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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 | ||
85999283 SH |
151 | static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p, |
152 | bool inverse) | |
153 | { | |
154 | const union nf_inet_addr *addr; | |
155 | __be16 port; | |
156 | ||
f71499aa | 157 | if (p->pe_data && p->pe->hashkey_raw) |
85999283 SH |
158 | return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) & |
159 | ip_vs_conn_tab_mask; | |
160 | ||
161 | if (likely(!inverse)) { | |
162 | addr = p->caddr; | |
163 | port = p->cport; | |
164 | } else { | |
165 | addr = p->vaddr; | |
166 | port = p->vport; | |
167 | } | |
168 | ||
169 | return ip_vs_conn_hashkey(p->af, p->protocol, addr, port); | |
170 | } | |
171 | ||
172 | static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp) | |
173 | { | |
174 | struct ip_vs_conn_param p; | |
175 | ||
176 | ip_vs_conn_fill_param(cp->af, cp->protocol, &cp->caddr, cp->cport, | |
177 | NULL, 0, &p); | |
178 | ||
179 | if (cp->dest && cp->dest->svc->pe) { | |
180 | p.pe = cp->dest->svc->pe; | |
181 | p.pe_data = cp->pe_data; | |
182 | p.pe_data_len = cp->pe_data_len; | |
183 | } | |
184 | ||
185 | return ip_vs_conn_hashkey_param(&p, false); | |
186 | } | |
1da177e4 LT |
187 | |
188 | /* | |
189 | * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port. | |
190 | * returns bool success. | |
191 | */ | |
192 | static inline int ip_vs_conn_hash(struct ip_vs_conn *cp) | |
193 | { | |
194 | unsigned hash; | |
195 | int ret; | |
196 | ||
26ec037f NC |
197 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
198 | return 0; | |
199 | ||
1da177e4 | 200 | /* Hash by protocol, client address and port */ |
85999283 | 201 | hash = ip_vs_conn_hashkey_conn(cp); |
1da177e4 LT |
202 | |
203 | ct_write_lock(hash); | |
aea9d711 | 204 | spin_lock(&cp->lock); |
1da177e4 LT |
205 | |
206 | if (!(cp->flags & IP_VS_CONN_F_HASHED)) { | |
207 | list_add(&cp->c_list, &ip_vs_conn_tab[hash]); | |
208 | cp->flags |= IP_VS_CONN_F_HASHED; | |
209 | atomic_inc(&cp->refcnt); | |
210 | ret = 1; | |
211 | } else { | |
1e3e238e HE |
212 | pr_err("%s(): request for already hashed, called from %pF\n", |
213 | __func__, __builtin_return_address(0)); | |
1da177e4 LT |
214 | ret = 0; |
215 | } | |
216 | ||
aea9d711 | 217 | spin_unlock(&cp->lock); |
1da177e4 LT |
218 | ct_write_unlock(hash); |
219 | ||
220 | return ret; | |
221 | } | |
222 | ||
223 | ||
224 | /* | |
225 | * UNhashes ip_vs_conn from ip_vs_conn_tab. | |
226 | * returns bool success. | |
227 | */ | |
228 | static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp) | |
229 | { | |
230 | unsigned hash; | |
231 | int ret; | |
232 | ||
233 | /* unhash it and decrease its reference counter */ | |
85999283 | 234 | hash = ip_vs_conn_hashkey_conn(cp); |
1da177e4 LT |
235 | |
236 | ct_write_lock(hash); | |
aea9d711 | 237 | spin_lock(&cp->lock); |
1da177e4 LT |
238 | |
239 | if (cp->flags & IP_VS_CONN_F_HASHED) { | |
240 | list_del(&cp->c_list); | |
241 | cp->flags &= ~IP_VS_CONN_F_HASHED; | |
242 | atomic_dec(&cp->refcnt); | |
243 | ret = 1; | |
244 | } else | |
245 | ret = 0; | |
246 | ||
aea9d711 | 247 | spin_unlock(&cp->lock); |
1da177e4 LT |
248 | ct_write_unlock(hash); |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
253 | ||
254 | /* | |
255 | * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. | |
256 | * Called for pkts coming from OUTside-to-INside. | |
f11017ec SH |
257 | * p->caddr, p->cport: pkt source address (foreign host) |
258 | * p->vaddr, p->vport: pkt dest address (load balancer) | |
1da177e4 | 259 | */ |
f11017ec SH |
260 | static inline struct ip_vs_conn * |
261 | __ip_vs_conn_in_get(const struct ip_vs_conn_param *p) | |
1da177e4 LT |
262 | { |
263 | unsigned hash; | |
264 | struct ip_vs_conn *cp; | |
265 | ||
85999283 | 266 | hash = ip_vs_conn_hashkey_param(p, false); |
1da177e4 LT |
267 | |
268 | ct_read_lock(hash); | |
269 | ||
270 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
f11017ec SH |
271 | if (cp->af == p->af && |
272 | ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && | |
273 | ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) && | |
274 | p->cport == cp->cport && p->vport == cp->vport && | |
275 | ((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) && | |
276 | p->protocol == cp->protocol) { | |
1da177e4 LT |
277 | /* HIT */ |
278 | atomic_inc(&cp->refcnt); | |
279 | ct_read_unlock(hash); | |
280 | return cp; | |
281 | } | |
282 | } | |
283 | ||
284 | ct_read_unlock(hash); | |
285 | ||
286 | return NULL; | |
287 | } | |
288 | ||
f11017ec | 289 | struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p) |
1da177e4 LT |
290 | { |
291 | struct ip_vs_conn *cp; | |
292 | ||
f11017ec SH |
293 | cp = __ip_vs_conn_in_get(p); |
294 | if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) { | |
295 | struct ip_vs_conn_param cport_zero_p = *p; | |
296 | cport_zero_p.cport = 0; | |
