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[mirror_ubuntu-bionic-kernel.git] / include / net / ip_vs.h
1 /* IP Virtual Server
2 * data structure and functionality definitions
3 */
4
5 #ifndef _NET_IP_VS_H
6 #define _NET_IP_VS_H
7
8 #include <linux/ip_vs.h> /* definitions shared with userland */
9
10 #include <asm/types.h> /* for __uXX types */
11
12 #include <linux/list.h> /* for struct list_head */
13 #include <linux/spinlock.h> /* for struct rwlock_t */
14 #include <linux/atomic.h> /* for struct atomic_t */
15 #include <linux/compiler.h>
16 #include <linux/timer.h>
17 #include <linux/bug.h>
18
19 #include <net/checksum.h>
20 #include <linux/netfilter.h> /* for union nf_inet_addr */
21 #include <linux/ip.h>
22 #include <linux/ipv6.h> /* for struct ipv6hdr */
23 #include <net/ipv6.h>
24 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
25 #include <linux/netfilter_ipv6/ip6_tables.h>
26 #endif
27 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
28 #include <net/netfilter/nf_conntrack.h>
29 #endif
30 #include <net/net_namespace.h> /* Netw namespace */
31
32 /* Generic access of ipvs struct */
33 static inline struct netns_ipvs *net_ipvs(struct net* net)
34 {
35 return net->ipvs;
36 }
37
38 /* Get net ptr from skb in traffic cases
39 * use skb_sknet when call is from userland (ioctl or netlink)
40 */
41 static inline struct net *skb_net(const struct sk_buff *skb)
42 {
43 #ifdef CONFIG_NET_NS
44 #ifdef CONFIG_IP_VS_DEBUG
45 /*
46 * This is used for debug only.
47 * Start with the most likely hit
48 * End with BUG
49 */
50 if (likely(skb->dev && dev_net(skb->dev)))
51 return dev_net(skb->dev);
52 if (skb_dst(skb) && skb_dst(skb)->dev)
53 return dev_net(skb_dst(skb)->dev);
54 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
55 __func__, __LINE__);
56 if (likely(skb->sk && sock_net(skb->sk)))
57 return sock_net(skb->sk);
58 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
59 __func__, __LINE__);
60 BUG();
61 #else
62 return dev_net(skb->dev ? : skb_dst(skb)->dev);
63 #endif
64 #else
65 return &init_net;
66 #endif
67 }
68
69 static inline struct net *skb_sknet(const struct sk_buff *skb)
70 {
71 #ifdef CONFIG_NET_NS
72 #ifdef CONFIG_IP_VS_DEBUG
73 /* Start with the most likely hit */
74 if (likely(skb->sk && sock_net(skb->sk)))
75 return sock_net(skb->sk);
76 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
77 __func__, __LINE__);
78 if (likely(skb->dev && dev_net(skb->dev)))
79 return dev_net(skb->dev);
80 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
81 __func__, __LINE__);
82 BUG();
83 #else
84 return sock_net(skb->sk);
85 #endif
86 #else
87 return &init_net;
88 #endif
89 }
90
91 /* This one needed for single_open_net since net is stored directly in
92 * private not as a struct i.e. seq_file_net can't be used.
93 */
94 static inline struct net *seq_file_single_net(struct seq_file *seq)
95 {
96 #ifdef CONFIG_NET_NS
97 return (struct net *)seq->private;
98 #else
99 return &init_net;
100 #endif
101 }
102
103 /* Connections' size value needed by ip_vs_ctl.c */
104 extern int ip_vs_conn_tab_size;
105
106 struct ip_vs_iphdr {
107 __u32 len; /* IPv4 simply where L4 starts
108 * IPv6 where L4 Transport Header starts */
109 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
110 __s16 protocol;
111 __s32 flags;
112 union nf_inet_addr saddr;
113 union nf_inet_addr daddr;
114 };
115
116 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
117 int len, void *buffer,
118 const struct ip_vs_iphdr *ipvsh)
119 {
120 return skb_header_pointer(skb, offset, len, buffer);
121 }
122
123 static inline void
124 ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
125 {
126 const struct iphdr *iph = nh;
127
128 iphdr->len = iph->ihl * 4;
129 iphdr->fragoffs = 0;
130 iphdr->protocol = iph->protocol;
131 iphdr->saddr.ip = iph->saddr;
132 iphdr->daddr.ip = iph->daddr;
133 }
134
135 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
136 * IPv6 requires some extra work, as finding proper header position,
137 * depend on the IPv6 extension headers.
