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Commit | Line | Data |
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1da177e4 LT |
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 | * | |
1da177e4 LT |
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 | * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, | |
18 | * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms | |
19 | * and others. Many code here is taken from IP MASQ code of kernel 2.2. | |
20 | * | |
21 | * Changes: | |
22 | * | |
23 | */ | |
24 | ||
9aada7ac HE |
25 | #define KMSG_COMPONENT "IPVS" |
26 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
27 | ||
e924283b | 28 | #include <linux/interrupt.h> |
14c85021 | 29 | #include <linux/in.h> |
f190055f | 30 | #include <linux/net.h> |
1da177e4 | 31 | #include <linux/kernel.h> |
14c85021 | 32 | #include <linux/module.h> |
1da177e4 LT |
33 | #include <linux/vmalloc.h> |
34 | #include <linux/proc_fs.h> /* for proc_net_* */ | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
1da177e4 LT |
36 | #include <linux/seq_file.h> |
37 | #include <linux/jhash.h> | |
38 | #include <linux/random.h> | |
39 | ||
457c4cbc | 40 | #include <net/net_namespace.h> |
1da177e4 LT |
41 | #include <net/ip_vs.h> |
42 | ||
43 | ||
6f7edb48 CB |
44 | #ifndef CONFIG_IP_VS_TAB_BITS |
45 | #define CONFIG_IP_VS_TAB_BITS 12 | |
46 | #endif | |
47 | ||
48 | /* | |
49 | * Connection hash size. Default is what was selected at compile time. | |
50 | */ | |
51 | int ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS; | |
52 | module_param_named(conn_tab_bits, ip_vs_conn_tab_bits, int, 0444); | |
53 | MODULE_PARM_DESC(conn_tab_bits, "Set connections' hash size"); | |
54 | ||
55 | /* size and mask values */ | |
56 | int ip_vs_conn_tab_size; | |
57 | int ip_vs_conn_tab_mask; | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * Connection hash table: for input and output packets lookups of IPVS | |
61 | */ | |
62 | static struct list_head *ip_vs_conn_tab; | |
63 | ||
64 | /* SLAB cache for IPVS connections */ | |
e18b890b | 65 | static struct kmem_cache *ip_vs_conn_cachep __read_mostly; |
1da177e4 LT |
66 | |
67 | /* counter for current IPVS connections */ | |
68 | static atomic_t ip_vs_conn_count = ATOMIC_INIT(0); | |
69 | ||
70 | /* counter for no client port connections */ | |
71 | static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0); | |
72 | ||
73 | /* random value for IPVS connection hash */ | |
74 | static unsigned int ip_vs_conn_rnd; | |
75 | ||
76 | /* | |
77 | * Fine locking granularity for big connection hash table | |
78 | */ | |
79 | #define CT_LOCKARRAY_BITS 4 | |
80 | #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS) | |
81 | #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1) | |
82 | ||
83 | struct ip_vs_aligned_lock | |
84 | { | |
85 | rwlock_t l; | |
86 | } __attribute__((__aligned__(SMP_CACHE_BYTES))); | |
87 | ||
88 | /* lock array for conn table */ | |
89 | static struct ip_vs_aligned_lock | |
90 | __ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned; | |
91 | ||
92 | static inline void ct_read_lock(unsigned key) | |
93 | { | |
94 | read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
95 | } | |
96 | ||
97 | static inline void ct_read_unlock(unsigned key) | |
98 | { | |
99 | read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
100 | } | |
101 | ||
102 | static inline void ct_write_lock(unsigned key) | |
103 | { | |
104 | write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
105 | } | |
106 | ||
107 | static inline void ct_write_unlock(unsigned key) | |
108 | { | |
109 | write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
110 | } | |
111 | ||
112 | static inline void ct_read_lock_bh(unsigned key) | |
113 | { | |
114 | read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
115 | } | |
116 | ||
117 | static inline void ct_read_unlock_bh(unsigned key) | |
118 | { | |
119 | read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
120 | } | |
121 | ||
122 | static inline void ct_write_lock_bh(unsigned key) | |
123 | { | |
124 | write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
125 | } | |
126 | ||
127 | static inline void ct_write_unlock_bh(unsigned key) | |
128 | { | |
129 | write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
130 | } | |
131 | ||
132 | ||
133 | /* | |
134 | * Returns hash value for IPVS connection entry | |
135 | */ | |
28364a59 JV |
136 | static unsigned int ip_vs_conn_hashkey(int af, unsigned proto, |
137 | const union nf_inet_addr *addr, | |
138 | __be16 port) | |
1da177e4 | 139 | { |
28364a59 JV |
140 | #ifdef CONFIG_IP_VS_IPV6 |
141 | if (af == AF_INET6) | |
142 | return jhash_3words(jhash(addr, 16, ip_vs_conn_rnd), | |
143 | (__force u32)port, proto, ip_vs_conn_rnd) | |
6f7edb48 | 144 | & ip_vs_conn_tab_mask; |
28364a59 JV |
145 | #endif |
146 | return jhash_3words((__force u32)addr->ip, (__force u32)port, proto, | |
147 | ip_vs_conn_rnd) | |
