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 * This one needed for single_open_net since net is stored directly in
95 * private not as a struct i.e. seq_file_net cant be used.
97 static inline struct net *seq_file_single_net(struct seq_file *seq)
100 return (struct net *)seq->private;
106 /* Connections' size value needed by ip_vs_ctl.c */
107 extern int ip_vs_conn_tab_size;
113 union nf_inet_addr saddr;
114 union nf_inet_addr daddr;
118 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
120 #ifdef CONFIG_IP_VS_IPV6
121 if (af == AF_INET6) {
122 const struct ipv6hdr *iph = nh;
123 iphdr->len = sizeof(struct ipv6hdr);
124 iphdr->protocol = iph->nexthdr;
125 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
126 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
130 const struct iphdr *iph = nh;
131 iphdr->len = iph->ihl * 4;
132 iphdr->protocol = iph->protocol;
133 iphdr->saddr.ip = iph->saddr;
134 iphdr->daddr.ip = iph->daddr;
138 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
139 const union nf_inet_addr *src)
141 #ifdef CONFIG_IP_VS_IPV6
143 ipv6_addr_copy(&dst->in6, &src->in6);
149 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
150 const union nf_inet_addr *b)
152 #ifdef CONFIG_IP_VS_IPV6
154 return ipv6_addr_equal(&a->in6, &b->in6);
156 return a->ip == b->ip;
159 #ifdef CONFIG_IP_VS_DEBUG
160 #include <linux/net.h>
162 extern int ip_vs_get_debug_level(void);
164 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
165 const union nf_inet_addr *addr,
169 #ifdef CONFIG_IP_VS_IPV6
171 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
175 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
179 BUG_ON(*idx > buf_len + 1);
180 return &buf[*idx - len];
183 #define IP_VS_DBG_BUF(level, msg, ...) \
185 char ip_vs_dbg_buf[160]; \
186 int ip_vs_dbg_idx = 0; \
187 if (level <= ip_vs_get_debug_level()) \
188 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
190 #define IP_VS_ERR_BUF(msg...) \
192 char ip_vs_dbg_buf[160]; \
193 int ip_vs_dbg_idx = 0; \
197 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
198 #define IP_VS_DBG_ADDR(af, addr) \
199 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
200 sizeof(ip_vs_dbg_buf), addr, \
203 #define IP_VS_DBG(level, msg, ...) \
205 if (level <= ip_vs_get_debug_level()) \
206 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
208 #define IP_VS_DBG_RL(msg, ...) \
210 if (net_ratelimit()) \
211 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
213 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
215 if (level <= ip_vs_get_debug_level()) \
216 pp->debug_packet(af, pp, skb, ofs, msg); \
218 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
220 if (level <= ip_vs_get_debug_level() && \
222 pp->debug_packet(af, pp, skb, ofs, msg); \
224 #else /* NO DEBUGGING at ALL */
225 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
226 #define IP_VS_ERR_BUF(msg...) do {} while (0)
227 #define IP_VS_DBG(level, msg...) do {} while (0)
228 #define IP_VS_DBG_RL(msg...) do {} while (0)
229 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
230 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
233 #define IP_VS_BUG() BUG()
234 #define IP_VS_ERR_RL(msg, ...) \
236 if (net_ratelimit()) \
237 pr_err(msg, ##__VA_ARGS__); \
240 #ifdef CONFIG_IP_VS_DEBUG
241 #define EnterFunction(level) \
243 if (level <= ip_vs_get_debug_level()) \
245 pr_fmt("Enter: %s, %s line %i\n"), \
246 __func__, __FILE__, __LINE__); \
248 #define LeaveFunction(level) \
250 if (level <= ip_vs_get_debug_level()) \
252 pr_fmt("Leave: %s, %s line %i\n"), \
253 __func__, __FILE__, __LINE__); \
256 #define EnterFunction(level) do {} while (0)
257 #define LeaveFunction(level) do {} while (0)
260 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
264 * The port number of FTP service (in network order).
