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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#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_NF_CONNTRACK)
29#include <net/netfilter/nf_conntrack.h>
30#endif
31#include <net/net_namespace.h> /* Netw namespace */
32
33#define IP_VS_HDR_INVERSE 1
34#define IP_VS_HDR_ICMP 2
35
36/* Generic access of ipvs struct */
37static inline struct netns_ipvs *net_ipvs(struct net* net)
38{
39 return net->ipvs;
40}
41
42/* Connections' size value needed by ip_vs_ctl.c */
43extern int ip_vs_conn_tab_size;
44
45struct ip_vs_iphdr {
46 int hdr_flags; /* ipvs flags */
47 __u32 off; /* Where IP or IPv4 header starts */
48 __u32 len; /* IPv4 simply where L4 starts
49 * IPv6 where L4 Transport Header starts */
50 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
51 __s16 protocol;
52 __s32 flags;
53 union nf_inet_addr saddr;
54 union nf_inet_addr daddr;
55};
56
57static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
58 int len, void *buffer)
59{
60 return skb_header_pointer(skb, offset, len, buffer);
61}
62
63/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
64 * IPv6 requires some extra work, as finding proper header position,
65 * depend on the IPv6 extension headers.
66 */
67static inline int
68ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
69 int hdr_flags, struct ip_vs_iphdr *iphdr)
70{
71 iphdr->hdr_flags = hdr_flags;
72 iphdr->off = offset;
73
74#ifdef CONFIG_IP_VS_IPV6
75 if (af == AF_INET6) {
76 struct ipv6hdr _iph;
77 const struct ipv6hdr *iph = skb_header_pointer(
78 skb, offset, sizeof(_iph), &_iph);
79 if (!iph)
80 return 0;
81
82 iphdr->saddr.in6 = iph->saddr;
83 iphdr->daddr.in6 = iph->daddr;
84 /* ipv6_find_hdr() updates len, flags */
85 iphdr->len = offset;
86 iphdr->flags = 0;
87 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
88 &iphdr->fragoffs,
89 &iphdr->flags);
90 if (iphdr->protocol < 0)
91 return 0;
92 } else
93#endif
94 {
95 struct iphdr _iph;
96 const struct iphdr *iph = skb_header_pointer(
97 skb, offset, sizeof(_iph), &_iph);
98 if (!iph)
99 return 0;
100
101 iphdr->len = offset + iph->ihl * 4;
102 iphdr->fragoffs = 0;
103 iphdr->protocol = iph->protocol;
104 iphdr->saddr.ip = iph->saddr;
105 iphdr->daddr.ip = iph->daddr;
106 }
107
108 return 1;
109}
110
111static inline int
112ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
113 bool inverse, struct ip_vs_iphdr *iphdr)
114{
115 int hdr_flags = IP_VS_HDR_ICMP;
116
117 if (inverse)
118 hdr_flags |= IP_VS_HDR_INVERSE;
119
120 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
121}
122
123static inline int
124ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
125 struct ip_vs_iphdr *iphdr)
126{
127 int hdr_flags = 0;
128
129 if (inverse)
130 hdr_flags |= IP_VS_HDR_INVERSE;
131
132 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
133 hdr_flags, iphdr);
134}
135
136static inline bool
137ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
138{
139 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
140}
141
142static inline bool
143ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
144{
145 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
146}
147
148static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
149 const union nf_inet_addr *src)
150{
151#ifdef CONFIG_IP_VS_IPV6
152 if (af == AF_INET6)
153 dst->in6 = src->in6;
154 else
155#endif
156 dst->ip = src->ip;
157}
158
159static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
160 const union nf_inet_addr *src)
161{
162#ifdef CONFIG_IP_VS_IPV6
163 if (af == AF_INET6) {
164 dst->in6 = src->in6;
165 return;
166 }
167#endif
168 dst->ip = src->ip;
169 dst->all[1] = 0;
170 dst->all[2] = 0;
171 dst->all[3] = 0;
172}
173
174static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
175 const union nf_inet_addr *b)
176{
177#ifdef CONFIG_IP_VS_IPV6
178 if (af == AF_INET6)
179 return ipv6_addr_equal(&a->in6, &b->in6);
180#endif
181 return a->ip == b->ip;
182}
183
184#ifdef CONFIG_IP_VS_DEBUG
185#include <linux/net.h>
186
187int ip_vs_get_debug_level(void);
188
189static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
190 const union nf_inet_addr *addr,
191 int *idx)
192{
193 int len;
194#ifdef CONFIG_IP_VS_IPV6
195 if (af == AF_INET6)
196 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
197 &addr->in6) + 1;
198 else
199#endif
200 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
201 &addr->ip) + 1;
202
203 *idx += len;
204 BUG_ON(*idx > buf_len + 1);
205 return &buf[*idx - len];
206}
207
208#define IP_VS_DBG_BUF(level, msg, ...) \
209 do { \
210 char ip_vs_dbg_buf[160]; \
211 int ip_vs_dbg_idx = 0; \
212 if (level <= ip_vs_get_debug_level()) \
213 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
214 } while (0)
215#define IP_VS_ERR_BUF(msg...) \
216 do { \
217 char ip_vs_dbg_buf[160]; \
218 int ip_vs_dbg_idx = 0; \
219 pr_err(msg); \
220 } while (0)
221
222/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
223#define IP_VS_DBG_ADDR(af, addr) \
224 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
225 sizeof(ip_vs_dbg_buf), addr, \
226 &ip_vs_dbg_idx)
227
228#define IP_VS_DBG(level, msg, ...) \
229 do { \
230 if (level <= ip_vs_get_debug_level()) \
231 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
232 } while (0)
233#define IP_VS_DBG_RL(msg, ...) \
234 do { \
235 if (net_ratelimit()) \
236 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
237 } while (0)
238#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
239 do { \
240 if (level <= ip_vs_get_debug_level()) \
241 pp->debug_packet(af, pp, skb, ofs, msg); \
242 } while (0)
243#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
244 do { \
245 if (level <= ip_vs_get_debug_level() && \
246 net_ratelimit()) \
247 pp->debug_packet(af, pp, skb, ofs, msg); \
248 } while (0)
249#else /* NO DEBUGGING at ALL */
250#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
251#define IP_VS_ERR_BUF(msg...) do {} while (0)
252#define IP_VS_DBG(level, msg...) do {} while (0)
253#define IP_VS_DBG_RL(msg...) do {} while (0)
254#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
255#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
256#endif
257
258#define IP_VS_BUG() BUG()
259#define IP_VS_ERR_RL(msg, ...) \
260 do { \
261 if (net_ratelimit()) \
262 pr_err(msg, ##__VA_ARGS__); \
263 } while (0)
264
265#ifdef CONFIG_IP_VS_DEBUG
266#define EnterFunction(level) \
267 do { \
268 if (level <= ip_vs_get_debug_level()) \
269 printk(KERN_DEBUG \
270 pr_fmt("Enter: %s, %s line %i\n"), \
271 __func__, __FILE__, __LINE__); \
272 } while (0)
273#define LeaveFunction(level) \
274 do { \
275 if (level <= ip_vs_get_debug_level()) \
276 printk(KERN_DEBUG \
277 pr_fmt("Leave: %s, %s line %i\n"), \
278 __func__, __FILE__, __LINE__); \
279 } while (0)
280#else
281#define EnterFunction(level) do {} while (0)
282#define LeaveFunction(level) do {} while (0)
283#endif
284
285/* The port number of FTP service (in network order). */
286#define FTPPORT cpu_to_be16(21)
287#define FTPDATA cpu_to_be16(20)
288
289/* TCP State Values */
290enum {
291 IP_VS_TCP_S_NONE = 0,
292 IP_VS_TCP_S_ESTABLISHED,
293 IP_VS_TCP_S_SYN_SENT,
294 IP_VS_TCP_S_SYN_RECV,
295 IP_VS_TCP_S_FIN_WAIT,
296 IP_VS_TCP_S_TIME_WAIT,
297 IP_VS_TCP_S_CLOSE,
298 IP_VS_TCP_S_CLOSE_WAIT,
299 IP_VS_TCP_S_LAST_ACK,
300 IP_VS_TCP_S_LISTEN,
301 IP_VS_TCP_S_SYNACK,
302 IP_VS_TCP_S_LAST
303};
304
305/* UDP State Values */
306enum {
307 IP_VS_UDP_S_NORMAL,
308 IP_VS_UDP_S_LAST,
309};
310
311/* ICMP State Values */
312enum {
313 IP_VS_ICMP_S_NORMAL,
314 IP_VS_ICMP_S_LAST,
315};
316
317/* SCTP State Values */
318enum ip_vs_sctp_states {
319 IP_VS_SCTP_S_NONE,
320 IP_VS_SCTP_S_INIT1,
321 IP_VS_SCTP_S_INIT,
322 IP_VS_SCTP_S_COOKIE_SENT,
323 IP_VS_SCTP_S_COOKIE_REPLIED,
324 IP_VS_SCTP_S_COOKIE_WAIT,
325 IP_VS_SCTP_S_COOKIE,
326 IP_VS_SCTP_S_COOKIE_ECHOED,
327 IP_VS_SCTP_S_ESTABLISHED,
328 IP_VS_SCTP_S_SHUTDOWN_SENT,
329 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
330 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
331 IP_VS_SCTP_S_REJECTED,
332 IP_VS_SCTP_S_CLOSED,
333 IP_VS_SCTP_S_LAST
334};
335
336/* Connection templates use bits from state */
337#define IP_VS_CTPL_S_NONE 0x0000
338#define IP_VS_CTPL_S_ASSURED 0x0001
339#define IP_VS_CTPL_S_LAST 0x0002
340
341/* Delta sequence info structure
342 * Each ip_vs_conn has 2 (output AND input seq. changes).
343 * Only used in the VS/NAT.
