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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IP Virtual Server
3 * data structure and functionality definitions
4 */
5
Julius Volzbc4768e2008-07-31 20:45:24 -07006#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
Julius Volzbc4768e2008-07-31 20:45:24 -07009#include <linux/ip_vs.h> /* definitions shared with userland */
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
Julius Volzbc4768e2008-07-31 20:45:24 -070011/* old ipvsadm versions still include this file directly */
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#ifdef __KERNEL__
13
Julius Volzbc4768e2008-07-31 20:45:24 -070014#include <asm/types.h> /* for __uXX types */
15
16#include <linux/sysctl.h> /* for ctl_path */
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/list.h> /* for struct list_head */
18#include <linux/spinlock.h> /* for struct rwlock_t */
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/atomic.h> /* for struct atomic_t */
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/compiler.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020021#include <linux/timer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020023#include <net/checksum.h>
Julius Volze7ade462008-09-02 15:55:33 +020024#include <linux/netfilter.h> /* for union nf_inet_addr */
KOVACS Krisztian1668e012008-10-01 07:33:10 -070025#include <linux/ip.h>
Julius Volze7ade462008-09-02 15:55:33 +020026#include <linux/ipv6.h> /* for struct ipv6hdr */
27#include <net/ipv6.h> /* for ipv6_addr_copy */
Julian Anastasovcf356d62010-10-17 16:21:07 +030028#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
Julian Anastasovf4bc17c2010-09-21 17:35:41 +020029#include <net/netfilter/nf_conntrack.h>
30#endif
Catalin(ux) M. BOIE6f7edb42010-01-05 05:50:24 +010031
32/* Connections' size value needed by ip_vs_ctl.c */
33extern int ip_vs_conn_tab_size;
34
35
Julius Volz64aae3c2008-09-02 15:55:34 +020036struct ip_vs_iphdr {
37 int len;
38 __u8 protocol;
39 union nf_inet_addr saddr;
40 union nf_inet_addr daddr;
41};
42
43static inline void
44ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
45{
46#ifdef CONFIG_IP_VS_IPV6
47 if (af == AF_INET6) {
48 const struct ipv6hdr *iph = nh;
49 iphdr->len = sizeof(struct ipv6hdr);
50 iphdr->protocol = iph->nexthdr;
51 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
52 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
53 } else
54#endif
55 {
56 const struct iphdr *iph = nh;
57 iphdr->len = iph->ihl * 4;
58 iphdr->protocol = iph->protocol;
59 iphdr->saddr.ip = iph->saddr;
60 iphdr->daddr.ip = iph->daddr;
61 }
62}
63
64static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
65 const union nf_inet_addr *src)
66{
67#ifdef CONFIG_IP_VS_IPV6
68 if (af == AF_INET6)
69 ipv6_addr_copy(&dst->in6, &src->in6);
70 else
71#endif
72 dst->ip = src->ip;
73}
74
75static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
76 const union nf_inet_addr *b)
77{
78#ifdef CONFIG_IP_VS_IPV6
79 if (af == AF_INET6)
80 return ipv6_addr_equal(&a->in6, &b->in6);
81#endif
82 return a->ip == b->ip;
83}
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#ifdef CONFIG_IP_VS_DEBUG
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020086#include <linux/net.h>
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088extern int ip_vs_get_debug_level(void);
Julius Volzc842a3a2008-09-02 15:55:35 +020089
90static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
91 const union nf_inet_addr *addr,
92 int *idx)
93{
94 int len;
95#ifdef CONFIG_IP_VS_IPV6
96 if (af == AF_INET6)
Harvey Harrison5b095d9892008-10-29 12:52:50 -070097 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
Harvey Harrison0c6ce782008-10-28 16:09:23 -070098 &addr->in6) + 1;
Julius Volzc842a3a2008-09-02 15:55:35 +020099 else
100#endif
Harvey Harrison3685f25d2008-10-31 00:56:49 -0700101 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
102 &addr->ip) + 1;
Julius Volzc842a3a2008-09-02 15:55:35 +0200103
104 *idx += len;
105 BUG_ON(*idx > buf_len + 1);
106 return &buf[*idx - len];
107}
108
Hannes Eder9aada7a2009-07-30 14:29:44 -0700109#define IP_VS_DBG_BUF(level, msg, ...) \
110 do { \
111 char ip_vs_dbg_buf[160]; \
112 int ip_vs_dbg_idx = 0; \
113 if (level <= ip_vs_get_debug_level()) \
114 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
115 } while (0)
116#define IP_VS_ERR_BUF(msg...) \
117 do { \
118 char ip_vs_dbg_buf[160]; \
119 int ip_vs_dbg_idx = 0; \
120 pr_err(msg); \
121 } while (0)
Julius Volzc842a3a2008-09-02 15:55:35 +0200122
