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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 | ||
e924283b | 25 | #include <linux/interrupt.h> |
14c85021 | 26 | #include <linux/in.h> |
f190055f | 27 | #include <linux/net.h> |
1da177e4 | 28 | #include <linux/kernel.h> |
14c85021 | 29 | #include <linux/module.h> |
1da177e4 LT |
30 | #include <linux/vmalloc.h> |
31 | #include <linux/proc_fs.h> /* for proc_net_* */ | |
32 | #include <linux/seq_file.h> | |
33 | #include <linux/jhash.h> | |
34 | #include <linux/random.h> | |
35 | ||
457c4cbc | 36 | #include <net/net_namespace.h> |
1da177e4 LT |
37 | #include <net/ip_vs.h> |
38 | ||
39 | ||
40 | /* | |
41 | * Connection hash table: for input and output packets lookups of IPVS | |
42 | */ | |
43 | static struct list_head *ip_vs_conn_tab; | |
44 | ||
45 | /* SLAB cache for IPVS connections */ | |
e18b890b | 46 | static struct kmem_cache *ip_vs_conn_cachep __read_mostly; |
1da177e4 LT |
47 | |
48 | /* counter for current IPVS connections */ | |
49 | static atomic_t ip_vs_conn_count = ATOMIC_INIT(0); | |
50 | ||
51 | /* counter for no client port connections */ | |
52 | static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0); | |
53 | ||
54 | /* random value for IPVS connection hash */ | |
55 | static unsigned int ip_vs_conn_rnd; | |
56 | ||
57 | /* | |
58 | * Fine locking granularity for big connection hash table | |
59 | */ | |
60 | #define CT_LOCKARRAY_BITS 4 | |
61 | #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS) | |
62 | #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1) | |
63 | ||
64 | struct ip_vs_aligned_lock | |
65 | { | |
66 | rwlock_t l; | |
67 | } __attribute__((__aligned__(SMP_CACHE_BYTES))); | |
68 | ||
69 | /* lock array for conn table */ | |
70 | static struct ip_vs_aligned_lock | |
71 | __ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned; | |
72 | ||
73 | static inline void ct_read_lock(unsigned key) | |
74 | { | |
75 | read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
76 | } | |
77 | ||
78 | static inline void ct_read_unlock(unsigned key) | |
79 | { | |
80 | read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
81 | } | |
82 | ||
83 | static inline void ct_write_lock(unsigned key) | |
84 | { | |
85 | write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
86 | } | |
87 | ||
88 | static inline void ct_write_unlock(unsigned key) | |
89 | { | |
90 | write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
91 | } | |
92 | ||
93 | static inline void ct_read_lock_bh(unsigned key) | |
94 | { | |
95 | read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
96 | } | |
97 | ||
98 | static inline void ct_read_unlock_bh(unsigned key) | |
99 | { | |
100 | read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
101 | } | |
102 | ||
103 | static inline void ct_write_lock_bh(unsigned key) | |
104 | { | |
105 | write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
106 | } | |
107 | ||
108 | static inline void ct_write_unlock_bh(unsigned key) | |
109 | { | |
110 | write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
111 | } | |
112 | ||
113 | ||
114 | /* | |
115 | * Returns hash value for IPVS connection entry | |
116 | */ | |
28364a59 JV |
117 | static unsigned int ip_vs_conn_hashkey(int af, unsigned proto, |
118 | const union nf_inet_addr *addr, | |
119 | __be16 port) | |
1da177e4 | 120 | { |
28364a59 JV |
121 | #ifdef CONFIG_IP_VS_IPV6 |
122 | if (af == AF_INET6) | |
123 | return jhash_3words(jhash(addr, 16, ip_vs_conn_rnd), | |
124 | (__force u32)port, proto, ip_vs_conn_rnd) | |
125 | & IP_VS_CONN_TAB_MASK; | |
126 | #endif | |
127 | return jhash_3words((__force u32)addr->ip, (__force u32)port, proto, | |
128 | ip_vs_conn_rnd) | |
1da177e4 LT |
129 | & IP_VS_CONN_TAB_MASK; |
130 | } | |
131 | ||
132 | ||
133 | /* | |
134 | * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port. | |
135 | * returns bool success. | |
136 | */ | |
137 | static inline int ip_vs_conn_hash(struct ip_vs_conn *cp) | |
138 | { | |
139 | unsigned hash; | |
140 | int ret; | |
141 | ||
142 | /* Hash by protocol, client address and port */ | |
28364a59 | 143 | hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport); |
1da177e4 LT |
144 | |
145 | ct_write_lock(hash); | |
146 | ||
147 | if (!(cp->flags & IP_VS_CONN_F_HASHED)) { | |
148 | list_add(&cp->c_list, &ip_vs_conn_tab[hash]); | |
149 | cp->flags |= IP_VS_CONN_F_HASHED; | |
150 | atomic_inc(&cp->refcnt); | |
151 | ret = 1; | |
152 | } else { | |
153 | IP_VS_ERR("ip_vs_conn_hash(): request for already hashed, " | |
154 | "called from %p\n", __builtin_return_address(0)); | |
155 | ret = 0; | |
156 | } | |
157 | ||
