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1/* SPDX-License-Identifier: GPL-2.0 */
2/* IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
8
9#include <linux/ip_vs.h> /* definitions shared with userland */
10
11#include <asm/types.h> /* for __uXX types */
12
13#include <linux/list.h> /* for struct list_head */
14#include <linux/spinlock.h> /* for struct rwlock_t */
15#include <linux/atomic.h> /* for struct atomic_t */
16#include <linux/refcount.h> /* for struct refcount_t */
17
18#include <linux/compiler.h>
19#include <linux/timer.h>
20#include <linux/bug.h>
21
22#include <net/checksum.h>
23#include <linux/netfilter.h> /* for union nf_inet_addr */
24#include <linux/ip.h>
25#include <linux/ipv6.h> /* for struct ipv6hdr */
26#include <net/ipv6.h>
27#if IS_ENABLED(CONFIG_IP_VS_IPV6)
28#include <linux/netfilter_ipv6/ip6_tables.h>
29#endif
30#if IS_ENABLED(CONFIG_NF_CONNTRACK)
31#include <net/netfilter/nf_conntrack.h>
32#endif
33#include <net/net_namespace.h> /* Netw namespace */
34
35#define IP_VS_HDR_INVERSE 1
36#define IP_VS_HDR_ICMP 2
37
38/* Generic access of ipvs struct */
39static inline struct netns_ipvs *net_ipvs(struct net* net)
40{
41 return net->ipvs;
42}
43
44/* Connections' size value needed by ip_vs_ctl.c */
45extern int ip_vs_conn_tab_size;
46
47struct ip_vs_iphdr {
48 int hdr_flags; /* ipvs flags */
49 __u32 off; /* Where IP or IPv4 header starts */
50 __u32 len; /* IPv4 simply where L4 starts
51 * IPv6 where L4 Transport Header starts */
52 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
53 __s16 protocol;
54 __s32 flags;
55 union nf_inet_addr saddr;
56 union nf_inet_addr daddr;
57};
58
59static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
60 int len, void *buffer)
61{
62 return skb_header_pointer(skb, offset, len, buffer);
63}
64
65/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
66 * IPv6 requires some extra work, as finding proper header position,
67 * depend on the IPv6 extension headers.
68 */
69static inline int
70ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
71 int hdr_flags, struct ip_vs_iphdr *iphdr)
72{
73 iphdr->hdr_flags = hdr_flags;
74 iphdr->off = offset;
75
76#ifdef CONFIG_IP_VS_IPV6
77 if (af == AF_INET6) {
78 struct ipv6hdr _iph;
79 const struct ipv6hdr *iph = skb_header_pointer(
80 skb, offset, sizeof(_iph), &_iph);
81 if (!iph)
82 return 0;
83
84 iphdr->saddr.in6 = iph->saddr;
85 iphdr->daddr.in6 = iph->daddr;
86 /* ipv6_find_hdr() updates len, flags */
87 iphdr->len = offset;
88 iphdr->flags = 0;
89 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
90 &iphdr->fragoffs,
91 &iphdr->flags);
92 if (iphdr->protocol < 0)
93 return 0;
94 } else
95#endif
96 {
97 struct iphdr _iph;
98 const struct iphdr *iph = skb_header_pointer(
99 skb, offset, sizeof(_iph), &_iph);
100 if (!iph)
101 return 0;
102
103 iphdr->len = offset + iph->ihl * 4;
104 iphdr->fragoffs = 0;
105 iphdr->protocol = iph->protocol;
106 iphdr->saddr.ip = iph->saddr;
107 iphdr->daddr.ip = iph->daddr;
108 }
109
110 return 1;
111}
112
113static inline int
114ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
115 bool inverse, struct ip_vs_iphdr *iphdr)
116{
117 int hdr_flags = IP_VS_HDR_ICMP;
118
119 if (inverse)
120 hdr_flags |= IP_VS_HDR_INVERSE;
121
122 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
123}
124
125static inline int
126ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
127 struct ip_vs_iphdr *iphdr)
128{
129 int hdr_flags = 0;
130
131 if (inverse)
132 hdr_flags |= IP_VS_HDR_INVERSE;
133
134 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
135 hdr_flags, iphdr);
136}
137
138static inline bool
139ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
140{
141 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
142}
143
144static inline bool
145ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
146{
147 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
148}
149
150static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
151 const union nf_inet_addr *src)
152{
153#ifdef CONFIG_IP_VS_IPV6
154 if (af == AF_INET6)
155 dst->in6 = src->in6;
156 else
157#endif
158 dst->ip = src->ip;
159}
160
161static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
162 const union nf_inet_addr *src)
163{
164#ifdef CONFIG_IP_VS_IPV6
165 if (af == AF_INET6) {
166 dst->in6 = src->in6;
167 return;
168 }
169#endif
170 dst->ip = src->ip;
171 dst->all[1] = 0;
172 dst->all[2] = 0;
173 dst->all[3] = 0;
174}
175
176static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
177 const union nf_inet_addr *b)
178{
179#ifdef CONFIG_IP_VS_IPV6
