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[cor.git] / include / net / ip_vs.h
blob83be2d93b4076278150b24b3cbc1994b5c6c8bc5
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6 #ifndef _NET_IP_VS_H
7 #define _NET_IP_VS_H
8
9 #include <linux/ip_vs.h> /* definitions shared with userland */
10
11 #include <asm/types.h> /* for __uXX types */
12
13 #include <linux/list.h> /* for struct list_head */
14 #include <linux/spinlock.h> /* for struct rwlock_t */
15 #include <linux/atomic.h> /* for struct atomic_t */
16 #include <linux/refcount.h> /* for struct refcount_t */
17
18 #include <linux/compiler.h>
19 #include <linux/timer.h>
20 #include <linux/bug.h>
21
22 #include <net/checksum.h>
23 #include <linux/netfilter.h> /* for union nf_inet_addr */
24 #include <linux/ip.h>
25 #include <linux/ipv6.h> /* for struct ipv6hdr */
26 #include <net/ipv6.h>
27 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
28 #include <linux/netfilter_ipv6/ip6_tables.h>
29 #endif
30 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
31 #include <net/netfilter/nf_conntrack.h>
32 #endif
33 #include <net/net_namespace.h> /* Netw namespace */
34
35 #define IP_VS_HDR_INVERSE 1
36 #define IP_VS_HDR_ICMP 2
37
38 /* Generic access of ipvs struct */
39 static inline struct netns_ipvs *net_ipvs(struct net* net)
40 {
41 return net->ipvs;
42 }
43
44 /* Connections' size value needed by ip_vs_ctl.c */
45 extern int ip_vs_conn_tab_size;
46
47 struct ip_vs_iphdr {
48 int hdr_flags; /* ipvs flags */
49 __u32 off; /* Where IP or IPv4 header starts */
50 __u32 len; /* IPv4 simply where L4 starts
51 * IPv6 where L4 Transport Header starts */
52 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
53 __s16 protocol;
54 __s32 flags;
55 union nf_inet_addr saddr;
56 union nf_inet_addr daddr;
57 };
58
59 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
60 int len, void *buffer)
61 {
62 return skb_header_pointer(skb, offset, len, buffer);
63 }
64
65 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
66 * IPv6 requires some extra work, as finding proper header position,
67 * depend on the IPv6 extension headers.
68 */
69 static inline int
70 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
71 int hdr_flags, struct ip_vs_iphdr *iphdr)
72 {
73 iphdr->hdr_flags = hdr_flags;
74 iphdr->off = offset;
75
76 #ifdef CONFIG_IP_VS_IPV6
77 if (af == AF_INET6) {
78 struct ipv6hdr _iph;
79 const struct ipv6hdr *iph = skb_header_pointer(
80 skb, offset, sizeof(_iph), &_iph);
81 if (!iph)
82 return 0;
83
84 iphdr->saddr.in6 = iph->saddr;
85 iphdr->daddr.in6 = iph->daddr;
86 /* ipv6_find_hdr() updates len, flags */
87 iphdr->len = offset;
88 iphdr->flags = 0;
89 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
90 &iphdr->fragoffs,
91 &iphdr->flags);
92 if (iphdr->protocol < 0)
93 return 0;
94 } else
95 #endif
96 {
97 struct iphdr _iph;
98 const struct iphdr *iph = skb_header_pointer(
99 skb, offset, sizeof(_iph), &_iph);
100 if (!iph)
101 return 0;
102
103 iphdr->len = offset + iph->ihl * 4;
104 iphdr->fragoffs = 0;
105 iphdr->protocol = iph->protocol;
106 iphdr->saddr.ip = iph->saddr;
107 iphdr->daddr.ip = iph->daddr;
108 }
109
110 return 1;
111 }
112
113 static inline int
114 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
115 bool inverse, struct ip_vs_iphdr *iphdr)
116 {
117 int hdr_flags = IP_VS_HDR_ICMP;
118
119 if (inverse)
120 hdr_flags |= IP_VS_HDR_INVERSE;
121
122 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
123 }
124
125 static inline int
126 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
127 struct ip_vs_iphdr *iphdr)
128 {
129 int hdr_flags = 0;
130
131 if (inverse)
132 hdr_flags |= IP_VS_HDR_INVERSE;
133
134 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
135 hdr_flags, iphdr);
136 }
137
138 static inline bool
139 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
140 {
141 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
142 }
143
144 static inline bool
145 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
146 {
147 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
148 }
149
150 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
151 const union nf_inet_addr *src)
152 {
153 #ifdef CONFIG_IP_VS_IPV6
154 if (af == AF_INET6)
155 dst->in6 = src->in6;
156 else
157 #endif
158 dst->ip = src->ip;
159 }
160
161 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
162 const union nf_inet_addr *src)
163 {
164 #ifdef CONFIG_IP_VS_IPV6
165 if (af == AF_INET6) {
166 dst->in6 = src->in6;
167 return;
168 }
169 #endif
170 dst->ip = src->ip;
171 dst->all[1] = 0;
172 dst->all[2] = 0;
173 dst->all[3] = 0;
174 }
175
176 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
