1 /*
2  * IPVS         An implementation of the IP virtual server support for the
3  *              LINUX operating system.  IPVS is now implemented as a module
4  *              over the NetFilter framework. IPVS can be used to build a
5  *              high-performance and highly available server based on a
6  *              cluster of servers.
7  *
8  * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
9  *              Peter Kese <peter.kese@ijs.si>
10  *              Julian Anastasov <ja@ssi.bg>
11  *
12  *              This program is free software; you can redistribute it and/or
13  *              modify it under the terms of the GNU General Public License
14  *              as published by the Free Software Foundation; either version
15  *              2 of the License, or (at your option) any later version.
16  *
17  * Changes:
18  *
19  */
20 
21 #define KMSG_COMPONENT "IPVS"
22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23 
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/capability.h>
28 #include <linux/fs.h>
29 #include <linux/sysctl.h>
30 #include <linux/proc_fs.h>
31 #include <linux/workqueue.h>
32 #include <linux/swap.h>
33 #include <linux/seq_file.h>
34 #include <linux/slab.h>
35 
36 #include <linux/netfilter.h>
37 #include <linux/netfilter_ipv4.h>
38 #include <linux/mutex.h>
39 
40 #include <net/net_namespace.h>
41 #include <linux/nsproxy.h>
42 #include <net/ip.h>
43 #ifdef CONFIG_IP_VS_IPV6
44 #include <net/ipv6.h>
45 #include <net/ip6_route.h>
46 #endif
47 #include <net/route.h>
48 #include <net/sock.h>
49 #include <net/genetlink.h>
50 
51 #include <asm/uaccess.h>
52 
53 #include <net/ip_vs.h>
54 
55 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
56 static DEFINE_MUTEX(__ip_vs_mutex);
57 
58 /* sysctl variables */
59 
60 #ifdef CONFIG_IP_VS_DEBUG
61 static int sysctl_ip_vs_debug_level = 0;
62 
ip_vs_get_debug_level(void)63 int ip_vs_get_debug_level(void)
64 {
65 	return sysctl_ip_vs_debug_level;
66 }
67 #endif
68 
69 
70 /*  Protos */
71 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
72 
73 
74 #ifdef CONFIG_IP_VS_IPV6
75 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
__ip_vs_addr_is_local_v6(struct net * net,const struct in6_addr * addr)76 static bool __ip_vs_addr_is_local_v6(struct net *net,
77 				     const struct in6_addr *addr)
78 {
79 	struct flowi6 fl6 = {
80 		.daddr = *addr,
81 	};
82 	struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
83 	bool is_local;
84 
85 	is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
86 
87 	dst_release(dst);
88 	return is_local;
89 }
90 #endif
91 
92 #ifdef CONFIG_SYSCTL
93 /*
94  *	update_defense_level is called from keventd and from sysctl,
95  *	so it needs to protect itself from softirqs
96  */
update_defense_level(struct netns_ipvs * ipvs)97 static void update_defense_level(struct netns_ipvs *ipvs)
98 {
99 	struct sysinfo i;
100 	static int old_secure_tcp = 0;
101 	int availmem;
102 	int nomem;
103 	int to_change = -1;
104 
105 	/* we only count free and buffered memory (in pages) */
106 	si_meminfo(&i);
107 	availmem = i.freeram + i.bufferram;
108 	/* however in linux 2.5 the i.bufferram is total page cache size,
109 	   we need adjust it */
110 	/* si_swapinfo(&i); */
111 	/* availmem = availmem - (i.totalswap - i.freeswap); */
112 
113 	nomem = (availmem < ipvs->sysctl_amemthresh);
114 
115 	local_bh_disable();
116 
117 	/* drop_entry */
118 	spin_lock(&ipvs->dropentry_lock);
119 	switch (ipvs->sysctl_drop_entry) {
120 	case 0:
121 		atomic_set(&ipvs->dropentry, 0);
122 		break;
123 	case 1:
124 		if (nomem) {
125 			atomic_set(&ipvs->dropentry, 1);
126 			ipvs->sysctl_drop_entry = 2;
127 		} else {
128 			atomic_set(&ipvs->dropentry, 0);
129 		}
130 		break;
131 	case 2:
132 		if (nomem) {
133 			atomic_set(&ipvs->dropentry, 1);
134 		} else {
135 			atomic_set(&ipvs->dropentry, 0);
136 			ipvs->sysctl_drop_entry = 1;
137 		};
138 		break;
139 	case 3:
140 		atomic_set(&ipvs->dropentry, 1);
141 		break;
142 	}
143 	spin_unlock(&ipvs->dropentry_lock);
144 
145 	/* drop_packet */
146 	spin_lock(&ipvs->droppacket_lock);
147 	switch (ipvs->sysctl_drop_packet) {
148 	case 0:
149 		ipvs->drop_rate = 0;
150 		break;
151 	case 1:
152 		if (nomem) {
153 			ipvs->drop_rate = ipvs->drop_counter
154 				= ipvs->sysctl_amemthresh /
155 				(ipvs->sysctl_amemthresh-availmem);
156 			ipvs->sysctl_drop_packet = 2;
157 		} else {
158 			ipvs->drop_rate = 0;
159 		}
160 		break;
161 	case 2:
162 		if (nomem) {
163 			ipvs->drop_rate = ipvs->drop_counter
164 				= ipvs->sysctl_amemthresh /
165 				(ipvs->sysctl_amemthresh-availmem);
166 		} else {
167 			ipvs->drop_rate = 0;
168 			ipvs->sysctl_drop_packet = 1;
169 		}
170 		break;
171 	case 3:
172 		ipvs->drop_rate = ipvs->sysctl_am_droprate;
173 		break;
174 	}
175 	spin_unlock(&ipvs->droppacket_lock);
176 
177 	/* secure_tcp */
178 	spin_lock(&ipvs->securetcp_lock);
179 	switch (ipvs->sysctl_secure_tcp) {
180 	case 0:
181 		if (old_secure_tcp >= 2)
182 			to_change = 0;
183 		break;
184 	case 1:
185 		if (nomem) {
186 			if (old_secure_tcp < 2)
187 				to_change = 1;
188 			ipvs->sysctl_secure_tcp = 2;
189 		} else {
190 			if (old_secure_tcp >= 2)
191 				to_change = 0;
192 		}
193 		break;
194 	case 2:
195 		if (nomem) {
196 			if (old_secure_tcp < 2)
197 				to_change = 1;
198 		} else {
199 			if (old_secure_tcp >= 2)
200 				to_change = 0;
201 			ipvs->sysctl_secure_tcp = 1;
202 		}
203 		break;
204 	case 3:
205 		if (old_secure_tcp < 2)
206 			to_change = 1;
207 		break;
208 	}
209 	old_secure_tcp = ipvs->sysctl_secure_tcp;
210 	if (to_change >= 0)
211 		ip_vs_protocol_timeout_change(ipvs,
212 					      ipvs->sysctl_secure_tcp > 1);
213 	spin_unlock(&ipvs->securetcp_lock);
214 
215 	local_bh_enable();
216 }
217 
218 
219 /*
220  *	Timer for checking the defense
221  */
222 #define DEFENSE_TIMER_PERIOD	1*HZ
223 
defense_work_handler(struct work_struct * work)224 static void defense_work_handler(struct work_struct *work)
225 {
226 	struct netns_ipvs *ipvs =
227 		container_of(work, struct netns_ipvs, defense_work.work);
228 
229 	update_defense_level(ipvs);
230 	if (atomic_read(&ipvs->dropentry))
231 		ip_vs_random_dropentry(ipvs->net);
232 	schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
233 }
234 #endif
235 
236 int
ip_vs_use_count_inc(void)237 ip_vs_use_count_inc(void)
238 {
239 	return try_module_get(THIS_MODULE);
240 }
241 
242 void
ip_vs_use_count_dec(void)243 ip_vs_use_count_dec(void)
244 {
245 	module_put(THIS_MODULE);
246 }
247 
248 
249 /*
250  *	Hash table: for virtual service lookups
251  */
252 #define IP_VS_SVC_TAB_BITS 8
253 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
254 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
255 
256 /* the service table hashed by <protocol, addr, port> */
257 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
258 /* the service table hashed by fwmark */
259 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
260 
261 
262 /*
263  *	Returns hash value for virtual service
264  */
265 static inline unsigned int
ip_vs_svc_hashkey(struct net * net,int af,unsigned int proto,const union nf_inet_addr * addr,__be16 port)266 ip_vs_svc_hashkey(struct net *net, int af, unsigned int proto,
267 		  const union nf_inet_addr *addr, __be16 port)
268 {
269 	register unsigned int porth = ntohs(port);
270 	__be32 addr_fold = addr->ip;
271 	__u32 ahash;
272 
273 #ifdef CONFIG_IP_VS_IPV6
274 	if (af == AF_INET6)
275 		addr_fold = addr->ip6[0]^addr->ip6[1]^
276 			    addr->ip6[2]^addr->ip6[3];
277 #endif
278 	ahash = ntohl(addr_fold);
279 	ahash ^= ((size_t) net >> 8);
280 
281 	return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
282 	       IP_VS_SVC_TAB_MASK;
283 }
284 
285 /*
286  *	Returns hash value of fwmark for virtual service lookup
287  */
ip_vs_svc_fwm_hashkey(struct net * net,__u32 fwmark)288 static inline unsigned int ip_vs_svc_fwm_hashkey(struct net *net, __u32 fwmark)
289 {
290 	return (((size_t)net>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
291 }
292 
293 /*
294  *	Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
295  *	or in the ip_vs_svc_fwm_table by fwmark.
296  *	Should be called with locked tables.
297  */
ip_vs_svc_hash(struct ip_vs_service * svc)298 static int ip_vs_svc_hash(struct ip_vs_service *svc)
299 {
300 	unsigned int hash;
301 
302 	if (svc->flags & IP_VS_SVC_F_HASHED) {
303 		pr_err("%s(): request for already hashed, called from %pF\n",
304 		       __func__, __builtin_return_address(0));
305 		return 0;
306 	}
307 
308 	if (svc->fwmark == 0) {
309 		/*
310 		 *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
311 		 */
312 		hash = ip_vs_svc_hashkey(svc->net, svc->af, svc->protocol,
313 					 &svc->addr, svc->port);
314 		hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
315 	} else {
316 		/*
317 		 *  Hash it by fwmark in svc_fwm_table
318 		 */
319 		hash = ip_vs_svc_fwm_hashkey(svc->net, svc->fwmark);
320 		hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
321 	}
322 
323 	svc->flags |= IP_VS_SVC_F_HASHED;
324 	/* increase its refcnt because it is referenced by the svc table */
325 	atomic_inc(&svc->refcnt);
326 	return 1;
327 }
328 
329 
330 /*
331  *	Unhashes a service from svc_table / svc_fwm_table.
332  *	Should be called with locked tables.
333  */
ip_vs_svc_unhash(struct ip_vs_service * svc)334 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
335 {
336 	if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
337 		pr_err("%s(): request for unhash flagged, called from %pF\n",
338 		       __func__, __builtin_return_address(0));
339 		return 0;
340 	}
341 
342 	if (svc->fwmark == 0) {
343 		/* Remove it from the svc_table table */
344 		hlist_del_rcu(&svc->s_list);
345 	} else {
346 		/* Remove it from the svc_fwm_table table */
347 		hlist_del_rcu(&svc->f_list);
348 	}
349 
350 	svc->flags &= ~IP_VS_SVC_F_HASHED;
351 	atomic_dec(&svc->refcnt);
352 	return 1;
353 }
354 
355 
356 /*
357  *	Get service by {netns, proto,addr,port} in the service table.
358  */
359 static inline struct ip_vs_service *
__ip_vs_service_find(struct net * net,int af,__u16 protocol,const union nf_inet_addr * vaddr,__be16 vport)360 __ip_vs_service_find(struct net *net, int af, __u16 protocol,
361 		     const union nf_inet_addr *vaddr, __be16 vport)
362 {
363 	unsigned int hash;
364 	struct ip_vs_service *svc;
365 
366 	/* Check for "full" addressed entries */
367 	hash = ip_vs_svc_hashkey(net, af, protocol, vaddr, vport);
368 
369 	hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
370 		if ((svc->af == af)
371 		    && ip_vs_addr_equal(af, &svc->addr, vaddr)
372 		    && (svc->port == vport)
373 		    && (svc->protocol == protocol)
374 		    && net_eq(svc->net, net)) {
375 			/* HIT */
376 			return svc;
377 		}
378 	}
379 
380 	return NULL;
381 }
382 
383 
384 /*
385  *	Get service by {fwmark} in the service table.
386  */
387 static inline struct ip_vs_service *
__ip_vs_svc_fwm_find(struct net * net,int af,__u32 fwmark)388 __ip_vs_svc_fwm_find(struct net *net, int af, __u32 fwmark)
389 {
390 	unsigned int hash;
391 	struct ip_vs_service *svc;
392 
393 	/* Check for fwmark addressed entries */
394 	hash = ip_vs_svc_fwm_hashkey(net, fwmark);
395 
396 	hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
397 		if (svc->fwmark == fwmark && svc->af == af
398 		    && net_eq(svc->net, net)) {
399 			/* HIT */
400 			return svc;
401 		}
402 	}
403 
404 	return NULL;
405 }
406 
407 /* Find service, called under RCU lock */
408 struct ip_vs_service *
ip_vs_service_find(struct net * net,int af,__u32 fwmark,__u16 protocol,const union nf_inet_addr * vaddr,__be16 vport)409 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
410 		   const union nf_inet_addr *vaddr, __be16 vport)
411 {
412 	struct ip_vs_service *svc;
413 	struct netns_ipvs *ipvs = net_ipvs(net);
414 
415 	/*
416 	 *	Check the table hashed by fwmark first
417 	 */
418 	if (fwmark) {
419 		svc = __ip_vs_svc_fwm_find(net, af, fwmark);
420 		if (svc)
421 			goto out;
422 	}
423 
424 	/*
425 	 *	Check the table hashed by <protocol,addr,port>
426 	 *	for "full" addressed entries
427 	 */
428 	svc = __ip_vs_service_find(net, af, protocol, vaddr, vport);
429 
430 	if (svc == NULL
431 	    && protocol == IPPROTO_TCP
432 	    && atomic_read(&ipvs->ftpsvc_counter)
433 	    && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
434 		/*
435 		 * Check if ftp service entry exists, the packet
436 		 * might belong to FTP data connections.
437 		 */
438 		svc = __ip_vs_service_find(net, af, protocol, vaddr, FTPPORT);
439 	}
440 
441 	if (svc == NULL
442 	    && atomic_read(&ipvs->nullsvc_counter)) {
443 		/*
444 		 * Check if the catch-all port (port zero) exists
445 		 */
446 		svc = __ip_vs_service_find(net, af, protocol, vaddr, 0);
447 	}
448 
449   out:
450 	IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
451 		      fwmark, ip_vs_proto_name(protocol),
452 		      IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
453 		      svc ? "hit" : "not hit");
454 
455 	return svc;
456 }
457 
458 
459 static inline void
__ip_vs_bind_svc(struct ip_vs_dest * dest,struct ip_vs_service * svc)460 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
461 {
462 	atomic_inc(&svc->refcnt);
463 	rcu_assign_pointer(dest->svc, svc);
464 }
465 
ip_vs_service_free(struct ip_vs_service * svc)466 static void ip_vs_service_free(struct ip_vs_service *svc)
467 {
468 	free_percpu(svc->stats.cpustats);
469 	kfree(svc);
470 }
471 
ip_vs_service_rcu_free(struct rcu_head * head)472 static void ip_vs_service_rcu_free(struct rcu_head *head)
473 {
474 	struct ip_vs_service *svc;
475 
476 	svc = container_of(head, struct ip_vs_service, rcu_head);
477 	ip_vs_service_free(svc);
478 }
479 
__ip_vs_svc_put(struct ip_vs_service * svc,bool do_delay)480 static void __ip_vs_svc_put(struct ip_vs_service *svc, bool do_delay)
481 {
482 	if (atomic_dec_and_test(&svc->refcnt)) {
483 		IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
484 			      svc->fwmark,
485 			      IP_VS_DBG_ADDR(svc->af, &svc->addr),
486 			      ntohs(svc->port));
487 		if (do_delay)
488 			call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
489 		else
490 			ip_vs_service_free(svc);
491 	}
492 }
493 
494 
495 /*
496  *	Returns hash value for real service
497  */
ip_vs_rs_hashkey(int af,const union nf_inet_addr * addr,__be16 port)498 static inline unsigned int ip_vs_rs_hashkey(int af,
499 					    const union nf_inet_addr *addr,
500 					    __be16 port)
501 {
502 	register unsigned int porth = ntohs(port);
503 	__be32 addr_fold = addr->ip;
504 
505 #ifdef CONFIG_IP_VS_IPV6
506 	if (af == AF_INET6)
507 		addr_fold = addr->ip6[0]^addr->ip6[1]^
508 			    addr->ip6[2]^addr->ip6[3];
509 #endif
510 
511 	return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
512 		& IP_VS_RTAB_MASK;
513 }
514 
515 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
ip_vs_rs_hash(struct netns_ipvs * ipvs,struct ip_vs_dest * dest)516 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
517 {
518 	unsigned int hash;
519 
520 	if (dest->in_rs_table)
521 		return;
522 
523 	/*
524 	 *	Hash by proto,addr,port,
525 	 *	which are the parameters of the real service.
526 	 */
527 	hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
528 
529 	hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
530 	dest->in_rs_table = 1;
531 }
532 
533 /* Unhash ip_vs_dest from rs_table. */
ip_vs_rs_unhash(struct ip_vs_dest * dest)534 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
535 {
536 	/*
537 	 * Remove it from the rs_table table.
538 	 */
539 	if (dest->in_rs_table) {
540 		hlist_del_rcu(&dest->d_list);
541 		dest->in_rs_table = 0;
542 	}
543 }
544 
545 /* Check if real service by <proto,addr,port> is present */
ip_vs_has_real_service(struct net * net,int af,__u16 protocol,const union nf_inet_addr * daddr,__be16 dport)546 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
547 			    const union nf_inet_addr *daddr, __be16 dport)
548 {
549 	struct netns_ipvs *ipvs = net_ipvs(net);
550 	unsigned int hash;
551 	struct ip_vs_dest *dest;
552 
553 	/* Check for "full" addressed entries */
554 	hash = ip_vs_rs_hashkey(af, daddr, dport);
555 
556 	rcu_read_lock();
557 	hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
558 		if (dest->port == dport &&
559 		    dest->af == af &&
560 		    ip_vs_addr_equal(af, &dest->addr, daddr) &&
561 		    (dest->protocol == protocol || dest->vfwmark)) {
562 			/* HIT */
563 			rcu_read_unlock();
564 			return true;
565 		}
566 	}
567 	rcu_read_unlock();
568 
569 	return false;
570 }
571 
572 /* Lookup destination by {addr,port} in the given service
573  * Called under RCU lock.
