1 /* SPDX-License-Identifier: GPL-2.0 */
3 * data structure and functionality definitions
9 #include <linux/ip_vs.h> /* definitions shared with userland */
11 #include <asm/types.h> /* for __uXX types */
13 #include <linux/list.h> /* for struct list_head */
14 #include <linux/spinlock.h> /* for struct rwlock_t */
15 #include <linux/atomic.h> /* for struct atomic_t */
16 #include <linux/refcount.h> /* for struct refcount_t */
17 #include <linux/workqueue.h>
19 #include <linux/compiler.h>
20 #include <linux/timer.h>
21 #include <linux/bug.h>
23 #include <net/checksum.h>
24 #include <linux/netfilter.h> /* for union nf_inet_addr */
26 #include <linux/ipv6.h> /* for struct ipv6hdr */
28 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
29 #include <net/netfilter/nf_conntrack.h>
31 #include <net/net_namespace.h> /* Netw namespace */
33 #define IP_VS_HDR_INVERSE 1
34 #define IP_VS_HDR_ICMP 2
36 /* Generic access of ipvs struct */
37 static inline struct netns_ipvs *net_ipvs(struct net* net)
42 /* Connections' size value needed by ip_vs_ctl.c */
43 extern int ip_vs_conn_tab_size;
46 int hdr_flags; /* ipvs flags */
47 __u32 off; /* Where IP or IPv4 header starts */
48 __u32 len; /* IPv4 simply where L4 starts
49 * IPv6 where L4 Transport Header starts */
50 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
53 union nf_inet_addr saddr;
54 union nf_inet_addr daddr;
57 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
58 int len, void *buffer)
60 return skb_header_pointer(skb, offset, len, buffer);
63 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
64 * IPv6 requires some extra work, as finding proper header position,
65 * depend on the IPv6 extension headers.
68 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
69 int hdr_flags, struct ip_vs_iphdr *iphdr)
71 iphdr->hdr_flags = hdr_flags;
74 #ifdef CONFIG_IP_VS_IPV6
77 const struct ipv6hdr *iph = skb_header_pointer(
78 skb, offset, sizeof(_iph), &_iph);
82 iphdr->saddr.in6 = iph->saddr;
83 iphdr->daddr.in6 = iph->daddr;
84 /* ipv6_find_hdr() updates len, flags */
87 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
90 if (iphdr->protocol < 0)
96 const struct iphdr *iph = skb_header_pointer(
97 skb, offset, sizeof(_iph), &_iph);
101 iphdr->len = offset + iph->ihl * 4;
103 iphdr->protocol = iph->protocol;
104 iphdr->saddr.ip = iph->saddr;
105 iphdr->daddr.ip = iph->daddr;
112 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
113 bool inverse, struct ip_vs_iphdr *iphdr)
115 int hdr_flags = IP_VS_HDR_ICMP;
118 hdr_flags |= IP_VS_HDR_INVERSE;
120 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
124 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
125 struct ip_vs_iphdr *iphdr)
130 hdr_flags |= IP_VS_HDR_INVERSE;
132 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
137 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
139 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
143 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
145 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
148 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
149 const union nf_inet_addr *src)
151 #ifdef CONFIG_IP_VS_IPV6
159 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
160 const union nf_inet_addr *src)
162 #ifdef CONFIG_IP_VS_IPV6
163 if (af == AF_INET6) {
174 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
175 const union nf_inet_addr *b)
177 #ifdef CONFIG_IP_VS_IPV6
179 return ipv6_addr_equal(&a->in6, &b->in6);
181 return a->ip == b->ip;
184 #ifdef CONFIG_IP_VS_DEBUG
185 #include <linux/net.h>
187 int ip_vs_get_debug_level(void);
189 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
190 const union nf_inet_addr *addr,
194 #ifdef CONFIG_IP_VS_IPV6
196 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
200 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
204 BUG_ON(*idx > buf_len + 1);
205 return &buf[*idx - len];
208 #define IP_VS_DBG_BUF(level, msg, ...) \
210 char ip_vs_dbg_buf[160]; \
211 int ip_vs_dbg_idx = 0; \
212 if (level <= ip_vs_get_debug_level()) \
213 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
215 #define IP_VS_ERR_BUF(msg...) \
217 char ip_vs_dbg_buf[160]; \
218 int ip_vs_dbg_idx = 0; \
222 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
223 #define IP_VS_DBG_ADDR(af, addr) \
224 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
225 sizeof(ip_vs_dbg_buf), addr, \
228 #define IP_VS_DBG(level, msg, ...) \
230 if (level <= ip_vs_get_debug_level()) \
231 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
233 #define IP_VS_DBG_RL(msg, ...) \
235 if (net_ratelimit()) \
