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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net
[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 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
113 __s16 protocol;
114 __s32 flags;
115 union nf_inet_addr saddr;
116 union nf_inet_addr daddr;
117 };
118
119 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
120 int len, void *buffer,
121 const struct ip_vs_iphdr *ipvsh)
122 {
123 return skb_header_pointer(skb, offset, len, buffer);
124 }
125
126 static inline void
127 ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
128 {
129 const struct iphdr *iph = nh;
130
131 iphdr->len = iph->ihl * 4;
132 iphdr->fragoffs = 0;
133 iphdr->protocol = iph->protocol;
134 iphdr->saddr.ip = iph->saddr;
135 iphdr->daddr.ip = iph->daddr;
136 }
137
138 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
139 * IPv6 requires some extra work, as finding proper header position,
140 * depend on the IPv6 extension headers.
141 */
142 static inline void
143 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
144 {
145 #ifdef CONFIG_IP_VS_IPV6
146 if (af == AF_INET6) {
147 const struct ipv6hdr *iph =
148 (struct ipv6hdr *)skb_network_header(skb);
149 iphdr->saddr.in6 = iph->saddr;
150 iphdr->daddr.in6 = iph->daddr;
151 /* ipv6_find_hdr() updates len, flags */
152 iphdr->len = 0;
153 iphdr->flags = 0;
154 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
155 &iphdr->fragoffs,
156 &iphdr->flags);
157 } else
158 #endif
159 {
160 const struct iphdr *iph =
161 (struct iphdr *)skb_network_header(skb);
162 iphdr->len = iph->ihl * 4;
163 iphdr->fragoffs = 0;
164 iphdr->protocol = iph->protocol;
165 iphdr->saddr.ip = iph->saddr;
166 iphdr->daddr.ip = iph->daddr;
167 }
168 }
169
170 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
171 const union nf_inet_addr *src)
172 {
173 #ifdef CONFIG_IP_VS_IPV6
174 if (af == AF_INET6)
175 dst->in6 = src->in6;
176 else
177 #endif
178 dst->ip = src->ip;
179 }
180
181 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
182 const union nf_inet_addr *src)
183 {
184 #ifdef CONFIG_IP_VS_IPV6
185 if (af == AF_INET6) {
186 dst->in6 = src->in6;
187 return;
188 }
189 #endif
190 dst->ip = src->ip;
191 dst->all[1] = 0;
192 dst->all[2] = 0;
193 dst->all[3] = 0;
194 }
195
196 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
197 const union nf_inet_addr *b)
198 {
199 #ifdef CONFIG_IP_VS_IPV6
200 if (af == AF_INET6)
201 return ipv6_addr_equal(&a->in6, &b->in6);
202 #endif
203 return a->ip == b->ip;
204 }
205
206 #ifdef CONFIG_IP_VS_DEBUG
207 #include <linux/net.h>
208
209 int ip_vs_get_debug_level(void);
210
211 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
212 const union nf_inet_addr *addr,
213 int *idx)
214 {
215 int len;
216 #ifdef CONFIG_IP_VS_IPV6
217 if (af == AF_INET6)
218 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
219 &addr->in6) + 1;
220 else
221 #endif
222 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
223 &addr->ip) + 1;
224
225 *idx += len;
226 BUG_ON(*idx > buf_len + 1);
227 return &buf[*idx - len];
228 }
229
230 #define IP_VS_DBG_BUF(level, msg, ...) \
231 do { \
232 char ip_vs_dbg_buf[160]; \
233 int ip_vs_dbg_idx = 0; \
234 if (level <= ip_vs_get_debug_level()) \
235 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
236 } while (0)
237 #define IP_VS_ERR_BUF(msg...) \
238 do { \
239 char ip_vs_dbg_buf[160]; \
240 int ip_vs_dbg_idx = 0; \
241 pr_err(msg); \
242 } while (0)
243
244 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
245 #define IP_VS_DBG_ADDR(af, addr) \
246 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
247 sizeof(ip_vs_dbg_buf), addr, \
248 &ip_vs_dbg_idx)
249
250 #define IP_VS_DBG(level, msg, ...) \
251 do { \
252 if (level <= ip_vs_get_debug_level()) \
253 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
254 } while (0)
255 #define IP_VS_DBG_RL(msg, ...) \
256 do { \
257 if (net_ratelimit()) \
258 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
259 } while (0)
260 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
261 do { \
262 if (level <= ip_vs_get_debug_level()) \
263 pp->debug_packet(af, pp, skb, ofs, msg); \
264 } while (0)
265 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
266 do { \
267 if (level <= ip_vs_get_debug_level() && \
268 net_ratelimit()) \
269 pp->debug_packet(af, pp, skb, ofs, msg); \
270 } while (0)
271 #else /* NO DEBUGGING at ALL */
272 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
273 #define IP_VS_ERR_BUF(msg...) do {} while (0)
274 #define IP_VS_DBG(level, msg...) do {} while (0)
275 #define IP_VS_DBG_RL(msg...) do {} while (0)
276 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
277 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
278 #endif
279
280 #define IP_VS_BUG() BUG()
281 #define IP_VS_ERR_RL(msg, ...) \
282 do { \
283 if (net_ratelimit()) \
284 pr_err(msg, ##__VA_ARGS__); \
285 } while (0)
286
287 #ifdef CONFIG_IP_VS_DEBUG
288 #define EnterFunction(level) \
289 do { \
290 if (level <= ip_vs_get_debug_level()) \
291 printk(KERN_DEBUG \
292 pr_fmt("Enter: %s, %s line %i\n"), \
293 __func__, __FILE__, __LINE__); \
294 } while (0)
295 #define LeaveFunction(level) \
296 do { \
297 if (level <= ip_vs_get_debug_level()) \
298 printk(KERN_DEBUG \
299 pr_fmt("Leave: %s, %s line %i\n"), \
300 __func__, __FILE__, __LINE__); \
301 } while (0)
302 #else
303 #define EnterFunction(level) do {} while (0)
304 #define LeaveFunction(level) do {} while (0)
305 #endif
306
307
308 /*
309 * The port number of FTP service (in network order).
