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1/* IP Virtual Server
2 * data structure and functionality definitions
3 */
4
5#ifndef _NET_IP_VS_H
6#define _NET_IP_VS_H
7
8#include <linux/ip_vs.h> /* definitions shared with userland */
9
10#include <asm/types.h> /* for __uXX types */
11
12#include <linux/list.h> /* for struct list_head */
13#include <linux/spinlock.h> /* for struct rwlock_t */
14#include <linux/atomic.h> /* for struct atomic_t */
15#include <linux/compiler.h>
16#include <linux/timer.h>
17#include <linux/bug.h>
18
19#include <net/checksum.h>
20#include <linux/netfilter.h> /* for union nf_inet_addr */
21#include <linux/ip.h>
22#include <linux/ipv6.h> /* for struct ipv6hdr */
23#include <net/ipv6.h>
24#if IS_ENABLED(CONFIG_IP_VS_IPV6)
25#include <linux/netfilter_ipv6/ip6_tables.h>
26#endif
27#if IS_ENABLED(CONFIG_NF_CONNTRACK)
28#include <net/netfilter/nf_conntrack.h>
29#endif
30#include <net/net_namespace.h> /* Netw namespace */
31
32#define IP_VS_HDR_INVERSE 1
33#define IP_VS_HDR_ICMP 2
34
35/* Generic access of ipvs struct */
36static inline struct netns_ipvs *net_ipvs(struct net* net)
37{
38 return net->ipvs;
39}
40
41/* This one needed for single_open_net since net is stored directly in
42 * private not as a struct i.e. seq_file_net can't be used.
43 */
44static inline struct net *seq_file_single_net(struct seq_file *seq)
45{
46#ifdef CONFIG_NET_NS
47 return (struct net *)seq->private;
48#else
49 return &init_net;
50#endif
51}
52
53/* Connections' size value needed by ip_vs_ctl.c */
54extern int ip_vs_conn_tab_size;
55
56struct ip_vs_iphdr {
57 int hdr_flags; /* ipvs flags */
58 __u32 off; /* Where IP or IPv4 header starts */
59 __u32 len; /* IPv4 simply where L4 starts
60 * IPv6 where L4 Transport Header starts */
61 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
62 __s16 protocol;
63 __s32 flags;
64 union nf_inet_addr saddr;
65 union nf_inet_addr daddr;
66};
67
68static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
69 int len, void *buffer,
70 const struct ip_vs_iphdr *ipvsh)
71{
72 return skb_header_pointer(skb, offset, len, buffer);
73}
74
75/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
76 * IPv6 requires some extra work, as finding proper header position,
77 * depend on the IPv6 extension headers.
78 */
79static inline int
80ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
81 int hdr_flags, struct ip_vs_iphdr *iphdr)
82{
83 iphdr->hdr_flags = hdr_flags;
84 iphdr->off = offset;
85
86#ifdef CONFIG_IP_VS_IPV6
87 if (af == AF_INET6) {
88 struct ipv6hdr _iph;
89 const struct ipv6hdr *iph = skb_header_pointer(
90 skb, offset, sizeof(_iph), &_iph);
91 if (!iph)
92 return 0;
93
94 iphdr->saddr.in6 = iph->saddr;
95 iphdr->daddr.in6 = iph->daddr;
96 /* ipv6_find_hdr() updates len, flags */
97 iphdr->len = offset;
98 iphdr->flags = 0;
99 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
100 &iphdr->fragoffs,
101 &iphdr->flags);
102 if (iphdr->protocol < 0)
103 return 0;
104 } else
105#endif
106 {
107 struct iphdr _iph;
108 const struct iphdr *iph = skb_header_pointer(
109 skb, offset, sizeof(_iph), &_iph);
110 if (!iph)
111 return 0;
112
113 iphdr->len = offset + iph->ihl * 4;
114 iphdr->fragoffs = 0;
115 iphdr->protocol = iph->protocol;
116 iphdr->saddr.ip = iph->saddr;
117 iphdr->daddr.ip = iph->daddr;
118 }
119
120 return 1;
121}
122
123static inline int
124ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
125 bool inverse, struct ip_vs_iphdr *iphdr)
126{
127 int hdr_flags = IP_VS_HDR_ICMP;
128
129 if (inverse)
130 hdr_flags |= IP_VS_HDR_INVERSE;
131
132 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
133}
134
135static inline int
136ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
137 struct ip_vs_iphdr *iphdr)
138{
139 int hdr_flags = 0;
140
141 if (inverse)
142 hdr_flags |= IP_VS_HDR_INVERSE;
143
144 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
145 hdr_flags, iphdr);
146}
147
148static inline bool
149ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
150{
151 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
152}
153
154static inline bool
155ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
156{
157 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
158}
159
160static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
161 const union nf_inet_addr *src)
162{
163#ifdef CONFIG_IP_VS_IPV6
164 if (af == AF_INET6)
165 dst->in6 = src->in6;
166 else
167#endif
168 dst->ip = src->ip;
169}
170
171static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
172 const union nf_inet_addr *src)
173{
174#ifdef CONFIG_IP_VS_IPV6
175 if (af == AF_INET6) {
176 dst->in6 = src->in6;
177 return;
178 }
179#endif
180 dst->ip = src->ip;
181 dst->all[1] = 0;
182 dst->all[2] = 0;
183 dst->all[3] = 0;
184}
185
186static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
187 const union nf_inet_addr *b)
188{
189#ifdef CONFIG_IP_VS_IPV6
190 if (af == AF_INET6)
191 return ipv6_addr_equal(&a->in6, &b->in6);
192#endif
193 return a->ip == b->ip;
194}
195
196#ifdef CONFIG_IP_VS_DEBUG
197#include <linux/net.h>
198
199int ip_vs_get_debug_level(void);
200
201static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
202 const union nf_inet_addr *addr,
203 int *idx)
204{
205 int len;
206#ifdef CONFIG_IP_VS_IPV6
207 if (af == AF_INET6)
208 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
209 &addr->in6) + 1;
210 else
211#endif
212 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
213 &addr->ip) + 1;
214
215 *idx += len;
216 BUG_ON(*idx > buf_len + 1);
217 return &buf[*idx - len];
218}
219
220#define IP_VS_DBG_BUF(level, msg, ...) \
221 do { \
222 char ip_vs_dbg_buf[160]; \
223 int ip_vs_dbg_idx = 0; \
224 if (level <= ip_vs_get_debug_level()) \
225 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
226 } while (0)
227#define IP_VS_ERR_BUF(msg...) \
228 do { \
229 char ip_vs_dbg_buf[160]; \
230 int ip_vs_dbg_idx = 0; \
231 pr_err(msg); \
232 } while (0)
233
234/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
235#define IP_VS_DBG_ADDR(af, addr) \
236 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
237 sizeof(ip_vs_dbg_buf), addr, \
238 &ip_vs_dbg_idx)
239
240#define IP_VS_DBG(level, msg, ...) \
241 do { \
242 if (level <= ip_vs_get_debug_level()) \
243 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
244 } while (0)
245#define IP_VS_DBG_RL(msg, ...) \
246 do { \
247 if (net_ratelimit()) \
248 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
249 } while (0)
250#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
251 do { \
252 if (level <= ip_vs_get_debug_level()) \
253 pp->debug_packet(af, pp, skb, ofs, msg); \
254 } while (0)
255#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
256 do { \
257 if (level <= ip_vs_get_debug_level() && \
258 net_ratelimit()) \
259 pp->debug_packet(af, pp, skb, ofs, msg); \
260 } while (0)
261#else /* NO DEBUGGING at ALL */
262#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
263#define IP_VS_ERR_BUF(msg...) do {} while (0)
264#define IP_VS_DBG(level, msg...) do {} while (0)
265#define IP_VS_DBG_RL(msg...) do {} while (0)
266#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
267#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
268#endif
269
270#define IP_VS_BUG() BUG()
271#define IP_VS_ERR_RL(msg, ...) \
272 do { \
273 if (net_ratelimit()) \
274 pr_err(msg, ##__VA_ARGS__); \
275 } while (0)
276
277#ifdef CONFIG_IP_VS_DEBUG
278#define EnterFunction(level) \
279 do { \
280 if (level <= ip_vs_get_debug_level()) \
281 printk(KERN_DEBUG \
282 pr_fmt("Enter: %s, %s line %i\n"), \
283 __func__, __FILE__, __LINE__); \
284 } while (0)
285#define LeaveFunction(level) \
286 do { \
287 if (level <= ip_vs_get_debug_level()) \
288 printk(KERN_DEBUG \
289 pr_fmt("Leave: %s, %s line %i\n"), \
290 __func__, __FILE__, __LINE__); \
291 } while (0)
292#else
293#define EnterFunction(level) do {} while (0)
294#define LeaveFunction(level) do {} while (0)
295#endif
296
297/* The port number of FTP service (in network order). */
298#define FTPPORT cpu_to_be16(21)
299#define FTPDATA cpu_to_be16(20)
300
301/* TCP State Values */
302enum {
303 IP_VS_TCP_S_NONE = 0,
304 IP_VS_TCP_S_ESTABLISHED,
305 IP_VS_TCP_S_SYN_SENT,
306 IP_VS_TCP_S_SYN_RECV,
307 IP_VS_TCP_S_FIN_WAIT,
308 IP_VS_TCP_S_TIME_WAIT,
309 IP_VS_TCP_S_CLOSE,
310 IP_VS_TCP_S_CLOSE_WAIT,
311 IP_VS_TCP_S_LAST_ACK,
312 IP_VS_TCP_S_LISTEN,
313 IP_VS_TCP_S_SYNACK,
314 IP_VS_TCP_S_LAST
315};
316
317/* UDP State Values */
318enum {
319 IP_VS_UDP_S_NORMAL,
320 IP_VS_UDP_S_LAST,
321};
322
323/* ICMP State Values */
324enum {
325 IP_VS_ICMP_S_NORMAL,
326 IP_VS_ICMP_S_LAST,
327};
328
329/* SCTP State Values */
330enum ip_vs_sctp_states {
331 IP_VS_SCTP_S_NONE,
332 IP_VS_SCTP_S_INIT1,
333 IP_VS_SCTP_S_INIT,
334 IP_VS_SCTP_S_COOKIE_SENT,
335 IP_VS_SCTP_S_COOKIE_REPLIED,
336 IP_VS_SCTP_S_COOKIE_WAIT,
337 IP_VS_SCTP_S_COOKIE,
338 IP_VS_SCTP_S_COOKIE_ECHOED,
339 IP_VS_SCTP_S_ESTABLISHED,
340 IP_VS_SCTP_S_SHUTDOWN_SENT,
341 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
342 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
343 IP_VS_SCTP_S_REJECTED,
344 IP_VS_SCTP_S_CLOSED,
345 IP_VS_SCTP_S_LAST
346};
347
348/* Delta sequence info structure
349 * Each ip_vs_conn has 2 (output AND input seq. changes).
350 * Only used in the VS/NAT.
