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