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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/* SPDX-License-Identifier: GPL-2.0 */
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/refcount.h> /* for struct refcount_t */
17
18#include <linux/compiler.h>
19#include <linux/timer.h>
20#include <linux/bug.h>
21
22#include <net/checksum.h>
23#include <linux/netfilter.h> /* for union nf_inet_addr */
24#include <linux/ip.h>
25#include <linux/ipv6.h> /* for struct ipv6hdr */
26#include <net/ipv6.h>
27#if IS_ENABLED(CONFIG_IP_VS_IPV6)
28#include <linux/netfilter_ipv6/ip6_tables.h>
29#endif
30#if IS_ENABLED(CONFIG_NF_CONNTRACK)
31#include <net/netfilter/nf_conntrack.h>
32#endif
33#include <net/net_namespace.h> /* Netw namespace */
34
35#define IP_VS_HDR_INVERSE 1
36#define IP_VS_HDR_ICMP 2
37
38/* Generic access of ipvs struct */
39static inline struct netns_ipvs *net_ipvs(struct net* net)
40{
41 return net->ipvs;
42}
43
44/* This one needed for single_open_net since net is stored directly in
45 * private not as a struct i.e. seq_file_net can't be used.
46 */
47static inline struct net *seq_file_single_net(struct seq_file *seq)
48{
49#ifdef CONFIG_NET_NS
50 return (struct net *)seq->private;
51#else
52 return &init_net;
53#endif
54}
55
56/* Connections' size value needed by ip_vs_ctl.c */
57extern int ip_vs_conn_tab_size;
58
59struct ip_vs_iphdr {
60 int hdr_flags; /* ipvs flags */
61 __u32 off; /* Where IP or IPv4 header starts */
62 __u32 len; /* IPv4 simply where L4 starts
63 * IPv6 where L4 Transport Header starts */
64 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
65 __s16 protocol;
66 __s32 flags;
67 union nf_inet_addr saddr;
68 union nf_inet_addr daddr;
69};
70
71static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
72 int len, void *buffer)
73{
74 return skb_header_pointer(skb, offset, len, buffer);
75}
76
77/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
78 * IPv6 requires some extra work, as finding proper header position,
79 * depend on the IPv6 extension headers.
80 */
81static inline int
82ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
83 int hdr_flags, struct ip_vs_iphdr *iphdr)
84{
85 iphdr->hdr_flags = hdr_flags;
86 iphdr->off = offset;
87
88#ifdef CONFIG_IP_VS_IPV6
89 if (af == AF_INET6) {
90 struct ipv6hdr _iph;
91 const struct ipv6hdr *iph = skb_header_pointer(
92 skb, offset, sizeof(_iph), &_iph);
93 if (!iph)
94 return 0;
95
96 iphdr->saddr.in6 = iph->saddr;
97 iphdr->daddr.in6 = iph->daddr;
98 /* ipv6_find_hdr() updates len, flags */
99 iphdr->len = offset;
100 iphdr->flags = 0;
101 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
102 &iphdr->fragoffs,
103 &iphdr->flags);
104 if (iphdr->protocol < 0)
105 return 0;
106 } else
107#endif
108 {
109 struct iphdr _iph;
110 const struct iphdr *iph = skb_header_pointer(
111 skb, offset, sizeof(_iph), &_iph);
112 if (!iph)
113 return 0;
114
115 iphdr->len = offset + iph->ihl * 4;
116 iphdr->fragoffs = 0;
117 iphdr->protocol = iph->protocol;
118 iphdr->saddr.ip = iph->saddr;
119 iphdr->daddr.ip = iph->daddr;
120 }
121
122 return 1;
123}
124
125static inline int
126ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
127 bool inverse, struct ip_vs_iphdr *iphdr)
128{
129 int hdr_flags = IP_VS_HDR_ICMP;
130
131 if (inverse)
132 hdr_flags |= IP_VS_HDR_INVERSE;
133
134 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
135}
136
137static inline int
138ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
139 struct ip_vs_iphdr *iphdr)
140{
141 int hdr_flags = 0;
142
143 if (inverse)
144 hdr_flags |= IP_VS_HDR_INVERSE;
145
146 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
147 hdr_flags, iphdr);
148}
149
150static inline bool
151ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
152{
153 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
154}
155
156static inline bool
157ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
158{
159 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
160}
161
162static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
163 const union nf_inet_addr *src)
164{
165#ifdef CONFIG_IP_VS_IPV6
166 if (af == AF_INET6)
167 dst->in6 = src->in6;
168 else
169#endif
170 dst->ip = src->ip;
171}
172
173static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
174 const union nf_inet_addr *src)
175{
176#ifdef CONFIG_IP_VS_IPV6
177 if (af == AF_INET6) {
178 dst->in6 = src->in6;
179 return;
180 }
181#endif
182 dst->ip = src->ip;
183 dst->all[1] = 0;
184 dst->all[2] = 0;
185 dst->all[3] = 0;
186}
