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ipvs: add backup_only flag to avoid loops
[linux-2.6.git] / include / net / ip_vs.h
blobfce8e6b66d558d8ff8bb629c4da5e358113a675e
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/list.h> /* for struct list_head */
14 #include <linux/spinlock.h> /* for struct rwlock_t */
15 #include <linux/atomic.h> /* for struct atomic_t */
16 #include <linux/compiler.h>
17 #include <linux/timer.h>
18 #include <linux/bug.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>
25 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
26 #include <linux/netfilter_ipv6/ip6_tables.h>
27 #endif
28 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
29 #include <net/netfilter/nf_conntrack.h>
30 #endif
31 #include <net/net_namespace.h> /* Netw namespace */
32
33 /*
34 * Generic access of ipvs struct
35 */
36 static inline struct netns_ipvs *net_ipvs(struct net* net)
37 {
38 return net->ipvs;
39 }
40 /*
41 * Get net ptr from skb in traffic cases
42 * use skb_sknet when call is from userland (ioctl or netlink)
43 */
44 static inline struct net *skb_net(const struct sk_buff *skb)
45 {
46 #ifdef CONFIG_NET_NS
47 #ifdef CONFIG_IP_VS_DEBUG
48 /*
49 * This is used for debug only.
50 * Start with the most likely hit
51 * End with BUG
52 */
53 if (likely(skb->dev && skb->dev->nd_net))
54 return dev_net(skb->dev);
55 if (skb_dst(skb) && skb_dst(skb)->dev)
56 return dev_net(skb_dst(skb)->dev);
57 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
58 __func__, __LINE__);
59 if (likely(skb->sk && skb->sk->sk_net))
60 return sock_net(skb->sk);
61 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
62 __func__, __LINE__);
63 BUG();
64 #else
65 return dev_net(skb->dev ? : skb_dst(skb)->dev);
66 #endif
67 #else
68 return &init_net;
69 #endif
70 }
71
72 static inline struct net *skb_sknet(const struct sk_buff *skb)
73 {
74 #ifdef CONFIG_NET_NS
75 #ifdef CONFIG_IP_VS_DEBUG
76 /* Start with the most likely hit */
77 if (likely(skb->sk && skb->sk->sk_net))
78 return sock_net(skb->sk);
79 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
80 __func__, __LINE__);
81 if (likely(skb->dev && skb->dev->nd_net))
82 return dev_net(skb->dev);
83 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
84 __func__, __LINE__);
85 BUG();
86 #else
87 return sock_net(skb->sk);
88 #endif
89 #else
90 return &init_net;
91 #endif
92 }
93 /*
94 * This one needed for single_open_net since net is stored directly in
95 * private not as a struct i.e. seq_file_net can't be used.
96 */
97 static inline struct net *seq_file_single_net(struct seq_file *seq)
98 {
99 #ifdef CONFIG_NET_NS
100 return (struct net *)seq->private;
101 #else
102 return &init_net;
103 #endif
104 }
105
106 /* Connections' size value needed by ip_vs_ctl.c */
107 extern int ip_vs_conn_tab_size;
108
109 struct ip_vs_iphdr {
110 __u32 len; /* IPv4 simply where L4 starts
111 IPv6 where L4 Transport Header starts */
112 __u32 thoff_reasm; /* Transport Header Offset in nfct_reasm skb */
113 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
114 __s16 protocol;
115 __s32 flags;
116 union nf_inet_addr saddr;
117 union nf_inet_addr daddr;
118 };
119
120 /* Dependency to module: nf_defrag_ipv6 */
121 #if defined(CONFIG_NF_DEFRAG_IPV6) || defined(CONFIG_NF_DEFRAG_IPV6_MODULE)
122 static inline struct sk_buff *skb_nfct_reasm(const struct sk_buff *skb)
123 {
124 return skb->nfct_reasm;
125 }
126 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
127 int len, void *buffer,
128 const struct ip_vs_iphdr *ipvsh)
129 {
130 if (unlikely(ipvsh->fragoffs && skb_nfct_reasm(skb)))
131 return skb_header_pointer(skb_nfct_reasm(skb),
132 ipvsh->thoff_reasm, len, buffer);
133
134 return skb_header_pointer(skb, offset, len, buffer);
135 }
136 #else
137 static inline struct sk_buff *skb_nfct_reasm(const struct sk_buff *skb)
138 {
139 return NULL;
140 }
141 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
142 int len, void *buffer,
143 const struct ip_vs_iphdr *ipvsh)
144 {
145 return skb_header_pointer(skb, offset, len, buffer);
146 }
147 #endif
148
149 static inline void
150 ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
151 {
152 const struct iphdr *iph = nh;
153
154 iphdr->len = iph->ihl * 4;
155 iphdr->fragoffs = 0;
156 iphdr->protocol = iph->protocol;
157 iphdr->saddr.ip = iph->saddr;
158 iphdr->daddr.ip = iph->daddr;
159 }
160
161 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
162 * IPv6 requires some extra work, as finding proper header position,
163 * depend on the IPv6 extension headers.
164 */
165 static inline void
166 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
167 {
168 #ifdef CONFIG_IP_VS_IPV6
169 if (af == AF_INET6) {
170 const struct ipv6hdr *iph =
171 (struct ipv6hdr *)skb_network_header(skb);
172 iphdr->saddr.in6 = iph->saddr;
173 iphdr->daddr.in6 = iph->daddr;
174 /* ipv6_find_hdr() updates len, flags, thoff_reasm */
175 iphdr->thoff_reasm = 0;
176 iphdr->len = 0;
177 iphdr->flags = 0;
178 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
179 &iphdr->fragoffs,
180 &iphdr->flags);
181 /* get proto from re-assembled packet and it's offset */
182 if (skb_nfct_reasm(skb))
183 iphdr->protocol = ipv6_find_hdr(skb_nfct_reasm(skb),
184 &iphdr->thoff_reasm,
185 -1, NULL, NULL);
186
187 } else
188 #endif
189 {
190 const struct iphdr *iph =
191 (struct iphdr *)skb_network_header(skb);
192 iphdr->len = iph->ihl * 4;
193 iphdr->fragoffs = 0;
194 iphdr->protocol = iph->protocol;
195 iphdr->saddr.ip = iph->saddr;
196 iphdr->daddr.ip = iph->daddr;
197 }
198 }
199
200 /* This function is a faster version of ip_vs_fill_iph_skb().
