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 /* Delta sequence info structure
339 * Each ip_vs_conn has 2 (output AND input seq. changes).
340 * Only used in the VS/NAT.
343 __u32 init_seq; /* Add delta from this seq */
344 __u32 delta; /* Delta in sequence numbers */
345 __u32 previous_delta; /* Delta in sequence numbers
346 * before last resized pkt */
349 /* counters per cpu */
350 struct ip_vs_counters {
351 __u64 conns; /* connections scheduled */
352 __u64 inpkts; /* incoming packets */
353 __u64 outpkts; /* outgoing packets */
354 __u64 inbytes; /* incoming bytes */
355 __u64 outbytes; /* outgoing bytes */
358 struct ip_vs_cpu_stats {
359 struct ip_vs_counters cnt;
360 struct u64_stats_sync syncp;
363 /* IPVS statistics objects */
364 struct ip_vs_estimator {
365 struct list_head list;
381 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
383 struct ip_vs_kstats {
384 u64 conns; /* connections scheduled */
385 u64 inpkts; /* incoming packets */
386 u64 outpkts; /* outgoing packets */
387 u64 inbytes; /* incoming bytes */
388 u64 outbytes; /* outgoing bytes */
390 u64 cps; /* current connection rate */
391 u64 inpps; /* current in packet rate */
392 u64 outpps; /* current out packet rate */
393 u64 inbps; /* current in byte rate */
394 u64 outbps; /* current out byte rate */
398 struct ip_vs_kstats kstats; /* kernel statistics */
399 struct ip_vs_estimator est; /* estimator */
400 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
401 spinlock_t lock; /* spin lock */
402 struct ip_vs_kstats kstats0; /* reset values */
410 struct ip_vs_proto_data;
412 struct ip_vs_protocol {
413 struct ip_vs_protocol *next;
419 void (*init)(struct ip_vs_protocol *pp);
421 void (*exit)(struct ip_vs_protocol *pp);
423 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
425 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
427 int (*conn_schedule)(struct netns_ipvs *ipvs,
428 int af, struct sk_buff *skb,
429 struct ip_vs_proto_data *pd,
430 int *verdict, struct ip_vs_conn **cpp,
431 struct ip_vs_iphdr *iph);
434 (*conn_in_get)(struct netns_ipvs *ipvs,
436 const struct sk_buff *skb,
437 const struct ip_vs_iphdr *iph);
440 (*conn_out_get)(struct netns_ipvs *ipvs,
442 const struct sk_buff *skb,
443 const struct ip_vs_iphdr *iph);
445 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
446 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
448 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
449 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
451 int (*csum_check)(int af, struct sk_buff *skb,
452 struct ip_vs_protocol *pp);
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 */
605 * The information about the virtual service offered to the net and the
606 * forwarding entries.
608 struct ip_vs_service {
609 struct hlist_node s_list; /* for normal service table */
610 struct hlist_node f_list; /* for fwmark-based service table */
611 atomic_t refcnt; /* reference counter */
613 u16 af; /* address family */
614 __u16 protocol; /* which protocol (TCP/UDP) */
615 union nf_inet_addr addr; /* IP address for virtual service */
616 __be16 port; /* port number for the service */
617 __u32 fwmark; /* firewall mark of the service */
618 unsigned int flags; /* service status flags */
619 unsigned int timeout; /* persistent timeout in ticks */
620 __be32 netmask; /* grouping granularity, mask/plen */
621 struct netns_ipvs *ipvs;
623 struct list_head destinations; /* real server d-linked list */
624 __u32 num_dests; /* number of servers */
625 struct ip_vs_stats stats; /* statistics for the service */
628 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
629 spinlock_t sched_lock; /* lock sched_data */
630 void *sched_data; /* scheduler application data */
632 /* alternate persistence engine */
633 struct ip_vs_pe __rcu *pe;
634 int conntrack_afmask;
636 struct rcu_head rcu_head;
639 /* Information for cached dst */
640 struct ip_vs_dest_dst {
