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[GitHub/mt8127/android_kernel_alcatel_ttab.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 /* old ipvsadm versions still include this file directly */
12 #ifdef __KERNEL__
13
14 #include <asm/types.h> /* for __uXX types */
15
16 #include <linux/sysctl.h> /* for ctl_path */
17 #include <linux/list.h> /* for struct list_head */
18 #include <linux/spinlock.h> /* for struct rwlock_t */
19 #include <asm/atomic.h> /* for struct atomic_t */
20 #include <linux/compiler.h>
21 #include <linux/timer.h>
22
23 #include <net/checksum.h>
24 #include <linux/netfilter.h> /* for union nf_inet_addr */
25 #include <linux/ip.h>
26 #include <linux/ipv6.h> /* for struct ipv6hdr */
27 #include <net/ipv6.h> /* for ipv6_addr_copy */
28 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
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
110 struct ip_vs_iphdr {
111 int len;
112 __u8 protocol;
113 union nf_inet_addr saddr;
114 union nf_inet_addr daddr;
115 };
116
117 static inline void
118 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
119 {
120 #ifdef CONFIG_IP_VS_IPV6
121 if (af == AF_INET6) {
122 const struct ipv6hdr *iph = nh;
123 iphdr->len = sizeof(struct ipv6hdr);
124 iphdr->protocol = iph->nexthdr;
125 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
126 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
127 } else
128 #endif
129 {
130 const struct iphdr *iph = nh;
131 iphdr->len = iph->ihl * 4;
132 iphdr->protocol = iph->protocol;
133 iphdr->saddr.ip = iph->saddr;
134 iphdr->daddr.ip = iph->daddr;
135 }
136 }
137
138 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
139 const union nf_inet_addr *src)
140 {
141 #ifdef CONFIG_IP_VS_IPV6
142 if (af == AF_INET6)
143 ipv6_addr_copy(&dst->in6, &src->in6);
144 else
145 #endif
146 dst->ip = src->ip;
147 }
148
149 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
150 const union nf_inet_addr *b)
151 {
152 #ifdef CONFIG_IP_VS_IPV6
153 if (af == AF_INET6)
154 return ipv6_addr_equal(&a->in6, &b->in6);
155 #endif
156 return a->ip == b->ip;
157 }
158
159 #ifdef CONFIG_IP_VS_DEBUG
160 #include <linux/net.h>
161
162 extern int ip_vs_get_debug_level(void);
163
164 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
165 const union nf_inet_addr *addr,
166 int *idx)
167 {
168 int len;
169 #ifdef CONFIG_IP_VS_IPV6
170 if (af == AF_INET6)
171 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
172 &addr->in6) + 1;
173 else
174 #endif
175 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
176 &addr->ip) + 1;
177
178 *idx += len;
179 BUG_ON(*idx > buf_len + 1);
180 return &buf[*idx - len];
181 }
182
183 #define IP_VS_DBG_BUF(level, msg, ...) \
184 do { \
185 char ip_vs_dbg_buf[160]; \
186 int ip_vs_dbg_idx = 0; \
187 if (level <= ip_vs_get_debug_level()) \
188 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
189 } while (0)
190 #define IP_VS_ERR_BUF(msg...) \
191 do { \
192 char ip_vs_dbg_buf[160]; \
193 int ip_vs_dbg_idx = 0; \
194 pr_err(msg); \
195 } while (0)
196
197 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
198 #define IP_VS_DBG_ADDR(af, addr) \
199 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
200 sizeof(ip_vs_dbg_buf), addr, \
201 &ip_vs_dbg_idx)
202
203 #define IP_VS_DBG(level, msg, ...) \
204 do { \
205 if (level <= ip_vs_get_debug_level()) \
206 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
207 } while (0)
208 #define IP_VS_DBG_RL(msg, ...) \
209 do { \
210 if (net_ratelimit()) \
211 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
212 } while (0)
213 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
214 do { \
215 if (level <= ip_vs_get_debug_level()) \
216 pp->debug_packet(af, pp, skb, ofs, msg); \
217 } while (0)
218 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
219 do { \
220 if (level <= ip_vs_get_debug_level() && \
221 net_ratelimit()) \
222 pp->debug_packet(af, pp, skb, ofs, msg); \
223 } while (0)
224 #else /* NO DEBUGGING at ALL */
225 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
226 #define IP_VS_ERR_BUF(msg...) do {} while (0)
227 #define IP_VS_DBG(level, msg...) do {} while (0)
228 #define IP_VS_DBG_RL(msg...) do {} while (0)
229 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
230 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
231 #endif
232
233 #define IP_VS_BUG() BUG()
234 #define IP_VS_ERR_RL(msg, ...) \
235 do { \
236 if (net_ratelimit()) \
237 pr_err(msg, ##__VA_ARGS__); \
238 } while (0)
239
240 #ifdef CONFIG_IP_VS_DEBUG
241 #define EnterFunction(level) \
242 do { \
243 if (level <= ip_vs_get_debug_level()) \
244 printk(KERN_DEBUG \
245 pr_fmt("Enter: %s, %s line %i\n"), \
246 __func__, __FILE__, __LINE__); \
247 } while (0)
248 #define LeaveFunction(level) \
249 do { \
250 if (level <= ip_vs_get_debug_level()) \
251 printk(KERN_DEBUG \
252 pr_fmt("Leave: %s, %s line %i\n"), \
253 __func__, __FILE__, __LINE__); \
254 } while (0)
255 #else
256 #define EnterFunction(level) do {} while (0)
257 #define LeaveFunction(level) do {} while (0)
258 #endif
259
260 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); }
261
262
263 /*
264 * The port number of FTP service (in network order).
