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 #include <linux/workqueue.h>
18
19 #include <linux/compiler.h>
20 #include <linux/timer.h>
21 #include <linux/bug.h>
22
23 #include <net/checksum.h>
24 #include <linux/netfilter.h> /* for union nf_inet_addr */
25 #include <linux/ip.h>
26 #include <linux/ipv6.h> /* for struct ipv6hdr */
27 #include <net/ipv6.h>
28 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
29 #include <net/netfilter/nf_conntrack.h>
30 #endif
31 #include <net/net_namespace.h> /* Netw namespace */
32
33 #define IP_VS_HDR_INVERSE 1
34 #define IP_VS_HDR_ICMP 2
35
36 /* Generic access of ipvs struct */
net_ipvs(struct net * net)37 static inline struct netns_ipvs *net_ipvs(struct net* net)
38 {
39 return net->ipvs;
40 }
41
42 /* Connections' size value needed by ip_vs_ctl.c */
43 extern int ip_vs_conn_tab_size;
44
45 struct ip_vs_iphdr {
46 int hdr_flags; /* ipvs flags */
47 __u32 off; /* Where IP or IPv4 header starts */
48 __u32 len; /* IPv4 simply where L4 starts
49 * IPv6 where L4 Transport Header starts */
50 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
51 __s16 protocol;
52 __s32 flags;
53 union nf_inet_addr saddr;
54 union nf_inet_addr daddr;
55 };
56
frag_safe_skb_hp(const struct sk_buff * skb,int offset,int len,void * buffer)57 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
58 int len, void *buffer)
59 {
60 return skb_header_pointer(skb, offset, len, buffer);
61 }
62
63 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
64 * IPv6 requires some extra work, as finding proper header position,
65 * depend on the IPv6 extension headers.
66 */
67 static inline int
ip_vs_fill_iph_skb_off(int af,const struct sk_buff * skb,int offset,int hdr_flags,struct ip_vs_iphdr * iphdr)68 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
69 int hdr_flags, struct ip_vs_iphdr *iphdr)
70 {
71 iphdr->hdr_flags = hdr_flags;
72 iphdr->off = offset;
73
74 #ifdef CONFIG_IP_VS_IPV6
75 if (af == AF_INET6) {
76 struct ipv6hdr _iph;
77 const struct ipv6hdr *iph = skb_header_pointer(
78 skb, offset, sizeof(_iph), &_iph);
79 if (!iph)
80 return 0;
81
82 iphdr->saddr.in6 = iph->saddr;
83 iphdr->daddr.in6 = iph->daddr;
84 /* ipv6_find_hdr() updates len, flags */
85 iphdr->len = offset;
86 iphdr->flags = 0;
87 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
88 &iphdr->fragoffs,
89 &iphdr->flags);
90 if (iphdr->protocol < 0)
91 return 0;
92 } else
93 #endif
94 {
95 struct iphdr _iph;
96 const struct iphdr *iph = skb_header_pointer(
97 skb, offset, sizeof(_iph), &_iph);
98 if (!iph)
99 return 0;
100
101 iphdr->len = offset + iph->ihl * 4;
102 iphdr->fragoffs = 0;
103 iphdr->protocol = iph->protocol;
104 iphdr->saddr.ip = iph->saddr;
105 iphdr->daddr.ip = iph->daddr;
106 }
107
108 return 1;
109 }
110
111 static inline int
ip_vs_fill_iph_skb_icmp(int af,const struct sk_buff * skb,int offset,bool inverse,struct ip_vs_iphdr * iphdr)112 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
113 bool inverse, struct ip_vs_iphdr *iphdr)
114 {
115 int hdr_flags = IP_VS_HDR_ICMP;
116
117 if (inverse)
118 hdr_flags |= IP_VS_HDR_INVERSE;
119
120 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
121 }
122
123 static inline int
ip_vs_fill_iph_skb(int af,const struct sk_buff * skb,bool inverse,struct ip_vs_iphdr * iphdr)124 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
125 struct ip_vs_iphdr *iphdr)
126 {
127 int hdr_flags = 0;
128
129 if (inverse)
130 hdr_flags |= IP_VS_HDR_INVERSE;
131
132 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
133 hdr_flags, iphdr);
134 }
135
136 static inline bool
ip_vs_iph_inverse(const struct ip_vs_iphdr * iph)137 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
138 {
139 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
140 }
141
142 static inline bool
ip_vs_iph_icmp(const struct ip_vs_iphdr * iph)143 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
144 {
145 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
146 }
147
ip_vs_addr_copy(int af,union nf_inet_addr * dst,const union nf_inet_addr * src)148 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
149 const union nf_inet_addr *src)
150 {
151 #ifdef CONFIG_IP_VS_IPV6
152 if (af == AF_INET6)
153 dst->in6 = src->in6;
154 else
155 #endif
156 dst->ip = src->ip;
157 }
158
ip_vs_addr_set(int af,union nf_inet_addr * dst,const union nf_inet_addr * src)159 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
160 const union nf_inet_addr *src)
161 {
162 #ifdef CONFIG_IP_VS_IPV6
163 if (af == AF_INET6) {
164 dst->in6 = src->in6;
165 return;
166 }
167 #endif
168 dst->ip = src->ip;
169 dst->all[1] = 0;
170 dst->all[2] = 0;
171 dst->all[3] = 0;
172 }
173
ip_vs_addr_equal(int af,const union nf_inet_addr * a,const union nf_inet_addr * b)174 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