201 * Where we only populate {s,d}addr (and avoid calling ipv6_find_hdr()).
202 * This is used by the some of the ip_vs_*_schedule() functions.
203 * (Mostly done to avoid ABI breakage of external schedulers)
204 */
205 static inline void
206 ip_vs_fill_iph_addr_only(int af, const struct sk_buff *skb,
207 struct ip_vs_iphdr *iphdr)
208 {
209 #ifdef CONFIG_IP_VS_IPV6
210 if (af == AF_INET6) {
211 const struct ipv6hdr *iph =
212 (struct ipv6hdr *)skb_network_header(skb);
213 iphdr->saddr.in6 = iph->saddr;
214 iphdr->daddr.in6 = iph->daddr;
215 } else
216 #endif
217 {
218 const struct iphdr *iph =
219 (struct iphdr *)skb_network_header(skb);
220 iphdr->saddr.ip = iph->saddr;
221 iphdr->daddr.ip = iph->daddr;
222 }
223 }
224
225 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
226 const union nf_inet_addr *src)
227 {
228 #ifdef CONFIG_IP_VS_IPV6
229 if (af == AF_INET6)
230 dst->in6 = src->in6;
231 else
232 #endif
233 dst->ip = src->ip;
234 }
235
236 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
237 const union nf_inet_addr *b)
238 {
239 #ifdef CONFIG_IP_VS_IPV6
240 if (af == AF_INET6)
241 return ipv6_addr_equal(&a->in6, &b->in6);
242 #endif
243 return a->ip == b->ip;
244 }
245
246 #ifdef CONFIG_IP_VS_DEBUG
247 #include <linux/net.h>
248
249 extern int ip_vs_get_debug_level(void);
250
251 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
252 const union nf_inet_addr *addr,
253 int *idx)
254 {
255 int len;
256 #ifdef CONFIG_IP_VS_IPV6
257 if (af == AF_INET6)
258 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
259 &addr->in6) + 1;
260 else
261 #endif
262 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
263 &addr->ip) + 1;
264
265 *idx += len;
266 BUG_ON(*idx > buf_len + 1);
267 return &buf[*idx - len];
268 }
269
270 #define IP_VS_DBG_BUF(level, msg, ...) \
271 do { \
272 char ip_vs_dbg_buf[160]; \
273 int ip_vs_dbg_idx = 0; \
274 if (level <= ip_vs_get_debug_level()) \
275 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
276 } while (0)
277 #define IP_VS_ERR_BUF(msg...) \
278 do { \
279 char ip_vs_dbg_buf[160]; \
280 int ip_vs_dbg_idx = 0; \
281 pr_err(msg); \
282 } while (0)
283
284 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
285 #define IP_VS_DBG_ADDR(af, addr) \
286 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
287 sizeof(ip_vs_dbg_buf), addr, \
288 &ip_vs_dbg_idx)
289
290 #define IP_VS_DBG(level, msg, ...) \
291 do { \
292 if (level <= ip_vs_get_debug_level()) \
293 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
294 } while (0)
295 #define IP_VS_DBG_RL(msg, ...) \
296 do { \
297 if (net_ratelimit()) \
298 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
299 } while (0)
300 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
301 do { \
302 if (level <= ip_vs_get_debug_level()) \
303 pp->debug_packet(af, pp, skb, ofs, msg); \
304 } while (0)
305 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
306 do { \
307 if (level <= ip_vs_get_debug_level() && \
308 net_ratelimit()) \
309 pp->debug_packet(af, pp, skb, ofs, msg); \
310 } while (0)
311 #else /* NO DEBUGGING at ALL */
312 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
313 #define IP_VS_ERR_BUF(msg...) do {} while (0)
314 #define IP_VS_DBG(level, msg...) do {} while (0)
315 #define IP_VS_DBG_RL(msg...) do {} while (0)
316 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
317 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
318 #endif
319
320 #define IP_VS_BUG() BUG()
321 #define IP_VS_ERR_RL(msg, ...) \
322 do { \
323 if (net_ratelimit()) \
324 pr_err(msg, ##__VA_ARGS__); \
325 } while (0)
326
327 #ifdef CONFIG_IP_VS_DEBUG
328 #define EnterFunction(level) \
329 do { \
330 if (level <= ip_vs_get_debug_level()) \
331 printk(KERN_DEBUG \
332 pr_fmt("Enter: %s, %s line %i\n"), \
333 __func__, __FILE__, __LINE__); \
334 } while (0)
335 #define LeaveFunction(level) \
336 do { \
337 if (level <= ip_vs_get_debug_level()) \
338 printk(KERN_DEBUG \
339 pr_fmt("Leave: %s, %s line %i\n"), \
340 __func__, __FILE__, __LINE__); \
341 } while (0)
342 #else
343 #define EnterFunction(level) do {} while (0)
344 #define LeaveFunction(level) do {} while (0)
345 #endif
346
347 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
348
349
350 /*
351 * The port number of FTP service (in network order).
