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net: skb_segment() provides list head and tail
[linux/fpc-iii.git] / include / net / ip_vs.h
blob615b20b585452111a25085890d8fa875657dbe76
1 /* IP Virtual Server
2 * data structure and functionality definitions
3 */
4
5 #ifndef _NET_IP_VS_H
6 #define _NET_IP_VS_H
7
8 #include <linux/ip_vs.h> /* definitions shared with userland */
9
10 #include <asm/types.h> /* for __uXX types */
11
12 #include <linux/list.h> /* for struct list_head */
13 #include <linux/spinlock.h> /* for struct rwlock_t */
14 #include <linux/atomic.h> /* for struct atomic_t */
15 #include <linux/compiler.h>
16 #include <linux/timer.h>
17 #include <linux/bug.h>
18
19 #include <net/checksum.h>
20 #include <linux/netfilter.h> /* for union nf_inet_addr */
21 #include <linux/ip.h>
22 #include <linux/ipv6.h> /* for struct ipv6hdr */
23 #include <net/ipv6.h>
24 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
25 #include <linux/netfilter_ipv6/ip6_tables.h>
26 #endif
27 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
28 #include <net/netfilter/nf_conntrack.h>
29 #endif
30 #include <net/net_namespace.h> /* Netw namespace */
31
32 /* Generic access of ipvs struct */
33 static inline struct netns_ipvs *net_ipvs(struct net* net)
34 {
35 return net->ipvs;
36 }
37
38 /* Get net ptr from skb in traffic cases
39 * use skb_sknet when call is from userland (ioctl or netlink)
40 */
41 static inline struct net *skb_net(const struct sk_buff *skb)
42 {
43 #ifdef CONFIG_NET_NS
44 #ifdef CONFIG_IP_VS_DEBUG
45 /*
46 * This is used for debug only.
47 * Start with the most likely hit
48 * End with BUG
49 */
50 if (likely(skb->dev && skb->dev->nd_net))
51 return dev_net(skb->dev);
52 if (skb_dst(skb) && skb_dst(skb)->dev)
53 return dev_net(skb_dst(skb)->dev);
54 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
55 __func__, __LINE__);
56 if (likely(skb->sk && skb->sk->sk_net))
57 return sock_net(skb->sk);
58 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
59 __func__, __LINE__);
60 BUG();
61 #else
62 return dev_net(skb->dev ? : skb_dst(skb)->dev);
63 #endif
64 #else
65 return &init_net;
66 #endif
67 }
68
69 static inline struct net *skb_sknet(const struct sk_buff *skb)
70 {
71 #ifdef CONFIG_NET_NS
72 #ifdef CONFIG_IP_VS_DEBUG
73 /* Start with the most likely hit */
74 if (likely(skb->sk && skb->sk->sk_net))
75 return sock_net(skb->sk);
76 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
77 __func__, __LINE__);
78 if (likely(skb->dev && skb->dev->nd_net))
79 return dev_net(skb->dev);
80 pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
81 __func__, __LINE__);
82 BUG();
83 #else
84 return sock_net(skb->sk);
85 #endif
86 #else
87 return &init_net;
88 #endif
89 }
90
91 /* This one needed for single_open_net since net is stored directly in
92 * private not as a struct i.e. seq_file_net can't be used.
93 */
94 static inline struct net *seq_file_single_net(struct seq_file *seq)
95 {
96 #ifdef CONFIG_NET_NS
97 return (struct net *)seq->private;
98 #else
99 return &init_net;
100 #endif
101 }
102
103 /* Connections' size value needed by ip_vs_ctl.c */
104 extern int ip_vs_conn_tab_size;
105
106 struct ip_vs_iphdr {
107 __u32 len; /* IPv4 simply where L4 starts
108 * IPv6 where L4 Transport Header starts */
109 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
110 __s16 protocol;
111 __s32 flags;
112 union nf_inet_addr saddr;
113 union nf_inet_addr daddr;
114 };
115
116 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
117 int len, void *buffer,
118 const struct ip_vs_iphdr *ipvsh)
119 {
120 return skb_header_pointer(skb, offset, len, buffer);
121 }
122
123 static inline void
124 ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
125 {
126 const struct iphdr *iph = nh;
127
128 iphdr->len = iph->ihl * 4;
129 iphdr->fragoffs = 0;
130 iphdr->protocol = iph->protocol;
131 iphdr->saddr.ip = iph->saddr;
132 iphdr->daddr.ip = iph->daddr;
133 }
134
135 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
136 * IPv6 requires some extra work, as finding proper header position,
137 * depend on the IPv6 extension headers.