266 #define FTPPORT cpu_to_be16(21)
267 #define FTPDATA cpu_to_be16(20)
273 IP_VS_TCP_S_NONE = 0,
274 IP_VS_TCP_S_ESTABLISHED,
275 IP_VS_TCP_S_SYN_SENT,
276 IP_VS_TCP_S_SYN_RECV,
277 IP_VS_TCP_S_FIN_WAIT,
278 IP_VS_TCP_S_TIME_WAIT,
280 IP_VS_TCP_S_CLOSE_WAIT,
281 IP_VS_TCP_S_LAST_ACK,
306 enum ip_vs_sctp_states {
308 IP_VS_SCTP_S_INIT_CLI,
309 IP_VS_SCTP_S_INIT_SER,
310 IP_VS_SCTP_S_INIT_ACK_CLI,
311 IP_VS_SCTP_S_INIT_ACK_SER,
312 IP_VS_SCTP_S_ECHO_CLI,
313 IP_VS_SCTP_S_ECHO_SER,
314 IP_VS_SCTP_S_ESTABLISHED,
315 IP_VS_SCTP_S_SHUT_CLI,
316 IP_VS_SCTP_S_SHUT_SER,
317 IP_VS_SCTP_S_SHUT_ACK_CLI,
318 IP_VS_SCTP_S_SHUT_ACK_SER,
324 * Delta sequence info structure
325 * Each ip_vs_conn has 2 (output AND input seq. changes).
326 * Only used in the VS/NAT.
329 __u32 init_seq; /* Add delta from this seq */
330 __u32 delta; /* Delta in sequence numbers */
331 __u32 previous_delta; /* Delta in sequence numbers
332 before last resized pkt */
338 struct ip_vs_counters {
339 __u32 conns; /* connections scheduled */
340 __u32 inpkts; /* incoming packets */
341 __u32 outpkts; /* outgoing packets */
342 __u64 inbytes; /* incoming bytes */
343 __u64 outbytes; /* outgoing bytes */
348 struct ip_vs_cpu_stats {
349 struct ip_vs_counters ustats;
350 struct u64_stats_sync syncp;
354 * IPVS statistics objects
356 struct ip_vs_estimator {
357 struct list_head list;
373 struct ip_vs_stats_user ustats; /* statistics */
374 struct ip_vs_estimator est; /* estimator */
375 struct ip_vs_cpu_stats *cpustats; /* per cpu counters */
376 spinlock_t lock; /* spin lock */
380 * Helper Macros for per cpu
381 * ipvs->tot_stats->ustats.count
383 #define IPVS_STAT_INC(ipvs, count) \
384 __this_cpu_inc((ipvs)->ustats->count)
386 #define IPVS_STAT_ADD(ipvs, count, value) \
388 write_seqcount_begin(per_cpu_ptr((ipvs)->ustats_seq, \
389 raw_smp_processor_id())); \
390 __this_cpu_add((ipvs)->ustats->count, value); \
391 write_seqcount_end(per_cpu_ptr((ipvs)->ustats_seq, \
392 raw_smp_processor_id())); \
400 struct ip_vs_proto_data;
402 struct ip_vs_protocol {
403 struct ip_vs_protocol *next;
409 void (*init)(struct ip_vs_protocol *pp);
411 void (*exit)(struct ip_vs_protocol *pp);
413 void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
415 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
417 int (*conn_schedule)(int af, struct sk_buff *skb,
418 struct ip_vs_proto_data *pd,
419 int *verdict, struct ip_vs_conn **cpp);
422 (*conn_in_get)(int af,
423 const struct sk_buff *skb,
424 const struct ip_vs_iphdr *iph,
425 unsigned int proto_off,
429 (*conn_out_get)(int af,
430 const struct sk_buff *skb,
431 const struct ip_vs_iphdr *iph,
432 unsigned int proto_off,
435 int (*snat_handler)(struct sk_buff *skb,
436 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
438 int (*dnat_handler)(struct sk_buff *skb,
439 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
441 int (*csum_check)(int af, struct sk_buff *skb,
442 struct ip_vs_protocol *pp);
444 const char *(*state_name)(int state);
446 int (*state_transition)(struct ip_vs_conn *cp, int direction,
447 const struct sk_buff *skb,
448 struct ip_vs_proto_data *pd);
450 int (*register_app)(struct net *net, struct ip_vs_app *inc);
452 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