138 */
139 static inline void
140 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
141 {
142 #ifdef CONFIG_IP_VS_IPV6
143 if (af == AF_INET6) {
144 const struct ipv6hdr *iph =
145 (struct ipv6hdr *)skb_network_header(skb);
146 iphdr->saddr.in6 = iph->saddr;
147 iphdr->daddr.in6 = iph->daddr;
148 /* ipv6_find_hdr() updates len, flags */
149 iphdr->len = 0;
150 iphdr->flags = 0;
151 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
152 &iphdr->fragoffs,
153 &iphdr->flags);
154 } else
155 #endif
156 {
157 const struct iphdr *iph =
158 (struct iphdr *)skb_network_header(skb);
159 iphdr->len = iph->ihl * 4;
160 iphdr->fragoffs = 0;
161 iphdr->protocol = iph->protocol;
162 iphdr->saddr.ip = iph->saddr;
163 iphdr->daddr.ip = iph->daddr;
164 }
165 }
166
167 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
168 const union nf_inet_addr *src)
169 {
170 #ifdef CONFIG_IP_VS_IPV6
171 if (af == AF_INET6)
172 dst->in6 = src->in6;
173 else
174 #endif
175 dst->ip = src->ip;
176 }
177
178 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
179 const union nf_inet_addr *src)
180 {
181 #ifdef CONFIG_IP_VS_IPV6
182 if (af == AF_INET6) {
183 dst->in6 = src->in6;
184 return;
185 }
186 #endif
187 dst->ip = src->ip;
188 dst->all[1] = 0;
189 dst->all[2] = 0;
190 dst->all[3] = 0;
191 }
192
193 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
194 const union nf_inet_addr *b)
195 {
196 #ifdef CONFIG_IP_VS_IPV6
197 if (af == AF_INET6)
198 return ipv6_addr_equal(&a->in6, &b->in6);
199 #endif
200 return a->ip == b->ip;
201 }
202
203 #ifdef CONFIG_IP_VS_DEBUG
204 #include <linux/net.h>
205
206 int ip_vs_get_debug_level(void);
207
208 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
209 const union nf_inet_addr *addr,
210 int *idx)
211 {
212 int len;
213 #ifdef CONFIG_IP_VS_IPV6
214 if (af == AF_INET6)
215 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
216 &addr->in6) + 1;
217 else
218 #endif
219 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
220 &addr->ip) + 1;
221
222 *idx += len;
223 BUG_ON(*idx > buf_len + 1);
224 return &buf[*idx - len];
225 }
226
227 #define IP_VS_DBG_BUF(level, msg, ...) \
228 do { \
229 char ip_vs_dbg_buf[160]; \
230 int ip_vs_dbg_idx = 0; \
231 if (level <= ip_vs_get_debug_level()) \
232 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
233 } while (0)
234 #define IP_VS_ERR_BUF(msg...) \
235 do { \
236 char ip_vs_dbg_buf[160]; \
237 int ip_vs_dbg_idx = 0; \
238 pr_err(msg); \
239 } while (0)
240
241 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
242 #define IP_VS_DBG_ADDR(af, addr) \
243 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
244 sizeof(ip_vs_dbg_buf), addr, \
245 &ip_vs_dbg_idx)
246
247 #define IP_VS_DBG(level, msg, ...) \
248 do { \
249 if (level <= ip_vs_get_debug_level()) \
250 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
251 } while (0)
252 #define IP_VS_DBG_RL(msg, ...) \
253 do { \
254 if (net_ratelimit()) \
255 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
256 } while (0)
257 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
258 do { \
259 if (level <= ip_vs_get_debug_level()) \
260 pp->debug_packet(af, pp, skb, ofs, msg); \
261 } while (0)
262 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
263 do { \
264 if (level <= ip_vs_get_debug_level() && \
265 net_ratelimit()) \
266 pp->debug_packet(af, pp, skb, ofs, msg); \
267 } while (0)
268 #else /* NO DEBUGGING at ALL */
269 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
270 #define IP_VS_ERR_BUF(msg...) do {} while (0)
271 #define IP_VS_DBG(level, msg...) do {} while (0)
272 #define IP_VS_DBG_RL(msg...) do {} while (0)
273 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
274 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
275 #endif
276
277 #define IP_VS_BUG() BUG()
278 #define IP_VS_ERR_RL(msg, ...) \
279 do { \
280 if (net_ratelimit()) \
281 pr_err(msg, ##__VA_ARGS__); \
282 } while (0)
283
284 #ifdef CONFIG_IP_VS_DEBUG
285 #define EnterFunction(level) \
286 do { \
287 if (level <= ip_vs_get_debug_level()) \
288 printk(KERN_DEBUG \
289 pr_fmt("Enter: %s, %s line %i\n"), \
290 __func__, __FILE__, __LINE__); \
291 } while (0)
292 #define LeaveFunction(level) \
293 do { \
294 if (level <= ip_vs_get_debug_level()) \
295 printk(KERN_DEBUG \
296 pr_fmt("Leave: %s, %s line %i\n"), \
297 __func__, __FILE__, __LINE__); \
298 } while (0)
299 #else
300 #define EnterFunction(level) do {} while (0)
301 #define LeaveFunction(level) do {} while (0)
302 #endif
303
304 /* The port number of FTP service (in network order). */
305 #define FTPPORT cpu_to_be16(21)
306 #define FTPDATA cpu_to_be16(20)
307
308 /* TCP State Values */
309 enum {
310 IP_VS_TCP_S_NONE = 0,
311 IP_VS_TCP_S_ESTABLISHED,
312 IP_VS_TCP_S_SYN_SENT,
313 IP_VS_TCP_S_SYN_RECV,
314 IP_VS_TCP_S_FIN_WAIT,
315 IP_VS_TCP_S_TIME_WAIT,
316 IP_VS_TCP_S_CLOSE,
317 IP_VS_TCP_S_CLOSE_WAIT,
318 IP_VS_TCP_S_LAST_ACK,
319 IP_VS_TCP_S_LISTEN,
320 IP_VS_TCP_S_SYNACK,
321 IP_VS_TCP_S_LAST
322 };
323
324 /* UDP State Values */
325 enum {
326 IP_VS_UDP_S_NORMAL,
327 IP_VS_UDP_S_LAST,
328 };
329
330 /* ICMP State Values */
331 enum {
332 IP_VS_ICMP_S_NORMAL,
333 IP_VS_ICMP_S_LAST,
334 };
335
336 /* SCTP State Values */
337 enum ip_vs_sctp_states {
338 IP_VS_SCTP_S_NONE,
339 IP_VS_SCTP_S_INIT1,
340 IP_VS_SCTP_S_INIT,
341 IP_VS_SCTP_S_COOKIE_SENT,
342 IP_VS_SCTP_S_COOKIE_REPLIED,
343 IP_VS_SCTP_S_COOKIE_WAIT,
344 IP_VS_SCTP_S_COOKIE,
345 IP_VS_SCTP_S_COOKIE_ECHOED,
346 IP_VS_SCTP_S_ESTABLISHED,
347 IP_VS_SCTP_S_SHUTDOWN_SENT,
348 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
349 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
350 IP_VS_SCTP_S_REJECTED,
351 IP_VS_SCTP_S_CLOSED,
352 IP_VS_SCTP_S_LAST
353 };
354
355 /* Delta sequence info structure
356 * Each ip_vs_conn has 2 (output AND input seq. changes).
357 * Only used in the VS/NAT.
