1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* IP Virtual Server
3  * data structure and functionality definitions
4  */
5 
6 #ifndef _NET_IP_VS_H
7 #define _NET_IP_VS_H
8 
9 #include <linux/ip_vs.h>                /* definitions shared with userland */
10 
11 #include <asm/types.h>                  /* for __uXX types */
12 
13 #include <linux/list.h>                 /* for struct list_head */
14 #include <linux/spinlock.h>             /* for struct rwlock_t */
15 #include <linux/atomic.h>               /* for struct atomic_t */
16 #include <linux/refcount.h>             /* for struct refcount_t */
17 
18 #include <linux/compiler.h>
19 #include <linux/timer.h>
20 #include <linux/bug.h>
21 
22 #include <net/checksum.h>
23 #include <linux/netfilter.h>		/* for union nf_inet_addr */
24 #include <linux/ip.h>
25 #include <linux/ipv6.h>			/* for struct ipv6hdr */
26 #include <net/ipv6.h>
27 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
28 #include <linux/netfilter_ipv6/ip6_tables.h>
29 #endif
30 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
31 #include <net/netfilter/nf_conntrack.h>
32 #endif
33 #include <net/net_namespace.h>		/* Netw namespace */
34 
35 #define IP_VS_HDR_INVERSE	1
36 #define IP_VS_HDR_ICMP		2
37 
38 /* Generic access of ipvs struct */
net_ipvs(struct net * net)39 static inline struct netns_ipvs *net_ipvs(struct net* net)
40 {
41 	return net->ipvs;
42 }
43 
44 /* Connections' size value needed by ip_vs_ctl.c */
45 extern int ip_vs_conn_tab_size;
46 
47 struct ip_vs_iphdr {
48 	int hdr_flags;	/* ipvs flags */
49 	__u32 off;	/* Where IP or IPv4 header starts */
50 	__u32 len;	/* IPv4 simply where L4 starts
51 			 * IPv6 where L4 Transport Header starts */
52 	__u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
53 	__s16 protocol;
54 	__s32 flags;
55 	union nf_inet_addr saddr;
56 	union nf_inet_addr daddr;
57 };
58 
frag_safe_skb_hp(const struct sk_buff * skb,int offset,int len,void * buffer)59 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
60 				      int len, void *buffer)
61 {
62 	return skb_header_pointer(skb, offset, len, buffer);
63 }
64 
65 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
66  * IPv6 requires some extra work, as finding proper header position,
67  * depend on the IPv6 extension headers.
68  */
69 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)70 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
71 		       int hdr_flags, struct ip_vs_iphdr *iphdr)
72 {
73 	iphdr->hdr_flags = hdr_flags;
74 	iphdr->off = offset;
75 
76 #ifdef CONFIG_IP_VS_IPV6
77 	if (af == AF_INET6) {
78 		struct ipv6hdr _iph;
79 		const struct ipv6hdr *iph = skb_header_pointer(
80 			skb, offset, sizeof(_iph), &_iph);
81 		if (!iph)
82 			return 0;
83 
84 		iphdr->saddr.in6 = iph->saddr;
85 		iphdr->daddr.in6 = iph->daddr;
86 		/* ipv6_find_hdr() updates len, flags */
87 		iphdr->len	 = offset;
88 		iphdr->flags	 = 0;
89 		iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
90 						 &iphdr->fragoffs,
91 						 &iphdr->flags);
92 		if (iphdr->protocol < 0)
93 			return 0;
94 	} else
95 #endif
96 	{
97 		struct iphdr _iph;
98 		const struct iphdr *iph = skb_header_pointer(
99 			skb, offset, sizeof(_iph), &_iph);
100 		if (!iph)
101 			return 0;
102 
103 		iphdr->len	= offset + iph->ihl * 4;
104 		iphdr->fragoffs	= 0;
105 		iphdr->protocol	= iph->protocol;
106 		iphdr->saddr.ip	= iph->saddr;
107 		iphdr->daddr.ip	= iph->daddr;
108 	}
109 
110 	return 1;
111 }
112 
113 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)114 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
115 			bool inverse, struct ip_vs_iphdr *iphdr)
116 {
117 	int hdr_flags = IP_VS_HDR_ICMP;
118 
119 	if (inverse)
120 		hdr_flags |= IP_VS_HDR_INVERSE;
121 
122 	return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
123 }
124 
125 static inline int
ip_vs_fill_iph_skb(int af,const struct sk_buff * skb,bool inverse,struct ip_vs_iphdr * iphdr)126 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
127 		   struct ip_vs_iphdr *iphdr)
128 {
129 	int hdr_flags = 0;
130 
131 	if (inverse)
132 		hdr_flags |= IP_VS_HDR_INVERSE;
133 
134 	return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
135 				      hdr_flags, iphdr);
136 }
137 
138 static inline bool
ip_vs_iph_inverse(const struct ip_vs_iphdr * iph)139 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
140 {
141 	return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
142 }
143 
144 static inline bool
ip_vs_iph_icmp(const struct ip_vs_iphdr * iph)145 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
146 {
147 	return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
148 }
149 
ip_vs_addr_copy(int af,union nf_inet_addr * dst,const union nf_inet_addr * src)150 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
151 				   const union nf_inet_addr *src)
152 {
153 #ifdef CONFIG_IP_VS_IPV6
154 	if (af == AF_INET6)
155 		dst->in6 = src->in6;
156 	else
157 #endif
158 	dst->ip = src->ip;
159 }
160 
ip_vs_addr_set(int af,union nf_inet_addr * dst,const union nf_inet_addr * src)161 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
162 				  const union nf_inet_addr *src)
163 {
164 #ifdef CONFIG_IP_VS_IPV6
165 	if (af == AF_INET6) {
166 		dst->in6 = src->in6;
167 		return;
168 	}
169 #endif
170 	dst->ip = src->ip;
171 	dst->all[1] = 0;
172 	dst->all[2] = 0;