454 int (*app_conn_bind)(struct ip_vs_conn *cp);
456 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
457 const struct sk_buff *skb,
461 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
465 * protocol data per netns
467 struct ip_vs_proto_data {
468 struct ip_vs_proto_data *next;
469 struct ip_vs_protocol *pp;
470 int *timeout_table; /* protocol timeout table */
471 atomic_t appcnt; /* counter of proto app incs. */
472 struct tcp_states_t *tcp_state_table;
475 extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
476 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
477 unsigned short proto);
479 struct ip_vs_conn_param {
481 const union nf_inet_addr *caddr;
482 const union nf_inet_addr *vaddr;
488 const struct ip_vs_pe *pe;
494 * IP_VS structure allocated for each dynamically scheduled connection
497 struct list_head c_list; /* hashed list heads */
499 struct net *net; /* Name space */
501 /* Protocol, addresses and port numbers */
502 u16 af; /* address family */
506 __u32 fwmark; /* Fire wall mark from skb */
507 union nf_inet_addr caddr; /* client address */
508 union nf_inet_addr vaddr; /* virtual address */
509 union nf_inet_addr daddr; /* destination address */
510 volatile __u32 flags; /* status flags */
511 __u16 protocol; /* Which protocol (TCP/UDP) */
513 /* counter and timer */
514 atomic_t refcnt; /* reference count */
515 struct timer_list timer; /* Expiration timer */
516 volatile unsigned long timeout; /* timeout */
518 /* Flags and state transition */
519 spinlock_t lock; /* lock for state transition */
520 volatile __u16 state; /* state info */
521 volatile __u16 old_state; /* old state, to be used for
522 * state transition triggerd
526 /* Control members */
527 struct ip_vs_conn *control; /* Master control connection */
528 atomic_t n_control; /* Number of controlled ones */
529 struct ip_vs_dest *dest; /* real server */
530 atomic_t in_pkts; /* incoming packet counter */
532 /* packet transmitter for different forwarding methods. If it
533 mangles the packet, it must return NF_DROP or better NF_STOLEN,
534 otherwise this must be changed to a sk_buff **.
535 NF_ACCEPT can be returned when destination is local.
537 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
538 struct ip_vs_protocol *pp);
540 /* Note: we can group the following members into a structure,
541 in order to save more space, and the following members are
542 only used in VS/NAT anyway */
543 struct ip_vs_app *app; /* bound ip_vs_app object */
544 void *app_data; /* Application private data */
545 struct ip_vs_seq in_seq; /* incoming seq. struct */
546 struct ip_vs_seq out_seq; /* outgoing seq. struct */
548 const struct ip_vs_pe *pe;
554 * To save some memory in conn table when name space is disabled.
556 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
564 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
571 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
575 return cp->net == net;
582 * Extended internal versions of struct ip_vs_service_user and
583 * ip_vs_dest_user for IPv6 support.
585 * We need these to conveniently pass around service and destination
586 * options, but unfortunately, we also need to keep the old definitions to
587 * maintain userspace backwards compatibility for the setsockopt interface.