574  */
575 static struct ip_vs_dest *
ip_vs_lookup_dest(struct ip_vs_service * svc,int dest_af,const union nf_inet_addr * daddr,__be16 dport)576 ip_vs_lookup_dest(struct ip_vs_service *svc, int dest_af,
577 		  const union nf_inet_addr *daddr, __be16 dport)
578 {
579 	struct ip_vs_dest *dest;
580 
581 	/*
582 	 * Find the destination for the given service
583 	 */
584 	list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
585 		if ((dest->af == dest_af) &&
586 		    ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
587 		    (dest->port == dport)) {
588 			/* HIT */
589 			return dest;
590 		}
591 	}
592 
593 	return NULL;
594 }
595 
596 /*
597  * Find destination by {daddr,dport,vaddr,protocol}
598  * Created to be used in ip_vs_process_message() in
599  * the backup synchronization daemon. It finds the
600  * destination to be bound to the received connection
601  * on the backup.
602  * Called under RCU lock, no refcnt is returned.
603  */
ip_vs_find_dest(struct net * net,int svc_af,int dest_af,const union nf_inet_addr * daddr,__be16 dport,const union nf_inet_addr * vaddr,__be16 vport,__u16 protocol,__u32 fwmark,__u32 flags)604 struct ip_vs_dest *ip_vs_find_dest(struct net  *net, int svc_af, int dest_af,
605 				   const union nf_inet_addr *daddr,
606 				   __be16 dport,
607 				   const union nf_inet_addr *vaddr,
608 				   __be16 vport, __u16 protocol, __u32 fwmark,
609 				   __u32 flags)
610 {
611 	struct ip_vs_dest *dest;
612 	struct ip_vs_service *svc;
613 	__be16 port = dport;
614 
615 	svc = ip_vs_service_find(net, svc_af, fwmark, protocol, vaddr, vport);
616 	if (!svc)
617 		return NULL;
618 	if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
619 		port = 0;
620 	dest = ip_vs_lookup_dest(svc, dest_af, daddr, port);
621 	if (!dest)
622 		dest = ip_vs_lookup_dest(svc, dest_af, daddr, port ^ dport);
623 	return dest;
624 }
625 
ip_vs_dest_dst_rcu_free(struct rcu_head * head)626 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
627 {
628 	struct ip_vs_dest_dst *dest_dst = container_of(head,
629 						       struct ip_vs_dest_dst,
630 						       rcu_head);
631 
632 	dst_release(dest_dst->dst_cache);
633 	kfree(dest_dst);
634 }
635 
636 /* Release dest_dst and dst_cache for dest in user context */
__ip_vs_dst_cache_reset(struct ip_vs_dest * dest)637 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
638 {
639 	struct ip_vs_dest_dst *old;
640 
641 	old = rcu_dereference_protected(dest->dest_dst, 1);
642 	if (old) {
643 		RCU_INIT_POINTER(dest->dest_dst, NULL);
644 		call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
645 	}
646 }
647 
648 /*
649  *  Lookup dest by {svc,addr,port} in the destination trash.
650  *  The destination trash is used to hold the destinations that are removed
651  *  from the service table but are still referenced by some conn entries.
652  *  The reason to add the destination trash is when the dest is temporary
653  *  down (either by administrator or by monitor program), the dest can be
654  *  picked back from the trash, the remaining connections to the dest can
655  *  continue, and the counting information of the dest is also useful for
656  *  scheduling.
657  */
658 static struct ip_vs_dest *
ip_vs_trash_get_dest(struct ip_vs_service * svc,int dest_af,const union nf_inet_addr * daddr,__be16 dport)659 ip_vs_trash_get_dest(struct ip_vs_service *svc, int dest_af,
660 		     const union nf_inet_addr *daddr, __be16 dport)
661 {
662 	struct ip_vs_dest *dest;
663 	struct netns_ipvs *ipvs = net_ipvs(svc->net);
664 
665 	/*
666 	 * Find the destination in trash
667 	 */
668 	spin_lock_bh(&ipvs->dest_trash_lock);
669 	list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
670 		IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
671 			      "dest->refcnt=%d\n",
672 			      dest->vfwmark,
673 			      IP_VS_DBG_ADDR(dest->af, &dest->addr),
674 			      ntohs(dest->port),
675 			      atomic_read(&dest->refcnt));
676 		if (dest->af == dest_af &&
677 		    ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
678 		    dest->port == dport &&
679 		    dest->vfwmark == svc->fwmark &&
680 		    dest->protocol == svc->protocol &&
681 		    (svc->fwmark ||
682 		     (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
683 		      dest->vport == svc->port))) {
684 			/* HIT */
685 			list_del(&dest->t_list);
686 			ip_vs_dest_hold(dest);
687 			goto out;
688 		}
689 	}
690 
691 	dest = NULL;
692 
693 out:
694 	spin_unlock_bh(&ipvs->dest_trash_lock);
695 
696 	return dest;
697 }
698 
ip_vs_dest_free(struct ip_vs_dest * dest)699 static void ip_vs_dest_free(struct ip_vs_dest *dest)
700 {
701 	struct ip_vs_service *svc = rcu_dereference_protected(dest->svc, 1);
702 
703 	__ip_vs_dst_cache_reset(dest);
704 	__ip_vs_svc_put(svc, false);
705 	free_percpu(dest->stats.cpustats);
706 	ip_vs_dest_put_and_free(dest);
707 }
708 
709 /*
710  *  Clean up all the destinations in the trash
711  *  Called by the ip_vs_control_cleanup()
712  *
713  *  When the ip_vs_control_clearup is activated by ipvs module exit,
714  *  the service tables must have been flushed and all the connections
715  *  are expired, and the refcnt of each destination in the trash must
716  *  be 0, so we simply release them here.
717  */
ip_vs_trash_cleanup(struct net * net)718 static void ip_vs_trash_cleanup(struct net *net)
719 {
720 	struct ip_vs_dest *dest, *nxt;
721 	struct netns_ipvs *ipvs = net_ipvs(net);
722 
723 	del_timer_sync(&ipvs->dest_trash_timer);
724 	/* No need to use dest_trash_lock */
725 	list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
726 		list_del(&dest->t_list);
727 		ip_vs_dest_free(dest);
728 	}
729 }
730 
731 static void
ip_vs_copy_stats(struct ip_vs_kstats * dst,struct ip_vs_stats * src)732 ip_vs_copy_stats(struct ip_vs_kstats *dst, struct ip_vs_stats *src)
733 {
734 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->kstats.c - src->kstats0.c
735 
736 	spin_lock_bh(&src->lock);
737 
738 	IP_VS_SHOW_STATS_COUNTER(conns);
739 	IP_VS_SHOW_STATS_COUNTER(inpkts);
740 	IP_VS_SHOW_STATS_COUNTER(outpkts);
741 	IP_VS_SHOW_STATS_COUNTER(inbytes);
742 	IP_VS_SHOW_STATS_COUNTER(outbytes);
743 
744 	ip_vs_read_estimator(dst, src);
745 
746 	spin_unlock_bh(&src->lock);
747 }
748 
749 static void
ip_vs_export_stats_user(struct ip_vs_stats_user * dst,struct ip_vs_kstats * src)750 ip_vs_export_stats_user(struct ip_vs_stats_user *dst, struct ip_vs_kstats *src)
751 {
752 	dst->conns = (u32)src->conns;
753 	dst->inpkts = (u32)src->inpkts;
754 	dst->outpkts = (u32)src->outpkts;
755 	dst->inbytes = src->inbytes;
756 	dst->outbytes = src->outbytes;
757 	dst->cps = (u32)src->cps;
758 	dst->inpps = (u32)src->inpps;
759 	dst->outpps = (u32)src->outpps;
760 	dst->inbps = (u32)src->inbps;
761 	dst->outbps = (u32)src->outbps;
762 }
763 
764 static void
ip_vs_zero_stats(struct ip_vs_stats * stats)765 ip_vs_zero_stats(struct ip_vs_stats *stats)
766 {
767 	spin_lock_bh(&stats->lock);
768 
769 	/* get current counters as zero point, rates are zeroed */
770 
771 #define IP_VS_ZERO_STATS_COUNTER(c) stats->kstats0.c = stats->kstats.c
772 
773 	IP_VS_ZERO_STATS_COUNTER(conns);
774 	IP_VS_ZERO_STATS_COUNTER(inpkts);
775 	IP_VS_ZERO_STATS_COUNTER(outpkts);
776 	IP_VS_ZERO_STATS_COUNTER(inbytes);
777 	IP_VS_ZERO_STATS_COUNTER(outbytes);
778 
779 	ip_vs_zero_estimator(stats);
780 
781 	spin_unlock_bh(&stats->lock);
782 }
783 
784 /*
785  *	Update a destination in the given service
786  */
787 static void
__ip_vs_update_dest(struct ip_vs_service * svc,struct ip_vs_dest * dest,struct ip_vs_dest_user_kern * udest,int add)788 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
789 		    struct ip_vs_dest_user_kern *udest, int add)
790 {
791 	struct netns_ipvs *ipvs = net_ipvs(svc->net);
792 	struct ip_vs_service *old_svc;
793 	struct ip_vs_scheduler *sched;
794 	int conn_flags;
795 
796 	/* We cannot modify an address and change the address family */
797 	BUG_ON(!add && udest->af != dest->af);
798 
799 	if (add && udest->af != svc->af)
800 		ipvs->mixed_address_family_dests++;
801 
802 	/* set the weight and the flags */
803 	atomic_set(&dest->weight, udest->weight);
804 	conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
805 	conn_flags |= IP_VS_CONN_F_INACTIVE;
806 
807 	/* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
808 	if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
809 		conn_flags |= IP_VS_CONN_F_NOOUTPUT;
810 	} else {
811 		/*
812 		 *    Put the real service in rs_table if not present.
813 		 *    For now only for NAT!
814 		 */
815 		ip_vs_rs_hash(ipvs, dest);
816 	}
817 	atomic_set(&dest->conn_flags, conn_flags);
818 
819 	/* bind the service */
820 	old_svc = rcu_dereference_protected(dest->svc, 1);
821 	if (!old_svc) {
822 		__ip_vs_bind_svc(dest, svc);
823 	} else {
824 		if (old_svc != svc) {
825 			ip_vs_zero_stats(&dest->stats);
826 			__ip_vs_bind_svc(dest, svc);
827 			__ip_vs_svc_put(old_svc, true);
828 		}
829 	}
830 
831 	/* set the dest status flags */
832 	dest->flags |= IP_VS_DEST_F_AVAILABLE;
833 
834 	if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
835 		dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
836 	dest->u_threshold = udest->u_threshold;
837 	dest->l_threshold = udest->l_threshold;
838 
839 	dest->af = udest->af;
840 
841 	spin_lock_bh(&dest->dst_lock);
842 	__ip_vs_dst_cache_reset(dest);
843 	spin_unlock_bh(&dest->dst_lock);
844 
845 	if (add) {
846 		ip_vs_start_estimator(svc->net, &dest->stats);
847 		list_add_rcu(&dest->n_list, &svc->destinations);
848 		svc->num_dests++;
849 		sched = rcu_dereference_protected(svc->scheduler, 1);
850 		if (sched && sched->add_dest)
851 			sched->add_dest(svc, dest);
852 	} else {
853 		sched = rcu_dereference_protected(svc->scheduler, 1);
854 		if (sched && sched->upd_dest)
855 			sched->upd_dest(svc, dest);
856 	}
857 }
858 
859 
860 /*
861  *	Create a destination for the given service
862  */
863 static int
ip_vs_new_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest,struct ip_vs_dest ** dest_p)864 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
865 	       struct ip_vs_dest **dest_p)
866 {
867 	struct ip_vs_dest *dest;
868 	unsigned int atype, i;
869 
870 	EnterFunction(2);
871 
872 #ifdef CONFIG_IP_VS_IPV6
873 	if (udest->af == AF_INET6) {
874 		atype = ipv6_addr_type(&udest->addr.in6);
875 		if ((!(atype & IPV6_ADDR_UNICAST) ||
876 			atype & IPV6_ADDR_LINKLOCAL) &&
877 			!__ip_vs_addr_is_local_v6(svc->net, &udest->addr.in6))
878 			return -EINVAL;
879 	} else
880 #endif
881 	{
882 		atype = inet_addr_type(svc->net, udest->addr.ip);
883 		if (atype != RTN_LOCAL && atype != RTN_UNICAST)
884 			return -EINVAL;
885 	}
886 
887 	dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
888 	if (dest == NULL)
889 		return -ENOMEM;
890 
891 	dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
892 	if (!dest->stats.cpustats)
893 		goto err_alloc;
894 
895 	for_each_possible_cpu(i) {
896 		struct ip_vs_cpu_stats *ip_vs_dest_stats;
897 		ip_vs_dest_stats = per_cpu_ptr(dest->stats.cpustats, i);
898 		u64_stats_init(&ip_vs_dest_stats->syncp);
899 	}
900 
901 	dest->af = udest->af;
902 	dest->protocol = svc->protocol;
903 	dest->vaddr = svc->addr;
904 	dest->vport = svc->port;
905 	dest->vfwmark = svc->fwmark;
906 	ip_vs_addr_copy(udest->af, &dest->addr, &udest->addr);
907 	dest->port = udest->port;
908 
909 	atomic_set(&dest->activeconns, 0);
910 	atomic_set(&dest->inactconns, 0);
911 	atomic_set(&dest->persistconns, 0);
912 	atomic_set(&dest->refcnt, 1);
913 
914 	INIT_HLIST_NODE(&dest->d_list);
915 	spin_lock_init(&dest->dst_lock);
916 	spin_lock_init(&dest->stats.lock);
917 	__ip_vs_update_dest(svc, dest, udest, 1);
918 
919 	*dest_p = dest;
920 
921 	LeaveFunction(2);
922 	return 0;
923 
924 err_alloc:
925 	kfree(dest);
926 	return -ENOMEM;
927 }
928 
929 
930 /*
931  *	Add a destination into an existing service
932  */
933 static int
ip_vs_add_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)934 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
935 {
936 	struct ip_vs_dest *dest;
937 	union nf_inet_addr daddr;
938 	__be16 dport = udest->port;
939 	int ret;
940 
941 	EnterFunction(2);
942 
943 	if (udest->weight < 0) {
944 		pr_err("%s(): server weight less than zero\n", __func__);
945 		return -ERANGE;
946 	}
947 
948 	if (udest->l_threshold > udest->u_threshold) {
949 		pr_err("%s(): lower threshold is higher than upper threshold\n",
950 			__func__);
951 		return -ERANGE;
952 	}
953 
954 	ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
955 
956 	/* We use function that requires RCU lock */
957 	rcu_read_lock();
958 	dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
959 	rcu_read_unlock();
960 
961 	if (dest != NULL) {
962 		IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
963 		return -EEXIST;
964 	}
965 
966 	/*
967 	 * Check if the dest already exists in the trash and
968 	 * is from the same service
969 	 */
970 	dest = ip_vs_trash_get_dest(svc, udest->af, &daddr, dport);
971 
972 	if (dest != NULL) {
973 		IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
974 			      "dest->refcnt=%d, service %u/%s:%u\n",
975 			      IP_VS_DBG_ADDR(udest->af, &daddr), ntohs(dport),
976 			      atomic_read(&dest->refcnt),
977 			      dest->vfwmark,
978 			      IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
979 			      ntohs(dest->vport));
980 
981 		__ip_vs_update_dest(svc, dest, udest, 1);
982 		ret = 0;
983 	} else {
984 		/*
985 		 * Allocate and initialize the dest structure
986 		 */
987 		ret = ip_vs_new_dest(svc, udest, &dest);
988 	}
989 	LeaveFunction(2);
990 
991 	return ret;
992 }
993 
994 
995 /*
996  *	Edit a destination in the given service
997  */
998 static int
ip_vs_edit_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)999 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1000 {
1001 	struct ip_vs_dest *dest;
1002 	union nf_inet_addr daddr;
1003 	__be16 dport = udest->port;
1004 
1005 	EnterFunction(2);
1006 
1007 	if (udest->weight < 0) {
1008 		pr_err("%s(): server weight less than zero\n", __func__);
1009 		return -ERANGE;
1010 	}
1011 
1012 	if (udest->l_threshold > udest->u_threshold) {
1013 		pr_err("%s(): lower threshold is higher than upper threshold\n",
1014 			__func__);
1015 		return -ERANGE;
1016 	}
1017 
1018 	ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1019 
1020 	/* We use function that requires RCU lock */
1021 	rcu_read_lock();
1022 	dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1023 	rcu_read_unlock();
1024 
1025 	if (dest == NULL) {
1026 		IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1027 		return -ENOENT;
1028 	}
1029 
1030 	__ip_vs_update_dest(svc, dest, udest, 0);
1031 	LeaveFunction(2);
1032 
1033 	return 0;
1034 }
1035 
1036 /*
1037  *	Delete a destination (must be already unlinked from the service)
1038  */
__ip_vs_del_dest(struct net * net,struct ip_vs_dest * dest,bool cleanup)1039 static void __ip_vs_del_dest(struct net *net, struct ip_vs_dest *dest,
1040 			     bool cleanup)
1041 {
1042 	struct netns_ipvs *ipvs = net_ipvs(net);
1043 
1044 	ip_vs_stop_estimator(net, &dest->stats);
1045 
1046 	/*
1047 	 *  Remove it from the d-linked list with the real services.
