IPVS: use pr_err and friends instead of IP_VS_ERR and friends
[linux-2.6.git] / include / net / ip_vs.h
1 /*
2  *      IP Virtual Server
3  *      data structure and functionality definitions
4  */
5
6 #ifndef _NET_IP_VS_H
7 #define _NET_IP_VS_H
8
9 #include <linux/ip_vs.h>                /* definitions shared with userland */
10
11 /* old ipvsadm versions still include this file directly */
12 #ifdef __KERNEL__
13
14 #include <asm/types.h>                  /* for __uXX types */
15
16 #include <linux/sysctl.h>               /* for ctl_path */
17 #include <linux/list.h>                 /* for struct list_head */
18 #include <linux/spinlock.h>             /* for struct rwlock_t */
19 #include <asm/atomic.h>                 /* for struct atomic_t */
20 #include <linux/compiler.h>
21 #include <linux/timer.h>
22
23 #include <net/checksum.h>
24 #include <linux/netfilter.h>            /* for union nf_inet_addr */
25 #include <linux/ip.h>
26 #include <linux/ipv6.h>                 /* for struct ipv6hdr */
27 #include <net/ipv6.h>                   /* for ipv6_addr_copy */
28
29 struct ip_vs_iphdr {
30         int len;
31         __u8 protocol;
32         union nf_inet_addr saddr;
33         union nf_inet_addr daddr;
34 };
35
36 static inline void
37 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
38 {
39 #ifdef CONFIG_IP_VS_IPV6
40         if (af == AF_INET6) {
41                 const struct ipv6hdr *iph = nh;
42                 iphdr->len = sizeof(struct ipv6hdr);
43                 iphdr->protocol = iph->nexthdr;
44                 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
45                 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
46         } else
47 #endif
48         {
49                 const struct iphdr *iph = nh;
50                 iphdr->len = iph->ihl * 4;
51                 iphdr->protocol = iph->protocol;
52                 iphdr->saddr.ip = iph->saddr;
53                 iphdr->daddr.ip = iph->daddr;
54         }
55 }
56
57 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
58                                    const union nf_inet_addr *src)
59 {
60 #ifdef CONFIG_IP_VS_IPV6
61         if (af == AF_INET6)
62                 ipv6_addr_copy(&dst->in6, &src->in6);
63         else
64 #endif
65         dst->ip = src->ip;
66 }
67
68 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
69                                    const union nf_inet_addr *b)
70 {
71 #ifdef CONFIG_IP_VS_IPV6
72         if (af == AF_INET6)
73                 return ipv6_addr_equal(&a->in6, &b->in6);
74 #endif
75         return a->ip == b->ip;
76 }
77
78 #ifdef CONFIG_IP_VS_DEBUG
79 #include <linux/net.h>
80
81 extern int ip_vs_get_debug_level(void);
82
83 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
84                                          const union nf_inet_addr *addr,
85                                          int *idx)
86 {
87         int len;
88 #ifdef CONFIG_IP_VS_IPV6
89         if (af == AF_INET6)
90                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
91                                &addr->in6) + 1;
92         else
93 #endif
94                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
95                                &addr->ip) + 1;
96
97         *idx += len;
98         BUG_ON(*idx > buf_len + 1);
99         return &buf[*idx - len];
100 }
101
102 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
103         do {                                                            \
104                 char ip_vs_dbg_buf[160];                                \
105                 int ip_vs_dbg_idx = 0;                                  \
106                 if (level <= ip_vs_get_debug_level())                   \
107                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
108         } while (0)
109 #define IP_VS_ERR_BUF(msg...)                                           \
110         do {                                                            \
111                 char ip_vs_dbg_buf[160];                                \
112                 int ip_vs_dbg_idx = 0;                                  \
113                 pr_err(msg);                                            \
114         } while (0)
115
116 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
117 #define IP_VS_DBG_ADDR(af, addr)                                        \
118         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
119                        sizeof(ip_vs_dbg_buf), addr,                     \