177 const union nf_inet_addr *b)
178 {
179 #ifdef CONFIG_IP_VS_IPV6
180 if (af == AF_INET6)
181 return ipv6_addr_equal(&a->in6, &b->in6);
182 #endif
183 return a->ip == b->ip;
184 }
185
186 #ifdef CONFIG_IP_VS_DEBUG
187 #include <linux/net.h>
188
189 int ip_vs_get_debug_level(void);
190
191 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
192 const union nf_inet_addr *addr,
193 int *idx)
194 {
195 int len;
196 #ifdef CONFIG_IP_VS_IPV6
197 if (af == AF_INET6)
198 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
199 &addr->in6) + 1;
200 else
201 #endif
202 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
203 &addr->ip) + 1;
204
205 *idx += len;
206 BUG_ON(*idx > buf_len + 1);
207 return &buf[*idx - len];
208 }
209
210 #define IP_VS_DBG_BUF(level, msg, ...) \
211 do { \
212 char ip_vs_dbg_buf[160]; \
213 int ip_vs_dbg_idx = 0; \
214 if (level <= ip_vs_get_debug_level()) \
215 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
216 } while (0)
217 #define IP_VS_ERR_BUF(msg...) \
218 do { \
219 char ip_vs_dbg_buf[160]; \
220 int ip_vs_dbg_idx = 0; \
221 pr_err(msg); \
222 } while (0)
223
224 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
225 #define IP_VS_DBG_ADDR(af, addr) \
226 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
227 sizeof(ip_vs_dbg_buf), addr, \
228 &ip_vs_dbg_idx)
229
230 #define IP_VS_DBG(level, msg, ...) \
231 do { \
232 if (level <= ip_vs_get_debug_level()) \
233 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
234 } while (0)
235 #define IP_VS_DBG_RL(msg, ...) \
236 do { \
237 if (net_ratelimit()) \
238 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
239 } while (0)
240 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
241 do { \
242 if (level <= ip_vs_get_debug_level()) \
243 pp->debug_packet(af, pp, skb, ofs, msg); \
244 } while (0)
245 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
246 do { \
247 if (level <= ip_vs_get_debug_level() && \
248 net_ratelimit()) \
249 pp->debug_packet(af, pp, skb, ofs, msg); \
250 } while (0)
251 #else /* NO DEBUGGING at ALL */
252 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
253 #define IP_VS_ERR_BUF(msg...) do {} while (0)
254 #define IP_VS_DBG(level, msg...) do {} while (0)
255 #define IP_VS_DBG_RL(msg...) do {} while (0)
256 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
257 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
258 #endif
259
260 #define IP_VS_BUG() BUG()
261 #define IP_VS_ERR_RL(msg, ...) \
262 do { \
263 if (net_ratelimit()) \
264 pr_err(msg, ##__VA_ARGS__); \
265 } while (0)
266
267 #ifdef CONFIG_IP_VS_DEBUG
268 #define EnterFunction(level) \
269 do { \
270 if (level <= ip_vs_get_debug_level()) \
271 printk(KERN_DEBUG \
272 pr_fmt("Enter: %s, %s line %i\n"), \
273 __func__, __FILE__, __LINE__); \
274 } while (0)
275 #define LeaveFunction(level) \
276 do { \
277 if (level <= ip_vs_get_debug_level()) \
278 printk(KERN_DEBUG \
279 pr_fmt("Leave: %s, %s line %i\n"), \
280 __func__, __FILE__, __LINE__); \
281 } while (0)
282 #else
283 #define EnterFunction(level) do {} while (0)
284 #define LeaveFunction(level) do {} while (0)
285 #endif
286
287 /* The port number of FTP service (in network order). */
288 #define FTPPORT cpu_to_be16(21)
289 #define FTPDATA cpu_to_be16(20)
290
291 /* TCP State Values */
292 enum {
293 IP_VS_TCP_S_NONE = 0,
294 IP_VS_TCP_S_ESTABLISHED,
295 IP_VS_TCP_S_SYN_SENT,
296 IP_VS_TCP_S_SYN_RECV,
297 IP_VS_TCP_S_FIN_WAIT,
298 IP_VS_TCP_S_TIME_WAIT,
299 IP_VS_TCP_S_CLOSE,
300 IP_VS_TCP_S_CLOSE_WAIT,
301 IP_VS_TCP_S_LAST_ACK,
302 IP_VS_TCP_S_LISTEN,
303 IP_VS_TCP_S_SYNACK,
304 IP_VS_TCP_S_LAST
305 };
306
307 /* UDP State Values */
308 enum {
309 IP_VS_UDP_S_NORMAL,
310 IP_VS_UDP_S_LAST,
311 };
312
313 /* ICMP State Values */
314 enum {
315 IP_VS_ICMP_S_NORMAL,
316 IP_VS_ICMP_S_LAST,
317 };
318
319 /* SCTP State Values */
320 enum ip_vs_sctp_states {
321 IP_VS_SCTP_S_NONE,
322 IP_VS_SCTP_S_INIT1,
323 IP_VS_SCTP_S_INIT,
324 IP_VS_SCTP_S_COOKIE_SENT,
325 IP_VS_SCTP_S_COOKIE_REPLIED,
326 IP_VS_SCTP_S_COOKIE_WAIT,
327 IP_VS_SCTP_S_COOKIE,
328 IP_VS_SCTP_S_COOKIE_ECHOED,
329 IP_VS_SCTP_S_ESTABLISHED,
330 IP_VS_SCTP_S_SHUTDOWN_SENT,
331 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
332 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
333 IP_VS_SCTP_S_REJECTED,
334 IP_VS_SCTP_S_CLOSED,
335 IP_VS_SCTP_S_LAST
336 };
337
338 /* Connection templates use bits from state */
339 #define IP_VS_CTPL_S_NONE 0x0000
340 #define IP_VS_CTPL_S_ASSURED 0x0001
341 #define IP_VS_CTPL_S_LAST 0x0002
342
343 /* Delta sequence info structure
344 * Each ip_vs_conn has 2 (output AND input seq. changes).
345 * Only used in the VS/NAT.