236 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
238 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
240 if (level <= ip_vs_get_debug_level()) \
241 pp->debug_packet(af, pp, skb, ofs, msg); \
243 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
245 if (level <= ip_vs_get_debug_level() && \
247 pp->debug_packet(af, pp, skb, ofs, msg); \
249 #else /* NO DEBUGGING at ALL */
250 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
251 #define IP_VS_ERR_BUF(msg...) do {} while (0)
252 #define IP_VS_DBG(level, msg...) do {} while (0)
253 #define IP_VS_DBG_RL(msg...) do {} while (0)
254 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
255 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
258 #define IP_VS_BUG() BUG()
259 #define IP_VS_ERR_RL(msg, ...) \
261 if (net_ratelimit()) \
262 pr_err(msg, ##__VA_ARGS__); \
265 #ifdef CONFIG_IP_VS_DEBUG
266 #define EnterFunction(level) \
268 if (level <= ip_vs_get_debug_level()) \
270 pr_fmt("Enter: %s, %s line %i\n"), \
271 __func__, __FILE__, __LINE__); \
273 #define LeaveFunction(level) \
275 if (level <= ip_vs_get_debug_level()) \
277 pr_fmt("Leave: %s, %s line %i\n"), \
278 __func__, __FILE__, __LINE__); \
281 #define EnterFunction(level) do {} while (0)
282 #define LeaveFunction(level) do {} while (0)
285 /* The port number of FTP service (in network order). */
286 #define FTPPORT cpu_to_be16(21)
287 #define FTPDATA cpu_to_be16(20)
289 /* TCP State Values */
291 IP_VS_TCP_S_NONE = 0,
292 IP_VS_TCP_S_ESTABLISHED,
293 IP_VS_TCP_S_SYN_SENT,
294 IP_VS_TCP_S_SYN_RECV,
295 IP_VS_TCP_S_FIN_WAIT,
296 IP_VS_TCP_S_TIME_WAIT,
298 IP_VS_TCP_S_CLOSE_WAIT,
299 IP_VS_TCP_S_LAST_ACK,
305 /* UDP State Values */
311 /* ICMP State Values */
317 /* SCTP State Values */
318 enum ip_vs_sctp_states {
322 IP_VS_SCTP_S_COOKIE_SENT,
323 IP_VS_SCTP_S_COOKIE_REPLIED,
324 IP_VS_SCTP_S_COOKIE_WAIT,
326 IP_VS_SCTP_S_COOKIE_ECHOED,
327 IP_VS_SCTP_S_ESTABLISHED,
328 IP_VS_SCTP_S_SHUTDOWN_SENT,
329 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
330 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
331 IP_VS_SCTP_S_REJECTED,
336 /* Connection templates use bits from state */
337 #define IP_VS_CTPL_S_NONE 0x0000
338 #define IP_VS_CTPL_S_ASSURED 0x0001
339 #define IP_VS_CTPL_S_LAST 0x0002
341 /* Delta sequence info structure
342 * Each ip_vs_conn has 2 (output AND input seq. changes).
343 * Only used in the VS/NAT.
346 __u32 init_seq; /* Add delta from this seq */
347 __u32 delta; /* Delta in sequence numbers */
348 __u32 previous_delta; /* Delta in sequence numbers
349 * before last resized pkt */
352 /* counters per cpu */
353 struct ip_vs_counters {
354 __u64 conns; /* connections scheduled */
355 __u64 inpkts; /* incoming packets */
356 __u64 outpkts; /* outgoing packets */
357 __u64 inbytes; /* incoming bytes */
358 __u64 outbytes; /* outgoing bytes */
361 struct ip_vs_cpu_stats {
362 struct ip_vs_counters cnt;
363 struct u64_stats_sync syncp;
366 /* IPVS statistics objects */
367 struct ip_vs_estimator {
368 struct list_head list;
384 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
386 struct ip_vs_kstats {
387 u64 conns; /* connections scheduled */
388 u64 inpkts; /* incoming packets */
389 u64 outpkts; /* outgoing packets */
390 u64 inbytes; /* incoming bytes */
391 u64 outbytes; /* outgoing bytes */
393 u64 cps; /* current connection rate */
394 u64 inpps; /* current in packet rate */
395 u64 outpps; /* current out packet rate */
396 u64 inbps; /* current in byte rate */
397 u64 outbps; /* current out byte rate */
401 struct ip_vs_kstats kstats; /* kernel statistics */
402 struct ip_vs_estimator est; /* estimator */
403 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
404 spinlock_t lock; /* spin lock */
405 struct ip_vs_kstats kstats0; /* reset values */
413 struct ip_vs_proto_data;
415 struct ip_vs_protocol {
416 struct ip_vs_protocol *next;
422 void (*init)(struct ip_vs_protocol *pp);
424 void (*exit)(struct ip_vs_protocol *pp);
426 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
428 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
430 int (*conn_schedule)(struct netns_ipvs *ipvs,
431 int af, struct sk_buff *skb,
432 struct ip_vs_proto_data *pd,
433 int *verdict, struct ip_vs_conn **cpp,
434 struct ip_vs_iphdr *iph);
437 (*conn_in_get)(struct netns_ipvs *ipvs,
439 const struct sk_buff *skb,
440 const struct ip_vs_iphdr *iph);
443 (*conn_out_get)(struct netns_ipvs *ipvs,
445 const struct sk_buff *skb,
446 const struct ip_vs_iphdr *iph);
448 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
449 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
