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[mirror_ubuntu-zesty-kernel.git] / include / net / ip_vs.h
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 <linux/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 /* Trash for destinations */
840 struct list_head dest_trash;
841 /* Service counters */
842 atomic_t ftpsvc_counter;
843 atomic_t nullsvc_counter;
844
845 #ifdef CONFIG_SYSCTL
846 /* 1/rate drop and drop-entry variables */
847 struct delayed_work defense_work; /* Work handler */
848 int drop_rate;
849 int drop_counter;
850 atomic_t dropentry;
851 /* locks in ctl.c */
852 spinlock_t dropentry_lock; /* drop entry handling */
853 spinlock_t droppacket_lock; /* drop packet handling */
854 spinlock_t securetcp_lock; /* state and timeout tables */
855
856 /* sys-ctl struct */
857 struct ctl_table_header *sysctl_hdr;
858 struct ctl_table *sysctl_tbl;
859 #endif
860
861 /* sysctl variables */
862 int sysctl_amemthresh;
863 int sysctl_am_droprate;
864 int sysctl_drop_entry;
865 int sysctl_drop_packet;
866 int sysctl_secure_tcp;
867 #ifdef CONFIG_IP_VS_NFCT
868 int sysctl_conntrack;
869 #endif
870 int sysctl_snat_reroute;
871 int sysctl_sync_ver;
872 int sysctl_cache_bypass;
873 int sysctl_expire_nodest_conn;
874 int sysctl_expire_quiescent_template;
875 int sysctl_sync_threshold[2];
876 int sysctl_nat_icmp_send;
877
878 /* ip_vs_lblc */
879 int sysctl_lblc_expiration;
880 struct ctl_table_header *lblc_ctl_header;
881 struct ctl_table *lblc_ctl_table;
882 /* ip_vs_lblcr */
883 int sysctl_lblcr_expiration;
884 struct ctl_table_header *lblcr_ctl_header;
885 struct ctl_table *lblcr_ctl_table;
886 /* ip_vs_est */
887 struct list_head est_list; /* estimator list */
888 spinlock_t est_lock;
889 struct timer_list est_timer; /* Estimation timer */
890 /* ip_vs_sync */
891 struct list_head sync_queue;
892 spinlock_t sync_lock;
893 struct ip_vs_sync_buff *sync_buff;
894 spinlock_t sync_buff_lock;
895 struct sockaddr_in sync_mcast_addr;
896 struct task_struct *master_thread;
897 struct task_struct *backup_thread;
898 int send_mesg_maxlen;
899 int recv_mesg_maxlen;
900 volatile int sync_state;
901 volatile int master_syncid;
902 volatile int backup_syncid;
903 struct mutex sync_mutex;
904 /* multicast interface name */
905 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
906 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
907 /* net name space ptr */
908 struct net *net; /* Needed by timer routines */
909 };
910
911 #define DEFAULT_SYNC_THRESHOLD 3
912 #define DEFAULT_SYNC_PERIOD 50
913 #define DEFAULT_SYNC_VER 1
914
915 #ifdef CONFIG_SYSCTL
916
917 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
918 {
919 return ipvs->sysctl_sync_threshold[0];
920 }
921
922 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
923 {
924 return ipvs->sysctl_sync_threshold[1];
925 }
926
927 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
928 {
929 return ipvs->sysctl_sync_ver;
930 }
931
932 #else
933
934 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
935 {
936 return DEFAULT_SYNC_THRESHOLD;
937 }
938
939 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
940 {
941 return DEFAULT_SYNC_PERIOD;
942 }
943
944 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
945 {
946 return DEFAULT_SYNC_VER;
947 }
948
949 #endif
950
951 /*
952 * IPVS core functions
953 * (from ip_vs_core.c)
954 */
955 extern const char *ip_vs_proto_name(unsigned proto);
956 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
957 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
958
959 #define IP_VS_APP_TYPE_FTP 1
960
961 /*
962 * ip_vs_conn handling functions
963 * (from ip_vs_conn.c)
964 */
965
966 enum {
967 IP_VS_DIR_INPUT = 0,
968 IP_VS_DIR_OUTPUT,
969 IP_VS_DIR_INPUT_ONLY,
970 IP_VS_DIR_LAST,
971 };
972
973 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
974 const union nf_inet_addr *caddr,
975 __be16 cport,
976 const union nf_inet_addr *vaddr,
977 __be16 vport,
978 struct ip_vs_conn_param *p)
979 {
980 p->net = net;
981 p->af = af;
982 p->protocol = protocol;
983 p->caddr = caddr;
984 p->cport = cport;
985 p->vaddr = vaddr;
986 p->vport = vport;
987 p->pe = NULL;
988 p->pe_data = NULL;
989 }
990
991 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
992 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
993
994 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
995 const struct ip_vs_iphdr *iph,
996 unsigned int proto_off,
997 int inverse);
998
999 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1000
1001 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1002 const struct ip_vs_iphdr *iph,
1003 unsigned int proto_off,