310 */
311 #define FTPPORT cpu_to_be16(21)
312 #define FTPDATA cpu_to_be16(20)
313
314 /*
315 * TCP State Values
316 */
317 enum {
318 IP_VS_TCP_S_NONE = 0,
319 IP_VS_TCP_S_ESTABLISHED,
320 IP_VS_TCP_S_SYN_SENT,
321 IP_VS_TCP_S_SYN_RECV,
322 IP_VS_TCP_S_FIN_WAIT,
323 IP_VS_TCP_S_TIME_WAIT,
324 IP_VS_TCP_S_CLOSE,
325 IP_VS_TCP_S_CLOSE_WAIT,
326 IP_VS_TCP_S_LAST_ACK,
327 IP_VS_TCP_S_LISTEN,
328 IP_VS_TCP_S_SYNACK,
329 IP_VS_TCP_S_LAST
330 };
331
332 /*
333 * UDP State Values
334 */
335 enum {
336 IP_VS_UDP_S_NORMAL,
337 IP_VS_UDP_S_LAST,
338 };
339
340 /*
341 * ICMP State Values
342 */
343 enum {
344 IP_VS_ICMP_S_NORMAL,
345 IP_VS_ICMP_S_LAST,
346 };
347
348 /*
349 * SCTP State Values
350 */
351 enum ip_vs_sctp_states {
352 IP_VS_SCTP_S_NONE,
353 IP_VS_SCTP_S_INIT1,
354 IP_VS_SCTP_S_INIT,
355 IP_VS_SCTP_S_COOKIE_SENT,
356 IP_VS_SCTP_S_COOKIE_REPLIED,
357 IP_VS_SCTP_S_COOKIE_WAIT,
358 IP_VS_SCTP_S_COOKIE,
359 IP_VS_SCTP_S_COOKIE_ECHOED,
360 IP_VS_SCTP_S_ESTABLISHED,
361 IP_VS_SCTP_S_SHUTDOWN_SENT,
362 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
363 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
364 IP_VS_SCTP_S_REJECTED,
365 IP_VS_SCTP_S_CLOSED,
366 IP_VS_SCTP_S_LAST
367 };
368
369 /*
370 * Delta sequence info structure
371 * Each ip_vs_conn has 2 (output AND input seq. changes).
372 * Only used in the VS/NAT.
373 */
374 struct ip_vs_seq {
375 __u32 init_seq; /* Add delta from this seq */
376 __u32 delta; /* Delta in sequence numbers */
377 __u32 previous_delta; /* Delta in sequence numbers
378 before last resized pkt */
379 };
380
381 /*
382 * counters per cpu
383 */
384 struct ip_vs_counters {
385 __u32 conns; /* connections scheduled */
386 __u32 inpkts; /* incoming packets */
387 __u32 outpkts; /* outgoing packets */
388 __u64 inbytes; /* incoming bytes */
389 __u64 outbytes; /* outgoing bytes */
390 };
391 /*
392 * Stats per cpu
393 */
394 struct ip_vs_cpu_stats {
395 struct ip_vs_counters ustats;
396 struct u64_stats_sync syncp;
397 };
398
399 /*
400 * IPVS statistics objects
401 */
402 struct ip_vs_estimator {
403 struct list_head list;
404
405 u64 last_inbytes;
406 u64 last_outbytes;
407 u32 last_conns;
408 u32 last_inpkts;
409 u32 last_outpkts;
410
411 u32 cps;
412 u32 inpps;
413 u32 outpps;
414 u32 inbps;
415 u32 outbps;
416 };
417
418 struct ip_vs_stats {
419 struct ip_vs_stats_user ustats; /* statistics */
420 struct ip_vs_estimator est; /* estimator */
421 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
422 spinlock_t lock; /* spin lock */
423 struct ip_vs_stats_user ustats0; /* reset values */
424 };
425
426 struct dst_entry;
427 struct iphdr;
428 struct ip_vs_conn;
429 struct ip_vs_app;
430 struct sk_buff;
431 struct ip_vs_proto_data;
432
433 struct ip_vs_protocol {
434 struct ip_vs_protocol *next;
435 char *name;
436 u16 protocol;
437 u16 num_states;
438 int dont_defrag;
439
440 void (*init)(struct ip_vs_protocol *pp);
441
442 void (*exit)(struct ip_vs_protocol *pp);
443
444 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
445
446 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
447
448 int (*conn_schedule)(int af, struct sk_buff *skb,
449 struct ip_vs_proto_data *pd,
450 int *verdict, struct ip_vs_conn **cpp,
451 struct ip_vs_iphdr *iph);
452
453 struct ip_vs_conn *
454 (*conn_in_get)(int af,
455 const struct sk_buff *skb,
456 const struct ip_vs_iphdr *iph,
457 int inverse);
458
459 struct ip_vs_conn *
460 (*conn_out_get)(int af,
461 const struct sk_buff *skb,
462 const struct ip_vs_iphdr *iph,
463 int inverse);
464
465 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
466 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
467
468 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
469 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
470
471 int (*csum_check)(int af, struct sk_buff *skb,
472 struct ip_vs_protocol *pp);
473
474 const char *(*state_name)(int state);
475
476 void (*state_transition)(struct ip_vs_conn *cp, int direction,
477 const struct sk_buff *skb,
478 struct ip_vs_proto_data *pd);
479
480 int (*register_app)(struct net *net, struct ip_vs_app *inc);
481
482 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
483