351 */
352struct ip_vs_seq {
353 __u32 init_seq; /* Add delta from this seq */
354 __u32 delta; /* Delta in sequence numbers */
355 __u32 previous_delta; /* Delta in sequence numbers
356 * before last resized pkt */
357};
358
359/* counters per cpu */
360struct ip_vs_counters {
361 __u64 conns; /* connections scheduled */
362 __u64 inpkts; /* incoming packets */
363 __u64 outpkts; /* outgoing packets */
364 __u64 inbytes; /* incoming bytes */
365 __u64 outbytes; /* outgoing bytes */
366};
367/* Stats per cpu */
368struct ip_vs_cpu_stats {
369 struct ip_vs_counters cnt;
370 struct u64_stats_sync syncp;
371};
372
373/* IPVS statistics objects */
374struct ip_vs_estimator {
375 struct list_head list;
376
377 u64 last_inbytes;
378 u64 last_outbytes;
379 u64 last_conns;
380 u64 last_inpkts;
381 u64 last_outpkts;
382
383 u64 cps;
384 u64 inpps;
385 u64 outpps;
386 u64 inbps;
387 u64 outbps;
388};
389
390/*
391 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
392 */
393struct ip_vs_kstats {
394 u64 conns; /* connections scheduled */
395 u64 inpkts; /* incoming packets */
396 u64 outpkts; /* outgoing packets */
397 u64 inbytes; /* incoming bytes */
398 u64 outbytes; /* outgoing bytes */
399
400 u64 cps; /* current connection rate */
401 u64 inpps; /* current in packet rate */
402 u64 outpps; /* current out packet rate */
403 u64 inbps; /* current in byte rate */
404 u64 outbps; /* current out byte rate */
405};
406
407struct ip_vs_stats {
408 struct ip_vs_kstats kstats; /* kernel statistics */
409 struct ip_vs_estimator est; /* estimator */
410 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
411 spinlock_t lock; /* spin lock */
412 struct ip_vs_kstats kstats0; /* reset values */
413};
414
415struct dst_entry;
416struct iphdr;
417struct ip_vs_conn;
418struct ip_vs_app;
419struct sk_buff;
420struct ip_vs_proto_data;
421
422struct ip_vs_protocol {
423 struct ip_vs_protocol *next;
424 char *name;
425 u16 protocol;
426 u16 num_states;
427 int dont_defrag;
428
429 void (*init)(struct ip_vs_protocol *pp);
430
431 void (*exit)(struct ip_vs_protocol *pp);
432
433 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
434
435 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
436
437 int (*conn_schedule)(struct netns_ipvs *ipvs,
438 int af, struct sk_buff *skb,
439 struct ip_vs_proto_data *pd,
440 int *verdict, struct ip_vs_conn **cpp,
441 struct ip_vs_iphdr *iph);
442
443 struct ip_vs_conn *
444 (*conn_in_get)(struct netns_ipvs *ipvs,
445 int af,
446 const struct sk_buff *skb,
447 const struct ip_vs_iphdr *iph);
448
449 struct ip_vs_conn *
450 (*conn_out_get)(struct netns_ipvs *ipvs,
451 int af,
452 const struct sk_buff *skb,
453 const struct ip_vs_iphdr *iph);
454
455 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
456 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
457
458 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
459 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
460
461 int (*csum_check)(int af, struct sk_buff *skb,
462 struct ip_vs_protocol *pp);
463
464 const char *(*state_name)(int state);
465
466 void (*state_transition)(struct ip_vs_conn *cp, int direction,
467 const struct sk_buff *skb,
468 struct ip_vs_proto_data *pd);
469
470 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
471
472 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
473
474 int (*app_conn_bind)(struct ip_vs_conn *cp);
475
476 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
477 const struct sk_buff *skb,
478 int offset,
479 const char *msg);
480
481 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
482};
483
484/* protocol data per netns */
485struct ip_vs_proto_data {
486 struct ip_vs_proto_data *next;
487 struct ip_vs_protocol *pp;
488 int *timeout_table; /* protocol timeout table */
489 atomic_t appcnt; /* counter of proto app incs. */
490 struct tcp_states_t *tcp_state_table;
491};
492
493struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
494struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
495 unsigned short proto);
496
497struct ip_vs_conn_param {
498 struct netns_ipvs *ipvs;
499 const union nf_inet_addr *caddr;
500 const union nf_inet_addr *vaddr;
501 __be16 cport;
502 __be16 vport;
503 __u16 protocol;
504 u16 af;
505
506 const struct ip_vs_pe *pe;
507 char *pe_data;
508 __u8 pe_data_len;
509};
510
511/* IP_VS structure allocated for each dynamically scheduled connection */
512struct ip_vs_conn {
513 struct hlist_node c_list; /* hashed list heads */
514 /* Protocol, addresses and port numbers */
515 __be16 cport;
516 __be16 dport;
517 __be16 vport;
518 u16 af; /* address family */
519 union nf_inet_addr caddr; /* client address */
520 union nf_inet_addr vaddr; /* virtual address */
521 union nf_inet_addr daddr; /* destination address */
522 volatile __u32 flags; /* status flags */
523 __u16 protocol; /* Which protocol (TCP/UDP) */
524 __u16 daf; /* Address family of the dest */
525 struct netns_ipvs *ipvs;
526
527 /* counter and timer */
528 atomic_t refcnt; /* reference count */
529 struct timer_list timer; /* Expiration timer */
530 volatile unsigned long timeout; /* timeout */
531
532 /* Flags and state transition */
533 spinlock_t lock; /* lock for state transition */
534 volatile __u16 state; /* state info */
535 volatile __u16 old_state; /* old state, to be used for
536 * state transition triggerd
537 * synchronization
538 */
539 __u32 fwmark; /* Fire wall mark from skb */
540 unsigned long sync_endtime; /* jiffies + sent_retries */
541
542 /* Control members */
543 struct ip_vs_conn *control; /* Master control connection */
544 atomic_t n_control; /* Number of controlled ones */
545 struct ip_vs_dest *dest; /* real server */
546 atomic_t in_pkts; /* incoming packet counter */
547
548 /* Packet transmitter for different forwarding methods. If it
549 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
550 * otherwise this must be changed to a sk_buff **.
551 * NF_ACCEPT can be returned when destination is local.
552 */
553 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
554 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
555
556 /* Note: we can group the following members into a structure,
557 * in order to save more space, and the following members are
558 * only used in VS/NAT anyway
559 */
560 struct ip_vs_app *app; /* bound ip_vs_app object */
561 void *app_data; /* Application private data */
562 struct ip_vs_seq in_seq; /* incoming seq. struct */
563 struct ip_vs_seq out_seq; /* outgoing seq. struct */
564
565 const struct ip_vs_pe *pe;
566 char *pe_data;
567 __u8 pe_data_len;
568
569 struct rcu_head rcu_head;
570};
571
572/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
573 * for IPv6 support.
574 *
575 * We need these to conveniently pass around service and destination
576 * options, but unfortunately, we also need to keep the old definitions to
577 * maintain userspace backwards compatibility for the setsockopt interface.
578 */
579struct ip_vs_service_user_kern {
580 /* virtual service addresses */
581 u16 af;
582 u16 protocol;
583 union nf_inet_addr addr; /* virtual ip address */
584 __be16 port;
585 u32 fwmark; /* firwall mark of service */
586
587 /* virtual service options */
588 char *sched_name;
589 char *pe_name;
590 unsigned int flags; /* virtual service flags */
591 unsigned int timeout; /* persistent timeout in sec */
592 __be32 netmask; /* persistent netmask or plen */
593};
594
595
596struct ip_vs_dest_user_kern {
597 /* destination server address */
598 union nf_inet_addr addr;
599 __be16 port;
600
601 /* real server options */
602 unsigned int conn_flags; /* connection flags */
603 int weight; /* destination weight */
604
605 /* thresholds for active connections */
606 u32 u_threshold; /* upper threshold */
607 u32 l_threshold; /* lower threshold */
608
609 /* Address family of addr */
610 u16 af;
611};
612
613
614/*
615 * The information about the virtual service offered to the net and the
616 * forwarding entries.
617 */
618struct ip_vs_service {
619 struct hlist_node s_list; /* for normal service table */
620 struct hlist_node f_list; /* for fwmark-based service table */
621 atomic_t refcnt; /* reference counter */
622
623 u16 af; /* address family */
624 __u16 protocol; /* which protocol (TCP/UDP) */
625 union nf_inet_addr addr; /* IP address for virtual service */
626 __be16 port; /* port number for the service */
627 __u32 fwmark; /* firewall mark of the service */
628 unsigned int flags; /* service status flags */
629 unsigned int timeout; /* persistent timeout in ticks */
630 __be32 netmask; /* grouping granularity, mask/plen */
631 struct netns_ipvs *ipvs;
632
633 struct list_head destinations; /* real server d-linked list */
634 __u32 num_dests; /* number of servers */
635 struct ip_vs_stats stats; /* statistics for the service */
636
637 /* for scheduling */
638 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
639 spinlock_t sched_lock; /* lock sched_data */
640 void *sched_data; /* scheduler application data */
641
642 /* alternate persistence engine */
643 struct ip_vs_pe __rcu *pe;
644
645 struct rcu_head rcu_head;
646};
647
648/* Information for cached dst */
649struct ip_vs_dest_dst {
650 struct dst_entry *dst_cache; /* destination cache entry */
651 u32 dst_cookie;
652 union nf_inet_addr dst_saddr;
653 struct rcu_head rcu_head;
654};
655
656/* The real server destination forwarding entry with ip address, port number,
657 * and so on.