346 */
347 struct ip_vs_seq {
348 __u32 init_seq; /* Add delta from this seq */
349 __u32 delta; /* Delta in sequence numbers */
350 __u32 previous_delta; /* Delta in sequence numbers
351 * before last resized pkt */
352 };
353
354 /* counters per cpu */
355 struct ip_vs_counters {
356 __u64 conns; /* connections scheduled */
357 __u64 inpkts; /* incoming packets */
358 __u64 outpkts; /* outgoing packets */
359 __u64 inbytes; /* incoming bytes */
360 __u64 outbytes; /* outgoing bytes */
361 };
362 /* Stats per cpu */
363 struct ip_vs_cpu_stats {
364 struct ip_vs_counters cnt;
365 struct u64_stats_sync syncp;
366 };
367
368 /* IPVS statistics objects */
369 struct ip_vs_estimator {
370 struct list_head list;
371
372 u64 last_inbytes;
373 u64 last_outbytes;
374 u64 last_conns;
375 u64 last_inpkts;
376 u64 last_outpkts;
377
378 u64 cps;
379 u64 inpps;
380 u64 outpps;
381 u64 inbps;
382 u64 outbps;
383 };
384
385 /*
386 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
387 */
388 struct ip_vs_kstats {
389 u64 conns; /* connections scheduled */
390 u64 inpkts; /* incoming packets */
391 u64 outpkts; /* outgoing packets */
392 u64 inbytes; /* incoming bytes */
393 u64 outbytes; /* outgoing bytes */
394
395 u64 cps; /* current connection rate */
396 u64 inpps; /* current in packet rate */
397 u64 outpps; /* current out packet rate */
398 u64 inbps; /* current in byte rate */
399 u64 outbps; /* current out byte rate */
400 };
401
402 struct ip_vs_stats {
403 struct ip_vs_kstats kstats; /* kernel statistics */
404 struct ip_vs_estimator est; /* estimator */
405 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
406 spinlock_t lock; /* spin lock */
407 struct ip_vs_kstats kstats0; /* reset values */
408 };
409
410 struct dst_entry;
411 struct iphdr;
412 struct ip_vs_conn;
413 struct ip_vs_app;
414 struct sk_buff;
415 struct ip_vs_proto_data;
416
417 struct ip_vs_protocol {
418 struct ip_vs_protocol *next;
419 char *name;
420 u16 protocol;
421 u16 num_states;
422 int dont_defrag;
423
424 void (*init)(struct ip_vs_protocol *pp);
425
426 void (*exit)(struct ip_vs_protocol *pp);
427
428 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
429
430 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
431
432 int (*conn_schedule)(struct netns_ipvs *ipvs,
433 int af, struct sk_buff *skb,
434 struct ip_vs_proto_data *pd,
435 int *verdict, struct ip_vs_conn **cpp,
436 struct ip_vs_iphdr *iph);
437
438 struct ip_vs_conn *
439 (*conn_in_get)(struct netns_ipvs *ipvs,
440 int af,
441 const struct sk_buff *skb,
442 const struct ip_vs_iphdr *iph);
443
444 struct ip_vs_conn *
445 (*conn_out_get)(struct netns_ipvs *ipvs,
446 int af,
447 const struct sk_buff *skb,
448 const struct ip_vs_iphdr *iph);
449
450 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
451 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
452
453 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
454 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
455
456 const char *(*state_name)(int state);
457
458 void (*state_transition)(struct ip_vs_conn *cp, int direction,
459 const struct sk_buff *skb,
460 struct ip_vs_proto_data *pd);
461
462 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
463
464 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
465
466 int (*app_conn_bind)(struct ip_vs_conn *cp);
467
468 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
469 const struct sk_buff *skb,
470 int offset,
471 const char *msg);
472
473 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
474 };
475
476 /* protocol data per netns */
477 struct ip_vs_proto_data {
478 struct ip_vs_proto_data *next;
479 struct ip_vs_protocol *pp;
480 int *timeout_table; /* protocol timeout table */
481 atomic_t appcnt; /* counter of proto app incs. */
482 struct tcp_states_t *tcp_state_table;
483 };
484
485 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
486 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
487 unsigned short proto);
488
489 struct ip_vs_conn_param {
490 struct netns_ipvs *ipvs;
491 const union nf_inet_addr *caddr;
492 const union nf_inet_addr *vaddr;
493 __be16 cport;
494 __be16 vport;
495 __u16 protocol;
496 u16 af;
497
498 const struct ip_vs_pe *pe;
499 char *pe_data;
500 __u8 pe_data_len;
501 };
502
503 /* IP_VS structure allocated for each dynamically scheduled connection */
504 struct ip_vs_conn {
505 struct hlist_node c_list; /* hashed list heads */
506 /* Protocol, addresses and port numbers */
507 __be16 cport;
508 __be16 dport;
509 __be16 vport;
510 u16 af; /* address family */
511 union nf_inet_addr caddr; /* client address */
512 union nf_inet_addr vaddr; /* virtual address */
513 union nf_inet_addr daddr; /* destination address */
514 volatile __u32 flags; /* status flags */
515 __u16 protocol; /* Which protocol (TCP/UDP) */
516 __u16 daf; /* Address family of the dest */
517 struct netns_ipvs *ipvs;
518
519 /* counter and timer */
520 refcount_t refcnt; /* reference count */
521 struct timer_list timer; /* Expiration timer */
522 volatile unsigned long timeout; /* timeout */
523
524 /* Flags and state transition */
525 spinlock_t lock; /* lock for state transition */
526 volatile __u16 state; /* state info */
527 volatile __u16 old_state; /* old state, to be used for
528 * state transition triggerd
529 * synchronization
530 */
531 __u32 fwmark; /* Fire wall mark from skb */
532 unsigned long sync_endtime; /* jiffies + sent_retries */
533
534 /* Control members */
535 struct ip_vs_conn *control; /* Master control connection */
536 atomic_t n_control; /* Number of controlled ones */
537 struct ip_vs_dest *dest; /* real server */
538 atomic_t in_pkts; /* incoming packet counter */
539
540 /* Packet transmitter for different forwarding methods. If it
541 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
542 * otherwise this must be changed to a sk_buff **.
543 * NF_ACCEPT can be returned when destination is local.
544 */
545 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
546 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
547
548 /* Note: we can group the following members into a structure,
549 * in order to save more space, and the following members are
550 * only used in VS/NAT anyway
551 */
552 struct ip_vs_app *app; /* bound ip_vs_app object */
553 void *app_data; /* Application private data */
554 struct ip_vs_seq in_seq; /* incoming seq. struct */
555 struct ip_vs_seq out_seq; /* outgoing seq. struct */
556
557 const struct ip_vs_pe *pe;
558 char *pe_data;
559 __u8 pe_data_len;
560
561 struct rcu_head rcu_head;
562 };
563
564 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
565 * for IPv6 support.
566 *
567 * We need these to conveniently pass around service and destination
568 * options, but unfortunately, we also need to keep the old definitions to
569 * maintain userspace backwards compatibility for the setsockopt interface.