297 | cp = __ip_vs_conn_in_get(&cport_zero_p); | |
298 | } | |
1da177e4 | 299 | |
28364a59 | 300 | IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n", |
f11017ec SH |
301 | ip_vs_proto_name(p->protocol), |
302 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
303 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 304 | cp ? "hit" : "not hit"); |
1da177e4 LT |
305 | |
306 | return cp; | |
307 | } | |
308 | ||
f11017ec SH |
309 | static int |
310 | ip_vs_conn_fill_param_proto(int af, const struct sk_buff *skb, | |
311 | const struct ip_vs_iphdr *iph, | |
312 | unsigned int proto_off, int inverse, | |
313 | struct ip_vs_conn_param *p) | |
314 | { | |
315 | __be16 _ports[2], *pptr; | |
316 | ||
317 | pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); | |
318 | if (pptr == NULL) | |
319 | return 1; | |
320 | ||
321 | if (likely(!inverse)) | |
322 | ip_vs_conn_fill_param(af, iph->protocol, &iph->saddr, pptr[0], | |
323 | &iph->daddr, pptr[1], p); | |
324 | else | |
325 | ip_vs_conn_fill_param(af, iph->protocol, &iph->daddr, pptr[1], | |
326 | &iph->saddr, pptr[0], p); | |
327 | return 0; | |
328 | } | |
329 | ||
5c0d2374 SH |
330 | struct ip_vs_conn * |
331 | ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb, | |
332 | struct ip_vs_protocol *pp, | |
333 | const struct ip_vs_iphdr *iph, | |
334 | unsigned int proto_off, int inverse) | |
335 | { | |
f11017ec | 336 | struct ip_vs_conn_param p; |
5c0d2374 | 337 | |
f11017ec | 338 | if (ip_vs_conn_fill_param_proto(af, skb, iph, proto_off, inverse, &p)) |
5c0d2374 SH |
339 | return NULL; |
340 | ||
f11017ec | 341 | return ip_vs_conn_in_get(&p); |
5c0d2374 SH |
342 | } |
343 | EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto); | |
344 | ||
87375ab4 | 345 | /* Get reference to connection template */ |
f11017ec | 346 | struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p) |
87375ab4 JA |
347 | { |
348 | unsigned hash; | |
349 | struct ip_vs_conn *cp; | |
350 | ||
85999283 | 351 | hash = ip_vs_conn_hashkey_param(p, false); |
87375ab4 JA |
352 | |
353 | ct_read_lock(hash); | |
354 | ||
355 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
f71499aa | 356 | if (p->pe_data && p->pe->ct_match) { |
85999283 SH |
357 | if (p->pe->ct_match(p, cp)) |
358 | goto out; | |
359 | continue; | |
360 | } | |
361 | ||
f11017ec SH |
362 | if (cp->af == p->af && |
363 | ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && | |
be8be9ec | 364 | /* protocol should only be IPPROTO_IP if |
f11017ec SH |
365 | * p->vaddr is a fwmark */ |
366 | ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC : | |
367 | p->af, p->vaddr, &cp->vaddr) && | |
368 | p->cport == cp->cport && p->vport == cp->vport && | |
87375ab4 | 369 | cp->flags & IP_VS_CONN_F_TEMPLATE && |
85999283 | 370 | p->protocol == cp->protocol) |
87375ab4 | 371 | goto out; |
87375ab4 JA |
372 | } |
373 | cp = NULL; | |
374 | ||
375 | out: | |
85999283 SH |
376 | if (cp) |
377 | atomic_inc(&cp->refcnt); | |
87375ab4 JA |
378 | ct_read_unlock(hash); |
379 | ||
28364a59 | 380 | IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n", |
f11017ec SH |
381 | ip_vs_proto_name(p->protocol), |
382 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
383 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 384 | cp ? "hit" : "not hit"); |
87375ab4 JA |
385 | |
386 | return cp; | |
387 | } | |
1da177e4 | 388 | |
f11017ec SH |
389 | /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. |
390 | * Called for pkts coming from inside-to-OUTside. | |
391 | * p->caddr, p->cport: pkt source address (inside host) | |
392 | * p->vaddr, p->vport: pkt dest address (foreign host) */ | |
393 | struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p) | |
1da177e4 LT |
394 | { |
395 | unsigned hash; | |
396 | struct ip_vs_conn *cp, *ret=NULL; | |
397 | ||
398 | /* | |
399 | * Check for "full" addressed entries | |
400 | */ | |
85999283 | 401 | hash = ip_vs_conn_hashkey_param(p, true); |
1da177e4 LT |
402 | |
403 | ct_read_lock(hash); | |
404 | ||
405 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
f11017ec SH |
406 | if (cp->af == p->af && |
407 | ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) && | |
408 | ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) && | |
409 | p->vport == cp->cport && p->cport == cp->dport && | |
410 | p->protocol == cp->protocol) { | |
1da177e4 LT |
411 | /* HIT */ |
412 | atomic_inc(&cp->refcnt); | |
413 | ret = cp; | |
414 | break; | |
415 | } | |
416 | } | |
417 | ||
418 | ct_read_unlock(hash); | |
419 | ||
28364a59 | 420 | IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n", |
f11017ec SH |
421 | ip_vs_proto_name(p->protocol), |
422 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
423 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 424 | ret ? "hit" : "not hit"); |
1da177e4 LT |
425 | |
426 | return ret; | |
427 | } | |
428 | ||
5c0d2374 SH |
429 | struct ip_vs_conn * |
