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[linux-2.6/next.git] / include / net / ip_vs.h
blob481f856c650f8132f77f7f0c9afaa78fe83eb39b
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 */
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