158 | ct_write_unlock(hash); | |
159 | ||
160 | return ret; | |
161 | } | |
162 | ||
163 | ||
164 | /* | |
165 | * UNhashes ip_vs_conn from ip_vs_conn_tab. | |
166 | * returns bool success. | |
167 | */ | |
168 | static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp) | |
169 | { | |
170 | unsigned hash; | |
171 | int ret; | |
172 | ||
173 | /* unhash it and decrease its reference counter */ | |
28364a59 | 174 | hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport); |
1da177e4 LT |
175 | |
176 | ct_write_lock(hash); | |
177 | ||
178 | if (cp->flags & IP_VS_CONN_F_HASHED) { | |
179 | list_del(&cp->c_list); | |
180 | cp->flags &= ~IP_VS_CONN_F_HASHED; | |
181 | atomic_dec(&cp->refcnt); | |
182 | ret = 1; | |
183 | } else | |
184 | ret = 0; | |
185 | ||
186 | ct_write_unlock(hash); | |
187 | ||
188 | return ret; | |
189 | } | |
190 | ||
191 | ||
192 | /* | |
193 | * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. | |
194 | * Called for pkts coming from OUTside-to-INside. | |
195 | * s_addr, s_port: pkt source address (foreign host) | |
196 | * d_addr, d_port: pkt dest address (load balancer) | |
197 | */ | |
198 | static inline struct ip_vs_conn *__ip_vs_conn_in_get | |
28364a59 JV |
199 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
200 | const union nf_inet_addr *d_addr, __be16 d_port) | |
1da177e4 LT |
201 | { |
202 | unsigned hash; | |
203 | struct ip_vs_conn *cp; | |
204 | ||
28364a59 | 205 | hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port); |
1da177e4 LT |
206 | |
207 | ct_read_lock(hash); | |
208 | ||
209 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
28364a59 JV |
210 | if (cp->af == af && |
211 | ip_vs_addr_equal(af, s_addr, &cp->caddr) && | |
212 | ip_vs_addr_equal(af, d_addr, &cp->vaddr) && | |
213 | s_port == cp->cport && d_port == cp->vport && | |
87375ab4 | 214 | ((!s_port) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) && |
e7ade46a | 215 | protocol == cp->protocol) { |
1da177e4 LT |
216 | /* HIT */ |
217 | atomic_inc(&cp->refcnt); | |
218 | ct_read_unlock(hash); | |
219 | return cp; | |
220 | } | |
221 | } | |
222 | ||
223 | ct_read_unlock(hash); | |
224 | ||
225 | return NULL; | |
226 | } | |
227 | ||
228 | struct ip_vs_conn *ip_vs_conn_in_get | |
28364a59 JV |
229 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
230 | const union nf_inet_addr *d_addr, __be16 d_port) | |
1da177e4 LT |
231 | { |
232 | struct ip_vs_conn *cp; | |
233 | ||
28364a59 | 234 | cp = __ip_vs_conn_in_get(af, protocol, s_addr, s_port, d_addr, d_port); |
1da177e4 | 235 | if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) |
28364a59 JV |
236 | cp = __ip_vs_conn_in_get(af, protocol, s_addr, 0, d_addr, |
237 | d_port); | |
1da177e4 | 238 | |
28364a59 JV |
239 | IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n", |
240 | ip_vs_proto_name(protocol), | |
241 | IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port), | |
242 | IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port), | |
243 | cp ? "hit" : "not hit"); | |
1da177e4 LT |
244 | |
245 | return cp; | |
246 | } | |
247 | ||
87375ab4 JA |
248 | /* Get reference to connection template */ |
249 | struct ip_vs_conn *ip_vs_ct_in_get | |
28364a59 JV |
250 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
251 | const union nf_inet_addr *d_addr, __be16 d_port) | |
87375ab4 JA |
252 | { |
253 | unsigned hash; | |
254 | struct ip_vs_conn *cp; | |
255 | ||
28364a59 | 256 | hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port); |
87375ab4 JA |
257 | |
258 | ct_read_lock(hash); | |
259 | ||
260 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
28364a59 JV |
261 | if (cp->af == af && |
262 | ip_vs_addr_equal(af, s_addr, &cp->caddr) && | |
263 | ip_vs_addr_equal(af, d_addr, &cp->vaddr) && | |
264 | s_port == cp->cport && d_port == cp->vport && | |
87375ab4 | 265 | cp->flags & IP_VS_CONN_F_TEMPLATE && |
e7ade46a | 266 | protocol == cp->protocol) { |
87375ab4 JA |
267 | /* HIT */ |
268 | atomic_inc(&cp->refcnt); | |
269 | goto out; | |
270 | } | |
271 | } | |
272 | cp = NULL; | |
273 | ||
274 | out: | |
275 | ct_read_unlock(hash); | |
276 | ||
28364a59 JV |
277 | IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n", |
278 | ip_vs_proto_name(protocol), | |
279 | IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port), | |
280 | IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port), | |
281 | cp ? "hit" : "not hit"); | |
87375ab4 JA |
282 | |
283 | return cp; | |
284 | } | |
1da177e4 LT |
285 | |
286 | /* | |
287 | * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. | |
288 | * Called for pkts coming from inside-to-OUTside. | |