123/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
Hannes Eder9aada7a2009-07-30 14:29:44 -0700124#define IP_VS_DBG_ADDR(af, addr) \
125 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
126 sizeof(ip_vs_dbg_buf), addr, \
127 &ip_vs_dbg_idx)
Julius Volzc842a3a2008-09-02 15:55:35 +0200128
Hannes Eder9aada7a2009-07-30 14:29:44 -0700129#define IP_VS_DBG(level, msg, ...) \
130 do { \
131 if (level <= ip_vs_get_debug_level()) \
132 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
133 } while (0)
134#define IP_VS_DBG_RL(msg, ...) \
135 do { \
136 if (net_ratelimit()) \
137 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
138 } while (0)
Julian Anastasov0d796412010-10-17 16:46:17 +0300139#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
Hannes Eder9aada7a2009-07-30 14:29:44 -0700140 do { \
141 if (level <= ip_vs_get_debug_level()) \
Julian Anastasov0d796412010-10-17 16:46:17 +0300142 pp->debug_packet(af, pp, skb, ofs, msg); \
Hannes Eder9aada7a2009-07-30 14:29:44 -0700143 } while (0)
Julian Anastasov0d796412010-10-17 16:46:17 +0300144#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
Hannes Eder9aada7a2009-07-30 14:29:44 -0700145 do { \
146 if (level <= ip_vs_get_debug_level() && \
147 net_ratelimit()) \
Julian Anastasov0d796412010-10-17 16:46:17 +0300148 pp->debug_packet(af, pp, skb, ofs, msg); \
Hannes Eder9aada7a2009-07-30 14:29:44 -0700149 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150#else /* NO DEBUGGING at ALL */
Julius Volzc842a3a2008-09-02 15:55:35 +0200151#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
152#define IP_VS_ERR_BUF(msg...) do {} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153#define IP_VS_DBG(level, msg...) do {} while (0)
154#define IP_VS_DBG_RL(msg...) do {} while (0)
Julian Anastasov0d796412010-10-17 16:46:17 +0300155#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
156#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157#endif
158
159#define IP_VS_BUG() BUG()
Hannes Eder1e3e2382009-08-02 11:05:41 +0000160#define IP_VS_ERR_RL(msg, ...) \
Hannes Eder9aada7a2009-07-30 14:29:44 -0700161 do { \
162 if (net_ratelimit()) \
Hannes Eder1e3e2382009-08-02 11:05:41 +0000163 pr_err(msg, ##__VA_ARGS__); \
Hannes Eder9aada7a2009-07-30 14:29:44 -0700164 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166#ifdef CONFIG_IP_VS_DEBUG
167#define EnterFunction(level) \
Hannes Eder9aada7a2009-07-30 14:29:44 -0700168 do { \
169 if (level <= ip_vs_get_debug_level()) \
170 printk(KERN_DEBUG \
171 pr_fmt("Enter: %s, %s line %i\n"), \
172 __func__, __FILE__, __LINE__); \
173 } while (0)
174#define LeaveFunction(level) \
175 do { \
176 if (level <= ip_vs_get_debug_level()) \
177 printk(KERN_DEBUG \
178 pr_fmt("Leave: %s, %s line %i\n"), \
179 __func__, __FILE__, __LINE__); \
180 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181#else
182#define EnterFunction(level) do {} while (0)
183#define LeaveFunction(level) do {} while (0)
184#endif
185
186#define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
187
188
189/*
190 * The port number of FTP service (in network order).
191 */
Harvey Harrisonf3a7c662009-02-14 22:58:35 -0800192#define FTPPORT cpu_to_be16(21)
193#define FTPDATA cpu_to_be16(20)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 * TCP State Values
197 */
198enum {
199 IP_VS_TCP_S_NONE = 0,
200 IP_VS_TCP_S_ESTABLISHED,
201 IP_VS_TCP_S_SYN_SENT,
202 IP_VS_TCP_S_SYN_RECV,
203 IP_VS_TCP_S_FIN_WAIT,
204 IP_VS_TCP_S_TIME_WAIT,
205 IP_VS_TCP_S_CLOSE,
206 IP_VS_TCP_S_CLOSE_WAIT,
207 IP_VS_TCP_S_LAST_ACK,
208 IP_VS_TCP_S_LISTEN,
209 IP_VS_TCP_S_SYNACK,
210 IP_VS_TCP_S_LAST
211};
212
213/*
214 * UDP State Values
215 */
216enum {
217 IP_VS_UDP_S_NORMAL,
218 IP_VS_UDP_S_LAST,
219};
220
221/*
222 * ICMP State Values
223 */
224enum {
225 IP_VS_ICMP_S_NORMAL,
226 IP_VS_ICMP_S_LAST,
227};
228
229/*
Venkata Mohan Reddy2906f662010-02-18 12:31:05 +0100230 * SCTP State Values
231 */
232enum ip_vs_sctp_states {
233 IP_VS_SCTP_S_NONE,
234 IP_VS_SCTP_S_INIT_CLI,
235 IP_VS_SCTP_S_INIT_SER,
236 IP_VS_SCTP_S_INIT_ACK_CLI,
237 IP_VS_SCTP_S_INIT_ACK_SER,
238 IP_VS_SCTP_S_ECHO_CLI,
239 IP_VS_SCTP_S_ECHO_SER,
240 IP_VS_SCTP_S_ESTABLISHED,
241 IP_VS_SCTP_S_SHUT_CLI,
242 IP_VS_SCTP_S_SHUT_SER,
243 IP_VS_SCTP_S_SHUT_ACK_CLI,
244 IP_VS_SCTP_S_SHUT_ACK_SER,
245 IP_VS_SCTP_S_CLOSED,
246 IP_VS_SCTP_S_LAST
247};
248
249/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 * Delta sequence info structure
251 * Each ip_vs_conn has 2 (output AND input seq. changes).
