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1/* SPDX-License-Identifier: GPL-2.0 */
2/* IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6#ifndef _NET_IP_VS_H
7#define _NET_IP_VS_H
8
9#include <linux/ip_vs.h> /* definitions shared with userland */
10
11#include <asm/types.h> /* for __uXX types */
12
13#include <linux/list.h> /* for struct list_head */
14#include <linux/spinlock.h> /* for struct rwlock_t */
15#include <linux/atomic.h> /* for struct atomic_t */
16#include <linux/refcount.h> /* for struct refcount_t */
17
18#include <linux/compiler.h>
19#include <linux/timer.h>
20#include <linux/bug.h>
21
22#include <net/checksum.h>
23#include <linux/netfilter.h> /* for union nf_inet_addr */
24#include <linux/ip.h>
25#include <linux/ipv6.h> /* for struct ipv6hdr */
26#include <net/ipv6.h>
27#if IS_ENABLED(CONFIG_IP_VS_IPV6)
28#include <linux/netfilter_ipv6/ip6_tables.h>
29#endif
30#if IS_ENABLED(CONFIG_NF_CONNTRACK)
31#include <net/netfilter/nf_conntrack.h>
32#endif
33#include <net/net_namespace.h> /* Netw namespace */
34
35#define IP_VS_HDR_INVERSE 1
36#define IP_VS_HDR_ICMP 2
37
38/* Generic access of ipvs struct */
39static inline struct netns_ipvs *net_ipvs(struct net* net)
40{
41 return net->ipvs;
42}
43
44/* This one needed for single_open_net since net is stored directly in
45 * private not as a struct i.e. seq_file_net can't be used.
46 */
47static inline struct net *seq_file_single_net(struct seq_file *seq)
48{
49#ifdef CONFIG_NET_NS
50 return (struct net *)seq->private;
51#else
52 return &init_net;
53#endif
54}
55
56/* Connections' size value needed by ip_vs_ctl.c */
57extern int ip_vs_conn_tab_size;
58
59struct ip_vs_iphdr {
60 int hdr_flags; /* ipvs flags */
61 __u32 off; /* Where IP or IPv4 header starts */
62 __u32 len; /* IPv4 simply where L4 starts
63 * IPv6 where L4 Transport Header starts */
64 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
65 __s16 protocol;
66 __s32 flags;
67 union nf_inet_addr saddr;
68 union nf_inet_addr daddr;
69};
70
71static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
72 int len, void *buffer)
73{
74 return skb_header_pointer(skb, offset, len, buffer);
75}
76
77/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
78 * IPv6 requires some extra work, as finding proper header position,
79 * depend on the IPv6 extension headers.
80 */
81static inline int
82ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
83 int hdr_flags, struct ip_vs_iphdr *iphdr)
84{
85 iphdr->hdr_flags = hdr_flags;
86 iphdr->off = offset;
87
88#ifdef CONFIG_IP_VS_IPV6
89 if (af == AF_INET6) {
90 struct ipv6hdr _iph;
91 const struct ipv6hdr *iph = skb_header_pointer(
92 skb, offset, sizeof(_iph), &_iph);
93 if (!iph)
94 return 0;
95
96 iphdr->saddr.in6 = iph->saddr;
97 iphdr->daddr.in6 = iph->daddr;
98 /* ipv6_find_hdr() updates len, flags */
99 iphdr->len = offset;
100 iphdr->flags = 0;
101 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
102 &iphdr->fragoffs,
103 &iphdr->flags);
104 if (iphdr->protocol < 0)
105 return 0;
106 } else
107#endif
108 {
109 struct iphdr _iph;
110 const struct iphdr *iph = skb_header_pointer(
111 skb, offset, sizeof(_iph), &_iph);
112 if (!iph)
113 return 0;
114
115 iphdr->len = offset + iph->ihl * 4;
116 iphdr->fragoffs = 0;
117 iphdr->protocol = iph->protocol;
118 iphdr->saddr.ip = iph->saddr;
119 iphdr->daddr.ip = iph->daddr;
120 }
121
122 return 1;
123}
124
125static inline int
126ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
127 bool inverse, struct ip_vs_iphdr *iphdr)
128{
129 int hdr_flags = IP_VS_HDR_ICMP;
130
131 if (inverse)
132 hdr_flags |= IP_VS_HDR_INVERSE;
133
134 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
135}
136
137static inline int
138ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
139 struct ip_vs_iphdr *iphdr)
140{
141 int hdr_flags = 0;
142
143 if (inverse)
144 hdr_flags |= IP_VS_HDR_INVERSE;
145
146 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
147 hdr_flags, iphdr);
148}
149
150static inline bool
151ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
152{
153 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
154}
155
156static inline bool
157ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
158{
159 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
160}
161
162static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
163 const union nf_inet_addr *src)
164{
165#ifdef CONFIG_IP_VS_IPV6
166 if (af == AF_INET6)
167 dst->in6 = src->in6;
168 else
169#endif
170 dst->ip = src->ip;
171}
172
173static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
174 const union nf_inet_addr *src)
175{
176#ifdef CONFIG_IP_VS_IPV6
177 if (af == AF_INET6) {
178 dst->in6 = src->in6;
179 return;
180 }
181#endif
182 dst->ip = src->ip;
183 dst->all[1] = 0;
184 dst->all[2] = 0;
185 dst->all[3] = 0;
186}
187
188static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
189 const union nf_inet_addr *b)
190{
191#ifdef CONFIG_IP_VS_IPV6
192 if (af == AF_INET6)
193 return ipv6_addr_equal(&a->in6, &b->in6);
194#endif
195 return a->ip == b->ip;
196}
197
198#ifdef CONFIG_IP_VS_DEBUG
199#include <linux/net.h>
200
201int ip_vs_get_debug_level(void);
202
203static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
204 const union nf_inet_addr *addr,
205 int *idx)
206{
207 int len;
208#ifdef CONFIG_IP_VS_IPV6
209 if (af == AF_INET6)
210 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
211 &addr->in6) + 1;
212 else
213#endif
214 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
215 &addr->ip) + 1;
216
217 *idx += len;
218 BUG_ON(*idx > buf_len + 1);
219 return &buf[*idx - len];
220}
221
222#define IP_VS_DBG_BUF(level, msg, ...) \
223 do { \
224 char ip_vs_dbg_buf[160]; \
225 int ip_vs_dbg_idx = 0; \
226 if (level <= ip_vs_get_debug_level()) \
227 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
228 } while (0)
229#define IP_VS_ERR_BUF(msg...) \
230 do { \
231 char ip_vs_dbg_buf[160]; \
232 int ip_vs_dbg_idx = 0; \
233 pr_err(msg); \
234 } while (0)
235
236/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
237#define IP_VS_DBG_ADDR(af, addr) \
238 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
239 sizeof(ip_vs_dbg_buf), addr, \
240 &ip_vs_dbg_idx)
241
242#define IP_VS_DBG(level, msg, ...) \
243 do { \
244 if (level <= ip_vs_get_debug_level()) \
245 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
246 } while (0)
247#define IP_VS_DBG_RL(msg, ...) \
248 do { \
249 if (net_ratelimit()) \
250 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
251 } while (0)
252#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
253 do { \
254 if (level <= ip_vs_get_debug_level()) \
255 pp->debug_packet(af, pp, skb, ofs, msg); \
256 } while (0)
257#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
258 do { \
259 if (level <= ip_vs_get_debug_level() && \
260 net_ratelimit()) \
261 pp->debug_packet(af, pp, skb, ofs, msg); \
262 } while (0)
263#else /* NO DEBUGGING at ALL */
264#define IP_VS_DBG_BUF(level, msg...) do {} while (0)
265#define IP_VS_ERR_BUF(msg...) do {} while (0)
266#define IP_VS_DBG(level, msg...) do {} while (0)
267#define IP_VS_DBG_RL(msg...) do {} while (0)
268#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
269#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
270#endif
271
272#define IP_VS_BUG() BUG()
273#define IP_VS_ERR_RL(msg, ...) \
274 do { \
275 if (net_ratelimit()) \
276 pr_err(msg, ##__VA_ARGS__); \
277 } while (0)
278
279#ifdef CONFIG_IP_VS_DEBUG
280#define EnterFunction(level) \
281 do { \
282 if (level <= ip_vs_get_debug_level()) \
283 printk(KERN_DEBUG \
284 pr_fmt("Enter: %s, %s line %i\n"), \
285 __func__, __FILE__, __LINE__); \
286 } while (0)
287#define LeaveFunction(level) \
288 do { \
289 if (level <= ip_vs_get_debug_level()) \
290 printk(KERN_DEBUG \
291 pr_fmt("Leave: %s, %s line %i\n"), \
292 __func__, __FILE__, __LINE__); \
293 } while (0)
294#else
295#define EnterFunction(level) do {} while (0)
296#define LeaveFunction(level) do {} while (0)
297#endif
298
299/* The port number of FTP service (in network order). */
300#define FTPPORT cpu_to_be16(21)
301#define FTPDATA cpu_to_be16(20)
302
303/* TCP State Values */
304enum {
305 IP_VS_TCP_S_NONE = 0,
306 IP_VS_TCP_S_ESTABLISHED,
307 IP_VS_TCP_S_SYN_SENT,
308 IP_VS_TCP_S_SYN_RECV,
309 IP_VS_TCP_S_FIN_WAIT,
310 IP_VS_TCP_S_TIME_WAIT,
311 IP_VS_TCP_S_CLOSE,
312 IP_VS_TCP_S_CLOSE_WAIT,
313 IP_VS_TCP_S_LAST_ACK,
314 IP_VS_TCP_S_LISTEN,
315 IP_VS_TCP_S_SYNACK,
316 IP_VS_TCP_S_LAST
317};
318
319/* UDP State Values */
320enum {
321 IP_VS_UDP_S_NORMAL,
322 IP_VS_UDP_S_LAST,
323};
324
325/* ICMP State Values */
326enum {
327 IP_VS_ICMP_S_NORMAL,
328 IP_VS_ICMP_S_LAST,
329};
330
331/* SCTP State Values */
332enum ip_vs_sctp_states {
333 IP_VS_SCTP_S_NONE,
334 IP_VS_SCTP_S_INIT1,
335 IP_VS_SCTP_S_INIT,
336 IP_VS_SCTP_S_COOKIE_SENT,
337 IP_VS_SCTP_S_COOKIE_REPLIED,
338 IP_VS_SCTP_S_COOKIE_WAIT,
339 IP_VS_SCTP_S_COOKIE,
340 IP_VS_SCTP_S_COOKIE_ECHOED,
341 IP_VS_SCTP_S_ESTABLISHED,
342 IP_VS_SCTP_S_SHUTDOWN_SENT,
343 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
344 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
345 IP_VS_SCTP_S_REJECTED,
346 IP_VS_SCTP_S_CLOSED,
347 IP_VS_SCTP_S_LAST
348};
349
350/* Delta sequence info structure
351 * Each ip_vs_conn has 2 (output AND input seq. changes).
352 * Only used in the VS/NAT.
