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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> |
f18ae720 | 30 | #include <linux/inet.h> |
f190055f | 31 | #include <linux/net.h> |
1da177e4 | 32 | #include <linux/kernel.h> |
14c85021 | 33 | #include <linux/module.h> |
1da177e4 LT |
34 | #include <linux/vmalloc.h> |
35 | #include <linux/proc_fs.h> /* for proc_net_* */ | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 LT |
37 | #include <linux/seq_file.h> |
38 | #include <linux/jhash.h> | |
39 | #include <linux/random.h> | |
40 | ||
457c4cbc | 41 | #include <net/net_namespace.h> |
1da177e4 LT |
42 | #include <net/ip_vs.h> |
43 | ||
44 | ||
6f7edb48 CB |
45 | #ifndef CONFIG_IP_VS_TAB_BITS |
46 | #define CONFIG_IP_VS_TAB_BITS 12 | |
47 | #endif | |
48 | ||
49 | /* | |
50 | * Connection hash size. Default is what was selected at compile time. | |
51 | */ | |
4ecd2944 | 52 | static int ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS; |
6f7edb48 CB |
53 | module_param_named(conn_tab_bits, ip_vs_conn_tab_bits, int, 0444); |
54 | MODULE_PARM_DESC(conn_tab_bits, "Set connections' hash size"); | |
55 | ||
56 | /* size and mask values */ | |
4ecd2944 ED |
57 | int ip_vs_conn_tab_size __read_mostly; |
58 | static int ip_vs_conn_tab_mask __read_mostly; | |
6f7edb48 | 59 | |
1da177e4 LT |
60 | /* |
61 | * Connection hash table: for input and output packets lookups of IPVS | |
62 | */ | |
731109e7 | 63 | static struct hlist_head *ip_vs_conn_tab __read_mostly; |
1da177e4 LT |
64 | |
65 | /* SLAB cache for IPVS connections */ | |
e18b890b | 66 | static struct kmem_cache *ip_vs_conn_cachep __read_mostly; |
1da177e4 | 67 | |
1da177e4 LT |
68 | /* counter for no client port connections */ |
69 | static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0); | |
70 | ||
71 | /* random value for IPVS connection hash */ | |
4ecd2944 | 72 | static unsigned int ip_vs_conn_rnd __read_mostly; |
1da177e4 LT |
73 | |
74 | /* | |
75 | * Fine locking granularity for big connection hash table | |
76 | */ | |
6e67e586 | 77 | #define CT_LOCKARRAY_BITS 5 |
1da177e4 LT |
78 | #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS) |
79 | #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1) | |
80 | ||
f18ae720 JA |
81 | /* We need an addrstrlen that works with or without v6 */ |
82 | #ifdef CONFIG_IP_VS_IPV6 | |
83 | #define IP_VS_ADDRSTRLEN INET6_ADDRSTRLEN | |
84 | #else | |
85 | #define IP_VS_ADDRSTRLEN (8+1) | |
86 | #endif | |
87 | ||
1da177e4 LT |
88 | struct ip_vs_aligned_lock |
89 | { | |
088339a5 | 90 | spinlock_t l; |
1da177e4 LT |
91 | } __attribute__((__aligned__(SMP_CACHE_BYTES))); |
92 | ||
93 | /* lock array for conn table */ | |
94 | static struct ip_vs_aligned_lock | |
95 | __ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned; | |
96 | ||
ac69269a | 97 | static inline void ct_write_lock_bh(unsigned int key) |
1da177e4 | 98 | { |
ac69269a | 99 | spin_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); |
1da177e4 LT |
100 | } |
101 | ||
ac69269a | 102 | static inline void ct_write_unlock_bh(unsigned int key) |
1da177e4 | 103 | { |
ac69269a | 104 | spin_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); |
1da177e4 LT |
105 | } |
106 | ||
107 | ||
108 | /* | |
109 | * Returns hash value for IPVS connection entry | |
110 | */ | |
754b81a3 | 111 | static unsigned int ip_vs_conn_hashkey(struct netns_ipvs *ipvs, int af, unsigned int proto, |
28364a59 JV |
112 | const union nf_inet_addr *addr, |
113 | __be16 port) | |
1da177e4 | 114 | { |
28364a59 JV |
115 | #ifdef CONFIG_IP_VS_IPV6 |
116 | if (af == AF_INET6) | |
6e67e586 HS |
117 | return (jhash_3words(jhash(addr, 16, ip_vs_conn_rnd), |
118 | (__force u32)port, proto, ip_vs_conn_rnd) ^ | |
754b81a3 | 119 | ((size_t)ipvs>>8)) & ip_vs_conn_tab_mask; |
28364a59 | 120 | #endif |
6e67e586 HS |