344 */
345struct ip_vs_seq {
346 __u32 init_seq; /* Add delta from this seq */
347 __u32 delta; /* Delta in sequence numbers */
348 __u32 previous_delta; /* Delta in sequence numbers
349 * before last resized pkt */
350};
351
352/* counters per cpu */
353struct ip_vs_counters {
354 __u64 conns; /* connections scheduled */
355 __u64 inpkts; /* incoming packets */
356 __u64 outpkts; /* outgoing packets */
357 __u64 inbytes; /* incoming bytes */
358 __u64 outbytes; /* outgoing bytes */
359};
360/* Stats per cpu */
361struct ip_vs_cpu_stats {
362 struct ip_vs_counters cnt;
363 struct u64_stats_sync syncp;
364};
365
366/* IPVS statistics objects */
367struct ip_vs_estimator {
368 struct list_head list;
369
370 u64 last_inbytes;
371 u64 last_outbytes;
372 u64 last_conns;
373 u64 last_inpkts;
374 u64 last_outpkts;
375
376 u64 cps;
377 u64 inpps;
378 u64 outpps;
379 u64 inbps;
380 u64 outbps;
381};
382
383/*
384 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
385 */
386struct ip_vs_kstats {
387 u64 conns; /* connections scheduled */
388 u64 inpkts; /* incoming packets */
389 u64 outpkts; /* outgoing packets */
390 u64 inbytes; /* incoming bytes */
391 u64 outbytes; /* outgoing bytes */
392
393 u64 cps; /* current connection rate */
394 u64 inpps; /* current in packet rate */
395 u64 outpps; /* current out packet rate */
396 u64 inbps; /* current in byte rate */
397 u64 outbps; /* current out byte rate */
398};
399
400struct ip_vs_stats {
401 struct ip_vs_kstats kstats; /* kernel statistics */
402 struct ip_vs_estimator est; /* estimator */
403 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
404 spinlock_t lock; /* spin lock */
405 struct ip_vs_kstats kstats0; /* reset values */
406};
407
408struct dst_entry;
409struct iphdr;
410struct ip_vs_conn;
411struct ip_vs_app;
412struct sk_buff;
413struct ip_vs_proto_data;
414
415struct ip_vs_protocol {
416 struct ip_vs_protocol *next;
417 char *name;
418 u16 protocol;
419 u16 num_states;
420 int dont_defrag;
421
422 void (*init)(struct ip_vs_protocol *pp);
423
424 void (*exit)(struct ip_vs_protocol *pp);
425
426 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
427
428 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
429
430 int (*conn_schedule)(struct netns_ipvs *ipvs,
431 int af, struct sk_buff *skb,
432 struct ip_vs_proto_data *pd,
433 int *verdict, struct ip_vs_conn **cpp,
434 struct ip_vs_iphdr *iph);
435
436 struct ip_vs_conn *
437 (*conn_in_get)(struct netns_ipvs *ipvs,
438 int af,
439 const struct sk_buff *skb,
440 const struct ip_vs_iphdr *iph);
441
442 struct ip_vs_conn *
443 (*conn_out_get)(struct netns_ipvs *ipvs,
444 int af,
445 const struct sk_buff *skb,
446 const struct ip_vs_iphdr *iph);
447
448 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
449 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
450
451 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
452 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
453
454 const char *(*state_name)(int state);
455
456 void (*state_transition)(struct ip_vs_conn *cp, int direction,
457 const struct sk_buff *skb,
458 struct ip_vs_proto_data *pd);
459
460 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
461
462 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
463
464 int (*app_conn_bind)(struct ip_vs_conn *cp);
465
466 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
467 const struct sk_buff *skb,
468 int offset,
469 const char *msg);
470
471 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
472};
473
474/* protocol data per netns */
475struct ip_vs_proto_data {
476 struct ip_vs_proto_data *next;
477 struct ip_vs_protocol *pp;
478 int *timeout_table; /* protocol timeout table */
479 atomic_t appcnt; /* counter of proto app incs. */
480 struct tcp_states_t *tcp_state_table;
481};
482
483struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
484struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
485 unsigned short proto);
486
487struct ip_vs_conn_param {
488 struct netns_ipvs *ipvs;
489 const union nf_inet_addr *caddr;
490 const union nf_inet_addr *vaddr;
491 __be16 cport;
492 __be16 vport;
493 __u16 protocol;
494 u16 af;
495
496 const struct ip_vs_pe *pe;
497 char *pe_data;
498 __u8 pe_data_len;
499};
500
501/* IP_VS structure allocated for each dynamically scheduled connection */
502struct ip_vs_conn {
503 struct hlist_node c_list; /* hashed list heads */
504 /* Protocol, addresses and port numbers */
505 __be16 cport;
506 __be16 dport;
507 __be16 vport;
508 u16 af; /* address family */
509 union nf_inet_addr caddr; /* client address */
510 union nf_inet_addr vaddr; /* virtual address */
511 union nf_inet_addr daddr; /* destination address */
512 volatile __u32 flags; /* status flags */
513 __u16 protocol; /* Which protocol (TCP/UDP) */
514 __u16 daf; /* Address family of the dest */
515 struct netns_ipvs *ipvs;
516
517 /* counter and timer */
518 refcount_t refcnt; /* reference count */
519 struct timer_list timer; /* Expiration timer */
520 volatile unsigned long timeout; /* timeout */
521
522 /* Flags and state transition */
523 spinlock_t lock; /* lock for state transition */
524 volatile __u16 state; /* state info */
525 volatile __u16 old_state; /* old state, to be used for
526 * state transition triggerd
527 * synchronization
528 */
529 __u32 fwmark; /* Fire wall mark from skb */
530 unsigned long sync_endtime; /* jiffies + sent_retries */
531
532 /* Control members */
533 struct ip_vs_conn *control; /* Master control connection */
534 atomic_t n_control; /* Number of controlled ones */
535 struct ip_vs_dest *dest; /* real server */
536 atomic_t in_pkts; /* incoming packet counter */
537
538 /* Packet transmitter for different forwarding methods. If it
539 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
540 * otherwise this must be changed to a sk_buff **.
541 * NF_ACCEPT can be returned when destination is local.
542 */
543 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
544 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
545
546 /* Note: we can group the following members into a structure,
547 * in order to save more space, and the following members are
548 * only used in VS/NAT anyway
549 */
550 struct ip_vs_app *app; /* bound ip_vs_app object */
551 void *app_data; /* Application private data */
552 struct ip_vs_seq in_seq; /* incoming seq. struct */
553 struct ip_vs_seq out_seq; /* outgoing seq. struct */
554
555 const struct ip_vs_pe *pe;
556 char *pe_data;
557 __u8 pe_data_len;
558
559 struct rcu_head rcu_head;
560};
561
562/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
563 * for IPv6 support.
564 *
565 * We need these to conveniently pass around service and destination
566 * options, but unfortunately, we also need to keep the old definitions to
567 * maintain userspace backwards compatibility for the setsockopt interface.
568 */
569struct ip_vs_service_user_kern {
570 /* virtual service addresses */
571 u16 af;
572 u16 protocol;
573 union nf_inet_addr addr; /* virtual ip address */
574 __be16 port;
575 u32 fwmark; /* firwall mark of service */
576
577 /* virtual service options */
578 char *sched_name;
579 char *pe_name;
580 unsigned int flags; /* virtual service flags */
581 unsigned int timeout; /* persistent timeout in sec */
582 __be32 netmask; /* persistent netmask or plen */
583};
584
585
586struct ip_vs_dest_user_kern {
587 /* destination server address */
588 union nf_inet_addr addr;
589 __be16 port;
590
591 /* real server options */
592 unsigned int conn_flags; /* connection flags */
593 int weight; /* destination weight */
594
595 /* thresholds for active connections */
596 u32 u_threshold; /* upper threshold */
597 u32 l_threshold; /* lower threshold */
598
599 /* Address family of addr */
600 u16 af;
601
602 u16 tun_type; /* tunnel type */
603 __be16 tun_port; /* tunnel port */
604 u16 tun_flags; /* tunnel flags */
605};
606
607
608/*
609 * The information about the virtual service offered to the net and the
610 * forwarding entries.
611 */
612struct ip_vs_service {
613 struct hlist_node s_list; /* for normal service table */
614 struct hlist_node f_list; /* for fwmark-based service table */
615 atomic_t refcnt; /* reference counter */
616
617 u16 af; /* address family */
618 __u16 protocol; /* which protocol (TCP/UDP) */
619 union nf_inet_addr addr; /* IP address for virtual service */
620 __be16 port; /* port number for the service */
621 __u32 fwmark; /* firewall mark of the service */
622 unsigned int flags; /* service status flags */
623 unsigned int timeout; /* persistent timeout in ticks */
624 __be32 netmask; /* grouping granularity, mask/plen */
625 struct netns_ipvs *ipvs;
626
627 struct list_head destinations; /* real server d-linked list */
628 __u32 num_dests; /* number of servers */
629 struct ip_vs_stats stats; /* statistics for the service */
630
631 /* for scheduling */
632 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
633 spinlock_t sched_lock; /* lock sched_data */
634 void *sched_data; /* scheduler application data */
635
636 /* alternate persistence engine */
637 struct ip_vs_pe __rcu *pe;
638 int conntrack_afmask;
639
640 struct rcu_head rcu_head;
641};
642
643/* Information for cached dst */
644struct ip_vs_dest_dst {
645 struct dst_entry *dst_cache; /* destination cache entry */
646 u32 dst_cookie;
647 union nf_inet_addr dst_saddr;
648 struct rcu_head rcu_head;
649};
650
651/* The real server destination forwarding entry with ip address, port number,
652 * and so on.
653 */
654struct ip_vs_dest {
655 struct list_head n_list; /* for the dests in the service */
656 struct hlist_node d_list; /* for table with all the dests */
657
658 u16 af; /* address family */
659 __be16 port; /* port number of the server */
660 union nf_inet_addr addr; /* IP address of the server */
661 volatile unsigned int flags; /* dest status flags */
662 atomic_t conn_flags; /* flags to copy to conn */
663 atomic_t weight; /* server weight */
664 atomic_t last_weight; /* server latest weight */
665 __u16 tun_type; /* tunnel type */
666 __be16 tun_port; /* tunnel port */
667 __u16 tun_flags; /* tunnel flags */
668
669 refcount_t refcnt; /* reference counter */
670 struct ip_vs_stats stats; /* statistics */
671 unsigned long idle_start; /* start time, jiffies */
672
673 /* connection counters and thresholds */
674 atomic_t activeconns; /* active connections */
675 atomic_t inactconns; /* inactive connections */
676 atomic_t persistconns; /* persistent connections */
677 __u32 u_threshold; /* upper threshold */
678 __u32 l_threshold; /* lower threshold */
679
680 /* for destination cache */
681 spinlock_t dst_lock; /* lock of dst_cache */
682 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
683
684 /* for virtual service */
685 struct ip_vs_service __rcu *svc; /* service it belongs to */
686 __u16 protocol; /* which protocol (TCP/UDP) */
687 __be16 vport; /* virtual port number */
688 union nf_inet_addr vaddr; /* virtual IP address */
689 __u32 vfwmark; /* firewall mark of service */
690
691 struct list_head t_list; /* in dest_trash */
692 unsigned int in_rs_table:1; /* we are in rs_table */
693};
694
695/* The scheduler object */
696struct ip_vs_scheduler {
697 struct list_head n_list; /* d-linked list head */
698 char *name; /* scheduler name */
699 atomic_t refcnt; /* reference counter */
700 struct module *module; /* THIS_MODULE/NULL */
701
702 /* scheduler initializing service */
703 int (*init_service)(struct ip_vs_service *svc);
704 /* scheduling service finish */
705 void (*done_service)(struct ip_vs_service *svc);
706 /* dest is linked */
707 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
708 /* dest is unlinked */
709 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is updated */
711 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712
713 /* selecting a server from the given service */
714 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
715 const struct sk_buff *skb,
716 struct ip_vs_iphdr *iph);
717};
718
719/* The persistence engine object */
720struct ip_vs_pe {
721 struct list_head n_list; /* d-linked list head */
722 char *name; /* scheduler name */
723 atomic_t refcnt; /* reference counter */
724 struct module *module; /* THIS_MODULE/NULL */
725
726 /* get the connection template, if any */
727 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
728 bool (*ct_match)(const struct ip_vs_conn_param *p,
729 struct ip_vs_conn *ct);
730 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
731 bool inverse);
732 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
733 /* create connections for real-server outgoing packets */
734 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
735 struct ip_vs_dest *dest,
736 struct sk_buff *skb,
737 const struct ip_vs_iphdr *iph,
738 __be16 dport, __be16 cport);
739};
740
741/* The application module object (a.k.a. app incarnation) */
742struct ip_vs_app {
743 struct list_head a_list; /* member in app list */
744 int type; /* IP_VS_APP_TYPE_xxx */
745 char *name; /* application module name */
746 __u16 protocol;
747 struct module *module; /* THIS_MODULE/NULL */
748 struct list_head incs_list; /* list of incarnations */
749
750 /* members for application incarnations */
751 struct list_head p_list; /* member in proto app list */
752 struct ip_vs_app *app; /* its real application */
753 __be16 port; /* port number in net order */
754 atomic_t usecnt; /* usage counter */
755 struct rcu_head rcu_head;
756
757 /* output hook: Process packet in inout direction, diff set for TCP.
758 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
759 * 2=Mangled but checksum was not updated
760 */
761 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
762 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
763
764 /* input hook: Process packet in outin direction, diff set for TCP.