6f7edb48 | 148 | & ip_vs_conn_tab_mask; |
1da177e4 LT |
149 | } |
150 | ||
151 | ||
152 | /* | |
153 | * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port. | |
154 | * returns bool success. | |
155 | */ | |
156 | static inline int ip_vs_conn_hash(struct ip_vs_conn *cp) | |
157 | { | |
158 | unsigned hash; | |
159 | int ret; | |
160 | ||
26ec037f NC |
161 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
162 | return 0; | |
163 | ||
1da177e4 | 164 | /* Hash by protocol, client address and port */ |
28364a59 | 165 | hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport); |
1da177e4 LT |
166 | |
167 | ct_write_lock(hash); | |
aea9d711 | 168 | spin_lock(&cp->lock); |
1da177e4 LT |
169 | |
170 | if (!(cp->flags & IP_VS_CONN_F_HASHED)) { | |
171 | list_add(&cp->c_list, &ip_vs_conn_tab[hash]); | |
172 | cp->flags |= IP_VS_CONN_F_HASHED; | |
173 | atomic_inc(&cp->refcnt); | |
174 | ret = 1; | |
175 | } else { | |
1e3e238e HE |
176 | pr_err("%s(): request for already hashed, called from %pF\n", |
177 | __func__, __builtin_return_address(0)); | |
1da177e4 LT |
178 | ret = 0; |
179 | } | |
180 | ||
aea9d711 | 181 | spin_unlock(&cp->lock); |
1da177e4 LT |
182 | ct_write_unlock(hash); |
183 | ||
184 | return ret; | |
185 | } | |
186 | ||
187 | ||
188 | /* | |
189 | * UNhashes ip_vs_conn from ip_vs_conn_tab. | |
190 | * returns bool success. | |
191 | */ | |
192 | static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp) | |
193 | { | |
194 | unsigned hash; | |
195 | int ret; | |
196 | ||
197 | /* unhash it and decrease its reference counter */ | |
28364a59 | 198 | hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport); |
1da177e4 LT |
199 | |
200 | ct_write_lock(hash); | |
aea9d711 | 201 | spin_lock(&cp->lock); |
1da177e4 LT |
202 | |
203 | if (cp->flags & IP_VS_CONN_F_HASHED) { | |
204 | list_del(&cp->c_list); | |
205 | cp->flags &= ~IP_VS_CONN_F_HASHED; | |
206 | atomic_dec(&cp->refcnt); | |
207 | ret = 1; | |
208 | } else | |
209 | ret = 0; | |
210 | ||
aea9d711 | 211 | spin_unlock(&cp->lock); |
1da177e4 LT |
212 | ct_write_unlock(hash); |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | ||
218 | /* | |
219 | * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. | |
220 | * Called for pkts coming from OUTside-to-INside. | |
221 | * s_addr, s_port: pkt source address (foreign host) | |
222 | * d_addr, d_port: pkt dest address (load balancer) | |
223 | */ | |
224 | static inline struct ip_vs_conn *__ip_vs_conn_in_get | |
28364a59 JV |
225 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
226 | const union nf_inet_addr *d_addr, __be16 d_port) | |
1da177e4 LT |
227 | { |
228 | unsigned hash; | |
229 | struct ip_vs_conn *cp; | |
230 | ||
28364a59 | 231 | hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port); |
1da177e4 LT |
232 | |
233 | ct_read_lock(hash); | |
234 | ||
235 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
28364a59 JV |
236 | if (cp->af == af && |
237 | ip_vs_addr_equal(af, s_addr, &cp->caddr) && | |
238 | ip_vs_addr_equal(af, d_addr, &cp->vaddr) && | |
239 | s_port == cp->cport && d_port == cp->vport && | |
87375ab4 | 240 | ((!s_port) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) && |
e7ade46a | 241 | protocol == cp->protocol) { |
1da177e4 LT |
242 | /* HIT */ |
243 | atomic_inc(&cp->refcnt); | |
244 | ct_read_unlock(hash); | |
245 | return cp; | |
246 | } | |
247 | } | |
248 | ||
249 | ct_read_unlock(hash); | |
250 | ||
251 | return NULL; | |
252 | } | |
253 | ||
254 | struct ip_vs_conn *ip_vs_conn_in_get | |
28364a59 JV |
255 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
256 | const union nf_inet_addr *d_addr, __be16 d_port) | |
1da177e4 LT |
257 | { |
258 | struct ip_vs_conn *cp; | |
259 | ||
28364a59 | 260 | cp = __ip_vs_conn_in_get(af, protocol, s_addr, s_port, d_addr, d_port); |
1da177e4 | 261 | if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) |
28364a59 JV |
262 | cp = __ip_vs_conn_in_get(af, protocol, s_addr, 0, d_addr, |
263 | d_port); | |
1da177e4 | 264 | |
28364a59 JV |
265 | IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n", |
266 | ip_vs_proto_name(protocol), | |
267 | IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port), | |
268 | IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port), | |
269 | cp ? "hit" : "not hit"); | |
1da177e4 LT |
270 | |
271 | return cp; | |
272 | } | |
273 | ||
87375ab4 JA |
274 | /* Get reference to connection template */ |
275 | struct ip_vs_conn *ip_vs_ct_in_get | |
28364a59 JV |
276 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
277 | const union nf_inet_addr *d_addr, __be16 d_port) | |
87375ab4 JA |
278 | { |
279 | unsigned hash; | |
280 | struct ip_vs_conn *cp; | |
281 | ||
28364a59 | 282 | hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port); |
87375ab4 JA |
283 | |
284 | ct_read_lock(hash); | |
285 | ||
286 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
28364a59 JV |
287 | if (cp->af == af && |