173 	dst->all[3] = 0;
174 }
175 
ip_vs_addr_equal(int af,const union nf_inet_addr * a,const union nf_inet_addr * b)176 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
177 				   const union nf_inet_addr *b)
178 {
179 #ifdef CONFIG_IP_VS_IPV6
180 	if (af == AF_INET6)
181 		return ipv6_addr_equal(&a->in6, &b->in6);
182 #endif
183 	return a->ip == b->ip;
184 }
185 
186 #ifdef CONFIG_IP_VS_DEBUG
187 #include <linux/net.h>
188 
189 int ip_vs_get_debug_level(void);
190 
ip_vs_dbg_addr(int af,char * buf,size_t buf_len,const union nf_inet_addr * addr,int * idx)191 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
192 					 const union nf_inet_addr *addr,
193 					 int *idx)
194 {
195 	int len;
196 #ifdef CONFIG_IP_VS_IPV6
197 	if (af == AF_INET6)
198 		len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
199 			       &addr->in6) + 1;
200 	else
201 #endif
202 		len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
203 			       &addr->ip) + 1;
204 
205 	*idx += len;
206 	BUG_ON(*idx > buf_len + 1);
207 	return &buf[*idx - len];
208 }
209 
210 #define IP_VS_DBG_BUF(level, msg, ...)					\
211 	do {								\
212 		char ip_vs_dbg_buf[160];				\
213 		int ip_vs_dbg_idx = 0;					\
214 		if (level <= ip_vs_get_debug_level())			\
215 			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
216 	} while (0)
217 #define IP_VS_ERR_BUF(msg...)						\
218 	do {								\
219 		char ip_vs_dbg_buf[160];				\
220 		int ip_vs_dbg_idx = 0;					\
221 		pr_err(msg);						\
222 	} while (0)
223 
224 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
225 #define IP_VS_DBG_ADDR(af, addr)					\
226 	ip_vs_dbg_addr(af, ip_vs_dbg_buf,				\
227 		       sizeof(ip_vs_dbg_buf), addr,			\
228 		       &ip_vs_dbg_idx)
229 
230 #define IP_VS_DBG(level, msg, ...)					\
231 	do {								\
232 		if (level <= ip_vs_get_debug_level())			\
233 			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
234 	} while (0)
235 #define IP_VS_DBG_RL(msg, ...)						\
236 	do {								\
237 		if (net_ratelimit())					\
238 			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
239 	} while (0)
240 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)			\
241 	do {								\
242 		if (level <= ip_vs_get_debug_level())			\
243 			pp->debug_packet(af, pp, skb, ofs, msg);	\
244 	} while (0)
245 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)			\
246 	do {								\
247 		if (level <= ip_vs_get_debug_level() &&			\
248 		    net_ratelimit())					\
249 			pp->debug_packet(af, pp, skb, ofs, msg);	\
250 	} while (0)
251 #else	/* NO DEBUGGING at ALL */
252 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
253 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
254 #define IP_VS_DBG(level, msg...)  do {} while (0)
255 #define IP_VS_DBG_RL(msg...)  do {} while (0)
256 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)
257 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)
258 #endif
259 
260 #define IP_VS_BUG() BUG()
261 #define IP_VS_ERR_RL(msg, ...)						\
262 	do {								\
263 		if (net_ratelimit())					\
264 			pr_err(msg, ##__VA_ARGS__);			\
265 	} while (0)
266 
267 #ifdef CONFIG_IP_VS_DEBUG
268 #define EnterFunction(level)						\
269 	do {								\
270 		if (level <= ip_vs_get_debug_level())			\
271 			printk(KERN_DEBUG				\
272 			       pr_fmt("Enter: %s, %s line %i\n"),	\
273 			       __func__, __FILE__, __LINE__);		\
274 	} while (0)
275 #define LeaveFunction(level)						\
276 	do {								\
277 		if (level <= ip_vs_get_debug_level())			\
278 			printk(KERN_DEBUG				\
279 			       pr_fmt("Leave: %s, %s line %i\n"),	\
280 			       __func__, __FILE__, __LINE__);		\
281 	} while (0)
282 #else
283 #define EnterFunction(level)   do {} while (0)
284 #define LeaveFunction(level)   do {} while (0)
285 #endif
286 
287 /* The port number of FTP service (in network order). */
288 #define FTPPORT  cpu_to_be16(21)
289 #define FTPDATA  cpu_to_be16(20)
290 
291 /* TCP State Values */
292 enum {
293 	IP_VS_TCP_S_NONE = 0,
294 	IP_VS_TCP_S_ESTABLISHED,
295 	IP_VS_TCP_S_SYN_SENT,
296 	IP_VS_TCP_S_SYN_RECV,
297 	IP_VS_TCP_S_FIN_WAIT,
298 	IP_VS_TCP_S_TIME_WAIT,
299 	IP_VS_TCP_S_CLOSE,
300 	IP_VS_TCP_S_CLOSE_WAIT,
301 	IP_VS_TCP_S_LAST_ACK,
302 	IP_VS_TCP_S_LISTEN,
303 	IP_VS_TCP_S_SYNACK,
304 	IP_VS_TCP_S_LAST
305 };
306 
307 /* UDP State Values */
308 enum {
309 	IP_VS_UDP_S_NORMAL,
310 	IP_VS_UDP_S_LAST,
311 };
312 
313 /* ICMP State Values */
314 enum {
315 	IP_VS_ICMP_S_NORMAL,
316 	IP_VS_ICMP_S_LAST,
317 };
318 
319 /* SCTP State Values */
320 enum ip_vs_sctp_states {
321 	IP_VS_SCTP_S_NONE,
322 	IP_VS_SCTP_S_INIT1,
323 	IP_VS_SCTP_S_INIT,
324 	IP_VS_SCTP_S_COOKIE_SENT,
325 	IP_VS_SCTP_S_COOKIE_REPLIED,
326 	IP_VS_SCTP_S_COOKIE_WAIT,
327 	IP_VS_SCTP_S_COOKIE,
328 	IP_VS_SCTP_S_COOKIE_ECHOED,
329 	IP_VS_SCTP_S_ESTABLISHED,
330 	IP_VS_SCTP_S_SHUTDOWN_SENT,
331 	IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
332 	IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
333 	IP_VS_SCTP_S_REJECTED,
334 	IP_VS_SCTP_S_CLOSED,
335 	IP_VS_SCTP_S_LAST
336 };
337 
338 /* Connection templates use bits from state */
339 #define IP_VS_CTPL_S_NONE		0x0000
340 #define IP_VS_CTPL_S_ASSURED		0x0001
341 #define IP_VS_CTPL_S_LAST		0x0002
342 
343 /* Delta sequence info structure
344  * Each ip_vs_conn has 2 (output AND input seq. changes).
345  * Only used in the VS/NAT.
