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[mirror_ubuntu-zesty-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 /* This function is a faster version of ip_vs_fill_iph_skb().
201 * Where we only populate {s,d}addr (and avoid calling ipv6_find_hdr()).
202 * This is used by the some of the ip_vs_*_schedule() functions.
203 * (Mostly done to avoid ABI breakage of external schedulers)
204 */
205 static inline void
206 ip_vs_fill_iph_addr_only(int af, const struct sk_buff *skb,
207 struct ip_vs_iphdr *iphdr)
208 {
209 #ifdef CONFIG_IP_VS_IPV6
210 if (af == AF_INET6) {
211 const struct ipv6hdr *iph =
212 (struct ipv6hdr *)skb_network_header(skb);
213 iphdr->saddr.in6 = iph->saddr;
214 iphdr->daddr.in6 = iph->daddr;
215 } else
216 #endif
217 {
218 const struct iphdr *iph =
219 (struct iphdr *)skb_network_header(skb);
220 iphdr->saddr.ip = iph->saddr;
221 iphdr->daddr.ip = iph->daddr;
222 }
223 }
224
225 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
226 const union nf_inet_addr *src)
227 {
228 #ifdef CONFIG_IP_VS_IPV6
229 if (af == AF_INET6)
230 dst->in6 = src->in6;
231 else
232 #endif
233 dst->ip = src->ip;
234 }
235
236 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
237 const union nf_inet_addr *b)
238 {
239 #ifdef CONFIG_IP_VS_IPV6
240 if (af == AF_INET6)
241 return ipv6_addr_equal(&a->in6, &b->in6);
242 #endif
243 return a->ip == b->ip;
244 }
245
246 #ifdef CONFIG_IP_VS_DEBUG
247 #include <linux/net.h>
248
249 extern int ip_vs_get_debug_level(void);
250
251 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
252 const union nf_inet_addr *addr,
253 int *idx)
254 {
255 int len;
256 #ifdef CONFIG_IP_VS_IPV6
257 if (af == AF_INET6)
258 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
259 &addr->in6) + 1;
260 else
261 #endif
262 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
263 &addr->ip) + 1;
264
265 *idx += len;
266 BUG_ON(*idx > buf_len + 1);
267 return &buf[*idx - len];
268 }
269
270 #define IP_VS_DBG_BUF(level, msg, ...) \
271 do { \
272 char ip_vs_dbg_buf[160]; \
273 int ip_vs_dbg_idx = 0; \
274 if (level <= ip_vs_get_debug_level()) \
275 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
276 } while (0)
277 #define IP_VS_ERR_BUF(msg...) \
278 do { \
279 char ip_vs_dbg_buf[160]; \
280 int ip_vs_dbg_idx = 0; \
281 pr_err(msg); \
282 } while (0)
283
284 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
285 #define IP_VS_DBG_ADDR(af, addr) \
286 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
287 sizeof(ip_vs_dbg_buf), addr, \
288 &ip_vs_dbg_idx)
289
290 #define IP_VS_DBG(level, msg, ...) \
291 do { \
292 if (level <= ip_vs_get_debug_level()) \
293 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
294 } while (0)
295 #define IP_VS_DBG_RL(msg, ...) \
296 do { \
297 if (net_ratelimit()) \
298 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
299 } while (0)
300 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
301 do { \
302 if (level <= ip_vs_get_debug_level()) \
303 pp->debug_packet(af, pp, skb, ofs, msg); \
304 } while (0)
305 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
306 do { \
307 if (level <= ip_vs_get_debug_level() && \
308 net_ratelimit()) \
309 pp->debug_packet(af, pp, skb, ofs, msg); \
310 } while (0)
311 #else /* NO DEBUGGING at ALL */
312 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
313 #define IP_VS_ERR_BUF(msg...) do {} while (0)
314 #define IP_VS_DBG(level, msg...) do {} while (0)
315 #define IP_VS_DBG_RL(msg...) do {} while (0)
316 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
317 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
318 #endif
319
320 #define IP_VS_BUG() BUG()
321 #define IP_VS_ERR_RL(msg, ...) \
322 do { \
323 if (net_ratelimit()) \
324 pr_err(msg, ##__VA_ARGS__); \
325 } while (0)
326
327 #ifdef CONFIG_IP_VS_DEBUG
328 #define EnterFunction(level) \
329 do { \
330 if (level <= ip_vs_get_debug_level()) \
331 printk(KERN_DEBUG \
332 pr_fmt("Enter: %s, %s line %i\n"), \
333 __func__, __FILE__, __LINE__); \
334 } while (0)
335 #define LeaveFunction(level) \
336 do { \
337 if (level <= ip_vs_get_debug_level()) \
338 printk(KERN_DEBUG \
339 pr_fmt("Leave: %s, %s line %i\n"), \
340 __func__, __FILE__, __LINE__); \
341 } while (0)
342 #else
343 #define EnterFunction(level) do {} while (0)
344 #define LeaveFunction(level) do {} while (0)
345 #endif
346
347 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
348
349
350 /*
351 * The port number of FTP service (in network order).