288 | ip_vs_addr_equal(af, s_addr, &cp->caddr) && | |
be8be9ec SH |
289 | /* protocol should only be IPPROTO_IP if |
290 | * d_addr is a fwmark */ | |
291 | ip_vs_addr_equal(protocol == IPPROTO_IP ? AF_UNSPEC : af, | |
292 | d_addr, &cp->vaddr) && | |
28364a59 | 293 | s_port == cp->cport && d_port == cp->vport && |
87375ab4 | 294 | cp->flags & IP_VS_CONN_F_TEMPLATE && |
e7ade46a | 295 | protocol == cp->protocol) { |
87375ab4 JA |
296 | /* HIT */ |
297 | atomic_inc(&cp->refcnt); | |
298 | goto out; | |
299 | } | |
300 | } | |
301 | cp = NULL; | |
302 | ||
303 | out: | |
304 | ct_read_unlock(hash); | |
305 | ||
28364a59 JV |
306 | IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n", |
307 | ip_vs_proto_name(protocol), | |
308 | IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port), | |
309 | IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port), | |
310 | cp ? "hit" : "not hit"); | |
87375ab4 JA |
311 | |
312 | return cp; | |
313 | } | |
1da177e4 LT |
314 | |
315 | /* | |
316 | * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. | |
317 | * Called for pkts coming from inside-to-OUTside. | |
318 | * s_addr, s_port: pkt source address (inside host) | |
319 | * d_addr, d_port: pkt dest address (foreign host) | |
320 | */ | |
321 | struct ip_vs_conn *ip_vs_conn_out_get | |
28364a59 JV |
322 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
323 | const union nf_inet_addr *d_addr, __be16 d_port) | |
1da177e4 LT |
324 | { |
325 | unsigned hash; | |
326 | struct ip_vs_conn *cp, *ret=NULL; | |
327 | ||
328 | /* | |
329 | * Check for "full" addressed entries | |
330 | */ | |
28364a59 | 331 | hash = ip_vs_conn_hashkey(af, protocol, d_addr, d_port); |
1da177e4 LT |
332 | |
333 | ct_read_lock(hash); | |
334 | ||
335 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
28364a59 JV |
336 | if (cp->af == af && |
337 | ip_vs_addr_equal(af, d_addr, &cp->caddr) && | |
338 | ip_vs_addr_equal(af, s_addr, &cp->daddr) && | |
339 | d_port == cp->cport && s_port == cp->dport && | |
1da177e4 LT |
340 | protocol == cp->protocol) { |
341 | /* HIT */ | |
342 | atomic_inc(&cp->refcnt); | |
343 | ret = cp; | |
344 | break; | |
345 | } | |
346 | } | |
347 | ||
348 | ct_read_unlock(hash); | |
349 | ||
28364a59 JV |
350 | IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n", |
351 | ip_vs_proto_name(protocol), | |
352 | IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port), | |
353 | IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port), | |
354 | ret ? "hit" : "not hit"); | |
1da177e4 LT |
355 | |
356 | return ret; | |
357 | } | |
358 | ||
359 | ||
360 | /* | |
361 | * Put back the conn and restart its timer with its timeout | |
362 | */ | |
363 | void ip_vs_conn_put(struct ip_vs_conn *cp) | |
364 | { | |
26ec037f NC |
365 | unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ? |
366 | 0 : cp->timeout; | |
367 | mod_timer(&cp->timer, jiffies+t); | |
1da177e4 LT |
368 | |
369 | __ip_vs_conn_put(cp); | |
370 | } | |
371 | ||
372 | ||
373 | /* | |
374 | * Fill a no_client_port connection with a client port number | |
375 | */ | |
014d730d | 376 | void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) |
1da177e4 LT |
377 | { |
378 | if (ip_vs_conn_unhash(cp)) { | |
379 | spin_lock(&cp->lock); | |
380 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) { | |
381 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
382 | cp->flags &= ~IP_VS_CONN_F_NO_CPORT; | |
383 | cp->cport = cport; | |
384 | } | |
385 | spin_unlock(&cp->lock); | |
386 | ||
387 | /* hash on new dport */ | |
388 | ip_vs_conn_hash(cp); | |
389 | } | |
390 | } | |
391 | ||
392 | ||
393 | /* | |
394 | * Bind a connection entry with the corresponding packet_xmit. | |
395 | * Called by ip_vs_conn_new. | |
396 | */ | |
397 | static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) | |
398 | { | |
399 | switch (IP_VS_FWD_METHOD(cp)) { | |
400 | case IP_VS_CONN_F_MASQ: | |
401 | cp->packet_xmit = ip_vs_nat_xmit; | |
402 | break; | |
403 | ||
404 | case IP_VS_CONN_F_TUNNEL: | |
405 | cp->packet_xmit = ip_vs_tunnel_xmit; | |
406 | break; | |
407 | ||
408 | case IP_VS_CONN_F_DROUTE: | |
409 | cp->packet_xmit = ip_vs_dr_xmit; | |
410 | break; | |
411 | ||
412 | case IP_VS_CONN_F_LOCALNODE: | |
413 | cp->packet_xmit = ip_vs_null_xmit; | |
414 | break; | |
415 | ||
416 | case IP_VS_CONN_F_BYPASS: | |
417 | cp->packet_xmit = ip_vs_bypass_xmit; | |
418 | break; | |
419 | } | |
420 | } | |
421 | ||
b3cdd2a7 JV |
422 | #ifdef CONFIG_IP_VS_IPV6 |
423 | static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp) | |
424 | { | |
425 | switch (IP_VS_FWD_METHOD(cp)) { | |
426 | case IP_VS_CONN_F_MASQ: | |
427 | cp->packet_xmit = ip_vs_nat_xmit_v6; | |
428 | break; | |
429 | ||
430 | case IP_VS_CONN_F_TUNNEL: | |
431 | cp->packet_xmit = ip_vs_tunnel_xmit_v6; | |
432 | break; | |
433 | ||
434 | case IP_VS_CONN_F_DROUTE: | |
435 | cp->packet_xmit = ip_vs_dr_xmit_v6; | |
436 | break; | |
