3 * data structure and functionality definitions
9 #include <asm/types.h> /* For __uXX types */
10 #include <linux/types.h> /* For __beXX types in userland */
12 #define IP_VS_VERSION_CODE 0x010201
13 #define NVERSION(version) \
14 (version >> 16) & 0xFF, \
15 (version >> 8) & 0xFF, \
19 * Virtual Service Flags
21 #define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */
22 #define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */
25 * Destination Server Flags
27 #define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */
28 #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */
31 * IPVS sync daemon states
33 #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */
34 #define IP_VS_STATE_MASTER 0x0001 /* started as master */
35 #define IP_VS_STATE_BACKUP 0x0002 /* started as backup */
40 #define IP_VS_BASE_CTL (64+1024+64) /* base */
42 #define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */
43 #define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1)
44 #define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2)
45 #define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3)
46 #define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4)
47 #define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5)
48 #define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6)
49 #define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7)
50 #define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8)
51 #define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9)
52 #define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10)
53 #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11)
54 #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12)
55 #define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13)
56 #define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14)
57 #define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15)
58 #define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO
60 #define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL
61 #define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1)
62 #define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2)
63 #define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3)
64 #define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4)
65 #define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */
66 #define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6)
67 #define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7)
68 #define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON
72 * IPVS Connection Flags
74 #define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */
75 #define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */
76 #define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */
77 #define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */
78 #define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */
79 #define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */
80 #define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */
81 #define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */
82 #define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */
83 #define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */
84 #define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */
85 #define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */
86 #define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */
87 #define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */
88 #define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */
90 /* Move it to better place one day, for now keep it unique */
91 #define NFC_IPVS_PROPERTY 0x10000
93 #define IP_VS_SCHEDNAME_MAXLEN 16
94 #define IP_VS_IFNAME_MAXLEN 16
98 * The struct ip_vs_service_user and struct ip_vs_dest_user are
99 * used to set IPVS rules through setsockopt.
101 struct ip_vs_service_user {
102 /* virtual service addresses */
104 __be32 addr; /* virtual ip address */
106 u_int32_t fwmark; /* firwall mark of service */
108 /* virtual service options */
109 char sched_name[IP_VS_SCHEDNAME_MAXLEN];
110 unsigned flags; /* virtual service flags */
111 unsigned timeout; /* persistent timeout in sec */
112 __be32 netmask; /* persistent netmask */
116 struct ip_vs_dest_user {
117 /* destination server address */
121 /* real server options */
122 unsigned conn_flags; /* connection flags */
123 int weight; /* destination weight */
125 /* thresholds for active connections */
126 u_int32_t u_threshold; /* upper threshold */
127 u_int32_t l_threshold; /* lower threshold */
132 * IPVS statistics object (for user space)
134 struct ip_vs_stats_user
136 __u32 conns; /* connections scheduled */
137 __u32 inpkts; /* incoming packets */
138 __u32 outpkts; /* outgoing packets */
139 __u64 inbytes; /* incoming bytes */
140 __u64 outbytes; /* outgoing bytes */
142 __u32 cps; /* current connection rate */
143 __u32 inpps; /* current in packet rate */
144 __u32 outpps; /* current out packet rate */
145 __u32 inbps; /* current in byte rate */
146 __u32 outbps; /* current out byte rate */
