3 * data structure and functionality definitions
9 #include <linux/ip_vs.h> /* definitions shared with userland */
11 /* old ipvsadm versions still include this file directly */
14 #include <asm/types.h> /* for __uXX types */
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>
23 #include <net/checksum.h>
24 #include <linux/netfilter.h> /* for union nf_inet_addr */
26 #include <linux/ipv6.h> /* for struct ipv6hdr */
27 #include <net/ipv6.h> /* for ipv6_addr_copy */
28 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
29 #include <net/netfilter/nf_conntrack.h>
31 #include <net/net_namespace.h> /* Netw namespace */
34 * Generic access of ipvs struct
36 static inline struct netns_ipvs *net_ipvs(struct net* net)
41 * Get net ptr from skb in traffic cases
42 * use skb_sknet when call is from userland (ioctl or netlink)
44 static inline struct net *skb_net(struct sk_buff *skb)
47 #ifdef CONFIG_IP_VS_DEBUG
49 * This is used for debug only.
50 * Start with the most likely hit
53 if (likely(skb->dev && skb->dev->nd_net))
54 return dev_net(skb->dev);
55 if (skb_dst(skb)->dev)
56 return dev_net(skb_dst(skb)->dev);
57 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
59 if (likely(skb->sk && skb->sk->sk_net))
60 return sock_net(skb->sk);
61 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
65 return dev_net(skb->dev ? : skb_dst(skb)->dev);
72 static inline struct net *skb_sknet(struct sk_buff *skb)
75 #ifdef CONFIG_IP_VS_DEBUG
76 /* Start with the most likely hit */
77 if (likely(skb->sk && skb->sk->sk_net))
78 return sock_net(skb->sk);
79 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
81 if (likely(skb->dev && skb->dev->nd_net))
82 return dev_net(skb->dev);
83 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
87 return sock_net(skb->sk);
94 /* Connections' size value needed by ip_vs_ctl.c */
95 extern int ip_vs_conn_tab_size;
101 union nf_inet_addr saddr;
102 union nf_inet_addr daddr;
106 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
108 #ifdef CONFIG_IP_VS_IPV6
109 if (af == AF_INET6) {
110 const struct ipv6hdr *iph = nh;
111 iphdr->len = sizeof(struct ipv6hdr);
112 iphdr->protocol = iph->nexthdr;
113 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
114 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
118 const struct iphdr *iph = nh;
119 iphdr->len = iph->ihl * 4;
120 iphdr->protocol = iph->protocol;
121 iphdr->saddr.ip = iph->saddr;
122 iphdr->daddr.ip = iph->daddr;
126 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
127 const union nf_inet_addr *src)
129 #ifdef CONFIG_IP_VS_IPV6
131 ipv6_addr_copy(&dst->in6, &src->in6);
137 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
138 const union nf_inet_addr *b)
140 #ifdef CONFIG_IP_VS_IPV6
142 return ipv6_addr_equal(&a->in6, &b->in6);
144 return a->ip == b->ip;
147 #ifdef CONFIG_IP_VS_DEBUG
148 #include <linux/net.h>
150 extern int ip_vs_get_debug_level(void);
152 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
153 const union nf_inet_addr *addr,
157 #ifdef CONFIG_IP_VS_IPV6
