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 */
18 #include <linux/compiler.h>
19 #include <linux/timer.h>
20 #include <linux/bug.h>
22 #include <net/checksum.h>
23 #include <linux/netfilter.h> /* for union nf_inet_addr */
25 #include <linux/ipv6.h> /* for struct ipv6hdr */
27 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
28 #include <linux/netfilter_ipv6/ip6_tables.h>
30 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
31 #include <net/netfilter/nf_conntrack.h>
33 #include <net/net_namespace.h> /* Netw namespace */
35 #define IP_VS_HDR_INVERSE 1
36 #define IP_VS_HDR_ICMP 2
38 /* Generic access of ipvs struct */
39 static inline struct netns_ipvs
*net_ipvs(struct net
* net
)
44 /* Connections' size value needed by ip_vs_ctl.c */
45 extern int ip_vs_conn_tab_size
;
48 int hdr_flags
; /* ipvs flags */
49 __u32 off
; /* Where IP or IPv4 header starts */
50 __u32 len
; /* IPv4 simply where L4 starts
51 * IPv6 where L4 Transport Header starts */
52 __u16 fragoffs
; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
55 union nf_inet_addr saddr
;
56 union nf_inet_addr daddr
;
59 static inline void *frag_safe_skb_hp(const struct sk_buff
*skb
, int offset
,
60 int len
, void *buffer
)
62 return skb_header_pointer(skb
, offset
, len
, buffer
);
65 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
66 * IPv6 requires some extra work, as finding proper header position,
67 * depend on the IPv6 extension headers.
70 ip_vs_fill_iph_skb_off(int af
, const struct sk_buff
*skb
, int offset
,
71 int hdr_flags
, struct ip_vs_iphdr
*iphdr
)
73 iphdr
->hdr_flags
= hdr_flags
;
76 #ifdef CONFIG_IP_VS_IPV6
79 const struct ipv6hdr
*iph
= skb_header_pointer(
80 skb
, offset
, sizeof(_iph
), &_iph
);
84 iphdr
->saddr
.in6
= iph
->saddr
;
85 iphdr
->daddr
.in6
= iph
->daddr
;
86 /* ipv6_find_hdr() updates len, flags */
89 iphdr
->protocol
= ipv6_find_hdr(skb
, &iphdr
->len
, -1,
92 if (iphdr
->protocol
< 0)
98 const struct iphdr
*iph
= skb_header_pointer(
99 skb
, offset
, sizeof(_iph
), &_iph
);
103 iphdr
->len
= offset
+ iph
->ihl
* 4;
105 iphdr
->protocol
= iph
->protocol
;
106 iphdr
->saddr
.ip
= iph
->saddr
;
107 iphdr
->daddr
.ip
= iph
->daddr
;
114 ip_vs_fill_iph_skb_icmp(int af
, const struct sk_buff
*skb
, int offset
,
115 bool inverse
, struct ip_vs_iphdr
*iphdr
)
117 int hdr_flags
= IP_VS_HDR_ICMP
;
120 hdr_flags
|= IP_VS_HDR_INVERSE
;
122 return ip_vs_fill_iph_skb_off(af
, skb
, offset
, hdr_flags
, iphdr
);
126 ip_vs_fill_iph_skb(int af
, const struct sk_buff
*skb
, bool inverse
,
127 struct ip_vs_iphdr
*iphdr
)
132 hdr_flags
|= IP_VS_HDR_INVERSE
;
134 return ip_vs_fill_iph_skb_off(af
, skb
, skb_network_offset(skb
),
139 ip_vs_iph_inverse(const struct ip_vs_iphdr
*iph
)
141 return !!(iph
->hdr_flags
& IP_VS_HDR_INVERSE
);
145 ip_vs_iph_icmp(const struct ip_vs_iphdr
*iph
)
147 return !!(iph
->hdr_flags
& IP_VS_HDR_ICMP
);
150 static inline void ip_vs_addr_copy(int af
, union nf_inet_addr
*dst
,
151 const union nf_inet_addr
*src
)
153 #ifdef CONFIG_IP_VS_IPV6
161 static inline void ip_vs_addr_set(int af
, union nf_inet_addr
*dst
,
162 const union nf_inet_addr
*src
)
164 #ifdef CONFIG_IP_VS_IPV6
165 if (af
== AF_INET6
) {
176 static inline int ip_vs_addr_equal(int af
, const union nf_inet_addr
*a
,
177 const union nf_inet_addr
*b
)
179 #ifdef CONFIG_IP_VS_IPV6
181 return ipv6_addr_equal(&a
->in6
, &b
->in6
);
183 return a
->ip
== b
->ip
;
186 #ifdef CONFIG_IP_VS_DEBUG
187 #include <linux/net.h>
189 int ip_vs_get_debug_level(void);
191 static inline const char *ip_vs_dbg_addr(int af
, char *buf
, size_t buf_len
,
192 const union nf_inet_addr
*addr
,
196 #ifdef CONFIG_IP_VS_IPV6
198 len
= snprintf(&buf
[*idx
], buf_len
- *idx
, "[%pI6c]",
202 len
= snprintf(&buf
[*idx
], buf_len
- *idx
, "%pI4",
206 BUG_ON(*idx
> buf_len
+ 1);
207 return &buf
[*idx
- len
];
210 #define IP_VS_DBG_BUF(level, msg, ...) \
212 char ip_vs_dbg_buf[160]; \
213 int ip_vs_dbg_idx = 0; \
214 if (level <= ip_vs_get_debug_level()) \
215 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
217 #define IP_VS_ERR_BUF(msg...) \
219 char ip_vs_dbg_buf[160]; \
220 int ip_vs_dbg_idx = 0; \
224 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
225 #define IP_VS_DBG_ADDR(af, addr) \
226 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
227 sizeof(ip_vs_dbg_buf), addr, \
230 #define IP_VS_DBG(level, msg, ...) \
232 if (level <= ip_vs_get_debug_level()) \
233 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
235 #define IP_VS_DBG_RL(msg, ...) \
237 if (net_ratelimit()) \
238 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
240 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
242 if (level <= ip_vs_get_debug_level()) \
243 pp->debug_packet(af, pp, skb, ofs, msg); \
245 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
247 if (level <= ip_vs_get_debug_level() && \
249 pp->debug_packet(af, pp, skb, ofs, msg); \
251 #else /* NO DEBUGGING at ALL */
252 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
253 #define IP_VS_ERR_BUF(msg...) do {} while (0)
254 #define IP_VS_DBG(level, msg...) do {} while (0)
255 #define IP_VS_DBG_RL(msg...) do {} while (0)
256 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
257 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
260 #define IP_VS_BUG() BUG()
261 #define IP_VS_ERR_RL(msg, ...) \
263 if (net_ratelimit()) \
264 pr_err(msg, ##__VA_ARGS__); \
267 #ifdef CONFIG_IP_VS_DEBUG
268 #define EnterFunction(level) \
270 if (level <= ip_vs_get_debug_level()) \
272 pr_fmt("Enter: %s, %s line %i\n"), \
273 __func__, __FILE__, __LINE__); \
275 #define LeaveFunction(level) \
277 if (level <= ip_vs_get_debug_level()) \
279 pr_fmt("Leave: %s, %s line %i\n"), \
280 __func__, __FILE__, __LINE__); \
283 #define EnterFunction(level) do {} while (0)
284 #define LeaveFunction(level) do {} while (0)
287 /* The port number of FTP service (in network order). */
288 #define FTPPORT cpu_to_be16(21)
289 #define FTPDATA cpu_to_be16(20)
291 /* TCP State Values */
293 IP_VS_TCP_S_NONE
= 0,
294 IP_VS_TCP_S_ESTABLISHED