187
188static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
189 const union nf_inet_addr *b)
190{
191#ifdef CONFIG_IP_VS_IPV6
192 if (af == AF_INET6)
193 return ipv6_addr_equal(&a->in6, &b->in6);
194#endif
195 return a->ip == b->ip;
196}
197
198#ifdef CONFIG_IP_VS_DEBUG
199#include <linux/net.h>
200
201int ip_vs_get_debug_level(void);
202
203static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
204 const union nf_inet_addr *addr,
205 int *idx)
206{
207 int len;
208#ifdef CONFIG_IP_VS_IPV6
209 if (af == AF_INET6)
210 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
211 &addr->in6) + 1;
212 else
213#endif
214 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
215 &addr->ip) + 1;
216
217 *idx += len;
218 BUG_ON(*idx > buf_len + 1);
219 return &buf[*idx - len];
220}
221
222#define IP_VS_DBG_BUF(level, msg, ...) \
223 do { \
224 char ip_vs_dbg_buf[160]; \
225 int ip_vs_dbg_idx = 0; \
226 if (level <= ip_vs_get_debug_level()) \
227 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
228 } while (0)
229#define IP_VS_ERR_BUF(msg...) \
230 do { \
231 char ip_vs_dbg_buf[160]; \
232 int ip_vs_dbg_idx = 0; \
233 pr_err(msg); \
234 } while (0)
235
236/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
237#define IP_VS_DBG_ADDR(af, addr) \
238 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
239 sizeof(ip_vs_dbg_buf), addr, \
240 &ip_vs_dbg_idx)
241
242#define IP_VS_DBG(level, msg, ...) \
243 do { \
244 if (level <= ip_vs_get_debug_level()) \
245 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
246 } while (0)
247#define IP_VS_DBG_RL(msg, ...) \
248 do { \
249 if (net_ratelimit()) \
250 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
251 } while (0)
252#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
253 do { \
254 if (level <= ip_vs_get_debug_level()) \
255 pp->debug_packet(af, pp, skb, ofs, msg); \
256 } while (0)
257#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
258 do { \
259 if (level <= ip_vs_get_debug_level() && \
260 net_ratelimit()) \
261 pp->debug_packet(af, pp, skb, ofs, msg); \
262 } while (0)
263#else /* NO DEBUGGING at ALL */
264#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
265#define IP_VS_ERR_BUF(msg...) do {} while (0)
266#define IP_VS_DBG(level, msg...) do {} while (0)
267#define IP_VS_DBG_RL(msg...) do {} while (0)
268#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
269#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
270#endif
271
272#define IP_VS_BUG() BUG()
273#define IP_VS_ERR_RL(msg, ...) \
274 do { \
275 if (net_ratelimit()) \
276 pr_err(msg, ##__VA_ARGS__); \
277 } while (0)
278
279#ifdef CONFIG_IP_VS_DEBUG
280#define EnterFunction(level) \
281 do { \
282 if (level <= ip_vs_get_debug_level()) \
283 printk(KERN_DEBUG \
284 pr_fmt("Enter: %s, %s line %i\n"), \
285 __func__, __FILE__, __LINE__); \
286 } while (0)
287#define LeaveFunction(level) \
288 do { \
289 if (level <= ip_vs_get_debug_level()) \
290 printk(KERN_DEBUG \
291 pr_fmt("Leave: %s, %s line %i\n"), \
292 __func__, __FILE__, __LINE__); \
293 } while (0)
294#else
295#define EnterFunction(level) do {} while (0)
296#define LeaveFunction(level) do {} while (0)
297#endif
298
299/* The port number of FTP service (in network order). */
300#define FTPPORT cpu_to_be16(21)
301#define FTPDATA cpu_to_be16(20)
302
303/* TCP State Values */
304enum {
305 IP_VS_TCP_S_NONE = 0,
306 IP_VS_TCP_S_ESTABLISHED,
307 IP_VS_TCP_S_SYN_SENT,
308 IP_VS_TCP_S_SYN_RECV,
309 IP_VS_TCP_S_FIN_WAIT,
310 IP_VS_TCP_S_TIME_WAIT,
311 IP_VS_TCP_S_CLOSE,
312 IP_VS_TCP_S_CLOSE_WAIT,
313 IP_VS_TCP_S_LAST_ACK,
314 IP_VS_TCP_S_LISTEN,
315 IP_VS_TCP_S_SYNACK,
316 IP_VS_TCP_S_LAST
317};
318
319/* UDP State Values */
320enum {
321 IP_VS_UDP_S_NORMAL,
322 IP_VS_UDP_S_LAST,
323};
324
325/* ICMP State Values */
326enum {
327 IP_VS_ICMP_S_NORMAL,
328 IP_VS_ICMP_S_LAST,
329};
330
331/* SCTP State Values */
332enum ip_vs_sctp_states {
333 IP_VS_SCTP_S_NONE,
334 IP_VS_SCTP_S_INIT1,
335 IP_VS_SCTP_S_INIT,
336 IP_VS_SCTP_S_COOKIE_SENT,
337 IP_VS_SCTP_S_COOKIE_REPLIED,
338 IP_VS_SCTP_S_COOKIE_WAIT,
339 IP_VS_SCTP_S_COOKIE,
340 IP_VS_SCTP_S_COOKIE_ECHOED,
341 IP_VS_SCTP_S_ESTABLISHED,
342 IP_VS_SCTP_S_SHUTDOWN_SENT,
343 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
344 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
345 IP_VS_SCTP_S_REJECTED,
346 IP_VS_SCTP_S_CLOSED,
347 IP_VS_SCTP_S_LAST
348};
349
350/* Delta sequence info structure
351 * Each ip_vs_conn has 2 (output AND input seq. changes).
352 * Only used in the VS/NAT.