265 */
266 #define FTPPORT cpu_to_be16(21)
267 #define FTPDATA cpu_to_be16(20)
268
269 /*
270 * TCP State Values
271 */
272 enum {
273 IP_VS_TCP_S_NONE = 0,
274 IP_VS_TCP_S_ESTABLISHED,
275 IP_VS_TCP_S_SYN_SENT,
276 IP_VS_TCP_S_SYN_RECV,
277 IP_VS_TCP_S_FIN_WAIT,
278 IP_VS_TCP_S_TIME_WAIT,
279 IP_VS_TCP_S_CLOSE,
280 IP_VS_TCP_S_CLOSE_WAIT,
281 IP_VS_TCP_S_LAST_ACK,
282 IP_VS_TCP_S_LISTEN,
283 IP_VS_TCP_S_SYNACK,
284 IP_VS_TCP_S_LAST
285 };
286
287 /*
288 * UDP State Values
289 */
290 enum {
291 IP_VS_UDP_S_NORMAL,
292 IP_VS_UDP_S_LAST,
293 };
294
295 /*
296 * ICMP State Values
297 */
298 enum {
299 IP_VS_ICMP_S_NORMAL,
300 IP_VS_ICMP_S_LAST,
301 };
302
303 /*
304 * SCTP State Values
305 */
306 enum ip_vs_sctp_states {
307 IP_VS_SCTP_S_NONE,
308 IP_VS_SCTP_S_INIT_CLI,
309 IP_VS_SCTP_S_INIT_SER,
310 IP_VS_SCTP_S_INIT_ACK_CLI,
311 IP_VS_SCTP_S_INIT_ACK_SER,
312 IP_VS_SCTP_S_ECHO_CLI,
313 IP_VS_SCTP_S_ECHO_SER,
314 IP_VS_SCTP_S_ESTABLISHED,
315 IP_VS_SCTP_S_SHUT_CLI,
316 IP_VS_SCTP_S_SHUT_SER,
317 IP_VS_SCTP_S_SHUT_ACK_CLI,
318 IP_VS_SCTP_S_SHUT_ACK_SER,
319 IP_VS_SCTP_S_CLOSED,
320 IP_VS_SCTP_S_LAST
321 };
322
323 /*
324 * Delta sequence info structure
325 * Each ip_vs_conn has 2 (output AND input seq. changes).
326 * Only used in the VS/NAT.
327 */
328 struct ip_vs_seq {
329 __u32 init_seq; /* Add delta from this seq */
330 __u32 delta; /* Delta in sequence numbers */
331 __u32 previous_delta; /* Delta in sequence numbers
332 before last resized pkt */
333 };
334
335 /*
336 * counters per cpu
337 */
338 struct ip_vs_counters {
339 __u32 conns; /* connections scheduled */
340 __u32 inpkts; /* incoming packets */
341 __u32 outpkts; /* outgoing packets */
342 __u64 inbytes; /* incoming bytes */
343 __u64 outbytes; /* outgoing bytes */
344 };
345 /*
346 * Stats per cpu
347 */
348 struct ip_vs_cpu_stats {
349 struct ip_vs_counters ustats;
350 struct u64_stats_sync syncp;
351 };
352
353 /*
354 * IPVS statistics objects
355 */
356 struct ip_vs_estimator {
357 struct list_head list;
358
359 u64 last_inbytes;
360 u64 last_outbytes;
361 u32 last_conns;
362 u32 last_inpkts;
363 u32 last_outpkts;
364
365 u32 cps;
366 u32 inpps;
367 u32 outpps;
368 u32 inbps;
369 u32 outbps;
370 };
371
372 struct ip_vs_stats {
373 struct ip_vs_stats_user ustats; /* statistics */
374 struct ip_vs_estimator est; /* estimator */
375 struct ip_vs_cpu_stats *cpustats; /* per cpu counters */
376 spinlock_t lock; /* spin lock */
377 struct ip_vs_stats_user ustats0; /* reset values */
378 };
379
380 struct dst_entry;
381 struct iphdr;
382 struct ip_vs_conn;
383 struct ip_vs_app;
384 struct sk_buff;
385 struct ip_vs_proto_data;
386
387 struct ip_vs_protocol {
388 struct ip_vs_protocol *next;
389 char *name;
390 u16 protocol;
391 u16 num_states;
392 int dont_defrag;
393
394 void (*init)(struct ip_vs_protocol *pp);
395
396 void (*exit)(struct ip_vs_protocol *pp);
397
398 void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
399
400 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
401
402 int (*conn_schedule)(int af, struct sk_buff *skb,
403 struct ip_vs_proto_data *pd,
404 int *verdict, struct ip_vs_conn **cpp);
405
406 struct ip_vs_conn *
407 (*conn_in_get)(int af,
408 const struct sk_buff *skb,
409 const struct ip_vs_iphdr *iph,
410 unsigned int proto_off,
411 int inverse);
412
413 struct ip_vs_conn *
414 (*conn_out_get)(int af,
415 const struct sk_buff *skb,
416 const struct ip_vs_iphdr *iph,
417 unsigned int proto_off,
418 int inverse);
419
420 int (*snat_handler)(struct sk_buff *skb,
421 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
422
423 int (*dnat_handler)(struct sk_buff *skb,
424 struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
425
426 int (*csum_check)(int af, struct sk_buff *skb,
427 struct ip_vs_protocol *pp);
428
429 const char *(*state_name)(int state);
430
431 int (*state_transition)(struct ip_vs_conn *cp, int direction,
432 const struct sk_buff *skb,
433 struct ip_vs_proto_data *pd);
434
435 int (*register_app)(struct net *net, struct ip_vs_app *inc);
436
437 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