180 if (af == AF_INET6)
181 return ipv6_addr_equal(&a->in6, &b->in6);
182#endif
183 return a->ip == b->ip;
184}
185
186#ifdef CONFIG_IP_VS_DEBUG
187#include <linux/net.h>
188
189int ip_vs_get_debug_level(void);
190
191static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
192 const union nf_inet_addr *addr,
193 int *idx)
194{
195 int len;
196#ifdef CONFIG_IP_VS_IPV6
197 if (af == AF_INET6)
198 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
199 &addr->in6) + 1;
200 else
201#endif
202 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
203 &addr->ip) + 1;
204
205 *idx += len;
206 BUG_ON(*idx > buf_len + 1);
207 return &buf[*idx - len];
208}
209
210#define IP_VS_DBG_BUF(level, msg, ...) \
211 do { \
212 char ip_vs_dbg_buf[160]; \
213 int ip_vs_dbg_idx = 0; \
214 if (level <= ip_vs_get_debug_level()) \
215 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
216 } while (0)
217#define IP_VS_ERR_BUF(msg...) \
218 do { \
219 char ip_vs_dbg_buf[160]; \
220 int ip_vs_dbg_idx = 0; \
221 pr_err(msg); \
222 } while (0)
223
224/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
225#define IP_VS_DBG_ADDR(af, addr) \
226 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
227 sizeof(ip_vs_dbg_buf), addr, \
228 &ip_vs_dbg_idx)
229
230#define IP_VS_DBG(level, msg, ...) \
231 do { \
232 if (level <= ip_vs_get_debug_level()) \
233 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
234 } while (0)
235#define IP_VS_DBG_RL(msg, ...) \
236 do { \
237 if (net_ratelimit()) \
238 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
239 } while (0)
240#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
241 do { \
242 if (level <= ip_vs_get_debug_level()) \
243 pp->debug_packet(af, pp, skb, ofs, msg); \
244 } while (0)
245#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
246 do { \
247 if (level <= ip_vs_get_debug_level() && \
248 net_ratelimit()) \
249 pp->debug_packet(af, pp, skb, ofs, msg); \
250 } while (0)
251#else /* NO DEBUGGING at ALL */
252#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
253#define IP_VS_ERR_BUF(msg...) do {} while (0)
254#define IP_VS_DBG(level, msg...) do {} while (0)
255#define IP_VS_DBG_RL(msg...) do {} while (0)
256#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
257#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
258#endif
259
260#define IP_VS_BUG() BUG()
261#define IP_VS_ERR_RL(msg, ...) \
262 do { \
263 if (net_ratelimit()) \
264 pr_err(msg, ##__VA_ARGS__); \
265 } while (0)
266
267#ifdef CONFIG_IP_VS_DEBUG
268#define EnterFunction(level) \
269 do { \
270 if (level <= ip_vs_get_debug_level()) \
271 printk(KERN_DEBUG \
272 pr_fmt("Enter: %s, %s line %i\n"), \
273 __func__, __FILE__, __LINE__); \
274 } while (0)
275#define LeaveFunction(level) \
276 do { \
277 if (level <= ip_vs_get_debug_level()) \
278 printk(KERN_DEBUG \
279 pr_fmt("Leave: %s, %s line %i\n"), \
280 __func__, __FILE__, __LINE__); \
281 } while (0)
282#else
283#define EnterFunction(level) do {} while (0)
284#define LeaveFunction(level) do {} while (0)
285#endif
286
287/* The port number of FTP service (in network order). */
288#define FTPPORT cpu_to_be16(21)
289#define FTPDATA cpu_to_be16(20)
290
291/* TCP State Values */
292enum {
293 IP_VS_TCP_S_NONE = 0,
294 IP_VS_TCP_S_ESTABLISHED,
295 IP_VS_TCP_S_SYN_SENT,
296 IP_VS_TCP_S_SYN_RECV,
297 IP_VS_TCP_S_FIN_WAIT,
298 IP_VS_TCP_S_TIME_WAIT,
299 IP_VS_TCP_S_CLOSE,
300 IP_VS_TCP_S_CLOSE_WAIT,
301 IP_VS_TCP_S_LAST_ACK,
302 IP_VS_TCP_S_LISTEN,
303 IP_VS_TCP_S_SYNACK,
304 IP_VS_TCP_S_LAST
305};
306
307/* UDP State Values */
308enum {
309 IP_VS_UDP_S_NORMAL,
310 IP_VS_UDP_S_LAST,
311};
312
313/* ICMP State Values */
314enum {
315 IP_VS_ICMP_S_NORMAL,
316 IP_VS_ICMP_S_LAST,
317};
318
319/* SCTP State Values */
320enum ip_vs_sctp_states {
321 IP_VS_SCTP_S_NONE,
322 IP_VS_SCTP_S_INIT1,
323 IP_VS_SCTP_S_INIT,
324 IP_VS_SCTP_S_COOKIE_SENT,
325 IP_VS_SCTP_S_COOKIE_REPLIED,
326 IP_VS_SCTP_S_COOKIE_WAIT,
327 IP_VS_SCTP_S_COOKIE,
328 IP_VS_SCTP_S_COOKIE_ECHOED,
329 IP_VS_SCTP_S_ESTABLISHED,
330 IP_VS_SCTP_S_SHUTDOWN_SENT,
331 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
332 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
333 IP_VS_SCTP_S_REJECTED,
334 IP_VS_SCTP_S_CLOSED,
335 IP_VS_SCTP_S_LAST
336};
337
338/* Connection templates use bits from state */
339#define IP_VS_CTPL_S_NONE 0x0000
340#define IP_VS_CTPL_S_ASSURED 0x0001
341#define IP_VS_CTPL_S_LAST 0x0002
342
343/* Delta sequence info structure
344 * Each ip_vs_conn has 2 (output AND input seq. changes).
345 * Only used in the VS/NAT.