352 */
353 #define FTPPORT cpu_to_be16(21)
354 #define FTPDATA cpu_to_be16(20)
355
356 /*
357 * TCP State Values
358 */
359 enum {
360 IP_VS_TCP_S_NONE = 0,
361 IP_VS_TCP_S_ESTABLISHED,
362 IP_VS_TCP_S_SYN_SENT,
363 IP_VS_TCP_S_SYN_RECV,
364 IP_VS_TCP_S_FIN_WAIT,
365 IP_VS_TCP_S_TIME_WAIT,
366 IP_VS_TCP_S_CLOSE,
367 IP_VS_TCP_S_CLOSE_WAIT,
368 IP_VS_TCP_S_LAST_ACK,
369 IP_VS_TCP_S_LISTEN,
370 IP_VS_TCP_S_SYNACK,
371 IP_VS_TCP_S_LAST
372 };
373
374 /*
375 * UDP State Values
376 */
377 enum {
378 IP_VS_UDP_S_NORMAL,
379 IP_VS_UDP_S_LAST,
380 };
381
382 /*
383 * ICMP State Values
384 */
385 enum {
386 IP_VS_ICMP_S_NORMAL,
387 IP_VS_ICMP_S_LAST,
388 };
389
390 /*
391 * SCTP State Values
392 */
393 enum ip_vs_sctp_states {
394 IP_VS_SCTP_S_NONE,
395 IP_VS_SCTP_S_INIT_CLI,
396 IP_VS_SCTP_S_INIT_SER,
397 IP_VS_SCTP_S_INIT_ACK_CLI,
398 IP_VS_SCTP_S_INIT_ACK_SER,
399 IP_VS_SCTP_S_ECHO_CLI,
400 IP_VS_SCTP_S_ECHO_SER,
401 IP_VS_SCTP_S_ESTABLISHED,
402 IP_VS_SCTP_S_SHUT_CLI,
403 IP_VS_SCTP_S_SHUT_SER,
404 IP_VS_SCTP_S_SHUT_ACK_CLI,
405 IP_VS_SCTP_S_SHUT_ACK_SER,
406 IP_VS_SCTP_S_CLOSED,
407 IP_VS_SCTP_S_LAST
408 };
409
410 /*
411 * Delta sequence info structure
412 * Each ip_vs_conn has 2 (output AND input seq. changes).
413 * Only used in the VS/NAT.
414 */
415 struct ip_vs_seq {
416 __u32 init_seq; /* Add delta from this seq */
417 __u32 delta; /* Delta in sequence numbers */
418 __u32 previous_delta; /* Delta in sequence numbers
419 before last resized pkt */
420 };
421
422 /*
423 * counters per cpu
424 */
425 struct ip_vs_counters {
426 __u32 conns; /* connections scheduled */
427 __u32 inpkts; /* incoming packets */
428 __u32 outpkts; /* outgoing packets */
429 __u64 inbytes; /* incoming bytes */
430 __u64 outbytes; /* outgoing bytes */
431 };
432 /*
433 * Stats per cpu
434 */
435 struct ip_vs_cpu_stats {
436 struct ip_vs_counters ustats;
437 struct u64_stats_sync syncp;
438 };
439
440 /*
441 * IPVS statistics objects
442 */
443 struct ip_vs_estimator {
444 struct list_head list;
445
446 u64 last_inbytes;
447 u64 last_outbytes;
448 u32 last_conns;
449 u32 last_inpkts;
450 u32 last_outpkts;
451
452 u32 cps;
453 u32 inpps;
454 u32 outpps;
455 u32 inbps;
456 u32 outbps;
457 };
458
459 struct ip_vs_stats {
460 struct ip_vs_stats_user ustats; /* statistics */
461 struct ip_vs_estimator est; /* estimator */
462 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
463 spinlock_t lock; /* spin lock */
464 struct ip_vs_stats_user ustats0; /* reset values */
465 };
466
467 struct dst_entry;
468 struct iphdr;
469 struct ip_vs_conn;
470 struct ip_vs_app;
471 struct sk_buff;
472 struct ip_vs_proto_data;
473
474 struct ip_vs_protocol {
475 struct ip_vs_protocol *next;
476 char *name;
477 u16 protocol;
478 u16 num_states;
479 int dont_defrag;
480
481 void (*init)(struct ip_vs_protocol *pp);
482
483 void (*exit)(struct ip_vs_protocol *pp);
484
485 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
486
487 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
488
489 int (*conn_schedule)(int af, struct sk_buff *skb,
490 struct ip_vs_proto_data *pd,
491 int *verdict, struct ip_vs_conn **cpp,
492 struct ip_vs_iphdr *iph);
493
494 struct ip_vs_conn *
495 (*conn_in_get)(int af,
496 const struct sk_buff *skb,
497 const struct ip_vs_iphdr *iph,
498 int inverse);
499
500 struct ip_vs_conn *
501 (*conn_out_get)(int af,
502 const struct sk_buff *skb,
503 const struct ip_vs_iphdr *iph,
504 int inverse);
505
506 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
507 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
508
509 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
510 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
511
512 int (*csum_check)(int af, struct sk_buff *skb,
513 struct ip_vs_protocol *pp);
514
515 const char *(*state_name)(int state);
516
517 void (*state_transition)(struct ip_vs_conn *cp, int direction,
518 const struct sk_buff *skb,
519 struct ip_vs_proto_data *pd);
520
521 int (*register_app)(struct net *net, struct ip_vs_app *inc);
522
523 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
524
525 int (*app_conn_bind)(struct ip_vs_conn *cp);