451 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
452 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
454 const char *(*state_name)(int state);
456 void (*state_transition)(struct ip_vs_conn *cp, int direction,
457 const struct sk_buff *skb,
458 struct ip_vs_proto_data *pd);
460 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
462 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
464 int (*app_conn_bind)(struct ip_vs_conn *cp);
466 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
467 const struct sk_buff *skb,
471 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
474 /* protocol data per netns */
475 struct ip_vs_proto_data {
476 struct ip_vs_proto_data *next;
477 struct ip_vs_protocol *pp;
478 int *timeout_table; /* protocol timeout table */
479 atomic_t appcnt; /* counter of proto app incs. */
480 struct tcp_states_t *tcp_state_table;
483 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
484 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
485 unsigned short proto);
487 struct ip_vs_conn_param {
488 struct netns_ipvs *ipvs;
489 const union nf_inet_addr *caddr;
490 const union nf_inet_addr *vaddr;
496 const struct ip_vs_pe *pe;
501 /* IP_VS structure allocated for each dynamically scheduled connection */
503 struct hlist_node c_list; /* hashed list heads */
504 /* Protocol, addresses and port numbers */
508 u16 af; /* address family */
509 union nf_inet_addr caddr; /* client address */
510 union nf_inet_addr vaddr; /* virtual address */
511 union nf_inet_addr daddr; /* destination address */
512 volatile __u32 flags; /* status flags */
513 __u16 protocol; /* Which protocol (TCP/UDP) */
514 __u16 daf; /* Address family of the dest */
515 struct netns_ipvs *ipvs;
517 /* counter and timer */
518 refcount_t refcnt; /* reference count */
519 struct timer_list timer; /* Expiration timer */
520 volatile unsigned long timeout; /* timeout */
522 /* Flags and state transition */
523 spinlock_t lock; /* lock for state transition */
524 volatile __u16 state; /* state info */
525 volatile __u16 old_state; /* old state, to be used for
526 * state transition triggerd
529 __u32 fwmark; /* Fire wall mark from skb */
530 unsigned long sync_endtime; /* jiffies + sent_retries */
532 /* Control members */
533 struct ip_vs_conn *control; /* Master control connection */
534 atomic_t n_control; /* Number of controlled ones */
535 struct ip_vs_dest *dest; /* real server */
536 atomic_t in_pkts; /* incoming packet counter */
538 /* Packet transmitter for different forwarding methods. If it
539 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
540 * otherwise this must be changed to a sk_buff **.
541 * NF_ACCEPT can be returned when destination is local.
543 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
544 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
546 /* Note: we can group the following members into a structure,
547 * in order to save more space, and the following members are
548 * only used in VS/NAT anyway
550 struct ip_vs_app *app; /* bound ip_vs_app object */
551 void *app_data; /* Application private data */
552 struct_group(sync_conn_opt,
553 struct ip_vs_seq in_seq; /* incoming seq. struct */
554 struct ip_vs_seq out_seq; /* outgoing seq. struct */
557 const struct ip_vs_pe *pe;
561 struct rcu_head rcu_head;
564 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
567 * We need these to conveniently pass around service and destination
568 * options, but unfortunately, we also need to keep the old definitions to
569 * maintain userspace backwards compatibility for the setsockopt interface.
571 struct ip_vs_service_user_kern {
572 /* virtual service addresses */
575 union nf_inet_addr addr; /* virtual ip address */
577 u32 fwmark; /* firwall mark of service */
579 /* virtual service options */
582 unsigned int flags; /* virtual service flags */
583 unsigned int timeout; /* persistent timeout in sec */
584 __be32 netmask; /* persistent netmask or plen */
588 struct ip_vs_dest_user_kern {
589 /* destination server address */
590 union nf_inet_addr addr;
593 /* real server options */
594 unsigned int conn_flags; /* connection flags */
595 int weight; /* destination weight */
597 /* thresholds for active connections */
598 u32 u_threshold; /* upper threshold */
599 u32 l_threshold; /* lower threshold */
601 /* Address family of addr */
604 u16 tun_type; /* tunnel type */
605 __be16 tun_port; /* tunnel port */
606 u16 tun_flags; /* tunnel flags */
611 * The information about the virtual service offered to the net and the
612 * forwarding entries.
