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[mirror_ubuntu-artful-kernel.git] / include / net / ip_vs.h
1 /*
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/compiler.h>
17 #include <linux/timer.h>
18 #include <linux/bug.h>
19
20 #include <net/checksum.h>
21 #include <linux/netfilter.h> /* for union nf_inet_addr */
22 #include <linux/ip.h>
23 #include <linux/ipv6.h> /* for struct ipv6hdr */
24 #include <net/ipv6.h>
25 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
26 #include <linux/netfilter_ipv6/ip6_tables.h>
27 #endif
28 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
29 #include <net/netfilter/nf_conntrack.h>
30 #endif
31 #include <net/net_namespace.h> /* Netw namespace */
32
33 /*
34 * Generic access of ipvs struct
35 */
36 static inline struct netns_ipvs *net_ipvs(struct net* net)
37 {
38 return net->ipvs;
39 }
40 /*
41 * Get net ptr from skb in traffic cases
42 * use skb_sknet when call is from userland (ioctl or netlink)
43 */
44 static inline struct net *skb_net(const struct sk_buff *skb)
45 {
46 #ifdef CONFIG_NET_NS
47 #ifdef CONFIG_IP_VS_DEBUG
48 /*
49 * This is used for debug only.
50 * Start with the most likely hit
51 * End with BUG
52 */
53 if (likely(skb->dev && skb->dev->nd_net))
54 return dev_net(skb->dev);
55 if (skb_dst(skb) && skb_dst(skb)->dev)
56 return dev_net(skb_dst(skb)->dev);
57 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
58 __func__, __LINE__);
59 if (likely(skb->sk && skb->sk->sk_net))
60 return sock_net(skb->sk);
61 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
62 __func__, __LINE__);
63 BUG();
64 #else
65 return dev_net(skb->dev ? : skb_dst(skb)->dev);
66 #endif
67 #else
68 return &init_net;
69 #endif
70 }
71
72 static inline struct net *skb_sknet(const struct sk_buff *skb)
73 {
74 #ifdef CONFIG_NET_NS
75 #ifdef CONFIG_IP_VS_DEBUG
76 /* Start with the most likely hit */
77 if (likely(skb->sk && skb->sk->sk_net))
78 return sock_net(skb->sk);
79 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
80 __func__, __LINE__);
81 if (likely(skb->dev && skb->dev->nd_net))
82 return dev_net(skb->dev);
83 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
84 __func__, __LINE__);
85 BUG();
86 #else
87 return sock_net(skb->sk);
88 #endif
89 #else
90 return &init_net;
91 #endif
92 }
93 /*
94 * This one needed for single_open_net since net is stored directly in
95 * private not as a struct i.e. seq_file_net can't be used.
96 */
97 static inline struct net *seq_file_single_net(struct seq_file *seq)
98 {
99 #ifdef CONFIG_NET_NS
100 return (struct net *)seq->private;
101 #else
102 return &init_net;
103 #endif
104 }
105
106 /* Connections' size value needed by ip_vs_ctl.c */
107 extern int ip_vs_conn_tab_size;
108
109 struct ip_vs_iphdr {
110 __u32 len; /* IPv4 simply where L4 starts
111 IPv6 where L4 Transport Header starts */
112 __u32 thoff_reasm; /* Transport Header Offset in nfct_reasm skb */
113 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
114 __s16 protocol;
115 __s32 flags;
116 union nf_inet_addr saddr;
117 union nf_inet_addr daddr;
118 };
119
120 /* Dependency to module: nf_defrag_ipv6 */
121 #if defined(CONFIG_NF_DEFRAG_IPV6) || defined(CONFIG_NF_DEFRAG_IPV6_MODULE)
122 static inline struct sk_buff *skb_nfct_reasm(const struct sk_buff *skb)
123 {
124 return skb->nfct_reasm;
125 }
126 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
127 int len, void *buffer,
128 const struct ip_vs_iphdr *ipvsh)
129 {
130 if (unlikely(ipvsh->fragoffs && skb_nfct_reasm(skb)))
131 return skb_header_pointer(skb_nfct_reasm(skb),
132 ipvsh->thoff_reasm, len, buffer);
133
134 return skb_header_pointer(skb, offset, len, buffer);
135 }
136 #else
137 static inline struct sk_buff *skb_nfct_reasm(const struct sk_buff *skb)
138 {
139 return NULL;
140 }
141 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
142 int len, void *buffer,
143 const struct ip_vs_iphdr *ipvsh)
144 {
145 return skb_header_pointer(skb, offset, len, buffer);
146 }
147 #endif
148
149 static inline void
150 ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
151 {
152 const struct iphdr *iph = nh;
153
154 iphdr->len = iph->ihl * 4;
155 iphdr->fragoffs = 0;
156 iphdr->protocol = iph->protocol;
157 iphdr->saddr.ip = iph->saddr;
158 iphdr->daddr.ip = iph->daddr;
159 }
160
161 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
162 * IPv6 requires some extra work, as finding proper header position,
163 * depend on the IPv6 extension headers.
