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net: accept UFO datagrams from tuntap and packet
[linux-2.6/btrfs-unstable.git] / include / net / ip_vs.h
blobff68cf288f9bf3a3ac18d696e215980e4fee54f5
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6 #ifndef _NET_IP_VS_H
7 #define _NET_IP_VS_H
8
9 #include <linux/ip_vs.h> /* definitions shared with userland */
10
11 #include <asm/types.h> /* for __uXX types */
12
13 #include <linux/list.h> /* for struct list_head */
14 #include <linux/spinlock.h> /* for struct rwlock_t */
15 #include <linux/atomic.h> /* for struct atomic_t */
16 #include <linux/refcount.h> /* for struct refcount_t */
17
18 #include <linux/compiler.h>
19 #include <linux/timer.h>
20 #include <linux/bug.h>
21
22 #include <net/checksum.h>
23 #include <linux/netfilter.h> /* for union nf_inet_addr */
24 #include <linux/ip.h>
25 #include <linux/ipv6.h> /* for struct ipv6hdr */
26 #include <net/ipv6.h>
27 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
28 #include <linux/netfilter_ipv6/ip6_tables.h>
29 #endif
30 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
31 #include <net/netfilter/nf_conntrack.h>
32 #endif
33 #include <net/net_namespace.h> /* Netw namespace */
34
35 #define IP_VS_HDR_INVERSE 1
36 #define IP_VS_HDR_ICMP 2
37
38 /* Generic access of ipvs struct */
39 static inline struct netns_ipvs *net_ipvs(struct net* net)
40 {
41 return net->ipvs;
42 }
43
44 /* This one needed for single_open_net since net is stored directly in
45 * private not as a struct i.e. seq_file_net can't be used.
46 */
47 static inline struct net *seq_file_single_net(struct seq_file *seq)
48 {
49 #ifdef CONFIG_NET_NS
50 return (struct net *)seq->private;
51 #else
52 return &init_net;
53 #endif
54 }
55
56 /* Connections' size value needed by ip_vs_ctl.c */
57 extern int ip_vs_conn_tab_size;
58
59 struct ip_vs_iphdr {
60 int hdr_flags; /* ipvs flags */
61 __u32 off; /* Where IP or IPv4 header starts */
62 __u32 len; /* IPv4 simply where L4 starts
63 * IPv6 where L4 Transport Header starts */
64 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
65 __s16 protocol;
66 __s32 flags;
67 union nf_inet_addr saddr;
68 union nf_inet_addr daddr;
69 };
70
71 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
72 int len, void *buffer,
73 const struct ip_vs_iphdr *ipvsh)
74 {
75 return skb_header_pointer(skb, offset, len, buffer);
76 }
77
78 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
79 * IPv6 requires some extra work, as finding proper header position,
80 * depend on the IPv6 extension headers.
81 */
82 static inline int
83 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
84 int hdr_flags, struct ip_vs_iphdr *iphdr)
85 {
86 iphdr->hdr_flags = hdr_flags;
87 iphdr->off = offset;
88
89 #ifdef CONFIG_IP_VS_IPV6
90 if (af == AF_INET6) {
91 struct ipv6hdr _iph;
92 const struct ipv6hdr *iph = skb_header_pointer(
93 skb, offset, sizeof(_iph), &_iph);
94 if (!iph)
95 return 0;
96
97 iphdr->saddr.in6 = iph->saddr;
98 iphdr->daddr.in6 = iph->daddr;
99 /* ipv6_find_hdr() updates len, flags */
100 iphdr->len = offset;
101 iphdr->flags = 0;
102 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
103 &iphdr->fragoffs,
104 &iphdr->flags);
105 if (iphdr->protocol < 0)
106 return 0;
107 } else
108 #endif
109 {
110 struct iphdr _iph;
111 const struct iphdr *iph = skb_header_pointer(
112 skb, offset, sizeof(_iph), &_iph);
113 if (!iph)
114 return 0;
115
116 iphdr->len = offset + iph->ihl * 4;
117 iphdr->fragoffs = 0;
118 iphdr->protocol = iph->protocol;
119 iphdr->saddr.ip = iph->saddr;
120 iphdr->daddr.ip = iph->daddr;
121 }
122
123 return 1;
124 }
125
126 static inline int
127 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
128 bool inverse, struct ip_vs_iphdr *iphdr)
129 {
130 int hdr_flags = IP_VS_HDR_ICMP;
131
132 if (inverse)
133 hdr_flags |= IP_VS_HDR_INVERSE;
134
135 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
136 }
137
138 static inline int
139 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
140 struct ip_vs_iphdr *iphdr)
141 {
142 int hdr_flags = 0;
143
144 if (inverse)
145 hdr_flags |= IP_VS_HDR_INVERSE;
146
147 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
148 hdr_flags, iphdr);
149 }
150
151 static inline bool
152 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
153 {
154 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
155 }
156
157 static inline bool
158 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
159 {
160 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
161 }
162
163 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
164 const union nf_inet_addr *src)
165 {
166 #ifdef CONFIG_IP_VS_IPV6
167 if (af == AF_INET6)
168 dst->in6 = src->in6;
169 else
170 #endif
171 dst->ip = src->ip;
172 }
173
174 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