346 */
347struct ip_vs_seq {
348 __u32 init_seq; /* Add delta from this seq */
349 __u32 delta; /* Delta in sequence numbers */
350 __u32 previous_delta; /* Delta in sequence numbers
351 * before last resized pkt */
352};
353
354/* counters per cpu */
355struct ip_vs_counters {
356 __u64 conns; /* connections scheduled */
357 __u64 inpkts; /* incoming packets */
358 __u64 outpkts; /* outgoing packets */
359 __u64 inbytes; /* incoming bytes */
360 __u64 outbytes; /* outgoing bytes */
361};
362/* Stats per cpu */
363struct ip_vs_cpu_stats {
364 struct ip_vs_counters cnt;
365 struct u64_stats_sync syncp;
366};
367
368/* IPVS statistics objects */
369struct ip_vs_estimator {
370 struct list_head list;
371
372 u64 last_inbytes;
373 u64 last_outbytes;
374 u64 last_conns;
375 u64 last_inpkts;
376 u64 last_outpkts;
377
378 u64 cps;
379 u64 inpps;
380 u64 outpps;
381 u64 inbps;
382 u64 outbps;
383};
384
385/*
386 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
387 */
388struct ip_vs_kstats {
389 u64 conns; /* connections scheduled */
390 u64 inpkts; /* incoming packets */
391 u64 outpkts; /* outgoing packets */
392 u64 inbytes; /* incoming bytes */
393 u64 outbytes; /* outgoing bytes */
394
395 u64 cps; /* current connection rate */
396 u64 inpps; /* current in packet rate */
397 u64 outpps; /* current out packet rate */
398 u64 inbps; /* current in byte rate */
399 u64 outbps; /* current out byte rate */
400};
401
402struct ip_vs_stats {
403 struct ip_vs_kstats kstats; /* kernel statistics */
404 struct ip_vs_estimator est; /* estimator */
405 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
406 spinlock_t lock; /* spin lock */
407 struct ip_vs_kstats kstats0; /* reset values */
408};
409
410struct dst_entry;
411struct iphdr;
412struct ip_vs_conn;
413struct ip_vs_app;
414struct sk_buff;
415struct ip_vs_proto_data;
416
417struct ip_vs_protocol {
418 struct ip_vs_protocol *next;
419 char *name;
420 u16 protocol;
421 u16 num_states;
422 int dont_defrag;
423
424 void (*init)(struct ip_vs_protocol *pp);
425
426 void (*exit)(struct ip_vs_protocol *pp);
427
428 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
429
430 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
431
432 int (*conn_schedule)(struct netns_ipvs *ipvs,
433 int af, struct sk_buff *skb,
434 struct ip_vs_proto_data *pd,
435 int *verdict, struct ip_vs_conn **cpp,
436 struct ip_vs_iphdr *iph);
437
438 struct ip_vs_conn *
439 (*conn_in_get)(struct netns_ipvs *ipvs,
440 int af,
441 const struct sk_buff *skb,
442 const struct ip_vs_iphdr *iph);
443
444 struct ip_vs_conn *
445 (*conn_out_get)(struct netns_ipvs *ipvs,
446 int af,
447 const struct sk_buff *skb,
448 const struct ip_vs_iphdr *iph);
449
450 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
451 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
452
453 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
454 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
455
456 const char *(*state_name)(int state);
457
458 void (*state_transition)(struct ip_vs_conn *cp, int direction,
459 const struct sk_buff *skb,
460 struct ip_vs_proto_data *pd);
461
462 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
463
464 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
465
466 int (*app_conn_bind)(struct ip_vs_conn *cp);
467
468 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
469 const struct sk_buff *skb,
470 int offset,
471 const char *msg);
472
473 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
474};
475
476/* protocol data per netns */
477struct ip_vs_proto_data {
478 struct ip_vs_proto_data *next;
479 struct ip_vs_protocol *pp;
480 int *timeout_table; /* protocol timeout table */
481 atomic_t appcnt; /* counter of proto app incs. */
482 struct tcp_states_t *tcp_state_table;
483};
484
485struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
486struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
487 unsigned short proto);
488
489struct ip_vs_conn_param {
490 struct netns_ipvs *ipvs;
491 const union nf_inet_addr *caddr;
492 const union nf_inet_addr *vaddr;
493 __be16 cport;
494 __be16 vport;
495 __u16 protocol;
496 u16 af;
497
498 const struct ip_vs_pe *pe;
499 char *pe_data;
500 __u8 pe_data_len;
501};
502
503/* IP_VS structure allocated for each dynamically scheduled connection */
504struct ip_vs_conn {
505 struct hlist_node c_list; /* hashed list heads */
506 /* Protocol, addresses and port numbers */
507 __be16 cport;
508 __be16 dport;
509 __be16 vport;
510 u16 af; /* address family */
511 union nf_inet_addr caddr; /* client address */
512 union nf_inet_addr vaddr; /* virtual address */
513 union nf_inet_addr daddr; /* destination address */
514 volatile __u32 flags; /* status flags */
515 __u16 protocol; /* Which protocol (TCP/UDP) */
516 __u16 daf; /* Address family of the dest */
517 struct netns_ipvs *ipvs;
518
519 /* counter and timer */
520 refcount_t refcnt; /* reference count */
521 struct timer_list timer; /* Expiration timer */
522 volatile unsigned long timeout; /* timeout */
523
524 /* Flags and state transition */
525 spinlock_t lock; /* lock for state transition */
526 volatile __u16 state; /* state info */
527 volatile __u16 old_state; /* old state, to be used for
528 * state transition triggerd
529 * synchronization
530 */
531 __u32 fwmark; /* Fire wall mark from skb */
532 unsigned long sync_endtime; /* jiffies + sent_retries */
533
534 /* Control members */
535 struct ip_vs_conn *control; /* Master control connection */
536 atomic_t n_control; /* Number of controlled ones */
537 struct ip_vs_dest *dest; /* real server */
538 atomic_t in_pkts; /* incoming packet counter */
539
540 /* Packet transmitter for different forwarding methods. If it
541 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
542 * otherwise this must be changed to a sk_buff **.
543 * NF_ACCEPT can be returned when destination is local.
544 */
545 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
546 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
547
548 /* Note: we can group the following members into a structure,
549 * in order to save more space, and the following members are
550 * only used in VS/NAT anyway
551 */
552 struct ip_vs_app *app; /* bound ip_vs_app object */
553 void *app_data; /* Application private data */
554 struct ip_vs_seq in_seq; /* incoming seq. struct */
555 struct ip_vs_seq out_seq; /* outgoing seq. struct */
556
557 const struct ip_vs_pe *pe;
558 char *pe_data;
559 __u8 pe_data_len;
560
561 struct rcu_head rcu_head;
562};
563
564/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
565 * for IPv6 support.
566 *
567 * We need these to conveniently pass around service and destination
568 * options, but unfortunately, we also need to keep the old definitions to
569 * maintain userspace backwards compatibility for the setsockopt interface.