138 */
139 static inline void
140 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
141 {
142 #ifdef CONFIG_IP_VS_IPV6
143 if (af == AF_INET6) {
144 const struct ipv6hdr *iph =
145 (struct ipv6hdr *)skb_network_header(skb);
146 iphdr->saddr.in6 = iph->saddr;
147 iphdr->daddr.in6 = iph->daddr;
148 /* ipv6_find_hdr() updates len, flags */
149 iphdr->len = 0;
150 iphdr->flags = 0;
151 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
152 &iphdr->fragoffs,
153 &iphdr->flags);
154 } else
155 #endif
156 {
157 const struct iphdr *iph =
158 (struct iphdr *)skb_network_header(skb);
159 iphdr->len = iph->ihl * 4;
160 iphdr->fragoffs = 0;
161 iphdr->protocol = iph->protocol;
162 iphdr->saddr.ip = iph->saddr;
163 iphdr->daddr.ip = iph->daddr;
164 }
165 }
166
167 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
168 const union nf_inet_addr *src)
169 {
170 #ifdef CONFIG_IP_VS_IPV6
171 if (af == AF_INET6)
172 dst->in6 = src->in6;
173 else
174 #endif
175 dst->ip = src->ip;
176 }
177
178 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
179 const union nf_inet_addr *src)
180 {
181 #ifdef CONFIG_IP_VS_IPV6
182 if (af == AF_INET6) {
183 dst->in6 = src->in6;
184 return;
185 }
186 #endif
187 dst->ip = src->ip;
188 dst->all[1] = 0;
189 dst->all[2] = 0;
190 dst->all[3] = 0;
191 }
192
193 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
194 const union nf_inet_addr *b)
195 {
196 #ifdef CONFIG_IP_VS_IPV6
197 if (af == AF_INET6)
198 return ipv6_addr_equal(&a->in6, &b->in6);
199 #endif
200 return a->ip == b->ip;
201 }
202
203 #ifdef CONFIG_IP_VS_DEBUG
204 #include <linux/net.h>
205
206 int ip_vs_get_debug_level(void);
207
208 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
209 const union nf_inet_addr *addr,
210 int *idx)
211 {
212 int len;
213 #ifdef CONFIG_IP_VS_IPV6
214 if (af == AF_INET6)
215 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
216 &addr->in6) + 1;
217 else
218 #endif
219 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
220 &addr->ip) + 1;
221
222 *idx += len;
223 BUG_ON(*idx > buf_len + 1);
224 return &buf[*idx - len];
225 }
226
227 #define IP_VS_DBG_BUF(level, msg, ...) \
228 do { \
229 char ip_vs_dbg_buf[160]; \
230 int ip_vs_dbg_idx = 0; \
231 if (level <= ip_vs_get_debug_level()) \
232 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
233 } while (0)
234 #define IP_VS_ERR_BUF(msg...) \
235 do { \
236 char ip_vs_dbg_buf[160]; \
237 int ip_vs_dbg_idx = 0; \
238 pr_err(msg); \
239 } while (0)
240
241 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
242 #define IP_VS_DBG_ADDR(af, addr) \
243 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
244 sizeof(ip_vs_dbg_buf), addr, \
245 &ip_vs_dbg_idx)
246
247 #define IP_VS_DBG(level, msg, ...) \
248 do { \
249 if (level <= ip_vs_get_debug_level()) \
250 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
251 } while (0)
252 #define IP_VS_DBG_RL(msg, ...) \
253 do { \
254 if (net_ratelimit()) \
255 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
256 } while (0)
257 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
258 do { \
259 if (level <= ip_vs_get_debug_level()) \
260 pp->debug_packet(af, pp, skb, ofs, msg); \
261 } while (0)
262 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
263 do { \
264 if (level <= ip_vs_get_debug_level() && \
265 net_ratelimit()) \
266 pp->debug_packet(af, pp, skb, ofs, msg); \
267 } while (0)
268 #else /* NO DEBUGGING at ALL */
269 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
270 #define IP_VS_ERR_BUF(msg...) do {} while (0)
271 #define IP_VS_DBG(level, msg...) do {} while (0)
272 #define IP_VS_DBG_RL(msg...) do {} while (0)
273 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
274 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
275 #endif
276
277 #define IP_VS_BUG() BUG()
278 #define IP_VS_ERR_RL(msg, ...) \
279 do { \
280 if (net_ratelimit()) \
281 pr_err(msg, ##__VA_ARGS__); \
282 } while (0)
283
284 #ifdef CONFIG_IP_VS_DEBUG
285 #define EnterFunction(level) \
286 do { \
287 if (level <= ip_vs_get_debug_level()) \
288 printk(KERN_DEBUG \
289 pr_fmt("Enter: %s, %s line %i\n"), \
290 __func__, __FILE__, __LINE__); \
291 } while (0)
292 #define LeaveFunction(level) \
293 do { \
294 if (level <= ip_vs_get_debug_level()) \
295 printk(KERN_DEBUG \
296 pr_fmt("Leave: %s, %s line %i\n"), \
297 __func__, __FILE__, __LINE__); \
298 } while (0)
299 #else
300 #define EnterFunction(level) do {} while (0)
301 #define LeaveFunction(level) do {} while (0)
302 #endif
303
304 /* The port number of FTP service (in network order). */
305 #define FTPPORT cpu_to_be16(21)
306 #define FTPDATA cpu_to_be16(20)
307
308 /* TCP State Values */
309 enum {
310 IP_VS_TCP_S_NONE = 0,
311 IP_VS_TCP_S_ESTABLISHED,
312 IP_VS_TCP_S_SYN_SENT,
313 IP_VS_TCP_S_SYN_RECV,
314 IP_VS_TCP_S_FIN_WAIT,
315 IP_VS_TCP_S_TIME_WAIT,
316 IP_VS_TCP_S_CLOSE,
317 IP_VS_TCP_S_CLOSE_WAIT,
318 IP_VS_TCP_S_LAST_ACK,
319 IP_VS_TCP_S_LISTEN,
320 IP_VS_TCP_S_SYNACK,
321 IP_VS_TCP_S_LAST
322 };
323
324 /* UDP State Values */
325 enum {
326 IP_VS_UDP_S_NORMAL,
327 IP_VS_UDP_S_LAST,
328 };
329
330 /* ICMP State Values */
331 enum {
332 IP_VS_ICMP_S_NORMAL,
333 IP_VS_ICMP_S_LAST,
334 };
335
336 /* SCTP State Values */
337 enum ip_vs_sctp_states {
338 IP_VS_SCTP_S_NONE,
339 IP_VS_SCTP_S_INIT1,
340 IP_VS_SCTP_S_INIT,
341 IP_VS_SCTP_S_COOKIE_SENT,
342 IP_VS_SCTP_S_COOKIE_REPLIED,
343 IP_VS_SCTP_S_COOKIE_WAIT,
344 IP_VS_SCTP_S_COOKIE,
345 IP_VS_SCTP_S_COOKIE_ECHOED,
346 IP_VS_SCTP_S_ESTABLISHED,
347 IP_VS_SCTP_S_SHUTDOWN_SENT,
348 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
349 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
350 IP_VS_SCTP_S_REJECTED,
351 IP_VS_SCTP_S_CLOSED,
352 IP_VS_SCTP_S_LAST
353 };
354
355 /* Delta sequence info structure
356 * Each ip_vs_conn has 2 (output AND input seq. changes).
