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1/*
2 * IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
8
9#include <linux/ip_vs.h> /* definitions shared with userland */
10
11#include <asm/types.h> /* for __uXX types */
12
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/compiler.h>
17#include <linux/timer.h>
18#include <linux/bug.h>
19
20#include <net/checksum.h>
21#include <linux/netfilter.h> /* for union nf_inet_addr */
22#include <linux/ip.h>
23#include <linux/ipv6.h> /* for struct ipv6hdr */
24#include <net/ipv6.h>
25#if IS_ENABLED(CONFIG_IP_VS_IPV6)
26#include <linux/netfilter_ipv6/ip6_tables.h>
27#endif
28#if IS_ENABLED(CONFIG_NF_CONNTRACK)
29#include <net/netfilter/nf_conntrack.h>
30#endif
31#include <net/net_namespace.h> /* Netw namespace */
32
33/*
34 * Generic access of ipvs struct
35 */
36static inline struct netns_ipvs *net_ipvs(struct net* net)
37{
38 return net->ipvs;
39}
40/*
41 * Get net ptr from skb in traffic cases
42 * use skb_sknet when call is from userland (ioctl or netlink)
43 */
44static inline struct net *skb_net(const struct sk_buff *skb)
45{
46#ifdef CONFIG_NET_NS
47#ifdef CONFIG_IP_VS_DEBUG
48 /*
49 * This is used for debug only.
50 * Start with the most likely hit
51 * End with BUG
52 */
53 if (likely(skb->dev && skb->dev->nd_net))
54 return dev_net(skb->dev);
55 if (skb_dst(skb) && skb_dst(skb)->dev)
56 return dev_net(skb_dst(skb)->dev);
57 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
58 __func__, __LINE__);
59 if (likely(skb->sk && skb->sk->sk_net))
60 return sock_net(skb->sk);
61 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
62 __func__, __LINE__);
63 BUG();
64#else
65 return dev_net(skb->dev ? : skb_dst(skb)->dev);
66#endif
67#else
68 return &init_net;
69#endif
70}
71
72static inline struct net *skb_sknet(const struct sk_buff *skb)
73{
74#ifdef CONFIG_NET_NS
75#ifdef CONFIG_IP_VS_DEBUG
76 /* Start with the most likely hit */
77 if (likely(skb->sk && skb->sk->sk_net))
78 return sock_net(skb->sk);
79 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
80 __func__, __LINE__);
81 if (likely(skb->dev && skb->dev->nd_net))
82 return dev_net(skb->dev);
83 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
84 __func__, __LINE__);
85 BUG();
86#else
87 return sock_net(skb->sk);
88#endif
89#else
90 return &init_net;
91#endif
92}
93/*
94 * This one needed for single_open_net since net is stored directly in
95 * private not as a struct i.e. seq_file_net can't be used.
96 */
97static inline struct net *seq_file_single_net(struct seq_file *seq)
98{
99#ifdef CONFIG_NET_NS
100 return (struct net *)seq->private;
101#else
102 return &init_net;
103#endif
104}
105
106/* Connections' size value needed by ip_vs_ctl.c */
107extern int ip_vs_conn_tab_size;
108
109struct ip_vs_iphdr {
110 __u32 len; /* IPv4 simply where L4 starts
111 IPv6 where L4 Transport Header starts */
112 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
113 __s16 protocol;
114 __s32 flags;
115 union nf_inet_addr saddr;
116 union nf_inet_addr daddr;
117};
118
119static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
120 int len, void *buffer,
121 const struct ip_vs_iphdr *ipvsh)
122{
123 return skb_header_pointer(skb, offset, len, buffer);
124}
125
126static inline void
127ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
128{
129 const struct iphdr *iph = nh;
130
131 iphdr->len = iph->ihl * 4;
132 iphdr->fragoffs = 0;
133 iphdr->protocol = iph->protocol;
134 iphdr->saddr.ip = iph->saddr;
135 iphdr->daddr.ip = iph->daddr;
136}
137
138/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
139 * IPv6 requires some extra work, as finding proper header position,
140 * depend on the IPv6 extension headers.
141 */
142static inline void
143ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
144{
145#ifdef CONFIG_IP_VS_IPV6
146 if (af == AF_INET6) {
147 const struct ipv6hdr *iph =
148 (struct ipv6hdr *)skb_network_header(skb);
149 iphdr->saddr.in6 = iph->saddr;
150 iphdr->daddr.in6 = iph->daddr;
151 /* ipv6_find_hdr() updates len, flags */
152 iphdr->len = 0;
153 iphdr->flags = 0;
154 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
155 &iphdr->fragoffs,
156 &iphdr->flags);
157 } else
158#endif
159 {
160 const struct iphdr *iph =
161 (struct iphdr *)skb_network_header(skb);
162 iphdr->len = iph->ihl * 4;
163 iphdr->fragoffs = 0;
164 iphdr->protocol = iph->protocol;
165 iphdr->saddr.ip = iph->saddr;
166 iphdr->daddr.ip = iph->daddr;
167 }
168}
169
170static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
171 const union nf_inet_addr *src)
172{
173#ifdef CONFIG_IP_VS_IPV6
174 if (af == AF_INET6)
175 dst->in6 = src->in6;
176 else
177#endif
178 dst->ip = src->ip;
179}
180
181static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
182 const union nf_inet_addr *src)
183{
184#ifdef CONFIG_IP_VS_IPV6
185 if (af == AF_INET6) {
186 dst->in6 = src->in6;
187 return;
188 }
189#endif
190 dst->ip = src->ip;
191 dst->all[1] = 0;
192 dst->all[2] = 0;
193 dst->all[3] = 0;
194}
195
196static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
197 const union nf_inet_addr *b)
198{
199#ifdef CONFIG_IP_VS_IPV6
200 if (af == AF_INET6)
201 return ipv6_addr_equal(&a->in6, &b->in6);
202#endif
203 return a->ip == b->ip;
204}
205
206#ifdef CONFIG_IP_VS_DEBUG
207#include <linux/net.h>
208
209int ip_vs_get_debug_level(void);
210
211static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
212 const union nf_inet_addr *addr,
213 int *idx)
214{
215 int len;
216#ifdef CONFIG_IP_VS_IPV6
217 if (af == AF_INET6)
218 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
219 &addr->in6) + 1;
220 else
221#endif
222 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
223 &addr->ip) + 1;
224
225 *idx += len;
226 BUG_ON(*idx > buf_len + 1);
227 return &buf[*idx - len];
228}
229
230#define IP_VS_DBG_BUF(level, msg, ...) \
231 do { \
232 char ip_vs_dbg_buf[160]; \
233 int ip_vs_dbg_idx = 0; \
234 if (level <= ip_vs_get_debug_level()) \
235 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
236 } while (0)
237#define IP_VS_ERR_BUF(msg...) \
238 do { \
239 char ip_vs_dbg_buf[160]; \
240 int ip_vs_dbg_idx = 0; \
241 pr_err(msg); \
242 } while (0)
243
244/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
245#define IP_VS_DBG_ADDR(af, addr) \
246 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
247 sizeof(ip_vs_dbg_buf), addr, \
248 &ip_vs_dbg_idx)
249
250#define IP_VS_DBG(level, msg, ...) \
251 do { \
252 if (level <= ip_vs_get_debug_level()) \
253 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
254 } while (0)
255#define IP_VS_DBG_RL(msg, ...) \
256 do { \
257 if (net_ratelimit()) \
258 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
259 } while (0)
260#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
261 do { \
262 if (level <= ip_vs_get_debug_level()) \
263 pp->debug_packet(af, pp, skb, ofs, msg); \
264 } while (0)
265#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
266 do { \
267 if (level <= ip_vs_get_debug_level() && \
268 net_ratelimit()) \
269 pp->debug_packet(af, pp, skb, ofs, msg); \
270 } while (0)
271#else /* NO DEBUGGING at ALL */
272#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
273#define IP_VS_ERR_BUF(msg...) do {} while (0)
274#define IP_VS_DBG(level, msg...) do {} while (0)
275#define IP_VS_DBG_RL(msg...) do {} while (0)
276#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
277#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
278#endif
279
280#define IP_VS_BUG() BUG()
281#define IP_VS_ERR_RL(msg, ...) \
282 do { \
283 if (net_ratelimit()) \
284 pr_err(msg, ##__VA_ARGS__); \
285 } while (0)
286
287#ifdef CONFIG_IP_VS_DEBUG
288#define EnterFunction(level) \
289 do { \
290 if (level <= ip_vs_get_debug_level()) \
291 printk(KERN_DEBUG \
292 pr_fmt("Enter: %s, %s line %i\n"), \
293 __func__, __FILE__, __LINE__); \
294 } while (0)
295#define LeaveFunction(level) \
296 do { \
297 if (level <= ip_vs_get_debug_level()) \
298 printk(KERN_DEBUG \
299 pr_fmt("Leave: %s, %s line %i\n"), \
300 __func__, __FILE__, __LINE__); \
301 } while (0)
302#else
303#define EnterFunction(level) do {} while (0)
304#define LeaveFunction(level) do {} while (0)
305#endif
306
307
308/*
309 * The port number of FTP service (in network order).
310 */
311#define FTPPORT cpu_to_be16(21)
312#define FTPDATA cpu_to_be16(20)
313
314/*
315 * TCP State Values
316 */
317enum {
318 IP_VS_TCP_S_NONE = 0,
319 IP_VS_TCP_S_ESTABLISHED,
320 IP_VS_TCP_S_SYN_SENT,
321 IP_VS_TCP_S_SYN_RECV,
322 IP_VS_TCP_S_FIN_WAIT,
323 IP_VS_TCP_S_TIME_WAIT,
324 IP_VS_TCP_S_CLOSE,
325 IP_VS_TCP_S_CLOSE_WAIT,
326 IP_VS_TCP_S_LAST_ACK,
327 IP_VS_TCP_S_LISTEN,
328 IP_VS_TCP_S_SYNACK,
329 IP_VS_TCP_S_LAST
330};
331
332/*
333 * UDP State Values
334 */
335enum {
336 IP_VS_UDP_S_NORMAL,
337 IP_VS_UDP_S_LAST,
338};
339
340/*
341 * ICMP State Values
342 */
343enum {
344 IP_VS_ICMP_S_NORMAL,
345 IP_VS_ICMP_S_LAST,
346};
347
348/*
349 * SCTP State Values
350 */
351enum ip_vs_sctp_states {
352 IP_VS_SCTP_S_NONE,
353 IP_VS_SCTP_S_INIT1,
354 IP_VS_SCTP_S_INIT,
355 IP_VS_SCTP_S_COOKIE_SENT,
356 IP_VS_SCTP_S_COOKIE_REPLIED,
357 IP_VS_SCTP_S_COOKIE_WAIT,
358 IP_VS_SCTP_S_COOKIE,
359 IP_VS_SCTP_S_COOKIE_ECHOED,
360 IP_VS_SCTP_S_ESTABLISHED,
361 IP_VS_SCTP_S_SHUTDOWN_SENT,
362 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
363 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
364 IP_VS_SCTP_S_REJECTED,
365 IP_VS_SCTP_S_CLOSED,
366 IP_VS_SCTP_S_LAST
367};
368
369/*
370 * Delta sequence info structure
371 * Each ip_vs_conn has 2 (output AND input seq. changes).