175 const union nf_inet_addr *src)
176 {
177 #ifdef CONFIG_IP_VS_IPV6
178 if (af == AF_INET6) {
179 dst->in6 = src->in6;
180 return;
181 }
182 #endif
183 dst->ip = src->ip;
184 dst->all[1] = 0;
185 dst->all[2] = 0;
186 dst->all[3] = 0;
187 }
188
189 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
190 const union nf_inet_addr *b)
191 {
192 #ifdef CONFIG_IP_VS_IPV6
193 if (af == AF_INET6)
194 return ipv6_addr_equal(&a->in6, &b->in6);
195 #endif
196 return a->ip == b->ip;
197 }
198
199 #ifdef CONFIG_IP_VS_DEBUG
200 #include <linux/net.h>
201
202 int ip_vs_get_debug_level(void);
203
204 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
205 const union nf_inet_addr *addr,
206 int *idx)
207 {
208 int len;
209 #ifdef CONFIG_IP_VS_IPV6
210 if (af == AF_INET6)
211 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
212 &addr->in6) + 1;
213 else
214 #endif
215 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
216 &addr->ip) + 1;
217
218 *idx += len;
219 BUG_ON(*idx > buf_len + 1);
220 return &buf[*idx - len];
221 }
222
223 #define IP_VS_DBG_BUF(level, msg, ...) \
224 do { \
225 char ip_vs_dbg_buf[160]; \
226 int ip_vs_dbg_idx = 0; \
227 if (level <= ip_vs_get_debug_level()) \
228 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
229 } while (0)
230 #define IP_VS_ERR_BUF(msg...) \
231 do { \
232 char ip_vs_dbg_buf[160]; \
233 int ip_vs_dbg_idx = 0; \
234 pr_err(msg); \
235 } while (0)
236
237 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
238 #define IP_VS_DBG_ADDR(af, addr) \
239 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
240 sizeof(ip_vs_dbg_buf), addr, \
241 &ip_vs_dbg_idx)
242
243 #define IP_VS_DBG(level, msg, ...) \
244 do { \
245 if (level <= ip_vs_get_debug_level()) \
246 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
247 } while (0)
248 #define IP_VS_DBG_RL(msg, ...) \
249 do { \
250 if (net_ratelimit()) \
251 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
252 } while (0)
253 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
254 do { \
255 if (level <= ip_vs_get_debug_level()) \
256 pp->debug_packet(af, pp, skb, ofs, msg); \
257 } while (0)
258 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
259 do { \
260 if (level <= ip_vs_get_debug_level() && \
261 net_ratelimit()) \
262 pp->debug_packet(af, pp, skb, ofs, msg); \
263 } while (0)
264 #else /* NO DEBUGGING at ALL */
265 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
266 #define IP_VS_ERR_BUF(msg...) do {} while (0)
267 #define IP_VS_DBG(level, msg...) do {} while (0)
268 #define IP_VS_DBG_RL(msg...) do {} while (0)
269 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
270 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
271 #endif
272
273 #define IP_VS_BUG() BUG()
274 #define IP_VS_ERR_RL(msg, ...) \
275 do { \
276 if (net_ratelimit()) \
277 pr_err(msg, ##__VA_ARGS__); \
278 } while (0)
279
280 #ifdef CONFIG_IP_VS_DEBUG
281 #define EnterFunction(level) \
282 do { \
283 if (level <= ip_vs_get_debug_level()) \
284 printk(KERN_DEBUG \
285 pr_fmt("Enter: %s, %s line %i\n"), \
286 __func__, __FILE__, __LINE__); \
287 } while (0)
288 #define LeaveFunction(level) \
289 do { \
290 if (level <= ip_vs_get_debug_level()) \
291 printk(KERN_DEBUG \
292 pr_fmt("Leave: %s, %s line %i\n"), \
293 __func__, __FILE__, __LINE__); \
294 } while (0)
295 #else
296 #define EnterFunction(level) do {} while (0)
297 #define LeaveFunction(level) do {} while (0)
298 #endif
299
300 /* The port number of FTP service (in network order). */
301 #define FTPPORT cpu_to_be16(21)
302 #define FTPDATA cpu_to_be16(20)
303
304 /* TCP State Values */
305 enum {
306 IP_VS_TCP_S_NONE = 0,
307 IP_VS_TCP_S_ESTABLISHED,
308 IP_VS_TCP_S_SYN_SENT,
309 IP_VS_TCP_S_SYN_RECV,
310 IP_VS_TCP_S_FIN_WAIT,
311 IP_VS_TCP_S_TIME_WAIT,
312 IP_VS_TCP_S_CLOSE,
313 IP_VS_TCP_S_CLOSE_WAIT,
314 IP_VS_TCP_S_LAST_ACK,
315 IP_VS_TCP_S_LISTEN,
316 IP_VS_TCP_S_SYNACK,
317 IP_VS_TCP_S_LAST
318 };
319
320 /* UDP State Values */
321 enum {
322 IP_VS_UDP_S_NORMAL,
323 IP_VS_UDP_S_LAST,
324 };
325
326 /* ICMP State Values */
327 enum {
328 IP_VS_ICMP_S_NORMAL,
329 IP_VS_ICMP_S_LAST,
330 };
331
332 /* SCTP State Values */
333 enum ip_vs_sctp_states {
334 IP_VS_SCTP_S_NONE,
335 IP_VS_SCTP_S_INIT1,
336 IP_VS_SCTP_S_INIT,
337 IP_VS_SCTP_S_COOKIE_SENT,
338 IP_VS_SCTP_S_COOKIE_REPLIED,
339 IP_VS_SCTP_S_COOKIE_WAIT,
340 IP_VS_SCTP_S_COOKIE,
341 IP_VS_SCTP_S_COOKIE_ECHOED,
342 IP_VS_SCTP_S_ESTABLISHED,
343 IP_VS_SCTP_S_SHUTDOWN_SENT,
344 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
345 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
346 IP_VS_SCTP_S_REJECTED,
347 IP_VS_SCTP_S_CLOSED,
348 IP_VS_SCTP_S_LAST
349 };
350
351 /* Delta sequence info structure
352 * Each ip_vs_conn has 2 (output AND input seq. changes).
353 * Only used in the VS/NAT.