641 struct dst_entry *dst_cache; /* destination cache entry */
643 union nf_inet_addr dst_saddr;
644 struct rcu_head rcu_head;
647 /* The real server destination forwarding entry with ip address, port number,
651 struct list_head n_list; /* for the dests in the service */
652 struct hlist_node d_list; /* for table with all the dests */
654 u16 af; /* address family */
655 __be16 port; /* port number of the server */
656 union nf_inet_addr addr; /* IP address of the server */
657 volatile unsigned int flags; /* dest status flags */
658 atomic_t conn_flags; /* flags to copy to conn */
659 atomic_t weight; /* server weight */
660 atomic_t last_weight; /* server latest weight */
662 refcount_t refcnt; /* reference counter */
663 struct ip_vs_stats stats; /* statistics */
664 unsigned long idle_start; /* start time, jiffies */
666 /* connection counters and thresholds */
667 atomic_t activeconns; /* active connections */
668 atomic_t inactconns; /* inactive connections */
669 atomic_t persistconns; /* persistent connections */
670 __u32 u_threshold; /* upper threshold */
671 __u32 l_threshold; /* lower threshold */
673 /* for destination cache */
674 spinlock_t dst_lock; /* lock of dst_cache */
675 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
677 /* for virtual service */
678 struct ip_vs_service __rcu *svc; /* service it belongs to */
679 __u16 protocol; /* which protocol (TCP/UDP) */
680 __be16 vport; /* virtual port number */
681 union nf_inet_addr vaddr; /* virtual IP address */
682 __u32 vfwmark; /* firewall mark of service */
684 struct list_head t_list; /* in dest_trash */
685 unsigned int in_rs_table:1; /* we are in rs_table */
688 /* The scheduler object */
689 struct ip_vs_scheduler {
690 struct list_head n_list; /* d-linked list head */
691 char *name; /* scheduler name */
692 atomic_t refcnt; /* reference counter */
693 struct module *module; /* THIS_MODULE/NULL */
695 /* scheduler initializing service */
696 int (*init_service)(struct ip_vs_service *svc);
697 /* scheduling service finish */
698 void (*done_service)(struct ip_vs_service *svc);
700 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
701 /* dest is unlinked */
702 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
703 /* dest is updated */
704 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
706 /* selecting a server from the given service */
707 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
708 const struct sk_buff *skb,
709 struct ip_vs_iphdr *iph);
712 /* The persistence engine object */
714 struct list_head n_list; /* d-linked list head */
715 char *name; /* scheduler name */
716 atomic_t refcnt; /* reference counter */
717 struct module *module; /* THIS_MODULE/NULL */
719 /* get the connection template, if any */
720 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
721 bool (*ct_match)(const struct ip_vs_conn_param *p,
722 struct ip_vs_conn *ct);
723 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
725 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
726 /* create connections for real-server outgoing packets */
727 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
728 struct ip_vs_dest *dest,
730 const struct ip_vs_iphdr *iph,
731 __be16 dport, __be16 cport);
734 /* The application module object (a.k.a. app incarnation) */
736 struct list_head a_list; /* member in app list */
737 int type; /* IP_VS_APP_TYPE_xxx */
738 char *name; /* application module name */
740 struct module *module; /* THIS_MODULE/NULL */
741 struct list_head incs_list; /* list of incarnations */
743 /* members for application incarnations */
744 struct list_head p_list; /* member in proto app list */
745 struct ip_vs_app *app; /* its real application */
746 __be16 port; /* port number in net order */
747 atomic_t usecnt; /* usage counter */
748 struct rcu_head rcu_head;
750 /* output hook: Process packet in inout direction, diff set for TCP.