430 | ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, | |
431 | struct ip_vs_protocol *pp, | |
432 | const struct ip_vs_iphdr *iph, | |
433 | unsigned int proto_off, int inverse) | |
434 | { | |
f11017ec | 435 | struct ip_vs_conn_param p; |
5c0d2374 | 436 | |
f11017ec | 437 | if (ip_vs_conn_fill_param_proto(af, skb, iph, proto_off, inverse, &p)) |
5c0d2374 SH |
438 | return NULL; |
439 | ||
f11017ec | 440 | return ip_vs_conn_out_get(&p); |
5c0d2374 SH |
441 | } |
442 | EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto); | |
1da177e4 LT |
443 | |
444 | /* | |
445 | * Put back the conn and restart its timer with its timeout | |
446 | */ | |
447 | void ip_vs_conn_put(struct ip_vs_conn *cp) | |
448 | { | |
26ec037f NC |
449 | unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ? |
450 | 0 : cp->timeout; | |
451 | mod_timer(&cp->timer, jiffies+t); | |
1da177e4 LT |
452 | |
453 | __ip_vs_conn_put(cp); | |
454 | } | |
455 | ||
456 | ||
457 | /* | |
458 | * Fill a no_client_port connection with a client port number | |
459 | */ | |
014d730d | 460 | void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) |
1da177e4 LT |
461 | { |
462 | if (ip_vs_conn_unhash(cp)) { | |
463 | spin_lock(&cp->lock); | |
464 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) { | |
465 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
466 | cp->flags &= ~IP_VS_CONN_F_NO_CPORT; | |
467 | cp->cport = cport; | |
468 | } | |
469 | spin_unlock(&cp->lock); | |
470 | ||
471 | /* hash on new dport */ | |
472 | ip_vs_conn_hash(cp); | |
473 | } | |
474 | } | |
475 | ||
476 | ||
477 | /* | |
478 | * Bind a connection entry with the corresponding packet_xmit. | |
479 | * Called by ip_vs_conn_new. | |
480 | */ | |
481 | static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) | |
482 | { | |
483 | switch (IP_VS_FWD_METHOD(cp)) { | |
484 | case IP_VS_CONN_F_MASQ: | |
485 | cp->packet_xmit = ip_vs_nat_xmit; | |
486 | break; | |
487 | ||
488 | case IP_VS_CONN_F_TUNNEL: | |
489 | cp->packet_xmit = ip_vs_tunnel_xmit; | |
490 | break; | |
491 | ||
492 | case IP_VS_CONN_F_DROUTE: | |
493 | cp->packet_xmit = ip_vs_dr_xmit; | |
494 | break; | |
495 | ||
496 | case IP_VS_CONN_F_LOCALNODE: | |
497 | cp->packet_xmit = ip_vs_null_xmit; | |
498 | break; | |
499 | ||
500 | case IP_VS_CONN_F_BYPASS: | |
501 | cp->packet_xmit = ip_vs_bypass_xmit; | |
502 | break; | |
503 | } | |
504 | } | |
505 | ||
b3cdd2a7 JV |
506 | #ifdef CONFIG_IP_VS_IPV6 |
507 | static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp) | |
508 | { | |
509 | switch (IP_VS_FWD_METHOD(cp)) { | |
510 | case IP_VS_CONN_F_MASQ: | |
511 | cp->packet_xmit = ip_vs_nat_xmit_v6; | |
512 | break; | |
513 | ||
514 | case IP_VS_CONN_F_TUNNEL: | |
515 | cp->packet_xmit = ip_vs_tunnel_xmit_v6; | |
516 | break; | |
517 | ||
518 | case IP_VS_CONN_F_DROUTE: | |
519 | cp->packet_xmit = ip_vs_dr_xmit_v6; | |
520 | break; | |
521 | ||
522 | case IP_VS_CONN_F_LOCALNODE: | |
523 | cp->packet_xmit = ip_vs_null_xmit; | |
524 | break; | |
525 | ||
526 | case IP_VS_CONN_F_BYPASS: | |
527 | cp->packet_xmit = ip_vs_bypass_xmit_v6; | |
528 | break; | |
529 | } | |
530 | } | |
531 | #endif | |
532 | ||
1da177e4 LT |
533 | |
534 | static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) | |
535 | { | |
536 | return atomic_read(&dest->activeconns) | |
537 | + atomic_read(&dest->inactconns); | |
538 | } | |
539 | ||
540 | /* | |
541 | * Bind a connection entry with a virtual service destination | |
542 | * Called just after a new connection entry is created. | |
543 | */ | |
544 | static inline void | |
545 | ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) | |
546 | { | |
3575792e JA |
547 | unsigned int conn_flags; |
548 | ||
1da177e4 LT |
549 | /* if dest is NULL, then return directly */ |
550 | if (!dest) | |
551 | return; | |
552 | ||
553 | /* Increase the refcnt counter of the dest */ | |
554 | atomic_inc(&dest->refcnt); | |
555 | ||
3575792e JA |
556 | conn_flags = atomic_read(&dest->conn_flags); |
557 | if (cp->protocol != IPPROTO_UDP) | |
558 | conn_flags &= ~IP_VS_CONN_F_ONE_PACKET; | |
1da177e4 | 559 | /* Bind with the destination and its corresponding transmitter */ |
3575792e | 560 | if (cp->flags & IP_VS_CONN_F_SYNC) { |
b209639e RB |
561 | /* if the connection is not template and is created |
562 | * by sync, preserve the activity flag. | |
563 | */ | |
3575792e JA |
564 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) |
565 | conn_flags &= ~IP_VS_CONN_F_INACTIVE; | |
3233759b JA |
566 | /* connections inherit forwarding method from dest */ |
567 | cp->flags &= ~IP_VS_CONN_F_FWD_MASK; | |
3575792e JA |
568 | } |
569 | cp->flags |= conn_flags; | |
1da177e4 LT |
570 | cp->dest = dest; |
571 | ||
cfc78c5a JV |
572 | IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d " |
573 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
574 | "dest->refcnt:%d\n", | |
575 | ip_vs_proto_name(cp->protocol), | |