357 * Only used in the VS/NAT.
358 */
359 struct ip_vs_seq {
360 __u32 init_seq; /* Add delta from this seq */
361 __u32 delta; /* Delta in sequence numbers */
362 __u32 previous_delta; /* Delta in sequence numbers
363 * before last resized pkt */
364 };
365
366 /* counters per cpu */
367 struct ip_vs_counters {
368 __u32 conns; /* connections scheduled */
369 __u32 inpkts; /* incoming packets */
370 __u32 outpkts; /* outgoing packets */
371 __u64 inbytes; /* incoming bytes */
372 __u64 outbytes; /* outgoing bytes */
373 };
374 /* Stats per cpu */
375 struct ip_vs_cpu_stats {
376 struct ip_vs_counters ustats;
377 struct u64_stats_sync syncp;
378 };
379
380 /* IPVS statistics objects */
381 struct ip_vs_estimator {
382 struct list_head list;
383
384 u64 last_inbytes;
385 u64 last_outbytes;
386 u32 last_conns;
387 u32 last_inpkts;
388 u32 last_outpkts;
389
390 u32 cps;
391 u32 inpps;
392 u32 outpps;
393 u32 inbps;
394 u32 outbps;
395 };
396
397 struct ip_vs_stats {
398 struct ip_vs_stats_user ustats; /* statistics */
399 struct ip_vs_estimator est; /* estimator */
400 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
401 spinlock_t lock; /* spin lock */
402 struct ip_vs_stats_user ustats0; /* reset values */
403 };
404
405 struct dst_entry;
406 struct iphdr;
407 struct ip_vs_conn;
408 struct ip_vs_app;
409 struct sk_buff;
410 struct ip_vs_proto_data;
411
412 struct ip_vs_protocol {
413 struct ip_vs_protocol *next;
414 char *name;
415 u16 protocol;
416 u16 num_states;
417 int dont_defrag;
418
419 void (*init)(struct ip_vs_protocol *pp);
420
421 void (*exit)(struct ip_vs_protocol *pp);
422
423 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
424
425 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
426
427 int (*conn_schedule)(int af, struct sk_buff *skb,
428 struct ip_vs_proto_data *pd,
429 int *verdict, struct ip_vs_conn **cpp,
430 struct ip_vs_iphdr *iph);
431
432 struct ip_vs_conn *
433 (*conn_in_get)(int af,
434 const struct sk_buff *skb,
435 const struct ip_vs_iphdr *iph,
436 int inverse);
437
438 struct ip_vs_conn *
439 (*conn_out_get)(int af,
440 const struct sk_buff *skb,
441 const struct ip_vs_iphdr *iph,
442 int inverse);
443
444 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
445 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
446
447 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
448 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
449
450 int (*csum_check)(int af, struct sk_buff *skb,
451 struct ip_vs_protocol *pp);
452
453 const char *(*state_name)(int state);
454
455 void (*state_transition)(struct ip_vs_conn *cp, int direction,
456 const struct sk_buff *skb,
457 struct ip_vs_proto_data *pd);
458
459 int (*register_app)(struct net *net, struct ip_vs_app *inc);
460
461 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
462
463 int (*app_conn_bind)(struct ip_vs_conn *cp);
464
465 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
466 const struct sk_buff *skb,
467 int offset,
468 const char *msg);
469
470 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
471 };
472
473 /* protocol data per netns */
474 struct ip_vs_proto_data {
475 struct ip_vs_proto_data *next;
476 struct ip_vs_protocol *pp;
477 int *timeout_table; /* protocol timeout table */
478 atomic_t appcnt; /* counter of proto app incs. */
479 struct tcp_states_t *tcp_state_table;
480 };
481
482 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
483 struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
484 unsigned short proto);
485
486 struct ip_vs_conn_param {
487 struct net *net;
488 const union nf_inet_addr *caddr;
489 const union nf_inet_addr *vaddr;
490 __be16 cport;
491 __be16 vport;
492 __u16 protocol;
493 u16 af;
494
495 const struct ip_vs_pe *pe;
496 char *pe_data;
497 __u8 pe_data_len;
498 };
499
500 /* IP_VS structure allocated for each dynamically scheduled connection */
501 struct ip_vs_conn {
502 struct hlist_node c_list; /* hashed list heads */
503 /* Protocol, addresses and port numbers */
504 __be16 cport;
505 __be16 dport;
506 __be16 vport;
507 u16 af; /* address family */
508 union nf_inet_addr caddr; /* client address */
509 union nf_inet_addr vaddr; /* virtual address */
510 union nf_inet_addr daddr; /* destination address */
511 volatile __u32 flags; /* status flags */
512 __u16 protocol; /* Which protocol (TCP/UDP) */
513 __u16 daf; /* Address family of the dest */
514 #ifdef CONFIG_NET_NS
515 struct net *net; /* Name space */
516 #endif
517
518 /* counter and timer */
519 atomic_t refcnt; /* reference count */
520 struct timer_list timer; /* Expiration timer */
521 volatile unsigned long timeout; /* timeout */
522
523 /* Flags and state transition */
524 spinlock_t lock; /* lock for state transition */
525 volatile __u16 state; /* state info */
526 volatile __u16 old_state; /* old state, to be used for
527 * state transition triggerd
528 * synchronization
529 */
530 __u32 fwmark; /* Fire wall mark from skb */
531 unsigned long sync_endtime; /* jiffies + sent_retries */
532
533 /* Control members */
534 struct ip_vs_conn *control; /* Master control connection */
535 atomic_t n_control; /* Number of controlled ones */
536 struct ip_vs_dest *dest; /* real server */
537 atomic_t in_pkts; /* incoming packet counter */
538
539 /* Packet transmitter for different forwarding methods. If it
540 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
541 * otherwise this must be changed to a sk_buff **.
542 * NF_ACCEPT can be returned when destination is local.