252 * Only used in the VS/NAT.
253 */
254struct ip_vs_seq {
255 __u32 init_seq; /* Add delta from this seq */
256 __u32 delta; /* Delta in sequence numbers */
257 __u32 previous_delta; /* Delta in sequence numbers
258 before last resized pkt */
259};
260
261
262/*
Sven Wegener3a14a3132008-08-10 18:24:41 +0000263 * IPVS statistics objects
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 */
Sven Wegener3a14a3132008-08-10 18:24:41 +0000265struct ip_vs_estimator {
266 struct list_head list;
267
268 u64 last_inbytes;
269 u64 last_outbytes;
270 u32 last_conns;
271 u32 last_inpkts;
272 u32 last_outpkts;
273
274 u32 cps;
275 u32 inpps;
276 u32 outpps;
277 u32 inbps;
278 u32 outbps;
279};
280
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000281struct ip_vs_stats {
Sven Wegenere9c0ce22008-09-08 13:39:04 +0200282 struct ip_vs_stats_user ustats; /* statistics */
283 struct ip_vs_estimator est; /* estimator */
Sven Wegener3a14a3132008-08-10 18:24:41 +0000284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 spinlock_t lock; /* spin lock */
286};
287
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200288struct dst_entry;
289struct iphdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290struct ip_vs_conn;
291struct ip_vs_app;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200292struct sk_buff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294struct ip_vs_protocol {
295 struct ip_vs_protocol *next;
296 char *name;
Julian Anastasov2ad17de2008-04-29 03:21:23 -0700297 u16 protocol;
298 u16 num_states;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 int dont_defrag;
300 atomic_t appcnt; /* counter of proto app incs */
301 int *timeout_table; /* protocol timeout table */
302
303 void (*init)(struct ip_vs_protocol *pp);
304
305 void (*exit)(struct ip_vs_protocol *pp);
306
Julius Volz51ef3482008-09-02 15:55:40 +0200307 int (*conn_schedule)(int af, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 struct ip_vs_protocol *pp,
309 int *verdict, struct ip_vs_conn **cpp);
310
311 struct ip_vs_conn *
Julius Volz51ef3482008-09-02 15:55:40 +0200312 (*conn_in_get)(int af,
313 const struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 struct ip_vs_protocol *pp,
Julius Volz51ef3482008-09-02 15:55:40 +0200315 const struct ip_vs_iphdr *iph,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 unsigned int proto_off,
317 int inverse);
318
319 struct ip_vs_conn *
Julius Volz51ef3482008-09-02 15:55:40 +0200320 (*conn_out_get)(int af,
321 const struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 struct ip_vs_protocol *pp,
Julius Volz51ef3482008-09-02 15:55:40 +0200323 const struct ip_vs_iphdr *iph,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 unsigned int proto_off,
325 int inverse);
326
Herbert Xu3db05fe2007-10-15 00:53:15 -0700327 int (*snat_handler)(struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
329
Herbert Xu3db05fe2007-10-15 00:53:15 -0700330 int (*dnat_handler)(struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
332
Julius Volz51ef3482008-09-02 15:55:40 +0200333 int (*csum_check)(int af, struct sk_buff *skb,
334 struct ip_vs_protocol *pp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 const char *(*state_name)(int state);
337
338 int (*state_transition)(struct ip_vs_conn *cp, int direction,
339 const struct sk_buff *skb,
340 struct ip_vs_protocol *pp);
341
342 int (*register_app)(struct ip_vs_app *inc);
343
344 void (*unregister_app)(struct ip_vs_app *inc);
345
346 int (*app_conn_bind)(struct ip_vs_conn *cp);
347
Julian Anastasov0d796412010-10-17 16:46:17 +0300348 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 const struct sk_buff *skb,
350 int offset,
351 const char *msg);
352
353 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
354
355 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
356};
357
358extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
359
Simon Hormanf11017e2010-08-22 21:37:52 +0900360struct ip_vs_conn_param {
361 const union nf_inet_addr *caddr;
362 const union nf_inet_addr *vaddr;
363 __be16 cport;
364 __be16 vport;
365 __u16 protocol;
366 u16 af;
Simon Horman85999282010-08-22 21:37:53 +0900367
368 const struct ip_vs_pe *pe;
369 char *pe_data;
370 __u8 pe_data_len;
Simon Hormanf11017e2010-08-22 21:37:52 +0900371};
372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373/*
374 * IP_VS structure allocated for each dynamically scheduled connection
375 */
376struct ip_vs_conn {
377 struct list_head c_list; /* hashed list heads */
378
379 /* Protocol, addresses and port numbers */
Julius Volze7ade462008-09-02 15:55:33 +0200380 u16 af; /* address family */
381 union nf_inet_addr caddr; /* client address */
382 union nf_inet_addr vaddr; /* virtual address */
383 union nf_inet_addr daddr; /* destination address */
Julian Anastasov35757922010-09-17 14:18:16 +0200384 volatile __u32 flags; /* status flags */
Al Viro014d7302006-09-28 14:29:52 -0700385 __be16 cport;
386 __be16 vport;
387 __be16 dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 __u16 protocol; /* Which protocol (TCP/UDP) */
389
390 /* counter and timer */
391 atomic_t refcnt; /* reference count */
392 struct timer_list timer; /* Expiration timer */
393 volatile unsigned long timeout; /* timeout */
394
395 /* Flags and state transition */
396 spinlock_t lock; /* lock for state transition */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 volatile __u16 state; /* state info */
Rumen G. Bogdanovskiefac5272007-11-07 02:36:55 -0800398 volatile __u16 old_state; /* old state, to be used for
399 * state transition triggerd
400 * synchronization
401 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403 /* Control members */
404 struct ip_vs_conn *control; /* Master control connection */
405 atomic_t n_control; /* Number of controlled ones */
406 struct ip_vs_dest *dest; /* real server */
407 atomic_t in_pkts; /* incoming packet counter */
408
409 /* packet transmitter for different forwarding methods. If it
410 mangles the packet, it must return NF_DROP or better NF_STOLEN,
411 otherwise this must be changed to a sk_buff **.