765 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
766 * 2=Mangled but checksum was not updated
767 */
768 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
769 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
770
771 /* ip_vs_app initializer */
772 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
773
774 /* ip_vs_app finish */
775 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
776
777
778 /* not used now */
779 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
780 struct ip_vs_protocol *);
781
782 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
783
784 int * timeout_table;
785 int * timeouts;
786 int timeouts_size;
787
788 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
789 int *verdict, struct ip_vs_conn **cpp);
790
791 struct ip_vs_conn *
792 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
793 const struct iphdr *iph, int inverse);
794
795 struct ip_vs_conn *
796 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
797 const struct iphdr *iph, int inverse);
798
799 int (*state_transition)(struct ip_vs_conn *cp, int direction,
800 const struct sk_buff *skb,
801 struct ip_vs_app *app);
802
803 void (*timeout_change)(struct ip_vs_app *app, int flags);
804};
805
806struct ipvs_master_sync_state {
807 struct list_head sync_queue;
808 struct ip_vs_sync_buff *sync_buff;
809 unsigned long sync_queue_len;
810 unsigned int sync_queue_delay;
811 struct delayed_work master_wakeup_work;
812 struct netns_ipvs *ipvs;
813};
814
815struct ip_vs_sync_thread_data;
816
817/* How much time to keep dests in trash */
818#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
819
820struct ipvs_sync_daemon_cfg {
821 union nf_inet_addr mcast_group;
822 int syncid;
823 u16 sync_maxlen;
824 u16 mcast_port;
825 u8 mcast_af;
826 u8 mcast_ttl;
827 /* multicast interface name */
828 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
829};
830
831/* IPVS in network namespace */
832struct netns_ipvs {
833 int gen; /* Generation */
834 int enable; /* enable like nf_hooks do */
835 /* Hash table: for real service lookups */
836 #define IP_VS_RTAB_BITS 4
837 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
838 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
839
840 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
841 /* ip_vs_app */
842 struct list_head app_list;
843 /* ip_vs_proto */
844 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
845 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
846 /* ip_vs_proto_tcp */
847#ifdef CONFIG_IP_VS_PROTO_TCP
848 #define TCP_APP_TAB_BITS 4
849 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
850 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
851 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
852#endif
853 /* ip_vs_proto_udp */
854#ifdef CONFIG_IP_VS_PROTO_UDP
855 #define UDP_APP_TAB_BITS 4
856 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
857 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
858 struct list_head udp_apps[UDP_APP_TAB_SIZE];
859#endif
860 /* ip_vs_proto_sctp */
861#ifdef CONFIG_IP_VS_PROTO_SCTP
862 #define SCTP_APP_TAB_BITS 4
863 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
864 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
865 /* Hash table for SCTP application incarnations */
866 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
867#endif
868 /* ip_vs_conn */
869 atomic_t conn_count; /* connection counter */
870
871 /* ip_vs_ctl */
872 struct ip_vs_stats tot_stats; /* Statistics & est. */
873
874 int num_services; /* no of virtual services */
875 int num_services6; /* IPv6 virtual services */
876
877 /* Trash for destinations */
878 struct list_head dest_trash;
879 spinlock_t dest_trash_lock;
880 struct timer_list dest_trash_timer; /* expiration timer */
881 /* Service counters */
882 atomic_t ftpsvc_counter;
883 atomic_t nullsvc_counter;
884 atomic_t conn_out_counter;
885
886#ifdef CONFIG_SYSCTL
887 /* delayed work for expiring no dest connections */
888 struct delayed_work expire_nodest_conn_work;
889 /* 1/rate drop and drop-entry variables */
890 struct delayed_work defense_work; /* Work handler */
891 int drop_rate;
892 int drop_counter;
893 int old_secure_tcp;
894 atomic_t dropentry;
895 /* locks in ctl.c */
896 spinlock_t dropentry_lock; /* drop entry handling */
897 spinlock_t droppacket_lock; /* drop packet handling */
898 spinlock_t securetcp_lock; /* state and timeout tables */
899
900 /* sys-ctl struct */
901 struct ctl_table_header *sysctl_hdr;
902 struct ctl_table *sysctl_tbl;
903#endif
904
905 /* sysctl variables */
906 int sysctl_amemthresh;
907 int sysctl_am_droprate;
908 int sysctl_drop_entry;
909 int sysctl_drop_packet;
910 int sysctl_secure_tcp;
911#ifdef CONFIG_IP_VS_NFCT
912 int sysctl_conntrack;
913#endif
914 int sysctl_snat_reroute;
915 int sysctl_sync_ver;
916 int sysctl_sync_ports;
917 int sysctl_sync_persist_mode;
918 unsigned long sysctl_sync_qlen_max;
919 int sysctl_sync_sock_size;
920 int sysctl_cache_bypass;
921 int sysctl_expire_nodest_conn;
922 int sysctl_sloppy_tcp;
923 int sysctl_sloppy_sctp;
924 int sysctl_expire_quiescent_template;
925 int sysctl_sync_threshold[2];
926 unsigned int sysctl_sync_refresh_period;
927 int sysctl_sync_retries;
928 int sysctl_nat_icmp_send;
929 int sysctl_pmtu_disc;
930 int sysctl_backup_only;
931 int sysctl_conn_reuse_mode;
932 int sysctl_schedule_icmp;
933 int sysctl_ignore_tunneled;
934
935 /* ip_vs_lblc */
936 int sysctl_lblc_expiration;
937 struct ctl_table_header *lblc_ctl_header;
938 struct ctl_table *lblc_ctl_table;
939 /* ip_vs_lblcr */
940 int sysctl_lblcr_expiration;
941 struct ctl_table_header *lblcr_ctl_header;
942 struct ctl_table *lblcr_ctl_table;
943 /* ip_vs_est */
944 struct list_head est_list; /* estimator list */
945 spinlock_t est_lock;
946 struct timer_list est_timer; /* Estimation timer */
947 /* ip_vs_sync */
948 spinlock_t sync_lock;
949 struct ipvs_master_sync_state *ms;
950 spinlock_t sync_buff_lock;
951 struct ip_vs_sync_thread_data *master_tinfo;
952 struct ip_vs_sync_thread_data *backup_tinfo;
953 int threads_mask;
954 volatile int sync_state;
955 struct mutex sync_mutex;
956 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
957 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
958 /* net name space ptr */
959 struct net *net; /* Needed by timer routines */
960 /* Number of heterogeneous destinations, needed becaus heterogeneous
961 * are not supported when synchronization is enabled.
962 */
963 unsigned int mixed_address_family_dests;
964 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
965};
966
967#define DEFAULT_SYNC_THRESHOLD 3
968#define DEFAULT_SYNC_PERIOD 50
969#define DEFAULT_SYNC_VER 1
970#define DEFAULT_SLOPPY_TCP 0
971#define DEFAULT_SLOPPY_SCTP 0
972#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
973#define DEFAULT_SYNC_RETRIES 0
974#define IPVS_SYNC_WAKEUP_RATE 8
975#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
976#define IPVS_SYNC_SEND_DELAY (HZ / 50)
977#define IPVS_SYNC_CHECK_PERIOD HZ
978#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
979#define IPVS_SYNC_PORTS_MAX (1 << 6)
980
981#ifdef CONFIG_SYSCTL
982
983static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
984{
985 return ipvs->sysctl_sync_threshold[0];
986}
987
988static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
989{
990 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
991}
992
993static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
994{
995 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
996}
997
998static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
999{
1000 return ipvs->sysctl_sync_retries;
1001}
1002
1003static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1004{
1005 return ipvs->sysctl_sync_ver;
1006}
1007
1008static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1009{
1010 return ipvs->sysctl_sloppy_tcp;
1011}
1012
1013static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1014{
1015 return ipvs->sysctl_sloppy_sctp;
1016}
1017
1018static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1019{
1020 return READ_ONCE(ipvs->sysctl_sync_ports);
1021}
1022
1023static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1024{
1025 return ipvs->sysctl_sync_persist_mode;
1026}
1027
1028static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1029{
1030 return ipvs->sysctl_sync_qlen_max;
1031}
1032
1033static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1034{
1035 return ipvs->sysctl_sync_sock_size;
1036}
1037
1038static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1039{
1040 return ipvs->sysctl_pmtu_disc;
1041}
1042
1043static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1044{
1045 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1046 ipvs->sysctl_backup_only;
1047}
1048
1049static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1050{
1051 return ipvs->sysctl_conn_reuse_mode;
1052}
1053
1054static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1055{
1056 return ipvs->sysctl_expire_nodest_conn;
1057}
1058
1059static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1060{
1061 return ipvs->sysctl_schedule_icmp;
1062}
1063
1064static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1065{
1066 return ipvs->sysctl_ignore_tunneled;
1067}
1068
1069static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1070{
1071 return ipvs->sysctl_cache_bypass;
1072}
1073
1074#else
1075
1076static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1077{
1078 return DEFAULT_SYNC_THRESHOLD;
1079}
1080
1081static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1082{
1083 return DEFAULT_SYNC_PERIOD;
1084}
1085
1086static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1087{
1088 return DEFAULT_SYNC_REFRESH_PERIOD;
1089}
1090
1091static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1092{
1093 return DEFAULT_SYNC_RETRIES & 3;
1094}
1095
1096static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1097{
1098 return DEFAULT_SYNC_VER;
1099}
1100
1101static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1102{
1103 return DEFAULT_SLOPPY_TCP;
1104}
1105
1106static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1107{
1108 return DEFAULT_SLOPPY_SCTP;
1109}
1110
1111static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1112{
1113 return 1;
1114}
1115
1116static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1117{
1118 return 0;
1119}
1120
1121static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1122{
1123 return IPVS_SYNC_QLEN_MAX;
1124}
1125
1126static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1127{
1128 return 0;
1129}
1130
1131static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1132{
1133 return 1;
1134}
1135
1136static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1137{
1138 return 0;
1139}
1140
1141static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1142{
1143 return 1;
1144}
1145
1146static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1147{
1148 return 0;
1149}
1150
1151static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1152{
1153 return 0;
1154}
1155
1156static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1157{
1158 return 0;
1159}
1160
1161static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1162{
1163 return 0;
1164}
1165
1166#endif
1167
1168/* IPVS core functions
1169 * (from ip_vs_core.c)
1170 */
1171const char *ip_vs_proto_name(unsigned int proto);
1172void ip_vs_init_hash_table(struct list_head *table, int rows);
1173struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1174 struct ip_vs_dest *dest,
1175 struct sk_buff *skb,
1176 const struct ip_vs_iphdr *iph,
1177 __be16 dport,
1178 __be16 cport);
1179#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1180
1181#define IP_VS_APP_TYPE_FTP 1
1182
1183/* ip_vs_conn handling functions
1184 * (from ip_vs_conn.c)
1185 */
1186enum {
1187 IP_VS_DIR_INPUT = 0,
1188 IP_VS_DIR_OUTPUT,
1189 IP_VS_DIR_INPUT_ONLY,
1190 IP_VS_DIR_LAST,
1191};
1192
1193static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1194 const union nf_inet_addr *caddr,
1195 __be16 cport,
1196 const union nf_inet_addr *vaddr,
1197 __be16 vport,
1198 struct ip_vs_conn_param *p)
1199{
1200 p->ipvs = ipvs;
1201 p->af = af;
1202 p->protocol = protocol;
1203 p->caddr = caddr;
1204 p->cport = cport;
1205 p->vaddr = vaddr;
1206 p->vport = vport;
1207 p->pe = NULL;
1208 p->pe_data = NULL;
1209}
1210
1211struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1212struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1213
1214struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1215 const struct sk_buff *skb,
1216 const struct ip_vs_iphdr *iph);
1217
1218struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1219
1220struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1221 const struct sk_buff *skb,
1222 const struct ip_vs_iphdr *iph);
1223
1224/* Get reference to gain full access to conn.