164 */
165 static inline void
166 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
167 {
168 #ifdef CONFIG_IP_VS_IPV6
169 if (af == AF_INET6) {
170 const struct ipv6hdr *iph =
171 (struct ipv6hdr *)skb_network_header(skb);
172 iphdr->saddr.in6 = iph->saddr;
173 iphdr->daddr.in6 = iph->daddr;
174 /* ipv6_find_hdr() updates len, flags, thoff_reasm */
175 iphdr->thoff_reasm = 0;
176 iphdr->len = 0;
177 iphdr->flags = 0;
178 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
179 &iphdr->fragoffs,
180 &iphdr->flags);
181 /* get proto from re-assembled packet and it's offset */
182 if (skb_nfct_reasm(skb))
183 iphdr->protocol = ipv6_find_hdr(skb_nfct_reasm(skb),
184 &iphdr->thoff_reasm,
185 -1, NULL, NULL);
186
187 } else
188 #endif
189 {
190 const struct iphdr *iph =
191 (struct iphdr *)skb_network_header(skb);
192 iphdr->len = iph->ihl * 4;
193 iphdr->fragoffs = 0;
194 iphdr->protocol = iph->protocol;
195 iphdr->saddr.ip = iph->saddr;
196 iphdr->daddr.ip = iph->daddr;
197 }
198 }
199
200 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
201 const union nf_inet_addr *src)
202 {
203 #ifdef CONFIG_IP_VS_IPV6
204 if (af == AF_INET6)
205 dst->in6 = src->in6;
206 else
207 #endif
208 dst->ip = src->ip;
209 }
210
211 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
212 const union nf_inet_addr *src)
213 {
214 #ifdef CONFIG_IP_VS_IPV6
215 if (af == AF_INET6) {
216 dst->in6 = src->in6;
217 return;
218 }
219 #endif
220 dst->ip = src->ip;
221 dst->all[1] = 0;
222 dst->all[2] = 0;
223 dst->all[3] = 0;
224 }
225
226 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
227 const union nf_inet_addr *b)
228 {
229 #ifdef CONFIG_IP_VS_IPV6
230 if (af == AF_INET6)
231 return ipv6_addr_equal(&a->in6, &b->in6);
232 #endif
233 return a->ip == b->ip;
234 }
235
236 #ifdef CONFIG_IP_VS_DEBUG
237 #include <linux/net.h>
238
239 extern int ip_vs_get_debug_level(void);
240
241 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
242 const union nf_inet_addr *addr,
243 int *idx)
244 {
245 int len;
246 #ifdef CONFIG_IP_VS_IPV6
247 if (af == AF_INET6)
248 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
249 &addr->in6) + 1;
250 else
251 #endif
252 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
253 &addr->ip) + 1;
254
255 *idx += len;
256 BUG_ON(*idx > buf_len + 1);
257 return &buf[*idx - len];
258 }
259
260 #define IP_VS_DBG_BUF(level, msg, ...) \
261 do { \
262 char ip_vs_dbg_buf[160]; \
263 int ip_vs_dbg_idx = 0; \
264 if (level <= ip_vs_get_debug_level()) \
265 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
266 } while (0)
267 #define IP_VS_ERR_BUF(msg...) \
268 do { \
269 char ip_vs_dbg_buf[160]; \
270 int ip_vs_dbg_idx = 0; \
271 pr_err(msg); \
272 } while (0)
273
274 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
275 #define IP_VS_DBG_ADDR(af, addr) \
276 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
277 sizeof(ip_vs_dbg_buf), addr, \
278 &ip_vs_dbg_idx)
279
280 #define IP_VS_DBG(level, msg, ...) \
281 do { \
282 if (level <= ip_vs_get_debug_level()) \
283 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
284 } while (0)
285 #define IP_VS_DBG_RL(msg, ...) \
286 do { \
287 if (net_ratelimit()) \
288 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
289 } while (0)
290 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
291 do { \
292 if (level <= ip_vs_get_debug_level()) \
293 pp->debug_packet(af, pp, skb, ofs, msg); \
294 } while (0)
295 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
296 do { \
297 if (level <= ip_vs_get_debug_level() && \
298 net_ratelimit()) \
299 pp->debug_packet(af, pp, skb, ofs, msg); \
300 } while (0)
301 #else /* NO DEBUGGING at ALL */
302 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
303 #define IP_VS_ERR_BUF(msg...) do {} while (0)
304 #define IP_VS_DBG(level, msg...) do {} while (0)
305 #define IP_VS_DBG_RL(msg...) do {} while (0)
306 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
307 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
308 #endif
309
310 #define IP_VS_BUG() BUG()
311 #define IP_VS_ERR_RL(msg, ...) \
312 do { \
313 if (net_ratelimit()) \
314 pr_err(msg, ##__VA_ARGS__); \
315 } while (0)
316
317 #ifdef CONFIG_IP_VS_DEBUG
318 #define EnterFunction(level) \
319 do { \
320 if (level <= ip_vs_get_debug_level()) \
321 printk(KERN_DEBUG \
322 pr_fmt("Enter: %s, %s line %i\n"), \
323 __func__, __FILE__, __LINE__); \
324 } while (0)
325 #define LeaveFunction(level) \
326 do { \
327 if (level <= ip_vs_get_debug_level()) \
328 printk(KERN_DEBUG \
329 pr_fmt("Leave: %s, %s line %i\n"), \
330 __func__, __FILE__, __LINE__); \
331 } while (0)
332 #else
333 #define EnterFunction(level) do {} while (0)
334 #define LeaveFunction(level) do {} while (0)
335 #endif
336
337
338 /*
339 * The port number of FTP service (in network order).
340 */
341 #define FTPPORT cpu_to_be16(21)
342 #define FTPDATA cpu_to_be16(20)
343
344 /*
345 * TCP State Values
346 */
347 enum {
348 IP_VS_TCP_S_NONE = 0,
349 IP_VS_TCP_S_ESTABLISHED,
350 IP_VS_TCP_S_SYN_SENT,
351 IP_VS_TCP_S_SYN_RECV,
352 IP_VS_TCP_S_FIN_WAIT,
353 IP_VS_TCP_S_TIME_WAIT,
354 IP_VS_TCP_S_CLOSE,
355 IP_VS_TCP_S_CLOSE_WAIT,
356 IP_VS_TCP_S_LAST_ACK,
357 IP_VS_TCP_S_LISTEN,
358 IP_VS_TCP_S_SYNACK,
359 IP_VS_TCP_S_LAST
360 };
361
362 /*
363 * UDP State Values
364 */
365 enum {
366 IP_VS_UDP_S_NORMAL,
367 IP_VS_UDP_S_LAST,
368 };
369
370 /*
371 * ICMP State Values
372 */
373 enum {
374 IP_VS_ICMP_S_NORMAL,
375 IP_VS_ICMP_S_LAST,
376 };
377
378 /*
379 * SCTP State Values
380 */
381 enum ip_vs_sctp_states {
382 IP_VS_SCTP_S_NONE,
383 IP_VS_SCTP_S_INIT1,
384 IP_VS_SCTP_S_INIT,
385 IP_VS_SCTP_S_COOKIE_SENT,
386 IP_VS_SCTP_S_COOKIE_REPLIED,
387 IP_VS_SCTP_S_COOKIE_WAIT,
388 IP_VS_SCTP_S_COOKIE,
389 IP_VS_SCTP_S_COOKIE_ECHOED,
390 IP_VS_SCTP_S_ESTABLISHED,
391 IP_VS_SCTP_S_SHUTDOWN_SENT,
392 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
393 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
394 IP_VS_SCTP_S_REJECTED,
395 IP_VS_SCTP_S_CLOSED,
396 IP_VS_SCTP_S_LAST
397 };
398
399 /*
400 * Delta sequence info structure
401 * Each ip_vs_conn has 2 (output AND input seq. changes).