484 int (*app_conn_bind)(struct ip_vs_conn *cp);
485
486 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
487 const struct sk_buff *skb,
488 int offset,
489 const char *msg);
490
491 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
492 };
493
494 /*
495 * protocol data per netns
496 */
497 struct ip_vs_proto_data {
498 struct ip_vs_proto_data *next;
499 struct ip_vs_protocol *pp;
500 int *timeout_table; /* protocol timeout table */
501 atomic_t appcnt; /* counter of proto app incs. */
502 struct tcp_states_t *tcp_state_table;
503 };
504
505 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
506 struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
507 unsigned short proto);
508
509 struct ip_vs_conn_param {
510 struct net *net;
511 const union nf_inet_addr *caddr;
512 const union nf_inet_addr *vaddr;
513 __be16 cport;
514 __be16 vport;
515 __u16 protocol;
516 u16 af;
517
518 const struct ip_vs_pe *pe;
519 char *pe_data;
520 __u8 pe_data_len;
521 };
522
523 /*
524 * IP_VS structure allocated for each dynamically scheduled connection
525 */
526 struct ip_vs_conn {
527 struct hlist_node c_list; /* hashed list heads */
528 /* Protocol, addresses and port numbers */
529 __be16 cport;
530 __be16 dport;
531 __be16 vport;
532 u16 af; /* address family */
533 union nf_inet_addr caddr; /* client address */
534 union nf_inet_addr vaddr; /* virtual address */
535 union nf_inet_addr daddr; /* destination address */
536 volatile __u32 flags; /* status flags */
537 __u16 protocol; /* Which protocol (TCP/UDP) */
538 #ifdef CONFIG_NET_NS
539 struct net *net; /* Name space */
540 #endif
541
542 /* counter and timer */
543 atomic_t refcnt; /* reference count */
544 struct timer_list timer; /* Expiration timer */
545 volatile unsigned long timeout; /* timeout */
546
547 /* Flags and state transition */
548 spinlock_t lock; /* lock for state transition */
549 volatile __u16 state; /* state info */
550 volatile __u16 old_state; /* old state, to be used for
551 * state transition triggerd
552 * synchronization
553 */
554 __u32 fwmark; /* Fire wall mark from skb */
555 unsigned long sync_endtime; /* jiffies + sent_retries */
556
557 /* Control members */
558 struct ip_vs_conn *control; /* Master control connection */
559 atomic_t n_control; /* Number of controlled ones */
560 struct ip_vs_dest *dest; /* real server */
561 atomic_t in_pkts; /* incoming packet counter */
562
563 /* packet transmitter for different forwarding methods. If it
564 mangles the packet, it must return NF_DROP or better NF_STOLEN,
565 otherwise this must be changed to a sk_buff **.
566 NF_ACCEPT can be returned when destination is local.
567 */
568 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
569 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
570
571 /* Note: we can group the following members into a structure,
572 in order to save more space, and the following members are
573 only used in VS/NAT anyway */
574 struct ip_vs_app *app; /* bound ip_vs_app object */
575 void *app_data; /* Application private data */
576 struct ip_vs_seq in_seq; /* incoming seq. struct */
577 struct ip_vs_seq out_seq; /* outgoing seq. struct */
578
579 const struct ip_vs_pe *pe;
580 char *pe_data;
581 __u8 pe_data_len;
582
583 struct rcu_head rcu_head;
584 };
585
586 /*
587 * To save some memory in conn table when name space is disabled.
588 */
589 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
590 {
591 #ifdef CONFIG_NET_NS
592 return cp->net;
593 #else
594 return &init_net;
595 #endif
596 }
597 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
598 {
599 #ifdef CONFIG_NET_NS
600 cp->net = net;
601 #endif
602 }
603
604 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
605 struct net *net)
606 {
607 #ifdef CONFIG_NET_NS
608 return cp->net == net;
609 #else
610 return 1;
611 #endif
612 }
613
614 /*
615 * Extended internal versions of struct ip_vs_service_user and
616 * ip_vs_dest_user for IPv6 support.
617 *
618 * We need these to conveniently pass around service and destination
619 * options, but unfortunately, we also need to keep the old definitions to
620 * maintain userspace backwards compatibility for the setsockopt interface.