543 */
544 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
545 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
546
547 /* Note: we can group the following members into a structure,
548 * in order to save more space, and the following members are
549 * only used in VS/NAT anyway
550 */
551 struct ip_vs_app *app; /* bound ip_vs_app object */
552 void *app_data; /* Application private data */
553 struct ip_vs_seq in_seq; /* incoming seq. struct */
554 struct ip_vs_seq out_seq; /* outgoing seq. struct */
555
556 const struct ip_vs_pe *pe;
557 char *pe_data;
558 __u8 pe_data_len;
559
560 struct rcu_head rcu_head;
561 };
562
563 /* To save some memory in conn table when name space is disabled. */
564 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
565 {
566 #ifdef CONFIG_NET_NS
567 return cp->net;
568 #else
569 return &init_net;
570 #endif
571 }
572
573 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
574 {
575 #ifdef CONFIG_NET_NS
576 cp->net = net;
577 #endif
578 }
579
580 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
581 struct net *net)
582 {
583 #ifdef CONFIG_NET_NS
584 return cp->net == net;
585 #else
586 return 1;
587 #endif
588 }
589
590 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
591 * for IPv6 support.
592 *
593 * We need these to conveniently pass around service and destination
594 * options, but unfortunately, we also need to keep the old definitions to
595 * maintain userspace backwards compatibility for the setsockopt interface.
596 */
597 struct ip_vs_service_user_kern {
598 /* virtual service addresses */
599 u16 af;
600 u16 protocol;
601 union nf_inet_addr addr; /* virtual ip address */
602 __be16 port;
603 u32 fwmark; /* firwall mark of service */
604
605 /* virtual service options */
606 char *sched_name;
607 char *pe_name;
608 unsigned int flags; /* virtual service flags */
609 unsigned int timeout; /* persistent timeout in sec */
610 __be32 netmask; /* persistent netmask or plen */
611 };
612
613
614 struct ip_vs_dest_user_kern {
615 /* destination server address */
616 union nf_inet_addr addr;
617 __be16 port;
618
619 /* real server options */
620 unsigned int conn_flags; /* connection flags */
621 int weight; /* destination weight */
622
623 /* thresholds for active connections */
624 u32 u_threshold; /* upper threshold */
625 u32 l_threshold; /* lower threshold */
626
627 /* Address family of addr */
628 u16 af;
629 };
630
631
632 /*
633 * The information about the virtual service offered to the net and the
634 * forwarding entries.
635 */
636 struct ip_vs_service {
637 struct hlist_node s_list; /* for normal service table */
638 struct hlist_node f_list; /* for fwmark-based service table */
639 atomic_t refcnt; /* reference counter */
640
641 u16 af; /* address family */
642 __u16 protocol; /* which protocol (TCP/UDP) */
643 union nf_inet_addr addr; /* IP address for virtual service */
644 __be16 port; /* port number for the service */
645 __u32 fwmark; /* firewall mark of the service */
646 unsigned int flags; /* service status flags */
647 unsigned int timeout; /* persistent timeout in ticks */
648 __be32 netmask; /* grouping granularity, mask/plen */
649 struct net *net;
650
651 struct list_head destinations; /* real server d-linked list */
652 __u32 num_dests; /* number of servers */
653 struct ip_vs_stats stats; /* statistics for the service */
654
655 /* for scheduling */
656 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
657 spinlock_t sched_lock; /* lock sched_data */
658 void *sched_data; /* scheduler application data */
659
660 /* alternate persistence engine */
661 struct ip_vs_pe __rcu *pe;
662
663 struct rcu_head rcu_head;
664 };
665
666 /* Information for cached dst */
667 struct ip_vs_dest_dst {
668 struct dst_entry *dst_cache; /* destination cache entry */
669 u32 dst_cookie;
670 union nf_inet_addr dst_saddr;
671 struct rcu_head rcu_head;
672 };
673
674 /* The real server destination forwarding entry with ip address, port number,
675 * and so on.
676 */
677 struct ip_vs_dest {
678 struct list_head n_list; /* for the dests in the service */
679 struct hlist_node d_list; /* for table with all the dests */
680
681 u16 af; /* address family */
682 __be16 port; /* port number of the server */
683 union nf_inet_addr addr; /* IP address of the server */
684 volatile unsigned int flags; /* dest status flags */
685 atomic_t conn_flags; /* flags to copy to conn */
686 atomic_t weight; /* server weight */
687
688 atomic_t refcnt; /* reference counter */
689 struct ip_vs_stats stats; /* statistics */
690 unsigned long idle_start; /* start time, jiffies */
691
692 /* connection counters and thresholds */
693 atomic_t activeconns; /* active connections */
694 atomic_t inactconns; /* inactive connections */
695 atomic_t persistconns; /* persistent connections */
696 __u32 u_threshold; /* upper threshold */
697 __u32 l_threshold; /* lower threshold */
698
699 /* for destination cache */
700 spinlock_t dst_lock; /* lock of dst_cache */
701 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
702
703 /* for virtual service */
704 struct ip_vs_service __rcu *svc; /* service it belongs to */
705 __u16 protocol; /* which protocol (TCP/UDP) */
706 __be16 vport; /* virtual port number */
707 union nf_inet_addr vaddr; /* virtual IP address */
708 __u32 vfwmark; /* firewall mark of service */
709
710 struct list_head t_list; /* in dest_trash */
711 unsigned int in_rs_table:1; /* we are in rs_table */
712 };
713
714 /* The scheduler object */
715 struct ip_vs_scheduler {
716 struct list_head n_list; /* d-linked list head */
717 char *name; /* scheduler name */
718 atomic_t refcnt; /* reference counter */
719 struct module *module; /* THIS_MODULE/NULL */
720
721 /* scheduler initializing service */
722 int (*init_service)(struct ip_vs_service *svc);
723 /* scheduling service finish */
724 void (*done_service)(struct ip_vs_service *svc);
725 /* dest is linked */
726 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
727 /* dest is unlinked */
728 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
729 /* dest is updated */
730 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
731
732 /* selecting a server from the given service */
733 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
734 const struct sk_buff *skb,
735 struct ip_vs_iphdr *iph);
736 };
737
738 /* The persistence engine object */
739 struct ip_vs_pe {
740 struct list_head n_list; /* d-linked list head */
741 char *name; /* scheduler name */
742 atomic_t refcnt; /* reference counter */
743 struct module *module; /* THIS_MODULE/NULL */
744
745 /* get the connection template, if any */
746 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
747 bool (*ct_match)(const struct ip_vs_conn_param *p,
748 struct ip_vs_conn *ct);
749 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
750 bool inverse);
751 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
752 };
753
754 /* The application module object (a.k.a. app incarnation) */
755 struct ip_vs_app {
756 struct list_head a_list; /* member in app list */
757 int type; /* IP_VS_APP_TYPE_xxx */
758 char *name; /* application module name */
759 __u16 protocol;
760 struct module *module; /* THIS_MODULE/NULL */
761 struct list_head incs_list; /* list of incarnations */
762
763 /* members for application incarnations */
764 struct list_head p_list; /* member in proto app list */
765 struct ip_vs_app *app; /* its real application */
766 __be16 port; /* port number in net order */
767 atomic_t usecnt; /* usage counter */
768 struct rcu_head rcu_head;
769
770 /* output hook: Process packet in inout direction, diff set for TCP.