402 * Only used in the VS/NAT.
403 */
404 struct ip_vs_seq {
405 __u32 init_seq; /* Add delta from this seq */
406 __u32 delta; /* Delta in sequence numbers */
407 __u32 previous_delta; /* Delta in sequence numbers
408 before last resized pkt */
409 };
410
411 /*
412 * counters per cpu
413 */
414 struct ip_vs_counters {
415 __u32 conns; /* connections scheduled */
416 __u32 inpkts; /* incoming packets */
417 __u32 outpkts; /* outgoing packets */
418 __u64 inbytes; /* incoming bytes */
419 __u64 outbytes; /* outgoing bytes */
420 };
421 /*
422 * Stats per cpu
423 */
424 struct ip_vs_cpu_stats {
425 struct ip_vs_counters ustats;
426 struct u64_stats_sync syncp;
427 };
428
429 /*
430 * IPVS statistics objects
431 */
432 struct ip_vs_estimator {
433 struct list_head list;
434
435 u64 last_inbytes;
436 u64 last_outbytes;
437 u32 last_conns;
438 u32 last_inpkts;
439 u32 last_outpkts;
440
441 u32 cps;
442 u32 inpps;
443 u32 outpps;
444 u32 inbps;
445 u32 outbps;
446 };
447
448 struct ip_vs_stats {
449 struct ip_vs_stats_user ustats; /* statistics */
450 struct ip_vs_estimator est; /* estimator */
451 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
452 spinlock_t lock; /* spin lock */
453 struct ip_vs_stats_user ustats0; /* reset values */
454 };
455
456 struct dst_entry;
457 struct iphdr;
458 struct ip_vs_conn;
459 struct ip_vs_app;
460 struct sk_buff;
461 struct ip_vs_proto_data;
462
463 struct ip_vs_protocol {
464 struct ip_vs_protocol *next;
465 char *name;
466 u16 protocol;
467 u16 num_states;
468 int dont_defrag;
469
470 void (*init)(struct ip_vs_protocol *pp);
471
472 void (*exit)(struct ip_vs_protocol *pp);
473
474 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
475
476 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
477
478 int (*conn_schedule)(int af, struct sk_buff *skb,
479 struct ip_vs_proto_data *pd,
480 int *verdict, struct ip_vs_conn **cpp,
481 struct ip_vs_iphdr *iph);
482
483 struct ip_vs_conn *
484 (*conn_in_get)(int af,
485 const struct sk_buff *skb,
486 const struct ip_vs_iphdr *iph,
487 int inverse);
488
489 struct ip_vs_conn *
490 (*conn_out_get)(int af,
491 const struct sk_buff *skb,
492 const struct ip_vs_iphdr *iph,
493 int inverse);
494
495 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
496 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
497
498 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
499 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
500
501 int (*csum_check)(int af, struct sk_buff *skb,
502 struct ip_vs_protocol *pp);
503
504 const char *(*state_name)(int state);
505
506 void (*state_transition)(struct ip_vs_conn *cp, int direction,
507 const struct sk_buff *skb,
508 struct ip_vs_proto_data *pd);
509
510 int (*register_app)(struct net *net, struct ip_vs_app *inc);
511
512 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
513
514 int (*app_conn_bind)(struct ip_vs_conn *cp);
515
516 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
517 const struct sk_buff *skb,
518 int offset,
519 const char *msg);
520
521 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
522 };
523
524 /*
525 * protocol data per netns
526 */
527 struct ip_vs_proto_data {
528 struct ip_vs_proto_data *next;
529 struct ip_vs_protocol *pp;
530 int *timeout_table; /* protocol timeout table */
531 atomic_t appcnt; /* counter of proto app incs. */
532 struct tcp_states_t *tcp_state_table;
533 };
534
535 extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
536 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
537 unsigned short proto);
538
539 struct ip_vs_conn_param {
540 struct net *net;
541 const union nf_inet_addr *caddr;
542 const union nf_inet_addr *vaddr;
543 __be16 cport;
544 __be16 vport;
545 __u16 protocol;
546 u16 af;
547
548 const struct ip_vs_pe *pe;
549 char *pe_data;
550 __u8 pe_data_len;
551 };
552
553 /*
554 * IP_VS structure allocated for each dynamically scheduled connection
555 */
556 struct ip_vs_conn {
557 struct hlist_node c_list; /* hashed list heads */
558 /* Protocol, addresses and port numbers */
559 __be16 cport;
560 __be16 dport;
561 __be16 vport;
562 u16 af; /* address family */
563 union nf_inet_addr caddr; /* client address */
564 union nf_inet_addr vaddr; /* virtual address */
565 union nf_inet_addr daddr; /* destination address */
566 volatile __u32 flags; /* status flags */
567 __u16 protocol; /* Which protocol (TCP/UDP) */
568 #ifdef CONFIG_NET_NS
569 struct net *net; /* Name space */
570 #endif
571
572 /* counter and timer */
573 atomic_t refcnt; /* reference count */
574 struct timer_list timer; /* Expiration timer */
575 volatile unsigned long timeout; /* timeout */
576
577 /* Flags and state transition */
578 spinlock_t lock; /* lock for state transition */
579 volatile __u16 state; /* state info */
580 volatile __u16 old_state; /* old state, to be used for
581 * state transition triggerd
582 * synchronization
583 */
584 __u32 fwmark; /* Fire wall mark from skb */
585 unsigned long sync_endtime; /* jiffies + sent_retries */
586
587 /* Control members */
588 struct ip_vs_conn *control; /* Master control connection */
589 atomic_t n_control; /* Number of controlled ones */
590 struct ip_vs_dest *dest; /* real server */
591 atomic_t in_pkts; /* incoming packet counter */
592
593 /* packet transmitter for different forwarding methods. If it
594 mangles the packet, it must return NF_DROP or better NF_STOLEN,
595 otherwise this must be changed to a sk_buff **.