437 | ||
438 | case IP_VS_CONN_F_LOCALNODE: | |
439 | cp->packet_xmit = ip_vs_null_xmit; | |
440 | break; | |
441 | ||
442 | case IP_VS_CONN_F_BYPASS: | |
443 | cp->packet_xmit = ip_vs_bypass_xmit_v6; | |
444 | break; | |
445 | } | |
446 | } | |
447 | #endif | |
448 | ||
1da177e4 LT |
449 | |
450 | static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) | |
451 | { | |
452 | return atomic_read(&dest->activeconns) | |
453 | + atomic_read(&dest->inactconns); | |
454 | } | |
455 | ||
456 | /* | |
457 | * Bind a connection entry with a virtual service destination | |
458 | * Called just after a new connection entry is created. | |
459 | */ | |
460 | static inline void | |
461 | ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) | |
462 | { | |
463 | /* if dest is NULL, then return directly */ | |
464 | if (!dest) | |
465 | return; | |
466 | ||
467 | /* Increase the refcnt counter of the dest */ | |
468 | atomic_inc(&dest->refcnt); | |
469 | ||
470 | /* Bind with the destination and its corresponding transmitter */ | |
b209639e RB |
471 | if ((cp->flags & IP_VS_CONN_F_SYNC) && |
472 | (!(cp->flags & IP_VS_CONN_F_TEMPLATE))) | |
473 | /* if the connection is not template and is created | |
474 | * by sync, preserve the activity flag. | |
475 | */ | |
476 | cp->flags |= atomic_read(&dest->conn_flags) & | |
477 | (~IP_VS_CONN_F_INACTIVE); | |
478 | else | |
479 | cp->flags |= atomic_read(&dest->conn_flags); | |
1da177e4 LT |
480 | cp->dest = dest; |
481 | ||
cfc78c5a JV |
482 | IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d " |
483 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
484 | "dest->refcnt:%d\n", | |
485 | ip_vs_proto_name(cp->protocol), | |
486 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
487 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
488 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
489 | ip_vs_fwd_tag(cp), cp->state, | |
490 | cp->flags, atomic_read(&cp->refcnt), | |
491 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
492 | |
493 | /* Update the connection counters */ | |
87375ab4 | 494 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
495 | /* It is a normal connection, so increase the inactive |
496 | connection counter because it is in TCP SYNRECV | |
497 | state (inactive) or other protocol inacive state */ | |
b209639e RB |
498 | if ((cp->flags & IP_VS_CONN_F_SYNC) && |
499 | (!(cp->flags & IP_VS_CONN_F_INACTIVE))) | |
500 | atomic_inc(&dest->activeconns); | |
501 | else | |
502 | atomic_inc(&dest->inactconns); | |
1da177e4 LT |
503 | } else { |
504 | /* It is a persistent connection/template, so increase | |
505 | the peristent connection counter */ | |
506 | atomic_inc(&dest->persistconns); | |
507 | } | |
508 | ||
509 | if (dest->u_threshold != 0 && | |
510 | ip_vs_dest_totalconns(dest) >= dest->u_threshold) | |
511 | dest->flags |= IP_VS_DEST_F_OVERLOAD; | |
512 | } | |
513 | ||
514 | ||
1e356f9c RB |
515 | /* |
516 | * Check if there is a destination for the connection, if so | |
517 | * bind the connection to the destination. | |
518 | */ | |
519 | struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp) | |
520 | { | |
521 | struct ip_vs_dest *dest; | |
522 | ||
523 | if ((cp) && (!cp->dest)) { | |
7937df15 JV |
524 | dest = ip_vs_find_dest(cp->af, &cp->daddr, cp->dport, |
525 | &cp->vaddr, cp->vport, | |
526 | cp->protocol); | |
1e356f9c RB |
527 | ip_vs_bind_dest(cp, dest); |
528 | return dest; | |
529 | } else | |
530 | return NULL; | |
531 | } | |
1e356f9c RB |
532 | |
533 | ||
1da177e4 LT |
534 | /* |
535 | * Unbind a connection entry with its VS destination | |
536 | * Called by the ip_vs_conn_expire function. | |
537 | */ | |
538 | static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) | |
539 | { | |
540 | struct ip_vs_dest *dest = cp->dest; | |
541 | ||
542 | if (!dest) | |
543 | return; | |
544 | ||
cfc78c5a JV |
545 | IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d " |
546 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
547 | "dest->refcnt:%d\n", | |
548 | ip_vs_proto_name(cp->protocol), | |
549 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
550 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
551 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
552 | ip_vs_fwd_tag(cp), cp->state, | |
553 | cp->flags, atomic_read(&cp->refcnt), | |
554 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
555 | |
556 | /* Update the connection counters */ | |
87375ab4 | 557 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
558 | /* It is a normal connection, so decrease the inactconns |
559 | or activeconns counter */ | |
560 | if (cp->flags & IP_VS_CONN_F_INACTIVE) { | |
561 | atomic_dec(&dest->inactconns); | |
562 | } else { | |
563 | atomic_dec(&dest->activeconns); | |
564 | } | |
565 | } else { | |
566 | /* It is a persistent connection/template, so decrease | |
567 | the peristent connection counter */ | |
568 | atomic_dec(&dest->persistconns); | |