120                        &ip_vs_dbg_idx)
121
122 #define IP_VS_DBG(level, msg, ...)                                      \
123         do {                                                            \
124                 if (level <= ip_vs_get_debug_level())                   \
125                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
126         } while (0)
127 #define IP_VS_DBG_RL(msg, ...)                                          \
128         do {                                                            \
129                 if (net_ratelimit())                                    \
130                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
131         } while (0)
132 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)                         \
133         do {                                                            \
134                 if (level <= ip_vs_get_debug_level())                   \
135                         pp->debug_packet(pp, skb, ofs, msg);            \
136         } while (0)
137 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)                      \
138         do {                                                            \
139                 if (level <= ip_vs_get_debug_level() &&                 \
140                     net_ratelimit())                                    \
141                         pp->debug_packet(pp, skb, ofs, msg);            \
142         } while (0)
143 #else   /* NO DEBUGGING at ALL */
144 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
145 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
146 #define IP_VS_DBG(level, msg...)  do {} while (0)
147 #define IP_VS_DBG_RL(msg...)  do {} while (0)
148 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)         do {} while (0)
149 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)      do {} while (0)
150 #endif
151
152 #define IP_VS_BUG() BUG()
153 #define IP_VS_ERR_RL(msg, ...)                                          \
154         do {                                                            \
155                 if (net_ratelimit())                                    \
156                         pr_err(msg, ##__VA_ARGS__);                     \
157         } while (0)
158
159 #ifdef CONFIG_IP_VS_DEBUG
160 #define EnterFunction(level)                                            \
161         do {                                                            \
162                 if (level <= ip_vs_get_debug_level())                   \
163                         printk(KERN_DEBUG                               \
164                                pr_fmt("Enter: %s, %s line %i\n"),       \
165                                __func__, __FILE__, __LINE__);           \
166         } while (0)
167 #define LeaveFunction(level)                                            \
168         do {                                                            \
169                 if (level <= ip_vs_get_debug_level())                   \
170                         printk(KERN_DEBUG                               \
171                                pr_fmt("Leave: %s, %s line %i\n"),       \
172                                __func__, __FILE__, __LINE__);           \
173         } while (0)
174 #else
175 #define EnterFunction(level)   do {} while (0)
176 #define LeaveFunction(level)   do {} while (0)
177 #endif
178
179 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
180
181
182 /*
183  *      The port number of FTP service (in network order).
184  */
185 #define FTPPORT  cpu_to_be16(21)
186 #define FTPDATA  cpu_to_be16(20)
187
188 /*
189  *      TCP State Values
190  */
191 enum {
192         IP_VS_TCP_S_NONE = 0,
193         IP_VS_TCP_S_ESTABLISHED,
194         IP_VS_TCP_S_SYN_SENT,
195         IP_VS_TCP_S_SYN_RECV,
196         IP_VS_TCP_S_FIN_WAIT,
197         IP_VS_TCP_S_TIME_WAIT,
198         IP_VS_TCP_S_CLOSE,
199         IP_VS_TCP_S_CLOSE_WAIT,
200         IP_VS_TCP_S_LAST_ACK,
201         IP_VS_TCP_S_LISTEN,
202         IP_VS_TCP_S_SYNACK,
203         IP_VS_TCP_S_LAST
204 };
205
206 /*
207  *      UDP State Values
208  */
209 enum {
210         IP_VS_UDP_S_NORMAL,
211         IP_VS_UDP_S_LAST,
212 };
213
214 /*
215  *      ICMP State Values
216  */
217 enum {
218         IP_VS_ICMP_S_NORMAL,
219         IP_VS_ICMP_S_LAST,
220 };
221
222 /*
223  *      Delta sequence info structure
224  *      Each ip_vs_conn has 2 (output AND input seq. changes).
225  *      Only used in the VS/NAT.