570 */
571struct ip_vs_service_user_kern {
572 /* virtual service addresses */
573 u16 af;
574 u16 protocol;
575 union nf_inet_addr addr; /* virtual ip address */
576 __be16 port;
577 u32 fwmark; /* firwall mark of service */
578
579 /* virtual service options */
580 char *sched_name;
581 char *pe_name;
582 unsigned int flags; /* virtual service flags */
583 unsigned int timeout; /* persistent timeout in sec */
584 __be32 netmask; /* persistent netmask or plen */
585};
586
587
588struct ip_vs_dest_user_kern {
589 /* destination server address */
590 union nf_inet_addr addr;
591 __be16 port;
592
593 /* real server options */
594 unsigned int conn_flags; /* connection flags */
595 int weight; /* destination weight */
596
597 /* thresholds for active connections */
598 u32 u_threshold; /* upper threshold */
599 u32 l_threshold; /* lower threshold */
600
601 /* Address family of addr */
602 u16 af;
603
604 u16 tun_type; /* tunnel type */
605 __be16 tun_port; /* tunnel port */
606 u16 tun_flags; /* tunnel flags */
607};
608
609
610/*
611 * The information about the virtual service offered to the net and the
612 * forwarding entries.
613 */
614struct ip_vs_service {
615 struct hlist_node s_list; /* for normal service table */
616 struct hlist_node f_list; /* for fwmark-based service table */
617 atomic_t refcnt; /* reference counter */
618
619 u16 af; /* address family */
620 __u16 protocol; /* which protocol (TCP/UDP) */
621 union nf_inet_addr addr; /* IP address for virtual service */
622 __be16 port; /* port number for the service */
623 __u32 fwmark; /* firewall mark of the service */
624 unsigned int flags; /* service status flags */
625 unsigned int timeout; /* persistent timeout in ticks */
626 __be32 netmask; /* grouping granularity, mask/plen */
627 struct netns_ipvs *ipvs;
628
629 struct list_head destinations; /* real server d-linked list */
630 __u32 num_dests; /* number of servers */
631 struct ip_vs_stats stats; /* statistics for the service */
632
633 /* for scheduling */
634 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
635 spinlock_t sched_lock; /* lock sched_data */
636 void *sched_data; /* scheduler application data */
637
638 /* alternate persistence engine */
639 struct ip_vs_pe __rcu *pe;
640 int conntrack_afmask;
641
642 struct rcu_head rcu_head;
643};
644
645/* Information for cached dst */
646struct ip_vs_dest_dst {
647 struct dst_entry *dst_cache; /* destination cache entry */
648 u32 dst_cookie;
649 union nf_inet_addr dst_saddr;
650 struct rcu_head rcu_head;
651};
652
653/* The real server destination forwarding entry with ip address, port number,
654 * and so on.
655 */
656struct ip_vs_dest {
657 struct list_head n_list; /* for the dests in the service */
658 struct hlist_node d_list; /* for table with all the dests */
659
660 u16 af; /* address family */
661 __be16 port; /* port number of the server */
662 union nf_inet_addr addr; /* IP address of the server */
663 volatile unsigned int flags; /* dest status flags */
664 atomic_t conn_flags; /* flags to copy to conn */
665 atomic_t weight; /* server weight */
666 atomic_t last_weight; /* server latest weight */
667 __u16 tun_type; /* tunnel type */
668 __be16 tun_port; /* tunnel port */
669 __u16 tun_flags; /* tunnel flags */
670
671 refcount_t refcnt; /* reference counter */
672 struct ip_vs_stats stats; /* statistics */
673 unsigned long idle_start; /* start time, jiffies */
674
675 /* connection counters and thresholds */
676 atomic_t activeconns; /* active connections */
677 atomic_t inactconns; /* inactive connections */
678 atomic_t persistconns; /* persistent connections */
679 __u32 u_threshold; /* upper threshold */
680 __u32 l_threshold; /* lower threshold */
681
682 /* for destination cache */
683 spinlock_t dst_lock; /* lock of dst_cache */
684 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
685
686 /* for virtual service */
687 struct ip_vs_service __rcu *svc; /* service it belongs to */
688 __u16 protocol; /* which protocol (TCP/UDP) */
689 __be16 vport; /* virtual port number */
690 union nf_inet_addr vaddr; /* virtual IP address */
691 __u32 vfwmark; /* firewall mark of service */
692
693 struct list_head t_list; /* in dest_trash */
694 unsigned int in_rs_table:1; /* we are in rs_table */
695};
696
697/* The scheduler object */
698struct ip_vs_scheduler {
699 struct list_head n_list; /* d-linked list head */
700 char *name; /* scheduler name */
701 atomic_t refcnt; /* reference counter */
702 struct module *module; /* THIS_MODULE/NULL */
703
704 /* scheduler initializing service */
705 int (*init_service)(struct ip_vs_service *svc);
706 /* scheduling service finish */
707 void (*done_service)(struct ip_vs_service *svc);
708 /* dest is linked */
709 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is unlinked */
711 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712 /* dest is updated */
713 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
714
715 /* selecting a server from the given service */
716 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
717 const struct sk_buff *skb,
718 struct ip_vs_iphdr *iph);
719};
720
721/* The persistence engine object */
722struct ip_vs_pe {
723 struct list_head n_list; /* d-linked list head */
724 char *name; /* scheduler name */
725 atomic_t refcnt; /* reference counter */
726 struct module *module; /* THIS_MODULE/NULL */
727
728 /* get the connection template, if any */
729 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
730 bool (*ct_match)(const struct ip_vs_conn_param *p,
731 struct ip_vs_conn *ct);
732 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
733 bool inverse);
734 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
735 /* create connections for real-server outgoing packets */
736 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
737 struct ip_vs_dest *dest,
738 struct sk_buff *skb,
739 const struct ip_vs_iphdr *iph,
740 __be16 dport, __be16 cport);
741};
742
743/* The application module object (a.k.a. app incarnation) */
744struct ip_vs_app {
745 struct list_head a_list; /* member in app list */
746 int type; /* IP_VS_APP_TYPE_xxx */
747 char *name; /* application module name */
748 __u16 protocol;
749 struct module *module; /* THIS_MODULE/NULL */
750 struct list_head incs_list; /* list of incarnations */
751
752 /* members for application incarnations */
753 struct list_head p_list; /* member in proto app list */
754 struct ip_vs_app *app; /* its real application */
755 __be16 port; /* port number in net order */
756 atomic_t usecnt; /* usage counter */
757 struct rcu_head rcu_head;
758
759 /* output hook: Process packet in inout 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_out)(struct ip_vs_app *, struct ip_vs_conn *,
764 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
765
766 /* input hook: Process packet in outin direction, diff set for TCP.