569 | } | |
570 | ||
571 | if (dest->l_threshold != 0) { | |
572 | if (ip_vs_dest_totalconns(dest) < dest->l_threshold) | |
573 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
574 | } else if (dest->u_threshold != 0) { | |
575 | if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) | |
576 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
577 | } else { | |
578 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
579 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Simply decrease the refcnt of the dest, because the | |
584 | * dest will be either in service's destination list | |
585 | * or in the trash. | |
586 | */ | |
587 | atomic_dec(&dest->refcnt); | |
588 | } | |
589 | ||
590 | ||
591 | /* | |
592 | * Checking if the destination of a connection template is available. | |
593 | * If available, return 1, otherwise invalidate this connection | |
594 | * template and return 0. | |
595 | */ | |
596 | int ip_vs_check_template(struct ip_vs_conn *ct) | |
597 | { | |
598 | struct ip_vs_dest *dest = ct->dest; | |
599 | ||
600 | /* | |
601 | * Checking the dest server status. | |
602 | */ | |
603 | if ((dest == NULL) || | |
e905a9ed YH |
604 | !(dest->flags & IP_VS_DEST_F_AVAILABLE) || |
605 | (sysctl_ip_vs_expire_quiescent_template && | |
1da177e4 | 606 | (atomic_read(&dest->weight) == 0))) { |
cfc78c5a JV |
607 | IP_VS_DBG_BUF(9, "check_template: dest not available for " |
608 | "protocol %s s:%s:%d v:%s:%d " | |
609 | "-> d:%s:%d\n", | |
610 | ip_vs_proto_name(ct->protocol), | |
611 | IP_VS_DBG_ADDR(ct->af, &ct->caddr), | |
612 | ntohs(ct->cport), | |
613 | IP_VS_DBG_ADDR(ct->af, &ct->vaddr), | |
614 | ntohs(ct->vport), | |
615 | IP_VS_DBG_ADDR(ct->af, &ct->daddr), | |
616 | ntohs(ct->dport)); | |
1da177e4 LT |
617 | |
618 | /* | |
619 | * Invalidate the connection template | |
620 | */ | |
014d730d | 621 | if (ct->vport != htons(0xffff)) { |
1da177e4 | 622 | if (ip_vs_conn_unhash(ct)) { |
014d730d AV |
623 | ct->dport = htons(0xffff); |
624 | ct->vport = htons(0xffff); | |
1da177e4 LT |
625 | ct->cport = 0; |
626 | ip_vs_conn_hash(ct); | |
627 | } | |
628 | } | |
629 | ||
630 | /* | |
631 | * Simply decrease the refcnt of the template, | |
632 | * don't restart its timer. | |
633 | */ | |
634 | atomic_dec(&ct->refcnt); | |
635 | return 0; | |
636 | } | |
637 | return 1; | |
638 | } | |
639 | ||
640 | static void ip_vs_conn_expire(unsigned long data) | |
641 | { | |
642 | struct ip_vs_conn *cp = (struct ip_vs_conn *)data; | |
643 | ||
644 | cp->timeout = 60*HZ; | |
645 | ||
646 | /* | |
647 | * hey, I'm using it | |
648 | */ | |
649 | atomic_inc(&cp->refcnt); | |
650 | ||
651 | /* | |
652 | * do I control anybody? | |
653 | */ | |
654 | if (atomic_read(&cp->n_control)) | |
655 | goto expire_later; | |
656 | ||
657 | /* | |
658 | * unhash it if it is hashed in the conn table | |
659 | */ | |
26ec037f | 660 | if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET)) |
1da177e4 LT |
661 | goto expire_later; |
662 | ||
663 | /* | |
664 | * refcnt==1 implies I'm the only one referrer | |
665 | */ | |
666 | if (likely(atomic_read(&cp->refcnt) == 1)) { | |
667 | /* delete the timer if it is activated by other users */ | |
668 | if (timer_pending(&cp->timer)) | |
669 | del_timer(&cp->timer); | |
670 | ||
671 | /* does anybody control me? */ | |
672 | if (cp->control) | |
673 | ip_vs_control_del(cp); | |
674 | ||
675 | if (unlikely(cp->app != NULL)) | |
676 | ip_vs_unbind_app(cp); | |
677 | ip_vs_unbind_dest(cp); | |
678 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) | |
679 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
680 | atomic_dec(&ip_vs_conn_count); | |
681 | ||
682 | kmem_cache_free(ip_vs_conn_cachep, cp); | |
683 | return; | |
684 | } | |
685 | ||
686 | /* hash it back to the table */ | |
687 | ip_vs_conn_hash(cp); | |
688 | ||
689 | expire_later: | |
4b5bdf5c | 690 | IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n", |
1da177e4 LT |
691 | atomic_read(&cp->refcnt)-1, |
692 | atomic_read(&cp->n_control)); | |
693 | ||
694 | ip_vs_conn_put(cp); | |
695 | } | |
696 | ||
697 | ||
698 | void ip_vs_conn_expire_now(struct ip_vs_conn *cp) | |
699 | { | |
700 | if (del_timer(&cp->timer)) | |
701 | mod_timer(&cp->timer, jiffies); | |
1da177e4 LT |
702 | } |
703 | ||
704 | ||
705 | /* | |
706 | * Create a new connection entry and hash it into the ip_vs_conn_tab | |
707 | */ | |
708 | struct ip_vs_conn * | |
28364a59 JV |
709 | ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport, |
710 | const union nf_inet_addr *vaddr, __be16 vport, | |
711 | const union nf_inet_addr *daddr, __be16 dport, unsigned flags, | |
1da177e4 LT |
712 | struct ip_vs_dest *dest) |
713 | { | |
714 | struct ip_vs_conn *cp; | |
715 | struct ip_vs_protocol *pp = ip_vs_proto_get(proto); | |
716 | ||
c3762229 | 717 | cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC); |
1da177e4 | 718 | if (cp == NULL) { |
