net: cleanup include/net
[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         struct ip_vs_stats_user ustats;         /* statistics */
256         struct ip_vs_estimator  est;            /* estimator */
257
258         spinlock_t              lock;           /* spin lock */
259 };
260
261 struct dst_entry;
262 struct iphdr;
263 struct ip_vs_conn;
264 struct ip_vs_app;
265 struct sk_buff;
266
267 struct ip_vs_protocol {
268         struct ip_vs_protocol   *next;
269         char                    *name;
270         u16                     protocol;
271         u16                     num_states;
272         int                     dont_defrag;
273         atomic_t                appcnt;         /* counter of proto app incs */
274         int                     *timeout_table; /* protocol timeout table */
275
276         void (*init)(struct ip_vs_protocol *pp);
277
278         void (*exit)(struct ip_vs_protocol *pp);
279
280         int (*conn_schedule)(int af, struct sk_buff *skb,
281                              struct ip_vs_protocol *pp,
282                              int *verdict, struct ip_vs_conn **cpp);
283
284         struct ip_vs_conn *
285         (*conn_in_get)(int af,
286                        const struct sk_buff *skb,
287                        struct ip_vs_protocol *pp,
288                        const struct ip_vs_iphdr *iph,
289                        unsigned int proto_off,
290                        int inverse);
291
292         struct ip_vs_conn *
293         (*conn_out_get)(int af,
294                         const struct sk_buff *skb,
295                         struct ip_vs_protocol *pp,
296                         const struct ip_vs_iphdr *iph,
297                         unsigned int proto_off,
298                         int inverse);
299
300         int (*snat_handler)(struct sk_buff *skb,
301                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
302
303         int (*dnat_handler)(struct sk_buff *skb,
304                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
305
306         int (*csum_check)(int af, struct sk_buff *skb,
307                           struct ip_vs_protocol *pp);
308
309         const char *(*state_name)(int state);
310
311         int (*state_transition)(struct ip_vs_conn *cp, int direction,
312                                 const struct sk_buff *skb,
313                                 struct ip_vs_protocol *pp);
314
315         int (*register_app)(struct ip_vs_app *inc);
316
317         void (*unregister_app)(struct ip_vs_app *inc);
318
319         int (*app_conn_bind)(struct ip_vs_conn *cp);
320
321         void (*debug_packet)(struct ip_vs_protocol *pp,
322                              const struct sk_buff *skb,
323                              int offset,
324                              const char *msg);
325
326         void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
327
328         int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
329 };
330
331 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
332
333 /*
334  *      IP_VS structure allocated for each dynamically scheduled connection
335  */
336 struct ip_vs_conn {
337         struct list_head        c_list;         /* hashed list heads */
338
339         /* Protocol, addresses and port numbers */
340         u16                      af;            /* address family */
341         union nf_inet_addr       caddr;          /* client address */
342         union nf_inet_addr       vaddr;          /* virtual address */
343         union nf_inet_addr       daddr;          /* destination address */
344         __be16                   cport;
345         __be16                   vport;
346         __be16                   dport;
347         __u16                   protocol;       /* Which protocol (TCP/UDP) */
348
349         /* counter and timer */
350         atomic_t                refcnt;         /* reference count */
351         struct timer_list       timer;          /* Expiration timer */
352         volatile unsigned long  timeout;        /* timeout */
353
354         /* Flags and state transition */
355         spinlock_t              lock;           /* lock for state transition */
356         volatile __u16          flags;          /* status flags */
357         volatile __u16          state;          /* state info */
358         volatile __u16          old_state;      /* old state, to be used for
359                                                  * state transition triggerd
360                                                  * synchronization
361                                                  */
362
363         /* Control members */
364         struct ip_vs_conn       *control;       /* Master control connection */
365         atomic_t                n_control;      /* Number of controlled ones */
366         struct ip_vs_dest       *dest;          /* real server */
367         atomic_t                in_pkts;        /* incoming packet counter */
368
369         /* packet transmitter for different forwarding methods.  If it
370            mangles the packet, it must return NF_DROP or better NF_STOLEN,
371            otherwise this must be changed to a sk_buff **.