354 */
355 struct ip_vs_seq {
356 __u32 init_seq; /* Add delta from this seq */
357 __u32 delta; /* Delta in sequence numbers */
358 __u32 previous_delta; /* Delta in sequence numbers
359 * before last resized pkt */
360 };
361
362 /* counters per cpu */
363 struct ip_vs_counters {
364 __u64 conns; /* connections scheduled */
365 __u64 inpkts; /* incoming packets */
366 __u64 outpkts; /* outgoing packets */
367 __u64 inbytes; /* incoming bytes */
368 __u64 outbytes; /* outgoing bytes */
369 };
370 /* Stats per cpu */
371 struct ip_vs_cpu_stats {
372 struct ip_vs_counters cnt;
373 struct u64_stats_sync syncp;
374 };
375
376 /* IPVS statistics objects */
377 struct ip_vs_estimator {
378 struct list_head list;
379
380 u64 last_inbytes;
381 u64 last_outbytes;
382 u64 last_conns;
383 u64 last_inpkts;
384 u64 last_outpkts;
385
386 u64 cps;
387 u64 inpps;
388 u64 outpps;
389 u64 inbps;
390 u64 outbps;
391 };
392
393 /*
394 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
395 */
396 struct ip_vs_kstats {
397 u64 conns; /* connections scheduled */
398 u64 inpkts; /* incoming packets */
399 u64 outpkts; /* outgoing packets */
400 u64 inbytes; /* incoming bytes */
401 u64 outbytes; /* outgoing bytes */
402
403 u64 cps; /* current connection rate */
404 u64 inpps; /* current in packet rate */
405 u64 outpps; /* current out packet rate */
406 u64 inbps; /* current in byte rate */
407 u64 outbps; /* current out byte rate */
408 };
409
410 struct ip_vs_stats {
411 struct ip_vs_kstats kstats; /* kernel statistics */
412 struct ip_vs_estimator est; /* estimator */
413 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
414 spinlock_t lock; /* spin lock */
415 struct ip_vs_kstats kstats0; /* reset values */
416 };
417
418 struct dst_entry;
419 struct iphdr;
420 struct ip_vs_conn;
421 struct ip_vs_app;
422 struct sk_buff;
423 struct ip_vs_proto_data;
424
425 struct ip_vs_protocol {
426 struct ip_vs_protocol *next;
427 char *name;
428 u16 protocol;
429 u16 num_states;
430 int dont_defrag;
431
432 void (*init)(struct ip_vs_protocol *pp);
433
434 void (*exit)(struct ip_vs_protocol *pp);
435
436 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
437
438 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
439
440 int (*conn_schedule)(struct netns_ipvs *ipvs,
441 int af, struct sk_buff *skb,
442 struct ip_vs_proto_data *pd,
443 int *verdict, struct ip_vs_conn **cpp,
444 struct ip_vs_iphdr *iph);
445
446 struct ip_vs_conn *
447 (*conn_in_get)(struct netns_ipvs *ipvs,
448 int af,
449 const struct sk_buff *skb,
450 const struct ip_vs_iphdr *iph);
451
452 struct ip_vs_conn *
453 (*conn_out_get)(struct netns_ipvs *ipvs,
454 int af,
455 const struct sk_buff *skb,
456 const struct ip_vs_iphdr *iph);
457
458 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
459 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
460
461 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
462 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
463
464 int (*csum_check)(int af, struct sk_buff *skb,
465 struct ip_vs_protocol *pp);
466
467 const char *(*state_name)(int state);
468
469 void (*state_transition)(struct ip_vs_conn *cp, int direction,
470 const struct sk_buff *skb,
471 struct ip_vs_proto_data *pd);
472
473 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
474
475 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
476
477 int (*app_conn_bind)(struct ip_vs_conn *cp);
478
479 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
480 const struct sk_buff *skb,
481 int offset,
482 const char *msg);
483
484 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
485 };
486
487 /* protocol data per netns */
488 struct ip_vs_proto_data {
489 struct ip_vs_proto_data *next;
490 struct ip_vs_protocol *pp;
491 int *timeout_table; /* protocol timeout table */
492 atomic_t appcnt; /* counter of proto app incs. */
493 struct tcp_states_t *tcp_state_table;
494 };
495
496 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
497 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
498 unsigned short proto);
499
500 struct ip_vs_conn_param {
501 struct netns_ipvs *ipvs;
502 const union nf_inet_addr *caddr;
503 const union nf_inet_addr *vaddr;
504 __be16 cport;
505 __be16 vport;
506 __u16 protocol;
507 u16 af;
508
509 const struct ip_vs_pe *pe;
510 char *pe_data;
511 __u8 pe_data_len;
512 };
513
514 /* IP_VS structure allocated for each dynamically scheduled connection */
515 struct ip_vs_conn {
516 struct hlist_node c_list; /* hashed list heads */
517 /* Protocol, addresses and port numbers */
518 __be16 cport;
519 __be16 dport;
520 __be16 vport;
521 u16 af; /* address family */
522 union nf_inet_addr caddr; /* client address */
523 union nf_inet_addr vaddr; /* virtual address */
524 union nf_inet_addr daddr; /* destination address */
525 volatile __u32 flags; /* status flags */
526 __u16 protocol; /* Which protocol (TCP/UDP) */
527 __u16 daf; /* Address family of the dest */
528 struct netns_ipvs *ipvs;
529
530 /* counter and timer */
531 refcount_t refcnt; /* reference count */
532 struct timer_list timer; /* Expiration timer */
533 volatile unsigned long timeout; /* timeout */
534
535 /* Flags and state transition */
536 spinlock_t lock; /* lock for state transition */
537 volatile __u16 state; /* state info */
538 volatile __u16 old_state; /* old state, to be used for
539 * state transition triggerd
540 * synchronization
541 */
542 __u32 fwmark; /* Fire wall mark from skb */
543 unsigned long sync_endtime; /* jiffies + sent_retries */
544
545 /* Control members */
546 struct ip_vs_conn *control; /* Master control connection */
547 atomic_t n_control; /* Number of controlled ones */
548 struct ip_vs_dest *dest; /* real server */
549 atomic_t in_pkts; /* incoming packet counter */
550
551 /* Packet transmitter for different forwarding methods. If it
552 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
553 * otherwise this must be changed to a sk_buff **.
554 * NF_ACCEPT can be returned when destination is local.