589 struct ip_vs_service_user_kern {
590 /* virtual service addresses */
593 union nf_inet_addr addr; /* virtual ip address */
595 u32 fwmark; /* firwall mark of service */
597 /* virtual service options */
600 unsigned flags; /* virtual service flags */
601 unsigned timeout; /* persistent timeout in sec */
602 u32 netmask; /* persistent netmask */
606 struct ip_vs_dest_user_kern {
607 /* destination server address */
608 union nf_inet_addr addr;
611 /* real server options */
612 unsigned conn_flags; /* connection flags */
613 int weight; /* destination weight */
615 /* thresholds for active connections */
616 u32 u_threshold; /* upper threshold */
617 u32 l_threshold; /* lower threshold */
622 * The information about the virtual service offered to the net
623 * and the forwarding entries
625 struct ip_vs_service {
626 struct list_head s_list; /* for normal service table */
627 struct list_head f_list; /* for fwmark-based service table */
628 atomic_t refcnt; /* reference counter */
629 atomic_t usecnt; /* use counter */
631 u16 af; /* address family */
632 __u16 protocol; /* which protocol (TCP/UDP) */
633 union nf_inet_addr addr; /* IP address for virtual service */
634 __be16 port; /* port number for the service */
635 __u32 fwmark; /* firewall mark of the service */
636 unsigned flags; /* service status flags */
637 unsigned timeout; /* persistent timeout in ticks */
638 __be32 netmask; /* grouping granularity */
641 struct list_head destinations; /* real server d-linked list */
642 __u32 num_dests; /* number of servers */
643 struct ip_vs_stats stats; /* statistics for the service */
644 struct ip_vs_app *inc; /* bind conns to this app inc */
647 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
648 rwlock_t sched_lock; /* lock sched_data */
649 void *sched_data; /* scheduler application data */
651 /* alternate persistence engine */
657 * The real server destination forwarding entry
658 * with ip address, port number, and so on.
661 struct list_head n_list; /* for the dests in the service */
662 struct list_head d_list; /* for table with all the dests */
664 u16 af; /* address family */
665 union nf_inet_addr addr; /* IP address of the server */
666 __be16 port; /* port number of the server */
667 volatile unsigned flags; /* dest status flags */
668 atomic_t conn_flags; /* flags to copy to conn */
669 atomic_t weight; /* server weight */
671 atomic_t refcnt; /* reference counter */
672 struct ip_vs_stats stats; /* statistics */
674 /* connection counters and thresholds */
675 atomic_t activeconns; /* active connections */
676 atomic_t inactconns; /* inactive connections */
677 atomic_t persistconns; /* persistent connections */
678 __u32 u_threshold; /* upper threshold */
679 __u32 l_threshold; /* lower threshold */
681 /* for destination cache */
682 spinlock_t dst_lock; /* lock of dst_cache */
683 struct dst_entry *dst_cache; /* destination cache entry */
684 u32 dst_rtos; /* RT_TOS(tos) for dst */
686 #ifdef CONFIG_IP_VS_IPV6
687 struct in6_addr dst_saddr;
690 /* for virtual service */
691 struct ip_vs_service *svc; /* service it belongs to */
692 __u16 protocol; /* which protocol (TCP/UDP) */
693 union nf_inet_addr vaddr; /* virtual IP address */
694 __be16 vport; /* virtual port number */
695 __u32 vfwmark; /* firewall mark of service */
700 * The scheduler object
702 struct ip_vs_scheduler {
703 struct list_head n_list; /* d-linked list head */
704 char *name; /* scheduler name */
705 atomic_t refcnt; /* reference counter */
706 struct module *module; /* THIS_MODULE/NULL */
708 /* scheduler initializing service */
709 int (*init_service)(struct ip_vs_service *svc);
710 /* scheduling service finish */
711 int (*done_service)(struct ip_vs_service *svc);
712 /* scheduler updating service */
713 int (*update_service)(struct ip_vs_service *svc);
715 /* selecting a server from the given service */
716 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
717 const struct sk_buff *skb);
720 /* The persistence engine object */
722 struct list_head n_list; /* d-linked list head */
723 char *name; /* scheduler name */
724 atomic_t refcnt; /* reference counter */
725 struct module *module; /* THIS_MODULE/NULL */
727 /* get the connection template, if any */
728 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
729 bool (*ct_match)(const struct ip_vs_conn_param *p,
730 struct ip_vs_conn *ct);
731 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
733 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
737 * The application module object (a.k.a. app incarnation)
740 struct list_head a_list; /* member in app list */
741 int type; /* IP_VS_APP_TYPE_xxx */
742 char *name; /* application module name */
744 struct module *module; /* THIS_MODULE/NULL */
745 struct list_head incs_list; /* list of incarnations */
747 /* members for application incarnations */
748 struct list_head p_list; /* member in proto app list */
749 struct ip_vs_app *app; /* its real application */
750 __be16 port; /* port number in net order */
751 atomic_t usecnt; /* usage counter */
754 * output hook: Process packet in inout direction, diff set for TCP.