658 */
659struct ip_vs_dest {
660 struct list_head n_list; /* for the dests in the service */
661 struct hlist_node d_list; /* for table with all the dests */
662
663 u16 af; /* address family */
664 __be16 port; /* port number of the server */
665 union nf_inet_addr addr; /* IP address of the server */
666 volatile unsigned int flags; /* dest status flags */
667 atomic_t conn_flags; /* flags to copy to conn */
668 atomic_t weight; /* server weight */
669
670 atomic_t refcnt; /* reference counter */
671 struct ip_vs_stats stats; /* statistics */
672 unsigned long idle_start; /* start time, jiffies */
673
674 /* connection counters and thresholds */
675 atomic_t activeconns; /* active connections */
676 atomic_t inactconns; /* inactive connections */
677 atomic_t persistconns; /* persistent connections */
678 __u32 u_threshold; /* upper threshold */
679 __u32 l_threshold; /* lower threshold */
680
681 /* for destination cache */
682 spinlock_t dst_lock; /* lock of dst_cache */
683 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
684
685 /* for virtual service */
686 struct ip_vs_service __rcu *svc; /* service it belongs to */
687 __u16 protocol; /* which protocol (TCP/UDP) */
688 __be16 vport; /* virtual port number */
689 union nf_inet_addr vaddr; /* virtual IP address */
690 __u32 vfwmark; /* firewall mark of service */
691
692 struct list_head t_list; /* in dest_trash */
693 unsigned int in_rs_table:1; /* we are in rs_table */
694};
695
696/* The scheduler object */
697struct ip_vs_scheduler {
698 struct list_head n_list; /* d-linked list head */
699 char *name; /* scheduler name */
700 atomic_t refcnt; /* reference counter */
701 struct module *module; /* THIS_MODULE/NULL */
702
703 /* scheduler initializing service */
704 int (*init_service)(struct ip_vs_service *svc);
705 /* scheduling service finish */
706 void (*done_service)(struct ip_vs_service *svc);
707 /* dest is linked */
708 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
709 /* dest is unlinked */
710 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
711 /* dest is updated */
712 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
713
714 /* selecting a server from the given service */
715 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
716 const struct sk_buff *skb,
717 struct ip_vs_iphdr *iph);
718};
719
720/* The persistence engine object */
721struct ip_vs_pe {
722 struct list_head n_list; /* d-linked list head */
723 char *name; /* scheduler name */
724 atomic_t refcnt; /* reference counter */
725 struct module *module; /* THIS_MODULE/NULL */
726
727 /* get the connection template, if any */
728 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
729 bool (*ct_match)(const struct ip_vs_conn_param *p,
730 struct ip_vs_conn *ct);
731 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
732 bool inverse);
733 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
734};
735
736/* The application module object (a.k.a. app incarnation) */
737struct ip_vs_app {
738 struct list_head a_list; /* member in app list */
739 int type; /* IP_VS_APP_TYPE_xxx */
740 char *name; /* application module name */
741 __u16 protocol;
742 struct module *module; /* THIS_MODULE/NULL */
743 struct list_head incs_list; /* list of incarnations */
744
745 /* members for application incarnations */
746 struct list_head p_list; /* member in proto app list */
747 struct ip_vs_app *app; /* its real application */
748 __be16 port; /* port number in net order */
749 atomic_t usecnt; /* usage counter */
750 struct rcu_head rcu_head;
751
752 /* output hook: Process packet in inout direction, diff set for TCP.
753 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
754 * 2=Mangled but checksum was not updated
755 */
756 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
757 struct sk_buff *, int *diff);
758
759 /* input hook: Process packet in outin direction, diff set for TCP.
760 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
761 * 2=Mangled but checksum was not updated
762 */
763 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
764 struct sk_buff *, int *diff);
765
766 /* ip_vs_app initializer */
767 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
768
769 /* ip_vs_app finish */
770 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
771
772
773 /* not used now */
774 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
775 struct ip_vs_protocol *);
776
777 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
778
779 int * timeout_table;
780 int * timeouts;
781 int timeouts_size;
782
783 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
784 int *verdict, struct ip_vs_conn **cpp);
785
786 struct ip_vs_conn *
787 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
788 const struct iphdr *iph, int inverse);
789
790 struct ip_vs_conn *
791 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
792 const struct iphdr *iph, int inverse);
793
794 int (*state_transition)(struct ip_vs_conn *cp, int direction,
795 const struct sk_buff *skb,
796 struct ip_vs_app *app);
797
798 void (*timeout_change)(struct ip_vs_app *app, int flags);
799};
800
801struct ipvs_master_sync_state {
802 struct list_head sync_queue;
803 struct ip_vs_sync_buff *sync_buff;
804 unsigned long sync_queue_len;
805 unsigned int sync_queue_delay;
806 struct task_struct *master_thread;
807 struct delayed_work master_wakeup_work;
808 struct netns_ipvs *ipvs;
809};
810
811/* How much time to keep dests in trash */
812#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
813
814struct ipvs_sync_daemon_cfg {
815 union nf_inet_addr mcast_group;
816 int syncid;
817 u16 sync_maxlen;
818 u16 mcast_port;
819 u8 mcast_af;
820 u8 mcast_ttl;
821 /* multicast interface name */
822 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
823};
824
825/* IPVS in network namespace */
826struct netns_ipvs {
827 int gen; /* Generation */
828 int enable; /* enable like nf_hooks do */
829 /* Hash table: for real service lookups */
830 #define IP_VS_RTAB_BITS 4
831 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
832 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
833
834 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
835 /* ip_vs_app */
836 struct list_head app_list;
837 /* ip_vs_proto */
838 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
839 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
840 /* ip_vs_proto_tcp */
841#ifdef CONFIG_IP_VS_PROTO_TCP
842 #define TCP_APP_TAB_BITS 4
843 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
844 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
845 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
846#endif
847 /* ip_vs_proto_udp */
848#ifdef CONFIG_IP_VS_PROTO_UDP
849 #define UDP_APP_TAB_BITS 4
850 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
851 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
852 struct list_head udp_apps[UDP_APP_TAB_SIZE];
853#endif
854 /* ip_vs_proto_sctp */
855#ifdef CONFIG_IP_VS_PROTO_SCTP
856 #define SCTP_APP_TAB_BITS 4
857 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
858 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
859 /* Hash table for SCTP application incarnations */
860 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
861#endif
862 /* ip_vs_conn */
863 atomic_t conn_count; /* connection counter */
864
865 /* ip_vs_ctl */
866 struct ip_vs_stats tot_stats; /* Statistics & est. */
867
868 int num_services; /* no of virtual services */
869
870 /* Trash for destinations */
871 struct list_head dest_trash;
872 spinlock_t dest_trash_lock;
873 struct timer_list dest_trash_timer; /* expiration timer */
874 /* Service counters */
875 atomic_t ftpsvc_counter;
876 atomic_t nullsvc_counter;
877
878#ifdef CONFIG_SYSCTL
879 /* 1/rate drop and drop-entry variables */
880 struct delayed_work defense_work; /* Work handler */
881 int drop_rate;
882 int drop_counter;
883 atomic_t dropentry;
884 /* locks in ctl.c */
885 spinlock_t dropentry_lock; /* drop entry handling */
886 spinlock_t droppacket_lock; /* drop packet handling */
887 spinlock_t securetcp_lock; /* state and timeout tables */
888
889 /* sys-ctl struct */
890 struct ctl_table_header *sysctl_hdr;
891 struct ctl_table *sysctl_tbl;
892#endif
893
894 /* sysctl variables */
895 int sysctl_amemthresh;
896 int sysctl_am_droprate;
897 int sysctl_drop_entry;
898 int sysctl_drop_packet;
899 int sysctl_secure_tcp;
900#ifdef CONFIG_IP_VS_NFCT
901 int sysctl_conntrack;
902#endif
903 int sysctl_snat_reroute;
904 int sysctl_sync_ver;
905 int sysctl_sync_ports;
906 int sysctl_sync_persist_mode;
907 unsigned long sysctl_sync_qlen_max;
908 int sysctl_sync_sock_size;
909 int sysctl_cache_bypass;
910 int sysctl_expire_nodest_conn;
911 int sysctl_sloppy_tcp;
912 int sysctl_sloppy_sctp;
913 int sysctl_expire_quiescent_template;
914 int sysctl_sync_threshold[2];
915 unsigned int sysctl_sync_refresh_period;
916 int sysctl_sync_retries;
917 int sysctl_nat_icmp_send;
918 int sysctl_pmtu_disc;
919 int sysctl_backup_only;
920 int sysctl_conn_reuse_mode;
921 int sysctl_schedule_icmp;
922 int sysctl_ignore_tunneled;
923
924 /* ip_vs_lblc */
925 int sysctl_lblc_expiration;
926 struct ctl_table_header *lblc_ctl_header;
927 struct ctl_table *lblc_ctl_table;
928 /* ip_vs_lblcr */
929 int sysctl_lblcr_expiration;
930 struct ctl_table_header *lblcr_ctl_header;
931 struct ctl_table *lblcr_ctl_table;
932 /* ip_vs_est */
933 struct list_head est_list; /* estimator list */
934 spinlock_t est_lock;
935 struct timer_list est_timer; /* Estimation timer */
936 /* ip_vs_sync */
937 spinlock_t sync_lock;
938 struct ipvs_master_sync_state *ms;
939 spinlock_t sync_buff_lock;
940 struct task_struct **backup_threads;
941 int threads_mask;
942 volatile int sync_state;
943 struct mutex sync_mutex;
944 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
945 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
946 /* net name space ptr */
947 struct net *net; /* Needed by timer routines */
948 /* Number of heterogeneous destinations, needed becaus heterogeneous
949 * are not supported when synchronization is enabled.