346  */
347 struct ip_vs_seq {
348 	__u32			init_seq;	/* Add delta from this seq */
349 	__u32			delta;		/* Delta in sequence numbers */
350 	__u32			previous_delta;	/* Delta in sequence numbers
351 						 * before last resized pkt */
352 };
353 
354 /* counters per cpu */
355 struct ip_vs_counters {
356 	__u64		conns;		/* connections scheduled */
357 	__u64		inpkts;		/* incoming packets */
358 	__u64		outpkts;	/* outgoing packets */
359 	__u64		inbytes;	/* incoming bytes */
360 	__u64		outbytes;	/* outgoing bytes */
361 };
362 /* Stats per cpu */
363 struct ip_vs_cpu_stats {
364 	struct ip_vs_counters   cnt;
365 	struct u64_stats_sync   syncp;
366 };
367 
368 /* IPVS statistics objects */
369 struct ip_vs_estimator {
370 	struct list_head	list;
371 
372 	u64			last_inbytes;
373 	u64			last_outbytes;
374 	u64			last_conns;
375 	u64			last_inpkts;
376 	u64			last_outpkts;
377 
378 	u64			cps;
379 	u64			inpps;
380 	u64			outpps;
381 	u64			inbps;
382 	u64			outbps;
383 };
384 
385 /*
386  * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
387  */
388 struct ip_vs_kstats {
389 	u64			conns;		/* connections scheduled */
390 	u64			inpkts;		/* incoming packets */
391 	u64			outpkts;	/* outgoing packets */
392 	u64			inbytes;	/* incoming bytes */
393 	u64			outbytes;	/* outgoing bytes */
394 
395 	u64			cps;		/* current connection rate */
396 	u64			inpps;		/* current in packet rate */
397 	u64			outpps;		/* current out packet rate */
398 	u64			inbps;		/* current in byte rate */
399 	u64			outbps;		/* current out byte rate */
400 };
401 
402 struct ip_vs_stats {
403 	struct ip_vs_kstats	kstats;		/* kernel statistics */
404 	struct ip_vs_estimator	est;		/* estimator */
405 	struct ip_vs_cpu_stats __percpu	*cpustats;	/* per cpu counters */
406 	spinlock_t		lock;		/* spin lock */
407 	struct ip_vs_kstats	kstats0;	/* reset values */
408 };
409 
410 struct dst_entry;
411 struct iphdr;
412 struct ip_vs_conn;
413 struct ip_vs_app;
414 struct sk_buff;
415 struct ip_vs_proto_data;
416 
417 struct ip_vs_protocol {
418 	struct ip_vs_protocol	*next;
419 	char			*name;
420 	u16			protocol;
421 	u16			num_states;
422 	int			dont_defrag;
423 
424 	void (*init)(struct ip_vs_protocol *pp);
425 
426 	void (*exit)(struct ip_vs_protocol *pp);
427 
428 	int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
429 
430 	void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
431 
432 	int (*conn_schedule)(struct netns_ipvs *ipvs,
433 			     int af, struct sk_buff *skb,
434 			     struct ip_vs_proto_data *pd,
435 			     int *verdict, struct ip_vs_conn **cpp,
436 			     struct ip_vs_iphdr *iph);
437 
438 	struct ip_vs_conn *
439 	(*conn_in_get)(struct netns_ipvs *ipvs,
440 		       int af,
441 		       const struct sk_buff *skb,
442 		       const struct ip_vs_iphdr *iph);
443 
444 	struct ip_vs_conn *
445 	(*conn_out_get)(struct netns_ipvs *ipvs,
446 			int af,
447 			const struct sk_buff *skb,
448 			const struct ip_vs_iphdr *iph);
449 
450 	int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
451 			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
452 
453 	int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
454 			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
455 
456 	int (*csum_check)(int af, struct sk_buff *skb,
457 			  struct ip_vs_protocol *pp);
458 
459 	const char *(*state_name)(int state);
460 
461 	void (*state_transition)(struct ip_vs_conn *cp, int direction,
462 				 const struct sk_buff *skb,
463 				 struct ip_vs_proto_data *pd);
464 
465 	int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
466 
467 	void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
468 
469 	int (*app_conn_bind)(struct ip_vs_conn *cp);
470 
471 	void (*debug_packet)(int af, struct ip_vs_protocol *pp,
472 			     const struct sk_buff *skb,
473 			     int offset,
474 			     const char *msg);
475 
476 	void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
477 };
478 
479 /* protocol data per netns */
480 struct ip_vs_proto_data {
481 	struct ip_vs_proto_data	*next;
482 	struct ip_vs_protocol	*pp;
483 	int			*timeout_table;	/* protocol timeout table */
484 	atomic_t		appcnt;		/* counter of proto app incs. */
485 	struct tcp_states_t	*tcp_state_table;
486 };
487 
488 struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
489 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
490 					      unsigned short proto);
491 
492 struct ip_vs_conn_param {
493 	struct netns_ipvs		*ipvs;
494 	const union nf_inet_addr	*caddr;
495 	const union nf_inet_addr	*vaddr;
496 	__be16				cport;
497 	__be16				vport;
498 	__u16				protocol;
499 	u16				af;
500 
501 	const struct ip_vs_pe		*pe;
502 	char				*pe_data;
503 	__u8				pe_data_len;
504 };
505 
506 /* IP_VS structure allocated for each dynamically scheduled connection */
507 struct ip_vs_conn {
508 	struct hlist_node	c_list;         /* hashed list heads */
509 	/* Protocol, addresses and port numbers */
510 	__be16                  cport;
511 	__be16                  dport;
512 	__be16                  vport;
513 	u16			af;		/* address family */
514 	union nf_inet_addr      caddr;          /* client address */
515 	union nf_inet_addr      vaddr;          /* virtual address */
516 	union nf_inet_addr      daddr;          /* destination address */
517 	volatile __u32          flags;          /* status flags */
518 	__u16                   protocol;       /* Which protocol (TCP/UDP) */
519 	__u16			daf;		/* Address family of the dest */
520 	struct netns_ipvs	*ipvs;
521 
522 	/* counter and timer */
523 	refcount_t		refcnt;		/* reference count */
524 	struct timer_list	timer;		/* Expiration timer */
525 	volatile unsigned long	timeout;	/* timeout */
526 
527 	/* Flags and state transition */
528 	spinlock_t              lock;           /* lock for state transition */
529 	volatile __u16          state;          /* state info */
530 	volatile __u16          old_state;      /* old state, to be used for
531 						 * state transition triggerd
532 						 * synchronization
533 						 */
534 	__u32			fwmark;		/* Fire wall mark from skb */
535 	unsigned long		sync_endtime;	/* jiffies + sent_retries */
536 
537 	/* Control members */
538 	struct ip_vs_conn       *control;       /* Master control connection */
539 	atomic_t                n_control;      /* Number of controlled ones */
540 	struct ip_vs_dest       *dest;          /* real server */
541 	atomic_t                in_pkts;        /* incoming packet counter */
542 
543 	/* Packet transmitter for different forwarding methods.  If it
544 	 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
545 	 * otherwise this must be changed to a sk_buff **.
546 	 * NF_ACCEPT can be returned when destination is local.
547 	 */
548 	int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
549 			   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
550 
551 	/* Note: we can group the following members into a structure,
552 	 * in order to save more space, and the following members are
553 	 * only used in VS/NAT anyway
554 	 */
555 	struct ip_vs_app        *app;           /* bound ip_vs_app object */
556 	void                    *app_data;      /* Application private data */
557 	struct ip_vs_seq        in_seq;         /* incoming seq. struct */
558 	struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
559 
560 	const struct ip_vs_pe	*pe;
561 	char			*pe_data;
562 	__u8			pe_data_len;
563 
564 	struct rcu_head		rcu_head;
565 };
566 
567 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
568  * for IPv6 support.
569  *
570  * We need these to conveniently pass around service and destination
571  * options, but unfortunately, we also need to keep the old definitions to
572  * maintain userspace backwards compatibility for the setsockopt interface.
573  */
574 struct ip_vs_service_user_kern {
575 	/* virtual service addresses */
576 	u16			af;
577 	u16			protocol;
578 	union nf_inet_addr	addr;		/* virtual ip address */
579 	__be16			port;
580 	u32			fwmark;		/* firwall mark of service */
581 
582 	/* virtual service options */
583 	char			*sched_name;
584 	char			*pe_name;
585 	unsigned int		flags;		/* virtual service flags */
586 	unsigned int		timeout;	/* persistent timeout in sec */
587 	__be32			netmask;	/* persistent netmask or plen */
588 };
589 
590 
591 struct ip_vs_dest_user_kern {
592 	/* destination server address */
593 	union nf_inet_addr	addr;
594 	__be16			port;
595 
596 	/* real server options */
597 	unsigned int		conn_flags;	/* connection flags */
598 	int			weight;		/* destination weight */
599 
600 	/* thresholds for active connections */
601 	u32			u_threshold;	/* upper threshold */
602 	u32			l_threshold;	/* lower threshold */
603 
604 	/* Address family of addr */
605 	u16			af;
606 };
607 
608 
609 /*
610  * The information about the virtual service offered to the net and the
611  * forwarding entries.