175 const union nf_inet_addr *b)
176 {
177 #ifdef CONFIG_IP_VS_IPV6
178 if (af == AF_INET6)
179 return ipv6_addr_equal(&a->in6, &b->in6);
180 #endif
181 return a->ip == b->ip;
182 }
183
184 #ifdef CONFIG_IP_VS_DEBUG
185 #include <linux/net.h>
186
187 int ip_vs_get_debug_level(void);
188
ip_vs_dbg_addr(int af,char * buf,size_t buf_len,const union nf_inet_addr * addr,int * idx)189 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
190 const union nf_inet_addr *addr,
191 int *idx)
192 {
193 int len;
194 #ifdef CONFIG_IP_VS_IPV6
195 if (af == AF_INET6)
196 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
197 &addr->in6) + 1;
198 else
199 #endif
200 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
201 &addr->ip) + 1;
202
203 *idx += len;
204 BUG_ON(*idx > buf_len + 1);
205 return &buf[*idx - len];
206 }
207
208 #define IP_VS_DBG_BUF(level, msg, ...) \
209 do { \
210 char ip_vs_dbg_buf[160]; \
211 int ip_vs_dbg_idx = 0; \
212 if (level <= ip_vs_get_debug_level()) \
213 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
214 } while (0)
215 #define IP_VS_ERR_BUF(msg...) \
216 do { \
217 char ip_vs_dbg_buf[160]; \
218 int ip_vs_dbg_idx = 0; \
219 pr_err(msg); \
220 } while (0)
221
222 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
223 #define IP_VS_DBG_ADDR(af, addr) \
224 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
225 sizeof(ip_vs_dbg_buf), addr, \
226 &ip_vs_dbg_idx)
227
228 #define IP_VS_DBG(level, msg, ...) \
229 do { \
230 if (level <= ip_vs_get_debug_level()) \
231 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
232 } while (0)
233 #define IP_VS_DBG_RL(msg, ...) \
234 do { \
235 if (net_ratelimit()) \
236 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
237 } while (0)
238 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
239 do { \
240 if (level <= ip_vs_get_debug_level()) \
241 pp->debug_packet(af, pp, skb, ofs, msg); \
242 } while (0)
243 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
244 do { \
245 if (level <= ip_vs_get_debug_level() && \
246 net_ratelimit()) \
247 pp->debug_packet(af, pp, skb, ofs, msg); \
248 } while (0)
249 #else /* NO DEBUGGING at ALL */
250 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
251 #define IP_VS_ERR_BUF(msg...) do {} while (0)
252 #define IP_VS_DBG(level, msg...) do {} while (0)
253 #define IP_VS_DBG_RL(msg...) do {} while (0)
254 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
255 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
256 #endif
257
258 #define IP_VS_BUG() BUG()
259 #define IP_VS_ERR_RL(msg, ...) \
260 do { \
261 if (net_ratelimit()) \
262 pr_err(msg, ##__VA_ARGS__); \
263 } while (0)
264
265 #ifdef CONFIG_IP_VS_DEBUG
266 #define EnterFunction(level) \
267 do { \
268 if (level <= ip_vs_get_debug_level()) \
269 printk(KERN_DEBUG \
270 pr_fmt("Enter: %s, %s line %i\n"), \
271 __func__, __FILE__, __LINE__); \
272 } while (0)
273 #define LeaveFunction(level) \
274 do { \
275 if (level <= ip_vs_get_debug_level()) \
276 printk(KERN_DEBUG \
277 pr_fmt("Leave: %s, %s line %i\n"), \
278 __func__, __FILE__, __LINE__); \
279 } while (0)
280 #else
281 #define EnterFunction(level) do {} while (0)
282 #define LeaveFunction(level) do {} while (0)
283 #endif
284
285 /* The port number of FTP service (in network order). */
286 #define FTPPORT cpu_to_be16(21)
287 #define FTPDATA cpu_to_be16(20)
288
289 /* TCP State Values */
290 enum {
291 IP_VS_TCP_S_NONE = 0,
292 IP_VS_TCP_S_ESTABLISHED,
293 IP_VS_TCP_S_SYN_SENT,
294 IP_VS_TCP_S_SYN_RECV,
295 IP_VS_TCP_S_FIN_WAIT,
296 IP_VS_TCP_S_TIME_WAIT,
297 IP_VS_TCP_S_CLOSE,
298 IP_VS_TCP_S_CLOSE_WAIT,
299 IP_VS_TCP_S_LAST_ACK,
300 IP_VS_TCP_S_LISTEN,
301 IP_VS_TCP_S_SYNACK,
302 IP_VS_TCP_S_LAST
303 };
304
305 /* UDP State Values */
306 enum {
307 IP_VS_UDP_S_NORMAL,
308 IP_VS_UDP_S_LAST,
309 };
310
311 /* ICMP State Values */
312 enum {
313 IP_VS_ICMP_S_NORMAL,
314 IP_VS_ICMP_S_LAST,
315 };
316
317 /* SCTP State Values */
318 enum ip_vs_sctp_states {
319 IP_VS_SCTP_S_NONE,
320 IP_VS_SCTP_S_INIT1,
321 IP_VS_SCTP_S_INIT,
322 IP_VS_SCTP_S_COOKIE_SENT,
323 IP_VS_SCTP_S_COOKIE_REPLIED,
324 IP_VS_SCTP_S_COOKIE_WAIT,
325 IP_VS_SCTP_S_COOKIE,
326 IP_VS_SCTP_S_COOKIE_ECHOED,
327 IP_VS_SCTP_S_ESTABLISHED,
328 IP_VS_SCTP_S_SHUTDOWN_SENT,
329 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
330 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
331 IP_VS_SCTP_S_REJECTED,
332 IP_VS_SCTP_S_CLOSED,
333 IP_VS_SCTP_S_LAST
334 };
335
336 /* Connection templates use bits from state */
337 #define IP_VS_CTPL_S_NONE 0x0000
338 #define IP_VS_CTPL_S_ASSURED 0x0001
339 #define IP_VS_CTPL_S_LAST 0x0002
340
341 /* Delta sequence info structure
342 * Each ip_vs_conn has 2 (output AND input seq. changes).
343 * Only used in the VS/NAT.