Julian Anastasovfc604762010-10-17 16:38:15 +0300412 NF_ACCEPT can be returned when destination is local.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 */
414 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
415 struct ip_vs_protocol *pp);
416
417 /* Note: we can group the following members into a structure,
418 in order to save more space, and the following members are
419 only used in VS/NAT anyway */
420 struct ip_vs_app *app; /* bound ip_vs_app object */
421 void *app_data; /* Application private data */
422 struct ip_vs_seq in_seq; /* incoming seq. struct */
423 struct ip_vs_seq out_seq; /* outgoing seq. struct */
Simon Horman85999282010-08-22 21:37:53 +0900424
425 char *pe_data;
426 __u8 pe_data_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427};
428
429
430/*
Julius Volzc860c6b2008-09-02 15:55:36 +0200431 * Extended internal versions of struct ip_vs_service_user and
432 * ip_vs_dest_user for IPv6 support.
433 *
434 * We need these to conveniently pass around service and destination
435 * options, but unfortunately, we also need to keep the old definitions to
436 * maintain userspace backwards compatibility for the setsockopt interface.
437 */
438struct ip_vs_service_user_kern {
439 /* virtual service addresses */
440 u16 af;
441 u16 protocol;
442 union nf_inet_addr addr; /* virtual ip address */
443 u16 port;
444 u32 fwmark; /* firwall mark of service */
445
446 /* virtual service options */
447 char *sched_name;
Simon Horman0d1e71b2010-08-22 21:37:54 +0900448 char *pe_name;
Julius Volzc860c6b2008-09-02 15:55:36 +0200449 unsigned flags; /* virtual service flags */
450 unsigned timeout; /* persistent timeout in sec */
451 u32 netmask; /* persistent netmask */
452};
453
454
455struct ip_vs_dest_user_kern {
456 /* destination server address */
457 union nf_inet_addr addr;
458 u16 port;
459
460 /* real server options */
461 unsigned conn_flags; /* connection flags */
462 int weight; /* destination weight */
463
464 /* thresholds for active connections */
465 u32 u_threshold; /* upper threshold */
466 u32 l_threshold; /* lower threshold */
467};
468
469
470/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 * The information about the virtual service offered to the net
472 * and the forwarding entries
473 */
474struct ip_vs_service {
475 struct list_head s_list; /* for normal service table */
476 struct list_head f_list; /* for fwmark-based service table */
477 atomic_t refcnt; /* reference counter */
478 atomic_t usecnt; /* use counter */
479
Julius Volze7ade462008-09-02 15:55:33 +0200480 u16 af; /* address family */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 __u16 protocol; /* which protocol (TCP/UDP) */
Julius Volze7ade462008-09-02 15:55:33 +0200482 union nf_inet_addr addr; /* IP address for virtual service */
Al Viro014d7302006-09-28 14:29:52 -0700483 __be16 port; /* port number for the service */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 __u32 fwmark; /* firewall mark of the service */
485 unsigned flags; /* service status flags */
486 unsigned timeout; /* persistent timeout in ticks */
Al Viro014d7302006-09-28 14:29:52 -0700487 __be32 netmask; /* grouping granularity */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 struct list_head destinations; /* real server d-linked list */
490 __u32 num_dests; /* number of servers */
491 struct ip_vs_stats stats; /* statistics for the service */
492 struct ip_vs_app *inc; /* bind conns to this app inc */
493
494 /* for scheduling */
495 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
496 rwlock_t sched_lock; /* lock sched_data */
497 void *sched_data; /* scheduler application data */
Simon Horman85999282010-08-22 21:37:53 +0900498
499 /* alternate persistence engine */
500 struct ip_vs_pe *pe;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501};
502
503
504/*
505 * The real server destination forwarding entry
506 * with ip address, port number, and so on.