372          */
373         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
374                            struct ip_vs_protocol *pp);
375
376         /* Note: we can group the following members into a structure,
377            in order to save more space, and the following members are
378            only used in VS/NAT anyway */
379         struct ip_vs_app        *app;           /* bound ip_vs_app object */
380         void                    *app_data;      /* Application private data */
381         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
382         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
383 };
384
385
386 /*
387  *      Extended internal versions of struct ip_vs_service_user and
388  *      ip_vs_dest_user for IPv6 support.
389  *
390  *      We need these to conveniently pass around service and destination
391  *      options, but unfortunately, we also need to keep the old definitions to
392  *      maintain userspace backwards compatibility for the setsockopt interface.
393  */
394 struct ip_vs_service_user_kern {
395         /* virtual service addresses */
396         u16                     af;
397         u16                     protocol;
398         union nf_inet_addr      addr;           /* virtual ip address */
399         u16                     port;
400         u32                     fwmark;         /* firwall mark of service */
401
402         /* virtual service options */
403         char                    *sched_name;
404         unsigned                flags;          /* virtual service flags */
405         unsigned                timeout;        /* persistent timeout in sec */
406         u32                     netmask;        /* persistent netmask */
407 };
408
409
410 struct ip_vs_dest_user_kern {
411         /* destination server address */
412         union nf_inet_addr      addr;
413         u16                     port;
414
415         /* real server options */
416         unsigned                conn_flags;     /* connection flags */
417         int                     weight;         /* destination weight */
418
419         /* thresholds for active connections */
420         u32                     u_threshold;    /* upper threshold */
421         u32                     l_threshold;    /* lower threshold */
422 };
423
424
425 /*
426  *      The information about the virtual service offered to the net
427  *      and the forwarding entries
428  */
429 struct ip_vs_service {
430         struct list_head        s_list;   /* for normal service table */
431         struct list_head        f_list;   /* for fwmark-based service table */
432         atomic_t                refcnt;   /* reference counter */
433         atomic_t                usecnt;   /* use counter */
434
435         u16                     af;       /* address family */
436         __u16                   protocol; /* which protocol (TCP/UDP) */
437         union nf_inet_addr      addr;     /* IP address for virtual service */
438         __be16                  port;     /* port number for the service */
439         __u32                   fwmark;   /* firewall mark of the service */
440         unsigned                flags;    /* service status flags */
441         unsigned                timeout;  /* persistent timeout in ticks */
442         __be32                  netmask;  /* grouping granularity */
443
444         struct list_head        destinations;  /* real server d-linked list */
445         __u32                   num_dests;     /* number of servers */
446         struct ip_vs_stats      stats;         /* statistics for the service */
447         struct ip_vs_app        *inc;     /* bind conns to this app inc */
448
449         /* for scheduling */
450         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
451         rwlock_t                sched_lock;    /* lock sched_data */
452         void                    *sched_data;   /* scheduler application data */
453 };
454
455
456 /*
457  *      The real server destination forwarding entry
458  *      with ip address, port number, and so on.
459  */
460 struct ip_vs_dest {
461         struct list_head        n_list;   /* for the dests in the service */
462         struct list_head        d_list;   /* for table with all the dests */
463
464         u16                     af;             /* address family */
465         union nf_inet_addr      addr;           /* IP address of the server */
466         __be16                  port;           /* port number of the server */
467         volatile unsigned       flags;          /* dest status flags */
468         atomic_t                conn_flags;     /* flags to copy to conn */
469         atomic_t                weight;         /* server weight */
470
471         atomic_t                refcnt;         /* reference counter */
472         struct ip_vs_stats      stats;          /* statistics */
473
474         /* connection counters and thresholds */
475         atomic_t                activeconns;    /* active connections */
476         atomic_t                inactconns;     /* inactive connections */
477         atomic_t                persistconns;   /* persistent connections */
478         __u32                   u_threshold;    /* upper threshold */
479         __u32                   l_threshold;    /* lower threshold */
480
481         /* for destination cache */
482         spinlock_t              dst_lock;       /* lock of dst_cache */
483         struct dst_entry        *dst_cache;     /* destination cache entry */
484         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
485
486         /* for virtual service */
