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ipvs: add sync_maxlen parameter for the sync daemon
[deliverable/linux.git] / include / net / ip_vs.h
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 && dev_net(skb->dev)))
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 && sock_net(skb->sk)))
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 && sock_net(skb->sk)))
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 && dev_net(skb->dev)))
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 __u64 conns; /* connections scheduled */
369 __u64 inpkts; /* incoming packets */
370 __u64 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 cnt;
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 u64 last_conns;
387 u64 last_inpkts;
388 u64 last_outpkts;
389
390 u64 cps;
391 u64 inpps;
392 u64 outpps;
393 u64 inbps;
394 u64 outbps;
395 };
396
397 /*
398 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
399 */
400 struct ip_vs_kstats {
401 u64 conns; /* connections scheduled */
402 u64 inpkts; /* incoming packets */
403 u64 outpkts; /* outgoing packets */
404 u64 inbytes; /* incoming bytes */
405 u64 outbytes; /* outgoing bytes */
406
407 u64 cps; /* current connection rate */
408 u64 inpps; /* current in packet rate */
409 u64 outpps; /* current out packet rate */
410 u64 inbps; /* current in byte rate */
411 u64 outbps; /* current out byte rate */
412 };
413
414 struct ip_vs_stats {
415 struct ip_vs_kstats kstats; /* kernel statistics */
416 struct ip_vs_estimator est; /* estimator */
417 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
418 spinlock_t lock; /* spin lock */
419 struct ip_vs_kstats kstats0; /* reset values */
420 };
421
422 struct dst_entry;
423 struct iphdr;
424 struct ip_vs_conn;
425 struct ip_vs_app;
426 struct sk_buff;
427 struct ip_vs_proto_data;
428
429 struct ip_vs_protocol {
430 struct ip_vs_protocol *next;
431 char *name;
432 u16 protocol;
433 u16 num_states;
434 int dont_defrag;
435
436 void (*init)(struct ip_vs_protocol *pp);
437
438 void (*exit)(struct ip_vs_protocol *pp);
439
440 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
441
442 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
443
444 int (*conn_schedule)(int af, struct sk_buff *skb,
445 struct ip_vs_proto_data *pd,
446 int *verdict, struct ip_vs_conn **cpp,
447 struct ip_vs_iphdr *iph);
448
449 struct ip_vs_conn *
450 (*conn_in_get)(int af,
451 const struct sk_buff *skb,
452 const struct ip_vs_iphdr *iph,
453 int inverse);
454
455 struct ip_vs_conn *
456 (*conn_out_get)(int af,
457 const struct sk_buff *skb,
458 const struct ip_vs_iphdr *iph,
459 int inverse);
460
461 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
462 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
463
464 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
465 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
466
467 int (*csum_check)(int af, struct sk_buff *skb,
468 struct ip_vs_protocol *pp);
469
470 const char *(*state_name)(int state);
471
472 void (*state_transition)(struct ip_vs_conn *cp, int direction,
473 const struct sk_buff *skb,
474 struct ip_vs_proto_data *pd);
475
476 int (*register_app)(struct net *net, struct ip_vs_app *inc);
477
478 void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
479
480 int (*app_conn_bind)(struct ip_vs_conn *cp);
481
482 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
483 const struct sk_buff *skb,
484 int offset,
485 const char *msg);
486
487 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
488 };
489
490 /* protocol data per netns */
491 struct ip_vs_proto_data {
492 struct ip_vs_proto_data *next;
493 struct ip_vs_protocol *pp;
494 int *timeout_table; /* protocol timeout table */
495 atomic_t appcnt; /* counter of proto app incs. */
496 struct tcp_states_t *tcp_state_table;
497 };
498
499 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
500 struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
501 unsigned short proto);
502
503 struct ip_vs_conn_param {
504 struct net *net;
505 const union nf_inet_addr *caddr;
506 const union nf_inet_addr *vaddr;
507 __be16 cport;
508 __be16 vport;
509 __u16 protocol;
510 u16 af;
511
512 const struct ip_vs_pe *pe;
513 char *pe_data;
514 __u8 pe_data_len;
515 };
516
517 /* IP_VS structure allocated for each dynamically scheduled connection */
518 struct ip_vs_conn {
519 struct hlist_node c_list; /* hashed list heads */
520 /* Protocol, addresses and port numbers */
521 __be16 cport;
522 __be16 dport;
523 __be16 vport;
524 u16 af; /* address family */
525 union nf_inet_addr caddr; /* client address */
526 union nf_inet_addr vaddr; /* virtual address */
527 union nf_inet_addr daddr; /* destination address */
528 volatile __u32 flags; /* status flags */
529 __u16 protocol; /* Which protocol (TCP/UDP) */
530 __u16 daf; /* Address family of the dest */
531 #ifdef CONFIG_NET_NS
532 struct net *net; /* Name space */
533 #endif
534
535 /* counter and timer */
536 atomic_t refcnt; /* reference count */
537 struct timer_list timer; /* Expiration timer */
538 volatile unsigned long timeout; /* timeout */
539
540 /* Flags and state transition */
541 spinlock_t lock; /* lock for state transition */
542 volatile __u16 state; /* state info */
543 volatile __u16 old_state; /* old state, to be used for
544 * state transition triggerd
545 * synchronization
546 */
547 __u32 fwmark; /* Fire wall mark from skb */
548 unsigned long sync_endtime; /* jiffies + sent_retries */
549
550 /* Control members */
551 struct ip_vs_conn *control; /* Master control connection */
552 atomic_t n_control; /* Number of controlled ones */
553 struct ip_vs_dest *dest; /* real server */
554 atomic_t in_pkts; /* incoming packet counter */
555
556 /* Packet transmitter for different forwarding methods. If it
557 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
558 * otherwise this must be changed to a sk_buff **.
