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 ip_vs_seq in_seq; /* incoming seq. struct */
553 struct ip_vs_seq out_seq; /* outgoing seq. struct */
555 const struct ip_vs_pe *pe;
559 struct rcu_head rcu_head;
562 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
565 * We need these to conveniently pass around service and destination
566 * options, but unfortunately, we also need to keep the old definitions to
567 * maintain userspace backwards compatibility for the setsockopt interface.
569 struct ip_vs_service_user_kern {
570 /* virtual service addresses */
573 union nf_inet_addr addr; /* virtual ip address */
575 u32 fwmark; /* firwall mark of service */
577 /* virtual service options */
580 unsigned int flags; /* virtual service flags */
581 unsigned int timeout; /* persistent timeout in sec */
582 __be32 netmask; /* persistent netmask or plen */
586 struct ip_vs_dest_user_kern {
587 /* destination server address */
588 union nf_inet_addr addr;
591 /* real server options */
592 unsigned int conn_flags; /* connection flags */
593 int weight; /* destination weight */
595 /* thresholds for active connections */
596 u32 u_threshold; /* upper threshold */
597 u32 l_threshold; /* lower threshold */
599 /* Address family of addr */
602 u16 tun_type; /* tunnel type */
603 __be16 tun_port; /* tunnel port */
604 u16 tun_flags; /* tunnel flags */
609 * The information about the virtual service offered to the net and the
610 * forwarding entries.
612 struct ip_vs_service {
613 struct hlist_node s_list; /* for normal service table */
614 struct hlist_node f_list; /* for fwmark-based service table */
615 atomic_t refcnt; /* reference counter */
617 u16 af; /* address family */
618 __u16 protocol; /* which protocol (TCP/UDP) */
619 union nf_inet_addr addr; /* IP address for virtual service */
620 __be16 port; /* port number for the service */
621 __u32 fwmark; /* firewall mark of the service */
622 unsigned int flags; /* service status flags */
623 unsigned int timeout; /* persistent timeout in ticks */
624 __be32 netmask; /* grouping granularity, mask/plen */
625 struct netns_ipvs *ipvs;
627 struct list_head destinations; /* real server d-linked list */
628 __u32 num_dests; /* number of servers */
629 struct ip_vs_stats stats; /* statistics for the service */
632 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
633 spinlock_t sched_lock; /* lock sched_data */
634 void *sched_data; /* scheduler application data */
636 /* alternate persistence engine */
637 struct ip_vs_pe __rcu *pe;
638 int conntrack_afmask;
640 struct rcu_head rcu_head;
643 /* Information for cached dst */
644 struct ip_vs_dest_dst {
645 struct dst_entry *dst_cache; /* destination cache entry */
647 union nf_inet_addr dst_saddr;
648 struct rcu_head rcu_head;
651 /* The real server destination forwarding entry with ip address, port number,
655 struct list_head n_list; /* for the dests in the service */
656 struct hlist_node d_list; /* for table with all the dests */
658 u16 af; /* address family */
659 __be16 port; /* port number of the server */
660 union nf_inet_addr addr; /* IP address of the server */
661 volatile unsigned int flags; /* dest status flags */
662 atomic_t conn_flags; /* flags to copy to conn */
663 atomic_t weight; /* server weight */
664 atomic_t last_weight; /* server latest weight */
665 __u16 tun_type; /* tunnel type */
666 __be16 tun_port; /* tunnel port */
667 __u16 tun_flags; /* tunnel flags */
669 refcount_t refcnt; /* reference counter */
670 struct ip_vs_stats stats; /* statistics */
671 unsigned long idle_start; /* start time, jiffies */
673 /* connection counters and thresholds */
674 atomic_t activeconns; /* active connections */
675 atomic_t inactconns; /* inactive connections */
676 atomic_t persistconns; /* persistent connections */
677 __u32 u_threshold; /* upper threshold */
678 __u32 l_threshold; /* lower threshold */
680 /* for destination cache */
681 spinlock_t dst_lock; /* lock of dst_cache */
682 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
684 /* for virtual service */
685 struct ip_vs_service __rcu *svc; /* service it belongs to */