150 /* The argument to IP_VS_SO_GET_INFO */
151 struct ip_vs_getinfo {
153 unsigned int version;
155 /* size of connection hash table */
158 /* number of virtual services */
159 unsigned int num_services;
163 /* The argument to IP_VS_SO_GET_SERVICE */
164 struct ip_vs_service_entry {
165 /* which service: user fills in these */
167 __be32 addr; /* virtual address */
169 u_int32_t fwmark; /* firwall mark of service */
171 /* service options */
172 char sched_name[IP_VS_SCHEDNAME_MAXLEN];
173 unsigned flags; /* virtual service flags */
174 unsigned timeout; /* persistent timeout */
175 __be32 netmask; /* persistent netmask */
177 /* number of real servers */
178 unsigned int num_dests;
181 struct ip_vs_stats_user stats;
185 struct ip_vs_dest_entry {
186 __be32 addr; /* destination address */
188 unsigned conn_flags; /* connection flags */
189 int weight; /* destination weight */
191 u_int32_t u_threshold; /* upper threshold */
192 u_int32_t l_threshold; /* lower threshold */
194 u_int32_t activeconns; /* active connections */
195 u_int32_t inactconns; /* inactive connections */
196 u_int32_t persistconns; /* persistent connections */
199 struct ip_vs_stats_user stats;
203 /* The argument to IP_VS_SO_GET_DESTS */
204 struct ip_vs_get_dests {
205 /* which service: user fills in these */
207 __be32 addr; /* virtual address */
209 u_int32_t fwmark; /* firwall mark of service */
211 /* number of real servers */
212 unsigned int num_dests;
214 /* the real servers */
215 struct ip_vs_dest_entry entrytable[0];
219 /* The argument to IP_VS_SO_GET_SERVICES */
220 struct ip_vs_get_services {
221 /* number of virtual services */
222 unsigned int num_services;
225 struct ip_vs_service_entry entrytable[0];
229 /* The argument to IP_VS_SO_GET_TIMEOUT */
230 struct ip_vs_timeout_user {
237 /* The argument to IP_VS_SO_GET_DAEMON */
238 struct ip_vs_daemon_user {
239 /* sync daemon state (master/backup) */
242 /* multicast interface name */
243 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
245 /* SyncID we belong to */
252 #include <linux/list.h> /* for struct list_head */
253 #include <linux/spinlock.h> /* for struct rwlock_t */
254 #include <asm/atomic.h> /* for struct atomic_t */
255 #include <linux/compiler.h>
256 #include <linux/timer.h>
258 #include <net/checksum.h>
260 #ifdef CONFIG_IP_VS_DEBUG
261 #include <linux/net.h>
263 extern int ip_vs_get_debug_level(void);
264 #define IP_VS_DBG(level, msg...) \
266 if (level <= ip_vs_get_debug_level()) \
267 printk(KERN_DEBUG "IPVS: " msg); \
269 #define IP_VS_DBG_RL(msg...) \
271 if (net_ratelimit()) \
272 printk(KERN_DEBUG "IPVS: " msg); \
274 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \
276 if (level <= ip_vs_get_debug_level()) \
277 pp->debug_packet(pp, skb, ofs, msg); \
279 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \
281 if (level <= ip_vs_get_debug_level() && \
283 pp->debug_packet(pp, skb, ofs, msg); \
285 #else /* NO DEBUGGING at ALL */
286 #define IP_VS_DBG(level, msg...) do {} while (0)
287 #define IP_VS_DBG_RL(msg...) do {} while (0)
288 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0)
289 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0)
292 #define IP_VS_BUG() BUG()
293 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
294 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
295 #define IP_VS_WARNING(msg...) \
296 printk(KERN_WARNING "IPVS: " msg)
297 #define IP_VS_ERR_RL(msg...) \
299 if (net_ratelimit()) \
300 printk(KERN_ERR "IPVS: " msg); \
303 #ifdef CONFIG_IP_VS_DEBUG
304 #define EnterFunction(level) \
306 if (level <= ip_vs_get_debug_level()) \
307 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \
308 __FUNCTION__, __FILE__, __LINE__); \
310 #define LeaveFunction(level) \
312 if (level <= ip_vs_get_debug_level()) \
313 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \
314 __FUNCTION__, __FILE__, __LINE__); \
317 #define EnterFunction(level) do {} while (0)
318 #define LeaveFunction(level) do {} while (0)
321 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
325 * The port number of FTP service (in network order).
327 #define FTPPORT __constant_htons(21)
328 #define FTPDATA __constant_htons(20)
331 * IPVS sysctl variables under the /proc/sys/net/ipv4/vs/
333 #define NET_IPV4_VS 21
336 NET_IPV4_VS_DEBUG_LEVEL=1,
337 NET_IPV4_VS_AMEMTHRESH=2,
338 NET_IPV4_VS_AMDROPRATE=3,
342 NET_IPV4_VS_TO_FW=10,
343 NET_IPV4_VS_TO_TW=11,
344 NET_IPV4_VS_TO_CL=12,
345 NET_IPV4_VS_TO_CW=13,
346 NET_IPV4_VS_TO_LA=14,
347 NET_IPV4_VS_TO_LI=15,
348 NET_IPV4_VS_TO_SA=16,
349 NET_IPV4_VS_TO_UDP=17,
350 NET_IPV4_VS_TO_ICMP=18,
351 NET_IPV4_VS_CACHE_BYPASS=22,
352 NET_IPV4_VS_EXPIRE_NODEST_CONN=23,
353 NET_IPV4_VS_NAT_ICMP_SEND=25,
354 NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE=26,
362 IP_VS_TCP_S_NONE = 0,
363 IP_VS_TCP_S_ESTABLISHED,
364 IP_VS_TCP_S_SYN_SENT,
365 IP_VS_TCP_S_SYN_RECV,
366 IP_VS_TCP_S_FIN_WAIT,
367 IP_VS_TCP_S_TIME_WAIT,
369 IP_VS_TCP_S_CLOSE_WAIT,
370 IP_VS_TCP_S_LAST_ACK,
393 * Delta sequence info structure
394 * Each ip_vs_conn has 2 (output AND input seq. changes).