289 | * s_addr, s_port: pkt source address (inside host) | |
290 | * d_addr, d_port: pkt dest address (foreign host) | |
291 | */ | |
292 | struct ip_vs_conn *ip_vs_conn_out_get | |
28364a59 JV |
293 | (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port, |
294 | const union nf_inet_addr *d_addr, __be16 d_port) | |
1da177e4 LT |
295 | { |
296 | unsigned hash; | |
297 | struct ip_vs_conn *cp, *ret=NULL; | |
298 | ||
299 | /* | |
300 | * Check for "full" addressed entries | |
301 | */ | |
28364a59 | 302 | hash = ip_vs_conn_hashkey(af, protocol, d_addr, d_port); |
1da177e4 LT |
303 | |
304 | ct_read_lock(hash); | |
305 | ||
306 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
28364a59 JV |
307 | if (cp->af == af && |
308 | ip_vs_addr_equal(af, d_addr, &cp->caddr) && | |
309 | ip_vs_addr_equal(af, s_addr, &cp->daddr) && | |
310 | d_port == cp->cport && s_port == cp->dport && | |
1da177e4 LT |
311 | protocol == cp->protocol) { |
312 | /* HIT */ | |
313 | atomic_inc(&cp->refcnt); | |
314 | ret = cp; | |
315 | break; | |
316 | } | |
317 | } | |
318 | ||
319 | ct_read_unlock(hash); | |
320 | ||
28364a59 JV |
321 | IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n", |
322 | ip_vs_proto_name(protocol), | |
323 | IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port), | |
324 | IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port), | |
325 | ret ? "hit" : "not hit"); | |
1da177e4 LT |
326 | |
327 | return ret; | |
328 | } | |
329 | ||
330 | ||
331 | /* | |
332 | * Put back the conn and restart its timer with its timeout | |
333 | */ | |
334 | void ip_vs_conn_put(struct ip_vs_conn *cp) | |
335 | { | |
336 | /* reset it expire in its timeout */ | |
337 | mod_timer(&cp->timer, jiffies+cp->timeout); | |
338 | ||
339 | __ip_vs_conn_put(cp); | |
340 | } | |
341 | ||
342 | ||
343 | /* | |
344 | * Fill a no_client_port connection with a client port number | |
345 | */ | |
014d730d | 346 | void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) |
1da177e4 LT |
347 | { |
348 | if (ip_vs_conn_unhash(cp)) { | |
349 | spin_lock(&cp->lock); | |
350 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) { | |
351 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
352 | cp->flags &= ~IP_VS_CONN_F_NO_CPORT; | |
353 | cp->cport = cport; | |
354 | } | |
355 | spin_unlock(&cp->lock); | |
356 | ||
357 | /* hash on new dport */ | |
358 | ip_vs_conn_hash(cp); | |
359 | } | |
360 | } | |
361 | ||
362 | ||
363 | /* | |
364 | * Bind a connection entry with the corresponding packet_xmit. | |
365 | * Called by ip_vs_conn_new. | |
366 | */ | |
367 | static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) | |
368 | { | |
369 | switch (IP_VS_FWD_METHOD(cp)) { | |
370 | case IP_VS_CONN_F_MASQ: | |
371 | cp->packet_xmit = ip_vs_nat_xmit; | |
372 | break; | |
373 | ||
374 | case IP_VS_CONN_F_TUNNEL: | |
375 | cp->packet_xmit = ip_vs_tunnel_xmit; | |
376 | break; | |
377 | ||
378 | case IP_VS_CONN_F_DROUTE: | |
379 | cp->packet_xmit = ip_vs_dr_xmit; | |
380 | break; | |
381 | ||
382 | case IP_VS_CONN_F_LOCALNODE: | |
383 | cp->packet_xmit = ip_vs_null_xmit; | |
384 | break; | |
385 | ||
386 | case IP_VS_CONN_F_BYPASS: | |
387 | cp->packet_xmit = ip_vs_bypass_xmit; | |
388 | break; | |
389 | } | |
390 | } | |
391 | ||
b3cdd2a7 JV |
392 | #ifdef CONFIG_IP_VS_IPV6 |
393 | static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp) | |
394 | { | |
395 | switch (IP_VS_FWD_METHOD(cp)) { | |
396 | case IP_VS_CONN_F_MASQ: | |
397 | cp->packet_xmit = ip_vs_nat_xmit_v6; | |
398 | break; | |
399 | ||
400 | case IP_VS_CONN_F_TUNNEL: | |
401 | cp->packet_xmit = ip_vs_tunnel_xmit_v6; | |
402 | break; | |
403 | ||
404 | case IP_VS_CONN_F_DROUTE: | |
405 | cp->packet_xmit = ip_vs_dr_xmit_v6; | |
406 | break; | |
407 | ||
408 | case IP_VS_CONN_F_LOCALNODE: | |
409 | cp->packet_xmit = ip_vs_null_xmit; | |
410 | break; | |
411 | ||
412 | case IP_VS_CONN_F_BYPASS: | |
413 | cp->packet_xmit = ip_vs_bypass_xmit_v6; | |
414 | break; | |
415 | } | |
416 | } | |
417 | #endif | |
418 | ||
1da177e4 LT |
419 | |
420 | static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) | |
421 | { | |
422 | return atomic_read(&dest->activeconns) | |
423 | + atomic_read(&dest->inactconns); | |
424 | } | |
425 | ||
426 | /* | |
427 | * Bind a connection entry with a virtual service destination | |
428 | * Called just after a new connection entry is created. | |
429 | */ | |
430 | static inline void | |
431 | ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) | |
432 | { | |
433 | /* if dest is NULL, then return directly */ | |
434 | if (!dest) | |
435 | return; | |
436 | ||
437 | /* Increase the refcnt counter of the dest */ | |