226  */
227 struct ip_vs_seq {
228         __u32                   init_seq;       /* Add delta from this seq */
229         __u32                   delta;          /* Delta in sequence numbers */
230         __u32                   previous_delta; /* Delta in sequence numbers
231                                                    before last resized pkt */
232 };
233
234
235 /*
236  *      IPVS statistics objects
237  */
238 struct ip_vs_estimator {
239         struct list_head        list;
240
241         u64                     last_inbytes;
242         u64                     last_outbytes;
243         u32                     last_conns;
244         u32                     last_inpkts;
245         u32                     last_outpkts;
246
247         u32                     cps;
248         u32                     inpps;
249         u32                     outpps;
250         u32                     inbps;
251         u32                     outbps;
252 };
253
254 struct ip_vs_stats
255 {
256         struct ip_vs_stats_user ustats;         /* statistics */
257         struct ip_vs_estimator  est;            /* estimator */
258
259         spinlock_t              lock;           /* spin lock */
260 };
261
262 struct dst_entry;
263 struct iphdr;
264 struct ip_vs_conn;
265 struct ip_vs_app;
266 struct sk_buff;
267
268 struct ip_vs_protocol {
269         struct ip_vs_protocol   *next;
270         char                    *name;
271         u16                     protocol;
272         u16                     num_states;
273         int                     dont_defrag;
274         atomic_t                appcnt;         /* counter of proto app incs */
275         int                     *timeout_table; /* protocol timeout table */
276
277         void (*init)(struct ip_vs_protocol *pp);
278
279         void (*exit)(struct ip_vs_protocol *pp);
280
281         int (*conn_schedule)(int af, struct sk_buff *skb,
282                              struct ip_vs_protocol *pp,
283                              int *verdict, struct ip_vs_conn **cpp);
284
285         struct ip_vs_conn *
286         (*conn_in_get)(int af,
287                        const struct sk_buff *skb,
288                        struct ip_vs_protocol *pp,
289                        const struct ip_vs_iphdr *iph,
290                        unsigned int proto_off,
291                        int inverse);
292
293         struct ip_vs_conn *
294         (*conn_out_get)(int af,
295                         const struct sk_buff *skb,
296                         struct ip_vs_protocol *pp,
297                         const struct ip_vs_iphdr *iph,
298                         unsigned int proto_off,
299                         int inverse);
300
301         int (*snat_handler)(struct sk_buff *skb,
302                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
303
304         int (*dnat_handler)(struct sk_buff *skb,
305                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
306
307         int (*csum_check)(int af, struct sk_buff *skb,
308                           struct ip_vs_protocol *pp);
309
310         const char *(*state_name)(int state);
311
312         int (*state_transition)(struct ip_vs_conn *cp, int direction,
313                                 const struct sk_buff *skb,
314                                 struct ip_vs_protocol *pp);
315
316         int (*register_app)(struct ip_vs_app *inc);
317
318         void (*unregister_app)(struct ip_vs_app *inc);
319
320         int (*app_conn_bind)(struct ip_vs_conn *cp);
321
322         void (*debug_packet)(struct ip_vs_protocol *pp,
323                              const struct sk_buff *skb,
324                              int offset,
325                              const char *msg);
326
327         void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
328
329         int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
330 };
331
332 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
333
334 /*
335  *      IP_VS structure allocated for each dynamically scheduled connection
336  */
337 struct ip_vs_conn {
338         struct list_head        c_list;         /* hashed list heads */
339
340         /* Protocol, addresses and port numbers */
341         u16                      af;            /* address family */
342         union nf_inet_addr       caddr;          /* client address */
343         union nf_inet_addr       vaddr;          /* virtual address */
344         union nf_inet_addr       daddr;          /* destination address */
345         __be16                   cport;
346         __be16                   vport;
347         __be16                   dport;
348         __u16                   protocol;       /* Which protocol (TCP/UDP) */
349
350         /* counter and timer */
351         atomic_t                refcnt;         /* reference count */
352         struct timer_list       timer;          /* Expiration timer */
353         volatile unsigned long  timeout;        /* timeout */
354
355         /* Flags and state transition */
356         spinlock_t              lock;           /* lock for state transition */
357         volatile __u16          flags;          /* status flags */
358         volatile __u16          state;          /* state info */
359         volatile __u16          old_state;      /* old state, to be used for
360                                                  * state transition triggerd
361                                                  * synchronization
362                                                  */
363
364         /* Control members */
365         struct ip_vs_conn       *control;       /* Master control connection */
366         atomic_t                n_control;      /* Number of controlled ones */
367         struct ip_vs_dest       *dest;          /* real server */
368         atomic_t                in_pkts;        /* incoming packet counter */
369
370         /* packet transmitter for different forwarding methods.  If it
371            mangles the packet, it must return NF_DROP or better NF_STOLEN,
372            otherwise this must be changed to a sk_buff **.
373          */
374         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
375                            struct ip_vs_protocol *pp);
376
377         /* Note: we can group the following members into a structure,
378            in order to save more space, and the following members are
379            only used in VS/NAT anyway */
380         struct ip_vs_app        *app;           /* bound ip_vs_app object */
381         void                    *app_data;      /* Application private data */
382         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
383         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
384 };
385
386
387 /*
388  *      Extended internal versions of struct ip_vs_service_user and
389  *      ip_vs_dest_user for IPv6 support.