686 __u16 protocol; /* which protocol (TCP/UDP) */
687 __be16 vport; /* virtual port number */
688 union nf_inet_addr vaddr; /* virtual IP address */
689 __u32 vfwmark; /* firewall mark of service */
691 struct list_head t_list; /* in dest_trash */
692 unsigned int in_rs_table:1; /* we are in rs_table */
695 /* The scheduler object */
696 struct ip_vs_scheduler {
697 struct list_head n_list; /* d-linked list head */
698 char *name; /* scheduler name */
699 atomic_t refcnt; /* reference counter */
700 struct module *module; /* THIS_MODULE/NULL */
702 /* scheduler initializing service */
703 int (*init_service)(struct ip_vs_service *svc);
704 /* scheduling service finish */
705 void (*done_service)(struct ip_vs_service *svc);
707 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
708 /* dest is unlinked */
709 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is updated */
711 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
713 /* selecting a server from the given service */
714 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
715 const struct sk_buff *skb,
716 struct ip_vs_iphdr *iph);
719 /* The persistence engine object */
721 struct list_head n_list; /* d-linked list head */
722 char *name; /* scheduler name */
723 atomic_t refcnt; /* reference counter */
724 struct module *module; /* THIS_MODULE/NULL */
726 /* get the connection template, if any */
727 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
728 bool (*ct_match)(const struct ip_vs_conn_param *p,
729 struct ip_vs_conn *ct);
730 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
732 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
733 /* create connections for real-server outgoing packets */
734 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
735 struct ip_vs_dest *dest,
737 const struct ip_vs_iphdr *iph,
738 __be16 dport, __be16 cport);
741 /* The application module object (a.k.a. app incarnation) */
743 struct list_head a_list; /* member in app list */
744 int type; /* IP_VS_APP_TYPE_xxx */
745 char *name; /* application module name */
747 struct module *module; /* THIS_MODULE/NULL */
748 struct list_head incs_list; /* list of incarnations */
750 /* members for application incarnations */
751 struct list_head p_list; /* member in proto app list */
752 struct ip_vs_app *app; /* its real application */
753 __be16 port; /* port number in net order */
754 atomic_t usecnt; /* usage counter */
755 struct rcu_head rcu_head;
757 /* output hook: Process packet in inout direction, diff set for TCP.
758 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
759 * 2=Mangled but checksum was not updated
761 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
762 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
764 /* input hook: Process packet in outin direction, diff set for TCP.
765 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
766 * 2=Mangled but checksum was not updated
768 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
769 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
771 /* ip_vs_app initializer */
772 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
774 /* ip_vs_app finish */
775 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
779 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
780 struct ip_vs_protocol *);
782 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
788 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
789 int *verdict, struct ip_vs_conn **cpp);
792 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
793 const struct iphdr *iph, int inverse);
796 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
797 const struct iphdr *iph, int inverse);
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);
806 struct ipvs_master_sync_state {
807 struct list_head sync_queue;
808 struct ip_vs_sync_buff *sync_buff;
809 unsigned long sync_queue_len;
810 unsigned int sync_queue_delay;
811 struct delayed_work master_wakeup_work;
812 struct netns_ipvs *ipvs;
815 struct ip_vs_sync_thread_data;
817 /* How much time to keep dests in trash */
818 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
820 struct ipvs_sync_daemon_cfg {
821 union nf_inet_addr mcast_group;