,
295 IP_VS_TCP_S_SYN_SENT
,
296 IP_VS_TCP_S_SYN_RECV
,
297 IP_VS_TCP_S_FIN_WAIT
,
298 IP_VS_TCP_S_TIME_WAIT
,
300 IP_VS_TCP_S_CLOSE_WAIT
,
301 IP_VS_TCP_S_LAST_ACK
,
307 /* UDP State Values */
313 /* ICMP State Values */
319 /* SCTP State Values */
320 enum ip_vs_sctp_states
{
324 IP_VS_SCTP_S_COOKIE_SENT
,
325 IP_VS_SCTP_S_COOKIE_REPLIED
,
326 IP_VS_SCTP_S_COOKIE_WAIT
,
328 IP_VS_SCTP_S_COOKIE_ECHOED
,
329 IP_VS_SCTP_S_ESTABLISHED
,
330 IP_VS_SCTP_S_SHUTDOWN_SENT
,
331 IP_VS_SCTP_S_SHUTDOWN_RECEIVED
,
332 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT
,
333 IP_VS_SCTP_S_REJECTED
,
338 /* Connection templates use bits from state */
339 #define IP_VS_CTPL_S_NONE 0x0000
340 #define IP_VS_CTPL_S_ASSURED 0x0001
341 #define IP_VS_CTPL_S_LAST 0x0002
343 /* Delta sequence info structure
344 * Each ip_vs_conn has 2 (output AND input seq. changes).
345 * Only used in the VS/NAT.
348 __u32 init_seq
; /* Add delta from this seq */
349 __u32 delta
; /* Delta in sequence numbers */
350 __u32 previous_delta
; /* Delta in sequence numbers
351 * before last resized pkt */
354 /* counters per cpu */
355 struct ip_vs_counters
{
356 __u64 conns
; /* connections scheduled */
357 __u64 inpkts
; /* incoming packets */
358 __u64 outpkts
; /* outgoing packets */
359 __u64 inbytes
; /* incoming bytes */
360 __u64 outbytes
; /* outgoing bytes */
363 struct ip_vs_cpu_stats
{
364 struct ip_vs_counters cnt
;
365 struct u64_stats_sync syncp
;
368 /* IPVS statistics objects */
369 struct ip_vs_estimator
{
370 struct list_head list
;
386 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
388 struct ip_vs_kstats
{
389 u64 conns
; /* connections scheduled */
390 u64 inpkts
; /* incoming packets */
391 u64 outpkts
; /* outgoing packets */
392 u64 inbytes
; /* incoming bytes */
393 u64 outbytes
; /* outgoing bytes */
395 u64 cps
; /* current connection rate */
396 u64 inpps
; /* current in packet rate */
397 u64 outpps
; /* current out packet rate */
398 u64 inbps
; /* current in byte rate */
399 u64 outbps
; /* current out byte rate */
403 struct ip_vs_kstats kstats
; /* kernel statistics */
404 struct ip_vs_estimator est
; /* estimator */
405 struct ip_vs_cpu_stats __percpu
*cpustats
; /* per cpu counters */
406 spinlock_t lock
; /* spin lock */
407 struct ip_vs_kstats kstats0
; /* reset values */
415 struct ip_vs_proto_data
;
417 struct ip_vs_protocol
{
418 struct ip_vs_protocol
*next
;
424 void (*init
)(struct ip_vs_protocol
*pp
);
426 void (*exit
)(struct ip_vs_protocol
*pp
);
428 int (*init_netns
)(struct netns_ipvs
*ipvs
, struct ip_vs_proto_data
*pd
);
430 void (*exit_netns
)(struct netns_ipvs
*ipvs
, struct ip_vs_proto_data
*pd
);
432 int (*conn_schedule
)(struct netns_ipvs
*ipvs
,
433 int af
, struct sk_buff
*skb
,
434 struct ip_vs_proto_data
*pd
,
435 int *verdict
, struct ip_vs_conn
**cpp
,
436 struct ip_vs_iphdr
*iph
);
439 (*conn_in_get
)(struct netns_ipvs
*ipvs
,
441 const struct sk_buff
*skb
,
442 const struct ip_vs_iphdr
*iph
);
445 (*conn_out_get
)(struct netns_ipvs
*ipvs
,
447 const struct sk_buff
*skb
,
448 const struct ip_vs_iphdr
*iph
);
450 int (*snat_handler
)(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
451 struct ip_vs_conn
*cp
, struct ip_vs_iphdr
*iph
);
453 int (*dnat_handler
)(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
454 struct ip_vs_conn
*cp
, struct ip_vs_iphdr
*iph
);
456 const char *(*state_name
)(int state
);
458 void (*state_transition
)(struct ip_vs_conn
*cp
, int direction
,
459 const struct sk_buff
*skb
,
460 struct ip_vs_proto_data
*pd
);
462 int (*register_app
)(struct netns_ipvs
*ipvs
, struct ip_vs_app
*inc
);
464 void (*unregister_app
)(struct netns_ipvs
*ipvs
, struct ip_vs_app
*inc
);
466 int (*app_conn_bind
)(struct ip_vs_conn
*cp
);
468 void (*debug_packet
)(int af
, struct ip_vs_protocol
*pp
,
469 const struct sk_buff
*skb
,
473 void (*timeout_change
)(struct ip_vs_proto_data
*pd
, int flags
);
476 /* protocol data per netns */
477 struct ip_vs_proto_data
{
478 struct ip_vs_proto_data
*next
;
479 struct ip_vs_protocol
*pp
;
480 int *timeout_table
; /* protocol timeout table */
481 atomic_t appcnt
; /* counter of proto app incs. */
482 struct tcp_states_t
*tcp_state_table
;
485 struct ip_vs_protocol
*ip_vs_proto_get(unsigned short proto
);
486 struct ip_vs_proto_data
*ip_vs_proto_data_get(struct netns_ipvs
*ipvs
,
487 unsigned short proto
);
489 struct ip_vs_conn_param
{
490 struct netns_ipvs
*ipvs
;
491 const union nf_inet_addr
*caddr
;
492 const union nf_inet_addr
*vaddr
;
498 const struct ip_vs_pe
*pe
;
503 /* IP_VS structure allocated for each dynamically scheduled connection */
505 struct hlist_node c_list
; /* hashed list heads */
506 /* Protocol, addresses and port numbers */
510 u16 af
; /* address family */
511 union nf_inet_addr caddr
; /* client address */
512 union nf_inet_addr vaddr
; /* virtual address */
513 union nf_inet_addr daddr
; /* destination address */
514 volatile __u32 flags
; /* status flags */
515 __u16 protocol
; /* Which protocol (TCP/UDP) */
516 __u16 daf
; /* Address family of the dest */
517 struct netns_ipvs
*ipvs
;
519 /* counter and timer */
520 refcount_t refcnt
; /* reference count */
521 struct timer_list timer
; /* Expiration timer */
522 volatile unsigned long timeout
; /* timeout */
524 /* Flags and state transition */
525 spinlock_t lock
; /* lock for state transition */
526 volatile __u16 state
; /* state info */
527 volatile __u16 old_state
; /* old state, to be used for
528 * state transition triggerd
531 __u32 fwmark
; /* Fire wall mark from skb */
532 unsigned long sync_endtime
; /* jiffies + sent_retries */
534 /* Control members */
535 struct ip_vs_conn
*control
; /* Master control connection */
536 atomic_t n_control
; /* Number of controlled ones */
537 struct ip_vs_dest
*dest
; /* real server */
538 atomic_t in_pkts
; /* incoming packet counter */
540 /* Packet transmitter for different forwarding methods. If it
541 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
542 * otherwise this must be changed to a sk_buff **.