555 */
556 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
557 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
558
559 /* Note: we can group the following members into a structure,
560 * in order to save more space, and the following members are
561 * only used in VS/NAT anyway
562 */
563 struct ip_vs_app *app; /* bound ip_vs_app object */
564 void *app_data; /* Application private data */
565 struct ip_vs_seq in_seq; /* incoming seq. struct */
566 struct ip_vs_seq out_seq; /* outgoing seq. struct */
567
568 const struct ip_vs_pe *pe;
569 char *pe_data;
570 __u8 pe_data_len;
571
572 struct rcu_head rcu_head;
573 };
574
575 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
576 * for IPv6 support.
577 *
578 * We need these to conveniently pass around service and destination
579 * options, but unfortunately, we also need to keep the old definitions to
580 * maintain userspace backwards compatibility for the setsockopt interface.
581 */
582 struct ip_vs_service_user_kern {
583 /* virtual service addresses */
584 u16 af;
585 u16 protocol;
586 union nf_inet_addr addr; /* virtual ip address */
587 __be16 port;
588 u32 fwmark; /* firwall mark of service */
589
590 /* virtual service options */
591 char *sched_name;
592 char *pe_name;
593 unsigned int flags; /* virtual service flags */
594 unsigned int timeout; /* persistent timeout in sec */
595 __be32 netmask; /* persistent netmask or plen */
596 };
597
598
599 struct ip_vs_dest_user_kern {
600 /* destination server address */
601 union nf_inet_addr addr;
602 __be16 port;
603
604 /* real server options */
605 unsigned int conn_flags; /* connection flags */
606 int weight; /* destination weight */
607
608 /* thresholds for active connections */
609 u32 u_threshold; /* upper threshold */
610 u32 l_threshold; /* lower threshold */
611
612 /* Address family of addr */
613 u16 af;
614 };
615
616
617 /*
618 * The information about the virtual service offered to the net and the
619 * forwarding entries.
620 */
621 struct ip_vs_service {
622 struct hlist_node s_list; /* for normal service table */
623 struct hlist_node f_list; /* for fwmark-based service table */
624 atomic_t refcnt; /* reference counter */
625
626 u16 af; /* address family */
627 __u16 protocol; /* which protocol (TCP/UDP) */
628 union nf_inet_addr addr; /* IP address for virtual service */
629 __be16 port; /* port number for the service */
630 __u32 fwmark; /* firewall mark of the service */
631 unsigned int flags; /* service status flags */
632 unsigned int timeout; /* persistent timeout in ticks */
633 __be32 netmask; /* grouping granularity, mask/plen */
634 struct netns_ipvs *ipvs;
635
636 struct list_head destinations; /* real server d-linked list */
637 __u32 num_dests; /* number of servers */
638 struct ip_vs_stats stats; /* statistics for the service */
639
640 /* for scheduling */
641 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
642 spinlock_t sched_lock; /* lock sched_data */
643 void *sched_data; /* scheduler application data */
644
645 /* alternate persistence engine */
646 struct ip_vs_pe __rcu *pe;
647
648 struct rcu_head rcu_head;
649 };
650
651 /* Information for cached dst */
652 struct ip_vs_dest_dst {
653 struct dst_entry *dst_cache; /* destination cache entry */
654 u32 dst_cookie;
655 union nf_inet_addr dst_saddr;
656 struct rcu_head rcu_head;
657 };
658
659 /* The real server destination forwarding entry with ip address, port number,
660 * and so on.
661 */
662 struct ip_vs_dest {
663 struct list_head n_list; /* for the dests in the service */
664 struct hlist_node d_list; /* for table with all the dests */
665
666 u16 af; /* address family */
667 __be16 port; /* port number of the server */
668 union nf_inet_addr addr; /* IP address of the server */
669 volatile unsigned int flags; /* dest status flags */
670 atomic_t conn_flags; /* flags to copy to conn */
671 atomic_t weight; /* server weight */
672
673 refcount_t refcnt; /* reference counter */
674 struct ip_vs_stats stats; /* statistics */
675 unsigned long idle_start; /* start time, jiffies */
676
677 /* connection counters and thresholds */
678 atomic_t activeconns; /* active connections */
679 atomic_t inactconns; /* inactive connections */
680 atomic_t persistconns; /* persistent connections */
681 __u32 u_threshold; /* upper threshold */
682 __u32 l_threshold; /* lower threshold */
683
684 /* for destination cache */
685 spinlock_t dst_lock; /* lock of dst_cache */
686 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
687
688 /* for virtual service */
689 struct ip_vs_service __rcu *svc; /* service it belongs to */
690 __u16 protocol; /* which protocol (TCP/UDP) */
691 __be16 vport; /* virtual port number */
692 union nf_inet_addr vaddr; /* virtual IP address */
693 __u32 vfwmark; /* firewall mark of service */
694
695 struct list_head t_list; /* in dest_trash */
696 unsigned int in_rs_table:1; /* we are in rs_table */
697 };
698
699 /* The scheduler object */
700 struct ip_vs_scheduler {
701 struct list_head n_list; /* d-linked list head */
702 char *name; /* scheduler name */
703 atomic_t refcnt; /* reference counter */
704 struct module *module; /* THIS_MODULE/NULL */
705
706 /* scheduler initializing service */
707 int (*init_service)(struct ip_vs_service *svc);
708 /* scheduling service finish */
709 void (*done_service)(struct ip_vs_service *svc);
710 /* dest is linked */
711 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712 /* dest is unlinked */
713 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
714 /* dest is updated */
715 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
716
717 /* selecting a server from the given service */
718 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
719 const struct sk_buff *skb,
720 struct ip_vs_iphdr *iph);
721 };
722
723 /* The persistence engine object */
724 struct ip_vs_pe {
725 struct list_head n_list; /* d-linked list head */
726 char *name; /* scheduler name */
727 atomic_t refcnt; /* reference counter */
728 struct module *module; /* THIS_MODULE/NULL */
729
730 /* get the connection template, if any */
731 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
732 bool (*ct_match)(const struct ip_vs_conn_param *p,
733 struct ip_vs_conn *ct);
734 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
735 bool inverse);
736 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
737 /* create connections for real-server outgoing packets */
738 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
739 struct ip_vs_dest *dest,
740 struct sk_buff *skb,
741 const struct ip_vs_iphdr *iph,
742 __be16 dport, __be16 cport);
743 };
744
745 /* The application module object (a.k.a. app incarnation) */
746 struct ip_vs_app {
747 struct list_head a_list; /* member in app list */
748 int type; /* IP_VS_APP_TYPE_xxx */
749 char *name; /* application module name */
750 __u16 protocol;
751 struct module *module; /* THIS_MODULE/NULL */
752 struct list_head incs_list; /* list of incarnations */
753
754 /* members for application incarnations */
755 struct list_head p_list; /* member in proto app list */
756 struct ip_vs_app *app; /* its real application */
757 __be16 port; /* port number in net order */
758 atomic_t usecnt; /* usage counter */
759 struct rcu_head rcu_head;
760
761 /* output hook: Process packet in inout direction, diff set for TCP.