352 */
353 #define FTPPORT cpu_to_be16(21)
354 #define FTPDATA cpu_to_be16(20)
355
356 /*
357 * TCP State Values
358 */
359 enum {
360 IP_VS_TCP_S_NONE = 0,
361 IP_VS_TCP_S_ESTABLISHED,
362 IP_VS_TCP_S_SYN_SENT,
363 IP_VS_TCP_S_SYN_RECV,
364 IP_VS_TCP_S_FIN_WAIT,
365 IP_VS_TCP_S_TIME_WAIT,
366 IP_VS_TCP_S_CLOSE,
367 IP_VS_TCP_S_CLOSE_WAIT,
368 IP_VS_TCP_S_LAST_ACK,
369 IP_VS_TCP_S_LISTEN,
370 IP_VS_TCP_S_SYNACK,
371 IP_VS_TCP_S_LAST
372 };
373
374 /*
375 * UDP State Values
376 */
377 enum {
378 IP_VS_UDP_S_NORMAL,
379 IP_VS_UDP_S_LAST,
380 };
381
382 /*
383 * ICMP State Values
384 */
385 enum {
386 IP_VS_ICMP_S_NORMAL,
387 IP_VS_ICMP_S_LAST,
388 };
389
390 /*
391 * SCTP State Values
392 */
393 enum ip_vs_sctp_states {
394 IP_VS_SCTP_S_NONE,
395 IP_VS_SCTP_S_INIT_CLI,
396 IP_VS_SCTP_S_INIT_SER,
397 IP_VS_SCTP_S_INIT_ACK_CLI,
398 IP_VS_SCTP_S_INIT_ACK_SER,
399 IP_VS_SCTP_S_ECHO_CLI,
400 IP_VS_SCTP_S_ECHO_SER,
401 IP_VS_SCTP_S_ESTABLISHED,
402 IP_VS_SCTP_S_SHUT_CLI,
403 IP_VS_SCTP_S_SHUT_SER,
404 IP_VS_SCTP_S_SHUT_ACK_CLI,
405 IP_VS_SCTP_S_SHUT_ACK_SER,
406 IP_VS_SCTP_S_CLOSED,
407 IP_VS_SCTP_S_LAST
408 };
409
410 /*
411 * Delta sequence info structure
412 * Each ip_vs_conn has 2 (output AND input seq. changes).
413 * Only used in the VS/NAT.
414 */
415 struct ip_vs_seq {
416 __u32 init_seq; /* Add delta from this seq */
417 __u32 delta; /* Delta in sequence numbers */
418 __u32 previous_delta; /* Delta in sequence numbers
419 before last resized pkt */
420 };
421
422 /*
423 * counters per cpu
424 */
425 struct ip_vs_counters {
426 __u32 conns; /* connections scheduled */
427 __u32 inpkts; /* incoming packets */
428 __u32 outpkts; /* outgoing packets */
429 __u64 inbytes; /* incoming bytes */
430 __u64 outbytes; /* outgoing bytes */
431 };
432 /*
433 * Stats per cpu
434 */
435 struct ip_vs_cpu_stats {
436 struct ip_vs_counters ustats;
437 struct u64_stats_sync syncp;
438 };
439
440 /*
441 * IPVS statistics objects
442 */
443 struct ip_vs_estimator {
444 struct list_head list;
445
446 u64 last_inbytes;
447 u64 last_outbytes;
448 u32 last_conns;
449 u32 last_inpkts;
450 u32 last_outpkts;
451
452 u32 cps;
453 u32 inpps;
454 u32 outpps;
455 u32 inbps;
456 u32 outbps;
457 };
458
459 struct ip_vs_stats {
460 struct ip_vs_stats_user ustats; /* statistics */
461 struct ip_vs_estimator est; /* estimator */
462 struct ip_vs_cpu_stats *cpustats; /* per cpu counters */
463 spinlock_t lock; /* spin lock */
464 struct ip_vs_stats_user ustats0; /* reset values */
465 };
466
467 struct dst_entry;
468 struct iphdr;
469 struct ip_vs_conn;
470 struct ip_vs_app;
471 struct sk_buff;
472 struct ip_vs_proto_data;
473
474 struct ip_vs_protocol {
475 struct ip_vs_protocol *next;
476 char *name;
477 u16 protocol;
478 u16 num_states;
479 int dont_defrag;
480
481 void (*init)(struct ip_vs_protocol *pp);
482
483 void (*exit)(struct ip_vs_protocol *pp);
484
485 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
486
487 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
488
489 int (*conn_schedule)(int af, struct sk_buff *skb,
490 struct ip_vs_proto_data *pd,
491 int *verdict, struct ip_vs_conn **cpp,
492 struct ip_vs_iphdr *iph);
493
494 struct ip_vs_conn *
495 (*conn_in_get)(int af,
496 const struct sk_buff *skb,
497 const struct ip_vs_iphdr *iph,
498 int inverse);
499
500 struct ip_vs_conn *
501 (*conn_out_get)(int af,
502 const struct sk_buff *skb,
503 const struct ip_vs_iphdr *iph,
504 int inverse);
505
506 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
507 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
508
509 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
510 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
511
512 int (*csum_check)(int af, struct sk_buff *skb,
513 struct ip_vs_protocol *pp);
514
515 const char *(*state_name)(int state);
516
517 void (*state_transition)(struct ip_vs_conn *cp, int direction,
518 const struct sk_buff *skb,
519 struct ip_vs_proto_data *pd);
520
521 int (*register_app)(struct net *net, struct ip_vs_app *inc);
522
523 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
524
525 int (*app_conn_bind)(struct ip_vs_conn *cp);
526
527 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
528 const struct sk_buff *skb,
529 int offset,
530 const char *msg);
531
532 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
533 };
534
535 /*
536 * protocol data per netns
537 */
538 struct ip_vs_proto_data {
539 struct ip_vs_proto_data *next;
540 struct ip_vs_protocol *pp;
541 int *timeout_table; /* protocol timeout table */
542 atomic_t appcnt; /* counter of proto app incs. */
543 struct tcp_states_t *tcp_state_table;
544 };
545
546 extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
547 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
548 unsigned short proto);
549
550 struct ip_vs_conn_param {
551 struct net *net;
552 const union nf_inet_addr *caddr;
553 const union nf_inet_addr *vaddr;
554 __be16 cport;
555 __be16 vport;
556 __u16 protocol;
557 u16 af;
558
559 const struct ip_vs_pe *pe;
560 char *pe_data;
561 __u8 pe_data_len;
562 };
563
564 /*
565 * IP_VS structure allocated for each dynamically scheduled connection
566 */
567 struct ip_vs_conn {
568 struct hlist_node c_list; /* hashed list heads */
569 #ifdef CONFIG_NET_NS
570 struct net *net; /* Name space */
571 #endif
572 /* Protocol, addresses and port numbers */
573 u16 af; /* address family */
574 __be16 cport;
575 __be16 vport;
576 __be16 dport;
577 __u32 fwmark; /* Fire wall mark from skb */
578 union nf_inet_addr caddr; /* client address */
579 union nf_inet_addr vaddr; /* virtual address */
580 union nf_inet_addr daddr; /* destination address */
581 volatile __u32 flags; /* status flags */
582 __u16 protocol; /* Which protocol (TCP/UDP) */
583
584 /* counter and timer */
585 atomic_t refcnt; /* reference count */
586 struct timer_list timer; /* Expiration timer */
587 volatile unsigned long timeout; /* timeout */
588
589 /* Flags and state transition */
590 spinlock_t lock; /* lock for state transition */
591 volatile __u16 state; /* state info */
592 volatile __u16 old_state; /* old state, to be used for
593 * state transition triggerd
594 * synchronization
595 */
596 unsigned long sync_endtime; /* jiffies + sent_retries */
597
598 /* Control members */
599 struct ip_vs_conn *control; /* Master control connection */
600 atomic_t n_control; /* Number of controlled ones */
601 struct ip_vs_dest *dest; /* real server */
602 atomic_t in_pkts; /* incoming packet counter */
603
604 /* packet transmitter for different forwarding methods. If it
605 mangles the packet, it must return NF_DROP or better NF_STOLEN,
606 otherwise this must be changed to a sk_buff **.
