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TOMOYO Linux Cross Reference
Linux/include/net/ip_vs.h

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  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, const char *const *names,
742                         const char *name, int to);
743 extern void
744 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
745                           int offset, const char *msg);
746 
747 extern struct ip_vs_protocol ip_vs_protocol_tcp;
748 extern struct ip_vs_protocol ip_vs_protocol_udp;
749 extern struct ip_vs_protocol ip_vs_protocol_icmp;
750 extern struct ip_vs_protocol ip_vs_protocol_esp;
751 extern struct ip_vs_protocol ip_vs_protocol_ah;
752 
753 
754 /*
755  *      Registering/unregistering scheduler functions
756  *      (from ip_vs_sched.c)
757  */
758 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
759 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
760 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
761                                 struct ip_vs_scheduler *scheduler);
762 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
763 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
764 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
765 extern struct ip_vs_conn *
766 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
767 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
768                         struct ip_vs_protocol *pp);
769 
770 
771 /*
772  *      IPVS control data and functions (from ip_vs_ctl.c)
773  */
774 extern int sysctl_ip_vs_cache_bypass;
775 extern int sysctl_ip_vs_expire_nodest_conn;
776 extern int sysctl_ip_vs_expire_quiescent_template;
777 extern int sysctl_ip_vs_sync_threshold[2];
778 extern int sysctl_ip_vs_nat_icmp_send;
779 extern struct ip_vs_stats ip_vs_stats;
780 extern const struct ctl_path net_vs_ctl_path[];
781 
782 extern struct ip_vs_service *
783 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
784                   const union nf_inet_addr *vaddr, __be16 vport);
785 
786 static inline void ip_vs_service_put(struct ip_vs_service *svc)
787 {
788         atomic_dec(&svc->usecnt);
789 }
790 
791 extern struct ip_vs_dest *
792 ip_vs_lookup_real_service(int af, __u16 protocol,
793                           const union nf_inet_addr *daddr, __be16 dport);
794 
795 extern int ip_vs_use_count_inc(void);
796 extern void ip_vs_use_count_dec(void);
797 extern int ip_vs_control_init(void);
798 extern void ip_vs_control_cleanup(void);
799 extern struct ip_vs_dest *
800 ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
801                 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
802 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
803 
804 
805 /*
806  *      IPVS sync daemon data and function prototypes
807  *      (from ip_vs_sync.c)
808  */
809 extern volatile int ip_vs_sync_state;
810 extern volatile int ip_vs_master_syncid;
811 extern volatile int ip_vs_backup_syncid;
812 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
813 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
814 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
815 extern int stop_sync_thread(int state);
816 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
817 
818 
819 /*
820  *      IPVS rate estimator prototypes (from ip_vs_est.c)
821  */
822 extern int ip_vs_estimator_init(void);
823 extern void ip_vs_estimator_cleanup(void);
824 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
825 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
826 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
827 
828 /*
829  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
830  */
831 extern int ip_vs_null_xmit
832 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
833 extern int ip_vs_bypass_xmit
834 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
835 extern int ip_vs_nat_xmit
836 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
837 extern int ip_vs_tunnel_xmit
838 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
839 extern int ip_vs_dr_xmit
840 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
841 extern int ip_vs_icmp_xmit
842 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
843 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
844 
845 #ifdef CONFIG_IP_VS_IPV6
846 extern int ip_vs_bypass_xmit_v6
847 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
848 extern int ip_vs_nat_xmit_v6
849 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
850 extern int ip_vs_tunnel_xmit_v6
851 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
852 extern int ip_vs_dr_xmit_v6
853 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
854 extern int ip_vs_icmp_xmit_v6
855 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
856  int offset);
857 #endif
858 
859 /*
860  *      This is a simple mechanism to ignore packets when
861  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
862  *      we start to drop 1/rate of the packets
863  */
864 extern int ip_vs_drop_rate;
865 extern int ip_vs_drop_counter;
866 
867 static __inline__ int ip_vs_todrop(void)
868 {
869         if (!ip_vs_drop_rate) return 0;
870         if (--ip_vs_drop_counter > 0) return 0;
871         ip_vs_drop_counter = ip_vs_drop_rate;
872         return 1;
873 }
874 
875 /*
876  *      ip_vs_fwd_tag returns the forwarding tag of the connection
877  */
878 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
879 
880 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
881 {
882         char fwd;
883 
884         switch (IP_VS_FWD_METHOD(cp)) {
885         case IP_VS_CONN_F_MASQ:
886                 fwd = 'M'; break;
887         case IP_VS_CONN_F_LOCALNODE:
888                 fwd = 'L'; break;
889         case IP_VS_CONN_F_TUNNEL:
890                 fwd = 'T'; break;
891         case IP_VS_CONN_F_DROUTE:
892                 fwd = 'R'; break;
893         case IP_VS_CONN_F_BYPASS:
894                 fwd = 'B'; break;
895         default:
896                 fwd = '?'; break;
897         }
898         return fwd;
899 }
900 
901 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
902                            struct ip_vs_conn *cp, int dir);
903 
904 #ifdef CONFIG_IP_VS_IPV6
905 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
906                               struct ip_vs_conn *cp, int dir);
907 #endif
908 
909 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
910 
911 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
912 {
913         __be32 diff[2] = { ~old, new };
914 
915         return csum_partial(diff, sizeof(diff), oldsum);
916 }
917 
918 #ifdef CONFIG_IP_VS_IPV6
919 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
920                                         __wsum oldsum)
921 {
922         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
923                             new[3],  new[2],  new[1],  new[0] };
924 
925         return csum_partial(diff, sizeof(diff), oldsum);
926 }
927 #endif
928 
929 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
930 {
931         __be16 diff[2] = { ~old, new };
932 
933         return csum_partial(diff, sizeof(diff), oldsum);
934 }
935 
936 #endif /* __KERNEL__ */
937 
938 #endif  /* _NET_IP_VS_H */
939 

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