767 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
768 * 2=Mangled but checksum was not updated
769 */
770 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
771 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
772
773 /* ip_vs_app initializer */
774 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
775
776 /* ip_vs_app finish */
777 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
778
779
780 /* not used now */
781 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
782 struct ip_vs_protocol *);
783
784 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
785
786 int * timeout_table;
787 int * timeouts;
788 int timeouts_size;
789
790 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
791 int *verdict, struct ip_vs_conn **cpp);
792
793 struct ip_vs_conn *
794 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
795 const struct iphdr *iph, int inverse);
796
797 struct ip_vs_conn *
798 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
799 const struct iphdr *iph, int inverse);
800
801 int (*state_transition)(struct ip_vs_conn *cp, int direction,
802 const struct sk_buff *skb,
803 struct ip_vs_app *app);
804
805 void (*timeout_change)(struct ip_vs_app *app, int flags);
806};
807
808struct ipvs_master_sync_state {
809 struct list_head sync_queue;
810 struct ip_vs_sync_buff *sync_buff;
811 unsigned long sync_queue_len;
812 unsigned int sync_queue_delay;
813 struct delayed_work master_wakeup_work;
814 struct netns_ipvs *ipvs;
815};
816
817struct ip_vs_sync_thread_data;
818
819/* How much time to keep dests in trash */
820#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
821
822struct ipvs_sync_daemon_cfg {
823 union nf_inet_addr mcast_group;
824 int syncid;
825 u16 sync_maxlen;
826 u16 mcast_port;
827 u8 mcast_af;
828 u8 mcast_ttl;
829 /* multicast interface name */
830 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
831};
832
833/* IPVS in network namespace */
834struct netns_ipvs {
835 int gen; /* Generation */
836 int enable; /* enable like nf_hooks do */
837 /* Hash table: for real service lookups */
838 #define IP_VS_RTAB_BITS 4
839 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
840 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
841
842 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
843 /* ip_vs_app */
844 struct list_head app_list;
845 /* ip_vs_proto */
846 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
847 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
848 /* ip_vs_proto_tcp */
849#ifdef CONFIG_IP_VS_PROTO_TCP
850 #define TCP_APP_TAB_BITS 4
851 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
852 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
853 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
854#endif
855 /* ip_vs_proto_udp */
856#ifdef CONFIG_IP_VS_PROTO_UDP
857 #define UDP_APP_TAB_BITS 4
858 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
859 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
860 struct list_head udp_apps[UDP_APP_TAB_SIZE];
861#endif
862 /* ip_vs_proto_sctp */
863#ifdef CONFIG_IP_VS_PROTO_SCTP
864 #define SCTP_APP_TAB_BITS 4
865 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
866 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
867 /* Hash table for SCTP application incarnations */
868 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
869#endif
870 /* ip_vs_conn */
871 atomic_t conn_count; /* connection counter */
872
873 /* ip_vs_ctl */
874 struct ip_vs_stats tot_stats; /* Statistics & est. */
875
876 int num_services; /* no of virtual services */
877
878 /* Trash for destinations */
879 struct list_head dest_trash;
880 spinlock_t dest_trash_lock;
881 struct timer_list dest_trash_timer; /* expiration timer */
882 /* Service counters */
883 atomic_t ftpsvc_counter;
884 atomic_t nullsvc_counter;
885 atomic_t conn_out_counter;
886
887#ifdef CONFIG_SYSCTL
888 /* 1/rate drop and drop-entry variables */
889 struct delayed_work defense_work; /* Work handler */
890 int drop_rate;
891 int drop_counter;
892 int old_secure_tcp;
893 atomic_t dropentry;
894 /* locks in ctl.c */
895 spinlock_t dropentry_lock; /* drop entry handling */
896 spinlock_t droppacket_lock; /* drop packet handling */
897 spinlock_t securetcp_lock; /* state and timeout tables */
898
899 /* sys-ctl struct */
900 struct ctl_table_header *sysctl_hdr;
901 struct ctl_table *sysctl_tbl;
902#endif
903
904 /* sysctl variables */
905 int sysctl_amemthresh;
906 int sysctl_am_droprate;
907 int sysctl_drop_entry;
908 int sysctl_drop_packet;
909 int sysctl_secure_tcp;
910#ifdef CONFIG_IP_VS_NFCT
911 int sysctl_conntrack;
912#endif
913 int sysctl_snat_reroute;
914 int sysctl_sync_ver;
915 int sysctl_sync_ports;
916 int sysctl_sync_persist_mode;
917 unsigned long sysctl_sync_qlen_max;
918 int sysctl_sync_sock_size;
919 int sysctl_cache_bypass;
920 int sysctl_expire_nodest_conn;
921 int sysctl_sloppy_tcp;
922 int sysctl_sloppy_sctp;
923 int sysctl_expire_quiescent_template;
924 int sysctl_sync_threshold[2];
925 unsigned int sysctl_sync_refresh_period;
926 int sysctl_sync_retries;
927 int sysctl_nat_icmp_send;
928 int sysctl_pmtu_disc;
929 int sysctl_backup_only;
930 int sysctl_conn_reuse_mode;
931 int sysctl_schedule_icmp;
932 int sysctl_ignore_tunneled;
933
934 /* ip_vs_lblc */
935 int sysctl_lblc_expiration;
936 struct ctl_table_header *lblc_ctl_header;
937 struct ctl_table *lblc_ctl_table;
938 /* ip_vs_lblcr */
939 int sysctl_lblcr_expiration;
940 struct ctl_table_header *lblcr_ctl_header;
941 struct ctl_table *lblcr_ctl_table;
942 /* ip_vs_est */
943 struct list_head est_list; /* estimator list */
944 spinlock_t est_lock;
945 struct timer_list est_timer; /* Estimation timer */
946 /* ip_vs_sync */
947 spinlock_t sync_lock;
948 struct ipvs_master_sync_state *ms;
949 spinlock_t sync_buff_lock;
950 struct ip_vs_sync_thread_data *master_tinfo;
951 struct ip_vs_sync_thread_data *backup_tinfo;
952 int threads_mask;
953 volatile int sync_state;
954 struct mutex sync_mutex;
955 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
956 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
957 /* net name space ptr */
958 struct net *net; /* Needed by timer routines */
959 /* Number of heterogeneous destinations, needed becaus heterogeneous
960 * are not supported when synchronization is enabled.