438
439 int (*app_conn_bind)(struct ip_vs_conn *cp);
440
441 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
442 const struct sk_buff *skb,
443 int offset,
444 const char *msg);
445
446 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
447 };
448
449 /*
450 * protocol data per netns
451 */
452 struct ip_vs_proto_data {
453 struct ip_vs_proto_data *next;
454 struct ip_vs_protocol *pp;
455 int *timeout_table; /* protocol timeout table */
456 atomic_t appcnt; /* counter of proto app incs. */
457 struct tcp_states_t *tcp_state_table;
458 };
459
460 extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
461 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
462 unsigned short proto);
463
464 struct ip_vs_conn_param {
465 struct net *net;
466 const union nf_inet_addr *caddr;
467 const union nf_inet_addr *vaddr;
468 __be16 cport;
469 __be16 vport;
470 __u16 protocol;
471 u16 af;
472
473 const struct ip_vs_pe *pe;
474 char *pe_data;
475 __u8 pe_data_len;
476 };
477
478 /*
479 * IP_VS structure allocated for each dynamically scheduled connection
480 */
481 struct ip_vs_conn {
482 struct hlist_node c_list; /* hashed list heads */
483 #ifdef CONFIG_NET_NS
484 struct net *net; /* Name space */
485 #endif
486 /* Protocol, addresses and port numbers */
487 u16 af; /* address family */
488 __be16 cport;
489 __be16 vport;
490 __be16 dport;
491 __u32 fwmark; /* Fire wall mark from skb */
492 union nf_inet_addr caddr; /* client address */
493 union nf_inet_addr vaddr; /* virtual address */
494 union nf_inet_addr daddr; /* destination address */
495 volatile __u32 flags; /* status flags */
496 __u16 protocol; /* Which protocol (TCP/UDP) */
497
498 /* counter and timer */
499 atomic_t refcnt; /* reference count */
500 struct timer_list timer; /* Expiration timer */
501 volatile unsigned long timeout; /* timeout */
502
503 /* Flags and state transition */
504 spinlock_t lock; /* lock for state transition */
505 volatile __u16 state; /* state info */
506 volatile __u16 old_state; /* old state, to be used for
507 * state transition triggerd
508 * synchronization
509 */
510
511 /* Control members */
512 struct ip_vs_conn *control; /* Master control connection */
513 atomic_t n_control; /* Number of controlled ones */
514 struct ip_vs_dest *dest; /* real server */
515 atomic_t in_pkts; /* incoming packet counter */
516
517 /* packet transmitter for different forwarding methods. If it
518 mangles the packet, it must return NF_DROP or better NF_STOLEN,
519 otherwise this must be changed to a sk_buff **.
520 NF_ACCEPT can be returned when destination is local.
521 */
522 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
523 struct ip_vs_protocol *pp);
524
525 /* Note: we can group the following members into a structure,
526 in order to save more space, and the following members are
527 only used in VS/NAT anyway */
528 struct ip_vs_app *app; /* bound ip_vs_app object */
529 void *app_data; /* Application private data */
530 struct ip_vs_seq in_seq; /* incoming seq. struct */
531 struct ip_vs_seq out_seq; /* outgoing seq. struct */
532
533 const struct ip_vs_pe *pe;
534 char *pe_data;
535 __u8 pe_data_len;
536 };
537
538 /*
539 * To save some memory in conn table when name space is disabled.
540 */
541 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
542 {
543 #ifdef CONFIG_NET_NS
544 return cp->net;
545 #else
546 return &init_net;
547 #endif
548 }
549 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
550 {
551 #ifdef CONFIG_NET_NS
552 cp->net = net;
553 #endif
554 }
555
556 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
557 struct net *net)
558 {
559 #ifdef CONFIG_NET_NS
560 return cp->net == net;
561 #else
562 return 1;
563 #endif
564 }
565
566 /*
567 * Extended internal versions of struct ip_vs_service_user and
568 * ip_vs_dest_user for IPv6 support.
569 *
570 * We need these to conveniently pass around service and destination
571 * options, but unfortunately, we also need to keep the old definitions to
572 * maintain userspace backwards compatibility for the setsockopt interface.