576 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
577 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
578 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
579 | ip_vs_fwd_tag(cp), cp->state, | |
580 | cp->flags, atomic_read(&cp->refcnt), | |
581 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
582 | |
583 | /* Update the connection counters */ | |
87375ab4 | 584 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
585 | /* It is a normal connection, so increase the inactive |
586 | connection counter because it is in TCP SYNRECV | |
587 | state (inactive) or other protocol inacive state */ | |
b209639e RB |
588 | if ((cp->flags & IP_VS_CONN_F_SYNC) && |
589 | (!(cp->flags & IP_VS_CONN_F_INACTIVE))) | |
590 | atomic_inc(&dest->activeconns); | |
591 | else | |
592 | atomic_inc(&dest->inactconns); | |
1da177e4 LT |
593 | } else { |
594 | /* It is a persistent connection/template, so increase | |
595 | the peristent connection counter */ | |
596 | atomic_inc(&dest->persistconns); | |
597 | } | |
598 | ||
599 | if (dest->u_threshold != 0 && | |
600 | ip_vs_dest_totalconns(dest) >= dest->u_threshold) | |
601 | dest->flags |= IP_VS_DEST_F_OVERLOAD; | |
602 | } | |
603 | ||
604 | ||
1e356f9c RB |
605 | /* |
606 | * Check if there is a destination for the connection, if so | |
607 | * bind the connection to the destination. | |
608 | */ | |
609 | struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp) | |
610 | { | |
611 | struct ip_vs_dest *dest; | |
612 | ||
613 | if ((cp) && (!cp->dest)) { | |
7937df15 JV |
614 | dest = ip_vs_find_dest(cp->af, &cp->daddr, cp->dport, |
615 | &cp->vaddr, cp->vport, | |
616 | cp->protocol); | |
1e356f9c RB |
617 | ip_vs_bind_dest(cp, dest); |
618 | return dest; | |
619 | } else | |
620 | return NULL; | |
621 | } | |
1e356f9c RB |
622 | |
623 | ||
1da177e4 LT |
624 | /* |
625 | * Unbind a connection entry with its VS destination | |
626 | * Called by the ip_vs_conn_expire function. | |
627 | */ | |
628 | static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) | |
629 | { | |
630 | struct ip_vs_dest *dest = cp->dest; | |
631 | ||
632 | if (!dest) | |
633 | return; | |
634 | ||
cfc78c5a JV |
635 | IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d " |
636 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
637 | "dest->refcnt:%d\n", | |
638 | ip_vs_proto_name(cp->protocol), | |
639 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
640 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
641 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
642 | ip_vs_fwd_tag(cp), cp->state, | |
643 | cp->flags, atomic_read(&cp->refcnt), | |
644 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
645 | |
646 | /* Update the connection counters */ | |
87375ab4 | 647 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
648 | /* It is a normal connection, so decrease the inactconns |
649 | or activeconns counter */ | |
650 | if (cp->flags & IP_VS_CONN_F_INACTIVE) { | |
651 | atomic_dec(&dest->inactconns); | |
652 | } else { | |
653 | atomic_dec(&dest->activeconns); | |
654 | } | |
655 | } else { | |
656 | /* It is a persistent connection/template, so decrease | |
657 | the peristent connection counter */ | |
658 | atomic_dec(&dest->persistconns); | |
659 | } | |
660 | ||
661 | if (dest->l_threshold != 0) { | |
662 | if (ip_vs_dest_totalconns(dest) < dest->l_threshold) | |
663 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
664 | } else if (dest->u_threshold != 0) { | |
665 | if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) | |
666 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
667 | } else { | |
668 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
669 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
670 | } | |
671 | ||
672 | /* | |
673 | * Simply decrease the refcnt of the dest, because the | |
674 | * dest will be either in service's destination list | |
675 | * or in the trash. | |
676 | */ | |
677 | atomic_dec(&dest->refcnt); | |
678 | } | |
679 | ||
680 | ||
681 | /* | |
682 | * Checking if the destination of a connection template is available. | |
683 | * If available, return 1, otherwise invalidate this connection | |
684 | * template and return 0. | |
685 | */ | |
686 | int ip_vs_check_template(struct ip_vs_conn *ct) | |
687 | { | |
688 | struct ip_vs_dest *dest = ct->dest; | |
689 | ||
690 | /* | |
691 | * Checking the dest server status. | |
692 | */ | |
693 | if ((dest == NULL) || | |
e905a9ed YH |
694 | !(dest->flags & IP_VS_DEST_F_AVAILABLE) || |
695 | (sysctl_ip_vs_expire_quiescent_template && | |
1da177e4 | 696 | (atomic_read(&dest->weight) == 0))) { |
cfc78c5a JV |
697 | IP_VS_DBG_BUF(9, "check_template: dest not available for " |
698 | "protocol %s s:%s:%d v:%s:%d " | |
699 | "-> d:%s:%d\n", | |
700 | ip_vs_proto_name(ct->protocol), | |
701 | IP_VS_DBG_ADDR(ct->af, &ct->caddr), | |
702 | ntohs(ct->cport), | |