961 */
962 unsigned int mixed_address_family_dests;
963};
964
965#define DEFAULT_SYNC_THRESHOLD 3
966#define DEFAULT_SYNC_PERIOD 50
967#define DEFAULT_SYNC_VER 1
968#define DEFAULT_SLOPPY_TCP 0
969#define DEFAULT_SLOPPY_SCTP 0
970#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
971#define DEFAULT_SYNC_RETRIES 0
972#define IPVS_SYNC_WAKEUP_RATE 8
973#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
974#define IPVS_SYNC_SEND_DELAY (HZ / 50)
975#define IPVS_SYNC_CHECK_PERIOD HZ
976#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
977#define IPVS_SYNC_PORTS_MAX (1 << 6)
978
979#ifdef CONFIG_SYSCTL
980
981static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
982{
983 return ipvs->sysctl_sync_threshold[0];
984}
985
986static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
987{
988 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
989}
990
991static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
992{
993 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
994}
995
996static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
997{
998 return ipvs->sysctl_sync_retries;
999}
1000
1001static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1002{
1003 return ipvs->sysctl_sync_ver;
1004}
1005
1006static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1007{
1008 return ipvs->sysctl_sloppy_tcp;
1009}
1010
1011static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1012{
1013 return ipvs->sysctl_sloppy_sctp;
1014}
1015
1016static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1017{
1018 return READ_ONCE(ipvs->sysctl_sync_ports);
1019}
1020
1021static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1022{
1023 return ipvs->sysctl_sync_persist_mode;
1024}
1025
1026static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1027{
1028 return ipvs->sysctl_sync_qlen_max;
1029}
1030
1031static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1032{
1033 return ipvs->sysctl_sync_sock_size;
1034}
1035
1036static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1037{
1038 return ipvs->sysctl_pmtu_disc;
1039}
1040
1041static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1042{
1043 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1044 ipvs->sysctl_backup_only;
1045}
1046
1047static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1048{
1049 return ipvs->sysctl_conn_reuse_mode;
1050}
1051
1052static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1053{
1054 return ipvs->sysctl_schedule_icmp;
1055}
1056
1057static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1058{
1059 return ipvs->sysctl_ignore_tunneled;
1060}
1061
1062static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1063{
1064 return ipvs->sysctl_cache_bypass;
1065}
1066
1067#else
1068
1069static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1070{
1071 return DEFAULT_SYNC_THRESHOLD;
1072}
1073
1074static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1075{
1076 return DEFAULT_SYNC_PERIOD;
1077}
1078
1079static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1080{
1081 return DEFAULT_SYNC_REFRESH_PERIOD;
1082}
1083
1084static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1085{
1086 return DEFAULT_SYNC_RETRIES & 3;
1087}
1088
1089static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1090{
1091 return DEFAULT_SYNC_VER;
1092}
1093
1094static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1095{
1096 return DEFAULT_SLOPPY_TCP;
1097}
1098
1099static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1100{
1101 return DEFAULT_SLOPPY_SCTP;
1102}
1103
1104static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1105{
1106 return 1;
1107}
1108
1109static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1110{
1111 return 0;
1112}
1113
1114static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1115{
1116 return IPVS_SYNC_QLEN_MAX;
1117}
1118
1119static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1120{
1121 return 0;
1122}
1123
1124static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1125{
1126 return 1;
1127}
1128
1129static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1130{
1131 return 0;
1132}
1133
1134static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1135{
1136 return 1;
1137}
1138
1139static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1140{
1141 return 0;
1142}
1143
1144static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1145{
1146 return 0;
1147}
1148
1149static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1150{
1151 return 0;
1152}
1153
1154#endif
1155
1156/* IPVS core functions
1157 * (from ip_vs_core.c)
1158 */
1159const char *ip_vs_proto_name(unsigned int proto);
1160void ip_vs_init_hash_table(struct list_head *table, int rows);
1161struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1162 struct ip_vs_dest *dest,
1163 struct sk_buff *skb,
1164 const struct ip_vs_iphdr *iph,
1165 __be16 dport,
1166 __be16 cport);
1167#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1168
1169#define IP_VS_APP_TYPE_FTP 1
1170
1171/* ip_vs_conn handling functions
1172 * (from ip_vs_conn.c)
1173 */
1174enum {
1175 IP_VS_DIR_INPUT = 0,
1176 IP_VS_DIR_OUTPUT,
1177 IP_VS_DIR_INPUT_ONLY,
1178 IP_VS_DIR_LAST,
1179};
1180
1181static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1182 const union nf_inet_addr *caddr,
1183 __be16 cport,
1184 const union nf_inet_addr *vaddr,
1185 __be16 vport,
1186 struct ip_vs_conn_param *p)
1187{
1188 p->ipvs = ipvs;
1189 p->af = af;
1190 p->protocol = protocol;
1191 p->caddr = caddr;
1192 p->cport = cport;
1193 p->vaddr = vaddr;
1194 p->vport = vport;
1195 p->pe = NULL;
1196 p->pe_data = NULL;
1197}
1198
1199struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1200struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1201
1202struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1203 const struct sk_buff *skb,
1204 const struct ip_vs_iphdr *iph);
1205
1206struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1207
1208struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1209 const struct sk_buff *skb,
1210 const struct ip_vs_iphdr *iph);
1211
1212/* Get reference to gain full access to conn.