607 NF_ACCEPT can be returned when destination is local.
608 */
609 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
610 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
611
612 /* Note: we can group the following members into a structure,
613 in order to save more space, and the following members are
614 only used in VS/NAT anyway */
615 struct ip_vs_app *app; /* bound ip_vs_app object */
616 void *app_data; /* Application private data */
617 struct ip_vs_seq in_seq; /* incoming seq. struct */
618 struct ip_vs_seq out_seq; /* outgoing seq. struct */
619
620 const struct ip_vs_pe *pe;
621 char *pe_data;
622 __u8 pe_data_len;
623 };
624
625 /*
626 * To save some memory in conn table when name space is disabled.
627 */
628 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
629 {
630 #ifdef CONFIG_NET_NS
631 return cp->net;
632 #else
633 return &init_net;
634 #endif
635 }
636 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
637 {
638 #ifdef CONFIG_NET_NS
639 cp->net = net;
640 #endif
641 }
642
643 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
644 struct net *net)
645 {
646 #ifdef CONFIG_NET_NS
647 return cp->net == net;
648 #else
649 return 1;
650 #endif
651 }
652
653 /*
654 * Extended internal versions of struct ip_vs_service_user and
655 * ip_vs_dest_user for IPv6 support.
656 *
657 * We need these to conveniently pass around service and destination
658 * options, but unfortunately, we also need to keep the old definitions to
659 * maintain userspace backwards compatibility for the setsockopt interface.
660 */
661 struct ip_vs_service_user_kern {
662 /* virtual service addresses */
663 u16 af;
664 u16 protocol;
665 union nf_inet_addr addr; /* virtual ip address */
666 u16 port;
667 u32 fwmark; /* firwall mark of service */
668
669 /* virtual service options */
670 char *sched_name;
671 char *pe_name;
672 unsigned int flags; /* virtual service flags */
673 unsigned int timeout; /* persistent timeout in sec */
674 u32 netmask; /* persistent netmask */
675 };
676
677
678 struct ip_vs_dest_user_kern {
679 /* destination server address */
680 union nf_inet_addr addr;
681 u16 port;
682
683 /* real server options */
684 unsigned int conn_flags; /* connection flags */
685 int weight; /* destination weight */
686
687 /* thresholds for active connections */
688 u32 u_threshold; /* upper threshold */
689 u32 l_threshold; /* lower threshold */
690 };
691
692
693 /*
694 * The information about the virtual service offered to the net
695 * and the forwarding entries
696 */
697 struct ip_vs_service {
698 struct list_head s_list; /* for normal service table */
699 struct list_head f_list; /* for fwmark-based service table */
700 atomic_t refcnt; /* reference counter */
701 atomic_t usecnt; /* use counter */
702
703 u16 af; /* address family */
704 __u16 protocol; /* which protocol (TCP/UDP) */
705 union nf_inet_addr addr; /* IP address for virtual service */
706 __be16 port; /* port number for the service */
707 __u32 fwmark; /* firewall mark of the service */
708 unsigned int flags; /* service status flags */
709 unsigned int timeout; /* persistent timeout in ticks */
710 __be32 netmask; /* grouping granularity */
711 struct net *net;
712
713 struct list_head destinations; /* real server d-linked list */
714 __u32 num_dests; /* number of servers */
715 struct ip_vs_stats stats; /* statistics for the service */
716 struct ip_vs_app *inc; /* bind conns to this app inc */
717
718 /* for scheduling */
719 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
720 rwlock_t sched_lock; /* lock sched_data */
721 void *sched_data; /* scheduler application data */
722
723 /* alternate persistence engine */
724 struct ip_vs_pe *pe;
725 };
726
727
728 /*
729 * The real server destination forwarding entry
730 * with ip address, port number, and so on.