159 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
163 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
167 BUG_ON(*idx > buf_len + 1);
168 return &buf[*idx - len];
171 #define IP_VS_DBG_BUF(level, msg, ...) \
173 char ip_vs_dbg_buf[160]; \
174 int ip_vs_dbg_idx = 0; \
175 if (level <= ip_vs_get_debug_level()) \
176 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
178 #define IP_VS_ERR_BUF(msg...) \
180 char ip_vs_dbg_buf[160]; \
181 int ip_vs_dbg_idx = 0; \
185 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
186 #define IP_VS_DBG_ADDR(af, addr) \
187 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
188 sizeof(ip_vs_dbg_buf), addr, \
191 #define IP_VS_DBG(level, msg, ...) \
193 if (level <= ip_vs_get_debug_level()) \
194 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
196 #define IP_VS_DBG_RL(msg, ...) \
198 if (net_ratelimit()) \
199 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
201 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
203 if (level <= ip_vs_get_debug_level()) \
204 pp->debug_packet(af, pp, skb, ofs, msg); \
206 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
208 if (level <= ip_vs_get_debug_level() && \
210 pp->debug_packet(af, pp, skb, ofs, msg); \
212 #else /* NO DEBUGGING at ALL */
213 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
214 #define IP_VS_ERR_BUF(msg...) do {} while (0)
215 #define IP_VS_DBG(level, msg...) do {} while (0)
216 #define IP_VS_DBG_RL(msg...) do {} while (0)
217 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
218 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
221 #define IP_VS_BUG() BUG()
222 #define IP_VS_ERR_RL(msg, ...) \
224 if (net_ratelimit()) \
225 pr_err(msg, ##__VA_ARGS__); \
228 #ifdef CONFIG_IP_VS_DEBUG
229 #define EnterFunction(level) \
231 if (level <= ip_vs_get_debug_level()) \
233 pr_fmt("Enter: %s, %s line %i\n"), \
234 __func__, __FILE__, __LINE__); \
236 #define LeaveFunction(level) \
238 if (level <= ip_vs_get_debug_level()) \
240 pr_fmt("Leave: %s, %s line %i\n"), \
241 __func__, __FILE__, __LINE__); \
244 #define EnterFunction(level) do {} while (0)
245 #define LeaveFunction(level) do {} while (0)
248 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
252 * The port number of FTP service (in network order).
254 #define FTPPORT cpu_to_be16(21)
255 #define FTPDATA cpu_to_be16(20)
261 IP_VS_TCP_S_NONE = 0,
262 IP_VS_TCP_S_ESTABLISHED,
263 IP_VS_TCP_S_SYN_SENT,
264 IP_VS_TCP_S_SYN_RECV,
265 IP_VS_TCP_S_FIN_WAIT,
266 IP_VS_TCP_S_TIME_WAIT,
268 IP_VS_TCP_S_CLOSE_WAIT,
269 IP_VS_TCP_S_LAST_ACK,
294 enum ip_vs_sctp_states {
296 IP_VS_SCTP_S_INIT_CLI,
297 IP_VS_SCTP_S_INIT_SER,
298 IP_VS_SCTP_S_INIT_ACK_CLI,
299 IP_VS_SCTP_S_INIT_ACK_SER,
300 IP_VS_SCTP_S_ECHO_CLI,
301 IP_VS_SCTP_S_ECHO_SER,
302 IP_VS_SCTP_S_ESTABLISHED,
303 IP_VS_SCTP_S_SHUT_CLI,
304 IP_VS_SCTP_S_SHUT_SER,
305 IP_VS_SCTP_S_SHUT_ACK_CLI,
306 IP_VS_SCTP_S_SHUT_ACK_SER,
312 * Delta sequence info structure
313 * Each ip_vs_conn has 2 (output AND input seq. changes).
314 * Only used in the VS/NAT.