621 */
622 struct ip_vs_service_user_kern {
623 /* virtual service addresses */
624 u16 af;
625 u16 protocol;
626 union nf_inet_addr addr; /* virtual ip address */
627 __be16 port;
628 u32 fwmark; /* firwall mark of service */
629
630 /* virtual service options */
631 char *sched_name;
632 char *pe_name;
633 unsigned int flags; /* virtual service flags */
634 unsigned int timeout; /* persistent timeout in sec */
635 __be32 netmask; /* persistent netmask or plen */
636 };
637
638
639 struct ip_vs_dest_user_kern {
640 /* destination server address */
641 union nf_inet_addr addr;
642 __be16 port;
643
644 /* real server options */
645 unsigned int conn_flags; /* connection flags */
646 int weight; /* destination weight */
647
648 /* thresholds for active connections */
649 u32 u_threshold; /* upper threshold */
650 u32 l_threshold; /* lower threshold */
651 };
652
653
654 /*
655 * The information about the virtual service offered to the net
656 * and the forwarding entries
657 */
658 struct ip_vs_service {
659 struct hlist_node s_list; /* for normal service table */
660 struct hlist_node f_list; /* for fwmark-based service table */
661 atomic_t refcnt; /* reference counter */
662
663 u16 af; /* address family */
664 __u16 protocol; /* which protocol (TCP/UDP) */
665 union nf_inet_addr addr; /* IP address for virtual service */
666 __be16 port; /* port number for the service */
667 __u32 fwmark; /* firewall mark of the service */
668 unsigned int flags; /* service status flags */
669 unsigned int timeout; /* persistent timeout in ticks */
670 __be32 netmask; /* grouping granularity, mask/plen */
671 struct net *net;
672
673 struct list_head destinations; /* real server d-linked list */
674 __u32 num_dests; /* number of servers */
675 struct ip_vs_stats stats; /* statistics for the service */
676
677 /* for scheduling */
678 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
679 spinlock_t sched_lock; /* lock sched_data */
680 void *sched_data; /* scheduler application data */
681
682 /* alternate persistence engine */
683 struct ip_vs_pe __rcu *pe;
684
685 struct rcu_head rcu_head;
686 };
687
688 /* Information for cached dst */
689 struct ip_vs_dest_dst {
690 struct dst_entry *dst_cache; /* destination cache entry */
691 u32 dst_cookie;
692 union nf_inet_addr dst_saddr;
693 struct rcu_head rcu_head;
694 };
695
696 /*
697 * The real server destination forwarding entry
698 * with ip address, port number, and so on.
699 */
700 struct ip_vs_dest {
701 struct list_head n_list; /* for the dests in the service */
702 struct hlist_node d_list; /* for table with all the dests */
703
704 u16 af; /* address family */
705 __be16 port; /* port number of the server */
706 union nf_inet_addr addr; /* IP address of the server */
707 volatile unsigned int flags; /* dest status flags */
708 atomic_t conn_flags; /* flags to copy to conn */
709 atomic_t weight; /* server weight */
710
711 atomic_t refcnt; /* reference counter */
712 struct ip_vs_stats stats; /* statistics */
713 unsigned long idle_start; /* start time, jiffies */
714
715 /* connection counters and thresholds */
716 atomic_t activeconns; /* active connections */
717 atomic_t inactconns; /* inactive connections */
718 atomic_t persistconns; /* persistent connections */
719 __u32 u_threshold; /* upper threshold */
720 __u32 l_threshold; /* lower threshold */
721
722 /* for destination cache */
723 spinlock_t dst_lock; /* lock of dst_cache */
724 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
725
726 /* for virtual service */
727 struct ip_vs_service __rcu *svc; /* service it belongs to */
728 __u16 protocol; /* which protocol (TCP/UDP) */
729 __be16 vport; /* virtual port number */
730 union nf_inet_addr vaddr; /* virtual IP address */
731 __u32 vfwmark; /* firewall mark of service */
732
733 struct list_head t_list; /* in dest_trash */
734 unsigned int in_rs_table:1; /* we are in rs_table */
735 };
736
737
738 /*
739 * The scheduler object
740 */
741 struct ip_vs_scheduler {
742 struct list_head n_list; /* d-linked list head */
743 char *name; /* scheduler name */
744 atomic_t refcnt; /* reference counter */
745 struct module *module; /* THIS_MODULE/NULL */
746
747 /* scheduler initializing service */
748 int (*init_service)(struct ip_vs_service *svc);
749 /* scheduling service finish */
750 void (*done_service)(struct ip_vs_service *svc);
751 /* dest is linked */
752 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
753 /* dest is unlinked */
754 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
755 /* dest is updated */
756 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
757
758 /* selecting a server from the given service */
759 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
760 const struct sk_buff *skb,
761 struct ip_vs_iphdr *iph);
762 };
763
764 /* The persistence engine object */
765 struct ip_vs_pe {
766 struct list_head n_list; /* d-linked list head */
767 char *name; /* scheduler name */
768 atomic_t refcnt; /* reference counter */
769 struct module *module; /* THIS_MODULE/NULL */
770
771 /* get the connection template, if any */
772 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
773 bool (*ct_match)(const struct ip_vs_conn_param *p,
774 struct ip_vs_conn *ct);
775 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
776 bool inverse);
777 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
778 };
779
780 /*
781 * The application module object (a.k.a. app incarnation)
782 */
783 struct ip_vs_app {
784 struct list_head a_list; /* member in app list */
785 int type; /* IP_VS_APP_TYPE_xxx */
786 char *name; /* application module name */
787 __u16 protocol;
788 struct module *module; /* THIS_MODULE/NULL */
789 struct list_head incs_list; /* list of incarnations */
790
791 /* members for application incarnations */
792 struct list_head p_list; /* member in proto app list */
793 struct ip_vs_app *app; /* its real application */
794 __be16 port; /* port number in net order */
795 atomic_t usecnt; /* usage counter */
796 struct rcu_head rcu_head;
797
798 /*
799 * output hook: Process packet in inout direction, diff set for TCP.
800 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
801 * 2=Mangled but checksum was not updated
802 */
803 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
804 struct sk_buff *, int *diff);
805
806 /*
807 * input hook: Process packet in outin direction, diff set for TCP.