1048 	 */
1049 	ip_vs_rs_unhash(dest);
1050 
1051 	spin_lock_bh(&ipvs->dest_trash_lock);
1052 	IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1053 		      IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1054 		      atomic_read(&dest->refcnt));
1055 	if (list_empty(&ipvs->dest_trash) && !cleanup)
1056 		mod_timer(&ipvs->dest_trash_timer,
1057 			  jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1058 	/* dest lives in trash without reference */
1059 	list_add(&dest->t_list, &ipvs->dest_trash);
1060 	dest->idle_start = 0;
1061 	spin_unlock_bh(&ipvs->dest_trash_lock);
1062 	ip_vs_dest_put(dest);
1063 }
1064 
1065 
1066 /*
1067  *	Unlink a destination from the given service
1068  */
__ip_vs_unlink_dest(struct ip_vs_service * svc,struct ip_vs_dest * dest,int svcupd)1069 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1070 				struct ip_vs_dest *dest,
1071 				int svcupd)
1072 {
1073 	dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1074 
1075 	/*
1076 	 *  Remove it from the d-linked destination list.
1077 	 */
1078 	list_del_rcu(&dest->n_list);
1079 	svc->num_dests--;
1080 
1081 	if (dest->af != svc->af)
1082 		net_ipvs(svc->net)->mixed_address_family_dests--;
1083 
1084 	if (svcupd) {
1085 		struct ip_vs_scheduler *sched;
1086 
1087 		sched = rcu_dereference_protected(svc->scheduler, 1);
1088 		if (sched && sched->del_dest)
1089 			sched->del_dest(svc, dest);
1090 	}
1091 }
1092 
1093 
1094 /*
1095  *	Delete a destination server in the given service
1096  */
1097 static int
ip_vs_del_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)1098 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1099 {
1100 	struct ip_vs_dest *dest;
1101 	__be16 dport = udest->port;
1102 
1103 	EnterFunction(2);
1104 
1105 	/* We use function that requires RCU lock */
1106 	rcu_read_lock();
1107 	dest = ip_vs_lookup_dest(svc, udest->af, &udest->addr, dport);
1108 	rcu_read_unlock();
1109 
1110 	if (dest == NULL) {
1111 		IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1112 		return -ENOENT;
1113 	}
1114 
1115 	/*
1116 	 *	Unlink dest from the service
1117 	 */
1118 	__ip_vs_unlink_dest(svc, dest, 1);
1119 
1120 	/*
1121 	 *	Delete the destination
1122 	 */
1123 	__ip_vs_del_dest(svc->net, dest, false);
1124 
1125 	LeaveFunction(2);
1126 
1127 	return 0;
1128 }
1129 
ip_vs_dest_trash_expire(unsigned long data)1130 static void ip_vs_dest_trash_expire(unsigned long data)
1131 {
1132 	struct net *net = (struct net *) data;
1133 	struct netns_ipvs *ipvs = net_ipvs(net);
1134 	struct ip_vs_dest *dest, *next;
1135 	unsigned long now = jiffies;
1136 
1137 	spin_lock(&ipvs->dest_trash_lock);
1138 	list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1139 		if (atomic_read(&dest->refcnt) > 0)
1140 			continue;
1141 		if (dest->idle_start) {
1142 			if (time_before(now, dest->idle_start +
1143 					     IP_VS_DEST_TRASH_PERIOD))
1144 				continue;
1145 		} else {
1146 			dest->idle_start = max(1UL, now);
1147 			continue;
1148 		}
1149 		IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1150 			      dest->vfwmark,
1151 			      IP_VS_DBG_ADDR(dest->af, &dest->addr),
1152 			      ntohs(dest->port));
1153 		list_del(&dest->t_list);
1154 		ip_vs_dest_free(dest);
1155 	}
1156 	if (!list_empty(&ipvs->dest_trash))
1157 		mod_timer(&ipvs->dest_trash_timer,
1158 			  jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1159 	spin_unlock(&ipvs->dest_trash_lock);
1160 }
1161 
1162 /*
1163  *	Add a service into the service hash table
1164  */
1165 static int
ip_vs_add_service(struct net * net,struct ip_vs_service_user_kern * u,struct ip_vs_service ** svc_p)1166 ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
1167 		  struct ip_vs_service **svc_p)
1168 {
1169 	int ret = 0, i;
1170 	struct ip_vs_scheduler *sched = NULL;
1171 	struct ip_vs_pe *pe = NULL;
1172 	struct ip_vs_service *svc = NULL;
1173 	struct netns_ipvs *ipvs = net_ipvs(net);
1174 
1175 	/* increase the module use count */
1176 	ip_vs_use_count_inc();
1177 
1178 	/* Lookup the scheduler by 'u->sched_name' */
1179 	if (strcmp(u->sched_name, "none")) {
1180 		sched = ip_vs_scheduler_get(u->sched_name);
1181 		if (!sched) {
1182 			pr_info("Scheduler module ip_vs_%s not found\n",
1183 				u->sched_name);
1184 			ret = -ENOENT;
1185 			goto out_err;
1186 		}
1187 	}
1188 
1189 	if (u->pe_name && *u->pe_name) {
1190 		pe = ip_vs_pe_getbyname(u->pe_name);
1191 		if (pe == NULL) {
1192 			pr_info("persistence engine module ip_vs_pe_%s "
1193 				"not found\n", u->pe_name);
1194 			ret = -ENOENT;
1195 			goto out_err;
1196 		}
1197 	}
1198 
1199 #ifdef CONFIG_IP_VS_IPV6
1200 	if (u->af == AF_INET6) {
1201 		__u32 plen = (__force __u32) u->netmask;
1202 
1203 		if (plen < 1 || plen > 128) {
1204 			ret = -EINVAL;
1205 			goto out_err;
1206 		}
1207 	}
1208 #endif
1209 
1210 	svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1211 	if (svc == NULL) {
1212 		IP_VS_DBG(1, "%s(): no memory\n", __func__);
1213 		ret = -ENOMEM;
1214 		goto out_err;
1215 	}
1216 	svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1217 	if (!svc->stats.cpustats) {
1218 		ret = -ENOMEM;
1219 		goto out_err;
1220 	}
1221 
1222 	for_each_possible_cpu(i) {
1223 		struct ip_vs_cpu_stats *ip_vs_stats;
1224 		ip_vs_stats = per_cpu_ptr(svc->stats.cpustats, i);
1225 		u64_stats_init(&ip_vs_stats->syncp);
1226 	}
1227 
1228 
1229 	/* I'm the first user of the service */
1230 	atomic_set(&svc->refcnt, 0);
1231 
1232 	svc->af = u->af;
1233 	svc->protocol = u->protocol;
1234 	ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1235 	svc->port = u->port;
1236 	svc->fwmark = u->fwmark;
1237 	svc->flags = u->flags;
1238 	svc->timeout = u->timeout * HZ;
1239 	svc->netmask = u->netmask;
1240 	svc->net = net;
1241 
1242 	INIT_LIST_HEAD(&svc->destinations);
1243 	spin_lock_init(&svc->sched_lock);
1244 	spin_lock_init(&svc->stats.lock);
1245 
1246 	/* Bind the scheduler */
1247 	if (sched) {
1248 		ret = ip_vs_bind_scheduler(svc, sched);
1249 		if (ret)
1250 			goto out_err;
1251 		sched = NULL;
1252 	}
1253 
1254 	/* Bind the ct retriever */
1255 	RCU_INIT_POINTER(svc->pe, pe);
1256 	pe = NULL;
1257 
1258 	/* Update the virtual service counters */
1259 	if (svc->port == FTPPORT)
1260 		atomic_inc(&ipvs->ftpsvc_counter);
1261 	else if (svc->port == 0)
1262 		atomic_inc(&ipvs->nullsvc_counter);
1263 
1264 	ip_vs_start_estimator(net, &svc->stats);
1265 
1266 	/* Count only IPv4 services for old get/setsockopt interface */
1267 	if (svc->af == AF_INET)
1268 		ipvs->num_services++;
1269 
1270 	/* Hash the service into the service table */
1271 	ip_vs_svc_hash(svc);
1272 
1273 	*svc_p = svc;
1274 	/* Now there is a service - full throttle */
1275 	ipvs->enable = 1;
1276 	return 0;
1277 
1278 
1279  out_err:
1280 	if (svc != NULL) {
1281 		ip_vs_unbind_scheduler(svc, sched);
1282 		ip_vs_service_free(svc);
1283 	}
1284 	ip_vs_scheduler_put(sched);
1285 	ip_vs_pe_put(pe);
1286 
1287 	/* decrease the module use count */
1288 	ip_vs_use_count_dec();
1289 
1290 	return ret;
1291 }
1292 
1293 
1294 /*
1295  *	Edit a service and bind it with a new scheduler
1296  */
1297 static int
ip_vs_edit_service(struct ip_vs_service * svc,struct ip_vs_service_user_kern * u)1298 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1299 {
1300 	struct ip_vs_scheduler *sched = NULL, *old_sched;
1301 	struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1302 	int ret = 0;
1303 
1304 	/*
1305 	 * Lookup the scheduler, by 'u->sched_name'
1306 	 */
1307 	if (strcmp(u->sched_name, "none")) {
1308 		sched = ip_vs_scheduler_get(u->sched_name);
1309 		if (!sched) {
1310 			pr_info("Scheduler module ip_vs_%s not found\n",
1311 				u->sched_name);
1312 			return -ENOENT;
1313 		}
1314 	}
1315 	old_sched = sched;
1316 
1317 	if (u->pe_name && *u->pe_name) {
1318 		pe = ip_vs_pe_getbyname(u->pe_name);
1319 		if (pe == NULL) {
1320 			pr_info("persistence engine module ip_vs_pe_%s "
1321 				"not found\n", u->pe_name);
1322 			ret = -ENOENT;
1323 			goto out;
1324 		}
1325 		old_pe = pe;
1326 	}
1327 
1328 #ifdef CONFIG_IP_VS_IPV6
1329 	if (u->af == AF_INET6) {
1330 		__u32 plen = (__force __u32) u->netmask;
1331 
1332 		if (plen < 1 || plen > 128) {
1333 			ret = -EINVAL;
1334 			goto out;
1335 		}
1336 	}
1337 #endif
1338 
1339 	old_sched = rcu_dereference_protected(svc->scheduler, 1);
1340 	if (sched != old_sched) {
1341 		if (old_sched) {
1342 			ip_vs_unbind_scheduler(svc, old_sched);
1343 			RCU_INIT_POINTER(svc->scheduler, NULL);
1344 			/* Wait all svc->sched_data users */
1345 			synchronize_rcu();
1346 		}
1347 		/* Bind the new scheduler */
1348 		if (sched) {
1349 			ret = ip_vs_bind_scheduler(svc, sched);
1350 			if (ret) {
1351 				ip_vs_scheduler_put(sched);
1352 				goto out;
1353 			}
1354 		}
1355 	}
1356 
1357 	/*
1358 	 * Set the flags and timeout value
1359 	 */
1360 	svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1361 	svc->timeout = u->timeout * HZ;
1362 	svc->netmask = u->netmask;
1363 
1364 	old_pe = rcu_dereference_protected(svc->pe, 1);
1365 	if (pe != old_pe)
1366 		rcu_assign_pointer(svc->pe, pe);
1367 
1368 out:
1369 	ip_vs_scheduler_put(old_sched);
1370 	ip_vs_pe_put(old_pe);
1371 	return ret;
1372 }
1373 
1374 /*
1375  *	Delete a service from the service list
1376  *	- The service must be unlinked, unlocked and not referenced!
1377  *	- We are called under _bh lock
1378  */
__ip_vs_del_service(struct ip_vs_service * svc,bool cleanup)1379 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1380 {
1381 	struct ip_vs_dest *dest, *nxt;
1382 	struct ip_vs_scheduler *old_sched;
1383 	struct ip_vs_pe *old_pe;
1384 	struct netns_ipvs *ipvs = net_ipvs(svc->net);
1385 
1386 	pr_info("%s: enter\n", __func__);
1387 
1388 	/* Count only IPv4 services for old get/setsockopt interface */
1389 	if (svc->af == AF_INET)
1390 		ipvs->num_services--;
1391 
1392 	ip_vs_stop_estimator(svc->net, &svc->stats);
1393 
1394 	/* Unbind scheduler */
1395 	old_sched = rcu_dereference_protected(svc->scheduler, 1);
1396 	ip_vs_unbind_scheduler(svc, old_sched);
1397 	ip_vs_scheduler_put(old_sched);
1398 
1399 	/* Unbind persistence engine, keep svc->pe */
1400 	old_pe = rcu_dereference_protected(svc->pe, 1);
1401 	ip_vs_pe_put(old_pe);
1402 
1403 	/*
1404 	 *    Unlink the whole destination list
1405 	 */
1406 	list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1407 		__ip_vs_unlink_dest(svc, dest, 0);
1408 		__ip_vs_del_dest(svc->net, dest, cleanup);
1409 	}
1410 
1411 	/*
1412 	 *    Update the virtual service counters
1413 	 */
1414 	if (svc->port == FTPPORT)
1415 		atomic_dec(&ipvs->ftpsvc_counter);
1416 	else if (svc->port == 0)
1417 		atomic_dec(&ipvs->nullsvc_counter);
1418 
1419 	/*
1420 	 *    Free the service if nobody refers to it
1421 	 */
1422 	__ip_vs_svc_put(svc, true);
1423 
1424 	/* decrease the module use count */
1425 	ip_vs_use_count_dec();
1426 }
1427 
1428 /*
1429  * Unlink a service from list and try to delete it if its refcnt reached 0
1430  */
ip_vs_unlink_service(struct ip_vs_service * svc,bool cleanup)1431 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1432 {
1433 	/* Hold svc to avoid double release from dest_trash */
1434 	atomic_inc(&svc->refcnt);
1435 	/*
1436 	 * Unhash it from the service table
1437 	 */
1438 	ip_vs_svc_unhash(svc);
1439 
1440 	__ip_vs_del_service(svc, cleanup);
1441 }
1442 
1443 /*
1444  *	Delete a service from the service list
1445  */
ip_vs_del_service(struct ip_vs_service * svc)1446 static int ip_vs_del_service(struct ip_vs_service *svc)
1447 {
1448 	if (svc == NULL)
1449 		return -EEXIST;
1450 	ip_vs_unlink_service(svc, false);
1451 
1452 	return 0;
1453 }
1454 
1455 
1456 /*
1457  *	Flush all the virtual services
1458  */
ip_vs_flush(struct net * net,bool cleanup)1459 static int ip_vs_flush(struct net *net, bool cleanup)
1460 {
1461 	int idx;
1462 	struct ip_vs_service *svc;
1463 	struct hlist_node *n;
1464 
1465 	/*
1466 	 * Flush the service table hashed by <netns,protocol,addr,port>
1467 	 */
1468 	for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1469 		hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1470 					  s_list) {
1471 			if (net_eq(svc->net, net))
1472 				ip_vs_unlink_service(svc, cleanup);
1473 		}
1474 	}
1475 
1476 	/*
1477 	 * Flush the service table hashed by fwmark
1478 	 */
1479 	for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1480 		hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1481 					  f_list) {
1482 			if (net_eq(svc->net, net))
1483 				ip_vs_unlink_service(svc, cleanup);
1484 		}
1485 	}
1486 
1487 	return 0;
1488 }
1489 
1490 /*
1491  *	Delete service by {netns} in the service table.