570 */
571 struct ip_vs_service_user_kern {
572 /* virtual service addresses */
573 u16 af;
574 u16 protocol;
575 union nf_inet_addr addr; /* virtual ip address */
576 __be16 port;
577 u32 fwmark; /* firwall mark of service */
578
579 /* virtual service options */
580 char *sched_name;
581 char *pe_name;
582 unsigned int flags; /* virtual service flags */
583 unsigned int timeout; /* persistent timeout in sec */
584 __be32 netmask; /* persistent netmask or plen */
585 };
586
587
588 struct ip_vs_dest_user_kern {
589 /* destination server address */
590 union nf_inet_addr addr;
591 __be16 port;
592
593 /* real server options */
594 unsigned int conn_flags; /* connection flags */
595 int weight; /* destination weight */
596
597 /* thresholds for active connections */
598 u32 u_threshold; /* upper threshold */
599 u32 l_threshold; /* lower threshold */
600
601 /* Address family of addr */
602 u16 af;
603
604 u16 tun_type; /* tunnel type */
605 __be16 tun_port; /* tunnel port */
606 u16 tun_flags; /* tunnel flags */
607 };
608
609
610 /*
611 * The information about the virtual service offered to the net and the
612 * forwarding entries.
613 */
614 struct ip_vs_service {
615 struct hlist_node s_list; /* for normal service table */
616 struct hlist_node f_list; /* for fwmark-based service table */
617 atomic_t refcnt; /* reference counter */
618
619 u16 af; /* address family */
620 __u16 protocol; /* which protocol (TCP/UDP) */
621 union nf_inet_addr addr; /* IP address for virtual service */
622 __be16 port; /* port number for the service */
623 __u32 fwmark; /* firewall mark of the service */
624 unsigned int flags; /* service status flags */
625 unsigned int timeout; /* persistent timeout in ticks */
626 __be32 netmask; /* grouping granularity, mask/plen */
627 struct netns_ipvs *ipvs;
628
629 struct list_head destinations; /* real server d-linked list */
630 __u32 num_dests; /* number of servers */
631 struct ip_vs_stats stats; /* statistics for the service */
632
633 /* for scheduling */
634 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
635 spinlock_t sched_lock; /* lock sched_data */
636 void *sched_data; /* scheduler application data */
637
638 /* alternate persistence engine */
639 struct ip_vs_pe __rcu *pe;
640 int conntrack_afmask;
641
642 struct rcu_head rcu_head;
643 };
644
645 /* Information for cached dst */
646 struct ip_vs_dest_dst {
647 struct dst_entry *dst_cache; /* destination cache entry */
648 u32 dst_cookie;
649 union nf_inet_addr dst_saddr;
650 struct rcu_head rcu_head;
651 };
652
653 /* The real server destination forwarding entry with ip address, port number,
654 * and so on.
655 */
656 struct ip_vs_dest {
657 struct list_head n_list; /* for the dests in the service */
658 struct hlist_node d_list; /* for table with all the dests */
659
660 u16 af; /* address family */
661 __be16 port; /* port number of the server */
662 union nf_inet_addr addr; /* IP address of the server */
663 volatile unsigned int flags; /* dest status flags */
664 atomic_t conn_flags; /* flags to copy to conn */
665 atomic_t weight; /* server weight */
666 atomic_t last_weight; /* server latest weight */
667 __u16 tun_type; /* tunnel type */
668 __be16 tun_port; /* tunnel port */
669 __u16 tun_flags; /* tunnel flags */
670
671 refcount_t refcnt; /* reference counter */
672 struct ip_vs_stats stats; /* statistics */
673 unsigned long idle_start; /* start time, jiffies */
674
675 /* connection counters and thresholds */
676 atomic_t activeconns; /* active connections */
677 atomic_t inactconns; /* inactive connections */
678 atomic_t persistconns; /* persistent connections */
679 __u32 u_threshold; /* upper threshold */
680 __u32 l_threshold; /* lower threshold */
681
682 /* for destination cache */
683 spinlock_t dst_lock; /* lock of dst_cache */
684 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
685
686 /* for virtual service */
687 struct ip_vs_service __rcu *svc; /* service it belongs to */
688 __u16 protocol; /* which protocol (TCP/UDP) */
689 __be16 vport; /* virtual port number */
690 union nf_inet_addr vaddr; /* virtual IP address */
691 __u32 vfwmark; /* firewall mark of service */
692
693 struct list_head t_list; /* in dest_trash */
694 unsigned int in_rs_table:1; /* we are in rs_table */
695 };
696
697 /* The scheduler object */
698 struct ip_vs_scheduler {
699 struct list_head n_list; /* d-linked list head */
700 char *name; /* scheduler name */
701 atomic_t refcnt; /* reference counter */
702 struct module *module; /* THIS_MODULE/NULL */
703
704 /* scheduler initializing service */
705 int (*init_service)(struct ip_vs_service *svc);
706 /* scheduling service finish */
707 void (*done_service)(struct ip_vs_service *svc);
708 /* dest is linked */
709 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is unlinked */
711 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712 /* dest is updated */
713 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
714
715 /* selecting a server from the given service */
716 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
717 const struct sk_buff *skb,
718 struct ip_vs_iphdr *iph);
719 };
720
721 /* The persistence engine object */
722 struct ip_vs_pe {
723 struct list_head n_list; /* d-linked list head */
724 char *name; /* scheduler name */
725 atomic_t refcnt; /* reference counter */
726 struct module *module; /* THIS_MODULE/NULL */
727
728 /* get the connection template, if any */
729 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
730 bool (*ct_match)(const struct ip_vs_conn_param *p,
731 struct ip_vs_conn *ct);
732 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
733 bool inverse);
734 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
735 /* create connections for real-server outgoing packets */
736 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
737 struct ip_vs_dest *dest,
738 struct sk_buff *skb,
739 const struct ip_vs_iphdr *iph,
740 __be16 dport, __be16 cport);
741 };
742
743 /* The application module object (a.k.a. app incarnation) */
744 struct ip_vs_app {
745 struct list_head a_list; /* member in app list */
746 int type; /* IP_VS_APP_TYPE_xxx */
747 char *name; /* application module name */
748 __u16 protocol;
749 struct module *module; /* THIS_MODULE/NULL */
750 struct list_head incs_list; /* list of incarnations */
751
752 /* members for application incarnations */
753 struct list_head p_list; /* member in proto app list */
754 struct ip_vs_app *app; /* its real application */
755 __be16 port; /* port number in net order */
756 atomic_t usecnt; /* usage counter */
757 struct rcu_head rcu_head;
758
759 /* output hook: Process packet in inout direction, diff set for TCP.