317 __u32 init_seq; /* Add delta from this seq */
318 __u32 delta; /* Delta in sequence numbers */
319 __u32 previous_delta; /* Delta in sequence numbers
320 before last resized pkt */
325 * IPVS statistics objects
327 struct ip_vs_estimator {
328 struct list_head list;
344 struct ip_vs_stats_user ustats; /* statistics */
345 struct ip_vs_estimator est; /* estimator */
347 spinlock_t lock; /* spin lock */
356 struct ip_vs_protocol {
357 struct ip_vs_protocol *next;
362 atomic_t appcnt; /* counter of proto app incs */
363 int *timeout_table; /* protocol timeout table */
365 void (*init)(struct ip_vs_protocol *pp);
367 void (*exit)(struct ip_vs_protocol *pp);
369 int (*conn_schedule)(int af, struct sk_buff *skb,
370 struct ip_vs_protocol *pp,
371 int *verdict, struct ip_vs_conn **cpp);
374 (*conn_in_get)(int af,
375 const struct sk_buff *skb,
376 struct ip_vs_protocol *pp,
377 const struct ip_vs_iphdr *iph,
378 unsigned int proto_off,
382 (*conn_out_get)(int af,
383 const struct sk_buff *skb,
384 struct ip_vs_protocol *pp,
385 const struct ip_vs_iphdr *iph,
386 unsigned int proto_off,
389 int (*snat_handler)(struct sk_buff *skb,
390 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
392 int (*dnat_handler)(struct sk_buff *skb,
393 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
395 int (*csum_check)(int af, struct sk_buff *skb,
396 struct ip_vs_protocol *pp);
398 const char *(*state_name)(int state);
400 int (*state_transition)(struct ip_vs_conn *cp, int direction,
401 const struct sk_buff *skb,
402 struct ip_vs_protocol *pp);
404 int (*register_app)(struct ip_vs_app *inc);
406 void (*unregister_app)(struct ip_vs_app *inc);
408 int (*app_conn_bind)(struct ip_vs_conn *cp);
410 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
411 const struct sk_buff *skb,
415 void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
417 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
420 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
422 struct ip_vs_conn_param {
423 const union nf_inet_addr *caddr;
424 const union nf_inet_addr *vaddr;
430 const struct ip_vs_pe *pe;
436 * IP_VS structure allocated for each dynamically scheduled connection
439 struct list_head c_list; /* hashed list heads */
441 /* Protocol, addresses and port numbers */
442 u16 af; /* address family */
443 union nf_inet_addr caddr; /* client address */
444 union nf_inet_addr vaddr; /* virtual address */
445 union nf_inet_addr daddr; /* destination address */
446 volatile __u32 flags; /* status flags */
447 __u32 fwmark; /* Fire wall mark from skb */
451 __u16 protocol; /* Which protocol (TCP/UDP) */
453 /* counter and timer */
454 atomic_t refcnt; /* reference count */
455 struct timer_list timer; /* Expiration timer */
456 volatile unsigned long timeout; /* timeout */
458 /* Flags and state transition */
459 spinlock_t lock; /* lock for state transition */
460 volatile __u16 state; /* state info */
461 volatile __u16 old_state; /* old state, to be used for
462 * state transition triggerd
466 /* Control members */
467 struct ip_vs_conn *control; /* Master control connection */
468 atomic_t n_control; /* Number of controlled ones */
469 struct ip_vs_dest *dest; /* real server */
470 atomic_t in_pkts; /* incoming packet counter */
472 /* packet transmitter for different forwarding methods. If it
473 mangles the packet, it must return NF_DROP or better NF_STOLEN,
474 otherwise this must be changed to a sk_buff **.
475 NF_ACCEPT can be returned when destination is local.
477 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
478 struct ip_vs_protocol *pp);
480 /* Note: we can group the following members into a structure,
481 in order to save more space, and the following members are
482 only used in VS/NAT anyway */
483 struct ip_vs_app *app; /* bound ip_vs_app object */
484 void *app_data; /* Application private data */
485 struct ip_vs_seq in_seq; /* incoming seq. struct */
486 struct ip_vs_seq out_seq; /* outgoing seq. struct */
488 const struct ip_vs_pe *pe;
495 * Extended internal versions of struct ip_vs_service_user and
496 * ip_vs_dest_user for IPv6 support.
498 * We need these to conveniently pass around service and destination
499 * options, but unfortunately, we also need to keep the old definitions to
500 * maintain userspace backwards compatibility for the setsockopt interface.