950 */
951 unsigned int mixed_address_family_dests;
952};
953
954#define DEFAULT_SYNC_THRESHOLD 3
955#define DEFAULT_SYNC_PERIOD 50
956#define DEFAULT_SYNC_VER 1
957#define DEFAULT_SLOPPY_TCP 0
958#define DEFAULT_SLOPPY_SCTP 0
959#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
960#define DEFAULT_SYNC_RETRIES 0
961#define IPVS_SYNC_WAKEUP_RATE 8
962#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
963#define IPVS_SYNC_SEND_DELAY (HZ / 50)
964#define IPVS_SYNC_CHECK_PERIOD HZ
965#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
966#define IPVS_SYNC_PORTS_MAX (1 << 6)
967
968#ifdef CONFIG_SYSCTL
969
970static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
971{
972 return ipvs->sysctl_sync_threshold[0];
973}
974
975static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
976{
977 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
978}
979
980static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
981{
982 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
983}
984
985static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
986{
987 return ipvs->sysctl_sync_retries;
988}
989
990static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
991{
992 return ipvs->sysctl_sync_ver;
993}
994
995static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
996{
997 return ipvs->sysctl_sloppy_tcp;
998}
999
1000static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1001{
1002 return ipvs->sysctl_sloppy_sctp;
1003}
1004
1005static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1006{
1007 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1008}
1009
1010static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1011{
1012 return ipvs->sysctl_sync_persist_mode;
1013}
1014
1015static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1016{
1017 return ipvs->sysctl_sync_qlen_max;
1018}
1019
1020static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1021{
1022 return ipvs->sysctl_sync_sock_size;
1023}
1024
1025static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1026{
1027 return ipvs->sysctl_pmtu_disc;
1028}
1029
1030static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1031{
1032 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1033 ipvs->sysctl_backup_only;
1034}
1035
1036static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1037{
1038 return ipvs->sysctl_conn_reuse_mode;
1039}
1040
1041static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1042{
1043 return ipvs->sysctl_schedule_icmp;
1044}
1045
1046static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1047{
1048 return ipvs->sysctl_ignore_tunneled;
1049}
1050
1051static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1052{
1053 return ipvs->sysctl_cache_bypass;
1054}
1055
1056#else
1057
1058static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1059{
1060 return DEFAULT_SYNC_THRESHOLD;
1061}
1062
1063static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1064{
1065 return DEFAULT_SYNC_PERIOD;
1066}
1067
1068static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1069{
1070 return DEFAULT_SYNC_REFRESH_PERIOD;
1071}
1072
1073static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1074{
1075 return DEFAULT_SYNC_RETRIES & 3;
1076}
1077
1078static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1079{
1080 return DEFAULT_SYNC_VER;
1081}
1082
1083static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1084{
1085 return DEFAULT_SLOPPY_TCP;
1086}
1087
1088static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1089{
1090 return DEFAULT_SLOPPY_SCTP;
1091}
1092
1093static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1094{
1095 return 1;
1096}
1097
1098static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1099{
1100 return 0;
1101}
1102
1103static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1104{
1105 return IPVS_SYNC_QLEN_MAX;
1106}
1107
1108static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1109{
1110 return 0;
1111}
1112
1113static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1114{
1115 return 1;
1116}
1117
1118static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1119{
1120 return 0;
1121}
1122
1123static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1124{
1125 return 1;
1126}
1127
1128static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1129{
1130 return 0;
1131}
1132
1133static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1134{
1135 return 0;
1136}
1137
1138static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1139{
1140 return 0;
1141}
1142
1143#endif
1144
1145/* IPVS core functions
1146 * (from ip_vs_core.c)
1147 */
1148const char *ip_vs_proto_name(unsigned int proto);
1149void ip_vs_init_hash_table(struct list_head *table, int rows);
1150#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1151
1152#define IP_VS_APP_TYPE_FTP 1
1153
1154/* ip_vs_conn handling functions
1155 * (from ip_vs_conn.c)
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 netns_ipvs *ipvs, 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->ipvs = ipvs;
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(struct netns_ipvs *ipvs, int af,
1186 const struct sk_buff *skb,
1187 const struct ip_vs_iphdr *iph);
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(struct netns_ipvs *ipvs, int af,
1192 const struct sk_buff *skb,
1193 const struct ip_vs_iphdr *iph);
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();
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, int dest_af,
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 ip_vs_conn *cp);
1222int ip_vs_check_template(struct ip_vs_conn *ct);
1223void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
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/* IPVS netns init & cleanup functions */
1288int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1289int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1290int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1291int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1292int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1293int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1294void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1295void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1296void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1297void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1298void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1299void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1300void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1301
1302/* IPVS application functions
1303 * (from ip_vs_app.c)
1304 */
1305#define IP_VS_APP_MAX_PORTS 8
1306struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1307void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1308int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1309void ip_vs_unbind_app(struct ip_vs_conn *cp);
1310int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1311 __u16 port);
1312int ip_vs_app_inc_get(struct ip_vs_app *inc);
1313void ip_vs_app_inc_put(struct ip_vs_app *inc);
1314
1315int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1316int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1317
1318int register_ip_vs_pe(struct ip_vs_pe *pe);
1319int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1320struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1321struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1322
1323/* Use a #define to avoid all of module.h just for these trivial ops */
1324#define ip_vs_pe_get(pe) \
1325 if (pe && pe->module) \
1326 __module_get(pe->module);
1327
1328#define ip_vs_pe_put(pe) \
1329 if (pe && pe->module) \
1330 module_put(pe->module);
1331
1332/* IPVS protocol functions (from ip_vs_proto.c) */
1333int ip_vs_protocol_init(void);
1334void ip_vs_protocol_cleanup(void);
1335void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1336int *ip_vs_create_timeout_table(int *table, int size);
1337int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1338 const char *name, int to);
1339void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1340 const struct sk_buff *skb, int offset,
1341 const char *msg);
1342
1343extern struct ip_vs_protocol ip_vs_protocol_tcp;
1344extern struct ip_vs_protocol ip_vs_protocol_udp;
1345extern struct ip_vs_protocol ip_vs_protocol_icmp;
1346extern struct ip_vs_protocol ip_vs_protocol_esp;
1347extern struct ip_vs_protocol ip_vs_protocol_ah;
1348extern struct ip_vs_protocol ip_vs_protocol_sctp;
1349
1350/* Registering/unregistering scheduler functions
1351 * (from ip_vs_sched.c)
1352 */
1353int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1354int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1355int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1356 struct ip_vs_scheduler *scheduler);
1357void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1358 struct ip_vs_scheduler *sched);
1359struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1360void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1361struct ip_vs_conn *
1362ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1363 struct ip_vs_proto_data *pd, int *ignored,
1364 struct ip_vs_iphdr *iph);
1365int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1366 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1367
1368void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1369
1370/* IPVS control data and functions (from ip_vs_ctl.c) */
1371extern struct ip_vs_stats ip_vs_stats;
1372extern int sysctl_ip_vs_sync_ver;
1373
1374struct ip_vs_service *
1375ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1376 const union nf_inet_addr *vaddr, __be16 vport);
1377
1378bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1379 const union nf_inet_addr *daddr, __be16 dport);
1380
1381int ip_vs_use_count_inc(void);
1382void ip_vs_use_count_dec(void);
1383int ip_vs_register_nl_ioctl(void);
1384void ip_vs_unregister_nl_ioctl(void);
1385int ip_vs_control_init(void);
1386void ip_vs_control_cleanup(void);
1387struct ip_vs_dest *
1388ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1389 const union nf_inet_addr *daddr, __be16 dport,
1390 const union nf_inet_addr *vaddr, __be16 vport,
1391 __u16 protocol, __u32 fwmark, __u32 flags);
1392void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1393
1394static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1395{
1396 atomic_inc(&dest->refcnt);
1397}
1398
1399static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1400{
1401 smp_mb__before_atomic();
1402 atomic_dec(&dest->refcnt);
1403}
1404
1405static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1406{
1407 if (atomic_dec_return(&dest->refcnt) < 0)
1408 kfree(dest);
1409}
1410
1411/* IPVS sync daemon data and function prototypes
1412 * (from ip_vs_sync.c)
1413 */
1414int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1415 int state);
1416int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1417void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1418
1419/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1420void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1421void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1422void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1423void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1424
1425/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1426int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1427 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1428int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1429 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1430int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1431 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1432int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1433 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1434int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1435 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1436int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1437 struct ip_vs_protocol *pp, int offset,
1438 unsigned int hooknum, struct ip_vs_iphdr *iph);
1439void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1440
1441#ifdef CONFIG_IP_VS_IPV6
1442int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1443 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1444int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1445 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1446int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1447 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1448int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1449 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1450int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1451 struct ip_vs_protocol *pp, int offset,
1452 unsigned int hooknum, struct ip_vs_iphdr *iph);
1453#endif
1454
1455#ifdef CONFIG_SYSCTL
1456/* This is a simple mechanism to ignore packets when
1457 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1458 * we start to drop 1/rate of the packets
1459 */
1460static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1461{
1462 if (!ipvs->drop_rate)
1463 return 0;
1464 if (--ipvs->drop_counter > 0)
1465 return 0;
1466 ipvs->drop_counter = ipvs->drop_rate;
1467 return 1;
1468}
1469#else
1470static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1471#endif
1472
1473/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1474#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1475
1476static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1477{
1478 char fwd;
1479
1480 switch (IP_VS_FWD_METHOD(cp)) {
1481 case IP_VS_CONN_F_MASQ:
1482 fwd = 'M'; break;
1483 case IP_VS_CONN_F_LOCALNODE:
1484 fwd = 'L'; break;
1485 case IP_VS_CONN_F_TUNNEL:
1486 fwd = 'T'; break;
1487 case IP_VS_CONN_F_DROUTE:
1488 fwd = 'R'; break;
1489 case IP_VS_CONN_F_BYPASS:
1490 fwd = 'B'; break;
1491 default:
1492 fwd = '?'; break;
1493 }
1494 return fwd;
1495}
1496
1497void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1498 struct ip_vs_conn *cp, int dir);
1499
1500#ifdef CONFIG_IP_VS_IPV6
1501void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1502 struct ip_vs_conn *cp, int dir);
1503#endif
1504
1505__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1506
1507static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1508{
1509 __be32 diff[2] = { ~old, new };
1510
1511 return csum_partial(diff, sizeof(diff), oldsum);
1512}
1513
1514#ifdef CONFIG_IP_VS_IPV6
1515static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1516 __wsum oldsum)
1517{
1518 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1519 new[3], new[2], new[1], new[0] };
1520
1521 return csum_partial(diff, sizeof(diff), oldsum);
1522}
1523#endif
1524
1525static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1526{
1527 __be16 diff[2] = { ~old, new };
1528
1529 return csum_partial(diff, sizeof(diff), oldsum);
1530}
1531
1532/* Forget current conntrack (unconfirmed) and attach notrack entry */
1533static inline void ip_vs_notrack(struct sk_buff *skb)
1534{
1535#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1536 enum ip_conntrack_info ctinfo;
1537 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1538
1539 if (!ct || !nf_ct_is_untracked(ct)) {
1540 nf_conntrack_put(skb->nfct);
1541 skb->nfct = &nf_ct_untracked_get()->ct_general;
1542 skb->nfctinfo = IP_CT_NEW;
1543 nf_conntrack_get(skb->nfct);
1544 }
1545#endif
1546}
1547
1548#ifdef CONFIG_IP_VS_NFCT
1549/* Netfilter connection tracking
1550 * (from ip_vs_nfct.c)
1551 */
1552static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1553{
1554#ifdef CONFIG_SYSCTL
1555 return ipvs->sysctl_conntrack;
1556#else
1557 return 0;
1558#endif
1559}
1560
1561void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1562 int outin);
1563int ip_vs_confirm_conntrack(struct sk_buff *skb);
1564void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1565 struct ip_vs_conn *cp, u_int8_t proto,
1566 const __be16 port, int from_rs);
1567void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1568
1569#else
1570
1571static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1572{
1573 return 0;
1574}
1575
1576static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1577 struct ip_vs_conn *cp, int outin)
1578{
1579}
1580
1581static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1582{
1583 return NF_ACCEPT;
1584}
1585
1586static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1587{
1588}
1589#endif /* CONFIG_IP_VS_NFCT */
1590
1591/* Really using conntrack? */
1592static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1593 struct sk_buff *skb)
1594{
1595#ifdef CONFIG_IP_VS_NFCT
1596 enum ip_conntrack_info ctinfo;
1597 struct nf_conn *ct;
1598
1599 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1600 return false;
1601 ct = nf_ct_get(skb, &ctinfo);
1602 if (ct && !nf_ct_is_untracked(ct))
1603 return true;
1604#endif
1605 return false;
1606}
1607
1608static inline int
1609ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1610{
1611 /* We think the overhead of processing active connections is 256
1612 * times higher than that of inactive connections in average. (This
1613 * 256 times might not be accurate, we will change it later) We
1614 * use the following formula to estimate the overhead now:
1615 * dest->activeconns*256 + dest->inactconns
1616 */
1617 return (atomic_read(&dest->activeconns) << 8) +
1618 atomic_read(&dest->inactconns);
1619}
1620
1621#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#include <linux/workqueue.h>
18
19#include <linux/compiler.h>
20#include <linux/timer.h>
21#include <linux/bug.h>
22
23#include <net/checksum.h>
24#include <linux/netfilter.h> /* for union nf_inet_addr */
25#include <linux/ip.h>
26#include <linux/ipv6.h> /* for struct ipv6hdr */
27#include <net/ipv6.h>
28#if IS_ENABLED(CONFIG_IP_VS_IPV6)
29#include <linux/netfilter_ipv6/ip6_tables.h>
30#endif
31#if IS_ENABLED(CONFIG_NF_CONNTRACK)
32#include <net/netfilter/nf_conntrack.h>
33#endif
34#include <net/net_namespace.h> /* Netw namespace */
35
36#define IP_VS_HDR_INVERSE 1
37#define IP_VS_HDR_ICMP 2
38
39/* Generic access of ipvs struct */
40static inline struct netns_ipvs *net_ipvs(struct net* net)
41{
42 return net->ipvs;
43}
44
45/* Connections' size value needed by ip_vs_ctl.c */
46extern int ip_vs_conn_tab_size;
47
48struct ip_vs_iphdr {
49 int hdr_flags; /* ipvs flags */
50 __u32 off; /* Where IP or IPv4 header starts */
51 __u32 len; /* IPv4 simply where L4 starts
52 * IPv6 where L4 Transport Header starts */
53 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
54 __s16 protocol;
55 __s32 flags;
56 union nf_inet_addr saddr;
57 union nf_inet_addr daddr;
58};
59
60static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
61 int len, void *buffer)
62{
63 return skb_header_pointer(skb, offset, len, buffer);
64}
65
66/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
67 * IPv6 requires some extra work, as finding proper header position,
68 * depend on the IPv6 extension headers.