827 /* multicast interface name */
828 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
831 /* IPVS in network namespace */
833 int gen; /* Generation */
834 int enable; /* enable like nf_hooks do */
835 /* Hash table: for real service lookups */
836 #define IP_VS_RTAB_BITS 4
837 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
838 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
840 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
842 struct list_head app_list;
844 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
845 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
846 /* ip_vs_proto_tcp */
847 #ifdef CONFIG_IP_VS_PROTO_TCP
848 #define TCP_APP_TAB_BITS 4
849 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
850 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
851 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
853 /* ip_vs_proto_udp */
854 #ifdef CONFIG_IP_VS_PROTO_UDP
855 #define UDP_APP_TAB_BITS 4
856 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
857 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
858 struct list_head udp_apps[UDP_APP_TAB_SIZE];
860 /* ip_vs_proto_sctp */
861 #ifdef CONFIG_IP_VS_PROTO_SCTP
862 #define SCTP_APP_TAB_BITS 4
863 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
864 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
865 /* Hash table for SCTP application incarnations */
866 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
869 atomic_t conn_count; /* connection counter */
872 struct ip_vs_stats tot_stats; /* Statistics & est. */
874 int num_services; /* no of virtual services */
875 int num_services6; /* IPv6 virtual services */
877 /* Trash for destinations */
878 struct list_head dest_trash;
879 spinlock_t dest_trash_lock;
880 struct timer_list dest_trash_timer; /* expiration timer */
881 /* Service counters */
882 atomic_t ftpsvc_counter;
883 atomic_t nullsvc_counter;
884 atomic_t conn_out_counter;
887 /* delayed work for expiring no dest connections */
888 struct delayed_work expire_nodest_conn_work;
889 /* 1/rate drop and drop-entry variables */
890 struct delayed_work defense_work; /* Work handler */
896 spinlock_t dropentry_lock; /* drop entry handling */
897 spinlock_t droppacket_lock; /* drop packet handling */
898 spinlock_t securetcp_lock; /* state and timeout tables */
901 struct ctl_table_header *sysctl_hdr;
902 struct ctl_table *sysctl_tbl;
905 /* sysctl variables */
906 int sysctl_amemthresh;
907 int sysctl_am_droprate;
908 int sysctl_drop_entry;
909 int sysctl_drop_packet;
910 int sysctl_secure_tcp;
911 #ifdef CONFIG_IP_VS_NFCT
912 int sysctl_conntrack;
914 int sysctl_snat_reroute;
916 int sysctl_sync_ports;
917 int sysctl_sync_persist_mode;
918 unsigned long sysctl_sync_qlen_max;
919 int sysctl_sync_sock_size;
920 int sysctl_cache_bypass;
921 int sysctl_expire_nodest_conn;
922 int sysctl_sloppy_tcp;
923 int sysctl_sloppy_sctp;
924 int sysctl_expire_quiescent_template;
925 int sysctl_sync_threshold[2];
926 unsigned int sysctl_sync_refresh_period;
927 int sysctl_sync_retries;
928 int sysctl_nat_icmp_send;
929 int sysctl_pmtu_disc;
930 int sysctl_backup_only;
931 int sysctl_conn_reuse_mode;
932 int sysctl_schedule_icmp;
933 int sysctl_ignore_tunneled;
936 int sysctl_lblc_expiration;
937 struct ctl_table_header *lblc_ctl_header;
938 struct ctl_table *lblc_ctl_table;
940 int sysctl_lblcr_expiration;
941 struct ctl_table_header *lblcr_ctl_header;
942 struct ctl_table *lblcr_ctl_table;
944 struct list_head est_list; /* estimator list */
946 struct timer_list est_timer; /* Estimation timer */
948 spinlock_t sync_lock;
949 struct ipvs_master_sync_state *ms;
950 spinlock_t sync_buff_lock;
951 struct ip_vs_sync_thread_data *master_tinfo;
952 struct ip_vs_sync_thread_data *backup_tinfo;
954 volatile int sync_state;
955 struct mutex sync_mutex;
956 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
957 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
958 /* net name space ptr */
959 struct net *net; /* Needed by timer routines */
960 /* Number of heterogeneous destinations, needed becaus heterogeneous
961 * are not supported when synchronization is enabled.