438 | atomic_inc(&dest->refcnt); | |
439 | ||
440 | /* Bind with the destination and its corresponding transmitter */ | |
b209639e RB |
441 | if ((cp->flags & IP_VS_CONN_F_SYNC) && |
442 | (!(cp->flags & IP_VS_CONN_F_TEMPLATE))) | |
443 | /* if the connection is not template and is created | |
444 | * by sync, preserve the activity flag. | |
445 | */ | |
446 | cp->flags |= atomic_read(&dest->conn_flags) & | |
447 | (~IP_VS_CONN_F_INACTIVE); | |
448 | else | |
449 | cp->flags |= atomic_read(&dest->conn_flags); | |
1da177e4 LT |
450 | cp->dest = dest; |
451 | ||
cfc78c5a JV |
452 | IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d " |
453 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
454 | "dest->refcnt:%d\n", | |
455 | ip_vs_proto_name(cp->protocol), | |
456 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
457 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
458 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
459 | ip_vs_fwd_tag(cp), cp->state, | |
460 | cp->flags, atomic_read(&cp->refcnt), | |
461 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
462 | |
463 | /* Update the connection counters */ | |
87375ab4 | 464 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
465 | /* It is a normal connection, so increase the inactive |
466 | connection counter because it is in TCP SYNRECV | |
467 | state (inactive) or other protocol inacive state */ | |
b209639e RB |
468 | if ((cp->flags & IP_VS_CONN_F_SYNC) && |
469 | (!(cp->flags & IP_VS_CONN_F_INACTIVE))) | |
470 | atomic_inc(&dest->activeconns); | |
471 | else | |
472 | atomic_inc(&dest->inactconns); | |
1da177e4 LT |
473 | } else { |
474 | /* It is a persistent connection/template, so increase | |
475 | the peristent connection counter */ | |
476 | atomic_inc(&dest->persistconns); | |
477 | } | |
478 | ||
479 | if (dest->u_threshold != 0 && | |
480 | ip_vs_dest_totalconns(dest) >= dest->u_threshold) | |
481 | dest->flags |= IP_VS_DEST_F_OVERLOAD; | |
482 | } | |
483 | ||
484 | ||
1e356f9c RB |
485 | /* |
486 | * Check if there is a destination for the connection, if so | |
487 | * bind the connection to the destination. | |
488 | */ | |
489 | struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp) | |
490 | { | |
491 | struct ip_vs_dest *dest; | |
492 | ||
493 | if ((cp) && (!cp->dest)) { | |
7937df15 JV |
494 | dest = ip_vs_find_dest(cp->af, &cp->daddr, cp->dport, |
495 | &cp->vaddr, cp->vport, | |
496 | cp->protocol); | |
1e356f9c RB |
497 | ip_vs_bind_dest(cp, dest); |
498 | return dest; | |
499 | } else | |
500 | return NULL; | |
501 | } | |
1e356f9c RB |
502 | |
503 | ||
1da177e4 LT |
504 | /* |
505 | * Unbind a connection entry with its VS destination | |
506 | * Called by the ip_vs_conn_expire function. | |
507 | */ | |
508 | static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) | |
509 | { | |
510 | struct ip_vs_dest *dest = cp->dest; | |
511 | ||
512 | if (!dest) | |
513 | return; | |
514 | ||
cfc78c5a JV |
515 | IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d " |
516 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
517 | "dest->refcnt:%d\n", | |
518 | ip_vs_proto_name(cp->protocol), | |
519 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
520 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
521 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
522 | ip_vs_fwd_tag(cp), cp->state, | |
523 | cp->flags, atomic_read(&cp->refcnt), | |
524 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
525 | |
526 | /* Update the connection counters */ | |
87375ab4 | 527 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
528 | /* It is a normal connection, so decrease the inactconns |
529 | or activeconns counter */ | |
530 | if (cp->flags & IP_VS_CONN_F_INACTIVE) { | |
531 | atomic_dec(&dest->inactconns); | |
532 | } else { | |
533 | atomic_dec(&dest->activeconns); | |
534 | } | |
535 | } else { | |
536 | /* It is a persistent connection/template, so decrease | |
537 | the peristent connection counter */ | |
538 | atomic_dec(&dest->persistconns); | |
539 | } | |
540 | ||
541 | if (dest->l_threshold != 0) { | |
542 | if (ip_vs_dest_totalconns(dest) < dest->l_threshold) | |
543 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
544 | } else if (dest->u_threshold != 0) { | |
545 | if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) | |
546 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
547 | } else { | |
548 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
549 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
550 | } | |
551 | ||
552 | /* | |
553 | * Simply decrease the refcnt of the dest, because the | |
554 | * dest will be either in service's destination list | |