771 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
772 * 2=Mangled but checksum was not updated
773 */
774 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
775 struct sk_buff *, int *diff);
776
777 /* input hook: Process packet in outin direction, diff set for TCP.
778 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
779 * 2=Mangled but checksum was not updated
780 */
781 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
782 struct sk_buff *, int *diff);
783
784 /* ip_vs_app initializer */
785 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
786
787 /* ip_vs_app finish */
788 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
789
790
791 /* not used now */
792 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
793 struct ip_vs_protocol *);
794
795 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
796
797 int * timeout_table;
798 int * timeouts;
799 int timeouts_size;
800
801 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
802 int *verdict, struct ip_vs_conn **cpp);
803
804 struct ip_vs_conn *
805 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
806 const struct iphdr *iph, int inverse);
807
808 struct ip_vs_conn *
809 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
810 const struct iphdr *iph, int inverse);
811
812 int (*state_transition)(struct ip_vs_conn *cp, int direction,
813 const struct sk_buff *skb,
814 struct ip_vs_app *app);
815
816 void (*timeout_change)(struct ip_vs_app *app, int flags);
817 };
818
819 struct ipvs_master_sync_state {
820 struct list_head sync_queue;
821 struct ip_vs_sync_buff *sync_buff;
822 unsigned long sync_queue_len;
823 unsigned int sync_queue_delay;
824 struct task_struct *master_thread;
825 struct delayed_work master_wakeup_work;
826 struct netns_ipvs *ipvs;
827 };
828
829 /* How much time to keep dests in trash */
830 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
831
832 /* IPVS in network namespace */
833 struct netns_ipvs {
834 int gen; /* Generation */
835 int enable; /* enable like nf_hooks do */
836 /* Hash table: for real service lookups */
837 #define IP_VS_RTAB_BITS 4
838 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
839 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
840
841 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
842 /* ip_vs_app */
843 struct list_head app_list;
844 /* ip_vs_proto */
845 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
846 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
847 /* ip_vs_proto_tcp */
848 #ifdef CONFIG_IP_VS_PROTO_TCP
849 #define TCP_APP_TAB_BITS 4
850 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
851 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
852 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
853 #endif
854 /* ip_vs_proto_udp */
855 #ifdef CONFIG_IP_VS_PROTO_UDP
856 #define UDP_APP_TAB_BITS 4
857 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
858 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
859 struct list_head udp_apps[UDP_APP_TAB_SIZE];
860 #endif
861 /* ip_vs_proto_sctp */
862 #ifdef CONFIG_IP_VS_PROTO_SCTP
863 #define SCTP_APP_TAB_BITS 4
864 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
865 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
866 /* Hash table for SCTP application incarnations */
867 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
868 #endif
869 /* ip_vs_conn */
870 atomic_t conn_count; /* connection counter */
871
872 /* ip_vs_ctl */
873 struct ip_vs_stats tot_stats; /* Statistics & est. */
874
875 int num_services; /* no of virtual services */
876
877 /* Trash for destinations */
878 struct list_head dest_trash;
879 spinlock_t dest_trash_lock;
880 struct timer_list dest_trash_timer; /* expiration timer */
881 /* Service counters */
882 atomic_t ftpsvc_counter;
883 atomic_t nullsvc_counter;
884
885 #ifdef CONFIG_SYSCTL
886 /* 1/rate drop and drop-entry variables */
887 struct delayed_work defense_work; /* Work handler */
888 int drop_rate;
889 int drop_counter;
890 atomic_t dropentry;
891 /* locks in ctl.c */
892 spinlock_t dropentry_lock; /* drop entry handling */
893 spinlock_t droppacket_lock; /* drop packet handling */
894 spinlock_t securetcp_lock; /* state and timeout tables */
895
896 /* sys-ctl struct */
897 struct ctl_table_header *sysctl_hdr;
898 struct ctl_table *sysctl_tbl;
899 #endif
900
901 /* sysctl variables */
902 int sysctl_amemthresh;
903 int sysctl_am_droprate;
904 int sysctl_drop_entry;
905 int sysctl_drop_packet;
906 int sysctl_secure_tcp;
907 #ifdef CONFIG_IP_VS_NFCT
908 int sysctl_conntrack;
909 #endif
910 int sysctl_snat_reroute;
911 int sysctl_sync_ver;
912 int sysctl_sync_ports;
913 int sysctl_sync_persist_mode;
914 unsigned long sysctl_sync_qlen_max;
915 int sysctl_sync_sock_size;
916 int sysctl_cache_bypass;
917 int sysctl_expire_nodest_conn;
918 int sysctl_sloppy_tcp;
919 int sysctl_sloppy_sctp;
920 int sysctl_expire_quiescent_template;
921 int sysctl_sync_threshold[2];
922 unsigned int sysctl_sync_refresh_period;
923 int sysctl_sync_retries;
924 int sysctl_nat_icmp_send;
925 int sysctl_pmtu_disc;
926 int sysctl_backup_only;
927
928 /* ip_vs_lblc */
929 int sysctl_lblc_expiration;
930 struct ctl_table_header *lblc_ctl_header;
931 struct ctl_table *lblc_ctl_table;
932 /* ip_vs_lblcr */
933 int sysctl_lblcr_expiration;
934 struct ctl_table_header *lblcr_ctl_header;
935 struct ctl_table *lblcr_ctl_table;
936 /* ip_vs_est */
937 struct list_head est_list; /* estimator list */
938 spinlock_t est_lock;
939 struct timer_list est_timer; /* Estimation timer */
940 /* ip_vs_sync */
941 spinlock_t sync_lock;
942 struct ipvs_master_sync_state *ms;
943 spinlock_t sync_buff_lock;
944 struct task_struct **backup_threads;
945 int threads_mask;
946 int send_mesg_maxlen;
947 int recv_mesg_maxlen;
948 volatile int sync_state;
949 volatile int master_syncid;
950 volatile int backup_syncid;
951 struct mutex sync_mutex;
952 /* multicast interface name */
953 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
954 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
955 /* net name space ptr */
956 struct net *net; /* Needed by timer routines */
957 /* Number of heterogeneous destinations, needed becaus heterogeneous
958 * are not supported when synchronization is enabled.