543 * NF_ACCEPT can be returned when destination is local.
545 int (*packet_xmit
)(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
546 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
548 /* Note: we can group the following members into a structure,
549 * in order to save more space, and the following members are
550 * only used in VS/NAT anyway
552 struct ip_vs_app
*app
; /* bound ip_vs_app object */
553 void *app_data
; /* Application private data */
554 struct ip_vs_seq in_seq
; /* incoming seq. struct */
555 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 */
607 * The information about the virtual service offered to the net and the
608 * forwarding entries.
610 struct ip_vs_service
{
611 struct hlist_node s_list
; /* for normal service table */
612 struct hlist_node f_list
; /* for fwmark-based service table */
613 atomic_t refcnt
; /* reference counter */
615 u16 af
; /* address family */
616 __u16 protocol
; /* which protocol (TCP/UDP) */
617 union nf_inet_addr addr
; /* IP address for virtual service */
618 __be16 port
; /* port number for the service */
619 __u32 fwmark
; /* firewall mark of the service */
620 unsigned int flags
; /* service status flags */
621 unsigned int timeout
; /* persistent timeout in ticks */
622 __be32 netmask
; /* grouping granularity, mask/plen */
623 struct netns_ipvs
*ipvs
;
625 struct list_head destinations
; /* real server d-linked list */
626 __u32 num_dests
; /* number of servers */
627 struct ip_vs_stats stats
; /* statistics for the service */
630 struct ip_vs_scheduler __rcu
*scheduler
; /* bound scheduler object */
631 spinlock_t sched_lock
; /* lock sched_data */
632 void *sched_data
; /* scheduler application data */
634 /* alternate persistence engine */
635 struct ip_vs_pe __rcu
*pe
;
636 int conntrack_afmask
;
638 struct rcu_head rcu_head
;
641 /* Information for cached dst */
642 struct ip_vs_dest_dst
{
643 struct dst_entry
*dst_cache
; /* destination cache entry */
645 union nf_inet_addr dst_saddr
;
646 struct rcu_head rcu_head
;
649 /* The real server destination forwarding entry with ip address, port number,
653 struct list_head n_list
; /* for the dests in the service */
654 struct hlist_node d_list
; /* for table with all the dests */
656 u16 af
; /* address family */
657 __be16 port
; /* port number of the server */
658 union nf_inet_addr addr
; /* IP address of the server */
659 volatile unsigned int flags
; /* dest status flags */
660 atomic_t conn_flags
; /* flags to copy to conn */
661 atomic_t weight
; /* server weight */
662 atomic_t last_weight
; /* server latest weight */
664 refcount_t refcnt
; /* reference counter */
665 struct ip_vs_stats stats
; /* statistics */
666 unsigned long idle_start
; /* start time, jiffies */
668 /* connection counters and thresholds */
669 atomic_t activeconns
; /* active connections */
670 atomic_t inactconns
; /* inactive connections */
671 atomic_t persistconns
; /* persistent connections */
672 __u32 u_threshold
; /* upper threshold */
673 __u32 l_threshold
; /* lower threshold */
675 /* for destination cache */
676 spinlock_t dst_lock
; /* lock of dst_cache */
677 struct ip_vs_dest_dst __rcu
*dest_dst
; /* cached dst info */
679 /* for virtual service */
680 struct ip_vs_service __rcu
*svc
; /* service it belongs to */
681 __u16 protocol
; /* which protocol (TCP/UDP) */
682 __be16 vport
; /* virtual port number */
683 union nf_inet_addr vaddr
; /* virtual IP address */
684 __u32 vfwmark
; /* firewall mark of service */
686 struct list_head t_list
; /* in dest_trash */
687 unsigned int in_rs_table
:1; /* we are in rs_table */
690 /* The scheduler object */
691 struct ip_vs_scheduler
{
692 struct list_head n_list
; /* d-linked list head */
693 char *name
; /* scheduler name */
694 atomic_t refcnt
; /* reference counter */
695 struct module
*module
; /* THIS_MODULE/NULL */
697 /* scheduler initializing service */
698 int (*init_service
)(struct ip_vs_service
*svc
);
699 /* scheduling service finish */
700 void (*done_service
)(struct ip_vs_service
*svc
);
702 int (*add_dest
)(struct ip_vs_service
*svc
, struct ip_vs_dest
*dest
);
703 /* dest is unlinked */
704 int (*del_dest
)(struct ip_vs_service
*svc
, struct ip_vs_dest
*dest
);
705 /* dest is updated */
706 int (*upd_dest
)(struct ip_vs_service
*svc
, struct ip_vs_dest
*dest
);
708 /* selecting a server from the given service */
709 struct ip_vs_dest
* (*schedule
)(struct ip_vs_service
*svc
,
710 const struct sk_buff
*skb
,
711 struct ip_vs_iphdr
*iph
);
714 /* The persistence engine object */
716 struct list_head n_list
; /* d-linked list head */
717 char *name
; /* scheduler name */
718 atomic_t refcnt
; /* reference counter */
719 struct module
*module
; /* THIS_MODULE/NULL */
721 /* get the connection template, if any */
722 int (*fill_param
)(struct ip_vs_conn_param
*p
, struct sk_buff
*skb
);
723 bool (*ct_match
)(const struct ip_vs_conn_param
*p
,
724 struct ip_vs_conn
*ct
);
725 u32 (*hashkey_raw
)(const struct ip_vs_conn_param
*p
, u32 initval
,
727 int (*show_pe_data
)(const struct ip_vs_conn
*cp
, char *buf
);
728 /* create connections for real-server outgoing packets */
729 struct ip_vs_conn
* (*conn_out
)(struct ip_vs_service
*svc
,
730 struct ip_vs_dest
*dest
,
732 const struct ip_vs_iphdr
*iph
,
733 __be16 dport
, __be16 cport
);
736 /* The application module object (a.k.a. app incarnation) */
738 struct list_head a_list
; /* member in app list */
739 int type
; /* IP_VS_APP_TYPE_xxx */
740 char *name
; /* application module name */
742 struct module
*module
; /* THIS_MODULE/NULL */
743 struct list_head incs_list
; /* list of incarnations */
745 /* members for application incarnations */
746 struct list_head p_list
; /* member in proto app list */
747 struct ip_vs_app
*app
; /* its real application */
748 __be16 port
; /* port number in net order */
749 atomic_t usecnt
; /* usage counter */
750 struct rcu_head rcu_head
;
752 /* output hook: Process packet in inout direction, diff set for TCP.