353 */
354struct ip_vs_seq {
355 __u32 init_seq; /* Add delta from this seq */
356 __u32 delta; /* Delta in sequence numbers */
357 __u32 previous_delta; /* Delta in sequence numbers
358 * before last resized pkt */
359};
360
361/* counters per cpu */
362struct ip_vs_counters {
363 __u64 conns; /* connections scheduled */
364 __u64 inpkts; /* incoming packets */
365 __u64 outpkts; /* outgoing packets */
366 __u64 inbytes; /* incoming bytes */
367 __u64 outbytes; /* outgoing bytes */
368};
369/* Stats per cpu */
370struct ip_vs_cpu_stats {
371 struct ip_vs_counters cnt;
372 struct u64_stats_sync syncp;
373};
374
375/* IPVS statistics objects */
376struct ip_vs_estimator {
377 struct list_head list;
378
379 u64 last_inbytes;
380 u64 last_outbytes;
381 u64 last_conns;
382 u64 last_inpkts;
383 u64 last_outpkts;
384
385 u64 cps;
386 u64 inpps;
387 u64 outpps;
388 u64 inbps;
389 u64 outbps;
390};
391
392/*
393 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
394 */
395struct ip_vs_kstats {
396 u64 conns; /* connections scheduled */
397 u64 inpkts; /* incoming packets */
398 u64 outpkts; /* outgoing packets */
399 u64 inbytes; /* incoming bytes */
400 u64 outbytes; /* outgoing bytes */
401
402 u64 cps; /* current connection rate */
403 u64 inpps; /* current in packet rate */
404 u64 outpps; /* current out packet rate */
405 u64 inbps; /* current in byte rate */
406 u64 outbps; /* current out byte rate */
407};
408
409struct ip_vs_stats {
410 struct ip_vs_kstats kstats; /* kernel statistics */
411 struct ip_vs_estimator est; /* estimator */
412 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
413 spinlock_t lock; /* spin lock */
414 struct ip_vs_kstats kstats0; /* reset values */
415};
416
417struct dst_entry;
418struct iphdr;
419struct ip_vs_conn;
420struct ip_vs_app;
421struct sk_buff;
422struct ip_vs_proto_data;
423
424struct ip_vs_protocol {
425 struct ip_vs_protocol *next;
426 char *name;
427 u16 protocol;
428 u16 num_states;
429 int dont_defrag;
430
431 void (*init)(struct ip_vs_protocol *pp);
432
433 void (*exit)(struct ip_vs_protocol *pp);
434
435 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
436
437 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
438
439 int (*conn_schedule)(struct netns_ipvs *ipvs,
440 int af, struct sk_buff *skb,
441 struct ip_vs_proto_data *pd,
442 int *verdict, struct ip_vs_conn **cpp,
443 struct ip_vs_iphdr *iph);
444
445 struct ip_vs_conn *
446 (*conn_in_get)(struct netns_ipvs *ipvs,
447 int af,
448 const struct sk_buff *skb,
449 const struct ip_vs_iphdr *iph);
450
451 struct ip_vs_conn *
452 (*conn_out_get)(struct netns_ipvs *ipvs,
453 int af,
454 const struct sk_buff *skb,
455 const struct ip_vs_iphdr *iph);
456
457 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
458 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
459
460 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
461 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
462
463 int (*csum_check)(int af, struct sk_buff *skb,
464 struct ip_vs_protocol *pp);
465
466 const char *(*state_name)(int state);
467
468 void (*state_transition)(struct ip_vs_conn *cp, int direction,
469 const struct sk_buff *skb,
470 struct ip_vs_proto_data *pd);
471
472 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
473
474 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
475
476 int (*app_conn_bind)(struct ip_vs_conn *cp);
477
478 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
479 const struct sk_buff *skb,
480 int offset,
481 const char *msg);
482
483 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
484};
485
486/* protocol data per netns */
487struct ip_vs_proto_data {
488 struct ip_vs_proto_data *next;
489 struct ip_vs_protocol *pp;
490 int *timeout_table; /* protocol timeout table */
491 atomic_t appcnt; /* counter of proto app incs. */
492 struct tcp_states_t *tcp_state_table;
493};
494
495struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
496struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
497 unsigned short proto);
498
499struct ip_vs_conn_param {
500 struct netns_ipvs *ipvs;
501 const union nf_inet_addr *caddr;
502 const union nf_inet_addr *vaddr;
503 __be16 cport;
504 __be16 vport;
505 __u16 protocol;
506 u16 af;
507
508 const struct ip_vs_pe *pe;
509 char *pe_data;
510 __u8 pe_data_len;
511};
512
513/* IP_VS structure allocated for each dynamically scheduled connection */
514struct ip_vs_conn {
515 struct hlist_node c_list; /* hashed list heads */
516 /* Protocol, addresses and port numbers */
517 __be16 cport;
518 __be16 dport;
519 __be16 vport;
520 u16 af; /* address family */
521 union nf_inet_addr caddr; /* client address */
522 union nf_inet_addr vaddr; /* virtual address */
523 union nf_inet_addr daddr; /* destination address */
524 volatile __u32 flags; /* status flags */
525 __u16 protocol; /* Which protocol (TCP/UDP) */
526 __u16 daf; /* Address family of the dest */
527 struct netns_ipvs *ipvs;
528
529 /* counter and timer */
530 refcount_t refcnt; /* reference count */
531 struct timer_list timer; /* Expiration timer */
532 volatile unsigned long timeout; /* timeout */
533
534 /* Flags and state transition */
535 spinlock_t lock; /* lock for state transition */
536 volatile __u16 state; /* state info */
537 volatile __u16 old_state; /* old state, to be used for
538 * state transition triggerd
539 * synchronization
540 */
541 __u32 fwmark; /* Fire wall mark from skb */
542 unsigned long sync_endtime; /* jiffies + sent_retries */
543
544 /* Control members */
545 struct ip_vs_conn *control; /* Master control connection */
546 atomic_t n_control; /* Number of controlled ones */
547 struct ip_vs_dest *dest; /* real server */
548 atomic_t in_pkts; /* incoming packet counter */
549
550 /* Packet transmitter for different forwarding methods. If it
551 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
552 * otherwise this must be changed to a sk_buff **.
553 * NF_ACCEPT can be returned when destination is local.
554 */
555 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
556 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
557
558 /* Note: we can group the following members into a structure,
559 * in order to save more space, and the following members are
560 * only used in VS/NAT anyway
561 */
562 struct ip_vs_app *app; /* bound ip_vs_app object */
563 void *app_data; /* Application private data */
564 struct ip_vs_seq in_seq; /* incoming seq. struct */
565 struct ip_vs_seq out_seq; /* outgoing seq. struct */
566
567 const struct ip_vs_pe *pe;
568 char *pe_data;
569 __u8 pe_data_len;
570
571 struct rcu_head rcu_head;
572};
573
574/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
575 * for IPv6 support.
576 *
577 * We need these to conveniently pass around service and destination
578 * options, but unfortunately, we also need to keep the old definitions to
579 * maintain userspace backwards compatibility for the setsockopt interface.
580 */
581struct ip_vs_service_user_kern {
582 /* virtual service addresses */
583 u16 af;
584 u16 protocol;
585 union nf_inet_addr addr; /* virtual ip address */
586 __be16 port;
587 u32 fwmark; /* firwall mark of service */
588
589 /* virtual service options */
590 char *sched_name;
591 char *pe_name;
592 unsigned int flags; /* virtual service flags */
593 unsigned int timeout; /* persistent timeout in sec */
594 __be32 netmask; /* persistent netmask or plen */
595};
596
597
598struct ip_vs_dest_user_kern {
599 /* destination server address */
600 union nf_inet_addr addr;
601 __be16 port;
602
603 /* real server options */
604 unsigned int conn_flags; /* connection flags */
605 int weight; /* destination weight */
606
607 /* thresholds for active connections */
608 u32 u_threshold; /* upper threshold */
609 u32 l_threshold; /* lower threshold */
610
611 /* Address family of addr */
612 u16 af;
613};
614
615
616/*
617 * The information about the virtual service offered to the net and the
618 * forwarding entries.
619 */
620struct ip_vs_service {
621 struct hlist_node s_list; /* for normal service table */
622 struct hlist_node f_list; /* for fwmark-based service table */
623 atomic_t refcnt; /* reference counter */
624
625 u16 af; /* address family */
626 __u16 protocol; /* which protocol (TCP/UDP) */
627 union nf_inet_addr addr; /* IP address for virtual service */
628 __be16 port; /* port number for the service */
629 __u32 fwmark; /* firewall mark of the service */
630 unsigned int flags; /* service status flags */
631 unsigned int timeout; /* persistent timeout in ticks */
632 __be32 netmask; /* grouping granularity, mask/plen */
633 struct netns_ipvs *ipvs;
634
635 struct list_head destinations; /* real server d-linked list */
636 __u32 num_dests; /* number of servers */
637 struct ip_vs_stats stats; /* statistics for the service */
638
639 /* for scheduling */
640 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
641 spinlock_t sched_lock; /* lock sched_data */
642 void *sched_data; /* scheduler application data */
643
644 /* alternate persistence engine */
645 struct ip_vs_pe __rcu *pe;
646
647 struct rcu_head rcu_head;
648};
649
650/* Information for cached dst */
651struct ip_vs_dest_dst {
652 struct dst_entry *dst_cache; /* destination cache entry */
653 u32 dst_cookie;
654 union nf_inet_addr dst_saddr;
655 struct rcu_head rcu_head;
656};
657
658/* The real server destination forwarding entry with ip address, port number,
659 * and so on.
660 */
661struct ip_vs_dest {
662 struct list_head n_list; /* for the dests in the service */
663 struct hlist_node d_list; /* for table with all the dests */
664
665 u16 af; /* address family */
666 __be16 port; /* port number of the server */
667 union nf_inet_addr addr; /* IP address of the server */
668 volatile unsigned int flags; /* dest status flags */
669 atomic_t conn_flags; /* flags to copy to conn */
670 atomic_t weight; /* server weight */
671
672 refcount_t refcnt; /* reference counter */
673 struct ip_vs_stats stats; /* statistics */
674 unsigned long idle_start; /* start time, jiffies */
675
676 /* connection counters and thresholds */
677 atomic_t activeconns; /* active connections */
678 atomic_t inactconns; /* inactive connections */
679 atomic_t persistconns; /* persistent connections */
680 __u32 u_threshold; /* upper threshold */
681 __u32 l_threshold; /* lower threshold */
682
683 /* for destination cache */
684 spinlock_t dst_lock; /* lock of dst_cache */
685 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
686
687 /* for virtual service */
688 struct ip_vs_service __rcu *svc; /* service it belongs to */
689 __u16 protocol; /* which protocol (TCP/UDP) */
690 __be16 vport; /* virtual port number */
691 union nf_inet_addr vaddr; /* virtual IP address */
692 __u32 vfwmark; /* firewall mark of service */
693
694 struct list_head t_list; /* in dest_trash */
695 unsigned int in_rs_table:1; /* we are in rs_table */
696};
697
698/* The scheduler object */
699struct ip_vs_scheduler {
700 struct list_head n_list; /* d-linked list head */
701 char *name; /* scheduler name */
702 atomic_t refcnt; /* reference counter */
703 struct module *module; /* THIS_MODULE/NULL */
704
705 /* scheduler initializing service */
706 int (*init_service)(struct ip_vs_service *svc);
707 /* scheduling service finish */
708 void (*done_service)(struct ip_vs_service *svc);
709 /* dest is linked */
710 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
711 /* dest is unlinked */
712 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
713 /* dest is updated */
714 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
715
716 /* selecting a server from the given service */
717 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
718 const struct sk_buff *skb,
719 struct ip_vs_iphdr *iph);
720};
721
722/* The persistence engine object */
723struct ip_vs_pe {
724 struct list_head n_list; /* d-linked list head */
725 char *name; /* scheduler name */
726 atomic_t refcnt; /* reference counter */
727 struct module *module; /* THIS_MODULE/NULL */
728
729 /* get the connection template, if any */
730 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
731 bool (*ct_match)(const struct ip_vs_conn_param *p,
732 struct ip_vs_conn *ct);
733 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
734 bool inverse);
735 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
736 /* create connections for real-server outgoing packets */
737 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
738 struct ip_vs_dest *dest,
739 struct sk_buff *skb,
740 const struct ip_vs_iphdr *iph,
741 __be16 dport, __be16 cport);
742};
743
744/* The application module object (a.k.a. app incarnation) */
745struct ip_vs_app {
746 struct list_head a_list; /* member in app list */
747 int type; /* IP_VS_APP_TYPE_xxx */
748 char *name; /* application module name */
749 __u16 protocol;
750 struct module *module; /* THIS_MODULE/NULL */
751 struct list_head incs_list; /* list of incarnations */
752
753 /* members for application incarnations */
754 struct list_head p_list; /* member in proto app list */
755 struct ip_vs_app *app; /* its real application */
756 __be16 port; /* port number in net order */
757 atomic_t usecnt; /* usage counter */
758 struct rcu_head rcu_head;
759
760 /* output hook: Process packet in inout direction, diff set for TCP.