507 */
508struct ip_vs_dest {
509 struct list_head n_list; /* for the dests in the service */
510 struct list_head d_list; /* for table with all the dests */
511
Julius Volze7ade462008-09-02 15:55:33 +0200512 u16 af; /* address family */
513 union nf_inet_addr addr; /* IP address of the server */
Al Viro014d7302006-09-28 14:29:52 -0700514 __be16 port; /* port number of the server */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 volatile unsigned flags; /* dest status flags */
516 atomic_t conn_flags; /* flags to copy to conn */
517 atomic_t weight; /* server weight */
518
519 atomic_t refcnt; /* reference counter */
520 struct ip_vs_stats stats; /* statistics */
521
522 /* connection counters and thresholds */
523 atomic_t activeconns; /* active connections */
524 atomic_t inactconns; /* inactive connections */
525 atomic_t persistconns; /* persistent connections */
526 __u32 u_threshold; /* upper threshold */
527 __u32 l_threshold; /* lower threshold */
528
529 /* for destination cache */
530 spinlock_t dst_lock; /* lock of dst_cache */
531 struct dst_entry *dst_cache; /* destination cache entry */
532 u32 dst_rtos; /* RT_TOS(tos) for dst */
Hans Schillstrom714f0952010-10-19 10:38:48 +0200533 u32 dst_cookie;
534#ifdef CONFIG_IP_VS_IPV6
535 struct in6_addr dst_saddr;
536#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
538 /* for virtual service */
539 struct ip_vs_service *svc; /* service it belongs to */
540 __u16 protocol; /* which protocol (TCP/UDP) */
Julius Volze7ade462008-09-02 15:55:33 +0200541 union nf_inet_addr vaddr; /* virtual IP address */
Al Viro014d7302006-09-28 14:29:52 -0700542 __be16 vport; /* virtual port number */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 __u32 vfwmark; /* firewall mark of service */
544};
545
546
547/*
548 * The scheduler object
549 */
550struct ip_vs_scheduler {
551 struct list_head n_list; /* d-linked list head */
552 char *name; /* scheduler name */
553 atomic_t refcnt; /* reference counter */
554 struct module *module; /* THIS_MODULE/NULL */
555
556 /* scheduler initializing service */
557 int (*init_service)(struct ip_vs_service *svc);
558 /* scheduling service finish */
559 int (*done_service)(struct ip_vs_service *svc);
560 /* scheduler updating service */
561 int (*update_service)(struct ip_vs_service *svc);
562
563 /* selecting a server from the given service */
564 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
565 const struct sk_buff *skb);
566};
567
Simon Horman85999282010-08-22 21:37:53 +0900568/* The persistence engine object */
569struct ip_vs_pe {
570 struct list_head n_list; /* d-linked list head */
571 char *name; /* scheduler name */
572 atomic_t refcnt; /* reference counter */
573 struct module *module; /* THIS_MODULE/NULL */
574
575 /* get the connection template, if any */
576 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
577 bool (*ct_match)(const struct ip_vs_conn_param *p,
578 struct ip_vs_conn *ct);
579 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
580 bool inverse);
Simon Hormana3c918a2010-08-22 21:37:53 +0900581 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
Simon Horman85999282010-08-22 21:37:53 +0900582};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584/*
585 * The application module object (a.k.a. app incarnation)
586 */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000587struct ip_vs_app {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 struct list_head a_list; /* member in app list */
589 int type; /* IP_VS_APP_TYPE_xxx */
590 char *name; /* application module name */
591 __u16 protocol;
592 struct module *module; /* THIS_MODULE/NULL */
593 struct list_head incs_list; /* list of incarnations */
594
595 /* members for application incarnations */
596 struct list_head p_list; /* member in proto app list */
597 struct ip_vs_app *app; /* its real application */
Al Viro014d7302006-09-28 14:29:52 -0700598 __be16 port; /* port number in net order */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 atomic_t usecnt; /* usage counter */
600
Julian Anastasov8b27b102010-10-17 16:17:20 +0300601 /*
602 * output hook: Process packet in inout direction, diff set for TCP.
603 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
604 * 2=Mangled but checksum was not updated
605 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
Herbert Xu3db05fe2007-10-15 00:53:15 -0700607 struct sk_buff *, int *diff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Julian Anastasov8b27b102010-10-17 16:17:20 +0300609 /*
610 * input hook: Process packet in outin direction, diff set for TCP.