959 */
960 unsigned int mixed_address_family_dests;
961 };
962
963 #define DEFAULT_SYNC_THRESHOLD 3
964 #define DEFAULT_SYNC_PERIOD 50
965 #define DEFAULT_SYNC_VER 1
966 #define DEFAULT_SLOPPY_TCP 0
967 #define DEFAULT_SLOPPY_SCTP 0
968 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
969 #define DEFAULT_SYNC_RETRIES 0
970 #define IPVS_SYNC_WAKEUP_RATE 8
971 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
972 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
973 #define IPVS_SYNC_CHECK_PERIOD HZ
974 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
975 #define IPVS_SYNC_PORTS_MAX (1 << 6)
976
977 #ifdef CONFIG_SYSCTL
978
979 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
980 {
981 return ipvs->sysctl_sync_threshold[0];
982 }
983
984 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
985 {
986 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
987 }
988
989 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
990 {
991 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
992 }
993
994 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
995 {
996 return ipvs->sysctl_sync_retries;
997 }
998
999 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1000 {
1001 return ipvs->sysctl_sync_ver;
1002 }
1003
1004 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1005 {
1006 return ipvs->sysctl_sloppy_tcp;
1007 }
1008
1009 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1010 {
1011 return ipvs->sysctl_sloppy_sctp;
1012 }
1013
1014 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1015 {
1016 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1017 }
1018
1019 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1020 {
1021 return ipvs->sysctl_sync_persist_mode;
1022 }
1023
1024 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1025 {
1026 return ipvs->sysctl_sync_qlen_max;
1027 }
1028
1029 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1030 {
1031 return ipvs->sysctl_sync_sock_size;
1032 }
1033
1034 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1035 {
1036 return ipvs->sysctl_pmtu_disc;
1037 }
1038
1039 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1040 {
1041 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1042 ipvs->sysctl_backup_only;
1043 }
1044
1045 #else
1046
1047 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1048 {
1049 return DEFAULT_SYNC_THRESHOLD;
1050 }
1051
1052 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1053 {
1054 return DEFAULT_SYNC_PERIOD;
1055 }
1056
1057 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1058 {
1059 return DEFAULT_SYNC_REFRESH_PERIOD;
1060 }
1061
1062 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1063 {
1064 return DEFAULT_SYNC_RETRIES & 3;
1065 }
1066
1067 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1068 {
1069 return DEFAULT_SYNC_VER;
1070 }
1071
1072 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1073 {
1074 return DEFAULT_SLOPPY_TCP;
1075 }
1076
1077 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1078 {
1079 return DEFAULT_SLOPPY_SCTP;
1080 }
1081
1082 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1083 {
1084 return 1;
1085 }
1086
1087 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1088 {
1089 return 0;
1090 }
1091
1092 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1093 {
1094 return IPVS_SYNC_QLEN_MAX;
1095 }
1096
1097 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1098 {
1099 return 0;
1100 }
1101
1102 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1103 {
1104 return 1;
1105 }
1106
1107 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1108 {
1109 return 0;
1110 }
1111
1112 #endif
1113
1114 /* IPVS core functions
1115 * (from ip_vs_core.c)
1116 */
1117 const char *ip_vs_proto_name(unsigned int proto);
1118 void ip_vs_init_hash_table(struct list_head *table, int rows);
1119 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1120
1121 #define IP_VS_APP_TYPE_FTP 1
1122
1123 /* ip_vs_conn handling functions
1124 * (from ip_vs_conn.c)
1125 */
1126 enum {
1127 IP_VS_DIR_INPUT = 0,
1128 IP_VS_DIR_OUTPUT,
1129 IP_VS_DIR_INPUT_ONLY,
1130 IP_VS_DIR_LAST,
1131 };
1132
1133 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1134 const union nf_inet_addr *caddr,
1135 __be16 cport,
1136 const union nf_inet_addr *vaddr,
1137 __be16 vport,
1138 struct ip_vs_conn_param *p)
1139 {
1140 p->net = net;
1141 p->af = af;
1142 p->protocol = protocol;
1143 p->caddr = caddr;
1144 p->cport = cport;
1145 p->vaddr = vaddr;
1146 p->vport = vport;
1147 p->pe = NULL;
1148 p->pe_data = NULL;
1149 }
1150
1151 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1152 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1153
1154 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1155 const struct ip_vs_iphdr *iph,
1156 int inverse);
1157
1158 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1159
1160 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1161 const struct ip_vs_iphdr *iph,
1162 int inverse);
1163
1164 /* Get reference to gain full access to conn.