1213 * By default, RCU read-side critical sections have access only to
1214 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1215 */
1216static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1217{
1218 return refcount_inc_not_zero(&cp->refcnt);
1219}
1220
1221/* put back the conn without restarting its timer */
1222static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1223{
1224 smp_mb__before_atomic();
1225 refcount_dec(&cp->refcnt);
1226}
1227void ip_vs_conn_put(struct ip_vs_conn *cp);
1228void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1229
1230struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1231 const union nf_inet_addr *daddr,
1232 __be16 dport, unsigned int flags,
1233 struct ip_vs_dest *dest, __u32 fwmark);
1234void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1235
1236const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1237
1238void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1239int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1240void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1241int ip_vs_conn_init(void);
1242void ip_vs_conn_cleanup(void);
1243
1244static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1245{
1246 struct ip_vs_conn *ctl_cp = cp->control;
1247 if (!ctl_cp) {
1248 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1249 "%s:%d to %s:%d\n",
1250 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1251 ntohs(cp->cport),
1252 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1253 ntohs(cp->vport));
1254
1255 return;
1256 }
1257
1258 IP_VS_DBG_BUF(7, "DELeting control for: "
1259 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1260 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1261 ntohs(cp->cport),
1262 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1263 ntohs(ctl_cp->cport));
1264
1265 cp->control = NULL;
1266 if (atomic_read(&ctl_cp->n_control) == 0) {
1267 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1268 "%s:%d to %s:%d\n",
1269 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1270 ntohs(cp->cport),
1271 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1272 ntohs(cp->vport));
1273
1274 return;
1275 }
1276 atomic_dec(&ctl_cp->n_control);
1277}
1278
1279static inline void
1280ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1281{
1282 if (cp->control) {
1283 IP_VS_ERR_BUF("request control ADD for already controlled: "
1284 "%s:%d to %s:%d\n",
1285 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1286 ntohs(cp->cport),
1287 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1288 ntohs(cp->vport));
1289
1290 ip_vs_control_del(cp);
1291 }
1292
1293 IP_VS_DBG_BUF(7, "ADDing control for: "
1294 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1295 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1296 ntohs(cp->cport),
1297 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1298 ntohs(ctl_cp->cport));
1299
1300 cp->control = ctl_cp;
1301 atomic_inc(&ctl_cp->n_control);
1302}
1303
1304/* Mark our template as assured */
1305static inline void
1306ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1307{
1308 struct ip_vs_conn *ct = cp->control;
1309
1310 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1311 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1312 ct->state |= IP_VS_CTPL_S_ASSURED;
1313}
1314
1315/* IPVS netns init & cleanup functions */
1316int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1317int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1318int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1319int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1320int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1321int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1322void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1323void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1324void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1325void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1326void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1327void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1328void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1329
1330/* IPVS application functions
1331 * (from ip_vs_app.c)
1332 */
1333#define IP_VS_APP_MAX_PORTS 8
1334struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1335void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1336int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1337void ip_vs_unbind_app(struct ip_vs_conn *cp);
1338int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1339 __u16 port);
1340int ip_vs_app_inc_get(struct ip_vs_app *inc);
1341void ip_vs_app_inc_put(struct ip_vs_app *inc);
1342
1343int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1344 struct ip_vs_iphdr *ipvsh);
1345int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1346 struct ip_vs_iphdr *ipvsh);
1347
1348int register_ip_vs_pe(struct ip_vs_pe *pe);
1349int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1350struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1351struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1352
1353/* Use a #define to avoid all of module.h just for these trivial ops */
1354#define ip_vs_pe_get(pe) \
1355 if (pe && pe->module) \
1356 __module_get(pe->module);
1357
1358#define ip_vs_pe_put(pe) \
1359 if (pe && pe->module) \
1360 module_put(pe->module);
1361
1362/* IPVS protocol functions (from ip_vs_proto.c) */
1363int ip_vs_protocol_init(void);
1364void ip_vs_protocol_cleanup(void);
1365void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1366int *ip_vs_create_timeout_table(int *table, int size);
1367void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1368 const struct sk_buff *skb, int offset,
1369 const char *msg);
1370
1371extern struct ip_vs_protocol ip_vs_protocol_tcp;
1372extern struct ip_vs_protocol ip_vs_protocol_udp;
1373extern struct ip_vs_protocol ip_vs_protocol_icmp;
1374extern struct ip_vs_protocol ip_vs_protocol_esp;
1375extern struct ip_vs_protocol ip_vs_protocol_ah;
1376extern struct ip_vs_protocol ip_vs_protocol_sctp;
1377
1378/* Registering/unregistering scheduler functions
1379 * (from ip_vs_sched.c)
1380 */
1381int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1382int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1383int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1384 struct ip_vs_scheduler *scheduler);
1385void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1386 struct ip_vs_scheduler *sched);
1387struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1388void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1389struct ip_vs_conn *
1390ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1391 struct ip_vs_proto_data *pd, int *ignored,
1392 struct ip_vs_iphdr *iph);
1393int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1394 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1395
1396void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1397
1398/* IPVS control data and functions (from ip_vs_ctl.c) */
1399extern struct ip_vs_stats ip_vs_stats;
1400extern int sysctl_ip_vs_sync_ver;
1401
1402struct ip_vs_service *
1403ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1404 const union nf_inet_addr *vaddr, __be16 vport);
1405
1406bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1407 const union nf_inet_addr *daddr, __be16 dport);
1408
1409struct ip_vs_dest *
1410ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1411 const union nf_inet_addr *daddr, __be16 dport);
1412struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1413 const union nf_inet_addr *daddr,
1414 __be16 tun_port);
1415
1416int ip_vs_use_count_inc(void);
1417void ip_vs_use_count_dec(void);
1418int ip_vs_register_nl_ioctl(void);
1419void ip_vs_unregister_nl_ioctl(void);
1420int ip_vs_control_init(void);