372 * Only used in the VS/NAT.
373 */
374struct ip_vs_seq {
375 __u32 init_seq; /* Add delta from this seq */
376 __u32 delta; /* Delta in sequence numbers */
377 __u32 previous_delta; /* Delta in sequence numbers
378 before last resized pkt */
379};
380
381/*
382 * counters per cpu
383 */
384struct ip_vs_counters {
385 __u32 conns; /* connections scheduled */
386 __u32 inpkts; /* incoming packets */
387 __u32 outpkts; /* outgoing packets */
388 __u64 inbytes; /* incoming bytes */
389 __u64 outbytes; /* outgoing bytes */
390};
391/*
392 * Stats per cpu
393 */
394struct ip_vs_cpu_stats {
395 struct ip_vs_counters ustats;
396 struct u64_stats_sync syncp;
397};
398
399/*
400 * IPVS statistics objects
401 */
402struct ip_vs_estimator {
403 struct list_head list;
404
405 u64 last_inbytes;
406 u64 last_outbytes;
407 u32 last_conns;
408 u32 last_inpkts;
409 u32 last_outpkts;
410
411 u32 cps;
412 u32 inpps;
413 u32 outpps;
414 u32 inbps;
415 u32 outbps;
416};
417
418struct ip_vs_stats {
419 struct ip_vs_stats_user ustats; /* statistics */
420 struct ip_vs_estimator est; /* estimator */
421 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
422 spinlock_t lock; /* spin lock */
423 struct ip_vs_stats_user ustats0; /* reset values */
424};
425
426struct dst_entry;
427struct iphdr;
428struct ip_vs_conn;
429struct ip_vs_app;
430struct sk_buff;
431struct ip_vs_proto_data;
432
433struct ip_vs_protocol {
434 struct ip_vs_protocol *next;
435 char *name;
436 u16 protocol;
437 u16 num_states;
438 int dont_defrag;
439
440 void (*init)(struct ip_vs_protocol *pp);
441
442 void (*exit)(struct ip_vs_protocol *pp);
443
444 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
445
446 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
447
448 int (*conn_schedule)(int af, struct sk_buff *skb,
449 struct ip_vs_proto_data *pd,
450 int *verdict, struct ip_vs_conn **cpp,
451 struct ip_vs_iphdr *iph);
452
453 struct ip_vs_conn *
454 (*conn_in_get)(int af,
455 const struct sk_buff *skb,
456 const struct ip_vs_iphdr *iph,
457 int inverse);
458
459 struct ip_vs_conn *
460 (*conn_out_get)(int af,
461 const struct sk_buff *skb,
462 const struct ip_vs_iphdr *iph,
463 int inverse);
464
465 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
466 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
467
468 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
469 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
470
471 int (*csum_check)(int af, struct sk_buff *skb,
472 struct ip_vs_protocol *pp);
473
474 const char *(*state_name)(int state);
475
476 void (*state_transition)(struct ip_vs_conn *cp, int direction,
477 const struct sk_buff *skb,
478 struct ip_vs_proto_data *pd);
479
480 int (*register_app)(struct net *net, struct ip_vs_app *inc);
481
482 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
483
484 int (*app_conn_bind)(struct ip_vs_conn *cp);
485
486 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
487 const struct sk_buff *skb,
488 int offset,
489 const char *msg);
490
491 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
492};
493
494/*
495 * protocol data per netns
496 */
497struct ip_vs_proto_data {
498 struct ip_vs_proto_data *next;
499 struct ip_vs_protocol *pp;
500 int *timeout_table; /* protocol timeout table */
501 atomic_t appcnt; /* counter of proto app incs. */
502 struct tcp_states_t *tcp_state_table;
503};
504
505struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
506struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
507 unsigned short proto);
508
509struct ip_vs_conn_param {
510 struct net *net;
511 const union nf_inet_addr *caddr;
512 const union nf_inet_addr *vaddr;
513 __be16 cport;
514 __be16 vport;
515 __u16 protocol;
516 u16 af;
517
518 const struct ip_vs_pe *pe;
519 char *pe_data;
520 __u8 pe_data_len;
521};
522
523/*
524 * IP_VS structure allocated for each dynamically scheduled connection
525 */
526struct ip_vs_conn {
527 struct hlist_node c_list; /* hashed list heads */
528 /* Protocol, addresses and port numbers */
529 __be16 cport;
530 __be16 dport;
531 __be16 vport;
532 u16 af; /* address family */
533 union nf_inet_addr caddr; /* client address */
534 union nf_inet_addr vaddr; /* virtual address */
535 union nf_inet_addr daddr; /* destination address */
536 volatile __u32 flags; /* status flags */
537 __u16 protocol; /* Which protocol (TCP/UDP) */
538#ifdef CONFIG_NET_NS
539 struct net *net; /* Name space */
540#endif
541
542 /* counter and timer */
543 atomic_t refcnt; /* reference count */
544 struct timer_list timer; /* Expiration timer */
545 volatile unsigned long timeout; /* timeout */
546
547 /* Flags and state transition */
548 spinlock_t lock; /* lock for state transition */
549 volatile __u16 state; /* state info */
550 volatile __u16 old_state; /* old state, to be used for
551 * state transition triggerd
552 * synchronization
553 */
554 __u32 fwmark; /* Fire wall mark from skb */
555 unsigned long sync_endtime; /* jiffies + sent_retries */
556
557 /* Control members */
558 struct ip_vs_conn *control; /* Master control connection */
559 atomic_t n_control; /* Number of controlled ones */
560 struct ip_vs_dest *dest; /* real server */
561 atomic_t in_pkts; /* incoming packet counter */
562
563 /* packet transmitter for different forwarding methods. If it
564 mangles the packet, it must return NF_DROP or better NF_STOLEN,
565 otherwise this must be changed to a sk_buff **.
566 NF_ACCEPT can be returned when destination is local.
567 */
568 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
569 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
570
571 /* Note: we can group the following members into a structure,
572 in order to save more space, and the following members are
573 only used in VS/NAT anyway */
574 struct ip_vs_app *app; /* bound ip_vs_app object */
575 void *app_data; /* Application private data */
576 struct ip_vs_seq in_seq; /* incoming seq. struct */
577 struct ip_vs_seq out_seq; /* outgoing seq. struct */
578
579 const struct ip_vs_pe *pe;
580 char *pe_data;
581 __u8 pe_data_len;
582
583 struct rcu_head rcu_head;
584};
585
586/*
587 * To save some memory in conn table when name space is disabled.
588 */
589static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
590{
591#ifdef CONFIG_NET_NS
592 return cp->net;
593#else
594 return &init_net;
595#endif
596}
597static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
598{
599#ifdef CONFIG_NET_NS
600 cp->net = net;
601#endif
602}
603
604static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
605 struct net *net)
606{
607#ifdef CONFIG_NET_NS
608 return cp->net == net;
609#else
610 return 1;
611#endif
612}
613
614/*
615 * Extended internal versions of struct ip_vs_service_user and
616 * ip_vs_dest_user for IPv6 support.
617 *
618 * We need these to conveniently pass around service and destination
619 * options, but unfortunately, we also need to keep the old definitions to
620 * maintain userspace backwards compatibility for the setsockopt interface.
621 */
622struct ip_vs_service_user_kern {
623 /* virtual service addresses */
624 u16 af;
625 u16 protocol;
626 union nf_inet_addr addr; /* virtual ip address */
627 __be16 port;
628 u32 fwmark; /* firwall mark of service */
629
630 /* virtual service options */
631 char *sched_name;
632 char *pe_name;
633 unsigned int flags; /* virtual service flags */
634 unsigned int timeout; /* persistent timeout in sec */
635 __be32 netmask; /* persistent netmask or plen */
636};
637
638
639struct ip_vs_dest_user_kern {
640 /* destination server address */
641 union nf_inet_addr addr;
642 __be16 port;
643
644 /* real server options */
645 unsigned int conn_flags; /* connection flags */
646 int weight; /* destination weight */
647
648 /* thresholds for active connections */
649 u32 u_threshold; /* upper threshold */
650 u32 l_threshold; /* lower threshold */
651};
652
653
654/*
655 * The information about the virtual service offered to the net
656 * and the forwarding entries
657 */
658struct ip_vs_service {
659 struct hlist_node s_list; /* for normal service table */
660 struct hlist_node f_list; /* for fwmark-based service table */
661 atomic_t refcnt; /* reference counter */
662
663 u16 af; /* address family */
664 __u16 protocol; /* which protocol (TCP/UDP) */
665 union nf_inet_addr addr; /* IP address for virtual service */
666 __be16 port; /* port number for the service */
667 __u32 fwmark; /* firewall mark of the service */
668 unsigned int flags; /* service status flags */
669 unsigned int timeout; /* persistent timeout in ticks */
670 __be32 netmask; /* grouping granularity, mask/plen */
671 struct net *net;
672
673 struct list_head destinations; /* real server d-linked list */
674 __u32 num_dests; /* number of servers */
675 struct ip_vs_stats stats; /* statistics for the service */
676
677 /* for scheduling */
678 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
679 spinlock_t sched_lock; /* lock sched_data */
680 void *sched_data; /* scheduler application data */
681
682 /* alternate persistence engine */
683 struct ip_vs_pe __rcu *pe;
684
685 struct rcu_head rcu_head;
686};
687
688/* Information for cached dst */
689struct ip_vs_dest_dst {
690 struct dst_entry *dst_cache; /* destination cache entry */
691 u32 dst_cookie;
692 union nf_inet_addr dst_saddr;
693 struct rcu_head rcu_head;
694};
695
696/*
697 * The real server destination forwarding entry
698 * with ip address, port number, and so on.