395 * Only used in the VS/NAT.
398 __u32 init_seq; /* Add delta from this seq */
399 __u32 delta; /* Delta in sequence numbers */
400 __u32 previous_delta; /* Delta in sequence numbers
401 before last resized pkt */
406 * IPVS statistics object
410 __u32 conns; /* connections scheduled */
411 __u32 inpkts; /* incoming packets */
412 __u32 outpkts; /* outgoing packets */
413 __u64 inbytes; /* incoming bytes */
414 __u64 outbytes; /* outgoing bytes */
416 __u32 cps; /* current connection rate */
417 __u32 inpps; /* current in packet rate */
418 __u32 outpps; /* current out packet rate */
419 __u32 inbps; /* current in byte rate */
420 __u32 outbps; /* current out byte rate */
422 spinlock_t lock; /* spin lock */
431 struct ip_vs_protocol {
432 struct ip_vs_protocol *next;
436 atomic_t appcnt; /* counter of proto app incs */
437 int *timeout_table; /* protocol timeout table */
439 void (*init)(struct ip_vs_protocol *pp);
441 void (*exit)(struct ip_vs_protocol *pp);
443 int (*conn_schedule)(struct sk_buff *skb,
444 struct ip_vs_protocol *pp,
445 int *verdict, struct ip_vs_conn **cpp);
448 (*conn_in_get)(const struct sk_buff *skb,
449 struct ip_vs_protocol *pp,
450 const struct iphdr *iph,
451 unsigned int proto_off,
455 (*conn_out_get)(const struct sk_buff *skb,
456 struct ip_vs_protocol *pp,
457 const struct iphdr *iph,
458 unsigned int proto_off,
461 int (*snat_handler)(struct sk_buff *skb,
462 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
464 int (*dnat_handler)(struct sk_buff *skb,
465 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
467 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
469 const char *(*state_name)(int state);
471 int (*state_transition)(struct ip_vs_conn *cp, int direction,
472 const struct sk_buff *skb,
473 struct ip_vs_protocol *pp);
475 int (*register_app)(struct ip_vs_app *inc);
477 void (*unregister_app)(struct ip_vs_app *inc);
479 int (*app_conn_bind)(struct ip_vs_conn *cp);
481 void (*debug_packet)(struct ip_vs_protocol *pp,
482 const struct sk_buff *skb,
486 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
488 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
491 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
494 * IP_VS structure allocated for each dynamically scheduled connection
497 struct list_head c_list; /* hashed list heads */
499 /* Protocol, addresses and port numbers */
500 __be32 caddr; /* client address */
501 __be32 vaddr; /* virtual address */
502 __be32 daddr; /* destination address */
506 __u16 protocol; /* Which protocol (TCP/UDP) */
508 /* counter and timer */
509 atomic_t refcnt; /* reference count */
510 struct timer_list timer; /* Expiration timer */
511 volatile unsigned long timeout; /* timeout */
513 /* Flags and state transition */
514 spinlock_t lock; /* lock for state transition */
515 volatile __u16 flags; /* status flags */
516 volatile __u16 state; /* state info */
517 volatile __u16 old_state; /* old state, to be used for
518 * state transition triggerd
522 /* Control members */
523 struct ip_vs_conn *control; /* Master control connection */
524 atomic_t n_control; /* Number of controlled ones */
525 struct ip_vs_dest *dest; /* real server */
526 atomic_t in_pkts; /* incoming packet counter */
528 /* packet transmitter for different forwarding methods. If it
529 mangles the packet, it must return NF_DROP or better NF_STOLEN,
530 otherwise this must be changed to a sk_buff **.