761 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
762 * 2=Mangled but checksum was not updated
763 */
764 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
765 struct sk_buff *, int *diff);
766
767 /* input hook: Process packet in outin direction, diff set for TCP.
768 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
769 * 2=Mangled but checksum was not updated
770 */
771 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
772 struct sk_buff *, int *diff);
773
774 /* ip_vs_app initializer */
775 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
776
777 /* ip_vs_app finish */
778 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
779
780
781 /* not used now */
782 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
783 struct ip_vs_protocol *);
784
785 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
786
787 int * timeout_table;
788 int * timeouts;
789 int timeouts_size;
790
791 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
792 int *verdict, struct ip_vs_conn **cpp);
793
794 struct ip_vs_conn *
795 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
796 const struct iphdr *iph, int inverse);
797
798 struct ip_vs_conn *
799 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
800 const struct iphdr *iph, int inverse);
801
802 int (*state_transition)(struct ip_vs_conn *cp, int direction,
803 const struct sk_buff *skb,
804 struct ip_vs_app *app);
805
806 void (*timeout_change)(struct ip_vs_app *app, int flags);
807};
808
809struct ipvs_master_sync_state {
810 struct list_head sync_queue;
811 struct ip_vs_sync_buff *sync_buff;
812 unsigned long sync_queue_len;
813 unsigned int sync_queue_delay;
814 struct task_struct *master_thread;
815 struct delayed_work master_wakeup_work;
816 struct netns_ipvs *ipvs;
817};
818
819/* How much time to keep dests in trash */
820#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
821
822struct ipvs_sync_daemon_cfg {
823 union nf_inet_addr mcast_group;
824 int syncid;
825 u16 sync_maxlen;
826 u16 mcast_port;
827 u8 mcast_af;
828 u8 mcast_ttl;
829 /* multicast interface name */
830 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
831};
832
833/* IPVS in network namespace */
834struct netns_ipvs {
835 int gen; /* Generation */
836 int enable; /* enable like nf_hooks do */
837 /* Hash table: for real service lookups */
838 #define IP_VS_RTAB_BITS 4
839 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
840 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
841
842 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
843 /* ip_vs_app */
844 struct list_head app_list;
845 /* ip_vs_proto */
846 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
847 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
848 /* ip_vs_proto_tcp */
849#ifdef CONFIG_IP_VS_PROTO_TCP
850 #define TCP_APP_TAB_BITS 4
851 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
852 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
853 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
854#endif
855 /* ip_vs_proto_udp */
856#ifdef CONFIG_IP_VS_PROTO_UDP
857 #define UDP_APP_TAB_BITS 4
858 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
859 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
860 struct list_head udp_apps[UDP_APP_TAB_SIZE];
861#endif
862 /* ip_vs_proto_sctp */
863#ifdef CONFIG_IP_VS_PROTO_SCTP
864 #define SCTP_APP_TAB_BITS 4
865 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
866 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
867 /* Hash table for SCTP application incarnations */
868 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
869#endif
870 /* ip_vs_conn */
871 atomic_t conn_count; /* connection counter */
872
873 /* ip_vs_ctl */
874 struct ip_vs_stats tot_stats; /* Statistics & est. */
875
876 int num_services; /* no of virtual services */
877
878 /* Trash for destinations */
879 struct list_head dest_trash;
880 spinlock_t dest_trash_lock;
881 struct timer_list dest_trash_timer; /* expiration timer */
882 /* Service counters */
883 atomic_t ftpsvc_counter;
884 atomic_t nullsvc_counter;
885 atomic_t conn_out_counter;
886
887#ifdef CONFIG_SYSCTL
888 /* 1/rate drop and drop-entry variables */
889 struct delayed_work defense_work; /* Work handler */
890 int drop_rate;
891 int drop_counter;
892 atomic_t dropentry;
893 /* locks in ctl.c */
894 spinlock_t dropentry_lock; /* drop entry handling */
895 spinlock_t droppacket_lock; /* drop packet handling */
896 spinlock_t securetcp_lock; /* state and timeout tables */
897
898 /* sys-ctl struct */
899 struct ctl_table_header *sysctl_hdr;
900 struct ctl_table *sysctl_tbl;
901#endif
902
903 /* sysctl variables */
904 int sysctl_amemthresh;
905 int sysctl_am_droprate;
906 int sysctl_drop_entry;
907 int sysctl_drop_packet;
908 int sysctl_secure_tcp;
909#ifdef CONFIG_IP_VS_NFCT
910 int sysctl_conntrack;
911#endif
912 int sysctl_snat_reroute;
913 int sysctl_sync_ver;
914 int sysctl_sync_ports;
915 int sysctl_sync_persist_mode;
916 unsigned long sysctl_sync_qlen_max;
917 int sysctl_sync_sock_size;
918 int sysctl_cache_bypass;
919 int sysctl_expire_nodest_conn;
920 int sysctl_sloppy_tcp;
921 int sysctl_sloppy_sctp;
922 int sysctl_expire_quiescent_template;
923 int sysctl_sync_threshold[2];
924 unsigned int sysctl_sync_refresh_period;
925 int sysctl_sync_retries;
926 int sysctl_nat_icmp_send;
927 int sysctl_pmtu_disc;
928 int sysctl_backup_only;
929 int sysctl_conn_reuse_mode;
930 int sysctl_schedule_icmp;
931 int sysctl_ignore_tunneled;
932
933 /* ip_vs_lblc */
934 int sysctl_lblc_expiration;
935 struct ctl_table_header *lblc_ctl_header;
936 struct ctl_table *lblc_ctl_table;
937 /* ip_vs_lblcr */
938 int sysctl_lblcr_expiration;
939 struct ctl_table_header *lblcr_ctl_header;
940 struct ctl_table *lblcr_ctl_table;
941 /* ip_vs_est */
942 struct list_head est_list; /* estimator list */
943 spinlock_t est_lock;
944 struct timer_list est_timer; /* Estimation timer */
945 /* ip_vs_sync */
946 spinlock_t sync_lock;
947 struct ipvs_master_sync_state *ms;
948 spinlock_t sync_buff_lock;
949 struct task_struct **backup_threads;
950 int threads_mask;
951 volatile int sync_state;
952 struct mutex sync_mutex;
953 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
954 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
955 /* net name space ptr */
956 struct net *net; /* Needed by timer routines */
957 /* Number of heterogeneous destinations, needed becaus heterogeneous
958 * are not supported when synchronization is enabled.
959 */
960 unsigned int mixed_address_family_dests;
961};
962
963#define DEFAULT_SYNC_THRESHOLD 3
964#define DEFAULT_SYNC_PERIOD 50
965#define DEFAULT_SYNC_VER 1
966#define DEFAULT_SLOPPY_TCP 0
967#define DEFAULT_SLOPPY_SCTP 0
968#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
969#define DEFAULT_SYNC_RETRIES 0
970#define IPVS_SYNC_WAKEUP_RATE 8
971#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
972#define IPVS_SYNC_SEND_DELAY (HZ / 50)
973#define IPVS_SYNC_CHECK_PERIOD HZ
974#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
975#define IPVS_SYNC_PORTS_MAX (1 << 6)
976
977#ifdef CONFIG_SYSCTL
978
979static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
980{
981 return ipvs->sysctl_sync_threshold[0];
982}
983
984static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
985{
986 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
987}
988
989static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
990{
991 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
992}
993
994static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
995{
996 return ipvs->sysctl_sync_retries;
997}
998
999static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1000{
1001 return ipvs->sysctl_sync_ver;
1002}
1003
1004static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1005{
1006 return ipvs->sysctl_sloppy_tcp;
1007}
1008
1009static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1010{
1011 return ipvs->sysctl_sloppy_sctp;
1012}
1013
1014static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1015{
1016 return READ_ONCE(ipvs->sysctl_sync_ports);
1017}
1018
1019static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1020{
1021 return ipvs->sysctl_sync_persist_mode;
1022}
1023
1024static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1025{
1026 return ipvs->sysctl_sync_qlen_max;
1027}
1028
1029static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1030{
1031 return ipvs->sysctl_sync_sock_size;
1032}
1033
1034static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1035{
1036 return ipvs->sysctl_pmtu_disc;
1037}
1038
1039static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1040{
1041 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1042 ipvs->sysctl_backup_only;
1043}
1044
1045static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1046{
1047 return ipvs->sysctl_conn_reuse_mode;
1048}
1049
1050static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1051{
1052 return ipvs->sysctl_schedule_icmp;
1053}
1054
1055static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1056{
1057 return ipvs->sysctl_ignore_tunneled;
1058}
1059
1060static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1061{
1062 return ipvs->sysctl_cache_bypass;
1063}
1064
1065#else
1066
1067static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1068{
1069 return DEFAULT_SYNC_THRESHOLD;
1070}
1071
1072static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1073{
1074 return DEFAULT_SYNC_PERIOD;
1075}
1076
1077static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1078{
1079 return DEFAULT_SYNC_REFRESH_PERIOD;
1080}
1081
1082static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1083{
1084 return DEFAULT_SYNC_RETRIES & 3;
1085}
1086
1087static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1088{
1089 return DEFAULT_SYNC_VER;
1090}
1091
1092static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1093{
1094 return DEFAULT_SLOPPY_TCP;
1095}
1096
1097static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1098{
1099 return DEFAULT_SLOPPY_SCTP;
1100}
1101
1102static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1103{
1104 return 1;
1105}
1106
1107static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1108{
1109 return 0;
1110}
1111
1112static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1113{
1114 return IPVS_SYNC_QLEN_MAX;
1115}
1116
1117static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1118{
1119 return 0;
1120}
1121
1122static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1123{
1124 return 1;
1125}
1126
1127static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1128{
1129 return 0;
1130}
1131
1132static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1133{
1134 return 1;
1135}
1136
1137static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1138{
1139 return 0;
1140}
1141
1142static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1143{
1144 return 0;
1145}
1146
1147static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1148{
1149 return 0;
1150}
1151
1152#endif
1153
1154/* IPVS core functions
1155 * (from ip_vs_core.c)
1156 */
1157const char *ip_vs_proto_name(unsigned int proto);
1158void ip_vs_init_hash_table(struct list_head *table, int rows);
1159struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1160 struct ip_vs_dest *dest,
1161 struct sk_buff *skb,
1162 const struct ip_vs_iphdr *iph,
1163 __be16 dport,
1164 __be16 cport);
1165#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1166
1167#define IP_VS_APP_TYPE_FTP 1
1168
1169/* ip_vs_conn handling functions
1170 * (from ip_vs_conn.c)
1171 */
1172enum {
1173 IP_VS_DIR_INPUT = 0,
1174 IP_VS_DIR_OUTPUT,
1175 IP_VS_DIR_INPUT_ONLY,
1176 IP_VS_DIR_LAST,
1177};
1178
1179static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1180 const union nf_inet_addr *caddr,
1181 __be16 cport,
1182 const union nf_inet_addr *vaddr,
1183 __be16 vport,
1184 struct ip_vs_conn_param *p)
1185{
1186 p->ipvs = ipvs;
1187 p->af = af;
1188 p->protocol = protocol;
1189 p->caddr = caddr;
1190 p->cport = cport;
1191 p->vaddr = vaddr;
1192 p->vport = vport;
1193 p->pe = NULL;
1194 p->pe_data = NULL;
1195}
1196
1197struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1198struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1199
1200struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1201 const struct sk_buff *skb,
1202 const struct ip_vs_iphdr *iph);
1203
1204struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1205
1206struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1207 const struct sk_buff *skb,
1208 const struct ip_vs_iphdr *iph);
1209
1210/* Get reference to gain full access to conn.