612  */
613 struct ip_vs_service {
614 	struct hlist_node	s_list;   /* for normal service table */
615 	struct hlist_node	f_list;   /* for fwmark-based service table */
616 	atomic_t		refcnt;   /* reference counter */
617 
618 	u16			af;       /* address family */
619 	__u16			protocol; /* which protocol (TCP/UDP) */
620 	union nf_inet_addr	addr;	  /* IP address for virtual service */
621 	__be16			port;	  /* port number for the service */
622 	__u32                   fwmark;   /* firewall mark of the service */
623 	unsigned int		flags;	  /* service status flags */
624 	unsigned int		timeout;  /* persistent timeout in ticks */
625 	__be32			netmask;  /* grouping granularity, mask/plen */
626 	struct netns_ipvs	*ipvs;
627 
628 	struct list_head	destinations;  /* real server d-linked list */
629 	__u32			num_dests;     /* number of servers */
630 	struct ip_vs_stats      stats;         /* statistics for the service */
631 
632 	/* for scheduling */
633 	struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
634 	spinlock_t		sched_lock;    /* lock sched_data */
635 	void			*sched_data;   /* scheduler application data */
636 
637 	/* alternate persistence engine */
638 	struct ip_vs_pe __rcu	*pe;
639 	int			conntrack_afmask;
640 
641 	struct rcu_head		rcu_head;
642 };
643 
644 /* Information for cached dst */
645 struct ip_vs_dest_dst {
646 	struct dst_entry	*dst_cache;	/* destination cache entry */
647 	u32			dst_cookie;
648 	union nf_inet_addr	dst_saddr;
649 	struct rcu_head		rcu_head;
650 };
651 
652 /* The real server destination forwarding entry with ip address, port number,
653  * and so on.
654  */
655 struct ip_vs_dest {
656 	struct list_head	n_list;   /* for the dests in the service */
657 	struct hlist_node	d_list;   /* for table with all the dests */
658 
659 	u16			af;		/* address family */
660 	__be16			port;		/* port number of the server */
661 	union nf_inet_addr	addr;		/* IP address of the server */
662 	volatile unsigned int	flags;		/* dest status flags */
663 	atomic_t		conn_flags;	/* flags to copy to conn */
664 	atomic_t		weight;		/* server weight */
665 	atomic_t		last_weight;	/* server latest weight */
666 
667 	refcount_t		refcnt;		/* reference counter */
668 	struct ip_vs_stats      stats;          /* statistics */
669 	unsigned long		idle_start;	/* start time, jiffies */
670 
671 	/* connection counters and thresholds */
672 	atomic_t		activeconns;	/* active connections */
673 	atomic_t		inactconns;	/* inactive connections */
674 	atomic_t		persistconns;	/* persistent connections */
675 	__u32			u_threshold;	/* upper threshold */
676 	__u32			l_threshold;	/* lower threshold */
677 
678 	/* for destination cache */
679 	spinlock_t		dst_lock;	/* lock of dst_cache */
680 	struct ip_vs_dest_dst __rcu *dest_dst;	/* cached dst info */
681 
682 	/* for virtual service */
683 	struct ip_vs_service __rcu *svc;	/* service it belongs to */
684 	__u16			protocol;	/* which protocol (TCP/UDP) */
685 	__be16			vport;		/* virtual port number */
686 	union nf_inet_addr	vaddr;		/* virtual IP address */
687 	__u32			vfwmark;	/* firewall mark of service */
688 
689 	struct list_head	t_list;		/* in dest_trash */
690 	unsigned int		in_rs_table:1;	/* we are in rs_table */
691 };
692 
693 /* The scheduler object */
694 struct ip_vs_scheduler {
695 	struct list_head	n_list;		/* d-linked list head */
696 	char			*name;		/* scheduler name */
697 	atomic_t		refcnt;		/* reference counter */
698 	struct module		*module;	/* THIS_MODULE/NULL */
699 
700 	/* scheduler initializing service */
701 	int (*init_service)(struct ip_vs_service *svc);
702 	/* scheduling service finish */
703 	void (*done_service)(struct ip_vs_service *svc);
704 	/* dest is linked */
705 	int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
706 	/* dest is unlinked */
707 	int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
708 	/* dest is updated */
709 	int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
710 
711 	/* selecting a server from the given service */
712 	struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
713 				       const struct sk_buff *skb,
714 				       struct ip_vs_iphdr *iph);
715 };
716 
717 /* The persistence engine object */
718 struct ip_vs_pe {
719 	struct list_head	n_list;		/* d-linked list head */
720 	char			*name;		/* scheduler name */
721 	atomic_t		refcnt;		/* reference counter */
722 	struct module		*module;	/* THIS_MODULE/NULL */
723 
724 	/* get the connection template, if any */
725 	int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
726 	bool (*ct_match)(const struct ip_vs_conn_param *p,
727 			 struct ip_vs_conn *ct);
728 	u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
729 			   bool inverse);
730 	int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
731 	/* create connections for real-server outgoing packets */
732 	struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
733 				       struct ip_vs_dest *dest,
734 				       struct sk_buff *skb,
735 				       const struct ip_vs_iphdr *iph,
736 				       __be16 dport, __be16 cport);
737 };
738 
739 /* The application module object (a.k.a. app incarnation) */
740 struct ip_vs_app {
741 	struct list_head	a_list;		/* member in app list */
742 	int			type;		/* IP_VS_APP_TYPE_xxx */
743 	char			*name;		/* application module name */
744 	__u16			protocol;
745 	struct module		*module;	/* THIS_MODULE/NULL */
746 	struct list_head	incs_list;	/* list of incarnations */
747 
748 	/* members for application incarnations */
749 	struct list_head	p_list;		/* member in proto app list */
750 	struct ip_vs_app	*app;		/* its real application */
751 	__be16			port;		/* port number in net order */
752 	atomic_t		usecnt;		/* usage counter */
753 	struct rcu_head		rcu_head;
754 
755 	/* output hook: Process packet in inout direction, diff set for TCP.
756 	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
757 	 *	   2=Mangled but checksum was not updated
758 	 */
759 	int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
760 		       struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
761 
762 	/* input hook: Process packet in outin direction, diff set for TCP.