760 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
761 * 2=Mangled but checksum was not updated
762 */
763 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
764 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
765
766 /* input hook: Process packet in outin direction, diff set for TCP.
767 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
768 * 2=Mangled but checksum was not updated
769 */
770 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
771 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
772
773 /* ip_vs_app initializer */
774 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
775
776 /* ip_vs_app finish */
777 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
778
779
780 /* not used now */
781 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
782 struct ip_vs_protocol *);
783
784 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
785
786 int * timeout_table;
787 int * timeouts;
788 int timeouts_size;
789
790 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
791 int *verdict, struct ip_vs_conn **cpp);
792
793 struct ip_vs_conn *
794 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
795 const struct iphdr *iph, int inverse);
796
797 struct ip_vs_conn *
798 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
799 const struct iphdr *iph, int inverse);
800
801 int (*state_transition)(struct ip_vs_conn *cp, int direction,
802 const struct sk_buff *skb,
803 struct ip_vs_app *app);
804
805 void (*timeout_change)(struct ip_vs_app *app, int flags);
806 };
807
808 struct ipvs_master_sync_state {
809 struct list_head sync_queue;
810 struct ip_vs_sync_buff *sync_buff;
811 unsigned long sync_queue_len;
812 unsigned int sync_queue_delay;
813 struct delayed_work master_wakeup_work;
814 struct netns_ipvs *ipvs;
815 };
816
817 struct ip_vs_sync_thread_data;
818
819 /* How much time to keep dests in trash */
820 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
821
822 struct ipvs_sync_daemon_cfg {
823 union nf_inet_addr mcast_group;
824 int syncid;
825 u16 sync_maxlen;
826 u16 mcast_port;
827 u8 mcast_af;
828 u8 mcast_ttl;
829 /* multicast interface name */
830 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
831 };
832
833 /* IPVS in network namespace */
834 struct netns_ipvs {
835 int gen; /* Generation */
836 int enable; /* enable like nf_hooks do */
837 /* Hash table: for real service lookups */
838 #define IP_VS_RTAB_BITS 4
839 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
840 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
841
842 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
843 /* ip_vs_app */
844 struct list_head app_list;
845 /* ip_vs_proto */
846 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
847 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
848 /* ip_vs_proto_tcp */
849 #ifdef CONFIG_IP_VS_PROTO_TCP
850 #define TCP_APP_TAB_BITS 4
851 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
852 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
853 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
854 #endif
855 /* ip_vs_proto_udp */
856 #ifdef CONFIG_IP_VS_PROTO_UDP
857 #define UDP_APP_TAB_BITS 4
858 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
859 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
860 struct list_head udp_apps[UDP_APP_TAB_SIZE];
861 #endif
862 /* ip_vs_proto_sctp */
863 #ifdef CONFIG_IP_VS_PROTO_SCTP
864 #define SCTP_APP_TAB_BITS 4
865 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
866 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
867 /* Hash table for SCTP application incarnations */
868 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
869 #endif
870 /* ip_vs_conn */
871 atomic_t conn_count; /* connection counter */
872
873 /* ip_vs_ctl */
874 struct ip_vs_stats tot_stats; /* Statistics & est. */
875
876 int num_services; /* no of virtual services */
877
878 /* Trash for destinations */
879 struct list_head dest_trash;
880 spinlock_t dest_trash_lock;
881 struct timer_list dest_trash_timer; /* expiration timer */
882 /* Service counters */
883 atomic_t ftpsvc_counter;
884 atomic_t nullsvc_counter;
885 atomic_t conn_out_counter;
886
887 #ifdef CONFIG_SYSCTL
888 /* 1/rate drop and drop-entry variables */
889 struct delayed_work defense_work; /* Work handler */
890 int drop_rate;
891 int drop_counter;
892 int old_secure_tcp;
893 atomic_t dropentry;
894 /* locks in ctl.c */
895 spinlock_t dropentry_lock; /* drop entry handling */
896 spinlock_t droppacket_lock; /* drop packet handling */
897 spinlock_t securetcp_lock; /* state and timeout tables */
898
899 /* sys-ctl struct */
900 struct ctl_table_header *sysctl_hdr;
901 struct ctl_table *sysctl_tbl;
902 #endif
903
904 /* sysctl variables */
905 int sysctl_amemthresh;
906 int sysctl_am_droprate;
907 int sysctl_drop_entry;
908 int sysctl_drop_packet;
909 int sysctl_secure_tcp;
910 #ifdef CONFIG_IP_VS_NFCT
911 int sysctl_conntrack;
912 #endif
913 int sysctl_snat_reroute;
914 int sysctl_sync_ver;
915 int sysctl_sync_ports;
916 int sysctl_sync_persist_mode;
917 unsigned long sysctl_sync_qlen_max;
918 int sysctl_sync_sock_size;
919 int sysctl_cache_bypass;
920 int sysctl_expire_nodest_conn;
921 int sysctl_sloppy_tcp;
922 int sysctl_sloppy_sctp;
923 int sysctl_expire_quiescent_template;
924 int sysctl_sync_threshold[2];
925 unsigned int sysctl_sync_refresh_period;
926 int sysctl_sync_retries;
927 int sysctl_nat_icmp_send;
928 int sysctl_pmtu_disc;
929 int sysctl_backup_only;
930 int sysctl_conn_reuse_mode;
931 int sysctl_schedule_icmp;
932 int sysctl_ignore_tunneled;
933
934 /* ip_vs_lblc */
935 int sysctl_lblc_expiration;
936 struct ctl_table_header *lblc_ctl_header;
937 struct ctl_table *lblc_ctl_table;
938 /* ip_vs_lblcr */
939 int sysctl_lblcr_expiration;
940 struct ctl_table_header *lblcr_ctl_header;
941 struct ctl_table *lblcr_ctl_table;
942 /* ip_vs_est */
943 struct list_head est_list; /* estimator list */
944 spinlock_t est_lock;
945 struct timer_list est_timer; /* Estimation timer */
946 /* ip_vs_sync */
947 spinlock_t sync_lock;
948 struct ipvs_master_sync_state *ms;
949 spinlock_t sync_buff_lock;
950 struct ip_vs_sync_thread_data *master_tinfo;
951 struct ip_vs_sync_thread_data *backup_tinfo;
952 int threads_mask;
953 volatile int sync_state;
954 struct mutex sync_mutex;
955 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
956 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
957 /* net name space ptr */
958 struct net *net; /* Needed by timer routines */
959 /* Number of heterogeneous destinations, needed becaus heterogeneous
960 * are not supported when synchronization is enabled.