555 | * or in the trash. | |
556 | */ | |
557 | atomic_dec(&dest->refcnt); | |
558 | } | |
559 | ||
560 | ||
561 | /* | |
562 | * Checking if the destination of a connection template is available. | |
563 | * If available, return 1, otherwise invalidate this connection | |
564 | * template and return 0. | |
565 | */ | |
566 | int ip_vs_check_template(struct ip_vs_conn *ct) | |
567 | { | |
568 | struct ip_vs_dest *dest = ct->dest; | |
569 | ||
570 | /* | |
571 | * Checking the dest server status. | |
572 | */ | |
573 | if ((dest == NULL) || | |
e905a9ed YH |
574 | !(dest->flags & IP_VS_DEST_F_AVAILABLE) || |
575 | (sysctl_ip_vs_expire_quiescent_template && | |
1da177e4 | 576 | (atomic_read(&dest->weight) == 0))) { |
cfc78c5a JV |
577 | IP_VS_DBG_BUF(9, "check_template: dest not available for " |
578 | "protocol %s s:%s:%d v:%s:%d " | |
579 | "-> d:%s:%d\n", | |
580 | ip_vs_proto_name(ct->protocol), | |
581 | IP_VS_DBG_ADDR(ct->af, &ct->caddr), | |
582 | ntohs(ct->cport), | |
583 | IP_VS_DBG_ADDR(ct->af, &ct->vaddr), | |
584 | ntohs(ct->vport), | |
585 | IP_VS_DBG_ADDR(ct->af, &ct->daddr), | |
586 | ntohs(ct->dport)); | |
1da177e4 LT |
587 | |
588 | /* | |
589 | * Invalidate the connection template | |
590 | */ | |
014d730d | 591 | if (ct->vport != htons(0xffff)) { |
1da177e4 | 592 | if (ip_vs_conn_unhash(ct)) { |
014d730d AV |
593 | ct->dport = htons(0xffff); |
594 | ct->vport = htons(0xffff); | |
1da177e4 LT |
595 | ct->cport = 0; |
596 | ip_vs_conn_hash(ct); | |
597 | } | |
598 | } | |
599 | ||
600 | /* | |
601 | * Simply decrease the refcnt of the template, | |
602 | * don't restart its timer. | |
603 | */ | |
604 | atomic_dec(&ct->refcnt); | |
605 | return 0; | |
606 | } | |
607 | return 1; | |
608 | } | |
609 | ||
610 | static void ip_vs_conn_expire(unsigned long data) | |
611 | { | |
612 | struct ip_vs_conn *cp = (struct ip_vs_conn *)data; | |
613 | ||
614 | cp->timeout = 60*HZ; | |
615 | ||
616 | /* | |
617 | * hey, I'm using it | |
618 | */ | |
619 | atomic_inc(&cp->refcnt); | |
620 | ||
621 | /* | |
622 | * do I control anybody? | |
623 | */ | |
624 | if (atomic_read(&cp->n_control)) | |
625 | goto expire_later; | |
626 | ||
627 | /* | |
628 | * unhash it if it is hashed in the conn table | |
629 | */ | |
630 | if (!ip_vs_conn_unhash(cp)) | |
631 | goto expire_later; | |
632 | ||
633 | /* | |
634 | * refcnt==1 implies I'm the only one referrer | |
635 | */ | |
636 | if (likely(atomic_read(&cp->refcnt) == 1)) { | |
637 | /* delete the timer if it is activated by other users */ | |
638 | if (timer_pending(&cp->timer)) | |
639 | del_timer(&cp->timer); | |
640 | ||
641 | /* does anybody control me? */ | |
642 | if (cp->control) | |
643 | ip_vs_control_del(cp); | |
644 | ||
645 | if (unlikely(cp->app != NULL)) | |
646 | ip_vs_unbind_app(cp); | |
647 | ip_vs_unbind_dest(cp); | |
648 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) | |
649 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
650 | atomic_dec(&ip_vs_conn_count); | |
651 | ||
652 | kmem_cache_free(ip_vs_conn_cachep, cp); | |
653 | return; | |
654 | } | |
655 | ||
656 | /* hash it back to the table */ | |
657 | ip_vs_conn_hash(cp); | |
658 | ||
659 | expire_later: | |
4b5bdf5c | 660 | IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n", |
1da177e4 LT |
661 | atomic_read(&cp->refcnt)-1, |
662 | atomic_read(&cp->n_control)); | |
663 | ||
664 | ip_vs_conn_put(cp); | |
665 | } | |
666 | ||
667 | ||
668 | void ip_vs_conn_expire_now(struct ip_vs_conn *cp) | |
669 | { | |
670 | if (del_timer(&cp->timer)) | |
671 | mod_timer(&cp->timer, jiffies); | |
1da177e4 LT |
672 | } |
673 | ||
674 | ||
675 | /* | |
676 | * Create a new connection entry and hash it into the ip_vs_conn_tab | |
677 | */ | |
678 | struct ip_vs_conn * | |
28364a59 JV |
679 | ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport, |
680 | const union nf_inet_addr *vaddr, __be16 vport, | |
681 | const union nf_inet_addr *daddr, __be16 dport, unsigned flags, | |
1da177e4 LT |
682 | struct ip_vs_dest *dest) |
683 | { | |
684 | struct ip_vs_conn *cp; | |
685 | struct ip_vs_protocol *pp = ip_vs_proto_get(proto); | |
686 | ||
c3762229 | 687 | cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC); |
1da177e4 LT |
688 | if (cp == NULL) { |
689 | IP_VS_ERR_RL("ip_vs_conn_new: no memory available.\n"); | |
690 | return NULL; | |
691 | } | |
692 | ||
1da177e4 | 693 | INIT_LIST_HEAD(&cp->c_list); |
b24b8a24 | 694 | setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp); |
28364a59 | 695 | cp->af = af; |
1da177e4 | 696 | cp->protocol = proto; |
28364a59 | 697 | ip_vs_addr_copy(af, &cp->caddr, caddr); |