611 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
612 * 2=Mangled but checksum was not updated
613 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
Herbert Xu3db05fe2007-10-15 00:53:15 -0700615 struct sk_buff *, int *diff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
617 /* ip_vs_app initializer */
618 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
619
620 /* ip_vs_app finish */
621 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
622
623
624 /* not used now */
625 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
626 struct ip_vs_protocol *);
627
628 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
629
630 int * timeout_table;
631 int * timeouts;
632 int timeouts_size;
633
634 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
635 int *verdict, struct ip_vs_conn **cpp);
636
637 struct ip_vs_conn *
638 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
639 const struct iphdr *iph, unsigned int proto_off,
640 int inverse);
641
642 struct ip_vs_conn *
643 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
644 const struct iphdr *iph, unsigned int proto_off,
645 int inverse);
646
647 int (*state_transition)(struct ip_vs_conn *cp, int direction,
648 const struct sk_buff *skb,
649 struct ip_vs_app *app);
650
651 void (*timeout_change)(struct ip_vs_app *app, int flags);
652};
653
654
655/*
656 * IPVS core functions
657 * (from ip_vs_core.c)
658 */
659extern const char *ip_vs_proto_name(unsigned proto);
660extern void ip_vs_init_hash_table(struct list_head *table, int rows);
Sven Wegenerafdd6142008-08-10 09:18:01 +0000661#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663#define IP_VS_APP_TYPE_FTP 1
664
665/*
666 * ip_vs_conn handling functions
667 * (from ip_vs_conn.c)
668 */
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670enum {
671 IP_VS_DIR_INPUT = 0,
672 IP_VS_DIR_OUTPUT,
673 IP_VS_DIR_INPUT_ONLY,
674 IP_VS_DIR_LAST,
675};
676
Simon Hormanf11017e2010-08-22 21:37:52 +0900677static inline void ip_vs_conn_fill_param(int af, int protocol,
678 const union nf_inet_addr *caddr,
679 __be16 cport,
680 const union nf_inet_addr *vaddr,
681 __be16 vport,
682 struct ip_vs_conn_param *p)
683{
684 p->af = af;
685 p->protocol = protocol;
686 p->caddr = caddr;
687 p->cport = cport;
688 p->vaddr = vaddr;
689 p->vport = vport;
Simon Horman85999282010-08-22 21:37:53 +0900690 p->pe = NULL;
691 p->pe_data = NULL;
Simon Hormanf11017e2010-08-22 21:37:52 +0900692}
Julius Volz28364a52008-09-02 15:55:43 +0200693
Simon Hormanf11017e2010-08-22 21:37:52 +0900694struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
695struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
Julius Volz28364a52008-09-02 15:55:43 +0200696
Simon Horman5c0d2372010-08-02 17:12:44 +0200697struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
698 struct ip_vs_protocol *pp,
699 const struct ip_vs_iphdr *iph,
700 unsigned int proto_off,
701 int inverse);
702
Simon Hormanf11017e2010-08-22 21:37:52 +0900703struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Simon Horman5c0d2372010-08-02 17:12:44 +0200705struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
706 struct ip_vs_protocol *pp,
707 const struct ip_vs_iphdr *iph,
708 unsigned int proto_off,
709 int inverse);
710
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711/* put back the conn without restarting its timer */
712static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
713{
714 atomic_dec(&cp->refcnt);
715}
716extern void ip_vs_conn_put(struct ip_vs_conn *cp);
Al Viro014d7302006-09-28 14:29:52 -0700717extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
Simon Hormanf11017e2010-08-22 21:37:52 +0900719struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
720 const union nf_inet_addr *daddr,
721 __be16 dport, unsigned flags,
722 struct ip_vs_dest *dest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
724
725extern const char * ip_vs_state_name(__u16 proto, int state);
726
727extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
728extern int ip_vs_check_template(struct ip_vs_conn *ct);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729extern void ip_vs_random_dropentry(void);
730extern int ip_vs_conn_init(void);
731extern void ip_vs_conn_cleanup(void);
732
733static inline void ip_vs_control_del(struct ip_vs_conn *cp)
734{
735 struct ip_vs_conn *ctl_cp = cp->control;
736 if (!ctl_cp) {
Julius Volzcfc78c52008-09-02 15:55:53 +0200737 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
738 "%s:%d to %s:%d\n",
739 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
740 ntohs(cp->cport),
741 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
742 ntohs(cp->vport));
743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 return;
745 }
746
Julius Volzcfc78c52008-09-02 15:55:53 +0200747 IP_VS_DBG_BUF(7, "DELeting control for: "
748 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
749 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
750 ntohs(cp->cport),
751 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
752 ntohs(ctl_cp->cport));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
754 cp->control = NULL;
755 if (atomic_read(&ctl_cp->n_control) == 0) {
Julius Volzcfc78c52008-09-02 15:55:53 +0200756 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
757 "%s:%d to %s:%d\n",
758 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
759 ntohs(cp->cport),
760 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
761 ntohs(cp->vport));
762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 return;
764 }
765 atomic_dec(&ctl_cp->n_control);
766}
767
768static inline void
769ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
770{
771 if (cp->control) {
Julius Volzcfc78c52008-09-02 15:55:53 +0200772 IP_VS_ERR_BUF("request control ADD for already controlled: "
773 "%s:%d to %s:%d\n",
774 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
775 ntohs(cp->cport),
776 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
777 ntohs(cp->vport));
778
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 ip_vs_control_del(cp);