1e3e238e | 719 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
720 | return NULL; |
721 | } | |
722 | ||
1da177e4 | 723 | INIT_LIST_HEAD(&cp->c_list); |
b24b8a24 | 724 | setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp); |
28364a59 | 725 | cp->af = af; |
1da177e4 | 726 | cp->protocol = proto; |
28364a59 | 727 | ip_vs_addr_copy(af, &cp->caddr, caddr); |
1da177e4 | 728 | cp->cport = cport; |
28364a59 | 729 | ip_vs_addr_copy(af, &cp->vaddr, vaddr); |
1da177e4 | 730 | cp->vport = vport; |
be8be9ec SH |
731 | /* proto should only be IPPROTO_IP if d_addr is a fwmark */ |
732 | ip_vs_addr_copy(proto == IPPROTO_IP ? AF_UNSPEC : af, | |
733 | &cp->daddr, daddr); | |
1da177e4 LT |
734 | cp->dport = dport; |
735 | cp->flags = flags; | |
736 | spin_lock_init(&cp->lock); | |
737 | ||
738 | /* | |
739 | * Set the entry is referenced by the current thread before hashing | |
740 | * it in the table, so that other thread run ip_vs_random_dropentry | |
741 | * but cannot drop this entry. | |
742 | */ | |
743 | atomic_set(&cp->refcnt, 1); | |
744 | ||
745 | atomic_set(&cp->n_control, 0); | |
746 | atomic_set(&cp->in_pkts, 0); | |
747 | ||
748 | atomic_inc(&ip_vs_conn_count); | |
749 | if (flags & IP_VS_CONN_F_NO_CPORT) | |
750 | atomic_inc(&ip_vs_conn_no_cport_cnt); | |
751 | ||
752 | /* Bind the connection with a destination server */ | |
753 | ip_vs_bind_dest(cp, dest); | |
754 | ||
755 | /* Set its state and timeout */ | |
756 | cp->state = 0; | |
757 | cp->timeout = 3*HZ; | |
758 | ||
759 | /* Bind its packet transmitter */ | |
b3cdd2a7 JV |
760 | #ifdef CONFIG_IP_VS_IPV6 |
761 | if (af == AF_INET6) | |
762 | ip_vs_bind_xmit_v6(cp); | |
763 | else | |
764 | #endif | |
765 | ip_vs_bind_xmit(cp); | |
1da177e4 LT |
766 | |
767 | if (unlikely(pp && atomic_read(&pp->appcnt))) | |
768 | ip_vs_bind_app(cp, pp); | |
769 | ||
770 | /* Hash it in the ip_vs_conn_tab finally */ | |
771 | ip_vs_conn_hash(cp); | |
772 | ||
773 | return cp; | |
774 | } | |
775 | ||
776 | ||
777 | /* | |
778 | * /proc/net/ip_vs_conn entries | |
779 | */ | |
780 | #ifdef CONFIG_PROC_FS | |
781 | ||
782 | static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) | |
783 | { | |
784 | int idx; | |
785 | struct ip_vs_conn *cp; | |
e905a9ed | 786 | |
6f7edb48 | 787 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 LT |
788 | ct_read_lock_bh(idx); |
789 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
790 | if (pos-- == 0) { | |
791 | seq->private = &ip_vs_conn_tab[idx]; | |
792 | return cp; | |
793 | } | |
794 | } | |
795 | ct_read_unlock_bh(idx); | |
796 | } | |
797 | ||
798 | return NULL; | |
799 | } | |
800 | ||
801 | static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) | |
802 | { | |
803 | seq->private = NULL; | |
804 | return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; | |
805 | } | |
806 | ||
807 | static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
808 | { | |
809 | struct ip_vs_conn *cp = v; | |
810 | struct list_head *e, *l = seq->private; | |
811 | int idx; | |
812 | ||
813 | ++*pos; | |
e905a9ed | 814 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
815 | return ip_vs_conn_array(seq, 0); |
816 | ||
817 | /* more on same hash chain? */ | |
818 | if ((e = cp->c_list.next) != l) | |
819 | return list_entry(e, struct ip_vs_conn, c_list); | |
820 | ||
821 | idx = l - ip_vs_conn_tab; | |
822 | ct_read_unlock_bh(idx); | |
823 | ||
6f7edb48 | 824 | while (++idx < ip_vs_conn_tab_size) { |
1da177e4 LT |
825 | ct_read_lock_bh(idx); |
826 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
827 | seq->private = &ip_vs_conn_tab[idx]; | |
828 | return cp; | |
e905a9ed | 829 | } |
1da177e4 LT |
830 | ct_read_unlock_bh(idx); |
831 | } | |
832 | seq->private = NULL; | |
833 | return NULL; | |
834 | } | |
835 | ||
836 | static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) | |
837 | { | |
838 | struct list_head *l = seq->private; | |
839 | ||
840 | if (l) | |
841 | ct_read_unlock_bh(l - ip_vs_conn_tab); | |
842 | } | |
843 | ||
844 | static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) | |
845 | { | |
846 | ||
847 | if (v == SEQ_START_TOKEN) | |
848 | seq_puts(seq, | |
849 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires\n"); | |
850 | else { | |
851 | const struct ip_vs_conn *cp = v; | |
852 | ||
667a5f18 VB |
853 | #ifdef CONFIG_IP_VS_IPV6 |
854 | if (cp->af == AF_INET6) | |
5b095d98 | 855 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %7lu\n", |
667a5f18 | 856 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
857 | &cp->caddr.in6, ntohs(cp->cport), |
858 | &cp->vaddr.in6, ntohs(cp->vport), | |
859 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 VB |
860 | ip_vs_state_name(cp->protocol, cp->state), |
861 | (cp->timer.expires-jiffies)/HZ); | |
862 | else | |
863 | #endif | |
864 | seq_printf(seq, | |
865 | "%-3s %08X %04X %08X %04X" | |
866 | " %08X %04X %-11s %7lu\n", | |
1da177e4 | 867 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