961 */
962 unsigned int mixed_address_family_dests;
963 };
964
965 #define DEFAULT_SYNC_THRESHOLD 3
966 #define DEFAULT_SYNC_PERIOD 50
967 #define DEFAULT_SYNC_VER 1
968 #define DEFAULT_SLOPPY_TCP 0
969 #define DEFAULT_SLOPPY_SCTP 0
970 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
971 #define DEFAULT_SYNC_RETRIES 0
972 #define IPVS_SYNC_WAKEUP_RATE 8
973 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
974 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
975 #define IPVS_SYNC_CHECK_PERIOD HZ
976 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
977 #define IPVS_SYNC_PORTS_MAX (1 << 6)
978
979 #ifdef CONFIG_SYSCTL
980
981 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
982 {
983 return ipvs->sysctl_sync_threshold[0];
984 }
985
986 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
987 {
988 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
989 }
990
991 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
992 {
993 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
994 }
995
996 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
997 {
998 return ipvs->sysctl_sync_retries;
999 }
1000
1001 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1002 {
1003 return ipvs->sysctl_sync_ver;
1004 }
1005
1006 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1007 {
1008 return ipvs->sysctl_sloppy_tcp;
1009 }
1010
1011 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1012 {
1013 return ipvs->sysctl_sloppy_sctp;
1014 }
1015
1016 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1017 {
1018 return READ_ONCE(ipvs->sysctl_sync_ports);
1019 }
1020
1021 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1022 {
1023 return ipvs->sysctl_sync_persist_mode;
1024 }
1025
1026 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1027 {
1028 return ipvs->sysctl_sync_qlen_max;
1029 }
1030
1031 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1032 {
1033 return ipvs->sysctl_sync_sock_size;
1034 }
1035
1036 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1037 {
1038 return ipvs->sysctl_pmtu_disc;
1039 }
1040
1041 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1042 {
1043 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1044 ipvs->sysctl_backup_only;
1045 }
1046
1047 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1048 {
1049 return ipvs->sysctl_conn_reuse_mode;
1050 }
1051
1052 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1053 {
1054 return ipvs->sysctl_schedule_icmp;
1055 }
1056
1057 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1058 {
1059 return ipvs->sysctl_ignore_tunneled;
1060 }
1061
1062 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1063 {
1064 return ipvs->sysctl_cache_bypass;
1065 }
1066
1067 #else
1068
1069 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1070 {
1071 return DEFAULT_SYNC_THRESHOLD;
1072 }
1073
1074 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1075 {
1076 return DEFAULT_SYNC_PERIOD;
1077 }
1078
1079 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1080 {
1081 return DEFAULT_SYNC_REFRESH_PERIOD;
1082 }
1083
1084 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1085 {
1086 return DEFAULT_SYNC_RETRIES & 3;
1087 }
1088
1089 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1090 {
1091 return DEFAULT_SYNC_VER;
1092 }
1093
1094 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1095 {
1096 return DEFAULT_SLOPPY_TCP;
1097 }
1098
1099 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1100 {
1101 return DEFAULT_SLOPPY_SCTP;
1102 }
1103
1104 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1105 {
1106 return 1;
1107 }
1108
1109 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1110 {
1111 return 0;
1112 }
1113
1114 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1115 {
1116 return IPVS_SYNC_QLEN_MAX;
1117 }
1118
1119 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1120 {
1121 return 0;
1122 }
1123
1124 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1125 {
1126 return 1;
1127 }
1128
1129 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1130 {
1131 return 0;
1132 }
1133
1134 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1135 {
1136 return 1;
1137 }
1138
1139 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1140 {
1141 return 0;
1142 }
1143
1144 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1145 {
1146 return 0;
1147 }
1148
1149 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1150 {
1151 return 0;
1152 }
1153
1154 #endif
1155
1156 /* IPVS core functions
1157 * (from ip_vs_core.c)
1158 */
1159 const char *ip_vs_proto_name(unsigned int proto);
1160 void ip_vs_init_hash_table(struct list_head *table, int rows);
1161 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1162 struct ip_vs_dest *dest,
1163 struct sk_buff *skb,
1164 const struct ip_vs_iphdr *iph,
1165 __be16 dport,
1166 __be16 cport);
1167 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1168
1169 #define IP_VS_APP_TYPE_FTP 1
1170
1171 /* ip_vs_conn handling functions
1172 * (from ip_vs_conn.c)
1173 */
1174 enum {
1175 IP_VS_DIR_INPUT = 0,
1176 IP_VS_DIR_OUTPUT,
1177 IP_VS_DIR_INPUT_ONLY,
1178 IP_VS_DIR_LAST,
1179 };
1180
1181 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1182 const union nf_inet_addr *caddr,
1183 __be16 cport,
1184 const union nf_inet_addr *vaddr,
1185 __be16 vport,
1186 struct ip_vs_conn_param *p)
1187 {
1188 p->ipvs = ipvs;
1189 p->af = af;
1190 p->protocol = protocol;
1191 p->caddr = caddr;
1192 p->cport = cport;
1193 p->vaddr = vaddr;
1194 p->vport = vport;
1195 p->pe = NULL;
1196 p->pe_data = NULL;
1197 }
1198
1199 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1200 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1201
1202 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1203 const struct sk_buff *skb,
1204 const struct ip_vs_iphdr *iph);
1205
1206 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1207
1208 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1209 const struct sk_buff *skb,
1210 const struct ip_vs_iphdr *iph);
1211
1212 /* Get reference to gain full access to conn.