1225 * By default, RCU read-side critical sections have access only to
1226 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1227 */
1228static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1229{
1230 return refcount_inc_not_zero(&cp->refcnt);
1231}
1232
1233/* put back the conn without restarting its timer */
1234static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1235{
1236 smp_mb__before_atomic();
1237 refcount_dec(&cp->refcnt);
1238}
1239void ip_vs_conn_put(struct ip_vs_conn *cp);
1240void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1241
1242struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1243 const union nf_inet_addr *daddr,
1244 __be16 dport, unsigned int flags,
1245 struct ip_vs_dest *dest, __u32 fwmark);
1246void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1247
1248const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1249
1250void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1251int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1252void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1253int ip_vs_conn_init(void);
1254void ip_vs_conn_cleanup(void);
1255
1256static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1257{
1258 struct ip_vs_conn *ctl_cp = cp->control;
1259 if (!ctl_cp) {
1260 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1261 "%s:%d to %s:%d\n",
1262 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1263 ntohs(cp->cport),
1264 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1265 ntohs(cp->vport));
1266
1267 return;
1268 }
1269
1270 IP_VS_DBG_BUF(7, "DELeting control for: "
1271 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1272 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1273 ntohs(cp->cport),
1274 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1275 ntohs(ctl_cp->cport));
1276
1277 cp->control = NULL;
1278 if (atomic_read(&ctl_cp->n_control) == 0) {
1279 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1280 "%s:%d to %s:%d\n",
1281 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1282 ntohs(cp->cport),
1283 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1284 ntohs(cp->vport));
1285
1286 return;
1287 }
1288 atomic_dec(&ctl_cp->n_control);
1289}
1290
1291static inline void
1292ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1293{
1294 if (cp->control) {
1295 IP_VS_ERR_BUF("request control ADD for already controlled: "
1296 "%s:%d to %s:%d\n",
1297 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1298 ntohs(cp->cport),
1299 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1300 ntohs(cp->vport));
1301
1302 ip_vs_control_del(cp);
1303 }
1304
1305 IP_VS_DBG_BUF(7, "ADDing control for: "
1306 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1307 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1308 ntohs(cp->cport),
1309 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1310 ntohs(ctl_cp->cport));
1311
1312 cp->control = ctl_cp;
1313 atomic_inc(&ctl_cp->n_control);
1314}
1315
1316/* Mark our template as assured */
1317static inline void
1318ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1319{
1320 struct ip_vs_conn *ct = cp->control;
1321
1322 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1323 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1324 ct->state |= IP_VS_CTPL_S_ASSURED;
1325}
1326
1327/* IPVS netns init & cleanup functions */
1328int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1329int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1330int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1331int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1332int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1333int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1334void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1335void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1336void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1337void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1338void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1339void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1340void ip_vs_service_nets_cleanup(struct list_head *net_list);
1341
1342/* IPVS application functions
1343 * (from ip_vs_app.c)
1344 */
1345#define IP_VS_APP_MAX_PORTS 8
1346struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1347void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1348int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1349void ip_vs_unbind_app(struct ip_vs_conn *cp);
1350int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1351 __u16 port);
1352int ip_vs_app_inc_get(struct ip_vs_app *inc);
1353void ip_vs_app_inc_put(struct ip_vs_app *inc);
1354
1355int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1356 struct ip_vs_iphdr *ipvsh);
1357int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1358 struct ip_vs_iphdr *ipvsh);
1359
1360int register_ip_vs_pe(struct ip_vs_pe *pe);
1361int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1362struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1363struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1364
1365/* Use a #define to avoid all of module.h just for these trivial ops */
1366#define ip_vs_pe_get(pe) \
1367 if (pe && pe->module) \
1368 __module_get(pe->module);
1369
1370#define ip_vs_pe_put(pe) \
1371 if (pe && pe->module) \
1372 module_put(pe->module);
1373
1374/* IPVS protocol functions (from ip_vs_proto.c) */
1375int ip_vs_protocol_init(void);
1376void ip_vs_protocol_cleanup(void);
1377void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1378int *ip_vs_create_timeout_table(int *table, int size);
1379void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1380 const struct sk_buff *skb, int offset,
1381 const char *msg);
1382
1383extern struct ip_vs_protocol ip_vs_protocol_tcp;
1384extern struct ip_vs_protocol ip_vs_protocol_udp;
1385extern struct ip_vs_protocol ip_vs_protocol_icmp;
1386extern struct ip_vs_protocol ip_vs_protocol_esp;
1387extern struct ip_vs_protocol ip_vs_protocol_ah;
1388extern struct ip_vs_protocol ip_vs_protocol_sctp;
1389
1390/* Registering/unregistering scheduler functions
1391 * (from ip_vs_sched.c)
1392 */
1393int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1394int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1395int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1396 struct ip_vs_scheduler *scheduler);
1397void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1398 struct ip_vs_scheduler *sched);
1399struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1400void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1401struct ip_vs_conn *
1402ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1403 struct ip_vs_proto_data *pd, int *ignored,
1404 struct ip_vs_iphdr *iph);
1405int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1406 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1407
1408void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1409
1410/* IPVS control data and functions (from ip_vs_ctl.c) */
1411extern struct ip_vs_stats ip_vs_stats;
1412extern int sysctl_ip_vs_sync_ver;
1413
1414struct ip_vs_service *
1415ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1416 const union nf_inet_addr *vaddr, __be16 vport);
1417
1418bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1419 const union nf_inet_addr *daddr, __be16 dport);
1420
1421struct ip_vs_dest *
1422ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1423 const union nf_inet_addr *daddr, __be16 dport);
1424struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1425 const union nf_inet_addr *daddr,
1426 __be16 tun_port);
1427
1428int ip_vs_use_count_inc(void);
1429void ip_vs_use_count_dec(void);
1430int ip_vs_register_nl_ioctl(void);
1431void ip_vs_unregister_nl_ioctl(void);
1432int ip_vs_control_init(void);
1433void ip_vs_control_cleanup(void);
1434struct ip_vs_dest *
1435ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1436 const union nf_inet_addr *daddr, __be16 dport,
1437 const union nf_inet_addr *vaddr, __be16 vport,
1438 __u16 protocol, __u32 fwmark, __u32 flags);
1439void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1440
1441static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1442{
1443 refcount_inc(&dest->refcnt);
1444}
1445
1446static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1447{
1448 smp_mb__before_atomic();
1449 refcount_dec(&dest->refcnt);
1450}
1451
1452static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1453{
1454 if (refcount_dec_and_test(&dest->refcnt))
1455 kfree(dest);
1456}
1457
1458/* IPVS sync daemon data and function prototypes
1459 * (from ip_vs_sync.c)
1460 */
1461int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1462 int state);
1463int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1464void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1465
1466/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1467void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1468void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1469void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1470void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1471
1472/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1473int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1474 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1475int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1476 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1477int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1478 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, int offset,
1485 unsigned int hooknum, struct ip_vs_iphdr *iph);
1486void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1487
1488#ifdef CONFIG_IP_VS_IPV6
1489int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1490 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1491int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1492 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1493int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1494 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1495int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1496 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1497int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1498 struct ip_vs_protocol *pp, int offset,
1499 unsigned int hooknum, struct ip_vs_iphdr *iph);
1500#endif
1501
1502#ifdef CONFIG_SYSCTL
1503/* This is a simple mechanism to ignore packets when
1504 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1505 * we start to drop 1/rate of the packets
1506 */
1507static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1508{
1509 if (!ipvs->drop_rate)
1510 return 0;
1511 if (--ipvs->drop_counter > 0)
1512 return 0;
1513 ipvs->drop_counter = ipvs->drop_rate;
1514 return 1;
1515}
1516#else
1517static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1518#endif
1519
1520#ifdef CONFIG_SYSCTL
1521/* Enqueue delayed work for expiring no dest connections
1522 * Only run when sysctl_expire_nodest=1
1523 */
1524static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1525{
1526 if (sysctl_expire_nodest_conn(ipvs))
1527 queue_delayed_work(system_long_wq,
1528 &ipvs->expire_nodest_conn_work, 1);
1529}
1530
1531void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1532#else
1533static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1534#endif
1535
1536#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1537 IP_VS_CONN_F_FWD_MASK)
1538
1539/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1540#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1541
1542static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1543{
1544 char fwd;
1545
1546 switch (IP_VS_FWD_METHOD(cp)) {
1547 case IP_VS_CONN_F_MASQ:
1548 fwd = 'M'; break;
1549 case IP_VS_CONN_F_LOCALNODE:
1550 fwd = 'L'; break;
1551 case IP_VS_CONN_F_TUNNEL:
1552 fwd = 'T'; break;
1553 case IP_VS_CONN_F_DROUTE:
1554 fwd = 'R'; break;
1555 case IP_VS_CONN_F_BYPASS:
1556 fwd = 'B'; break;
1557 default:
1558 fwd = '?'; break;
1559 }
1560 return fwd;
1561}
1562
1563void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1564 struct ip_vs_conn *cp, int dir);
1565
1566#ifdef CONFIG_IP_VS_IPV6
1567void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1568 struct ip_vs_conn *cp, int dir);
1569#endif
1570
1571__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1572
1573static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1574{
1575 __be32 diff[2] = { ~old, new };
1576
1577 return csum_partial(diff, sizeof(diff), oldsum);
1578}
1579
1580#ifdef CONFIG_IP_VS_IPV6
1581static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1582 __wsum oldsum)
1583{
1584 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1585 new[3], new[2], new[1], new[0] };
1586
1587 return csum_partial(diff, sizeof(diff), oldsum);
1588}
1589#endif
1590
1591static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1592{
1593 __be16 diff[2] = { ~old, new };
1594
1595 return csum_partial(diff, sizeof(diff), oldsum);
1596}
1597
1598/* Forget current conntrack (unconfirmed) and attach notrack entry */
1599static inline void ip_vs_notrack(struct sk_buff *skb)
1600{
1601#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1602 enum ip_conntrack_info ctinfo;