755 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
756 * 2=Mangled but checksum was not updated
758 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
759 struct sk_buff *, int *diff);
762 * input hook: Process packet in outin direction, diff set for TCP.
763 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
764 * 2=Mangled but checksum was not updated
766 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
767 struct sk_buff *, int *diff);
769 /* ip_vs_app initializer */
770 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
772 /* ip_vs_app finish */
773 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
777 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
778 struct ip_vs_protocol *);
780 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
786 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
787 int *verdict, struct ip_vs_conn **cpp);
790 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
791 const struct iphdr *iph, unsigned int proto_off,
795 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
796 const struct iphdr *iph, unsigned int proto_off,
799 int (*state_transition)(struct ip_vs_conn *cp, int direction,
800 const struct sk_buff *skb,
801 struct ip_vs_app *app);
803 void (*timeout_change)(struct ip_vs_app *app, int flags);
808 * IPVS core functions
809 * (from ip_vs_core.c)
811 extern const char *ip_vs_proto_name(unsigned proto);
812 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
813 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
815 #define IP_VS_APP_TYPE_FTP 1
818 * ip_vs_conn handling functions
819 * (from ip_vs_conn.c)
825 IP_VS_DIR_INPUT_ONLY,
829 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
830 const union nf_inet_addr *caddr,
832 const union nf_inet_addr *vaddr,
834 struct ip_vs_conn_param *p)
838 p->protocol = protocol;
847 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
848 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
850 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
851 const struct ip_vs_iphdr *iph,
852 unsigned int proto_off,
855 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
857 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
858 const struct ip_vs_iphdr *iph,
859 unsigned int proto_off,
862 /* put back the conn without restarting its timer */
863 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
865 atomic_dec(&cp->refcnt);
867 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
868 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
870 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
871 const union nf_inet_addr *daddr,
872 __be16 dport, unsigned flags,
873 struct ip_vs_dest *dest, __u32 fwmark);
874 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
876 extern const char * ip_vs_state_name(__u16 proto, int state);
878 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
879 extern int ip_vs_check_template(struct ip_vs_conn *ct);
880 extern void ip_vs_random_dropentry(void);
881 extern int ip_vs_conn_init(void);
882 extern void ip_vs_conn_cleanup(void);
884 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
886 struct ip_vs_conn *ctl_cp = cp->control;
888 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
890 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
892 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
898 IP_VS_DBG_BUF(7, "DELeting control for: "
899 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
900 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
902 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
903 ntohs(ctl_cp->cport));
906 if (atomic_read(&ctl_cp->n_control) == 0) {
907 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
909 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
911 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
916 atomic_dec(&ctl_cp->n_control);
920 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
923 IP_VS_ERR_BUF("request control ADD for already controlled: "
925 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
927 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
930 ip_vs_control_del(cp);
933 IP_VS_DBG_BUF(7, "ADDing control for: "
934 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
935 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
937 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
938 ntohs(ctl_cp->cport));
940 cp->control = ctl_cp;
941 atomic_inc(&ctl_cp->n_control);
946 * IPVS application functions
949 #define IP_VS_APP_MAX_PORTS 8