532 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
533 struct ip_vs_protocol *pp);
535 /* Note: we can group the following members into a structure,
536 in order to save more space, and the following members are
537 only used in VS/NAT anyway */
538 struct ip_vs_app *app; /* bound ip_vs_app object */
539 void *app_data; /* Application private data */
540 struct ip_vs_seq in_seq; /* incoming seq. struct */
541 struct ip_vs_seq out_seq; /* outgoing seq. struct */
546 * The information about the virtual service offered to the net
547 * and the forwarding entries
549 struct ip_vs_service {
550 struct list_head s_list; /* for normal service table */
551 struct list_head f_list; /* for fwmark-based service table */
552 atomic_t refcnt; /* reference counter */
553 atomic_t usecnt; /* use counter */
555 __u16 protocol; /* which protocol (TCP/UDP) */
556 __be32 addr; /* IP address for virtual service */
557 __be16 port; /* port number for the service */
558 __u32 fwmark; /* firewall mark of the service */
559 unsigned flags; /* service status flags */
560 unsigned timeout; /* persistent timeout in ticks */
561 __be32 netmask; /* grouping granularity */
563 struct list_head destinations; /* real server d-linked list */
564 __u32 num_dests; /* number of servers */
565 struct ip_vs_stats stats; /* statistics for the service */
566 struct ip_vs_app *inc; /* bind conns to this app inc */
569 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
570 rwlock_t sched_lock; /* lock sched_data */
571 void *sched_data; /* scheduler application data */
576 * The real server destination forwarding entry
577 * with ip address, port number, and so on.
580 struct list_head n_list; /* for the dests in the service */
581 struct list_head d_list; /* for table with all the dests */
583 __be32 addr; /* IP address of the server */
584 __be16 port; /* port number of the server */
585 volatile unsigned flags; /* dest status flags */
586 atomic_t conn_flags; /* flags to copy to conn */
587 atomic_t weight; /* server weight */
589 atomic_t refcnt; /* reference counter */
590 struct ip_vs_stats stats; /* statistics */
592 /* connection counters and thresholds */
593 atomic_t activeconns; /* active connections */
594 atomic_t inactconns; /* inactive connections */
595 atomic_t persistconns; /* persistent connections */
596 __u32 u_threshold; /* upper threshold */
597 __u32 l_threshold; /* lower threshold */
599 /* for destination cache */
600 spinlock_t dst_lock; /* lock of dst_cache */
601 struct dst_entry *dst_cache; /* destination cache entry */
602 u32 dst_rtos; /* RT_TOS(tos) for dst */
604 /* for virtual service */
605 struct ip_vs_service *svc; /* service it belongs to */
606 __u16 protocol; /* which protocol (TCP/UDP) */
607 __be32 vaddr; /* virtual IP address */
608 __be16 vport; /* virtual port number */
609 __u32 vfwmark; /* firewall mark of service */
614 * The scheduler object
616 struct ip_vs_scheduler {
617 struct list_head n_list; /* d-linked list head */
618 char *name; /* scheduler name */
619 atomic_t refcnt; /* reference counter */
620 struct module *module; /* THIS_MODULE/NULL */
622 /* scheduler initializing service */
623 int (*init_service)(struct ip_vs_service *svc);
624 /* scheduling service finish */
625 int (*done_service)(struct ip_vs_service *svc);
626 /* scheduler updating service */
627 int (*update_service)(struct ip_vs_service *svc);
629 /* selecting a server from the given service */
630 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
631 const struct sk_buff *skb);
636 * The application module object (a.k.a. app incarnation)
640 struct list_head a_list; /* member in app list */
641 int type; /* IP_VS_APP_TYPE_xxx */
642 char *name; /* application module name */
644 struct module *module; /* THIS_MODULE/NULL */
645 struct list_head incs_list; /* list of incarnations */
647 /* members for application incarnations */
648 struct list_head p_list; /* member in proto app list */
649 struct ip_vs_app *app; /* its real application */
650 __be16 port; /* port number in net order */
651 atomic_t usecnt; /* usage counter */
653 /* output hook: return false if can't linearize. diff set for TCP. */
654 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
655 struct sk_buff *, int *diff);
657 /* input hook: return false if can't linearize. diff set for TCP. */
658 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
659 struct sk_buff *, int *diff);
661 /* ip_vs_app initializer */
662 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
664 /* ip_vs_app finish */
665 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
669 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
670 struct ip_vs_protocol *);
672 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
678 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