596 NF_ACCEPT can be returned when destination is local.
597 */
598 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
599 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
600
601 /* Note: we can group the following members into a structure,
602 in order to save more space, and the following members are
603 only used in VS/NAT anyway */
604 struct ip_vs_app *app; /* bound ip_vs_app object */
605 void *app_data; /* Application private data */
606 struct ip_vs_seq in_seq; /* incoming seq. struct */
607 struct ip_vs_seq out_seq; /* outgoing seq. struct */
608
609 const struct ip_vs_pe *pe;
610 char *pe_data;
611 __u8 pe_data_len;
612
613 struct rcu_head rcu_head;
614 };
615
616 /*
617 * To save some memory in conn table when name space is disabled.
618 */
619 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
620 {
621 #ifdef CONFIG_NET_NS
622 return cp->net;
623 #else
624 return &init_net;
625 #endif
626 }
627 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
628 {
629 #ifdef CONFIG_NET_NS
630 cp->net = net;
631 #endif
632 }
633
634 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
635 struct net *net)
636 {
637 #ifdef CONFIG_NET_NS
638 return cp->net == net;
639 #else
640 return 1;
641 #endif
642 }
643
644 /*
645 * Extended internal versions of struct ip_vs_service_user and
646 * ip_vs_dest_user for IPv6 support.
647 *
648 * We need these to conveniently pass around service and destination
649 * options, but unfortunately, we also need to keep the old definitions to
650 * maintain userspace backwards compatibility for the setsockopt interface.
651 */
652 struct ip_vs_service_user_kern {
653 /* virtual service addresses */
654 u16 af;
655 u16 protocol;
656 union nf_inet_addr addr; /* virtual ip address */
657 __be16 port;
658 u32 fwmark; /* firwall mark of service */
659
660 /* virtual service options */
661 char *sched_name;
662 char *pe_name;
663 unsigned int flags; /* virtual service flags */
664 unsigned int timeout; /* persistent timeout in sec */
665 __be32 netmask; /* persistent netmask or plen */
666 };
667
668
669 struct ip_vs_dest_user_kern {
670 /* destination server address */
671 union nf_inet_addr addr;
672 __be16 port;
673
674 /* real server options */
675 unsigned int conn_flags; /* connection flags */
676 int weight; /* destination weight */
677
678 /* thresholds for active connections */
679 u32 u_threshold; /* upper threshold */
680 u32 l_threshold; /* lower threshold */
681 };
682
683
684 /*
685 * The information about the virtual service offered to the net
686 * and the forwarding entries
687 */
688 struct ip_vs_service {
689 struct hlist_node s_list; /* for normal service table */
690 struct hlist_node f_list; /* for fwmark-based service table */
691 atomic_t refcnt; /* reference counter */
692
693 u16 af; /* address family */
694 __u16 protocol; /* which protocol (TCP/UDP) */
695 union nf_inet_addr addr; /* IP address for virtual service */
696 __be16 port; /* port number for the service */
697 __u32 fwmark; /* firewall mark of the service */
698 unsigned int flags; /* service status flags */
699 unsigned int timeout; /* persistent timeout in ticks */
700 __be32 netmask; /* grouping granularity, mask/plen */
701 struct net *net;
702
703 struct list_head destinations; /* real server d-linked list */
704 __u32 num_dests; /* number of servers */
705 struct ip_vs_stats stats; /* statistics for the service */
706
707 /* for scheduling */
708 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
709 spinlock_t sched_lock; /* lock sched_data */
710 void *sched_data; /* scheduler application data */
711
712 /* alternate persistence engine */
713 struct ip_vs_pe __rcu *pe;
714
715 struct rcu_head rcu_head;
716 };
717
718 /* Information for cached dst */
719 struct ip_vs_dest_dst {
720 struct dst_entry *dst_cache; /* destination cache entry */
721 u32 dst_cookie;
722 union nf_inet_addr dst_saddr;
723 struct rcu_head rcu_head;
724 };
725
726 /* In grace period after removing */
727 #define IP_VS_DEST_STATE_REMOVING 0x01
728 /*
729 * The real server destination forwarding entry
730 * with ip address, port number, and so on.
731 */
732 struct ip_vs_dest {
733 struct list_head n_list; /* for the dests in the service */
734 struct hlist_node d_list; /* for table with all the dests */
735
736 u16 af; /* address family */
737 __be16 port; /* port number of the server */
738 union nf_inet_addr addr; /* IP address of the server */
739 volatile unsigned int flags; /* dest status flags */
740 atomic_t conn_flags; /* flags to copy to conn */
741 atomic_t weight; /* server weight */
742
743 atomic_t refcnt; /* reference counter */
744 struct ip_vs_stats stats; /* statistics */
745 unsigned long state; /* state flags */
746
747 /* connection counters and thresholds */
748 atomic_t activeconns; /* active connections */
749 atomic_t inactconns; /* inactive connections */
750 atomic_t persistconns; /* persistent connections */
751 __u32 u_threshold; /* upper threshold */
752 __u32 l_threshold; /* lower threshold */
753
754 /* for destination cache */
755 spinlock_t dst_lock; /* lock of dst_cache */
756 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
757
758 /* for virtual service */
759 struct ip_vs_service *svc; /* service it belongs to */
760 __u16 protocol; /* which protocol (TCP/UDP) */
761 __be16 vport; /* virtual port number */
762 union nf_inet_addr vaddr; /* virtual IP address */
763 __u32 vfwmark; /* firewall mark of service */
764
765 struct list_head t_list; /* in dest_trash */
766 struct rcu_head rcu_head;
767 unsigned int in_rs_table:1; /* we are in rs_table */
768 };
769
770
771 /*
772 * The scheduler object
773 */
774 struct ip_vs_scheduler {
775 struct list_head n_list; /* d-linked list head */
776 char *name; /* scheduler name */
777 atomic_t refcnt; /* reference counter */
778 struct module *module; /* THIS_MODULE/NULL */
779
780 /* scheduler initializing service */
781 int (*init_service)(struct ip_vs_service *svc);
782 /* scheduling service finish */
783 void (*done_service)(struct ip_vs_service *svc);
784 /* dest is linked */
785 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
786 /* dest is unlinked */
787 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
788 /* dest is updated */
789 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
790
791 /* selecting a server from the given service */
792 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
793 const struct sk_buff *skb,
794 struct ip_vs_iphdr *iph);
795 };
796
797 /* The persistence engine object */
798 struct ip_vs_pe {
799 struct list_head n_list; /* d-linked list head */
800 char *name; /* scheduler name */
801 atomic_t refcnt; /* reference counter */
802 struct module *module; /* THIS_MODULE/NULL */
803
804 /* get the connection template, if any */
805 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
806 bool (*ct_match)(const struct ip_vs_conn_param *p,
807 struct ip_vs_conn *ct);
808 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
809 bool inverse);
810 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
811 };
812
813 /*
814 * The application module object (a.k.a. app incarnation)
815 */
816 struct ip_vs_app {
817 struct list_head a_list; /* member in app list */
818 int type; /* IP_VS_APP_TYPE_xxx */
819 char *name; /* application module name */
820 __u16 protocol;
821 struct module *module; /* THIS_MODULE/NULL */
822 struct list_head incs_list; /* list of incarnations */
823
824 /* members for application incarnations */
825 struct list_head p_list; /* member in proto app list */
826 struct ip_vs_app *app; /* its real application */
827 __be16 port; /* port number in net order */
828 atomic_t usecnt; /* usage counter */
829 struct rcu_head rcu_head;
830
831 /*
832 * output hook: Process packet in inout direction, diff set for TCP.