703 | IP_VS_DBG_ADDR(ct->af, &ct->vaddr), | |
704 | ntohs(ct->vport), | |
705 | IP_VS_DBG_ADDR(ct->af, &ct->daddr), | |
706 | ntohs(ct->dport)); | |
1da177e4 LT |
707 | |
708 | /* | |
709 | * Invalidate the connection template | |
710 | */ | |
014d730d | 711 | if (ct->vport != htons(0xffff)) { |
1da177e4 | 712 | if (ip_vs_conn_unhash(ct)) { |
014d730d AV |
713 | ct->dport = htons(0xffff); |
714 | ct->vport = htons(0xffff); | |
1da177e4 LT |
715 | ct->cport = 0; |
716 | ip_vs_conn_hash(ct); | |
717 | } | |
718 | } | |
719 | ||
720 | /* | |
721 | * Simply decrease the refcnt of the template, | |
722 | * don't restart its timer. | |
723 | */ | |
724 | atomic_dec(&ct->refcnt); | |
725 | return 0; | |
726 | } | |
727 | return 1; | |
728 | } | |
729 | ||
730 | static void ip_vs_conn_expire(unsigned long data) | |
731 | { | |
732 | struct ip_vs_conn *cp = (struct ip_vs_conn *)data; | |
733 | ||
734 | cp->timeout = 60*HZ; | |
735 | ||
736 | /* | |
737 | * hey, I'm using it | |
738 | */ | |
739 | atomic_inc(&cp->refcnt); | |
740 | ||
741 | /* | |
742 | * do I control anybody? | |
743 | */ | |
744 | if (atomic_read(&cp->n_control)) | |
745 | goto expire_later; | |
746 | ||
747 | /* | |
748 | * unhash it if it is hashed in the conn table | |
749 | */ | |
26ec037f | 750 | if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET)) |
1da177e4 LT |
751 | goto expire_later; |
752 | ||
753 | /* | |
754 | * refcnt==1 implies I'm the only one referrer | |
755 | */ | |
756 | if (likely(atomic_read(&cp->refcnt) == 1)) { | |
757 | /* delete the timer if it is activated by other users */ | |
758 | if (timer_pending(&cp->timer)) | |
759 | del_timer(&cp->timer); | |
760 | ||
761 | /* does anybody control me? */ | |
762 | if (cp->control) | |
763 | ip_vs_control_del(cp); | |
764 | ||
f4bc17cd JA |
765 | if (cp->flags & IP_VS_CONN_F_NFCT) |
766 | ip_vs_conn_drop_conntrack(cp); | |
767 | ||
85999283 | 768 | kfree(cp->pe_data); |
1da177e4 LT |
769 | if (unlikely(cp->app != NULL)) |
770 | ip_vs_unbind_app(cp); | |
771 | ip_vs_unbind_dest(cp); | |
772 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) | |
773 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
774 | atomic_dec(&ip_vs_conn_count); | |
775 | ||
776 | kmem_cache_free(ip_vs_conn_cachep, cp); | |
777 | return; | |
778 | } | |
779 | ||
780 | /* hash it back to the table */ | |
781 | ip_vs_conn_hash(cp); | |
782 | ||
783 | expire_later: | |
4b5bdf5c | 784 | IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n", |
1da177e4 LT |
785 | atomic_read(&cp->refcnt)-1, |
786 | atomic_read(&cp->n_control)); | |
787 | ||
788 | ip_vs_conn_put(cp); | |
789 | } | |
790 | ||
791 | ||
792 | void ip_vs_conn_expire_now(struct ip_vs_conn *cp) | |
793 | { | |
794 | if (del_timer(&cp->timer)) | |
795 | mod_timer(&cp->timer, jiffies); | |
1da177e4 LT |
796 | } |
797 | ||
798 | ||
799 | /* | |
800 | * Create a new connection entry and hash it into the ip_vs_conn_tab | |
801 | */ | |
802 | struct ip_vs_conn * | |
f11017ec | 803 | ip_vs_conn_new(const struct ip_vs_conn_param *p, |
28364a59 | 804 | const union nf_inet_addr *daddr, __be16 dport, unsigned flags, |
1da177e4 LT |
805 | struct ip_vs_dest *dest) |
806 | { | |
807 | struct ip_vs_conn *cp; | |
f11017ec | 808 | struct ip_vs_protocol *pp = ip_vs_proto_get(p->protocol); |
1da177e4 | 809 | |
c3762229 | 810 | cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC); |
1da177e4 | 811 | if (cp == NULL) { |
1e3e238e | 812 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
813 | return NULL; |
814 | } | |
815 | ||
1da177e4 | 816 | INIT_LIST_HEAD(&cp->c_list); |
b24b8a24 | 817 | setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp); |
f11017ec SH |
818 | cp->af = p->af; |
819 | cp->protocol = p->protocol; | |
820 | ip_vs_addr_copy(p->af, &cp->caddr, p->caddr); | |
821 | cp->cport = p->cport; | |
822 | ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr); | |
823 | cp->vport = p->vport; | |
be8be9ec | 824 | /* proto should only be IPPROTO_IP if d_addr is a fwmark */ |
f11017ec | 825 | ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af, |
be8be9ec | 826 | &cp->daddr, daddr); |
1da177e4 LT |
827 | cp->dport = dport; |
828 | cp->flags = flags; | |
85999283 SH |
829 | if (flags & IP_VS_CONN_F_TEMPLATE && p->pe_data) { |
830 | cp->pe_data = p->pe_data; | |
831 | cp->pe_data_len = p->pe_data_len; | |
832 | } | |
1da177e4 LT |
833 | spin_lock_init(&cp->lock); |
834 | ||
835 | /* | |
836 | * Set the entry is referenced by the current thread before hashing | |
837 | * it in the table, so that other thread run ip_vs_random_dropentry | |
838 | * but cannot drop this entry. | |
839 | */ | |
840 | atomic_set(&cp->refcnt, 1); | |
841 | ||
842 | atomic_set(&cp->n_control, 0); | |
843 | atomic_set(&cp->in_pkts, 0); | |
844 | ||
845 | atomic_inc(&ip_vs_conn_count); | |
846 | if (flags & IP_VS_CONN_F_NO_CPORT) | |
847 | atomic_inc(&ip_vs_conn_no_cport_cnt); | |
848 | ||