679 int *verdict, struct ip_vs_conn **cpp);
682 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
683 const struct iphdr *iph, unsigned int proto_off,
687 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
688 const struct iphdr *iph, unsigned int proto_off,
691 int (*state_transition)(struct ip_vs_conn *cp, int direction,
692 const struct sk_buff *skb,
693 struct ip_vs_app *app);
695 void (*timeout_change)(struct ip_vs_app *app, int flags);
700 * IPVS core functions
701 * (from ip_vs_core.c)
703 extern const char *ip_vs_proto_name(unsigned proto);
704 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
705 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0]))
707 #define IP_VS_APP_TYPE_UNSPEC 0
708 #define IP_VS_APP_TYPE_FTP 1
711 * ip_vs_conn handling functions
712 * (from ip_vs_conn.c)
716 * IPVS connection entry hash table
718 #ifndef CONFIG_IP_VS_TAB_BITS
719 #define CONFIG_IP_VS_TAB_BITS 12
721 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
722 #if CONFIG_IP_VS_TAB_BITS < 8
723 #define IP_VS_CONN_TAB_BITS 8
725 #if CONFIG_IP_VS_TAB_BITS > 20
726 #define IP_VS_CONN_TAB_BITS 20
728 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
729 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
731 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
732 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
737 IP_VS_DIR_INPUT_ONLY,
741 extern struct ip_vs_conn *ip_vs_conn_in_get
742 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
743 extern struct ip_vs_conn *ip_vs_ct_in_get
744 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
745 extern struct ip_vs_conn *ip_vs_conn_out_get
746 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
748 /* put back the conn without restarting its timer */
749 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
751 atomic_dec(&cp->refcnt);
753 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
754 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
756 extern struct ip_vs_conn *
757 ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport,
758 __be32 daddr, __be16 dport, unsigned flags,
759 struct ip_vs_dest *dest);
760 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
762 extern const char * ip_vs_state_name(__u16 proto, int state);
764 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
765 extern int ip_vs_check_template(struct ip_vs_conn *ct);
766 extern void ip_vs_secure_tcp_set(int on);
767 extern void ip_vs_random_dropentry(void);
768 extern int ip_vs_conn_init(void);
769 extern void ip_vs_conn_cleanup(void);
771 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
773 struct ip_vs_conn *ctl_cp = cp->control;
775 IP_VS_ERR("request control DEL for uncontrolled: "
776 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
777 NIPQUAD(cp->caddr),ntohs(cp->cport),
778 NIPQUAD(cp->vaddr),ntohs(cp->vport));
782 IP_VS_DBG(7, "DELeting control for: "
783 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
784 NIPQUAD(cp->caddr),ntohs(cp->cport),
785 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
788 if (atomic_read(&ctl_cp->n_control) == 0) {
789 IP_VS_ERR("BUG control DEL with n=0 : "
790 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
791 NIPQUAD(cp->caddr),ntohs(cp->cport),
792 NIPQUAD(cp->vaddr),ntohs(cp->vport));
795 atomic_dec(&ctl_cp->n_control);
799 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
802 IP_VS_ERR("request control ADD for already controlled: "
803 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
804 NIPQUAD(cp->caddr),ntohs(cp->cport),
805 NIPQUAD(cp->vaddr),ntohs(cp->vport));
806 ip_vs_control_del(cp);
809 IP_VS_DBG(7, "ADDing control for: "
810 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
811 NIPQUAD(cp->caddr),ntohs(cp->cport),
812 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
814 cp->control = ctl_cp;
815 atomic_inc(&ctl_cp->n_control);
820 * IPVS application functions
823 #define IP_VS_APP_MAX_PORTS 8
824 extern int register_ip_vs_app(struct ip_vs_app *app);
825 extern void unregister_ip_vs_app(struct ip_vs_app *app);
826 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
827 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
829 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
830 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
831 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
833 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
834 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
835 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
836 char *o_buf, int o_len, char *n_buf, int n_len);
837 extern int ip_vs_app_init(void);
838 extern void ip_vs_app_cleanup(void);
842 * IPVS protocol functions (from ip_vs_proto.c)
844 extern int ip_vs_protocol_init(void);
845 extern void ip_vs_protocol_cleanup(void);