358 */
359 struct ip_vs_seq {
360 __u32 init_seq; /* Add delta from this seq */
361 __u32 delta; /* Delta in sequence numbers */
362 __u32 previous_delta; /* Delta in sequence numbers
363 * before last resized pkt */
364 };
365
366 /* counters per cpu */
367 struct ip_vs_counters {
368 __u64 conns; /* connections scheduled */
369 __u64 inpkts; /* incoming packets */
370 __u64 outpkts; /* outgoing packets */
371 __u64 inbytes; /* incoming bytes */
372 __u64 outbytes; /* outgoing bytes */
373 };
374 /* Stats per cpu */
375 struct ip_vs_cpu_stats {
376 struct ip_vs_counters cnt;
377 struct u64_stats_sync syncp;
378 };
379
380 /* IPVS statistics objects */
381 struct ip_vs_estimator {
382 struct list_head list;
383
384 u64 last_inbytes;
385 u64 last_outbytes;
386 u64 last_conns;
387 u64 last_inpkts;
388 u64 last_outpkts;
389
390 u64 cps;
391 u64 inpps;
392 u64 outpps;
393 u64 inbps;
394 u64 outbps;
395 };
396
397 /*
398 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
399 */
400 struct ip_vs_kstats {
401 u64 conns; /* connections scheduled */
402 u64 inpkts; /* incoming packets */
403 u64 outpkts; /* outgoing packets */
404 u64 inbytes; /* incoming bytes */
405 u64 outbytes; /* outgoing bytes */
406
407 u64 cps; /* current connection rate */
408 u64 inpps; /* current in packet rate */
409 u64 outpps; /* current out packet rate */
410 u64 inbps; /* current in byte rate */
411 u64 outbps; /* current out byte rate */
412 };
413
414 struct ip_vs_stats {
415 struct ip_vs_kstats kstats; /* kernel statistics */
416 struct ip_vs_estimator est; /* estimator */
417 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
418 spinlock_t lock; /* spin lock */
419 struct ip_vs_kstats kstats0; /* reset values */
420 };
421
422 struct dst_entry;
423 struct iphdr;
424 struct ip_vs_conn;
425 struct ip_vs_app;
426 struct sk_buff;
427 struct ip_vs_proto_data;
428
429 struct ip_vs_protocol {
430 struct ip_vs_protocol *next;
431 char *name;
432 u16 protocol;
433 u16 num_states;
434 int dont_defrag;
435
436 void (*init)(struct ip_vs_protocol *pp);
437
438 void (*exit)(struct ip_vs_protocol *pp);
439
440 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
441
442 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
443
444 int (*conn_schedule)(int af, struct sk_buff *skb,
445 struct ip_vs_proto_data *pd,
446 int *verdict, struct ip_vs_conn **cpp,
447 struct ip_vs_iphdr *iph);
448
449 struct ip_vs_conn *
450 (*conn_in_get)(int af,
451 const struct sk_buff *skb,
452 const struct ip_vs_iphdr *iph,
453 int inverse);
454
455 struct ip_vs_conn *
456 (*conn_out_get)(int af,
457 const struct sk_buff *skb,
458 const struct ip_vs_iphdr *iph,
459 int inverse);
460
461 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
462 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
463
464 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
465 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
466
467 int (*csum_check)(int af, struct sk_buff *skb,
468 struct ip_vs_protocol *pp);
469
470 const char *(*state_name)(int state);
471
472 void (*state_transition)(struct ip_vs_conn *cp, int direction,
473 const struct sk_buff *skb,
474 struct ip_vs_proto_data *pd);
475
476 int (*register_app)(struct net *net, struct ip_vs_app *inc);
477
478 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
479
480 int (*app_conn_bind)(struct ip_vs_conn *cp);
481
482 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
483 const struct sk_buff *skb,
484 int offset,
485 const char *msg);
486
487 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
488 };
489
490 /* protocol data per netns */
491 struct ip_vs_proto_data {
492 struct ip_vs_proto_data *next;
493 struct ip_vs_protocol *pp;
494 int *timeout_table; /* protocol timeout table */
495 atomic_t appcnt; /* counter of proto app incs. */
496 struct tcp_states_t *tcp_state_table;
497 };
498
499 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
500 struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
501 unsigned short proto);
502
503 struct ip_vs_conn_param {
504 struct net *net;
505 const union nf_inet_addr *caddr;
506 const union nf_inet_addr *vaddr;
507 __be16 cport;
508 __be16 vport;
509 __u16 protocol;
510 u16 af;
511
512 const struct ip_vs_pe *pe;
513 char *pe_data;
514 __u8 pe_data_len;
515 };
516
517 /* IP_VS structure allocated for each dynamically scheduled connection */
518 struct ip_vs_conn {
519 struct hlist_node c_list; /* hashed list heads */
520 /* Protocol, addresses and port numbers */
521 __be16 cport;
522 __be16 dport;
523 __be16 vport;
524 u16 af; /* address family */
525 union nf_inet_addr caddr; /* client address */
526 union nf_inet_addr vaddr; /* virtual address */
527 union nf_inet_addr daddr; /* destination address */
528 volatile __u32 flags; /* status flags */
529 __u16 protocol; /* Which protocol (TCP/UDP) */
530 __u16 daf; /* Address family of the dest */
531 #ifdef CONFIG_NET_NS
532 struct net *net; /* Name space */
533 #endif
534
535 /* counter and timer */
536 atomic_t refcnt; /* reference count */
537 struct timer_list timer; /* Expiration timer */
538 volatile unsigned long timeout; /* timeout */
539
540 /* Flags and state transition */
541 spinlock_t lock; /* lock for state transition */
542 volatile __u16 state; /* state info */
543 volatile __u16 old_state; /* old state, to be used for
544 * state transition triggerd
545 * synchronization
546 */
547 __u32 fwmark; /* Fire wall mark from skb */
548 unsigned long sync_endtime; /* jiffies + sent_retries */
549
550 /* Control members */
551 struct ip_vs_conn *control; /* Master control connection */
552 atomic_t n_control; /* Number of controlled ones */
553 struct ip_vs_dest *dest; /* real server */
554 atomic_t in_pkts; /* incoming packet counter */
555
556 /* Packet transmitter for different forwarding methods. If it
557 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
558 * otherwise this must be changed to a sk_buff **.