762 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
763 * 2=Mangled but checksum was not updated
764 */
765 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
766 struct sk_buff *, int *diff);
767
768 /* input hook: Process packet in outin direction, diff set for TCP.
769 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
770 * 2=Mangled but checksum was not updated
771 */
772 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
773 struct sk_buff *, int *diff);
774
775 /* ip_vs_app initializer */
776 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
777
778 /* ip_vs_app finish */
779 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
780
781
782 /* not used now */
783 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
784 struct ip_vs_protocol *);
785
786 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
787
788 int * timeout_table;
789 int * timeouts;
790 int timeouts_size;
791
792 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
793 int *verdict, struct ip_vs_conn **cpp);
794
795 struct ip_vs_conn *
796 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
797 const struct iphdr *iph, int inverse);
798
799 struct ip_vs_conn *
800 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
801 const struct iphdr *iph, int inverse);
802
803 int (*state_transition)(struct ip_vs_conn *cp, int direction,
804 const struct sk_buff *skb,
805 struct ip_vs_app *app);
806
807 void (*timeout_change)(struct ip_vs_app *app, int flags);
808 };
809
810 struct ipvs_master_sync_state {
811 struct list_head sync_queue;
812 struct ip_vs_sync_buff *sync_buff;
813 unsigned long sync_queue_len;
814 unsigned int sync_queue_delay;
815 struct task_struct *master_thread;
816 struct delayed_work master_wakeup_work;
817 struct netns_ipvs *ipvs;
818 };
819
820 /* How much time to keep dests in trash */
821 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
822
823 struct ipvs_sync_daemon_cfg {
824 union nf_inet_addr mcast_group;
825 int syncid;
826 u16 sync_maxlen;
827 u16 mcast_port;
828 u8 mcast_af;
829 u8 mcast_ttl;
830 /* multicast interface name */
831 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
832 };
833
834 /* IPVS in network namespace */
835 struct netns_ipvs {
836 int gen; /* Generation */
837 int enable; /* enable like nf_hooks do */
838 /* Hash table: for real service lookups */
839 #define IP_VS_RTAB_BITS 4
840 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
841 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
842
843 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
844 /* ip_vs_app */
845 struct list_head app_list;
846 /* ip_vs_proto */
847 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
848 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
849 /* ip_vs_proto_tcp */
850 #ifdef CONFIG_IP_VS_PROTO_TCP
851 #define TCP_APP_TAB_BITS 4
852 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
853 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
854 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
855 #endif
856 /* ip_vs_proto_udp */
857 #ifdef CONFIG_IP_VS_PROTO_UDP
858 #define UDP_APP_TAB_BITS 4
859 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
860 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
861 struct list_head udp_apps[UDP_APP_TAB_SIZE];
862 #endif
863 /* ip_vs_proto_sctp */
864 #ifdef CONFIG_IP_VS_PROTO_SCTP
865 #define SCTP_APP_TAB_BITS 4
866 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
867 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
868 /* Hash table for SCTP application incarnations */
869 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
870 #endif
871 /* ip_vs_conn */
872 atomic_t conn_count; /* connection counter */
873
874 /* ip_vs_ctl */
875 struct ip_vs_stats tot_stats; /* Statistics & est. */
876
877 int num_services; /* no of virtual services */
878
879 /* Trash for destinations */
880 struct list_head dest_trash;
881 spinlock_t dest_trash_lock;
882 struct timer_list dest_trash_timer; /* expiration timer */
883 /* Service counters */
884 atomic_t ftpsvc_counter;
885 atomic_t nullsvc_counter;
886 atomic_t conn_out_counter;
887
888 #ifdef CONFIG_SYSCTL
889 /* 1/rate drop and drop-entry variables */
890 struct delayed_work defense_work; /* Work handler */
891 int drop_rate;
892 int drop_counter;
893 atomic_t dropentry;
894 /* locks in ctl.c */
895 spinlock_t dropentry_lock; /* drop entry handling */
896 spinlock_t droppacket_lock; /* drop packet handling */
897 spinlock_t securetcp_lock; /* state and timeout tables */
898
899 /* sys-ctl struct */
900 struct ctl_table_header *sysctl_hdr;
901 struct ctl_table *sysctl_tbl;
902 #endif
903
904 /* sysctl variables */
905 int sysctl_amemthresh;
906 int sysctl_am_droprate;
907 int sysctl_drop_entry;
908 int sysctl_drop_packet;
909 int sysctl_secure_tcp;
910 #ifdef CONFIG_IP_VS_NFCT
911 int sysctl_conntrack;
912 #endif
913 int sysctl_snat_reroute;
914 int sysctl_sync_ver;
915 int sysctl_sync_ports;
916 int sysctl_sync_persist_mode;
917 unsigned long sysctl_sync_qlen_max;
918 int sysctl_sync_sock_size;
919 int sysctl_cache_bypass;
920 int sysctl_expire_nodest_conn;
921 int sysctl_sloppy_tcp;
922 int sysctl_sloppy_sctp;
923 int sysctl_expire_quiescent_template;
924 int sysctl_sync_threshold[2];
925 unsigned int sysctl_sync_refresh_period;
926 int sysctl_sync_retries;
927 int sysctl_nat_icmp_send;
928 int sysctl_pmtu_disc;
929 int sysctl_backup_only;
930 int sysctl_conn_reuse_mode;
931 int sysctl_schedule_icmp;
932 int sysctl_ignore_tunneled;
933
934 /* ip_vs_lblc */
935 int sysctl_lblc_expiration;
936 struct ctl_table_header *lblc_ctl_header;
937 struct ctl_table *lblc_ctl_table;
938 /* ip_vs_lblcr */
939 int sysctl_lblcr_expiration;
940 struct ctl_table_header *lblcr_ctl_header;
941 struct ctl_table *lblcr_ctl_table;
942 /* ip_vs_est */
943 struct list_head est_list; /* estimator list */
944 spinlock_t est_lock;
945 struct timer_list est_timer; /* Estimation timer */
946 /* ip_vs_sync */
947 spinlock_t sync_lock;
948 struct ipvs_master_sync_state *ms;
949 spinlock_t sync_buff_lock;
950 struct task_struct **backup_threads;
951 int threads_mask;
952 volatile int sync_state;
953 struct mutex sync_mutex;
954 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
955 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
956 /* net name space ptr */
957 struct net *net; /* Needed by timer routines */
958 /* Number of heterogeneous destinations, needed becaus heterogeneous
959 * are not supported when synchronization is enabled.