69 */
70static inline int
71ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
72 int hdr_flags, struct ip_vs_iphdr *iphdr)
73{
74 iphdr->hdr_flags = hdr_flags;
75 iphdr->off = offset;
76
77#ifdef CONFIG_IP_VS_IPV6
78 if (af == AF_INET6) {
79 struct ipv6hdr _iph;
80 const struct ipv6hdr *iph = skb_header_pointer(
81 skb, offset, sizeof(_iph), &_iph);
82 if (!iph)
83 return 0;
84
85 iphdr->saddr.in6 = iph->saddr;
86 iphdr->daddr.in6 = iph->daddr;
87 /* ipv6_find_hdr() updates len, flags */
88 iphdr->len = offset;
89 iphdr->flags = 0;
90 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
91 &iphdr->fragoffs,
92 &iphdr->flags);
93 if (iphdr->protocol < 0)
94 return 0;
95 } else
96#endif
97 {
98 struct iphdr _iph;
99 const struct iphdr *iph = skb_header_pointer(
100 skb, offset, sizeof(_iph), &_iph);
101 if (!iph)
102 return 0;
103
104 iphdr->len = offset + iph->ihl * 4;
105 iphdr->fragoffs = 0;
106 iphdr->protocol = iph->protocol;
107 iphdr->saddr.ip = iph->saddr;
108 iphdr->daddr.ip = iph->daddr;
109 }
110
111 return 1;
112}
113
114static inline int
115ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
116 bool inverse, struct ip_vs_iphdr *iphdr)
117{
118 int hdr_flags = IP_VS_HDR_ICMP;
119
120 if (inverse)
121 hdr_flags |= IP_VS_HDR_INVERSE;
122
123 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
124}
125
126static inline int
127ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
128 struct ip_vs_iphdr *iphdr)
129{
130 int hdr_flags = 0;
131
132 if (inverse)
133 hdr_flags |= IP_VS_HDR_INVERSE;
134
135 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
136 hdr_flags, iphdr);
137}
138
139static inline bool
140ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
141{
142 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
143}
144
145static inline bool
146ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
147{
148 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
149}
150
151static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
152 const union nf_inet_addr *src)
153{
154#ifdef CONFIG_IP_VS_IPV6
155 if (af == AF_INET6)
156 dst->in6 = src->in6;
157 else
158#endif
159 dst->ip = src->ip;
160}
161
162static inline void ip_vs_addr_set(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 return;
169 }
170#endif
171 dst->ip = src->ip;
172 dst->all[1] = 0;
173 dst->all[2] = 0;
174 dst->all[3] = 0;
175}
176
177static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
178 const union nf_inet_addr *b)
179{
180#ifdef CONFIG_IP_VS_IPV6
181 if (af == AF_INET6)
182 return ipv6_addr_equal(&a->in6, &b->in6);
183#endif
184 return a->ip == b->ip;
185}
186
187#ifdef CONFIG_IP_VS_DEBUG
188#include <linux/net.h>
189
190int ip_vs_get_debug_level(void);
191
192static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
193 const union nf_inet_addr *addr,
194 int *idx)
195{
196 int len;
197#ifdef CONFIG_IP_VS_IPV6
198 if (af == AF_INET6)
199 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
200 &addr->in6) + 1;
201 else
202#endif
203 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
204 &addr->ip) + 1;
205
206 *idx += len;
207 BUG_ON(*idx > buf_len + 1);
208 return &buf[*idx - len];
209}
210
211#define IP_VS_DBG_BUF(level, msg, ...) \
212 do { \
213 char ip_vs_dbg_buf[160]; \
214 int ip_vs_dbg_idx = 0; \
215 if (level <= ip_vs_get_debug_level()) \
216 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
217 } while (0)
218#define IP_VS_ERR_BUF(msg...) \
219 do { \
220 char ip_vs_dbg_buf[160]; \
221 int ip_vs_dbg_idx = 0; \
222 pr_err(msg); \
223 } while (0)
224
225/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
226#define IP_VS_DBG_ADDR(af, addr) \
227 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
228 sizeof(ip_vs_dbg_buf), addr, \
229 &ip_vs_dbg_idx)
230
231#define IP_VS_DBG(level, msg, ...) \
232 do { \
233 if (level <= ip_vs_get_debug_level()) \
234 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
235 } while (0)
236#define IP_VS_DBG_RL(msg, ...) \
237 do { \
238 if (net_ratelimit()) \
239 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
240 } while (0)
241#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
242 do { \
243 if (level <= ip_vs_get_debug_level()) \
244 pp->debug_packet(af, pp, skb, ofs, msg); \
245 } while (0)
246#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
247 do { \
248 if (level <= ip_vs_get_debug_level() && \
249 net_ratelimit()) \
250 pp->debug_packet(af, pp, skb, ofs, msg); \
251 } while (0)
252#else /* NO DEBUGGING at ALL */
253#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
254#define IP_VS_ERR_BUF(msg...) do {} while (0)
255#define IP_VS_DBG(level, msg...) do {} while (0)
256#define IP_VS_DBG_RL(msg...) do {} while (0)
257#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
258#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
259#endif
260
261#define IP_VS_BUG() BUG()
262#define IP_VS_ERR_RL(msg, ...) \
263 do { \
264 if (net_ratelimit()) \
265 pr_err(msg, ##__VA_ARGS__); \
266 } while (0)
267
268#ifdef CONFIG_IP_VS_DEBUG
269#define EnterFunction(level) \
270 do { \
271 if (level <= ip_vs_get_debug_level()) \
272 printk(KERN_DEBUG \
273 pr_fmt("Enter: %s, %s line %i\n"), \
274 __func__, __FILE__, __LINE__); \
275 } while (0)
276#define LeaveFunction(level) \
277 do { \
278 if (level <= ip_vs_get_debug_level()) \
279 printk(KERN_DEBUG \
280 pr_fmt("Leave: %s, %s line %i\n"), \
281 __func__, __FILE__, __LINE__); \
282 } while (0)
283#else
284#define EnterFunction(level) do {} while (0)
285#define LeaveFunction(level) do {} while (0)
286#endif
287
288/* The port number of FTP service (in network order). */
289#define FTPPORT cpu_to_be16(21)
290#define FTPDATA cpu_to_be16(20)
291
292/* TCP State Values */
293enum {
294 IP_VS_TCP_S_NONE = 0,
295 IP_VS_TCP_S_ESTABLISHED,
296 IP_VS_TCP_S_SYN_SENT,
297 IP_VS_TCP_S_SYN_RECV,
298 IP_VS_TCP_S_FIN_WAIT,
299 IP_VS_TCP_S_TIME_WAIT,
300 IP_VS_TCP_S_CLOSE,
301 IP_VS_TCP_S_CLOSE_WAIT,
302 IP_VS_TCP_S_LAST_ACK,
303 IP_VS_TCP_S_LISTEN,
304 IP_VS_TCP_S_SYNACK,
305 IP_VS_TCP_S_LAST
306};
307
308/* UDP State Values */
309enum {
310 IP_VS_UDP_S_NORMAL,
311 IP_VS_UDP_S_LAST,
312};
313
314/* ICMP State Values */
315enum {
316 IP_VS_ICMP_S_NORMAL,
317 IP_VS_ICMP_S_LAST,
318};
319
320/* SCTP State Values */
321enum ip_vs_sctp_states {
322 IP_VS_SCTP_S_NONE,
323 IP_VS_SCTP_S_INIT1,
324 IP_VS_SCTP_S_INIT,
325 IP_VS_SCTP_S_COOKIE_SENT,
326 IP_VS_SCTP_S_COOKIE_REPLIED,
327 IP_VS_SCTP_S_COOKIE_WAIT,
328 IP_VS_SCTP_S_COOKIE,
329 IP_VS_SCTP_S_COOKIE_ECHOED,
330 IP_VS_SCTP_S_ESTABLISHED,
331 IP_VS_SCTP_S_SHUTDOWN_SENT,
332 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
333 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
334 IP_VS_SCTP_S_REJECTED,
335 IP_VS_SCTP_S_CLOSED,
336 IP_VS_SCTP_S_LAST
337};
338
339/* Connection templates use bits from state */
340#define IP_VS_CTPL_S_NONE 0x0000
341#define IP_VS_CTPL_S_ASSURED 0x0001
342#define IP_VS_CTPL_S_LAST 0x0002
343
344/* Delta sequence info structure
345 * Each ip_vs_conn has 2 (output AND input seq. changes).
346 * Only used in the VS/NAT.