1da177e4 | 698 | cp->cport = cport; |
28364a59 | 699 | ip_vs_addr_copy(af, &cp->vaddr, vaddr); |
1da177e4 | 700 | cp->vport = vport; |
28364a59 | 701 | ip_vs_addr_copy(af, &cp->daddr, daddr); |
1da177e4 LT |
702 | cp->dport = dport; |
703 | cp->flags = flags; | |
704 | spin_lock_init(&cp->lock); | |
705 | ||
706 | /* | |
707 | * Set the entry is referenced by the current thread before hashing | |
708 | * it in the table, so that other thread run ip_vs_random_dropentry | |
709 | * but cannot drop this entry. | |
710 | */ | |
711 | atomic_set(&cp->refcnt, 1); | |
712 | ||
713 | atomic_set(&cp->n_control, 0); | |
714 | atomic_set(&cp->in_pkts, 0); | |
715 | ||
716 | atomic_inc(&ip_vs_conn_count); | |
717 | if (flags & IP_VS_CONN_F_NO_CPORT) | |
718 | atomic_inc(&ip_vs_conn_no_cport_cnt); | |
719 | ||
720 | /* Bind the connection with a destination server */ | |
721 | ip_vs_bind_dest(cp, dest); | |
722 | ||
723 | /* Set its state and timeout */ | |
724 | cp->state = 0; | |
725 | cp->timeout = 3*HZ; | |
726 | ||
727 | /* Bind its packet transmitter */ | |
b3cdd2a7 JV |
728 | #ifdef CONFIG_IP_VS_IPV6 |
729 | if (af == AF_INET6) | |
730 | ip_vs_bind_xmit_v6(cp); | |
731 | else | |
732 | #endif | |
733 | ip_vs_bind_xmit(cp); | |
1da177e4 LT |
734 | |
735 | if (unlikely(pp && atomic_read(&pp->appcnt))) | |
736 | ip_vs_bind_app(cp, pp); | |
737 | ||
738 | /* Hash it in the ip_vs_conn_tab finally */ | |
739 | ip_vs_conn_hash(cp); | |
740 | ||
741 | return cp; | |
742 | } | |
743 | ||
744 | ||
745 | /* | |
746 | * /proc/net/ip_vs_conn entries | |
747 | */ | |
748 | #ifdef CONFIG_PROC_FS | |
749 | ||
750 | static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) | |
751 | { | |
752 | int idx; | |
753 | struct ip_vs_conn *cp; | |
e905a9ed | 754 | |
1da177e4 LT |
755 | for(idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) { |
756 | ct_read_lock_bh(idx); | |
757 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
758 | if (pos-- == 0) { | |
759 | seq->private = &ip_vs_conn_tab[idx]; | |
760 | return cp; | |
761 | } | |
762 | } | |
763 | ct_read_unlock_bh(idx); | |
764 | } | |
765 | ||
766 | return NULL; | |
767 | } | |
768 | ||
769 | static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) | |
770 | { | |
771 | seq->private = NULL; | |
772 | return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; | |
773 | } | |
774 | ||
775 | static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
776 | { | |
777 | struct ip_vs_conn *cp = v; | |
778 | struct list_head *e, *l = seq->private; | |
779 | int idx; | |
780 | ||
781 | ++*pos; | |
e905a9ed | 782 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
783 | return ip_vs_conn_array(seq, 0); |
784 | ||
785 | /* more on same hash chain? */ | |
786 | if ((e = cp->c_list.next) != l) | |
787 | return list_entry(e, struct ip_vs_conn, c_list); | |
788 | ||
789 | idx = l - ip_vs_conn_tab; | |
790 | ct_read_unlock_bh(idx); | |
791 | ||
792 | while (++idx < IP_VS_CONN_TAB_SIZE) { | |
793 | ct_read_lock_bh(idx); | |
794 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
795 | seq->private = &ip_vs_conn_tab[idx]; | |
796 | return cp; | |
e905a9ed | 797 | } |
1da177e4 LT |
798 | ct_read_unlock_bh(idx); |
799 | } | |
800 | seq->private = NULL; | |
801 | return NULL; | |
802 | } | |
803 | ||
804 | static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) | |
805 | { | |
806 | struct list_head *l = seq->private; | |
807 | ||
808 | if (l) | |
809 | ct_read_unlock_bh(l - ip_vs_conn_tab); | |
810 | } | |
811 | ||
812 | static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) | |
813 | { | |
814 | ||
815 | if (v == SEQ_START_TOKEN) | |
816 | seq_puts(seq, | |
817 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires\n"); | |
818 | else { | |
819 | const struct ip_vs_conn *cp = v; | |
820 | ||
667a5f18 VB |
821 | #ifdef CONFIG_IP_VS_IPV6 |
822 | if (cp->af == AF_INET6) | |
38ff4fa4 | 823 | seq_printf(seq, "%-3s %p6 %04X %p6 %04X %p6 %04X %-11s %7lu\n", |
667a5f18 | 824 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
825 | &cp->caddr.in6, ntohs(cp->cport), |
826 | &cp->vaddr.in6, ntohs(cp->vport), | |
827 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 VB |
828 | ip_vs_state_name(cp->protocol, cp->state), |
829 | (cp->timer.expires-jiffies)/HZ); | |
830 | else | |
831 | #endif | |
832 | seq_printf(seq, | |
833 | "%-3s %08X %04X %08X %04X" | |
834 | " %08X %04X %-11s %7lu\n", | |
1da177e4 | 835 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
836 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
837 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
838 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