963 unsigned int mixed_address_family_dests;
964 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
967 #define DEFAULT_SYNC_THRESHOLD 3
968 #define DEFAULT_SYNC_PERIOD 50
969 #define DEFAULT_SYNC_VER 1
970 #define DEFAULT_SLOPPY_TCP 0
971 #define DEFAULT_SLOPPY_SCTP 0
972 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
973 #define DEFAULT_SYNC_RETRIES 0
974 #define IPVS_SYNC_WAKEUP_RATE 8
975 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
976 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
977 #define IPVS_SYNC_CHECK_PERIOD HZ
978 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
979 #define IPVS_SYNC_PORTS_MAX (1 << 6)
983 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
985 return ipvs->sysctl_sync_threshold[0];
988 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
990 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
993 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
995 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
998 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1000 return ipvs->sysctl_sync_retries;
1003 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1005 return ipvs->sysctl_sync_ver;
1008 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1010 return ipvs->sysctl_sloppy_tcp;
1013 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1015 return ipvs->sysctl_sloppy_sctp;
1018 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1020 return READ_ONCE(ipvs->sysctl_sync_ports);
1023 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1025 return ipvs->sysctl_sync_persist_mode;
1028 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1030 return ipvs->sysctl_sync_qlen_max;
1033 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1035 return ipvs->sysctl_sync_sock_size;
1038 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1040 return ipvs->sysctl_pmtu_disc;
1043 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1045 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1046 ipvs->sysctl_backup_only;
1049 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1051 return ipvs->sysctl_conn_reuse_mode;
1054 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1056 return ipvs->sysctl_expire_nodest_conn;
1059 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1061 return ipvs->sysctl_schedule_icmp;
1064 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1066 return ipvs->sysctl_ignore_tunneled;
1069 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1071 return ipvs->sysctl_cache_bypass;
1076 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1078 return DEFAULT_SYNC_THRESHOLD;
1081 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1083 return DEFAULT_SYNC_PERIOD;
1086 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1088 return DEFAULT_SYNC_REFRESH_PERIOD;
1091 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1093 return DEFAULT_SYNC_RETRIES & 3;
1096 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1098 return DEFAULT_SYNC_VER;
1101 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1103 return DEFAULT_SLOPPY_TCP;
1106 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1108 return DEFAULT_SLOPPY_SCTP;
1111 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1116 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1121 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1123 return IPVS_SYNC_QLEN_MAX;
1126 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1131 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1136 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1141 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1146 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1151 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1156 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1161 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1168 /* IPVS core functions
1169 * (from ip_vs_core.c)
1171 const char *ip_vs_proto_name(unsigned int proto);
1172 void ip_vs_init_hash_table(struct list_head *table, int rows);
1173 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1174 struct ip_vs_dest *dest,
1175 struct sk_buff *skb,
1176 const struct ip_vs_iphdr *iph,
1179 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1181 #define IP_VS_APP_TYPE_FTP 1
1183 /* ip_vs_conn handling functions
1184 * (from ip_vs_conn.c)
1187 IP_VS_DIR_INPUT = 0,
1189 IP_VS_DIR_INPUT_ONLY,
1193 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1194 const union nf_inet_addr *caddr,
1196 const union nf_inet_addr *vaddr,
1198 struct ip_vs_conn_param *p)
1202 p->protocol = protocol;
1211 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1212 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1214 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1215 const struct sk_buff *skb,
1216 const struct ip_vs_iphdr *iph);
1218 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1220 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1221 const struct sk_buff *skb,
1222 const struct ip_vs_iphdr *iph);
1224 /* Get reference to gain full access to conn.
1225 * By default, RCU read-side critical sections have access only to
1226 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1228 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1230 return refcount_inc_not_zero(&cp->refcnt);
1233 /* put back the conn without restarting its timer */
1234 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1236 smp_mb__before_atomic();
1237 refcount_dec(&cp->refcnt);
1239 void ip_vs_conn_put(struct ip_vs_conn *cp);
1240 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1242 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1243 const union nf_inet_addr *daddr,
1244 __be16 dport, unsigned int flags,
1245 struct ip_vs_dest *dest, __u32 fwmark);
1246 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1248 const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1250 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1251 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1252 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1253 int ip_vs_conn_init(void);
1254 void ip_vs_conn_cleanup(void);
1256 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1258 struct ip_vs_conn *ctl_cp = cp->control;
1260 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1262 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1264 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1270 IP_VS_DBG_BUF(7, "DELeting control for: "