559 * NF_ACCEPT can be returned when destination is local.
560 */
561 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
562 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
563
564 /* Note: we can group the following members into a structure,
565 * in order to save more space, and the following members are
566 * only used in VS/NAT anyway
567 */
568 struct ip_vs_app *app; /* bound ip_vs_app object */
569 void *app_data; /* Application private data */
570 struct ip_vs_seq in_seq; /* incoming seq. struct */
571 struct ip_vs_seq out_seq; /* outgoing seq. struct */
572
573 const struct ip_vs_pe *pe;
574 char *pe_data;
575 __u8 pe_data_len;
576
577 struct rcu_head rcu_head;
578 };
579
580 /* To save some memory in conn table when name space is disabled. */
581 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
582 {
583 #ifdef CONFIG_NET_NS
584 return cp->net;
585 #else
586 return &init_net;
587 #endif
588 }
589
590 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
591 {
592 #ifdef CONFIG_NET_NS
593 cp->net = net;
594 #endif
595 }
596
597 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
598 struct net *net)
599 {
600 #ifdef CONFIG_NET_NS
601 return cp->net == net;
602 #else
603 return 1;
604 #endif
605 }
606
607 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
608 * for IPv6 support.
609 *
610 * We need these to conveniently pass around service and destination
611 * options, but unfortunately, we also need to keep the old definitions to
612 * maintain userspace backwards compatibility for the setsockopt interface.
613 */
614 struct ip_vs_service_user_kern {
615 /* virtual service addresses */
616 u16 af;
617 u16 protocol;
618 union nf_inet_addr addr; /* virtual ip address */
619 __be16 port;
620 u32 fwmark; /* firwall mark of service */
621
622 /* virtual service options */
623 char *sched_name;
624 char *pe_name;
625 unsigned int flags; /* virtual service flags */
626 unsigned int timeout; /* persistent timeout in sec */
627 __be32 netmask; /* persistent netmask or plen */
628 };
629
630
631 struct ip_vs_dest_user_kern {
632 /* destination server address */
633 union nf_inet_addr addr;
634 __be16 port;
635
636 /* real server options */
637 unsigned int conn_flags; /* connection flags */
638 int weight; /* destination weight */
639
640 /* thresholds for active connections */
641 u32 u_threshold; /* upper threshold */
642 u32 l_threshold; /* lower threshold */
643
644 /* Address family of addr */
645 u16 af;
646 };
647
648
649 /*
650 * The information about the virtual service offered to the net and the
651 * forwarding entries.