353 */
354struct ip_vs_seq {
355 __u32 init_seq; /* Add delta from this seq */
356 __u32 delta; /* Delta in sequence numbers */
357 __u32 previous_delta; /* Delta in sequence numbers
358 * before last resized pkt */
359};
360
361/* counters per cpu */
362struct ip_vs_counters {
363 __u64 conns; /* connections scheduled */
364 __u64 inpkts; /* incoming packets */
365 __u64 outpkts; /* outgoing packets */
366 __u64 inbytes; /* incoming bytes */
367 __u64 outbytes; /* outgoing bytes */
368};
369/* Stats per cpu */
370struct ip_vs_cpu_stats {
371 struct ip_vs_counters cnt;
372 struct u64_stats_sync syncp;
373};
374
375/* IPVS statistics objects */
376struct ip_vs_estimator {
377 struct list_head list;
378
379 u64 last_inbytes;
380 u64 last_outbytes;
381 u64 last_conns;
382 u64 last_inpkts;
383 u64 last_outpkts;
384
385 u64 cps;
386 u64 inpps;
387 u64 outpps;
388 u64 inbps;
389 u64 outbps;
390};
391
392/*
393 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
394 */
395struct ip_vs_kstats {
396 u64 conns; /* connections scheduled */
397 u64 inpkts; /* incoming packets */
398 u64 outpkts; /* outgoing packets */
399 u64 inbytes; /* incoming bytes */
400 u64 outbytes; /* outgoing bytes */
401
402 u64 cps; /* current connection rate */
403 u64 inpps; /* current in packet rate */
404 u64 outpps; /* current out packet rate */
405 u64 inbps; /* current in byte rate */
406 u64 outbps; /* current out byte rate */
407};
408
409struct ip_vs_stats {
410 struct ip_vs_kstats kstats; /* kernel statistics */
411 struct ip_vs_estimator est; /* estimator */
412 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
413 spinlock_t lock; /* spin lock */
414 struct ip_vs_kstats kstats0; /* reset values */
415};
416
417struct dst_entry;
418struct iphdr;
419struct ip_vs_conn;
420struct ip_vs_app;
421struct sk_buff;
422struct ip_vs_proto_data;
423
424struct ip_vs_protocol {
425 struct ip_vs_protocol *next;
426 char *name;
427 u16 protocol;
428 u16 num_states;
429 int dont_defrag;
430
431 void (*init)(struct ip_vs_protocol *pp);
432
433 void (*exit)(struct ip_vs_protocol *pp);
434
435 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
436
437 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
438
439 int (*conn_schedule)(struct netns_ipvs *ipvs,
440 int af, struct sk_buff *skb,
441 struct ip_vs_proto_data *pd,
442 int *verdict, struct ip_vs_conn **cpp,
443 struct ip_vs_iphdr *iph);
444
445 struct ip_vs_conn *
446 (*conn_in_get)(struct netns_ipvs *ipvs,
447 int af,
448 const struct sk_buff *skb,
449 const struct ip_vs_iphdr *iph);
450
451 struct ip_vs_conn *
452 (*conn_out_get)(struct netns_ipvs *ipvs,
453 int af,
454 const struct sk_buff *skb,
455 const struct ip_vs_iphdr *iph);
456
457 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
458 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
459
460 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
461 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
462
463 int (*csum_check)(int af, struct sk_buff *skb,
464 struct ip_vs_protocol *pp);
465
466 const char *(*state_name)(int state);
467
468 void (*state_transition)(struct ip_vs_conn *cp, int direction,
469 const struct sk_buff *skb,
470 struct ip_vs_proto_data *pd);
471
472 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
473
474 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
475
476 int (*app_conn_bind)(struct ip_vs_conn *cp);
477
478 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
479 const struct sk_buff *skb,
480 int offset,
481 const char *msg);
482
483 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
484};
485
486/* protocol data per netns */
487struct ip_vs_proto_data {
488 struct ip_vs_proto_data *next;
489 struct ip_vs_protocol *pp;
490 int *timeout_table; /* protocol timeout table */
491 atomic_t appcnt; /* counter of proto app incs. */
492 struct tcp_states_t *tcp_state_table;
493};
494
495struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
496struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
497 unsigned short proto);
498
499struct ip_vs_conn_param {
500 struct netns_ipvs *ipvs;
501 const union nf_inet_addr *caddr;
502 const union nf_inet_addr *vaddr;
503 __be16 cport;
504 __be16 vport;
505 __u16 protocol;
506 u16 af;
507
508 const struct ip_vs_pe *pe;
509 char *pe_data;
510 __u8 pe_data_len;
511};
512
513/* IP_VS structure allocated for each dynamically scheduled connection */
514struct ip_vs_conn {
515 struct hlist_node c_list; /* hashed list heads */
516 /* Protocol, addresses and port numbers */
517 __be16 cport;
518 __be16 dport;
519 __be16 vport;
520 u16 af; /* address family */
521 union nf_inet_addr caddr; /* client address */
522 union nf_inet_addr vaddr; /* virtual address */
523 union nf_inet_addr daddr; /* destination address */
524 volatile __u32 flags; /* status flags */
525 __u16 protocol; /* Which protocol (TCP/UDP) */
526 __u16 daf; /* Address family of the dest */
527 struct netns_ipvs *ipvs;
528
529 /* counter and timer */
530 refcount_t refcnt; /* reference count */
531 struct timer_list timer; /* Expiration timer */
532 volatile unsigned long timeout; /* timeout */
533
534 /* Flags and state transition */
535 spinlock_t lock; /* lock for state transition */
536 volatile __u16 state; /* state info */
537 volatile __u16 old_state; /* old state, to be used for
538 * state transition triggerd
539 * synchronization
540 */
541 __u32 fwmark; /* Fire wall mark from skb */
542 unsigned long sync_endtime; /* jiffies + sent_retries */
543
544 /* Control members */
545 struct ip_vs_conn *control; /* Master control connection */
546 atomic_t n_control; /* Number of controlled ones */
547 struct ip_vs_dest *dest; /* real server */
548 atomic_t in_pkts; /* incoming packet counter */
549
550 /* Packet transmitter for different forwarding methods. If it
551 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
552 * otherwise this must be changed to a sk_buff **.
553 * NF_ACCEPT can be returned when destination is local.
554 */
555 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
556 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
557
558 /* Note: we can group the following members into a structure,
559 * in order to save more space, and the following members are
560 * only used in VS/NAT anyway
561 */
562 struct ip_vs_app *app; /* bound ip_vs_app object */
563 void *app_data; /* Application private data */
564 struct ip_vs_seq in_seq; /* incoming seq. struct */
565 struct ip_vs_seq out_seq; /* outgoing seq. struct */
566
567 const struct ip_vs_pe *pe;
568 char *pe_data;
569 __u8 pe_data_len;
570
571 struct rcu_head rcu_head;
572};
573
574/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
575 * for IPv6 support.