1165 * By default, RCU read-side critical sections have access only to
1166 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1167 */
1168 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1169 {
1170 return atomic_inc_not_zero(&cp->refcnt);
1171 }
1172
1173 /* put back the conn without restarting its timer */
1174 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1175 {
1176 smp_mb__before_atomic();
1177 atomic_dec(&cp->refcnt);
1178 }
1179 void ip_vs_conn_put(struct ip_vs_conn *cp);
1180 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1181
1182 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1183 const union nf_inet_addr *daddr,
1184 __be16 dport, unsigned int flags,
1185 struct ip_vs_dest *dest, __u32 fwmark);
1186 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1187
1188 const char *ip_vs_state_name(__u16 proto, int state);
1189
1190 void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1191 int ip_vs_check_template(struct ip_vs_conn *ct);
1192 void ip_vs_random_dropentry(struct net *net);
1193 int ip_vs_conn_init(void);
1194 void ip_vs_conn_cleanup(void);
1195
1196 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1197 {
1198 struct ip_vs_conn *ctl_cp = cp->control;
1199 if (!ctl_cp) {
1200 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1201 "%s:%d to %s:%d\n",
1202 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1203 ntohs(cp->cport),
1204 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1205 ntohs(cp->vport));
1206
1207 return;
1208 }
1209
1210 IP_VS_DBG_BUF(7, "DELeting control for: "
1211 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1212 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1213 ntohs(cp->cport),
1214 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1215 ntohs(ctl_cp->cport));
1216
1217 cp->control = NULL;
1218 if (atomic_read(&ctl_cp->n_control) == 0) {
1219 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1220 "%s:%d to %s:%d\n",
1221 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1222 ntohs(cp->cport),
1223 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1224 ntohs(cp->vport));
1225
1226 return;
1227 }
1228 atomic_dec(&ctl_cp->n_control);
1229 }
1230
1231 static inline void
1232 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1233 {
1234 if (cp->control) {
1235 IP_VS_ERR_BUF("request control ADD for already controlled: "
1236 "%s:%d to %s:%d\n",
1237 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1238 ntohs(cp->cport),
1239 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1240 ntohs(cp->vport));
1241
1242 ip_vs_control_del(cp);
1243 }
1244
1245 IP_VS_DBG_BUF(7, "ADDing control for: "
1246 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1247 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1248 ntohs(cp->cport),
1249 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1250 ntohs(ctl_cp->cport));
1251
1252 cp->control = ctl_cp;
1253 atomic_inc(&ctl_cp->n_control);
1254 }
1255
1256 /* IPVS netns init & cleanup functions */
1257 int ip_vs_estimator_net_init(struct net *net);
1258 int ip_vs_control_net_init(struct net *net);
1259 int ip_vs_protocol_net_init(struct net *net);
1260 int ip_vs_app_net_init(struct net *net);
1261 int ip_vs_conn_net_init(struct net *net);
1262 int ip_vs_sync_net_init(struct net *net);
1263 void ip_vs_conn_net_cleanup(struct net *net);
1264 void ip_vs_app_net_cleanup(struct net *net);
1265 void ip_vs_protocol_net_cleanup(struct net *net);
1266 void ip_vs_control_net_cleanup(struct net *net);
1267 void ip_vs_estimator_net_cleanup(struct net *net);
1268 void ip_vs_sync_net_cleanup(struct net *net);
1269 void ip_vs_service_net_cleanup(struct net *net);
1270
1271 /* IPVS application functions
1272 * (from ip_vs_app.c)
1273 */
1274 #define IP_VS_APP_MAX_PORTS 8
1275 struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1276 void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1277 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1278 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1279 int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
1280 __u16 port);
1281 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1282 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1283
1284 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1285 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1286
1287 int register_ip_vs_pe(struct ip_vs_pe *pe);
1288 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1289 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1290 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1291
1292 /* Use a #define to avoid all of module.h just for these trivial ops */
1293 #define ip_vs_pe_get(pe) \
1294 if (pe && pe->module) \
1295 __module_get(pe->module);
1296
1297 #define ip_vs_pe_put(pe) \
1298 if (pe && pe->module) \
1299 module_put(pe->module);
1300
1301 /* IPVS protocol functions (from ip_vs_proto.c) */
1302 int ip_vs_protocol_init(void);
1303 void ip_vs_protocol_cleanup(void);
1304 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1305 int *ip_vs_create_timeout_table(int *table, int size);
1306 int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1307 const char *name, int to);
1308 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1309 const struct sk_buff *skb, int offset,
1310 const char *msg);
1311
1312 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1313 extern struct ip_vs_protocol ip_vs_protocol_udp;
1314 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1315 extern struct ip_vs_protocol ip_vs_protocol_esp;
1316 extern struct ip_vs_protocol ip_vs_protocol_ah;
1317 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1318
1319 /* Registering/unregistering scheduler functions
1320 * (from ip_vs_sched.c)
1321 */
1322 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1323 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1324 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1325 struct ip_vs_scheduler *scheduler);
1326 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1327 struct ip_vs_scheduler *sched);
1328 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1329 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1330 struct ip_vs_conn *
1331 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1332 struct ip_vs_proto_data *pd, int *ignored,
1333 struct ip_vs_iphdr *iph);
1334 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1335 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1336
1337 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1338
1339 /* IPVS control data and functions (from ip_vs_ctl.c) */
1340 extern struct ip_vs_stats ip_vs_stats;
1341 extern int sysctl_ip_vs_sync_ver;
1342
1343 struct ip_vs_service *
1344 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1345 const union nf_inet_addr *vaddr, __be16 vport);
1346
1347 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1348 const union nf_inet_addr *daddr, __be16 dport);
1349
1350 int ip_vs_use_count_inc(void);
1351 void ip_vs_use_count_dec(void);
1352 int ip_vs_register_nl_ioctl(void);
1353 void ip_vs_unregister_nl_ioctl(void);