751 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
752 * 2=Mangled but checksum was not updated
754 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
755 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
757 /* input hook: Process packet in outin 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_in)(struct ip_vs_app *, struct ip_vs_conn *,
762 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
764 /* ip_vs_app initializer */
765 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
767 /* ip_vs_app finish */
768 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
772 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
773 struct ip_vs_protocol *);
775 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
781 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
782 int *verdict, struct ip_vs_conn **cpp);
785 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
786 const struct iphdr *iph, int inverse);
789 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
790 const struct iphdr *iph, int inverse);
792 int (*state_transition)(struct ip_vs_conn *cp, int direction,
793 const struct sk_buff *skb,
794 struct ip_vs_app *app);
796 void (*timeout_change)(struct ip_vs_app *app, int flags);
799 struct ipvs_master_sync_state {
800 struct list_head sync_queue;
801 struct ip_vs_sync_buff *sync_buff;
802 unsigned long sync_queue_len;
803 unsigned int sync_queue_delay;
804 struct task_struct *master_thread;
805 struct delayed_work master_wakeup_work;
806 struct netns_ipvs *ipvs;
809 /* How much time to keep dests in trash */
810 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
812 struct ipvs_sync_daemon_cfg {
813 union nf_inet_addr mcast_group;
819 /* multicast interface name */
820 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
823 /* IPVS in network namespace */
825 int gen; /* Generation */
826 int enable; /* enable like nf_hooks do */
827 /* Hash table: for real service lookups */
828 #define IP_VS_RTAB_BITS 4
829 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
830 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
832 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
834 struct list_head app_list;
836 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
837 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
838 /* ip_vs_proto_tcp */
839 #ifdef CONFIG_IP_VS_PROTO_TCP
840 #define TCP_APP_TAB_BITS 4
841 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
842 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
843 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
845 /* ip_vs_proto_udp */
846 #ifdef CONFIG_IP_VS_PROTO_UDP
847 #define UDP_APP_TAB_BITS 4
848 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
849 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
850 struct list_head udp_apps[UDP_APP_TAB_SIZE];
852 /* ip_vs_proto_sctp */
853 #ifdef CONFIG_IP_VS_PROTO_SCTP
854 #define SCTP_APP_TAB_BITS 4
855 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
856 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
857 /* Hash table for SCTP application incarnations */
858 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
861 atomic_t conn_count; /* connection counter */
864 struct ip_vs_stats tot_stats; /* Statistics & est. */
866 int num_services; /* no of virtual services */
868 /* Trash for destinations */
869 struct list_head dest_trash;
870 spinlock_t dest_trash_lock;
871 struct timer_list dest_trash_timer; /* expiration timer */
872 /* Service counters */
873 atomic_t ftpsvc_counter;
874 atomic_t nullsvc_counter;
875 atomic_t conn_out_counter;
878 /* 1/rate drop and drop-entry variables */
879 struct delayed_work defense_work; /* Work handler */
884 spinlock_t dropentry_lock; /* drop entry handling */
885 spinlock_t droppacket_lock; /* drop packet handling */
886 spinlock_t securetcp_lock; /* state and timeout tables */
889 struct ctl_table_header *sysctl_hdr;
890 struct ctl_table *sysctl_tbl;
893 /* sysctl variables */
894 int sysctl_amemthresh;
895 int sysctl_am_droprate;
896 int sysctl_drop_entry;
897 int sysctl_drop_packet;
898 int sysctl_secure_tcp;
899 #ifdef CONFIG_IP_VS_NFCT
900 int sysctl_conntrack;
902 int sysctl_snat_reroute;
904 int sysctl_sync_ports;
905 int sysctl_sync_persist_mode;
906 unsigned long sysctl_sync_qlen_max;
907 int sysctl_sync_sock_size;
908 int sysctl_cache_bypass;
909 int sysctl_expire_nodest_conn;
910 int sysctl_sloppy_tcp;
911 int sysctl_sloppy_sctp;
912 int sysctl_expire_quiescent_template;
913 int sysctl_sync_threshold[2];
914 unsigned int sysctl_sync_refresh_period;
915 int sysctl_sync_retries;
916 int sysctl_nat_icmp_send;
917 int sysctl_pmtu_disc;
918 int sysctl_backup_only;
919 int sysctl_conn_reuse_mode;
920 int sysctl_schedule_icmp;
921 int sysctl_ignore_tunneled;
924 int sysctl_lblc_expiration;
925 struct ctl_table_header *lblc_ctl_header;
926 struct ctl_table *lblc_ctl_table;
928 int sysctl_lblcr_expiration;
929 struct ctl_table_header *lblcr_ctl_header;
930 struct ctl_table *lblcr_ctl_table;
932 struct list_head est_list; /* estimator list */
934 struct timer_list est_timer; /* Estimation timer */
936 spinlock_t sync_lock;
937 struct ipvs_master_sync_state *ms;
938 spinlock_t sync_buff_lock;
939 struct task_struct **backup_threads;
941 volatile int sync_state;
942 struct mutex sync_mutex;
943 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
944 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
945 /* net name space ptr */
946 struct net *net; /* Needed by timer routines */
947 /* Number of heterogeneous destinations, needed becaus heterogeneous
948 * are not supported when synchronization is enabled.