808 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
809 * 2=Mangled but checksum was not updated
810 */
811 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
812 struct sk_buff *, int *diff);
813
814 /* ip_vs_app initializer */
815 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
816
817 /* ip_vs_app finish */
818 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
819
820
821 /* not used now */
822 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
823 struct ip_vs_protocol *);
824
825 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
826
827 int * timeout_table;
828 int * timeouts;
829 int timeouts_size;
830
831 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
832 int *verdict, struct ip_vs_conn **cpp);
833
834 struct ip_vs_conn *
835 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
836 const struct iphdr *iph, int inverse);
837
838 struct ip_vs_conn *
839 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
840 const struct iphdr *iph, int inverse);
841
842 int (*state_transition)(struct ip_vs_conn *cp, int direction,
843 const struct sk_buff *skb,
844 struct ip_vs_app *app);
845
846 void (*timeout_change)(struct ip_vs_app *app, int flags);
847 };
848
849 struct ipvs_master_sync_state {
850 struct list_head sync_queue;
851 struct ip_vs_sync_buff *sync_buff;
852 unsigned long sync_queue_len;
853 unsigned int sync_queue_delay;
854 struct task_struct *master_thread;
855 struct delayed_work master_wakeup_work;
856 struct netns_ipvs *ipvs;
857 };
858
859 /* How much time to keep dests in trash */
860 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
861
862 /* IPVS in network namespace */
863 struct netns_ipvs {
864 int gen; /* Generation */
865 int enable; /* enable like nf_hooks do */
866 /*
867 * Hash table: for real service lookups
868 */
869 #define IP_VS_RTAB_BITS 4
870 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
871 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
872
873 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
874 /* ip_vs_app */
875 struct list_head app_list;
876 /* ip_vs_proto */
877 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
878 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
879 /* ip_vs_proto_tcp */
880 #ifdef CONFIG_IP_VS_PROTO_TCP
881 #define TCP_APP_TAB_BITS 4
882 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
883 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
884 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
885 #endif
886 /* ip_vs_proto_udp */
887 #ifdef CONFIG_IP_VS_PROTO_UDP
888 #define UDP_APP_TAB_BITS 4
889 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
890 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
891 struct list_head udp_apps[UDP_APP_TAB_SIZE];
892 #endif
893 /* ip_vs_proto_sctp */
894 #ifdef CONFIG_IP_VS_PROTO_SCTP
895 #define SCTP_APP_TAB_BITS 4
896 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
897 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
898 /* Hash table for SCTP application incarnations */
899 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
900 #endif
901 /* ip_vs_conn */
902 atomic_t conn_count; /* connection counter */
903
904 /* ip_vs_ctl */
905 struct ip_vs_stats tot_stats; /* Statistics & est. */
906
907 int num_services; /* no of virtual services */
908
909 /* Trash for destinations */
910 struct list_head dest_trash;
911 spinlock_t dest_trash_lock;
912 struct timer_list dest_trash_timer; /* expiration timer */
913 /* Service counters */
914 atomic_t ftpsvc_counter;
915 atomic_t nullsvc_counter;
916
917 #ifdef CONFIG_SYSCTL
918 /* 1/rate drop and drop-entry variables */
919 struct delayed_work defense_work; /* Work handler */
920 int drop_rate;
921 int drop_counter;
922 atomic_t dropentry;
923 /* locks in ctl.c */
924 spinlock_t dropentry_lock; /* drop entry handling */
925 spinlock_t droppacket_lock; /* drop packet handling */
926 spinlock_t securetcp_lock; /* state and timeout tables */
927
928 /* sys-ctl struct */
929 struct ctl_table_header *sysctl_hdr;
930 struct ctl_table *sysctl_tbl;
931 #endif
932
933 /* sysctl variables */
934 int sysctl_amemthresh;
935 int sysctl_am_droprate;
936 int sysctl_drop_entry;
937 int sysctl_drop_packet;
938 int sysctl_secure_tcp;
939 #ifdef CONFIG_IP_VS_NFCT
940 int sysctl_conntrack;
941 #endif
942 int sysctl_snat_reroute;
943 int sysctl_sync_ver;
944 int sysctl_sync_ports;
945 int sysctl_sync_persist_mode;
946 unsigned long sysctl_sync_qlen_max;
947 int sysctl_sync_sock_size;
948 int sysctl_cache_bypass;
949 int sysctl_expire_nodest_conn;
950 int sysctl_sloppy_tcp;
951 int sysctl_sloppy_sctp;
952 int sysctl_expire_quiescent_template;
953 int sysctl_sync_threshold[2];
954 unsigned int sysctl_sync_refresh_period;
955 int sysctl_sync_retries;
956 int sysctl_nat_icmp_send;
957 int sysctl_pmtu_disc;
958 int sysctl_backup_only;
959
960 /* ip_vs_lblc */
961 int sysctl_lblc_expiration;
962 struct ctl_table_header *lblc_ctl_header;
963 struct ctl_table *lblc_ctl_table;
964 /* ip_vs_lblcr */
965 int sysctl_lblcr_expiration;
966 struct ctl_table_header *lblcr_ctl_header;
967 struct ctl_table *lblcr_ctl_table;
968 /* ip_vs_est */
969 struct list_head est_list; /* estimator list */
970 spinlock_t est_lock;
971 struct timer_list est_timer; /* Estimation timer */
972 /* ip_vs_sync */
973 spinlock_t sync_lock;
974 struct ipvs_master_sync_state *ms;
975 spinlock_t sync_buff_lock;
976 struct task_struct **backup_threads;