344 */
345 struct ip_vs_seq {
346 __u32 init_seq; /* Add delta from this seq */
347 __u32 delta; /* Delta in sequence numbers */
348 __u32 previous_delta; /* Delta in sequence numbers
349 * before last resized pkt */
350 };
351
352 /* counters per cpu */
353 struct ip_vs_counters {
354 __u64 conns; /* connections scheduled */
355 __u64 inpkts; /* incoming packets */
356 __u64 outpkts; /* outgoing packets */
357 __u64 inbytes; /* incoming bytes */
358 __u64 outbytes; /* outgoing bytes */
359 };
360 /* Stats per cpu */
361 struct ip_vs_cpu_stats {
362 struct ip_vs_counters cnt;
363 struct u64_stats_sync syncp;
364 };
365
366 /* IPVS statistics objects */
367 struct ip_vs_estimator {
368 struct list_head list;
369
370 u64 last_inbytes;
371 u64 last_outbytes;
372 u64 last_conns;
373 u64 last_inpkts;
374 u64 last_outpkts;
375
376 u64 cps;
377 u64 inpps;
378 u64 outpps;
379 u64 inbps;
380 u64 outbps;
381 };
382
383 /*
384 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
385 */
386 struct ip_vs_kstats {
387 u64 conns; /* connections scheduled */
388 u64 inpkts; /* incoming packets */
389 u64 outpkts; /* outgoing packets */
390 u64 inbytes; /* incoming bytes */
391 u64 outbytes; /* outgoing bytes */
392
393 u64 cps; /* current connection rate */
394 u64 inpps; /* current in packet rate */
395 u64 outpps; /* current out packet rate */
396 u64 inbps; /* current in byte rate */
397 u64 outbps; /* current out byte rate */
398 };
399
400 struct ip_vs_stats {
401 struct ip_vs_kstats kstats; /* kernel statistics */
402 struct ip_vs_estimator est; /* estimator */
403 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
404 spinlock_t lock; /* spin lock */
405 struct ip_vs_kstats kstats0; /* reset values */
406 };
407
408 struct dst_entry;
409 struct iphdr;
410 struct ip_vs_conn;
411 struct ip_vs_app;
412 struct sk_buff;
413 struct ip_vs_proto_data;
414
415 struct ip_vs_protocol {
416 struct ip_vs_protocol *next;
417 char *name;
418 u16 protocol;
419 u16 num_states;
420 int dont_defrag;
421
422 void (*init)(struct ip_vs_protocol *pp);
423
424 void (*exit)(struct ip_vs_protocol *pp);
425
426 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
427
428 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
429
430 int (*conn_schedule)(struct netns_ipvs *ipvs,
431 int af, struct sk_buff *skb,
432 struct ip_vs_proto_data *pd,
433 int *verdict, struct ip_vs_conn **cpp,
434 struct ip_vs_iphdr *iph);
435
436 struct ip_vs_conn *
437 (*conn_in_get)(struct netns_ipvs *ipvs,
438 int af,
439 const struct sk_buff *skb,
440 const struct ip_vs_iphdr *iph);
441
442 struct ip_vs_conn *
443 (*conn_out_get)(struct netns_ipvs *ipvs,
444 int af,
445 const struct sk_buff *skb,
446 const struct ip_vs_iphdr *iph);
447
448 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
449 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
450
451 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
452 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
453
454 const char *(*state_name)(int state);
455
456 void (*state_transition)(struct ip_vs_conn *cp, int direction,
457 const struct sk_buff *skb,
458 struct ip_vs_proto_data *pd);
459
460 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
461
462 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
463
464 int (*app_conn_bind)(struct ip_vs_conn *cp);
465
466 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
467 const struct sk_buff *skb,
468 int offset,
469 const char *msg);
470
471 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
472 };
473
474 /* protocol data per netns */
475 struct ip_vs_proto_data {
476 struct ip_vs_proto_data *next;
477 struct ip_vs_protocol *pp;
478 int *timeout_table; /* protocol timeout table */
479 atomic_t appcnt; /* counter of proto app incs. */
480 struct tcp_states_t *tcp_state_table;
481 };
482
483 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
484 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
485 unsigned short proto);
486
487 struct ip_vs_conn_param {
488 struct netns_ipvs *ipvs;
489 const union nf_inet_addr *caddr;
490 const union nf_inet_addr *vaddr;
491 __be16 cport;
492 __be16 vport;
493 __u16 protocol;
494 u16 af;
495
496 const struct ip_vs_pe *pe;
497 char *pe_data;
498 __u8 pe_data_len;
499 };
500
501 /* IP_VS structure allocated for each dynamically scheduled connection */
502 struct ip_vs_conn {
503 struct hlist_node c_list; /* hashed list heads */
504 /* Protocol, addresses and port numbers */
505 __be16 cport;
506 __be16 dport;
507 __be16 vport;
508 u16 af; /* address family */
509 union nf_inet_addr caddr; /* client address */
510 union nf_inet_addr vaddr; /* virtual address */
511 union nf_inet_addr daddr; /* destination address */
512 volatile __u32 flags; /* status flags */
513 __u16 protocol; /* Which protocol (TCP/UDP) */
514 __u16 daf; /* Address family of the dest */
515 struct netns_ipvs *ipvs;
516
517 /* counter and timer */
518 refcount_t refcnt; /* reference count */
519 struct timer_list timer; /* Expiration timer */
520 volatile unsigned long timeout; /* timeout */
521
522 /* Flags and state transition */
523 spinlock_t lock; /* lock for state transition */
524 volatile __u16 state; /* state info */
525 volatile __u16 old_state; /* old state, to be used for
526 * state transition triggerd
527 * synchronization
528 */
529 __u32 fwmark; /* Fire wall mark from skb */
530 unsigned long sync_endtime; /* jiffies + sent_retries */
531
532 /* Control members */
533 struct ip_vs_conn *control; /* Master control connection */
534 atomic_t n_control; /* Number of controlled ones */
535 struct ip_vs_dest *dest; /* real server */
536 atomic_t in_pkts; /* incoming packet counter */
537
538 /* Packet transmitter for different forwarding methods. If it
539 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
540 * otherwise this must be changed to a sk_buff **.
541 * NF_ACCEPT can be returned when destination is local.
542 */
543 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
544 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
545
546 /* Note: we can group the following members into a structure,
547 * in order to save more space, and the following members are
548 * only used in VS/NAT anyway
549 */
550 struct ip_vs_app *app; /* bound ip_vs_app object */
551 void *app_data; /* Application private data */
552 struct_group(sync_conn_opt,
553 struct ip_vs_seq in_seq; /* incoming seq. struct */
554 struct ip_vs_seq out_seq; /* outgoing seq. struct */
555 );
556
557 const struct ip_vs_pe *pe;
558 char *pe_data;
559 __u8 pe_data_len;
560
561 struct rcu_head rcu_head;
562 };
563
564 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
565 * for IPv6 support.
566 *
567 * We need these to conveniently pass around service and destination
568 * options, but unfortunately, we also need to keep the old definitions to
569 * maintain userspace backwards compatibility for the setsockopt interface.
570 */
571 struct ip_vs_service_user_kern {
572 /* virtual service addresses */
573 u16 af;
574 u16 protocol;
575 union nf_inet_addr addr; /* virtual ip address */
576 __be16 port;
577 u32 fwmark; /* firwall mark of service */
578
579 /* virtual service options */
580 char *sched_name;
581 char *pe_name;
582 unsigned int flags; /* virtual service flags */
583 unsigned int timeout; /* persistent timeout in sec */
584 __be32 netmask; /* persistent netmask or plen */
585 };
586
587
588 struct ip_vs_dest_user_kern {
589 /* destination server address */
590 union nf_inet_addr addr;
591 __be16 port;
592
593 /* real server options */
594 unsigned int conn_flags; /* connection flags */
595 int weight; /* destination weight */
596
597 /* thresholds for active connections */
598 u32 u_threshold; /* upper threshold */
599 u32 l_threshold; /* lower threshold */
600
601 /* Address family of addr */
602 u16 af;
603
604 u16 tun_type; /* tunnel type */
605 __be16 tun_port; /* tunnel port */
606 u16 tun_flags; /* tunnel flags */
607 };
608
609
610 /*
611 * The information about the virtual service offered to the net and the
612 * forwarding entries.