347 */
348struct ip_vs_seq {
349 __u32 init_seq; /* Add delta from this seq */
350 __u32 delta; /* Delta in sequence numbers */
351 __u32 previous_delta; /* Delta in sequence numbers
352 * before last resized pkt */
353};
354
355/* counters per cpu */
356struct ip_vs_counters {
357 __u64 conns; /* connections scheduled */
358 __u64 inpkts; /* incoming packets */
359 __u64 outpkts; /* outgoing packets */
360 __u64 inbytes; /* incoming bytes */
361 __u64 outbytes; /* outgoing bytes */
362};
363/* Stats per cpu */
364struct ip_vs_cpu_stats {
365 struct ip_vs_counters cnt;
366 struct u64_stats_sync syncp;
367};
368
369/* IPVS statistics objects */
370struct ip_vs_estimator {
371 struct list_head list;
372
373 u64 last_inbytes;
374 u64 last_outbytes;
375 u64 last_conns;
376 u64 last_inpkts;
377 u64 last_outpkts;
378
379 u64 cps;
380 u64 inpps;
381 u64 outpps;
382 u64 inbps;
383 u64 outbps;
384};
385
386/*
387 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
388 */
389struct ip_vs_kstats {
390 u64 conns; /* connections scheduled */
391 u64 inpkts; /* incoming packets */
392 u64 outpkts; /* outgoing packets */
393 u64 inbytes; /* incoming bytes */
394 u64 outbytes; /* outgoing bytes */
395
396 u64 cps; /* current connection rate */
397 u64 inpps; /* current in packet rate */
398 u64 outpps; /* current out packet rate */
399 u64 inbps; /* current in byte rate */
400 u64 outbps; /* current out byte rate */
401};
402
403struct ip_vs_stats {
404 struct ip_vs_kstats kstats; /* kernel statistics */
405 struct ip_vs_estimator est; /* estimator */
406 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
407 spinlock_t lock; /* spin lock */
408 struct ip_vs_kstats kstats0; /* reset values */
409};
410
411struct dst_entry;
412struct iphdr;
413struct ip_vs_conn;
414struct ip_vs_app;
415struct sk_buff;
416struct ip_vs_proto_data;
417
418struct ip_vs_protocol {
419 struct ip_vs_protocol *next;
420 char *name;
421 u16 protocol;
422 u16 num_states;
423 int dont_defrag;
424
425 void (*init)(struct ip_vs_protocol *pp);
426
427 void (*exit)(struct ip_vs_protocol *pp);
428
429 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
430
431 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
432
433 int (*conn_schedule)(struct netns_ipvs *ipvs,
434 int af, struct sk_buff *skb,
435 struct ip_vs_proto_data *pd,
436 int *verdict, struct ip_vs_conn **cpp,
437 struct ip_vs_iphdr *iph);
438
439 struct ip_vs_conn *
440 (*conn_in_get)(struct netns_ipvs *ipvs,
441 int af,
442 const struct sk_buff *skb,
443 const struct ip_vs_iphdr *iph);
444
445 struct ip_vs_conn *
446 (*conn_out_get)(struct netns_ipvs *ipvs,
447 int af,
448 const struct sk_buff *skb,
449 const struct ip_vs_iphdr *iph);
450
451 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
452 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
453
454 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
455 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
456
457 const char *(*state_name)(int state);
458
459 void (*state_transition)(struct ip_vs_conn *cp, int direction,
460 const struct sk_buff *skb,
461 struct ip_vs_proto_data *pd);
462
463 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
464
465 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
466
467 int (*app_conn_bind)(struct ip_vs_conn *cp);
468
469 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
470 const struct sk_buff *skb,
471 int offset,
472 const char *msg);
473
474 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
475};
476
477/* protocol data per netns */
478struct ip_vs_proto_data {
479 struct ip_vs_proto_data *next;
480 struct ip_vs_protocol *pp;
481 int *timeout_table; /* protocol timeout table */
482 atomic_t appcnt; /* counter of proto app incs. */
483 struct tcp_states_t *tcp_state_table;
484};
485
486struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
487struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
488 unsigned short proto);
489
490struct ip_vs_conn_param {
491 struct netns_ipvs *ipvs;
492 const union nf_inet_addr *caddr;
493 const union nf_inet_addr *vaddr;
494 __be16 cport;
495 __be16 vport;
496 __u16 protocol;
497 u16 af;
498
499 const struct ip_vs_pe *pe;
500 char *pe_data;
501 __u8 pe_data_len;
502};
503
504/* IP_VS structure allocated for each dynamically scheduled connection */
505struct ip_vs_conn {
506 struct hlist_node c_list; /* hashed list heads */
507 /* Protocol, addresses and port numbers */
508 __be16 cport;
509 __be16 dport;
510 __be16 vport;
511 u16 af; /* address family */
512 union nf_inet_addr caddr; /* client address */
513 union nf_inet_addr vaddr; /* virtual address */
514 union nf_inet_addr daddr; /* destination address */
515 volatile __u32 flags; /* status flags */
516 __u16 protocol; /* Which protocol (TCP/UDP) */
517 __u16 daf; /* Address family of the dest */
518 struct netns_ipvs *ipvs;
519
520 /* counter and timer */
521 refcount_t refcnt; /* reference count */
522 struct timer_list timer; /* Expiration timer */
523 volatile unsigned long timeout; /* timeout */
524
525 /* Flags and state transition */
526 spinlock_t lock; /* lock for state transition */
527 volatile __u16 state; /* state info */
528 volatile __u16 old_state; /* old state, to be used for
529 * state transition triggerd
530 * synchronization
531 */
532 __u32 fwmark; /* Fire wall mark from skb */
533 unsigned long sync_endtime; /* jiffies + sent_retries */
534
535 /* Control members */
536 struct ip_vs_conn *control; /* Master control connection */
537 atomic_t n_control; /* Number of controlled ones */
538 struct ip_vs_dest *dest; /* real server */
539 atomic_t in_pkts; /* incoming packet counter */
540
541 /* Packet transmitter for different forwarding methods. If it
542 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
543 * otherwise this must be changed to a sk_buff **.
544 * NF_ACCEPT can be returned when destination is local.
545 */
546 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
547 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
548
549 /* Note: we can group the following members into a structure,
550 * in order to save more space, and the following members are
551 * only used in VS/NAT anyway
552 */
553 struct ip_vs_app *app; /* bound ip_vs_app object */
554 void *app_data; /* Application private data */
555 struct ip_vs_seq in_seq; /* incoming seq. struct */
556 struct ip_vs_seq out_seq; /* outgoing seq. struct */
557
558 const struct ip_vs_pe *pe;
559 char *pe_data;
560 __u8 pe_data_len;
561
562 struct rcu_head rcu_head;
563};
564
565/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
566 * for IPv6 support.
567 *
568 * We need these to conveniently pass around service and destination
569 * options, but unfortunately, we also need to keep the old definitions to
570 * maintain userspace backwards compatibility for the setsockopt interface.
571 */
572struct ip_vs_service_user_kern {
573 /* virtual service addresses */
574 u16 af;
575 u16 protocol;
576 union nf_inet_addr addr; /* virtual ip address */
577 __be16 port;
578 u32 fwmark; /* firwall mark of service */
579
580 /* virtual service options */
581 char *sched_name;
582 char *pe_name;
583 unsigned int flags; /* virtual service flags */
584 unsigned int timeout; /* persistent timeout in sec */
585 __be32 netmask; /* persistent netmask or plen */
586};
587
588
589struct ip_vs_dest_user_kern {
590 /* destination server address */
591 union nf_inet_addr addr;
592 __be16 port;
593
594 /* real server options */
595 unsigned int conn_flags; /* connection flags */
596 int weight; /* destination weight */
597
598 /* thresholds for active connections */
599 u32 u_threshold; /* upper threshold */
600 u32 l_threshold; /* lower threshold */
601
602 /* Address family of addr */
603 u16 af;
604
605 u16 tun_type; /* tunnel type */
606 __be16 tun_port; /* tunnel port */
607 u16 tun_flags; /* tunnel flags */
608};
609
610
611/*
612 * The information about the virtual service offered to the net and the
613 * forwarding entries.
614 */
615struct ip_vs_service {
616 struct hlist_node s_list; /* for normal service table */
617 struct hlist_node f_list; /* for fwmark-based service table */
618 atomic_t refcnt; /* reference counter */
619
620 u16 af; /* address family */
621 __u16 protocol; /* which protocol (TCP/UDP) */
622 union nf_inet_addr addr; /* IP address for virtual service */
623 __be16 port; /* port number for the service */
624 __u32 fwmark; /* firewall mark of the service */
625 unsigned int flags; /* service status flags */
626 unsigned int timeout; /* persistent timeout in ticks */
627 __be32 netmask; /* grouping granularity, mask/plen */
628 struct netns_ipvs *ipvs;
629
630 struct list_head destinations; /* real server d-linked list */
631 __u32 num_dests; /* number of servers */
632 struct ip_vs_stats stats; /* statistics for the service */
633
634 /* for scheduling */
635 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
636 spinlock_t sched_lock; /* lock sched_data */
637 void *sched_data; /* scheduler application data */
638
639 /* alternate persistence engine */
640 struct ip_vs_pe __rcu *pe;
641 int conntrack_afmask;
642
643 struct rcu_head rcu_head;
644};
645
646/* Information for cached dst */
647struct ip_vs_dest_dst {
648 struct dst_entry *dst_cache; /* destination cache entry */
649 u32 dst_cookie;
650 union nf_inet_addr dst_saddr;
651 struct rcu_head rcu_head;
652};
653
654/* The real server destination forwarding entry with ip address, port number,
655 * and so on.