559 * NF_ACCEPT can be returned when destination is local.
560 */
561 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
562 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
563
564 /* Note: we can group the following members into a structure,
565 * in order to save more space, and the following members are
566 * only used in VS/NAT anyway
567 */
568 struct ip_vs_app *app; /* bound ip_vs_app object */
569 void *app_data; /* Application private data */
570 struct ip_vs_seq in_seq; /* incoming seq. struct */
571 struct ip_vs_seq out_seq; /* outgoing seq. struct */
572
573 const struct ip_vs_pe *pe;
574 char *pe_data;
575 __u8 pe_data_len;
576
577 struct rcu_head rcu_head;
578 };
579
580 /* To save some memory in conn table when name space is disabled. */
581 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
582 {
583 #ifdef CONFIG_NET_NS
584 return cp->net;
585 #else
586 return &init_net;
587 #endif
588 }
589
590 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
591 {
592 #ifdef CONFIG_NET_NS
593 cp->net = net;
594 #endif
595 }
596
597 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
598 struct net *net)
599 {
600 #ifdef CONFIG_NET_NS
601 return cp->net == net;
602 #else
603 return 1;
604 #endif
605 }
606
607 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
608 * for IPv6 support.
609 *
610 * We need these to conveniently pass around service and destination
611 * options, but unfortunately, we also need to keep the old definitions to
612 * maintain userspace backwards compatibility for the setsockopt interface.
613 */
614 struct ip_vs_service_user_kern {
615 /* virtual service addresses */
616 u16 af;
617 u16 protocol;
618 union nf_inet_addr addr; /* virtual ip address */
619 __be16 port;
620 u32 fwmark; /* firwall mark of service */
621
622 /* virtual service options */
623 char *sched_name;
624 char *pe_name;
625 unsigned int flags; /* virtual service flags */
626 unsigned int timeout; /* persistent timeout in sec */
627 __be32 netmask; /* persistent netmask or plen */
628 };
629
630
631 struct ip_vs_dest_user_kern {
632 /* destination server address */
633 union nf_inet_addr addr;
634 __be16 port;
635
636 /* real server options */
637 unsigned int conn_flags; /* connection flags */
638 int weight; /* destination weight */
639
640 /* thresholds for active connections */
641 u32 u_threshold; /* upper threshold */
642 u32 l_threshold; /* lower threshold */
643
644 /* Address family of addr */
645 u16 af;
646 };
647
648
649 /*
650 * The information about the virtual service offered to the net and the
651 * forwarding entries.
652 */
653 struct ip_vs_service {
654 struct hlist_node s_list; /* for normal service table */
655 struct hlist_node f_list; /* for fwmark-based service table */
656 atomic_t refcnt; /* reference counter */
657
658 u16 af; /* address family */
659 __u16 protocol; /* which protocol (TCP/UDP) */
660 union nf_inet_addr addr; /* IP address for virtual service */
661 __be16 port; /* port number for the service */
662 __u32 fwmark; /* firewall mark of the service */
663 unsigned int flags; /* service status flags */
664 unsigned int timeout; /* persistent timeout in ticks */
665 __be32 netmask; /* grouping granularity, mask/plen */
666 struct net *net;
667
668 struct list_head destinations; /* real server d-linked list */
669 __u32 num_dests; /* number of servers */
670 struct ip_vs_stats stats; /* statistics for the service */
671
672 /* for scheduling */
673 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
674 spinlock_t sched_lock; /* lock sched_data */
675 void *sched_data; /* scheduler application data */
676
677 /* alternate persistence engine */
678 struct ip_vs_pe __rcu *pe;
679
680 struct rcu_head rcu_head;
681 };
682
683 /* Information for cached dst */
684 struct ip_vs_dest_dst {
685 struct dst_entry *dst_cache; /* destination cache entry */
686 u32 dst_cookie;
687 union nf_inet_addr dst_saddr;
688 struct rcu_head rcu_head;
689 };
690
691 /* The real server destination forwarding entry with ip address, port number,
692 * and so on.
693 */
694 struct ip_vs_dest {
695 struct list_head n_list; /* for the dests in the service */
696 struct hlist_node d_list; /* for table with all the dests */
697
698 u16 af; /* address family */
699 __be16 port; /* port number of the server */
700 union nf_inet_addr addr; /* IP address of the server */
701 volatile unsigned int flags; /* dest status flags */
702 atomic_t conn_flags; /* flags to copy to conn */
703 atomic_t weight; /* server weight */
704
705 atomic_t refcnt; /* reference counter */
706 struct ip_vs_stats stats; /* statistics */
707 unsigned long idle_start; /* start time, jiffies */
708
709 /* connection counters and thresholds */
710 atomic_t activeconns; /* active connections */
711 atomic_t inactconns; /* inactive connections */
712 atomic_t persistconns; /* persistent connections */
713 __u32 u_threshold; /* upper threshold */
714 __u32 l_threshold; /* lower threshold */
715
716 /* for destination cache */
717 spinlock_t dst_lock; /* lock of dst_cache */
718 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
719
720 /* for virtual service */
721 struct ip_vs_service __rcu *svc; /* service it belongs to */
722 __u16 protocol; /* which protocol (TCP/UDP) */
723 __be16 vport; /* virtual port number */
724 union nf_inet_addr vaddr; /* virtual IP address */
725 __u32 vfwmark; /* firewall mark of service */
726
727 struct list_head t_list; /* in dest_trash */
728 unsigned int in_rs_table:1; /* we are in rs_table */
729 };
730
731 /* The scheduler object */
732 struct ip_vs_scheduler {
733 struct list_head n_list; /* d-linked list head */
734 char *name; /* scheduler name */
735 atomic_t refcnt; /* reference counter */
736 struct module *module; /* THIS_MODULE/NULL */
737
738 /* scheduler initializing service */
739 int (*init_service)(struct ip_vs_service *svc);
740 /* scheduling service finish */
741 void (*done_service)(struct ip_vs_service *svc);
742 /* dest is linked */
743 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
744 /* dest is unlinked */
745 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
746 /* dest is updated */
747 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
748
749 /* selecting a server from the given service */
750 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
751 const struct sk_buff *skb,
752 struct ip_vs_iphdr *iph);
753 };
754
755 /* The persistence engine object */
756 struct ip_vs_pe {
757 struct list_head n_list; /* d-linked list head */
758 char *name; /* scheduler name */
759 atomic_t refcnt; /* reference counter */
760 struct module *module; /* THIS_MODULE/NULL */
761
762 /* get the connection template, if any */
763 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
764 bool (*ct_match)(const struct ip_vs_conn_param *p,
765 struct ip_vs_conn *ct);
766 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
767 bool inverse);
768 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
769 };
770
771 /* The application module object (a.k.a. app incarnation) */
772 struct ip_vs_app {
773 struct list_head a_list; /* member in app list */
774 int type; /* IP_VS_APP_TYPE_xxx */
775 char *name; /* application module name */
776 __u16 protocol;
777 struct module *module; /* THIS_MODULE/NULL */
778 struct list_head incs_list; /* list of incarnations */
779
780 /* members for application incarnations */
781 struct list_head p_list; /* member in proto app list */
782 struct ip_vs_app *app; /* its real application */
783 __be16 port; /* port number in net order */
784 atomic_t usecnt; /* usage counter */
785 struct rcu_head rcu_head;
786
787 /* output hook: Process packet in inout direction, diff set for TCP.