502 struct ip_vs_service_user_kern {
503 /* virtual service addresses */
506 union nf_inet_addr addr; /* virtual ip address */
508 u32 fwmark; /* firwall mark of service */
510 /* virtual service options */
513 unsigned flags; /* virtual service flags */
514 unsigned timeout; /* persistent timeout in sec */
515 u32 netmask; /* persistent netmask */
519 struct ip_vs_dest_user_kern {
520 /* destination server address */
521 union nf_inet_addr addr;
524 /* real server options */
525 unsigned conn_flags; /* connection flags */
526 int weight; /* destination weight */
528 /* thresholds for active connections */
529 u32 u_threshold; /* upper threshold */
530 u32 l_threshold; /* lower threshold */
535 * The information about the virtual service offered to the net
536 * and the forwarding entries
538 struct ip_vs_service {
539 struct list_head s_list; /* for normal service table */
540 struct list_head f_list; /* for fwmark-based service table */
541 atomic_t refcnt; /* reference counter */
542 atomic_t usecnt; /* use counter */
544 u16 af; /* address family */
545 __u16 protocol; /* which protocol (TCP/UDP) */
546 union nf_inet_addr addr; /* IP address for virtual service */
547 __be16 port; /* port number for the service */
548 __u32 fwmark; /* firewall mark of the service */
549 unsigned flags; /* service status flags */
550 unsigned timeout; /* persistent timeout in ticks */
551 __be32 netmask; /* grouping granularity */
554 struct list_head destinations; /* real server d-linked list */
555 __u32 num_dests; /* number of servers */
556 struct ip_vs_stats stats; /* statistics for the service */
557 struct ip_vs_app *inc; /* bind conns to this app inc */
560 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
561 rwlock_t sched_lock; /* lock sched_data */
562 void *sched_data; /* scheduler application data */
564 /* alternate persistence engine */
570 * The real server destination forwarding entry
571 * with ip address, port number, and so on.
574 struct list_head n_list; /* for the dests in the service */
575 struct list_head d_list; /* for table with all the dests */
577 u16 af; /* address family */
578 union nf_inet_addr addr; /* IP address of the server */
579 __be16 port; /* port number of the server */
580 volatile unsigned flags; /* dest status flags */
581 atomic_t conn_flags; /* flags to copy to conn */
582 atomic_t weight; /* server weight */
584 atomic_t refcnt; /* reference counter */
585 struct ip_vs_stats stats; /* statistics */
587 /* connection counters and thresholds */
588 atomic_t activeconns; /* active connections */
589 atomic_t inactconns; /* inactive connections */
590 atomic_t persistconns; /* persistent connections */
591 __u32 u_threshold; /* upper threshold */
592 __u32 l_threshold; /* lower threshold */
594 /* for destination cache */
595 spinlock_t dst_lock; /* lock of dst_cache */
596 struct dst_entry *dst_cache; /* destination cache entry */
597 u32 dst_rtos; /* RT_TOS(tos) for dst */
599 #ifdef CONFIG_IP_VS_IPV6
600 struct in6_addr dst_saddr;
603 /* for virtual service */
604 struct ip_vs_service *svc; /* service it belongs to */
605 __u16 protocol; /* which protocol (TCP/UDP) */
606 union nf_inet_addr vaddr; /* virtual IP address */
607 __be16 vport; /* virtual port number */
608 __u32 vfwmark; /* firewall mark of service */
613 * The scheduler object
615 struct ip_vs_scheduler {
616 struct list_head n_list; /* d-linked list head */
617 char *name; /* scheduler name */
618 atomic_t refcnt; /* reference counter */
619 struct module *module; /* THIS_MODULE/NULL */
621 /* scheduler initializing service */
622 int (*init_service)(struct ip_vs_service *svc);
623 /* scheduling service finish */
624 int (*done_service)(struct ip_vs_service *svc);
625 /* scheduler updating service */
626 int (*update_service)(struct ip_vs_service *svc);
628 /* selecting a server from the given service */
629 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
630 const struct sk_buff *skb);
633 /* The persistence engine object */
635 struct list_head n_list; /* d-linked list head */
636 char *name; /* scheduler name */
637 atomic_t refcnt; /* reference counter */
638 struct module *module; /* THIS_MODULE/NULL */
640 /* get the connection template, if any */
641 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
642 bool (*ct_match)(const struct ip_vs_conn_param *p,
643 struct ip_vs_conn *ct);
644 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
646 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
650 * The application module object (a.k.a. app incarnation)
653 struct list_head a_list; /* member in app list */
654 int type; /* IP_VS_APP_TYPE_xxx */
655 char *name; /* application module name */
657 struct module *module; /* THIS_MODULE/NULL */
658 struct list_head incs_list; /* list of incarnations */
660 /* members for application incarnations */
661 struct list_head p_list; /* member in proto app list */
662 struct ip_vs_app *app; /* its real application */
663 __be16 port; /* port number in net order */
664 atomic_t usecnt; /* usage counter */
667 * output hook: Process packet in inout direction, diff set for TCP.