1603 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1604
1605 if (ct) {
1606 nf_conntrack_put(&ct->ct_general);
1607 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1608 }
1609#endif
1610}
1611
1612#ifdef CONFIG_IP_VS_NFCT
1613/* Netfilter connection tracking
1614 * (from ip_vs_nfct.c)
1615 */
1616static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1617{
1618#ifdef CONFIG_SYSCTL
1619 return ipvs->sysctl_conntrack;
1620#else
1621 return 0;
1622#endif
1623}
1624
1625void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1626 int outin);
1627int ip_vs_confirm_conntrack(struct sk_buff *skb);
1628void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1629 struct ip_vs_conn *cp, u_int8_t proto,
1630 const __be16 port, int from_rs);
1631void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1632
1633#else
1634
1635static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1636{
1637 return 0;
1638}
1639
1640static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1641 struct ip_vs_conn *cp, int outin)
1642{
1643}
1644
1645static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1646{
1647 return NF_ACCEPT;
1648}
1649
1650static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1651{
1652}
1653#endif /* CONFIG_IP_VS_NFCT */
1654
1655/* Using old conntrack that can not be redirected to another real server? */
1656static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1657 struct sk_buff *skb)
1658{
1659#ifdef CONFIG_IP_VS_NFCT
1660 enum ip_conntrack_info ctinfo;
1661 struct nf_conn *ct;
1662
1663 ct = nf_ct_get(skb, &ctinfo);
1664 if (ct && nf_ct_is_confirmed(ct))
1665 return true;
1666#endif
1667 return false;
1668}
1669
1670static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1671{
1672#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1673 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1674 int ret = 0;
1675
1676 if (!(svc->conntrack_afmask & afmask)) {
1677 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1678 if (ret >= 0)
1679 svc->conntrack_afmask |= afmask;
1680 }
1681 return ret;
1682#else
1683 return 0;
1684#endif
1685}
1686
1687static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1688{
1689#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1690 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1691
1692 if (svc->conntrack_afmask & afmask) {
1693 nf_ct_netns_put(svc->ipvs->net, svc->af);
1694 svc->conntrack_afmask &= ~afmask;
1695 }
1696#endif
1697}
1698
1699int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1700void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1701
1702static inline int
1703ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1704{
1705 /* We think the overhead of processing active connections is 256
1706 * times higher than that of inactive connections in average. (This
1707 * 256 times might not be accurate, we will change it later) We
1708 * use the following formula to estimate the overhead now:
1709 * dest->activeconns*256 + dest->inactconns
1710 */
1711 return (atomic_read(&dest->activeconns) << 8) +
1712 atomic_read(&dest->inactconns);
1713}
1714
1715#ifdef CONFIG_IP_VS_PROTO_TCP
1716INDIRECT_CALLABLE_DECLARE(int
1717 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1718 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1719#endif
1720
1721#ifdef CONFIG_IP_VS_PROTO_UDP
1722INDIRECT_CALLABLE_DECLARE(int
1723 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1724 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1725#endif
1726#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_NF_CONNTRACK)
29#include <net/netfilter/nf_conntrack.h>
30#endif
31#include <net/net_namespace.h> /* Netw namespace */
32#include <linux/sched/isolation.h>
33
34#define IP_VS_HDR_INVERSE 1
35#define IP_VS_HDR_ICMP 2
36
37/* Generic access of ipvs struct */
38static inline struct netns_ipvs *net_ipvs(struct net* net)
39{
40 return net->ipvs;
41}
42
43/* Connections' size value needed by ip_vs_ctl.c */
44extern int ip_vs_conn_tab_size;
45
46extern struct mutex __ip_vs_mutex;
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_stats_t conns; /* connections scheduled */
358 u64_stats_t inpkts; /* incoming packets */
359 u64_stats_t outpkts; /* outgoing packets */
360 u64_stats_t inbytes; /* incoming bytes */
361 u64_stats_t 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/* Default nice for estimator kthreads */
370#define IPVS_EST_NICE 0
371
372/* IPVS statistics objects */
373struct ip_vs_estimator {
374 struct hlist_node list;
375
376 u64 last_inbytes;
377 u64 last_outbytes;
378 u64 last_conns;
379 u64 last_inpkts;
380 u64 last_outpkts;
381
382 u64 cps;
383 u64 inpps;
384 u64 outpps;
385 u64 inbps;
386 u64 outbps;
387
388 s32 ktid:16, /* kthread ID, -1=temp list */
389 ktrow:8, /* row/tick ID for kthread */
390 ktcid:8; /* chain ID for kthread tick */
391};
392
393/*
394 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
395 */
396struct ip_vs_kstats {
397 u64 conns; /* connections scheduled */
398 u64 inpkts; /* incoming packets */
399 u64 outpkts; /* outgoing packets */
400 u64 inbytes; /* incoming bytes */
401 u64 outbytes; /* outgoing bytes */
402
403 u64 cps; /* current connection rate */
404 u64 inpps; /* current in packet rate */
405 u64 outpps; /* current out packet rate */
406 u64 inbps; /* current in byte rate */
407 u64 outbps; /* current out byte rate */
408};
409
410struct ip_vs_stats {
411 struct ip_vs_kstats kstats; /* kernel statistics */
412 struct ip_vs_estimator est; /* estimator */
413 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
414 spinlock_t lock; /* spin lock */
415 struct ip_vs_kstats kstats0; /* reset values */
416};
417
418struct ip_vs_stats_rcu {
419 struct ip_vs_stats s;
420 struct rcu_head rcu_head;
421};
422
423int ip_vs_stats_init_alloc(struct ip_vs_stats *s);
424struct ip_vs_stats *ip_vs_stats_alloc(void);
425void ip_vs_stats_release(struct ip_vs_stats *stats);
426void ip_vs_stats_free(struct ip_vs_stats *stats);
427
428/* Process estimators in multiple timer ticks (20/50/100, see ktrow) */
429#define IPVS_EST_NTICKS 50
430/* Estimation uses a 2-second period containing ticks (in jiffies) */
431#define IPVS_EST_TICK ((2 * HZ) / IPVS_EST_NTICKS)
432
433/* Limit of CPU load per kthread (8 for 12.5%), ratio of CPU capacity (1/C).
434 * Value of 4 and above ensures kthreads will take work without exceeding
435 * the CPU capacity under different circumstances.
436 */
437#define IPVS_EST_LOAD_DIVISOR 8
438
439/* Kthreads should not have work that exceeds the CPU load above 50% */
440#define IPVS_EST_CPU_KTHREADS (IPVS_EST_LOAD_DIVISOR / 2)
441
442/* Desired number of chains per timer tick (chain load factor in 100us units),
443 * 48=4.8ms of 40ms tick (12% CPU usage):
444 * 2 sec * 1000 ms in sec * 10 (100us in ms) / 8 (12.5%) / 50
445 */
446#define IPVS_EST_CHAIN_FACTOR \
447 ALIGN_DOWN(2 * 1000 * 10 / IPVS_EST_LOAD_DIVISOR / IPVS_EST_NTICKS, 8)
448
449/* Compiled number of chains per tick
450 * The defines should match cond_resched_rcu
451 */
452#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
453#define IPVS_EST_TICK_CHAINS IPVS_EST_CHAIN_FACTOR
454#else
455#define IPVS_EST_TICK_CHAINS 1
456#endif
457
458#if IPVS_EST_NTICKS > 127
459#error Too many timer ticks for ktrow
460#endif
461
462/* Multiple chains processed in same tick */
463struct ip_vs_est_tick_data {
464 struct hlist_head chains[IPVS_EST_TICK_CHAINS];
465 DECLARE_BITMAP(present, IPVS_EST_TICK_CHAINS);
466 DECLARE_BITMAP(full, IPVS_EST_TICK_CHAINS);
467 int chain_len[IPVS_EST_TICK_CHAINS];
468};
469
470/* Context for estimation kthread */
471struct ip_vs_est_kt_data {
472 struct netns_ipvs *ipvs;
473 struct task_struct *task; /* task if running */
474 struct ip_vs_est_tick_data __rcu *ticks[IPVS_EST_NTICKS];
475 DECLARE_BITMAP(avail, IPVS_EST_NTICKS); /* tick has space for ests */
476 unsigned long est_timer; /* estimation timer (jiffies) */
477 struct ip_vs_stats *calc_stats; /* Used for calculation */
478 int tick_len[IPVS_EST_NTICKS]; /* est count */
479 int id; /* ktid per netns */
480 int chain_max; /* max ests per tick chain */
481 int tick_max; /* max ests per tick */
482 int est_count; /* attached ests to kthread */
483 int est_max_count; /* max ests per kthread */
484 int add_row; /* row for new ests */
485 int est_row; /* estimated row */
486};
487
488struct dst_entry;
489struct iphdr;
490struct ip_vs_conn;
491struct ip_vs_app;
492struct sk_buff;
493struct ip_vs_proto_data;
494
495struct ip_vs_protocol {
496 struct ip_vs_protocol *next;
497 char *name;
498 u16 protocol;
499 u16 num_states;
500 int dont_defrag;
501
502 void (*init)(struct ip_vs_protocol *pp);
503
504 void (*exit)(struct ip_vs_protocol *pp);
505
506 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
507
508 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
509
510 int (*conn_schedule)(struct netns_ipvs *ipvs,
511 int af, struct sk_buff *skb,
512 struct ip_vs_proto_data *pd,
513 int *verdict, struct ip_vs_conn **cpp,
514 struct ip_vs_iphdr *iph);
515
516 struct ip_vs_conn *
517 (*conn_in_get)(struct netns_ipvs *ipvs,
518 int af,
519 const struct sk_buff *skb,
520 const struct ip_vs_iphdr *iph);
521
522 struct ip_vs_conn *
523 (*conn_out_get)(struct netns_ipvs *ipvs,
524 int af,
525 const struct sk_buff *skb,
526 const struct ip_vs_iphdr *iph);
527
528 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
529 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
530
531 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
532 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
533
534 const char *(*state_name)(int state);
535
536 void (*state_transition)(struct ip_vs_conn *cp, int direction,
537 const struct sk_buff *skb,
538 struct ip_vs_proto_data *pd);
539
540 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
541
542 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
543
544 int (*app_conn_bind)(struct ip_vs_conn *cp);
545
546 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
547 const struct sk_buff *skb,
548 int offset,
549 const char *msg);
550
551 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
552};
553
554/* protocol data per netns */
555struct ip_vs_proto_data {
556 struct ip_vs_proto_data *next;
557 struct ip_vs_protocol *pp;
558 int *timeout_table; /* protocol timeout table */
559 atomic_t appcnt; /* counter of proto app incs. */
560 struct tcp_states_t *tcp_state_table;
561};
562
563struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
564struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
565 unsigned short proto);
566
567struct ip_vs_conn_param {
568 struct netns_ipvs *ipvs;
569 const union nf_inet_addr *caddr;
570 const union nf_inet_addr *vaddr;
571 __be16 cport;
572 __be16 vport;
573 __u16 protocol;
574 u16 af;
575
576 const struct ip_vs_pe *pe;
577 char *pe_data;
578 __u8 pe_data_len;
579};
580
581/* IP_VS structure allocated for each dynamically scheduled connection */
582struct ip_vs_conn {
583 struct hlist_node c_list; /* hashed list heads */
584 /* Protocol, addresses and port numbers */
585 __be16 cport;
586 __be16 dport;
587 __be16 vport;
588 u16 af; /* address family */
589 union nf_inet_addr caddr; /* client address */
590 union nf_inet_addr vaddr; /* virtual address */
591 union nf_inet_addr daddr; /* destination address */
592 volatile __u32 flags; /* status flags */
593 __u16 protocol; /* Which protocol (TCP/UDP) */
594 __u16 daf; /* Address family of the dest */
595 struct netns_ipvs *ipvs;
596
597 /* counter and timer */
598 refcount_t refcnt; /* reference count */
599 struct timer_list timer; /* Expiration timer */
600 volatile unsigned long timeout; /* timeout */
601
602 /* Flags and state transition */
603 spinlock_t lock; /* lock for state transition */
604 volatile __u16 state; /* state info */
605 volatile __u16 old_state; /* old state, to be used for
606 * state transition triggerd
607 * synchronization
608 */
609 __u32 fwmark; /* Fire wall mark from skb */
610 unsigned long sync_endtime; /* jiffies + sent_retries */
611
612 /* Control members */
613 struct ip_vs_conn *control; /* Master control connection */
614 atomic_t n_control; /* Number of controlled ones */
615 struct ip_vs_dest *dest; /* real server */
616 atomic_t in_pkts; /* incoming packet counter */
617
618 /* Packet transmitter for different forwarding methods. If it
619 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
620 * otherwise this must be changed to a sk_buff **.
621 * NF_ACCEPT can be returned when destination is local.
622 */
623 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
624 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
625
626 /* Note: we can group the following members into a structure,
627 * in order to save more space, and the following members are
628 * only used in VS/NAT anyway
629 */
630 struct ip_vs_app *app; /* bound ip_vs_app object */
631 void *app_data; /* Application private data */
632 struct ip_vs_seq in_seq; /* incoming seq. struct */
633 struct ip_vs_seq out_seq; /* outgoing seq. struct */
634
635 const struct ip_vs_pe *pe;
636 char *pe_data;
637 __u8 pe_data_len;
638
639 struct rcu_head rcu_head;
640};
641
642/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
643 * for IPv6 support.