1213 * By default, RCU read-side critical sections have access only to
1214 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1215 */
1216 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1217 {
1218 return refcount_inc_not_zero(&cp->refcnt);
1219 }
1220
1221 /* put back the conn without restarting its timer */
1222 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1223 {
1224 smp_mb__before_atomic();
1225 refcount_dec(&cp->refcnt);
1226 }
1227 void ip_vs_conn_put(struct ip_vs_conn *cp);
1228 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1229
1230 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1231 const union nf_inet_addr *daddr,
1232 __be16 dport, unsigned int flags,
1233 struct ip_vs_dest *dest, __u32 fwmark);
1234 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1235
1236 const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1237
1238 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1239 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1240 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1241 int ip_vs_conn_init(void);
1242 void ip_vs_conn_cleanup(void);
1243
1244 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1245 {
1246 struct ip_vs_conn *ctl_cp = cp->control;
1247 if (!ctl_cp) {
1248 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1249 "%s:%d to %s:%d\n",
1250 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1251 ntohs(cp->cport),
1252 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1253 ntohs(cp->vport));
1254
1255 return;
1256 }
1257
1258 IP_VS_DBG_BUF(7, "DELeting control for: "
1259 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1260 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1261 ntohs(cp->cport),
1262 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1263 ntohs(ctl_cp->cport));
1264
1265 cp->control = NULL;
1266 if (atomic_read(&ctl_cp->n_control) == 0) {
1267 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1268 "%s:%d to %s:%d\n",
1269 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1270 ntohs(cp->cport),
1271 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1272 ntohs(cp->vport));
1273
1274 return;
1275 }
1276 atomic_dec(&ctl_cp->n_control);
1277 }
1278
1279 static inline void
1280 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1281 {
1282 if (cp->control) {
1283 IP_VS_ERR_BUF("request control ADD for already controlled: "
1284 "%s:%d to %s:%d\n",
1285 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1286 ntohs(cp->cport),
1287 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1288 ntohs(cp->vport));
1289
1290 ip_vs_control_del(cp);
1291 }
1292
1293 IP_VS_DBG_BUF(7, "ADDing control for: "
1294 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1295 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1296 ntohs(cp->cport),
1297 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1298 ntohs(ctl_cp->cport));
1299
1300 cp->control = ctl_cp;
1301 atomic_inc(&ctl_cp->n_control);
1302 }
1303
1304 /* Mark our template as assured */
1305 static inline void
1306 ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1307 {
1308 struct ip_vs_conn *ct = cp->control;
1309
1310 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1311 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1312 ct->state |= IP_VS_CTPL_S_ASSURED;
1313 }
1314
1315 /* IPVS netns init & cleanup functions */
1316 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1317 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1318 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1319 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1320 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1321 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1322 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1323 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1324 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1325 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1326 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1327 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1328 void ip_vs_service_nets_cleanup(struct list_head *net_list);
1329
1330 /* IPVS application functions
1331 * (from ip_vs_app.c)
1332 */
1333 #define IP_VS_APP_MAX_PORTS 8
1334 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1335 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1336 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1337 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1338 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1339 __u16 port);
1340 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1341 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1342
1343 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1344 struct ip_vs_iphdr *ipvsh);
1345 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1346 struct ip_vs_iphdr *ipvsh);
1347
1348 int register_ip_vs_pe(struct ip_vs_pe *pe);
1349 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1350 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1351 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1352
1353 /* Use a #define to avoid all of module.h just for these trivial ops */
1354 #define ip_vs_pe_get(pe) \
1355 if (pe && pe->module) \
1356 __module_get(pe->module);
1357
1358 #define ip_vs_pe_put(pe) \
1359 if (pe && pe->module) \
1360 module_put(pe->module);
1361
1362 /* IPVS protocol functions (from ip_vs_proto.c) */
1363 int ip_vs_protocol_init(void);
1364 void ip_vs_protocol_cleanup(void);
1365 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1366 int *ip_vs_create_timeout_table(int *table, int size);
1367 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1368 const struct sk_buff *skb, int offset,
1369 const char *msg);
1370
1371 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1372 extern struct ip_vs_protocol ip_vs_protocol_udp;
1373 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1374 extern struct ip_vs_protocol ip_vs_protocol_esp;
1375 extern struct ip_vs_protocol ip_vs_protocol_ah;
1376 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1377
1378 /* Registering/unregistering scheduler functions
1379 * (from ip_vs_sched.c)
1380 */
1381 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1382 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1383 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1384 struct ip_vs_scheduler *scheduler);
1385 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1386 struct ip_vs_scheduler *sched);
1387 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1388 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1389 struct ip_vs_conn *
1390 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1391 struct ip_vs_proto_data *pd, int *ignored,
1392 struct ip_vs_iphdr *iph);
1393 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1394 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1395
1396 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1397
1398 /* IPVS control data and functions (from ip_vs_ctl.c) */
1399 extern struct ip_vs_stats ip_vs_stats;
1400 extern int sysctl_ip_vs_sync_ver;
1401
1402 struct ip_vs_service *
1403 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1404 const union nf_inet_addr *vaddr, __be16 vport);
1405
1406 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1407 const union nf_inet_addr *daddr, __be16 dport);
1408
1409 struct ip_vs_dest *
1410 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1411 const union nf_inet_addr *daddr, __be16 dport);
1412 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1413 const union nf_inet_addr *daddr,
1414 __be16 tun_port);
1415
1416 int ip_vs_use_count_inc(void);
1417 void ip_vs_use_count_dec(void);
1418 int ip_vs_register_nl_ioctl(void);
1419 void ip_vs_unregister_nl_ioctl(void);