753 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
754 * 2=Mangled but checksum was not updated
756 int (*pkt_out
)(struct ip_vs_app
*, struct ip_vs_conn
*,
757 struct sk_buff
*, int *diff
, struct ip_vs_iphdr
*ipvsh
);
759 /* input hook: Process packet in outin 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_in
)(struct ip_vs_app
*, struct ip_vs_conn
*,
764 struct sk_buff
*, int *diff
, struct ip_vs_iphdr
*ipvsh
);
766 /* ip_vs_app initializer */
767 int (*init_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*);
769 /* ip_vs_app finish */
770 int (*done_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*);
774 int (*bind_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*,
775 struct ip_vs_protocol
*);
777 void (*unbind_conn
)(struct ip_vs_app
*, struct ip_vs_conn
*);
783 int (*conn_schedule
)(struct sk_buff
*skb
, struct ip_vs_app
*app
,
784 int *verdict
, struct ip_vs_conn
**cpp
);
787 (*conn_in_get
)(const struct sk_buff
*skb
, struct ip_vs_app
*app
,
788 const struct iphdr
*iph
, int inverse
);
791 (*conn_out_get
)(const struct sk_buff
*skb
, struct ip_vs_app
*app
,
792 const struct iphdr
*iph
, int inverse
);
794 int (*state_transition
)(struct ip_vs_conn
*cp
, int direction
,
795 const struct sk_buff
*skb
,
796 struct ip_vs_app
*app
);
798 void (*timeout_change
)(struct ip_vs_app
*app
, int flags
);
801 struct ipvs_master_sync_state
{
802 struct list_head sync_queue
;
803 struct ip_vs_sync_buff
*sync_buff
;
804 unsigned long sync_queue_len
;
805 unsigned int sync_queue_delay
;
806 struct task_struct
*master_thread
;
807 struct delayed_work master_wakeup_work
;
808 struct netns_ipvs
*ipvs
;
811 /* How much time to keep dests in trash */
812 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
814 struct ipvs_sync_daemon_cfg
{
815 union nf_inet_addr mcast_group
;
821 /* multicast interface name */
822 char mcast_ifn
[IP_VS_IFNAME_MAXLEN
];
825 /* IPVS in network namespace */
827 int gen
; /* Generation */
828 int enable
; /* enable like nf_hooks do */
829 /* Hash table: for real service lookups */
830 #define IP_VS_RTAB_BITS 4
831 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
832 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
834 struct hlist_head rs_table
[IP_VS_RTAB_SIZE
];
836 struct list_head app_list
;
838 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
839 struct ip_vs_proto_data
*proto_data_table
[IP_VS_PROTO_TAB_SIZE
];
840 /* ip_vs_proto_tcp */
841 #ifdef CONFIG_IP_VS_PROTO_TCP
842 #define TCP_APP_TAB_BITS 4
843 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
844 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
845 struct list_head tcp_apps
[TCP_APP_TAB_SIZE
];
847 /* ip_vs_proto_udp */
848 #ifdef CONFIG_IP_VS_PROTO_UDP
849 #define UDP_APP_TAB_BITS 4
850 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
851 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
852 struct list_head udp_apps
[UDP_APP_TAB_SIZE
];
854 /* ip_vs_proto_sctp */
855 #ifdef CONFIG_IP_VS_PROTO_SCTP
856 #define SCTP_APP_TAB_BITS 4
857 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
858 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
859 /* Hash table for SCTP application incarnations */
860 struct list_head sctp_apps
[SCTP_APP_TAB_SIZE
];
863 atomic_t conn_count
; /* connection counter */
866 struct ip_vs_stats tot_stats
; /* Statistics & est. */
868 int num_services
; /* no of virtual services */
870 /* Trash for destinations */
871 struct list_head dest_trash
;
872 spinlock_t dest_trash_lock
;
873 struct timer_list dest_trash_timer
; /* expiration timer */
874 /* Service counters */
875 atomic_t ftpsvc_counter
;
876 atomic_t nullsvc_counter
;
877 atomic_t conn_out_counter
;
880 /* 1/rate drop and drop-entry variables */
881 struct delayed_work defense_work
; /* Work handler */
886 spinlock_t dropentry_lock
; /* drop entry handling */
887 spinlock_t droppacket_lock
; /* drop packet handling */
888 spinlock_t securetcp_lock
; /* state and timeout tables */
891 struct ctl_table_header
*sysctl_hdr
;
892 struct ctl_table
*sysctl_tbl
;
895 /* sysctl variables */
896 int sysctl_amemthresh
;
897 int sysctl_am_droprate
;
898 int sysctl_drop_entry
;
899 int sysctl_drop_packet
;
900 int sysctl_secure_tcp
;
901 #ifdef CONFIG_IP_VS_NFCT
902 int sysctl_conntrack
;
904 int sysctl_snat_reroute
;
906 int sysctl_sync_ports
;
907 int sysctl_sync_persist_mode
;
908 unsigned long sysctl_sync_qlen_max
;
909 int sysctl_sync_sock_size
;
910 int sysctl_cache_bypass
;
911 int sysctl_expire_nodest_conn
;
912 int sysctl_sloppy_tcp
;
913 int sysctl_sloppy_sctp
;
914 int sysctl_expire_quiescent_template
;
915 int sysctl_sync_threshold
[2];
916 unsigned int sysctl_sync_refresh_period
;
917 int sysctl_sync_retries
;
918 int sysctl_nat_icmp_send
;
919 int sysctl_pmtu_disc
;
920 int sysctl_backup_only
;
921 int sysctl_conn_reuse_mode
;
922 int sysctl_schedule_icmp
;
923 int sysctl_ignore_tunneled
;
926 int sysctl_lblc_expiration
;
927 struct ctl_table_header
*lblc_ctl_header
;
928 struct ctl_table
*lblc_ctl_table
;
930 int sysctl_lblcr_expiration
;
931 struct ctl_table_header
*lblcr_ctl_header
;
932 struct ctl_table
*lblcr_ctl_table
;
934 struct list_head est_list
; /* estimator list */
936 struct timer_list est_timer
; /* Estimation timer */
938 spinlock_t sync_lock
;
939 struct ipvs_master_sync_state
*ms
;
940 spinlock_t sync_buff_lock
;
941 struct task_struct
**backup_threads
;
943 volatile int sync_state
;
944 struct mutex sync_mutex
;
945 struct ipvs_sync_daemon_cfg mcfg
; /* Master Configuration */
946 struct ipvs_sync_daemon_cfg bcfg
; /* Backup Configuration */
947 /* net name space ptr */
948 struct net
*net
; /* Needed by timer routines */
949 /* Number of heterogeneous destinations, needed becaus heterogeneous
950 * are not supported when synchronization is enabled.