573 */
574 struct ip_vs_service_user_kern {
575 /* virtual service addresses */
576 u16 af;
577 u16 protocol;
578 union nf_inet_addr addr; /* virtual ip address */
579 u16 port;
580 u32 fwmark; /* firwall mark of service */
581
582 /* virtual service options */
583 char *sched_name;
584 char *pe_name;
585 unsigned flags; /* virtual service flags */
586 unsigned timeout; /* persistent timeout in sec */
587 u32 netmask; /* persistent netmask */
588 };
589
590
591 struct ip_vs_dest_user_kern {
592 /* destination server address */
593 union nf_inet_addr addr;
594 u16 port;
595
596 /* real server options */
597 unsigned conn_flags; /* connection flags */
598 int weight; /* destination weight */
599
600 /* thresholds for active connections */
601 u32 u_threshold; /* upper threshold */
602 u32 l_threshold; /* lower threshold */
603 };
604
605
606 /*
607 * The information about the virtual service offered to the net
608 * and the forwarding entries
609 */
610 struct ip_vs_service {
611 struct list_head s_list; /* for normal service table */
612 struct list_head f_list; /* for fwmark-based service table */
613 atomic_t refcnt; /* reference counter */
614 atomic_t usecnt; /* use counter */
615
616 u16 af; /* address family */
617 __u16 protocol; /* which protocol (TCP/UDP) */
618 union nf_inet_addr addr; /* IP address for virtual service */
619 __be16 port; /* port number for the service */
620 __u32 fwmark; /* firewall mark of the service */
621 unsigned flags; /* service status flags */
622 unsigned timeout; /* persistent timeout in ticks */
623 __be32 netmask; /* grouping granularity */
624 struct net *net;
625
626 struct list_head destinations; /* real server d-linked list */
627 __u32 num_dests; /* number of servers */
628 struct ip_vs_stats stats; /* statistics for the service */
629 struct ip_vs_app *inc; /* bind conns to this app inc */
630
631 /* for scheduling */
632 struct ip_vs_scheduler *scheduler; /* bound scheduler object */
633 rwlock_t sched_lock; /* lock sched_data */
634 void *sched_data; /* scheduler application data */
635
636 /* alternate persistence engine */
637 struct ip_vs_pe *pe;
638 };
639
640
641 /*
642 * The real server destination forwarding entry
643 * with ip address, port number, and so on.
644 */
645 struct ip_vs_dest {
646 struct list_head n_list; /* for the dests in the service */
647 struct list_head d_list; /* for table with all the dests */
648
649 u16 af; /* address family */
650 __be16 port; /* port number of the server */
651 union nf_inet_addr addr; /* IP address of the server */
652 volatile unsigned flags; /* dest status flags */
653 atomic_t conn_flags; /* flags to copy to conn */
654 atomic_t weight; /* server weight */
655
656 atomic_t refcnt; /* reference counter */
657 struct ip_vs_stats stats; /* statistics */
658
659 /* connection counters and thresholds */
660 atomic_t activeconns; /* active connections */
661 atomic_t inactconns; /* inactive connections */
662 atomic_t persistconns; /* persistent connections */
663 __u32 u_threshold; /* upper threshold */
664 __u32 l_threshold; /* lower threshold */
665
666 /* for destination cache */
667 spinlock_t dst_lock; /* lock of dst_cache */
668 struct dst_entry *dst_cache; /* destination cache entry */
669 u32 dst_rtos; /* RT_TOS(tos) for dst */
670 u32 dst_cookie;
671 #ifdef CONFIG_IP_VS_IPV6
672 struct in6_addr dst_saddr;
673 #endif
674
675 /* for virtual service */
676 struct ip_vs_service *svc; /* service it belongs to */
677 __u16 protocol; /* which protocol (TCP/UDP) */
678 __be16 vport; /* virtual port number */
679 union nf_inet_addr vaddr; /* virtual IP address */
680 __u32 vfwmark; /* firewall mark of service */
681 };
682
683
684 /*
685 * The scheduler object
686 */
687 struct ip_vs_scheduler {
688 struct list_head n_list; /* d-linked list head */
689 char *name; /* scheduler name */
690 atomic_t refcnt; /* reference counter */
691 struct module *module; /* THIS_MODULE/NULL */
692
693 /* scheduler initializing service */
694 int (*init_service)(struct ip_vs_service *svc);
695 /* scheduling service finish */
696 int (*done_service)(struct ip_vs_service *svc);
697 /* scheduler updating service */
698 int (*update_service)(struct ip_vs_service *svc);
699
700 /* selecting a server from the given service */
701 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
702 const struct sk_buff *skb);
703 };
704
705 /* The persistence engine object */
706 struct ip_vs_pe {
707 struct list_head n_list; /* d-linked list head */
708 char *name; /* scheduler name */
709 atomic_t refcnt; /* reference counter */
710 struct module *module; /* THIS_MODULE/NULL */
711
712 /* get the connection template, if any */
713 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
714 bool (*ct_match)(const struct ip_vs_conn_param *p,
715 struct ip_vs_conn *ct);
716 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
717 bool inverse);
718 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
719 };
720
721 /*
722 * The application module object (a.k.a. app incarnation)
723 */
724 struct ip_vs_app {
725 struct list_head a_list; /* member in app list */
726 int type; /* IP_VS_APP_TYPE_xxx */
727 char *name; /* application module name */
728 __u16 protocol;
729 struct module *module; /* THIS_MODULE/NULL */
730 struct list_head incs_list; /* list of incarnations */
731
732 /* members for application incarnations */
733 struct list_head p_list; /* member in proto app list */
734 struct ip_vs_app *app; /* its real application */
735 __be16 port; /* port number in net order */
736 atomic_t usecnt; /* usage counter */
737
738 /*
739 * output hook: Process packet in inout direction, diff set for TCP.