668 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
669 * 2=Mangled but checksum was not updated
671 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
672 struct sk_buff *, int *diff);
675 * input hook: Process packet in outin direction, diff set for TCP.
676 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
677 * 2=Mangled but checksum was not updated
679 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
680 struct sk_buff *, int *diff);
682 /* ip_vs_app initializer */
683 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
685 /* ip_vs_app finish */
686 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
690 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
691 struct ip_vs_protocol *);
693 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
699 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
700 int *verdict, struct ip_vs_conn **cpp);
703 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
704 const struct iphdr *iph, unsigned int proto_off,
708 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
709 const struct iphdr *iph, unsigned int proto_off,
712 int (*state_transition)(struct ip_vs_conn *cp, int direction,
713 const struct sk_buff *skb,
714 struct ip_vs_app *app);
716 void (*timeout_change)(struct ip_vs_app *app, int flags);
721 * IPVS core functions
722 * (from ip_vs_core.c)
724 extern const char *ip_vs_proto_name(unsigned proto);
725 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
726 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
728 #define IP_VS_APP_TYPE_FTP 1
731 * ip_vs_conn handling functions
732 * (from ip_vs_conn.c)
738 IP_VS_DIR_INPUT_ONLY,
742 static inline void ip_vs_conn_fill_param(int af, int protocol,
743 const union nf_inet_addr *caddr,
745 const union nf_inet_addr *vaddr,
747 struct ip_vs_conn_param *p)
750 p->protocol = protocol;
759 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
760 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
762 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
763 struct ip_vs_protocol *pp,
764 const struct ip_vs_iphdr *iph,
765 unsigned int proto_off,
768 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
770 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
771 struct ip_vs_protocol *pp,
772 const struct ip_vs_iphdr *iph,
773 unsigned int proto_off,
776 /* put back the conn without restarting its timer */
777 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
779 atomic_dec(&cp->refcnt);
781 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
782 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
784 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
785 const union nf_inet_addr *daddr,
786 __be16 dport, unsigned flags,
787 struct ip_vs_dest *dest, __u32 fwmark);
788 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
790 extern const char * ip_vs_state_name(__u16 proto, int state);
792 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
793 extern int ip_vs_check_template(struct ip_vs_conn *ct);
794 extern void ip_vs_random_dropentry(void);
795 extern int ip_vs_conn_init(void);
796 extern void ip_vs_conn_cleanup(void);
798 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
800 struct ip_vs_conn *ctl_cp = cp->control;
802 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
804 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
806 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
812 IP_VS_DBG_BUF(7, "DELeting control for: "
813 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
814 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
816 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
817 ntohs(ctl_cp->cport));
820 if (atomic_read(&ctl_cp->n_control) == 0) {
821 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
823 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
825 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
830 atomic_dec(&ctl_cp->n_control);
834 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
837 IP_VS_ERR_BUF("request control ADD for already controlled: "
839 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
841 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
844 ip_vs_control_del(cp);
847 IP_VS_DBG_BUF(7, "ADDing control for: "
848 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
849 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
851 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
852 ntohs(ctl_cp->cport));
854 cp->control = ctl_cp;
855 atomic_inc(&ctl_cp->n_control);
860 * IPVS application functions