1354 int ip_vs_control_init(void);
1355 void ip_vs_control_cleanup(void);
1356 struct ip_vs_dest *
1357 ip_vs_find_dest(struct net *net, int svc_af, int dest_af,
1358 const union nf_inet_addr *daddr, __be16 dport,
1359 const union nf_inet_addr *vaddr, __be16 vport,
1360 __u16 protocol, __u32 fwmark, __u32 flags);
1361 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1362
1363 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1364 {
1365 atomic_inc(&dest->refcnt);
1366 }
1367
1368 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1369 {
1370 smp_mb__before_atomic();
1371 atomic_dec(&dest->refcnt);
1372 }
1373
1374 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1375 {
1376 if (atomic_dec_return(&dest->refcnt) < 0)
1377 kfree(dest);
1378 }
1379
1380 /* IPVS sync daemon data and function prototypes
1381 * (from ip_vs_sync.c)
1382 */
1383 int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
1384 int stop_sync_thread(struct net *net, int state);
1385 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1386
1387 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1388 void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1389 void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1390 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1391 void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1392 struct ip_vs_stats *stats);
1393
1394 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1395 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1396 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1397 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1398 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1399 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1400 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1401 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1402 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1403 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1404 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1405 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1406 struct ip_vs_protocol *pp, int offset,
1407 unsigned int hooknum, struct ip_vs_iphdr *iph);
1408 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1409
1410 #ifdef CONFIG_IP_VS_IPV6
1411 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1412 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1413 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1414 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1415 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1416 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1417 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1418 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1419 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1420 struct ip_vs_protocol *pp, int offset,
1421 unsigned int hooknum, struct ip_vs_iphdr *iph);
1422 #endif
1423
1424 #ifdef CONFIG_SYSCTL
1425 /* This is a simple mechanism to ignore packets when
1426 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1427 * we start to drop 1/rate of the packets
1428 */
1429 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1430 {
1431 if (!ipvs->drop_rate)
1432 return 0;
1433 if (--ipvs->drop_counter > 0)
1434 return 0;
1435 ipvs->drop_counter = ipvs->drop_rate;
1436 return 1;
1437 }
1438 #else
1439 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1440 #endif
1441
1442 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1443 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1444
1445 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1446 {
1447 char fwd;
1448
1449 switch (IP_VS_FWD_METHOD(cp)) {
1450 case IP_VS_CONN_F_MASQ:
1451 fwd = 'M'; break;
1452 case IP_VS_CONN_F_LOCALNODE:
1453 fwd = 'L'; break;
1454 case IP_VS_CONN_F_TUNNEL:
1455 fwd = 'T'; break;
1456 case IP_VS_CONN_F_DROUTE:
1457 fwd = 'R'; break;
1458 case IP_VS_CONN_F_BYPASS:
1459 fwd = 'B'; break;
1460 default:
1461 fwd = '?'; break;
1462 }
1463 return fwd;
1464 }
1465
1466 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1467 struct ip_vs_conn *cp, int dir);
1468
1469 #ifdef CONFIG_IP_VS_IPV6
1470 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1471 struct ip_vs_conn *cp, int dir);
1472 #endif
1473
1474 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1475
1476 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1477 {
1478 __be32 diff[2] = { ~old, new };
1479
1480 return csum_partial(diff, sizeof(diff), oldsum);
1481 }
1482
1483 #ifdef CONFIG_IP_VS_IPV6
1484 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1485 __wsum oldsum)
1486 {
1487 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1488 new[3], new[2], new[1], new[0] };
1489
1490 return csum_partial(diff, sizeof(diff), oldsum);
1491 }
1492 #endif
1493
1494 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1495 {
1496 __be16 diff[2] = { ~old, new };
1497
1498 return csum_partial(diff, sizeof(diff), oldsum);
1499 }
1500
1501 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1502 static inline void ip_vs_notrack(struct sk_buff *skb)
1503 {
1504 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1505 enum ip_conntrack_info ctinfo;
1506 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1507
1508 if (!ct || !nf_ct_is_untracked(ct)) {
1509 nf_conntrack_put(skb->nfct);
1510 skb->nfct = &nf_ct_untracked_get()->ct_general;
1511 skb->nfctinfo = IP_CT_NEW;
1512 nf_conntrack_get(skb->nfct);
1513 }
1514 #endif
1515 }
1516
1517 #ifdef CONFIG_IP_VS_NFCT
1518 /* Netfilter connection tracking
1519 * (from ip_vs_nfct.c)
1520 */
1521 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1522 {
1523 #ifdef CONFIG_SYSCTL
1524 return ipvs->sysctl_conntrack;
1525 #else
1526 return 0;
1527 #endif
1528 }
1529
1530 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1531 int outin);
1532 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1533 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1534 struct ip_vs_conn *cp, u_int8_t proto,
1535 const __be16 port, int from_rs);
1536 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1537
1538 #else
1539
1540 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1541 {
1542 return 0;
1543 }
1544
1545 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1546 struct ip_vs_conn *cp, int outin)
1547 {
1548 }
1549
1550 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1551 {
1552 return NF_ACCEPT;
1553 }
1554
1555 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1556 {
1557 }
1558 #endif /* CONFIG_IP_VS_NFCT */
1559
1560 static inline int
1561 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1562 {
1563 /* We think the overhead of processing active connections is 256
1564 * times higher than that of inactive connections in average. (This
1565 * 256 times might not be accurate, we will change it later) We
1566 * use the following formula to estimate the overhead now:
1567 * dest->activeconns*256 + dest->inactconns
1568 */
1569 return (atomic_read(&dest->activeconns) << 8) +
1570 atomic_read(&dest->inactconns);
1571 }
1572
1573 #endif /* _NET_IP_VS_H */
Linux with added FPC-III support