526
527 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
528 const struct sk_buff *skb,
529 int offset,
530 const char *msg);
531
532 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
533 };
534
535 /*
536 * protocol data per netns
537 */
538 struct ip_vs_proto_data {
539 struct ip_vs_proto_data *next;
540 struct ip_vs_protocol *pp;
541 int *timeout_table; /* protocol timeout table */
542 atomic_t appcnt; /* counter of proto app incs. */
543 struct tcp_states_t *tcp_state_table;
544 };
545
546 extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
547 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
548 unsigned short proto);
549
550 struct ip_vs_conn_param {
551 struct net *net;
552 const union nf_inet_addr *caddr;
553 const union nf_inet_addr *vaddr;
554 __be16 cport;
555 __be16 vport;
556 __u16 protocol;
557 u16 af;
558
559 const struct ip_vs_pe *pe;
560 char *pe_data;
561 __u8 pe_data_len;
562 };
563
564 /*
565 * IP_VS structure allocated for each dynamically scheduled connection
566 */
567 struct ip_vs_conn {
568 struct hlist_node c_list; /* hashed list heads */
569 #ifdef CONFIG_NET_NS
570 struct net *net; /* Name space */
571 #endif
572 /* Protocol, addresses and port numbers */
573 u16 af; /* address family */
574 __be16 cport;
575 __be16 vport;
576 __be16 dport;
577 __u32 fwmark; /* Fire wall mark from skb */
578 union nf_inet_addr caddr; /* client address */
579 union nf_inet_addr vaddr; /* virtual address */
580 union nf_inet_addr daddr; /* destination address */
581 volatile __u32 flags; /* status flags */
582 __u16 protocol; /* Which protocol (TCP/UDP) */
583
584 /* counter and timer */
585 atomic_t refcnt; /* reference count */
586 struct timer_list timer; /* Expiration timer */
587 volatile unsigned long timeout; /* timeout */
588
589 /* Flags and state transition */
590 spinlock_t lock; /* lock for state transition */
591 volatile __u16 state; /* state info */
592 volatile __u16 old_state; /* old state, to be used for
593 * state transition triggerd
594 * synchronization
595 */
596 unsigned long sync_endtime; /* jiffies + sent_retries */
597
598 /* Control members */
599 struct ip_vs_conn *control; /* Master control connection */
600 atomic_t n_control; /* Number of controlled ones */
601 struct ip_vs_dest *dest; /* real server */
602 atomic_t in_pkts; /* incoming packet counter */
603
604 /* packet transmitter for different forwarding methods. If it
605 mangles the packet, it must return NF_DROP or better NF_STOLEN,
606 otherwise this must be changed to a sk_buff **.
607 NF_ACCEPT can be returned when destination is local.
608 */
609 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
610 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
611
612 /* Note: we can group the following members into a structure,
613 in order to save more space, and the following members are
614 only used in VS/NAT anyway */
615 struct ip_vs_app *app; /* bound ip_vs_app object */
616 void *app_data; /* Application private data */
617 struct ip_vs_seq in_seq; /* incoming seq. struct */
618 struct ip_vs_seq out_seq; /* outgoing seq. struct */
619
620 const struct ip_vs_pe *pe;
621 char *pe_data;
622 __u8 pe_data_len;
623 };
624
625 /*
626 * To save some memory in conn table when name space is disabled.
627 */
628 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
629 {
630 #ifdef CONFIG_NET_NS
631 return cp->net;
632 #else
633 return &init_net;
634 #endif
635 }
636 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
637 {
638 #ifdef CONFIG_NET_NS
639 cp->net = net;
640 #endif
641 }
642
643 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
644 struct net *net)
645 {
646 #ifdef CONFIG_NET_NS
647 return cp->net == net;
648 #else
649 return 1;
650 #endif
651 }
652
653 /*
654 * Extended internal versions of struct ip_vs_service_user and
655 * ip_vs_dest_user for IPv6 support.
656 *
657 * We need these to conveniently pass around service and destination
658 * options, but unfortunately, we also need to keep the old definitions to
659 * maintain userspace backwards compatibility for the setsockopt interface.