863 #define IP_VS_APP_MAX_PORTS 8
864 extern int register_ip_vs_app(struct ip_vs_app *app);
865 extern void unregister_ip_vs_app(struct ip_vs_app *app);
866 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
867 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
869 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
870 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
871 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
873 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
874 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
875 extern int ip_vs_app_init(void);
876 extern void ip_vs_app_cleanup(void);
878 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
879 void ip_vs_unbind_pe(struct ip_vs_service *svc);
880 int register_ip_vs_pe(struct ip_vs_pe *pe);
881 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
882 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
883 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
885 static inline void ip_vs_pe_get(const struct ip_vs_pe *pe)
887 if (pe && pe->module)
888 __module_get(pe->module);
891 static inline void ip_vs_pe_put(const struct ip_vs_pe *pe)
893 if (pe && pe->module)
894 module_put(pe->module);
898 * IPVS protocol functions (from ip_vs_proto.c)
900 extern int ip_vs_protocol_init(void);
901 extern void ip_vs_protocol_cleanup(void);
902 extern void ip_vs_protocol_timeout_change(int flags);
903 extern int *ip_vs_create_timeout_table(int *table, int size);
905 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
906 const char *name, int to);
908 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
909 const struct sk_buff *skb,
910 int offset, const char *msg);
912 extern struct ip_vs_protocol ip_vs_protocol_tcp;
913 extern struct ip_vs_protocol ip_vs_protocol_udp;
914 extern struct ip_vs_protocol ip_vs_protocol_icmp;
915 extern struct ip_vs_protocol ip_vs_protocol_esp;
916 extern struct ip_vs_protocol ip_vs_protocol_ah;
917 extern struct ip_vs_protocol ip_vs_protocol_sctp;
920 * Registering/unregistering scheduler functions
921 * (from ip_vs_sched.c)
923 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
924 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
925 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
926 struct ip_vs_scheduler *scheduler);
927 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
928 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
929 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
930 extern struct ip_vs_conn *
931 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
932 struct ip_vs_protocol *pp, int *ignored);
933 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
934 struct ip_vs_protocol *pp);
938 * IPVS control data and functions (from ip_vs_ctl.c)
940 extern int sysctl_ip_vs_cache_bypass;
941 extern int sysctl_ip_vs_expire_nodest_conn;
942 extern int sysctl_ip_vs_expire_quiescent_template;
943 extern int sysctl_ip_vs_sync_threshold[2];
944 extern int sysctl_ip_vs_nat_icmp_send;
945 extern int sysctl_ip_vs_conntrack;
946 extern int sysctl_ip_vs_snat_reroute;
947 extern struct ip_vs_stats ip_vs_stats;
948 extern const struct ctl_path net_vs_ctl_path[];
949 extern int sysctl_ip_vs_sync_ver;
951 extern void ip_vs_sync_switch_mode(int mode);
952 extern struct ip_vs_service *
953 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
954 const union nf_inet_addr *vaddr, __be16 vport);
956 static inline void ip_vs_service_put(struct ip_vs_service *svc)
958 atomic_dec(&svc->usecnt);
961 extern struct ip_vs_dest *
962 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
963 const union nf_inet_addr *daddr, __be16 dport);
965 extern int ip_vs_use_count_inc(void);
966 extern void ip_vs_use_count_dec(void);
967 extern int ip_vs_control_init(void);
968 extern void ip_vs_control_cleanup(void);
969 extern struct ip_vs_dest *
970 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
971 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
972 __u16 protocol, __u32 fwmark);
973 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
977 * IPVS sync daemon data and function prototypes
978 * (from ip_vs_sync.c)
980 extern volatile int ip_vs_sync_state;
981 extern volatile int ip_vs_master_syncid;
982 extern volatile int ip_vs_backup_syncid;
983 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
984 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
985 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
986 extern int stop_sync_thread(int state);
987 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