614 struct ip_vs_service {
615 struct hlist_node s_list; /* for normal service table */
616 struct hlist_node f_list; /* for fwmark-based service table */
617 atomic_t refcnt; /* reference counter */
619 u16 af; /* address family */
620 __u16 protocol; /* which protocol (TCP/UDP) */
621 union nf_inet_addr addr; /* IP address for virtual service */
622 __be16 port; /* port number for the service */
623 __u32 fwmark; /* firewall mark of the service */
624 unsigned int flags; /* service status flags */
625 unsigned int timeout; /* persistent timeout in ticks */
626 __be32 netmask; /* grouping granularity, mask/plen */
627 struct netns_ipvs *ipvs;
629 struct list_head destinations; /* real server d-linked list */
630 __u32 num_dests; /* number of servers */
631 struct ip_vs_stats stats; /* statistics for the service */
634 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
635 spinlock_t sched_lock; /* lock sched_data */
636 void *sched_data; /* scheduler application data */
638 /* alternate persistence engine */
639 struct ip_vs_pe __rcu *pe;
640 int conntrack_afmask;
642 struct rcu_head rcu_head;
645 /* Information for cached dst */
646 struct ip_vs_dest_dst {
647 struct dst_entry *dst_cache; /* destination cache entry */
649 union nf_inet_addr dst_saddr;
650 struct rcu_head rcu_head;
653 /* The real server destination forwarding entry with ip address, port number,
657 struct list_head n_list; /* for the dests in the service */
658 struct hlist_node d_list; /* for table with all the dests */
660 u16 af; /* address family */
661 __be16 port; /* port number of the server */
662 union nf_inet_addr addr; /* IP address of the server */
663 volatile unsigned int flags; /* dest status flags */
664 atomic_t conn_flags; /* flags to copy to conn */
665 atomic_t weight; /* server weight */
666 atomic_t last_weight; /* server latest weight */
667 __u16 tun_type; /* tunnel type */
668 __be16 tun_port; /* tunnel port */
669 __u16 tun_flags; /* tunnel flags */
671 refcount_t refcnt; /* reference counter */
672 struct ip_vs_stats stats; /* statistics */
673 unsigned long idle_start; /* start time, jiffies */
675 /* connection counters and thresholds */
676 atomic_t activeconns; /* active connections */
677 atomic_t inactconns; /* inactive connections */
678 atomic_t persistconns; /* persistent connections */
679 __u32 u_threshold; /* upper threshold */
680 __u32 l_threshold; /* lower threshold */
682 /* for destination cache */
683 spinlock_t dst_lock; /* lock of dst_cache */
684 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
686 /* for virtual service */
687 struct ip_vs_service __rcu *svc; /* service it belongs to */
688 __u16 protocol; /* which protocol (TCP/UDP) */
689 __be16 vport; /* virtual port number */
690 union nf_inet_addr vaddr; /* virtual IP address */
691 __u32 vfwmark; /* firewall mark of service */
693 struct list_head t_list; /* in dest_trash */
694 unsigned int in_rs_table:1; /* we are in rs_table */
697 /* The scheduler object */
698 struct ip_vs_scheduler {
699 struct list_head n_list; /* d-linked list head */
700 char *name; /* scheduler name */
701 atomic_t refcnt; /* reference counter */
702 struct module *module; /* THIS_MODULE/NULL */
704 /* scheduler initializing service */
705 int (*init_service)(struct ip_vs_service *svc);
706 /* scheduling service finish */
707 void (*done_service)(struct ip_vs_service *svc);
709 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is unlinked */
711 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712 /* dest is updated */
713 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
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,
718 struct ip_vs_iphdr *iph);
721 /* The persistence engine object */
723 struct list_head n_list; /* d-linked list head */
724 char *name; /* scheduler name */
725 atomic_t refcnt; /* reference counter */
726 struct module *module; /* THIS_MODULE/NULL */
728 /* get the connection template, if any */
729 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
730 bool (*ct_match)(const struct ip_vs_conn_param *p,
731 struct ip_vs_conn *ct);
732 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
734 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
735 /* create connections for real-server outgoing packets */
736 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
737 struct ip_vs_dest *dest,
739 const struct ip_vs_iphdr *iph,
740 __be16 dport, __be16 cport);
743 /* The application module object (a.k.a. app incarnation) */
745 struct list_head a_list; /* member in app list */
746 int type; /* IP_VS_APP_TYPE_xxx */
747 char *name; /* application module name */
749 struct module *module; /* THIS_MODULE/NULL */
750 struct list_head incs_list; /* list of incarnations */
752 /* members for application incarnations */
753 struct list_head p_list; /* member in proto app list */
754 struct ip_vs_app *app; /* its real application */
755 __be16 port; /* port number in net order */
756 atomic_t usecnt; /* usage counter */
757 struct rcu_head rcu_head;
759 /* output hook: Process packet in inout direction, diff set for TCP.