950 extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
951 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
952 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
953 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
954 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
955 __u16 proto, __u16 port);
956 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
957 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
959 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
960 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
961 extern int ip_vs_app_init(void);
962 extern void ip_vs_app_cleanup(void);
964 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
965 void ip_vs_unbind_pe(struct ip_vs_service *svc);
966 int register_ip_vs_pe(struct ip_vs_pe *pe);
967 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
968 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
969 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
971 static inline void ip_vs_pe_get(const struct ip_vs_pe *pe)
973 if (pe && pe->module)
974 __module_get(pe->module);
977 static inline void ip_vs_pe_put(const struct ip_vs_pe *pe)
979 if (pe && pe->module)
980 module_put(pe->module);
984 * IPVS protocol functions (from ip_vs_proto.c)
986 extern int ip_vs_protocol_init(void);
987 extern void ip_vs_protocol_cleanup(void);
988 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
989 extern int *ip_vs_create_timeout_table(int *table, int size);
991 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
992 const char *name, int to);
994 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
995 const struct sk_buff *skb,
996 int offset, const char *msg);
998 extern struct ip_vs_protocol ip_vs_protocol_tcp;
999 extern struct ip_vs_protocol ip_vs_protocol_udp;
1000 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1001 extern struct ip_vs_protocol ip_vs_protocol_esp;
1002 extern struct ip_vs_protocol ip_vs_protocol_ah;
1003 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1006 * Registering/unregistering scheduler functions
1007 * (from ip_vs_sched.c)
1009 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1010 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1011 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1012 struct ip_vs_scheduler *scheduler);
1013 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1014 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1015 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1016 extern struct ip_vs_conn *
1017 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1018 struct ip_vs_proto_data *pd, int *ignored);
1019 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1020 struct ip_vs_proto_data *pd);
1024 * IPVS control data and functions (from ip_vs_ctl.c)
1026 extern int sysctl_ip_vs_cache_bypass;
1027 extern int sysctl_ip_vs_expire_nodest_conn;
1028 extern int sysctl_ip_vs_expire_quiescent_template;
1029 extern int sysctl_ip_vs_sync_threshold[2];
1030 extern int sysctl_ip_vs_nat_icmp_send;
1031 extern int sysctl_ip_vs_conntrack;
1032 extern int sysctl_ip_vs_snat_reroute;
1033 extern struct ip_vs_stats ip_vs_stats;
1034 extern const struct ctl_path net_vs_ctl_path[];
1035 extern int sysctl_ip_vs_sync_ver;
1037 extern void ip_vs_sync_switch_mode(struct net *net, int mode);
1038 extern struct ip_vs_service *
1039 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1040 const union nf_inet_addr *vaddr, __be16 vport);
1042 static inline void ip_vs_service_put(struct ip_vs_service *svc)
1044 atomic_dec(&svc->usecnt);
1047 extern struct ip_vs_dest *
1048 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1049 const union nf_inet_addr *daddr, __be16 dport);
1051 extern int ip_vs_use_count_inc(void);
1052 extern void ip_vs_use_count_dec(void);
1053 extern int ip_vs_control_init(void);
1054 extern void ip_vs_control_cleanup(void);
1055 extern struct ip_vs_dest *
1056 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1057 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1058 __u16 protocol, __u32 fwmark);
1059 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1063 * IPVS sync daemon data and function prototypes
1064 * (from ip_vs_sync.c)
1066 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1068 extern int stop_sync_thread(struct net *net, int state);
1069 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp);
1070 extern int ip_vs_sync_init(void);
1071 extern void ip_vs_sync_cleanup(void);