977 int threads_mask;
978 int send_mesg_maxlen;
979 int recv_mesg_maxlen;
980 volatile int sync_state;
981 volatile int master_syncid;
982 volatile int backup_syncid;
983 struct mutex sync_mutex;
984 /* multicast interface name */
985 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
986 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
987 /* net name space ptr */
988 struct net *net; /* Needed by timer routines */
989 };
990
991 #define DEFAULT_SYNC_THRESHOLD 3
992 #define DEFAULT_SYNC_PERIOD 50
993 #define DEFAULT_SYNC_VER 1
994 #define DEFAULT_SLOPPY_TCP 0
995 #define DEFAULT_SLOPPY_SCTP 0
996 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
997 #define DEFAULT_SYNC_RETRIES 0
998 #define IPVS_SYNC_WAKEUP_RATE 8
999 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1000 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
1001 #define IPVS_SYNC_CHECK_PERIOD HZ
1002 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1003 #define IPVS_SYNC_PORTS_MAX (1 << 6)
1004
1005 #ifdef CONFIG_SYSCTL
1006
1007 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1008 {
1009 return ipvs->sysctl_sync_threshold[0];
1010 }
1011
1012 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1013 {
1014 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1015 }
1016
1017 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1018 {
1019 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1020 }
1021
1022 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1023 {
1024 return ipvs->sysctl_sync_retries;
1025 }
1026
1027 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1028 {
1029 return ipvs->sysctl_sync_ver;
1030 }
1031
1032 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1033 {
1034 return ipvs->sysctl_sloppy_tcp;
1035 }
1036
1037 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1038 {
1039 return ipvs->sysctl_sloppy_sctp;
1040 }
1041
1042 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1043 {
1044 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1045 }
1046
1047 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1048 {
1049 return ipvs->sysctl_sync_persist_mode;
1050 }
1051
1052 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1053 {
1054 return ipvs->sysctl_sync_qlen_max;
1055 }
1056
1057 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1058 {
1059 return ipvs->sysctl_sync_sock_size;
1060 }
1061
1062 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1063 {
1064 return ipvs->sysctl_pmtu_disc;
1065 }
1066
1067 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1068 {
1069 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1070 ipvs->sysctl_backup_only;
1071 }
1072
1073 #else
1074
1075 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1076 {
1077 return DEFAULT_SYNC_THRESHOLD;
1078 }
1079
1080 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1081 {
1082 return DEFAULT_SYNC_PERIOD;
1083 }
1084
1085 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1086 {
1087 return DEFAULT_SYNC_REFRESH_PERIOD;
1088 }
1089
1090 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1091 {
1092 return DEFAULT_SYNC_RETRIES & 3;
1093 }
1094
1095 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1096 {
1097 return DEFAULT_SYNC_VER;
1098 }
1099
1100 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1101 {
1102 return DEFAULT_SLOPPY_TCP;
1103 }
1104
1105 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1106 {
1107 return DEFAULT_SLOPPY_SCTP;
1108 }
1109
1110 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1111 {
1112 return 1;
1113 }
1114
1115 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1116 {
1117 return 0;
1118 }
1119
1120 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1121 {
1122 return IPVS_SYNC_QLEN_MAX;
1123 }
1124
1125 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1126 {
1127 return 0;
1128 }
1129
1130 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1131 {
1132 return 1;
1133 }
1134
1135 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1136 {
1137 return 0;
1138 }
1139
1140 #endif
1141
1142 /*
1143 * IPVS core functions
1144 * (from ip_vs_core.c)
1145 */
1146 const char *ip_vs_proto_name(unsigned int proto);
1147 void ip_vs_init_hash_table(struct list_head *table, int rows);
1148 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1149
1150 #define IP_VS_APP_TYPE_FTP 1
1151
1152 /*
1153 * ip_vs_conn handling functions
1154 * (from ip_vs_conn.c)
1155 */
1156
1157 enum {
1158 IP_VS_DIR_INPUT = 0,
1159 IP_VS_DIR_OUTPUT,
1160 IP_VS_DIR_INPUT_ONLY,
1161 IP_VS_DIR_LAST,
1162 };
1163
1164 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1165 const union nf_inet_addr *caddr,
1166 __be16 cport,
1167 const union nf_inet_addr *vaddr,
1168 __be16 vport,
1169 struct ip_vs_conn_param *p)
1170 {
1171 p->net = net;
1172 p->af = af;
1173 p->protocol = protocol;
1174 p->caddr = caddr;
1175 p->cport = cport;
1176 p->vaddr = vaddr;
1177 p->vport = vport;
1178 p->pe = NULL;
1179 p->pe_data = NULL;
1180 }
1181
1182 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1183 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1184
1185 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1186 const struct ip_vs_iphdr *iph,
1187 int inverse);
1188
1189 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1190
1191 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1192 const struct ip_vs_iphdr *iph,
1193 int inverse);
1194
1195 /* Get reference to gain full access to conn.