760 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
761 * 2=Mangled but checksum was not updated
763 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
764 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
766 /* input hook: Process packet in outin direction, diff set for TCP.
767 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
768 * 2=Mangled but checksum was not updated
770 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
771 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
773 /* ip_vs_app initializer */
774 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
776 /* ip_vs_app finish */
777 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
781 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
782 struct ip_vs_protocol *);
784 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
790 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
791 int *verdict, struct ip_vs_conn **cpp);
794 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
795 const struct iphdr *iph, int inverse);
798 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
799 const struct iphdr *iph, int inverse);
801 int (*state_transition)(struct ip_vs_conn *cp, int direction,
802 const struct sk_buff *skb,
803 struct ip_vs_app *app);
805 void (*timeout_change)(struct ip_vs_app *app, int flags);
808 struct ipvs_master_sync_state {
809 struct list_head sync_queue;
810 struct ip_vs_sync_buff *sync_buff;
811 unsigned long sync_queue_len;
812 unsigned int sync_queue_delay;
813 struct delayed_work master_wakeup_work;
814 struct netns_ipvs *ipvs;
817 struct ip_vs_sync_thread_data;
819 /* How much time to keep dests in trash */
820 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
822 struct ipvs_sync_daemon_cfg {
823 union nf_inet_addr mcast_group;
829 /* multicast interface name */
830 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
833 /* IPVS in network namespace */
835 int gen; /* Generation */
836 int enable; /* enable like nf_hooks do */
837 /* Hash table: for real service lookups */
838 #define IP_VS_RTAB_BITS 4
839 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
840 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
842 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
844 struct list_head app_list;
846 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
847 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
848 /* ip_vs_proto_tcp */
849 #ifdef CONFIG_IP_VS_PROTO_TCP
850 #define TCP_APP_TAB_BITS 4
851 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
852 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
853 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
855 /* ip_vs_proto_udp */
856 #ifdef CONFIG_IP_VS_PROTO_UDP
857 #define UDP_APP_TAB_BITS 4
858 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
859 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
860 struct list_head udp_apps[UDP_APP_TAB_SIZE];
862 /* ip_vs_proto_sctp */
863 #ifdef CONFIG_IP_VS_PROTO_SCTP
864 #define SCTP_APP_TAB_BITS 4
865 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
866 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
867 /* Hash table for SCTP application incarnations */
868 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
871 atomic_t conn_count; /* connection counter */
874 struct ip_vs_stats tot_stats; /* Statistics & est. */
876 int num_services; /* no of virtual services */
877 int num_services6; /* IPv6 virtual services */
879 /* Trash for destinations */
880 struct list_head dest_trash;
881 spinlock_t dest_trash_lock;
882 struct timer_list dest_trash_timer; /* expiration timer */
883 /* Service counters */
884 atomic_t ftpsvc_counter;
885 atomic_t nullsvc_counter;
886 atomic_t conn_out_counter;
889 /* delayed work for expiring no dest connections */
890 struct delayed_work expire_nodest_conn_work;
891 /* 1/rate drop and drop-entry variables */
892 struct delayed_work defense_work; /* Work handler */
898 spinlock_t dropentry_lock; /* drop entry handling */
899 spinlock_t droppacket_lock; /* drop packet handling */
900 spinlock_t securetcp_lock; /* state and timeout tables */
903 struct ctl_table_header *sysctl_hdr;
904 struct ctl_table *sysctl_tbl;
907 /* sysctl variables */
908 int sysctl_amemthresh;
909 int sysctl_am_droprate;
910 int sysctl_drop_entry;
911 int sysctl_drop_packet;
912 int sysctl_secure_tcp;
913 #ifdef CONFIG_IP_VS_NFCT
914 int sysctl_conntrack;
916 int sysctl_snat_reroute;
918 int sysctl_sync_ports;
919 int sysctl_sync_persist_mode;
920 unsigned long sysctl_sync_qlen_max;
921 int sysctl_sync_sock_size;
922 int sysctl_cache_bypass;
923 int sysctl_expire_nodest_conn;
924 int sysctl_sloppy_tcp;
925 int sysctl_sloppy_sctp;
926 int sysctl_expire_quiescent_template;
927 int sysctl_sync_threshold[2];
928 unsigned int sysctl_sync_refresh_period;
929 int sysctl_sync_retries;
930 int sysctl_nat_icmp_send;
931 int sysctl_pmtu_disc;
932 int sysctl_backup_only;
933 int sysctl_conn_reuse_mode;
934 int sysctl_schedule_icmp;
935 int sysctl_ignore_tunneled;
938 int sysctl_lblc_expiration;
939 struct ctl_table_header *lblc_ctl_header;
940 struct ctl_table *lblc_ctl_table;
942 int sysctl_lblcr_expiration;
943 struct ctl_table_header *lblcr_ctl_header;
944 struct ctl_table *lblcr_ctl_table;
946 struct list_head est_list; /* estimator list */
948 struct timer_list est_timer; /* Estimation timer */
950 spinlock_t sync_lock;
951 struct ipvs_master_sync_state *ms;
952 spinlock_t sync_buff_lock;
953 struct ip_vs_sync_thread_data *master_tinfo;
954 struct ip_vs_sync_thread_data *backup_tinfo;
956 volatile int sync_state;
957 struct mutex sync_mutex;
958 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
959 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
960 /* net name space ptr */
961 struct net *net; /* Needed by timer routines */
962 /* Number of heterogeneous destinations, needed becaus heterogeneous
963 * are not supported when synchronization is enabled.