660 */
661 struct ip_vs_service_user_kern {
662 /* virtual service addresses */
663 u16 af;
664 u16 protocol;
665 union nf_inet_addr addr; /* virtual ip address */
666 u16 port;
667 u32 fwmark; /* firwall mark of service */
668
669 /* virtual service options */
670 char *sched_name;
671 char *pe_name;
672 unsigned int flags; /* virtual service flags */
673 unsigned int timeout; /* persistent timeout in sec */
674 u32 netmask; /* persistent netmask */
675 };
676
677
678 struct ip_vs_dest_user_kern {
679 /* destination server address */
680 union nf_inet_addr addr;
681 u16 port;
682
683 /* real server options */
684 unsigned int conn_flags; /* connection flags */
685 int weight; /* destination weight */
686
687 /* thresholds for active connections */
688 u32 u_threshold; /* upper threshold */
689 u32 l_threshold; /* lower threshold */
690 };
691
692
693 /*
694 * The information about the virtual service offered to the net
695 * and the forwarding entries
696 */
697 struct ip_vs_service {
698 struct list_head s_list; /* for normal service table */
699 struct list_head f_list; /* for fwmark-based service table */
700 atomic_t refcnt; /* reference counter */
701 atomic_t usecnt; /* use counter */
702
703 u16 af; /* address family */
704 __u16 protocol; /* which protocol (TCP/UDP) */
705 union nf_inet_addr addr; /* IP address for virtual service */
706 __be16 port; /* port number for the service */
707 __u32 fwmark; /* firewall mark of the service */
708 unsigned int flags; /* service status flags */
709 unsigned int timeout; /* persistent timeout in ticks */
710 __be32 netmask; /* grouping granularity */
711 struct net *net;
712
713 struct list_head destinations; /* real server d-linked list */
714 __u32 num_dests; /* number of servers */
715 struct ip_vs_stats stats; /* statistics for the service */
716 struct ip_vs_app *inc; /* bind conns to this app inc */
717
718 /* for scheduling */
719 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
720 rwlock_t sched_lock; /* lock sched_data */
721 void *sched_data; /* scheduler application data */
722
723 /* alternate persistence engine */
724 struct ip_vs_pe *pe;
725 };
726
727
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 list_head 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
746 /* connection counters and thresholds */
747 atomic_t activeconns; /* active connections */
748 atomic_t inactconns; /* inactive connections */
749 atomic_t persistconns; /* persistent connections */
750 __u32 u_threshold; /* upper threshold */
751 __u32 l_threshold; /* lower threshold */
752
753 /* for destination cache */
754 spinlock_t dst_lock; /* lock of dst_cache */
755 struct dst_entry *dst_cache; /* destination cache entry */
756 u32 dst_cookie;
757 union nf_inet_addr dst_saddr;
758
759 /* for virtual service */
760 struct ip_vs_service *svc; /* service it belongs to */
761 __u16 protocol; /* which protocol (TCP/UDP) */
762 __be16 vport; /* virtual port number */
763 union nf_inet_addr vaddr; /* virtual IP address */
764 __u32 vfwmark; /* firewall mark of service */
765 };
766
767
768 /*
769 * The scheduler object
770 */
771 struct ip_vs_scheduler {
772 struct list_head n_list; /* d-linked list head */
773 char *name; /* scheduler name */
774 atomic_t refcnt; /* reference counter */
775 struct module *module; /* THIS_MODULE/NULL */
776
777 /* scheduler initializing service */
778 int (*init_service)(struct ip_vs_service *svc);
779 /* scheduling service finish */
780 int (*done_service)(struct ip_vs_service *svc);
781 /* scheduler updating service */
782 int (*update_service)(struct ip_vs_service *svc);
783
784 /* selecting a server from the given service */
785 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
786 const struct sk_buff *skb);
787 };
788
789 /* The persistence engine object */
790 struct ip_vs_pe {
791 struct list_head n_list; /* d-linked list head */
792 char *name; /* scheduler name */
793 atomic_t refcnt; /* reference counter */
794 struct module *module; /* THIS_MODULE/NULL */
795
796 /* get the connection template, if any */
797 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
798 bool (*ct_match)(const struct ip_vs_conn_param *p,
799 struct ip_vs_conn *ct);
800 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
801 bool inverse);
802 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
803 };
804
805 /*
806 * The application module object (a.k.a. app incarnation)
807 */
808 struct ip_vs_app {
809 struct list_head a_list; /* member in app list */
810 int type; /* IP_VS_APP_TYPE_xxx */
811 char *name; /* application module name */
812 __u16 protocol;
813 struct module *module; /* THIS_MODULE/NULL */
814 struct list_head incs_list; /* list of incarnations */
815
816 /* members for application incarnations */
817 struct list_head p_list; /* member in proto app list */
818 struct ip_vs_app *app; /* its real application */
819 __be16 port; /* port number in net order */
820 atomic_t usecnt; /* usage counter */
821
822 /*
823 * output hook: Process packet in inout direction, diff set for TCP.
824 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
825 * 2=Mangled but checksum was not updated
826 */
827 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
828 struct sk_buff *, int *diff);
829
830 /*
831 * input hook: Process packet in outin direction, diff set for TCP.