1492  *	Called by __ip_vs_cleanup()
1493  */
ip_vs_service_net_cleanup(struct net * net)1494 void ip_vs_service_net_cleanup(struct net *net)
1495 {
1496 	EnterFunction(2);
1497 	/* Check for "full" addressed entries */
1498 	mutex_lock(&__ip_vs_mutex);
1499 	ip_vs_flush(net, true);
1500 	mutex_unlock(&__ip_vs_mutex);
1501 	LeaveFunction(2);
1502 }
1503 
1504 /* Put all references for device (dst_cache) */
1505 static inline void
ip_vs_forget_dev(struct ip_vs_dest * dest,struct net_device * dev)1506 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1507 {
1508 	struct ip_vs_dest_dst *dest_dst;
1509 
1510 	spin_lock_bh(&dest->dst_lock);
1511 	dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1512 	if (dest_dst && dest_dst->dst_cache->dev == dev) {
1513 		IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1514 			      dev->name,
1515 			      IP_VS_DBG_ADDR(dest->af, &dest->addr),
1516 			      ntohs(dest->port),
1517 			      atomic_read(&dest->refcnt));
1518 		__ip_vs_dst_cache_reset(dest);
1519 	}
1520 	spin_unlock_bh(&dest->dst_lock);
1521 
1522 }
1523 /* Netdev event receiver
1524  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1525  */
ip_vs_dst_event(struct notifier_block * this,unsigned long event,void * ptr)1526 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1527 			   void *ptr)
1528 {
1529 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1530 	struct net *net = dev_net(dev);
1531 	struct netns_ipvs *ipvs = net_ipvs(net);
1532 	struct ip_vs_service *svc;
1533 	struct ip_vs_dest *dest;
1534 	unsigned int idx;
1535 
1536 	if (event != NETDEV_DOWN || !ipvs)
1537 		return NOTIFY_DONE;
1538 	IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1539 	EnterFunction(2);
1540 	mutex_lock(&__ip_vs_mutex);
1541 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1542 		hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1543 			if (net_eq(svc->net, net)) {
1544 				list_for_each_entry(dest, &svc->destinations,
1545 						    n_list) {
1546 					ip_vs_forget_dev(dest, dev);
1547 				}
1548 			}
1549 		}
1550 
1551 		hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1552 			if (net_eq(svc->net, net)) {
1553 				list_for_each_entry(dest, &svc->destinations,
1554 						    n_list) {
1555 					ip_vs_forget_dev(dest, dev);
1556 				}
1557 			}
1558 
1559 		}
1560 	}
1561 
1562 	spin_lock_bh(&ipvs->dest_trash_lock);
1563 	list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1564 		ip_vs_forget_dev(dest, dev);
1565 	}
1566 	spin_unlock_bh(&ipvs->dest_trash_lock);
1567 	mutex_unlock(&__ip_vs_mutex);
1568 	LeaveFunction(2);
1569 	return NOTIFY_DONE;
1570 }
1571 
1572 /*
1573  *	Zero counters in a service or all services
1574  */
ip_vs_zero_service(struct ip_vs_service * svc)1575 static int ip_vs_zero_service(struct ip_vs_service *svc)
1576 {
1577 	struct ip_vs_dest *dest;
1578 
1579 	list_for_each_entry(dest, &svc->destinations, n_list) {
1580 		ip_vs_zero_stats(&dest->stats);
1581 	}
1582 	ip_vs_zero_stats(&svc->stats);
1583 	return 0;
1584 }
1585 
ip_vs_zero_all(struct net * net)1586 static int ip_vs_zero_all(struct net *net)
1587 {
1588 	int idx;
1589 	struct ip_vs_service *svc;
1590 
1591 	for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1592 		hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1593 			if (net_eq(svc->net, net))
1594 				ip_vs_zero_service(svc);
1595 		}
1596 	}
1597 
1598 	for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1599 		hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1600 			if (net_eq(svc->net, net))
1601 				ip_vs_zero_service(svc);
1602 		}
1603 	}
1604 
1605 	ip_vs_zero_stats(&net_ipvs(net)->tot_stats);
1606 	return 0;
1607 }
1608 
1609 #ifdef CONFIG_SYSCTL
1610 
1611 static int zero;
1612 static int three = 3;
1613 
1614 static int
proc_do_defense_mode(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)1615 proc_do_defense_mode(struct ctl_table *table, int write,
1616 		     void __user *buffer, size_t *lenp, loff_t *ppos)
1617 {
1618 	struct net *net = current->nsproxy->net_ns;
1619 	int *valp = table->data;
1620 	int val = *valp;
1621 	int rc;
1622 
1623 	rc = proc_dointvec(table, write, buffer, lenp, ppos);
1624 	if (write && (*valp != val)) {
1625 		if ((*valp < 0) || (*valp > 3)) {
1626 			/* Restore the correct value */
1627 			*valp = val;
1628 		} else {
1629 			update_defense_level(net_ipvs(net));
1630 		}
1631 	}
1632 	return rc;
1633 }
1634 
1635 static int
proc_do_sync_threshold(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)1636 proc_do_sync_threshold(struct ctl_table *table, int write,
1637 		       void __user *buffer, size_t *lenp, loff_t *ppos)
1638 {
1639 	int *valp = table->data;
1640 	int val[2];
1641 	int rc;
1642 
1643 	/* backup the value first */
1644 	memcpy(val, valp, sizeof(val));
1645 
1646 	rc = proc_dointvec(table, write, buffer, lenp, ppos);
1647 	if (write && (valp[0] < 0 || valp[1] < 0 ||
1648 	    (valp[0] >= valp[1] && valp[1]))) {
1649 		/* Restore the correct value */
1650 		memcpy(valp, val, sizeof(val));
1651 	}
1652 	return rc;
1653 }
1654 
1655 static int
proc_do_sync_mode(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)1656 proc_do_sync_mode(struct ctl_table *table, int write,
1657 		     void __user *buffer, size_t *lenp, loff_t *ppos)
1658 {
1659 	int *valp = table->data;
1660 	int val = *valp;
1661 	int rc;
1662 
1663 	rc = proc_dointvec(table, write, buffer, lenp, ppos);
1664 	if (write && (*valp != val)) {
1665 		if ((*valp < 0) || (*valp > 1)) {
1666 			/* Restore the correct value */
1667 			*valp = val;
1668 		}
1669 	}
1670 	return rc;
1671 }
1672 
1673 static int
proc_do_sync_ports(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)1674 proc_do_sync_ports(struct ctl_table *table, int write,
1675 		   void __user *buffer, size_t *lenp, loff_t *ppos)
1676 {
1677 	int *valp = table->data;
1678 	int val = *valp;
1679 	int rc;
1680 
1681 	rc = proc_dointvec(table, write, buffer, lenp, ppos);
1682 	if (write && (*valp != val)) {
1683 		if (*valp < 1 || !is_power_of_2(*valp)) {
1684 			/* Restore the correct value */
1685 			*valp = val;
1686 		}
1687 	}
1688 	return rc;
1689 }
1690 
1691 /*
1692  *	IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1693  *	Do not change order or insert new entries without
1694  *	align with netns init in ip_vs_control_net_init()
1695  */
1696 
1697 static struct ctl_table vs_vars[] = {
1698 	{
1699 		.procname	= "amemthresh",
1700 		.maxlen		= sizeof(int),
1701 		.mode		= 0644,
1702 		.proc_handler	= proc_dointvec,
1703 	},
1704 	{
1705 		.procname	= "am_droprate",
1706 		.maxlen		= sizeof(int),
1707 		.mode		= 0644,
1708 		.proc_handler	= proc_dointvec,
1709 	},
1710 	{
1711 		.procname	= "drop_entry",
1712 		.maxlen		= sizeof(int),
1713 		.mode		= 0644,
1714 		.proc_handler	= proc_do_defense_mode,
1715 	},
1716 	{
1717 		.procname	= "drop_packet",
1718 		.maxlen		= sizeof(int),
1719 		.mode		= 0644,
1720 		.proc_handler	= proc_do_defense_mode,
1721 	},
1722 #ifdef CONFIG_IP_VS_NFCT
1723 	{
1724 		.procname	= "conntrack",
1725 		.maxlen		= sizeof(int),
1726 		.mode		= 0644,
1727 		.proc_handler	= &proc_dointvec,
1728 	},
1729 #endif
1730 	{
1731 		.procname	= "secure_tcp",
1732 		.maxlen		= sizeof(int),
1733 		.mode		= 0644,
1734 		.proc_handler	= proc_do_defense_mode,
1735 	},
1736 	{
1737 		.procname	= "snat_reroute",
1738 		.maxlen		= sizeof(int),
1739 		.mode		= 0644,
1740 		.proc_handler	= &proc_dointvec,
1741 	},
1742 	{
1743 		.procname	= "sync_version",
1744 		.maxlen		= sizeof(int),
1745 		.mode		= 0644,
1746 		.proc_handler	= &proc_do_sync_mode,
1747 	},
1748 	{
1749 		.procname	= "sync_ports",
1750 		.maxlen		= sizeof(int),
1751 		.mode		= 0644,
1752 		.proc_handler	= &proc_do_sync_ports,
1753 	},
1754 	{
1755 		.procname	= "sync_persist_mode",
1756 		.maxlen		= sizeof(int),
1757 		.mode		= 0644,
1758 		.proc_handler	= proc_dointvec,
1759 	},
1760 	{
1761 		.procname	= "sync_qlen_max",
1762 		.maxlen		= sizeof(unsigned long),
1763 		.mode		= 0644,
1764 		.proc_handler	= proc_doulongvec_minmax,
1765 	},
1766 	{
1767 		.procname	= "sync_sock_size",
1768 		.maxlen		= sizeof(int),
1769 		.mode		= 0644,
1770 		.proc_handler	= proc_dointvec,
1771 	},
1772 	{
1773 		.procname	= "cache_bypass",
1774 		.maxlen		= sizeof(int),
1775 		.mode		= 0644,
1776 		.proc_handler	= proc_dointvec,
1777 	},
1778 	{
1779 		.procname	= "expire_nodest_conn",
1780 		.maxlen		= sizeof(int),
1781 		.mode		= 0644,
1782 		.proc_handler	= proc_dointvec,
1783 	},
1784 	{
1785 		.procname	= "sloppy_tcp",
1786 		.maxlen		= sizeof(int),
1787 		.mode		= 0644,
1788 		.proc_handler	= proc_dointvec,
1789 	},
1790 	{
1791 		.procname	= "sloppy_sctp",
1792 		.maxlen		= sizeof(int),
1793 		.mode		= 0644,
1794 		.proc_handler	= proc_dointvec,
1795 	},
1796 	{
1797 		.procname	= "expire_quiescent_template",
1798 		.maxlen		= sizeof(int),
1799 		.mode		= 0644,
1800 		.proc_handler	= proc_dointvec,
1801 	},
1802 	{
1803 		.procname	= "sync_threshold",
1804 		.maxlen		=
1805 			sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1806 		.mode		= 0644,
1807 		.proc_handler	= proc_do_sync_threshold,
1808 	},
1809 	{
1810 		.procname	= "sync_refresh_period",
1811 		.maxlen		= sizeof(int),
1812 		.mode		= 0644,
1813 		.proc_handler	= proc_dointvec_jiffies,
1814 	},
1815 	{
1816 		.procname	= "sync_retries",
1817 		.maxlen		= sizeof(int),
1818 		.mode		= 0644,
1819 		.proc_handler	= proc_dointvec_minmax,
1820 		.extra1		= &zero,
1821 		.extra2		= &three,
1822 	},
1823 	{
1824 		.procname	= "nat_icmp_send",
1825 		.maxlen		= sizeof(int),
1826 		.mode		= 0644,
1827 		.proc_handler	= proc_dointvec,
1828 	},
1829 	{
1830 		.procname	= "pmtu_disc",
1831 		.maxlen		= sizeof(int),
1832 		.mode		= 0644,
1833 		.proc_handler	= proc_dointvec,
1834 	},
1835 	{
1836 		.procname	= "backup_only",
1837 		.maxlen		= sizeof(int),
1838 		.mode		= 0644,
1839 		.proc_handler	= proc_dointvec,
1840 	},
1841 	{
1842 		.procname	= "conn_reuse_mode",
1843 		.maxlen		= sizeof(int),
1844 		.mode		= 0644,
1845 		.proc_handler	= proc_dointvec,
1846 	},
1847 #ifdef CONFIG_IP_VS_DEBUG
1848 	{
1849 		.procname	= "debug_level",
1850 		.data		= &sysctl_ip_vs_debug_level,
1851 		.maxlen		= sizeof(int),
1852 		.mode		= 0644,
1853 		.proc_handler	= proc_dointvec,
1854 	},
1855 #endif
1856 	{ }
1857 };
1858 
1859 #endif
1860 
1861 #ifdef CONFIG_PROC_FS
1862 
1863 struct ip_vs_iter {
1864 	struct seq_net_private p;  /* Do not move this, netns depends upon it*/
1865 	struct hlist_head *table;
1866 	int bucket;
1867 };
1868 
1869 /*
1870  *	Write the contents of the VS rule table to a PROCfs file.
1871  *	(It is kept just for backward compatibility)
1872  */
ip_vs_fwd_name(unsigned int flags)1873 static inline const char *ip_vs_fwd_name(unsigned int flags)
1874 {
1875 	switch (flags & IP_VS_CONN_F_FWD_MASK) {
1876 	case IP_VS_CONN_F_LOCALNODE:
1877 		return "Local";
1878 	case IP_VS_CONN_F_TUNNEL:
1879 		return "Tunnel";
1880 	case IP_VS_CONN_F_DROUTE:
1881 		return "Route";
1882 	default:
1883 		return "Masq";
1884 	}
1885 }
1886 
1887 
1888 /* Get the Nth entry in the two lists */
ip_vs_info_array(struct seq_file * seq,loff_t pos)1889 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1890 {
1891 	struct net *net = seq_file_net(seq);
1892 	struct ip_vs_iter *iter = seq->private;
1893 	int idx;
1894 	struct ip_vs_service *svc;
1895 
1896 	/* look in hash by protocol */
1897 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1898 		hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
1899 			if (net_eq(svc->net, net) && pos-- == 0) {
1900 				iter->table = ip_vs_svc_table;
1901 				iter->bucket = idx;
1902 				return svc;
1903 			}
1904 		}
1905 	}
1906 
1907 	/* keep looking in fwmark */
1908 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1909 		hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
1910 					 f_list) {
1911 			if (net_eq(svc->net, net) && pos-- == 0) {
1912 				iter->table = ip_vs_svc_fwm_table;
1913 				iter->bucket = idx;
1914 				return svc;
1915 			}
1916 		}
1917 	}
1918 
1919 	return NULL;
1920 }
1921 
ip_vs_info_seq_start(struct seq_file * seq,loff_t * pos)1922 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1923 	__acquires(RCU)
1924 {
1925 	rcu_read_lock();
1926 	return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1927 }
1928 
1929 
ip_vs_info_seq_next(struct seq_file * seq,void * v,loff_t * pos)1930 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1931 {
1932 	struct hlist_node *e;
1933 	struct ip_vs_iter *iter;
1934 	struct ip_vs_service *svc;
1935 
1936 	++*pos;
1937 	if (v == SEQ_START_TOKEN)
1938 		return ip_vs_info_array(seq,0);
1939 
1940 	svc = v;
1941 	iter = seq->private;
1942 
1943 	if (iter->table == ip_vs_svc_table) {
1944 		/* next service in table hashed by protocol */
1945 		e = rcu_dereference(hlist_next_rcu(&svc->s_list));
1946 		if (e)
1947 			return hlist_entry(e, struct ip_vs_service, s_list);
1948 
1949 		while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1950 			hlist_for_each_entry_rcu(svc,
1951 						 &ip_vs_svc_table[iter->bucket],
1952 						 s_list) {
1953 				return svc;
1954 			}
1955 		}
1956 
1957 		iter->table = ip_vs_svc_fwm_table;
1958 		iter->bucket = -1;
1959 		goto scan_fwmark;
1960 	}
1961 
1962 	/* next service in hashed by fwmark */
1963 	e = rcu_dereference(hlist_next_rcu(&svc->f_list));
1964 	if (e)
1965 		return hlist_entry(e, struct ip_vs_service, f_list);
1966 
1967  scan_fwmark:
1968 	while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1969 		hlist_for_each_entry_rcu(svc,
1970 					 &ip_vs_svc_fwm_table[iter->bucket],
1971 					 f_list)
1972 			return svc;
1973 	}
1974 
1975 	return NULL;
1976 }
1977 
ip_vs_info_seq_stop(struct seq_file * seq,void * v)1978 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
1979 	__releases(RCU)
1980 {
1981 	rcu_read_unlock();
1982 }
1983 
1984 
ip_vs_info_seq_show(struct seq_file * seq,void * v)1985 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
1986 {
1987 	if (v == SEQ_START_TOKEN) {
1988 		seq_printf(seq,
1989 			"IP Virtual Server version %d.%d.%d (size=%d)\n",
1990 			NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
1991 		seq_puts(seq,
1992 			 "Prot LocalAddress:Port Scheduler Flags\n");
1993 		seq_puts(seq,
1994 			 "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
1995 	} else {
1996 		const struct ip_vs_service *svc = v;
1997 		const struct ip_vs_iter *iter = seq->private;
1998 		const struct ip_vs_dest *dest;
1999 		struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2000 		char *sched_name = sched ? sched->name : "none";
2001 
2002 		if (iter->table == ip_vs_svc_table) {
2003 #ifdef CONFIG_IP_VS_IPV6
2004 			if (svc->af == AF_INET6)
2005 				seq_printf(seq, "%s  [%pI6]:%04X %s ",
2006 					   ip_vs_proto_name(svc->protocol),
2007 					   &svc->addr.in6,
2008 					   ntohs(svc->port),
2009 					   sched_name);
2010 			else
2011 #endif
2012 				seq_printf(seq, "%s  %08X:%04X %s %s ",
2013 					   ip_vs_proto_name(svc->protocol),
2014 					   ntohl(svc->addr.ip),
2015 					   ntohs(svc->port),
2016 					   sched_name,
2017 					   (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2018 		} else {
2019 			seq_printf(seq, "FWM  %08X %s %s",
2020 				   svc->fwmark, sched_name,
2021 				   (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2022 		}
2023 
2024 		if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2025 			seq_printf(seq, "persistent %d %08X\n",
2026 				svc->timeout,
2027 				ntohl(svc->netmask));
2028 		else
2029 			seq_putc(seq, '\n');
2030 
2031 		list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2032 #ifdef CONFIG_IP_VS_IPV6
2033 			if (dest->af == AF_INET6)
2034 				seq_printf(seq,
2035 					   "  -> [%pI6]:%04X"
2036 					   "      %-7s %-6d %-10d %-10d\n",
2037 					   &dest->addr.in6,
2038 					   ntohs(dest->port),
2039 					   ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2040 					   atomic_read(&dest->weight),
2041 					   atomic_read(&dest->activeconns),
2042 					   atomic_read(&dest->inactconns));
2043 			else
2044 #endif
2045 				seq_printf(seq,
2046 					   "  -> %08X:%04X      "
2047 					   "%-7s %-6d %-10d %-10d\n",
2048 					   ntohl(dest->addr.ip),
2049 					   ntohs(dest->port),
2050 					   ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2051 					   atomic_read(&dest->weight),
2052 					   atomic_read(&dest->activeconns),
2053 					   atomic_read(&dest->inactconns));
2054 
2055 		}
2056 	}
2057 	return 0;
2058 }
2059 
2060 static const struct seq_operations ip_vs_info_seq_ops = {
2061 	.start = ip_vs_info_seq_start,
2062 	.next  = ip_vs_info_seq_next,
2063 	.stop  = ip_vs_info_seq_stop,
2064 	.show  = ip_vs_info_seq_show,
2065 };
2066 
ip_vs_info_open(struct inode * inode,struct file * file)2067 static int ip_vs_info_open(struct inode *inode, struct file *file)
2068 {
2069 	return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2070 			sizeof(struct ip_vs_iter));
2071 }
2072 
2073 static const struct file_operations ip_vs_info_fops = {
2074 	.owner	 = THIS_MODULE,
2075 	.open    = ip_vs_info_open,
2076 	.read    = seq_read,
2077 	.llseek  = seq_lseek,
2078 	.release = seq_release_net,
2079 };
2080 
ip_vs_stats_show(struct seq_file * seq,void * v)2081 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2082 {
2083 	struct net *net = seq_file_single_net(seq);
2084 	struct ip_vs_kstats show;
2085 
2086 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2087 	seq_puts(seq,
2088 		 "   Total Incoming Outgoing         Incoming         Outgoing\n");
2089 	seq_printf(seq,
2090 		   "   Conns  Packets  Packets            Bytes            Bytes\n");
2091 
2092 	ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2093 	seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n\n",
2094 		   (unsigned long long)show.conns,
2095 		   (unsigned long long)show.inpkts,
2096 		   (unsigned long long)show.outpkts,
2097 		   (unsigned long long)show.inbytes,
2098 		   (unsigned long long)show.outbytes);
2099 
2100 /*                01234567 01234567 01234567 0123456701234567 0123456701234567*/
2101 	seq_puts(seq,
2102 		 " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2103 	seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n",
2104 		   (unsigned long long)show.cps,
2105 		   (unsigned long long)show.inpps,
2106 		   (unsigned long long)show.outpps,
2107 		   (unsigned long long)show.inbps,
2108 		   (unsigned long long)show.outbps);
2109 
2110 	return 0;
2111 }
2112 
ip_vs_stats_seq_open(struct inode * inode,struct file * file)2113 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2114 {
2115 	return single_open_net(inode, file, ip_vs_stats_show);
2116 }
2117 
2118 static const struct file_operations ip_vs_stats_fops = {
2119 	.owner = THIS_MODULE,
2120 	.open = ip_vs_stats_seq_open,
2121 	.read = seq_read,
2122 	.llseek = seq_lseek,
2123 	.release = single_release_net,
2124 };
2125 
ip_vs_stats_percpu_show(struct seq_file * seq,void * v)2126 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2127 {
2128 	struct net *net = seq_file_single_net(seq);
2129 	struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2130 	struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2131 	struct ip_vs_kstats kstats;
2132 	int i;
2133 
2134 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2135 	seq_puts(seq,
2136 		 "       Total Incoming Outgoing         Incoming         Outgoing\n");
2137 	seq_printf(seq,
2138 		   "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2139 
2140 	for_each_possible_cpu(i) {
2141 		struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2142 		unsigned int start;
2143 		u64 conns, inpkts, outpkts, inbytes, outbytes;
2144 
2145 		do {
2146 			start = u64_stats_fetch_begin_irq(&u->syncp);
2147 			conns = u->cnt.conns;
2148 			inpkts = u->cnt.inpkts;
2149 			outpkts = u->cnt.outpkts;
2150 			inbytes = u->cnt.inbytes;
2151 			outbytes = u->cnt.outbytes;
2152 		} while (u64_stats_fetch_retry_irq(&u->syncp, start));
2153 
2154 		seq_printf(seq, "%3X %8LX %8LX %8LX %16LX %16LX\n",
2155 			   i, (u64)conns, (u64)inpkts,
2156 			   (u64)outpkts, (u64)inbytes,
2157 			   (u64)outbytes);
2158 	}
2159 
2160 	ip_vs_copy_stats(&kstats, tot_stats);
2161 
2162 	seq_printf(seq, "  ~ %8LX %8LX %8LX %16LX %16LX\n\n",
2163 		   (unsigned long long)kstats.conns,
2164 		   (unsigned long long)kstats.inpkts,
2165 		   (unsigned long long)kstats.outpkts,
2166 		   (unsigned long long)kstats.inbytes,
2167 		   (unsigned long long)kstats.outbytes);
2168 
2169 /*                ... 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2170 	seq_puts(seq,
2171 		 "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2172 	seq_printf(seq, "    %8LX %8LX %8LX %16LX %16LX\n",
2173 		   kstats.cps,
2174 		   kstats.inpps,
2175 		   kstats.outpps,
2176 		   kstats.inbps,
2177 		   kstats.outbps);
2178 
2179 	return 0;
2180 }
2181 
ip_vs_stats_percpu_seq_open(struct inode * inode,struct file * file)2182 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2183 {
2184 	return single_open_net(inode, file, ip_vs_stats_percpu_show);
2185 }
2186 
2187 static const struct file_operations ip_vs_stats_percpu_fops = {
2188 	.owner = THIS_MODULE,
2189 	.open = ip_vs_stats_percpu_seq_open,
2190 	.read = seq_read,
2191 	.llseek = seq_lseek,
2192 	.release = single_release_net,
2193 };
2194 #endif
2195 
2196 /*
2197  *	Set timeout values for tcp tcpfin udp in the timeout_table.