390  *
391  *      We need these to conveniently pass around service and destination
392  *      options, but unfortunately, we also need to keep the old definitions to
393  *      maintain userspace backwards compatibility for the setsockopt interface.
394  */
395 struct ip_vs_service_user_kern {
396         /* virtual service addresses */
397         u16                     af;
398         u16                     protocol;
399         union nf_inet_addr      addr;           /* virtual ip address */
400         u16                     port;
401         u32                     fwmark;         /* firwall mark of service */
402
403         /* virtual service options */
404         char                    *sched_name;
405         unsigned                flags;          /* virtual service flags */
406         unsigned                timeout;        /* persistent timeout in sec */
407         u32                     netmask;        /* persistent netmask */
408 };
409
410
411 struct ip_vs_dest_user_kern {
412         /* destination server address */
413         union nf_inet_addr      addr;
414         u16                     port;
415
416         /* real server options */
417         unsigned                conn_flags;     /* connection flags */
418         int                     weight;         /* destination weight */
419
420         /* thresholds for active connections */
421         u32                     u_threshold;    /* upper threshold */
422         u32                     l_threshold;    /* lower threshold */
423 };
424
425
426 /*
427  *      The information about the virtual service offered to the net
428  *      and the forwarding entries
429  */
430 struct ip_vs_service {
431         struct list_head        s_list;   /* for normal service table */
432         struct list_head        f_list;   /* for fwmark-based service table */
433         atomic_t                refcnt;   /* reference counter */
434         atomic_t                usecnt;   /* use counter */
435
436         u16                     af;       /* address family */
437         __u16                   protocol; /* which protocol (TCP/UDP) */
438         union nf_inet_addr      addr;     /* IP address for virtual service */
439         __be16                  port;     /* port number for the service */
440         __u32                   fwmark;   /* firewall mark of the service */
441         unsigned                flags;    /* service status flags */
442         unsigned                timeout;  /* persistent timeout in ticks */
443         __be32                  netmask;  /* grouping granularity */
444
445         struct list_head        destinations;  /* real server d-linked list */
446         __u32                   num_dests;     /* number of servers */
447         struct ip_vs_stats      stats;         /* statistics for the service */
448         struct ip_vs_app        *inc;     /* bind conns to this app inc */
449
450         /* for scheduling */
451         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
452         rwlock_t                sched_lock;    /* lock sched_data */
453         void                    *sched_data;   /* scheduler application data */
454 };
455
456
457 /*
458  *      The real server destination forwarding entry
459  *      with ip address, port number, and so on.
460  */
461 struct ip_vs_dest {
462         struct list_head        n_list;   /* for the dests in the service */
463         struct list_head        d_list;   /* for table with all the dests */
464
465         u16                     af;             /* address family */
466         union nf_inet_addr      addr;           /* IP address of the server */
467         __be16                  port;           /* port number of the server */
468         volatile unsigned       flags;          /* dest status flags */
469         atomic_t                conn_flags;     /* flags to copy to conn */
470         atomic_t                weight;         /* server weight */
471
472         atomic_t                refcnt;         /* reference counter */
473         struct ip_vs_stats      stats;          /* statistics */
474
475         /* connection counters and thresholds */
476         atomic_t                activeconns;    /* active connections */
477         atomic_t                inactconns;     /* inactive connections */
478         atomic_t                persistconns;   /* persistent connections */
479         __u32                   u_threshold;    /* upper threshold */
480         __u32                   l_threshold;    /* lower threshold */
481
482         /* for destination cache */
483         spinlock_t              dst_lock;       /* lock of dst_cache */
484         struct dst_entry        *dst_cache;     /* destination cache entry */
485         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
486
487         /* for virtual service */
488         struct ip_vs_service    *svc;           /* service it belongs to */
489         __u16                   protocol;       /* which protocol (TCP/UDP) */
490         union nf_inet_addr      vaddr;          /* virtual IP address */
491         __be16                  vport;          /* virtual port number */
492         __u32                   vfwmark;        /* firewall mark of service */
493 };
494
495
496 /*
497  *      The scheduler object
498  */
499 struct ip_vs_scheduler {
500         struct list_head        n_list;         /* d-linked list head */