1da177e4 LT |
839 | ip_vs_state_name(cp->protocol, cp->state), |
840 | (cp->timer.expires-jiffies)/HZ); | |
841 | } | |
842 | return 0; | |
843 | } | |
844 | ||
56b3d975 | 845 | static const struct seq_operations ip_vs_conn_seq_ops = { |
1da177e4 LT |
846 | .start = ip_vs_conn_seq_start, |
847 | .next = ip_vs_conn_seq_next, | |
848 | .stop = ip_vs_conn_seq_stop, | |
849 | .show = ip_vs_conn_seq_show, | |
850 | }; | |
851 | ||
852 | static int ip_vs_conn_open(struct inode *inode, struct file *file) | |
853 | { | |
854 | return seq_open(file, &ip_vs_conn_seq_ops); | |
855 | } | |
856 | ||
9a32144e | 857 | static const struct file_operations ip_vs_conn_fops = { |
1da177e4 LT |
858 | .owner = THIS_MODULE, |
859 | .open = ip_vs_conn_open, | |
860 | .read = seq_read, | |
861 | .llseek = seq_lseek, | |
862 | .release = seq_release, | |
863 | }; | |
7a4fbb1f RB |
864 | |
865 | static const char *ip_vs_origin_name(unsigned flags) | |
866 | { | |
867 | if (flags & IP_VS_CONN_F_SYNC) | |
868 | return "SYNC"; | |
869 | else | |
870 | return "LOCAL"; | |
871 | } | |
872 | ||
873 | static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) | |
874 | { | |
875 | ||
876 | if (v == SEQ_START_TOKEN) | |
877 | seq_puts(seq, | |
878 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); | |
879 | else { | |
880 | const struct ip_vs_conn *cp = v; | |
881 | ||
667a5f18 VB |
882 | #ifdef CONFIG_IP_VS_IPV6 |
883 | if (cp->af == AF_INET6) | |
38ff4fa4 | 884 | seq_printf(seq, "%-3s %p6 %04X %p6 %04X %p6 %04X %-11s %-6s %7lu\n", |
667a5f18 | 885 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
886 | &cp->caddr.in6, ntohs(cp->cport), |
887 | &cp->vaddr.in6, ntohs(cp->vport), | |
888 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 VB |
889 | ip_vs_state_name(cp->protocol, cp->state), |
890 | ip_vs_origin_name(cp->flags), | |
891 | (cp->timer.expires-jiffies)/HZ); | |
892 | else | |
893 | #endif | |
894 | seq_printf(seq, | |
895 | "%-3s %08X %04X %08X %04X " | |
896 | "%08X %04X %-11s %-6s %7lu\n", | |
7a4fbb1f | 897 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
898 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
899 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
900 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
7a4fbb1f RB |
901 | ip_vs_state_name(cp->protocol, cp->state), |
902 | ip_vs_origin_name(cp->flags), | |
903 | (cp->timer.expires-jiffies)/HZ); | |
904 | } | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static const struct seq_operations ip_vs_conn_sync_seq_ops = { | |
909 | .start = ip_vs_conn_seq_start, | |
910 | .next = ip_vs_conn_seq_next, | |
911 | .stop = ip_vs_conn_seq_stop, | |
912 | .show = ip_vs_conn_sync_seq_show, | |
913 | }; | |
914 | ||
915 | static int ip_vs_conn_sync_open(struct inode *inode, struct file *file) | |
916 | { | |
917 | return seq_open(file, &ip_vs_conn_sync_seq_ops); | |
918 | } | |
919 | ||
920 | static const struct file_operations ip_vs_conn_sync_fops = { | |
921 | .owner = THIS_MODULE, | |
922 | .open = ip_vs_conn_sync_open, | |
923 | .read = seq_read, | |
924 | .llseek = seq_lseek, | |
925 | .release = seq_release, | |
926 | }; | |
927 | ||
1da177e4 LT |
928 | #endif |
929 | ||
930 | ||
931 | /* | |
932 | * Randomly drop connection entries before running out of memory | |
933 | */ | |
934 | static inline int todrop_entry(struct ip_vs_conn *cp) | |
935 | { | |
936 | /* | |
937 | * The drop rate array needs tuning for real environments. | |
938 | * Called from timer bh only => no locking | |
939 | */ | |
9b5b5cff | 940 | static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; |
1da177e4 LT |
941 | static char todrop_counter[9] = {0}; |
942 | int i; | |
943 | ||
944 | /* if the conn entry hasn't lasted for 60 seconds, don't drop it. | |
945 | This will leave enough time for normal connection to get | |
946 | through. */ | |
947 | if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) | |
948 | return 0; | |
949 | ||
950 | /* Don't drop the entry if its number of incoming packets is not | |
951 | located in [0, 8] */ | |
952 | i = atomic_read(&cp->in_pkts); | |
953 | if (i > 8 || i < 0) return 0; | |
954 | ||
955 | if (!todrop_rate[i]) return 0; | |
956 | if (--todrop_counter[i] > 0) return 0; | |
957 | ||
958 | todrop_counter[i] = todrop_rate[i]; | |
959 | return 1; | |
960 | } | |
961 | ||
af9debd4 | 962 | /* Called from keventd and must protect itself from softirqs */ |
1da177e4 LT |
963 | void ip_vs_random_dropentry(void) |
964 | { | |
965 | int idx; | |
966 | struct ip_vs_conn *cp; | |
1da177e4 LT |
967 | |
968 | /* | |
969 | * Randomly scan 1/32 of the whole table every second | |
970 | */ | |