763 	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
764 	 *	   2=Mangled but checksum was not updated
765 	 */
766 	int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
767 		      struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
768 
769 	/* ip_vs_app initializer */
770 	int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
771 
772 	/* ip_vs_app finish */
773 	int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
774 
775 
776 	/* not used now */
777 	int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
778 			 struct ip_vs_protocol *);
779 
780 	void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
781 
782 	int *			timeout_table;
783 	int *			timeouts;
784 	int			timeouts_size;
785 
786 	int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
787 			     int *verdict, struct ip_vs_conn **cpp);
788 
789 	struct ip_vs_conn *
790 	(*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
791 		       const struct iphdr *iph, int inverse);
792 
793 	struct ip_vs_conn *
794 	(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
795 			const struct iphdr *iph, int inverse);
796 
797 	int (*state_transition)(struct ip_vs_conn *cp, int direction,
798 				const struct sk_buff *skb,
799 				struct ip_vs_app *app);
800 
801 	void (*timeout_change)(struct ip_vs_app *app, int flags);
802 };
803 
804 struct ipvs_master_sync_state {
805 	struct list_head	sync_queue;
806 	struct ip_vs_sync_buff	*sync_buff;
807 	unsigned long		sync_queue_len;
808 	unsigned int		sync_queue_delay;
809 	struct task_struct	*master_thread;
810 	struct delayed_work	master_wakeup_work;
811 	struct netns_ipvs	*ipvs;
812 };
813 
814 /* How much time to keep dests in trash */
815 #define IP_VS_DEST_TRASH_PERIOD		(120 * HZ)
816 
817 struct ipvs_sync_daemon_cfg {
818 	union nf_inet_addr	mcast_group;
819 	int			syncid;
820 	u16			sync_maxlen;
821 	u16			mcast_port;
822 	u8			mcast_af;
823 	u8			mcast_ttl;
824 	/* multicast interface name */
825 	char			mcast_ifn[IP_VS_IFNAME_MAXLEN];
826 };
827 
828 /* IPVS in network namespace */
829 struct netns_ipvs {
830 	int			gen;		/* Generation */
831 	int			enable;		/* enable like nf_hooks do */
832 	/* Hash table: for real service lookups */
833 	#define IP_VS_RTAB_BITS 4
834 	#define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
835 	#define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
836 
837 	struct hlist_head	rs_table[IP_VS_RTAB_SIZE];
838 	/* ip_vs_app */
839 	struct list_head	app_list;
840 	/* ip_vs_proto */
841 	#define IP_VS_PROTO_TAB_SIZE	32	/* must be power of 2 */
842 	struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
843 	/* ip_vs_proto_tcp */
844 #ifdef CONFIG_IP_VS_PROTO_TCP
845 	#define	TCP_APP_TAB_BITS	4
846 	#define	TCP_APP_TAB_SIZE	(1 << TCP_APP_TAB_BITS)
847 	#define	TCP_APP_TAB_MASK	(TCP_APP_TAB_SIZE - 1)
848 	struct list_head	tcp_apps[TCP_APP_TAB_SIZE];
849 #endif
850 	/* ip_vs_proto_udp */
851 #ifdef CONFIG_IP_VS_PROTO_UDP
852 	#define	UDP_APP_TAB_BITS	4
853 	#define	UDP_APP_TAB_SIZE	(1 << UDP_APP_TAB_BITS)
854 	#define	UDP_APP_TAB_MASK	(UDP_APP_TAB_SIZE - 1)
855 	struct list_head	udp_apps[UDP_APP_TAB_SIZE];
856 #endif
857 	/* ip_vs_proto_sctp */
858 #ifdef CONFIG_IP_VS_PROTO_SCTP
859 	#define SCTP_APP_TAB_BITS	4
860 	#define SCTP_APP_TAB_SIZE	(1 << SCTP_APP_TAB_BITS)
861 	#define SCTP_APP_TAB_MASK	(SCTP_APP_TAB_SIZE - 1)
862 	/* Hash table for SCTP application incarnations	 */
863 	struct list_head	sctp_apps[SCTP_APP_TAB_SIZE];
864 #endif
865 	/* ip_vs_conn */
866 	atomic_t		conn_count;      /* connection counter */
867 
868 	/* ip_vs_ctl */
869 	struct ip_vs_stats		tot_stats;  /* Statistics & est. */
870 
871 	int			num_services;    /* no of virtual services */
872 
873 	/* Trash for destinations */
874 	struct list_head	dest_trash;
875 	spinlock_t		dest_trash_lock;
876 	struct timer_list	dest_trash_timer; /* expiration timer */
877 	/* Service counters */
878 	atomic_t		ftpsvc_counter;
879 	atomic_t		nullsvc_counter;
880 	atomic_t		conn_out_counter;
881 
882 #ifdef CONFIG_SYSCTL
883 	/* 1/rate drop and drop-entry variables */
884 	struct delayed_work	defense_work;   /* Work handler */
885 	int			drop_rate;
886 	int			drop_counter;
887 	atomic_t		dropentry;
888 	/* locks in ctl.c */
889 	spinlock_t		dropentry_lock;  /* drop entry handling */
890 	spinlock_t		droppacket_lock; /* drop packet handling */
891 	spinlock_t		securetcp_lock;  /* state and timeout tables */
892 
893 	/* sys-ctl struct */
894 	struct ctl_table_header	*sysctl_hdr;
895 	struct ctl_table	*sysctl_tbl;
896 #endif
897 
898 	/* sysctl variables */
899 	int			sysctl_amemthresh;
900 	int			sysctl_am_droprate;
901 	int			sysctl_drop_entry;
902 	int			sysctl_drop_packet;
903 	int			sysctl_secure_tcp;
904 #ifdef CONFIG_IP_VS_NFCT
905 	int			sysctl_conntrack;
906 #endif
907 	int			sysctl_snat_reroute;
908 	int			sysctl_sync_ver;
909 	int			sysctl_sync_ports;
910 	int			sysctl_sync_persist_mode;
911 	unsigned long		sysctl_sync_qlen_max;
912 	int			sysctl_sync_sock_size;
913 	int			sysctl_cache_bypass;
914 	int			sysctl_expire_nodest_conn;
915 	int			sysctl_sloppy_tcp;
916 	int			sysctl_sloppy_sctp;
917 	int			sysctl_expire_quiescent_template;
918 	int			sysctl_sync_threshold[2];
919 	unsigned int		sysctl_sync_refresh_period;
920 	int			sysctl_sync_retries;
921 	int			sysctl_nat_icmp_send;
922 	int			sysctl_pmtu_disc;
923 	int			sysctl_backup_only;
924 	int			sysctl_conn_reuse_mode;
925 	int			sysctl_schedule_icmp;
926 	int			sysctl_ignore_tunneled;
927 
928 	/* ip_vs_lblc */
929 	int			sysctl_lblc_expiration;
930 	struct ctl_table_header	*lblc_ctl_header;
931 	struct ctl_table	*lblc_ctl_table;
932 	/* ip_vs_lblcr */
933 	int			sysctl_lblcr_expiration;
934 	struct ctl_table_header	*lblcr_ctl_header;
935 	struct ctl_table	*lblcr_ctl_table;
936 	/* ip_vs_est */
937 	struct list_head	est_list;	/* estimator list */
938 	spinlock_t		est_lock;
939 	struct timer_list	est_timer;	/* Estimation timer */
940 	/* ip_vs_sync */
941 	spinlock_t		sync_lock;
942 	struct ipvs_master_sync_state *ms;
943 	spinlock_t		sync_buff_lock;
944 	struct task_struct	**backup_threads;
945 	int			threads_mask;
946 	volatile int		sync_state;
947 	struct mutex		sync_mutex;
948 	struct ipvs_sync_daemon_cfg	mcfg;	/* Master Configuration */
949 	struct ipvs_sync_daemon_cfg	bcfg;	/* Backup Configuration */
950 	/* net name space ptr */
951 	struct net		*net;            /* Needed by timer routines */
952 	/* Number of heterogeneous destinations, needed becaus heterogeneous
953 	 * are not supported when synchronization is enabled.