833 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
834 * 2=Mangled but checksum was not updated
835 */
836 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
837 struct sk_buff *, int *diff);
838
839 /*
840 * input hook: Process packet in outin direction, diff set for TCP.
841 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
842 * 2=Mangled but checksum was not updated
843 */
844 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
845 struct sk_buff *, int *diff);
846
847 /* ip_vs_app initializer */
848 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
849
850 /* ip_vs_app finish */
851 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
852
853
854 /* not used now */
855 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
856 struct ip_vs_protocol *);
857
858 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
859
860 int * timeout_table;
861 int * timeouts;
862 int timeouts_size;
863
864 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
865 int *verdict, struct ip_vs_conn **cpp);
866
867 struct ip_vs_conn *
868 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
869 const struct iphdr *iph, int inverse);
870
871 struct ip_vs_conn *
872 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
873 const struct iphdr *iph, int inverse);
874
875 int (*state_transition)(struct ip_vs_conn *cp, int direction,
876 const struct sk_buff *skb,
877 struct ip_vs_app *app);
878
879 void (*timeout_change)(struct ip_vs_app *app, int flags);
880 };
881
882 struct ipvs_master_sync_state {
883 struct list_head sync_queue;
884 struct ip_vs_sync_buff *sync_buff;
885 unsigned long sync_queue_len;
886 unsigned int sync_queue_delay;
887 struct task_struct *master_thread;
888 struct delayed_work master_wakeup_work;
889 struct netns_ipvs *ipvs;
890 };
891
892 /* How much time to keep dests in trash */
893 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
894
895 /* IPVS in network namespace */
896 struct netns_ipvs {
897 int gen; /* Generation */
898 int enable; /* enable like nf_hooks do */
899 /*
900 * Hash table: for real service lookups
901 */
902 #define IP_VS_RTAB_BITS 4
903 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
904 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
905
906 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
907 /* ip_vs_app */
908 struct list_head app_list;
909 /* ip_vs_proto */
910 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
911 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
912 /* ip_vs_proto_tcp */
913 #ifdef CONFIG_IP_VS_PROTO_TCP
914 #define TCP_APP_TAB_BITS 4
915 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
916 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
917 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
918 #endif
919 /* ip_vs_proto_udp */
920 #ifdef CONFIG_IP_VS_PROTO_UDP
921 #define UDP_APP_TAB_BITS 4
922 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
923 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
924 struct list_head udp_apps[UDP_APP_TAB_SIZE];
925 #endif
926 /* ip_vs_proto_sctp */
927 #ifdef CONFIG_IP_VS_PROTO_SCTP
928 #define SCTP_APP_TAB_BITS 4
929 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
930 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
931 /* Hash table for SCTP application incarnations */
932 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
933 #endif
934 /* ip_vs_conn */
935 atomic_t conn_count; /* connection counter */
936
937 /* ip_vs_ctl */
938 struct ip_vs_stats tot_stats; /* Statistics & est. */
939
940 int num_services; /* no of virtual services */
941
942 /* Trash for destinations */
943 struct list_head dest_trash;
944 spinlock_t dest_trash_lock;
945 struct timer_list dest_trash_timer; /* expiration timer */
946 /* Service counters */
947 atomic_t ftpsvc_counter;
948 atomic_t nullsvc_counter;
949
950 #ifdef CONFIG_SYSCTL
951 /* 1/rate drop and drop-entry variables */
952 struct delayed_work defense_work; /* Work handler */
953 int drop_rate;
954 int drop_counter;
955 atomic_t dropentry;
956 /* locks in ctl.c */
957 spinlock_t dropentry_lock; /* drop entry handling */
958 spinlock_t droppacket_lock; /* drop packet handling */
959 spinlock_t securetcp_lock; /* state and timeout tables */
960
961 /* sys-ctl struct */
962 struct ctl_table_header *sysctl_hdr;
963 struct ctl_table *sysctl_tbl;
964 #endif
965
966 /* sysctl variables */
967 int sysctl_amemthresh;
968 int sysctl_am_droprate;
969 int sysctl_drop_entry;
970 int sysctl_drop_packet;
971 int sysctl_secure_tcp;
972 #ifdef CONFIG_IP_VS_NFCT
973 int sysctl_conntrack;
974 #endif
975 int sysctl_snat_reroute;
976 int sysctl_sync_ver;
977 int sysctl_sync_ports;
978 int sysctl_sync_persist_mode;
979 unsigned long sysctl_sync_qlen_max;
980 int sysctl_sync_sock_size;
981 int sysctl_cache_bypass;
982 int sysctl_expire_nodest_conn;
983 int sysctl_sloppy_tcp;
984 int sysctl_sloppy_sctp;
985 int sysctl_expire_quiescent_template;
986 int sysctl_sync_threshold[2];
987 unsigned int sysctl_sync_refresh_period;
988 int sysctl_sync_retries;
989 int sysctl_nat_icmp_send;
990 int sysctl_pmtu_disc;
991 int sysctl_backup_only;
992
993 /* ip_vs_lblc */
994 int sysctl_lblc_expiration;
995 struct ctl_table_header *lblc_ctl_header;
996 struct ctl_table *lblc_ctl_table;
997 /* ip_vs_lblcr */
998 int sysctl_lblcr_expiration;
999 struct ctl_table_header *lblcr_ctl_header;
1000 struct ctl_table *lblcr_ctl_table;
1001 /* ip_vs_est */
1002 struct list_head est_list; /* estimator list */
1003 spinlock_t est_lock;
1004 struct timer_list est_timer; /* Estimation timer */
1005 /* ip_vs_sync */