1211 * By default, RCU read-side critical sections have access only to
1212 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1213 */
1214static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1215{
1216 return refcount_inc_not_zero(&cp->refcnt);
1217}
1218
1219/* put back the conn without restarting its timer */
1220static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1221{
1222 smp_mb__before_atomic();
1223 refcount_dec(&cp->refcnt);
1224}
1225void ip_vs_conn_put(struct ip_vs_conn *cp);
1226void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1227
1228struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1229 const union nf_inet_addr *daddr,
1230 __be16 dport, unsigned int flags,
1231 struct ip_vs_dest *dest, __u32 fwmark);
1232void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1233
1234const char *ip_vs_state_name(__u16 proto, int state);
1235
1236void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1237int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1238void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1239int ip_vs_conn_init(void);
1240void ip_vs_conn_cleanup(void);
1241
1242static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1243{
1244 struct ip_vs_conn *ctl_cp = cp->control;
1245 if (!ctl_cp) {
1246 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1247 "%s:%d to %s:%d\n",
1248 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1249 ntohs(cp->cport),
1250 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1251 ntohs(cp->vport));
1252
1253 return;
1254 }
1255
1256 IP_VS_DBG_BUF(7, "DELeting control for: "
1257 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1258 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1259 ntohs(cp->cport),
1260 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1261 ntohs(ctl_cp->cport));
1262
1263 cp->control = NULL;
1264 if (atomic_read(&ctl_cp->n_control) == 0) {
1265 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1266 "%s:%d to %s:%d\n",
1267 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1268 ntohs(cp->cport),
1269 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1270 ntohs(cp->vport));
1271
1272 return;
1273 }
1274 atomic_dec(&ctl_cp->n_control);
1275}
1276
1277static inline void
1278ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1279{
1280 if (cp->control) {
1281 IP_VS_ERR_BUF("request control ADD for already controlled: "
1282 "%s:%d to %s:%d\n",
1283 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1284 ntohs(cp->cport),
1285 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1286 ntohs(cp->vport));
1287
1288 ip_vs_control_del(cp);
1289 }
1290
1291 IP_VS_DBG_BUF(7, "ADDing control for: "
1292 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1293 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1294 ntohs(cp->cport),
1295 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1296 ntohs(ctl_cp->cport));
1297
1298 cp->control = ctl_cp;
1299 atomic_inc(&ctl_cp->n_control);
1300}
1301
1302/* IPVS netns init & cleanup functions */
1303int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1304int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1305int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1306int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1307int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1308int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1309void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1310void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1311void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1312void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1313void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1314void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1315void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1316
1317/* IPVS application functions
1318 * (from ip_vs_app.c)
1319 */
1320#define IP_VS_APP_MAX_PORTS 8
1321struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1322void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1323int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1324void ip_vs_unbind_app(struct ip_vs_conn *cp);
1325int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1326 __u16 port);
1327int ip_vs_app_inc_get(struct ip_vs_app *inc);
1328void ip_vs_app_inc_put(struct ip_vs_app *inc);
1329
1330int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1331int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1332
1333int register_ip_vs_pe(struct ip_vs_pe *pe);
1334int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1335struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1336struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1337
1338/* Use a #define to avoid all of module.h just for these trivial ops */
1339#define ip_vs_pe_get(pe) \
1340 if (pe && pe->module) \
1341 __module_get(pe->module);
1342
1343#define ip_vs_pe_put(pe) \
1344 if (pe && pe->module) \
1345 module_put(pe->module);
1346
1347/* IPVS protocol functions (from ip_vs_proto.c) */
1348int ip_vs_protocol_init(void);
1349void ip_vs_protocol_cleanup(void);
1350void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1351int *ip_vs_create_timeout_table(int *table, int size);
1352void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1353 const struct sk_buff *skb, int offset,
1354 const char *msg);
1355
1356extern struct ip_vs_protocol ip_vs_protocol_tcp;
1357extern struct ip_vs_protocol ip_vs_protocol_udp;
1358extern struct ip_vs_protocol ip_vs_protocol_icmp;
1359extern struct ip_vs_protocol ip_vs_protocol_esp;
1360extern struct ip_vs_protocol ip_vs_protocol_ah;
1361extern struct ip_vs_protocol ip_vs_protocol_sctp;
1362
1363/* Registering/unregistering scheduler functions
1364 * (from ip_vs_sched.c)
1365 */
1366int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1367int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1368int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1369 struct ip_vs_scheduler *scheduler);
1370void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1371 struct ip_vs_scheduler *sched);
1372struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1373void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1374struct ip_vs_conn *
1375ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1376 struct ip_vs_proto_data *pd, int *ignored,
1377 struct ip_vs_iphdr *iph);
1378int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1379 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1380
1381void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1382
1383/* IPVS control data and functions (from ip_vs_ctl.c) */
1384extern struct ip_vs_stats ip_vs_stats;
1385extern int sysctl_ip_vs_sync_ver;
1386
1387struct ip_vs_service *
1388ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1389 const union nf_inet_addr *vaddr, __be16 vport);
1390
1391bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1392 const union nf_inet_addr *daddr, __be16 dport);
1393
1394struct ip_vs_dest *
1395ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1396 const union nf_inet_addr *daddr, __be16 dport);
1397
1398int ip_vs_use_count_inc(void);
1399void ip_vs_use_count_dec(void);
1400int ip_vs_register_nl_ioctl(void);
1401void ip_vs_unregister_nl_ioctl(void);
1402int ip_vs_control_init(void);
1403void ip_vs_control_cleanup(void);
1404struct ip_vs_dest *
1405ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1406 const union nf_inet_addr *daddr, __be16 dport,
1407 const union nf_inet_addr *vaddr, __be16 vport,
1408 __u16 protocol, __u32 fwmark, __u32 flags);
1409void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1410
1411static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1412{
1413 refcount_inc(&dest->refcnt);
1414}
1415
1416static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1417{
1418 smp_mb__before_atomic();
1419 refcount_dec(&dest->refcnt);
1420}
1421
1422static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1423{
1424 if (refcount_dec_and_test(&dest->refcnt))
1425 kfree(dest);
1426}
1427
1428/* IPVS sync daemon data and function prototypes
1429 * (from ip_vs_sync.c)
1430 */
1431int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1432 int state);
1433int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1434void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1435
1436/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1437void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1438void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1439void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1440void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1441
1442/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1443int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1447int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1448 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1449int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1450 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1451int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1452 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1453int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1454 struct ip_vs_protocol *pp, int offset,
1455 unsigned int hooknum, struct ip_vs_iphdr *iph);
1456void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1457
1458#ifdef CONFIG_IP_VS_IPV6
1459int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1460 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1461int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1462 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1464 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1466 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1467int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1468 struct ip_vs_protocol *pp, int offset,
1469 unsigned int hooknum, struct ip_vs_iphdr *iph);
1470#endif
1471
1472#ifdef CONFIG_SYSCTL
1473/* This is a simple mechanism to ignore packets when
1474 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1475 * we start to drop 1/rate of the packets
1476 */
1477static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1478{
1479 if (!ipvs->drop_rate)
1480 return 0;
1481 if (--ipvs->drop_counter > 0)
1482 return 0;
1483 ipvs->drop_counter = ipvs->drop_rate;
1484 return 1;
1485}
1486#else
1487static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1488#endif
1489
1490/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1491#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1492
1493static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1494{
1495 char fwd;
1496
1497 switch (IP_VS_FWD_METHOD(cp)) {
1498 case IP_VS_CONN_F_MASQ:
1499 fwd = 'M'; break;
1500 case IP_VS_CONN_F_LOCALNODE:
1501 fwd = 'L'; break;
1502 case IP_VS_CONN_F_TUNNEL:
1503 fwd = 'T'; break;
1504 case IP_VS_CONN_F_DROUTE:
1505 fwd = 'R'; break;
1506 case IP_VS_CONN_F_BYPASS:
1507 fwd = 'B'; break;
1508 default:
1509 fwd = '?'; break;
1510 }
1511 return fwd;
1512}
1513
1514void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1515 struct ip_vs_conn *cp, int dir);
1516
1517#ifdef CONFIG_IP_VS_IPV6
1518void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1519 struct ip_vs_conn *cp, int dir);
1520#endif
1521
1522__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1523
1524static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1525{
1526 __be32 diff[2] = { ~old, new };
1527
1528 return csum_partial(diff, sizeof(diff), oldsum);
1529}
1530
1531#ifdef CONFIG_IP_VS_IPV6
1532static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1533 __wsum oldsum)
1534{
1535 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1536 new[3], new[2], new[1], new[0] };
1537
1538 return csum_partial(diff, sizeof(diff), oldsum);
1539}
1540#endif
1541
1542static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1543{
1544 __be16 diff[2] = { ~old, new };
1545
1546 return csum_partial(diff, sizeof(diff), oldsum);
1547}
1548
1549/* Forget current conntrack (unconfirmed) and attach notrack entry */
1550static inline void ip_vs_notrack(struct sk_buff *skb)
1551{
1552#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1553 enum ip_conntrack_info ctinfo;
1554 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1555
1556 if (ct) {
1557 nf_conntrack_put(&ct->ct_general);
1558 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1559 }
1560#endif
1561}
1562
1563#ifdef CONFIG_IP_VS_NFCT
1564/* Netfilter connection tracking
1565 * (from ip_vs_nfct.c)
1566 */
1567static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1568{
1569#ifdef CONFIG_SYSCTL
1570 return ipvs->sysctl_conntrack;
1571#else
1572 return 0;
1573#endif
1574}
1575
1576void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1577 int outin);
1578int ip_vs_confirm_conntrack(struct sk_buff *skb);
1579void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1580 struct ip_vs_conn *cp, u_int8_t proto,
1581 const __be16 port, int from_rs);
1582void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1583
1584#else
1585
1586static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1587{
1588 return 0;
1589}
1590
1591static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1592 struct ip_vs_conn *cp, int outin)
1593{
1594}
1595
1596static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1597{
1598 return NF_ACCEPT;
1599}
1600
1601static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1602{
1603}
1604#endif /* CONFIG_IP_VS_NFCT */
1605
1606/* Really using conntrack? */
1607static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1608 struct sk_buff *skb)
1609{
1610#ifdef CONFIG_IP_VS_NFCT
1611 enum ip_conntrack_info ctinfo;
1612 struct nf_conn *ct;
1613
1614 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1615 return false;
1616 ct = nf_ct_get(skb, &ctinfo);
1617 if (ct)
1618 return true;
1619#endif
1620 return false;
1621}
1622
1623static inline int
1624ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1625{
1626 /* We think the overhead of processing active connections is 256
1627 * times higher than that of inactive connections in average. (This
1628 * 256 times might not be accurate, we will change it later) We
1629 * use the following formula to estimate the overhead now:
1630 * dest->activeconns*256 + dest->inactconns
1631 */
1632 return (atomic_read(&dest->activeconns) << 8) +
1633 atomic_read(&dest->inactconns);
1634}
1635
1636#endif /* _NET_IP_VS_H */
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/* The port number of FTP service (in network order). */
269#define FTPPORT cpu_to_be16(21)
270#define FTPDATA cpu_to_be16(20)
271
272/* TCP State Values */
273enum {
274 IP_VS_TCP_S_NONE = 0,
275 IP_VS_TCP_S_ESTABLISHED,
276 IP_VS_TCP_S_SYN_SENT,
277 IP_VS_TCP_S_SYN_RECV,
278 IP_VS_TCP_S_FIN_WAIT,
279 IP_VS_TCP_S_TIME_WAIT,
280 IP_VS_TCP_S_CLOSE,
281 IP_VS_TCP_S_CLOSE_WAIT,
282 IP_VS_TCP_S_LAST_ACK,
283 IP_VS_TCP_S_LISTEN,
284 IP_VS_TCP_S_SYNACK,
285 IP_VS_TCP_S_LAST
286};
287
288/* UDP State Values */
289enum {
290 IP_VS_UDP_S_NORMAL,
291 IP_VS_UDP_S_LAST,
292};
293
294/* ICMP State Values */
295enum {
296 IP_VS_ICMP_S_NORMAL,
297 IP_VS_ICMP_S_LAST,
298};
299
300/* SCTP State Values */
301enum ip_vs_sctp_states {
302 IP_VS_SCTP_S_NONE,
303 IP_VS_SCTP_S_INIT1,
304 IP_VS_SCTP_S_INIT,
305 IP_VS_SCTP_S_COOKIE_SENT,
306 IP_VS_SCTP_S_COOKIE_REPLIED,
307 IP_VS_SCTP_S_COOKIE_WAIT,
308 IP_VS_SCTP_S_COOKIE,
309 IP_VS_SCTP_S_COOKIE_ECHOED,
310 IP_VS_SCTP_S_ESTABLISHED,
311 IP_VS_SCTP_S_SHUTDOWN_SENT,
312 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
313 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
314 IP_VS_SCTP_S_REJECTED,
315 IP_VS_SCTP_S_CLOSED,
316 IP_VS_SCTP_S_LAST
317};
318
319/* Connection templates use bits from state */
320#define IP_VS_CTPL_S_NONE 0x0000
321#define IP_VS_CTPL_S_ASSURED 0x0001
322#define IP_VS_CTPL_S_LAST 0x0002
323
324/* Delta sequence info structure
325 * Each ip_vs_conn has 2 (output AND input seq. changes).