1271 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1272 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1274 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1275 ntohs(ctl_cp->cport));
1278 if (atomic_read(&ctl_cp->n_control) == 0) {
1279 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1281 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1283 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1288 atomic_dec(&ctl_cp->n_control);
1292 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1295 IP_VS_ERR_BUF("request control ADD for already controlled: "
1297 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1299 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1302 ip_vs_control_del(cp);
1305 IP_VS_DBG_BUF(7, "ADDing control for: "
1306 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1307 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1309 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1310 ntohs(ctl_cp->cport));
1312 cp->control = ctl_cp;
1313 atomic_inc(&ctl_cp->n_control);
1316 /* Mark our template as assured */
1318 ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1320 struct ip_vs_conn *ct = cp->control;
1322 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1323 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1324 ct->state |= IP_VS_CTPL_S_ASSURED;
1327 /* IPVS netns init & cleanup functions */
1328 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1329 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1330 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1331 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1332 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1333 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1334 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1335 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1336 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1337 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1338 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1339 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1340 void ip_vs_service_nets_cleanup(struct list_head *net_list);
1342 /* IPVS application functions
1343 * (from ip_vs_app.c)
1345 #define IP_VS_APP_MAX_PORTS 8
1346 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1347 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1348 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1349 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1350 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1352 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1353 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1355 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1356 struct ip_vs_iphdr *ipvsh);
1357 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1358 struct ip_vs_iphdr *ipvsh);
1360 int register_ip_vs_pe(struct ip_vs_pe *pe);
1361 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1362 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1363 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1365 /* Use a #define to avoid all of module.h just for these trivial ops */
1366 #define ip_vs_pe_get(pe) \
1367 if (pe && pe->module) \
1368 __module_get(pe->module);
1370 #define ip_vs_pe_put(pe) \
1371 if (pe && pe->module) \
1372 module_put(pe->module);
1374 /* IPVS protocol functions (from ip_vs_proto.c) */
1375 int ip_vs_protocol_init(void);
1376 void ip_vs_protocol_cleanup(void);
1377 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1378 int *ip_vs_create_timeout_table(int *table, int size);
1379 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1380 const struct sk_buff *skb, int offset,
1383 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1384 extern struct ip_vs_protocol ip_vs_protocol_udp;
1385 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1386 extern struct ip_vs_protocol ip_vs_protocol_esp;
1387 extern struct ip_vs_protocol ip_vs_protocol_ah;
1388 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1390 /* Registering/unregistering scheduler functions
1391 * (from ip_vs_sched.c)
1393 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1394 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1395 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1396 struct ip_vs_scheduler *scheduler);
1397 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1398 struct ip_vs_scheduler *sched);
1399 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1400 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1402 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1403 struct ip_vs_proto_data *pd, int *ignored,
1404 struct ip_vs_iphdr *iph);
1405 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1406 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1408 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1410 /* IPVS control data and functions (from ip_vs_ctl.c) */
1411 extern struct ip_vs_stats ip_vs_stats;
1412 extern int sysctl_ip_vs_sync_ver;
1414 struct ip_vs_service *
1415 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1416 const union nf_inet_addr *vaddr, __be16 vport);
1418 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1419 const union nf_inet_addr *daddr, __be16 dport);
1422 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1423 const union nf_inet_addr *daddr, __be16 dport);
1424 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1425 const union nf_inet_addr *daddr,
1428 int ip_vs_use_count_inc(void);
1429 void ip_vs_use_count_dec(void);
1430 int ip_vs_register_nl_ioctl(void);
1431 void ip_vs_unregister_nl_ioctl(void);
1432 int ip_vs_control_init(void);
1433 void ip_vs_control_cleanup(void);
1435 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1436 const union nf_inet_addr *daddr, __be16 dport,
1437 const union nf_inet_addr *vaddr, __be16 vport,
1438 __u16 protocol, __u32 fwmark, __u32 flags);
1439 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1441 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1443 refcount_inc(&dest->refcnt);
1446 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1448 smp_mb__before_atomic();
1449 refcount_dec(&dest->refcnt);
1452 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1454 if (refcount_dec_and_test(&dest->refcnt))
1458 /* IPVS sync daemon data and function prototypes
1459 * (from ip_vs_sync.c)