652 */
653 struct ip_vs_service {
654 struct hlist_node s_list; /* for normal service table */
655 struct hlist_node f_list; /* for fwmark-based service table */
656 atomic_t refcnt; /* reference counter */
657
658 u16 af; /* address family */
659 __u16 protocol; /* which protocol (TCP/UDP) */
660 union nf_inet_addr addr; /* IP address for virtual service */
661 __be16 port; /* port number for the service */
662 __u32 fwmark; /* firewall mark of the service */
663 unsigned int flags; /* service status flags */
664 unsigned int timeout; /* persistent timeout in ticks */
665 __be32 netmask; /* grouping granularity, mask/plen */
666 struct net *net;
667
668 struct list_head destinations; /* real server d-linked list */
669 __u32 num_dests; /* number of servers */
670 struct ip_vs_stats stats; /* statistics for the service */
671
672 /* for scheduling */
673 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
674 spinlock_t sched_lock; /* lock sched_data */
675 void *sched_data; /* scheduler application data */
676
677 /* alternate persistence engine */
678 struct ip_vs_pe __rcu *pe;
679
680 struct rcu_head rcu_head;
681 };
682
683 /* Information for cached dst */
684 struct ip_vs_dest_dst {
685 struct dst_entry *dst_cache; /* destination cache entry */
686 u32 dst_cookie;
687 union nf_inet_addr dst_saddr;
688 struct rcu_head rcu_head;
689 };
690
691 /* The real server destination forwarding entry with ip address, port number,
692 * and so on.
693 */
694 struct ip_vs_dest {
695 struct list_head n_list; /* for the dests in the service */
696 struct hlist_node d_list; /* for table with all the dests */
697
698 u16 af; /* address family */
699 __be16 port; /* port number of the server */
700 union nf_inet_addr addr; /* IP address of the server */
701 volatile unsigned int flags; /* dest status flags */
702 atomic_t conn_flags; /* flags to copy to conn */
703 atomic_t weight; /* server weight */
704
705 atomic_t refcnt; /* reference counter */
706 struct ip_vs_stats stats; /* statistics */
707 unsigned long idle_start; /* start time, jiffies */
708
709 /* connection counters and thresholds */
710 atomic_t activeconns; /* active connections */
711 atomic_t inactconns; /* inactive connections */
712 atomic_t persistconns; /* persistent connections */
713 __u32 u_threshold; /* upper threshold */
714 __u32 l_threshold; /* lower threshold */
715
716 /* for destination cache */
717 spinlock_t dst_lock; /* lock of dst_cache */
718 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
719
720 /* for virtual service */
721 struct ip_vs_service __rcu *svc; /* service it belongs to */
722 __u16 protocol; /* which protocol (TCP/UDP) */
723 __be16 vport; /* virtual port number */
724 union nf_inet_addr vaddr; /* virtual IP address */
725 __u32 vfwmark; /* firewall mark of service */
726
727 struct list_head t_list; /* in dest_trash */
728 unsigned int in_rs_table:1; /* we are in rs_table */
729 };
730
731 /* The scheduler object */
732 struct ip_vs_scheduler {
733 struct list_head n_list; /* d-linked list head */
734 char *name; /* scheduler name */
735 atomic_t refcnt; /* reference counter */
736 struct module *module; /* THIS_MODULE/NULL */
737
738 /* scheduler initializing service */
739 int (*init_service)(struct ip_vs_service *svc);
740 /* scheduling service finish */
741 void (*done_service)(struct ip_vs_service *svc);
742 /* dest is linked */
743 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
744 /* dest is unlinked */
745 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
746 /* dest is updated */
747 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
748
749 /* selecting a server from the given service */
750 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
751 const struct sk_buff *skb,
752 struct ip_vs_iphdr *iph);
753 };
754
755 /* The persistence engine object */
756 struct ip_vs_pe {
757 struct list_head n_list; /* d-linked list head */
758 char *name; /* scheduler name */
759 atomic_t refcnt; /* reference counter */
760 struct module *module; /* THIS_MODULE/NULL */
761
762 /* get the connection template, if any */
763 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
764 bool (*ct_match)(const struct ip_vs_conn_param *p,
765 struct ip_vs_conn *ct);
766 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
767 bool inverse);
768 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
769 };
770
771 /* The application module object (a.k.a. app incarnation) */
772 struct ip_vs_app {
773 struct list_head a_list; /* member in app list */
774 int type; /* IP_VS_APP_TYPE_xxx */
775 char *name; /* application module name */
776 __u16 protocol;
777 struct module *module; /* THIS_MODULE/NULL */
778 struct list_head incs_list; /* list of incarnations */
779
780 /* members for application incarnations */
781 struct list_head p_list; /* member in proto app list */
782 struct ip_vs_app *app; /* its real application */
783 __be16 port; /* port number in net order */
784 atomic_t usecnt; /* usage counter */
785 struct rcu_head rcu_head;
786
787 /* output hook: Process packet in inout direction, diff set for TCP.
788 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
789 * 2=Mangled but checksum was not updated
790 */
791 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
792 struct sk_buff *, int *diff);
793
794 /* input hook: Process packet in outin direction, diff set for TCP.