846 extern void ip_vs_protocol_timeout_change(int flags);
847 extern int *ip_vs_create_timeout_table(int *table, int size);
849 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
851 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
852 int offset, const char *msg);
854 extern struct ip_vs_protocol ip_vs_protocol_tcp;
855 extern struct ip_vs_protocol ip_vs_protocol_udp;
856 extern struct ip_vs_protocol ip_vs_protocol_icmp;
857 extern struct ip_vs_protocol ip_vs_protocol_esp;
858 extern struct ip_vs_protocol ip_vs_protocol_ah;
862 * Registering/unregistering scheduler functions
863 * (from ip_vs_sched.c)
865 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
866 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
867 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
868 struct ip_vs_scheduler *scheduler);
869 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
870 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
871 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
872 extern struct ip_vs_conn *
873 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
874 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
875 struct ip_vs_protocol *pp);
879 * IPVS control data and functions (from ip_vs_ctl.c)
881 extern int sysctl_ip_vs_cache_bypass;
882 extern int sysctl_ip_vs_expire_nodest_conn;
883 extern int sysctl_ip_vs_expire_quiescent_template;
884 extern int sysctl_ip_vs_sync_threshold[2];
885 extern int sysctl_ip_vs_nat_icmp_send;
886 extern struct ip_vs_stats ip_vs_stats;
888 extern struct ip_vs_service *
889 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
891 static inline void ip_vs_service_put(struct ip_vs_service *svc)
893 atomic_dec(&svc->usecnt);
896 extern struct ip_vs_dest *
897 ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport);
898 extern int ip_vs_use_count_inc(void);
899 extern void ip_vs_use_count_dec(void);
900 extern int ip_vs_control_init(void);
901 extern void ip_vs_control_cleanup(void);
902 extern struct ip_vs_dest *
903 ip_vs_find_dest(__be32 daddr, __be16 dport,
904 __be32 vaddr, __be16 vport, __u16 protocol);
905 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
909 * IPVS sync daemon data and function prototypes
910 * (from ip_vs_sync.c)
912 extern volatile int ip_vs_sync_state;
913 extern volatile int ip_vs_master_syncid;
914 extern volatile int ip_vs_backup_syncid;
915 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
916 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
917 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
918 extern int stop_sync_thread(int state);
919 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
923 * IPVS rate estimator prototypes (from ip_vs_est.c)
925 extern int ip_vs_new_estimator(struct ip_vs_stats *stats);
926 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
927 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
930 * Various IPVS packet transmitters (from ip_vs_xmit.c)
932 extern int ip_vs_null_xmit
933 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
934 extern int ip_vs_bypass_xmit
935 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
936 extern int ip_vs_nat_xmit
937 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
938 extern int ip_vs_tunnel_xmit
939 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
940 extern int ip_vs_dr_xmit
941 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
942 extern int ip_vs_icmp_xmit
943 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
944 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
948 * This is a simple mechanism to ignore packets when
949 * we are loaded. Just set ip_vs_drop_rate to 'n' and
950 * we start to drop 1/rate of the packets
952 extern int ip_vs_drop_rate;
953 extern int ip_vs_drop_counter;
955 static __inline__ int ip_vs_todrop(void)
957 if (!ip_vs_drop_rate) return 0;
958 if (--ip_vs_drop_counter > 0) return 0;
959 ip_vs_drop_counter = ip_vs_drop_rate;
964 * ip_vs_fwd_tag returns the forwarding tag of the connection
966 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
968 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
972 switch (IP_VS_FWD_METHOD(cp)) {
973 case IP_VS_CONN_F_MASQ:
975 case IP_VS_CONN_F_LOCALNODE:
977 case IP_VS_CONN_F_TUNNEL:
979 case IP_VS_CONN_F_DROUTE:
981 case IP_VS_CONN_F_BYPASS:
989 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
990 struct ip_vs_conn *cp, int dir);
992 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
994 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
996 __be32 diff[2] = { ~old, new };
998 return csum_partial((char *) diff, sizeof(diff), oldsum);
1001 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1003 __be16 diff[2] = { ~old, new };
1005 return csum_partial((char *) diff, sizeof(diff), oldsum);
1008 #endif /* __KERNEL__ */
1010 #endif /* _IP_VS_H */