952 unsigned int mixed_address_family_dests
;
955 #define DEFAULT_SYNC_THRESHOLD 3
956 #define DEFAULT_SYNC_PERIOD 50
957 #define DEFAULT_SYNC_VER 1
958 #define DEFAULT_SLOPPY_TCP 0
959 #define DEFAULT_SLOPPY_SCTP 0
960 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
961 #define DEFAULT_SYNC_RETRIES 0
962 #define IPVS_SYNC_WAKEUP_RATE 8
963 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
964 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
965 #define IPVS_SYNC_CHECK_PERIOD HZ
966 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
967 #define IPVS_SYNC_PORTS_MAX (1 << 6)
971 static inline int sysctl_sync_threshold(struct netns_ipvs
*ipvs
)
973 return ipvs
->sysctl_sync_threshold
[0];
976 static inline int sysctl_sync_period(struct netns_ipvs
*ipvs
)
978 return READ_ONCE(ipvs
->sysctl_sync_threshold
[1]);
981 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs
*ipvs
)
983 return READ_ONCE(ipvs
->sysctl_sync_refresh_period
);
986 static inline int sysctl_sync_retries(struct netns_ipvs
*ipvs
)
988 return ipvs
->sysctl_sync_retries
;
991 static inline int sysctl_sync_ver(struct netns_ipvs
*ipvs
)
993 return ipvs
->sysctl_sync_ver
;
996 static inline int sysctl_sloppy_tcp(struct netns_ipvs
*ipvs
)
998 return ipvs
->sysctl_sloppy_tcp
;
1001 static inline int sysctl_sloppy_sctp(struct netns_ipvs
*ipvs
)
1003 return ipvs
->sysctl_sloppy_sctp
;
1006 static inline int sysctl_sync_ports(struct netns_ipvs
*ipvs
)
1008 return READ_ONCE(ipvs
->sysctl_sync_ports
);
1011 static inline int sysctl_sync_persist_mode(struct netns_ipvs
*ipvs
)
1013 return ipvs
->sysctl_sync_persist_mode
;
1016 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs
*ipvs
)
1018 return ipvs
->sysctl_sync_qlen_max
;
1021 static inline int sysctl_sync_sock_size(struct netns_ipvs
*ipvs
)
1023 return ipvs
->sysctl_sync_sock_size
;
1026 static inline int sysctl_pmtu_disc(struct netns_ipvs
*ipvs
)
1028 return ipvs
->sysctl_pmtu_disc
;
1031 static inline int sysctl_backup_only(struct netns_ipvs
*ipvs
)
1033 return ipvs
->sync_state
& IP_VS_STATE_BACKUP
&&
1034 ipvs
->sysctl_backup_only
;
1037 static inline int sysctl_conn_reuse_mode(struct netns_ipvs
*ipvs
)
1039 return ipvs
->sysctl_conn_reuse_mode
;
1042 static inline int sysctl_schedule_icmp(struct netns_ipvs
*ipvs
)
1044 return ipvs
->sysctl_schedule_icmp
;
1047 static inline int sysctl_ignore_tunneled(struct netns_ipvs
*ipvs
)
1049 return ipvs
->sysctl_ignore_tunneled
;
1052 static inline int sysctl_cache_bypass(struct netns_ipvs
*ipvs
)
1054 return ipvs
->sysctl_cache_bypass
;
1059 static inline int sysctl_sync_threshold(struct netns_ipvs
*ipvs
)
1061 return DEFAULT_SYNC_THRESHOLD
;
1064 static inline int sysctl_sync_period(struct netns_ipvs
*ipvs
)
1066 return DEFAULT_SYNC_PERIOD
;
1069 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs
*ipvs
)
1071 return DEFAULT_SYNC_REFRESH_PERIOD
;
1074 static inline int sysctl_sync_retries(struct netns_ipvs
*ipvs
)
1076 return DEFAULT_SYNC_RETRIES
& 3;
1079 static inline int sysctl_sync_ver(struct netns_ipvs
*ipvs
)
1081 return DEFAULT_SYNC_VER
;
1084 static inline int sysctl_sloppy_tcp(struct netns_ipvs
*ipvs
)
1086 return DEFAULT_SLOPPY_TCP
;
1089 static inline int sysctl_sloppy_sctp(struct netns_ipvs
*ipvs
)
1091 return DEFAULT_SLOPPY_SCTP
;
1094 static inline int sysctl_sync_ports(struct netns_ipvs
*ipvs
)
1099 static inline int sysctl_sync_persist_mode(struct netns_ipvs
*ipvs
)
1104 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs
*ipvs
)
1106 return IPVS_SYNC_QLEN_MAX
;
1109 static inline int sysctl_sync_sock_size(struct netns_ipvs
*ipvs
)
1114 static inline int sysctl_pmtu_disc(struct netns_ipvs
*ipvs
)
1119 static inline int sysctl_backup_only(struct netns_ipvs
*ipvs
)
1124 static inline int sysctl_conn_reuse_mode(struct netns_ipvs
*ipvs
)
1129 static inline int sysctl_schedule_icmp(struct netns_ipvs
*ipvs
)
1134 static inline int sysctl_ignore_tunneled(struct netns_ipvs
*ipvs
)
1139 static inline int sysctl_cache_bypass(struct netns_ipvs
*ipvs
)
1146 /* IPVS core functions
1147 * (from ip_vs_core.c)
1149 const char *ip_vs_proto_name(unsigned int proto
);
1150 void ip_vs_init_hash_table(struct list_head
*table
, int rows
);
1151 struct ip_vs_conn
*ip_vs_new_conn_out(struct ip_vs_service
*svc
,
1152 struct ip_vs_dest
*dest
,
1153 struct sk_buff
*skb
,
1154 const struct ip_vs_iphdr
*iph
,
1157 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1159 #define IP_VS_APP_TYPE_FTP 1
1161 /* ip_vs_conn handling functions
1162 * (from ip_vs_conn.c)
1165 IP_VS_DIR_INPUT
= 0,
1167 IP_VS_DIR_INPUT_ONLY
,
1171 static inline void ip_vs_conn_fill_param(struct netns_ipvs
*ipvs
, int af
, int protocol
,
1172 const union nf_inet_addr
*caddr
,
1174 const union nf_inet_addr
*vaddr
,
1176 struct ip_vs_conn_param
*p
)
1180 p
->protocol
= protocol
;
1189 struct ip_vs_conn
*ip_vs_conn_in_get(const struct ip_vs_conn_param
*p
);
1190 struct ip_vs_conn
*ip_vs_ct_in_get(const struct ip_vs_conn_param
*p
);
1192 struct ip_vs_conn
* ip_vs_conn_in_get_proto(struct netns_ipvs
*ipvs
, int af
,
1193 const struct sk_buff
*skb
,
1194 const struct ip_vs_iphdr
*iph
);
1196 struct ip_vs_conn
*ip_vs_conn_out_get(const struct ip_vs_conn_param
*p
);
1198 struct ip_vs_conn
* ip_vs_conn_out_get_proto(struct netns_ipvs
*ipvs
, int af
,
1199 const struct sk_buff
*skb
,
1200 const struct ip_vs_iphdr
*iph
);
1202 /* Get reference to gain full access to conn.