954 	 */
955 	unsigned int		mixed_address_family_dests;
956 };
957 
958 #define DEFAULT_SYNC_THRESHOLD	3
959 #define DEFAULT_SYNC_PERIOD	50
960 #define DEFAULT_SYNC_VER	1
961 #define DEFAULT_SLOPPY_TCP	0
962 #define DEFAULT_SLOPPY_SCTP	0
963 #define DEFAULT_SYNC_REFRESH_PERIOD	(0U * HZ)
964 #define DEFAULT_SYNC_RETRIES		0
965 #define IPVS_SYNC_WAKEUP_RATE	8
966 #define IPVS_SYNC_QLEN_MAX	(IPVS_SYNC_WAKEUP_RATE * 4)
967 #define IPVS_SYNC_SEND_DELAY	(HZ / 50)
968 #define IPVS_SYNC_CHECK_PERIOD	HZ
969 #define IPVS_SYNC_FLUSH_TIME	(HZ * 2)
970 #define IPVS_SYNC_PORTS_MAX	(1 << 6)
971 
972 #ifdef CONFIG_SYSCTL
973 
sysctl_sync_threshold(struct netns_ipvs * ipvs)974 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
975 {
976 	return ipvs->sysctl_sync_threshold[0];
977 }
978 
sysctl_sync_period(struct netns_ipvs * ipvs)979 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
980 {
981 	return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
982 }
983 
sysctl_sync_refresh_period(struct netns_ipvs * ipvs)984 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
985 {
986 	return READ_ONCE(ipvs->sysctl_sync_refresh_period);
987 }
988 
sysctl_sync_retries(struct netns_ipvs * ipvs)989 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
990 {
991 	return ipvs->sysctl_sync_retries;
992 }
993 
sysctl_sync_ver(struct netns_ipvs * ipvs)994 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
995 {
996 	return ipvs->sysctl_sync_ver;
997 }
998 
sysctl_sloppy_tcp(struct netns_ipvs * ipvs)999 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1000 {
1001 	return ipvs->sysctl_sloppy_tcp;
1002 }
1003 
sysctl_sloppy_sctp(struct netns_ipvs * ipvs)1004 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1005 {
1006 	return ipvs->sysctl_sloppy_sctp;
1007 }
1008 
sysctl_sync_ports(struct netns_ipvs * ipvs)1009 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1010 {
1011 	return READ_ONCE(ipvs->sysctl_sync_ports);
1012 }
1013 
sysctl_sync_persist_mode(struct netns_ipvs * ipvs)1014 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1015 {
1016 	return ipvs->sysctl_sync_persist_mode;
1017 }
1018 
sysctl_sync_qlen_max(struct netns_ipvs * ipvs)1019 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1020 {
1021 	return ipvs->sysctl_sync_qlen_max;
1022 }
1023 
sysctl_sync_sock_size(struct netns_ipvs * ipvs)1024 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1025 {
1026 	return ipvs->sysctl_sync_sock_size;
1027 }
1028 
sysctl_pmtu_disc(struct netns_ipvs * ipvs)1029 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1030 {
1031 	return ipvs->sysctl_pmtu_disc;
1032 }
1033 
sysctl_backup_only(struct netns_ipvs * ipvs)1034 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1035 {
1036 	return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1037 	       ipvs->sysctl_backup_only;
1038 }
1039 
sysctl_conn_reuse_mode(struct netns_ipvs * ipvs)1040 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1041 {
1042 	return ipvs->sysctl_conn_reuse_mode;
1043 }
1044 
sysctl_schedule_icmp(struct netns_ipvs * ipvs)1045 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1046 {
1047 	return ipvs->sysctl_schedule_icmp;
1048 }
1049 
sysctl_ignore_tunneled(struct netns_ipvs * ipvs)1050 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1051 {
1052 	return ipvs->sysctl_ignore_tunneled;
1053 }
1054 
sysctl_cache_bypass(struct netns_ipvs * ipvs)1055 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1056 {
1057 	return ipvs->sysctl_cache_bypass;
1058 }
1059 
1060 #else
1061 
sysctl_sync_threshold(struct netns_ipvs * ipvs)1062 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1063 {
1064 	return DEFAULT_SYNC_THRESHOLD;
1065 }
1066 
sysctl_sync_period(struct netns_ipvs * ipvs)1067 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1068 {
1069 	return DEFAULT_SYNC_PERIOD;
1070 }
1071 
sysctl_sync_refresh_period(struct netns_ipvs * ipvs)1072 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1073 {
1074 	return DEFAULT_SYNC_REFRESH_PERIOD;
1075 }
1076 
sysctl_sync_retries(struct netns_ipvs * ipvs)1077 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1078 {
1079 	return DEFAULT_SYNC_RETRIES & 3;
1080 }
1081 
sysctl_sync_ver(struct netns_ipvs * ipvs)1082 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1083 {
1084 	return DEFAULT_SYNC_VER;
1085 }
1086 
sysctl_sloppy_tcp(struct netns_ipvs * ipvs)1087 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1088 {
1089 	return DEFAULT_SLOPPY_TCP;
1090 }
1091 
sysctl_sloppy_sctp(struct netns_ipvs * ipvs)1092 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1093 {
1094 	return DEFAULT_SLOPPY_SCTP;
1095 }
1096 
sysctl_sync_ports(struct netns_ipvs * ipvs)1097 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1098 {
1099 	return 1;
1100 }
1101 
sysctl_sync_persist_mode(struct netns_ipvs * ipvs)1102 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1103 {
1104 	return 0;
1105 }
1106 
sysctl_sync_qlen_max(struct netns_ipvs * ipvs)1107 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1108 {
1109 	return IPVS_SYNC_QLEN_MAX;
1110 }
1111 
sysctl_sync_sock_size(struct netns_ipvs * ipvs)1112 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1113 {
1114 	return 0;
1115 }
1116 
sysctl_pmtu_disc(struct netns_ipvs * ipvs)1117 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1118 {
1119 	return 1;
1120 }
1121 
sysctl_backup_only(struct netns_ipvs * ipvs)1122 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1123 {
1124 	return 0;
1125 }
1126 
sysctl_conn_reuse_mode(struct netns_ipvs * ipvs)1127 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1128 {
1129 	return 1;
1130 }
1131 
sysctl_schedule_icmp(struct netns_ipvs * ipvs)1132 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1133 {
1134 	return 0;
1135 }
1136 
sysctl_ignore_tunneled(struct netns_ipvs * ipvs)1137 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1138 {
1139 	return 0;
1140 }
1141 
sysctl_cache_bypass(struct netns_ipvs * ipvs)1142 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1143 {
1144 	return 0;
1145 }
1146 
1147 #endif
1148 
1149 /* IPVS core functions
1150  * (from ip_vs_core.c)
1151  */
1152 const char *ip_vs_proto_name(unsigned int proto);
1153 void ip_vs_init_hash_table(struct list_head *table, int rows);
1154 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1155 				      struct ip_vs_dest *dest,
1156 				      struct sk_buff *skb,
1157 				      const struct ip_vs_iphdr *iph,
1158 				      __be16 dport,
1159 				      __be16 cport);
1160 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1161 
1162 #define IP_VS_APP_TYPE_FTP	1
1163 
1164 /* ip_vs_conn handling functions
1165  * (from ip_vs_conn.c)
1166  */
1167 enum {
1168 	IP_VS_DIR_INPUT = 0,
1169 	IP_VS_DIR_OUTPUT,
1170 	IP_VS_DIR_INPUT_ONLY,
1171 	IP_VS_DIR_LAST,
1172 };
1173 
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)1174 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1175 					 const union nf_inet_addr *caddr,
1176 					 __be16 cport,
1177 					 const union nf_inet_addr *vaddr,
1178 					 __be16 vport,
1179 					 struct ip_vs_conn_param *p)
1180 {
1181 	p->ipvs = ipvs;
1182 	p->af = af;
1183 	p->protocol = protocol;
1184 	p->caddr = caddr;
1185 	p->cport = cport;
1186 	p->vaddr = vaddr;
1187 	p->vport = vport;
1188 	p->pe = NULL;
1189 	p->pe_data = NULL;
1190 }
1191 
1192 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1193 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1194 
1195 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1196 					    const struct sk_buff *skb,
1197 					    const struct ip_vs_iphdr *iph);
1198 
1199 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1200 
1201 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1202 					     const struct sk_buff *skb,
1203 					     const struct ip_vs_iphdr *iph);
1204 
1205 /* Get reference to gain full access to conn.