2198  */
ip_vs_set_timeout(struct net * net,struct ip_vs_timeout_user * u)2199 static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
2200 {
2201 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2202 	struct ip_vs_proto_data *pd;
2203 #endif
2204 
2205 	IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2206 		  u->tcp_timeout,
2207 		  u->tcp_fin_timeout,
2208 		  u->udp_timeout);
2209 
2210 #ifdef CONFIG_IP_VS_PROTO_TCP
2211 	if (u->tcp_timeout) {
2212 		pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2213 		pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2214 			= u->tcp_timeout * HZ;
2215 	}
2216 
2217 	if (u->tcp_fin_timeout) {
2218 		pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2219 		pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2220 			= u->tcp_fin_timeout * HZ;
2221 	}
2222 #endif
2223 
2224 #ifdef CONFIG_IP_VS_PROTO_UDP
2225 	if (u->udp_timeout) {
2226 		pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2227 		pd->timeout_table[IP_VS_UDP_S_NORMAL]
2228 			= u->udp_timeout * HZ;
2229 	}
2230 #endif
2231 	return 0;
2232 }
2233 
2234 #define CMDID(cmd)		(cmd - IP_VS_BASE_CTL)
2235 
2236 struct ip_vs_svcdest_user {
2237 	struct ip_vs_service_user	s;
2238 	struct ip_vs_dest_user		d;
2239 };
2240 
2241 static const unsigned char set_arglen[CMDID(IP_VS_SO_SET_MAX) + 1] = {
2242 	[CMDID(IP_VS_SO_SET_ADD)]         = sizeof(struct ip_vs_service_user),
2243 	[CMDID(IP_VS_SO_SET_EDIT)]        = sizeof(struct ip_vs_service_user),
2244 	[CMDID(IP_VS_SO_SET_DEL)]         = sizeof(struct ip_vs_service_user),
2245 	[CMDID(IP_VS_SO_SET_ADDDEST)]     = sizeof(struct ip_vs_svcdest_user),
2246 	[CMDID(IP_VS_SO_SET_DELDEST)]     = sizeof(struct ip_vs_svcdest_user),
2247 	[CMDID(IP_VS_SO_SET_EDITDEST)]    = sizeof(struct ip_vs_svcdest_user),
2248 	[CMDID(IP_VS_SO_SET_TIMEOUT)]     = sizeof(struct ip_vs_timeout_user),
2249 	[CMDID(IP_VS_SO_SET_STARTDAEMON)] = sizeof(struct ip_vs_daemon_user),
2250 	[CMDID(IP_VS_SO_SET_STOPDAEMON)]  = sizeof(struct ip_vs_daemon_user),
2251 	[CMDID(IP_VS_SO_SET_ZERO)]        = sizeof(struct ip_vs_service_user),
2252 };
2253 
2254 union ip_vs_set_arglen {
2255 	struct ip_vs_service_user	field_IP_VS_SO_SET_ADD;
2256 	struct ip_vs_service_user	field_IP_VS_SO_SET_EDIT;
2257 	struct ip_vs_service_user	field_IP_VS_SO_SET_DEL;
2258 	struct ip_vs_svcdest_user	field_IP_VS_SO_SET_ADDDEST;
2259 	struct ip_vs_svcdest_user	field_IP_VS_SO_SET_DELDEST;
2260 	struct ip_vs_svcdest_user	field_IP_VS_SO_SET_EDITDEST;
2261 	struct ip_vs_timeout_user	field_IP_VS_SO_SET_TIMEOUT;
2262 	struct ip_vs_daemon_user	field_IP_VS_SO_SET_STARTDAEMON;
2263 	struct ip_vs_daemon_user	field_IP_VS_SO_SET_STOPDAEMON;
2264 	struct ip_vs_service_user	field_IP_VS_SO_SET_ZERO;
2265 };
2266 
2267 #define MAX_SET_ARGLEN	sizeof(union ip_vs_set_arglen)
2268 
ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern * usvc,struct ip_vs_service_user * usvc_compat)2269 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2270 				  struct ip_vs_service_user *usvc_compat)
2271 {
2272 	memset(usvc, 0, sizeof(*usvc));
2273 
2274 	usvc->af		= AF_INET;
2275 	usvc->protocol		= usvc_compat->protocol;
2276 	usvc->addr.ip		= usvc_compat->addr;
2277 	usvc->port		= usvc_compat->port;
2278 	usvc->fwmark		= usvc_compat->fwmark;
2279 
2280 	/* Deep copy of sched_name is not needed here */
2281 	usvc->sched_name	= usvc_compat->sched_name;
2282 
2283 	usvc->flags		= usvc_compat->flags;
2284 	usvc->timeout		= usvc_compat->timeout;
2285 	usvc->netmask		= usvc_compat->netmask;
2286 }
2287 
ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern * udest,struct ip_vs_dest_user * udest_compat)2288 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2289 				   struct ip_vs_dest_user *udest_compat)
2290 {
2291 	memset(udest, 0, sizeof(*udest));
2292 
2293 	udest->addr.ip		= udest_compat->addr;
2294 	udest->port		= udest_compat->port;
2295 	udest->conn_flags	= udest_compat->conn_flags;
2296 	udest->weight		= udest_compat->weight;
2297 	udest->u_threshold	= udest_compat->u_threshold;
2298 	udest->l_threshold	= udest_compat->l_threshold;
2299 	udest->af		= AF_INET;
2300 }
2301 
2302 static int
do_ip_vs_set_ctl(struct sock * sk,int cmd,void __user * user,unsigned int len)2303 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2304 {
2305 	struct net *net = sock_net(sk);
2306 	int ret;
2307 	unsigned char arg[MAX_SET_ARGLEN];
2308 	struct ip_vs_service_user *usvc_compat;
2309 	struct ip_vs_service_user_kern usvc;
2310 	struct ip_vs_service *svc;
2311 	struct ip_vs_dest_user *udest_compat;
2312 	struct ip_vs_dest_user_kern udest;
2313 	struct netns_ipvs *ipvs = net_ipvs(net);
2314 
2315 	BUILD_BUG_ON(sizeof(arg) > 255);
2316 	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2317 		return -EPERM;
2318 
2319 	if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2320 		return -EINVAL;
2321 	if (len != set_arglen[CMDID(cmd)]) {
2322 		IP_VS_DBG(1, "set_ctl: len %u != %u\n",
2323 			  len, set_arglen[CMDID(cmd)]);
2324 		return -EINVAL;
2325 	}
2326 
2327 	if (copy_from_user(arg, user, len) != 0)
2328 		return -EFAULT;
2329 
2330 	/* increase the module use count */
2331 	ip_vs_use_count_inc();
2332 
2333 	/* Handle daemons since they have another lock */
2334 	if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2335 	    cmd == IP_VS_SO_SET_STOPDAEMON) {
2336 		struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2337 
2338 		mutex_lock(&ipvs->sync_mutex);
2339 		if (cmd == IP_VS_SO_SET_STARTDAEMON)
2340 			ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
2341 						dm->syncid);
2342 		else
2343 			ret = stop_sync_thread(net, dm->state);
2344 		mutex_unlock(&ipvs->sync_mutex);
2345 		goto out_dec;
2346 	}
2347 
2348 	mutex_lock(&__ip_vs_mutex);
2349 	if (cmd == IP_VS_SO_SET_FLUSH) {
2350 		/* Flush the virtual service */
2351 		ret = ip_vs_flush(net, false);
2352 		goto out_unlock;
2353 	} else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2354 		/* Set timeout values for (tcp tcpfin udp) */
2355 		ret = ip_vs_set_timeout(net, (struct ip_vs_timeout_user *)arg);
2356 		goto out_unlock;
2357 	}
2358 
2359 	usvc_compat = (struct ip_vs_service_user *)arg;
2360 	udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2361 
2362 	/* We only use the new structs internally, so copy userspace compat
2363 	 * structs to extended internal versions */
2364 	ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2365 	ip_vs_copy_udest_compat(&udest, udest_compat);
2366 
2367 	if (cmd == IP_VS_SO_SET_ZERO) {
2368 		/* if no service address is set, zero counters in all */
2369 		if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2370 			ret = ip_vs_zero_all(net);
2371 			goto out_unlock;
2372 		}
2373 	}
2374 
2375 	/* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2376 	if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2377 	    usvc.protocol != IPPROTO_SCTP) {
2378 		pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2379 		       usvc.protocol, &usvc.addr.ip,
2380 		       ntohs(usvc.port), usvc.sched_name);
2381 		ret = -EFAULT;
2382 		goto out_unlock;
2383 	}
2384 
2385 	/* Lookup the exact service by <protocol, addr, port> or fwmark */
2386 	rcu_read_lock();
2387 	if (usvc.fwmark == 0)
2388 		svc = __ip_vs_service_find(net, usvc.af, usvc.protocol,
2389 					   &usvc.addr, usvc.port);
2390 	else
2391 		svc = __ip_vs_svc_fwm_find(net, usvc.af, usvc.fwmark);
2392 	rcu_read_unlock();
2393 
2394 	if (cmd != IP_VS_SO_SET_ADD
2395 	    && (svc == NULL || svc->protocol != usvc.protocol)) {
2396 		ret = -ESRCH;
2397 		goto out_unlock;
2398 	}
2399 
2400 	switch (cmd) {
2401 	case IP_VS_SO_SET_ADD:
2402 		if (svc != NULL)
2403 			ret = -EEXIST;
2404 		else
2405 			ret = ip_vs_add_service(net, &usvc, &svc);
2406 		break;
2407 	case IP_VS_SO_SET_EDIT:
2408 		ret = ip_vs_edit_service(svc, &usvc);
2409 		break;
2410 	case IP_VS_SO_SET_DEL:
2411 		ret = ip_vs_del_service(svc);
2412 		if (!ret)
2413 			goto out_unlock;
2414 		break;
2415 	case IP_VS_SO_SET_ZERO:
2416 		ret = ip_vs_zero_service(svc);
2417 		break;
2418 	case IP_VS_SO_SET_ADDDEST:
2419 		ret = ip_vs_add_dest(svc, &udest);
2420 		break;
2421 	case IP_VS_SO_SET_EDITDEST:
2422 		ret = ip_vs_edit_dest(svc, &udest);
2423 		break;
2424 	case IP_VS_SO_SET_DELDEST:
2425 		ret = ip_vs_del_dest(svc, &udest);
2426 		break;
2427 	default:
2428 		ret = -EINVAL;
2429 	}
2430 
2431   out_unlock:
2432 	mutex_unlock(&__ip_vs_mutex);
2433   out_dec:
2434 	/* decrease the module use count */
2435 	ip_vs_use_count_dec();
2436 
2437 	return ret;
2438 }
2439 
2440 
2441 static void
ip_vs_copy_service(struct ip_vs_service_entry * dst,struct ip_vs_service * src)2442 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2443 {
2444 	struct ip_vs_scheduler *sched;
2445 	struct ip_vs_kstats kstats;
2446 	char *sched_name;
2447 
2448 	sched = rcu_dereference_protected(src->scheduler, 1);
2449 	sched_name = sched ? sched->name : "none";
2450 	dst->protocol = src->protocol;
2451 	dst->addr = src->addr.ip;
2452 	dst->port = src->port;
2453 	dst->fwmark = src->fwmark;
2454 	strlcpy(dst->sched_name, sched_name, sizeof(dst->sched_name));
2455 	dst->flags = src->flags;
2456 	dst->timeout = src->timeout / HZ;
2457 	dst->netmask = src->netmask;
2458 	dst->num_dests = src->num_dests;
2459 	ip_vs_copy_stats(&kstats, &src->stats);
2460 	ip_vs_export_stats_user(&dst->stats, &kstats);
2461 }
2462 
2463 static inline int
__ip_vs_get_service_entries(struct net * net,const struct ip_vs_get_services * get,struct ip_vs_get_services __user * uptr)2464 __ip_vs_get_service_entries(struct net *net,
2465 			    const struct ip_vs_get_services *get,
2466 			    struct ip_vs_get_services __user *uptr)
2467 {
2468 	int idx, count=0;
2469 	struct ip_vs_service *svc;
2470 	struct ip_vs_service_entry entry;
2471 	int ret = 0;
2472 
2473 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2474 		hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2475 			/* Only expose IPv4 entries to old interface */
2476 			if (svc->af != AF_INET || !net_eq(svc->net, net))
2477 				continue;
2478 
2479 			if (count >= get->num_services)
2480 				goto out;
2481 			memset(&entry, 0, sizeof(entry));
2482 			ip_vs_copy_service(&entry, svc);
2483 			if (copy_to_user(&uptr->entrytable[count],
2484 					 &entry, sizeof(entry))) {
2485 				ret = -EFAULT;
2486 				goto out;
2487 			}
2488 			count++;
2489 		}
2490 	}
2491 
2492 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2493 		hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2494 			/* Only expose IPv4 entries to old interface */
2495 			if (svc->af != AF_INET || !net_eq(svc->net, net))
2496 				continue;
2497 
2498 			if (count >= get->num_services)
2499 				goto out;
2500 			memset(&entry, 0, sizeof(entry));
2501 			ip_vs_copy_service(&entry, svc);
2502 			if (copy_to_user(&uptr->entrytable[count],
2503 					 &entry, sizeof(entry))) {
2504 				ret = -EFAULT;
2505 				goto out;
2506 			}
2507 			count++;
2508 		}
2509 	}
2510 out:
2511 	return ret;
2512 }
2513 
2514 static inline int
__ip_vs_get_dest_entries(struct net * net,const struct ip_vs_get_dests * get,struct ip_vs_get_dests __user * uptr)2515 __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
2516 			 struct ip_vs_get_dests __user *uptr)
2517 {
2518 	struct ip_vs_service *svc;
2519 	union nf_inet_addr addr = { .ip = get->addr };
2520 	int ret = 0;
2521 
2522 	rcu_read_lock();
2523 	if (get->fwmark)
2524 		svc = __ip_vs_svc_fwm_find(net, AF_INET, get->fwmark);
2525 	else
2526 		svc = __ip_vs_service_find(net, AF_INET, get->protocol, &addr,
2527 					   get->port);
2528 	rcu_read_unlock();
2529 
2530 	if (svc) {
2531 		int count = 0;
2532 		struct ip_vs_dest *dest;
2533 		struct ip_vs_dest_entry entry;
2534 		struct ip_vs_kstats kstats;
2535 
2536 		memset(&entry, 0, sizeof(entry));
2537 		list_for_each_entry(dest, &svc->destinations, n_list) {
2538 			if (count >= get->num_dests)
2539 				break;
2540 
2541 			/* Cannot expose heterogeneous members via sockopt
2542 			 * interface
2543 			 */
2544 			if (dest->af != svc->af)
2545 				continue;
2546 
2547 			entry.addr = dest->addr.ip;
2548 			entry.port = dest->port;
2549 			entry.conn_flags = atomic_read(&dest->conn_flags);
2550 			entry.weight = atomic_read(&dest->weight);
2551 			entry.u_threshold = dest->u_threshold;
2552 			entry.l_threshold = dest->l_threshold;
2553 			entry.activeconns = atomic_read(&dest->activeconns);
2554 			entry.inactconns = atomic_read(&dest->inactconns);
2555 			entry.persistconns = atomic_read(&dest->persistconns);
2556 			ip_vs_copy_stats(&kstats, &dest->stats);
2557 			ip_vs_export_stats_user(&entry.stats, &kstats);
2558 			if (copy_to_user(&uptr->entrytable[count],
2559 					 &entry, sizeof(entry))) {
2560 				ret = -EFAULT;
2561 				break;
2562 			}
2563 			count++;
2564 		}
2565 	} else
2566 		ret = -ESRCH;
2567 	return ret;
2568 }
2569 
2570 static inline void
__ip_vs_get_timeouts(struct net * net,struct ip_vs_timeout_user * u)2571 __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
2572 {
2573 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2574 	struct ip_vs_proto_data *pd;
2575 #endif
2576 
2577 	memset(u, 0, sizeof (*u));
2578 
2579 #ifdef CONFIG_IP_VS_PROTO_TCP
2580 	pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2581 	u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2582 	u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2583 #endif
2584 #ifdef CONFIG_IP_VS_PROTO_UDP
2585 	pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2586 	u->udp_timeout =
2587 			pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2588 #endif
2589 }
2590 
2591 static const unsigned char get_arglen[CMDID(IP_VS_SO_GET_MAX) + 1] = {
2592 	[CMDID(IP_VS_SO_GET_VERSION)]  = 64,
2593 	[CMDID(IP_VS_SO_GET_INFO)]     = sizeof(struct ip_vs_getinfo),
2594 	[CMDID(IP_VS_SO_GET_SERVICES)] = sizeof(struct ip_vs_get_services),
2595 	[CMDID(IP_VS_SO_GET_SERVICE)]  = sizeof(struct ip_vs_service_entry),
2596 	[CMDID(IP_VS_SO_GET_DESTS)]    = sizeof(struct ip_vs_get_dests),
2597 	[CMDID(IP_VS_SO_GET_TIMEOUT)]  = sizeof(struct ip_vs_timeout_user),
2598 	[CMDID(IP_VS_SO_GET_DAEMON)]   = 2 * sizeof(struct ip_vs_daemon_user),
2599 };
2600 
2601 union ip_vs_get_arglen {
2602 	char				field_IP_VS_SO_GET_VERSION[64];
2603 	struct ip_vs_getinfo		field_IP_VS_SO_GET_INFO;
2604 	struct ip_vs_get_services	field_IP_VS_SO_GET_SERVICES;
2605 	struct ip_vs_service_entry	field_IP_VS_SO_GET_SERVICE;
2606 	struct ip_vs_get_dests		field_IP_VS_SO_GET_DESTS;
2607 	struct ip_vs_timeout_user	field_IP_VS_SO_GET_TIMEOUT;
2608 	struct ip_vs_daemon_user	field_IP_VS_SO_GET_DAEMON[2];
2609 };
2610 
2611 #define MAX_GET_ARGLEN	sizeof(union ip_vs_get_arglen)
2612 
2613 static int
do_ip_vs_get_ctl(struct sock * sk,int cmd,void __user * user,int * len)2614 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2615 {
2616 	unsigned char arg[MAX_GET_ARGLEN];
2617 	int ret = 0;
2618 	unsigned int copylen;
2619 	struct net *net = sock_net(sk);