326 * Only used in the VS/NAT.
327 */
328struct ip_vs_seq {
329 __u32 init_seq; /* Add delta from this seq */
330 __u32 delta; /* Delta in sequence numbers */
331 __u32 previous_delta; /* Delta in sequence numbers
332 * before last resized pkt */
333};
334
335/* counters per cpu */
336struct ip_vs_counters {
337 u64_stats_t conns; /* connections scheduled */
338 u64_stats_t inpkts; /* incoming packets */
339 u64_stats_t outpkts; /* outgoing packets */
340 u64_stats_t inbytes; /* incoming bytes */
341 u64_stats_t outbytes; /* outgoing bytes */
342};
343/* Stats per cpu */
344struct ip_vs_cpu_stats {
345 struct ip_vs_counters cnt;
346 struct u64_stats_sync syncp;
347};
348
349/* Default nice for estimator kthreads */
350#define IPVS_EST_NICE 0
351
352/* IPVS statistics objects */
353struct ip_vs_estimator {
354 struct hlist_node list;
355
356 u64 last_inbytes;
357 u64 last_outbytes;
358 u64 last_conns;
359 u64 last_inpkts;
360 u64 last_outpkts;
361
362 u64 cps;
363 u64 inpps;
364 u64 outpps;
365 u64 inbps;
366 u64 outbps;
367
368 s32 ktid:16, /* kthread ID, -1=temp list */
369 ktrow:8, /* row/tick ID for kthread */
370 ktcid:8; /* chain ID for kthread tick */
371};
372
373/*
374 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
375 */
376struct ip_vs_kstats {
377 u64 conns; /* connections scheduled */
378 u64 inpkts; /* incoming packets */
379 u64 outpkts; /* outgoing packets */
380 u64 inbytes; /* incoming bytes */
381 u64 outbytes; /* outgoing bytes */
382
383 u64 cps; /* current connection rate */
384 u64 inpps; /* current in packet rate */
385 u64 outpps; /* current out packet rate */
386 u64 inbps; /* current in byte rate */
387 u64 outbps; /* current out byte rate */
388};
389
390struct ip_vs_stats {
391 struct ip_vs_kstats kstats; /* kernel statistics */
392 struct ip_vs_estimator est; /* estimator */
393 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
394 spinlock_t lock; /* spin lock */
395 struct ip_vs_kstats kstats0; /* reset values */
396};
397
398struct ip_vs_stats_rcu {
399 struct ip_vs_stats s;
400 struct rcu_head rcu_head;
401};
402
403int ip_vs_stats_init_alloc(struct ip_vs_stats *s);
404struct ip_vs_stats *ip_vs_stats_alloc(void);
405void ip_vs_stats_release(struct ip_vs_stats *stats);
406void ip_vs_stats_free(struct ip_vs_stats *stats);
407
408/* Process estimators in multiple timer ticks (20/50/100, see ktrow) */
409#define IPVS_EST_NTICKS 50
410/* Estimation uses a 2-second period containing ticks (in jiffies) */
411#define IPVS_EST_TICK ((2 * HZ) / IPVS_EST_NTICKS)
412
413/* Limit of CPU load per kthread (8 for 12.5%), ratio of CPU capacity (1/C).
414 * Value of 4 and above ensures kthreads will take work without exceeding
415 * the CPU capacity under different circumstances.
416 */
417#define IPVS_EST_LOAD_DIVISOR 8
418
419/* Kthreads should not have work that exceeds the CPU load above 50% */
420#define IPVS_EST_CPU_KTHREADS (IPVS_EST_LOAD_DIVISOR / 2)
421
422/* Desired number of chains per timer tick (chain load factor in 100us units),
423 * 48=4.8ms of 40ms tick (12% CPU usage):
424 * 2 sec * 1000 ms in sec * 10 (100us in ms) / 8 (12.5%) / 50
425 */
426#define IPVS_EST_CHAIN_FACTOR \
427 ALIGN_DOWN(2 * 1000 * 10 / IPVS_EST_LOAD_DIVISOR / IPVS_EST_NTICKS, 8)
428
429/* Compiled number of chains per tick
430 * The defines should match cond_resched_rcu
431 */
432#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
433#define IPVS_EST_TICK_CHAINS IPVS_EST_CHAIN_FACTOR
434#else
435#define IPVS_EST_TICK_CHAINS 1
436#endif
437
438#if IPVS_EST_NTICKS > 127
439#error Too many timer ticks for ktrow
440#endif
441
442/* Multiple chains processed in same tick */
443struct ip_vs_est_tick_data {
444 struct rcu_head rcu_head;
445 struct hlist_head chains[IPVS_EST_TICK_CHAINS];
446 DECLARE_BITMAP(present, IPVS_EST_TICK_CHAINS);
447 DECLARE_BITMAP(full, IPVS_EST_TICK_CHAINS);
448 int chain_len[IPVS_EST_TICK_CHAINS];
449};
450
451/* Context for estimation kthread */
452struct ip_vs_est_kt_data {
453 struct netns_ipvs *ipvs;
454 struct task_struct *task; /* task if running */
455 struct ip_vs_est_tick_data __rcu *ticks[IPVS_EST_NTICKS];
456 DECLARE_BITMAP(avail, IPVS_EST_NTICKS); /* tick has space for ests */
457 unsigned long est_timer; /* estimation timer (jiffies) */
458 struct ip_vs_stats *calc_stats; /* Used for calculation */
459 int tick_len[IPVS_EST_NTICKS]; /* est count */
460 int id; /* ktid per netns */
461 int chain_max; /* max ests per tick chain */
462 int tick_max; /* max ests per tick */
463 int est_count; /* attached ests to kthread */
464 int est_max_count; /* max ests per kthread */
465 int add_row; /* row for new ests */
466 int est_row; /* estimated row */
467};
468
469struct dst_entry;
470struct iphdr;
471struct ip_vs_conn;
472struct ip_vs_app;
473struct sk_buff;
474struct ip_vs_proto_data;
475
476struct ip_vs_protocol {
477 struct ip_vs_protocol *next;
478 char *name;
479 u16 protocol;
480 u16 num_states;
481 int dont_defrag;
482
483 void (*init)(struct ip_vs_protocol *pp);
484
485 void (*exit)(struct ip_vs_protocol *pp);
486
487 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
488
489 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
490
491 int (*conn_schedule)(struct netns_ipvs *ipvs,
492 int af, struct sk_buff *skb,
493 struct ip_vs_proto_data *pd,
494 int *verdict, struct ip_vs_conn **cpp,
495 struct ip_vs_iphdr *iph);
496
497 struct ip_vs_conn *
498 (*conn_in_get)(struct netns_ipvs *ipvs,
499 int af,
500 const struct sk_buff *skb,
501 const struct ip_vs_iphdr *iph);
502
503 struct ip_vs_conn *
504 (*conn_out_get)(struct netns_ipvs *ipvs,
505 int af,
506 const struct sk_buff *skb,
507 const struct ip_vs_iphdr *iph);
508
509 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
510 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
511
512 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
513 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
514
515 const char *(*state_name)(int state);
516
517 void (*state_transition)(struct ip_vs_conn *cp, int direction,
518 const struct sk_buff *skb,
519 struct ip_vs_proto_data *pd);
520
521 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
522
523 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
524
525 int (*app_conn_bind)(struct ip_vs_conn *cp);
526
527 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
528 const struct sk_buff *skb,
529 int offset,
530 const char *msg);
531
532 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
533};
534
535/* protocol data per netns */
536struct ip_vs_proto_data {
537 struct ip_vs_proto_data *next;
538 struct ip_vs_protocol *pp;
539 int *timeout_table; /* protocol timeout table */
540 atomic_t appcnt; /* counter of proto app incs. */
541 struct tcp_states_t *tcp_state_table;
542};
543
544struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
545struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
546 unsigned short proto);
547
548struct ip_vs_conn_param {
549 struct netns_ipvs *ipvs;
550 const union nf_inet_addr *caddr;
551 const union nf_inet_addr *vaddr;
552 __be16 cport;
553 __be16 vport;
554 __u16 protocol;
555 u16 af;
556
557 const struct ip_vs_pe *pe;
558 char *pe_data;
559 __u8 pe_data_len;
560};
561
562/* IP_VS structure allocated for each dynamically scheduled connection */
563struct ip_vs_conn {
564 struct hlist_node c_list; /* hashed list heads */
565 /* Protocol, addresses and port numbers */
566 __be16 cport;
567 __be16 dport;
568 __be16 vport;
569 u16 af; /* address family */
570 union nf_inet_addr caddr; /* client address */
571 union nf_inet_addr vaddr; /* virtual address */
572 union nf_inet_addr daddr; /* destination address */
573 volatile __u32 flags; /* status flags */
574 __u16 protocol; /* Which protocol (TCP/UDP) */
575 __u16 daf; /* Address family of the dest */
576 struct netns_ipvs *ipvs;
577
578 /* counter and timer */
579 refcount_t refcnt; /* reference count */
580 struct timer_list timer; /* Expiration timer */
581 volatile unsigned long timeout; /* timeout */
582
583 /* Flags and state transition */
584 spinlock_t lock; /* lock for state transition */
585 volatile __u16 state; /* state info */
586 volatile __u16 old_state; /* old state, to be used for
587 * state transition triggered
588 * synchronization
589 */
590 __u32 fwmark; /* Fire wall mark from skb */
591 unsigned long sync_endtime; /* jiffies + sent_retries */
592
593 /* Control members */
594 struct ip_vs_conn *control; /* Master control connection */
595 atomic_t n_control; /* Number of controlled ones */
596 struct ip_vs_dest *dest; /* real server */
597 atomic_t in_pkts; /* incoming packet counter */
598
599 /* Packet transmitter for different forwarding methods. If it
600 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
601 * otherwise this must be changed to a sk_buff **.
602 * NF_ACCEPT can be returned when destination is local.