868 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
869 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
870 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
1da177e4 LT |
871 | ip_vs_state_name(cp->protocol, cp->state), |
872 | (cp->timer.expires-jiffies)/HZ); | |
873 | } | |
874 | return 0; | |
875 | } | |
876 | ||
56b3d975 | 877 | static const struct seq_operations ip_vs_conn_seq_ops = { |
1da177e4 LT |
878 | .start = ip_vs_conn_seq_start, |
879 | .next = ip_vs_conn_seq_next, | |
880 | .stop = ip_vs_conn_seq_stop, | |
881 | .show = ip_vs_conn_seq_show, | |
882 | }; | |
883 | ||
884 | static int ip_vs_conn_open(struct inode *inode, struct file *file) | |
885 | { | |
886 | return seq_open(file, &ip_vs_conn_seq_ops); | |
887 | } | |
888 | ||
9a32144e | 889 | static const struct file_operations ip_vs_conn_fops = { |
1da177e4 LT |
890 | .owner = THIS_MODULE, |
891 | .open = ip_vs_conn_open, | |
892 | .read = seq_read, | |
893 | .llseek = seq_lseek, | |
894 | .release = seq_release, | |
895 | }; | |
7a4fbb1f RB |
896 | |
897 | static const char *ip_vs_origin_name(unsigned flags) | |
898 | { | |
899 | if (flags & IP_VS_CONN_F_SYNC) | |
900 | return "SYNC"; | |
901 | else | |
902 | return "LOCAL"; | |
903 | } | |
904 | ||
905 | static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) | |
906 | { | |
907 | ||
908 | if (v == SEQ_START_TOKEN) | |
909 | seq_puts(seq, | |
910 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); | |
911 | else { | |
912 | const struct ip_vs_conn *cp = v; | |
913 | ||
667a5f18 VB |
914 | #ifdef CONFIG_IP_VS_IPV6 |
915 | if (cp->af == AF_INET6) | |
5b095d98 | 916 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n", |
667a5f18 | 917 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
918 | &cp->caddr.in6, ntohs(cp->cport), |
919 | &cp->vaddr.in6, ntohs(cp->vport), | |
920 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 VB |
921 | ip_vs_state_name(cp->protocol, cp->state), |
922 | ip_vs_origin_name(cp->flags), | |
923 | (cp->timer.expires-jiffies)/HZ); | |
924 | else | |
925 | #endif | |
926 | seq_printf(seq, | |
927 | "%-3s %08X %04X %08X %04X " | |
928 | "%08X %04X %-11s %-6s %7lu\n", | |
7a4fbb1f | 929 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
930 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
931 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
932 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
7a4fbb1f RB |
933 | ip_vs_state_name(cp->protocol, cp->state), |
934 | ip_vs_origin_name(cp->flags), | |
935 | (cp->timer.expires-jiffies)/HZ); | |
936 | } | |
937 | return 0; | |
938 | } | |
939 | ||
940 | static const struct seq_operations ip_vs_conn_sync_seq_ops = { | |
941 | .start = ip_vs_conn_seq_start, | |
942 | .next = ip_vs_conn_seq_next, | |
943 | .stop = ip_vs_conn_seq_stop, | |
944 | .show = ip_vs_conn_sync_seq_show, | |
945 | }; | |
946 | ||
947 | static int ip_vs_conn_sync_open(struct inode *inode, struct file *file) | |
948 | { | |
949 | return seq_open(file, &ip_vs_conn_sync_seq_ops); | |
950 | } | |
951 | ||
952 | static const struct file_operations ip_vs_conn_sync_fops = { | |
953 | .owner = THIS_MODULE, | |
954 | .open = ip_vs_conn_sync_open, | |
955 | .read = seq_read, | |
956 | .llseek = seq_lseek, | |
957 | .release = seq_release, | |
958 | }; | |
959 | ||
1da177e4 LT |
960 | #endif |
961 | ||
962 | ||
963 | /* | |
964 | * Randomly drop connection entries before running out of memory | |
965 | */ | |
966 | static inline int todrop_entry(struct ip_vs_conn *cp) | |
967 | { | |
968 | /* | |
969 | * The drop rate array needs tuning for real environments. | |
970 | * Called from timer bh only => no locking | |
971 | */ | |
9b5b5cff | 972 | static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; |
1da177e4 LT |
973 | static char todrop_counter[9] = {0}; |
974 | int i; | |
975 | ||
976 | /* if the conn entry hasn't lasted for 60 seconds, don't drop it. | |
977 | This will leave enough time for normal connection to get | |
978 | through. */ | |
979 | if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) | |
980 | return 0; | |
981 | ||
982 | /* Don't drop the entry if its number of incoming packets is not | |
983 | located in [0, 8] */ | |
984 | i = atomic_read(&cp->in_pkts); | |
985 | if (i > 8 || i < 0) return 0; | |
986 | ||
987 | if (!todrop_rate[i]) return 0; | |
988 | if (--todrop_counter[i] > 0) return 0; | |
989 | ||
990 | todrop_counter[i] = todrop_rate[i]; | |
991 | return 1; | |
992 | } | |
993 | ||
af9debd4 | 994 | /* Called from keventd and must protect itself from softirqs */ |
1da177e4 LT |
995 | void ip_vs_random_dropentry(void) |
996 | { | |
997 | int idx; | |
998 | struct ip_vs_conn *cp; | |
1da177e4 LT |
999 | |
1000 | /* | |
1001 | * Randomly scan 1/32 of the whole table every second | |
1002 | */ | |
6f7edb48 CB |
1003 | for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) { |
1004 | unsigned hash = net_random() & ip_vs_conn_tab_mask; | |