1420 int ip_vs_control_init(void);
1421 void ip_vs_control_cleanup(void);
1422 struct ip_vs_dest *
1423 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1424 const union nf_inet_addr *daddr, __be16 dport,
1425 const union nf_inet_addr *vaddr, __be16 vport,
1426 __u16 protocol, __u32 fwmark, __u32 flags);
1427 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1428
1429 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1430 {
1431 refcount_inc(&dest->refcnt);
1432 }
1433
1434 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1435 {
1436 smp_mb__before_atomic();
1437 refcount_dec(&dest->refcnt);
1438 }
1439
1440 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1441 {
1442 if (refcount_dec_and_test(&dest->refcnt))
1443 kfree(dest);
1444 }
1445
1446 /* IPVS sync daemon data and function prototypes
1447 * (from ip_vs_sync.c)
1448 */
1449 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1450 int state);
1451 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1452 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1453
1454 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1455 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1456 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1457 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1458 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1459
1460 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1461 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1462 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1464 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1466 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1467 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1468 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1469 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1470 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1471 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1472 struct ip_vs_protocol *pp, int offset,
1473 unsigned int hooknum, struct ip_vs_iphdr *iph);
1474 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1475
1476 #ifdef CONFIG_IP_VS_IPV6
1477 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1478 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1485 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1486 struct ip_vs_protocol *pp, int offset,
1487 unsigned int hooknum, struct ip_vs_iphdr *iph);
1488 #endif
1489
1490 #ifdef CONFIG_SYSCTL
1491 /* This is a simple mechanism to ignore packets when
1492 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1493 * we start to drop 1/rate of the packets
1494 */
1495 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1496 {
1497 if (!ipvs->drop_rate)
1498 return 0;
1499 if (--ipvs->drop_counter > 0)
1500 return 0;
1501 ipvs->drop_counter = ipvs->drop_rate;
1502 return 1;
1503 }
1504 #else
1505 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1506 #endif
1507
1508 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1509 IP_VS_CONN_F_FWD_MASK)
1510
1511 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1512 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1513
1514 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1515 {
1516 char fwd;
1517
1518 switch (IP_VS_FWD_METHOD(cp)) {
1519 case IP_VS_CONN_F_MASQ:
1520 fwd = 'M'; break;
1521 case IP_VS_CONN_F_LOCALNODE:
1522 fwd = 'L'; break;
1523 case IP_VS_CONN_F_TUNNEL:
1524 fwd = 'T'; break;
1525 case IP_VS_CONN_F_DROUTE:
1526 fwd = 'R'; break;
1527 case IP_VS_CONN_F_BYPASS:
1528 fwd = 'B'; break;
1529 default:
1530 fwd = '?'; break;
1531 }
1532 return fwd;
1533 }
1534
1535 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1536 struct ip_vs_conn *cp, int dir);
1537
1538 #ifdef CONFIG_IP_VS_IPV6
1539 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1540 struct ip_vs_conn *cp, int dir);
1541 #endif
1542
1543 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1544
1545 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1546 {
1547 __be32 diff[2] = { ~old, new };
1548
1549 return csum_partial(diff, sizeof(diff), oldsum);
1550 }
1551
1552 #ifdef CONFIG_IP_VS_IPV6
1553 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1554 __wsum oldsum)
1555 {
1556 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1557 new[3], new[2], new[1], new[0] };
1558
1559 return csum_partial(diff, sizeof(diff), oldsum);
1560 }
1561 #endif
1562
1563 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1564 {
1565 __be16 diff[2] = { ~old, new };
1566
1567 return csum_partial(diff, sizeof(diff), oldsum);
1568 }
1569
1570 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1571 static inline void ip_vs_notrack(struct sk_buff *skb)
1572 {
1573 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1574 enum ip_conntrack_info ctinfo;
1575 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1576
1577 if (ct) {
1578 nf_conntrack_put(&ct->ct_general);
1579 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1580 }
1581 #endif
1582 }
1583
1584 #ifdef CONFIG_IP_VS_NFCT
1585 /* Netfilter connection tracking
1586 * (from ip_vs_nfct.c)
1587 */
1588 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1589 {
1590 #ifdef CONFIG_SYSCTL
1591 return ipvs->sysctl_conntrack;
1592 #else
1593 return 0;
1594 #endif
1595 }
1596
1597 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1598 int outin);
1599 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1600 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1601 struct ip_vs_conn *cp, u_int8_t proto,
1602 const __be16 port, int from_rs);
1603 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1604
1605 #else
1606
1607 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1608 {
1609 return 0;
1610 }
1611
1612 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1613 struct ip_vs_conn *cp, int outin)
1614 {
1615 }
1616
1617 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1618 {
1619 return NF_ACCEPT;
1620 }
1621
1622 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1623 {
1624 }
1625 #endif /* CONFIG_IP_VS_NFCT */
1626
1627 /* Really using conntrack? */
1628 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1629 struct sk_buff *skb)
1630 {
1631 #ifdef CONFIG_IP_VS_NFCT
1632 enum ip_conntrack_info ctinfo;
1633 struct nf_conn *ct;
1634
1635 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1636 return false;
1637 ct = nf_ct_get(skb, &ctinfo);
1638 if (ct)
1639 return true;
1640 #endif
1641 return false;
1642 }
1643
1644 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1645 {
1646 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1647 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1648 int ret = 0;
1649
1650 if (!(svc->conntrack_afmask & afmask)) {
1651 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1652 if (ret >= 0)
1653 svc->conntrack_afmask |= afmask;
1654 }
1655 return ret;
1656 #else
1657 return 0;
1658 #endif
1659 }
1660
1661 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1662 {
1663 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1664 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1665
1666 if (svc->conntrack_afmask & afmask) {
1667 nf_ct_netns_put(svc->ipvs->net, svc->af);
1668 svc->conntrack_afmask &= ~afmask;
1669 }
1670 #endif
1671 }
1672
1673 static inline int
1674 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1675 {
1676 /* We think the overhead of processing active connections is 256
1677 * times higher than that of inactive connections in average. (This
1678 * 256 times might not be accurate, we will change it later) We
1679 * use the following formula to estimate the overhead now:
1680 * dest->activeconns*256 + dest->inactconns
1681 */
1682 return (atomic_read(&dest->activeconns) << 8) +
1683 atomic_read(&dest->inactconns);
1684 }
1685
1686 #endif /* _NET_IP_VS_H */
connection oriented routing