699 */
700struct ip_vs_dest {
701 struct list_head n_list; /* for the dests in the service */
702 struct hlist_node d_list; /* for table with all the dests */
703
704 u16 af; /* address family */
705 __be16 port; /* port number of the server */
706 union nf_inet_addr addr; /* IP address of the server */
707 volatile unsigned int flags; /* dest status flags */
708 atomic_t conn_flags; /* flags to copy to conn */
709 atomic_t weight; /* server weight */
710
711 atomic_t refcnt; /* reference counter */
712 struct ip_vs_stats stats; /* statistics */
713 unsigned long idle_start; /* start time, jiffies */
714
715 /* connection counters and thresholds */
716 atomic_t activeconns; /* active connections */
717 atomic_t inactconns; /* inactive connections */
718 atomic_t persistconns; /* persistent connections */
719 __u32 u_threshold; /* upper threshold */
720 __u32 l_threshold; /* lower threshold */
721
722 /* for destination cache */
723 spinlock_t dst_lock; /* lock of dst_cache */
724 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
725
726 /* for virtual service */
727 struct ip_vs_service __rcu *svc; /* service it belongs to */
728 __u16 protocol; /* which protocol (TCP/UDP) */
729 __be16 vport; /* virtual port number */
730 union nf_inet_addr vaddr; /* virtual IP address */
731 __u32 vfwmark; /* firewall mark of service */
732
733 struct list_head t_list; /* in dest_trash */
734 unsigned int in_rs_table:1; /* we are in rs_table */
735};
736
737
738/*
739 * The scheduler object
740 */
741struct ip_vs_scheduler {
742 struct list_head n_list; /* d-linked list head */
743 char *name; /* scheduler name */
744 atomic_t refcnt; /* reference counter */
745 struct module *module; /* THIS_MODULE/NULL */
746
747 /* scheduler initializing service */
748 int (*init_service)(struct ip_vs_service *svc);
749 /* scheduling service finish */
750 void (*done_service)(struct ip_vs_service *svc);
751 /* dest is linked */
752 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
753 /* dest is unlinked */
754 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
755 /* dest is updated */
756 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
757
758 /* selecting a server from the given service */
759 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
760 const struct sk_buff *skb,
761 struct ip_vs_iphdr *iph);
762};
763
764/* The persistence engine object */
765struct ip_vs_pe {
766 struct list_head n_list; /* d-linked list head */
767 char *name; /* scheduler name */
768 atomic_t refcnt; /* reference counter */
769 struct module *module; /* THIS_MODULE/NULL */
770
771 /* get the connection template, if any */
772 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
773 bool (*ct_match)(const struct ip_vs_conn_param *p,
774 struct ip_vs_conn *ct);
775 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
776 bool inverse);
777 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
778};
779
780/*
781 * The application module object (a.k.a. app incarnation)
782 */
783struct ip_vs_app {
784 struct list_head a_list; /* member in app list */
785 int type; /* IP_VS_APP_TYPE_xxx */
786 char *name; /* application module name */
787 __u16 protocol;
788 struct module *module; /* THIS_MODULE/NULL */
789 struct list_head incs_list; /* list of incarnations */
790
791 /* members for application incarnations */
792 struct list_head p_list; /* member in proto app list */
793 struct ip_vs_app *app; /* its real application */
794 __be16 port; /* port number in net order */
795 atomic_t usecnt; /* usage counter */
796 struct rcu_head rcu_head;
797
798 /*
799 * output hook: Process packet in inout direction, diff set for TCP.
800 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
801 * 2=Mangled but checksum was not updated
802 */
803 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
804 struct sk_buff *, int *diff);
805
806 /*
807 * input hook: Process packet in outin direction, diff set for TCP.
808 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
809 * 2=Mangled but checksum was not updated
810 */
811 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
812 struct sk_buff *, int *diff);
813
814 /* ip_vs_app initializer */
815 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
816
817 /* ip_vs_app finish */
818 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
819
820
821 /* not used now */
822 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
823 struct ip_vs_protocol *);
824
825 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
826
827 int * timeout_table;
828 int * timeouts;
829 int timeouts_size;
830
831 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
832 int *verdict, struct ip_vs_conn **cpp);
833
834 struct ip_vs_conn *
835 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
836 const struct iphdr *iph, int inverse);
837
838 struct ip_vs_conn *
839 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
840 const struct iphdr *iph, int inverse);
841
842 int (*state_transition)(struct ip_vs_conn *cp, int direction,
843 const struct sk_buff *skb,
844 struct ip_vs_app *app);
845
846 void (*timeout_change)(struct ip_vs_app *app, int flags);
847};
848
849struct ipvs_master_sync_state {
850 struct list_head sync_queue;
851 struct ip_vs_sync_buff *sync_buff;
852 unsigned long sync_queue_len;
853 unsigned int sync_queue_delay;
854 struct task_struct *master_thread;
855 struct delayed_work master_wakeup_work;
856 struct netns_ipvs *ipvs;
857};
858
859/* How much time to keep dests in trash */
860#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
861
862/* IPVS in network namespace */
863struct netns_ipvs {
864 int gen; /* Generation */
865 int enable; /* enable like nf_hooks do */
866 /*
867 * Hash table: for real service lookups
868 */
869 #define IP_VS_RTAB_BITS 4
870 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
871 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
872
873 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
874 /* ip_vs_app */
875 struct list_head app_list;
876 /* ip_vs_proto */
877 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
878 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
879 /* ip_vs_proto_tcp */
880#ifdef CONFIG_IP_VS_PROTO_TCP
881 #define TCP_APP_TAB_BITS 4
882 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
883 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
884 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
885#endif
886 /* ip_vs_proto_udp */
887#ifdef CONFIG_IP_VS_PROTO_UDP
888 #define UDP_APP_TAB_BITS 4
889 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
890 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
891 struct list_head udp_apps[UDP_APP_TAB_SIZE];
892#endif
893 /* ip_vs_proto_sctp */
894#ifdef CONFIG_IP_VS_PROTO_SCTP
895 #define SCTP_APP_TAB_BITS 4
896 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
897 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
898 /* Hash table for SCTP application incarnations */
899 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
900#endif
901 /* ip_vs_conn */
902 atomic_t conn_count; /* connection counter */
903
904 /* ip_vs_ctl */
905 struct ip_vs_stats tot_stats; /* Statistics & est. */
906
907 int num_services; /* no of virtual services */
908
909 /* Trash for destinations */
910 struct list_head dest_trash;
911 spinlock_t dest_trash_lock;
912 struct timer_list dest_trash_timer; /* expiration timer */
913 /* Service counters */
914 atomic_t ftpsvc_counter;
915 atomic_t nullsvc_counter;
916
917#ifdef CONFIG_SYSCTL
918 /* 1/rate drop and drop-entry variables */
919 struct delayed_work defense_work; /* Work handler */
920 int drop_rate;
921 int drop_counter;
922 atomic_t dropentry;
923 /* locks in ctl.c */
924 spinlock_t dropentry_lock; /* drop entry handling */
925 spinlock_t droppacket_lock; /* drop packet handling */
926 spinlock_t securetcp_lock; /* state and timeout tables */
927
928 /* sys-ctl struct */
929 struct ctl_table_header *sysctl_hdr;
930 struct ctl_table *sysctl_tbl;
931#endif
932
933 /* sysctl variables */
934 int sysctl_amemthresh;
935 int sysctl_am_droprate;
936 int sysctl_drop_entry;
937 int sysctl_drop_packet;
938 int sysctl_secure_tcp;
939#ifdef CONFIG_IP_VS_NFCT
940 int sysctl_conntrack;
941#endif
942 int sysctl_snat_reroute;
943 int sysctl_sync_ver;
944 int sysctl_sync_ports;
945 int sysctl_sync_persist_mode;
946 unsigned long sysctl_sync_qlen_max;
947 int sysctl_sync_sock_size;
948 int sysctl_cache_bypass;
949 int sysctl_expire_nodest_conn;
950 int sysctl_sloppy_tcp;
951 int sysctl_sloppy_sctp;
952 int sysctl_expire_quiescent_template;
953 int sysctl_sync_threshold[2];
954 unsigned int sysctl_sync_refresh_period;
955 int sysctl_sync_retries;
956 int sysctl_nat_icmp_send;
957 int sysctl_pmtu_disc;
958 int sysctl_backup_only;
959
960 /* ip_vs_lblc */
961 int sysctl_lblc_expiration;
962 struct ctl_table_header *lblc_ctl_header;
963 struct ctl_table *lblc_ctl_table;
964 /* ip_vs_lblcr */
965 int sysctl_lblcr_expiration;
966 struct ctl_table_header *lblcr_ctl_header;
967 struct ctl_table *lblcr_ctl_table;
968 /* ip_vs_est */
969 struct list_head est_list; /* estimator list */
970 spinlock_t est_lock;
971 struct timer_list est_timer; /* Estimation timer */
972 /* ip_vs_sync */
973 spinlock_t sync_lock;
974 struct ipvs_master_sync_state *ms;
975 spinlock_t sync_buff_lock;
976 struct task_struct **backup_threads;
977 int threads_mask;
978 int send_mesg_maxlen;
979 int recv_mesg_maxlen;
980 volatile int sync_state;
981 volatile int master_syncid;
982 volatile int backup_syncid;
983 struct mutex sync_mutex;
984 /* multicast interface name */
985 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
986 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
987 /* net name space ptr */
988 struct net *net; /* Needed by timer routines */
989};
990
991#define DEFAULT_SYNC_THRESHOLD 3
992#define DEFAULT_SYNC_PERIOD 50
993#define DEFAULT_SYNC_VER 1
994#define DEFAULT_SLOPPY_TCP 0
995#define DEFAULT_SLOPPY_SCTP 0
996#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
997#define DEFAULT_SYNC_RETRIES 0
998#define IPVS_SYNC_WAKEUP_RATE 8
999#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1000#define IPVS_SYNC_SEND_DELAY (HZ / 50)
1001#define IPVS_SYNC_CHECK_PERIOD HZ
1002#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1003#define IPVS_SYNC_PORTS_MAX (1 << 6)
1004
1005#ifdef CONFIG_SYSCTL
1006
1007static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1008{
1009 return ipvs->sysctl_sync_threshold[0];
1010}
1011
1012static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1013{
1014 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1015}
1016
1017static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1018{
1019 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1020}
1021
1022static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1023{
1024 return ipvs->sysctl_sync_retries;
1025}
1026
1027static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1028{
1029 return ipvs->sysctl_sync_ver;
1030}
1031
1032static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1033{
1034 return ipvs->sysctl_sloppy_tcp;
1035}
1036
1037static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1038{
1039 return ipvs->sysctl_sloppy_sctp;
1040}
1041
1042static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1043{
1044 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1045}
1046
1047static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1048{
1049 return ipvs->sysctl_sync_persist_mode;
1050}
1051
1052static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1053{
1054 return ipvs->sysctl_sync_qlen_max;
1055}
1056
1057static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1058{
1059 return ipvs->sysctl_sync_sock_size;
1060}
1061
1062static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1063{
1064 return ipvs->sysctl_pmtu_disc;
1065}
1066
1067static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1068{
1069 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1070 ipvs->sysctl_backup_only;
1071}
1072
1073#else
1074
1075static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1076{
1077 return DEFAULT_SYNC_THRESHOLD;
1078}
1079
1080static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1081{
1082 return DEFAULT_SYNC_PERIOD;
1083}
1084
1085static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1086{
1087 return DEFAULT_SYNC_REFRESH_PERIOD;
1088}
1089
1090static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1091{
1092 return DEFAULT_SYNC_RETRIES & 3;
1093}
1094
1095static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1096{
1097 return DEFAULT_SYNC_VER;
1098}
1099
1100static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1101{
1102 return DEFAULT_SLOPPY_TCP;
1103}
1104
1105static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1106{
1107 return DEFAULT_SLOPPY_SCTP;
1108}
1109
1110static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1111{
1112 return 1;
1113}
1114
1115static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1116{
1117 return 0;
1118}
1119
1120static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1121{
1122 return IPVS_SYNC_QLEN_MAX;
1123}
1124
1125static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1126{
1127 return 0;
1128}
1129
1130static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1131{
1132 return 1;
1133}
1134
1135static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1136{
1137 return 0;
1138}
1139
1140#endif
1141
1142/*
1143 * IPVS core functions
1144 * (from ip_vs_core.c)
1145 */
1146const char *ip_vs_proto_name(unsigned int proto);
1147void ip_vs_init_hash_table(struct list_head *table, int rows);
1148#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1149
1150#define IP_VS_APP_TYPE_FTP 1
1151
1152/*
1153 * ip_vs_conn handling functions
1154 * (from ip_vs_conn.c)
1155 */
1156
1157enum {
1158 IP_VS_DIR_INPUT = 0,
1159 IP_VS_DIR_OUTPUT,
1160 IP_VS_DIR_INPUT_ONLY,
1161 IP_VS_DIR_LAST,
1162};
1163
1164static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1165 const union nf_inet_addr *caddr,
1166 __be16 cport,
1167 const union nf_inet_addr *vaddr,
1168 __be16 vport,
1169 struct ip_vs_conn_param *p)
1170{
1171 p->net = net;
1172 p->af = af;
1173 p->protocol = protocol;
1174 p->caddr = caddr;
1175 p->cport = cport;
1176 p->vaddr = vaddr;
1177 p->vport = vport;
1178 p->pe = NULL;
1179 p->pe_data = NULL;
1180}
1181
1182struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1183struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1184
1185struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1186 const struct ip_vs_iphdr *iph,
1187 int inverse);
1188
1189struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1190
1191struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1192 const struct ip_vs_iphdr *iph,
1193 int inverse);
1194
1195/* Get reference to gain full access to conn.