2620 	struct netns_ipvs *ipvs = net_ipvs(net);
2621 
2622 	BUG_ON(!net);
2623 	BUILD_BUG_ON(sizeof(arg) > 255);
2624 	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2625 		return -EPERM;
2626 
2627 	if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2628 		return -EINVAL;
2629 
2630 	copylen = get_arglen[CMDID(cmd)];
2631 	if (*len < (int) copylen) {
2632 		IP_VS_DBG(1, "get_ctl: len %d < %u\n", *len, copylen);
2633 		return -EINVAL;
2634 	}
2635 
2636 	if (copy_from_user(arg, user, copylen) != 0)
2637 		return -EFAULT;
2638 	/*
2639 	 * Handle daemons first since it has its own locking
2640 	 */
2641 	if (cmd == IP_VS_SO_GET_DAEMON) {
2642 		struct ip_vs_daemon_user d[2];
2643 
2644 		memset(&d, 0, sizeof(d));
2645 		mutex_lock(&ipvs->sync_mutex);
2646 		if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2647 			d[0].state = IP_VS_STATE_MASTER;
2648 			strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
2649 				sizeof(d[0].mcast_ifn));
2650 			d[0].syncid = ipvs->master_syncid;
2651 		}
2652 		if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2653 			d[1].state = IP_VS_STATE_BACKUP;
2654 			strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
2655 				sizeof(d[1].mcast_ifn));
2656 			d[1].syncid = ipvs->backup_syncid;
2657 		}
2658 		if (copy_to_user(user, &d, sizeof(d)) != 0)
2659 			ret = -EFAULT;
2660 		mutex_unlock(&ipvs->sync_mutex);
2661 		return ret;
2662 	}
2663 
2664 	mutex_lock(&__ip_vs_mutex);
2665 	switch (cmd) {
2666 	case IP_VS_SO_GET_VERSION:
2667 	{
2668 		char buf[64];
2669 
2670 		sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2671 			NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2672 		if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2673 			ret = -EFAULT;
2674 			goto out;
2675 		}
2676 		*len = strlen(buf)+1;
2677 	}
2678 	break;
2679 
2680 	case IP_VS_SO_GET_INFO:
2681 	{
2682 		struct ip_vs_getinfo info;
2683 		info.version = IP_VS_VERSION_CODE;
2684 		info.size = ip_vs_conn_tab_size;
2685 		info.num_services = ipvs->num_services;
2686 		if (copy_to_user(user, &info, sizeof(info)) != 0)
2687 			ret = -EFAULT;
2688 	}
2689 	break;
2690 
2691 	case IP_VS_SO_GET_SERVICES:
2692 	{
2693 		struct ip_vs_get_services *get;
2694 		int size;
2695 
2696 		get = (struct ip_vs_get_services *)arg;
2697 		size = sizeof(*get) +
2698 			sizeof(struct ip_vs_service_entry) * get->num_services;
2699 		if (*len != size) {
2700 			pr_err("length: %u != %u\n", *len, size);
2701 			ret = -EINVAL;
2702 			goto out;
2703 		}
2704 		ret = __ip_vs_get_service_entries(net, get, user);
2705 	}
2706 	break;
2707 
2708 	case IP_VS_SO_GET_SERVICE:
2709 	{
2710 		struct ip_vs_service_entry *entry;
2711 		struct ip_vs_service *svc;
2712 		union nf_inet_addr addr;
2713 
2714 		entry = (struct ip_vs_service_entry *)arg;
2715 		addr.ip = entry->addr;
2716 		rcu_read_lock();
2717 		if (entry->fwmark)
2718 			svc = __ip_vs_svc_fwm_find(net, AF_INET, entry->fwmark);
2719 		else
2720 			svc = __ip_vs_service_find(net, AF_INET,
2721 						   entry->protocol, &addr,
2722 						   entry->port);
2723 		rcu_read_unlock();
2724 		if (svc) {
2725 			ip_vs_copy_service(entry, svc);
2726 			if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2727 				ret = -EFAULT;
2728 		} else
2729 			ret = -ESRCH;
2730 	}
2731 	break;
2732 
2733 	case IP_VS_SO_GET_DESTS:
2734 	{
2735 		struct ip_vs_get_dests *get;
2736 		int size;
2737 
2738 		get = (struct ip_vs_get_dests *)arg;
2739 		size = sizeof(*get) +
2740 			sizeof(struct ip_vs_dest_entry) * get->num_dests;
2741 		if (*len != size) {
2742 			pr_err("length: %u != %u\n", *len, size);
2743 			ret = -EINVAL;
2744 			goto out;
2745 		}
2746 		ret = __ip_vs_get_dest_entries(net, get, user);
2747 	}
2748 	break;
2749 
2750 	case IP_VS_SO_GET_TIMEOUT:
2751 	{
2752 		struct ip_vs_timeout_user t;
2753 
2754 		__ip_vs_get_timeouts(net, &t);
2755 		if (copy_to_user(user, &t, sizeof(t)) != 0)
2756 			ret = -EFAULT;
2757 	}
2758 	break;
2759 
2760 	default:
2761 		ret = -EINVAL;
2762 	}
2763 
2764 out:
2765 	mutex_unlock(&__ip_vs_mutex);
2766 	return ret;
2767 }
2768 
2769 
2770 static struct nf_sockopt_ops ip_vs_sockopts = {
2771 	.pf		= PF_INET,
2772 	.set_optmin	= IP_VS_BASE_CTL,
2773 	.set_optmax	= IP_VS_SO_SET_MAX+1,
2774 	.set		= do_ip_vs_set_ctl,
2775 	.get_optmin	= IP_VS_BASE_CTL,
2776 	.get_optmax	= IP_VS_SO_GET_MAX+1,
2777 	.get		= do_ip_vs_get_ctl,
2778 	.owner		= THIS_MODULE,
2779 };
2780 
2781 /*
2782  * Generic Netlink interface
2783  */
2784 
2785 /* IPVS genetlink family */
2786 static struct genl_family ip_vs_genl_family = {
2787 	.id		= GENL_ID_GENERATE,
2788 	.hdrsize	= 0,
2789 	.name		= IPVS_GENL_NAME,
2790 	.version	= IPVS_GENL_VERSION,
2791 	.maxattr	= IPVS_CMD_MAX,
2792 	.netnsok        = true,         /* Make ipvsadm to work on netns */
2793 };
2794 
2795 /* Policy used for first-level command attributes */
2796 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2797 	[IPVS_CMD_ATTR_SERVICE]		= { .type = NLA_NESTED },
2798 	[IPVS_CMD_ATTR_DEST]		= { .type = NLA_NESTED },
2799 	[IPVS_CMD_ATTR_DAEMON]		= { .type = NLA_NESTED },
2800 	[IPVS_CMD_ATTR_TIMEOUT_TCP]	= { .type = NLA_U32 },
2801 	[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]	= { .type = NLA_U32 },
2802 	[IPVS_CMD_ATTR_TIMEOUT_UDP]	= { .type = NLA_U32 },
2803 };
2804 
2805 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2806 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2807 	[IPVS_DAEMON_ATTR_STATE]	= { .type = NLA_U32 },
2808 	[IPVS_DAEMON_ATTR_MCAST_IFN]	= { .type = NLA_NUL_STRING,
2809 					    .len = IP_VS_IFNAME_MAXLEN },
2810 	[IPVS_DAEMON_ATTR_SYNC_ID]	= { .type = NLA_U32 },
2811 };
2812 
2813 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2814 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2815 	[IPVS_SVC_ATTR_AF]		= { .type = NLA_U16 },
2816 	[IPVS_SVC_ATTR_PROTOCOL]	= { .type = NLA_U16 },
2817 	[IPVS_SVC_ATTR_ADDR]		= { .type = NLA_BINARY,
2818 					    .len = sizeof(union nf_inet_addr) },
2819 	[IPVS_SVC_ATTR_PORT]		= { .type = NLA_U16 },
2820 	[IPVS_SVC_ATTR_FWMARK]		= { .type = NLA_U32 },
2821 	[IPVS_SVC_ATTR_SCHED_NAME]	= { .type = NLA_NUL_STRING,
2822 					    .len = IP_VS_SCHEDNAME_MAXLEN },
2823 	[IPVS_SVC_ATTR_PE_NAME]		= { .type = NLA_NUL_STRING,
2824 					    .len = IP_VS_PENAME_MAXLEN },
2825 	[IPVS_SVC_ATTR_FLAGS]		= { .type = NLA_BINARY,
2826 					    .len = sizeof(struct ip_vs_flags) },
2827 	[IPVS_SVC_ATTR_TIMEOUT]		= { .type = NLA_U32 },
2828 	[IPVS_SVC_ATTR_NETMASK]		= { .type = NLA_U32 },
2829 	[IPVS_SVC_ATTR_STATS]		= { .type = NLA_NESTED },
2830 };
2831 
2832 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2833 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2834 	[IPVS_DEST_ATTR_ADDR]		= { .type = NLA_BINARY,
2835 					    .len = sizeof(union nf_inet_addr) },
2836 	[IPVS_DEST_ATTR_PORT]		= { .type = NLA_U16 },
2837 	[IPVS_DEST_ATTR_FWD_METHOD]	= { .type = NLA_U32 },
2838 	[IPVS_DEST_ATTR_WEIGHT]		= { .type = NLA_U32 },
2839 	[IPVS_DEST_ATTR_U_THRESH]	= { .type = NLA_U32 },
2840 	[IPVS_DEST_ATTR_L_THRESH]	= { .type = NLA_U32 },
2841 	[IPVS_DEST_ATTR_ACTIVE_CONNS]	= { .type = NLA_U32 },
2842 	[IPVS_DEST_ATTR_INACT_CONNS]	= { .type = NLA_U32 },
2843 	[IPVS_DEST_ATTR_PERSIST_CONNS]	= { .type = NLA_U32 },
2844 	[IPVS_DEST_ATTR_STATS]		= { .type = NLA_NESTED },
2845 	[IPVS_DEST_ATTR_ADDR_FAMILY]	= { .type = NLA_U16 },
2846 };
2847 
ip_vs_genl_fill_stats(struct sk_buff * skb,int container_type,struct ip_vs_kstats * kstats)2848 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2849 				 struct ip_vs_kstats *kstats)
2850 {
2851 	struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2852 
2853 	if (!nl_stats)
2854 		return -EMSGSIZE;
2855 
2856 	if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, (u32)kstats->conns) ||
2857 	    nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, (u32)kstats->inpkts) ||
2858 	    nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, (u32)kstats->outpkts) ||
2859 	    nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes) ||
2860 	    nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes) ||
2861 	    nla_put_u32(skb, IPVS_STATS_ATTR_CPS, (u32)kstats->cps) ||
2862 	    nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, (u32)kstats->inpps) ||
2863 	    nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, (u32)kstats->outpps) ||
2864 	    nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, (u32)kstats->inbps) ||
2865 	    nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, (u32)kstats->outbps))
2866 		goto nla_put_failure;
2867 	nla_nest_end(skb, nl_stats);
2868 
2869 	return 0;
2870 
2871 nla_put_failure:
2872 	nla_nest_cancel(skb, nl_stats);
2873 	return -EMSGSIZE;
2874 }
2875 
ip_vs_genl_fill_stats64(struct sk_buff * skb,int container_type,struct ip_vs_kstats * kstats)2876 static int ip_vs_genl_fill_stats64(struct sk_buff *skb, int container_type,
2877 				   struct ip_vs_kstats *kstats)
2878 {
2879 	struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2880 
2881 	if (!nl_stats)
2882 		return -EMSGSIZE;
2883 
2884 	if (nla_put_u64(skb, IPVS_STATS_ATTR_CONNS, kstats->conns) ||
2885 	    nla_put_u64(skb, IPVS_STATS_ATTR_INPKTS, kstats->inpkts) ||
2886 	    nla_put_u64(skb, IPVS_STATS_ATTR_OUTPKTS, kstats->outpkts) ||
2887 	    nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes) ||
2888 	    nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes) ||
2889 	    nla_put_u64(skb, IPVS_STATS_ATTR_CPS, kstats->cps) ||
2890 	    nla_put_u64(skb, IPVS_STATS_ATTR_INPPS, kstats->inpps) ||
2891 	    nla_put_u64(skb, IPVS_STATS_ATTR_OUTPPS, kstats->outpps) ||
2892 	    nla_put_u64(skb, IPVS_STATS_ATTR_INBPS, kstats->inbps) ||
2893 	    nla_put_u64(skb, IPVS_STATS_ATTR_OUTBPS, kstats->outbps))
2894 		goto nla_put_failure;
2895 	nla_nest_end(skb, nl_stats);
2896 
2897 	return 0;
2898 
2899 nla_put_failure:
2900 	nla_nest_cancel(skb, nl_stats);
2901 	return -EMSGSIZE;
2902 }
2903 
ip_vs_genl_fill_service(struct sk_buff * skb,struct ip_vs_service * svc)2904 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2905 				   struct ip_vs_service *svc)
2906 {
2907 	struct ip_vs_scheduler *sched;
2908 	struct ip_vs_pe *pe;
2909 	struct nlattr *nl_service;
2910 	struct ip_vs_flags flags = { .flags = svc->flags,
2911 				     .mask = ~0 };
2912 	struct ip_vs_kstats kstats;
2913 	char *sched_name;
2914 
2915 	nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2916 	if (!nl_service)
2917 		return -EMSGSIZE;
2918 
2919 	if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
2920 		goto nla_put_failure;
2921 	if (svc->fwmark) {
2922 		if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
2923 			goto nla_put_failure;
2924 	} else {
2925 		if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
2926 		    nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
2927 		    nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
2928 			goto nla_put_failure;
2929 	}
2930 
2931 	sched = rcu_dereference_protected(svc->scheduler, 1);
2932 	sched_name = sched ? sched->name : "none";
2933 	pe = rcu_dereference_protected(svc->pe, 1);
2934 	if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched_name) ||
2935 	    (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
2936 	    nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
2937 	    nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
2938 	    nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
2939 		goto nla_put_failure;
2940 	ip_vs_copy_stats(&kstats, &svc->stats);
2941 	if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &kstats))
2942 		goto nla_put_failure;
2943 	if (ip_vs_genl_fill_stats64(skb, IPVS_SVC_ATTR_STATS64, &kstats))
2944 		goto nla_put_failure;
2945 
2946 	nla_nest_end(skb, nl_service);
2947 
2948 	return 0;
2949 
2950 nla_put_failure:
2951 	nla_nest_cancel(skb, nl_service);
2952 	return -EMSGSIZE;
2953 }
2954 
ip_vs_genl_dump_service(struct sk_buff * skb,struct ip_vs_service * svc,struct netlink_callback * cb)2955 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2956 				   struct ip_vs_service *svc,
2957 				   struct netlink_callback *cb)
2958 {
2959 	void *hdr;
2960 
2961 	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2962 			  &ip_vs_genl_family, NLM_F_MULTI,
2963 			  IPVS_CMD_NEW_SERVICE);
2964 	if (!hdr)
2965 		return -EMSGSIZE;
2966 
2967 	if (ip_vs_genl_fill_service(skb, svc) < 0)
2968 		goto nla_put_failure;
2969 
2970 	genlmsg_end(skb, hdr);
2971 	return 0;
2972 
2973 nla_put_failure:
2974 	genlmsg_cancel(skb, hdr);
2975 	return -EMSGSIZE;
2976 }
2977 
ip_vs_genl_dump_services(struct sk_buff * skb,struct netlink_callback * cb)2978 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2979 				    struct netlink_callback *cb)
2980 {
2981 	int idx = 0, i;
2982 	int start = cb->args[0];
2983 	struct ip_vs_service *svc;
2984 	struct net *net = skb_sknet(skb);
2985 
2986 	mutex_lock(&__ip_vs_mutex);
2987 	for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2988 		hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
2989 			if (++idx <= start || !net_eq(svc->net, net))
2990 				continue;
2991 			if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2992 				idx--;
2993 				goto nla_put_failure;
2994 			}
2995 		}
2996 	}
2997 
2998 	for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2999 		hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
3000 			if (++idx <= start || !net_eq(svc->net, net))
3001 				continue;
3002 			if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3003 				idx--;
3004 				goto nla_put_failure;
3005 			}
3006 		}
3007 	}
3008 
3009 nla_put_failure:
3010 	mutex_unlock(&__ip_vs_mutex);
3011 	cb->args[0] = idx;
3012 
3013 	return skb->len;
3014 }
3015 
ip_vs_genl_parse_service(struct net * net,struct ip_vs_service_user_kern * usvc,struct nlattr * nla,int full_entry,struct ip_vs_service ** ret_svc)3016 static int ip_vs_genl_parse_service(struct net *net,
3017 				    struct ip_vs_service_user_kern *usvc,
3018 				    struct nlattr *nla, int full_entry,
3019 				    struct ip_vs_service **ret_svc)
3020 {
3021 	struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3022 	struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3023 	struct ip_vs_service *svc;
3024 
3025 	/* Parse mandatory identifying service fields first */
3026 	if (nla == NULL ||
3027 	    nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
3028 		return -EINVAL;
3029 
3030 	nla_af		= attrs[IPVS_SVC_ATTR_AF];
3031 	nla_protocol	= attrs[IPVS_SVC_ATTR_PROTOCOL];
3032 	nla_addr	= attrs[IPVS_SVC_ATTR_ADDR];
3033 	nla_port	= attrs[IPVS_SVC_ATTR_PORT];
3034 	nla_fwmark	= attrs[IPVS_SVC_ATTR_FWMARK];
3035 
3036 	if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3037 		return -EINVAL;
3038 
3039 	memset(usvc, 0, sizeof(*usvc));
3040 
3041 	usvc->af = nla_get_u16(nla_af);
3042 #ifdef CONFIG_IP_VS_IPV6
3043 	if (usvc->af != AF_INET && usvc->af != AF_INET6)
3044 #else
3045 	if (usvc->af != AF_INET)
3046 #endif
3047 		return -EAFNOSUPPORT;
3048 
