int sysctl_ip_vs_sync_ver; |
1192 | |
1193 | extern void ip_vs_sync_switch_mode(struct net *net, int mode); |
1194 | extern struct ip_vs_service * |
1195 | ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol, |
1196 | const union nf_inet_addr *vaddr, __be16 vport); |
1197 | |
1198 | static inline void ip_vs_service_put(struct ip_vs_service *svc) |
1199 | { |
1200 | atomic_dec(&svc->usecnt); |
1201 | } |
1202 | |
1203 | extern struct ip_vs_dest * |
1204 | ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol, |
1205 | const union nf_inet_addr *daddr, __be16 dport); |
1206 | |
1207 | extern int ip_vs_use_count_inc(void); |
1208 | extern void ip_vs_use_count_dec(void); |
1209 | extern int ip_vs_control_init(void); |
1210 | extern void ip_vs_control_cleanup(void); |
1211 | extern struct ip_vs_dest * |
1212 | ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr, |
1213 | __be16 dport, const union nf_inet_addr *vaddr, __be16 vport, |
1214 | __u16 protocol, __u32 fwmark); |
1215 | extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); |
1216 | |
1217 | |
1218 | /* |
1219 | * IPVS sync daemon data and function prototypes |
1220 | * (from ip_vs_sync.c) |
1221 | */ |
1222 | extern int start_sync_thread(struct net *net, int state, char *mcast_ifn, |
1223 | __u8 syncid); |
1224 | extern int stop_sync_thread(struct net *net, int state); |
1225 | extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp); |
1226 | extern int ip_vs_sync_init(void); |
1227 | extern void ip_vs_sync_cleanup(void); |
1228 | |
1229 | |
1230 | /* |
1231 | * IPVS rate estimator prototypes (from ip_vs_est.c) |
1232 | */ |
1233 | extern int ip_vs_estimator_init(void); |
1234 | extern void ip_vs_estimator_cleanup(void); |
1235 | extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats); |
1236 | extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats); |
1237 | extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); |
1238 | extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst, |
1239 | struct ip_vs_stats *stats); |
1240 | |
1241 | /* |
1242 | * Various IPVS packet transmitters (from ip_vs_xmit.c) |
1243 | */ |
1244 | extern int ip_vs_null_xmit |
1245 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1246 | extern int ip_vs_bypass_xmit |
1247 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1248 | extern int ip_vs_nat_xmit |
1249 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1250 | extern int ip_vs_tunnel_xmit |
1251 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1252 | extern int ip_vs_dr_xmit |
1253 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1254 | extern int ip_vs_icmp_xmit |
1255 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, |
1256 | int offset, unsigned int hooknum); |
1257 | extern void ip_vs_dst_reset(struct ip_vs_dest *dest); |
1258 | |
1259 | #ifdef CONFIG_IP_VS_IPV6 |
1260 | extern int ip_vs_bypass_xmit_v6 |
1261 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1262 | extern int ip_vs_nat_xmit_v6 |
1263 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1264 | extern int ip_vs_tunnel_xmit_v6 |
1265 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1266 | extern int ip_vs_dr_xmit_v6 |
1267 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); |
1268 | extern int ip_vs_icmp_xmit_v6 |
1269 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, |
1270 | int offset, unsigned int hooknum); |
1271 | #endif |
1272 | |
1273 | #ifdef CONFIG_SYSCTL |
1274 | /* |
1275 | * This is a simple mechanism to ignore packets when |
1276 | * we are loaded. Just set ip_vs_drop_rate to 'n' and |
1277 | * we start to drop 1/rate of the packets |
1278 | */ |
1279 | |
1280 | static inline int ip_vs_todrop(struct netns_ipvs *ipvs) |
1281 | { |
1282 | if (!ipvs->drop_rate) |
1283 | return 0; |
1284 | if (--ipvs->drop_counter > 0) |
1285 | return 0; |
1286 | ipvs->drop_counter = ipvs->drop_rate; |
1287 | return 1; |
1288 | } |
1289 | #else |
1290 | static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } |
1291 | #endif |
1292 | |
1293 | /* |
1294 | * ip_vs_fwd_tag returns the forwarding tag of the connection |
1295 | */ |
1296 | #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) |
1297 | |
1298 | static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) |