656 */
657struct ip_vs_dest {
658 struct list_head n_list; /* for the dests in the service */
659 struct hlist_node d_list; /* for table with all the dests */
660
661 u16 af; /* address family */
662 __be16 port; /* port number of the server */
663 union nf_inet_addr addr; /* IP address of the server */
664 volatile unsigned int flags; /* dest status flags */
665 atomic_t conn_flags; /* flags to copy to conn */
666 atomic_t weight; /* server weight */
667 atomic_t last_weight; /* server latest weight */
668 __u16 tun_type; /* tunnel type */
669 __be16 tun_port; /* tunnel port */
670 __u16 tun_flags; /* tunnel flags */
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, struct ip_vs_iphdr *ipvsh);
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, struct ip_vs_iphdr *ipvsh);
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 delayed_work master_wakeup_work;
815 struct netns_ipvs *ipvs;
816};
817
818struct ip_vs_sync_thread_data;
819
820/* How much time to keep dests in trash */
821#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
822
823struct ipvs_sync_daemon_cfg {
824 union nf_inet_addr mcast_group;
825 int syncid;
826 u16 sync_maxlen;
827 u16 mcast_port;
828 u8 mcast_af;
829 u8 mcast_ttl;
830 /* multicast interface name */
831 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
832};
833
834/* IPVS in network namespace */
835struct netns_ipvs {
836 int gen; /* Generation */
837 int enable; /* enable like nf_hooks do */
838 /* Hash table: for real service lookups */
839 #define IP_VS_RTAB_BITS 4
840 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
841 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
842
843 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
844 /* ip_vs_app */
845 struct list_head app_list;
846 /* ip_vs_proto */
847 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
848 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
849 /* ip_vs_proto_tcp */
850#ifdef CONFIG_IP_VS_PROTO_TCP
851 #define TCP_APP_TAB_BITS 4
852 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
853 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
854 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
855#endif
856 /* ip_vs_proto_udp */
857#ifdef CONFIG_IP_VS_PROTO_UDP
858 #define UDP_APP_TAB_BITS 4
859 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
860 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
861 struct list_head udp_apps[UDP_APP_TAB_SIZE];
862#endif
863 /* ip_vs_proto_sctp */
864#ifdef CONFIG_IP_VS_PROTO_SCTP
865 #define SCTP_APP_TAB_BITS 4
866 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
867 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
868 /* Hash table for SCTP application incarnations */
869 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
870#endif
871 /* ip_vs_conn */
872 atomic_t conn_count; /* connection counter */
873
874 /* ip_vs_ctl */
875 struct ip_vs_stats tot_stats; /* Statistics & est. */
876
877 int num_services; /* no of virtual services */
878 int num_services6; /* IPv6 virtual services */
879
880 /* Trash for destinations */
881 struct list_head dest_trash;
882 spinlock_t dest_trash_lock;
883 struct timer_list dest_trash_timer; /* expiration timer */
884 /* Service counters */
885 atomic_t ftpsvc_counter;
886 atomic_t nullsvc_counter;
887 atomic_t conn_out_counter;
888
889#ifdef CONFIG_SYSCTL
890 /* delayed work for expiring no dest connections */
891 struct delayed_work expire_nodest_conn_work;
892 /* 1/rate drop and drop-entry variables */
893 struct delayed_work defense_work; /* Work handler */
894 int drop_rate;
895 int drop_counter;
896 int old_secure_tcp;
897 atomic_t dropentry;
898 /* locks in ctl.c */
899 spinlock_t dropentry_lock; /* drop entry handling */
900 spinlock_t droppacket_lock; /* drop packet handling */
901 spinlock_t securetcp_lock; /* state and timeout tables */
902
903 /* sys-ctl struct */
904 struct ctl_table_header *sysctl_hdr;
905 struct ctl_table *sysctl_tbl;
906#endif
907
908 /* sysctl variables */
909 int sysctl_amemthresh;
910 int sysctl_am_droprate;
911 int sysctl_drop_entry;
912 int sysctl_drop_packet;
913 int sysctl_secure_tcp;
914#ifdef CONFIG_IP_VS_NFCT
915 int sysctl_conntrack;
916#endif
917 int sysctl_snat_reroute;
918 int sysctl_sync_ver;
919 int sysctl_sync_ports;
920 int sysctl_sync_persist_mode;
921 unsigned long sysctl_sync_qlen_max;
922 int sysctl_sync_sock_size;
923 int sysctl_cache_bypass;
924 int sysctl_expire_nodest_conn;
925 int sysctl_sloppy_tcp;
926 int sysctl_sloppy_sctp;
927 int sysctl_expire_quiescent_template;
928 int sysctl_sync_threshold[2];
929 unsigned int sysctl_sync_refresh_period;
930 int sysctl_sync_retries;
931 int sysctl_nat_icmp_send;
932 int sysctl_pmtu_disc;
933 int sysctl_backup_only;
934 int sysctl_conn_reuse_mode;
935 int sysctl_schedule_icmp;
936 int sysctl_ignore_tunneled;
937
938 /* ip_vs_lblc */
939 int sysctl_lblc_expiration;
940 struct ctl_table_header *lblc_ctl_header;
941 struct ctl_table *lblc_ctl_table;
942 /* ip_vs_lblcr */
943 int sysctl_lblcr_expiration;
944 struct ctl_table_header *lblcr_ctl_header;
945 struct ctl_table *lblcr_ctl_table;
946 /* ip_vs_est */
947 struct list_head est_list; /* estimator list */
948 spinlock_t est_lock;
949 struct timer_list est_timer; /* Estimation timer */
950 /* ip_vs_sync */
951 spinlock_t sync_lock;
952 struct ipvs_master_sync_state *ms;
953 spinlock_t sync_buff_lock;
954 struct ip_vs_sync_thread_data *master_tinfo;
955 struct ip_vs_sync_thread_data *backup_tinfo;
956 int threads_mask;
957 volatile int sync_state;
958 struct mutex sync_mutex;
959 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
960 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
961 /* net name space ptr */
962 struct net *net; /* Needed by timer routines */
963 /* Number of heterogeneous destinations, needed becaus heterogeneous
964 * are not supported when synchronization is enabled.
965 */
966 unsigned int mixed_address_family_dests;
967 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
968};
969
970#define DEFAULT_SYNC_THRESHOLD 3
971#define DEFAULT_SYNC_PERIOD 50
972#define DEFAULT_SYNC_VER 1
973#define DEFAULT_SLOPPY_TCP 0
974#define DEFAULT_SLOPPY_SCTP 0
975#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
976#define DEFAULT_SYNC_RETRIES 0
977#define IPVS_SYNC_WAKEUP_RATE 8
978#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
979#define IPVS_SYNC_SEND_DELAY (HZ / 50)
980#define IPVS_SYNC_CHECK_PERIOD HZ
981#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
982#define IPVS_SYNC_PORTS_MAX (1 << 6)
983
984#ifdef CONFIG_SYSCTL
985
986static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
987{
988 return ipvs->sysctl_sync_threshold[0];
989}
990
991static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
992{
993 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
994}
995
996static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
997{
998 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
999}
1000
1001static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1002{
1003 return ipvs->sysctl_sync_retries;
1004}
1005
1006static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1007{
1008 return ipvs->sysctl_sync_ver;
1009}
1010
1011static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1012{
1013 return ipvs->sysctl_sloppy_tcp;
1014}
1015
1016static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1017{
1018 return ipvs->sysctl_sloppy_sctp;
1019}
1020
1021static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1022{
1023 return READ_ONCE(ipvs->sysctl_sync_ports);
1024}
1025
1026static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1027{
1028 return ipvs->sysctl_sync_persist_mode;
1029}
1030
1031static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1032{
1033 return ipvs->sysctl_sync_qlen_max;
1034}
1035
1036static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1037{
1038 return ipvs->sysctl_sync_sock_size;
1039}
1040
1041static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1042{
1043 return ipvs->sysctl_pmtu_disc;
1044}
1045
1046static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1047{
1048 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1049 ipvs->sysctl_backup_only;
1050}
1051
1052static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1053{
1054 return ipvs->sysctl_conn_reuse_mode;
1055}
1056
1057static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1058{
1059 return ipvs->sysctl_expire_nodest_conn;
1060}
1061
1062static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1063{
1064 return ipvs->sysctl_schedule_icmp;
1065}
1066
1067static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1068{
1069 return ipvs->sysctl_ignore_tunneled;
1070}
1071
1072static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1073{
1074 return ipvs->sysctl_cache_bypass;
1075}
1076
1077#else
1078
1079static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1080{
1081 return DEFAULT_SYNC_THRESHOLD;
1082}
1083
1084static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1085{
1086 return DEFAULT_SYNC_PERIOD;
1087}
1088
1089static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1090{
1091 return DEFAULT_SYNC_REFRESH_PERIOD;
1092}
1093
1094static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1095{
1096 return DEFAULT_SYNC_RETRIES & 3;
1097}
1098
1099static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1100{
1101 return DEFAULT_SYNC_VER;
1102}
1103
1104static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1105{
1106 return DEFAULT_SLOPPY_TCP;
1107}
1108
1109static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1110{
1111 return DEFAULT_SLOPPY_SCTP;
1112}
1113
1114static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1115{
1116 return 1;
1117}
1118
1119static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1120{
1121 return 0;
1122}
1123
1124static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1125{
1126 return IPVS_SYNC_QLEN_MAX;
1127}
1128
1129static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1130{
1131 return 0;
1132}
1133
1134static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1135{
1136 return 1;
1137}
1138
1139static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1140{
1141 return 0;
1142}
1143
1144static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1145{
1146 return 1;
1147}
1148
1149static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1150{
1151 return 0;
1152}
1153
1154static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1155{
1156 return 0;
1157}
1158
1159static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1160{
1161 return 0;
1162}
1163
1164static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1165{
1166 return 0;
1167}
1168
1169#endif
1170
1171/* IPVS core functions
1172 * (from ip_vs_core.c)
1173 */
1174const char *ip_vs_proto_name(unsigned int proto);
1175void ip_vs_init_hash_table(struct list_head *table, int rows);
1176struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1177 struct ip_vs_dest *dest,
1178 struct sk_buff *skb,
1179 const struct ip_vs_iphdr *iph,
1180 __be16 dport,
1181 __be16 cport);
1182#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1183
1184#define IP_VS_APP_TYPE_FTP 1
1185
1186/* ip_vs_conn handling functions
1187 * (from ip_vs_conn.c)
1188 */
1189enum {
1190 IP_VS_DIR_INPUT = 0,
1191 IP_VS_DIR_OUTPUT,
1192 IP_VS_DIR_INPUT_ONLY,
1193 IP_VS_DIR_LAST,
1194};
1195
1196static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1197 const union nf_inet_addr *caddr,
1198 __be16 cport,
1199 const union nf_inet_addr *vaddr,
1200 __be16 vport,
1201 struct ip_vs_conn_param *p)
1202{
1203 p->ipvs = ipvs;
1204 p->af = af;
1205 p->protocol = protocol;
1206 p->caddr = caddr;
1207 p->cport = cport;
1208 p->vaddr = vaddr;
1209 p->vport = vport;
1210 p->pe = NULL;
1211 p->pe_data = NULL;
1212}
1213
1214struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1215struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1216
1217struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1218 const struct sk_buff *skb,
1219 const struct ip_vs_iphdr *iph);
1220
1221struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1222
1223struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1224 const struct sk_buff *skb,
1225 const struct ip_vs_iphdr *iph);
1226
1227/* Get reference to gain full access to conn.