501         char                    *name;          /* scheduler name */
502         atomic_t                refcnt;         /* reference counter */
503         struct module           *module;        /* THIS_MODULE/NULL */
504
505         /* scheduler initializing service */
506         int (*init_service)(struct ip_vs_service *svc);
507         /* scheduling service finish */
508         int (*done_service)(struct ip_vs_service *svc);
509         /* scheduler updating service */
510         int (*update_service)(struct ip_vs_service *svc);
511
512         /* selecting a server from the given service */
513         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
514                                        const struct sk_buff *skb);
515 };
516
517
518 /*
519  *      The application module object (a.k.a. app incarnation)
520  */
521 struct ip_vs_app
522 {
523         struct list_head        a_list;         /* member in app list */
524         int                     type;           /* IP_VS_APP_TYPE_xxx */
525         char                    *name;          /* application module name */
526         __u16                   protocol;
527         struct module           *module;        /* THIS_MODULE/NULL */
528         struct list_head        incs_list;      /* list of incarnations */
529
530         /* members for application incarnations */
531         struct list_head        p_list;         /* member in proto app list */
532         struct ip_vs_app        *app;           /* its real application */
533         __be16                  port;           /* port number in net order */
534         atomic_t                usecnt;         /* usage counter */
535
536         /* output hook: return false if can't linearize. diff set for TCP.  */
537         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
538                        struct sk_buff *, int *diff);
539
540         /* input hook: return false if can't linearize. diff set for TCP. */
541         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
542                       struct sk_buff *, int *diff);
543
544         /* ip_vs_app initializer */
545         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
546
547         /* ip_vs_app finish */
548         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
549
550
551         /* not used now */
552         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
553                          struct ip_vs_protocol *);
554
555         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
556
557         int *                   timeout_table;
558         int *                   timeouts;
559         int                     timeouts_size;
560
561         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
562                              int *verdict, struct ip_vs_conn **cpp);
563
564         struct ip_vs_conn *
565         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
566                        const struct iphdr *iph, unsigned int proto_off,
567                        int inverse);
568
569         struct ip_vs_conn *
570         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
571                         const struct iphdr *iph, unsigned int proto_off,
572                         int inverse);
573
574         int (*state_transition)(struct ip_vs_conn *cp, int direction,
575                                 const struct sk_buff *skb,
576                                 struct ip_vs_app *app);
577
578         void (*timeout_change)(struct ip_vs_app *app, int flags);
579 };
580
581
582 /*
583  *      IPVS core functions
584  *      (from ip_vs_core.c)
585  */
586 extern const char *ip_vs_proto_name(unsigned proto);
587 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
588 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
589
590 #define IP_VS_APP_TYPE_FTP      1
591
592 /*
593  *     ip_vs_conn handling functions
594  *     (from ip_vs_conn.c)
595  */
596
597 /*
598  *     IPVS connection entry hash table
599  */
600 #ifndef CONFIG_IP_VS_TAB_BITS
601 #define CONFIG_IP_VS_TAB_BITS   12
602 #endif
603
604 #define IP_VS_CONN_TAB_BITS     CONFIG_IP_VS_TAB_BITS
605 #define IP_VS_CONN_TAB_SIZE     (1 << IP_VS_CONN_TAB_BITS)
606 #define IP_VS_CONN_TAB_MASK     (IP_VS_CONN_TAB_SIZE - 1)
607
608 enum {
609         IP_VS_DIR_INPUT = 0,
610         IP_VS_DIR_OUTPUT,
611         IP_VS_DIR_INPUT_ONLY,
612         IP_VS_DIR_LAST,
613 };
614
615 extern struct ip_vs_conn *ip_vs_conn_in_get
616 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
617  const union nf_inet_addr *d_addr, __be16 d_port);
618
619 extern struct ip_vs_conn *ip_vs_ct_in_get
620 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
621  const union nf_inet_addr *d_addr, __be16 d_port);
622
623 extern struct ip_vs_conn *ip_vs_conn_out_get
624 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
625  const union nf_inet_addr *d_addr, __be16 d_port);
626
627 /* put back the conn without restarting its timer */
628 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
629 {
630         atomic_dec(&cp->refcnt);
631 }
632 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
633 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
634
635 extern struct ip_vs_conn *
636 ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport,
637                const union nf_inet_addr *vaddr, __be16 vport,
638                const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
639                struct ip_vs_dest *dest);
640 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