613 */
614 struct ip_vs_service {
615 struct hlist_node s_list; /* for normal service table */
616 struct hlist_node f_list; /* for fwmark-based service table */
617 atomic_t refcnt; /* reference counter */
618
619 u16 af; /* address family */
620 __u16 protocol; /* which protocol (TCP/UDP) */
621 union nf_inet_addr addr; /* IP address for virtual service */
622 __be16 port; /* port number for the service */
623 __u32 fwmark; /* firewall mark of the service */
624 unsigned int flags; /* service status flags */
625 unsigned int timeout; /* persistent timeout in ticks */
626 __be32 netmask; /* grouping granularity, mask/plen */
627 struct netns_ipvs *ipvs;
628
629 struct list_head destinations; /* real server d-linked list */
630 __u32 num_dests; /* number of servers */
631 struct ip_vs_stats stats; /* statistics for the service */
632
633 /* for scheduling */
634 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
635 spinlock_t sched_lock; /* lock sched_data */
636 void *sched_data; /* scheduler application data */
637
638 /* alternate persistence engine */
639 struct ip_vs_pe __rcu *pe;
640 int conntrack_afmask;
641
642 struct rcu_head rcu_head;
643 };
644
645 /* Information for cached dst */
646 struct ip_vs_dest_dst {
647 struct dst_entry *dst_cache; /* destination cache entry */
648 u32 dst_cookie;
649 union nf_inet_addr dst_saddr;
650 struct rcu_head rcu_head;
651 };
652
653 /* The real server destination forwarding entry with ip address, port number,
654 * and so on.
655 */
656 struct ip_vs_dest {
657 struct list_head n_list; /* for the dests in the service */
658 struct hlist_node d_list; /* for table with all the dests */
659
660 u16 af; /* address family */
661 __be16 port; /* port number of the server */
662 union nf_inet_addr addr; /* IP address of the server */
663 volatile unsigned int flags; /* dest status flags */
664 atomic_t conn_flags; /* flags to copy to conn */
665 atomic_t weight; /* server weight */
666 atomic_t last_weight; /* server latest weight */
667 __u16 tun_type; /* tunnel type */
668 __be16 tun_port; /* tunnel port */
669 __u16 tun_flags; /* tunnel flags */
670
671 refcount_t refcnt; /* reference counter */
672 struct ip_vs_stats stats; /* statistics */
673 unsigned long idle_start; /* start time, jiffies */
674
675 /* connection counters and thresholds */
676 atomic_t activeconns; /* active connections */
677 atomic_t inactconns; /* inactive connections */
678 atomic_t persistconns; /* persistent connections */
679 __u32 u_threshold; /* upper threshold */
680 __u32 l_threshold; /* lower threshold */
681
682 /* for destination cache */
683 spinlock_t dst_lock; /* lock of dst_cache */
684 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
685
686 /* for virtual service */
687 struct ip_vs_service __rcu *svc; /* service it belongs to */
688 __u16 protocol; /* which protocol (TCP/UDP) */
689 __be16 vport; /* virtual port number */
690 union nf_inet_addr vaddr; /* virtual IP address */
691 __u32 vfwmark; /* firewall mark of service */
692
693 struct list_head t_list; /* in dest_trash */
694 unsigned int in_rs_table:1; /* we are in rs_table */
695 };
696
697 /* The scheduler object */
698 struct ip_vs_scheduler {
699 struct list_head n_list; /* d-linked list head */
700 char *name; /* scheduler name */
701 atomic_t refcnt; /* reference counter */
702 struct module *module; /* THIS_MODULE/NULL */
703
704 /* scheduler initializing service */
705 int (*init_service)(struct ip_vs_service *svc);
706 /* scheduling service finish */
707 void (*done_service)(struct ip_vs_service *svc);
708 /* dest is linked */
709 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 /* dest is unlinked */
711 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
712 /* dest is updated */
713 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
714
715 /* selecting a server from the given service */
716 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
717 const struct sk_buff *skb,
718 struct ip_vs_iphdr *iph);
719 };
720
721 /* The persistence engine object */
722 struct ip_vs_pe {
723 struct list_head n_list; /* d-linked list head */
724 char *name; /* scheduler name */
725 atomic_t refcnt; /* reference counter */
726 struct module *module; /* THIS_MODULE/NULL */
727
728 /* get the connection template, if any */
729 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
730 bool (*ct_match)(const struct ip_vs_conn_param *p,
731 struct ip_vs_conn *ct);
732 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
733 bool inverse);
734 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
735 /* create connections for real-server outgoing packets */
736 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
737 struct ip_vs_dest *dest,
738 struct sk_buff *skb,
739 const struct ip_vs_iphdr *iph,
740 __be16 dport, __be16 cport);
741 };
742
743 /* The application module object (a.k.a. app incarnation) */
744 struct ip_vs_app {
745 struct list_head a_list; /* member in app list */
746 int type; /* IP_VS_APP_TYPE_xxx */
747 char *name; /* application module name */
748 __u16 protocol;
749 struct module *module; /* THIS_MODULE/NULL */
750 struct list_head incs_list; /* list of incarnations */
751
752 /* members for application incarnations */
753 struct list_head p_list; /* member in proto app list */
754 struct ip_vs_app *app; /* its real application */
755 __be16 port; /* port number in net order */
756 atomic_t usecnt; /* usage counter */
757 struct rcu_head rcu_head;
758
759 /* output hook: Process packet in inout direction, diff set for TCP.
760 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
761 * 2=Mangled but checksum was not updated
762 */
763 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
764 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
765
766 /* input hook: Process packet in outin direction, diff set for TCP.