795 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
796 * 2=Mangled but checksum was not updated
797 */
798 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
799 struct sk_buff *, int *diff);
800
801 /* ip_vs_app initializer */
802 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
803
804 /* ip_vs_app finish */
805 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
806
807
808 /* not used now */
809 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
810 struct ip_vs_protocol *);
811
812 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
813
814 int * timeout_table;
815 int * timeouts;
816 int timeouts_size;
817
818 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
819 int *verdict, struct ip_vs_conn **cpp);
820
821 struct ip_vs_conn *
822 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
823 const struct iphdr *iph, int inverse);
824
825 struct ip_vs_conn *
826 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
827 const struct iphdr *iph, int inverse);
828
829 int (*state_transition)(struct ip_vs_conn *cp, int direction,
830 const struct sk_buff *skb,
831 struct ip_vs_app *app);
832
833 void (*timeout_change)(struct ip_vs_app *app, int flags);
834 };
835
836 struct ipvs_master_sync_state {
837 struct list_head sync_queue;
838 struct ip_vs_sync_buff *sync_buff;
839 unsigned long sync_queue_len;
840 unsigned int sync_queue_delay;
841 struct task_struct *master_thread;
842 struct delayed_work master_wakeup_work;
843 struct netns_ipvs *ipvs;
844 };
845
846 /* How much time to keep dests in trash */
847 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
848
849 struct ipvs_sync_daemon_cfg {
850 int syncid;
851 u16 sync_maxlen;
852 /* multicast interface name */
853 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
854 };
855
856 /* IPVS in network namespace */
857 struct netns_ipvs {
858 int gen; /* Generation */
859 int enable; /* enable like nf_hooks do */
860 /* Hash table: for real service lookups */
861 #define IP_VS_RTAB_BITS 4
862 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
863 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
864
865 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
866 /* ip_vs_app */
867 struct list_head app_list;
868 /* ip_vs_proto */
869 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
870 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
871 /* ip_vs_proto_tcp */
872 #ifdef CONFIG_IP_VS_PROTO_TCP
873 #define TCP_APP_TAB_BITS 4
874 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
875 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
876 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
877 #endif
878 /* ip_vs_proto_udp */
879 #ifdef CONFIG_IP_VS_PROTO_UDP
880 #define UDP_APP_TAB_BITS 4
881 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
882 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
883 struct list_head udp_apps[UDP_APP_TAB_SIZE];
884 #endif
885 /* ip_vs_proto_sctp */
886 #ifdef CONFIG_IP_VS_PROTO_SCTP
887 #define SCTP_APP_TAB_BITS 4
888 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
889 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
890 /* Hash table for SCTP application incarnations */
891 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
892 #endif
893 /* ip_vs_conn */
894 atomic_t conn_count; /* connection counter */
895
896 /* ip_vs_ctl */
897 struct ip_vs_stats tot_stats; /* Statistics & est. */
898
899 int num_services; /* no of virtual services */
900
901 /* Trash for destinations */
902 struct list_head dest_trash;
903 spinlock_t dest_trash_lock;
904 struct timer_list dest_trash_timer; /* expiration timer */
905 /* Service counters */
906 atomic_t ftpsvc_counter;
907 atomic_t nullsvc_counter;
908
909 #ifdef CONFIG_SYSCTL
910 /* 1/rate drop and drop-entry variables */
911 struct delayed_work defense_work; /* Work handler */
912 int drop_rate;
913 int drop_counter;
914 atomic_t dropentry;
915 /* locks in ctl.c */
916 spinlock_t dropentry_lock; /* drop entry handling */
917 spinlock_t droppacket_lock; /* drop packet handling */
918 spinlock_t securetcp_lock; /* state and timeout tables */
919
920 /* sys-ctl struct */
921 struct ctl_table_header *sysctl_hdr;
922 struct ctl_table *sysctl_tbl;
923 #endif
924
925 /* sysctl variables */
926 int sysctl_amemthresh;
927 int sysctl_am_droprate;
928 int sysctl_drop_entry;
929 int sysctl_drop_packet;
930 int sysctl_secure_tcp;
931 #ifdef CONFIG_IP_VS_NFCT
932 int sysctl_conntrack;
933 #endif
934 int sysctl_snat_reroute;
935 int sysctl_sync_ver;
936 int sysctl_sync_ports;
937 int sysctl_sync_persist_mode;
938 unsigned long sysctl_sync_qlen_max;
939 int sysctl_sync_sock_size;
940 int sysctl_cache_bypass;
941 int sysctl_expire_nodest_conn;
942 int sysctl_sloppy_tcp;
943 int sysctl_sloppy_sctp;
944 int sysctl_expire_quiescent_template;
945 int sysctl_sync_threshold[2];
946 unsigned int sysctl_sync_refresh_period;
947 int sysctl_sync_retries;
948 int sysctl_nat_icmp_send;
949 int sysctl_pmtu_disc;
950 int sysctl_backup_only;
951 int sysctl_conn_reuse_mode;
952
953 /* ip_vs_lblc */
954 int sysctl_lblc_expiration;