1299 | { |
1300 | char fwd; |
1301 | |
1302 | switch (IP_VS_FWD_METHOD(cp)) { |
1303 | case IP_VS_CONN_F_MASQ: |
1304 | fwd = 'M'; break; |
1305 | case IP_VS_CONN_F_LOCALNODE: |
1306 | fwd = 'L'; break; |
1307 | case IP_VS_CONN_F_TUNNEL: |
1308 | fwd = 'T'; break; |
1309 | case IP_VS_CONN_F_DROUTE: |
1310 | fwd = 'R'; break; |
1311 | case IP_VS_CONN_F_BYPASS: |
1312 | fwd = 'B'; break; |
1313 | default: |
1314 | fwd = '?'; break; |
1315 | } |
1316 | return fwd; |
1317 | } |
1318 | |
1319 | extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
1320 | struct ip_vs_conn *cp, int dir); |
1321 | |
1322 | #ifdef CONFIG_IP_VS_IPV6 |
1323 | extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, |
1324 | struct ip_vs_conn *cp, int dir); |
1325 | #endif |
1326 | |
1327 | extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); |
1328 | |
1329 | static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) |
1330 | { |
1331 | __be32 diff[2] = { ~old, new }; |
1332 | |
1333 | return csum_partial(diff, sizeof(diff), oldsum); |
1334 | } |
1335 | |
1336 | #ifdef CONFIG_IP_VS_IPV6 |
1337 | static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, |
1338 | __wsum oldsum) |
1339 | { |
1340 | __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], |
1341 | new[3], new[2], new[1], new[0] }; |
1342 | |
1343 | return csum_partial(diff, sizeof(diff), oldsum); |
1344 | } |
1345 | #endif |
1346 | |
1347 | static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) |
1348 | { |
1349 | __be16 diff[2] = { ~old, new }; |
1350 | |
1351 | return csum_partial(diff, sizeof(diff), oldsum); |
1352 | } |
1353 | |
1354 | /* |
1355 | * Forget current conntrack (unconfirmed) and attach notrack entry |
1356 | */ |
1357 | static inline void ip_vs_notrack(struct sk_buff *skb) |
1358 | { |
1359 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
1360 | enum ip_conntrack_info ctinfo; |
1361 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
1362 | |
1363 | if (!ct || !nf_ct_is_untracked(ct)) { |
1364 | nf_reset(skb); |
1365 | skb->nfct = &nf_ct_untracked_get()->ct_general; |
1366 | skb->nfctinfo = IP_CT_NEW; |
1367 | nf_conntrack_get(skb->nfct); |
1368 | } |
1369 | #endif |
1370 | } |
1371 | |
1372 | #ifdef CONFIG_IP_VS_NFCT |
1373 | /* |
1374 | * Netfilter connection tracking |
1375 | * (from ip_vs_nfct.c) |
1376 | */ |
1377 | static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) |
1378 | { |
1379 | #ifdef CONFIG_SYSCTL |
1380 | return ipvs->sysctl_conntrack; |
1381 | #else |
1382 | return 0; |
1383 | #endif |
1384 | } |
1385 | |
1386 | extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, |
1387 | int outin); |
1388 | extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp); |
1389 | extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, |
1390 | struct ip_vs_conn *cp, u_int8_t proto, |
1391 | const __be16 port, int from_rs); |
1392 | extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); |
1393 | |
1394 | #else |
1395 | |
1396 | static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) |
1397 | { |
1398 | return 0; |
1399 | } |
1400 | |
1401 | static inline void ip_vs_update_conntrack(struct sk_buff *skb, |
1402 | struct ip_vs_conn *cp, int outin) |
1403 | { |
1404 | } |
1405 | |
1406 | static inline int ip_vs_confirm_conntrack(struct sk_buff *skb, |
1407 | struct ip_vs_conn *cp) |
1408 | { |
1409 | return NF_ACCEPT; |
1410 | } |
1411 | |
1412 | static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) |
1413 | { |
1414 | } |
1415 | /* CONFIG_IP_VS_NFCT */ |
1416 | #endif |
1417 | |
1418 | static inline unsigned int |
1419 | ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) |
1420 | { |
1421 | /* |
1422 | * We think the overhead of processing active connections is 256 |
1423 | * times higher than that of inactive connections in average. (This |
1424 | * 256 times might not be accurate, we will change it later) We |
1425 | * use the following formula to estimate the overhead now: |
1426 | * dest->activeconns*256 + dest->inactconns |
1427 | */ |
1428 | return (atomic_read(&dest->activeconns) << 8) + |
1429 | atomic_read(&dest->inactconns); |
1430 | } |
1431 | |
1432 | #endif /* _NET_IP_VS_H */ |
1433 |
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