3049 	if (nla_fwmark) {
3050 		usvc->protocol = IPPROTO_TCP;
3051 		usvc->fwmark = nla_get_u32(nla_fwmark);
3052 	} else {
3053 		usvc->protocol = nla_get_u16(nla_protocol);
3054 		nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3055 		usvc->port = nla_get_be16(nla_port);
3056 		usvc->fwmark = 0;
3057 	}
3058 
3059 	rcu_read_lock();
3060 	if (usvc->fwmark)
3061 		svc = __ip_vs_svc_fwm_find(net, usvc->af, usvc->fwmark);
3062 	else
3063 		svc = __ip_vs_service_find(net, usvc->af, usvc->protocol,
3064 					   &usvc->addr, usvc->port);
3065 	rcu_read_unlock();
3066 	*ret_svc = svc;
3067 
3068 	/* If a full entry was requested, check for the additional fields */
3069 	if (full_entry) {
3070 		struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3071 			      *nla_netmask;
3072 		struct ip_vs_flags flags;
3073 
3074 		nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3075 		nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3076 		nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3077 		nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3078 		nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3079 
3080 		if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3081 			return -EINVAL;
3082 
3083 		nla_memcpy(&flags, nla_flags, sizeof(flags));
3084 
3085 		/* prefill flags from service if it already exists */
3086 		if (svc)
3087 			usvc->flags = svc->flags;
3088 
3089 		/* set new flags from userland */
3090 		usvc->flags = (usvc->flags & ~flags.mask) |
3091 			      (flags.flags & flags.mask);
3092 		usvc->sched_name = nla_data(nla_sched);
3093 		usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3094 		usvc->timeout = nla_get_u32(nla_timeout);
3095 		usvc->netmask = nla_get_be32(nla_netmask);
3096 	}
3097 
3098 	return 0;
3099 }
3100 
ip_vs_genl_find_service(struct net * net,struct nlattr * nla)3101 static struct ip_vs_service *ip_vs_genl_find_service(struct net *net,
3102 						     struct nlattr *nla)
3103 {
3104 	struct ip_vs_service_user_kern usvc;
3105 	struct ip_vs_service *svc;
3106 	int ret;
3107 
3108 	ret = ip_vs_genl_parse_service(net, &usvc, nla, 0, &svc);
3109 	return ret ? ERR_PTR(ret) : svc;
3110 }
3111 
ip_vs_genl_fill_dest(struct sk_buff * skb,struct ip_vs_dest * dest)3112 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3113 {
3114 	struct nlattr *nl_dest;
3115 	struct ip_vs_kstats kstats;
3116 
3117 	nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3118 	if (!nl_dest)
3119 		return -EMSGSIZE;
3120 
3121 	if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3122 	    nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3123 	    nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3124 			(atomic_read(&dest->conn_flags) &
3125 			 IP_VS_CONN_F_FWD_MASK)) ||
3126 	    nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3127 			atomic_read(&dest->weight)) ||
3128 	    nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3129 	    nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3130 	    nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3131 			atomic_read(&dest->activeconns)) ||
3132 	    nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3133 			atomic_read(&dest->inactconns)) ||
3134 	    nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3135 			atomic_read(&dest->persistconns)) ||
3136 	    nla_put_u16(skb, IPVS_DEST_ATTR_ADDR_FAMILY, dest->af))
3137 		goto nla_put_failure;
3138 	ip_vs_copy_stats(&kstats, &dest->stats);
3139 	if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &kstats))
3140 		goto nla_put_failure;
3141 	if (ip_vs_genl_fill_stats64(skb, IPVS_DEST_ATTR_STATS64, &kstats))
3142 		goto nla_put_failure;
3143 
3144 	nla_nest_end(skb, nl_dest);
3145 
3146 	return 0;
3147 
3148 nla_put_failure:
3149 	nla_nest_cancel(skb, nl_dest);
3150 	return -EMSGSIZE;
3151 }
3152 
ip_vs_genl_dump_dest(struct sk_buff * skb,struct ip_vs_dest * dest,struct netlink_callback * cb)3153 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3154 				struct netlink_callback *cb)
3155 {
3156 	void *hdr;
3157 
3158 	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3159 			  &ip_vs_genl_family, NLM_F_MULTI,
3160 			  IPVS_CMD_NEW_DEST);
3161 	if (!hdr)
3162 		return -EMSGSIZE;
3163 
3164 	if (ip_vs_genl_fill_dest(skb, dest) < 0)
3165 		goto nla_put_failure;
3166 
3167 	genlmsg_end(skb, hdr);
3168 	return 0;
3169 
3170 nla_put_failure:
3171 	genlmsg_cancel(skb, hdr);
3172 	return -EMSGSIZE;
3173 }
3174 
ip_vs_genl_dump_dests(struct sk_buff * skb,struct netlink_callback * cb)3175 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3176 				 struct netlink_callback *cb)
3177 {
3178 	int idx = 0;
3179 	int start = cb->args[0];
3180 	struct ip_vs_service *svc;
3181 	struct ip_vs_dest *dest;
3182 	struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3183 	struct net *net = skb_sknet(skb);
3184 
3185 	mutex_lock(&__ip_vs_mutex);
3186 
3187 	/* Try to find the service for which to dump destinations */
3188 	if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3189 			IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3190 		goto out_err;
3191 
3192 
3193 	svc = ip_vs_genl_find_service(net, attrs[IPVS_CMD_ATTR_SERVICE]);
3194 	if (IS_ERR(svc) || svc == NULL)
3195 		goto out_err;
3196 
3197 	/* Dump the destinations */
3198 	list_for_each_entry(dest, &svc->destinations, n_list) {
3199 		if (++idx <= start)
3200 			continue;
3201 		if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3202 			idx--;
3203 			goto nla_put_failure;
3204 		}
3205 	}
3206 
3207 nla_put_failure:
3208 	cb->args[0] = idx;
3209 
3210 out_err:
3211 	mutex_unlock(&__ip_vs_mutex);
3212 
3213 	return skb->len;
3214 }
3215 
ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern * udest,struct nlattr * nla,int full_entry)3216 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3217 				 struct nlattr *nla, int full_entry)
3218 {
3219 	struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3220 	struct nlattr *nla_addr, *nla_port;
3221 	struct nlattr *nla_addr_family;
3222 
3223 	/* Parse mandatory identifying destination fields first */
3224 	if (nla == NULL ||
3225 	    nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3226 		return -EINVAL;
3227 
3228 	nla_addr	= attrs[IPVS_DEST_ATTR_ADDR];
3229 	nla_port	= attrs[IPVS_DEST_ATTR_PORT];
3230 	nla_addr_family	= attrs[IPVS_DEST_ATTR_ADDR_FAMILY];
3231 
3232 	if (!(nla_addr && nla_port))
3233 		return -EINVAL;
3234 
3235 	memset(udest, 0, sizeof(*udest));
3236 
3237 	nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3238 	udest->port = nla_get_be16(nla_port);
3239 
3240 	if (nla_addr_family)
3241 		udest->af = nla_get_u16(nla_addr_family);
3242 	else
3243 		udest->af = 0;
3244 
3245 	/* If a full entry was requested, check for the additional fields */
3246 	if (full_entry) {
3247 		struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3248 			      *nla_l_thresh;
3249 
3250 		nla_fwd		= attrs[IPVS_DEST_ATTR_FWD_METHOD];
3251 		nla_weight	= attrs[IPVS_DEST_ATTR_WEIGHT];
3252 		nla_u_thresh	= attrs[IPVS_DEST_ATTR_U_THRESH];
3253 		nla_l_thresh	= attrs[IPVS_DEST_ATTR_L_THRESH];
3254 
3255 		if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3256 			return -EINVAL;
3257 
3258 		udest->conn_flags = nla_get_u32(nla_fwd)
3259 				    & IP_VS_CONN_F_FWD_MASK;
3260 		udest->weight = nla_get_u32(nla_weight);
3261 		udest->u_threshold = nla_get_u32(nla_u_thresh);
3262 		udest->l_threshold = nla_get_u32(nla_l_thresh);
3263 	}
3264 
3265 	return 0;
3266 }
3267 
ip_vs_genl_fill_daemon(struct sk_buff * skb,__u32 state,const char * mcast_ifn,__u32 syncid)3268 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3269 				  const char *mcast_ifn, __u32 syncid)
3270 {
3271 	struct nlattr *nl_daemon;
3272 
3273 	nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3274 	if (!nl_daemon)
3275 		return -EMSGSIZE;
3276 
3277 	if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3278 	    nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn) ||
3279 	    nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid))
3280 		goto nla_put_failure;
3281 	nla_nest_end(skb, nl_daemon);
3282 
3283 	return 0;
3284 
3285 nla_put_failure:
3286 	nla_nest_cancel(skb, nl_daemon);
3287 	return -EMSGSIZE;
3288 }
3289 
ip_vs_genl_dump_daemon(struct sk_buff * skb,__u32 state,const char * mcast_ifn,__u32 syncid,struct netlink_callback * cb)3290 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3291 				  const char *mcast_ifn, __u32 syncid,
3292 				  struct netlink_callback *cb)
3293 {
3294 	void *hdr;
3295 	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3296 			  &ip_vs_genl_family, NLM_F_MULTI,
3297 			  IPVS_CMD_NEW_DAEMON);
3298 	if (!hdr)
3299 		return -EMSGSIZE;
3300 
3301 	if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
3302 		goto nla_put_failure;
3303 
3304 	genlmsg_end(skb, hdr);
3305 	return 0;
3306 
3307 nla_put_failure:
3308 	genlmsg_cancel(skb, hdr);
3309 	return -EMSGSIZE;
3310 }
3311 
ip_vs_genl_dump_daemons(struct sk_buff * skb,struct netlink_callback * cb)3312 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3313 				   struct netlink_callback *cb)
3314 {
3315 	struct net *net = skb_sknet(skb);
3316 	struct netns_ipvs *ipvs = net_ipvs(net);
3317 
3318 	mutex_lock(&ipvs->sync_mutex);
3319 	if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3320 		if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3321 					   ipvs->master_mcast_ifn,
3322 					   ipvs->master_syncid, cb) < 0)
3323 			goto nla_put_failure;
3324 
3325 		cb->args[0] = 1;
3326 	}
3327 
3328 	if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3329 		if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3330 					   ipvs->backup_mcast_ifn,
3331 					   ipvs->backup_syncid, cb) < 0)
3332 			goto nla_put_failure;
3333 
3334 		cb->args[1] = 1;
3335 	}
3336 
3337 nla_put_failure:
3338 	mutex_unlock(&ipvs->sync_mutex);
3339 
3340 	return skb->len;
3341 }
3342 
ip_vs_genl_new_daemon(struct net * net,struct nlattr ** attrs)3343 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
3344 {
3345 	if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3346 	      attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3347 	      attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3348 		return -EINVAL;
3349 
3350 	/* The synchronization protocol is incompatible with mixed family
3351 	 * services
3352 	 */
3353 	if (net_ipvs(net)->mixed_address_family_dests > 0)
3354 		return -EINVAL;
3355 
3356 	return start_sync_thread(net,
3357 				 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
3358 				 nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3359 				 nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
3360 }
3361 
ip_vs_genl_del_daemon(struct net * net,struct nlattr ** attrs)3362 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
3363 {
3364 	if (!attrs[IPVS_DAEMON_ATTR_STATE])
3365 		return -EINVAL;
3366 
3367 	return stop_sync_thread(net,
3368 				nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3369 }
3370 
ip_vs_genl_set_config(struct net * net,struct nlattr ** attrs)3371 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
3372 {
3373 	struct ip_vs_timeout_user t;
3374 
3375 	__ip_vs_get_timeouts(net, &t);
3376 
3377 	if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3378 		t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3379 
3380 	if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3381 		t.tcp_fin_timeout =
3382 			nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3383 
3384 	if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3385 		t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3386 
3387 	return ip_vs_set_timeout(net, &t);
3388 }
3389 
ip_vs_genl_set_daemon(struct sk_buff * skb,struct genl_info * info)3390 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3391 {
3392 	int ret = 0, cmd;
3393 	struct net *net;
3394 	struct netns_ipvs *ipvs;
3395 
3396 	net = skb_sknet(skb);
3397 	ipvs = net_ipvs(net);
3398 	cmd = info->genlhdr->cmd;
3399 
3400 	if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3401 		struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3402 
3403 		mutex_lock(&ipvs->sync_mutex);
3404 		if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3405 		    nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3406 				     info->attrs[IPVS_CMD_ATTR_DAEMON],
3407 				     ip_vs_daemon_policy)) {
3408 			ret = -EINVAL;
3409 			goto out;
3410 		}
3411 
3412 		if (cmd == IPVS_CMD_NEW_DAEMON)
3413 			ret = ip_vs_genl_new_daemon(net, daemon_attrs);
3414 		else
3415 			ret = ip_vs_genl_del_daemon(net, daemon_attrs);
3416 out:
3417 		mutex_unlock(&ipvs->sync_mutex);
3418 	}
3419 	return ret;
3420 }
3421 
ip_vs_genl_set_cmd(struct sk_buff * skb,struct genl_info * info)3422 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3423 {
3424 	struct ip_vs_service *svc = NULL;
3425 	struct ip_vs_service_user_kern usvc;
3426 	struct ip_vs_dest_user_kern udest;
3427 	int ret = 0, cmd;
3428 	int need_full_svc = 0, need_full_dest = 0;
3429 	struct net *net;
3430 
3431 	net = skb_sknet(skb);
3432 	cmd = info->genlhdr->cmd;
3433 
3434 	mutex_lock(&__ip_vs_mutex);
3435 
3436 	if (cmd == IPVS_CMD_FLUSH) {
3437 		ret = ip_vs_flush(net, false);
3438 		goto out;
3439 	} else if (cmd == IPVS_CMD_SET_CONFIG) {
3440 		ret = ip_vs_genl_set_config(net, info->attrs);
3441 		goto out;
3442 	} else if (cmd == IPVS_CMD_ZERO &&
3443 		   !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3444 		ret = ip_vs_zero_all(net);
3445 		goto out;
3446 	}
3447 
3448 	/* All following commands require a service argument, so check if we
3449 	 * received a valid one. We need a full service specification when
3450 	 * adding / editing a service. Only identifying members otherwise. */
3451 	if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3452 		need_full_svc = 1;
3453 
3454 	ret = ip_vs_genl_parse_service(net, &usvc,
3455 				       info->attrs[IPVS_CMD_ATTR_SERVICE],
3456 				       need_full_svc, &svc);
3457 	if (ret)
3458 		goto out;
3459 
3460 	/* Unless we're adding a new service, the service must already exist */
3461 	if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3462 		ret = -ESRCH;
3463 		goto out;
3464 	}
3465 
3466 	/* Destination commands require a valid destination argument. For
3467 	 * adding / editing a destination, we need a full destination
3468 	 * specification. */
3469 	if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3470 	    cmd == IPVS_CMD_DEL_DEST) {
3471 		if (cmd != IPVS_CMD_DEL_DEST)
3472 			need_full_dest = 1;
3473 
3474 		ret = ip_vs_genl_parse_dest(&udest,
3475 					    info->attrs[IPVS_CMD_ATTR_DEST],
3476 					    need_full_dest);
3477 		if (ret)
3478 			goto out;
3479 
3480 		/* Old protocols did not allow the user to specify address
3481 		 * family, so we set it to zero instead.  We also didn't
3482 		 * allow heterogeneous pools in the old code, so it's safe
3483 		 * to assume that this will have the same address family as
3484 		 * the service.