641
642 extern const char * ip_vs_state_name(__u16 proto, int state);
643
644 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
645 extern int ip_vs_check_template(struct ip_vs_conn *ct);
646 extern void ip_vs_random_dropentry(void);
647 extern int ip_vs_conn_init(void);
648 extern void ip_vs_conn_cleanup(void);
649
650 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
651 {
652         struct ip_vs_conn *ctl_cp = cp->control;
653         if (!ctl_cp) {
654                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
655                               "%s:%d to %s:%d\n",
656                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
657                               ntohs(cp->cport),
658                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
659                               ntohs(cp->vport));
660
661                 return;
662         }
663
664         IP_VS_DBG_BUF(7, "DELeting control for: "
665                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
666                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
667                       ntohs(cp->cport),
668                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
669                       ntohs(ctl_cp->cport));
670
671         cp->control = NULL;
672         if (atomic_read(&ctl_cp->n_control) == 0) {
673                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
674                               "%s:%d to %s:%d\n",
675                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
676                               ntohs(cp->cport),
677                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
678                               ntohs(cp->vport));
679
680                 return;
681         }
682         atomic_dec(&ctl_cp->n_control);
683 }
684
685 static inline void
686 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
687 {
688         if (cp->control) {
689                 IP_VS_ERR_BUF("request control ADD for already controlled: "
690                               "%s:%d to %s:%d\n",
691                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
692                               ntohs(cp->cport),
693                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
694                               ntohs(cp->vport));
695
696                 ip_vs_control_del(cp);
697         }
698
699         IP_VS_DBG_BUF(7, "ADDing control for: "
700                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
701                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
702                       ntohs(cp->cport),
703                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
704                       ntohs(ctl_cp->cport));
705
706         cp->control = ctl_cp;
707         atomic_inc(&ctl_cp->n_control);
708 }
709
710
711 /*
712  *      IPVS application functions
713  *      (from ip_vs_app.c)
714  */
715 #define IP_VS_APP_MAX_PORTS  8
716 extern int register_ip_vs_app(struct ip_vs_app *app);
717 extern void unregister_ip_vs_app(struct ip_vs_app *app);
718 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
719 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
720 extern int
721 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
722 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
723 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
724
725 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
726 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
727 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
728                              char *o_buf, int o_len, char *n_buf, int n_len);
729 extern int ip_vs_app_init(void);
730 extern void ip_vs_app_cleanup(void);
731
732
733 /*
734  *      IPVS protocol functions (from ip_vs_proto.c)
735  */
736 extern int ip_vs_protocol_init(void);
737 extern void ip_vs_protocol_cleanup(void);
738 extern void ip_vs_protocol_timeout_change(int flags);
739 extern int *ip_vs_create_timeout_table(int *table, int size);
740 extern int
741 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
742 extern void
743 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
744                           int offset, const char *msg);
745
746 extern struct ip_vs_protocol ip_vs_protocol_tcp;
747 extern struct ip_vs_protocol ip_vs_protocol_udp;
748 extern struct ip_vs_protocol ip_vs_protocol_icmp;
749 extern struct ip_vs_protocol ip_vs_protocol_esp;
750 extern struct ip_vs_protocol ip_vs_protocol_ah;
751
752
753 /*
754  *      Registering/unregistering scheduler functions
755  *      (from ip_vs_sched.c)
756  */
757 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
758 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
759 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
760                                 struct ip_vs_scheduler *scheduler);
761 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
762 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
763 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
764 extern struct ip_vs_conn *
765 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
766 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
767                         struct ip_vs_protocol *pp);
768
769
770 /*
771  *      IPVS control data and functions (from ip_vs_ctl.c)
772  */
773 extern int sysctl_ip_vs_cache_bypass;
774 extern int sysctl_ip_vs_expire_nodest_conn;
775 extern int sysctl_ip_vs_expire_quiescent_template;