731 */
732 struct ip_vs_dest {
733 struct list_head n_list; /* for the dests in the service */
734 struct list_head d_list; /* for table with all the dests */
735
736 u16 af; /* address family */
737 __be16 port; /* port number of the server */
738 union nf_inet_addr addr; /* IP address of the server */
739 volatile unsigned int flags; /* dest status flags */
740 atomic_t conn_flags; /* flags to copy to conn */
741 atomic_t weight; /* server weight */
742
743 atomic_t refcnt; /* reference counter */
744 struct ip_vs_stats stats; /* statistics */
745
746 /* connection counters and thresholds */
747 atomic_t activeconns; /* active connections */
748 atomic_t inactconns; /* inactive connections */
749 atomic_t persistconns; /* persistent connections */
750 __u32 u_threshold; /* upper threshold */
751 __u32 l_threshold; /* lower threshold */
752
753 /* for destination cache */
754 spinlock_t dst_lock; /* lock of dst_cache */
755 struct dst_entry *dst_cache; /* destination cache entry */
756 u32 dst_rtos; /* RT_TOS(tos) for dst */
757 u32 dst_cookie;
758 union nf_inet_addr dst_saddr;
759
760 /* for virtual service */
761 struct ip_vs_service *svc; /* service it belongs to */
762 __u16 protocol; /* which protocol (TCP/UDP) */
763 __be16 vport; /* virtual port number */
764 union nf_inet_addr vaddr; /* virtual IP address */
765 __u32 vfwmark; /* firewall mark of service */
766 };
767
768
769 /*
770 * The scheduler object
771 */
772 struct ip_vs_scheduler {
773 struct list_head n_list; /* d-linked list head */
774 char *name; /* scheduler name */
775 atomic_t refcnt; /* reference counter */
776 struct module *module; /* THIS_MODULE/NULL */
777
778 /* scheduler initializing service */
779 int (*init_service)(struct ip_vs_service *svc);
780 /* scheduling service finish */
781 int (*done_service)(struct ip_vs_service *svc);
782 /* scheduler updating service */
783 int (*update_service)(struct ip_vs_service *svc);
784
785 /* selecting a server from the given service */
786 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
787 const struct sk_buff *skb);
788 };
789
790 /* The persistence engine object */
791 struct ip_vs_pe {
792 struct list_head n_list; /* d-linked list head */
793 char *name; /* scheduler name */
794 atomic_t refcnt; /* reference counter */
795 struct module *module; /* THIS_MODULE/NULL */
796
797 /* get the connection template, if any */
798 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
799 bool (*ct_match)(const struct ip_vs_conn_param *p,
800 struct ip_vs_conn *ct);
801 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
802 bool inverse);
803 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
804 };
805
806 /*
807 * The application module object (a.k.a. app incarnation)
808 */
809 struct ip_vs_app {
810 struct list_head a_list; /* member in app list */
811 int type; /* IP_VS_APP_TYPE_xxx */
812 char *name; /* application module name */
813 __u16 protocol;
814 struct module *module; /* THIS_MODULE/NULL */
815 struct list_head incs_list; /* list of incarnations */
816
817 /* members for application incarnations */
818 struct list_head p_list; /* member in proto app list */
819 struct ip_vs_app *app; /* its real application */
820 __be16 port; /* port number in net order */
821 atomic_t usecnt; /* usage counter */
822
823 /*
824 * output hook: Process packet in inout direction, diff set for TCP.
825 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
826 * 2=Mangled but checksum was not updated
827 */
828 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
829 struct sk_buff *, int *diff);
830
831 /*
832 * input hook: Process packet in outin direction, diff set for TCP.
833 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
834 * 2=Mangled but checksum was not updated
835 */
836 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
837 struct sk_buff *, int *diff);
838
839 /* ip_vs_app initializer */
840 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
841
842 /* ip_vs_app finish */
843 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
844
845
846 /* not used now */
847 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
848 struct ip_vs_protocol *);
849
850 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
851
852 int * timeout_table;
853 int * timeouts;
854 int timeouts_size;
855
856 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
857 int *verdict, struct ip_vs_conn **cpp);
858
859 struct ip_vs_conn *
860 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
861 const struct iphdr *iph, int inverse);
862
863 struct ip_vs_conn *
864 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
865 const struct iphdr *iph, int inverse);
866
867 int (*state_transition)(struct ip_vs_conn *cp, int direction,
868 const struct sk_buff *skb,
869 struct ip_vs_app *app);
870
871 void (*timeout_change)(struct ip_vs_app *app, int flags);
872 };
873
874 struct ipvs_master_sync_state {
875 struct list_head sync_queue;
876 struct ip_vs_sync_buff *sync_buff;
877 int sync_queue_len;
878 unsigned int sync_queue_delay;
879 struct task_struct *master_thread;
880 struct delayed_work master_wakeup_work;
881 struct netns_ipvs *ipvs;
882 };
883
884 /* IPVS in network namespace */
885 struct netns_ipvs {
886 int gen; /* Generation */
887 int enable; /* enable like nf_hooks do */
888 /*
889 * Hash table: for real service lookups
890 */
891 #define IP_VS_RTAB_BITS 4
892 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
893 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
894
895 struct list_head rs_table[IP_VS_RTAB_SIZE];
896 /* ip_vs_app */
897 struct list_head app_list;
898 /* ip_vs_proto */
899 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
900 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
901 /* ip_vs_proto_tcp */
902 #ifdef CONFIG_IP_VS_PROTO_TCP
903 #define TCP_APP_TAB_BITS 4
904 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
905 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
906 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
907 spinlock_t tcp_app_lock;
908 #endif
909 /* ip_vs_proto_udp */
910 #ifdef CONFIG_IP_VS_PROTO_UDP
911 #define UDP_APP_TAB_BITS 4
912 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
913 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
914 struct list_head udp_apps[UDP_APP_TAB_SIZE];
915 spinlock_t udp_app_lock;
916 #endif
917 /* ip_vs_proto_sctp */
918 #ifdef CONFIG_IP_VS_PROTO_SCTP
919 #define SCTP_APP_TAB_BITS 4
920 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
921 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
922 /* Hash table for SCTP application incarnations */
923 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
924 spinlock_t sctp_app_lock;
925 #endif
926 /* ip_vs_conn */
927 atomic_t conn_count; /* connection counter */
928
929 /* ip_vs_ctl */
930 struct ip_vs_stats tot_stats; /* Statistics & est. */
931
932 int num_services; /* no of virtual services */
933
934 rwlock_t rs_lock; /* real services table */