960 */
961 unsigned int mixed_address_family_dests;
962 };
963
964 #define DEFAULT_SYNC_THRESHOLD 3
965 #define DEFAULT_SYNC_PERIOD 50
966 #define DEFAULT_SYNC_VER 1
967 #define DEFAULT_SLOPPY_TCP 0
968 #define DEFAULT_SLOPPY_SCTP 0
969 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
970 #define DEFAULT_SYNC_RETRIES 0
971 #define IPVS_SYNC_WAKEUP_RATE 8
972 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
973 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
974 #define IPVS_SYNC_CHECK_PERIOD HZ
975 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
976 #define IPVS_SYNC_PORTS_MAX (1 << 6)
977
978 #ifdef CONFIG_SYSCTL
979
980 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
981 {
982 return ipvs->sysctl_sync_threshold[0];
983 }
984
985 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
986 {
987 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
988 }
989
990 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
991 {
992 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
993 }
994
995 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
996 {
997 return ipvs->sysctl_sync_retries;
998 }
999
1000 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1001 {
1002 return ipvs->sysctl_sync_ver;
1003 }
1004
1005 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1006 {
1007 return ipvs->sysctl_sloppy_tcp;
1008 }
1009
1010 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1011 {
1012 return ipvs->sysctl_sloppy_sctp;
1013 }
1014
1015 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1016 {
1017 return READ_ONCE(ipvs->sysctl_sync_ports);
1018 }
1019
1020 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1021 {
1022 return ipvs->sysctl_sync_persist_mode;
1023 }
1024
1025 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1026 {
1027 return ipvs->sysctl_sync_qlen_max;
1028 }
1029
1030 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1031 {
1032 return ipvs->sysctl_sync_sock_size;
1033 }
1034
1035 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1036 {
1037 return ipvs->sysctl_pmtu_disc;
1038 }
1039
1040 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1041 {
1042 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1043 ipvs->sysctl_backup_only;
1044 }
1045
1046 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1047 {
1048 return ipvs->sysctl_conn_reuse_mode;
1049 }
1050
1051 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1052 {
1053 return ipvs->sysctl_schedule_icmp;
1054 }
1055
1056 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1057 {
1058 return ipvs->sysctl_ignore_tunneled;
1059 }
1060
1061 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1062 {
1063 return ipvs->sysctl_cache_bypass;
1064 }
1065
1066 #else
1067
1068 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1069 {
1070 return DEFAULT_SYNC_THRESHOLD;
1071 }
1072
1073 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1074 {
1075 return DEFAULT_SYNC_PERIOD;
1076 }
1077
1078 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1079 {
1080 return DEFAULT_SYNC_REFRESH_PERIOD;
1081 }
1082
1083 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1084 {
1085 return DEFAULT_SYNC_RETRIES & 3;
1086 }
1087
1088 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1089 {
1090 return DEFAULT_SYNC_VER;
1091 }
1092
1093 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1094 {
1095 return DEFAULT_SLOPPY_TCP;
1096 }
1097
1098 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1099 {
1100 return DEFAULT_SLOPPY_SCTP;
1101 }
1102
1103 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1104 {
1105 return 1;
1106 }
1107
1108 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1109 {
1110 return 0;
1111 }
1112
1113 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1114 {
1115 return IPVS_SYNC_QLEN_MAX;
1116 }
1117
1118 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1119 {
1120 return 0;
1121 }
1122
1123 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1124 {
1125 return 1;
1126 }
1127
1128 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1129 {
1130 return 0;
1131 }
1132
1133 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1134 {
1135 return 1;
1136 }
1137
1138 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1139 {
1140 return 0;
1141 }
1142
1143 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1144 {
1145 return 0;
1146 }
1147
1148 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1149 {
1150 return 0;
1151 }
1152
1153 #endif
1154
1155 /* IPVS core functions
1156 * (from ip_vs_core.c)
1157 */
1158 const char *ip_vs_proto_name(unsigned int proto);
1159 void ip_vs_init_hash_table(struct list_head *table, int rows);
1160 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1161 struct ip_vs_dest *dest,
1162 struct sk_buff *skb,
1163 const struct ip_vs_iphdr *iph,
1164 __be16 dport,
1165 __be16 cport);
1166 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1167
1168 #define IP_VS_APP_TYPE_FTP 1
1169
1170 /* ip_vs_conn handling functions
1171 * (from ip_vs_conn.c)
1172 */
1173 enum {
1174 IP_VS_DIR_INPUT = 0,
1175 IP_VS_DIR_OUTPUT,
1176 IP_VS_DIR_INPUT_ONLY,
1177 IP_VS_DIR_LAST,
1178 };
1179
1180 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1181 const union nf_inet_addr *caddr,
1182 __be16 cport,
1183 const union nf_inet_addr *vaddr,
1184 __be16 vport,
1185 struct ip_vs_conn_param *p)
1186 {
1187 p->ipvs = ipvs;
1188 p->af = af;
1189 p->protocol = protocol;
1190 p->caddr = caddr;
1191 p->cport = cport;
1192 p->vaddr = vaddr;
1193 p->vport = vport;
1194 p->pe = NULL;
1195 p->pe_data = NULL;
1196 }
1197
1198 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1199 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1200
1201 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1202 const struct sk_buff *skb,
1203 const struct ip_vs_iphdr *iph);
1204
1205 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1206
1207 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1208 const struct sk_buff *skb,
1209 const struct ip_vs_iphdr *iph);
1210
1211 /* Get reference to gain full access to conn.