1206  * By default, RCU read-side critical sections have access only to
1207  * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1208  */
__ip_vs_conn_get(struct ip_vs_conn * cp)1209 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1210 {
1211 	return refcount_inc_not_zero(&cp->refcnt);
1212 }
1213 
1214 /* put back the conn without restarting its timer */
__ip_vs_conn_put(struct ip_vs_conn * cp)1215 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1216 {
1217 	smp_mb__before_atomic();
1218 	refcount_dec(&cp->refcnt);
1219 }
1220 void ip_vs_conn_put(struct ip_vs_conn *cp);
1221 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1222 
1223 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1224 				  const union nf_inet_addr *daddr,
1225 				  __be16 dport, unsigned int flags,
1226 				  struct ip_vs_dest *dest, __u32 fwmark);
1227 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1228 
1229 const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1230 
1231 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1232 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1233 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1234 int ip_vs_conn_init(void);
1235 void ip_vs_conn_cleanup(void);
1236 
ip_vs_control_del(struct ip_vs_conn * cp)1237 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1238 {
1239 	struct ip_vs_conn *ctl_cp = cp->control;
1240 	if (!ctl_cp) {
1241 		IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1242 			      "%s:%d to %s:%d\n",
1243 			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1244 			      ntohs(cp->cport),
1245 			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1246 			      ntohs(cp->vport));
1247 
1248 		return;
1249 	}
1250 
1251 	IP_VS_DBG_BUF(7, "DELeting control for: "
1252 		      "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1253 		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1254 		      ntohs(cp->cport),
1255 		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1256 		      ntohs(ctl_cp->cport));
1257 
1258 	cp->control = NULL;
1259 	if (atomic_read(&ctl_cp->n_control) == 0) {
1260 		IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1261 			      "%s:%d to %s:%d\n",
1262 			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1263 			      ntohs(cp->cport),
1264 			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1265 			      ntohs(cp->vport));
1266 
1267 		return;
1268 	}
1269 	atomic_dec(&ctl_cp->n_control);
1270 }
1271 
1272 static inline void
ip_vs_control_add(struct ip_vs_conn * cp,struct ip_vs_conn * ctl_cp)1273 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1274 {
1275 	if (cp->control) {
1276 		IP_VS_ERR_BUF("request control ADD for already controlled: "
1277 			      "%s:%d to %s:%d\n",
1278 			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1279 			      ntohs(cp->cport),
1280 			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1281 			      ntohs(cp->vport));
1282 
1283 		ip_vs_control_del(cp);
1284 	}
1285 
1286 	IP_VS_DBG_BUF(7, "ADDing control for: "
1287 		      "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1288 		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1289 		      ntohs(cp->cport),
1290 		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1291 		      ntohs(ctl_cp->cport));
1292 
1293 	cp->control = ctl_cp;
1294 	atomic_inc(&ctl_cp->n_control);
1295 }
1296 
1297 /* Mark our template as assured */
1298 static inline void
ip_vs_control_assure_ct(struct ip_vs_conn * cp)1299 ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1300 {
1301 	struct ip_vs_conn *ct = cp->control;
1302 
1303 	if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1304 	    (ct->flags & IP_VS_CONN_F_TEMPLATE))
1305 		ct->state |= IP_VS_CTPL_S_ASSURED;
1306 }
1307 
1308 /* IPVS netns init & cleanup functions */
1309 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1310 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1311 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1312 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1313 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1314 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1315 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1316 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1317 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1318 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1319 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1320 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1321 void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1322 
1323 /* IPVS application functions
1324  * (from ip_vs_app.c)
1325  */
1326 #define IP_VS_APP_MAX_PORTS  8
1327 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1328 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1329 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1330 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1331 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1332 			   __u16 port);
1333 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1334 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1335 
1336 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1337 		      struct ip_vs_iphdr *ipvsh);
1338 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1339 		     struct ip_vs_iphdr *ipvsh);
1340 
1341 int register_ip_vs_pe(struct ip_vs_pe *pe);
1342 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1343 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1344 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1345 
1346 /* Use a #define to avoid all of module.h just for these trivial ops */
1347 #define ip_vs_pe_get(pe)			\
1348 	if (pe && pe->module)			\
1349 		__module_get(pe->module);
1350 
1351 #define ip_vs_pe_put(pe)			\
1352 	if (pe && pe->module)			\
1353 		module_put(pe->module);
1354 
1355 /* IPVS protocol functions (from ip_vs_proto.c) */
1356 int ip_vs_protocol_init(void);
1357 void ip_vs_protocol_cleanup(void);
1358 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1359 int *ip_vs_create_timeout_table(int *table, int size);
1360 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1361 			       const struct sk_buff *skb, int offset,
1362 			       const char *msg);
1363 
1364 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1365 extern struct ip_vs_protocol ip_vs_protocol_udp;
1366 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1367 extern struct ip_vs_protocol ip_vs_protocol_esp;
1368 extern struct ip_vs_protocol ip_vs_protocol_ah;
1369 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1370 
1371 /* Registering/unregistering scheduler functions
1372  * (from ip_vs_sched.c)
1373  */
1374 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1375 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1376 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1377 			 struct ip_vs_scheduler *scheduler);
1378 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1379 			    struct ip_vs_scheduler *sched);
1380 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1381 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1382 struct ip_vs_conn *
1383 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1384 	       struct ip_vs_proto_data *pd, int *ignored,
1385 	       struct ip_vs_iphdr *iph);
1386 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1387 		struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1388 
1389 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1390 
1391 /* IPVS control data and functions (from ip_vs_ctl.c) */
1392 extern struct ip_vs_stats ip_vs_stats;
1393 extern int sysctl_ip_vs_sync_ver;
1394 
1395 struct ip_vs_service *
1396 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1397 		  const union nf_inet_addr *vaddr, __be16 vport);
1398 
1399 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1400 			    const union nf_inet_addr *daddr, __be16 dport);
1401 
1402 struct ip_vs_dest *
1403 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1404 			const union nf_inet_addr *daddr, __be16 dport);
1405 
1406 int ip_vs_use_count_inc(void);
1407 void ip_vs_use_count_dec(void);
1408 int ip_vs_register_nl_ioctl(void);
1409 void ip_vs_unregister_nl_ioctl(void);
1410 int ip_vs_control_init(void);
1411 void ip_vs_control_cleanup(void);
1412 struct ip_vs_dest *
1413 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1414 		const union nf_inet_addr *daddr, __be16 dport,
1415 		const union nf_inet_addr *vaddr, __be16 vport,
1416 		__u16 protocol, __u32 fwmark, __u32 flags);
1417 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1418 
ip_vs_dest_hold(struct ip_vs_dest * dest)1419 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1420 {
1421 	refcount_inc(&dest->refcnt);
1422 }
1423 