950 unsigned int mixed_address_family_dests;
953 #define DEFAULT_SYNC_THRESHOLD 3
954 #define DEFAULT_SYNC_PERIOD 50
955 #define DEFAULT_SYNC_VER 1
956 #define DEFAULT_SLOPPY_TCP 0
957 #define DEFAULT_SLOPPY_SCTP 0
958 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
959 #define DEFAULT_SYNC_RETRIES 0
960 #define IPVS_SYNC_WAKEUP_RATE 8
961 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
962 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
963 #define IPVS_SYNC_CHECK_PERIOD HZ
964 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
965 #define IPVS_SYNC_PORTS_MAX (1 << 6)
969 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
971 return ipvs->sysctl_sync_threshold[0];
974 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
976 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
979 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
981 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
984 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
986 return ipvs->sysctl_sync_retries;
989 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
991 return ipvs->sysctl_sync_ver;
994 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
996 return ipvs->sysctl_sloppy_tcp;
999 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1001 return ipvs->sysctl_sloppy_sctp;
1004 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1006 return READ_ONCE(ipvs->sysctl_sync_ports);
1009 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1011 return ipvs->sysctl_sync_persist_mode;
1014 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1016 return ipvs->sysctl_sync_qlen_max;
1019 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1021 return ipvs->sysctl_sync_sock_size;
1024 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1026 return ipvs->sysctl_pmtu_disc;
1029 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1031 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1032 ipvs->sysctl_backup_only;
1035 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1037 return ipvs->sysctl_conn_reuse_mode;
1040 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1042 return ipvs->sysctl_schedule_icmp;
1045 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1047 return ipvs->sysctl_ignore_tunneled;
1050 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1052 return ipvs->sysctl_cache_bypass;
1057 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1059 return DEFAULT_SYNC_THRESHOLD;
1062 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1064 return DEFAULT_SYNC_PERIOD;
1067 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1069 return DEFAULT_SYNC_REFRESH_PERIOD;
1072 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1074 return DEFAULT_SYNC_RETRIES & 3;
1077 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1079 return DEFAULT_SYNC_VER;
1082 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1084 return DEFAULT_SLOPPY_TCP;
1087 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1089 return DEFAULT_SLOPPY_SCTP;
1092 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1097 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1102 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1104 return IPVS_SYNC_QLEN_MAX;
1107 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1112 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1117 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1122 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1127 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1132 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1137 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1144 /* IPVS core functions
1145 * (from ip_vs_core.c)
1147 const char *ip_vs_proto_name(unsigned int proto);
1148 void ip_vs_init_hash_table(struct list_head *table, int rows);
1149 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1150 struct ip_vs_dest *dest,
1151 struct sk_buff *skb,
1152 const struct ip_vs_iphdr *iph,
1155 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1157 #define IP_VS_APP_TYPE_FTP 1
1159 /* ip_vs_conn handling functions
1160 * (from ip_vs_conn.c)
1163 IP_VS_DIR_INPUT = 0,
1165 IP_VS_DIR_INPUT_ONLY,
1169 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1170 const union nf_inet_addr *caddr,
1172 const union nf_inet_addr *vaddr,
1174 struct ip_vs_conn_param *p)
1178 p->protocol = protocol;
1187 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1188 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1190 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1191 const struct sk_buff *skb,
1192 const struct ip_vs_iphdr *iph);
1194 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1196 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1197 const struct sk_buff *skb,
1198 const struct ip_vs_iphdr *iph);
1200 /* Get reference to gain full access to conn.