1212 * By default, RCU read-side critical sections have access only to
1213 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1214 */
1215 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1216 {
1217 return refcount_inc_not_zero(&cp->refcnt);
1218 }
1219
1220 /* put back the conn without restarting its timer */
1221 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1222 {
1223 smp_mb__before_atomic();
1224 refcount_dec(&cp->refcnt);
1225 }
1226 void ip_vs_conn_put(struct ip_vs_conn *cp);
1227 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1228
1229 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1230 const union nf_inet_addr *daddr,
1231 __be16 dport, unsigned int flags,
1232 struct ip_vs_dest *dest, __u32 fwmark);
1233 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1234
1235 const char *ip_vs_state_name(__u16 proto, int state);
1236
1237 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1238 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1239 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1240 int ip_vs_conn_init(void);
1241 void ip_vs_conn_cleanup(void);
1242
1243 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1244 {
1245 struct ip_vs_conn *ctl_cp = cp->control;
1246 if (!ctl_cp) {
1247 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1248 "%s:%d to %s:%d\n",
1249 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1250 ntohs(cp->cport),
1251 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1252 ntohs(cp->vport));
1253
1254 return;
1255 }
1256
1257 IP_VS_DBG_BUF(7, "DELeting control for: "
1258 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1259 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1260 ntohs(cp->cport),
1261 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1262 ntohs(ctl_cp->cport));
1263
1264 cp->control = NULL;
1265 if (atomic_read(&ctl_cp->n_control) == 0) {
1266 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1267 "%s:%d to %s:%d\n",
1268 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1269 ntohs(cp->cport),
1270 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1271 ntohs(cp->vport));
1272
1273 return;
1274 }
1275 atomic_dec(&ctl_cp->n_control);
1276 }
1277
1278 static inline void
1279 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1280 {
1281 if (cp->control) {
1282 IP_VS_ERR_BUF("request control ADD for already controlled: "
1283 "%s:%d to %s:%d\n",
1284 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1285 ntohs(cp->cport),
1286 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1287 ntohs(cp->vport));
1288
1289 ip_vs_control_del(cp);
1290 }
1291
1292 IP_VS_DBG_BUF(7, "ADDing control for: "
1293 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1294 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1295 ntohs(cp->cport),
1296 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1297 ntohs(ctl_cp->cport));
1298
1299 cp->control = ctl_cp;
1300 atomic_inc(&ctl_cp->n_control);
1301 }
1302
1303 /* IPVS netns init & cleanup functions */
1304 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1305 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1306 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1307 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1308 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1309 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1310 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1311 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1312 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1313 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1314 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1315 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1316 void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1317
1318 /* IPVS application functions
1319 * (from ip_vs_app.c)
1320 */
1321 #define IP_VS_APP_MAX_PORTS 8
1322 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1323 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1324 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1325 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1326 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1327 __u16 port);
1328 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1329 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1330
1331 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1332 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1333
1334 int register_ip_vs_pe(struct ip_vs_pe *pe);
1335 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1336 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1337 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1338
1339 /* Use a #define to avoid all of module.h just for these trivial ops */
1340 #define ip_vs_pe_get(pe) \
1341 if (pe && pe->module) \
1342 __module_get(pe->module);
1343
1344 #define ip_vs_pe_put(pe) \
1345 if (pe && pe->module) \
1346 module_put(pe->module);
1347
1348 /* IPVS protocol functions (from ip_vs_proto.c) */
1349 int ip_vs_protocol_init(void);
1350 void ip_vs_protocol_cleanup(void);
1351 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1352 int *ip_vs_create_timeout_table(int *table, int size);
1353 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1354 const struct sk_buff *skb, int offset,
1355 const char *msg);
1356
1357 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1358 extern struct ip_vs_protocol ip_vs_protocol_udp;
1359 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1360 extern struct ip_vs_protocol ip_vs_protocol_esp;
1361 extern struct ip_vs_protocol ip_vs_protocol_ah;
1362 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1363
1364 /* Registering/unregistering scheduler functions
1365 * (from ip_vs_sched.c)
1366 */
1367 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1368 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1369 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1370 struct ip_vs_scheduler *scheduler);
1371 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1372 struct ip_vs_scheduler *sched);
1373 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1374 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1375 struct ip_vs_conn *
1376 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1377 struct ip_vs_proto_data *pd, int *ignored,
1378 struct ip_vs_iphdr *iph);
1379 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1380 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1381
1382 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1383
1384 /* IPVS control data and functions (from ip_vs_ctl.c) */
1385 extern struct ip_vs_stats ip_vs_stats;
1386 extern int sysctl_ip_vs_sync_ver;
1387
1388 struct ip_vs_service *
1389 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1390 const union nf_inet_addr *vaddr, __be16 vport);
1391
1392 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1393 const union nf_inet_addr *daddr, __be16 dport);
1394
1395 struct ip_vs_dest *
1396 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1397 const union nf_inet_addr *daddr, __be16 dport);
1398
1399 int ip_vs_use_count_inc(void);
1400 void ip_vs_use_count_dec(void);
1401 int ip_vs_register_nl_ioctl(void);
1402 void ip_vs_unregister_nl_ioctl(void);
1403 int ip_vs_control_init(void);
1404 void ip_vs_control_cleanup(void);
1405 struct ip_vs_dest *