965 unsigned int mixed_address_family_dests;
966 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
969 #define DEFAULT_SYNC_THRESHOLD 3
970 #define DEFAULT_SYNC_PERIOD 50
971 #define DEFAULT_SYNC_VER 1
972 #define DEFAULT_SLOPPY_TCP 0
973 #define DEFAULT_SLOPPY_SCTP 0
974 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
975 #define DEFAULT_SYNC_RETRIES 0
976 #define IPVS_SYNC_WAKEUP_RATE 8
977 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
978 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
979 #define IPVS_SYNC_CHECK_PERIOD HZ
980 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
981 #define IPVS_SYNC_PORTS_MAX (1 << 6)
985 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
987 return ipvs->sysctl_sync_threshold[0];
990 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
992 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
995 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
997 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
1000 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1002 return ipvs->sysctl_sync_retries;
1005 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1007 return ipvs->sysctl_sync_ver;
1010 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1012 return ipvs->sysctl_sloppy_tcp;
1015 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1017 return ipvs->sysctl_sloppy_sctp;
1020 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1022 return READ_ONCE(ipvs->sysctl_sync_ports);
1025 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1027 return ipvs->sysctl_sync_persist_mode;
1030 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1032 return ipvs->sysctl_sync_qlen_max;
1035 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1037 return ipvs->sysctl_sync_sock_size;
1040 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1042 return ipvs->sysctl_pmtu_disc;
1045 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1047 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1048 ipvs->sysctl_backup_only;
1051 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1053 return ipvs->sysctl_conn_reuse_mode;
1056 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1058 return ipvs->sysctl_expire_nodest_conn;
1061 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1063 return ipvs->sysctl_schedule_icmp;
1066 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1068 return ipvs->sysctl_ignore_tunneled;
1071 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1073 return ipvs->sysctl_cache_bypass;
1078 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1080 return DEFAULT_SYNC_THRESHOLD;
1083 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1085 return DEFAULT_SYNC_PERIOD;
1088 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1090 return DEFAULT_SYNC_REFRESH_PERIOD;
1093 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1095 return DEFAULT_SYNC_RETRIES & 3;
1098 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1100 return DEFAULT_SYNC_VER;
1103 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1105 return DEFAULT_SLOPPY_TCP;
1108 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1110 return DEFAULT_SLOPPY_SCTP;
1113 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1118 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1123 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1125 return IPVS_SYNC_QLEN_MAX;
1128 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1133 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1138 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1143 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1148 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1153 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1158 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1163 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1170 /* IPVS core functions
1171 * (from ip_vs_core.c)
1173 const char *ip_vs_proto_name(unsigned int proto);
1174 void ip_vs_init_hash_table(struct list_head *table, int rows);
1175 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1176 struct ip_vs_dest *dest,
1177 struct sk_buff *skb,
1178 const struct ip_vs_iphdr *iph,
1181 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1183 #define IP_VS_APP_TYPE_FTP 1
1185 /* ip_vs_conn handling functions
1186 * (from ip_vs_conn.c)
1189 IP_VS_DIR_INPUT = 0,
1191 IP_VS_DIR_INPUT_ONLY,
1195 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1196 const union nf_inet_addr *caddr,
1198 const union nf_inet_addr *vaddr,
1200 struct ip_vs_conn_param *p)
1204 p->protocol = protocol;
1213 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1214 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1216 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1217 const struct sk_buff *skb,
1218 const struct ip_vs_iphdr *iph);
1220 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1222 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1223 const struct sk_buff *skb,
1224 const struct ip_vs_iphdr *iph);
1226 /* Get reference to gain full access to conn.