1004 int inverse);
1005
1006 /* put back the conn without restarting its timer */
1007 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1008 {
1009 atomic_dec(&cp->refcnt);
1010 }
1011 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1012 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1013
1014 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1015 const union nf_inet_addr *daddr,
1016 __be16 dport, unsigned flags,
1017 struct ip_vs_dest *dest, __u32 fwmark);
1018 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1019
1020 extern const char * ip_vs_state_name(__u16 proto, int state);
1021
1022 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1023 extern int ip_vs_check_template(struct ip_vs_conn *ct);
1024 extern void ip_vs_random_dropentry(struct net *net);
1025 extern int ip_vs_conn_init(void);
1026 extern void ip_vs_conn_cleanup(void);
1027
1028 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1029 {
1030 struct ip_vs_conn *ctl_cp = cp->control;
1031 if (!ctl_cp) {
1032 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1033 "%s:%d to %s:%d\n",
1034 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1035 ntohs(cp->cport),
1036 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1037 ntohs(cp->vport));
1038
1039 return;
1040 }
1041
1042 IP_VS_DBG_BUF(7, "DELeting control for: "
1043 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1044 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1045 ntohs(cp->cport),
1046 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1047 ntohs(ctl_cp->cport));
1048
1049 cp->control = NULL;
1050 if (atomic_read(&ctl_cp->n_control) == 0) {
1051 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1052 "%s:%d to %s:%d\n",
1053 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1054 ntohs(cp->cport),
1055 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1056 ntohs(cp->vport));
1057
1058 return;
1059 }
1060 atomic_dec(&ctl_cp->n_control);
1061 }
1062
1063 static inline void
1064 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1065 {
1066 if (cp->control) {
1067 IP_VS_ERR_BUF("request control ADD for already controlled: "
1068 "%s:%d to %s:%d\n",
1069 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1070 ntohs(cp->cport),
1071 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1072 ntohs(cp->vport));
1073
1074 ip_vs_control_del(cp);
1075 }
1076
1077 IP_VS_DBG_BUF(7, "ADDing control for: "
1078 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1079 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1080 ntohs(cp->cport),
1081 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1082 ntohs(ctl_cp->cport));
1083
1084 cp->control = ctl_cp;
1085 atomic_inc(&ctl_cp->n_control);
1086 }
1087
1088 /*
1089 * IPVS netns init & cleanup functions
1090 */
1091 extern int ip_vs_estimator_net_init(struct net *net);
1092 extern int ip_vs_control_net_init(struct net *net);
1093 extern int ip_vs_protocol_net_init(struct net *net);
1094 extern int ip_vs_app_net_init(struct net *net);
1095 extern int ip_vs_conn_net_init(struct net *net);
1096 extern int ip_vs_sync_net_init(struct net *net);
1097 extern void ip_vs_conn_net_cleanup(struct net *net);
1098 extern void ip_vs_app_net_cleanup(struct net *net);
1099 extern void ip_vs_protocol_net_cleanup(struct net *net);
1100 extern void ip_vs_control_net_cleanup(struct net *net);
1101 extern void ip_vs_estimator_net_cleanup(struct net *net);
1102 extern void ip_vs_sync_net_cleanup(struct net *net);
1103 extern void ip_vs_service_net_cleanup(struct net *net);
1104
1105 /*
1106 * IPVS application functions
1107 * (from ip_vs_app.c)
1108 */
1109 #define IP_VS_APP_MAX_PORTS 8
1110 extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1111 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1112 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1113 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1114 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1115 __u16 proto, __u16 port);
1116 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1117 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1118
1119 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1120 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1121
1122 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1123 void ip_vs_unbind_pe(struct ip_vs_service *svc);
1124 int register_ip_vs_pe(struct ip_vs_pe *pe);
1125 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1126 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1127 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1128
1129 static inline void ip_vs_pe_get(const struct ip_vs_pe *pe)