988 extern int ip_vs_sync_init(void);
989 extern void ip_vs_sync_cleanup(void);
993 * IPVS rate estimator prototypes (from ip_vs_est.c)
995 extern int ip_vs_estimator_init(void);
996 extern void ip_vs_estimator_cleanup(void);
997 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
998 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
999 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1002 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1004 extern int ip_vs_null_xmit
1005 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1006 extern int ip_vs_bypass_xmit
1007 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1008 extern int ip_vs_nat_xmit
1009 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1010 extern int ip_vs_tunnel_xmit
1011 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1012 extern int ip_vs_dr_xmit
1013 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1014 extern int ip_vs_icmp_xmit
1015 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
1016 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1018 #ifdef CONFIG_IP_VS_IPV6
1019 extern int ip_vs_bypass_xmit_v6
1020 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1021 extern int ip_vs_nat_xmit_v6
1022 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1023 extern int ip_vs_tunnel_xmit_v6
1024 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1025 extern int ip_vs_dr_xmit_v6
1026 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1027 extern int ip_vs_icmp_xmit_v6
1028 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1033 * This is a simple mechanism to ignore packets when
1034 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1035 * we start to drop 1/rate of the packets
1037 extern int ip_vs_drop_rate;
1038 extern int ip_vs_drop_counter;
1040 static __inline__ int ip_vs_todrop(void)
1042 if (!ip_vs_drop_rate) return 0;
1043 if (--ip_vs_drop_counter > 0) return 0;
1044 ip_vs_drop_counter = ip_vs_drop_rate;
1049 * ip_vs_fwd_tag returns the forwarding tag of the connection
1051 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1053 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1057 switch (IP_VS_FWD_METHOD(cp)) {
1058 case IP_VS_CONN_F_MASQ:
1060 case IP_VS_CONN_F_LOCALNODE:
1062 case IP_VS_CONN_F_TUNNEL:
1064 case IP_VS_CONN_F_DROUTE:
1066 case IP_VS_CONN_F_BYPASS:
1074 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1075 struct ip_vs_conn *cp, int dir);
1077 #ifdef CONFIG_IP_VS_IPV6
1078 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1079 struct ip_vs_conn *cp, int dir);
1082 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1084 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1086 __be32 diff[2] = { ~old, new };
1088 return csum_partial(diff, sizeof(diff), oldsum);
1091 #ifdef CONFIG_IP_VS_IPV6
1092 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1095 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1096 new[3], new[2], new[1], new[0] };
1098 return csum_partial(diff, sizeof(diff), oldsum);
1102 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1104 __be16 diff[2] = { ~old, new };
1106 return csum_partial(diff, sizeof(diff), oldsum);
1110 * Forget current conntrack (unconfirmed) and attach notrack entry
1112 static inline void ip_vs_notrack(struct sk_buff *skb)
1114 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1115 enum ip_conntrack_info ctinfo;
1116 struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
1118 if (!ct || !nf_ct_is_untracked(ct)) {
1120 skb->nfct = &nf_ct_untracked_get()->ct_general;
1121 skb->nfctinfo = IP_CT_NEW;
1122 nf_conntrack_get(skb->nfct);
1127 #ifdef CONFIG_IP_VS_NFCT
1129 * Netfilter connection tracking
1130 * (from ip_vs_nfct.c)
1132 static inline int ip_vs_conntrack_enabled(void)
1134 return sysctl_ip_vs_conntrack;
1137 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1139 extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1140 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1141 struct ip_vs_conn *cp, u_int8_t proto,
1142 const __be16 port, int from_rs);
1143 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1147 static inline int ip_vs_conntrack_enabled(void)
1152 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1153 struct ip_vs_conn *cp, int outin)
1157 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1158 struct ip_vs_conn *cp)
1163 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1166 /* CONFIG_IP_VS_NFCT */
1169 #endif /* __KERNEL__ */
1171 #endif /* _NET_IP_VS_H */