1227 * By default, RCU read-side critical sections have access only to
1228 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1230 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1232 return refcount_inc_not_zero(&cp->refcnt);
1235 /* put back the conn without restarting its timer */
1236 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1238 smp_mb__before_atomic();
1239 refcount_dec(&cp->refcnt);
1241 void ip_vs_conn_put(struct ip_vs_conn *cp);
1242 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1244 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1245 const union nf_inet_addr *daddr,
1246 __be16 dport, unsigned int flags,
1247 struct ip_vs_dest *dest, __u32 fwmark);
1248 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1250 const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1252 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1253 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1254 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1255 int ip_vs_conn_init(void);
1256 void ip_vs_conn_cleanup(void);
1258 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1260 struct ip_vs_conn *ctl_cp = cp->control;
1262 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1264 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1266 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1272 IP_VS_DBG_BUF(7, "DELeting control for: "
1273 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1274 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1276 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1277 ntohs(ctl_cp->cport));
1280 if (atomic_read(&ctl_cp->n_control) == 0) {
1281 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1283 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1285 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1290 atomic_dec(&ctl_cp->n_control);
1294 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1297 IP_VS_ERR_BUF("request control ADD for already controlled: "
1299 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1301 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1304 ip_vs_control_del(cp);
1307 IP_VS_DBG_BUF(7, "ADDing control for: "
1308 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1309 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1311 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1312 ntohs(ctl_cp->cport));
1314 cp->control = ctl_cp;
1315 atomic_inc(&ctl_cp->n_control);
1318 /* Mark our template as assured */
1320 ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1322 struct ip_vs_conn *ct = cp->control;
1324 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1325 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1326 ct->state |= IP_VS_CTPL_S_ASSURED;
1329 /* IPVS netns init & cleanup functions */
1330 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1331 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1332 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1333 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1334 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1335 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1336 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1337 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1338 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1339 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1340 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1341 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1342 void ip_vs_service_nets_cleanup(struct list_head *net_list);
1344 /* IPVS application functions
1345 * (from ip_vs_app.c)
1347 #define IP_VS_APP_MAX_PORTS 8
1348 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1349 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1350 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1351 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1352 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1354 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1355 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1357 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1358 struct ip_vs_iphdr *ipvsh);
1359 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1360 struct ip_vs_iphdr *ipvsh);
1362 int register_ip_vs_pe(struct ip_vs_pe *pe);
1363 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1364 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1365 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1367 /* Use a #define to avoid all of module.h just for these trivial ops */
1368 #define ip_vs_pe_get(pe) \
1369 if (pe && pe->module) \
1370 __module_get(pe->module);
1372 #define ip_vs_pe_put(pe) \
1373 if (pe && pe->module) \
1374 module_put(pe->module);
1376 /* IPVS protocol functions (from ip_vs_proto.c) */
1377 int ip_vs_protocol_init(void);
1378 void ip_vs_protocol_cleanup(void);
1379 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1380 int *ip_vs_create_timeout_table(int *table, int size);
1381 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1382 const struct sk_buff *skb, int offset,
1385 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1386 extern struct ip_vs_protocol ip_vs_protocol_udp;
1387 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1388 extern struct ip_vs_protocol ip_vs_protocol_esp;
1389 extern struct ip_vs_protocol ip_vs_protocol_ah;
1390 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1392 /* Registering/unregistering scheduler functions
1393 * (from ip_vs_sched.c)
1395 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1396 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1397 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1398 struct ip_vs_scheduler *scheduler);
1399 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1400 struct ip_vs_scheduler *sched);
1401 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1402 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1404 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1405 struct ip_vs_proto_data *pd, int *ignored,
1406 struct ip_vs_iphdr *iph);
1407 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1408 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1410 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1412 /* IPVS control data and functions (from ip_vs_ctl.c) */
1413 extern struct ip_vs_stats ip_vs_stats;
1414 extern int sysctl_ip_vs_sync_ver;
1416 struct ip_vs_service *
1417 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1418 const union nf_inet_addr *vaddr, __be16 vport);
1420 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1421 const union nf_inet_addr *daddr, __be16 dport);
1424 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1425 const union nf_inet_addr *daddr, __be16 dport);
1426 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1427 const union nf_inet_addr *daddr,
1430 int ip_vs_use_count_inc(void);
1431 void ip_vs_use_count_dec(void);
1432 int ip_vs_register_nl_ioctl(void);
1433 void ip_vs_unregister_nl_ioctl(void);
1434 int ip_vs_control_init(void);
1435 void ip_vs_control_cleanup(void);
