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