780 }
781
Julius Volzcfc78c52008-09-02 15:55:53 +0200782 IP_VS_DBG_BUF(7, "ADDing control for: "
783 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
784 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
785 ntohs(cp->cport),
786 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
787 ntohs(ctl_cp->cport));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
789 cp->control = ctl_cp;
790 atomic_inc(&ctl_cp->n_control);
791}
792
793
794/*
795 * IPVS application functions
796 * (from ip_vs_app.c)
797 */
798#define IP_VS_APP_MAX_PORTS 8
799extern int register_ip_vs_app(struct ip_vs_app *app);
800extern void unregister_ip_vs_app(struct ip_vs_app *app);
801extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
802extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
803extern int
804register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
805extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
806extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
807
Herbert Xu3db05fe2007-10-15 00:53:15 -0700808extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
809extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810extern int ip_vs_app_init(void);
811extern void ip_vs_app_cleanup(void);
812
Simon Horman8be67a62010-08-22 21:37:54 +0900813void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
814void ip_vs_unbind_pe(struct ip_vs_service *svc);
815int register_ip_vs_pe(struct ip_vs_pe *pe);
816int unregister_ip_vs_pe(struct ip_vs_pe *pe);
817extern struct ip_vs_pe *ip_vs_pe_get(const char *name);
818extern void ip_vs_pe_put(struct ip_vs_pe *pe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820/*
821 * IPVS protocol functions (from ip_vs_proto.c)
822 */
823extern int ip_vs_protocol_init(void);
824extern void ip_vs_protocol_cleanup(void);
825extern void ip_vs_protocol_timeout_change(int flags);
826extern int *ip_vs_create_timeout_table(int *table, int size);
827extern int
Jan Engelhardt36cbd3d2009-08-05 10:42:58 -0700828ip_vs_set_state_timeout(int *table, int num, const char *const *names,
829 const char *name, int to);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830extern void
Julian Anastasov0d796412010-10-17 16:46:17 +0300831ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
832 const struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 int offset, const char *msg);
834
835extern struct ip_vs_protocol ip_vs_protocol_tcp;
836extern struct ip_vs_protocol ip_vs_protocol_udp;
837extern struct ip_vs_protocol ip_vs_protocol_icmp;
838extern struct ip_vs_protocol ip_vs_protocol_esp;
839extern struct ip_vs_protocol ip_vs_protocol_ah;
Venkata Mohan Reddy2906f662010-02-18 12:31:05 +0100840extern struct ip_vs_protocol ip_vs_protocol_sctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
842/*
843 * Registering/unregistering scheduler functions
844 * (from ip_vs_sched.c)
845 */
846extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
847extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
848extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
849 struct ip_vs_scheduler *scheduler);
850extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
851extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
852extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
853extern struct ip_vs_conn *
Julian Anastasov190ecd22010-10-17 16:24:37 +0300854ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
855 struct ip_vs_protocol *pp, int *ignored);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
857 struct ip_vs_protocol *pp);
858
859
860/*
861 * IPVS control data and functions (from ip_vs_ctl.c)
862 */
863extern int sysctl_ip_vs_cache_bypass;
864extern int sysctl_ip_vs_expire_nodest_conn;
865extern int sysctl_ip_vs_expire_quiescent_template;
866extern int sysctl_ip_vs_sync_threshold[2];
867extern int sysctl_ip_vs_nat_icmp_send;
Julian Anastasovf4bc17c2010-09-21 17:35:41 +0200868extern int sysctl_ip_vs_conntrack;
Julian Anastasov8a803042010-09-21 17:38:57 +0200869extern int sysctl_ip_vs_snat_reroute;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870extern struct ip_vs_stats ip_vs_stats;
Sven Wegener5587da52008-08-10 18:24:40 +0000871extern const struct ctl_path net_vs_ctl_path[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
873extern struct ip_vs_service *
Julius Volz3c2e0502008-09-02 15:55:38 +0200874ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
875 const union nf_inet_addr *vaddr, __be16 vport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876
877static inline void ip_vs_service_put(struct ip_vs_service *svc)
878{
879 atomic_dec(&svc->usecnt);
880}
881
882extern struct ip_vs_dest *
Julius Volz7937df12008-09-02 15:55:48 +0200883ip_vs_lookup_real_service(int af, __u16 protocol,
884 const union nf_inet_addr *daddr, __be16 dport);
885
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886extern int ip_vs_use_count_inc(void);
887extern void ip_vs_use_count_dec(void);
888extern int ip_vs_control_init(void);
889extern void ip_vs_control_cleanup(void);
Rumen G. Bogdanovski1e356f92007-11-07 02:35:54 -0800890extern struct ip_vs_dest *
Julius Volz7937df12008-09-02 15:55:48 +0200891ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
892 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
Rumen G. Bogdanovski1e356f92007-11-07 02:35:54 -0800893extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
895
896/*
897 * IPVS sync daemon data and function prototypes
898 * (from ip_vs_sync.c)
899 */
900extern volatile int ip_vs_sync_state;
901extern volatile int ip_vs_master_syncid;
902extern volatile int ip_vs_backup_syncid;
903extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
904extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
905extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
906extern int stop_sync_thread(int state);
907extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
908
909
910/*
911 * IPVS rate estimator prototypes (from ip_vs_est.c)
912 */
Sven Wegenera919cf42008-08-14 00:47:16 +0200913extern int ip_vs_estimator_init(void);