1196 * By default, RCU read-side critical sections have access only to
1197 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1198 */
1199static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1200{
1201 return atomic_inc_not_zero(&cp->refcnt);
1202}
1203
1204/* put back the conn without restarting its timer */
1205static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1206{
1207 smp_mb__before_atomic_dec();
1208 atomic_dec(&cp->refcnt);
1209}
1210void ip_vs_conn_put(struct ip_vs_conn *cp);
1211void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1212
1213struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1214 const union nf_inet_addr *daddr,
1215 __be16 dport, unsigned int flags,
1216 struct ip_vs_dest *dest, __u32 fwmark);
1217void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1218
1219const char *ip_vs_state_name(__u16 proto, int state);
1220
1221void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1222int ip_vs_check_template(struct ip_vs_conn *ct);
1223void ip_vs_random_dropentry(struct net *net);
1224int ip_vs_conn_init(void);
1225void ip_vs_conn_cleanup(void);
1226
1227static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1228{
1229 struct ip_vs_conn *ctl_cp = cp->control;
1230 if (!ctl_cp) {
1231 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1232 "%s:%d to %s:%d\n",
1233 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1234 ntohs(cp->cport),
1235 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1236 ntohs(cp->vport));
1237
1238 return;
1239 }
1240
1241 IP_VS_DBG_BUF(7, "DELeting control for: "
1242 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1243 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1244 ntohs(cp->cport),
1245 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1246 ntohs(ctl_cp->cport));
1247
1248 cp->control = NULL;
1249 if (atomic_read(&ctl_cp->n_control) == 0) {
1250 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1251 "%s:%d to %s:%d\n",
1252 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1253 ntohs(cp->cport),
1254 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1255 ntohs(cp->vport));
1256
1257 return;
1258 }
1259 atomic_dec(&ctl_cp->n_control);
1260}
1261
1262static inline void
1263ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1264{
1265 if (cp->control) {
1266 IP_VS_ERR_BUF("request control ADD for already controlled: "
1267 "%s:%d to %s:%d\n",
1268 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1269 ntohs(cp->cport),
1270 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1271 ntohs(cp->vport));
1272
1273 ip_vs_control_del(cp);
1274 }
1275
1276 IP_VS_DBG_BUF(7, "ADDing control for: "
1277 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1278 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1279 ntohs(cp->cport),
1280 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1281 ntohs(ctl_cp->cport));
1282
1283 cp->control = ctl_cp;
1284 atomic_inc(&ctl_cp->n_control);
1285}
1286
1287/*
1288 * IPVS netns init & cleanup functions
1289 */
1290int ip_vs_estimator_net_init(struct net *net);
1291int ip_vs_control_net_init(struct net *net);
1292int ip_vs_protocol_net_init(struct net *net);
1293int ip_vs_app_net_init(struct net *net);
1294int ip_vs_conn_net_init(struct net *net);
1295int ip_vs_sync_net_init(struct net *net);
1296void ip_vs_conn_net_cleanup(struct net *net);
1297void ip_vs_app_net_cleanup(struct net *net);
1298void ip_vs_protocol_net_cleanup(struct net *net);
1299void ip_vs_control_net_cleanup(struct net *net);
1300void ip_vs_estimator_net_cleanup(struct net *net);
1301void ip_vs_sync_net_cleanup(struct net *net);
1302void ip_vs_service_net_cleanup(struct net *net);
1303
1304/*
1305 * IPVS application functions
1306 * (from ip_vs_app.c)
1307 */
1308#define IP_VS_APP_MAX_PORTS 8
1309struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1310void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1311int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1312void ip_vs_unbind_app(struct ip_vs_conn *cp);
1313int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
1314 __u16 port);
1315int ip_vs_app_inc_get(struct ip_vs_app *inc);
1316void ip_vs_app_inc_put(struct ip_vs_app *inc);
1317
1318int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1319int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1320
1321int register_ip_vs_pe(struct ip_vs_pe *pe);
1322int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1323struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1324struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1325
1326/*
1327 * Use a #define to avoid all of module.h just for these trivial ops
1328 */
1329#define ip_vs_pe_get(pe) \
1330 if (pe && pe->module) \
1331 __module_get(pe->module);
1332
1333#define ip_vs_pe_put(pe) \
1334 if (pe && pe->module) \
1335 module_put(pe->module);
1336
1337/*
1338 * IPVS protocol functions (from ip_vs_proto.c)
1339 */
1340int ip_vs_protocol_init(void);
1341void ip_vs_protocol_cleanup(void);
1342void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1343int *ip_vs_create_timeout_table(int *table, int size);
1344int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1345 const char *name, int to);
1346void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1347 const struct sk_buff *skb, int offset,
1348 const char *msg);
1349
1350extern struct ip_vs_protocol ip_vs_protocol_tcp;
1351extern struct ip_vs_protocol ip_vs_protocol_udp;
1352extern struct ip_vs_protocol ip_vs_protocol_icmp;
1353extern struct ip_vs_protocol ip_vs_protocol_esp;
1354extern struct ip_vs_protocol ip_vs_protocol_ah;
1355extern struct ip_vs_protocol ip_vs_protocol_sctp;
1356
1357/*
1358 * Registering/unregistering scheduler functions
1359 * (from ip_vs_sched.c)
1360 */
1361int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1362int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1363int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1364 struct ip_vs_scheduler *scheduler);
1365void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1366 struct ip_vs_scheduler *sched);
1367struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1368void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1369struct ip_vs_conn *
1370ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1371 struct ip_vs_proto_data *pd, int *ignored,
1372 struct ip_vs_iphdr *iph);
1373int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1374 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1375
1376void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1377
1378
1379/*
1380 * IPVS control data and functions (from ip_vs_ctl.c)
1381 */
1382extern struct ip_vs_stats ip_vs_stats;
1383extern int sysctl_ip_vs_sync_ver;
1384
1385struct ip_vs_service *
1386ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1387 const union nf_inet_addr *vaddr, __be16 vport);
1388
1389bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1390 const union nf_inet_addr *daddr, __be16 dport);
1391
1392int ip_vs_use_count_inc(void);
1393void ip_vs_use_count_dec(void);
1394int ip_vs_register_nl_ioctl(void);
1395void ip_vs_unregister_nl_ioctl(void);
1396int ip_vs_control_init(void);
1397void ip_vs_control_cleanup(void);
1398struct ip_vs_dest *
1399ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1400 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1401 __u16 protocol, __u32 fwmark, __u32 flags);
1402void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1403
1404static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1405{
1406 atomic_inc(&dest->refcnt);
1407}
1408
1409static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1410{
1411 smp_mb__before_atomic_dec();
1412 atomic_dec(&dest->refcnt);
1413}
1414
1415static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1416{
1417 if (atomic_dec_return(&dest->refcnt) < 0)
1418 kfree(dest);
1419}
1420
1421/*
1422 * IPVS sync daemon data and function prototypes
1423 * (from ip_vs_sync.c)
1424 */
1425int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
1426int stop_sync_thread(struct net *net, int state);
1427void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1428
1429/*
1430 * IPVS rate estimator prototypes (from ip_vs_est.c)
1431 */
1432void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1433void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1434void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1435void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1436 struct ip_vs_stats *stats);
1437
1438/*
1439 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1440 */
1441int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1442 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1443int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1447int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1448 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1449int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1450 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1451int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1452 struct ip_vs_protocol *pp, int offset,
1453 unsigned int hooknum, struct ip_vs_iphdr *iph);
1454void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1455
1456#ifdef CONFIG_IP_VS_IPV6
1457int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1458 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1459int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1460 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1461int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1462 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1464 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1466 struct ip_vs_protocol *pp, int offset,
1467 unsigned int hooknum, struct ip_vs_iphdr *iph);
1468#endif
1469
1470#ifdef CONFIG_SYSCTL
1471/*
1472 * This is a simple mechanism to ignore packets when
1473 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1474 * we start to drop 1/rate of the packets
1475 */
1476
1477static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1478{
1479 if (!ipvs->drop_rate)
1480 return 0;
1481 if (--ipvs->drop_counter > 0)
1482 return 0;
1483 ipvs->drop_counter = ipvs->drop_rate;
1484 return 1;
1485}
1486#else
1487static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1488#endif
1489
1490/*
1491 * ip_vs_fwd_tag returns the forwarding tag of the connection
1492 */
1493#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1494
1495static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1496{
1497 char fwd;
1498
1499 switch (IP_VS_FWD_METHOD(cp)) {
1500 case IP_VS_CONN_F_MASQ:
1501 fwd = 'M'; break;
1502 case IP_VS_CONN_F_LOCALNODE:
1503 fwd = 'L'; break;
1504 case IP_VS_CONN_F_TUNNEL:
1505 fwd = 'T'; break;
1506 case IP_VS_CONN_F_DROUTE:
1507 fwd = 'R'; break;
1508 case IP_VS_CONN_F_BYPASS:
1509 fwd = 'B'; break;
1510 default:
1511 fwd = '?'; break;
1512 }
1513 return fwd;
1514}
1515
1516void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1517 struct ip_vs_conn *cp, int dir);
1518
1519#ifdef CONFIG_IP_VS_IPV6
1520void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1521 struct ip_vs_conn *cp, int dir);
1522#endif
1523
1524__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1525
1526static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1527{
1528 __be32 diff[2] = { ~old, new };
1529
1530 return csum_partial(diff, sizeof(diff), oldsum);
1531}
1532
1533#ifdef CONFIG_IP_VS_IPV6
1534static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1535 __wsum oldsum)
1536{
1537 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1538 new[3], new[2], new[1], new[0] };
1539
1540 return csum_partial(diff, sizeof(diff), oldsum);
1541}
1542#endif
1543
1544static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1545{
1546 __be16 diff[2] = { ~old, new };
1547
1548 return csum_partial(diff, sizeof(diff), oldsum);
1549}
1550
1551/*
1552 * Forget current conntrack (unconfirmed) and attach notrack entry
1553 */
1554static inline void ip_vs_notrack(struct sk_buff *skb)
1555{
1556#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1557 enum ip_conntrack_info ctinfo;
1558 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1559
1560 if (!ct || !nf_ct_is_untracked(ct)) {
1561 nf_conntrack_put(skb->nfct);
1562 skb->nfct = &nf_ct_untracked_get()->ct_general;
1563 skb->nfctinfo = IP_CT_NEW;
1564 nf_conntrack_get(skb->nfct);
1565 }
1566#endif
1567}
1568
1569#ifdef CONFIG_IP_VS_NFCT
1570/*
1571 * Netfilter connection tracking
1572 * (from ip_vs_nfct.c)
1573 */
1574static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1575{
1576#ifdef CONFIG_SYSCTL
1577 return ipvs->sysctl_conntrack;
1578#else
1579 return 0;
1580#endif
1581}
1582
1583void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1584 int outin);
1585int ip_vs_confirm_conntrack(struct sk_buff *skb);
1586void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1587 struct ip_vs_conn *cp, u_int8_t proto,
1588 const __be16 port, int from_rs);
1589void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1590
1591#else
1592
1593static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1594{
1595 return 0;
1596}
1597
1598static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1599 struct ip_vs_conn *cp, int outin)
1600{
1601}
1602
1603static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1604{
1605 return NF_ACCEPT;
1606}
1607
1608static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1609{
1610}
1611/* CONFIG_IP_VS_NFCT */
1612#endif
1613
1614static inline int
1615ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1616{
1617 /*
1618 * We think the overhead of processing active connections is 256
1619 * times higher than that of inactive connections in average. (This
1620 * 256 times might not be accurate, we will change it later) We
1621 * use the following formula to estimate the overhead now:
1622 * dest->activeconns*256 + dest->inactconns
1623 */
1624 return (atomic_read(&dest->activeconns) << 8) +
1625 atomic_read(&dest->inactconns);
1626}
1627
1628#endif /* _NET_IP_VS_H */
1/*
2 * IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
8
9#include <linux/ip_vs.h> /* definitions shared with userland */
10
11#include <asm/types.h> /* for __uXX types */
12
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/compiler.h>
17#include <linux/timer.h>
18#include <linux/bug.h>
19
20#include <net/checksum.h>
21#include <linux/netfilter.h> /* for union nf_inet_addr */
22#include <linux/ip.h>
23#include <linux/ipv6.h> /* for struct ipv6hdr */
24#include <net/ipv6.h>
25#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
26#include <net/netfilter/nf_conntrack.h>
27#endif
28#include <net/net_namespace.h> /* Netw namespace */
29
30/*
31 * Generic access of ipvs struct
32 */
33static inline struct netns_ipvs *net_ipvs(struct net* net)
34{
35 return net->ipvs;
36}
37/*
38 * Get net ptr from skb in traffic cases
39 * use skb_sknet when call is from userland (ioctl or netlink)
40 */
41static inline struct net *skb_net(const struct sk_buff *skb)
42{
43#ifdef CONFIG_NET_NS
44#ifdef CONFIG_IP_VS_DEBUG
45 /*
46 * This is used for debug only.