603 */
604 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
605 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
606
607 /* Note: we can group the following members into a structure,
608 * in order to save more space, and the following members are
609 * only used in VS/NAT anyway
610 */
611 struct ip_vs_app *app; /* bound ip_vs_app object */
612 void *app_data; /* Application private data */
613 struct_group(sync_conn_opt,
614 struct ip_vs_seq in_seq; /* incoming seq. struct */
615 struct ip_vs_seq out_seq; /* outgoing seq. struct */
616 );
617
618 const struct ip_vs_pe *pe;
619 char *pe_data;
620 __u8 pe_data_len;
621
622 struct rcu_head rcu_head;
623};
624
625/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
626 * for IPv6 support.
627 *
628 * We need these to conveniently pass around service and destination
629 * options, but unfortunately, we also need to keep the old definitions to
630 * maintain userspace backwards compatibility for the setsockopt interface.
631 */
632struct ip_vs_service_user_kern {
633 /* virtual service addresses */
634 u16 af;
635 u16 protocol;
636 union nf_inet_addr addr; /* virtual ip address */
637 __be16 port;
638 u32 fwmark; /* firewall mark of service */
639
640 /* virtual service options */
641 char *sched_name;
642 char *pe_name;
643 unsigned int flags; /* virtual service flags */
644 unsigned int timeout; /* persistent timeout in sec */
645 __be32 netmask; /* persistent netmask or plen */
646};
647
648
649struct ip_vs_dest_user_kern {
650 /* destination server address */
651 union nf_inet_addr addr;
652 __be16 port;
653
654 /* real server options */
655 unsigned int conn_flags; /* connection flags */
656 int weight; /* destination weight */
657
658 /* thresholds for active connections */
659 u32 u_threshold; /* upper threshold */
660 u32 l_threshold; /* lower threshold */
661
662 /* Address family of addr */
663 u16 af;
664
665 u16 tun_type; /* tunnel type */
666 __be16 tun_port; /* tunnel port */
667 u16 tun_flags; /* tunnel flags */
668};
669
670
671/*
672 * The information about the virtual service offered to the net and the
673 * forwarding entries.
674 */
675struct ip_vs_service {
676 struct hlist_node s_list; /* for normal service table */
677 struct hlist_node f_list; /* for fwmark-based service table */
678 atomic_t refcnt; /* reference counter */
679
680 u16 af; /* address family */
681 __u16 protocol; /* which protocol (TCP/UDP) */
682 union nf_inet_addr addr; /* IP address for virtual service */
683 __be16 port; /* port number for the service */
684 __u32 fwmark; /* firewall mark of the service */
685 unsigned int flags; /* service status flags */
686 unsigned int timeout; /* persistent timeout in ticks */
687 __be32 netmask; /* grouping granularity, mask/plen */
688 struct netns_ipvs *ipvs;
689
690 struct list_head destinations; /* real server d-linked list */
691 __u32 num_dests; /* number of servers */
692 struct ip_vs_stats stats; /* statistics for the service */
693
694 /* for scheduling */
695 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
696 spinlock_t sched_lock; /* lock sched_data */
697 void *sched_data; /* scheduler application data */
698
699 /* alternate persistence engine */
700 struct ip_vs_pe __rcu *pe;
701 int conntrack_afmask;
702
703 struct rcu_head rcu_head;
704};
705
706/* Information for cached dst */
707struct ip_vs_dest_dst {
708 struct dst_entry *dst_cache; /* destination cache entry */
709 u32 dst_cookie;
710 union nf_inet_addr dst_saddr;
711 struct rcu_head rcu_head;
712};
713
714/* The real server destination forwarding entry with ip address, port number,
715 * and so on.
716 */
717struct ip_vs_dest {
718 struct list_head n_list; /* for the dests in the service */
719 struct hlist_node d_list; /* for table with all the dests */
720
721 u16 af; /* address family */
722 __be16 port; /* port number of the server */
723 union nf_inet_addr addr; /* IP address of the server */
724 volatile unsigned int flags; /* dest status flags */
725 atomic_t conn_flags; /* flags to copy to conn */
726 atomic_t weight; /* server weight */
727 atomic_t last_weight; /* server latest weight */
728 __u16 tun_type; /* tunnel type */
729 __be16 tun_port; /* tunnel port */
730 __u16 tun_flags; /* tunnel flags */
731
732 refcount_t refcnt; /* reference counter */
733 struct ip_vs_stats stats; /* statistics */
734 unsigned long idle_start; /* start time, jiffies */
735
736 /* connection counters and thresholds */
737 atomic_t activeconns; /* active connections */
738 atomic_t inactconns; /* inactive connections */
739 atomic_t persistconns; /* persistent connections */
740 __u32 u_threshold; /* upper threshold */
741 __u32 l_threshold; /* lower threshold */
742
743 /* for destination cache */
744 spinlock_t dst_lock; /* lock of dst_cache */
745 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
746
747 /* for virtual service */
748 struct ip_vs_service __rcu *svc; /* service it belongs to */
749 __u16 protocol; /* which protocol (TCP/UDP) */
750 __be16 vport; /* virtual port number */
751 union nf_inet_addr vaddr; /* virtual IP address */
752 __u32 vfwmark; /* firewall mark of service */
753
754 struct rcu_head rcu_head;
755 struct list_head t_list; /* in dest_trash */
756 unsigned int in_rs_table:1; /* we are in rs_table */
757};
758
759/* The scheduler object */
760struct ip_vs_scheduler {
761 struct list_head n_list; /* d-linked list head */
762 char *name; /* scheduler name */
763 atomic_t refcnt; /* reference counter */
764 struct module *module; /* THIS_MODULE/NULL */
765
766 /* scheduler initializing service */
767 int (*init_service)(struct ip_vs_service *svc);
768 /* scheduling service finish */
769 void (*done_service)(struct ip_vs_service *svc);
770 /* dest is linked */
771 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
772 /* dest is unlinked */
773 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
774 /* dest is updated */
775 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
776
777 /* selecting a server from the given service */
778 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
779 const struct sk_buff *skb,
780 struct ip_vs_iphdr *iph);
781};
782
783/* The persistence engine object */
784struct ip_vs_pe {
785 struct list_head n_list; /* d-linked list head */
786 char *name; /* scheduler name */
787 atomic_t refcnt; /* reference counter */
788 struct module *module; /* THIS_MODULE/NULL */
789
790 /* get the connection template, if any */
791 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
792 bool (*ct_match)(const struct ip_vs_conn_param *p,
793 struct ip_vs_conn *ct);
794 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
795 bool inverse);
796 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
797 /* create connections for real-server outgoing packets */
798 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
799 struct ip_vs_dest *dest,
800 struct sk_buff *skb,
801 const struct ip_vs_iphdr *iph,
802 __be16 dport, __be16 cport);
803};
804
805/* The application module object (a.k.a. app incarnation) */
806struct ip_vs_app {
807 struct list_head a_list; /* member in app list */
808 int type; /* IP_VS_APP_TYPE_xxx */
809 char *name; /* application module name */
810 __u16 protocol;
811 struct module *module; /* THIS_MODULE/NULL */
812 struct list_head incs_list; /* list of incarnations */
813
814 /* members for application incarnations */
815 struct list_head p_list; /* member in proto app list */
816 struct ip_vs_app *app; /* its real application */
817 __be16 port; /* port number in net order */
818 atomic_t usecnt; /* usage counter */
819 struct rcu_head rcu_head;
820
821 /* output hook: Process packet in inout direction, diff set for TCP.
822 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
823 * 2=Mangled but checksum was not updated
824 */
825 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
826 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
827
828 /* input hook: Process packet in outin direction, diff set for TCP.
829 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
830 * 2=Mangled but checksum was not updated
831 */
832 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
833 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
834
835 /* ip_vs_app initializer */
836 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
837
838 /* ip_vs_app finish */
839 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
840
841
842 /* not used now */
843 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
844 struct ip_vs_protocol *);
845
846 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
847
848 int * timeout_table;
849 int * timeouts;
850 int timeouts_size;
851
852 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
853 int *verdict, struct ip_vs_conn **cpp);
854
855 struct ip_vs_conn *
856 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
857 const struct iphdr *iph, int inverse);
858
859 struct ip_vs_conn *
860 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
861 const struct iphdr *iph, int inverse);
862
863 int (*state_transition)(struct ip_vs_conn *cp, int direction,
864 const struct sk_buff *skb,
865 struct ip_vs_app *app);
866
867 void (*timeout_change)(struct ip_vs_app *app, int flags);
868};
869
870struct ipvs_master_sync_state {
871 struct list_head sync_queue;
872 struct ip_vs_sync_buff *sync_buff;
873 unsigned long sync_queue_len;
874 unsigned int sync_queue_delay;
875 struct delayed_work master_wakeup_work;
876 struct netns_ipvs *ipvs;
877};
878
879struct ip_vs_sync_thread_data;
880
881/* How much time to keep dests in trash */
882#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
883
884struct ipvs_sync_daemon_cfg {
885 union nf_inet_addr mcast_group;
886 int syncid;
887 u16 sync_maxlen;
888 u16 mcast_port;
889 u8 mcast_af;
890 u8 mcast_ttl;
891 /* multicast interface name */
892 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
893};
894
895/* IPVS in network namespace */
896struct netns_ipvs {
897 int gen; /* Generation */
898 int enable; /* enable like nf_hooks do */
899 /* Hash table: for real service lookups */
900 #define IP_VS_RTAB_BITS 4
901 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
902 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
903
904 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
905 /* ip_vs_app */
906 struct list_head app_list;
907 /* ip_vs_proto */
908 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
909 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
910 /* ip_vs_proto_tcp */
911#ifdef CONFIG_IP_VS_PROTO_TCP
912 #define TCP_APP_TAB_BITS 4
913 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
914 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
915 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
916#endif
917 /* ip_vs_proto_udp */
918#ifdef CONFIG_IP_VS_PROTO_UDP
919 #define UDP_APP_TAB_BITS 4
920 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
921 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
922 struct list_head udp_apps[UDP_APP_TAB_SIZE];
923#endif
924 /* ip_vs_proto_sctp */
925#ifdef CONFIG_IP_VS_PROTO_SCTP
926 #define SCTP_APP_TAB_BITS 4
927 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
928 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
929 /* Hash table for SCTP application incarnations */
930 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
931#endif
932 /* ip_vs_conn */
933 atomic_t conn_count; /* connection counter */
934
935 /* ip_vs_ctl */
936 struct ip_vs_stats_rcu *tot_stats; /* Statistics & est. */
937
938 int num_services; /* no of virtual services */
939 int num_services6; /* IPv6 virtual services */
940
941 /* Trash for destinations */
942 struct list_head dest_trash;
943 spinlock_t dest_trash_lock;
944 struct timer_list dest_trash_timer; /* expiration timer */
945 /* Service counters */
946 atomic_t ftpsvc_counter;
947 atomic_t nullsvc_counter;
948 atomic_t conn_out_counter;
949
950#ifdef CONFIG_SYSCTL
951 /* delayed work for expiring no dest connections */
952 struct delayed_work expire_nodest_conn_work;
953 /* 1/rate drop and drop-entry variables */
954 struct delayed_work defense_work; /* Work handler */
955 int drop_rate;
956 int drop_counter;
957 int old_secure_tcp;
958 atomic_t dropentry;
959 /* locks in ctl.c */
960 spinlock_t dropentry_lock; /* drop entry handling */
961 spinlock_t droppacket_lock; /* drop packet handling */
962 spinlock_t securetcp_lock; /* state and timeout tables */
963
964 /* sys-ctl struct */
965 struct ctl_table_header *sysctl_hdr;
966 struct ctl_table *sysctl_tbl;
967#endif
968
969 /* sysctl variables */
970 int sysctl_amemthresh;
971 int sysctl_am_droprate;
972 int sysctl_drop_entry;
973 int sysctl_drop_packet;
974 int sysctl_secure_tcp;
975#ifdef CONFIG_IP_VS_NFCT
976 int sysctl_conntrack;
977#endif
978 int sysctl_snat_reroute;
979 int sysctl_sync_ver;
980 int sysctl_sync_ports;
981 int sysctl_sync_persist_mode;
982 unsigned long sysctl_sync_qlen_max;
983 int sysctl_sync_sock_size;
984 int sysctl_cache_bypass;
985 int sysctl_expire_nodest_conn;
986 int sysctl_sloppy_tcp;
987 int sysctl_sloppy_sctp;
988 int sysctl_expire_quiescent_template;
989 int sysctl_sync_threshold[2];
990 unsigned int sysctl_sync_refresh_period;
991 int sysctl_sync_retries;
992 int sysctl_nat_icmp_send;
993 int sysctl_pmtu_disc;
994 int sysctl_backup_only;
995 int sysctl_conn_reuse_mode;
996 int sysctl_schedule_icmp;
997 int sysctl_ignore_tunneled;
998 int sysctl_run_estimation;
999#ifdef CONFIG_SYSCTL
1000 cpumask_var_t sysctl_est_cpulist; /* kthread cpumask */
1001 int est_cpulist_valid; /* cpulist set */
1002 int sysctl_est_nice; /* kthread nice */
1003 int est_stopped; /* stop tasks */
1004#endif
1005
1006 /* ip_vs_lblc */
1007 int sysctl_lblc_expiration;
1008 struct ctl_table_header *lblc_ctl_header;
1009 struct ctl_table *lblc_ctl_table;
1010 /* ip_vs_lblcr */
1011 int sysctl_lblcr_expiration;
1012 struct ctl_table_header *lblcr_ctl_header;
1013 struct ctl_table *lblcr_ctl_table;
1014 /* ip_vs_est */
1015 struct delayed_work est_reload_work;/* Reload kthread tasks */
1016 struct mutex est_mutex; /* protect kthread tasks */
1017 struct hlist_head est_temp_list; /* Ests during calc phase */
1018 struct ip_vs_est_kt_data **est_kt_arr; /* Array of kthread data ptrs */
1019 unsigned long est_max_threads;/* Hard limit of kthreads */
1020 int est_calc_phase; /* Calculation phase */
1021 int est_chain_max; /* Calculated chain_max */
1022 int est_kt_count; /* Allocated ptrs */
1023 int est_add_ktid; /* ktid where to add ests */
1024 atomic_t est_genid; /* kthreads reload genid */
1025 atomic_t est_genid_done; /* applied genid */
1026 /* ip_vs_sync */
1027 spinlock_t sync_lock;
1028 struct ipvs_master_sync_state *ms;
1029 spinlock_t sync_buff_lock;
1030 struct ip_vs_sync_thread_data *master_tinfo;
1031 struct ip_vs_sync_thread_data *backup_tinfo;
1032 int threads_mask;
1033 volatile int sync_state;
1034 struct mutex sync_mutex;
1035 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
1036 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
1037 /* net name space ptr */
1038 struct net *net; /* Needed by timer routines */
1039 /* Number of heterogeneous destinations, needed because heterogeneous
1040 * are not supported when synchronization is enabled.