914extern void ip_vs_estimator_cleanup(void);
Sven Wegener3a14a3132008-08-10 18:24:41 +0000915extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
917extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
918
919/*
920 * Various IPVS packet transmitters (from ip_vs_xmit.c)
921 */
922extern int ip_vs_null_xmit
923(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
924extern int ip_vs_bypass_xmit
925(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
926extern int ip_vs_nat_xmit
927(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
928extern int ip_vs_tunnel_xmit
929(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
930extern int ip_vs_dr_xmit
931(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
932extern int ip_vs_icmp_xmit
933(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
934extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
935
Julius Volzb3cdd2a72008-09-02 15:55:45 +0200936#ifdef CONFIG_IP_VS_IPV6
937extern int ip_vs_bypass_xmit_v6
938(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
939extern int ip_vs_nat_xmit_v6
940(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
941extern int ip_vs_tunnel_xmit_v6
942(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
943extern int ip_vs_dr_xmit_v6
944(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
945extern int ip_vs_icmp_xmit_v6
946(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
947 int offset);
948#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950/*
951 * This is a simple mechanism to ignore packets when
952 * we are loaded. Just set ip_vs_drop_rate to 'n' and
953 * we start to drop 1/rate of the packets
954 */
955extern int ip_vs_drop_rate;
956extern int ip_vs_drop_counter;
957
958static __inline__ int ip_vs_todrop(void)
959{
960 if (!ip_vs_drop_rate) return 0;
961 if (--ip_vs_drop_counter > 0) return 0;
962 ip_vs_drop_counter = ip_vs_drop_rate;
963 return 1;
964}
965
966/*
967 * ip_vs_fwd_tag returns the forwarding tag of the connection
968 */
969#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
970
Adrian Bunk732db652005-09-01 17:40:26 -0700971static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972{
973 char fwd;
974
975 switch (IP_VS_FWD_METHOD(cp)) {
976 case IP_VS_CONN_F_MASQ:
977 fwd = 'M'; break;
978 case IP_VS_CONN_F_LOCALNODE:
979 fwd = 'L'; break;
980 case IP_VS_CONN_F_TUNNEL:
981 fwd = 'T'; break;
982 case IP_VS_CONN_F_DROUTE:
983 fwd = 'R'; break;
984 case IP_VS_CONN_F_BYPASS:
985 fwd = 'B'; break;
986 default:
987 fwd = '?'; break;
988 }
989 return fwd;
990}
991
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
Julius Volzb3cdd2a72008-09-02 15:55:45 +0200993 struct ip_vs_conn *cp, int dir);
994
995#ifdef CONFIG_IP_VS_IPV6
996extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
997 struct ip_vs_conn *cp, int dir);
998#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
Al Virob1550f22006-11-14 21:37:50 -08001000extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
Al Virof9214b22006-11-16 02:41:18 -08001002static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
Al Virof9214b22006-11-16 02:41:18 -08001004 __be32 diff[2] = { ~old, new };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
Joe Perches07f07572008-11-19 15:44:53 -08001006 return csum_partial(diff, sizeof(diff), oldsum);
Al Virof9214b22006-11-16 02:41:18 -08001007}
1008
Julius Volz0bbdd422008-09-02 15:55:42 +02001009#ifdef CONFIG_IP_VS_IPV6
1010static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1011 __wsum oldsum)
1012{
1013 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1014 new[3], new[2], new[1], new[0] };
1015
Joe Perches07f07572008-11-19 15:44:53 -08001016 return csum_partial(diff, sizeof(diff), oldsum);
Julius Volz0bbdd422008-09-02 15:55:42 +02001017}
1018#endif
1019
Al Virof9214b22006-11-16 02:41:18 -08001020static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1021{
1022 __be16 diff[2] = { ~old, new };
1023
Joe Perches07f07572008-11-19 15:44:53 -08001024 return csum_partial(diff, sizeof(diff), oldsum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025}
1026
Julian Anastasovcf356d62010-10-17 16:21:07 +03001027/*
1028 * Forget current conntrack (unconfirmed) and attach notrack entry
1029 */
1030static inline void ip_vs_notrack(struct sk_buff *skb)
1031{
1032#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1033 enum ip_conntrack_info ctinfo;
1034 struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
1035
1036 if (!ct || !nf_ct_is_untracked(ct)) {
1037 nf_reset(skb);
1038 skb->nfct = &nf_ct_untracked_get()->ct_general;
1039 skb->nfctinfo = IP_CT_NEW;
1040 nf_conntrack_get(skb->nfct);
1041 }
1042#endif
1043}
1044
Julian Anastasovf4bc17c2010-09-21 17:35:41 +02001045#ifdef CONFIG_IP_VS_NFCT
1046/*
1047 * Netfilter connection tracking
1048 * (from ip_vs_nfct.c)
1049 */
1050static inline int ip_vs_conntrack_enabled(void)
1051{
1052 return sysctl_ip_vs_conntrack;
1053}
1054
Julian Anastasov6523ce12010-09-05 18:02:29 +00001055extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1056 int outin);
Julian Anastasovf4bc17c2010-09-21 17:35:41 +02001057extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1058extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1059 struct ip_vs_conn *cp, u_int8_t proto,
1060 const __be16 port, int from_rs);
1061extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1062
1063#else
1064
1065static inline int ip_vs_conntrack_enabled(void)
1066{
1067 return 0;
1068}
1069
1070static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1071 struct ip_vs_conn *cp, int outin)
1072{
1073}
1074
1075static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1076 struct ip_vs_conn *cp)
1077{
1078 return NF_ACCEPT;
1079}
1080
1081static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1082{
1083}
1084/* CONFIG_IP_VS_NFCT */
1085#endif
Julian Anastasov6523ce12010-09-05 18:02:29 +00001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087#endif /* __KERNEL__ */
1088
Julius Volzbc4768e2008-07-31 20:45:24 -07001089#endif /* _NET_IP_VS_H */