1006 spinlock_t sync_lock;
1007 struct ipvs_master_sync_state *ms;
1008 spinlock_t sync_buff_lock;
1009 struct task_struct **backup_threads;
1010 int threads_mask;
1011 int send_mesg_maxlen;
1012 int recv_mesg_maxlen;
1013 volatile int sync_state;
1014 volatile int master_syncid;
1015 volatile int backup_syncid;
1016 struct mutex sync_mutex;
1017 /* multicast interface name */
1018 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
1019 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
1020 /* net name space ptr */
1021 struct net *net; /* Needed by timer routines */
1022 };
1023
1024 #define DEFAULT_SYNC_THRESHOLD 3
1025 #define DEFAULT_SYNC_PERIOD 50
1026 #define DEFAULT_SYNC_VER 1
1027 #define DEFAULT_SLOPPY_TCP 0
1028 #define DEFAULT_SLOPPY_SCTP 0
1029 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
1030 #define DEFAULT_SYNC_RETRIES 0
1031 #define IPVS_SYNC_WAKEUP_RATE 8
1032 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1033 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
1034 #define IPVS_SYNC_CHECK_PERIOD HZ
1035 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1036 #define IPVS_SYNC_PORTS_MAX (1 << 6)
1037
1038 #ifdef CONFIG_SYSCTL
1039
1040 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1041 {
1042 return ipvs->sysctl_sync_threshold[0];
1043 }
1044
1045 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1046 {
1047 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1048 }
1049
1050 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1051 {
1052 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1053 }
1054
1055 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1056 {
1057 return ipvs->sysctl_sync_retries;
1058 }
1059
1060 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1061 {
1062 return ipvs->sysctl_sync_ver;
1063 }
1064
1065 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1066 {
1067 return ipvs->sysctl_sloppy_tcp;
1068 }
1069
1070 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1071 {
1072 return ipvs->sysctl_sloppy_sctp;
1073 }
1074
1075 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1076 {
1077 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1078 }
1079
1080 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1081 {
1082 return ipvs->sysctl_sync_persist_mode;
1083 }
1084
1085 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1086 {
1087 return ipvs->sysctl_sync_qlen_max;
1088 }
1089
1090 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1091 {
1092 return ipvs->sysctl_sync_sock_size;
1093 }
1094
1095 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1096 {
1097 return ipvs->sysctl_pmtu_disc;
1098 }
1099
1100 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1101 {
1102 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1103 ipvs->sysctl_backup_only;
1104 }
1105
1106 #else
1107
1108 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1109 {
1110 return DEFAULT_SYNC_THRESHOLD;
1111 }
1112
1113 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1114 {
1115 return DEFAULT_SYNC_PERIOD;
1116 }
1117
1118 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1119 {
1120 return DEFAULT_SYNC_REFRESH_PERIOD;
1121 }
1122
1123 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1124 {
1125 return DEFAULT_SYNC_RETRIES & 3;
1126 }
1127
1128 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1129 {
1130 return DEFAULT_SYNC_VER;
1131 }
1132
1133 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1134 {
1135 return DEFAULT_SLOPPY_TCP;
1136 }
1137
1138 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1139 {
1140 return DEFAULT_SLOPPY_SCTP;
1141 }
1142
1143 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1144 {
1145 return 1;
1146 }
1147
1148 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1149 {
1150 return 0;
1151 }
1152
1153 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1154 {
1155 return IPVS_SYNC_QLEN_MAX;
1156 }
1157
1158 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1159 {
1160 return 0;
1161 }
1162
1163 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1164 {
1165 return 1;
1166 }
1167
1168 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1169 {
1170 return 0;
1171 }
1172
1173 #endif
1174
1175 /*
1176 * IPVS core functions
1177 * (from ip_vs_core.c)
1178 */
1179 extern const char *ip_vs_proto_name(unsigned int proto);
1180 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
1181 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1182
1183 #define IP_VS_APP_TYPE_FTP 1
1184
1185 /*
1186 * ip_vs_conn handling functions
1187 * (from ip_vs_conn.c)
1188 */
1189
1190 enum {
1191 IP_VS_DIR_INPUT = 0,
1192 IP_VS_DIR_OUTPUT,
1193 IP_VS_DIR_INPUT_ONLY,
1194 IP_VS_DIR_LAST,
1195 };
1196
1197 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1198 const union nf_inet_addr *caddr,
1199 __be16 cport,
1200 const union nf_inet_addr *vaddr,
1201 __be16 vport,
1202 struct ip_vs_conn_param *p)
1203 {
1204 p->net = net;
1205 p->af = af;
1206 p->protocol = protocol;
1207 p->caddr = caddr;
1208 p->cport = cport;
1209 p->vaddr = vaddr;
1210 p->vport = vport;
1211 p->pe = NULL;
1212 p->pe_data = NULL;
1213 }
1214
1215 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1216 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1217
1218 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1219 const struct ip_vs_iphdr *iph,
1220 int inverse);
1221
1222 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1223
1224 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1225 const struct ip_vs_iphdr *iph,
1226 int inverse);
1227
1228 /* Get reference to gain full access to conn.