740 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
741 * 2=Mangled but checksum was not updated
742 */
743 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
744 struct sk_buff *, int *diff);
745
746 /*
747 * input hook: Process packet in outin direction, diff set for TCP.
748 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
749 * 2=Mangled but checksum was not updated
750 */
751 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
752 struct sk_buff *, int *diff);
753
754 /* ip_vs_app initializer */
755 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
756
757 /* ip_vs_app finish */
758 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
759
760
761 /* not used now */
762 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
763 struct ip_vs_protocol *);
764
765 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
766
767 int * timeout_table;
768 int * timeouts;
769 int timeouts_size;
770
771 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
772 int *verdict, struct ip_vs_conn **cpp);
773
774 struct ip_vs_conn *
775 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
776 const struct iphdr *iph, unsigned int proto_off,
777 int inverse);
778
779 struct ip_vs_conn *
780 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
781 const struct iphdr *iph, unsigned int proto_off,
782 int inverse);
783
784 int (*state_transition)(struct ip_vs_conn *cp, int direction,
785 const struct sk_buff *skb,
786 struct ip_vs_app *app);
787
788 void (*timeout_change)(struct ip_vs_app *app, int flags);
789 };
790
791 /* IPVS in network namespace */
792 struct netns_ipvs {
793 int gen; /* Generation */
794 int enable; /* enable like nf_hooks do */
795 /*
796 * Hash table: for real service lookups
797 */
798 #define IP_VS_RTAB_BITS 4
799 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
800 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
801
802 struct list_head rs_table[IP_VS_RTAB_SIZE];
803 /* ip_vs_app */
804 struct list_head app_list;
805
806 /* ip_vs_proto */
807 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
808 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
809 /* ip_vs_proto_tcp */
810 #ifdef CONFIG_IP_VS_PROTO_TCP
811 #define TCP_APP_TAB_BITS 4
812 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
813 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
814 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
815 spinlock_t tcp_app_lock;
816 #endif
817 /* ip_vs_proto_udp */
818 #ifdef CONFIG_IP_VS_PROTO_UDP
819 #define UDP_APP_TAB_BITS 4
820 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
821 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
822 struct list_head udp_apps[UDP_APP_TAB_SIZE];
823 spinlock_t udp_app_lock;
824 #endif
825 /* ip_vs_proto_sctp */
826 #ifdef CONFIG_IP_VS_PROTO_SCTP
827 #define SCTP_APP_TAB_BITS 4
828 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
829 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
830 /* Hash table for SCTP application incarnations */
831 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
832 spinlock_t sctp_app_lock;
833 #endif
834 /* ip_vs_conn */
835 atomic_t conn_count; /* connection counter */
836
837 /* ip_vs_ctl */
838 struct ip_vs_stats tot_stats; /* Statistics & est. */
839
840 int num_services; /* no of virtual services */
841
842 rwlock_t rs_lock; /* real services table */
843 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
844 struct lock_class_key ctl_key; /* ctl_mutex debuging */
845 /* Trash for destinations */
846 struct list_head dest_trash;
847 /* Service counters */
848 atomic_t ftpsvc_counter;
849 atomic_t nullsvc_counter;
850
851 #ifdef CONFIG_SYSCTL
852 /* 1/rate drop and drop-entry variables */
853 struct delayed_work defense_work; /* Work handler */
854 int drop_rate;
855 int drop_counter;
856 atomic_t dropentry;
857 /* locks in ctl.c */
858 spinlock_t dropentry_lock; /* drop entry handling */
859 spinlock_t droppacket_lock; /* drop packet handling */
860 spinlock_t securetcp_lock; /* state and timeout tables */
861
862 /* sys-ctl struct */
863 struct ctl_table_header *sysctl_hdr;
864 struct ctl_table *sysctl_tbl;
865 #endif
866
867 /* sysctl variables */
868 int sysctl_amemthresh;
869 int sysctl_am_droprate;
870 int sysctl_drop_entry;
871 int sysctl_drop_packet;
872 int sysctl_secure_tcp;
873 #ifdef CONFIG_IP_VS_NFCT
874 int sysctl_conntrack;
875 #endif
876 int sysctl_snat_reroute;
877 int sysctl_sync_ver;
878 int sysctl_cache_bypass;
879 int sysctl_expire_nodest_conn;
880 int sysctl_expire_quiescent_template;
881 int sysctl_sync_threshold[2];
882 int sysctl_nat_icmp_send;
883
884 /* ip_vs_lblc */
885 int sysctl_lblc_expiration;
886 struct ctl_table_header *lblc_ctl_header;
887 struct ctl_table *lblc_ctl_table;
888 /* ip_vs_lblcr */
889 int sysctl_lblcr_expiration;
890 struct ctl_table_header *lblcr_ctl_header;
891 struct ctl_table *lblcr_ctl_table;
892 /* ip_vs_est */
893 struct list_head est_list; /* estimator list */
894 spinlock_t est_lock;
895 struct timer_list est_timer; /* Estimation timer */
896 /* ip_vs_sync */
897 struct list_head sync_queue;
898 spinlock_t sync_lock;
899 struct ip_vs_sync_buff *sync_buff;
900 spinlock_t sync_buff_lock;
901 struct sockaddr_in sync_mcast_addr;
902 struct task_struct *master_thread;
903 struct task_struct *backup_thread;
904 int send_mesg_maxlen;
905 int recv_mesg_maxlen;
906 volatile int sync_state;
907 volatile int master_syncid;
908 volatile int backup_syncid;
909 /* multicast interface name */