1203 * By default, RCU read-side critical sections have access only to
1204 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1206 static inline bool __ip_vs_conn_get(struct ip_vs_conn
*cp
)
1208 return refcount_inc_not_zero(&cp
->refcnt
);
1211 /* put back the conn without restarting its timer */
1212 static inline void __ip_vs_conn_put(struct ip_vs_conn
*cp
)
1214 smp_mb__before_atomic();
1215 refcount_dec(&cp
->refcnt
);
1217 void ip_vs_conn_put(struct ip_vs_conn
*cp
);
1218 void ip_vs_conn_fill_cport(struct ip_vs_conn
*cp
, __be16 cport
);
1220 struct ip_vs_conn
*ip_vs_conn_new(const struct ip_vs_conn_param
*p
, int dest_af
,
1221 const union nf_inet_addr
*daddr
,
1222 __be16 dport
, unsigned int flags
,
1223 struct ip_vs_dest
*dest
, __u32 fwmark
);
1224 void ip_vs_conn_expire_now(struct ip_vs_conn
*cp
);
1226 const char *ip_vs_state_name(const struct ip_vs_conn
*cp
);
1228 void ip_vs_tcp_conn_listen(struct ip_vs_conn
*cp
);
1229 int ip_vs_check_template(struct ip_vs_conn
*ct
, struct ip_vs_dest
*cdest
);
1230 void ip_vs_random_dropentry(struct netns_ipvs
*ipvs
);
1231 int ip_vs_conn_init(void);
1232 void ip_vs_conn_cleanup(void);
1234 static inline void ip_vs_control_del(struct ip_vs_conn
*cp
)
1236 struct ip_vs_conn
*ctl_cp
= cp
->control
;
1238 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1240 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
),
1242 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
),
1248 IP_VS_DBG_BUF(7, "DELeting control for: "
1249 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1250 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
),
1252 IP_VS_DBG_ADDR(cp
->af
, &ctl_cp
->caddr
),
1253 ntohs(ctl_cp
->cport
));
1256 if (atomic_read(&ctl_cp
->n_control
) == 0) {
1257 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1259 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
),
1261 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
),
1266 atomic_dec(&ctl_cp
->n_control
);
1270 ip_vs_control_add(struct ip_vs_conn
*cp
, struct ip_vs_conn
*ctl_cp
)
1273 IP_VS_ERR_BUF("request control ADD for already controlled: "
1275 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
),
1277 IP_VS_DBG_ADDR(cp
->af
, &cp
->vaddr
),
1280 ip_vs_control_del(cp
);
1283 IP_VS_DBG_BUF(7, "ADDing control for: "
1284 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1285 IP_VS_DBG_ADDR(cp
->af
, &cp
->caddr
),
1287 IP_VS_DBG_ADDR(cp
->af
, &ctl_cp
->caddr
),
1288 ntohs(ctl_cp
->cport
));
1290 cp
->control
= ctl_cp
;
1291 atomic_inc(&ctl_cp
->n_control
);
1294 /* Mark our template as assured */
1296 ip_vs_control_assure_ct(struct ip_vs_conn
*cp
)
1298 struct ip_vs_conn
*ct
= cp
->control
;
1300 if (ct
&& !(ct
->state
& IP_VS_CTPL_S_ASSURED
) &&
1301 (ct
->flags
& IP_VS_CONN_F_TEMPLATE
))
1302 ct
->state
|= IP_VS_CTPL_S_ASSURED
;
1305 /* IPVS netns init & cleanup functions */
1306 int ip_vs_estimator_net_init(struct netns_ipvs
*ipvs
);
1307 int ip_vs_control_net_init(struct netns_ipvs
*ipvs
);
1308 int ip_vs_protocol_net_init(struct netns_ipvs
*ipvs
);
1309 int ip_vs_app_net_init(struct netns_ipvs
*ipvs
);
1310 int ip_vs_conn_net_init(struct netns_ipvs
*ipvs
);
1311 int ip_vs_sync_net_init(struct netns_ipvs
*ipvs
);
1312 void ip_vs_conn_net_cleanup(struct netns_ipvs
*ipvs
);
1313 void ip_vs_app_net_cleanup(struct netns_ipvs
*ipvs
);
1314 void ip_vs_protocol_net_cleanup(struct netns_ipvs
*ipvs
);
1315 void ip_vs_control_net_cleanup(struct netns_ipvs
*ipvs
);
1316 void ip_vs_estimator_net_cleanup(struct netns_ipvs
*ipvs
);
1317 void ip_vs_sync_net_cleanup(struct netns_ipvs
*ipvs
);
1318 void ip_vs_service_net_cleanup(struct netns_ipvs
*ipvs
);
1320 /* IPVS application functions
1321 * (from ip_vs_app.c)
1323 #define IP_VS_APP_MAX_PORTS 8
1324 struct ip_vs_app
*register_ip_vs_app(struct netns_ipvs
*ipvs
, struct ip_vs_app
*app
);
1325 void unregister_ip_vs_app(struct netns_ipvs
*ipvs
, struct ip_vs_app
*app
);
1326 int ip_vs_bind_app(struct ip_vs_conn
*cp
, struct ip_vs_protocol
*pp
);
1327 void ip_vs_unbind_app(struct ip_vs_conn
*cp
);
1328 int register_ip_vs_app_inc(struct netns_ipvs
*ipvs
, struct ip_vs_app
*app
, __u16 proto
,
1330 int ip_vs_app_inc_get(struct ip_vs_app
*inc
);
1331 void ip_vs_app_inc_put(struct ip_vs_app
*inc
);
1333 int ip_vs_app_pkt_out(struct ip_vs_conn
*, struct sk_buff
*skb
,
1334 struct ip_vs_iphdr
*ipvsh
);
1335 int ip_vs_app_pkt_in(struct ip_vs_conn
*, struct sk_buff
*skb
,
1336 struct ip_vs_iphdr
*ipvsh
);
1338 int register_ip_vs_pe(struct ip_vs_pe
*pe
);
1339 int unregister_ip_vs_pe(struct ip_vs_pe
*pe
);
1340 struct ip_vs_pe
*ip_vs_pe_getbyname(const char *name
);
1341 struct ip_vs_pe
*__ip_vs_pe_getbyname(const char *pe_name
);
1343 /* Use a #define to avoid all of module.h just for these trivial ops */
1344 #define ip_vs_pe_get(pe) \
1345 if (pe && pe->module) \
1346 __module_get(pe->module);
1348 #define ip_vs_pe_put(pe) \
1349 if (pe && pe->module) \
1350 module_put(pe->module);
1352 /* IPVS protocol functions (from ip_vs_proto.c) */