1229 * By default, RCU read-side critical sections have access only to
1230 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1231 */
1232 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1233 {
1234 return atomic_inc_not_zero(&cp->refcnt);
1235 }
1236
1237 /* put back the conn without restarting its timer */
1238 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1239 {
1240 smp_mb__before_atomic_dec();
1241 atomic_dec(&cp->refcnt);
1242 }
1243 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1244 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1245
1246 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1247 const union nf_inet_addr *daddr,
1248 __be16 dport, unsigned int flags,
1249 struct ip_vs_dest *dest, __u32 fwmark);
1250 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1251
1252 extern const char * ip_vs_state_name(__u16 proto, int state);
1253
1254 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1255 extern int ip_vs_check_template(struct ip_vs_conn *ct);
1256 extern void ip_vs_random_dropentry(struct net *net);
1257 extern int ip_vs_conn_init(void);
1258 extern void ip_vs_conn_cleanup(void);
1259
1260 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1261 {
1262 struct ip_vs_conn *ctl_cp = cp->control;
1263 if (!ctl_cp) {
1264 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1265 "%s:%d to %s:%d\n",
1266 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1267 ntohs(cp->cport),
1268 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1269 ntohs(cp->vport));
1270
1271 return;
1272 }
1273
1274 IP_VS_DBG_BUF(7, "DELeting control for: "
1275 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1276 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1277 ntohs(cp->cport),
1278 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1279 ntohs(ctl_cp->cport));
1280
1281 cp->control = NULL;
1282 if (atomic_read(&ctl_cp->n_control) == 0) {
1283 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
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 return;
1291 }
1292 atomic_dec(&ctl_cp->n_control);
1293 }
1294
1295 static inline void
1296 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1297 {
1298 if (cp->control) {
1299 IP_VS_ERR_BUF("request control ADD for already controlled: "
1300 "%s:%d to %s:%d\n",
1301 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1302 ntohs(cp->cport),
1303 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1304 ntohs(cp->vport));
1305
1306 ip_vs_control_del(cp);
1307 }
1308
1309 IP_VS_DBG_BUF(7, "ADDing control for: "
1310 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1311 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1312 ntohs(cp->cport),
1313 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1314 ntohs(ctl_cp->cport));
1315
1316 cp->control = ctl_cp;
1317 atomic_inc(&ctl_cp->n_control);
1318 }
1319
1320 /*
1321 * IPVS netns init & cleanup functions
1322 */
1323 extern int ip_vs_estimator_net_init(struct net *net);
1324 extern int ip_vs_control_net_init(struct net *net);
1325 extern int ip_vs_protocol_net_init(struct net *net);
1326 extern int ip_vs_app_net_init(struct net *net);
1327 extern int ip_vs_conn_net_init(struct net *net);
1328 extern int ip_vs_sync_net_init(struct net *net);
1329 extern void ip_vs_conn_net_cleanup(struct net *net);
1330 extern void ip_vs_app_net_cleanup(struct net *net);
1331 extern void ip_vs_protocol_net_cleanup(struct net *net);
1332 extern void ip_vs_control_net_cleanup(struct net *net);
1333 extern void ip_vs_estimator_net_cleanup(struct net *net);
1334 extern void ip_vs_sync_net_cleanup(struct net *net);
1335 extern void ip_vs_service_net_cleanup(struct net *net);
1336
1337 /*
1338 * IPVS application functions
1339 * (from ip_vs_app.c)
1340 */
1341 #define IP_VS_APP_MAX_PORTS 8
1342 extern struct ip_vs_app *register_ip_vs_app(struct net *net,
1343 struct ip_vs_app *app);
1344 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1345 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1346 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1347 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1348 __u16 proto, __u16 port);
1349 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1350 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1351
1352 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1353 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1354
1355 int register_ip_vs_pe(struct ip_vs_pe *pe);
1356 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1357 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1358 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1359
1360 /*
1361 * Use a #define to avoid all of module.h just for these trivial ops
1362 */
1363 #define ip_vs_pe_get(pe) \
1364 if (pe && pe->module) \
1365 __module_get(pe->module);
1366
1367 #define ip_vs_pe_put(pe) \
1368 if (pe && pe->module) \
1369 module_put(pe->module);
1370
1371 /*
1372 * IPVS protocol functions (from ip_vs_proto.c)
1373 */
1374 extern int ip_vs_protocol_init(void);
1375 extern void ip_vs_protocol_cleanup(void);
1376 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1377 extern int *ip_vs_create_timeout_table(int *table, int size);
1378 extern int
1379 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1380 const char *name, int to);
1381 extern void
1382 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1383 const struct sk_buff *skb,
1384 int offset, const char *msg);
1385
1386 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1387 extern struct ip_vs_protocol ip_vs_protocol_udp;
1388 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1389 extern struct ip_vs_protocol ip_vs_protocol_esp;
1390 extern struct ip_vs_protocol ip_vs_protocol_ah;
1391 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1392
1393 /*
1394 * Registering/unregistering scheduler functions
1395 * (from ip_vs_sched.c)
1396 */
1397 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1398 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1399 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1400 struct ip_vs_scheduler *scheduler);
1401 extern void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1402 struct ip_vs_scheduler *sched);
1403 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1404 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1405 extern struct ip_vs_conn *
1406 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1407 struct ip_vs_proto_data *pd, int *ignored,
1408 struct ip_vs_iphdr *iph);
1409 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1410 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1411
1412 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1413
1414
1415 /*
1416 * IPVS control data and functions (from ip_vs_ctl.c)
1417 */
1418 extern struct ip_vs_stats ip_vs_stats;
1419 extern int sysctl_ip_vs_sync_ver;
1420
1421 extern struct ip_vs_service *
1422 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1423 const union nf_inet_addr *vaddr, __be16 vport);
1424
1425 extern bool
1426 ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1427 const union nf_inet_addr *daddr, __be16 dport);
1428
1429 extern int ip_vs_use_count_inc(void);
1430 extern void ip_vs_use_count_dec(void);
1431 extern int ip_vs_register_nl_ioctl(void);