1201 * By default, RCU read-side critical sections have access only to
1202 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1204 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1206 return refcount_inc_not_zero(&cp->refcnt);
1209 /* put back the conn without restarting its timer */
1210 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1212 smp_mb__before_atomic();
1213 refcount_dec(&cp->refcnt);
1215 void ip_vs_conn_put(struct ip_vs_conn *cp);
1216 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1218 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1219 const union nf_inet_addr *daddr,
1220 __be16 dport, unsigned int flags,
1221 struct ip_vs_dest *dest, __u32 fwmark);
1222 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1224 const char *ip_vs_state_name(__u16 proto, int state);
1226 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1227 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1228 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1229 int ip_vs_conn_init(void);
1230 void ip_vs_conn_cleanup(void);
1232 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1234 struct ip_vs_conn *ctl_cp = cp->control;
1236 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1238 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1240 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1246 IP_VS_DBG_BUF(7, "DELeting control for: "
1247 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1248 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1250 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1251 ntohs(ctl_cp->cport));
1254 if (atomic_read(&ctl_cp->n_control) == 0) {
1255 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1257 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1259 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1264 atomic_dec(&ctl_cp->n_control);
1268 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1271 IP_VS_ERR_BUF("request control ADD for already controlled: "
1273 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1275 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1278 ip_vs_control_del(cp);
1281 IP_VS_DBG_BUF(7, "ADDing control for: "
1282 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1283 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1285 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1286 ntohs(ctl_cp->cport));
1288 cp->control = ctl_cp;
1289 atomic_inc(&ctl_cp->n_control);
1292 /* IPVS netns init & cleanup functions */
1293 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1294 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1295 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1296 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1297 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1298 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1299 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1300 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1301 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1302 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1303 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1304 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1305 void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1307 /* IPVS application functions
1308 * (from ip_vs_app.c)
1310 #define IP_VS_APP_MAX_PORTS 8
1311 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1312 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1313 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1314 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1315 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1317 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1318 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1320 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1321 struct ip_vs_iphdr *ipvsh);
1322 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1323 struct ip_vs_iphdr *ipvsh);
1325 int register_ip_vs_pe(struct ip_vs_pe *pe);
1326 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1327 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1328 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1330 /* Use a #define to avoid all of module.h just for these trivial ops */
1331 #define ip_vs_pe_get(pe) \
1332 if (pe && pe->module) \
1333 __module_get(pe->module);
1335 #define ip_vs_pe_put(pe) \
1336 if (pe && pe->module) \
1337 module_put(pe->module);
1339 /* IPVS protocol functions (from ip_vs_proto.c) */
1340 int ip_vs_protocol_init(void);
1341 void ip_vs_protocol_cleanup(void);
1342 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1343 int *ip_vs_create_timeout_table(int *table, int size);
1344 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1345 const struct sk_buff *skb, int offset,
1348 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1349 extern struct ip_vs_protocol ip_vs_protocol_udp;
1350 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1351 extern struct ip_vs_protocol ip_vs_protocol_esp;
1352 extern struct ip_vs_protocol ip_vs_protocol_ah;
1353 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1355 /* Registering/unregistering scheduler functions
1356 * (from ip_vs_sched.c)
1358 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1359 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1360 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1361 struct ip_vs_scheduler *scheduler);
1362 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1363 struct ip_vs_scheduler *sched);
1364 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1365 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1367 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1368 struct ip_vs_proto_data *pd, int *ignored,
1369 struct ip_vs_iphdr *iph);
1370 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1371 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1373 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1375 /* IPVS control data and functions (from ip_vs_ctl.c) */
1376 extern struct ip_vs_stats ip_vs_stats;
1377 extern int sysctl_ip_vs_sync_ver;
1379 struct ip_vs_service *
1380 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1381 const union nf_inet_addr *vaddr, __be16 vport);
1383 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1384 const union nf_inet_addr *daddr, __be16 dport);
1387 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1388 const union nf_inet_addr *daddr, __be16 dport);
1390 int ip_vs_use_count_inc(void);
1391 void ip_vs_use_count_dec(void);
1392 int ip_vs_register_nl_ioctl(void);
1393 void ip_vs_unregister_nl_ioctl(void);
1394 int ip_vs_control_init(void);
1395 void ip_vs_control_cleanup(void);