1196 * By default, RCU read-side critical sections have access only to
1197 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1198 */
1199 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1200 {
1201 return atomic_inc_not_zero(&cp->refcnt);
1202 }
1203
1204 /* put back the conn without restarting its timer */
1205 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1206 {
1207 smp_mb__before_atomic();
1208 atomic_dec(&cp->refcnt);
1209 }
1210 void ip_vs_conn_put(struct ip_vs_conn *cp);
1211 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1212
1213 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1214 const union nf_inet_addr *daddr,
1215 __be16 dport, unsigned int flags,
1216 struct ip_vs_dest *dest, __u32 fwmark);
1217 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1218
1219 const char *ip_vs_state_name(__u16 proto, int state);
1220
1221 void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1222 int ip_vs_check_template(struct ip_vs_conn *ct);
1223 void ip_vs_random_dropentry(struct net *net);
1224 int ip_vs_conn_init(void);
1225 void ip_vs_conn_cleanup(void);
1226
1227 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1228 {
1229 struct ip_vs_conn *ctl_cp = cp->control;
1230 if (!ctl_cp) {
1231 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1232 "%s:%d to %s:%d\n",
1233 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1234 ntohs(cp->cport),
1235 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1236 ntohs(cp->vport));
1237
1238 return;
1239 }
1240
1241 IP_VS_DBG_BUF(7, "DELeting control for: "
1242 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1243 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1244 ntohs(cp->cport),
1245 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1246 ntohs(ctl_cp->cport));
1247
1248 cp->control = NULL;
1249 if (atomic_read(&ctl_cp->n_control) == 0) {
1250 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1251 "%s:%d to %s:%d\n",
1252 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1253 ntohs(cp->cport),
1254 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1255 ntohs(cp->vport));
1256
1257 return;
1258 }
1259 atomic_dec(&ctl_cp->n_control);
1260 }
1261
1262 static inline void
1263 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1264 {
1265 if (cp->control) {
1266 IP_VS_ERR_BUF("request control ADD for already controlled: "
1267 "%s:%d to %s:%d\n",
1268 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1269 ntohs(cp->cport),
1270 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1271 ntohs(cp->vport));
1272
1273 ip_vs_control_del(cp);
1274 }
1275
1276 IP_VS_DBG_BUF(7, "ADDing control for: "
1277 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1278 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1279 ntohs(cp->cport),
1280 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1281 ntohs(ctl_cp->cport));
1282
1283 cp->control = ctl_cp;
1284 atomic_inc(&ctl_cp->n_control);
1285 }
1286
1287 /*
1288 * IPVS netns init & cleanup functions
1289 */
1290 int ip_vs_estimator_net_init(struct net *net);
1291 int ip_vs_control_net_init(struct net *net);
1292 int ip_vs_protocol_net_init(struct net *net);
1293 int ip_vs_app_net_init(struct net *net);
1294 int ip_vs_conn_net_init(struct net *net);
1295 int ip_vs_sync_net_init(struct net *net);
1296 void ip_vs_conn_net_cleanup(struct net *net);
1297 void ip_vs_app_net_cleanup(struct net *net);
1298 void ip_vs_protocol_net_cleanup(struct net *net);
1299 void ip_vs_control_net_cleanup(struct net *net);
1300 void ip_vs_estimator_net_cleanup(struct net *net);
1301 void ip_vs_sync_net_cleanup(struct net *net);
1302 void ip_vs_service_net_cleanup(struct net *net);
1303
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 /*
1327 * Use a #define to avoid all of module.h just for these trivial ops
1328 */
1329 #define ip_vs_pe_get(pe) \
1330 if (pe && pe->module) \
1331 __module_get(pe->module);
1332
1333 #define ip_vs_pe_put(pe) \
1334 if (pe && pe->module) \
1335 module_put(pe->module);
1336
1337 /*
1338 * IPVS protocol functions (from ip_vs_proto.c)
1339 */
1340 int ip_vs_protocol_init(void);
1341 void ip_vs_protocol_cleanup(void);
1342 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1343 int *ip_vs_create_timeout_table(int *table, int size);
1344 int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1345 const char *name, int to);
1346 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1347 const struct sk_buff *skb, int offset,
1348 const char *msg);
1349
1350 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1351 extern struct ip_vs_protocol ip_vs_protocol_udp;
1352 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1353 extern struct ip_vs_protocol ip_vs_protocol_esp;
1354 extern struct ip_vs_protocol ip_vs_protocol_ah;
1355 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1356
1357 /*
1358 * Registering/unregistering scheduler functions
1359 * (from ip_vs_sched.c)
1360 */
1361 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1362 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1363 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1364 struct ip_vs_scheduler *scheduler);
1365 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1366 struct ip_vs_scheduler *sched);
1367 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1368 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1369 struct ip_vs_conn *
1370 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1371 struct ip_vs_proto_data *pd, int *ignored,
1372 struct ip_vs_iphdr *iph);
1373 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1374 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1375
1376 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1377
1378
1379 /*
1380 * IPVS control data and functions (from ip_vs_ctl.c)
1381 */
1382 extern struct ip_vs_stats ip_vs_stats;
1383 extern int sysctl_ip_vs_sync_ver;
1384
1385 struct ip_vs_service *
1386 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1387 const union nf_inet_addr *vaddr, __be16 vport);
1388
1389 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1390 const union nf_inet_addr *daddr, __be16 dport);
1391
1392 int ip_vs_use_count_inc(void);
1393 void ip_vs_use_count_dec(void);
1394 int ip_vs_register_nl_ioctl(void);
1395 void ip_vs_unregister_nl_ioctl(void);
1396 int ip_vs_control_init(void);
1397 void ip_vs_control_cleanup(void);
1398 struct ip_vs_dest *
1399 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1400 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1401 __u16 protocol, __u32 fwmark, __u32 flags);
1402 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1403