1432 extern void ip_vs_unregister_nl_ioctl(void);
1433 extern int ip_vs_control_init(void);
1434 extern void ip_vs_control_cleanup(void);
1435 extern struct ip_vs_dest *
1436 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1437 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1438 __u16 protocol, __u32 fwmark, __u32 flags);
1439 extern void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1440
1441 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1442 {
1443 atomic_inc(&dest->refcnt);
1444 }
1445
1446 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1447 {
1448 smp_mb__before_atomic_dec();
1449 atomic_dec(&dest->refcnt);
1450 }
1451
1452 /*
1453 * IPVS sync daemon data and function prototypes
1454 * (from ip_vs_sync.c)
1455 */
1456 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1457 __u8 syncid);
1458 extern int stop_sync_thread(struct net *net, int state);
1459 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1460
1461
1462 /*
1463 * IPVS rate estimator prototypes (from ip_vs_est.c)
1464 */
1465 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1466 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1467 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1468 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1469 struct ip_vs_stats *stats);
1470
1471 /*
1472 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1473 */
1474 extern int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1475 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1476 extern int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1477 struct ip_vs_protocol *pp,
1478 struct ip_vs_iphdr *iph);
1479 extern int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481 extern int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp,
1483 struct ip_vs_iphdr *iph);
1484 extern int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1485 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1486 extern int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1487 struct ip_vs_protocol *pp, int offset,
1488 unsigned int hooknum, struct ip_vs_iphdr *iph);
1489 extern void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1490
1491 #ifdef CONFIG_IP_VS_IPV6
1492 extern int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1493 struct ip_vs_protocol *pp,
1494 struct ip_vs_iphdr *iph);
1495 extern int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1496 struct ip_vs_protocol *pp,
1497 struct ip_vs_iphdr *iph);
1498 extern int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1499 struct ip_vs_protocol *pp,
1500 struct ip_vs_iphdr *iph);
1501 extern int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1502 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1503 extern int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1504 struct ip_vs_protocol *pp, int offset,
1505 unsigned int hooknum, struct ip_vs_iphdr *iph);
1506 #endif
1507
1508 #ifdef CONFIG_SYSCTL
1509 /*
1510 * This is a simple mechanism to ignore packets when
1511 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1512 * we start to drop 1/rate of the packets
1513 */
1514
1515 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1516 {
1517 if (!ipvs->drop_rate)
1518 return 0;
1519 if (--ipvs->drop_counter > 0)
1520 return 0;
1521 ipvs->drop_counter = ipvs->drop_rate;
1522 return 1;
1523 }
1524 #else
1525 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1526 #endif
1527
1528 /*
1529 * ip_vs_fwd_tag returns the forwarding tag of the connection
1530 */
1531 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1532
1533 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1534 {
1535 char fwd;
1536
1537 switch (IP_VS_FWD_METHOD(cp)) {
1538 case IP_VS_CONN_F_MASQ:
1539 fwd = 'M'; break;
1540 case IP_VS_CONN_F_LOCALNODE:
1541 fwd = 'L'; break;
1542 case IP_VS_CONN_F_TUNNEL:
1543 fwd = 'T'; break;
1544 case IP_VS_CONN_F_DROUTE:
1545 fwd = 'R'; break;
1546 case IP_VS_CONN_F_BYPASS:
1547 fwd = 'B'; break;
1548 default:
1549 fwd = '?'; break;
1550 }
1551 return fwd;
1552 }
1553
1554 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1555 struct ip_vs_conn *cp, int dir);
1556
1557 #ifdef CONFIG_IP_VS_IPV6
1558 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1559 struct ip_vs_conn *cp, int dir);
1560 #endif
1561
1562 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1563
1564 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1565 {
1566 __be32 diff[2] = { ~old, new };
1567
1568 return csum_partial(diff, sizeof(diff), oldsum);
1569 }
1570
1571 #ifdef CONFIG_IP_VS_IPV6
1572 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1573 __wsum oldsum)
1574 {
1575 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1576 new[3], new[2], new[1], new[0] };
1577
1578 return csum_partial(diff, sizeof(diff), oldsum);
1579 }
1580 #endif
1581
1582 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1583 {
1584 __be16 diff[2] = { ~old, new };
1585
1586 return csum_partial(diff, sizeof(diff), oldsum);
1587 }
1588
1589 /*
1590 * Forget current conntrack (unconfirmed) and attach notrack entry
1591 */
1592 static inline void ip_vs_notrack(struct sk_buff *skb)
1593 {
1594 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1595 enum ip_conntrack_info ctinfo;
1596 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1597
1598 if (!ct || !nf_ct_is_untracked(ct)) {
1599 nf_conntrack_put(skb->nfct);
1600 skb->nfct = &nf_ct_untracked_get()->ct_general;
1601 skb->nfctinfo = IP_CT_NEW;
1602 nf_conntrack_get(skb->nfct);
1603 }
1604 #endif
1605 }
1606
1607 #ifdef CONFIG_IP_VS_NFCT
1608 /*
1609 * Netfilter connection tracking
1610 * (from ip_vs_nfct.c)
1611 */
1612 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1613 {
1614 #ifdef CONFIG_SYSCTL
1615 return ipvs->sysctl_conntrack;
1616 #else
1617 return 0;
1618 #endif
1619 }
1620
1621 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1622 int outin);
1623 extern int ip_vs_confirm_conntrack(struct sk_buff *skb);
1624 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1625 struct ip_vs_conn *cp, u_int8_t proto,
1626 const __be16 port, int from_rs);
1627 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1628
1629 #else
1630
1631 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1632 {
1633 return 0;
1634 }
1635
1636 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1637 struct ip_vs_conn *cp, int outin)
1638 {
1639 }
1640
1641 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1642 {
1643 return NF_ACCEPT;
1644 }
1645
1646 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1647 {
1648 }
1649 /* CONFIG_IP_VS_NFCT */
1650 #endif
1651
1652 static inline unsigned int
1653 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1654 {
1655 /*
1656 * We think the overhead of processing active connections is 256
1657 * times higher than that of inactive connections in average. (This
1658 * 256 times might not be accurate, we will change it later) We
1659 * use the following formula to estimate the overhead now:
1660 * dest->activeconns*256 + dest->inactconns
1661 */
1662 return (atomic_read(&dest->activeconns) << 8) +
1663 atomic_read(&dest->inactconns);
1664 }
1665
1666 #endif /* _NET_IP_VS_H */
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