644 *
645 * We need these to conveniently pass around service and destination
646 * options, but unfortunately, we also need to keep the old definitions to
647 * maintain userspace backwards compatibility for the setsockopt interface.
648 */
649struct ip_vs_service_user_kern {
650 /* virtual service addresses */
651 u16 af;
652 u16 protocol;
653 union nf_inet_addr addr; /* virtual ip address */
654 __be16 port;
655 u32 fwmark; /* firwall mark of service */
656
657 /* virtual service options */
658 char *sched_name;
659 char *pe_name;
660 unsigned int flags; /* virtual service flags */
661 unsigned int timeout; /* persistent timeout in sec */
662 __be32 netmask; /* persistent netmask or plen */
663};
664
665
666struct ip_vs_dest_user_kern {
667 /* destination server address */
668 union nf_inet_addr addr;
669 __be16 port;
670
671 /* real server options */
672 unsigned int conn_flags; /* connection flags */
673 int weight; /* destination weight */
674
675 /* thresholds for active connections */
676 u32 u_threshold; /* upper threshold */
677 u32 l_threshold; /* lower threshold */
678
679 /* Address family of addr */
680 u16 af;
681
682 u16 tun_type; /* tunnel type */
683 __be16 tun_port; /* tunnel port */
684 u16 tun_flags; /* tunnel flags */
685};
686
687
688/*
689 * The information about the virtual service offered to the net and the
690 * forwarding entries.
691 */
692struct ip_vs_service {
693 struct hlist_node s_list; /* for normal service table */
694 struct hlist_node f_list; /* for fwmark-based service table */
695 atomic_t refcnt; /* reference counter */
696
697 u16 af; /* address family */
698 __u16 protocol; /* which protocol (TCP/UDP) */
699 union nf_inet_addr addr; /* IP address for virtual service */
700 __be16 port; /* port number for the service */
701 __u32 fwmark; /* firewall mark of the service */
702 unsigned int flags; /* service status flags */
703 unsigned int timeout; /* persistent timeout in ticks */
704 __be32 netmask; /* grouping granularity, mask/plen */
705 struct netns_ipvs *ipvs;
706
707 struct list_head destinations; /* real server d-linked list */
708 __u32 num_dests; /* number of servers */
709 struct ip_vs_stats stats; /* statistics for the service */
710
711 /* for scheduling */
712 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
713 spinlock_t sched_lock; /* lock sched_data */
714 void *sched_data; /* scheduler application data */
715
716 /* alternate persistence engine */
717 struct ip_vs_pe __rcu *pe;
718 int conntrack_afmask;
719
720 struct rcu_head rcu_head;
721};
722
723/* Information for cached dst */
724struct ip_vs_dest_dst {
725 struct dst_entry *dst_cache; /* destination cache entry */
726 u32 dst_cookie;
727 union nf_inet_addr dst_saddr;
728 struct rcu_head rcu_head;
729};
730
731/* The real server destination forwarding entry with ip address, port number,
732 * and so on.
733 */
734struct ip_vs_dest {
735 struct list_head n_list; /* for the dests in the service */
736 struct hlist_node d_list; /* for table with all the dests */
737
738 u16 af; /* address family */
739 __be16 port; /* port number of the server */
740 union nf_inet_addr addr; /* IP address of the server */
741 volatile unsigned int flags; /* dest status flags */
742 atomic_t conn_flags; /* flags to copy to conn */
743 atomic_t weight; /* server weight */
744 atomic_t last_weight; /* server latest weight */
745 __u16 tun_type; /* tunnel type */
746 __be16 tun_port; /* tunnel port */
747 __u16 tun_flags; /* tunnel flags */
748
749 refcount_t refcnt; /* reference counter */
750 struct ip_vs_stats stats; /* statistics */
751 unsigned long idle_start; /* start time, jiffies */
752
753 /* connection counters and thresholds */
754 atomic_t activeconns; /* active connections */
755 atomic_t inactconns; /* inactive connections */
756 atomic_t persistconns; /* persistent connections */
757 __u32 u_threshold; /* upper threshold */
758 __u32 l_threshold; /* lower threshold */
759
760 /* for destination cache */
761 spinlock_t dst_lock; /* lock of dst_cache */
762 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
763
764 /* for virtual service */
765 struct ip_vs_service __rcu *svc; /* service it belongs to */
766 __u16 protocol; /* which protocol (TCP/UDP) */
767 __be16 vport; /* virtual port number */
768 union nf_inet_addr vaddr; /* virtual IP address */
769 __u32 vfwmark; /* firewall mark of service */
770
771 struct rcu_head rcu_head;
772 struct list_head t_list; /* in dest_trash */
773 unsigned int in_rs_table:1; /* we are in rs_table */
774};
775
776/* The scheduler object */
777struct ip_vs_scheduler {
778 struct list_head n_list; /* d-linked list head */
779 char *name; /* scheduler name */
780 atomic_t refcnt; /* reference counter */
781 struct module *module; /* THIS_MODULE/NULL */
782
783 /* scheduler initializing service */
784 int (*init_service)(struct ip_vs_service *svc);
785 /* scheduling service finish */
786 void (*done_service)(struct ip_vs_service *svc);
787 /* dest is linked */
788 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
789 /* dest is unlinked */
790 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
791 /* dest is updated */
792 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
793
794 /* selecting a server from the given service */
795 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
796 const struct sk_buff *skb,
797 struct ip_vs_iphdr *iph);
798};
799
800/* The persistence engine object */
801struct ip_vs_pe {
802 struct list_head n_list; /* d-linked list head */
803 char *name; /* scheduler name */
804 atomic_t refcnt; /* reference counter */
805 struct module *module; /* THIS_MODULE/NULL */
806
807 /* get the connection template, if any */
808 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
809 bool (*ct_match)(const struct ip_vs_conn_param *p,
810 struct ip_vs_conn *ct);
811 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
812 bool inverse);
813 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
814 /* create connections for real-server outgoing packets */
815 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
816 struct ip_vs_dest *dest,
817 struct sk_buff *skb,
818 const struct ip_vs_iphdr *iph,
819 __be16 dport, __be16 cport);
820};
821
822/* The application module object (a.k.a. app incarnation) */
823struct ip_vs_app {
824 struct list_head a_list; /* member in app list */
825 int type; /* IP_VS_APP_TYPE_xxx */
826 char *name; /* application module name */
827 __u16 protocol;
828 struct module *module; /* THIS_MODULE/NULL */
829 struct list_head incs_list; /* list of incarnations */
830
831 /* members for application incarnations */
832 struct list_head p_list; /* member in proto app list */
833 struct ip_vs_app *app; /* its real application */
834 __be16 port; /* port number in net order */
835 atomic_t usecnt; /* usage counter */
836 struct rcu_head rcu_head;
837
838 /* output hook: Process packet in inout direction, diff set for TCP.
839 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
840 * 2=Mangled but checksum was not updated
841 */
842 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
843 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
844
845 /* input hook: Process packet in outin direction, diff set for TCP.
846 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
847 * 2=Mangled but checksum was not updated
848 */
849 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
850 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
851
852 /* ip_vs_app initializer */
853 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
854
855 /* ip_vs_app finish */
856 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
857
858
859 /* not used now */
860 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
861 struct ip_vs_protocol *);
862
863 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
864
865 int * timeout_table;
866 int * timeouts;
867 int timeouts_size;
868
869 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
870 int *verdict, struct ip_vs_conn **cpp);
871
872 struct ip_vs_conn *
873 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
874 const struct iphdr *iph, int inverse);
875
876 struct ip_vs_conn *
877 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
878 const struct iphdr *iph, int inverse);
879
880 int (*state_transition)(struct ip_vs_conn *cp, int direction,
881 const struct sk_buff *skb,
882 struct ip_vs_app *app);
883
884 void (*timeout_change)(struct ip_vs_app *app, int flags);
885};
886
887struct ipvs_master_sync_state {
888 struct list_head sync_queue;
889 struct ip_vs_sync_buff *sync_buff;
890 unsigned long sync_queue_len;
891 unsigned int sync_queue_delay;
892 struct delayed_work master_wakeup_work;
893 struct netns_ipvs *ipvs;
894};
895
896struct ip_vs_sync_thread_data;
897
898/* How much time to keep dests in trash */
899#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
900
901struct ipvs_sync_daemon_cfg {
902 union nf_inet_addr mcast_group;
903 int syncid;
904 u16 sync_maxlen;
905 u16 mcast_port;
906 u8 mcast_af;
907 u8 mcast_ttl;
908 /* multicast interface name */
909 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
910};
911
912/* IPVS in network namespace */
913struct netns_ipvs {
914 int gen; /* Generation */
915 int enable; /* enable like nf_hooks do */
916 /* Hash table: for real service lookups */
917 #define IP_VS_RTAB_BITS 4
918 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
919 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
920
921 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
922 /* ip_vs_app */
923 struct list_head app_list;
924 /* ip_vs_proto */
925 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
926 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
927 /* ip_vs_proto_tcp */
928#ifdef CONFIG_IP_VS_PROTO_TCP
929 #define TCP_APP_TAB_BITS 4
930 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
931 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
932 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
933#endif
934 /* ip_vs_proto_udp */
935#ifdef CONFIG_IP_VS_PROTO_UDP
936 #define UDP_APP_TAB_BITS 4
937 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
938 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
939 struct list_head udp_apps[UDP_APP_TAB_SIZE];
940#endif
941 /* ip_vs_proto_sctp */
942#ifdef CONFIG_IP_VS_PROTO_SCTP
943 #define SCTP_APP_TAB_BITS 4
944 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
945 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
946 /* Hash table for SCTP application incarnations */
947 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
948#endif
949 /* ip_vs_conn */
950 atomic_t conn_count; /* connection counter */
951
952 /* ip_vs_ctl */
953 struct ip_vs_stats_rcu *tot_stats; /* Statistics & est. */
954
955 int num_services; /* no of virtual services */
956 int num_services6; /* IPv6 virtual services */
957
958 /* Trash for destinations */
959 struct list_head dest_trash;
960 spinlock_t dest_trash_lock;
961 struct timer_list dest_trash_timer; /* expiration timer */
962 /* Service counters */
963 atomic_t ftpsvc_counter;
964 atomic_t nullsvc_counter;
965 atomic_t conn_out_counter;
966
967#ifdef CONFIG_SYSCTL
968 /* delayed work for expiring no dest connections */
969 struct delayed_work expire_nodest_conn_work;
970 /* 1/rate drop and drop-entry variables */
971 struct delayed_work defense_work; /* Work handler */
972 int drop_rate;
973 int drop_counter;
974 int old_secure_tcp;
975 atomic_t dropentry;
976 /* locks in ctl.c */
977 spinlock_t dropentry_lock; /* drop entry handling */
978 spinlock_t droppacket_lock; /* drop packet handling */
979 spinlock_t securetcp_lock; /* state and timeout tables */
980
981 /* sys-ctl struct */
982 struct ctl_table_header *sysctl_hdr;
983 struct ctl_table *sysctl_tbl;
984#endif
985
986 /* sysctl variables */
987 int sysctl_amemthresh;
988 int sysctl_am_droprate;
989 int sysctl_drop_entry;
990 int sysctl_drop_packet;
991 int sysctl_secure_tcp;
992#ifdef CONFIG_IP_VS_NFCT
993 int sysctl_conntrack;
994#endif
995 int sysctl_snat_reroute;
996 int sysctl_sync_ver;
997 int sysctl_sync_ports;
998 int sysctl_sync_persist_mode;
999 unsigned long sysctl_sync_qlen_max;
1000 int sysctl_sync_sock_size;
1001 int sysctl_cache_bypass;
1002 int sysctl_expire_nodest_conn;
1003 int sysctl_sloppy_tcp;
1004 int sysctl_sloppy_sctp;
1005 int sysctl_expire_quiescent_template;
1006 int sysctl_sync_threshold[2];
1007 unsigned int sysctl_sync_refresh_period;
1008 int sysctl_sync_retries;
1009 int sysctl_nat_icmp_send;
1010 int sysctl_pmtu_disc;
1011 int sysctl_backup_only;
1012 int sysctl_conn_reuse_mode;
1013 int sysctl_schedule_icmp;
1014 int sysctl_ignore_tunneled;
1015 int sysctl_run_estimation;
1016#ifdef CONFIG_SYSCTL
1017 cpumask_var_t sysctl_est_cpulist; /* kthread cpumask */
1018 int est_cpulist_valid; /* cpulist set */
1019 int sysctl_est_nice; /* kthread nice */
1020 int est_stopped; /* stop tasks */
1021#endif
1022
1023 /* ip_vs_lblc */
1024 int sysctl_lblc_expiration;
1025 struct ctl_table_header *lblc_ctl_header;
1026 struct ctl_table *lblc_ctl_table;
1027 /* ip_vs_lblcr */
1028 int sysctl_lblcr_expiration;
1029 struct ctl_table_header *lblcr_ctl_header;
1030 struct ctl_table *lblcr_ctl_table;
1031 /* ip_vs_est */
1032 struct delayed_work est_reload_work;/* Reload kthread tasks */
1033 struct mutex est_mutex; /* protect kthread tasks */
1034 struct hlist_head est_temp_list; /* Ests during calc phase */
1035 struct ip_vs_est_kt_data **est_kt_arr; /* Array of kthread data ptrs */
1036 unsigned long est_max_threads;/* Hard limit of kthreads */
1037 int est_calc_phase; /* Calculation phase */
1038 int est_chain_max; /* Calculated chain_max */
1039 int est_kt_count; /* Allocated ptrs */
1040 int est_add_ktid; /* ktid where to add ests */
1041 atomic_t est_genid; /* kthreads reload genid */
1042 atomic_t est_genid_done; /* applied genid */
1043 /* ip_vs_sync */
1044 spinlock_t sync_lock;
1045 struct ipvs_master_sync_state *ms;
1046 spinlock_t sync_buff_lock;
1047 struct ip_vs_sync_thread_data *master_tinfo;
1048 struct ip_vs_sync_thread_data *backup_tinfo;
1049 int threads_mask;
1050 volatile int sync_state;
1051 struct mutex sync_mutex;
1052 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
1053 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
1054 /* net name space ptr */
1055 struct net *net; /* Needed by timer routines */
1056 /* Number of heterogeneous destinations, needed becaus heterogeneous
1057 * are not supported when synchronization is enabled.