1041 */
1042 unsigned int mixed_address_family_dests;
1043 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
1044};
1045
1046#define DEFAULT_SYNC_THRESHOLD 3
1047#define DEFAULT_SYNC_PERIOD 50
1048#define DEFAULT_SYNC_VER 1
1049#define DEFAULT_SLOPPY_TCP 0
1050#define DEFAULT_SLOPPY_SCTP 0
1051#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
1052#define DEFAULT_SYNC_RETRIES 0
1053#define IPVS_SYNC_WAKEUP_RATE 8
1054#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1055#define IPVS_SYNC_SEND_DELAY (HZ / 50)
1056#define IPVS_SYNC_CHECK_PERIOD HZ
1057#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1058#define IPVS_SYNC_PORTS_MAX (1 << 6)
1059
1060#ifdef CONFIG_SYSCTL
1061
1062static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1063{
1064 return ipvs->sysctl_sync_threshold[0];
1065}
1066
1067static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1068{
1069 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
1070}
1071
1072static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1073{
1074 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
1075}
1076
1077static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1078{
1079 return ipvs->sysctl_sync_retries;
1080}
1081
1082static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1083{
1084 return ipvs->sysctl_sync_ver;
1085}
1086
1087static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1088{
1089 return ipvs->sysctl_sloppy_tcp;
1090}
1091
1092static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1093{
1094 return ipvs->sysctl_sloppy_sctp;
1095}
1096
1097static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1098{
1099 return READ_ONCE(ipvs->sysctl_sync_ports);
1100}
1101
1102static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1103{
1104 return ipvs->sysctl_sync_persist_mode;
1105}
1106
1107static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1108{
1109 return ipvs->sysctl_sync_qlen_max;
1110}
1111
1112static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1113{
1114 return ipvs->sysctl_sync_sock_size;
1115}
1116
1117static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1118{
1119 return ipvs->sysctl_pmtu_disc;
1120}
1121
1122static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1123{
1124 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1125 ipvs->sysctl_backup_only;
1126}
1127
1128static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1129{
1130 return ipvs->sysctl_conn_reuse_mode;
1131}
1132
1133static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1134{
1135 return ipvs->sysctl_expire_nodest_conn;
1136}
1137
1138static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1139{
1140 return ipvs->sysctl_schedule_icmp;
1141}
1142
1143static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1144{
1145 return ipvs->sysctl_ignore_tunneled;
1146}
1147
1148static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1149{
1150 return ipvs->sysctl_cache_bypass;
1151}
1152
1153static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1154{
1155 return ipvs->sysctl_run_estimation;
1156}
1157
1158static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
1159{
1160 if (ipvs->est_cpulist_valid)
1161 return ipvs->sysctl_est_cpulist;
1162 else
1163 return housekeeping_cpumask(HK_TYPE_KTHREAD);
1164}
1165
1166static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1167{
1168 return ipvs->sysctl_est_nice;
1169}
1170
1171#else
1172
1173static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1174{
1175 return DEFAULT_SYNC_THRESHOLD;
1176}
1177
1178static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1179{
1180 return DEFAULT_SYNC_PERIOD;
1181}
1182
1183static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1184{
1185 return DEFAULT_SYNC_REFRESH_PERIOD;
1186}
1187
1188static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1189{
1190 return DEFAULT_SYNC_RETRIES & 3;
1191}
1192
1193static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1194{
1195 return DEFAULT_SYNC_VER;
1196}
1197
1198static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1199{
1200 return DEFAULT_SLOPPY_TCP;
1201}
1202
1203static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1204{
1205 return DEFAULT_SLOPPY_SCTP;
1206}
1207
1208static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1209{
1210 return 1;
1211}
1212
1213static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1214{
1215 return 0;
1216}
1217
1218static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1219{
1220 return IPVS_SYNC_QLEN_MAX;
1221}
1222
1223static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1224{
1225 return 0;
1226}
1227
1228static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1229{
1230 return 1;
1231}
1232
1233static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1234{
1235 return 0;
1236}
1237
1238static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1239{
1240 return 1;
1241}
1242
1243static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1244{
1245 return 0;
1246}
1247
1248static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1249{
1250 return 0;
1251}
1252
1253static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1254{
1255 return 0;
1256}
1257
1258static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1259{
1260 return 0;
1261}
1262
1263static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1264{
1265 return 1;
1266}
1267
1268static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
1269{
1270 return housekeeping_cpumask(HK_TYPE_KTHREAD);
1271}
1272
1273static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1274{
1275 return IPVS_EST_NICE;
1276}
1277
1278#endif
1279
1280/* IPVS core functions
1281 * (from ip_vs_core.c)
1282 */
1283const char *ip_vs_proto_name(unsigned int proto);
1284void ip_vs_init_hash_table(struct list_head *table, int rows);
1285struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1286 struct ip_vs_dest *dest,
1287 struct sk_buff *skb,
1288 const struct ip_vs_iphdr *iph,
1289 __be16 dport,
1290 __be16 cport);
1291#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1292
1293#define IP_VS_APP_TYPE_FTP 1
1294
1295/* ip_vs_conn handling functions
1296 * (from ip_vs_conn.c)
1297 */
1298enum {
1299 IP_VS_DIR_INPUT = 0,
1300 IP_VS_DIR_OUTPUT,
1301 IP_VS_DIR_INPUT_ONLY,
1302 IP_VS_DIR_LAST,
1303};
1304
1305static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1306 const union nf_inet_addr *caddr,
1307 __be16 cport,
1308 const union nf_inet_addr *vaddr,
1309 __be16 vport,
1310 struct ip_vs_conn_param *p)
1311{
1312 p->ipvs = ipvs;
1313 p->af = af;
1314 p->protocol = protocol;
1315 p->caddr = caddr;
1316 p->cport = cport;
1317 p->vaddr = vaddr;
1318 p->vport = vport;
1319 p->pe = NULL;
1320 p->pe_data = NULL;
1321}
1322
1323struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1324struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1325
1326struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1327 const struct sk_buff *skb,
1328 const struct ip_vs_iphdr *iph);
1329
1330struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1331
1332struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1333 const struct sk_buff *skb,
1334 const struct ip_vs_iphdr *iph);
1335
1336/* Get reference to gain full access to conn.