1130 {
1131 if (pe && pe->module)
1132 __module_get(pe->module);
1133 }
1134
1135 static inline void ip_vs_pe_put(const struct ip_vs_pe *pe)
1136 {
1137 if (pe && pe->module)
1138 module_put(pe->module);
1139 }
1140
1141 /*
1142 * IPVS protocol functions (from ip_vs_proto.c)
1143 */
1144 extern int ip_vs_protocol_init(void);
1145 extern void ip_vs_protocol_cleanup(void);
1146 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1147 extern int *ip_vs_create_timeout_table(int *table, int size);
1148 extern int
1149 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1150 const char *name, int to);
1151 extern void
1152 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1153 const struct sk_buff *skb,
1154 int offset, const char *msg);
1155
1156 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1157 extern struct ip_vs_protocol ip_vs_protocol_udp;
1158 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1159 extern struct ip_vs_protocol ip_vs_protocol_esp;
1160 extern struct ip_vs_protocol ip_vs_protocol_ah;
1161 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1162
1163 /*
1164 * Registering/unregistering scheduler functions
1165 * (from ip_vs_sched.c)
1166 */
1167 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1168 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1169 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1170 struct ip_vs_scheduler *scheduler);
1171 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1172 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1173 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1174 extern struct ip_vs_conn *
1175 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1176 struct ip_vs_proto_data *pd, int *ignored);
1177 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1178 struct ip_vs_proto_data *pd);
1179
1180 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1181
1182
1183 /*
1184 * IPVS control data and functions (from ip_vs_ctl.c)
1185 */
1186 extern struct ip_vs_stats ip_vs_stats;
1187 extern const struct ctl_path net_vs_ctl_path[];
1188 extern int sysctl_ip_vs_sync_ver;
1189
1190 extern void ip_vs_sync_switch_mode(struct net *net, int mode);
1191 extern struct ip_vs_service *
1192 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1193 const union nf_inet_addr *vaddr, __be16 vport);
1194
1195 static inline void ip_vs_service_put(struct ip_vs_service *svc)
1196 {
1197 atomic_dec(&svc->usecnt);
1198 }
1199
1200 extern struct ip_vs_dest *
1201 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1202 const union nf_inet_addr *daddr, __be16 dport);
1203
1204 extern int ip_vs_use_count_inc(void);
1205 extern void ip_vs_use_count_dec(void);
1206 extern int ip_vs_control_init(void);
1207 extern void ip_vs_control_cleanup(void);
1208 extern struct ip_vs_dest *
1209 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1210 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1211 __u16 protocol, __u32 fwmark);
1212 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1213
1214
1215 /*
1216 * IPVS sync daemon data and function prototypes
1217 * (from ip_vs_sync.c)
1218 */
1219 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1220 __u8 syncid);
1221 extern int stop_sync_thread(struct net *net, int state);
1222 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp);
1223
1224
1225 /*
1226 * IPVS rate estimator prototypes (from ip_vs_est.c)
1227 */
1228 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1229 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1230 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1231 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1232 struct ip_vs_stats *stats);
1233
1234 /*
1235 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1236 */
1237 extern int ip_vs_null_xmit
1238 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1239 extern int ip_vs_bypass_xmit
1240 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1241 extern int ip_vs_nat_xmit
1242 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1243 extern int ip_vs_tunnel_xmit
1244 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1245 extern int ip_vs_dr_xmit
1246 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1247 extern int ip_vs_icmp_xmit
1248 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1249 int offset, unsigned int hooknum);
1250 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1251
1252 #ifdef CONFIG_IP_VS_IPV6
1253 extern int ip_vs_bypass_xmit_v6
1254 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1255 extern int ip_vs_nat_xmit_v6
1256 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1257 extern int ip_vs_tunnel_xmit_v6