1058 */
1059 unsigned int mixed_address_family_dests;
1060 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
1061};
1062
1063#define DEFAULT_SYNC_THRESHOLD 3
1064#define DEFAULT_SYNC_PERIOD 50
1065#define DEFAULT_SYNC_VER 1
1066#define DEFAULT_SLOPPY_TCP 0
1067#define DEFAULT_SLOPPY_SCTP 0
1068#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
1069#define DEFAULT_SYNC_RETRIES 0
1070#define IPVS_SYNC_WAKEUP_RATE 8
1071#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1072#define IPVS_SYNC_SEND_DELAY (HZ / 50)
1073#define IPVS_SYNC_CHECK_PERIOD HZ
1074#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1075#define IPVS_SYNC_PORTS_MAX (1 << 6)
1076
1077#ifdef CONFIG_SYSCTL
1078
1079static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1080{
1081 return ipvs->sysctl_sync_threshold[0];
1082}
1083
1084static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1085{
1086 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
1087}
1088
1089static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1090{
1091 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
1092}
1093
1094static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1095{
1096 return ipvs->sysctl_sync_retries;
1097}
1098
1099static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1100{
1101 return ipvs->sysctl_sync_ver;
1102}
1103
1104static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1105{
1106 return ipvs->sysctl_sloppy_tcp;
1107}
1108
1109static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1110{
1111 return ipvs->sysctl_sloppy_sctp;
1112}
1113
1114static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1115{
1116 return READ_ONCE(ipvs->sysctl_sync_ports);
1117}
1118
1119static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1120{
1121 return ipvs->sysctl_sync_persist_mode;
1122}
1123
1124static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1125{
1126 return ipvs->sysctl_sync_qlen_max;
1127}
1128
1129static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1130{
1131 return ipvs->sysctl_sync_sock_size;
1132}
1133
1134static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1135{
1136 return ipvs->sysctl_pmtu_disc;
1137}
1138
1139static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1140{
1141 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1142 ipvs->sysctl_backup_only;
1143}
1144
1145static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1146{
1147 return ipvs->sysctl_conn_reuse_mode;
1148}
1149
1150static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1151{
1152 return ipvs->sysctl_expire_nodest_conn;
1153}
1154
1155static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1156{
1157 return ipvs->sysctl_schedule_icmp;
1158}
1159
1160static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1161{
1162 return ipvs->sysctl_ignore_tunneled;
1163}
1164
1165static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1166{
1167 return ipvs->sysctl_cache_bypass;
1168}
1169
1170static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1171{
1172 return ipvs->sysctl_run_estimation;
1173}
1174
1175static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
1176{
1177 if (ipvs->est_cpulist_valid)
1178 return ipvs->sysctl_est_cpulist;
1179 else
1180 return housekeeping_cpumask(HK_TYPE_KTHREAD);
1181}
1182
1183static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1184{
1185 return ipvs->sysctl_est_nice;
1186}
1187
1188#else
1189
1190static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1191{
1192 return DEFAULT_SYNC_THRESHOLD;
1193}
1194
1195static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1196{
1197 return DEFAULT_SYNC_PERIOD;
1198}
1199
1200static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1201{
1202 return DEFAULT_SYNC_REFRESH_PERIOD;
1203}
1204
1205static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1206{
1207 return DEFAULT_SYNC_RETRIES & 3;
1208}
1209
1210static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1211{
1212 return DEFAULT_SYNC_VER;
1213}
1214
1215static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1216{
1217 return DEFAULT_SLOPPY_TCP;
1218}
1219
1220static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1221{
1222 return DEFAULT_SLOPPY_SCTP;
1223}
1224
1225static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1226{
1227 return 1;
1228}
1229
1230static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1231{
1232 return 0;
1233}
1234
1235static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1236{
1237 return IPVS_SYNC_QLEN_MAX;
1238}
1239
1240static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1241{
1242 return 0;
1243}
1244
1245static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1246{
1247 return 1;
1248}
1249
1250static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1251{
1252 return 0;
1253}
1254
1255static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1256{
1257 return 1;
1258}
1259
1260static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1261{
1262 return 0;
1263}
1264
1265static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1266{
1267 return 0;
1268}
1269
1270static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1271{
1272 return 0;
1273}
1274
1275static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1276{
1277 return 0;
1278}
1279
1280static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1281{
1282 return 1;
1283}
1284
1285static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
1286{
1287 return housekeeping_cpumask(HK_TYPE_KTHREAD);
1288}
1289
1290static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1291{
1292 return IPVS_EST_NICE;
1293}
1294
1295#endif
1296
1297/* IPVS core functions
1298 * (from ip_vs_core.c)
1299 */
1300const char *ip_vs_proto_name(unsigned int proto);
1301void ip_vs_init_hash_table(struct list_head *table, int rows);
1302struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1303 struct ip_vs_dest *dest,
1304 struct sk_buff *skb,
1305 const struct ip_vs_iphdr *iph,
1306 __be16 dport,
1307 __be16 cport);
1308#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1309
1310#define IP_VS_APP_TYPE_FTP 1
1311
1312/* ip_vs_conn handling functions
1313 * (from ip_vs_conn.c)
1314 */
1315enum {
1316 IP_VS_DIR_INPUT = 0,
1317 IP_VS_DIR_OUTPUT,
1318 IP_VS_DIR_INPUT_ONLY,
1319 IP_VS_DIR_LAST,
1320};
1321
1322static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1323 const union nf_inet_addr *caddr,
1324 __be16 cport,
1325 const union nf_inet_addr *vaddr,
1326 __be16 vport,
1327 struct ip_vs_conn_param *p)
1328{
1329 p->ipvs = ipvs;
1330 p->af = af;
1331 p->protocol = protocol;
1332 p->caddr = caddr;
1333 p->cport = cport;
1334 p->vaddr = vaddr;
1335 p->vport = vport;
1336 p->pe = NULL;
1337 p->pe_data = NULL;
1338}
1339
1340struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1341struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1342
1343struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1344 const struct sk_buff *skb,
1345 const struct ip_vs_iphdr *iph);
1346
1347struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1348
1349struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1350 const struct sk_buff *skb,
1351 const struct ip_vs_iphdr *iph);
1352
1353/* Get reference to gain full access to conn.