788 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
789 * 2=Mangled but checksum was not updated
790 */
791 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
792 struct sk_buff *, int *diff);
793
794 /* input hook: Process packet in outin direction, diff set for TCP.
795 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
796 * 2=Mangled but checksum was not updated
797 */
798 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
799 struct sk_buff *, int *diff);
800
801 /* ip_vs_app initializer */
802 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
803
804 /* ip_vs_app finish */
805 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
806
807
808 /* not used now */
809 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
810 struct ip_vs_protocol *);
811
812 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
813
814 int * timeout_table;
815 int * timeouts;
816 int timeouts_size;
817
818 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
819 int *verdict, struct ip_vs_conn **cpp);
820
821 struct ip_vs_conn *
822 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
823 const struct iphdr *iph, int inverse);
824
825 struct ip_vs_conn *
826 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
827 const struct iphdr *iph, int inverse);
828
829 int (*state_transition)(struct ip_vs_conn *cp, int direction,
830 const struct sk_buff *skb,
831 struct ip_vs_app *app);
832
833 void (*timeout_change)(struct ip_vs_app *app, int flags);
834 };
835
836 struct ipvs_master_sync_state {
837 struct list_head sync_queue;
838 struct ip_vs_sync_buff *sync_buff;
839 unsigned long sync_queue_len;
840 unsigned int sync_queue_delay;
841 struct task_struct *master_thread;
842 struct delayed_work master_wakeup_work;
843 struct netns_ipvs *ipvs;
844 };
845
846 /* How much time to keep dests in trash */
847 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
848
849 struct ipvs_sync_daemon_cfg {
850 union nf_inet_addr mcast_group;
851 int syncid;
852 u16 sync_maxlen;
853 u16 mcast_port;
854 u8 mcast_af;
855 u8 mcast_ttl;
856 /* multicast interface name */
857 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
858 };
859
860 /* IPVS in network namespace */
861 struct netns_ipvs {
862 int gen; /* Generation */
863 int enable; /* enable like nf_hooks do */
864 /* Hash table: for real service lookups */
865 #define IP_VS_RTAB_BITS 4
866 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
867 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
868
869 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
870 /* ip_vs_app */
871 struct list_head app_list;
872 /* ip_vs_proto */
873 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
874 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
875 /* ip_vs_proto_tcp */
876 #ifdef CONFIG_IP_VS_PROTO_TCP
877 #define TCP_APP_TAB_BITS 4
878 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
879 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
880 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
881 #endif
882 /* ip_vs_proto_udp */
883 #ifdef CONFIG_IP_VS_PROTO_UDP
884 #define UDP_APP_TAB_BITS 4
885 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
886 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
887 struct list_head udp_apps[UDP_APP_TAB_SIZE];
888 #endif
889 /* ip_vs_proto_sctp */
890 #ifdef CONFIG_IP_VS_PROTO_SCTP
891 #define SCTP_APP_TAB_BITS 4
892 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
893 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
894 /* Hash table for SCTP application incarnations */
895 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
896 #endif
897 /* ip_vs_conn */
898 atomic_t conn_count; /* connection counter */
899
900 /* ip_vs_ctl */
901 struct ip_vs_stats tot_stats; /* Statistics & est. */
902
903 int num_services; /* no of virtual services */
904
905 /* Trash for destinations */
906 struct list_head dest_trash;
907 spinlock_t dest_trash_lock;
908 struct timer_list dest_trash_timer; /* expiration timer */
909 /* Service counters */
910 atomic_t ftpsvc_counter;
911 atomic_t nullsvc_counter;
912
913 #ifdef CONFIG_SYSCTL
914 /* 1/rate drop and drop-entry variables */
915 struct delayed_work defense_work; /* Work handler */
916 int drop_rate;
917 int drop_counter;
918 atomic_t dropentry;
919 /* locks in ctl.c */
920 spinlock_t dropentry_lock; /* drop entry handling */
921 spinlock_t droppacket_lock; /* drop packet handling */
922 spinlock_t securetcp_lock; /* state and timeout tables */
923
924 /* sys-ctl struct */
925 struct ctl_table_header *sysctl_hdr;
926 struct ctl_table *sysctl_tbl;
927 #endif
928
929 /* sysctl variables */
930 int sysctl_amemthresh;
931 int sysctl_am_droprate;
932 int sysctl_drop_entry;
933 int sysctl_drop_packet;
934 int sysctl_secure_tcp;
935 #ifdef CONFIG_IP_VS_NFCT
936 int sysctl_conntrack;
937 #endif
938 int sysctl_snat_reroute;
939 int sysctl_sync_ver;
940 int sysctl_sync_ports;
941 int sysctl_sync_persist_mode;
942 unsigned long sysctl_sync_qlen_max;
943 int sysctl_sync_sock_size;
944 int sysctl_cache_bypass;
945 int sysctl_expire_nodest_conn;
946 int sysctl_sloppy_tcp;
947 int sysctl_sloppy_sctp;
948 int sysctl_expire_quiescent_template;
949 int sysctl_sync_threshold[2];
950 unsigned int sysctl_sync_refresh_period;
951 int sysctl_sync_retries;
952 int sysctl_nat_icmp_send;
953 int sysctl_pmtu_disc;
954 int sysctl_backup_only;
955 int sysctl_conn_reuse_mode;
956
957 /* ip_vs_lblc */
958 int sysctl_lblc_expiration;
959 struct ctl_table_header *lblc_ctl_header;
960 struct ctl_table *lblc_ctl_table;
961 /* ip_vs_lblcr */
962 int sysctl_lblcr_expiration;
963 struct ctl_table_header *lblcr_ctl_header;
964 struct ctl_table *lblcr_ctl_table;
965 /* ip_vs_est */
966 struct list_head est_list; /* estimator list */
967 spinlock_t est_lock;
968 struct timer_list est_timer; /* Estimation timer */
969 /* ip_vs_sync */
970 spinlock_t sync_lock;
971 struct ipvs_master_sync_state *ms;
972 spinlock_t sync_buff_lock;
973 struct task_struct **backup_threads;
974 int threads_mask;
975 volatile int sync_state;
976 struct mutex sync_mutex;
977 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
978 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
979 /* net name space ptr */
980 struct net *net; /* Needed by timer routines */
981 /* Number of heterogeneous destinations, needed becaus heterogeneous
982 * are not supported when synchronization is enabled.