849 | /* Bind the connection with a destination server */ | |
850 | ip_vs_bind_dest(cp, dest); | |
851 | ||
852 | /* Set its state and timeout */ | |
853 | cp->state = 0; | |
854 | cp->timeout = 3*HZ; | |
855 | ||
856 | /* Bind its packet transmitter */ | |
b3cdd2a7 | 857 | #ifdef CONFIG_IP_VS_IPV6 |
f11017ec | 858 | if (p->af == AF_INET6) |
b3cdd2a7 JV |
859 | ip_vs_bind_xmit_v6(cp); |
860 | else | |
861 | #endif | |
862 | ip_vs_bind_xmit(cp); | |
1da177e4 LT |
863 | |
864 | if (unlikely(pp && atomic_read(&pp->appcnt))) | |
865 | ip_vs_bind_app(cp, pp); | |
866 | ||
f4bc17cd JA |
867 | /* |
868 | * Allow conntrack to be preserved. By default, conntrack | |
869 | * is created and destroyed for every packet. | |
870 | * Sometimes keeping conntrack can be useful for | |
871 | * IP_VS_CONN_F_ONE_PACKET too. | |
872 | */ | |
873 | ||
874 | if (ip_vs_conntrack_enabled()) | |
875 | cp->flags |= IP_VS_CONN_F_NFCT; | |
876 | ||
1da177e4 LT |
877 | /* Hash it in the ip_vs_conn_tab finally */ |
878 | ip_vs_conn_hash(cp); | |
879 | ||
880 | return cp; | |
881 | } | |
882 | ||
1da177e4 LT |
883 | /* |
884 | * /proc/net/ip_vs_conn entries | |
885 | */ | |
886 | #ifdef CONFIG_PROC_FS | |
887 | ||
888 | static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) | |
889 | { | |
890 | int idx; | |
891 | struct ip_vs_conn *cp; | |
e905a9ed | 892 | |
6f7edb48 | 893 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 LT |
894 | ct_read_lock_bh(idx); |
895 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
896 | if (pos-- == 0) { | |
897 | seq->private = &ip_vs_conn_tab[idx]; | |
85999283 | 898 | return cp; |
1da177e4 LT |
899 | } |
900 | } | |
901 | ct_read_unlock_bh(idx); | |
902 | } | |
903 | ||
904 | return NULL; | |
905 | } | |
906 | ||
907 | static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) | |
908 | { | |
909 | seq->private = NULL; | |
910 | return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; | |
911 | } | |
912 | ||
913 | static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
914 | { | |
915 | struct ip_vs_conn *cp = v; | |
916 | struct list_head *e, *l = seq->private; | |
917 | int idx; | |
918 | ||
919 | ++*pos; | |
e905a9ed | 920 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
921 | return ip_vs_conn_array(seq, 0); |
922 | ||
923 | /* more on same hash chain? */ | |
924 | if ((e = cp->c_list.next) != l) | |
925 | return list_entry(e, struct ip_vs_conn, c_list); | |
926 | ||
927 | idx = l - ip_vs_conn_tab; | |
928 | ct_read_unlock_bh(idx); | |
929 | ||
6f7edb48 | 930 | while (++idx < ip_vs_conn_tab_size) { |
1da177e4 LT |
931 | ct_read_lock_bh(idx); |
932 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
933 | seq->private = &ip_vs_conn_tab[idx]; | |
934 | return cp; | |
e905a9ed | 935 | } |
1da177e4 LT |
936 | ct_read_unlock_bh(idx); |
937 | } | |
938 | seq->private = NULL; | |
939 | return NULL; | |
940 | } | |
941 | ||
942 | static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) | |
943 | { | |
944 | struct list_head *l = seq->private; | |
945 | ||
946 | if (l) | |
947 | ct_read_unlock_bh(l - ip_vs_conn_tab); | |
948 | } | |
949 | ||
950 | static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) | |
951 | { | |
952 | ||
953 | if (v == SEQ_START_TOKEN) | |
954 | seq_puts(seq, | |
a3c918ac | 955 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n"); |
1da177e4 LT |
956 | else { |
957 | const struct ip_vs_conn *cp = v; | |
a3c918ac SH |
958 | char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3]; |
959 | size_t len = 0; | |
960 | ||
f71499aa | 961 | if (cp->dest && cp->pe_data && |
a3c918ac SH |
962 | cp->dest->svc->pe->show_pe_data) { |
963 | pe_data[0] = ' '; | |
964 | len = strlen(cp->dest->svc->pe->name); | |
965 | memcpy(pe_data + 1, cp->dest->svc->pe->name, len); | |
966 | pe_data[len + 1] = ' '; | |
967 | len += 2; | |
968 | len += cp->dest->svc->pe->show_pe_data(cp, | |
969 | pe_data + len); | |
970 | } | |
971 | pe_data[len] = '\0'; | |
1da177e4 | 972 | |
667a5f18 VB |
973 | #ifdef CONFIG_IP_VS_IPV6 |
974 | if (cp->af == AF_INET6) | |
a3c918ac SH |
975 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X " |
976 | "%pI6 %04X %-11s %7lu%s\n", | |
667a5f18 | 977 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
978 | &cp->caddr.in6, ntohs(cp->cport), |
979 | &cp->vaddr.in6, ntohs(cp->vport), | |
980 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 | 981 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 982 | (cp->timer.expires-jiffies)/HZ, pe_data); |
667a5f18 VB |
983 | else |
984 | #endif | |
985 | seq_printf(seq, | |
986 | "%-3s %08X %04X %08X %04X" | |
a3c918ac | 987 | " %08X %04X %-11s %7lu%s\n", |
1da177e4 | 988 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
989 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
990 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
991 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