832 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
833 * 2=Mangled but checksum was not updated
834 */
835 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
836 struct sk_buff *, int *diff);
837
838 /* ip_vs_app initializer */
839 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
840
841 /* ip_vs_app finish */
842 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
843
844
845 /* not used now */
846 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
847 struct ip_vs_protocol *);
848
849 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
850
851 int * timeout_table;
852 int * timeouts;
853 int timeouts_size;
854
855 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
856 int *verdict, struct ip_vs_conn **cpp);
857
858 struct ip_vs_conn *
859 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
860 const struct iphdr *iph, int inverse);
861
862 struct ip_vs_conn *
863 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
864 const struct iphdr *iph, int inverse);
865
866 int (*state_transition)(struct ip_vs_conn *cp, int direction,
867 const struct sk_buff *skb,
868 struct ip_vs_app *app);
869
870 void (*timeout_change)(struct ip_vs_app *app, int flags);
871 };
872
873 struct ipvs_master_sync_state {
874 struct list_head sync_queue;
875 struct ip_vs_sync_buff *sync_buff;
876 int sync_queue_len;
877 unsigned int sync_queue_delay;
878 struct task_struct *master_thread;
879 struct delayed_work master_wakeup_work;
880 struct netns_ipvs *ipvs;
881 };
882
883 /* IPVS in network namespace */
884 struct netns_ipvs {
885 int gen; /* Generation */
886 int enable; /* enable like nf_hooks do */
887 /*
888 * Hash table: for real service lookups
889 */
890 #define IP_VS_RTAB_BITS 4
891 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
892 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
893
894 struct list_head rs_table[IP_VS_RTAB_SIZE];
895 /* ip_vs_app */
896 struct list_head app_list;
897 /* ip_vs_proto */
898 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
899 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
900 /* ip_vs_proto_tcp */
901 #ifdef CONFIG_IP_VS_PROTO_TCP
902 #define TCP_APP_TAB_BITS 4
903 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
904 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
905 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
906 spinlock_t tcp_app_lock;
907 #endif
908 /* ip_vs_proto_udp */
909 #ifdef CONFIG_IP_VS_PROTO_UDP
910 #define UDP_APP_TAB_BITS 4
911 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
912 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
913 struct list_head udp_apps[UDP_APP_TAB_SIZE];
914 spinlock_t udp_app_lock;
915 #endif
916 /* ip_vs_proto_sctp */
917 #ifdef CONFIG_IP_VS_PROTO_SCTP
918 #define SCTP_APP_TAB_BITS 4
919 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
920 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
921 /* Hash table for SCTP application incarnations */
922 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
923 spinlock_t sctp_app_lock;
924 #endif
925 /* ip_vs_conn */
926 atomic_t conn_count; /* connection counter */
927
928 /* ip_vs_ctl */
929 struct ip_vs_stats tot_stats; /* Statistics & est. */
930
931 int num_services; /* no of virtual services */
932
933 rwlock_t rs_lock; /* real services table */
934 /* Trash for destinations */
935 struct list_head dest_trash;
936 /* Service counters */
937 atomic_t ftpsvc_counter;
938 atomic_t nullsvc_counter;
939
940 #ifdef CONFIG_SYSCTL
941 /* 1/rate drop and drop-entry variables */
942 struct delayed_work defense_work; /* Work handler */
943 int drop_rate;
944 int drop_counter;
945 atomic_t dropentry;
946 /* locks in ctl.c */
947 spinlock_t dropentry_lock; /* drop entry handling */
948 spinlock_t droppacket_lock; /* drop packet handling */
949 spinlock_t securetcp_lock; /* state and timeout tables */
950
951 /* sys-ctl struct */
952 struct ctl_table_header *sysctl_hdr;
953 struct ctl_table *sysctl_tbl;
954 #endif
955
956 /* sysctl variables */
957 int sysctl_amemthresh;
958 int sysctl_am_droprate;
959 int sysctl_drop_entry;
960 int sysctl_drop_packet;
961 int sysctl_secure_tcp;
962 #ifdef CONFIG_IP_VS_NFCT
963 int sysctl_conntrack;
964 #endif
965 int sysctl_snat_reroute;
966 int sysctl_sync_ver;
967 int sysctl_sync_ports;
968 int sysctl_sync_qlen_max;
969 int sysctl_sync_sock_size;
970 int sysctl_cache_bypass;
971 int sysctl_expire_nodest_conn;
972 int sysctl_expire_quiescent_template;
973 int sysctl_sync_threshold[2];
974 unsigned int sysctl_sync_refresh_period;
975 int sysctl_sync_retries;
976 int sysctl_nat_icmp_send;
977 int sysctl_pmtu_disc;
978 int sysctl_backup_only;
979
980 /* ip_vs_lblc */
981 int sysctl_lblc_expiration;
982 struct ctl_table_header *lblc_ctl_header;
983 struct ctl_table *lblc_ctl_table;
984 /* ip_vs_lblcr */
985 int sysctl_lblcr_expiration;
986 struct ctl_table_header *lblcr_ctl_header;
987 struct ctl_table *lblcr_ctl_table;
988 /* ip_vs_est */
989 struct list_head est_list; /* estimator list */
990 spinlock_t est_lock;
991 struct timer_list est_timer; /* Estimation timer */
992 /* ip_vs_sync */
993 spinlock_t sync_lock;
994 struct ipvs_master_sync_state *ms;
995 spinlock_t sync_buff_lock;
996 struct task_struct **backup_threads;
997 int threads_mask;
998 int send_mesg_maxlen;
999 int recv_mesg_maxlen;
1000 volatile int sync_state;
1001 volatile int master_syncid;
1002 volatile int backup_syncid;
1003 struct mutex sync_mutex;
1004 /* multicast interface name */
1005 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
1006 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
1007 /* net name space ptr */
1008 struct net *net; /* Needed by timer routines */
1009 };
1010
1011 #define DEFAULT_SYNC_THRESHOLD 3
1012 #define DEFAULT_SYNC_PERIOD 50
1013 #define DEFAULT_SYNC_VER 1
1014 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
1015 #define DEFAULT_SYNC_RETRIES 0
1016 #define IPVS_SYNC_WAKEUP_RATE 8
1017 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1018 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