47 * Start with the most likely hit
48 * End with BUG
49 */
50 if (likely(skb->dev && skb->dev->nd_net))
51 return dev_net(skb->dev);
52 if (skb_dst(skb) && skb_dst(skb)->dev)
53 return dev_net(skb_dst(skb)->dev);
54 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
55 __func__, __LINE__);
56 if (likely(skb->sk && skb->sk->sk_net))
57 return sock_net(skb->sk);
58 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
59 __func__, __LINE__);
60 BUG();
61#else
62 return dev_net(skb->dev ? : skb_dst(skb)->dev);
63#endif
64#else
65 return &init_net;
66#endif
67}
68
69static inline struct net *skb_sknet(const struct sk_buff *skb)
70{
71#ifdef CONFIG_NET_NS
72#ifdef CONFIG_IP_VS_DEBUG
73 /* Start with the most likely hit */
74 if (likely(skb->sk && skb->sk->sk_net))
75 return sock_net(skb->sk);
76 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
77 __func__, __LINE__);
78 if (likely(skb->dev && skb->dev->nd_net))
79 return dev_net(skb->dev);
80 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
81 __func__, __LINE__);
82 BUG();
83#else
84 return sock_net(skb->sk);
85#endif
86#else
87 return &init_net;
88#endif
89}
90/*
91 * This one needed for single_open_net since net is stored directly in
92 * private not as a struct i.e. seq_file_net can't be used.
93 */
94static inline struct net *seq_file_single_net(struct seq_file *seq)
95{
96#ifdef CONFIG_NET_NS
97 return (struct net *)seq->private;
98#else
99 return &init_net;
100#endif
101}
102
103/* Connections' size value needed by ip_vs_ctl.c */
104extern int ip_vs_conn_tab_size;
105
106
107struct ip_vs_iphdr {
108 int len;
109 __u8 protocol;
110 union nf_inet_addr saddr;
111 union nf_inet_addr daddr;
112};
113
114static inline void
115ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
116{
117#ifdef CONFIG_IP_VS_IPV6
118 if (af == AF_INET6) {
119 const struct ipv6hdr *iph = nh;
120 iphdr->len = sizeof(struct ipv6hdr);
121 iphdr->protocol = iph->nexthdr;
122 iphdr->saddr.in6 = iph->saddr;
123 iphdr->daddr.in6 = iph->daddr;
124 } else
125#endif
126 {
127 const struct iphdr *iph = nh;
128 iphdr->len = iph->ihl * 4;
129 iphdr->protocol = iph->protocol;
130 iphdr->saddr.ip = iph->saddr;
131 iphdr->daddr.ip = iph->daddr;
132 }
133}
134
135static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
136 const union nf_inet_addr *src)
137{
138#ifdef CONFIG_IP_VS_IPV6
139 if (af == AF_INET6)
140 dst->in6 = src->in6;
141 else
142#endif
143 dst->ip = src->ip;
144}
145
146static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
147 const union nf_inet_addr *b)
148{
149#ifdef CONFIG_IP_VS_IPV6
150 if (af == AF_INET6)
151 return ipv6_addr_equal(&a->in6, &b->in6);
152#endif
153 return a->ip == b->ip;
154}
155
156#ifdef CONFIG_IP_VS_DEBUG
157#include <linux/net.h>
158
159extern int ip_vs_get_debug_level(void);
160
161static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
162 const union nf_inet_addr *addr,
163 int *idx)
164{
165 int len;
166#ifdef CONFIG_IP_VS_IPV6
167 if (af == AF_INET6)
168 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
169 &addr->in6) + 1;
170 else
171#endif
172 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
173 &addr->ip) + 1;
174
175 *idx += len;
176 BUG_ON(*idx > buf_len + 1);
177 return &buf[*idx - len];
178}
179
180#define IP_VS_DBG_BUF(level, msg, ...) \
181 do { \
182 char ip_vs_dbg_buf[160]; \
183 int ip_vs_dbg_idx = 0; \
184 if (level <= ip_vs_get_debug_level()) \
185 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
186 } while (0)
187#define IP_VS_ERR_BUF(msg...) \
188 do { \
189 char ip_vs_dbg_buf[160]; \
190 int ip_vs_dbg_idx = 0; \
191 pr_err(msg); \
192 } while (0)
193
194/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
195#define IP_VS_DBG_ADDR(af, addr) \
196 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
197 sizeof(ip_vs_dbg_buf), addr, \
198 &ip_vs_dbg_idx)
199
200#define IP_VS_DBG(level, msg, ...) \
201 do { \
202 if (level <= ip_vs_get_debug_level()) \
203 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
204 } while (0)
205#define IP_VS_DBG_RL(msg, ...) \
206 do { \
207 if (net_ratelimit()) \
208 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
209 } while (0)
210#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
211 do { \
212 if (level <= ip_vs_get_debug_level()) \
213 pp->debug_packet(af, pp, skb, ofs, msg); \
214 } while (0)
215#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
216 do { \
217 if (level <= ip_vs_get_debug_level() && \
218 net_ratelimit()) \
219 pp->debug_packet(af, pp, skb, ofs, msg); \
220 } while (0)
221#else /* NO DEBUGGING at ALL */
222#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
223#define IP_VS_ERR_BUF(msg...) do {} while (0)
224#define IP_VS_DBG(level, msg...) do {} while (0)
225#define IP_VS_DBG_RL(msg...) do {} while (0)
226#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
227#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
228#endif
229
230#define IP_VS_BUG() BUG()
231#define IP_VS_ERR_RL(msg, ...) \
232 do { \
233 if (net_ratelimit()) \
234 pr_err(msg, ##__VA_ARGS__); \
235 } while (0)
236
237#ifdef CONFIG_IP_VS_DEBUG
238#define EnterFunction(level) \
239 do { \
240 if (level <= ip_vs_get_debug_level()) \
241 printk(KERN_DEBUG \
242 pr_fmt("Enter: %s, %s line %i\n"), \
243 __func__, __FILE__, __LINE__); \
244 } while (0)
245#define LeaveFunction(level) \
246 do { \
247 if (level <= ip_vs_get_debug_level()) \
248 printk(KERN_DEBUG \
249 pr_fmt("Leave: %s, %s line %i\n"), \
250 __func__, __FILE__, __LINE__); \
251 } while (0)
252#else
253#define EnterFunction(level) do {} while (0)
254#define LeaveFunction(level) do {} while (0)
255#endif
256
257#define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
258
259
260/*
261 * The port number of FTP service (in network order).
262 */
263#define FTPPORT cpu_to_be16(21)
264#define FTPDATA cpu_to_be16(20)
265
266/*
267 * TCP State Values
268 */
269enum {
270 IP_VS_TCP_S_NONE = 0,
271 IP_VS_TCP_S_ESTABLISHED,
272 IP_VS_TCP_S_SYN_SENT,
273 IP_VS_TCP_S_SYN_RECV,
274 IP_VS_TCP_S_FIN_WAIT,
275 IP_VS_TCP_S_TIME_WAIT,
276 IP_VS_TCP_S_CLOSE,
277 IP_VS_TCP_S_CLOSE_WAIT,
278 IP_VS_TCP_S_LAST_ACK,
279 IP_VS_TCP_S_LISTEN,
280 IP_VS_TCP_S_SYNACK,
281 IP_VS_TCP_S_LAST
282};
283
284/*
285 * UDP State Values
286 */
287enum {
288 IP_VS_UDP_S_NORMAL,
289 IP_VS_UDP_S_LAST,
290};
291
292/*
293 * ICMP State Values
294 */
295enum {
296 IP_VS_ICMP_S_NORMAL,
297 IP_VS_ICMP_S_LAST,
298};
299
300/*
301 * SCTP State Values
302 */
303enum ip_vs_sctp_states {
304 IP_VS_SCTP_S_NONE,
305 IP_VS_SCTP_S_INIT_CLI,
306 IP_VS_SCTP_S_INIT_SER,
307 IP_VS_SCTP_S_INIT_ACK_CLI,
308 IP_VS_SCTP_S_INIT_ACK_SER,
309 IP_VS_SCTP_S_ECHO_CLI,
310 IP_VS_SCTP_S_ECHO_SER,
311 IP_VS_SCTP_S_ESTABLISHED,
312 IP_VS_SCTP_S_SHUT_CLI,
313 IP_VS_SCTP_S_SHUT_SER,
314 IP_VS_SCTP_S_SHUT_ACK_CLI,
315 IP_VS_SCTP_S_SHUT_ACK_SER,
316 IP_VS_SCTP_S_CLOSED,
317 IP_VS_SCTP_S_LAST
318};
319
320/*
321 * Delta sequence info structure
322 * Each ip_vs_conn has 2 (output AND input seq. changes).
323 * Only used in the VS/NAT.