935 /* Trash for destinations */
936 struct list_head dest_trash;
937 /* Service counters */
938 atomic_t ftpsvc_counter;
939 atomic_t nullsvc_counter;
940
941 #ifdef CONFIG_SYSCTL
942 /* 1/rate drop and drop-entry variables */
943 struct delayed_work defense_work; /* Work handler */
944 int drop_rate;
945 int drop_counter;
946 atomic_t dropentry;
947 /* locks in ctl.c */
948 spinlock_t dropentry_lock; /* drop entry handling */
949 spinlock_t droppacket_lock; /* drop packet handling */
950 spinlock_t securetcp_lock; /* state and timeout tables */
951
952 /* sys-ctl struct */
953 struct ctl_table_header *sysctl_hdr;
954 struct ctl_table *sysctl_tbl;
955 #endif
956
957 /* sysctl variables */
958 int sysctl_amemthresh;
959 int sysctl_am_droprate;
960 int sysctl_drop_entry;
961 int sysctl_drop_packet;
962 int sysctl_secure_tcp;
963 #ifdef CONFIG_IP_VS_NFCT
964 int sysctl_conntrack;
965 #endif
966 int sysctl_snat_reroute;
967 int sysctl_sync_ver;
968 int sysctl_sync_ports;
969 int sysctl_sync_qlen_max;
970 int sysctl_sync_sock_size;
971 int sysctl_cache_bypass;
972 int sysctl_expire_nodest_conn;
973 int sysctl_expire_quiescent_template;
974 int sysctl_sync_threshold[2];
975 unsigned int sysctl_sync_refresh_period;
976 int sysctl_sync_retries;
977 int sysctl_nat_icmp_send;
978 int sysctl_pmtu_disc;
979 int sysctl_backup_only;
980
981 /* ip_vs_lblc */
982 int sysctl_lblc_expiration;
983 struct ctl_table_header *lblc_ctl_header;
984 struct ctl_table *lblc_ctl_table;
985 /* ip_vs_lblcr */
986 int sysctl_lblcr_expiration;
987 struct ctl_table_header *lblcr_ctl_header;
988 struct ctl_table *lblcr_ctl_table;
989 /* ip_vs_est */
990 struct list_head est_list; /* estimator list */
991 spinlock_t est_lock;
992 struct timer_list est_timer; /* Estimation timer */
993 /* ip_vs_sync */
994 spinlock_t sync_lock;
995 struct ipvs_master_sync_state *ms;
996 spinlock_t sync_buff_lock;
997 struct task_struct **backup_threads;
998 int threads_mask;
999 int send_mesg_maxlen;
1000 int recv_mesg_maxlen;
1001 volatile int sync_state;
1002 volatile int master_syncid;
1003 volatile int backup_syncid;
1004 struct mutex sync_mutex;
1005 /* multicast interface name */
1006 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
1007 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
1008 /* net name space ptr */
1009 struct net *net; /* Needed by timer routines */
1010 };
1011
1012 #define DEFAULT_SYNC_THRESHOLD 3
1013 #define DEFAULT_SYNC_PERIOD 50
1014 #define DEFAULT_SYNC_VER 1
1015 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
1016 #define DEFAULT_SYNC_RETRIES 0
1017 #define IPVS_SYNC_WAKEUP_RATE 8
1018 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1019 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
1020 #define IPVS_SYNC_CHECK_PERIOD HZ
1021 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1022 #define IPVS_SYNC_PORTS_MAX (1 << 6)
1023
1024 #ifdef CONFIG_SYSCTL
1025
1026 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1027 {
1028 return ipvs->sysctl_sync_threshold[0];
1029 }
1030
1031 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1032 {
1033 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1034 }
1035
1036 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1037 {
1038 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1039 }
1040
1041 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1042 {
1043 return ipvs->sysctl_sync_retries;
1044 }
1045
1046 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1047 {
1048 return ipvs->sysctl_sync_ver;
1049 }
1050
1051 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1052 {
1053 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1054 }
1055
1056 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1057 {
1058 return ipvs->sysctl_sync_qlen_max;
1059 }
1060
1061 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1062 {
1063 return ipvs->sysctl_sync_sock_size;
1064 }
1065
1066 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1067 {
1068 return ipvs->sysctl_pmtu_disc;
1069 }
1070
1071 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1072 {
1073 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1074 ipvs->sysctl_backup_only;
1075 }
1076
1077 #else
1078
1079 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1080 {
1081 return DEFAULT_SYNC_THRESHOLD;
1082 }
1083
1084 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1085 {
1086 return DEFAULT_SYNC_PERIOD;
1087 }
1088
1089 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1090 {
1091 return DEFAULT_SYNC_REFRESH_PERIOD;
1092 }
1093
1094 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1095 {
1096 return DEFAULT_SYNC_RETRIES & 3;
1097 }
1098
1099 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1100 {
1101 return DEFAULT_SYNC_VER;
1102 }
1103
1104 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1105 {
1106 return 1;
1107 }
1108
1109 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1110 {
1111 return IPVS_SYNC_QLEN_MAX;
1112 }
1113
1114 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1115 {
1116 return 0;
1117 }
1118
1119 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1120 {
1121 return 1;
1122 }
1123
1124 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1125 {
1126 return 0;
1127 }
1128
1129 #endif
1130
1131 /*
1132 * IPVS core functions
1133 * (from ip_vs_core.c)
1134 */
1135 extern const char *ip_vs_proto_name(unsigned int proto);
1136 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
1137 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1138
1139 #define IP_VS_APP_TYPE_FTP 1
1140
1141 /*
1142 * ip_vs_conn handling functions
1143 * (from ip_vs_conn.c)
1144 */
1145
1146 enum {
1147 IP_VS_DIR_INPUT = 0,
1148 IP_VS_DIR_OUTPUT,
1149 IP_VS_DIR_INPUT_ONLY,
1150 IP_VS_DIR_LAST,
1151 };
1152
1153 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1154 const union nf_inet_addr *caddr,
1155 __be16 cport,
1156 const union nf_inet_addr *vaddr,
1157 __be16 vport,
1158 struct ip_vs_conn_param *p)
1159 {
1160 p->net = net;
1161 p->af = af;
1162 p->protocol = protocol;
1163 p->caddr = caddr;
1164 p->cport = cport;
1165 p->vaddr = vaddr;
1166 p->vport = vport;
1167 p->pe = NULL;
1168 p->pe_data = NULL;
1169 }
1170
1171 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1172 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1173
1174 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1175 const struct ip_vs_iphdr *iph,
1176 int inverse);
1177
1178 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1179
1180 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1181 const struct ip_vs_iphdr *iph,
1182 int inverse);
1183
1184 /* put back the conn without restarting its timer */
1185 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1186 {
1187 atomic_dec(&cp->refcnt);
1188 }
1189 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1190 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1191