1437 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1438 const union nf_inet_addr *daddr, __be16 dport,
1439 const union nf_inet_addr *vaddr, __be16 vport,
1440 __u16 protocol, __u32 fwmark, __u32 flags);
1441 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1443 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1445 refcount_inc(&dest->refcnt);
1448 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1450 smp_mb__before_atomic();
1451 refcount_dec(&dest->refcnt);
1454 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1456 if (refcount_dec_and_test(&dest->refcnt))
1460 /* IPVS sync daemon data and function prototypes
1461 * (from ip_vs_sync.c)
1463 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1465 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1466 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1468 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1469 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1470 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1471 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1472 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1474 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1475 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1476 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1477 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1478 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1485 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1486 struct ip_vs_protocol *pp, int offset,
1487 unsigned int hooknum, struct ip_vs_iphdr *iph);
1488 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1490 #ifdef CONFIG_IP_VS_IPV6
1491 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1492 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1493 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1494 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1495 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1496 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1497 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1498 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1499 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1500 struct ip_vs_protocol *pp, int offset,
1501 unsigned int hooknum, struct ip_vs_iphdr *iph);
1504 #ifdef CONFIG_SYSCTL
1505 /* This is a simple mechanism to ignore packets when
1506 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1507 * we start to drop 1/rate of the packets
1509 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1511 if (!ipvs->drop_rate)
1513 if (--ipvs->drop_counter > 0)
1515 ipvs->drop_counter = ipvs->drop_rate;
1519 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1522 #ifdef CONFIG_SYSCTL
1523 /* Enqueue delayed work for expiring no dest connections
1524 * Only run when sysctl_expire_nodest=1
1526 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1528 if (sysctl_expire_nodest_conn(ipvs))
1529 queue_delayed_work(system_long_wq,
1530 &ipvs->expire_nodest_conn_work, 1);
1533 void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1535 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1538 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1539 IP_VS_CONN_F_FWD_MASK)
1541 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1542 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1544 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1548 switch (IP_VS_FWD_METHOD(cp)) {
1549 case IP_VS_CONN_F_MASQ:
1551 case IP_VS_CONN_F_LOCALNODE:
1553 case IP_VS_CONN_F_TUNNEL:
1555 case IP_VS_CONN_F_DROUTE:
1557 case IP_VS_CONN_F_BYPASS:
1565 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1566 struct ip_vs_conn *cp, int dir);
1568 #ifdef CONFIG_IP_VS_IPV6
1569 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1570 struct ip_vs_conn *cp, int dir);
1573 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1575 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1577 __be32 diff[2] = { ~old, new };
1579 return csum_partial(diff, sizeof(diff), oldsum);
1582 #ifdef CONFIG_IP_VS_IPV6
1583 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1586 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1587 new[3], new[2], new[1], new[0] };
1589 return csum_partial(diff, sizeof(diff), oldsum);
1593 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1595 __be16 diff[2] = { ~old, new };
1597 return csum_partial(diff, sizeof(diff), oldsum);
1600 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1601 static inline void ip_vs_notrack(struct sk_buff *skb)
1603 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1604 enum ip_conntrack_info ctinfo;
1605 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1608 nf_conntrack_put(&ct->ct_general);
1609 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1614 #ifdef CONFIG_IP_VS_NFCT
1615 /* Netfilter connection tracking
1616 * (from ip_vs_nfct.c)
1618 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1620 #ifdef CONFIG_SYSCTL
1621 return ipvs->sysctl_conntrack;
1627 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1629 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1630 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1631 struct ip_vs_conn *cp, u_int8_t proto,
1632 const __be16 port, int from_rs);
1633 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1637 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1642 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1643 struct ip_vs_conn *cp, int outin)
1647 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1652 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1655 #endif /* CONFIG_IP_VS_NFCT */
1657 /* Using old conntrack that can not be redirected to another real server? */
1658 static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1659 struct sk_buff *skb)
1661 #ifdef CONFIG_IP_VS_NFCT
1662 enum ip_conntrack_info ctinfo;
1665 ct = nf_ct_get(skb, &ctinfo);
1666 if (ct && nf_ct_is_confirmed(ct))
1672 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1674 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1675 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1678 if (!(svc->conntrack_afmask & afmask)) {
1679 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1681 svc->conntrack_afmask |= afmask;
1689 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1691 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1692 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1694 if (svc->conntrack_afmask & afmask) {
1695 nf_ct_netns_put(svc->ipvs->net, svc->af);
1696 svc->conntrack_afmask &= ~afmask;
1701 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1702 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1705 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1707 /* We think the overhead of processing active connections is 256
1708 * times higher than that of inactive connections in average. (This
1709 * 256 times might not be accurate, we will change it later) We
1710 * use the following formula to estimate the overhead now:
1711 * dest->activeconns*256 + dest->inactconns
1713 return (atomic_read(&dest->activeconns) << 8) +
1714 atomic_read(&dest->inactconns);
1717 #endif /* _NET_IP_VS_H */