324 */
325struct ip_vs_seq {
326 __u32 init_seq; /* Add delta from this seq */
327 __u32 delta; /* Delta in sequence numbers */
328 __u32 previous_delta; /* Delta in sequence numbers
329 before last resized pkt */
330};
331
332/*
333 * counters per cpu
334 */
335struct ip_vs_counters {
336 __u32 conns; /* connections scheduled */
337 __u32 inpkts; /* incoming packets */
338 __u32 outpkts; /* outgoing packets */
339 __u64 inbytes; /* incoming bytes */
340 __u64 outbytes; /* outgoing bytes */
341};
342/*
343 * Stats per cpu
344 */
345struct ip_vs_cpu_stats {
346 struct ip_vs_counters ustats;
347 struct u64_stats_sync syncp;
348};
349
350/*
351 * IPVS statistics objects
352 */
353struct ip_vs_estimator {
354 struct list_head list;
355
356 u64 last_inbytes;
357 u64 last_outbytes;
358 u32 last_conns;
359 u32 last_inpkts;
360 u32 last_outpkts;
361
362 u32 cps;
363 u32 inpps;
364 u32 outpps;
365 u32 inbps;
366 u32 outbps;
367};
368
369struct ip_vs_stats {
370 struct ip_vs_stats_user ustats; /* statistics */
371 struct ip_vs_estimator est; /* estimator */
372 struct ip_vs_cpu_stats *cpustats; /* per cpu counters */
373 spinlock_t lock; /* spin lock */
374 struct ip_vs_stats_user ustats0; /* reset values */
375};
376
377struct dst_entry;
378struct iphdr;
379struct ip_vs_conn;
380struct ip_vs_app;
381struct sk_buff;
382struct ip_vs_proto_data;
383
384struct ip_vs_protocol {
385 struct ip_vs_protocol *next;
386 char *name;
387 u16 protocol;
388 u16 num_states;
389 int dont_defrag;
390
391 void (*init)(struct ip_vs_protocol *pp);
392
393 void (*exit)(struct ip_vs_protocol *pp);
394
395 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
396
397 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
398
399 int (*conn_schedule)(int af, struct sk_buff *skb,
400 struct ip_vs_proto_data *pd,
401 int *verdict, struct ip_vs_conn **cpp);
402
403 struct ip_vs_conn *
404 (*conn_in_get)(int af,
405 const struct sk_buff *skb,
406 const struct ip_vs_iphdr *iph,
407 unsigned int proto_off,
408 int inverse);
409
410 struct ip_vs_conn *
411 (*conn_out_get)(int af,
412 const struct sk_buff *skb,
413 const struct ip_vs_iphdr *iph,
414 unsigned int proto_off,
415 int inverse);
416
417 int (*snat_handler)(struct sk_buff *skb,
418 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
419
420 int (*dnat_handler)(struct sk_buff *skb,
421 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
422
423 int (*csum_check)(int af, struct sk_buff *skb,
424 struct ip_vs_protocol *pp);
425
426 const char *(*state_name)(int state);
427
428 void (*state_transition)(struct ip_vs_conn *cp, int direction,
429 const struct sk_buff *skb,
430 struct ip_vs_proto_data *pd);
431
432 int (*register_app)(struct net *net, struct ip_vs_app *inc);
433
434 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
435
436 int (*app_conn_bind)(struct ip_vs_conn *cp);
437
438 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
439 const struct sk_buff *skb,
440 int offset,
441 const char *msg);
442
443 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
444};
445
446/*
447 * protocol data per netns
448 */
449struct ip_vs_proto_data {
450 struct ip_vs_proto_data *next;
451 struct ip_vs_protocol *pp;
452 int *timeout_table; /* protocol timeout table */
453 atomic_t appcnt; /* counter of proto app incs. */
454 struct tcp_states_t *tcp_state_table;
455};
456
457extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
458extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
459 unsigned short proto);
460
461struct ip_vs_conn_param {
462 struct net *net;
463 const union nf_inet_addr *caddr;
464 const union nf_inet_addr *vaddr;
465 __be16 cport;
466 __be16 vport;
467 __u16 protocol;
468 u16 af;
469
470 const struct ip_vs_pe *pe;
471 char *pe_data;
472 __u8 pe_data_len;
473};
474
475/*
476 * IP_VS structure allocated for each dynamically scheduled connection
477 */
478struct ip_vs_conn {
479 struct hlist_node c_list; /* hashed list heads */
480#ifdef CONFIG_NET_NS
481 struct net *net; /* Name space */
482#endif
483 /* Protocol, addresses and port numbers */
484 u16 af; /* address family */
485 __be16 cport;
486 __be16 vport;
487 __be16 dport;
488 __u32 fwmark; /* Fire wall mark from skb */
489 union nf_inet_addr caddr; /* client address */
490 union nf_inet_addr vaddr; /* virtual address */
491 union nf_inet_addr daddr; /* destination address */
492 volatile __u32 flags; /* status flags */
493 __u16 protocol; /* Which protocol (TCP/UDP) */
494
495 /* counter and timer */
496 atomic_t refcnt; /* reference count */
497 struct timer_list timer; /* Expiration timer */
498 volatile unsigned long timeout; /* timeout */
499
500 /* Flags and state transition */
501 spinlock_t lock; /* lock for state transition */
502 volatile __u16 state; /* state info */
503 volatile __u16 old_state; /* old state, to be used for
504 * state transition triggerd
505 * synchronization
506 */
507 unsigned long sync_endtime; /* jiffies + sent_retries */
508
509 /* Control members */
510 struct ip_vs_conn *control; /* Master control connection */
511 atomic_t n_control; /* Number of controlled ones */
512 struct ip_vs_dest *dest; /* real server */
513 atomic_t in_pkts; /* incoming packet counter */
514
515 /* packet transmitter for different forwarding methods. If it
516 mangles the packet, it must return NF_DROP or better NF_STOLEN,
517 otherwise this must be changed to a sk_buff **.
518 NF_ACCEPT can be returned when destination is local.
519 */
520 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
521 struct ip_vs_protocol *pp);
522
523 /* Note: we can group the following members into a structure,
524 in order to save more space, and the following members are
525 only used in VS/NAT anyway */
526 struct ip_vs_app *app; /* bound ip_vs_app object */
527 void *app_data; /* Application private data */
528 struct ip_vs_seq in_seq; /* incoming seq. struct */
529 struct ip_vs_seq out_seq; /* outgoing seq. struct */
530
531 const struct ip_vs_pe *pe;
532 char *pe_data;
533 __u8 pe_data_len;
534};
535
536/*
537 * To save some memory in conn table when name space is disabled.
538 */
539static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
540{
541#ifdef CONFIG_NET_NS
542 return cp->net;
543#else
544 return &init_net;
545#endif
546}
547static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
548{
549#ifdef CONFIG_NET_NS
550 cp->net = net;
551#endif
552}
553
554static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
555 struct net *net)
556{
557#ifdef CONFIG_NET_NS
558 return cp->net == net;
559#else
560 return 1;
561#endif
562}
563
564/*
565 * Extended internal versions of struct ip_vs_service_user and
566 * ip_vs_dest_user for IPv6 support.
567 *
568 * We need these to conveniently pass around service and destination
569 * options, but unfortunately, we also need to keep the old definitions to
570 * maintain userspace backwards compatibility for the setsockopt interface.
571 */
572struct ip_vs_service_user_kern {
573 /* virtual service addresses */
574 u16 af;
575 u16 protocol;
576 union nf_inet_addr addr; /* virtual ip address */
577 u16 port;
578 u32 fwmark; /* firwall mark of service */
579
580 /* virtual service options */
581 char *sched_name;
582 char *pe_name;
583 unsigned int flags; /* virtual service flags */
584 unsigned int timeout; /* persistent timeout in sec */
585 u32 netmask; /* persistent netmask */
586};
587
588
589struct ip_vs_dest_user_kern {
590 /* destination server address */
591 union nf_inet_addr addr;
592 u16 port;
593
594 /* real server options */
595 unsigned int conn_flags; /* connection flags */
596 int weight; /* destination weight */
597
598 /* thresholds for active connections */
599 u32 u_threshold; /* upper threshold */
600 u32 l_threshold; /* lower threshold */
601};
602
603
604/*
605 * The information about the virtual service offered to the net
606 * and the forwarding entries
607 */
608struct ip_vs_service {
609 struct list_head s_list; /* for normal service table */
610 struct list_head f_list; /* for fwmark-based service table */
611 atomic_t refcnt; /* reference counter */
612 atomic_t usecnt; /* use counter */
613
614 u16 af; /* address family */
615 __u16 protocol; /* which protocol (TCP/UDP) */
616 union nf_inet_addr addr; /* IP address for virtual service */
617 __be16 port; /* port number for the service */
618 __u32 fwmark; /* firewall mark of the service */
619 unsigned int flags; /* service status flags */
620 unsigned int timeout; /* persistent timeout in ticks */
621 __be32 netmask; /* grouping granularity */
622 struct net *net;
623
624 struct list_head destinations; /* real server d-linked list */
625 __u32 num_dests; /* number of servers */
626 struct ip_vs_stats stats; /* statistics for the service */
627 struct ip_vs_app *inc; /* bind conns to this app inc */
628
629 /* for scheduling */
630 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
631 rwlock_t sched_lock; /* lock sched_data */
632 void *sched_data; /* scheduler application data */
633
634 /* alternate persistence engine */
635 struct ip_vs_pe *pe;
636};
637
638
639/*
640 * The real server destination forwarding entry
641 * with ip address, port number, and so on.
642 */
643struct ip_vs_dest {
644 struct list_head n_list; /* for the dests in the service */
645 struct list_head d_list; /* for table with all the dests */
646
647 u16 af; /* address family */
648 __be16 port; /* port number of the server */
649 union nf_inet_addr addr; /* IP address of the server */
650 volatile unsigned int flags; /* dest status flags */
651 atomic_t conn_flags; /* flags to copy to conn */
652 atomic_t weight; /* server weight */
653
654 atomic_t refcnt; /* reference counter */
655 struct ip_vs_stats stats; /* statistics */
656
657 /* connection counters and thresholds */
658 atomic_t activeconns; /* active connections */
659 atomic_t inactconns; /* inactive connections */
660 atomic_t persistconns; /* persistent connections */
661 __u32 u_threshold; /* upper threshold */
662 __u32 l_threshold; /* lower threshold */
663
664 /* for destination cache */
665 spinlock_t dst_lock; /* lock of dst_cache */
666 struct dst_entry *dst_cache; /* destination cache entry */
667 u32 dst_rtos; /* RT_TOS(tos) for dst */
668 u32 dst_cookie;
669 union nf_inet_addr dst_saddr;
670
671 /* for virtual service */
672 struct ip_vs_service *svc; /* service it belongs to */
673 __u16 protocol; /* which protocol (TCP/UDP) */
674 __be16 vport; /* virtual port number */
675 union nf_inet_addr vaddr; /* virtual IP address */
676 __u32 vfwmark; /* firewall mark of service */
677};
678
679
680/*
681 * The scheduler object
682 */
683struct ip_vs_scheduler {
684 struct list_head n_list; /* d-linked list head */
685 char *name; /* scheduler name */
686 atomic_t refcnt; /* reference counter */
687 struct module *module; /* THIS_MODULE/NULL */
688
689 /* scheduler initializing service */
690 int (*init_service)(struct ip_vs_service *svc);
691 /* scheduling service finish */
692 int (*done_service)(struct ip_vs_service *svc);
693 /* scheduler updating service */
694 int (*update_service)(struct ip_vs_service *svc);
695
696 /* selecting a server from the given service */
697 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
698 const struct sk_buff *skb);
699};
700
701/* The persistence engine object */
702struct ip_vs_pe {
703 struct list_head n_list; /* d-linked list head */
704 char *name; /* scheduler name */
705 atomic_t refcnt; /* reference counter */
706 struct module *module; /* THIS_MODULE/NULL */
707
708 /* get the connection template, if any */
709 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
710 bool (*ct_match)(const struct ip_vs_conn_param *p,
711 struct ip_vs_conn *ct);
712 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
713 bool inverse);
714 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
715};
716
717/*
718 * The application module object (a.k.a. app incarnation)
719 */
720struct ip_vs_app {
721 struct list_head a_list; /* member in app list */
722 int type; /* IP_VS_APP_TYPE_xxx */
723 char *name; /* application module name */
724 __u16 protocol;
725 struct module *module; /* THIS_MODULE/NULL */
726 struct list_head incs_list; /* list of incarnations */
727
728 /* members for application incarnations */
729 struct list_head p_list; /* member in proto app list */
730 struct ip_vs_app *app; /* its real application */
731 __be16 port; /* port number in net order */
732 atomic_t usecnt; /* usage counter */
733
734 /*
735 * output hook: Process packet in inout direction, diff set for TCP.