1406 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1407 const union nf_inet_addr *daddr, __be16 dport,
1408 const union nf_inet_addr *vaddr, __be16 vport,
1409 __u16 protocol, __u32 fwmark, __u32 flags);
1410 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1411
1412 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1413 {
1414 refcount_inc(&dest->refcnt);
1415 }
1416
1417 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1418 {
1419 smp_mb__before_atomic();
1420 refcount_dec(&dest->refcnt);
1421 }
1422
1423 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1424 {
1425 if (refcount_dec_and_test(&dest->refcnt))
1426 kfree(dest);
1427 }
1428
1429 /* IPVS sync daemon data and function prototypes
1430 * (from ip_vs_sync.c)
1431 */
1432 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1433 int state);
1434 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1435 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1436
1437 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1438 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1439 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1440 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1441 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1442
1443 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1444 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1445 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1446 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1447 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1448 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1449 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1450 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1451 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1452 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1453 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1454 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1455 struct ip_vs_protocol *pp, int offset,
1456 unsigned int hooknum, struct ip_vs_iphdr *iph);
1457 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1458
1459 #ifdef CONFIG_IP_VS_IPV6
1460 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1461 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1462 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1463 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1464 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1465 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1466 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1467 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1468 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1469 struct ip_vs_protocol *pp, int offset,
1470 unsigned int hooknum, struct ip_vs_iphdr *iph);
1471 #endif
1472
1473 #ifdef CONFIG_SYSCTL
1474 /* This is a simple mechanism to ignore packets when
1475 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1476 * we start to drop 1/rate of the packets
1477 */
1478 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1479 {
1480 if (!ipvs->drop_rate)
1481 return 0;
1482 if (--ipvs->drop_counter > 0)
1483 return 0;
1484 ipvs->drop_counter = ipvs->drop_rate;
1485 return 1;
1486 }
1487 #else
1488 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1489 #endif
1490
1491 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1492 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1493
1494 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1495 {
1496 char fwd;
1497
1498 switch (IP_VS_FWD_METHOD(cp)) {
1499 case IP_VS_CONN_F_MASQ:
1500 fwd = 'M'; break;
1501 case IP_VS_CONN_F_LOCALNODE:
1502 fwd = 'L'; break;
1503 case IP_VS_CONN_F_TUNNEL:
1504 fwd = 'T'; break;
1505 case IP_VS_CONN_F_DROUTE:
1506 fwd = 'R'; break;
1507 case IP_VS_CONN_F_BYPASS:
1508 fwd = 'B'; break;
1509 default:
1510 fwd = '?'; break;
1511 }
1512 return fwd;
1513 }
1514
1515 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1516 struct ip_vs_conn *cp, int dir);
1517
1518 #ifdef CONFIG_IP_VS_IPV6
1519 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1520 struct ip_vs_conn *cp, int dir);
1521 #endif
1522
1523 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1524
1525 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1526 {
1527 __be32 diff[2] = { ~old, new };
1528
1529 return csum_partial(diff, sizeof(diff), oldsum);
1530 }
1531
1532 #ifdef CONFIG_IP_VS_IPV6
1533 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1534 __wsum oldsum)
1535 {
1536 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1537 new[3], new[2], new[1], new[0] };
1538
1539 return csum_partial(diff, sizeof(diff), oldsum);
1540 }
1541 #endif
1542
1543 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1544 {
1545 __be16 diff[2] = { ~old, new };
1546
1547 return csum_partial(diff, sizeof(diff), oldsum);
1548 }
1549
1550 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1551 static inline void ip_vs_notrack(struct sk_buff *skb)
1552 {
1553 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1554 enum ip_conntrack_info ctinfo;
1555 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1556
1557 if (ct) {
1558 nf_conntrack_put(&ct->ct_general);
1559 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1560 }
1561 #endif
1562 }
1563
1564 #ifdef CONFIG_IP_VS_NFCT
1565 /* Netfilter connection tracking
1566 * (from ip_vs_nfct.c)
1567 */
1568 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1569 {
1570 #ifdef CONFIG_SYSCTL
1571 return ipvs->sysctl_conntrack;
1572 #else
1573 return 0;
1574 #endif
1575 }
1576
1577 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1578 int outin);
1579 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1580 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1581 struct ip_vs_conn *cp, u_int8_t proto,
1582 const __be16 port, int from_rs);
1583 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1584
1585 #else
1586
1587 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1588 {
1589 return 0;
1590 }
1591
1592 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1593 struct ip_vs_conn *cp, int outin)
1594 {
1595 }
1596
1597 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1598 {
1599 return NF_ACCEPT;
1600 }
1601
1602 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1603 {
1604 }
1605 #endif /* CONFIG_IP_VS_NFCT */
1606
1607 /* Really using conntrack? */
1608 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1609 struct sk_buff *skb)
1610 {
1611 #ifdef CONFIG_IP_VS_NFCT
1612 enum ip_conntrack_info ctinfo;
1613 struct nf_conn *ct;
1614
1615 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1616 return false;
1617 ct = nf_ct_get(skb, &ctinfo);
1618 if (ct)
1619 return true;
1620 #endif
1621 return false;
1622 }
1623
1624 static inline int
1625 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1626 {
1627 /* We think the overhead of processing active connections is 256
1628 * times higher than that of inactive connections in average. (This
1629 * 256 times might not be accurate, we will change it later) We
1630 * use the following formula to estimate the overhead now:
1631 * dest->activeconns*256 + dest->inactconns
1632 */
1633 return (atomic_read(&dest->activeconns) << 8) +
1634 atomic_read(&dest->inactconns);
1635 }
1636
1637 #endif /* _NET_IP_VS_H */
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