767 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
768 * 2=Mangled but checksum was not updated
769 */
770 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
771 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
772
773 /* ip_vs_app initializer */
774 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
775
776 /* ip_vs_app finish */
777 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
778
779
780 /* not used now */
781 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
782 struct ip_vs_protocol *);
783
784 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
785
786 int * timeout_table;
787 int * timeouts;
788 int timeouts_size;
789
790 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
791 int *verdict, struct ip_vs_conn **cpp);
792
793 struct ip_vs_conn *
794 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
795 const struct iphdr *iph, int inverse);
796
797 struct ip_vs_conn *
798 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
799 const struct iphdr *iph, int inverse);
800
801 int (*state_transition)(struct ip_vs_conn *cp, int direction,
802 const struct sk_buff *skb,
803 struct ip_vs_app *app);
804
805 void (*timeout_change)(struct ip_vs_app *app, int flags);
806 };
807
808 struct ipvs_master_sync_state {
809 struct list_head sync_queue;
810 struct ip_vs_sync_buff *sync_buff;
811 unsigned long sync_queue_len;
812 unsigned int sync_queue_delay;
813 struct delayed_work master_wakeup_work;
814 struct netns_ipvs *ipvs;
815 };
816
817 struct ip_vs_sync_thread_data;
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 int num_services6; /* IPv6 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 /* delayed work for expiring no dest connections */
890 struct delayed_work expire_nodest_conn_work;
891 /* 1/rate drop and drop-entry variables */
892 struct delayed_work defense_work; /* Work handler */
893 int drop_rate;
894 int drop_counter;
895 int old_secure_tcp;
896 atomic_t dropentry;
897 /* locks in ctl.c */
898 spinlock_t dropentry_lock; /* drop entry handling */
899 spinlock_t droppacket_lock; /* drop packet handling */
900 spinlock_t securetcp_lock; /* state and timeout tables */
901
902 /* sys-ctl struct */
903 struct ctl_table_header *sysctl_hdr;
904 struct ctl_table *sysctl_tbl;
905 #endif
906
907 /* sysctl variables */
908 int sysctl_amemthresh;
909 int sysctl_am_droprate;
910 int sysctl_drop_entry;
911 int sysctl_drop_packet;
912 int sysctl_secure_tcp;
913 #ifdef CONFIG_IP_VS_NFCT
914 int sysctl_conntrack;
915 #endif
916 int sysctl_snat_reroute;
917 int sysctl_sync_ver;
918 int sysctl_sync_ports;
919 int sysctl_sync_persist_mode;
920 unsigned long sysctl_sync_qlen_max;
921 int sysctl_sync_sock_size;
922 int sysctl_cache_bypass;
923 int sysctl_expire_nodest_conn;
924 int sysctl_sloppy_tcp;
925 int sysctl_sloppy_sctp;
926 int sysctl_expire_quiescent_template;
927 int sysctl_sync_threshold[2];
928 unsigned int sysctl_sync_refresh_period;
929 int sysctl_sync_retries;
930 int sysctl_nat_icmp_send;
931 int sysctl_pmtu_disc;
932 int sysctl_backup_only;
933 int sysctl_conn_reuse_mode;
934 int sysctl_schedule_icmp;
935 int sysctl_ignore_tunneled;
936
937 /* ip_vs_lblc */
938 int sysctl_lblc_expiration;
939 struct ctl_table_header *lblc_ctl_header;
940 struct ctl_table *lblc_ctl_table;
941 /* ip_vs_lblcr */
942 int sysctl_lblcr_expiration;
943 struct ctl_table_header *lblcr_ctl_header;
944 struct ctl_table *lblcr_ctl_table;
945 /* ip_vs_est */
946 struct list_head est_list; /* estimator list */
947 spinlock_t est_lock;
948 struct timer_list est_timer; /* Estimation timer */
949 /* ip_vs_sync */
950 spinlock_t sync_lock;
951 struct ipvs_master_sync_state *ms;
952 spinlock_t sync_buff_lock;
953 struct ip_vs_sync_thread_data *master_tinfo;
954 struct ip_vs_sync_thread_data *backup_tinfo;
955 int threads_mask;
956 volatile int sync_state;
957 struct mutex sync_mutex;
958 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
959 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
960 /* net name space ptr */
961 struct net *net; /* Needed by timer routines */
962 /* Number of heterogeneous destinations, needed becaus heterogeneous
963 * are not supported when synchronization is enabled.
964 */
965 unsigned int mixed_address_family_dests;
966 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
967 };
968
969 #define DEFAULT_SYNC_THRESHOLD 3
970 #define DEFAULT_SYNC_PERIOD 50
971 #define DEFAULT_SYNC_VER 1
972 #define DEFAULT_SLOPPY_TCP 0
973 #define DEFAULT_SLOPPY_SCTP 0
974 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
975 #define DEFAULT_SYNC_RETRIES 0
976 #define IPVS_SYNC_WAKEUP_RATE 8
977 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
978 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
979 #define IPVS_SYNC_CHECK_PERIOD HZ
980 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
981 #define IPVS_SYNC_PORTS_MAX (1 << 6)
982
983 #ifdef CONFIG_SYSCTL
984
sysctl_sync_threshold(struct netns_ipvs * ipvs)985 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
986 {
987 return ipvs->sysctl_sync_threshold[0];
988 }
989
sysctl_sync_period(struct netns_ipvs * ipvs)990 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
991 {
992 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
993 }
994
sysctl_sync_refresh_period(struct netns_ipvs * ipvs)995 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
996 {
997 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
998 }
999
sysctl_sync_retries(struct netns_ipvs * ipvs)1000 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1001 {
1002 return ipvs->sysctl_sync_retries;
1003 }
1004
sysctl_sync_ver(struct netns_ipvs * ipvs)1005 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1006 {
1007 return ipvs->sysctl_sync_ver;
1008 }
1009
sysctl_sloppy_tcp(struct netns_ipvs * ipvs)1010 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1011 {
1012 return ipvs->sysctl_sloppy_tcp;
1013 }
1014
sysctl_sloppy_sctp(struct netns_ipvs * ipvs)1015 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1016 {
1017 return ipvs->sysctl_sloppy_sctp;
1018 }
1019
sysctl_sync_ports(struct netns_ipvs * ipvs)1020 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1021 {