955 struct ctl_table_header *lblc_ctl_header;
956 struct ctl_table *lblc_ctl_table;
957 /* ip_vs_lblcr */
958 int sysctl_lblcr_expiration;
959 struct ctl_table_header *lblcr_ctl_header;
960 struct ctl_table *lblcr_ctl_table;
961 /* ip_vs_est */
962 struct list_head est_list; /* estimator list */
963 spinlock_t est_lock;
964 struct timer_list est_timer; /* Estimation timer */
965 /* ip_vs_sync */
966 spinlock_t sync_lock;
967 struct ipvs_master_sync_state *ms;
968 spinlock_t sync_buff_lock;
969 struct task_struct **backup_threads;
970 int threads_mask;
971 volatile int sync_state;
972 struct mutex sync_mutex;
973 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
974 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
975 /* net name space ptr */
976 struct net *net; /* Needed by timer routines */
977 /* Number of heterogeneous destinations, needed becaus heterogeneous
978 * are not supported when synchronization is enabled.
979 */
980 unsigned int mixed_address_family_dests;
981 };
982
983 #define DEFAULT_SYNC_THRESHOLD 3
984 #define DEFAULT_SYNC_PERIOD 50
985 #define DEFAULT_SYNC_VER 1
986 #define DEFAULT_SLOPPY_TCP 0
987 #define DEFAULT_SLOPPY_SCTP 0
988 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
989 #define DEFAULT_SYNC_RETRIES 0
990 #define IPVS_SYNC_WAKEUP_RATE 8
991 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
992 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
993 #define IPVS_SYNC_CHECK_PERIOD HZ
994 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
995 #define IPVS_SYNC_PORTS_MAX (1 << 6)
996
997 #ifdef CONFIG_SYSCTL
998
999 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1000 {
1001 return ipvs->sysctl_sync_threshold[0];
1002 }
1003
1004 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1005 {
1006 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1007 }
1008
1009 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1010 {
1011 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1012 }
1013
1014 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1015 {
1016 return ipvs->sysctl_sync_retries;
1017 }
1018
1019 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1020 {
1021 return ipvs->sysctl_sync_ver;
1022 }
1023
1024 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1025 {
1026 return ipvs->sysctl_sloppy_tcp;
1027 }
1028
1029 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1030 {
1031 return ipvs->sysctl_sloppy_sctp;
1032 }
1033
1034 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1035 {
1036 return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1037 }
1038
1039 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1040 {
1041 return ipvs->sysctl_sync_persist_mode;
1042 }
1043
1044 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1045 {
1046 return ipvs->sysctl_sync_qlen_max;
1047 }
1048
1049 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1050 {
1051 return ipvs->sysctl_sync_sock_size;
1052 }
1053
1054 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1055 {
1056 return ipvs->sysctl_pmtu_disc;
1057 }
1058
1059 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1060 {
1061 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1062 ipvs->sysctl_backup_only;
1063 }
1064
1065 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1066 {
1067 return ipvs->sysctl_conn_reuse_mode;
1068 }
1069
1070 #else
1071
1072 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1073 {
1074 return DEFAULT_SYNC_THRESHOLD;
1075 }
1076
1077 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1078 {
1079 return DEFAULT_SYNC_PERIOD;
1080 }
1081
1082 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1083 {
1084 return DEFAULT_SYNC_REFRESH_PERIOD;
1085 }
1086
1087 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1088 {
1089 return DEFAULT_SYNC_RETRIES & 3;
1090 }
1091
1092 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1093 {
1094 return DEFAULT_SYNC_VER;
1095 }
1096
1097 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1098 {
1099 return DEFAULT_SLOPPY_TCP;
1100 }
1101
1102 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1103 {
1104 return DEFAULT_SLOPPY_SCTP;
1105 }
1106
1107 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1108 {
1109 return 1;
1110 }
1111
1112 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1113 {
1114 return 0;
1115 }
1116
1117 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1118 {
1119 return IPVS_SYNC_QLEN_MAX;
1120 }
1121
1122 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1123 {
1124 return 0;
1125 }
1126
1127 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1128 {
1129 return 1;
1130 }
1131
1132 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1133 {
1134 return 0;
1135 }
1136
1137 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1138 {
1139 return 1;
1140 }
1141
1142 #endif
1143
1144 /* IPVS core functions
1145 * (from ip_vs_core.c)
1146 */
1147 const char *ip_vs_proto_name(unsigned int proto);
1148 void ip_vs_init_hash_table(struct list_head *table, int rows);
1149 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1150