576 *
577 * We need these to conveniently pass around service and destination
578 * options, but unfortunately, we also need to keep the old definitions to
579 * maintain userspace backwards compatibility for the setsockopt interface.
580 */
581struct ip_vs_service_user_kern {
582 /* virtual service addresses */
583 u16 af;
584 u16 protocol;
585 union nf_inet_addr addr; /* virtual ip address */
586 __be16 port;
587 u32 fwmark; /* firwall mark of service */
588
589 /* virtual service options */
590 char *sched_name;
591 char *pe_name;
592 unsigned int flags; /* virtual service flags */
593 unsigned int timeout; /* persistent timeout in sec */
594 __be32 netmask; /* persistent netmask or plen */
595};
596
597
598struct ip_vs_dest_user_kern {
599 /* destination server address */
600 union nf_inet_addr addr;
601 __be16 port;
602
603 /* real server options */
604 unsigned int conn_flags; /* connection flags */
605 int weight; /* destination weight */
606
607 /* thresholds for active connections */
608 u32 u_threshold; /* upper threshold */
609 u32 l_threshold; /* lower threshold */
610
611 /* Address family of addr */
612 u16 af;
613};
614
615
616/*
617 * The information about the virtual service offered to the net and the
618 * forwarding entries.
619 */
620struct ip_vs_service {
621 struct hlist_node s_list; /* for normal service table */
622 struct hlist_node f_list; /* for fwmark-based service table */
623 atomic_t refcnt; /* reference counter */
624
625 u16 af; /* address family */
626 __u16 protocol; /* which protocol (TCP/UDP) */
627 union nf_inet_addr addr; /* IP address for virtual service */
628 __be16 port; /* port number for the service */
629 __u32 fwmark; /* firewall mark of the service */
630 unsigned int flags; /* service status flags */
631 unsigned int timeout; /* persistent timeout in ticks */
632 __be32 netmask; /* grouping granularity, mask/plen */
633 struct netns_ipvs *ipvs;
634
635 struct list_head destinations; /* real server d-linked list */
636 __u32 num_dests; /* number of servers */
637 struct ip_vs_stats stats; /* statistics for the service */
638
639 /* for scheduling */
640 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
641 spinlock_t sched_lock; /* lock sched_data */
642 void *sched_data; /* scheduler application data */
643
644 /* alternate persistence engine */
645 struct ip_vs_pe __rcu *pe;
646
647 struct rcu_head rcu_head;
648};
649
650/* Information for cached dst */
651struct ip_vs_dest_dst {
652 struct dst_entry *dst_cache; /* destination cache entry */
653 u32 dst_cookie;
654 union nf_inet_addr dst_saddr;
655 struct rcu_head rcu_head;
656};
657
658/* The real server destination forwarding entry with ip address, port number,
659 * and so on.
660 */
661struct ip_vs_dest {
662 struct list_head n_list; /* for the dests in the service */
663 struct hlist_node d_list; /* for table with all the dests */
664
665 u16 af; /* address family */
666 __be16 port; /* port number of the server */
667 union nf_inet_addr addr; /* IP address of the server */
668 volatile unsigned int flags; /* dest status flags */
669 atomic_t conn_flags; /* flags to copy to conn */
670 atomic_t weight; /* server weight */
671
672 refcount_t refcnt; /* reference counter */
673 struct ip_vs_stats stats; /* statistics */
674 unsigned long idle_start; /* start time, jiffies */
675
676 /* connection counters and thresholds */
677 atomic_t activeconns; /* active connections */
678 atomic_t inactconns; /* inactive connections */
679 atomic_t persistconns; /* persistent connections */
680 __u32 u_threshold; /* upper threshold */
681 __u32 l_threshold; /* lower threshold */
682
683 /* for destination cache */
684 spinlock_t dst_lock; /* lock of dst_cache */
685 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
686
687 /* for virtual service */
688 struct ip_vs_service __rcu *svc; /* service it belongs to */
689 __u16 protocol; /* which protocol (TCP/UDP) */
690 __be16 vport; /* virtual port number */
691 union nf_inet_addr vaddr; /* virtual IP address */
692 __u32 vfwmark; /* firewall mark of service */
693
694 struct list_head t_list; /* in dest_trash */
695 unsigned int in_rs_table:1; /* we are in rs_table */
696};
697
698/* The scheduler object */
699struct ip_vs_scheduler {
700 struct list_head n_list; /* d-linked list head */
701 char *name; /* scheduler name */
702 atomic_t refcnt; /* reference counter */
703 struct module *module; /* THIS_MODULE/NULL */
704
705 /* scheduler initializing service */
706 int (*init_service)(struct ip_vs_service *svc);
707 /* scheduling service finish */
708 void (*done_service)(struct ip_vs_service *svc);
709 /* dest is linked */
710 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
711 /* dest is unlinked */
712 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
713 /* dest is updated */
714 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
715
716 /* selecting a server from the given service */
717 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
718 const struct sk_buff *skb,
719 struct ip_vs_iphdr *iph);
720};
721
722/* The persistence engine object */
723struct ip_vs_pe {
724 struct list_head n_list; /* d-linked list head */
725 char *name; /* scheduler name */
726 atomic_t refcnt; /* reference counter */
727 struct module *module; /* THIS_MODULE/NULL */
728
729 /* get the connection template, if any */
730 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
731 bool (*ct_match)(const struct ip_vs_conn_param *p,
732 struct ip_vs_conn *ct);
733 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
734 bool inverse);
735 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
736 /* create connections for real-server outgoing packets */
737 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
738 struct ip_vs_dest *dest,
739 struct sk_buff *skb,
740 const struct ip_vs_iphdr *iph,
741 __be16 dport, __be16 cport);
742};
743
744/* The application module object (a.k.a. app incarnation) */
745struct ip_vs_app {
746 struct list_head a_list; /* member in app list */
747 int type; /* IP_VS_APP_TYPE_xxx */
748 char *name; /* application module name */
749 __u16 protocol;
750 struct module *module; /* THIS_MODULE/NULL */
751 struct list_head incs_list; /* list of incarnations */
752
753 /* members for application incarnations */
754 struct list_head p_list; /* member in proto app list */
755 struct ip_vs_app *app; /* its real application */
756 __be16 port; /* port number in net order */
757 atomic_t usecnt; /* usage counter */
758 struct rcu_head rcu_head;
759
760 /* output hook: Process packet in inout direction, diff set for TCP.