1022 return READ_ONCE(ipvs->sysctl_sync_ports);
1023 }
1024
sysctl_sync_persist_mode(struct netns_ipvs * ipvs)1025 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1026 {
1027 return ipvs->sysctl_sync_persist_mode;
1028 }
1029
sysctl_sync_qlen_max(struct netns_ipvs * ipvs)1030 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1031 {
1032 return ipvs->sysctl_sync_qlen_max;
1033 }
1034
sysctl_sync_sock_size(struct netns_ipvs * ipvs)1035 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1036 {
1037 return ipvs->sysctl_sync_sock_size;
1038 }
1039
sysctl_pmtu_disc(struct netns_ipvs * ipvs)1040 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1041 {
1042 return ipvs->sysctl_pmtu_disc;
1043 }
1044
sysctl_backup_only(struct netns_ipvs * ipvs)1045 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1046 {
1047 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1048 ipvs->sysctl_backup_only;
1049 }
1050
sysctl_conn_reuse_mode(struct netns_ipvs * ipvs)1051 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1052 {
1053 return ipvs->sysctl_conn_reuse_mode;
1054 }
1055
sysctl_expire_nodest_conn(struct netns_ipvs * ipvs)1056 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1057 {
1058 return ipvs->sysctl_expire_nodest_conn;
1059 }
1060
sysctl_schedule_icmp(struct netns_ipvs * ipvs)1061 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1062 {
1063 return ipvs->sysctl_schedule_icmp;
1064 }
1065
sysctl_ignore_tunneled(struct netns_ipvs * ipvs)1066 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1067 {
1068 return ipvs->sysctl_ignore_tunneled;
1069 }
1070
sysctl_cache_bypass(struct netns_ipvs * ipvs)1071 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1072 {
1073 return ipvs->sysctl_cache_bypass;
1074 }
1075
1076 #else
1077
sysctl_sync_threshold(struct netns_ipvs * ipvs)1078 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1079 {
1080 return DEFAULT_SYNC_THRESHOLD;
1081 }
1082
sysctl_sync_period(struct netns_ipvs * ipvs)1083 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1084 {
1085 return DEFAULT_SYNC_PERIOD;
1086 }
1087
sysctl_sync_refresh_period(struct netns_ipvs * ipvs)1088 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1089 {
1090 return DEFAULT_SYNC_REFRESH_PERIOD;
1091 }
1092
sysctl_sync_retries(struct netns_ipvs * ipvs)1093 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1094 {
1095 return DEFAULT_SYNC_RETRIES & 3;
1096 }
1097
sysctl_sync_ver(struct netns_ipvs * ipvs)1098 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1099 {
1100 return DEFAULT_SYNC_VER;
1101 }
1102
sysctl_sloppy_tcp(struct netns_ipvs * ipvs)1103 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1104 {
1105 return DEFAULT_SLOPPY_TCP;
1106 }
1107
sysctl_sloppy_sctp(struct netns_ipvs * ipvs)1108 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1109 {
1110 return DEFAULT_SLOPPY_SCTP;
1111 }
1112
sysctl_sync_ports(struct netns_ipvs * ipvs)1113 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1114 {
1115 return 1;
1116 }
1117
sysctl_sync_persist_mode(struct netns_ipvs * ipvs)1118 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1119 {
1120 return 0;
1121 }
1122
sysctl_sync_qlen_max(struct netns_ipvs * ipvs)1123 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1124 {
1125 return IPVS_SYNC_QLEN_MAX;
1126 }
1127
sysctl_sync_sock_size(struct netns_ipvs * ipvs)1128 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1129 {
1130 return 0;
1131 }
1132
sysctl_pmtu_disc(struct netns_ipvs * ipvs)1133 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1134 {
1135 return 1;
1136 }
1137
sysctl_backup_only(struct netns_ipvs * ipvs)1138 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1139 {
1140 return 0;
1141 }
1142
sysctl_conn_reuse_mode(struct netns_ipvs * ipvs)1143 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1144 {
1145 return 1;
1146 }
1147
sysctl_expire_nodest_conn(struct netns_ipvs * ipvs)1148 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1149 {
1150 return 0;
1151 }
1152
sysctl_schedule_icmp(struct netns_ipvs * ipvs)1153 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1154 {
1155 return 0;
1156 }
1157
sysctl_ignore_tunneled(struct netns_ipvs * ipvs)1158 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1159 {
1160 return 0;
1161 }
1162
sysctl_cache_bypass(struct netns_ipvs * ipvs)1163 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1164 {
1165 return 0;
1166 }
1167
1168 #endif
1169
1170 /* IPVS core functions
1171 * (from ip_vs_core.c)
1172 */
1173 const char *ip_vs_proto_name(unsigned int proto);
1174 void ip_vs_init_hash_table(struct list_head *table, int rows);
1175 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1176 struct ip_vs_dest *dest,
1177 struct sk_buff *skb,
1178 const struct ip_vs_iphdr *iph,
1179 __be16 dport,
1180 __be16 cport);
1181 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1182
1183 #define IP_VS_APP_TYPE_FTP 1
1184
1185 /* ip_vs_conn handling functions
1186 * (from ip_vs_conn.c)
1187 */
1188 enum {
1189 IP_VS_DIR_INPUT = 0,
1190 IP_VS_DIR_OUTPUT,
1191 IP_VS_DIR_INPUT_ONLY,
1192 IP_VS_DIR_LAST,
1193 };
1194
ip_vs_conn_fill_param(struct netns_ipvs * ipvs,int af,int protocol,const union nf_inet_addr * caddr,__be16 cport,const union nf_inet_addr * vaddr,__be16 vport,struct ip_vs_conn_param * p)1195 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1196 const union nf_inet_addr *caddr,
1197 __be16 cport,
1198 const union nf_inet_addr *vaddr,
1199 __be16 vport,
1200 struct ip_vs_conn_param *p)
1201 {
1202 p->ipvs = ipvs;
1203 p->af = af;
1204 p->protocol = protocol;
1205 p->caddr = caddr;
1206 p->cport = cport;
1207 p->vaddr = vaddr;
1208 p->vport = vport;
1209 p->pe = NULL;
1210 p->pe_data = NULL;
1211 }
1212
1213 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1214 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1215
1216 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1217 const struct sk_buff *skb,
1218 const struct ip_vs_iphdr *iph);
1219
1220 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1221
1222 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1223 const struct sk_buff *skb,
1224 const struct ip_vs_iphdr *iph);
1225
1226 /* Get reference to gain full access to conn.