1421void ip_vs_control_cleanup(void);
1422struct ip_vs_dest *
1423ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1424 const union nf_inet_addr *daddr, __be16 dport,
1425 const union nf_inet_addr *vaddr, __be16 vport,
1426 __u16 protocol, __u32 fwmark, __u32 flags);
1427void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1428
1429static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1430{
1431 refcount_inc(&dest->refcnt);
1432}
1433
1434static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1435{
1436 smp_mb__before_atomic();
1437 refcount_dec(&dest->refcnt);
1438}
1439
1440static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1441{
1442 if (refcount_dec_and_test(&dest->refcnt))
1443 kfree(dest);
1444}
1445
1446/* IPVS sync daemon data and function prototypes
1447 * (from ip_vs_sync.c)
1448 */
1449int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1450 int state);
1451int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1452void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1453
1454/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1455void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1456void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1457void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1458void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1459
1460/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1461int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1462 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1464 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1466 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1467int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1468 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1469int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1470 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1471int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1472 struct ip_vs_protocol *pp, int offset,
1473 unsigned int hooknum, struct ip_vs_iphdr *iph);
1474void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1475
1476#ifdef CONFIG_IP_VS_IPV6
1477int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1478 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1485int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1486 struct ip_vs_protocol *pp, int offset,
1487 unsigned int hooknum, struct ip_vs_iphdr *iph);
1488#endif
1489
1490#ifdef CONFIG_SYSCTL
1491/* This is a simple mechanism to ignore packets when
1492 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1493 * we start to drop 1/rate of the packets
1494 */
1495static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1496{
1497 if (!ipvs->drop_rate)
1498 return 0;
1499 if (--ipvs->drop_counter > 0)
1500 return 0;
1501 ipvs->drop_counter = ipvs->drop_rate;
1502 return 1;
1503}
1504#else
1505static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1506#endif
1507
1508#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1509 IP_VS_CONN_F_FWD_MASK)
1510
1511/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1512#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1513
1514static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1515{
1516 char fwd;
1517
1518 switch (IP_VS_FWD_METHOD(cp)) {
1519 case IP_VS_CONN_F_MASQ:
1520 fwd = 'M'; break;
1521 case IP_VS_CONN_F_LOCALNODE:
1522 fwd = 'L'; break;
1523 case IP_VS_CONN_F_TUNNEL:
1524 fwd = 'T'; break;
1525 case IP_VS_CONN_F_DROUTE:
1526 fwd = 'R'; break;
1527 case IP_VS_CONN_F_BYPASS:
1528 fwd = 'B'; break;
1529 default:
1530 fwd = '?'; break;
1531 }
1532 return fwd;
1533}
1534
1535void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1536 struct ip_vs_conn *cp, int dir);
1537
1538#ifdef CONFIG_IP_VS_IPV6
1539void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1540 struct ip_vs_conn *cp, int dir);
1541#endif
1542
1543__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1544
1545static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1546{
1547 __be32 diff[2] = { ~old, new };
1548
1549 return csum_partial(diff, sizeof(diff), oldsum);
1550}
1551
1552#ifdef CONFIG_IP_VS_IPV6
1553static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1554 __wsum oldsum)
1555{
1556 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1557 new[3], new[2], new[1], new[0] };
1558
1559 return csum_partial(diff, sizeof(diff), oldsum);
1560}
1561#endif
1562
1563static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1564{
1565 __be16 diff[2] = { ~old, new };
1566
1567 return csum_partial(diff, sizeof(diff), oldsum);
1568}
1569
1570/* Forget current conntrack (unconfirmed) and attach notrack entry */
1571static inline void ip_vs_notrack(struct sk_buff *skb)
1572{
1573#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1574 enum ip_conntrack_info ctinfo;
1575 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1576
1577 if (ct) {
1578 nf_conntrack_put(&ct->ct_general);
1579 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1580 }
1581#endif
1582}
1583
1584#ifdef CONFIG_IP_VS_NFCT
1585/* Netfilter connection tracking
1586 * (from ip_vs_nfct.c)
1587 */
1588static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1589{
1590#ifdef CONFIG_SYSCTL
1591 return ipvs->sysctl_conntrack;
1592#else
1593 return 0;
1594#endif
1595}
1596
1597void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1598 int outin);
1599int ip_vs_confirm_conntrack(struct sk_buff *skb);
1600void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1601 struct ip_vs_conn *cp, u_int8_t proto,
1602 const __be16 port, int from_rs);
1603void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1604
1605#else
1606
1607static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1608{
1609 return 0;
1610}
1611
1612static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1613 struct ip_vs_conn *cp, int outin)
1614{
1615}
1616
1617static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1618{
1619 return NF_ACCEPT;
1620}
1621
1622static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1623{
1624}
1625#endif /* CONFIG_IP_VS_NFCT */
1626
1627/* Really using conntrack? */
1628static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1629 struct sk_buff *skb)
1630{
1631#ifdef CONFIG_IP_VS_NFCT
1632 enum ip_conntrack_info ctinfo;
1633 struct nf_conn *ct;
1634
1635 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1636 return false;
1637 ct = nf_ct_get(skb, &ctinfo);
1638 if (ct)
1639 return true;
1640#endif
1641 return false;
1642}
1643
1644static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1645{
1646#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1647 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1648 int ret = 0;
1649
1650 if (!(svc->conntrack_afmask & afmask)) {
1651 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1652 if (ret >= 0)
1653 svc->conntrack_afmask |= afmask;
1654 }
1655 return ret;
1656#else
1657 return 0;
1658#endif
1659}
1660
1661static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1662{
1663#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1664 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1665
1666 if (svc->conntrack_afmask & afmask) {
1667 nf_ct_netns_put(svc->ipvs->net, svc->af);
1668 svc->conntrack_afmask &= ~afmask;
1669 }
1670#endif
1671}
1672
1673static inline int
1674ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1675{
1676 /* We think the overhead of processing active connections is 256
1677 * times higher than that of inactive connections in average. (This
1678 * 256 times might not be accurate, we will change it later) We
1679 * use the following formula to estimate the overhead now:
1680 * dest->activeconns*256 + dest->inactconns
1681 */
1682 return (atomic_read(&dest->activeconns) << 8) +
1683 atomic_read(&dest->inactconns);
1684}
1685
1686#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 */