1151 #define IP_VS_APP_TYPE_FTP 1
1152
1153 /* ip_vs_conn handling functions
1154 * (from ip_vs_conn.c)
1155 */
1156 enum {
1157 IP_VS_DIR_INPUT = 0,
1158 IP_VS_DIR_OUTPUT,
1159 IP_VS_DIR_INPUT_ONLY,
1160 IP_VS_DIR_LAST,
1161 };
1162
1163 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1164 const union nf_inet_addr *caddr,
1165 __be16 cport,
1166 const union nf_inet_addr *vaddr,
1167 __be16 vport,
1168 struct ip_vs_conn_param *p)
1169 {
1170 p->net = net;
1171 p->af = af;
1172 p->protocol = protocol;
1173 p->caddr = caddr;
1174 p->cport = cport;
1175 p->vaddr = vaddr;
1176 p->vport = vport;
1177 p->pe = NULL;
1178 p->pe_data = NULL;
1179 }
1180
1181 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1182 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1183
1184 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1185 const struct ip_vs_iphdr *iph,
1186 int inverse);
1187
1188 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1189
1190 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1191 const struct ip_vs_iphdr *iph,
1192 int inverse);
1193
1194 /* Get reference to gain full access to conn.
1195 * By default, RCU read-side critical sections have access only to
1196 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1197 */
1198 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1199 {
1200 return atomic_inc_not_zero(&cp->refcnt);
1201 }
1202
1203 /* put back the conn without restarting its timer */
1204 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1205 {
1206 smp_mb__before_atomic();
1207 atomic_dec(&cp->refcnt);
1208 }
1209 void ip_vs_conn_put(struct ip_vs_conn *cp);
1210 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1211
1212 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1213 const union nf_inet_addr *daddr,
1214 __be16 dport, unsigned int flags,
1215 struct ip_vs_dest *dest, __u32 fwmark);
1216 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1217
1218 const char *ip_vs_state_name(__u16 proto, int state);
1219
1220 void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1221 int ip_vs_check_template(struct ip_vs_conn *ct);
1222 void ip_vs_random_dropentry(struct net *net);
1223 int ip_vs_conn_init(void);
1224 void ip_vs_conn_cleanup(void);
1225
1226 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1227 {
1228 struct ip_vs_conn *ctl_cp = cp->control;
1229 if (!ctl_cp) {
1230 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1231 "%s:%d to %s:%d\n",
1232 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1233 ntohs(cp->cport),
1234 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1235 ntohs(cp->vport));
1236
1237 return;
1238 }
1239
1240 IP_VS_DBG_BUF(7, "DELeting control for: "
1241 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1242 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1243 ntohs(cp->cport),
1244 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1245 ntohs(ctl_cp->cport));
1246
1247 cp->control = NULL;
1248 if (atomic_read(&ctl_cp->n_control) == 0) {
1249 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1250 "%s:%d to %s:%d\n",
1251 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1252 ntohs(cp->cport),
1253 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1254 ntohs(cp->vport));
1255
1256 return;
1257 }
1258 atomic_dec(&ctl_cp->n_control);
1259 }
1260
1261 static inline void
1262 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1263 {
1264 if (cp->control) {
1265 IP_VS_ERR_BUF("request control ADD for already controlled: "
1266 "%s:%d to %s:%d\n",
1267 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1268 ntohs(cp->cport),
1269 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1270 ntohs(cp->vport));
1271
1272 ip_vs_control_del(cp);
1273 }
1274
1275 IP_VS_DBG_BUF(7, "ADDing control for: "
1276 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1277 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1278 ntohs(cp->cport),
1279 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1280 ntohs(ctl_cp->cport));
1281
1282 cp->control = ctl_cp;
1283 atomic_inc(&ctl_cp->n_control);
1284 }
1285
1286 /* IPVS netns init & cleanup functions */
1287 int ip_vs_estimator_net_init(struct net *net);
1288 int ip_vs_control_net_init(struct net *net);
1289 int ip_vs_protocol_net_init(struct net *net);
1290 int ip_vs_app_net_init(struct net *net);
1291 int ip_vs_conn_net_init(struct net *net);
1292 int ip_vs_sync_net_init(struct net *net);
1293 void ip_vs_conn_net_cleanup(struct net *net);
1294 void ip_vs_app_net_cleanup(struct net *net);
1295 void ip_vs_protocol_net_cleanup(struct net *net);
1296 void ip_vs_control_net_cleanup(struct net *net);
1297 void ip_vs_estimator_net_cleanup(struct net *net);
1298 void ip_vs_sync_net_cleanup(struct net *net);
1299 void ip_vs_service_net_cleanup(struct net *net);
1300
1301 /* IPVS application functions
1302 * (from ip_vs_app.c)
1303 */
1304 #define IP_VS_APP_MAX_PORTS 8
1305 struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1306 void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1307 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1308 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1309 int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