121 | return (jhash_3words((__force u32)addr->ip, (__force u32)port, proto, |
122 | ip_vs_conn_rnd) ^ | |
754b81a3 | 123 | ((size_t)ipvs>>8)) & ip_vs_conn_tab_mask; |
1da177e4 LT |
124 | } |
125 | ||
85999283 SH |
126 | static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p, |
127 | bool inverse) | |
128 | { | |
129 | const union nf_inet_addr *addr; | |
130 | __be16 port; | |
131 | ||
f71499aa | 132 | if (p->pe_data && p->pe->hashkey_raw) |
85999283 SH |
133 | return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) & |
134 | ip_vs_conn_tab_mask; | |
135 | ||
136 | if (likely(!inverse)) { | |
137 | addr = p->caddr; | |
138 | port = p->cport; | |
139 | } else { | |
140 | addr = p->vaddr; | |
141 | port = p->vport; | |
142 | } | |
143 | ||
754b81a3 | 144 | return ip_vs_conn_hashkey(p->ipvs, p->af, p->protocol, addr, port); |
85999283 SH |
145 | } |
146 | ||
147 | static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp) | |
148 | { | |
149 | struct ip_vs_conn_param p; | |
150 | ||
19913dec | 151 | ip_vs_conn_fill_param(cp->ipvs, cp->af, cp->protocol, |
6e67e586 | 152 | &cp->caddr, cp->cport, NULL, 0, &p); |
85999283 | 153 | |
e9e5eee8 SH |
154 | if (cp->pe) { |
155 | p.pe = cp->pe; | |
85999283 SH |
156 | p.pe_data = cp->pe_data; |
157 | p.pe_data_len = cp->pe_data_len; | |
158 | } | |
159 | ||
160 | return ip_vs_conn_hashkey_param(&p, false); | |
161 | } | |
1da177e4 LT |
162 | |
163 | /* | |
6e67e586 | 164 | * Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port. |
1da177e4 LT |
165 | * returns bool success. |
166 | */ | |
167 | static inline int ip_vs_conn_hash(struct ip_vs_conn *cp) | |
168 | { | |
95c96174 | 169 | unsigned int hash; |
1da177e4 LT |
170 | int ret; |
171 | ||
26ec037f NC |
172 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
173 | return 0; | |
174 | ||
1da177e4 | 175 | /* Hash by protocol, client address and port */ |
85999283 | 176 | hash = ip_vs_conn_hashkey_conn(cp); |
1da177e4 | 177 | |
ac69269a | 178 | ct_write_lock_bh(hash); |
aea9d711 | 179 | spin_lock(&cp->lock); |
1da177e4 LT |
180 | |
181 | if (!(cp->flags & IP_VS_CONN_F_HASHED)) { | |
1da177e4 LT |
182 | cp->flags |= IP_VS_CONN_F_HASHED; |
183 | atomic_inc(&cp->refcnt); | |
088339a5 | 184 | hlist_add_head_rcu(&cp->c_list, &ip_vs_conn_tab[hash]); |
1da177e4 LT |
185 | ret = 1; |
186 | } else { | |
1e3e238e HE |
187 | pr_err("%s(): request for already hashed, called from %pF\n", |
188 | __func__, __builtin_return_address(0)); | |
1da177e4 LT |
189 | ret = 0; |
190 | } | |
191 | ||
aea9d711 | 192 | spin_unlock(&cp->lock); |
ac69269a | 193 | ct_write_unlock_bh(hash); |
1da177e4 LT |
194 | |
195 | return ret; | |
196 | } | |
197 | ||
198 | ||
199 | /* | |
200 | * UNhashes ip_vs_conn from ip_vs_conn_tab. | |
088339a5 | 201 | * returns bool success. Caller should hold conn reference. |
1da177e4 LT |
202 | */ |
203 | static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp) | |
204 | { | |
95c96174 | 205 | unsigned int hash; |
1da177e4 LT |
206 | int ret; |
207 | ||
208 | /* unhash it and decrease its reference counter */ | |
85999283 | 209 | hash = ip_vs_conn_hashkey_conn(cp); |
1da177e4 | 210 | |
ac69269a | 211 | ct_write_lock_bh(hash); |
aea9d711 | 212 | spin_lock(&cp->lock); |
1da177e4 LT |
213 | |
214 | if (cp->flags & IP_VS_CONN_F_HASHED) { | |
088339a5 | 215 | hlist_del_rcu(&cp->c_list); |
1da177e4 LT |
216 | cp->flags &= ~IP_VS_CONN_F_HASHED; |
217 | atomic_dec(&cp->refcnt); | |
218 | ret = 1; | |
219 | } else | |
220 | ret = 0; | |
221 | ||
aea9d711 | 222 | spin_unlock(&cp->lock); |
ac69269a | 223 | ct_write_unlock_bh(hash); |
1da177e4 LT |
224 | |
225 | return ret; | |
226 | } | |
227 | ||
088339a5 JA |
228 | /* Try to unlink ip_vs_conn from ip_vs_conn_tab. |
229 | * returns bool success. | |
230 | */ | |
231 | static inline bool ip_vs_conn_unlink(struct ip_vs_conn *cp) | |
232 | { | |
233 | unsigned int hash; | |