910 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
911 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
912 /* net name space ptr */
913 struct net *net; /* Needed by timer routines */
914 };
915
916 #define DEFAULT_SYNC_THRESHOLD 3
917 #define DEFAULT_SYNC_PERIOD 50
918 #define DEFAULT_SYNC_VER 1
919
920 #ifdef CONFIG_SYSCTL
921
922 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
923 {
924 return ipvs->sysctl_sync_threshold[0];
925 }
926
927 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
928 {
929 return ipvs->sysctl_sync_threshold[1];
930 }
931
932 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
933 {
934 return ipvs->sysctl_sync_ver;
935 }
936
937 #else
938
939 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
940 {
941 return DEFAULT_SYNC_THRESHOLD;
942 }
943
944 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
945 {
946 return DEFAULT_SYNC_PERIOD;
947 }
948
949 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
950 {
951 return DEFAULT_SYNC_VER;
952 }
953
954 #endif
955
956 /*
957 * IPVS core functions
958 * (from ip_vs_core.c)
959 */
960 extern const char *ip_vs_proto_name(unsigned proto);
961 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
962 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
963
964 #define IP_VS_APP_TYPE_FTP 1
965
966 /*
967 * ip_vs_conn handling functions
968 * (from ip_vs_conn.c)
969 */
970
971 enum {
972 IP_VS_DIR_INPUT = 0,
973 IP_VS_DIR_OUTPUT,
974 IP_VS_DIR_INPUT_ONLY,
975 IP_VS_DIR_LAST,
976 };
977
978 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
979 const union nf_inet_addr *caddr,
980 __be16 cport,
981 const union nf_inet_addr *vaddr,
982 __be16 vport,
983 struct ip_vs_conn_param *p)
984 {
985 p->net = net;
986 p->af = af;
987 p->protocol = protocol;
988 p->caddr = caddr;
989 p->cport = cport;
990 p->vaddr = vaddr;
991 p->vport = vport;
992 p->pe = NULL;
993 p->pe_data = NULL;
994 }
995
996 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
997 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
998
999 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1000 const struct ip_vs_iphdr *iph,
1001 unsigned int proto_off,
1002 int inverse);
1003
1004 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1005
1006 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1007 const struct ip_vs_iphdr *iph,
1008 unsigned int proto_off,
1009 int inverse);
1010
1011 /* put back the conn without restarting its timer */
1012 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1013 {
1014 atomic_dec(&cp->refcnt);
1015 }
1016 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1017 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1018
1019 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1020 const union nf_inet_addr *daddr,
1021 __be16 dport, unsigned flags,
1022 struct ip_vs_dest *dest, __u32 fwmark);
1023 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1024
1025 extern const char * ip_vs_state_name(__u16 proto, int state);
1026
1027 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1028 extern int ip_vs_check_template(struct ip_vs_conn *ct);
1029 extern void ip_vs_random_dropentry(struct net *net);
1030 extern int ip_vs_conn_init(void);
1031 extern void ip_vs_conn_cleanup(void);
1032
1033 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1034 {
1035 struct ip_vs_conn *ctl_cp = cp->control;
1036 if (!ctl_cp) {
1037 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1038 "%s:%d to %s:%d\n",
1039 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1040 ntohs(cp->cport),
1041 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1042 ntohs(cp->vport));
1043
1044 return;
1045 }
1046
1047 IP_VS_DBG_BUF(7, "DELeting control for: "
1048 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1049 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1050 ntohs(cp->cport),
1051 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1052 ntohs(ctl_cp->cport));
1053
1054 cp->control = NULL;
1055 if (atomic_read(&ctl_cp->n_control) == 0) {
1056 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1057 "%s:%d to %s:%d\n",
1058 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1059 ntohs(cp->cport),
1060 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1061 ntohs(cp->vport));
1062
1063 return;
1064 }
1065 atomic_dec(&ctl_cp->n_control);
1066 }
1067
1068 static inline void
1069 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1070 {
1071 if (cp->control) {
1072 IP_VS_ERR_BUF("request control ADD for already controlled: "
1073 "%s:%d to %s:%d\n",
1074 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1075 ntohs(cp->cport),
1076 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1077 ntohs(cp->vport));
1078
1079 ip_vs_control_del(cp);
1080 }
1081
1082 IP_VS_DBG_BUF(7, "ADDing control for: "
1083 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1084 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1085 ntohs(cp->cport),
1086 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1087 ntohs(ctl_cp->cport));
1088
1089 cp->control = ctl_cp;
1090 atomic_inc(&ctl_cp->n_control);
1091 }
1092
1093 /*
1094 * IPVS netns init & cleanup functions
1095 */
1096 extern int __ip_vs_estimator_init(struct net *net);
1097 extern int __ip_vs_control_init(struct net *net);
1098 extern int __ip_vs_protocol_init(struct net *net);
1099 extern int __ip_vs_app_init(struct net *net);
1100 extern int __ip_vs_conn_init(struct net *net);
1101 extern int __ip_vs_sync_init(struct net *net);