1da177e4 | 992 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 993 | (cp->timer.expires-jiffies)/HZ, pe_data); |
1da177e4 LT |
994 | } |
995 | return 0; | |
996 | } | |
997 | ||
56b3d975 | 998 | static const struct seq_operations ip_vs_conn_seq_ops = { |
1da177e4 LT |
999 | .start = ip_vs_conn_seq_start, |
1000 | .next = ip_vs_conn_seq_next, | |
1001 | .stop = ip_vs_conn_seq_stop, | |
1002 | .show = ip_vs_conn_seq_show, | |
1003 | }; | |
1004 | ||
1005 | static int ip_vs_conn_open(struct inode *inode, struct file *file) | |
1006 | { | |
1007 | return seq_open(file, &ip_vs_conn_seq_ops); | |
1008 | } | |
1009 | ||
9a32144e | 1010 | static const struct file_operations ip_vs_conn_fops = { |
1da177e4 LT |
1011 | .owner = THIS_MODULE, |
1012 | .open = ip_vs_conn_open, | |
1013 | .read = seq_read, | |
1014 | .llseek = seq_lseek, | |
1015 | .release = seq_release, | |
1016 | }; | |
7a4fbb1f RB |
1017 | |
1018 | static const char *ip_vs_origin_name(unsigned flags) | |
1019 | { | |
1020 | if (flags & IP_VS_CONN_F_SYNC) | |
1021 | return "SYNC"; | |
1022 | else | |
1023 | return "LOCAL"; | |
1024 | } | |
1025 | ||
1026 | static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) | |
1027 | { | |
1028 | ||
1029 | if (v == SEQ_START_TOKEN) | |
1030 | seq_puts(seq, | |
1031 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); | |
1032 | else { | |
1033 | const struct ip_vs_conn *cp = v; | |
1034 | ||
667a5f18 VB |
1035 | #ifdef CONFIG_IP_VS_IPV6 |
1036 | if (cp->af == AF_INET6) | |
5b095d98 | 1037 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n", |
667a5f18 | 1038 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
1039 | &cp->caddr.in6, ntohs(cp->cport), |
1040 | &cp->vaddr.in6, ntohs(cp->vport), | |
1041 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 VB |
1042 | ip_vs_state_name(cp->protocol, cp->state), |
1043 | ip_vs_origin_name(cp->flags), | |
1044 | (cp->timer.expires-jiffies)/HZ); | |
1045 | else | |
1046 | #endif | |
1047 | seq_printf(seq, | |
1048 | "%-3s %08X %04X %08X %04X " | |
1049 | "%08X %04X %-11s %-6s %7lu\n", | |
7a4fbb1f | 1050 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
1051 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
1052 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
1053 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
7a4fbb1f RB |
1054 | ip_vs_state_name(cp->protocol, cp->state), |
1055 | ip_vs_origin_name(cp->flags), | |
1056 | (cp->timer.expires-jiffies)/HZ); | |
1057 | } | |
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static const struct seq_operations ip_vs_conn_sync_seq_ops = { | |
1062 | .start = ip_vs_conn_seq_start, | |
1063 | .next = ip_vs_conn_seq_next, | |
1064 | .stop = ip_vs_conn_seq_stop, | |
1065 | .show = ip_vs_conn_sync_seq_show, | |
1066 | }; | |
1067 | ||
1068 | static int ip_vs_conn_sync_open(struct inode *inode, struct file *file) | |
1069 | { | |
1070 | return seq_open(file, &ip_vs_conn_sync_seq_ops); | |
1071 | } | |
1072 | ||
1073 | static const struct file_operations ip_vs_conn_sync_fops = { | |
1074 | .owner = THIS_MODULE, | |
1075 | .open = ip_vs_conn_sync_open, | |
1076 | .read = seq_read, | |
1077 | .llseek = seq_lseek, | |
1078 | .release = seq_release, | |
1079 | }; | |
1080 | ||
1da177e4 LT |
1081 | #endif |
1082 | ||
1083 | ||
1084 | /* | |
1085 | * Randomly drop connection entries before running out of memory | |
1086 | */ | |
1087 | static inline int todrop_entry(struct ip_vs_conn *cp) | |
1088 | { | |
1089 | /* | |
1090 | * The drop rate array needs tuning for real environments. | |
1091 | * Called from timer bh only => no locking | |
1092 | */ | |
9b5b5cff | 1093 | static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; |
1da177e4 LT |
1094 | static char todrop_counter[9] = {0}; |
1095 | int i; | |
1096 | ||
1097 | /* if the conn entry hasn't lasted for 60 seconds, don't drop it. | |
1098 | This will leave enough time for normal connection to get | |
1099 | through. */ | |
1100 | if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) | |
1101 | return 0; | |
1102 | ||
1103 | /* Don't drop the entry if its number of incoming packets is not | |
1104 | located in [0, 8] */ | |
1105 | i = atomic_read(&cp->in_pkts); | |
1106 | if (i > 8 || i < 0) return 0; | |
1107 | ||
1108 | if (!todrop_rate[i]) return 0; | |
1109 | if (--todrop_counter[i] > 0) return 0; | |
1110 | ||
1111 | todrop_counter[i] = todrop_rate[i]; | |
1112 | return 1; | |
1113 | } | |
1114 | ||
af9debd4 | 1115 | /* Called from keventd and must protect itself from softirqs */ |
1da177e4 LT |
1116 | void ip_vs_random_dropentry(void) |
1117 | { | |
1118 | int idx; | |
1119 | struct ip_vs_conn *cp; | |
1da177e4 LT |
1120 | |
1121 | /* | |
1122 | * Randomly scan 1/32 of the whole table every second | |
1123 | */ | |
6f7edb48 CB |
1124 | for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) { |
1125 | unsigned hash = net_random() & ip_vs_conn_tab_mask; | |
1da177e4 LT |