983 */
984 unsigned int mixed_address_family_dests;
985 };
986
987 #define DEFAULT_SYNC_THRESHOLD 3
988 #define DEFAULT_SYNC_PERIOD 50
989 #define DEFAULT_SYNC_VER 1
990 #define DEFAULT_SLOPPY_TCP 0
991 #define DEFAULT_SLOPPY_SCTP 0
992 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
993 #define DEFAULT_SYNC_RETRIES 0
994 #define IPVS_SYNC_WAKEUP_RATE 8
995 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
996 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
997 #define IPVS_SYNC_CHECK_PERIOD HZ
998 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
999 #define IPVS_SYNC_PORTS_MAX (1 << 6)
1000
1001 #ifdef CONFIG_SYSCTL
1002
1003 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1004 {
1005 return ipvs->sysctl_sync_threshold[0];
1006 }
1007
1008 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1009 {
1010 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1011 }
1012
1013 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1014 {
1015 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1016 }
1017
1018 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1019 {
1020 return ipvs->sysctl_sync_retries;
1021 }
1022
1023 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1024 {
1025 return ipvs->sysctl_sync_ver;
1026 }
1027
1028 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1029 {
1030 return ipvs->sysctl_sloppy_tcp;
1031 }
1032
1033 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1034 {
1035 return ipvs->sysctl_sloppy_sctp;
1036 }
1037
1038 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1039 {
1040 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1041 }
1042
1043 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1044 {
1045 return ipvs->sysctl_sync_persist_mode;
1046 }
1047
1048 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1049 {
1050 return ipvs->sysctl_sync_qlen_max;
1051 }
1052
1053 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1054 {
1055 return ipvs->sysctl_sync_sock_size;
1056 }
1057
1058 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1059 {
1060 return ipvs->sysctl_pmtu_disc;
1061 }
1062
1063 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1064 {
1065 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1066 ipvs->sysctl_backup_only;
1067 }
1068
1069 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1070 {
1071 return ipvs->sysctl_conn_reuse_mode;
1072 }
1073
1074 #else
1075
1076 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1077 {
1078 return DEFAULT_SYNC_THRESHOLD;
1079 }
1080
1081 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1082 {
1083 return DEFAULT_SYNC_PERIOD;
1084 }
1085
1086 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1087 {
1088 return DEFAULT_SYNC_REFRESH_PERIOD;
1089 }
1090
1091 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1092 {
1093 return DEFAULT_SYNC_RETRIES & 3;
1094 }
1095
1096 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1097 {
1098 return DEFAULT_SYNC_VER;
1099 }
1100
1101 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1102 {
1103 return DEFAULT_SLOPPY_TCP;
1104 }
1105
1106 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1107 {
1108 return DEFAULT_SLOPPY_SCTP;
1109 }
1110
1111 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1112 {
1113 return 1;
1114 }
1115
1116 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1117 {
1118 return 0;
1119 }
1120
1121 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1122 {
1123 return IPVS_SYNC_QLEN_MAX;
1124 }
1125
1126 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1127 {
1128 return 0;
1129 }
1130
1131 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1132 {
1133 return 1;
1134 }
1135
1136 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1137 {
1138 return 0;
1139 }
1140
1141 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1142 {
1143 return 1;
1144 }
1145
1146 #endif
1147
1148 /* IPVS core functions
1149 * (from ip_vs_core.c)
1150 */
1151 const char *ip_vs_proto_name(unsigned int proto);
1152 void ip_vs_init_hash_table(struct list_head *table, int rows);
1153 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1154
1155 #define IP_VS_APP_TYPE_FTP 1
1156
1157 /* ip_vs_conn handling functions
1158 * (from ip_vs_conn.c)
1159 */
1160 enum {
1161 IP_VS_DIR_INPUT = 0,
1162 IP_VS_DIR_OUTPUT,
1163 IP_VS_DIR_INPUT_ONLY,
1164 IP_VS_DIR_LAST,
1165 };
1166
1167 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1168 const union nf_inet_addr *caddr,
1169 __be16 cport,
1170 const union nf_inet_addr *vaddr,
1171 __be16 vport,
1172 struct ip_vs_conn_param *p)
1173 {
1174 p->net = net;
1175 p->af = af;
1176 p->protocol = protocol;
1177 p->caddr = caddr;
1178 p->cport = cport;
1179 p->vaddr = vaddr;
1180 p->vport = vport;
1181 p->pe = NULL;
1182 p->pe_data = NULL;
1183 }
1184
1185 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1186 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1187
1188 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1189 const struct ip_vs_iphdr *iph,
1190 int inverse);
1191
1192 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1193
1194 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1195 const struct ip_vs_iphdr *iph,
1196 int inverse);
1197
1198 /* Get reference to gain full access to conn.