1102 extern void __ip_vs_conn_cleanup(struct net *net);
1103 extern void __ip_vs_app_cleanup(struct net *net);
1104 extern void __ip_vs_protocol_cleanup(struct net *net);
1105 extern void __ip_vs_control_cleanup(struct net *net);
1106 extern void __ip_vs_estimator_cleanup(struct net *net);
1107 extern void __ip_vs_sync_cleanup(struct net *net);
1108 extern void __ip_vs_service_cleanup(struct net *net);
1109
1110 /*
1111 * IPVS application functions
1112 * (from ip_vs_app.c)
1113 */
1114 #define IP_VS_APP_MAX_PORTS 8
1115 extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1116 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1117 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1118 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1119 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1120 __u16 proto, __u16 port);
1121 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1122 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1123
1124 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1125 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1126 extern int ip_vs_app_init(void);
1127 extern void ip_vs_app_cleanup(void);
1128
1129 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1130 void ip_vs_unbind_pe(struct ip_vs_service *svc);
1131 int register_ip_vs_pe(struct ip_vs_pe *pe);
1132 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1133 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1134 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1135
1136 static inline void ip_vs_pe_get(const struct ip_vs_pe *pe)
1137 {
1138 if (pe && pe->module)
1139 __module_get(pe->module);
1140 }
1141
1142 static inline void ip_vs_pe_put(const struct ip_vs_pe *pe)
1143 {
1144 if (pe && pe->module)
1145 module_put(pe->module);
1146 }
1147
1148 /*
1149 * IPVS protocol functions (from ip_vs_proto.c)
1150 */
1151 extern int ip_vs_protocol_init(void);
1152 extern void ip_vs_protocol_cleanup(void);
1153 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1154 extern int *ip_vs_create_timeout_table(int *table, int size);
1155 extern int
1156 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1157 const char *name, int to);
1158 extern void
1159 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1160 const struct sk_buff *skb,
1161 int offset, const char *msg);
1162
1163 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1164 extern struct ip_vs_protocol ip_vs_protocol_udp;
1165 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1166 extern struct ip_vs_protocol ip_vs_protocol_esp;
1167 extern struct ip_vs_protocol ip_vs_protocol_ah;
1168 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1169
1170 /*
1171 * Registering/unregistering scheduler functions
1172 * (from ip_vs_sched.c)
1173 */
1174 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1175 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1176 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1177 struct ip_vs_scheduler *scheduler);
1178 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1179 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1180 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1181 extern struct ip_vs_conn *
1182 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1183 struct ip_vs_proto_data *pd, int *ignored);
1184 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1185 struct ip_vs_proto_data *pd);
1186
1187 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1188
1189
1190 /*
1191 * IPVS control data and functions (from ip_vs_ctl.c)
1192 */
1193 extern struct ip_vs_stats ip_vs_stats;
1194 extern const struct ctl_path net_vs_ctl_path[];
1195 extern int sysctl_ip_vs_sync_ver;
1196
1197 extern void ip_vs_sync_switch_mode(struct net *net, int mode);
1198 extern struct ip_vs_service *
1199 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1200 const union nf_inet_addr *vaddr, __be16 vport);
1201
1202 static inline void ip_vs_service_put(struct ip_vs_service *svc)
1203 {
1204 atomic_dec(&svc->usecnt);
1205 }
1206
1207 extern struct ip_vs_dest *
1208 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1209 const union nf_inet_addr *daddr, __be16 dport);
1210
1211 extern int ip_vs_use_count_inc(void);
1212 extern void ip_vs_use_count_dec(void);
1213 extern int ip_vs_control_init(void);
1214 extern void ip_vs_control_cleanup(void);
1215 extern struct ip_vs_dest *
1216 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1217 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1218 __u16 protocol, __u32 fwmark);
1219 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1220
1221
1222 /*
1223 * IPVS sync daemon data and function prototypes
1224 * (from ip_vs_sync.c)
1225 */
1226 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1227 __u8 syncid);
1228 extern int stop_sync_thread(struct net *net, int state);
1229 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp);
1230 extern int ip_vs_sync_init(void);
1231 extern void ip_vs_sync_cleanup(void);
1232
1233
1234 /*
1235 * IPVS rate estimator prototypes (from ip_vs_est.c)
1236 */
1237 extern int ip_vs_estimator_init(void);
1238 extern void ip_vs_estimator_cleanup(void);
1239 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1240 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1241 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1242 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1243 struct ip_vs_stats *stats);
1244
1245 /*
1246 * Various IPVS packet transmitters (from ip_vs_xmit.c)
1247 */