1192 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1193 const union nf_inet_addr *daddr,
1194 __be16 dport, unsigned int flags,
1195 struct ip_vs_dest *dest, __u32 fwmark);
1196 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1197
1198 extern const char * ip_vs_state_name(__u16 proto, int state);
1199
1200 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1201 extern int ip_vs_check_template(struct ip_vs_conn *ct);
1202 extern void ip_vs_random_dropentry(struct net *net);
1203 extern int ip_vs_conn_init(void);
1204 extern void ip_vs_conn_cleanup(void);
1205
1206 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1207 {
1208 struct ip_vs_conn *ctl_cp = cp->control;
1209 if (!ctl_cp) {
1210 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1211 "%s:%d to %s:%d\n",
1212 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1213 ntohs(cp->cport),
1214 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1215 ntohs(cp->vport));
1216
1217 return;
1218 }
1219
1220 IP_VS_DBG_BUF(7, "DELeting control for: "
1221 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1222 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1223 ntohs(cp->cport),
1224 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1225 ntohs(ctl_cp->cport));
1226
1227 cp->control = NULL;
1228 if (atomic_read(&ctl_cp->n_control) == 0) {
1229 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1230 "%s:%d to %s:%d\n",
1231 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1232 ntohs(cp->cport),
1233 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1234 ntohs(cp->vport));
1235
1236 return;
1237 }
1238 atomic_dec(&ctl_cp->n_control);
1239 }
1240
1241 static inline void
1242 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1243 {
1244 if (cp->control) {
1245 IP_VS_ERR_BUF("request control ADD for already controlled: "
1246 "%s:%d to %s:%d\n",
1247 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1248 ntohs(cp->cport),
1249 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1250 ntohs(cp->vport));
1251
1252 ip_vs_control_del(cp);
1253 }
1254
1255 IP_VS_DBG_BUF(7, "ADDing control for: "
1256 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1257 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1258 ntohs(cp->cport),
1259 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1260 ntohs(ctl_cp->cport));
1261
1262 cp->control = ctl_cp;
1263 atomic_inc(&ctl_cp->n_control);
1264 }
1265
1266 /*
1267 * IPVS netns init & cleanup functions
1268 */
1269 extern int ip_vs_estimator_net_init(struct net *net);
1270 extern int ip_vs_control_net_init(struct net *net);
1271 extern int ip_vs_protocol_net_init(struct net *net);
1272 extern int ip_vs_app_net_init(struct net *net);
1273 extern int ip_vs_conn_net_init(struct net *net);
1274 extern int ip_vs_sync_net_init(struct net *net);
1275 extern void ip_vs_conn_net_cleanup(struct net *net);
1276 extern void ip_vs_app_net_cleanup(struct net *net);
1277 extern void ip_vs_protocol_net_cleanup(struct net *net);
1278 extern void ip_vs_control_net_cleanup(struct net *net);
1279 extern void ip_vs_estimator_net_cleanup(struct net *net);
1280 extern void ip_vs_sync_net_cleanup(struct net *net);
1281 extern void ip_vs_service_net_cleanup(struct net *net);
1282
1283 /*
1284 * IPVS application functions
1285 * (from ip_vs_app.c)
1286 */
1287 #define IP_VS_APP_MAX_PORTS 8
1288 extern struct ip_vs_app *register_ip_vs_app(struct net *net,
1289 struct ip_vs_app *app);
1290 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1291 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1292 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1293 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1294 __u16 proto, __u16 port);
1295 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1296 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1297
1298 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1299 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1300
1301 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1302 void ip_vs_unbind_pe(struct ip_vs_service *svc);
1303 int register_ip_vs_pe(struct ip_vs_pe *pe);
1304 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1305 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1306 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1307
1308 /*
1309 * Use a #define to avoid all of module.h just for these trivial ops
1310 */
1311 #define ip_vs_pe_get(pe) \
1312 if (pe && pe->module) \
1313 __module_get(pe->module);
1314
1315 #define ip_vs_pe_put(pe) \
1316 if (pe && pe->module) \
1317 module_put(pe->module);
1318
1319 /*
1320 * IPVS protocol functions (from ip_vs_proto.c)
1321 */
1322 extern int ip_vs_protocol_init(void);
1323 extern void ip_vs_protocol_cleanup(void);
1324 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1325 extern int *ip_vs_create_timeout_table(int *table, int size);
1326 extern int
1327 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1328 const char *name, int to);
1329 extern void
1330 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1331 const struct sk_buff *skb,
1332 int offset, const char *msg);
1333
1334 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1335 extern struct ip_vs_protocol ip_vs_protocol_udp;
1336 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1337 extern struct ip_vs_protocol ip_vs_protocol_esp;
1338 extern struct ip_vs_protocol ip_vs_protocol_ah;
1339 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1340
1341 /*
1342 * Registering/unregistering scheduler functions
1343 * (from ip_vs_sched.c)
1344 */
1345 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1346 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1347 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1348 struct ip_vs_scheduler *scheduler);
1349 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1350 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1351 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1352 extern struct ip_vs_conn *
1353 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1354 struct ip_vs_proto_data *pd, int *ignored,
1355 struct ip_vs_iphdr *iph);
1356 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1357 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1358
1359 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1360
1361
1362 /*
1363 * IPVS control data and functions (from ip_vs_ctl.c)
1364 */
1365 extern struct ip_vs_stats ip_vs_stats;
1366 extern int sysctl_ip_vs_sync_ver;
1367
1368 extern struct ip_vs_service *
1369 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1370 const union nf_inet_addr *vaddr, __be16 vport);
1371
1372 static inline void ip_vs_service_put(struct ip_vs_service *svc)
1373 {
1374 atomic_dec(&svc->usecnt);
1375 }
1376
1377 extern struct ip_vs_dest *
1378 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1379 const union nf_inet_addr *daddr, __be16 dport);
1380
1381 extern int ip_vs_use_count_inc(void);
1382 extern void ip_vs_use_count_dec(void);
1383 extern int ip_vs_register_nl_ioctl(void);