1404 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1405 {
1406 atomic_inc(&dest->refcnt);
1407 }
1408
1409 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1410 {
1411 smp_mb__before_atomic();
1412 atomic_dec(&dest->refcnt);
1413 }
1414
1415 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1416 {
1417 if (atomic_dec_return(&dest->refcnt) < 0)
1418 kfree(dest);
1419 }
1420
1421 /*
1422 * IPVS sync daemon data and function prototypes
1423 * (from ip_vs_sync.c)
1424 */
1425 int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
1426 int stop_sync_thread(struct net *net, int state);
1427 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1428
1429 /*
1430 * IPVS rate estimator prototypes (from ip_vs_est.c)
1431 */
1432 void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1433 void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1434 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1435 void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1436 struct ip_vs_stats *stats);
1437
1438 /*
1439 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1440 */
1441 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1442 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1443 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1447 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1448 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1449 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1450 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1451 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1452 struct ip_vs_protocol *pp, int offset,
1453 unsigned int hooknum, struct ip_vs_iphdr *iph);
1454 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1455
1456 #ifdef CONFIG_IP_VS_IPV6
1457 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1458 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1459 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1460 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1461 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1462 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1464 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1466 struct ip_vs_protocol *pp, int offset,
1467 unsigned int hooknum, struct ip_vs_iphdr *iph);
1468 #endif
1469
1470 #ifdef CONFIG_SYSCTL
1471 /*
1472 * This is a simple mechanism to ignore packets when
1473 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1474 * we start to drop 1/rate of the packets
1475 */
1476
1477 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1478 {
1479 if (!ipvs->drop_rate)
1480 return 0;
1481 if (--ipvs->drop_counter > 0)
1482 return 0;
1483 ipvs->drop_counter = ipvs->drop_rate;
1484 return 1;
1485 }
1486 #else
1487 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1488 #endif
1489
1490 /*
1491 * ip_vs_fwd_tag returns the forwarding tag of the connection
1492 */
1493 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1494
1495 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1496 {
1497 char fwd;
1498
1499 switch (IP_VS_FWD_METHOD(cp)) {
1500 case IP_VS_CONN_F_MASQ:
1501 fwd = 'M'; break;
1502 case IP_VS_CONN_F_LOCALNODE:
1503 fwd = 'L'; break;
1504 case IP_VS_CONN_F_TUNNEL:
1505 fwd = 'T'; break;
1506 case IP_VS_CONN_F_DROUTE:
1507 fwd = 'R'; break;
1508 case IP_VS_CONN_F_BYPASS:
1509 fwd = 'B'; break;
1510 default:
1511 fwd = '?'; break;
1512 }
1513 return fwd;
1514 }
1515
1516 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1517 struct ip_vs_conn *cp, int dir);
1518
1519 #ifdef CONFIG_IP_VS_IPV6
1520 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1521 struct ip_vs_conn *cp, int dir);
1522 #endif
1523
1524 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1525
1526 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1527 {
1528 __be32 diff[2] = { ~old, new };
1529
1530 return csum_partial(diff, sizeof(diff), oldsum);
1531 }
1532
1533 #ifdef CONFIG_IP_VS_IPV6
1534 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1535 __wsum oldsum)
1536 {
1537 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1538 new[3], new[2], new[1], new[0] };
1539
1540 return csum_partial(diff, sizeof(diff), oldsum);
1541 }
1542 #endif
1543
1544 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1545 {
1546 __be16 diff[2] = { ~old, new };
1547
1548 return csum_partial(diff, sizeof(diff), oldsum);
1549 }
1550
1551 /*
1552 * Forget current conntrack (unconfirmed) and attach notrack entry
1553 */
1554 static inline void ip_vs_notrack(struct sk_buff *skb)
1555 {
1556 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1557 enum ip_conntrack_info ctinfo;
1558 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1559
1560 if (!ct || !nf_ct_is_untracked(ct)) {
1561 nf_conntrack_put(skb->nfct);
1562 skb->nfct = &nf_ct_untracked_get()->ct_general;
1563 skb->nfctinfo = IP_CT_NEW;
1564 nf_conntrack_get(skb->nfct);
1565 }
1566 #endif
1567 }
1568
1569 #ifdef CONFIG_IP_VS_NFCT
1570 /*
1571 * Netfilter connection tracking
1572 * (from ip_vs_nfct.c)
1573 */
1574 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1575 {
1576 #ifdef CONFIG_SYSCTL
1577 return ipvs->sysctl_conntrack;
1578 #else
1579 return 0;
1580 #endif
1581 }
1582
1583 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1584 int outin);
1585 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1586 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1587 struct ip_vs_conn *cp, u_int8_t proto,
1588 const __be16 port, int from_rs);
1589 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1590
1591 #else
1592
1593 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1594 {
1595 return 0;
1596 }
1597
1598 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1599 struct ip_vs_conn *cp, int outin)
1600 {
1601 }
1602
1603 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1604 {
1605 return NF_ACCEPT;
1606 }
1607
1608 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1609 {
1610 }
1611 /* CONFIG_IP_VS_NFCT */
1612 #endif
1613
1614 static inline int
1615 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1616 {
1617 /*
1618 * We think the overhead of processing active connections is 256
1619 * times higher than that of inactive connections in average. (This
1620 * 256 times might not be accurate, we will change it later) We
1621 * use the following formula to estimate the overhead now:
1622 * dest->activeconns*256 + dest->inactconns
1623 */
1624 return (atomic_read(&dest->activeconns) << 8) +
1625 atomic_read(&dest->inactconns);
1626 }
1627
1628 #endif /* _NET_IP_VS_H */
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