1248 extern int ip_vs_null_xmit
1249 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1250 extern int ip_vs_bypass_xmit
1251 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1252 extern int ip_vs_nat_xmit
1253 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1254 extern int ip_vs_tunnel_xmit
1255 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1256 extern int ip_vs_dr_xmit
1257 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1258 extern int ip_vs_icmp_xmit
1259 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
1260 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1261
1262 #ifdef CONFIG_IP_VS_IPV6
1263 extern int ip_vs_bypass_xmit_v6
1264 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1265 extern int ip_vs_nat_xmit_v6
1266 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1267 extern int ip_vs_tunnel_xmit_v6
1268 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1269 extern int ip_vs_dr_xmit_v6
1270 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1271 extern int ip_vs_icmp_xmit_v6
1272 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1273 int offset);
1274 #endif
1275
1276 #ifdef CONFIG_SYSCTL
1277 /*
1278 * This is a simple mechanism to ignore packets when
1279 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1280 * we start to drop 1/rate of the packets
1281 */
1282
1283 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1284 {
1285 if (!ipvs->drop_rate)
1286 return 0;
1287 if (--ipvs->drop_counter > 0)
1288 return 0;
1289 ipvs->drop_counter = ipvs->drop_rate;
1290 return 1;
1291 }
1292 #else
1293 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1294 #endif
1295
1296 /*
1297 * ip_vs_fwd_tag returns the forwarding tag of the connection
1298 */
1299 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1300
1301 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1302 {
1303 char fwd;
1304
1305 switch (IP_VS_FWD_METHOD(cp)) {
1306 case IP_VS_CONN_F_MASQ:
1307 fwd = 'M'; break;
1308 case IP_VS_CONN_F_LOCALNODE:
1309 fwd = 'L'; break;
1310 case IP_VS_CONN_F_TUNNEL:
1311 fwd = 'T'; break;
1312 case IP_VS_CONN_F_DROUTE:
1313 fwd = 'R'; break;
1314 case IP_VS_CONN_F_BYPASS:
1315 fwd = 'B'; break;
1316 default:
1317 fwd = '?'; break;
1318 }
1319 return fwd;
1320 }
1321
1322 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1323 struct ip_vs_conn *cp, int dir);
1324
1325 #ifdef CONFIG_IP_VS_IPV6
1326 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1327 struct ip_vs_conn *cp, int dir);
1328 #endif
1329
1330 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1331
1332 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1333 {
1334 __be32 diff[2] = { ~old, new };
1335
1336 return csum_partial(diff, sizeof(diff), oldsum);
1337 }
1338
1339 #ifdef CONFIG_IP_VS_IPV6
1340 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1341 __wsum oldsum)
1342 {
1343 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1344 new[3], new[2], new[1], new[0] };
1345
1346 return csum_partial(diff, sizeof(diff), oldsum);
1347 }
1348 #endif
1349
1350 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1351 {
1352 __be16 diff[2] = { ~old, new };
1353
1354 return csum_partial(diff, sizeof(diff), oldsum);
1355 }
1356
1357 /*
1358 * Forget current conntrack (unconfirmed) and attach notrack entry
1359 */
1360 static inline void ip_vs_notrack(struct sk_buff *skb)
1361 {
1362 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1363 enum ip_conntrack_info ctinfo;
1364 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1365
1366 if (!ct || !nf_ct_is_untracked(ct)) {
1367 nf_reset(skb);
1368 skb->nfct = &nf_ct_untracked_get()->ct_general;
1369 skb->nfctinfo = IP_CT_NEW;
1370 nf_conntrack_get(skb->nfct);
1371 }
1372 #endif
1373 }
1374
1375 #ifdef CONFIG_IP_VS_NFCT
1376 /*
1377 * Netfilter connection tracking
1378 * (from ip_vs_nfct.c)
1379 */
1380 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1381 {
1382 #ifdef CONFIG_SYSCTL
1383 return ipvs->sysctl_conntrack;
1384 #else
1385 return 0;
1386 #endif
1387 }
1388
1389 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1390 int outin);
1391 extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1392 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1393 struct ip_vs_conn *cp, u_int8_t proto,
1394 const __be16 port, int from_rs);
1395 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1396
1397 #else
1398
1399 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1400 {
1401 return 0;
1402 }
1403
1404 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1405 struct ip_vs_conn *cp, int outin)
1406 {
1407 }
1408
1409 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1410 struct ip_vs_conn *cp)
1411 {
1412 return NF_ACCEPT;
1413 }
1414
1415 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1416 {
1417 }
1418 /* CONFIG_IP_VS_NFCT */
1419 #endif
1420
1421 static inline unsigned int
1422 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1423 {
1424 /*
1425 * We think the overhead of processing active connections is 256
1426 * times higher than that of inactive connections in average. (This
1427 * 256 times might not be accurate, we will change it later) We
1428 * use the following formula to estimate the overhead now:
1429 * dest->activeconns*256 + dest->inactconns
1430 */
1431 return (atomic_read(&dest->activeconns) << 8) +
1432 atomic_read(&dest->inactconns);
1433 }
1434
1435 #endif /* __KERNEL__ */
1436
1437 #endif /* _NET_IP_VS_H */
kernel source for telekom puls (alcatel/mediatek)