1353 int ip_vs_protocol_init(void);
1354 void ip_vs_protocol_cleanup(void);
1355 void ip_vs_protocol_timeout_change(struct netns_ipvs
*ipvs
, int flags
);
1356 int *ip_vs_create_timeout_table(int *table
, int size
);
1357 void ip_vs_tcpudp_debug_packet(int af
, struct ip_vs_protocol
*pp
,
1358 const struct sk_buff
*skb
, int offset
,
1361 extern struct ip_vs_protocol ip_vs_protocol_tcp
;
1362 extern struct ip_vs_protocol ip_vs_protocol_udp
;
1363 extern struct ip_vs_protocol ip_vs_protocol_icmp
;
1364 extern struct ip_vs_protocol ip_vs_protocol_esp
;
1365 extern struct ip_vs_protocol ip_vs_protocol_ah
;
1366 extern struct ip_vs_protocol ip_vs_protocol_sctp
;
1368 /* Registering/unregistering scheduler functions
1369 * (from ip_vs_sched.c)
1371 int register_ip_vs_scheduler(struct ip_vs_scheduler
*scheduler
);
1372 int unregister_ip_vs_scheduler(struct ip_vs_scheduler
*scheduler
);
1373 int ip_vs_bind_scheduler(struct ip_vs_service
*svc
,
1374 struct ip_vs_scheduler
*scheduler
);
1375 void ip_vs_unbind_scheduler(struct ip_vs_service
*svc
,
1376 struct ip_vs_scheduler
*sched
);
1377 struct ip_vs_scheduler
*ip_vs_scheduler_get(const char *sched_name
);
1378 void ip_vs_scheduler_put(struct ip_vs_scheduler
*scheduler
);
1380 ip_vs_schedule(struct ip_vs_service
*svc
, struct sk_buff
*skb
,
1381 struct ip_vs_proto_data
*pd
, int *ignored
,
1382 struct ip_vs_iphdr
*iph
);
1383 int ip_vs_leave(struct ip_vs_service
*svc
, struct sk_buff
*skb
,
1384 struct ip_vs_proto_data
*pd
, struct ip_vs_iphdr
*iph
);
1386 void ip_vs_scheduler_err(struct ip_vs_service
*svc
, const char *msg
);
1388 /* IPVS control data and functions (from ip_vs_ctl.c) */
1389 extern struct ip_vs_stats ip_vs_stats
;
1390 extern int sysctl_ip_vs_sync_ver
;
1392 struct ip_vs_service
*
1393 ip_vs_service_find(struct netns_ipvs
*ipvs
, int af
, __u32 fwmark
, __u16 protocol
,
1394 const union nf_inet_addr
*vaddr
, __be16 vport
);
1396 bool ip_vs_has_real_service(struct netns_ipvs
*ipvs
, int af
, __u16 protocol
,
1397 const union nf_inet_addr
*daddr
, __be16 dport
);
1400 ip_vs_find_real_service(struct netns_ipvs
*ipvs
, int af
, __u16 protocol
,
1401 const union nf_inet_addr
*daddr
, __be16 dport
);
1403 int ip_vs_use_count_inc(void);
1404 void ip_vs_use_count_dec(void);
1405 int ip_vs_register_nl_ioctl(void);
1406 void ip_vs_unregister_nl_ioctl(void);
1407 int ip_vs_control_init(void);
1408 void ip_vs_control_cleanup(void);
1410 ip_vs_find_dest(struct netns_ipvs
*ipvs
, int svc_af
, int dest_af
,
1411 const union nf_inet_addr
*daddr
, __be16 dport
,
1412 const union nf_inet_addr
*vaddr
, __be16 vport
,
1413 __u16 protocol
, __u32 fwmark
, __u32 flags
);
1414 void ip_vs_try_bind_dest(struct ip_vs_conn
*cp
);
1416 static inline void ip_vs_dest_hold(struct ip_vs_dest
*dest
)
1418 refcount_inc(&dest
->refcnt
);
1421 static inline void ip_vs_dest_put(struct ip_vs_dest
*dest
)
1423 smp_mb__before_atomic();
1424 refcount_dec(&dest
->refcnt
);
1427 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest
*dest
)
1429 if (refcount_dec_and_test(&dest
->refcnt
))
1433 /* IPVS sync daemon data and function prototypes
1434 * (from ip_vs_sync.c)
1436 int start_sync_thread(struct netns_ipvs
*ipvs
, struct ipvs_sync_daemon_cfg
*cfg
,
1438 int stop_sync_thread(struct netns_ipvs
*ipvs
, int state
);
1439 void ip_vs_sync_conn(struct netns_ipvs
*ipvs
, struct ip_vs_conn
*cp
, int pkts
);
1441 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1442 void ip_vs_start_estimator(struct netns_ipvs
*ipvs
, struct ip_vs_stats
*stats
);
1443 void ip_vs_stop_estimator(struct netns_ipvs
*ipvs
, struct ip_vs_stats
*stats
);
1444 void ip_vs_zero_estimator(struct ip_vs_stats
*stats
);
1445 void ip_vs_read_estimator(struct ip_vs_kstats
*dst
, struct ip_vs_stats
*stats
);
1447 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1448 int ip_vs_null_xmit(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1449 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1450 int ip_vs_bypass_xmit(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1451 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1452 int ip_vs_nat_xmit(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1453 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1454 int ip_vs_tunnel_xmit(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1455 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1456 int ip_vs_dr_xmit(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1457 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1458 int ip_vs_icmp_xmit(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1459 struct ip_vs_protocol
*pp
, int offset
,
1460 unsigned int hooknum
, struct ip_vs_iphdr
*iph
);
1461 void ip_vs_dest_dst_rcu_free(struct rcu_head
*head
);
1463 #ifdef CONFIG_IP_VS_IPV6