1126 | |
1127 | /* | |
1128 | * Lock is actually needed in this loop. | |
1129 | */ | |
af9debd4 | 1130 | ct_write_lock_bh(hash); |
1da177e4 LT |
1131 | |
1132 | list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { | |
87375ab4 | 1133 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) |
1da177e4 LT |
1134 | /* connection template */ |
1135 | continue; | |
1136 | ||
1137 | if (cp->protocol == IPPROTO_TCP) { | |
1138 | switch(cp->state) { | |
1139 | case IP_VS_TCP_S_SYN_RECV: | |
1140 | case IP_VS_TCP_S_SYNACK: | |
1141 | break; | |
1142 | ||
1143 | case IP_VS_TCP_S_ESTABLISHED: | |
1144 | if (todrop_entry(cp)) | |
1145 | break; | |
1146 | continue; | |
1147 | ||
1148 | default: | |
1149 | continue; | |
1150 | } | |
1151 | } else { | |
1152 | if (!todrop_entry(cp)) | |
1153 | continue; | |
1154 | } | |
1155 | ||
1da177e4 LT |
1156 | IP_VS_DBG(4, "del connection\n"); |
1157 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1158 | if (cp->control) { |
1da177e4 | 1159 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1160 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1161 | } |
1da177e4 | 1162 | } |
af9debd4 | 1163 | ct_write_unlock_bh(hash); |
1da177e4 LT |
1164 | } |
1165 | } | |
1166 | ||
1167 | ||
1168 | /* | |
1169 | * Flush all the connection entries in the ip_vs_conn_tab | |
1170 | */ | |
1171 | static void ip_vs_conn_flush(void) | |
1172 | { | |
1173 | int idx; | |
1174 | struct ip_vs_conn *cp; | |
1da177e4 LT |
1175 | |
1176 | flush_again: | |
6f7edb48 | 1177 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 LT |
1178 | /* |
1179 | * Lock is actually needed in this loop. | |
1180 | */ | |
1181 | ct_write_lock_bh(idx); | |
1182 | ||
1183 | list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { | |
1da177e4 | 1184 | |
1da177e4 LT |
1185 | IP_VS_DBG(4, "del connection\n"); |
1186 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1187 | if (cp->control) { |
1da177e4 | 1188 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1189 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1190 | } |
1da177e4 LT |
1191 | } |
1192 | ct_write_unlock_bh(idx); | |
1193 | } | |
1194 | ||
1195 | /* the counter may be not NULL, because maybe some conn entries | |
1196 | are run by slow timer handler or unhashed but still referred */ | |
1197 | if (atomic_read(&ip_vs_conn_count) != 0) { | |
1198 | schedule(); | |
1199 | goto flush_again; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | ||
048cf48b | 1204 | int __init ip_vs_conn_init(void) |
1da177e4 LT |
1205 | { |
1206 | int idx; | |
1207 | ||
6f7edb48 CB |
1208 | /* Compute size and mask */ |
1209 | ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits; | |
1210 | ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1; | |
1211 | ||
1da177e4 LT |
1212 | /* |
1213 | * Allocate the connection hash table and initialize its list heads | |
1214 | */ | |
6f7edb48 CB |
1215 | ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * |
1216 | sizeof(struct list_head)); | |
1da177e4 LT |
1217 | if (!ip_vs_conn_tab) |
1218 | return -ENOMEM; | |
1219 | ||
1220 | /* Allocate ip_vs_conn slab cache */ | |
1221 | ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", | |
1222 | sizeof(struct ip_vs_conn), 0, | |
20c2df83 | 1223 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1224 | if (!ip_vs_conn_cachep) { |
1225 | vfree(ip_vs_conn_tab); | |
1226 | return -ENOMEM; | |
1227 | } | |
1228 | ||
1e3e238e HE |
1229 | pr_info("Connection hash table configured " |
1230 | "(size=%d, memory=%ldKbytes)\n", | |
6f7edb48 CB |
1231 | ip_vs_conn_tab_size, |
1232 | (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024); | |
1da177e4 LT |
1233 | IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n", |
1234 | sizeof(struct ip_vs_conn)); | |
1235 | ||
6f7edb48 | 1236 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 LT |
1237 | INIT_LIST_HEAD(&ip_vs_conn_tab[idx]); |
1238 | } | |
1239 | ||
1240 | for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { | |
1241 | rwlock_init(&__ip_vs_conntbl_lock_array[idx].l); | |
1242 | } | |
1243 | ||
457c4cbc | 1244 | proc_net_fops_create(&init_net, "ip_vs_conn", 0, &ip_vs_conn_fops); |
7a4fbb1f | 1245 | proc_net_fops_create(&init_net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops); |
1da177e4 LT |
1246 | |
1247 | /* calculate the random value for connection hash */ | |
1248 | get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); | |
1249 | ||
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | ||
1254 | void ip_vs_conn_cleanup(void) | |
1255 | { | |
1256 | /* flush all the connection entries first */ | |
1257 | ip_vs_conn_flush(); | |
1258 | ||
1259 | /* Release the empty cache */ | |
1260 | kmem_cache_destroy(ip_vs_conn_cachep); | |
457c4cbc | 1261 | proc_net_remove(&init_net, "ip_vs_conn"); |
7a4fbb1f | 1262 | proc_net_remove(&init_net, "ip_vs_conn_sync"); |
1da177e4 LT |
1263 | vfree(ip_vs_conn_tab); |
1264 | } |