736 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
737 * 2=Mangled but checksum was not updated
738 */
739 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
740 struct sk_buff *, int *diff);
741
742 /*
743 * input hook: Process packet in outin direction, diff set for TCP.
744 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
745 * 2=Mangled but checksum was not updated
746 */
747 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
748 struct sk_buff *, int *diff);
749
750 /* ip_vs_app initializer */
751 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
752
753 /* ip_vs_app finish */
754 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
755
756
757 /* not used now */
758 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
759 struct ip_vs_protocol *);
760
761 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
762
763 int * timeout_table;
764 int * timeouts;
765 int timeouts_size;
766
767 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
768 int *verdict, struct ip_vs_conn **cpp);
769
770 struct ip_vs_conn *
771 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
772 const struct iphdr *iph, unsigned int proto_off,
773 int inverse);
774
775 struct ip_vs_conn *
776 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
777 const struct iphdr *iph, unsigned int proto_off,
778 int inverse);
779
780 int (*state_transition)(struct ip_vs_conn *cp, int direction,
781 const struct sk_buff *skb,
782 struct ip_vs_app *app);
783
784 void (*timeout_change)(struct ip_vs_app *app, int flags);
785};
786
787struct ipvs_master_sync_state {
788 struct list_head sync_queue;
789 struct ip_vs_sync_buff *sync_buff;
790 int sync_queue_len;
791 unsigned int sync_queue_delay;
792 struct task_struct *master_thread;
793 struct delayed_work master_wakeup_work;
794 struct netns_ipvs *ipvs;
795};
796
797/* IPVS in network namespace */
798struct netns_ipvs {
799 int gen; /* Generation */
800 int enable; /* enable like nf_hooks do */
801 /*
802 * Hash table: for real service lookups
803 */
804 #define IP_VS_RTAB_BITS 4
805 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
806 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
807
808 struct list_head rs_table[IP_VS_RTAB_SIZE];
809 /* ip_vs_app */
810 struct list_head app_list;
811 /* ip_vs_ftp */
812 struct ip_vs_app *ftp_app;
813 /* ip_vs_proto */
814 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
815 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
816 /* ip_vs_proto_tcp */
817#ifdef CONFIG_IP_VS_PROTO_TCP
818 #define TCP_APP_TAB_BITS 4
819 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
820 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
821 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
822 spinlock_t tcp_app_lock;
823#endif
824 /* ip_vs_proto_udp */
825#ifdef CONFIG_IP_VS_PROTO_UDP
826 #define UDP_APP_TAB_BITS 4
827 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
828 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
829 struct list_head udp_apps[UDP_APP_TAB_SIZE];
830 spinlock_t udp_app_lock;
831#endif
832 /* ip_vs_proto_sctp */
833#ifdef CONFIG_IP_VS_PROTO_SCTP
834 #define SCTP_APP_TAB_BITS 4
835 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
836 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
837 /* Hash table for SCTP application incarnations */
838 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
839 spinlock_t sctp_app_lock;
840#endif
841 /* ip_vs_conn */
842 atomic_t conn_count; /* connection counter */
843
844 /* ip_vs_ctl */
845 struct ip_vs_stats tot_stats; /* Statistics & est. */
846
847 int num_services; /* no of virtual services */
848
849 rwlock_t rs_lock; /* real services table */
850 /* Trash for destinations */
851 struct list_head dest_trash;
852 /* Service counters */
853 atomic_t ftpsvc_counter;
854 atomic_t nullsvc_counter;
855
856#ifdef CONFIG_SYSCTL
857 /* 1/rate drop and drop-entry variables */
858 struct delayed_work defense_work; /* Work handler */
859 int drop_rate;
860 int drop_counter;
861 atomic_t dropentry;
862 /* locks in ctl.c */
863 spinlock_t dropentry_lock; /* drop entry handling */
864 spinlock_t droppacket_lock; /* drop packet handling */
865 spinlock_t securetcp_lock; /* state and timeout tables */
866
867 /* sys-ctl struct */
868 struct ctl_table_header *sysctl_hdr;
869 struct ctl_table *sysctl_tbl;
870#endif
871
872 /* sysctl variables */
873 int sysctl_amemthresh;
874 int sysctl_am_droprate;
875 int sysctl_drop_entry;
876 int sysctl_drop_packet;
877 int sysctl_secure_tcp;
878#ifdef CONFIG_IP_VS_NFCT
879 int sysctl_conntrack;
880#endif
881 int sysctl_snat_reroute;
882 int sysctl_sync_ver;
883 int sysctl_sync_ports;
884 int sysctl_sync_qlen_max;
885 int sysctl_sync_sock_size;
886 int sysctl_cache_bypass;
887 int sysctl_expire_nodest_conn;
888 int sysctl_expire_quiescent_template;
889 int sysctl_sync_threshold[2];
890 unsigned int sysctl_sync_refresh_period;
891 int sysctl_sync_retries;
892 int sysctl_nat_icmp_send;
893
894 /* ip_vs_lblc */
895 int sysctl_lblc_expiration;
896 struct ctl_table_header *lblc_ctl_header;
897 struct ctl_table *lblc_ctl_table;
898 /* ip_vs_lblcr */
899 int sysctl_lblcr_expiration;
900 struct ctl_table_header *lblcr_ctl_header;
901 struct ctl_table *lblcr_ctl_table;
902 /* ip_vs_est */
903 struct list_head est_list; /* estimator list */
904 spinlock_t est_lock;
905 struct timer_list est_timer; /* Estimation timer */
906 /* ip_vs_sync */
907 spinlock_t sync_lock;
908 struct ipvs_master_sync_state *ms;
909 spinlock_t sync_buff_lock;
910 struct task_struct **backup_threads;
911 int threads_mask;
912 int send_mesg_maxlen;
913 int recv_mesg_maxlen;
914 volatile int sync_state;
915 volatile int master_syncid;
916 volatile int backup_syncid;
917 struct mutex sync_mutex;
918 /* multicast interface name */
919 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
920 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
921 /* net name space ptr */
922 struct net *net; /* Needed by timer routines */
923};
924
925#define DEFAULT_SYNC_THRESHOLD 3
926#define DEFAULT_SYNC_PERIOD 50
927#define DEFAULT_SYNC_VER 1
928#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
929#define DEFAULT_SYNC_RETRIES 0
930#define IPVS_SYNC_WAKEUP_RATE 8
931#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
932#define IPVS_SYNC_SEND_DELAY (HZ / 50)
933#define IPVS_SYNC_CHECK_PERIOD HZ
934#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
935#define IPVS_SYNC_PORTS_MAX (1 << 6)
936
937#ifdef CONFIG_SYSCTL
938
939static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
940{
941 return ipvs->sysctl_sync_threshold[0];
942}
943
944static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
945{
946 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
947}
948
949static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
950{
951 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
952}
953
954static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
955{
956 return ipvs->sysctl_sync_retries;
957}
958
959static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
960{
961 return ipvs->sysctl_sync_ver;
962}
963
964static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
965{
966 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
967}
968
969static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
970{
971 return ipvs->sysctl_sync_qlen_max;
972}
973
974static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
975{
976 return ipvs->sysctl_sync_sock_size;
977}
978
979#else
980
981static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
982{
983 return DEFAULT_SYNC_THRESHOLD;
984}
985
986static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
987{
988 return DEFAULT_SYNC_PERIOD;
989}
990
991static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
992{
993 return DEFAULT_SYNC_REFRESH_PERIOD;
994}
995
996static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
997{
998 return DEFAULT_SYNC_RETRIES & 3;
999}
1000
1001static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1002{
1003 return DEFAULT_SYNC_VER;
1004}
1005
1006static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1007{
1008 return 1;
1009}
1010
1011static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1012{
1013 return IPVS_SYNC_QLEN_MAX;
1014}
1015
1016static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1017{
1018 return 0;
1019}
1020
1021#endif
1022
1023/*
1024 * IPVS core functions
1025 * (from ip_vs_core.c)
1026 */
1027extern const char *ip_vs_proto_name(unsigned int proto);
1028extern void ip_vs_init_hash_table(struct list_head *table, int rows);
1029#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1030
1031#define IP_VS_APP_TYPE_FTP 1
1032
1033/*
1034 * ip_vs_conn handling functions
1035 * (from ip_vs_conn.c)
1036 */
1037
1038enum {
1039 IP_VS_DIR_INPUT = 0,
1040 IP_VS_DIR_OUTPUT,
1041 IP_VS_DIR_INPUT_ONLY,
1042 IP_VS_DIR_LAST,
1043};
1044
1045static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1046 const union nf_inet_addr *caddr,
1047 __be16 cport,
1048 const union nf_inet_addr *vaddr,
1049 __be16 vport,
1050 struct ip_vs_conn_param *p)
1051{
1052 p->net = net;
1053 p->af = af;
1054 p->protocol = protocol;
1055 p->caddr = caddr;
1056 p->cport = cport;
1057 p->vaddr = vaddr;
1058 p->vport = vport;
1059 p->pe = NULL;
1060 p->pe_data = NULL;
1061}
1062
1063struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1064struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1065
1066struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1067 const struct ip_vs_iphdr *iph,
1068 unsigned int proto_off,
1069 int inverse);
1070
1071struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1072
1073struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1074 const struct ip_vs_iphdr *iph,
1075 unsigned int proto_off,
1076 int inverse);
1077
1078/* put back the conn without restarting its timer */
1079static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1080{
1081 atomic_dec(&cp->refcnt);
1082}
1083extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1084extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1085
1086struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1087 const union nf_inet_addr *daddr,
1088 __be16 dport, unsigned int flags,
1089 struct ip_vs_dest *dest, __u32 fwmark);
1090extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1091
1092extern const char * ip_vs_state_name(__u16 proto, int state);
1093
1094extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1095extern int ip_vs_check_template(struct ip_vs_conn *ct);
1096extern void ip_vs_random_dropentry(struct net *net);
1097extern int ip_vs_conn_init(void);
1098extern void ip_vs_conn_cleanup(void);
1099
1100static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1101{
1102 struct ip_vs_conn *ctl_cp = cp->control;
1103 if (!ctl_cp) {
1104 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1105 "%s:%d to %s:%d\n",
1106 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1107 ntohs(cp->cport),
1108 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1109 ntohs(cp->vport));
1110
1111 return;
1112 }
1113
1114 IP_VS_DBG_BUF(7, "DELeting control for: "
1115 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1116 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1117 ntohs(cp->cport),
1118 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1119 ntohs(ctl_cp->cport));
1120
1121 cp->control = NULL;
1122 if (atomic_read(&ctl_cp->n_control) == 0) {
1123 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1124 "%s:%d to %s:%d\n",
1125 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1126 ntohs(cp->cport),
1127 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1128 ntohs(cp->vport));
1129
1130 return;
1131 }
1132 atomic_dec(&ctl_cp->n_control);
1133}
1134
1135static inline void