487         struct ip_vs_service    *svc;           /* service it belongs to */
488         __u16                   protocol;       /* which protocol (TCP/UDP) */
489         union nf_inet_addr      vaddr;          /* virtual IP address */
490         __be16                  vport;          /* virtual port number */
491         __u32                   vfwmark;        /* firewall mark of service */
492 };
493
494
495 /*
496  *      The scheduler object
497  */
498 struct ip_vs_scheduler {
499         struct list_head        n_list;         /* d-linked list head */
500         char                    *name;          /* scheduler name */
501         atomic_t                refcnt;         /* reference counter */
502         struct module           *module;        /* THIS_MODULE/NULL */
503
504         /* scheduler initializing service */
505         int (*init_service)(struct ip_vs_service *svc);
506         /* scheduling service finish */
507         int (*done_service)(struct ip_vs_service *svc);
508         /* scheduler updating service */
509         int (*update_service)(struct ip_vs_service *svc);
510
511         /* selecting a server from the given service */
512         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
513                                        const struct sk_buff *skb);
514 };
515
516
517 /*
518  *      The application module object (a.k.a. app incarnation)
519  */
520 struct ip_vs_app {
521         struct list_head        a_list;         /* member in app list */
522         int                     type;           /* IP_VS_APP_TYPE_xxx */
523         char                    *name;          /* application module name */
524         __u16                   protocol;
525         struct module           *module;        /* THIS_MODULE/NULL */
526         struct list_head        incs_list;      /* list of incarnations */
527
528         /* members for application incarnations */
529         struct list_head        p_list;         /* member in proto app list */
530         struct ip_vs_app        *app;           /* its real application */
531         __be16                  port;           /* port number in net order */
532         atomic_t                usecnt;         /* usage counter */
533
534         /* output hook: return false if can't linearize. diff set for TCP.  */
535         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
536                        struct sk_buff *, int *diff);
537
538         /* input hook: return false if can't linearize. diff set for TCP. */
539         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
540                       struct sk_buff *, int *diff);
541
542         /* ip_vs_app initializer */
543         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
544
545         /* ip_vs_app finish */
546         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
547
548
549         /* not used now */
550         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
551                          struct ip_vs_protocol *);
552
553         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
554
555         int *                   timeout_table;
556         int *                   timeouts;
557         int                     timeouts_size;
558
559         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
560                              int *verdict, struct ip_vs_conn **cpp);
561
562         struct ip_vs_conn *
563         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
564                        const struct iphdr *iph, unsigned int proto_off,
565                        int inverse);
566
567         struct ip_vs_conn *
568         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
569                         const struct iphdr *iph, unsigned int proto_off,
570                         int inverse);
571
572         int (*state_transition)(struct ip_vs_conn *cp, int direction,
573                                 const struct sk_buff *skb,
574                                 struct ip_vs_app *app);
575
576         void (*timeout_change)(struct ip_vs_app *app, int flags);
577 };
578
579
580 /*
581  *      IPVS core functions
582  *      (from ip_vs_core.c)
583  */
584 extern const char *ip_vs_proto_name(unsigned proto);
585 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
586 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
587
588 #define IP_VS_APP_TYPE_FTP      1
589
590 /*
591  *     ip_vs_conn handling functions
592  *     (from ip_vs_conn.c)
593  */
594
595 /*
596  *     IPVS connection entry hash table
597  */
598 #ifndef CONFIG_IP_VS_TAB_BITS
599 #define CONFIG_IP_VS_TAB_BITS   12
600 #endif
601
602 #define IP_VS_CONN_TAB_BITS     CONFIG_IP_VS_TAB_BITS
603 #define IP_VS_CONN_TAB_SIZE     (1 << IP_VS_CONN_TAB_BITS)
604 #define IP_VS_CONN_TAB_MASK     (IP_VS_CONN_TAB_SIZE - 1)
605
606 enum {
607         IP_VS_DIR_INPUT = 0,
608         IP_VS_DIR_OUTPUT,
609         IP_VS_DIR_INPUT_ONLY,
610         IP_VS_DIR_LAST,
611 };
612
613 extern struct ip_vs_conn *ip_vs_conn_in_get
614 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
615  const union nf_inet_addr *d_addr, __be16 d_port);
616
617 extern struct ip_vs_conn *ip_vs_ct_in_get
618 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
619  const union nf_inet_addr *d_addr, __be16 d_port);
620
621 extern struct ip_vs_conn *ip_vs_conn_out_get
622 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
623  const union nf_inet_addr *d_addr, __be16 d_port);
624
625 /* put back the conn without restarting its timer */
626 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
627 {
628         atomic_dec(&cp->refcnt);
629 }
630 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