1310 __u16 port);
1311 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1312 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1313
1314 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1315 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1316
1317 int register_ip_vs_pe(struct ip_vs_pe *pe);
1318 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1319 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1320 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1321
1322 /* Use a #define to avoid all of module.h just for these trivial ops */
1323 #define ip_vs_pe_get(pe) \
1324 if (pe && pe->module) \
1325 __module_get(pe->module);
1326
1327 #define ip_vs_pe_put(pe) \
1328 if (pe && pe->module) \
1329 module_put(pe->module);
1330
1331 /* IPVS protocol functions (from ip_vs_proto.c) */
1332 int ip_vs_protocol_init(void);
1333 void ip_vs_protocol_cleanup(void);
1334 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1335 int *ip_vs_create_timeout_table(int *table, int size);
1336 int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1337 const char *name, int to);
1338 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1339 const struct sk_buff *skb, int offset,
1340 const char *msg);
1341
1342 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1343 extern struct ip_vs_protocol ip_vs_protocol_udp;
1344 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1345 extern struct ip_vs_protocol ip_vs_protocol_esp;
1346 extern struct ip_vs_protocol ip_vs_protocol_ah;
1347 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1348
1349 /* Registering/unregistering scheduler functions
1350 * (from ip_vs_sched.c)
1351 */
1352 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1353 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1354 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1355 struct ip_vs_scheduler *scheduler);
1356 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1357 struct ip_vs_scheduler *sched);
1358 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1359 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1360 struct ip_vs_conn *
1361 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1362 struct ip_vs_proto_data *pd, int *ignored,
1363 struct ip_vs_iphdr *iph);
1364 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1365 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1366
1367 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1368
1369 /* IPVS control data and functions (from ip_vs_ctl.c) */
1370 extern struct ip_vs_stats ip_vs_stats;
1371 extern int sysctl_ip_vs_sync_ver;
1372
1373 struct ip_vs_service *
1374 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1375 const union nf_inet_addr *vaddr, __be16 vport);
1376
1377 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1378 const union nf_inet_addr *daddr, __be16 dport);
1379
1380 int ip_vs_use_count_inc(void);
1381 void ip_vs_use_count_dec(void);
1382 int ip_vs_register_nl_ioctl(void);
1383 void ip_vs_unregister_nl_ioctl(void);
1384 int ip_vs_control_init(void);
1385 void ip_vs_control_cleanup(void);
1386 struct ip_vs_dest *
1387 ip_vs_find_dest(struct net *net, int svc_af, int dest_af,
1388 const union nf_inet_addr *daddr, __be16 dport,
1389 const union nf_inet_addr *vaddr, __be16 vport,
1390 __u16 protocol, __u32 fwmark, __u32 flags);
1391 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1392
1393 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1394 {
1395 atomic_inc(&dest->refcnt);
1396 }
1397
1398 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1399 {
1400 smp_mb__before_atomic();
1401 atomic_dec(&dest->refcnt);
1402 }
1403
1404 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1405 {
1406 if (atomic_dec_return(&dest->refcnt) < 0)
1407 kfree(dest);
1408 }
1409
1410 /* IPVS sync daemon data and function prototypes
1411 * (from ip_vs_sync.c)
1412 */
1413 int start_sync_thread(struct net *net, struct ipvs_sync_daemon_cfg *cfg,
1414 int state);
1415 int stop_sync_thread(struct net *net, int state);
1416 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1417
1418 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1419 void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1420 void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1421 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1422 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1423
1424 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1425 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1426 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1427 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1428 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1429 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1430 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1431 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1432 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1433 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1434 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1435 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1436 struct ip_vs_protocol *pp, int offset,