776 extern int sysctl_ip_vs_sync_threshold[2];
777 extern int sysctl_ip_vs_nat_icmp_send;
778 extern struct ip_vs_stats ip_vs_stats;
779 extern const struct ctl_path net_vs_ctl_path[];
780
781 extern struct ip_vs_service *
782 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
783                   const union nf_inet_addr *vaddr, __be16 vport);
784
785 static inline void ip_vs_service_put(struct ip_vs_service *svc)
786 {
787         atomic_dec(&svc->usecnt);
788 }
789
790 extern struct ip_vs_dest *
791 ip_vs_lookup_real_service(int af, __u16 protocol,
792                           const union nf_inet_addr *daddr, __be16 dport);
793
794 extern int ip_vs_use_count_inc(void);
795 extern void ip_vs_use_count_dec(void);
796 extern int ip_vs_control_init(void);
797 extern void ip_vs_control_cleanup(void);
798 extern struct ip_vs_dest *
799 ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
800                 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
801 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
802
803
804 /*
805  *      IPVS sync daemon data and function prototypes
806  *      (from ip_vs_sync.c)
807  */
808 extern volatile int ip_vs_sync_state;
809 extern volatile int ip_vs_master_syncid;
810 extern volatile int ip_vs_backup_syncid;
811 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
812 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
813 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
814 extern int stop_sync_thread(int state);
815 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
816
817
818 /*
819  *      IPVS rate estimator prototypes (from ip_vs_est.c)
820  */
821 extern int ip_vs_estimator_init(void);
822 extern void ip_vs_estimator_cleanup(void);
823 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
824 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
825 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
826
827 /*
828  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
829  */
830 extern int ip_vs_null_xmit
831 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
832 extern int ip_vs_bypass_xmit
833 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
834 extern int ip_vs_nat_xmit
835 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
836 extern int ip_vs_tunnel_xmit
837 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
838 extern int ip_vs_dr_xmit
839 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
840 extern int ip_vs_icmp_xmit
841 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
842 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
843
844 #ifdef CONFIG_IP_VS_IPV6
845 extern int ip_vs_bypass_xmit_v6
846 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
847 extern int ip_vs_nat_xmit_v6
848 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
849 extern int ip_vs_tunnel_xmit_v6
850 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
851 extern int ip_vs_dr_xmit_v6
852 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
853 extern int ip_vs_icmp_xmit_v6
854 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
855  int offset);
856 #endif
857
858 /*
859  *      This is a simple mechanism to ignore packets when
860  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
861  *      we start to drop 1/rate of the packets
862  */
863 extern int ip_vs_drop_rate;
864 extern int ip_vs_drop_counter;
865
866 static __inline__ int ip_vs_todrop(void)
867 {
868         if (!ip_vs_drop_rate) return 0;
869         if (--ip_vs_drop_counter > 0) return 0;
870         ip_vs_drop_counter = ip_vs_drop_rate;
871         return 1;
872 }
873
874 /*
875  *      ip_vs_fwd_tag returns the forwarding tag of the connection
876  */
877 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
878
879 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
880 {
881         char fwd;
882
883         switch (IP_VS_FWD_METHOD(cp)) {
884         case IP_VS_CONN_F_MASQ:
885                 fwd = 'M'; break;
886         case IP_VS_CONN_F_LOCALNODE:
887                 fwd = 'L'; break;
888         case IP_VS_CONN_F_TUNNEL:
889                 fwd = 'T'; break;
890         case IP_VS_CONN_F_DROUTE:
891                 fwd = 'R'; break;
892         case IP_VS_CONN_F_BYPASS:
893                 fwd = 'B'; break;
894         default:
895                 fwd = '?'; break;
896         }
897         return fwd;
898 }
899
900 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
901                            struct ip_vs_conn *cp, int dir);
902
903 #ifdef CONFIG_IP_VS_IPV6
904 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
905                               struct ip_vs_conn *cp, int dir);
906 #endif
907
908 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
909
910 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
911 {
912         __be32 diff[2] = { ~old, new };
913
914         return csum_partial(diff, sizeof(diff), oldsum);
915 }
916
917 #ifdef CONFIG_IP_VS_IPV6
918 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
919                                         __wsum oldsum)
920 {
921         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
922                             new[3],  new[2],  new[1],  new[0] };
923
924         return csum_partial(diff, sizeof(diff), oldsum);
925 }
926 #endif
927
928 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
929 {
930         __be16 diff[2] = { ~old, new };
931
932         return csum_partial(diff, sizeof(diff), oldsum);
933 }
934
935 #endif /* __KERNEL__ */
936
937 #endif  /* _NET_IP_VS_H */