3485 		 */
3486 		if (udest.af == 0)
3487 			udest.af = svc->af;
3488 
3489 		if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) {
3490 			/* The synchronization protocol is incompatible
3491 			 * with mixed family services
3492 			 */
3493 			if (net_ipvs(net)->sync_state) {
3494 				ret = -EINVAL;
3495 				goto out;
3496 			}
3497 
3498 			/* Which connection types do we support? */
3499 			switch (udest.conn_flags) {
3500 			case IP_VS_CONN_F_TUNNEL:
3501 				/* We are able to forward this */
3502 				break;
3503 			default:
3504 				ret = -EINVAL;
3505 				goto out;
3506 			}
3507 		}
3508 	}
3509 
3510 	switch (cmd) {
3511 	case IPVS_CMD_NEW_SERVICE:
3512 		if (svc == NULL)
3513 			ret = ip_vs_add_service(net, &usvc, &svc);
3514 		else
3515 			ret = -EEXIST;
3516 		break;
3517 	case IPVS_CMD_SET_SERVICE:
3518 		ret = ip_vs_edit_service(svc, &usvc);
3519 		break;
3520 	case IPVS_CMD_DEL_SERVICE:
3521 		ret = ip_vs_del_service(svc);
3522 		/* do not use svc, it can be freed */
3523 		break;
3524 	case IPVS_CMD_NEW_DEST:
3525 		ret = ip_vs_add_dest(svc, &udest);
3526 		break;
3527 	case IPVS_CMD_SET_DEST:
3528 		ret = ip_vs_edit_dest(svc, &udest);
3529 		break;
3530 	case IPVS_CMD_DEL_DEST:
3531 		ret = ip_vs_del_dest(svc, &udest);
3532 		break;
3533 	case IPVS_CMD_ZERO:
3534 		ret = ip_vs_zero_service(svc);
3535 		break;
3536 	default:
3537 		ret = -EINVAL;
3538 	}
3539 
3540 out:
3541 	mutex_unlock(&__ip_vs_mutex);
3542 
3543 	return ret;
3544 }
3545 
ip_vs_genl_get_cmd(struct sk_buff * skb,struct genl_info * info)3546 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3547 {
3548 	struct sk_buff *msg;
3549 	void *reply;
3550 	int ret, cmd, reply_cmd;
3551 	struct net *net;
3552 
3553 	net = skb_sknet(skb);
3554 	cmd = info->genlhdr->cmd;
3555 
3556 	if (cmd == IPVS_CMD_GET_SERVICE)
3557 		reply_cmd = IPVS_CMD_NEW_SERVICE;
3558 	else if (cmd == IPVS_CMD_GET_INFO)
3559 		reply_cmd = IPVS_CMD_SET_INFO;
3560 	else if (cmd == IPVS_CMD_GET_CONFIG)
3561 		reply_cmd = IPVS_CMD_SET_CONFIG;
3562 	else {
3563 		pr_err("unknown Generic Netlink command\n");
3564 		return -EINVAL;
3565 	}
3566 
3567 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3568 	if (!msg)
3569 		return -ENOMEM;
3570 
3571 	mutex_lock(&__ip_vs_mutex);
3572 
3573 	reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3574 	if (reply == NULL)
3575 		goto nla_put_failure;
3576 
3577 	switch (cmd) {
3578 	case IPVS_CMD_GET_SERVICE:
3579 	{
3580 		struct ip_vs_service *svc;
3581 
3582 		svc = ip_vs_genl_find_service(net,
3583 					      info->attrs[IPVS_CMD_ATTR_SERVICE]);
3584 		if (IS_ERR(svc)) {
3585 			ret = PTR_ERR(svc);
3586 			goto out_err;
3587 		} else if (svc) {
3588 			ret = ip_vs_genl_fill_service(msg, svc);
3589 			if (ret)
3590 				goto nla_put_failure;
3591 		} else {
3592 			ret = -ESRCH;
3593 			goto out_err;
3594 		}
3595 
3596 		break;
3597 	}
3598 
3599 	case IPVS_CMD_GET_CONFIG:
3600 	{
3601 		struct ip_vs_timeout_user t;
3602 
3603 		__ip_vs_get_timeouts(net, &t);
3604 #ifdef CONFIG_IP_VS_PROTO_TCP
3605 		if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3606 				t.tcp_timeout) ||
3607 		    nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3608 				t.tcp_fin_timeout))
3609 			goto nla_put_failure;
3610 #endif
3611 #ifdef CONFIG_IP_VS_PROTO_UDP
3612 		if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3613 			goto nla_put_failure;
3614 #endif
3615 
3616 		break;
3617 	}
3618 
3619 	case IPVS_CMD_GET_INFO:
3620 		if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3621 				IP_VS_VERSION_CODE) ||
3622 		    nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3623 				ip_vs_conn_tab_size))
3624 			goto nla_put_failure;
3625 		break;
3626 	}
3627 
3628 	genlmsg_end(msg, reply);
3629 	ret = genlmsg_reply(msg, info);
3630 	goto out;
3631 
3632 nla_put_failure:
3633 	pr_err("not enough space in Netlink message\n");
3634 	ret = -EMSGSIZE;
3635 
3636 out_err:
3637 	nlmsg_free(msg);
3638 out:
3639 	mutex_unlock(&__ip_vs_mutex);
3640 
3641 	return ret;
3642 }
3643 
3644 
3645 static const struct genl_ops ip_vs_genl_ops[] = {
3646 	{
3647 		.cmd	= IPVS_CMD_NEW_SERVICE,
3648 		.flags	= GENL_ADMIN_PERM,
3649 		.policy	= ip_vs_cmd_policy,
3650 		.doit	= ip_vs_genl_set_cmd,
3651 	},
3652 	{
3653 		.cmd	= IPVS_CMD_SET_SERVICE,
3654 		.flags	= GENL_ADMIN_PERM,
3655 		.policy	= ip_vs_cmd_policy,
3656 		.doit	= ip_vs_genl_set_cmd,
3657 	},
3658 	{
3659 		.cmd	= IPVS_CMD_DEL_SERVICE,
3660 		.flags	= GENL_ADMIN_PERM,
3661 		.policy	= ip_vs_cmd_policy,
3662 		.doit	= ip_vs_genl_set_cmd,
3663 	},
3664 	{
3665 		.cmd	= IPVS_CMD_GET_SERVICE,
3666 		.flags	= GENL_ADMIN_PERM,
3667 		.doit	= ip_vs_genl_get_cmd,
3668 		.dumpit	= ip_vs_genl_dump_services,
3669 		.policy	= ip_vs_cmd_policy,
3670 	},
3671 	{
3672 		.cmd	= IPVS_CMD_NEW_DEST,
3673 		.flags	= GENL_ADMIN_PERM,
3674 		.policy	= ip_vs_cmd_policy,
3675 		.doit	= ip_vs_genl_set_cmd,
3676 	},
3677 	{
3678 		.cmd	= IPVS_CMD_SET_DEST,
3679 		.flags	= GENL_ADMIN_PERM,
3680 		.policy	= ip_vs_cmd_policy,
3681 		.doit	= ip_vs_genl_set_cmd,
3682 	},
3683 	{
3684 		.cmd	= IPVS_CMD_DEL_DEST,
3685 		.flags	= GENL_ADMIN_PERM,
3686 		.policy	= ip_vs_cmd_policy,
3687 		.doit	= ip_vs_genl_set_cmd,
3688 	},
3689 	{
3690 		.cmd	= IPVS_CMD_GET_DEST,
3691 		.flags	= GENL_ADMIN_PERM,
3692 		.policy	= ip_vs_cmd_policy,
3693 		.dumpit	= ip_vs_genl_dump_dests,
3694 	},
3695 	{
3696 		.cmd	= IPVS_CMD_NEW_DAEMON,
3697 		.flags	= GENL_ADMIN_PERM,
3698 		.policy	= ip_vs_cmd_policy,
3699 		.doit	= ip_vs_genl_set_daemon,
3700 	},
3701 	{
3702 		.cmd	= IPVS_CMD_DEL_DAEMON,
3703 		.flags	= GENL_ADMIN_PERM,
3704 		.policy	= ip_vs_cmd_policy,
3705 		.doit	= ip_vs_genl_set_daemon,
3706 	},
3707 	{
3708 		.cmd	= IPVS_CMD_GET_DAEMON,
3709 		.flags	= GENL_ADMIN_PERM,
3710 		.dumpit	= ip_vs_genl_dump_daemons,
3711 	},
3712 	{
3713 		.cmd	= IPVS_CMD_SET_CONFIG,
3714 		.flags	= GENL_ADMIN_PERM,
3715 		.policy	= ip_vs_cmd_policy,
3716 		.doit	= ip_vs_genl_set_cmd,
3717 	},
3718 	{
3719 		.cmd	= IPVS_CMD_GET_CONFIG,
3720 		.flags	= GENL_ADMIN_PERM,
3721 		.doit	= ip_vs_genl_get_cmd,
3722 	},
3723 	{
3724 		.cmd	= IPVS_CMD_GET_INFO,
3725 		.flags	= GENL_ADMIN_PERM,
3726 		.doit	= ip_vs_genl_get_cmd,
3727 	},
3728 	{
3729 		.cmd	= IPVS_CMD_ZERO,
3730 		.flags	= GENL_ADMIN_PERM,
3731 		.policy	= ip_vs_cmd_policy,
3732 		.doit	= ip_vs_genl_set_cmd,
3733 	},
3734 	{
3735 		.cmd	= IPVS_CMD_FLUSH,
3736 		.flags	= GENL_ADMIN_PERM,
3737 		.doit	= ip_vs_genl_set_cmd,
3738 	},
3739 };
3740 
ip_vs_genl_register(void)3741 static int __init ip_vs_genl_register(void)
3742 {
3743 	return genl_register_family_with_ops(&ip_vs_genl_family,
3744 					     ip_vs_genl_ops);
3745 }
3746 
ip_vs_genl_unregister(void)3747 static void ip_vs_genl_unregister(void)
3748 {
3749 	genl_unregister_family(&ip_vs_genl_family);
3750 }
3751 
3752 /* End of Generic Netlink interface definitions */
3753 
3754 /*
3755  * per netns intit/exit func.
3756  */
3757 #ifdef CONFIG_SYSCTL
ip_vs_control_net_init_sysctl(struct net * net)3758 static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
3759 {
3760 	int idx;
3761 	struct netns_ipvs *ipvs = net_ipvs(net);
3762 	struct ctl_table *tbl;
3763 
3764 	atomic_set(&ipvs->dropentry, 0);
3765 	spin_lock_init(&ipvs->dropentry_lock);
3766 	spin_lock_init(&ipvs->droppacket_lock);
3767 	spin_lock_init(&ipvs->securetcp_lock);
3768 
3769 	if (!net_eq(net, &init_net)) {
3770 		tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3771 		if (tbl == NULL)
3772 			return -ENOMEM;
3773 
3774 		/* Don't export sysctls to unprivileged users */
3775 		if (net->user_ns != &init_user_ns)
3776 			tbl[0].procname = NULL;
3777 	} else
3778 		tbl = vs_vars;
3779 	/* Initialize sysctl defaults */
3780 	idx = 0;
3781 	ipvs->sysctl_amemthresh = 1024;
3782 	tbl[idx++].data = &ipvs->sysctl_amemthresh;
3783 	ipvs->sysctl_am_droprate = 10;
3784 	tbl[idx++].data = &ipvs->sysctl_am_droprate;
3785 	tbl[idx++].data = &ipvs->sysctl_drop_entry;
3786 	tbl[idx++].data = &ipvs->sysctl_drop_packet;
3787 #ifdef CONFIG_IP_VS_NFCT
3788 	tbl[idx++].data = &ipvs->sysctl_conntrack;
3789 #endif
3790 	tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3791 	ipvs->sysctl_snat_reroute = 1;
3792 	tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3793 	ipvs->sysctl_sync_ver = 1;
3794 	tbl[idx++].data = &ipvs->sysctl_sync_ver;
3795 	ipvs->sysctl_sync_ports = 1;
3796 	tbl[idx++].data = &ipvs->sysctl_sync_ports;
3797 	tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
3798 	ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
3799 	tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
3800 	ipvs->sysctl_sync_sock_size = 0;
3801 	tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
3802 	tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3803 	tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3804 	tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
3805 	tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
3806 	tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3807 	ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3808 	ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3809 	tbl[idx].data = &ipvs->sysctl_sync_threshold;
3810 	tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3811 	ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
3812 	tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
3813 	ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
3814 	tbl[idx++].data = &ipvs->sysctl_sync_retries;
3815 	tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3816 	ipvs->sysctl_pmtu_disc = 1;
3817 	tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
3818 	tbl[idx++].data = &ipvs->sysctl_backup_only;
3819 	ipvs->sysctl_conn_reuse_mode = 1;
3820 	tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode;
3821 
3822 
3823 	ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
3824 	if (ipvs->sysctl_hdr == NULL) {
3825 		if (!net_eq(net, &init_net))
3826 			kfree(tbl);
3827 		return -ENOMEM;
3828 	}
3829 	ip_vs_start_estimator(net, &ipvs->tot_stats);
3830 	ipvs->sysctl_tbl = tbl;
3831 	/* Schedule defense work */
3832 	INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
3833 	schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
3834 
3835 	return 0;
3836 }
3837 
ip_vs_control_net_cleanup_sysctl(struct net * net)3838 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net)
3839 {
3840 	struct netns_ipvs *ipvs = net_ipvs(net);
3841 
3842 	cancel_delayed_work_sync(&ipvs->defense_work);
3843 	cancel_work_sync(&ipvs->defense_work.work);
3844 	unregister_net_sysctl_table(ipvs->sysctl_hdr);
3845 	ip_vs_stop_estimator(net, &ipvs->tot_stats);
3846 
3847 	if (!net_eq(net, &init_net))
3848 		kfree(ipvs->sysctl_tbl);
3849 }
3850 
3851 #else
3852 
ip_vs_control_net_init_sysctl(struct net * net)3853 static int __net_init ip_vs_control_net_init_sysctl(struct net *net) { return 0; }
ip_vs_control_net_cleanup_sysctl(struct net * net)3854 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net) { }
3855 
3856 #endif
3857 
3858 static struct notifier_block ip_vs_dst_notifier = {
3859 	.notifier_call = ip_vs_dst_event,
3860 };
3861 
ip_vs_control_net_init(struct net * net)3862 int __net_init ip_vs_control_net_init(struct net *net)
3863 {
3864 	int i, idx;
3865 	struct netns_ipvs *ipvs = net_ipvs(net);
3866 
3867 	/* Initialize rs_table */
3868 	for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
3869 		INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
3870 
3871 	INIT_LIST_HEAD(&ipvs->dest_trash);
3872 	spin_lock_init(&ipvs->dest_trash_lock);
3873 	setup_timer(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire,
3874 		    (unsigned long) net);
3875 	atomic_set(&ipvs->ftpsvc_counter, 0);
3876 	atomic_set(&ipvs->nullsvc_counter, 0);
3877 
3878 	/* procfs stats */
3879 	ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
3880 	if (!ipvs->tot_stats.cpustats)
3881 		return -ENOMEM;
3882 
3883 	for_each_possible_cpu(i) {
3884 		struct ip_vs_cpu_stats *ipvs_tot_stats;
3885 		ipvs_tot_stats = per_cpu_ptr(ipvs->tot_stats.cpustats, i);
3886 		u64_stats_init(&ipvs_tot_stats->syncp);
3887 	}
3888 
3889 	spin_lock_init(&ipvs->tot_stats.lock);
3890 
3891 	proc_create("ip_vs", 0, net->proc_net, &ip_vs_info_fops);
3892 	proc_create("ip_vs_stats", 0, net->proc_net, &ip_vs_stats_fops);
3893 	proc_create("ip_vs_stats_percpu", 0, net->proc_net,
3894 		    &ip_vs_stats_percpu_fops);
3895 
3896 	if (ip_vs_control_net_init_sysctl(net))
3897 		goto err;
3898 
3899 	return 0;
3900 
3901 err:
3902 	free_percpu(ipvs->tot_stats.cpustats);
3903 	return -ENOMEM;
3904 }
3905 
ip_vs_control_net_cleanup(struct net * net)3906 void __net_exit ip_vs_control_net_cleanup(struct net *net)
3907 {
3908 	struct netns_ipvs *ipvs = net_ipvs(net);
3909 
3910 	ip_vs_trash_cleanup(net);
3911 	ip_vs_control_net_cleanup_sysctl(net);
3912 	remove_proc_entry("ip_vs_stats_percpu", net->proc_net);
3913 	remove_proc_entry("ip_vs_stats", net->proc_net);
3914 	remove_proc_entry("ip_vs", net->proc_net);
3915 	free_percpu(ipvs->tot_stats.cpustats);
3916 }
3917 
ip_vs_register_nl_ioctl(void)3918 int __init ip_vs_register_nl_ioctl(void)
3919 {
3920 	int ret;
3921 
3922 	ret = nf_register_sockopt(&ip_vs_sockopts);
3923 	if (ret) {
3924 		pr_err("cannot register sockopt.\n");
3925 		goto err_sock;
3926 	}
3927 
3928 	ret = ip_vs_genl_register();
3929 	if (ret) {
3930 		pr_err("cannot register Generic Netlink interface.\n");
3931 		goto err_genl;
3932 	}
3933 	return 0;
3934 
3935 err_genl:
3936 	nf_unregister_sockopt(&ip_vs_sockopts);
3937 err_sock:
3938 	return ret;
3939 }
3940 
ip_vs_unregister_nl_ioctl(void)3941 void ip_vs_unregister_nl_ioctl(void)
3942 {
3943 	ip_vs_genl_unregister();
3944 	nf_unregister_sockopt(&ip_vs_sockopts);
3945 }
3946 
ip_vs_control_init(void)3947 int __init ip_vs_control_init(void)
3948 {
3949 	int idx;
3950 	int ret;
3951 
3952 	EnterFunction(2);
3953 
3954 	/* Initialize svc_table, ip_vs_svc_fwm_table */
3955 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
3956 		INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
3957 		INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
3958 	}
3959 
3960 	smp_wmb();	/* Do we really need it now ? */
3961 
3962 	ret = register_netdevice_notifier(&ip_vs_dst_notifier);
3963 	if (ret < 0)
3964 		return ret;
3965 
3966 	LeaveFunction(2);
3967 	return 0;
3968 }
3969 
3970 
ip_vs_control_cleanup(void)3971 void ip_vs_control_cleanup(void)
3972 {
3973 	EnterFunction(2);
3974 	unregister_netdevice_notifier(&ip_vs_dst_notifier);
3975 	LeaveFunction(2);
3976 }
3977