1019 #define IPVS_SYNC_CHECK_PERIOD HZ
1020 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1021 #define IPVS_SYNC_PORTS_MAX (1 << 6)
1022
1023 #ifdef CONFIG_SYSCTL
1024
1025 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1026 {
1027 return ipvs->sysctl_sync_threshold[0];
1028 }
1029
1030 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1031 {
1032 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1033 }
1034
1035 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1036 {
1037 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1038 }
1039
1040 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1041 {
1042 return ipvs->sysctl_sync_retries;
1043 }
1044
1045 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1046 {
1047 return ipvs->sysctl_sync_ver;
1048 }
1049
1050 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1051 {
1052 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1053 }
1054
1055 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1056 {
1057 return ipvs->sysctl_sync_qlen_max;
1058 }
1059
1060 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1061 {
1062 return ipvs->sysctl_sync_sock_size;
1063 }
1064
1065 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1066 {
1067 return ipvs->sysctl_pmtu_disc;
1068 }
1069
1070 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1071 {
1072 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1073 ipvs->sysctl_backup_only;
1074 }
1075
1076 #else
1077
1078 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1079 {
1080 return DEFAULT_SYNC_THRESHOLD;
1081 }
1082
1083 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1084 {
1085 return DEFAULT_SYNC_PERIOD;
1086 }
1087
1088 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1089 {
1090 return DEFAULT_SYNC_REFRESH_PERIOD;
1091 }
1092
1093 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1094 {
1095 return DEFAULT_SYNC_RETRIES & 3;
1096 }
1097
1098 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1099 {
1100 return DEFAULT_SYNC_VER;
1101 }
1102
1103 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1104 {
1105 return 1;
1106 }
1107
1108 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1109 {
1110 return IPVS_SYNC_QLEN_MAX;
1111 }
1112
1113 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1114 {
1115 return 0;
1116 }
1117
1118 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1119 {
1120 return 1;
1121 }
1122
1123 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1124 {
1125 return 0;
1126 }
1127
1128 #endif
1129
1130 /*
1131 * IPVS core functions
1132 * (from ip_vs_core.c)
1133 */
1134 extern const char *ip_vs_proto_name(unsigned int proto);
1135 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
1136 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1137
1138 #define IP_VS_APP_TYPE_FTP 1
1139
1140 /*
1141 * ip_vs_conn handling functions
1142 * (from ip_vs_conn.c)
1143 */
1144
1145 enum {
1146 IP_VS_DIR_INPUT = 0,
1147 IP_VS_DIR_OUTPUT,
1148 IP_VS_DIR_INPUT_ONLY,
1149 IP_VS_DIR_LAST,
1150 };
1151
1152 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1153 const union nf_inet_addr *caddr,
1154 __be16 cport,
1155 const union nf_inet_addr *vaddr,
1156 __be16 vport,
1157 struct ip_vs_conn_param *p)
1158 {
1159 p->net = net;
1160 p->af = af;
1161 p->protocol = protocol;
1162 p->caddr = caddr;
1163 p->cport = cport;
1164 p->vaddr = vaddr;
1165 p->vport = vport;
1166 p->pe = NULL;
1167 p->pe_data = NULL;
1168 }
1169
1170 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1171 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1172
1173 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1174 const struct ip_vs_iphdr *iph,
1175 int inverse);
1176
1177 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1178
1179 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1180 const struct ip_vs_iphdr *iph,
1181 int inverse);
1182
1183 /* put back the conn without restarting its timer */
1184 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1185 {
1186 atomic_dec(&cp->refcnt);
1187 }
1188 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1189 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1190
1191 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1192 const union nf_inet_addr *daddr,
1193 __be16 dport, unsigned int flags,
1194 struct ip_vs_dest *dest, __u32 fwmark);
1195 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1196
1197 extern const char * ip_vs_state_name(__u16 proto, int state);
1198
1199 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1200 extern int ip_vs_check_template(struct ip_vs_conn *ct);
1201 extern void ip_vs_random_dropentry(struct net *net);
1202 extern int ip_vs_conn_init(void);
1203 extern void ip_vs_conn_cleanup(void);
1204
1205 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1206 {
1207 struct ip_vs_conn *ctl_cp = cp->control;
1208 if (!ctl_cp) {
1209 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1210 "%s:%d to %s:%d\n",
1211 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1212 ntohs(cp->cport),
1213 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1214 ntohs(cp->vport));
1215
1216 return;
1217 }
1218
1219 IP_VS_DBG_BUF(7, "DELeting control for: "
1220 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1221 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1222 ntohs(cp->cport),
1223 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1224 ntohs(ctl_cp->cport));
1225
1226 cp->control = NULL;
1227 if (atomic_read(&ctl_cp->n_control) == 0) {
1228 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1229 "%s:%d to %s:%d\n",
1230 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1231 ntohs(cp->cport),
1232 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1233 ntohs(cp->vport));
1234
1235 return;
1236 }
1237 atomic_dec(&ctl_cp->n_control);
1238 }
1239
1240 static inline void
1241 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1242 {
1243 if (cp->control) {
1244 IP_VS_ERR_BUF("request control ADD for already controlled: "
1245 "%s:%d to %s:%d\n",