1136ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1137{
1138 if (cp->control) {
1139 IP_VS_ERR_BUF("request control ADD for already controlled: "
1140 "%s:%d to %s:%d\n",
1141 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1142 ntohs(cp->cport),
1143 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1144 ntohs(cp->vport));
1145
1146 ip_vs_control_del(cp);
1147 }
1148
1149 IP_VS_DBG_BUF(7, "ADDing control for: "
1150 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1151 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1152 ntohs(cp->cport),
1153 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1154 ntohs(ctl_cp->cport));
1155
1156 cp->control = ctl_cp;
1157 atomic_inc(&ctl_cp->n_control);
1158}
1159
1160/*
1161 * IPVS netns init & cleanup functions
1162 */
1163extern int ip_vs_estimator_net_init(struct net *net);
1164extern int ip_vs_control_net_init(struct net *net);
1165extern int ip_vs_protocol_net_init(struct net *net);
1166extern int ip_vs_app_net_init(struct net *net);
1167extern int ip_vs_conn_net_init(struct net *net);
1168extern int ip_vs_sync_net_init(struct net *net);
1169extern void ip_vs_conn_net_cleanup(struct net *net);
1170extern void ip_vs_app_net_cleanup(struct net *net);
1171extern void ip_vs_protocol_net_cleanup(struct net *net);
1172extern void ip_vs_control_net_cleanup(struct net *net);
1173extern void ip_vs_estimator_net_cleanup(struct net *net);
1174extern void ip_vs_sync_net_cleanup(struct net *net);
1175extern void ip_vs_service_net_cleanup(struct net *net);
1176
1177/*
1178 * IPVS application functions
1179 * (from ip_vs_app.c)
1180 */
1181#define IP_VS_APP_MAX_PORTS 8
1182extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1183extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1184extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1185extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1186extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1187 __u16 proto, __u16 port);
1188extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1189extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1190
1191extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1192extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1193
1194void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1195void ip_vs_unbind_pe(struct ip_vs_service *svc);
1196int register_ip_vs_pe(struct ip_vs_pe *pe);
1197int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1198struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1199struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1200
1201/*
1202 * Use a #define to avoid all of module.h just for these trivial ops
1203 */
1204#define ip_vs_pe_get(pe) \
1205 if (pe && pe->module) \
1206 __module_get(pe->module);
1207
1208#define ip_vs_pe_put(pe) \
1209 if (pe && pe->module) \
1210 module_put(pe->module);
1211
1212/*
1213 * IPVS protocol functions (from ip_vs_proto.c)
1214 */
1215extern int ip_vs_protocol_init(void);
1216extern void ip_vs_protocol_cleanup(void);
1217extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1218extern int *ip_vs_create_timeout_table(int *table, int size);
1219extern int
1220ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1221 const char *name, int to);
1222extern void
1223ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1224 const struct sk_buff *skb,
1225 int offset, const char *msg);
1226
1227extern struct ip_vs_protocol ip_vs_protocol_tcp;
1228extern struct ip_vs_protocol ip_vs_protocol_udp;
1229extern struct ip_vs_protocol ip_vs_protocol_icmp;
1230extern struct ip_vs_protocol ip_vs_protocol_esp;
1231extern struct ip_vs_protocol ip_vs_protocol_ah;
1232extern struct ip_vs_protocol ip_vs_protocol_sctp;
1233
1234/*
1235 * Registering/unregistering scheduler functions
1236 * (from ip_vs_sched.c)
1237 */
1238extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1239extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1240extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1241 struct ip_vs_scheduler *scheduler);
1242extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1243extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1244extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1245extern struct ip_vs_conn *
1246ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1247 struct ip_vs_proto_data *pd, int *ignored);
1248extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1249 struct ip_vs_proto_data *pd);
1250
1251extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1252
1253
1254/*
1255 * IPVS control data and functions (from ip_vs_ctl.c)
1256 */
1257extern struct ip_vs_stats ip_vs_stats;
1258extern int sysctl_ip_vs_sync_ver;
1259
1260extern struct ip_vs_service *
1261ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1262 const union nf_inet_addr *vaddr, __be16 vport);
1263
1264static inline void ip_vs_service_put(struct ip_vs_service *svc)
1265{
1266 atomic_dec(&svc->usecnt);
1267}
1268
1269extern struct ip_vs_dest *
1270ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1271 const union nf_inet_addr *daddr, __be16 dport);
1272
1273extern int ip_vs_use_count_inc(void);
1274extern void ip_vs_use_count_dec(void);
1275extern int ip_vs_register_nl_ioctl(void);
1276extern void ip_vs_unregister_nl_ioctl(void);
1277extern int ip_vs_control_init(void);
1278extern void ip_vs_control_cleanup(void);
1279extern struct ip_vs_dest *
1280ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1281 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1282 __u16 protocol, __u32 fwmark, __u32 flags);
1283extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1284
1285
1286/*
1287 * IPVS sync daemon data and function prototypes
1288 * (from ip_vs_sync.c)
1289 */
1290extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1291 __u8 syncid);
1292extern int stop_sync_thread(struct net *net, int state);
1293extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1294
1295
1296/*
1297 * IPVS rate estimator prototypes (from ip_vs_est.c)
1298 */
1299extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1300extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1301extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1302extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1303 struct ip_vs_stats *stats);
1304
1305/*
1306 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1307 */
1308extern int ip_vs_null_xmit
1309(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1310extern int ip_vs_bypass_xmit
1311(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1312extern int ip_vs_nat_xmit
1313(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1314extern int ip_vs_tunnel_xmit
1315(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1316extern int ip_vs_dr_xmit
1317(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1318extern int ip_vs_icmp_xmit
1319(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1320 int offset, unsigned int hooknum);
1321extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1322
1323#ifdef CONFIG_IP_VS_IPV6
1324extern int ip_vs_bypass_xmit_v6
1325(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1326extern int ip_vs_nat_xmit_v6
1327(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1328extern int ip_vs_tunnel_xmit_v6
1329(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1330extern int ip_vs_dr_xmit_v6
1331(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1332extern int ip_vs_icmp_xmit_v6
1333(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1334 int offset, unsigned int hooknum);
1335#endif
1336
1337#ifdef CONFIG_SYSCTL
1338/*
1339 * This is a simple mechanism to ignore packets when
1340 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1341 * we start to drop 1/rate of the packets
1342 */
1343
1344static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1345{
1346 if (!ipvs->drop_rate)
1347 return 0;
1348 if (--ipvs->drop_counter > 0)
1349 return 0;
1350 ipvs->drop_counter = ipvs->drop_rate;
1351 return 1;
1352}
1353#else
1354static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1355#endif
1356
1357/*
1358 * ip_vs_fwd_tag returns the forwarding tag of the connection
1359 */
1360#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1361
1362static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1363{
1364 char fwd;
1365
1366 switch (IP_VS_FWD_METHOD(cp)) {
1367 case IP_VS_CONN_F_MASQ:
1368 fwd = 'M'; break;
1369 case IP_VS_CONN_F_LOCALNODE:
1370 fwd = 'L'; break;
1371 case IP_VS_CONN_F_TUNNEL:
1372 fwd = 'T'; break;
1373 case IP_VS_CONN_F_DROUTE:
1374 fwd = 'R'; break;
1375 case IP_VS_CONN_F_BYPASS:
1376 fwd = 'B'; break;
1377 default:
1378 fwd = '?'; break;
1379 }
1380 return fwd;
1381}
1382
1383extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1384 struct ip_vs_conn *cp, int dir);
1385
1386#ifdef CONFIG_IP_VS_IPV6
1387extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1388 struct ip_vs_conn *cp, int dir);
1389#endif
1390
1391extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1392
1393static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1394{
1395 __be32 diff[2] = { ~old, new };
1396
1397 return csum_partial(diff, sizeof(diff), oldsum);
1398}
1399
1400#ifdef CONFIG_IP_VS_IPV6
1401static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1402 __wsum oldsum)
1403{
1404 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1405 new[3], new[2], new[1], new[0] };
1406
1407 return csum_partial(diff, sizeof(diff), oldsum);
1408}
1409#endif
1410
1411static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1412{
1413 __be16 diff[2] = { ~old, new };
1414
1415 return csum_partial(diff, sizeof(diff), oldsum);
1416}
1417
1418/*
1419 * Forget current conntrack (unconfirmed) and attach notrack entry
1420 */
1421static inline void ip_vs_notrack(struct sk_buff *skb)
1422{
1423#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1424 enum ip_conntrack_info ctinfo;
1425 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1426
1427 if (!ct || !nf_ct_is_untracked(ct)) {
1428 nf_conntrack_put(skb->nfct);
1429 skb->nfct = &nf_ct_untracked_get()->ct_general;
1430 skb->nfctinfo = IP_CT_NEW;
1431 nf_conntrack_get(skb->nfct);
1432 }
1433#endif
1434}
1435
1436#ifdef CONFIG_IP_VS_NFCT
1437/*
1438 * Netfilter connection tracking
1439 * (from ip_vs_nfct.c)
1440 */
1441static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1442{
1443#ifdef CONFIG_SYSCTL
1444 return ipvs->sysctl_conntrack;
1445#else
1446 return 0;
1447#endif
1448}
1449
1450extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1451 int outin);
1452extern int ip_vs_confirm_conntrack(struct sk_buff *skb);
1453extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1454 struct ip_vs_conn *cp, u_int8_t proto,
1455 const __be16 port, int from_rs);
1456extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1457
1458#else
1459
1460static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1461{
1462 return 0;
1463}
1464
1465static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1466 struct ip_vs_conn *cp, int outin)
1467{
1468}
1469
1470static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1471{
1472 return NF_ACCEPT;
1473}
1474
1475static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1476{
1477}
1478/* CONFIG_IP_VS_NFCT */
1479#endif
1480
1481static inline unsigned int
1482ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1483{
1484 /*
1485 * We think the overhead of processing active connections is 256
1486 * times higher than that of inactive connections in average. (This
1487 * 256 times might not be accurate, we will change it later) We
1488 * use the following formula to estimate the overhead now:
1489 * dest->activeconns*256 + dest->inactconns
1490 */
1491 return (atomic_read(&dest->activeconns) << 8) +
1492 atomic_read(&dest->inactconns);
1493}
1494
1495#endif /* _NET_IP_VS_H */