1075 * IPVS rate estimator prototypes (from ip_vs_est.c)
1077 extern int ip_vs_estimator_init(void);
1078 extern void ip_vs_estimator_cleanup(void);
1079 extern void ip_vs_new_estimator(struct net *net, struct ip_vs_stats *stats);
1080 extern void ip_vs_kill_estimator(struct net *net, struct ip_vs_stats *stats);
1081 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1084 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1086 extern int ip_vs_null_xmit
1087 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1088 extern int ip_vs_bypass_xmit
1089 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1090 extern int ip_vs_nat_xmit
1091 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1092 extern int ip_vs_tunnel_xmit
1093 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1094 extern int ip_vs_dr_xmit
1095 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1096 extern int ip_vs_icmp_xmit
1097 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
1098 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1100 #ifdef CONFIG_IP_VS_IPV6
1101 extern int ip_vs_bypass_xmit_v6
1102 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1103 extern int ip_vs_nat_xmit_v6
1104 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1105 extern int ip_vs_tunnel_xmit_v6
1106 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1107 extern int ip_vs_dr_xmit_v6
1108 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1109 extern int ip_vs_icmp_xmit_v6
1110 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1115 * This is a simple mechanism to ignore packets when
1116 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1117 * we start to drop 1/rate of the packets
1119 extern int ip_vs_drop_rate;
1120 extern int ip_vs_drop_counter;
1122 static __inline__ int ip_vs_todrop(void)
1124 if (!ip_vs_drop_rate) return 0;
1125 if (--ip_vs_drop_counter > 0) return 0;
1126 ip_vs_drop_counter = ip_vs_drop_rate;
1131 * ip_vs_fwd_tag returns the forwarding tag of the connection
1133 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1135 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1139 switch (IP_VS_FWD_METHOD(cp)) {
1140 case IP_VS_CONN_F_MASQ:
1142 case IP_VS_CONN_F_LOCALNODE:
1144 case IP_VS_CONN_F_TUNNEL:
1146 case IP_VS_CONN_F_DROUTE:
1148 case IP_VS_CONN_F_BYPASS:
1156 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1157 struct ip_vs_conn *cp, int dir);
1159 #ifdef CONFIG_IP_VS_IPV6
1160 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1161 struct ip_vs_conn *cp, int dir);
1164 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1166 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1168 __be32 diff[2] = { ~old, new };
1170 return csum_partial(diff, sizeof(diff), oldsum);
1173 #ifdef CONFIG_IP_VS_IPV6
1174 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1177 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1178 new[3], new[2], new[1], new[0] };
1180 return csum_partial(diff, sizeof(diff), oldsum);
1184 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1186 __be16 diff[2] = { ~old, new };
1188 return csum_partial(diff, sizeof(diff), oldsum);
1192 * Forget current conntrack (unconfirmed) and attach notrack entry
1194 static inline void ip_vs_notrack(struct sk_buff *skb)
1196 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1197 enum ip_conntrack_info ctinfo;
1198 struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
1200 if (!ct || !nf_ct_is_untracked(ct)) {
1202 skb->nfct = &nf_ct_untracked_get()->ct_general;
1203 skb->nfctinfo = IP_CT_NEW;
1204 nf_conntrack_get(skb->nfct);
1209 #ifdef CONFIG_IP_VS_NFCT
1211 * Netfilter connection tracking
1212 * (from ip_vs_nfct.c)
1214 static inline int ip_vs_conntrack_enabled(void)
1216 return sysctl_ip_vs_conntrack;
1219 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1221 extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1222 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1223 struct ip_vs_conn *cp, u_int8_t proto,
1224 const __be16 port, int from_rs);
1225 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1229 static inline int ip_vs_conntrack_enabled(void)
1234 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1235 struct ip_vs_conn *cp, int outin)
1239 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1240 struct ip_vs_conn *cp)
1245 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1248 /* CONFIG_IP_VS_NFCT */
1251 #endif /* __KERNEL__ */
1253 #endif /* _NET_IP_VS_H */