1397 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1398 const union nf_inet_addr *daddr, __be16 dport,
1399 const union nf_inet_addr *vaddr, __be16 vport,
1400 __u16 protocol, __u32 fwmark, __u32 flags);
1401 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1403 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1405 refcount_inc(&dest->refcnt);
1408 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1410 smp_mb__before_atomic();
1411 refcount_dec(&dest->refcnt);
1414 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1416 if (refcount_dec_and_test(&dest->refcnt))
1420 /* IPVS sync daemon data and function prototypes
1421 * (from ip_vs_sync.c)
1423 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1425 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1426 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1428 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1429 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1430 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1431 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1432 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1434 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1435 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1436 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1437 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1438 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1439 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1440 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1441 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1442 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1443 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, int offset,
1447 unsigned int hooknum, struct ip_vs_iphdr *iph);
1448 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1450 #ifdef CONFIG_IP_VS_IPV6
1451 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1452 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1453 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1454 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1455 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1456 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1457 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1458 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1459 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1460 struct ip_vs_protocol *pp, int offset,
1461 unsigned int hooknum, struct ip_vs_iphdr *iph);
1464 #ifdef CONFIG_SYSCTL
1465 /* This is a simple mechanism to ignore packets when
1466 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1467 * we start to drop 1/rate of the packets
1469 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1471 if (!ipvs->drop_rate)
1473 if (--ipvs->drop_counter > 0)
1475 ipvs->drop_counter = ipvs->drop_rate;
1479 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1482 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1483 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1485 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1489 switch (IP_VS_FWD_METHOD(cp)) {
1490 case IP_VS_CONN_F_MASQ:
1492 case IP_VS_CONN_F_LOCALNODE:
1494 case IP_VS_CONN_F_TUNNEL:
1496 case IP_VS_CONN_F_DROUTE:
1498 case IP_VS_CONN_F_BYPASS:
1506 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1507 struct ip_vs_conn *cp, int dir);
1509 #ifdef CONFIG_IP_VS_IPV6
1510 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1511 struct ip_vs_conn *cp, int dir);
1514 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1516 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1518 __be32 diff[2] = { ~old, new };
1520 return csum_partial(diff, sizeof(diff), oldsum);
1523 #ifdef CONFIG_IP_VS_IPV6
1524 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1527 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1528 new[3], new[2], new[1], new[0] };
1530 return csum_partial(diff, sizeof(diff), oldsum);
1534 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1536 __be16 diff[2] = { ~old, new };
1538 return csum_partial(diff, sizeof(diff), oldsum);
1541 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1542 static inline void ip_vs_notrack(struct sk_buff *skb)
1544 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1545 enum ip_conntrack_info ctinfo;
1546 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1549 nf_conntrack_put(&ct->ct_general);
1550 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1555 #ifdef CONFIG_IP_VS_NFCT
1556 /* Netfilter connection tracking
1557 * (from ip_vs_nfct.c)
1559 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1561 #ifdef CONFIG_SYSCTL
1562 return ipvs->sysctl_conntrack;
1568 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1570 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1571 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1572 struct ip_vs_conn *cp, u_int8_t proto,
1573 const __be16 port, int from_rs);
1574 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1578 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1583 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1584 struct ip_vs_conn *cp, int outin)
1588 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1593 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1596 #endif /* CONFIG_IP_VS_NFCT */
1598 /* Really using conntrack? */
1599 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1600 struct sk_buff *skb)
1602 #ifdef CONFIG_IP_VS_NFCT
1603 enum ip_conntrack_info ctinfo;
1606 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1608 ct = nf_ct_get(skb, &ctinfo);
1615 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1617 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1618 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1621 if (!(svc->conntrack_afmask & afmask)) {
1622 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1624 svc->conntrack_afmask |= afmask;
1632 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1634 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1635 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1637 if (svc->conntrack_afmask & afmask) {
1638 nf_ct_netns_put(svc->ipvs->net, svc->af);
1639 svc->conntrack_afmask &= ~afmask;
1645 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1647 /* We think the overhead of processing active connections is 256
1648 * times higher than that of inactive connections in average. (This
1649 * 256 times might not be accurate, we will change it later) We
1650 * use the following formula to estimate the overhead now:
1651 * dest->activeconns*256 + dest->inactconns
1653 return (atomic_read(&dest->activeconns) << 8) +
1654 atomic_read(&dest->inactconns);
1657 #endif /* _NET_IP_VS_H */