761 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
762 * 2=Mangled but checksum was not updated
763 */
764 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
765 struct sk_buff *, int *diff);
766
767 /* input hook: Process packet in outin direction, diff set for TCP.
768 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
769 * 2=Mangled but checksum was not updated
770 */
771 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
772 struct sk_buff *, int *diff);
773
774 /* ip_vs_app initializer */
775 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
776
777 /* ip_vs_app finish */
778 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
779
780
781 /* not used now */
782 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
783 struct ip_vs_protocol *);
784
785 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
786
787 int * timeout_table;
788 int * timeouts;
789 int timeouts_size;
790
791 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
792 int *verdict, struct ip_vs_conn **cpp);
793
794 struct ip_vs_conn *
795 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
796 const struct iphdr *iph, int inverse);
797
798 struct ip_vs_conn *
799 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
800 const struct iphdr *iph, int inverse);
801
802 int (*state_transition)(struct ip_vs_conn *cp, int direction,
803 const struct sk_buff *skb,
804 struct ip_vs_app *app);
805
806 void (*timeout_change)(struct ip_vs_app *app, int flags);
807};
808
809struct ipvs_master_sync_state {
810 struct list_head sync_queue;
811 struct ip_vs_sync_buff *sync_buff;
812 unsigned long sync_queue_len;
813 unsigned int sync_queue_delay;
814 struct task_struct *master_thread;
815 struct delayed_work master_wakeup_work;
816 struct netns_ipvs *ipvs;
817};
818
819/* How much time to keep dests in trash */
820#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
821
822struct ipvs_sync_daemon_cfg {
823 union nf_inet_addr mcast_group;
824 int syncid;
825 u16 sync_maxlen;
826 u16 mcast_port;
827 u8 mcast_af;
828 u8 mcast_ttl;
829 /* multicast interface name */
830 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
831};
832
833/* IPVS in network namespace */
834struct netns_ipvs {
835 int gen; /* Generation */
836 int enable; /* enable like nf_hooks do */
837 /* Hash table: for real service lookups */
838 #define IP_VS_RTAB_BITS 4
839 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
840 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
841
842 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
843 /* ip_vs_app */
844 struct list_head app_list;
845 /* ip_vs_proto */
846 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
847 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
848 /* ip_vs_proto_tcp */
849#ifdef CONFIG_IP_VS_PROTO_TCP
850 #define TCP_APP_TAB_BITS 4
851 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
852 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
853 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
854#endif
855 /* ip_vs_proto_udp */
856#ifdef CONFIG_IP_VS_PROTO_UDP
857 #define UDP_APP_TAB_BITS 4
858 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
859 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
860 struct list_head udp_apps[UDP_APP_TAB_SIZE];
861#endif
862 /* ip_vs_proto_sctp */
863#ifdef CONFIG_IP_VS_PROTO_SCTP
864 #define SCTP_APP_TAB_BITS 4
865 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
866 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
867 /* Hash table for SCTP application incarnations */
868 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
869#endif
870 /* ip_vs_conn */
871 atomic_t conn_count; /* connection counter */
872
873 /* ip_vs_ctl */
874 struct ip_vs_stats tot_stats; /* Statistics & est. */
875
876 int num_services; /* no of virtual services */
877
878 /* Trash for destinations */
879 struct list_head dest_trash;
880 spinlock_t dest_trash_lock;
881 struct timer_list dest_trash_timer; /* expiration timer */
882 /* Service counters */
883 atomic_t ftpsvc_counter;
884 atomic_t nullsvc_counter;
885 atomic_t conn_out_counter;
886
887#ifdef CONFIG_SYSCTL
888 /* 1/rate drop and drop-entry variables */
889 struct delayed_work defense_work; /* Work handler */
890 int drop_rate;
891 int drop_counter;
892 atomic_t dropentry;
893 /* locks in ctl.c */
894 spinlock_t dropentry_lock; /* drop entry handling */
895 spinlock_t droppacket_lock; /* drop packet handling */
896 spinlock_t securetcp_lock; /* state and timeout tables */
897
898 /* sys-ctl struct */
899 struct ctl_table_header *sysctl_hdr;
900 struct ctl_table *sysctl_tbl;
901#endif
902
903 /* sysctl variables */
904 int sysctl_amemthresh;
905 int sysctl_am_droprate;
906 int sysctl_drop_entry;
907 int sysctl_drop_packet;
908 int sysctl_secure_tcp;
909#ifdef CONFIG_IP_VS_NFCT
910 int sysctl_conntrack;
911#endif
912 int sysctl_snat_reroute;
913 int sysctl_sync_ver;
914 int sysctl_sync_ports;
915 int sysctl_sync_persist_mode;
916 unsigned long sysctl_sync_qlen_max;
917 int sysctl_sync_sock_size;
918 int sysctl_cache_bypass;
919 int sysctl_expire_nodest_conn;
920 int sysctl_sloppy_tcp;
921 int sysctl_sloppy_sctp;
922 int sysctl_expire_quiescent_template;
923 int sysctl_sync_threshold[2];
924 unsigned int sysctl_sync_refresh_period;
925 int sysctl_sync_retries;
926 int sysctl_nat_icmp_send;
927 int sysctl_pmtu_disc;
928 int sysctl_backup_only;
929 int sysctl_conn_reuse_mode;
930 int sysctl_schedule_icmp;
931 int sysctl_ignore_tunneled;
932
933 /* ip_vs_lblc */
934 int sysctl_lblc_expiration;
935 struct ctl_table_header *lblc_ctl_header;
936 struct ctl_table *lblc_ctl_table;
937 /* ip_vs_lblcr */
938 int sysctl_lblcr_expiration;
939 struct ctl_table_header *lblcr_ctl_header;
940 struct ctl_table *lblcr_ctl_table;
941 /* ip_vs_est */
942 struct list_head est_list; /* estimator list */
943 spinlock_t est_lock;
944 struct timer_list est_timer; /* Estimation timer */
945 /* ip_vs_sync */
946 spinlock_t sync_lock;
947 struct ipvs_master_sync_state *ms;
948 spinlock_t sync_buff_lock;
949 struct task_struct **backup_threads;
950 int threads_mask;
951 volatile int sync_state;
952 struct mutex sync_mutex;
953 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
954 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
955 /* net name space ptr */
956 struct net *net; /* Needed by timer routines */
957 /* Number of heterogeneous destinations, needed becaus heterogeneous
958 * are not supported when synchronization is enabled.