1199 * By default, RCU read-side critical sections have access only to
1200 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1201 */
1202 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1203 {
1204 return atomic_inc_not_zero(&cp->refcnt);
1205 }
1206
1207 /* put back the conn without restarting its timer */
1208 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1209 {
1210 smp_mb__before_atomic();
1211 atomic_dec(&cp->refcnt);
1212 }
1213 void ip_vs_conn_put(struct ip_vs_conn *cp);
1214 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1215
1216 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1217 const union nf_inet_addr *daddr,
1218 __be16 dport, unsigned int flags,
1219 struct ip_vs_dest *dest, __u32 fwmark);
1220 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1221
1222 const char *ip_vs_state_name(__u16 proto, int state);
1223
1224 void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1225 int ip_vs_check_template(struct ip_vs_conn *ct);
1226 void ip_vs_random_dropentry(struct net *net);
1227 int ip_vs_conn_init(void);
1228 void ip_vs_conn_cleanup(void);
1229
1230 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1231 {
1232 struct ip_vs_conn *ctl_cp = cp->control;
1233 if (!ctl_cp) {
1234 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1235 "%s:%d to %s:%d\n",
1236 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1237 ntohs(cp->cport),
1238 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1239 ntohs(cp->vport));
1240
1241 return;
1242 }
1243
1244 IP_VS_DBG_BUF(7, "DELeting control for: "
1245 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1246 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1247 ntohs(cp->cport),
1248 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1249 ntohs(ctl_cp->cport));
1250
1251 cp->control = NULL;
1252 if (atomic_read(&ctl_cp->n_control) == 0) {
1253 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1254 "%s:%d to %s:%d\n",
1255 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1256 ntohs(cp->cport),
1257 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1258 ntohs(cp->vport));
1259
1260 return;
1261 }
1262 atomic_dec(&ctl_cp->n_control);
1263 }
1264
1265 static inline void
1266 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1267 {
1268 if (cp->control) {
1269 IP_VS_ERR_BUF("request control ADD for already controlled: "
1270 "%s:%d to %s:%d\n",
1271 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1272 ntohs(cp->cport),
1273 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1274 ntohs(cp->vport));
1275
1276 ip_vs_control_del(cp);
1277 }
1278
1279 IP_VS_DBG_BUF(7, "ADDing control for: "
1280 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1281 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1282 ntohs(cp->cport),
1283 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1284 ntohs(ctl_cp->cport));
1285
1286 cp->control = ctl_cp;
1287 atomic_inc(&ctl_cp->n_control);
1288 }
1289
1290 /* IPVS netns init & cleanup functions */
1291 int ip_vs_estimator_net_init(struct net *net);
1292 int ip_vs_control_net_init(struct net *net);
1293 int ip_vs_protocol_net_init(struct net *net);
1294 int ip_vs_app_net_init(struct net *net);
1295 int ip_vs_conn_net_init(struct net *net);
1296 int ip_vs_sync_net_init(struct net *net);
1297 void ip_vs_conn_net_cleanup(struct net *net);
1298 void ip_vs_app_net_cleanup(struct net *net);
1299 void ip_vs_protocol_net_cleanup(struct net *net);
1300 void ip_vs_control_net_cleanup(struct net *net);
1301 void ip_vs_estimator_net_cleanup(struct net *net);
1302 void ip_vs_sync_net_cleanup(struct net *net);
1303 void ip_vs_service_net_cleanup(struct net *net);
1304
1305 /* IPVS application functions
1306 * (from ip_vs_app.c)
1307 */
1308 #define IP_VS_APP_MAX_PORTS 8
1309 struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1310 void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1311 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1312 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1313 int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
1314 __u16 port);
1315 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1316 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1317
1318 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1319 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1320
1321 int register_ip_vs_pe(struct ip_vs_pe *pe);
1322 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1323 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1324 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1325
1326 /* Use a #define to avoid all of module.h just for these trivial ops */
1327 #define ip_vs_pe_get(pe) \
1328 if (pe && pe->module) \
1329 __module_get(pe->module);
1330
1331 #define ip_vs_pe_put(pe) \
1332 if (pe && pe->module) \
1333 module_put(pe->module);
1334
1335 /* IPVS protocol functions (from ip_vs_proto.c) */
1336 int ip_vs_protocol_init(void);
1337 void ip_vs_protocol_cleanup(void);
1338 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1339 int *ip_vs_create_timeout_table(int *table, int size);
1340 int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1341 const char *name, int to);
1342 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1343 const struct sk_buff *skb, int offset,
1344 const char *msg);
1345
1346 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1347 extern struct ip_vs_protocol ip_vs_protocol_udp;
1348 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1349 extern struct ip_vs_protocol ip_vs_protocol_esp;
1350 extern struct ip_vs_protocol ip_vs_protocol_ah;
1351 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1352
1353 /* Registering/unregistering scheduler functions
1354 * (from ip_vs_sched.c)
1355 */
1356 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1357 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1358 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1359 struct ip_vs_scheduler *scheduler);
1360 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1361 struct ip_vs_scheduler *sched);
1362 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1363 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1364 struct ip_vs_conn *
1365 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1366 struct ip_vs_proto_data *pd, int *ignored,
1367 struct ip_vs_iphdr *iph);
1368 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1369 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1370
1371 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1372
1373 /* IPVS control data and functions (from ip_vs_ctl.c) */
1374 extern struct ip_vs_stats ip_vs_stats;
1375 extern int sysctl_ip_vs_sync_ver;
1376
1377 struct ip_vs_service *
1378 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1379 const union nf_inet_addr *vaddr, __be16 vport);
1380
1381 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1382 const union nf_inet_addr *daddr, __be16 dport);
1383
1384 int ip_vs_use_count_inc(void);
1385 void ip_vs_use_count_dec(void);
1386 int ip_vs_register_nl_ioctl(void);
1387 void ip_vs_unregister_nl_ioctl(void);