1461 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1463 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1464 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1466 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1467 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1468 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1469 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1470 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1472 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1473 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1474 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1475 int ip_vs_bypass_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_nat_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_tunnel_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_dr_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_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, int offset,
1485 unsigned int hooknum, struct ip_vs_iphdr *iph);
1486 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1488 #ifdef CONFIG_IP_VS_IPV6
1489 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1490 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1491 int ip_vs_nat_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_tunnel_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_dr_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_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1498 struct ip_vs_protocol *pp, int offset,
1499 unsigned int hooknum, struct ip_vs_iphdr *iph);
1502 #ifdef CONFIG_SYSCTL
1503 /* This is a simple mechanism to ignore packets when
1504 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1505 * we start to drop 1/rate of the packets
1507 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1509 if (!ipvs->drop_rate)
1511 if (--ipvs->drop_counter > 0)
1513 ipvs->drop_counter = ipvs->drop_rate;
1517 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1520 #ifdef CONFIG_SYSCTL
1521 /* Enqueue delayed work for expiring no dest connections
1522 * Only run when sysctl_expire_nodest=1
1524 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1526 if (sysctl_expire_nodest_conn(ipvs))
1527 queue_delayed_work(system_long_wq,
1528 &ipvs->expire_nodest_conn_work, 1);
1531 void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1533 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1536 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1537 IP_VS_CONN_F_FWD_MASK)
1539 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1540 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1542 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1546 switch (IP_VS_FWD_METHOD(cp)) {
1547 case IP_VS_CONN_F_MASQ:
1549 case IP_VS_CONN_F_LOCALNODE:
1551 case IP_VS_CONN_F_TUNNEL:
1553 case IP_VS_CONN_F_DROUTE:
1555 case IP_VS_CONN_F_BYPASS:
1563 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1564 struct ip_vs_conn *cp, int dir);
1566 #ifdef CONFIG_IP_VS_IPV6
1567 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1568 struct ip_vs_conn *cp, int dir);
1571 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1573 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1575 __be32 diff[2] = { ~old, new };
1577 return csum_partial(diff, sizeof(diff), oldsum);
1580 #ifdef CONFIG_IP_VS_IPV6
1581 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1584 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1585 new[3], new[2], new[1], new[0] };
1587 return csum_partial(diff, sizeof(diff), oldsum);
1591 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1593 __be16 diff[2] = { ~old, new };
1595 return csum_partial(diff, sizeof(diff), oldsum);
1598 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1599 static inline void ip_vs_notrack(struct sk_buff *skb)
1601 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1602 enum ip_conntrack_info ctinfo;
1603 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1606 nf_conntrack_put(&ct->ct_general);
1607 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1612 #ifdef CONFIG_IP_VS_NFCT
1613 /* Netfilter connection tracking
1614 * (from ip_vs_nfct.c)
1616 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1618 #ifdef CONFIG_SYSCTL
1619 return ipvs->sysctl_conntrack;
1625 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1627 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1628 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1629 struct ip_vs_conn *cp, u_int8_t proto,
1630 const __be16 port, int from_rs);
1631 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1635 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1640 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1641 struct ip_vs_conn *cp, int outin)
1645 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1650 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1653 #endif /* CONFIG_IP_VS_NFCT */
1655 /* Using old conntrack that can not be redirected to another real server? */
1656 static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1657 struct sk_buff *skb)
1659 #ifdef CONFIG_IP_VS_NFCT
1660 enum ip_conntrack_info ctinfo;
1663 ct = nf_ct_get(skb, &ctinfo);
1664 if (ct && nf_ct_is_confirmed(ct))
1670 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1672 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1673 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1676 if (!(svc->conntrack_afmask & afmask)) {
1677 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1679 svc->conntrack_afmask |= afmask;
1687 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1689 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1690 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1692 if (svc->conntrack_afmask & afmask) {
1693 nf_ct_netns_put(svc->ipvs->net, svc->af);
1694 svc->conntrack_afmask &= ~afmask;
1699 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1700 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1703 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1705 /* We think the overhead of processing active connections is 256
1706 * times higher than that of inactive connections in average. (This
1707 * 256 times might not be accurate, we will change it later) We
1708 * use the following formula to estimate the overhead now:
1709 * dest->activeconns*256 + dest->inactconns
1711 return (atomic_read(&dest->activeconns) << 8) +
1712 atomic_read(&dest->inactconns);
1715 #ifdef CONFIG_IP_VS_PROTO_TCP
1716 INDIRECT_CALLABLE_DECLARE(int
1717 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1718 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1721 #ifdef CONFIG_IP_VS_PROTO_UDP
1722 INDIRECT_CALLABLE_DECLARE(int
1723 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1724 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1726 #endif /* _NET_IP_VS_H */