1354 * By default, RCU read-side critical sections have access only to
1355 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1356 */
1357static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1358{
1359 return refcount_inc_not_zero(&cp->refcnt);
1360}
1361
1362/* put back the conn without restarting its timer */
1363static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1364{
1365 smp_mb__before_atomic();
1366 refcount_dec(&cp->refcnt);
1367}
1368void ip_vs_conn_put(struct ip_vs_conn *cp);
1369void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1370
1371struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1372 const union nf_inet_addr *daddr,
1373 __be16 dport, unsigned int flags,
1374 struct ip_vs_dest *dest, __u32 fwmark);
1375void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1376
1377const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1378
1379void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1380int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1381void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1382int ip_vs_conn_init(void);
1383void ip_vs_conn_cleanup(void);
1384
1385static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1386{
1387 struct ip_vs_conn *ctl_cp = cp->control;
1388 if (!ctl_cp) {
1389 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1390 "%s:%d to %s:%d\n",
1391 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1392 ntohs(cp->cport),
1393 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1394 ntohs(cp->vport));
1395
1396 return;
1397 }
1398
1399 IP_VS_DBG_BUF(7, "DELeting control for: "
1400 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1401 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1402 ntohs(cp->cport),
1403 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1404 ntohs(ctl_cp->cport));
1405
1406 cp->control = NULL;
1407 if (atomic_read(&ctl_cp->n_control) == 0) {
1408 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1409 "%s:%d to %s:%d\n",
1410 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1411 ntohs(cp->cport),
1412 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1413 ntohs(cp->vport));
1414
1415 return;
1416 }
1417 atomic_dec(&ctl_cp->n_control);
1418}
1419
1420static inline void
1421ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1422{
1423 if (cp->control) {
1424 IP_VS_ERR_BUF("request control ADD for already controlled: "
1425 "%s:%d to %s:%d\n",
1426 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1427 ntohs(cp->cport),
1428 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1429 ntohs(cp->vport));
1430
1431 ip_vs_control_del(cp);
1432 }
1433
1434 IP_VS_DBG_BUF(7, "ADDing control for: "
1435 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1436 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1437 ntohs(cp->cport),
1438 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1439 ntohs(ctl_cp->cport));
1440
1441 cp->control = ctl_cp;
1442 atomic_inc(&ctl_cp->n_control);
1443}
1444
1445/* Mark our template as assured */
1446static inline void
1447ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1448{
1449 struct ip_vs_conn *ct = cp->control;
1450
1451 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1452 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1453 ct->state |= IP_VS_CTPL_S_ASSURED;
1454}
1455
1456/* IPVS netns init & cleanup functions */
1457int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1458int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1459int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1460int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1461int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1462int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1463void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1464void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1465void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1466void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1467void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1468void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1469void ip_vs_service_nets_cleanup(struct list_head *net_list);
1470
1471/* IPVS application functions
1472 * (from ip_vs_app.c)
1473 */
1474#define IP_VS_APP_MAX_PORTS 8
1475struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1476void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1477int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1478void ip_vs_unbind_app(struct ip_vs_conn *cp);
1479int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1480 __u16 port);
1481int ip_vs_app_inc_get(struct ip_vs_app *inc);
1482void ip_vs_app_inc_put(struct ip_vs_app *inc);
1483
1484int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1485 struct ip_vs_iphdr *ipvsh);
1486int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1487 struct ip_vs_iphdr *ipvsh);
1488
1489int register_ip_vs_pe(struct ip_vs_pe *pe);
1490int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1491struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1492struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1493
1494/* Use a #define to avoid all of module.h just for these trivial ops */
1495#define ip_vs_pe_get(pe) \
1496 if (pe && pe->module) \
1497 __module_get(pe->module);
1498
1499#define ip_vs_pe_put(pe) \
1500 if (pe && pe->module) \
1501 module_put(pe->module);
1502
1503/* IPVS protocol functions (from ip_vs_proto.c) */
1504int ip_vs_protocol_init(void);
1505void ip_vs_protocol_cleanup(void);
1506void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1507int *ip_vs_create_timeout_table(int *table, int size);
1508void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1509 const struct sk_buff *skb, int offset,
1510 const char *msg);
1511
1512extern struct ip_vs_protocol ip_vs_protocol_tcp;
1513extern struct ip_vs_protocol ip_vs_protocol_udp;
1514extern struct ip_vs_protocol ip_vs_protocol_icmp;
1515extern struct ip_vs_protocol ip_vs_protocol_esp;
1516extern struct ip_vs_protocol ip_vs_protocol_ah;
1517extern struct ip_vs_protocol ip_vs_protocol_sctp;
1518
1519/* Registering/unregistering scheduler functions
1520 * (from ip_vs_sched.c)
1521 */
1522int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1523int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1524int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1525 struct ip_vs_scheduler *scheduler);
1526void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1527 struct ip_vs_scheduler *sched);
1528struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1529void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1530struct ip_vs_conn *
1531ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1532 struct ip_vs_proto_data *pd, int *ignored,
1533 struct ip_vs_iphdr *iph);
1534int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1535 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1536
1537void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1538
1539/* IPVS control data and functions (from ip_vs_ctl.c) */
1540extern struct ip_vs_stats ip_vs_stats;
1541extern int sysctl_ip_vs_sync_ver;
1542
1543struct ip_vs_service *
1544ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1545 const union nf_inet_addr *vaddr, __be16 vport);
1546
1547bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1548 const union nf_inet_addr *daddr, __be16 dport);
1549
1550struct ip_vs_dest *
1551ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1552 const union nf_inet_addr *daddr, __be16 dport);
1553struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1554 const union nf_inet_addr *daddr,
1555 __be16 tun_port);
1556
1557int ip_vs_use_count_inc(void);
1558void ip_vs_use_count_dec(void);
1559int ip_vs_register_nl_ioctl(void);
1560void ip_vs_unregister_nl_ioctl(void);
1561int ip_vs_control_init(void);
1562void ip_vs_control_cleanup(void);
1563struct ip_vs_dest *
1564ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1565 const union nf_inet_addr *daddr, __be16 dport,
1566 const union nf_inet_addr *vaddr, __be16 vport,
1567 __u16 protocol, __u32 fwmark, __u32 flags);
1568void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1569
1570static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1571{
1572 refcount_inc(&dest->refcnt);
1573}
1574
1575static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1576{
1577 smp_mb__before_atomic();
1578 refcount_dec(&dest->refcnt);
1579}
1580
1581static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1582{
1583 if (refcount_dec_and_test(&dest->refcnt))
1584 kfree(dest);
1585}
1586
1587/* IPVS sync daemon data and function prototypes
1588 * (from ip_vs_sync.c)
1589 */
1590int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1591 int state);
1592int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1593void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1594
1595/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1596int ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1597void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1598void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1599void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1600void ip_vs_est_reload_start(struct netns_ipvs *ipvs);
1601int ip_vs_est_kthread_start(struct netns_ipvs *ipvs,
1602 struct ip_vs_est_kt_data *kd);
1603void ip_vs_est_kthread_stop(struct ip_vs_est_kt_data *kd);
1604
1605static inline void ip_vs_est_stopped_recalc(struct netns_ipvs *ipvs)
1606{
1607#ifdef CONFIG_SYSCTL
1608 /* Stop tasks while cpulist is empty or if disabled with flag */
1609 ipvs->est_stopped = !sysctl_run_estimation(ipvs) ||
1610 (ipvs->est_cpulist_valid &&
1611 cpumask_empty(sysctl_est_cpulist(ipvs)));
1612#endif
1613}
1614
1615static inline bool ip_vs_est_stopped(struct netns_ipvs *ipvs)
1616{
1617#ifdef CONFIG_SYSCTL
1618 return ipvs->est_stopped;
1619#else
1620 return false;
1621#endif
1622}
1623
1624static inline int ip_vs_est_max_threads(struct netns_ipvs *ipvs)
1625{
1626 unsigned int limit = IPVS_EST_CPU_KTHREADS *
1627 cpumask_weight(sysctl_est_cpulist(ipvs));
1628
1629 return max(1U, limit);
1630}
1631
1632/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1633int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1634 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1635int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1636 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1637int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1638 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1639int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1640 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1641int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1642 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1643int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1644 struct ip_vs_protocol *pp, int offset,
1645 unsigned int hooknum, struct ip_vs_iphdr *iph);
1646void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1647
1648#ifdef CONFIG_IP_VS_IPV6
1649int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1650 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1651int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1652 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1653int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1654 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1655int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1656 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1657int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1658 struct ip_vs_protocol *pp, int offset,
1659 unsigned int hooknum, struct ip_vs_iphdr *iph);
1660#endif
1661
1662#ifdef CONFIG_SYSCTL
1663/* This is a simple mechanism to ignore packets when
1664 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1665 * we start to drop 1/rate of the packets
1666 */
1667static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1668{
1669 if (!ipvs->drop_rate)
1670 return 0;
1671 if (--ipvs->drop_counter > 0)
1672 return 0;
1673 ipvs->drop_counter = ipvs->drop_rate;
1674 return 1;
1675}
1676#else
1677static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1678#endif
1679
1680#ifdef CONFIG_SYSCTL
1681/* Enqueue delayed work for expiring no dest connections
1682 * Only run when sysctl_expire_nodest=1
1683 */
1684static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1685{
1686 if (sysctl_expire_nodest_conn(ipvs))
1687 queue_delayed_work(system_long_wq,
1688 &ipvs->expire_nodest_conn_work, 1);
1689}
1690
1691void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1692#else
1693static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1694#endif
1695
1696#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1697 IP_VS_CONN_F_FWD_MASK)
1698
1699/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1700#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1701
1702static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1703{
1704 char fwd;
1705
1706 switch (IP_VS_FWD_METHOD(cp)) {
1707 case IP_VS_CONN_F_MASQ:
1708 fwd = 'M'; break;
1709 case IP_VS_CONN_F_LOCALNODE:
1710 fwd = 'L'; break;
1711 case IP_VS_CONN_F_TUNNEL:
1712 fwd = 'T'; break;
1713 case IP_VS_CONN_F_DROUTE:
1714 fwd = 'R'; break;
1715 case IP_VS_CONN_F_BYPASS:
1716 fwd = 'B'; break;
1717 default:
1718 fwd = '?'; break;
1719 }
1720 return fwd;
1721}
1722
1723void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1724 struct ip_vs_conn *cp, int dir);
1725
1726#ifdef CONFIG_IP_VS_IPV6
1727void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1728 struct ip_vs_conn *cp, int dir);
1729#endif
1730
1731__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1732
1733static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1734{
1735 __be32 diff[2] = { ~old, new };
1736
1737 return csum_partial(diff, sizeof(diff), oldsum);
1738}
1739
1740#ifdef CONFIG_IP_VS_IPV6
1741static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1742 __wsum oldsum)
1743{
1744 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1745 new[3], new[2], new[1], new[0] };
1746
1747 return csum_partial(diff, sizeof(diff), oldsum);
1748}
1749#endif
1750
1751static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1752{
1753 __be16 diff[2] = { ~old, new };
1754
1755 return csum_partial(diff, sizeof(diff), oldsum);
1756}
1757
1758/* Forget current conntrack (unconfirmed) and attach notrack entry */
1759static inline void ip_vs_notrack(struct sk_buff *skb)
1760{
1761#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1762 enum ip_conntrack_info ctinfo;
1763 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1764
1765 if (ct) {
1766 nf_conntrack_put(&ct->ct_general);
1767 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1768 }
1769#endif
1770}
1771
1772#ifdef CONFIG_IP_VS_NFCT
1773/* Netfilter connection tracking
1774 * (from ip_vs_nfct.c)
1775 */
1776static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1777{
1778#ifdef CONFIG_SYSCTL
1779 return ipvs->sysctl_conntrack;
1780#else
1781 return 0;
1782#endif
1783}
1784
1785void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1786 int outin);
1787int ip_vs_confirm_conntrack(struct sk_buff *skb);
1788void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1789 struct ip_vs_conn *cp, u_int8_t proto,
1790 const __be16 port, int from_rs);
1791void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1792
1793#else
1794
1795static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1796{
1797 return 0;
1798}
1799
1800static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1801 struct ip_vs_conn *cp, int outin)
1802{
1803}
1804
1805static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1806{
1807 return NF_ACCEPT;
1808}
1809
1810static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1811{
1812}
1813#endif /* CONFIG_IP_VS_NFCT */
1814
1815/* Using old conntrack that can not be redirected to another real server? */
1816static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1817 struct sk_buff *skb)
1818{
1819#ifdef CONFIG_IP_VS_NFCT
1820 enum ip_conntrack_info ctinfo;
1821 struct nf_conn *ct;
1822
1823 ct = nf_ct_get(skb, &ctinfo);
1824 if (ct && nf_ct_is_confirmed(ct))
1825 return true;
1826#endif
1827 return false;
1828}
1829
1830static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1831{
1832#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1833 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1834 int ret = 0;
1835
1836 if (!(svc->conntrack_afmask & afmask)) {
1837 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1838 if (ret >= 0)
1839 svc->conntrack_afmask |= afmask;
1840 }
1841 return ret;
1842#else
1843 return 0;
1844#endif
1845}
1846
1847static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1848{
1849#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1850 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1851
1852 if (svc->conntrack_afmask & afmask) {
1853 nf_ct_netns_put(svc->ipvs->net, svc->af);
1854 svc->conntrack_afmask &= ~afmask;
1855 }
1856#endif
1857}
1858
1859int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1860void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1861
1862static inline int
1863ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1864{
1865 /* We think the overhead of processing active connections is 256
1866 * times higher than that of inactive connections in average. (This
1867 * 256 times might not be accurate, we will change it later) We
1868 * use the following formula to estimate the overhead now:
1869 * dest->activeconns*256 + dest->inactconns
1870 */
1871 return (atomic_read(&dest->activeconns) << 8) +
1872 atomic_read(&dest->inactconns);
1873}
1874
1875#ifdef CONFIG_IP_VS_PROTO_TCP
1876INDIRECT_CALLABLE_DECLARE(int
1877 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1878 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1879#endif
1880
1881#ifdef CONFIG_IP_VS_PROTO_UDP
1882INDIRECT_CALLABLE_DECLARE(int
1883 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1884 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1885#endif
1886#endif /* _NET_IP_VS_H */