1258 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1259 extern int ip_vs_dr_xmit_v6
1260 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1261 extern int ip_vs_icmp_xmit_v6
1262 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1263 int offset, unsigned int hooknum);
1264 #endif
1265
1266 #ifdef CONFIG_SYSCTL
1267 /*
1268 * This is a simple mechanism to ignore packets when
1269 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1270 * we start to drop 1/rate of the packets
1271 */
1272
1273 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1274 {
1275 if (!ipvs->drop_rate)
1276 return 0;
1277 if (--ipvs->drop_counter > 0)
1278 return 0;
1279 ipvs->drop_counter = ipvs->drop_rate;
1280 return 1;
1281 }
1282 #else
1283 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1284 #endif
1285
1286 /*
1287 * ip_vs_fwd_tag returns the forwarding tag of the connection
1288 */
1289 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1290
1291 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1292 {
1293 char fwd;
1294
1295 switch (IP_VS_FWD_METHOD(cp)) {
1296 case IP_VS_CONN_F_MASQ:
1297 fwd = 'M'; break;
1298 case IP_VS_CONN_F_LOCALNODE:
1299 fwd = 'L'; break;
1300 case IP_VS_CONN_F_TUNNEL:
1301 fwd = 'T'; break;
1302 case IP_VS_CONN_F_DROUTE:
1303 fwd = 'R'; break;
1304 case IP_VS_CONN_F_BYPASS:
1305 fwd = 'B'; break;
1306 default:
1307 fwd = '?'; break;
1308 }
1309 return fwd;
1310 }
1311
1312 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1313 struct ip_vs_conn *cp, int dir);
1314
1315 #ifdef CONFIG_IP_VS_IPV6
1316 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1317 struct ip_vs_conn *cp, int dir);
1318 #endif
1319
1320 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1321
1322 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1323 {
1324 __be32 diff[2] = { ~old, new };
1325
1326 return csum_partial(diff, sizeof(diff), oldsum);
1327 }
1328
1329 #ifdef CONFIG_IP_VS_IPV6
1330 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1331 __wsum oldsum)
1332 {
1333 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1334 new[3], new[2], new[1], new[0] };
1335
1336 return csum_partial(diff, sizeof(diff), oldsum);
1337 }
1338 #endif
1339
1340 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1341 {
1342 __be16 diff[2] = { ~old, new };
1343
1344 return csum_partial(diff, sizeof(diff), oldsum);
1345 }
1346
1347 /*
1348 * Forget current conntrack (unconfirmed) and attach notrack entry
1349 */
1350 static inline void ip_vs_notrack(struct sk_buff *skb)
1351 {
1352 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1353 enum ip_conntrack_info ctinfo;
1354 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1355
1356 if (!ct || !nf_ct_is_untracked(ct)) {
1357 nf_reset(skb);
1358 skb->nfct = &nf_ct_untracked_get()->ct_general;
1359 skb->nfctinfo = IP_CT_NEW;
1360 nf_conntrack_get(skb->nfct);
1361 }
1362 #endif
1363 }
1364
1365 #ifdef CONFIG_IP_VS_NFCT
1366 /*
1367 * Netfilter connection tracking
1368 * (from ip_vs_nfct.c)
1369 */
1370 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1371 {
1372 #ifdef CONFIG_SYSCTL
1373 return ipvs->sysctl_conntrack;
1374 #else
1375 return 0;
1376 #endif
1377 }
1378
1379 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1380 int outin);
1381 extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1382 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1383 struct ip_vs_conn *cp, u_int8_t proto,
1384 const __be16 port, int from_rs);
1385 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1386
1387 #else
1388
1389 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1390 {
1391 return 0;
1392 }
1393
1394 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1395 struct ip_vs_conn *cp, int outin)
1396 {
1397 }
1398
1399 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1400 struct ip_vs_conn *cp)
1401 {
1402 return NF_ACCEPT;
1403 }
1404
1405 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1406 {
1407 }
1408 /* CONFIG_IP_VS_NFCT */
1409 #endif
1410
1411 static inline unsigned int
1412 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1413 {
1414 /*
1415 * We think the overhead of processing active connections is 256
1416 * times higher than that of inactive connections in average. (This
1417 * 256 times might not be accurate, we will change it later) We
1418 * use the following formula to estimate the overhead now:
1419 * dest->activeconns*256 + dest->inactconns
1420 */
1421 return (atomic_read(&dest->activeconns) << 8) +
1422 atomic_read(&dest->inactconns);
1423 }
1424
1425 #endif /* _NET_IP_VS_H */
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