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