1246 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1247 ntohs(cp->cport),
1248 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1249 ntohs(cp->vport));
1250
1251 ip_vs_control_del(cp);
1252 }
1253
1254 IP_VS_DBG_BUF(7, "ADDing control for: "
1255 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1256 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1257 ntohs(cp->cport),
1258 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1259 ntohs(ctl_cp->cport));
1260
1261 cp->control = ctl_cp;
1262 atomic_inc(&ctl_cp->n_control);
1263 }
1264
1265 /*
1266 * IPVS netns init & cleanup functions
1267 */
1268 extern int ip_vs_estimator_net_init(struct net *net);
1269 extern int ip_vs_control_net_init(struct net *net);
1270 extern int ip_vs_protocol_net_init(struct net *net);
1271 extern int ip_vs_app_net_init(struct net *net);
1272 extern int ip_vs_conn_net_init(struct net *net);
1273 extern int ip_vs_sync_net_init(struct net *net);
1274 extern void ip_vs_conn_net_cleanup(struct net *net);
1275 extern void ip_vs_app_net_cleanup(struct net *net);
1276 extern void ip_vs_protocol_net_cleanup(struct net *net);
1277 extern void ip_vs_control_net_cleanup(struct net *net);
1278 extern void ip_vs_estimator_net_cleanup(struct net *net);
1279 extern void ip_vs_sync_net_cleanup(struct net *net);
1280 extern void ip_vs_service_net_cleanup(struct net *net);
1281
1282 /*
1283 * IPVS application functions
1284 * (from ip_vs_app.c)
1285 */
1286 #define IP_VS_APP_MAX_PORTS 8
1287 extern struct ip_vs_app *register_ip_vs_app(struct net *net,
1288 struct ip_vs_app *app);
1289 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1290 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1291 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1292 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1293 __u16 proto, __u16 port);
1294 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1295 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1296
1297 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1298 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1299
1300 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1301 void ip_vs_unbind_pe(struct ip_vs_service *svc);
1302 int register_ip_vs_pe(struct ip_vs_pe *pe);
1303 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1304 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1305 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1306
1307 /*
1308 * Use a #define to avoid all of module.h just for these trivial ops
1309 */
1310 #define ip_vs_pe_get(pe) \
1311 if (pe && pe->module) \
1312 __module_get(pe->module);
1313
1314 #define ip_vs_pe_put(pe) \
1315 if (pe && pe->module) \
1316 module_put(pe->module);
1317
1318 /*
1319 * IPVS protocol functions (from ip_vs_proto.c)
1320 */
1321 extern int ip_vs_protocol_init(void);
1322 extern void ip_vs_protocol_cleanup(void);
1323 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1324 extern int *ip_vs_create_timeout_table(int *table, int size);
1325 extern int
1326 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1327 const char *name, int to);
1328 extern void
1329 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1330 const struct sk_buff *skb,
1331 int offset, const char *msg);
1332
1333 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1334 extern struct ip_vs_protocol ip_vs_protocol_udp;
1335 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1336 extern struct ip_vs_protocol ip_vs_protocol_esp;
1337 extern struct ip_vs_protocol ip_vs_protocol_ah;
1338 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1339
1340 /*
1341 * Registering/unregistering scheduler functions
1342 * (from ip_vs_sched.c)
1343 */
1344 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1345 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1346 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1347 struct ip_vs_scheduler *scheduler);
1348 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1349 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1350 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1351 extern struct ip_vs_conn *
1352 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1353 struct ip_vs_proto_data *pd, int *ignored,
1354 struct ip_vs_iphdr *iph);
1355 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1356 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1357
1358 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1359
1360
1361 /*
1362 * IPVS control data and functions (from ip_vs_ctl.c)
1363 */
1364 extern struct ip_vs_stats ip_vs_stats;
1365 extern int sysctl_ip_vs_sync_ver;
1366
1367 extern struct ip_vs_service *
1368 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1369 const union nf_inet_addr *vaddr, __be16 vport);
1370
1371 static inline void ip_vs_service_put(struct ip_vs_service *svc)
1372 {
1373 atomic_dec(&svc->usecnt);
1374 }
1375
1376 extern struct ip_vs_dest *
1377 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1378 const union nf_inet_addr *daddr, __be16 dport);
1379
1380 extern int ip_vs_use_count_inc(void);
1381 extern void ip_vs_use_count_dec(void);
1382 extern int ip_vs_register_nl_ioctl(void);
1383 extern void ip_vs_unregister_nl_ioctl(void);
1384 extern int ip_vs_control_init(void);
1385 extern void ip_vs_control_cleanup(void);
1386 extern struct ip_vs_dest *
1387 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1388 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1389 __u16 protocol, __u32 fwmark, __u32 flags);
1390 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1391
1392
1393 /*
1394 * IPVS sync daemon data and function prototypes
1395 * (from ip_vs_sync.c)
1396 */
1397 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1398 __u8 syncid);
1399 extern int stop_sync_thread(struct net *net, int state);
1400 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1401
1402
1403 /*
1404 * IPVS rate estimator prototypes (from ip_vs_est.c)
1405 */