631 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
632
633 extern struct ip_vs_conn *
634 ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport,
635                const union nf_inet_addr *vaddr, __be16 vport,
636                const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
637                struct ip_vs_dest *dest);
638 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
639
640 extern const char * ip_vs_state_name(__u16 proto, int state);
641
642 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
643 extern int ip_vs_check_template(struct ip_vs_conn *ct);
644 extern void ip_vs_random_dropentry(void);
645 extern int ip_vs_conn_init(void);
646 extern void ip_vs_conn_cleanup(void);
647
648 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
649 {
650         struct ip_vs_conn *ctl_cp = cp->control;
651         if (!ctl_cp) {
652                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
653                               "%s:%d to %s:%d\n",
654                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
655                               ntohs(cp->cport),
656                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
657                               ntohs(cp->vport));
658
659                 return;
660         }
661
662         IP_VS_DBG_BUF(7, "DELeting control for: "
663                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
664                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
665                       ntohs(cp->cport),
666                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
667                       ntohs(ctl_cp->cport));
668
669         cp->control = NULL;
670         if (atomic_read(&ctl_cp->n_control) == 0) {
671                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
672                               "%s:%d to %s:%d\n",
673                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
674                               ntohs(cp->cport),
675                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
676                               ntohs(cp->vport));
677
678                 return;
679         }
680         atomic_dec(&ctl_cp->n_control);
681 }
682
683 static inline void
684 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
685 {
686         if (cp->control) {
687                 IP_VS_ERR_BUF("request control ADD for already controlled: "
688                               "%s:%d to %s:%d\n",
689                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
690                               ntohs(cp->cport),
691                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
692                               ntohs(cp->vport));
693
694                 ip_vs_control_del(cp);
695         }
696
697         IP_VS_DBG_BUF(7, "ADDing control for: "
698                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
699                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
700                       ntohs(cp->cport),
701                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
702                       ntohs(ctl_cp->cport));
703
704         cp->control = ctl_cp;
705         atomic_inc(&ctl_cp->n_control);
706 }
707
708
709 /*
710  *      IPVS application functions
711  *      (from ip_vs_app.c)
712  */
713 #define IP_VS_APP_MAX_PORTS  8
714 extern int register_ip_vs_app(struct ip_vs_app *app);
715 extern void unregister_ip_vs_app(struct ip_vs_app *app);
716 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
717 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
718 extern int
719 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
720 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
721 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
722
723 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
724 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
725 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
726                              char *o_buf, int o_len, char *n_buf, int n_len);
727 extern int ip_vs_app_init(void);
728 extern void ip_vs_app_cleanup(void);
729
730
731 /*
732  *      IPVS protocol functions (from ip_vs_proto.c)
733  */
734 extern int ip_vs_protocol_init(void);
735 extern void ip_vs_protocol_cleanup(void);
736 extern void ip_vs_protocol_timeout_change(int flags);
737 extern int *ip_vs_create_timeout_table(int *table, int size);
738 extern int
739 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
740                         const char *name, int to);
741 extern void
742 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
743                           int offset, const char *msg);
744
745 extern struct ip_vs_protocol ip_vs_protocol_tcp;
746 extern struct ip_vs_protocol ip_vs_protocol_udp;
747 extern struct ip_vs_protocol ip_vs_protocol_icmp;
748 extern struct ip_vs_protocol ip_vs_protocol_esp;
749 extern struct ip_vs_protocol ip_vs_protocol_ah;
750
751
752 /*
753  *      Registering/unregistering scheduler functions
754  *      (from ip_vs_sched.c)
755  */
756 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
757 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
758 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
759                                 struct ip_vs_scheduler *scheduler);
760 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
761 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
762 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
763 extern struct ip_vs_conn *
764 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
765 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
766                         struct ip_vs_protocol *pp);
767
768
769 /*