959 */
960 unsigned int mixed_address_family_dests;
961};
962
963#define DEFAULT_SYNC_THRESHOLD 3
964#define DEFAULT_SYNC_PERIOD 50
965#define DEFAULT_SYNC_VER 1
966#define DEFAULT_SLOPPY_TCP 0
967#define DEFAULT_SLOPPY_SCTP 0
968#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
969#define DEFAULT_SYNC_RETRIES 0
970#define IPVS_SYNC_WAKEUP_RATE 8
971#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
972#define IPVS_SYNC_SEND_DELAY (HZ / 50)
973#define IPVS_SYNC_CHECK_PERIOD HZ
974#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
975#define IPVS_SYNC_PORTS_MAX (1 << 6)
976
977#ifdef CONFIG_SYSCTL
978
979static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
980{
981 return ipvs->sysctl_sync_threshold[0];
982}
983
984static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
985{
986 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
987}
988
989static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
990{
991 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
992}
993
994static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
995{
996 return ipvs->sysctl_sync_retries;
997}
998
999static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1000{
1001 return ipvs->sysctl_sync_ver;
1002}
1003
1004static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1005{
1006 return ipvs->sysctl_sloppy_tcp;
1007}
1008
1009static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1010{
1011 return ipvs->sysctl_sloppy_sctp;
1012}
1013
1014static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1015{
1016 return READ_ONCE(ipvs->sysctl_sync_ports);
1017}
1018
1019static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1020{
1021 return ipvs->sysctl_sync_persist_mode;
1022}
1023
1024static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1025{
1026 return ipvs->sysctl_sync_qlen_max;
1027}
1028
1029static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1030{
1031 return ipvs->sysctl_sync_sock_size;
1032}
1033
1034static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1035{
1036 return ipvs->sysctl_pmtu_disc;
1037}
1038
1039static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1040{
1041 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1042 ipvs->sysctl_backup_only;
1043}
1044
1045static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1046{
1047 return ipvs->sysctl_conn_reuse_mode;
1048}
1049
1050static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1051{
1052 return ipvs->sysctl_schedule_icmp;
1053}
1054
1055static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1056{
1057 return ipvs->sysctl_ignore_tunneled;
1058}
1059
1060static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1061{
1062 return ipvs->sysctl_cache_bypass;
1063}
1064
1065#else
1066
1067static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1068{
1069 return DEFAULT_SYNC_THRESHOLD;
1070}
1071
1072static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1073{
1074 return DEFAULT_SYNC_PERIOD;
1075}
1076
1077static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1078{
1079 return DEFAULT_SYNC_REFRESH_PERIOD;
1080}
1081
1082static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1083{
1084 return DEFAULT_SYNC_RETRIES & 3;
1085}
1086
1087static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1088{
1089 return DEFAULT_SYNC_VER;
1090}
1091
1092static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1093{
1094 return DEFAULT_SLOPPY_TCP;
1095}
1096
1097static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1098{
1099 return DEFAULT_SLOPPY_SCTP;
1100}
1101
1102static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1103{
1104 return 1;
1105}
1106
1107static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1108{
1109 return 0;
1110}
1111
1112static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1113{
1114 return IPVS_SYNC_QLEN_MAX;
1115}
1116
1117static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1118{
1119 return 0;
1120}
1121
1122static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1123{
1124 return 1;
1125}
1126
1127static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1128{
1129 return 0;
1130}
1131
1132static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1133{
1134 return 1;
1135}
1136
1137static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1138{
1139 return 0;
1140}
1141
1142static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1143{
1144 return 0;
1145}
1146
1147static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1148{
1149 return 0;
1150}
1151
1152#endif
1153
1154/* IPVS core functions
1155 * (from ip_vs_core.c)
1156 */
1157const char *ip_vs_proto_name(unsigned int proto);
1158void ip_vs_init_hash_table(struct list_head *table, int rows);
1159struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1160 struct ip_vs_dest *dest,
1161 struct sk_buff *skb,
1162 const struct ip_vs_iphdr *iph,
1163 __be16 dport,
1164 __be16 cport);
1165#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1166
1167#define IP_VS_APP_TYPE_FTP 1
1168
1169/* ip_vs_conn handling functions
1170 * (from ip_vs_conn.c)
1171 */
1172enum {
1173 IP_VS_DIR_INPUT = 0,
1174 IP_VS_DIR_OUTPUT,
1175 IP_VS_DIR_INPUT_ONLY,
1176 IP_VS_DIR_LAST,
1177};
1178
1179static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1180 const union nf_inet_addr *caddr,
1181 __be16 cport,
1182 const union nf_inet_addr *vaddr,
1183 __be16 vport,
1184 struct ip_vs_conn_param *p)
1185{
1186 p->ipvs = ipvs;
1187 p->af = af;
1188 p->protocol = protocol;
1189 p->caddr = caddr;
1190 p->cport = cport;
1191 p->vaddr = vaddr;
1192 p->vport = vport;
1193 p->pe = NULL;
1194 p->pe_data = NULL;
1195}
1196
1197struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1198struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1199
1200struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1201 const struct sk_buff *skb,
1202 const struct ip_vs_iphdr *iph);
1203
1204struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1205
1206struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1207 const struct sk_buff *skb,
1208 const struct ip_vs_iphdr *iph);
1209
1210/* Get reference to gain full access to conn.