1406 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1407 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1408 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1409 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1410 struct ip_vs_stats *stats);
1411
1412 /*
1413 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1414 */
1415 extern int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1416 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1417 extern int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1418 struct ip_vs_protocol *pp,
1419 struct ip_vs_iphdr *iph);
1420 extern int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1421 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1422 extern int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1423 struct ip_vs_protocol *pp,
1424 struct ip_vs_iphdr *iph);
1425 extern int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1426 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1427 extern int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1428 struct ip_vs_protocol *pp, int offset,
1429 unsigned int hooknum, struct ip_vs_iphdr *iph);
1430
1431 #ifdef CONFIG_IP_VS_IPV6
1432 extern int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1433 struct ip_vs_protocol *pp,
1434 struct ip_vs_iphdr *iph);
1435 extern int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1436 struct ip_vs_protocol *pp,
1437 struct ip_vs_iphdr *iph);
1438 extern int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1439 struct ip_vs_protocol *pp,
1440 struct ip_vs_iphdr *iph);
1441 extern int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1442 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1443 extern int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, int offset,
1445 unsigned int hooknum, struct ip_vs_iphdr *iph);
1446 #endif
1447
1448 #ifdef CONFIG_SYSCTL
1449 /*
1450 * This is a simple mechanism to ignore packets when
1451 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1452 * we start to drop 1/rate of the packets
1453 */
1454
1455 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1456 {
1457 if (!ipvs->drop_rate)
1458 return 0;
1459 if (--ipvs->drop_counter > 0)
1460 return 0;
1461 ipvs->drop_counter = ipvs->drop_rate;
1462 return 1;
1463 }
1464 #else
1465 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1466 #endif
1467
1468 /*
1469 * ip_vs_fwd_tag returns the forwarding tag of the connection
1470 */
1471 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1472
1473 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1474 {
1475 char fwd;
1476
1477 switch (IP_VS_FWD_METHOD(cp)) {
1478 case IP_VS_CONN_F_MASQ:
1479 fwd = 'M'; break;
1480 case IP_VS_CONN_F_LOCALNODE:
1481 fwd = 'L'; break;
1482 case IP_VS_CONN_F_TUNNEL:
1483 fwd = 'T'; break;
1484 case IP_VS_CONN_F_DROUTE:
1485 fwd = 'R'; break;
1486 case IP_VS_CONN_F_BYPASS:
1487 fwd = 'B'; break;
1488 default:
1489 fwd = '?'; break;
1490 }
1491 return fwd;
1492 }
1493
1494 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1495 struct ip_vs_conn *cp, int dir);
1496
1497 #ifdef CONFIG_IP_VS_IPV6
1498 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1499 struct ip_vs_conn *cp, int dir);
1500 #endif
1501
1502 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1503
1504 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1505 {
1506 __be32 diff[2] = { ~old, new };
1507
1508 return csum_partial(diff, sizeof(diff), oldsum);
1509 }
1510
1511 #ifdef CONFIG_IP_VS_IPV6
1512 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1513 __wsum oldsum)
1514 {
1515 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1516 new[3], new[2], new[1], new[0] };
1517
1518 return csum_partial(diff, sizeof(diff), oldsum);
1519 }
1520 #endif
1521
1522 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1523 {
1524 __be16 diff[2] = { ~old, new };
1525
1526 return csum_partial(diff, sizeof(diff), oldsum);
1527 }
1528
1529 /*
1530 * Forget current conntrack (unconfirmed) and attach notrack entry
1531 */
1532 static inline void ip_vs_notrack(struct sk_buff *skb)
1533 {
1534 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1535 enum ip_conntrack_info ctinfo;
1536 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1537
1538 if (!ct || !nf_ct_is_untracked(ct)) {
1539 nf_conntrack_put(skb->nfct);
1540 skb->nfct = &nf_ct_untracked_get()->ct_general;
1541 skb->nfctinfo = IP_CT_NEW;
1542 nf_conntrack_get(skb->nfct);
1543 }
1544 #endif
1545 }
1546
1547 #ifdef CONFIG_IP_VS_NFCT
1548 /*
1549 * Netfilter connection tracking
1550 * (from ip_vs_nfct.c)
1551 */
1552 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1553 {
1554 #ifdef CONFIG_SYSCTL
1555 return ipvs->sysctl_conntrack;
1556 #else
1557 return 0;
1558 #endif
1559 }
1560
1561 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1562 int outin);
1563 extern int ip_vs_confirm_conntrack(struct sk_buff *skb);
1564 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1565 struct ip_vs_conn *cp, u_int8_t proto,
1566 const __be16 port, int from_rs);
1567 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1568
1569 #else
1570
1571 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1572 {
1573 return 0;
1574 }
1575
1576 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1577 struct ip_vs_conn *cp, int outin)
1578 {
1579 }
1580
1581 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1582 {
1583 return NF_ACCEPT;
1584 }
1585
1586 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1587 {
1588 }
1589 /* CONFIG_IP_VS_NFCT */
1590 #endif
1591
1592 static inline unsigned int
1593 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1594 {
1595 /*
1596 * We think the overhead of processing active connections is 256
1597 * times higher than that of inactive connections in average. (This
1598 * 256 times might not be accurate, we will change it later) We
1599 * use the following formula to estimate the overhead now:
1600 * dest->activeconns*256 + dest->inactconns
1601 */
1602 return (atomic_read(&dest->activeconns) << 8) +
1603 atomic_read(&dest->inactconns);
1604 }
1605
1606 #endif /* _NET_IP_VS_H */
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