1388 int ip_vs_control_init(void);
1389 void ip_vs_control_cleanup(void);
1390 struct ip_vs_dest *
1391 ip_vs_find_dest(struct net *net, int svc_af, int dest_af,
1392 const union nf_inet_addr *daddr, __be16 dport,
1393 const union nf_inet_addr *vaddr, __be16 vport,
1394 __u16 protocol, __u32 fwmark, __u32 flags);
1395 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1396
1397 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1398 {
1399 atomic_inc(&dest->refcnt);
1400 }
1401
1402 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1403 {
1404 smp_mb__before_atomic();
1405 atomic_dec(&dest->refcnt);
1406 }
1407
1408 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1409 {
1410 if (atomic_dec_return(&dest->refcnt) < 0)
1411 kfree(dest);
1412 }
1413
1414 /* IPVS sync daemon data and function prototypes
1415 * (from ip_vs_sync.c)
1416 */
1417 int start_sync_thread(struct net *net, struct ipvs_sync_daemon_cfg *cfg,
1418 int state);
1419 int stop_sync_thread(struct net *net, int state);
1420 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1421
1422 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1423 void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1424 void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1425 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1426 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1427
1428 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1429 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1430 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1431 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1432 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1433 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1434 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1435 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1436 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1437 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1438 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1439 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1440 struct ip_vs_protocol *pp, int offset,
1441 unsigned int hooknum, struct ip_vs_iphdr *iph);
1442 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1443
1444 #ifdef CONFIG_IP_VS_IPV6
1445 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1447 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1448 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1449 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1450 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1451 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1452 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1453 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1454 struct ip_vs_protocol *pp, int offset,
1455 unsigned int hooknum, struct ip_vs_iphdr *iph);
1456 #endif
1457
1458 #ifdef CONFIG_SYSCTL
1459 /* This is a simple mechanism to ignore packets when
1460 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1461 * we start to drop 1/rate of the packets
1462 */
1463 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1464 {
1465 if (!ipvs->drop_rate)
1466 return 0;
1467 if (--ipvs->drop_counter > 0)
1468 return 0;
1469 ipvs->drop_counter = ipvs->drop_rate;
1470 return 1;
1471 }
1472 #else
1473 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1474 #endif
1475
1476 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1477 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1478
1479 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1480 {
1481 char fwd;
1482
1483 switch (IP_VS_FWD_METHOD(cp)) {
1484 case IP_VS_CONN_F_MASQ:
1485 fwd = 'M'; break;
1486 case IP_VS_CONN_F_LOCALNODE:
1487 fwd = 'L'; break;
1488 case IP_VS_CONN_F_TUNNEL:
1489 fwd = 'T'; break;
1490 case IP_VS_CONN_F_DROUTE:
1491 fwd = 'R'; break;
1492 case IP_VS_CONN_F_BYPASS:
1493 fwd = 'B'; break;
1494 default:
1495 fwd = '?'; break;
1496 }
1497 return fwd;
1498 }
1499
1500 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1501 struct ip_vs_conn *cp, int dir);
1502
1503 #ifdef CONFIG_IP_VS_IPV6
1504 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1505 struct ip_vs_conn *cp, int dir);
1506 #endif
1507
1508 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1509
1510 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1511 {
1512 __be32 diff[2] = { ~old, new };
1513
1514 return csum_partial(diff, sizeof(diff), oldsum);
1515 }
1516
1517 #ifdef CONFIG_IP_VS_IPV6
1518 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1519 __wsum oldsum)
1520 {
1521 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1522 new[3], new[2], new[1], new[0] };
1523
1524 return csum_partial(diff, sizeof(diff), oldsum);
1525 }
1526 #endif
1527
1528 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1529 {
1530 __be16 diff[2] = { ~old, new };
1531
1532 return csum_partial(diff, sizeof(diff), oldsum);
1533 }
1534
1535 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1536 static inline void ip_vs_notrack(struct sk_buff *skb)
1537 {
1538 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1539 enum ip_conntrack_info ctinfo;
1540 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1541
1542 if (!ct || !nf_ct_is_untracked(ct)) {
1543 nf_conntrack_put(skb->nfct);
1544 skb->nfct = &nf_ct_untracked_get()->ct_general;
1545 skb->nfctinfo = IP_CT_NEW;
1546 nf_conntrack_get(skb->nfct);
1547 }
1548 #endif
1549 }
1550
1551 #ifdef CONFIG_IP_VS_NFCT
1552 /* Netfilter connection tracking
1553 * (from ip_vs_nfct.c)
1554 */
1555 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1556 {
1557 #ifdef CONFIG_SYSCTL
1558 return ipvs->sysctl_conntrack;
1559 #else
1560 return 0;
1561 #endif
1562 }
1563
1564 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1565 int outin);
1566 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1567 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1568 struct ip_vs_conn *cp, u_int8_t proto,
1569 const __be16 port, int from_rs);
1570 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1571
1572 #else
1573
1574 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1575 {
1576 return 0;
1577 }
1578
1579 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1580 struct ip_vs_conn *cp, int outin)
1581 {
1582 }
1583
1584 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1585 {
1586 return NF_ACCEPT;
1587 }
1588
1589 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1590 {
1591 }
1592 #endif /* CONFIG_IP_VS_NFCT */
1593
1594 static inline int
1595 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1596 {
1597 /* We think the overhead of processing active connections is 256
1598 * times higher than that of inactive connections in average. (This
1599 * 256 times might not be accurate, we will change it later) We
1600 * use the following formula to estimate the overhead now:
1601 * dest->activeconns*256 + dest->inactconns
1602 */
1603 return (atomic_read(&dest->activeconns) << 8) +
1604 atomic_read(&dest->inactconns);
1605 }
1606
1607 #endif /* _NET_IP_VS_H */
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