1228 * By default, RCU read-side critical sections have access only to
1229 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1230 */
1231static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1232{
1233 return refcount_inc_not_zero(&cp->refcnt);
1234}
1235
1236/* put back the conn without restarting its timer */
1237static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1238{
1239 smp_mb__before_atomic();
1240 refcount_dec(&cp->refcnt);
1241}
1242void ip_vs_conn_put(struct ip_vs_conn *cp);
1243void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1244
1245struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1246 const union nf_inet_addr *daddr,
1247 __be16 dport, unsigned int flags,
1248 struct ip_vs_dest *dest, __u32 fwmark);
1249void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1250
1251const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1252
1253void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1254int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1255void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1256int ip_vs_conn_init(void);
1257void ip_vs_conn_cleanup(void);
1258
1259static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1260{
1261 struct ip_vs_conn *ctl_cp = cp->control;
1262 if (!ctl_cp) {
1263 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1264 "%s:%d to %s:%d\n",
1265 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1266 ntohs(cp->cport),
1267 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1268 ntohs(cp->vport));
1269
1270 return;
1271 }
1272
1273 IP_VS_DBG_BUF(7, "DELeting control for: "
1274 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1275 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1276 ntohs(cp->cport),
1277 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1278 ntohs(ctl_cp->cport));
1279
1280 cp->control = NULL;
1281 if (atomic_read(&ctl_cp->n_control) == 0) {
1282 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1283 "%s:%d to %s:%d\n",
1284 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1285 ntohs(cp->cport),
1286 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1287 ntohs(cp->vport));
1288
1289 return;
1290 }
1291 atomic_dec(&ctl_cp->n_control);
1292}
1293
1294static inline void
1295ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1296{
1297 if (cp->control) {
1298 IP_VS_ERR_BUF("request control ADD for already controlled: "
1299 "%s:%d to %s:%d\n",
1300 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1301 ntohs(cp->cport),
1302 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1303 ntohs(cp->vport));
1304
1305 ip_vs_control_del(cp);
1306 }
1307
1308 IP_VS_DBG_BUF(7, "ADDing control for: "
1309 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1310 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1311 ntohs(cp->cport),
1312 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1313 ntohs(ctl_cp->cport));
1314
1315 cp->control = ctl_cp;
1316 atomic_inc(&ctl_cp->n_control);
1317}
1318
1319/* Mark our template as assured */
1320static inline void
1321ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1322{
1323 struct ip_vs_conn *ct = cp->control;
1324
1325 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1326 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1327 ct->state |= IP_VS_CTPL_S_ASSURED;
1328}
1329
1330/* IPVS netns init & cleanup functions */
1331int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1332int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1333int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1334int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1335int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1336int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1337void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1338void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1339void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1340void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1341void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1342void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1343void ip_vs_service_nets_cleanup(struct list_head *net_list);
1344
1345/* IPVS application functions
1346 * (from ip_vs_app.c)
1347 */
1348#define IP_VS_APP_MAX_PORTS 8
1349struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1350void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1351int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1352void ip_vs_unbind_app(struct ip_vs_conn *cp);
1353int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1354 __u16 port);
1355int ip_vs_app_inc_get(struct ip_vs_app *inc);
1356void ip_vs_app_inc_put(struct ip_vs_app *inc);
1357
1358int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1359 struct ip_vs_iphdr *ipvsh);
1360int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1361 struct ip_vs_iphdr *ipvsh);
1362
1363int register_ip_vs_pe(struct ip_vs_pe *pe);
1364int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1365struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1366struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1367
1368/* Use a #define to avoid all of module.h just for these trivial ops */
1369#define ip_vs_pe_get(pe) \
1370 if (pe && pe->module) \
1371 __module_get(pe->module);
1372
1373#define ip_vs_pe_put(pe) \
1374 if (pe && pe->module) \
1375 module_put(pe->module);
1376
1377/* IPVS protocol functions (from ip_vs_proto.c) */
1378int ip_vs_protocol_init(void);
1379void ip_vs_protocol_cleanup(void);
1380void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1381int *ip_vs_create_timeout_table(int *table, int size);
1382void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1383 const struct sk_buff *skb, int offset,
1384 const char *msg);
1385
1386extern struct ip_vs_protocol ip_vs_protocol_tcp;
1387extern struct ip_vs_protocol ip_vs_protocol_udp;
1388extern struct ip_vs_protocol ip_vs_protocol_icmp;
1389extern struct ip_vs_protocol ip_vs_protocol_esp;
1390extern struct ip_vs_protocol ip_vs_protocol_ah;
1391extern struct ip_vs_protocol ip_vs_protocol_sctp;
1392
1393/* Registering/unregistering scheduler functions
1394 * (from ip_vs_sched.c)
1395 */
1396int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1397int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1398int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1399 struct ip_vs_scheduler *scheduler);
1400void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1401 struct ip_vs_scheduler *sched);
1402struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1403void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1404struct ip_vs_conn *
1405ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1406 struct ip_vs_proto_data *pd, int *ignored,
1407 struct ip_vs_iphdr *iph);
1408int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1409 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1410
1411void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1412
1413/* IPVS control data and functions (from ip_vs_ctl.c) */
1414extern struct ip_vs_stats ip_vs_stats;
1415extern int sysctl_ip_vs_sync_ver;
1416
1417struct ip_vs_service *
1418ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1419 const union nf_inet_addr *vaddr, __be16 vport);
1420
1421bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1422 const union nf_inet_addr *daddr, __be16 dport);
1423
1424struct ip_vs_dest *
1425ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1426 const union nf_inet_addr *daddr, __be16 dport);
1427struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1428 const union nf_inet_addr *daddr,
1429 __be16 tun_port);
1430
1431int ip_vs_use_count_inc(void);
1432void ip_vs_use_count_dec(void);
1433int ip_vs_register_nl_ioctl(void);
1434void ip_vs_unregister_nl_ioctl(void);
1435int ip_vs_control_init(void);
1436void ip_vs_control_cleanup(void);
1437struct ip_vs_dest *
1438ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1439 const union nf_inet_addr *daddr, __be16 dport,
1440 const union nf_inet_addr *vaddr, __be16 vport,
1441 __u16 protocol, __u32 fwmark, __u32 flags);
1442void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1443
1444static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1445{
1446 refcount_inc(&dest->refcnt);
1447}
1448
1449static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1450{
1451 smp_mb__before_atomic();
1452 refcount_dec(&dest->refcnt);
1453}
1454
1455static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1456{
1457 if (refcount_dec_and_test(&dest->refcnt))
1458 kfree(dest);
1459}
1460
1461/* IPVS sync daemon data and function prototypes
1462 * (from ip_vs_sync.c)
1463 */
1464int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1465 int state);
1466int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1467void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1468
1469/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1470void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1471void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1472void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1473void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1474
1475/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1476int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1477 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1478int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1479 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1480int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1481 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1482int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1483 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1484int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1485 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1486int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1487 struct ip_vs_protocol *pp, int offset,
1488 unsigned int hooknum, struct ip_vs_iphdr *iph);
1489void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1490
1491#ifdef CONFIG_IP_VS_IPV6
1492int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1493 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1494int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1495 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1496int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1497 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1498int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1499 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1500int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1501 struct ip_vs_protocol *pp, int offset,
1502 unsigned int hooknum, struct ip_vs_iphdr *iph);
1503#endif
1504
1505#ifdef CONFIG_SYSCTL
1506/* This is a simple mechanism to ignore packets when
1507 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1508 * we start to drop 1/rate of the packets
1509 */
1510static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1511{
1512 if (!ipvs->drop_rate)
1513 return 0;
1514 if (--ipvs->drop_counter > 0)
1515 return 0;
1516 ipvs->drop_counter = ipvs->drop_rate;
1517 return 1;
1518}
1519#else
1520static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1521#endif
1522
1523#ifdef CONFIG_SYSCTL
1524/* Enqueue delayed work for expiring no dest connections
1525 * Only run when sysctl_expire_nodest=1
1526 */
1527static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1528{
1529 if (sysctl_expire_nodest_conn(ipvs))
1530 queue_delayed_work(system_long_wq,
1531 &ipvs->expire_nodest_conn_work, 1);
1532}
1533
1534void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1535#else
1536static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1537#endif
1538
1539#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1540 IP_VS_CONN_F_FWD_MASK)
1541
1542/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1543#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1544
1545static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1546{
1547 char fwd;
1548
1549 switch (IP_VS_FWD_METHOD(cp)) {
1550 case IP_VS_CONN_F_MASQ:
1551 fwd = 'M'; break;
1552 case IP_VS_CONN_F_LOCALNODE:
1553 fwd = 'L'; break;
1554 case IP_VS_CONN_F_TUNNEL:
1555 fwd = 'T'; break;
1556 case IP_VS_CONN_F_DROUTE:
1557 fwd = 'R'; break;
1558 case IP_VS_CONN_F_BYPASS:
1559 fwd = 'B'; break;
1560 default:
1561 fwd = '?'; break;
1562 }
1563 return fwd;
1564}
1565
1566void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1567 struct ip_vs_conn *cp, int dir);
1568
1569#ifdef CONFIG_IP_VS_IPV6
1570void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1571 struct ip_vs_conn *cp, int dir);
1572#endif
1573
1574__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1575
1576static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1577{
1578 __be32 diff[2] = { ~old, new };
1579
1580 return csum_partial(diff, sizeof(diff), oldsum);
1581}
1582
1583#ifdef CONFIG_IP_VS_IPV6
1584static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1585 __wsum oldsum)
1586{
1587 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1588 new[3], new[2], new[1], new[0] };
1589
1590 return csum_partial(diff, sizeof(diff), oldsum);
1591}
1592#endif
1593
1594static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1595{
1596 __be16 diff[2] = { ~old, new };
1597
1598 return csum_partial(diff, sizeof(diff), oldsum);
1599}
1600
1601/* Forget current conntrack (unconfirmed) and attach notrack entry */
1602static inline void ip_vs_notrack(struct sk_buff *skb)
1603{
1604#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1605 enum ip_conntrack_info ctinfo;
1606 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1607
1608 if (ct) {
1609 nf_conntrack_put(&ct->ct_general);
1610 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1611 }
1612#endif
1613}
1614
1615#ifdef CONFIG_IP_VS_NFCT
1616/* Netfilter connection tracking
1617 * (from ip_vs_nfct.c)
1618 */
1619static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1620{
1621#ifdef CONFIG_SYSCTL
1622 return ipvs->sysctl_conntrack;
1623#else
1624 return 0;
1625#endif
1626}
1627
1628void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1629 int outin);
1630int ip_vs_confirm_conntrack(struct sk_buff *skb);
1631void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1632 struct ip_vs_conn *cp, u_int8_t proto,
1633 const __be16 port, int from_rs);
1634void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1635
1636#else
1637
1638static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1639{
1640 return 0;
1641}
1642
1643static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1644 struct ip_vs_conn *cp, int outin)
1645{
1646}
1647
1648static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1649{
1650 return NF_ACCEPT;
1651}
1652
1653static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1654{
1655}
1656#endif /* CONFIG_IP_VS_NFCT */
1657
1658/* Using old conntrack that can not be redirected to another real server? */
1659static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1660 struct sk_buff *skb)
1661{
1662#ifdef CONFIG_IP_VS_NFCT
1663 enum ip_conntrack_info ctinfo;
1664 struct nf_conn *ct;
1665
1666 ct = nf_ct_get(skb, &ctinfo);
1667 if (ct && nf_ct_is_confirmed(ct))
1668 return true;
1669#endif
1670 return false;
1671}
1672
1673static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1674{
1675#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1676 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1677 int ret = 0;
1678
1679 if (!(svc->conntrack_afmask & afmask)) {
1680 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1681 if (ret >= 0)
1682 svc->conntrack_afmask |= afmask;
1683 }
1684 return ret;
1685#else
1686 return 0;
1687#endif
1688}
1689
1690static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1691{
1692#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1693 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1694
1695 if (svc->conntrack_afmask & afmask) {
1696 nf_ct_netns_put(svc->ipvs->net, svc->af);
1697 svc->conntrack_afmask &= ~afmask;
1698 }
1699#endif
1700}
1701
1702int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1703void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1704
1705static inline int
1706ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1707{
1708 /* We think the overhead of processing active connections is 256
1709 * times higher than that of inactive connections in average. (This
1710 * 256 times might not be accurate, we will change it later) We
1711 * use the following formula to estimate the overhead now:
1712 * dest->activeconns*256 + dest->inactconns
1713 */
1714 return (atomic_read(&dest->activeconns) << 8) +
1715 atomic_read(&dest->inactconns);
1716}
1717
1718#endif /* _NET_IP_VS_H */