ip_vs_dest_put(struct ip_vs_dest * dest)1424 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1425 {
1426 	smp_mb__before_atomic();
1427 	refcount_dec(&dest->refcnt);
1428 }
1429 
ip_vs_dest_put_and_free(struct ip_vs_dest * dest)1430 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1431 {
1432 	if (refcount_dec_and_test(&dest->refcnt))
1433 		kfree(dest);
1434 }
1435 
1436 /* IPVS sync daemon data and function prototypes
1437  * (from ip_vs_sync.c)
1438  */
1439 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1440 		      int state);
1441 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1442 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1443 
1444 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1445 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1446 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1447 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1448 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1449 
1450 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1451 int ip_vs_null_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_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1454 		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1455 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1456 		   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1457 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1458 		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1459 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1460 		  struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1461 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1462 		    struct ip_vs_protocol *pp, int offset,
1463 		    unsigned int hooknum, struct ip_vs_iphdr *iph);
1464 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1465 
1466 #ifdef CONFIG_IP_VS_IPV6
1467 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1468 			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1469 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1470 		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1471 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1472 			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1473 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1474 		     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1475 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1476 		       struct ip_vs_protocol *pp, int offset,
1477 		       unsigned int hooknum, struct ip_vs_iphdr *iph);
1478 #endif
1479 
1480 #ifdef CONFIG_SYSCTL
1481 /* This is a simple mechanism to ignore packets when
1482  * we are loaded. Just set ip_vs_drop_rate to 'n' and
1483  * we start to drop 1/rate of the packets
1484  */
ip_vs_todrop(struct netns_ipvs * ipvs)1485 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1486 {
1487 	if (!ipvs->drop_rate)
1488 		return 0;
1489 	if (--ipvs->drop_counter > 0)
1490 		return 0;
1491 	ipvs->drop_counter = ipvs->drop_rate;
1492 	return 1;
1493 }
1494 #else
ip_vs_todrop(struct netns_ipvs * ipvs)1495 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1496 #endif
1497 
1498 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1499 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1500 
ip_vs_fwd_tag(struct ip_vs_conn * cp)1501 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1502 {
1503 	char fwd;
1504 
1505 	switch (IP_VS_FWD_METHOD(cp)) {
1506 	case IP_VS_CONN_F_MASQ:
1507 		fwd = 'M'; break;
1508 	case IP_VS_CONN_F_LOCALNODE:
1509 		fwd = 'L'; break;
1510 	case IP_VS_CONN_F_TUNNEL:
1511 		fwd = 'T'; break;
1512 	case IP_VS_CONN_F_DROUTE:
1513 		fwd = 'R'; break;
1514 	case IP_VS_CONN_F_BYPASS:
1515 		fwd = 'B'; break;
1516 	default:
1517 		fwd = '?'; break;
1518 	}
1519 	return fwd;
1520 }
1521 
1522 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1523 		    struct ip_vs_conn *cp, int dir);
1524 
1525 #ifdef CONFIG_IP_VS_IPV6
1526 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1527 		       struct ip_vs_conn *cp, int dir);
1528 #endif
1529 
1530 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1531 
ip_vs_check_diff4(__be32 old,__be32 new,__wsum oldsum)1532 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1533 {
1534 	__be32 diff[2] = { ~old, new };
1535 
1536 	return csum_partial(diff, sizeof(diff), oldsum);
1537 }
1538 
1539 #ifdef CONFIG_IP_VS_IPV6
ip_vs_check_diff16(const __be32 * old,const __be32 * new,__wsum oldsum)1540 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1541 					__wsum oldsum)
1542 {
1543 	__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1544 			    new[3],  new[2],  new[1],  new[0] };
1545 
1546 	return csum_partial(diff, sizeof(diff), oldsum);
1547 }
1548 #endif
1549 
ip_vs_check_diff2(__be16 old,__be16 new,__wsum oldsum)1550 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1551 {
1552 	__be16 diff[2] = { ~old, new };
1553 
1554 	return csum_partial(diff, sizeof(diff), oldsum);
1555 }
1556 
1557 /* Forget current conntrack (unconfirmed) and attach notrack entry */
ip_vs_notrack(struct sk_buff * skb)1558 static inline void ip_vs_notrack(struct sk_buff *skb)
1559 {
1560 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1561 	enum ip_conntrack_info ctinfo;
1562 	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1563 
1564 	if (ct) {
1565 		nf_conntrack_put(&ct->ct_general);
1566 		nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1567 	}
1568 #endif
1569 }
1570 
1571 #ifdef CONFIG_IP_VS_NFCT
1572 /* Netfilter connection tracking
1573  * (from ip_vs_nfct.c)
1574  */
ip_vs_conntrack_enabled(struct netns_ipvs * ipvs)1575 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1576 {
1577 #ifdef CONFIG_SYSCTL
1578 	return ipvs->sysctl_conntrack;
1579 #else
1580 	return 0;
1581 #endif
1582 }
1583 
1584 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1585 			    int outin);
1586 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1587 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1588 			       struct ip_vs_conn *cp, u_int8_t proto,
1589 			       const __be16 port, int from_rs);
1590 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1591 
1592 #else
1593 
ip_vs_conntrack_enabled(struct netns_ipvs * ipvs)1594 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1595 {
1596 	return 0;
1597 }
1598 
ip_vs_update_conntrack(struct sk_buff * skb,struct ip_vs_conn * cp,int outin)1599 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1600 					  struct ip_vs_conn *cp, int outin)
1601 {
1602 }
1603 
ip_vs_confirm_conntrack(struct sk_buff * skb)1604 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1605 {
1606 	return NF_ACCEPT;
1607 }
1608 
ip_vs_conn_drop_conntrack(struct ip_vs_conn * cp)1609 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1610 {
1611 }
1612 #endif /* CONFIG_IP_VS_NFCT */
1613 
1614 /* Really using conntrack? */
ip_vs_conn_uses_conntrack(struct ip_vs_conn * cp,struct sk_buff * skb)1615 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1616 					     struct sk_buff *skb)
1617 {
1618 #ifdef CONFIG_IP_VS_NFCT
1619 	enum ip_conntrack_info ctinfo;
1620 	struct nf_conn *ct;
1621 
1622 	if (!(cp->flags & IP_VS_CONN_F_NFCT))
1623 		return false;
1624 	ct = nf_ct_get(skb, &ctinfo);
1625 	if (ct)
1626 		return true;
1627 #endif
1628 	return false;
1629 }
1630 
ip_vs_register_conntrack(struct ip_vs_service * svc)1631 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1632 {
1633 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1634 	int afmask = (svc->af == AF_INET6) ? 2 : 1;
1635 	int ret = 0;
1636 
1637 	if (!(svc->conntrack_afmask & afmask)) {
1638 		ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1639 		if (ret >= 0)
1640 			svc->conntrack_afmask |= afmask;
1641 	}
1642 	return ret;
1643 #else
1644 	return 0;
1645 #endif
1646 }
1647 
ip_vs_unregister_conntrack(struct ip_vs_service * svc)1648 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1649 {
1650 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1651 	int afmask = (svc->af == AF_INET6) ? 2 : 1;
1652 
1653 	if (svc->conntrack_afmask & afmask) {
1654 		nf_ct_netns_put(svc->ipvs->net, svc->af);
1655 		svc->conntrack_afmask &= ~afmask;
1656 	}
1657 #endif
1658 }
1659 
1660 static inline int
ip_vs_dest_conn_overhead(struct ip_vs_dest * dest)1661 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1662 {
1663 	/* We think the overhead of processing active connections is 256
1664 	 * times higher than that of inactive connections in average. (This
1665 	 * 256 times might not be accurate, we will change it later) We
1666 	 * use the following formula to estimate the overhead now:
1667 	 *		  dest->activeconns*256 + dest->inactconns
1668 	 */
1669 	return (atomic_read(&dest->activeconns) << 8) +
1670 		atomic_read(&dest->inactconns);
1671 }
1672 
1673 #endif	/* _NET_IP_VS_H */
1674