1464 int ip_vs_bypass_xmit_v6(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1465 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1466 int ip_vs_nat_xmit_v6(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1467 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1468 int ip_vs_tunnel_xmit_v6(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1469 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1470 int ip_vs_dr_xmit_v6(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1471 struct ip_vs_protocol
*pp
, struct ip_vs_iphdr
*iph
);
1472 int ip_vs_icmp_xmit_v6(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1473 struct ip_vs_protocol
*pp
, int offset
,
1474 unsigned int hooknum
, struct ip_vs_iphdr
*iph
);
1477 #ifdef CONFIG_SYSCTL
1478 /* This is a simple mechanism to ignore packets when
1479 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1480 * we start to drop 1/rate of the packets
1482 static inline int ip_vs_todrop(struct netns_ipvs
*ipvs
)
1484 if (!ipvs
->drop_rate
)
1486 if (--ipvs
->drop_counter
> 0)
1488 ipvs
->drop_counter
= ipvs
->drop_rate
;
1492 static inline int ip_vs_todrop(struct netns_ipvs
*ipvs
) { return 0; }
1495 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1496 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1498 static inline char ip_vs_fwd_tag(struct ip_vs_conn
*cp
)
1502 switch (IP_VS_FWD_METHOD(cp
)) {
1503 case IP_VS_CONN_F_MASQ
:
1505 case IP_VS_CONN_F_LOCALNODE
:
1507 case IP_VS_CONN_F_TUNNEL
:
1509 case IP_VS_CONN_F_DROUTE
:
1511 case IP_VS_CONN_F_BYPASS
:
1519 void ip_vs_nat_icmp(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
1520 struct ip_vs_conn
*cp
, int dir
);
1522 #ifdef CONFIG_IP_VS_IPV6
1523 void ip_vs_nat_icmp_v6(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
1524 struct ip_vs_conn
*cp
, int dir
);
1527 __sum16
ip_vs_checksum_complete(struct sk_buff
*skb
, int offset
);
1529 static inline __wsum
ip_vs_check_diff4(__be32 old
, __be32
new, __wsum oldsum
)
1531 __be32 diff
[2] = { ~old
, new };
1533 return csum_partial(diff
, sizeof(diff
), oldsum
);
1536 #ifdef CONFIG_IP_VS_IPV6
1537 static inline __wsum
ip_vs_check_diff16(const __be32
*old
, const __be32
*new,
1540 __be32 diff
[8] = { ~old
[3], ~old
[2], ~old
[1], ~old
[0],
1541 new[3], new[2], new[1], new[0] };
1543 return csum_partial(diff
, sizeof(diff
), oldsum
);
1547 static inline __wsum
ip_vs_check_diff2(__be16 old
, __be16
new, __wsum oldsum
)
1549 __be16 diff
[2] = { ~old
, new };
1551 return csum_partial(diff
, sizeof(diff
), oldsum
);
1554 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1555 static inline void ip_vs_notrack(struct sk_buff
*skb
)
1557 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1558 enum ip_conntrack_info ctinfo
;
1559 struct nf_conn
*ct
= nf_ct_get(skb
, &ctinfo
);
1562 nf_conntrack_put(&ct
->ct_general
);
1563 nf_ct_set(skb
, NULL
, IP_CT_UNTRACKED
);
1568 #ifdef CONFIG_IP_VS_NFCT
1569 /* Netfilter connection tracking
1570 * (from ip_vs_nfct.c)
1572 static inline int ip_vs_conntrack_enabled(struct netns_ipvs
*ipvs
)
1574 #ifdef CONFIG_SYSCTL
1575 return ipvs
->sysctl_conntrack
;
1581 void ip_vs_update_conntrack(struct sk_buff
*skb
, struct ip_vs_conn
*cp
,
1583 int ip_vs_confirm_conntrack(struct sk_buff
*skb
);
1584 void ip_vs_nfct_expect_related(struct sk_buff
*skb
, struct nf_conn
*ct
,
1585 struct ip_vs_conn
*cp
, u_int8_t proto
,
1586 const __be16 port
, int from_rs
);
1587 void ip_vs_conn_drop_conntrack(struct ip_vs_conn
*cp
);
1591 static inline int ip_vs_conntrack_enabled(struct netns_ipvs
*ipvs
)
1596 static inline void ip_vs_update_conntrack(struct sk_buff
*skb
,
1597 struct ip_vs_conn
*cp
, int outin
)
1601 static inline int ip_vs_confirm_conntrack(struct sk_buff
*skb
)
1606 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn
*cp
)
1609 #endif /* CONFIG_IP_VS_NFCT */
1611 /* Really using conntrack? */
1612 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn
*cp
,
1613 struct sk_buff
*skb
)
1615 #ifdef CONFIG_IP_VS_NFCT
1616 enum ip_conntrack_info ctinfo
;
1619 if (!(cp
->flags
& IP_VS_CONN_F_NFCT
))
1621 ct
= nf_ct_get(skb
, &ctinfo
);
1628 static inline int ip_vs_register_conntrack(struct ip_vs_service
*svc
)
1630 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1631 int afmask
= (svc
->af
== AF_INET6
) ? 2 : 1;
1634 if (!(svc
->conntrack_afmask
& afmask
)) {
1635 ret
= nf_ct_netns_get(svc
->ipvs
->net
, svc
->af
);
1637 svc
->conntrack_afmask
|= afmask
;
1645 static inline void ip_vs_unregister_conntrack(struct ip_vs_service
*svc
)
1647 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1648 int afmask
= (svc
->af
== AF_INET6
) ? 2 : 1;
1650 if (svc
->conntrack_afmask
& afmask
) {
1651 nf_ct_netns_put(svc
->ipvs
->net
, svc
->af
);
1652 svc
->conntrack_afmask
&= ~afmask
;
1658 ip_vs_dest_conn_overhead(struct ip_vs_dest
*dest
)
1660 /* We think the overhead of processing active connections is 256
1661 * times higher than that of inactive connections in average. (This
1662 * 256 times might not be accurate, we will change it later) We
1663 * use the following formula to estimate the overhead now:
1664 * dest->activeconns*256 + dest->inactconns
1666 return (atomic_read(&dest
->activeconns
) << 8) +
1667 atomic_read(&dest
->inactconns
);
1670 #endif /* _NET_IP_VS_H */