971 | for (idx = 0; idx < (IP_VS_CONN_TAB_SIZE>>5); idx++) { | |
972 | unsigned hash = net_random() & IP_VS_CONN_TAB_MASK; | |
973 | ||
974 | /* | |
975 | * Lock is actually needed in this loop. | |
976 | */ | |
af9debd4 | 977 | ct_write_lock_bh(hash); |
1da177e4 LT |
978 | |
979 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
87375ab4 | 980 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) |
1da177e4 LT |
981 | /* connection template */ |
982 | continue; | |
983 | ||
984 | if (cp->protocol == IPPROTO_TCP) { | |
985 | switch(cp->state) { | |
986 | case IP_VS_TCP_S_SYN_RECV: | |
987 | case IP_VS_TCP_S_SYNACK: | |
988 | break; | |
989 | ||
990 | case IP_VS_TCP_S_ESTABLISHED: | |
991 | if (todrop_entry(cp)) | |
992 | break; | |
993 | continue; | |
994 | ||
995 | default: | |
996 | continue; | |
997 | } | |
998 | } else { | |
999 | if (!todrop_entry(cp)) | |
1000 | continue; | |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | IP_VS_DBG(4, "del connection\n"); |
1004 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1005 | if (cp->control) { |
1da177e4 | 1006 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1007 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1008 | } |
1da177e4 | 1009 | } |
af9debd4 | 1010 | ct_write_unlock_bh(hash); |
1da177e4 LT |
1011 | } |
1012 | } | |
1013 | ||
1014 | ||
1015 | /* | |
1016 | * Flush all the connection entries in the ip_vs_conn_tab | |
1017 | */ | |
1018 | static void ip_vs_conn_flush(void) | |
1019 | { | |
1020 | int idx; | |
1021 | struct ip_vs_conn *cp; | |
1da177e4 LT |
1022 | |
1023 | flush_again: | |
1024 | for (idx=0; idx<IP_VS_CONN_TAB_SIZE; idx++) { | |
1025 | /* | |
1026 | * Lock is actually needed in this loop. | |
1027 | */ | |
1028 | ct_write_lock_bh(idx); | |
1029 | ||
1030 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
1da177e4 | 1031 | |
1da177e4 LT |
1032 | IP_VS_DBG(4, "del connection\n"); |
1033 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1034 | if (cp->control) { |
1da177e4 | 1035 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1036 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1037 | } |
1da177e4 LT |
1038 | } |
1039 | ct_write_unlock_bh(idx); | |
1040 | } | |
1041 | ||
1042 | /* the counter may be not NULL, because maybe some conn entries | |
1043 | are run by slow timer handler or unhashed but still referred */ | |
1044 | if (atomic_read(&ip_vs_conn_count) != 0) { | |
1045 | schedule(); | |
1046 | goto flush_again; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | ||
048cf48b | 1051 | int __init ip_vs_conn_init(void) |
1da177e4 LT |
1052 | { |
1053 | int idx; | |
1054 | ||
1055 | /* | |
1056 | * Allocate the connection hash table and initialize its list heads | |
1057 | */ | |
1058 | ip_vs_conn_tab = vmalloc(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head)); | |
1059 | if (!ip_vs_conn_tab) | |
1060 | return -ENOMEM; | |
1061 | ||
1062 | /* Allocate ip_vs_conn slab cache */ | |
1063 | ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", | |
1064 | sizeof(struct ip_vs_conn), 0, | |
20c2df83 | 1065 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1066 | if (!ip_vs_conn_cachep) { |
1067 | vfree(ip_vs_conn_tab); | |
1068 | return -ENOMEM; | |
1069 | } | |
1070 | ||
1071 | IP_VS_INFO("Connection hash table configured " | |
1072 | "(size=%d, memory=%ldKbytes)\n", | |
1073 | IP_VS_CONN_TAB_SIZE, | |
1074 | (long)(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head))/1024); | |
1075 | IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n", | |
1076 | sizeof(struct ip_vs_conn)); | |
1077 | ||
1078 | for (idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) { | |
1079 | INIT_LIST_HEAD(&ip_vs_conn_tab[idx]); | |
1080 | } | |
1081 | ||
1082 | for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { | |
1083 | rwlock_init(&__ip_vs_conntbl_lock_array[idx].l); | |
1084 | } | |
1085 | ||
457c4cbc | 1086 | proc_net_fops_create(&init_net, "ip_vs_conn", 0, &ip_vs_conn_fops); |
7a4fbb1f | 1087 | proc_net_fops_create(&init_net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops); |
1da177e4 LT |
1088 | |
1089 | /* calculate the random value for connection hash */ | |
1090 | get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | ||
1096 | void ip_vs_conn_cleanup(void) | |
1097 | { | |
1098 | /* flush all the connection entries first */ | |
1099 | ip_vs_conn_flush(); | |
1100 | ||
1101 | /* Release the empty cache */ | |
1102 | kmem_cache_destroy(ip_vs_conn_cachep); | |
457c4cbc | 1103 | proc_net_remove(&init_net, "ip_vs_conn"); |
7a4fbb1f | 1104 | proc_net_remove(&init_net, "ip_vs_conn_sync"); |
1da177e4 LT |
1105 | vfree(ip_vs_conn_tab); |
1106 | } |