1211 * By default, RCU read-side critical sections have access only to
1212 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1213 */
1214static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1215{
1216 return refcount_inc_not_zero(&cp->refcnt);
1217}
1218
1219/* put back the conn without restarting its timer */
1220static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1221{
1222 smp_mb__before_atomic();
1223 refcount_dec(&cp->refcnt);
1224}
1225void ip_vs_conn_put(struct ip_vs_conn *cp);
1226void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1227
1228struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1229 const union nf_inet_addr *daddr,
1230 __be16 dport, unsigned int flags,
1231 struct ip_vs_dest *dest, __u32 fwmark);
1232void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1233
1234const char *ip_vs_state_name(__u16 proto, int state);
1235
1236void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1237int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1238void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1239int ip_vs_conn_init(void);
1240void ip_vs_conn_cleanup(void);
1241
1242static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1243{
1244 struct ip_vs_conn *ctl_cp = cp->control;
1245 if (!ctl_cp) {
1246 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1247 "%s:%d to %s:%d\n",
1248 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1249 ntohs(cp->cport),
1250 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1251 ntohs(cp->vport));
1252
1253 return;
1254 }
1255
1256 IP_VS_DBG_BUF(7, "DELeting control for: "
1257 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1258 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1259 ntohs(cp->cport),
1260 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1261 ntohs(ctl_cp->cport));
1262
1263 cp->control = NULL;
1264 if (atomic_read(&ctl_cp->n_control) == 0) {
1265 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1266 "%s:%d to %s:%d\n",
1267 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1268 ntohs(cp->cport),
1269 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1270 ntohs(cp->vport));
1271
1272 return;
1273 }
1274 atomic_dec(&ctl_cp->n_control);
1275}
1276
1277static inline void
1278ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1279{
1280 if (cp->control) {
1281 IP_VS_ERR_BUF("request control ADD for already controlled: "
1282 "%s:%d to %s:%d\n",
1283 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1284 ntohs(cp->cport),
1285 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1286 ntohs(cp->vport));
1287
1288 ip_vs_control_del(cp);
1289 }
1290
1291 IP_VS_DBG_BUF(7, "ADDing control for: "
1292 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1293 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1294 ntohs(cp->cport),
1295 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1296 ntohs(ctl_cp->cport));
1297
1298 cp->control = ctl_cp;
1299 atomic_inc(&ctl_cp->n_control);
1300}
1301
1302/* IPVS netns init & cleanup functions */
1303int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1304int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1305int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1306int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1307int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1308int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1309void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1310void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1311void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1312void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1313void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1314void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1315void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1316
1317/* IPVS application functions
1318 * (from ip_vs_app.c)
1319 */
1320#define IP_VS_APP_MAX_PORTS 8
1321struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1322void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1323int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1324void ip_vs_unbind_app(struct ip_vs_conn *cp);
1325int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1326 __u16 port);
1327int ip_vs_app_inc_get(struct ip_vs_app *inc);
1328void ip_vs_app_inc_put(struct ip_vs_app *inc);
1329
1330int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1331int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1332
1333int register_ip_vs_pe(struct ip_vs_pe *pe);
1334int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1335struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1336struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1337
1338/* Use a #define to avoid all of module.h just for these trivial ops */
1339#define ip_vs_pe_get(pe) \
1340 if (pe && pe->module) \
1341 __module_get(pe->module);
1342
1343#define ip_vs_pe_put(pe) \
1344 if (pe && pe->module) \
1345 module_put(pe->module);
1346
1347/* IPVS protocol functions (from ip_vs_proto.c) */
1348int ip_vs_protocol_init(void);
1349void ip_vs_protocol_cleanup(void);
1350void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1351int *ip_vs_create_timeout_table(int *table, int size);
1352void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1353 const struct sk_buff *skb, int offset,
1354 const char *msg);
1355
1356extern struct ip_vs_protocol ip_vs_protocol_tcp;
1357extern struct ip_vs_protocol ip_vs_protocol_udp;
1358extern struct ip_vs_protocol ip_vs_protocol_icmp;
1359extern struct ip_vs_protocol ip_vs_protocol_esp;
1360extern struct ip_vs_protocol ip_vs_protocol_ah;
1361extern struct ip_vs_protocol ip_vs_protocol_sctp;
1362
1363/* Registering/unregistering scheduler functions
1364 * (from ip_vs_sched.c)
1365 */
1366int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1367int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1368int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1369 struct ip_vs_scheduler *scheduler);
1370void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1371 struct ip_vs_scheduler *sched);
1372struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1373void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1374struct ip_vs_conn *
1375ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1376 struct ip_vs_proto_data *pd, int *ignored,
1377 struct ip_vs_iphdr *iph);
1378int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1379 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1380
1381void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1382
1383/* IPVS control data and functions (from ip_vs_ctl.c) */
1384extern struct ip_vs_stats ip_vs_stats;
1385extern int sysctl_ip_vs_sync_ver;
1386
1387struct ip_vs_service *
1388ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1389 const union nf_inet_addr *vaddr, __be16 vport);
1390
1391bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1392 const union nf_inet_addr *daddr, __be16 dport);
1393
1394struct ip_vs_dest *