770  *      IPVS control data and functions (from ip_vs_ctl.c)
771  */
772 extern int sysctl_ip_vs_cache_bypass;
773 extern int sysctl_ip_vs_expire_nodest_conn;
774 extern int sysctl_ip_vs_expire_quiescent_template;
775 extern int sysctl_ip_vs_sync_threshold[2];
776 extern int sysctl_ip_vs_nat_icmp_send;
777 extern struct ip_vs_stats ip_vs_stats;
778 extern const struct ctl_path net_vs_ctl_path[];
779
780 extern struct ip_vs_service *
781 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
782                   const union nf_inet_addr *vaddr, __be16 vport);
783
784 static inline void ip_vs_service_put(struct ip_vs_service *svc)
785 {
786         atomic_dec(&svc->usecnt);
787 }
788
789 extern struct ip_vs_dest *
790 ip_vs_lookup_real_service(int af, __u16 protocol,
791                           const union nf_inet_addr *daddr, __be16 dport);
792
793 extern int ip_vs_use_count_inc(void);
794 extern void ip_vs_use_count_dec(void);
795 extern int ip_vs_control_init(void);
796 extern void ip_vs_control_cleanup(void);
797 extern struct ip_vs_dest *
798 ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
799                 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
800 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
801
802
803 /*
804  *      IPVS sync daemon data and function prototypes
805  *      (from ip_vs_sync.c)
806  */
807 extern volatile int ip_vs_sync_state;
808 extern volatile int ip_vs_master_syncid;
809 extern volatile int ip_vs_backup_syncid;
810 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
811 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
812 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
813 extern int stop_sync_thread(int state);
814 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
815
816
817 /*
818  *      IPVS rate estimator prototypes (from ip_vs_est.c)
819  */
820 extern int ip_vs_estimator_init(void);
821 extern void ip_vs_estimator_cleanup(void);
822 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
823 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
824 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
825
826 /*
827  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
828  */
829 extern int ip_vs_null_xmit
830 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
831 extern int ip_vs_bypass_xmit
832 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
833 extern int ip_vs_nat_xmit
834 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
835 extern int ip_vs_tunnel_xmit
836 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
837 extern int ip_vs_dr_xmit
838 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
839 extern int ip_vs_icmp_xmit
840 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
841 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
842
843 #ifdef CONFIG_IP_VS_IPV6
844 extern int ip_vs_bypass_xmit_v6
845 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
846 extern int ip_vs_nat_xmit_v6
847 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
848 extern int ip_vs_tunnel_xmit_v6
849 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
850 extern int ip_vs_dr_xmit_v6
851 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
852 extern int ip_vs_icmp_xmit_v6
853 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
854  int offset);
855 #endif
856
857 /*
858  *      This is a simple mechanism to ignore packets when
859  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
860  *      we start to drop 1/rate of the packets
861  */
862 extern int ip_vs_drop_rate;
863 extern int ip_vs_drop_counter;
864
865 static __inline__ int ip_vs_todrop(void)
866 {
867         if (!ip_vs_drop_rate) return 0;
868         if (--ip_vs_drop_counter > 0) return 0;
869         ip_vs_drop_counter = ip_vs_drop_rate;
870         return 1;
871 }
872
873 /*
874  *      ip_vs_fwd_tag returns the forwarding tag of the connection
875  */
876 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
877
878 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
879 {
880         char fwd;
881
882         switch (IP_VS_FWD_METHOD(cp)) {
883         case IP_VS_CONN_F_MASQ:
884                 fwd = 'M'; break;
885         case IP_VS_CONN_F_LOCALNODE:
886                 fwd = 'L'; break;
887         case IP_VS_CONN_F_TUNNEL:
888                 fwd = 'T'; break;
889         case IP_VS_CONN_F_DROUTE:
890                 fwd = 'R'; break;
891         case IP_VS_CONN_F_BYPASS:
892                 fwd = 'B'; break;
893         default:
894                 fwd = '?'; break;
895         }
896         return fwd;
897 }
898
899 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
900                            struct ip_vs_conn *cp, int dir);
901
902 #ifdef CONFIG_IP_VS_IPV6
903 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
904                               struct ip_vs_conn *cp, int dir);
905 #endif
906
907 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
908
909 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
910 {
911         __be32 diff[2] = { ~old, new };
912
913         return csum_partial(diff, sizeof(diff), oldsum);
914 }
915
916 #ifdef CONFIG_IP_VS_IPV6
917 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
918                                         __wsum oldsum)
919 {
920         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
921                             new[3],  new[2],  new[1],  new[0] };
922
923         return csum_partial(diff, sizeof(diff), oldsum);
924 }
925 #endif
926
927 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
928 {
929         __be16 diff[2] = { ~old, new };
930
931         return csum_partial(diff, sizeof(diff), oldsum);
932 }
933
934 #endif /* __KERNEL__ */
935
936 #endif  /* _NET_IP_VS_H */