1384 extern void ip_vs_unregister_nl_ioctl(void);
1385 extern int ip_vs_control_init(void);
1386 extern void ip_vs_control_cleanup(void);
1387 extern struct ip_vs_dest *
1388 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1389 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1390 __u16 protocol, __u32 fwmark, __u32 flags);
1391 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1392
1393
1394 /*
1395 * IPVS sync daemon data and function prototypes
1396 * (from ip_vs_sync.c)
1397 */
1398 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1399 __u8 syncid);
1400 extern int stop_sync_thread(struct net *net, int state);
1401 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1402
1403
1404 /*
1405 * IPVS rate estimator prototypes (from ip_vs_est.c)
1406 */
1407 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1408 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1409 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1410 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1411 struct ip_vs_stats *stats);
1412
1413 /*
1414 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1415 */
1416 extern int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1417 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1418 extern int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1419 struct ip_vs_protocol *pp,
1420 struct ip_vs_iphdr *iph);
1421 extern int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1422 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1423 extern int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1424 struct ip_vs_protocol *pp,
1425 struct ip_vs_iphdr *iph);
1426 extern int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1427 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1428 extern int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1429 struct ip_vs_protocol *pp, int offset,
1430 unsigned int hooknum, struct ip_vs_iphdr *iph);
1431 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1432
1433 #ifdef CONFIG_IP_VS_IPV6
1434 extern int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1435 struct ip_vs_protocol *pp,
1436 struct ip_vs_iphdr *iph);
1437 extern int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1438 struct ip_vs_protocol *pp,
1439 struct ip_vs_iphdr *iph);
1440 extern int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1441 struct ip_vs_protocol *pp,
1442 struct ip_vs_iphdr *iph);
1443 extern int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445 extern int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, int offset,
1447 unsigned int hooknum, struct ip_vs_iphdr *iph);
1448 #endif
1449
1450 #ifdef CONFIG_SYSCTL
1451 /*
1452 * This is a simple mechanism to ignore packets when
1453 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1454 * we start to drop 1/rate of the packets
1455 */
1456
1457 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1458 {
1459 if (!ipvs->drop_rate)
1460 return 0;
1461 if (--ipvs->drop_counter > 0)
1462 return 0;
1463 ipvs->drop_counter = ipvs->drop_rate;
1464 return 1;
1465 }
1466 #else
1467 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1468 #endif
1469
1470 /*
1471 * ip_vs_fwd_tag returns the forwarding tag of the connection
1472 */
1473 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1474
1475 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1476 {
1477 char fwd;
1478
1479 switch (IP_VS_FWD_METHOD(cp)) {
1480 case IP_VS_CONN_F_MASQ:
1481 fwd = 'M'; break;
1482 case IP_VS_CONN_F_LOCALNODE:
1483 fwd = 'L'; break;
1484 case IP_VS_CONN_F_TUNNEL:
1485 fwd = 'T'; break;
1486 case IP_VS_CONN_F_DROUTE:
1487 fwd = 'R'; break;
1488 case IP_VS_CONN_F_BYPASS:
1489 fwd = 'B'; break;
1490 default:
1491 fwd = '?'; break;
1492 }
1493 return fwd;
1494 }
1495
1496 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1497 struct ip_vs_conn *cp, int dir);
1498
1499 #ifdef CONFIG_IP_VS_IPV6
1500 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1501 struct ip_vs_conn *cp, int dir);
1502 #endif
1503
1504 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1505
1506 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1507 {
1508 __be32 diff[2] = { ~old, new };
1509
1510 return csum_partial(diff, sizeof(diff), oldsum);
1511 }
1512
1513 #ifdef CONFIG_IP_VS_IPV6
1514 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1515 __wsum oldsum)
1516 {
1517 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1518 new[3], new[2], new[1], new[0] };
1519
1520 return csum_partial(diff, sizeof(diff), oldsum);
1521 }
1522 #endif
1523
1524 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1525 {
1526 __be16 diff[2] = { ~old, new };
1527
1528 return csum_partial(diff, sizeof(diff), oldsum);
1529 }
1530
1531 /*
1532 * Forget current conntrack (unconfirmed) and attach notrack entry
1533 */
1534 static inline void ip_vs_notrack(struct sk_buff *skb)
1535 {
1536 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1537 enum ip_conntrack_info ctinfo;
1538 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1539
1540 if (!ct || !nf_ct_is_untracked(ct)) {
1541 nf_conntrack_put(skb->nfct);
1542 skb->nfct = &nf_ct_untracked_get()->ct_general;
1543 skb->nfctinfo = IP_CT_NEW;
1544 nf_conntrack_get(skb->nfct);
1545 }
1546 #endif
1547 }
1548
1549 #ifdef CONFIG_IP_VS_NFCT
1550 /*
1551 * Netfilter connection tracking
1552 * (from ip_vs_nfct.c)
1553 */
1554 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1555 {
1556 #ifdef CONFIG_SYSCTL
1557 return ipvs->sysctl_conntrack;
1558 #else
1559 return 0;
1560 #endif
1561 }
1562
1563 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1564 int outin);
1565 extern int ip_vs_confirm_conntrack(struct sk_buff *skb);
1566 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1567 struct ip_vs_conn *cp, u_int8_t proto,
1568 const __be16 port, int from_rs);
1569 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1570
1571 #else
1572
1573 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1574 {
1575 return 0;
1576 }
1577
1578 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1579 struct ip_vs_conn *cp, int outin)
1580 {
1581 }
1582
1583 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1584 {
1585 return NF_ACCEPT;
1586 }
1587
1588 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1589 {
1590 }
1591 /* CONFIG_IP_VS_NFCT */
1592 #endif
1593
1594 static inline unsigned int
1595 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1596 {
1597 /*
1598 * We think the overhead of processing active connections is 256
1599 * times higher than that of inactive connections in average. (This
1600 * 256 times might not be accurate, we will change it later) We
1601 * use the following formula to estimate the overhead now:
1602 * dest->activeconns*256 + dest->inactconns
1603 */
1604 return (atomic_read(&dest->activeconns) << 8) +
1605 atomic_read(&dest->inactconns);
1606 }
1607
1608 #endif /* _NET_IP_VS_H */
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