1437 unsigned int hooknum, struct ip_vs_iphdr *iph);
1438 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1439
1440 #ifdef CONFIG_IP_VS_IPV6
1441 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1442 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1443 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1446 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1447 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1448 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1449 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1450 struct ip_vs_protocol *pp, int offset,
1451 unsigned int hooknum, struct ip_vs_iphdr *iph);
1452 #endif
1453
1454 #ifdef CONFIG_SYSCTL
1455 /* This is a simple mechanism to ignore packets when
1456 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1457 * we start to drop 1/rate of the packets
1458 */
1459 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1460 {
1461 if (!ipvs->drop_rate)
1462 return 0;
1463 if (--ipvs->drop_counter > 0)
1464 return 0;
1465 ipvs->drop_counter = ipvs->drop_rate;
1466 return 1;
1467 }
1468 #else
1469 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1470 #endif
1471
1472 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1473 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1474
1475 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1476 {
1477 char fwd;
1478
1479 switch (IP_VS_FWD_METHOD(cp)) {
1480 case IP_VS_CONN_F_MASQ:
1481 fwd = 'M'; break;
1482 case IP_VS_CONN_F_LOCALNODE:
1483 fwd = 'L'; break;
1484 case IP_VS_CONN_F_TUNNEL:
1485 fwd = 'T'; break;
1486 case IP_VS_CONN_F_DROUTE:
1487 fwd = 'R'; break;
1488 case IP_VS_CONN_F_BYPASS:
1489 fwd = 'B'; break;
1490 default:
1491 fwd = '?'; break;
1492 }
1493 return fwd;
1494 }
1495
1496 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1497 struct ip_vs_conn *cp, int dir);
1498
1499 #ifdef CONFIG_IP_VS_IPV6
1500 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1501 struct ip_vs_conn *cp, int dir);
1502 #endif
1503
1504 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1505
1506 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1507 {
1508 __be32 diff[2] = { ~old, new };
1509
1510 return csum_partial(diff, sizeof(diff), oldsum);
1511 }
1512
1513 #ifdef CONFIG_IP_VS_IPV6
1514 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1515 __wsum oldsum)
1516 {
1517 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1518 new[3], new[2], new[1], new[0] };
1519
1520 return csum_partial(diff, sizeof(diff), oldsum);
1521 }
1522 #endif
1523
1524 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1525 {
1526 __be16 diff[2] = { ~old, new };
1527
1528 return csum_partial(diff, sizeof(diff), oldsum);
1529 }
1530
1531 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1532 static inline void ip_vs_notrack(struct sk_buff *skb)
1533 {
1534 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1535 enum ip_conntrack_info ctinfo;
1536 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1537
1538 if (!ct || !nf_ct_is_untracked(ct)) {
1539 nf_conntrack_put(skb->nfct);
1540 skb->nfct = &nf_ct_untracked_get()->ct_general;
1541 skb->nfctinfo = IP_CT_NEW;
1542 nf_conntrack_get(skb->nfct);
1543 }
1544 #endif
1545 }
1546
1547 #ifdef CONFIG_IP_VS_NFCT
1548 /* Netfilter connection tracking
1549 * (from ip_vs_nfct.c)
1550 */
1551 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1552 {
1553 #ifdef CONFIG_SYSCTL
1554 return ipvs->sysctl_conntrack;
1555 #else
1556 return 0;
1557 #endif
1558 }
1559
1560 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1561 int outin);
1562 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1563 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1564 struct ip_vs_conn *cp, u_int8_t proto,
1565 const __be16 port, int from_rs);
1566 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1567
1568 #else
1569
1570 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1571 {
1572 return 0;
1573 }
1574
1575 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1576 struct ip_vs_conn *cp, int outin)
1577 {
1578 }
1579
1580 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1581 {
1582 return NF_ACCEPT;
1583 }
1584
1585 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1586 {
1587 }
1588 #endif /* CONFIG_IP_VS_NFCT */
1589
1590 static inline int
1591 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1592 {
1593 /* We think the overhead of processing active connections is 256
1594 * times higher than that of inactive connections in average. (This
1595 * 256 times might not be accurate, we will change it later) We
1596 * use the following formula to estimate the overhead now:
1597 * dest->activeconns*256 + dest->inactconns
1598 */
1599 return (atomic_read(&dest->activeconns) << 8) +
1600 atomic_read(&dest->inactconns);
1601 }
1602
1603 #endif /* _NET_IP_VS_H */
Linux kernel - Deliverables
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