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