1da177e4 LT |
1005 | |
1006 | /* | |
1007 | * Lock is actually needed in this loop. | |
1008 | */ | |
af9debd4 | 1009 | ct_write_lock_bh(hash); |
1da177e4 LT |
1010 | |
1011 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
87375ab4 | 1012 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) |
1da177e4 LT |
1013 | /* connection template */ |
1014 | continue; | |
1015 | ||
1016 | if (cp->protocol == IPPROTO_TCP) { | |
1017 | switch(cp->state) { | |
1018 | case IP_VS_TCP_S_SYN_RECV: | |
1019 | case IP_VS_TCP_S_SYNACK: | |
1020 | break; | |
1021 | ||
1022 | case IP_VS_TCP_S_ESTABLISHED: | |
1023 | if (todrop_entry(cp)) | |
1024 | break; | |
1025 | continue; | |
1026 | ||
1027 | default: | |
1028 | continue; | |
1029 | } | |
1030 | } else { | |
1031 | if (!todrop_entry(cp)) | |
1032 | continue; | |
1033 | } | |
1034 | ||
1da177e4 LT |
1035 | IP_VS_DBG(4, "del connection\n"); |
1036 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1037 | if (cp->control) { |
1da177e4 | 1038 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1039 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1040 | } |
1da177e4 | 1041 | } |
af9debd4 | 1042 | ct_write_unlock_bh(hash); |
1da177e4 LT |
1043 | } |
1044 | } | |
1045 | ||
1046 | ||
1047 | /* | |
1048 | * Flush all the connection entries in the ip_vs_conn_tab | |
1049 | */ | |
1050 | static void ip_vs_conn_flush(void) | |
1051 | { | |
1052 | int idx; | |
1053 | struct ip_vs_conn *cp; | |
1da177e4 LT |
1054 | |
1055 | flush_again: | |
6f7edb48 | 1056 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 LT |
1057 | /* |
1058 | * Lock is actually needed in this loop. | |
1059 | */ | |
1060 | ct_write_lock_bh(idx); | |
1061 | ||
1062 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
1da177e4 | 1063 | |
1da177e4 LT |
1064 | IP_VS_DBG(4, "del connection\n"); |
1065 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1066 | if (cp->control) { |
1da177e4 | 1067 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1068 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1069 | } |
1da177e4 LT |
1070 | } |
1071 | ct_write_unlock_bh(idx); | |
1072 | } | |
1073 | ||
1074 | /* the counter may be not NULL, because maybe some conn entries | |
1075 | are run by slow timer handler or unhashed but still referred */ | |
1076 | if (atomic_read(&ip_vs_conn_count) != 0) { | |
1077 | schedule(); | |
1078 | goto flush_again; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | ||
048cf48b | 1083 | int __init ip_vs_conn_init(void) |
1da177e4 LT |
1084 | { |
1085 | int idx; | |
1086 | ||
6f7edb48 CB |
1087 | /* Compute size and mask */ |
1088 | ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits; | |
1089 | ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1; | |
1090 | ||
1da177e4 LT |
1091 | /* |
1092 | * Allocate the connection hash table and initialize its list heads | |
1093 | */ | |
6f7edb48 CB |
1094 | ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * |
1095 | sizeof(struct list_head)); | |
1da177e4 LT |
1096 | if (!ip_vs_conn_tab) |
1097 | return -ENOMEM; | |
1098 | ||
1099 | /* Allocate ip_vs_conn slab cache */ | |
1100 | ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", | |
1101 | sizeof(struct ip_vs_conn), 0, | |
20c2df83 | 1102 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1103 | if (!ip_vs_conn_cachep) { |
1104 | vfree(ip_vs_conn_tab); | |
1105 | return -ENOMEM; | |
1106 | } | |
1107 | ||
1e3e238e HE |
1108 | pr_info("Connection hash table configured " |
1109 | "(size=%d, memory=%ldKbytes)\n", | |
6f7edb48 CB |
1110 | ip_vs_conn_tab_size, |
1111 | (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024); | |
1da177e4 LT |
1112 | IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n", |
1113 | sizeof(struct ip_vs_conn)); | |
1114 | ||
6f7edb48 | 1115 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 LT |
1116 | INIT_LIST_HEAD(&ip_vs_conn_tab[idx]); |
1117 | } | |
1118 | ||
1119 | for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { | |
1120 | rwlock_init(&__ip_vs_conntbl_lock_array[idx].l); | |
1121 | } | |
1122 | ||
457c4cbc | 1123 | proc_net_fops_create(&init_net, "ip_vs_conn", 0, &ip_vs_conn_fops); |
7a4fbb1f | 1124 | proc_net_fops_create(&init_net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops); |
1da177e4 LT |
1125 | |
1126 | /* calculate the random value for connection hash */ | |
1127 | get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); | |
1128 | ||
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | ||
1133 | void ip_vs_conn_cleanup(void) | |
1134 | { | |
1135 | /* flush all the connection entries first */ | |
1136 | ip_vs_conn_flush(); | |
1137 | ||
1138 | /* Release the empty cache */ | |
1139 | kmem_cache_destroy(ip_vs_conn_cachep); | |
457c4cbc | 1140 | proc_net_remove(&init_net, "ip_vs_conn"); |
7a4fbb1f | 1141 | proc_net_remove(&init_net, "ip_vs_conn_sync"); |
1da177e4 LT |
1142 | vfree(ip_vs_conn_tab); |
1143 | } |