1227 * By default, RCU read-side critical sections have access only to
1228 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1229 */
__ip_vs_conn_get(struct ip_vs_conn * cp)1230 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1231 {
1232 return refcount_inc_not_zero(&cp->refcnt);
1233 }
1234
1235 /* put back the conn without restarting its timer */
__ip_vs_conn_put(struct ip_vs_conn * cp)1236 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1237 {
1238 smp_mb__before_atomic();
1239 refcount_dec(&cp->refcnt);
1240 }
1241 void ip_vs_conn_put(struct ip_vs_conn *cp);
1242 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1243
1244 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1245 const union nf_inet_addr *daddr,
1246 __be16 dport, unsigned int flags,
1247 struct ip_vs_dest *dest, __u32 fwmark);
1248 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1249
1250 const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1251
1252 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1253 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1254 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1255 int ip_vs_conn_init(void);
1256 void ip_vs_conn_cleanup(void);
1257
ip_vs_control_del(struct ip_vs_conn * cp)1258 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1259 {
1260 struct ip_vs_conn *ctl_cp = cp->control;
1261 if (!ctl_cp) {
1262 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1263 "%s:%d to %s:%d\n",
1264 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1265 ntohs(cp->cport),
1266 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1267 ntohs(cp->vport));
1268
1269 return;
1270 }
1271
1272 IP_VS_DBG_BUF(7, "DELeting control for: "
1273 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1274 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1275 ntohs(cp->cport),
1276 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1277 ntohs(ctl_cp->cport));
1278
1279 cp->control = NULL;
1280 if (atomic_read(&ctl_cp->n_control) == 0) {
1281 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
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 return;
1289 }
1290 atomic_dec(&ctl_cp->n_control);
1291 }
1292
1293 static inline void
ip_vs_control_add(struct ip_vs_conn * cp,struct ip_vs_conn * ctl_cp)1294 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1295 {
1296 if (cp->control) {
1297 IP_VS_ERR_BUF("request control ADD for already controlled: "
1298 "%s:%d to %s:%d\n",
1299 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1300 ntohs(cp->cport),
1301 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1302 ntohs(cp->vport));
1303
1304 ip_vs_control_del(cp);
1305 }
1306
1307 IP_VS_DBG_BUF(7, "ADDing control for: "
1308 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1309 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1310 ntohs(cp->cport),
1311 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1312 ntohs(ctl_cp->cport));
1313
1314 cp->control = ctl_cp;
1315 atomic_inc(&ctl_cp->n_control);
1316 }
1317
1318 /* Mark our template as assured */
1319 static inline void
ip_vs_control_assure_ct(struct ip_vs_conn * cp)1320 ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1321 {
1322 struct ip_vs_conn *ct = cp->control;
1323
1324 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1325 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1326 ct->state |= IP_VS_CTPL_S_ASSURED;
1327 }
1328
1329 /* IPVS netns init & cleanup functions */
1330 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1331 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1332 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1333 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1334 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1335 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1336 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1337 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1338 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1339 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1340 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1341 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1342 void ip_vs_service_nets_cleanup(struct list_head *net_list);
1343
1344 /* IPVS application functions
1345 * (from ip_vs_app.c)
1346 */
1347 #define IP_VS_APP_MAX_PORTS 8
1348 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1349 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1350 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1351 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1352 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1353 __u16 port);
1354 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1355 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1356
1357 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1358 struct ip_vs_iphdr *ipvsh);
1359 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1360 struct ip_vs_iphdr *ipvsh);
1361
1362 int register_ip_vs_pe(struct ip_vs_pe *pe);
1363 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1364 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1365 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1366
1367 /* Use a #define to avoid all of module.h just for these trivial ops */
1368 #define ip_vs_pe_get(pe) \
1369 if (pe && pe->module) \
1370 __module_get(pe->module);
1371
1372 #define ip_vs_pe_put(pe) \
1373 if (pe && pe->module) \
1374 module_put(pe->module);
1375
1376 /* IPVS protocol functions (from ip_vs_proto.c) */
1377 int ip_vs_protocol_init(void);
1378 void ip_vs_protocol_cleanup(void);
1379 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1380 int *ip_vs_create_timeout_table(int *table, int size);
1381 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1382 const struct sk_buff *skb, int offset,
1383 const char *msg);
1384
1385 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1386 extern struct ip_vs_protocol ip_vs_protocol_udp;
1387 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1388 extern struct ip_vs_protocol ip_vs_protocol_esp;
1389 extern struct ip_vs_protocol ip_vs_protocol_ah;
1390 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1391
1392 /* Registering/unregistering scheduler functions
1393 * (from ip_vs_sched.c)
1394 */
1395 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1396 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1397 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1398 struct ip_vs_scheduler *scheduler);
1399 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1400 struct ip_vs_scheduler *sched);
1401 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1402 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1403 struct ip_vs_conn *
1404 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1405 struct ip_vs_proto_data *pd, int *ignored,
1406 struct ip_vs_iphdr *iph);
1407 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1408 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1409
1410 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1411
1412 /* IPVS control data and functions (from ip_vs_ctl.c) */
1413 extern struct ip_vs_stats ip_vs_stats;
1414 extern int sysctl_ip_vs_sync_ver;
1415
1416 struct ip_vs_service *
1417 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1418 const union nf_inet_addr *vaddr, __be16 vport);
1419
1420 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1421 const union nf_inet_addr *daddr, __be16 dport);
1422
1423 struct ip_vs_dest *
1424 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1425 const union nf_inet_addr *daddr, __be16 dport);
1426 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1427 const union nf_inet_addr *daddr,
1428 __be16 tun_port);
1429
1430 int ip_vs_use_count_inc(void);
1431 void ip_vs_use_count_dec(void);
1432 int ip_vs_register_nl_ioctl(void);
1433 void ip_vs_unregister_nl_ioctl(void);
1434 int ip_vs_control_init(void);
1435 void ip_vs_control_cleanup(void);
1436 struct ip_vs_dest *
1437 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1438 const union nf_inet_addr *daddr, __be16 dport,
1439 const union nf_inet_addr *vaddr, __be16 vport,
1440 __u16 protocol, __u32 fwmark, __u32 flags);
1441 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1442
ip_vs_dest_hold(struct ip_vs_dest * dest)1443 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1444 {
1445 refcount_inc(&dest->refcnt);
1446 }
1447
ip_vs_dest_put(struct ip_vs_dest * dest)1448 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1449 {
1450 smp_mb__before_atomic();
1451 refcount_dec(&dest->refcnt);
1452 }
1453
ip_vs_dest_put_and_free(struct ip_vs_dest * dest)1454 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1455 {
1456 if (refcount_dec_and_test(&dest->refcnt))
1457 kfree(dest);
1458 }
1459
1460 /* IPVS sync daemon data and function prototypes
1461 * (from ip_vs_sync.c)
1462 */
1463 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1464 int state);
1465 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1466 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1467