1395ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1396 const union nf_inet_addr *daddr, __be16 dport);
1397
1398int ip_vs_use_count_inc(void);
1399void ip_vs_use_count_dec(void);
1400int ip_vs_register_nl_ioctl(void);
1401void ip_vs_unregister_nl_ioctl(void);
1402int ip_vs_control_init(void);
1403void ip_vs_control_cleanup(void);
1404struct ip_vs_dest *
1405ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1406 const union nf_inet_addr *daddr, __be16 dport,
1407 const union nf_inet_addr *vaddr, __be16 vport,
1408 __u16 protocol, __u32 fwmark, __u32 flags);
1409void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1410
1411static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1412{
1413 refcount_inc(&dest->refcnt);
1414}
1415
1416static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1417{
1418 smp_mb__before_atomic();
1419 refcount_dec(&dest->refcnt);
1420}
1421
1422static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1423{
1424 if (refcount_dec_and_test(&dest->refcnt))
1425 kfree(dest);
1426}
1427
1428/* IPVS sync daemon data and function prototypes
1429 * (from ip_vs_sync.c)
1430 */
1431int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1432 int state);
1433int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1434void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1435
1436/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1437void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1438void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1439void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1440void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1441
1442/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1443int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1447int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1448 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1449int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1450 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1451int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1452 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1453int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1454 struct ip_vs_protocol *pp, int offset,
1455 unsigned int hooknum, struct ip_vs_iphdr *iph);
1456void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1457
1458#ifdef CONFIG_IP_VS_IPV6
1459int ip_vs_bypass_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_nat_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_tunnel_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_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1466 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1467int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1468 struct ip_vs_protocol *pp, int offset,
1469 unsigned int hooknum, struct ip_vs_iphdr *iph);
1470#endif
1471
1472#ifdef CONFIG_SYSCTL
1473/* This is a simple mechanism to ignore packets when
1474 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1475 * we start to drop 1/rate of the packets
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/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1491#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1492
1493static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1494{
1495 char fwd;
1496
1497 switch (IP_VS_FWD_METHOD(cp)) {
1498 case IP_VS_CONN_F_MASQ:
1499 fwd = 'M'; break;
1500 case IP_VS_CONN_F_LOCALNODE:
1501 fwd = 'L'; break;
1502 case IP_VS_CONN_F_TUNNEL:
1503 fwd = 'T'; break;
1504 case IP_VS_CONN_F_DROUTE:
1505 fwd = 'R'; break;
1506 case IP_VS_CONN_F_BYPASS:
1507 fwd = 'B'; break;
1508 default:
1509 fwd = '?'; break;
1510 }
1511 return fwd;
1512}
1513
1514void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1515 struct ip_vs_conn *cp, int dir);
1516
1517#ifdef CONFIG_IP_VS_IPV6
1518void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1519 struct ip_vs_conn *cp, int dir);
1520#endif
1521
1522__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1523
1524static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1525{
1526 __be32 diff[2] = { ~old, new };
1527
1528 return csum_partial(diff, sizeof(diff), oldsum);
1529}
1530
1531#ifdef CONFIG_IP_VS_IPV6
1532static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1533 __wsum oldsum)
1534{
1535 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1536 new[3], new[2], new[1], new[0] };
1537
1538 return csum_partial(diff, sizeof(diff), oldsum);
1539}
1540#endif
1541
1542static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1543{
1544 __be16 diff[2] = { ~old, new };
1545
1546 return csum_partial(diff, sizeof(diff), oldsum);
1547}
1548
1549/* Forget current conntrack (unconfirmed) and attach notrack entry */
1550static inline void ip_vs_notrack(struct sk_buff *skb)
1551{
1552#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1553 enum ip_conntrack_info ctinfo;
1554 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1555
1556 if (ct) {
1557 nf_conntrack_put(&ct->ct_general);
1558 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1559 }
1560#endif
1561}
1562
1563#ifdef CONFIG_IP_VS_NFCT
1564/* Netfilter connection tracking
1565 * (from ip_vs_nfct.c)
1566 */
1567static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1568{
1569#ifdef CONFIG_SYSCTL
1570 return ipvs->sysctl_conntrack;
1571#else
1572 return 0;
1573#endif
1574}
1575
1576void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1577 int outin);
1578int ip_vs_confirm_conntrack(struct sk_buff *skb);
1579void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1580 struct ip_vs_conn *cp, u_int8_t proto,
1581 const __be16 port, int from_rs);
1582void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1583
1584#else
1585
1586static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1587{
1588 return 0;
1589}
1590
1591static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1592 struct ip_vs_conn *cp, int outin)
1593{
1594}
1595
1596static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1597{
1598 return NF_ACCEPT;
1599}
1600
1601static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1602{
1603}
1604#endif /* CONFIG_IP_VS_NFCT */
1605
1606/* Really using conntrack? */
1607static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1608 struct sk_buff *skb)
1609{
1610#ifdef CONFIG_IP_VS_NFCT
1611 enum ip_conntrack_info ctinfo;
1612 struct nf_conn *ct;
1613
1614 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1615 return false;
1616 ct = nf_ct_get(skb, &ctinfo);
1617 if (ct)
1618 return true;
1619#endif
1620 return false;
1621}
1622
1623static inline int
1624ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1625{
1626 /* We think the overhead of processing active connections is 256
1627 * times higher than that of inactive connections in average. (This
1628 * 256 times might not be accurate, we will change it later) We
1629 * use the following formula to estimate the overhead now:
1630 * dest->activeconns*256 + dest->inactconns
1631 */
1632 return (atomic_read(&dest->activeconns) << 8) +
1633 atomic_read(&dest->inactconns);
1634}
1635
1636#endif /* _NET_IP_VS_H */