1337 * By default, RCU read-side critical sections have access only to
1338 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1339 */
1340static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1341{
1342 return refcount_inc_not_zero(&cp->refcnt);
1343}
1344
1345/* put back the conn without restarting its timer */
1346static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1347{
1348 smp_mb__before_atomic();
1349 refcount_dec(&cp->refcnt);
1350}
1351void ip_vs_conn_put(struct ip_vs_conn *cp);
1352void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1353
1354struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1355 const union nf_inet_addr *daddr,
1356 __be16 dport, unsigned int flags,
1357 struct ip_vs_dest *dest, __u32 fwmark);
1358void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1359
1360const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1361
1362void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1363int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1364void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1365int ip_vs_conn_init(void);
1366void ip_vs_conn_cleanup(void);
1367
1368static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1369{
1370 struct ip_vs_conn *ctl_cp = cp->control;
1371 if (!ctl_cp) {
1372 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1373 "%s:%d to %s:%d\n",
1374 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1375 ntohs(cp->cport),
1376 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1377 ntohs(cp->vport));
1378
1379 return;
1380 }
1381
1382 IP_VS_DBG_BUF(7, "DELeting control for: "
1383 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1384 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1385 ntohs(cp->cport),
1386 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1387 ntohs(ctl_cp->cport));
1388
1389 cp->control = NULL;
1390 if (atomic_read(&ctl_cp->n_control) == 0) {
1391 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1392 "%s:%d to %s:%d\n",
1393 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1394 ntohs(cp->cport),
1395 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1396 ntohs(cp->vport));
1397
1398 return;
1399 }
1400 atomic_dec(&ctl_cp->n_control);
1401}
1402
1403static inline void
1404ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1405{
1406 if (cp->control) {
1407 IP_VS_ERR_BUF("request control ADD for already controlled: "
1408 "%s:%d to %s:%d\n",
1409 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1410 ntohs(cp->cport),
1411 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1412 ntohs(cp->vport));
1413
1414 ip_vs_control_del(cp);
1415 }
1416
1417 IP_VS_DBG_BUF(7, "ADDing control for: "
1418 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1419 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1420 ntohs(cp->cport),
1421 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1422 ntohs(ctl_cp->cport));
1423
1424 cp->control = ctl_cp;
1425 atomic_inc(&ctl_cp->n_control);
1426}
1427
1428/* Mark our template as assured */
1429static inline void
1430ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1431{
1432 struct ip_vs_conn *ct = cp->control;
1433
1434 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1435 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1436 ct->state |= IP_VS_CTPL_S_ASSURED;
1437}
1438
1439/* IPVS netns init & cleanup functions */
1440int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1441int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1442int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1443int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1444int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1445int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1446void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1447void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1448void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1449void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1450void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1451void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1452void ip_vs_service_nets_cleanup(struct list_head *net_list);
1453
1454/* IPVS application functions
1455 * (from ip_vs_app.c)
1456 */
1457#define IP_VS_APP_MAX_PORTS 8
1458struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1459void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1460int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1461void ip_vs_unbind_app(struct ip_vs_conn *cp);
1462int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1463 __u16 port);
1464int ip_vs_app_inc_get(struct ip_vs_app *inc);
1465void ip_vs_app_inc_put(struct ip_vs_app *inc);
1466
1467int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1468 struct ip_vs_iphdr *ipvsh);
1469int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1470 struct ip_vs_iphdr *ipvsh);
1471
1472int register_ip_vs_pe(struct ip_vs_pe *pe);
1473int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1474struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1475struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1476
1477/* Use a #define to avoid all of module.h just for these trivial ops */
1478#define ip_vs_pe_get(pe) \
1479 if (pe && pe->module) \
1480 __module_get(pe->module);
1481
1482#define ip_vs_pe_put(pe) \
1483 if (pe && pe->module) \
1484 module_put(pe->module);
1485
1486/* IPVS protocol functions (from ip_vs_proto.c) */
1487int ip_vs_protocol_init(void);
1488void ip_vs_protocol_cleanup(void);
1489void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1490int *ip_vs_create_timeout_table(int *table, int size);
1491void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1492 const struct sk_buff *skb, int offset,
1493 const char *msg);
1494
1495extern struct ip_vs_protocol ip_vs_protocol_tcp;
1496extern struct ip_vs_protocol ip_vs_protocol_udp;
1497extern struct ip_vs_protocol ip_vs_protocol_icmp;
1498extern struct ip_vs_protocol ip_vs_protocol_esp;
1499extern struct ip_vs_protocol ip_vs_protocol_ah;
1500extern struct ip_vs_protocol ip_vs_protocol_sctp;
1501
1502/* Registering/unregistering scheduler functions
1503 * (from ip_vs_sched.c)
1504 */
1505int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1506int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1507int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1508 struct ip_vs_scheduler *scheduler);
1509void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1510 struct ip_vs_scheduler *sched);
1511struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1512void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1513struct ip_vs_conn *
1514ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1515 struct ip_vs_proto_data *pd, int *ignored,
1516 struct ip_vs_iphdr *iph);
1517int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1518 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1519
1520void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1521
1522/* IPVS control data and functions (from ip_vs_ctl.c) */
1523extern struct ip_vs_stats ip_vs_stats;
1524extern int sysctl_ip_vs_sync_ver;
1525
1526struct ip_vs_service *
1527ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1528 const union nf_inet_addr *vaddr, __be16 vport);
1529
1530bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1531 const union nf_inet_addr *daddr, __be16 dport);
1532
1533struct ip_vs_dest *
1534ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1535 const union nf_inet_addr *daddr, __be16 dport);
1536struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1537 const union nf_inet_addr *daddr,
1538 __be16 tun_port);
1539
1540int ip_vs_use_count_inc(void);
1541void ip_vs_use_count_dec(void);
1542int ip_vs_register_nl_ioctl(void);
1543void ip_vs_unregister_nl_ioctl(void);
1544int ip_vs_control_init(void);
1545void ip_vs_control_cleanup(void);
1546struct ip_vs_dest *
1547ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1548 const union nf_inet_addr *daddr, __be16 dport,
1549 const union nf_inet_addr *vaddr, __be16 vport,
1550 __u16 protocol, __u32 fwmark, __u32 flags);
1551void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1552
1553static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1554{
1555 refcount_inc(&dest->refcnt);
1556}
1557
1558static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1559{
1560 smp_mb__before_atomic();
1561 refcount_dec(&dest->refcnt);
1562}
1563
1564static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1565{
1566 if (refcount_dec_and_test(&dest->refcnt))
1567 kfree(dest);
1568}
1569
1570/* IPVS sync daemon data and function prototypes
1571 * (from ip_vs_sync.c)
1572 */
1573int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1574 int state);
1575int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1576void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1577
1578/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1579int ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1580void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1581void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1582void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1583void ip_vs_est_reload_start(struct netns_ipvs *ipvs);
1584int ip_vs_est_kthread_start(struct netns_ipvs *ipvs,
1585 struct ip_vs_est_kt_data *kd);
1586void ip_vs_est_kthread_stop(struct ip_vs_est_kt_data *kd);
1587
1588static inline void ip_vs_est_stopped_recalc(struct netns_ipvs *ipvs)
1589{
1590#ifdef CONFIG_SYSCTL
1591 /* Stop tasks while cpulist is empty or if disabled with flag */
1592 ipvs->est_stopped = !sysctl_run_estimation(ipvs) ||
1593 (ipvs->est_cpulist_valid &&
1594 cpumask_empty(sysctl_est_cpulist(ipvs)));
1595#endif
1596}
1597
1598static inline bool ip_vs_est_stopped(struct netns_ipvs *ipvs)
1599{
1600#ifdef CONFIG_SYSCTL
1601 return ipvs->est_stopped;
1602#else
1603 return false;
1604#endif
1605}
1606
1607static inline int ip_vs_est_max_threads(struct netns_ipvs *ipvs)
1608{
1609 unsigned int limit = IPVS_EST_CPU_KTHREADS *
1610 cpumask_weight(sysctl_est_cpulist(ipvs));
1611
1612 return max(1U, limit);
1613}
1614
1615/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1616int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1617 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1618int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1619 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1620int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1621 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1622int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1623 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1624int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1625 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1626int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1627 struct ip_vs_protocol *pp, int offset,
1628 unsigned int hooknum, struct ip_vs_iphdr *iph);
1629void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1630
1631#ifdef CONFIG_IP_VS_IPV6
1632int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1633 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1634int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1635 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1636int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1637 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1638int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1639 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1640int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1641 struct ip_vs_protocol *pp, int offset,
1642 unsigned int hooknum, struct ip_vs_iphdr *iph);
1643#endif
1644
1645#ifdef CONFIG_SYSCTL
1646/* This is a simple mechanism to ignore packets when
1647 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1648 * we start to drop 1/rate of the packets
1649 */
1650static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1651{
1652 if (!ipvs->drop_rate)
1653 return 0;
1654 if (--ipvs->drop_counter > 0)
1655 return 0;
1656 ipvs->drop_counter = ipvs->drop_rate;
1657 return 1;
1658}
1659#else
1660static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1661#endif
1662
1663#ifdef CONFIG_SYSCTL
1664/* Enqueue delayed work for expiring no dest connections
1665 * Only run when sysctl_expire_nodest=1
1666 */
1667static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1668{
1669 if (sysctl_expire_nodest_conn(ipvs))
1670 queue_delayed_work(system_long_wq,
1671 &ipvs->expire_nodest_conn_work, 1);
1672}
1673
1674void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1675#else
1676static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1677#endif
1678
1679#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1680 IP_VS_CONN_F_FWD_MASK)
1681
1682/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1683#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1684
1685static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1686{
1687 char fwd;
1688
1689 switch (IP_VS_FWD_METHOD(cp)) {
1690 case IP_VS_CONN_F_MASQ:
1691 fwd = 'M'; break;
1692 case IP_VS_CONN_F_LOCALNODE:
1693 fwd = 'L'; break;
1694 case IP_VS_CONN_F_TUNNEL:
1695 fwd = 'T'; break;
1696 case IP_VS_CONN_F_DROUTE:
1697 fwd = 'R'; break;
1698 case IP_VS_CONN_F_BYPASS:
1699 fwd = 'B'; break;
1700 default:
1701 fwd = '?'; break;
1702 }
1703 return fwd;
1704}
1705
1706void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1707 struct ip_vs_conn *cp, int dir);
1708
1709#ifdef CONFIG_IP_VS_IPV6
1710void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1711 struct ip_vs_conn *cp, int dir);
1712#endif
1713
1714__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1715
1716static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1717{
1718 __be32 diff[2] = { ~old, new };
1719
1720 return csum_partial(diff, sizeof(diff), oldsum);
1721}
1722
1723#ifdef CONFIG_IP_VS_IPV6
1724static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1725 __wsum oldsum)
1726{
1727 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1728 new[3], new[2], new[1], new[0] };
1729
1730 return csum_partial(diff, sizeof(diff), oldsum);
1731}
1732#endif
1733
1734static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1735{
1736 __be16 diff[2] = { ~old, new };
1737
1738 return csum_partial(diff, sizeof(diff), oldsum);
1739}
1740
1741/* Forget current conntrack (unconfirmed) and attach notrack entry */
1742static inline void ip_vs_notrack(struct sk_buff *skb)
1743{
1744#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1745 enum ip_conntrack_info ctinfo;
1746 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1747
1748 if (ct) {
1749 nf_conntrack_put(&ct->ct_general);
1750 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1751 }
1752#endif
1753}
1754
1755#ifdef CONFIG_IP_VS_NFCT
1756/* Netfilter connection tracking
1757 * (from ip_vs_nfct.c)
1758 */
1759static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1760{
1761#ifdef CONFIG_SYSCTL
1762 return ipvs->sysctl_conntrack;
1763#else
1764 return 0;
1765#endif
1766}
1767
1768void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1769 int outin);
1770int ip_vs_confirm_conntrack(struct sk_buff *skb);
1771void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1772 struct ip_vs_conn *cp, u_int8_t proto,
1773 const __be16 port, int from_rs);
1774void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1775
1776#else
1777
1778static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1779{
1780 return 0;
1781}
1782
1783static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1784 struct ip_vs_conn *cp, int outin)
1785{
1786}
1787
1788static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1789{
1790 return NF_ACCEPT;
1791}
1792
1793static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1794{
1795}
1796#endif /* CONFIG_IP_VS_NFCT */
1797
1798/* Using old conntrack that can not be redirected to another real server? */
1799static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1800 struct sk_buff *skb)
1801{
1802#ifdef CONFIG_IP_VS_NFCT
1803 enum ip_conntrack_info ctinfo;
1804 struct nf_conn *ct;
1805
1806 ct = nf_ct_get(skb, &ctinfo);
1807 if (ct && nf_ct_is_confirmed(ct))
1808 return true;
1809#endif
1810 return false;
1811}
1812
1813static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1814{
1815#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1816 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1817 int ret = 0;
1818
1819 if (!(svc->conntrack_afmask & afmask)) {
1820 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1821 if (ret >= 0)
1822 svc->conntrack_afmask |= afmask;
1823 }
1824 return ret;
1825#else
1826 return 0;
1827#endif
1828}
1829
1830static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1831{
1832#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1833 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1834
1835 if (svc->conntrack_afmask & afmask) {
1836 nf_ct_netns_put(svc->ipvs->net, svc->af);
1837 svc->conntrack_afmask &= ~afmask;
1838 }
1839#endif
1840}
1841
1842int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1843void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1844
1845static inline int
1846ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1847{
1848 /* We think the overhead of processing active connections is 256
1849 * times higher than that of inactive connections in average. (This
1850 * 256 times might not be accurate, we will change it later) We
1851 * use the following formula to estimate the overhead now:
1852 * dest->activeconns*256 + dest->inactconns
1853 */
1854 return (atomic_read(&dest->activeconns) << 8) +
1855 atomic_read(&dest->inactconns);
1856}
1857
1858#ifdef CONFIG_IP_VS_PROTO_TCP
1859INDIRECT_CALLABLE_DECLARE(int
1860 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1861 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1862#endif
1863
1864#ifdef CONFIG_IP_VS_PROTO_UDP
1865INDIRECT_CALLABLE_DECLARE(int
1866 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1867 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1868#endif
1869#endif /* _NET_IP_VS_H */