1468 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1469 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1470 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1471 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1472 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1473
1474 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1475 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1476 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1477 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1478 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1480 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1482 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1484 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1485 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1486 struct ip_vs_protocol *pp, int offset,
1487 unsigned int hooknum, struct ip_vs_iphdr *iph);
1488 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1489
1490 #ifdef CONFIG_IP_VS_IPV6
1491 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1492 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1493 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1494 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1495 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1496 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1497 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1498 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1499 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1500 struct ip_vs_protocol *pp, int offset,
1501 unsigned int hooknum, struct ip_vs_iphdr *iph);
1502 #endif
1503
1504 #ifdef CONFIG_SYSCTL
1505 /* This is a simple mechanism to ignore packets when
1506 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1507 * we start to drop 1/rate of the packets
1508 */
ip_vs_todrop(struct netns_ipvs * ipvs)1509 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1510 {
1511 if (!ipvs->drop_rate)
1512 return 0;
1513 if (--ipvs->drop_counter > 0)
1514 return 0;
1515 ipvs->drop_counter = ipvs->drop_rate;
1516 return 1;
1517 }
1518 #else
ip_vs_todrop(struct netns_ipvs * ipvs)1519 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1520 #endif
1521
1522 #ifdef CONFIG_SYSCTL
1523 /* Enqueue delayed work for expiring no dest connections
1524 * Only run when sysctl_expire_nodest=1
1525 */
ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs * ipvs)1526 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1527 {
1528 if (sysctl_expire_nodest_conn(ipvs))
1529 queue_delayed_work(system_long_wq,
1530 &ipvs->expire_nodest_conn_work, 1);
1531 }
1532
1533 void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1534 #else
ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs * ipvs)1535 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1536 #endif
1537
1538 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1539 IP_VS_CONN_F_FWD_MASK)
1540
1541 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1542 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
1543
ip_vs_fwd_tag(struct ip_vs_conn * cp)1544 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1545 {
1546 char fwd;
1547
1548 switch (IP_VS_FWD_METHOD(cp)) {
1549 case IP_VS_CONN_F_MASQ:
1550 fwd = 'M'; break;
1551 case IP_VS_CONN_F_LOCALNODE:
1552 fwd = 'L'; break;
1553 case IP_VS_CONN_F_TUNNEL:
1554 fwd = 'T'; break;
1555 case IP_VS_CONN_F_DROUTE:
1556 fwd = 'R'; break;
1557 case IP_VS_CONN_F_BYPASS:
1558 fwd = 'B'; break;
1559 default:
1560 fwd = '?'; break;
1561 }
1562 return fwd;
1563 }
1564
1565 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1566 struct ip_vs_conn *cp, int dir);
1567
1568 #ifdef CONFIG_IP_VS_IPV6
1569 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1570 struct ip_vs_conn *cp, int dir);
1571 #endif
1572
1573 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1574
ip_vs_check_diff4(__be32 old,__be32 new,__wsum oldsum)1575 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1576 {
1577 __be32 diff[2] = { ~old, new };
1578
1579 return csum_partial(diff, sizeof(diff), oldsum);
1580 }
1581
1582 #ifdef CONFIG_IP_VS_IPV6
ip_vs_check_diff16(const __be32 * old,const __be32 * new,__wsum oldsum)1583 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1584 __wsum oldsum)
1585 {
1586 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1587 new[3], new[2], new[1], new[0] };
1588
1589 return csum_partial(diff, sizeof(diff), oldsum);
1590 }
1591 #endif
1592
ip_vs_check_diff2(__be16 old,__be16 new,__wsum oldsum)1593 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1594 {
1595 __be16 diff[2] = { ~old, new };
1596
1597 return csum_partial(diff, sizeof(diff), oldsum);
1598 }
1599
1600 /* Forget current conntrack (unconfirmed) and attach notrack entry */
ip_vs_notrack(struct sk_buff * skb)1601 static inline void ip_vs_notrack(struct sk_buff *skb)
1602 {
1603 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1604 enum ip_conntrack_info ctinfo;
1605 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1606
1607 if (ct) {
1608 nf_conntrack_put(&ct->ct_general);
1609 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1610 }
1611 #endif
1612 }
1613
1614 #ifdef CONFIG_IP_VS_NFCT
1615 /* Netfilter connection tracking
1616 * (from ip_vs_nfct.c)
1617 */
ip_vs_conntrack_enabled(struct netns_ipvs * ipvs)1618 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1619 {
1620 #ifdef CONFIG_SYSCTL
1621 return ipvs->sysctl_conntrack;
1622 #else
1623 return 0;
1624 #endif
1625 }
1626
1627 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1628 int outin);
1629 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1630 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1631 struct ip_vs_conn *cp, u_int8_t proto,
1632 const __be16 port, int from_rs);
1633 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1634
1635 #else
1636
ip_vs_conntrack_enabled(struct netns_ipvs * ipvs)1637 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1638 {
1639 return 0;
1640 }
1641
ip_vs_update_conntrack(struct sk_buff * skb,struct ip_vs_conn * cp,int outin)1642 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1643 struct ip_vs_conn *cp, int outin)
1644 {
1645 }
1646
ip_vs_confirm_conntrack(struct sk_buff * skb)1647 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1648 {
1649 return NF_ACCEPT;
1650 }
1651
ip_vs_conn_drop_conntrack(struct ip_vs_conn * cp)1652 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1653 {
1654 }
1655 #endif /* CONFIG_IP_VS_NFCT */
1656
1657 /* Using old conntrack that can not be redirected to another real server? */
ip_vs_conn_uses_old_conntrack(struct ip_vs_conn * cp,struct sk_buff * skb)1658 static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1659 struct sk_buff *skb)
1660 {
1661 #ifdef CONFIG_IP_VS_NFCT
1662 enum ip_conntrack_info ctinfo;
1663 struct nf_conn *ct;
1664
1665 ct = nf_ct_get(skb, &ctinfo);
1666 if (ct && nf_ct_is_confirmed(ct))
1667 return true;
1668 #endif
1669 return false;
1670 }
1671
ip_vs_register_conntrack(struct ip_vs_service * svc)1672 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1673 {
1674 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1675 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1676 int ret = 0;
1677
1678 if (!(svc->conntrack_afmask & afmask)) {
1679 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1680 if (ret >= 0)
1681 svc->conntrack_afmask |= afmask;
1682 }
1683 return ret;
1684 #else
1685 return 0;
1686 #endif
1687 }
1688
ip_vs_unregister_conntrack(struct ip_vs_service * svc)1689 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1690 {
1691 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1692 int afmask = (svc->af == AF_INET6) ? 2 : 1;
1693
1694 if (svc->conntrack_afmask & afmask) {
1695 nf_ct_netns_put(svc->ipvs->net, svc->af);
1696 svc->conntrack_afmask &= ~afmask;
1697 }
1698 #endif
1699 }
1700
1701 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1702 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1703
1704 static inline int
ip_vs_dest_conn_overhead(struct ip_vs_dest * dest)1705 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1706 {
1707 /* We think the overhead of processing active connections is 256
1708 * times higher than that of inactive connections in average. (This
1709 * 256 times might not be accurate, we will change it later) We
1710 * use the following formula to estimate the overhead now:
1711 * dest->activeconns*256 + dest->inactconns
1712 */
1713 return (atomic_read(&dest->activeconns) << 8) +
1714 atomic_read(&dest->inactconns);
1715 }
1716
1717 #ifdef CONFIG_IP_VS_PROTO_TCP
1718 INDIRECT_CALLABLE_DECLARE(int
1719 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1720 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1721 #endif
1722
1723 #ifdef CONFIG_IP_VS_PROTO_UDP
1724 INDIRECT_CALLABLE_DECLARE(int
1725 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1726 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1727 #endif
1728 #endif /* _NET_IP_VS_H */
1729