234 | bool ret; | |
235 | ||
236 | hash = ip_vs_conn_hashkey_conn(cp); | |
237 | ||
ac69269a | 238 | ct_write_lock_bh(hash); |
088339a5 JA |
239 | spin_lock(&cp->lock); |
240 | ||
241 | if (cp->flags & IP_VS_CONN_F_HASHED) { | |
242 | ret = false; | |
243 | /* Decrease refcnt and unlink conn only if we are last user */ | |
244 | if (atomic_cmpxchg(&cp->refcnt, 1, 0) == 1) { | |
245 | hlist_del_rcu(&cp->c_list); | |
246 | cp->flags &= ~IP_VS_CONN_F_HASHED; | |
247 | ret = true; | |
248 | } | |
249 | } else | |
250 | ret = atomic_read(&cp->refcnt) ? false : true; | |
251 | ||
252 | spin_unlock(&cp->lock); | |
ac69269a | 253 | ct_write_unlock_bh(hash); |
088339a5 JA |
254 | |
255 | return ret; | |
256 | } | |
257 | ||
1da177e4 LT |
258 | |
259 | /* | |
260 | * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. | |
261 | * Called for pkts coming from OUTside-to-INside. | |
f11017ec SH |
262 | * p->caddr, p->cport: pkt source address (foreign host) |
263 | * p->vaddr, p->vport: pkt dest address (load balancer) | |
1da177e4 | 264 | */ |
f11017ec SH |
265 | static inline struct ip_vs_conn * |
266 | __ip_vs_conn_in_get(const struct ip_vs_conn_param *p) | |
1da177e4 | 267 | { |
95c96174 | 268 | unsigned int hash; |
1da177e4 LT |
269 | struct ip_vs_conn *cp; |
270 | ||
85999283 | 271 | hash = ip_vs_conn_hashkey_param(p, false); |
1da177e4 | 272 | |
088339a5 | 273 | rcu_read_lock(); |
1da177e4 | 274 | |
088339a5 | 275 | hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { |
1845ed0b JA |
276 | if (p->cport == cp->cport && p->vport == cp->vport && |
277 | cp->af == p->af && | |
f11017ec SH |
278 | ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && |
279 | ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) && | |
f11017ec | 280 | ((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) && |
6e67e586 | 281 | p->protocol == cp->protocol && |
e64e2b46 | 282 | cp->ipvs == p->ipvs) { |
088339a5 JA |
283 | if (!__ip_vs_conn_get(cp)) |
284 | continue; | |
1da177e4 | 285 | /* HIT */ |
088339a5 | 286 | rcu_read_unlock(); |
1da177e4 LT |
287 | return cp; |
288 | } | |
289 | } | |
290 | ||
088339a5 | 291 | rcu_read_unlock(); |
1da177e4 LT |
292 | |
293 | return NULL; | |
294 | } | |
295 | ||
f11017ec | 296 | struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p) |
1da177e4 LT |
297 | { |
298 | struct ip_vs_conn *cp; | |
299 | ||
f11017ec SH |
300 | cp = __ip_vs_conn_in_get(p); |
301 | if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) { | |
302 | struct ip_vs_conn_param cport_zero_p = *p; | |
303 | cport_zero_p.cport = 0; | |
304 | cp = __ip_vs_conn_in_get(&cport_zero_p); | |
305 | } | |
1da177e4 | 306 | |
28364a59 | 307 | IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n", |
f11017ec SH |
308 | ip_vs_proto_name(p->protocol), |
309 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
310 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 311 | cp ? "hit" : "not hit"); |
1da177e4 LT |
312 | |
313 | return cp; | |
314 | } | |
315 | ||
f11017ec | 316 | static int |
f5099dd4 EB |
317 | ip_vs_conn_fill_param_proto(struct netns_ipvs *ipvs, |
318 | int af, const struct sk_buff *skb, | |
f11017ec | 319 | const struct ip_vs_iphdr *iph, |
802c41ad | 320 | struct ip_vs_conn_param *p) |
f11017ec SH |
321 | { |
322 | __be16 _ports[2], *pptr; | |
323 | ||
d4383f04 | 324 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
f11017ec SH |
325 | if (pptr == NULL) |
326 | return 1; | |
327 | ||
802c41ad | 328 | if (likely(!ip_vs_iph_inverse(iph))) |
19913dec | 329 | ip_vs_conn_fill_param(ipvs, af, iph->protocol, &iph->saddr, |
6e67e586 | 330 | pptr[0], &iph->daddr, pptr[1], p); |
f11017ec | 331 | else |
19913dec | 332 | ip_vs_conn_fill_param(ipvs, af, iph->protocol, &iph->daddr, |
6e67e586 | 333 | pptr[1], &iph->saddr, pptr[0], p); |
f11017ec SH |
334 | return 0; |
335 | } | |
336 | ||
5c0d2374 | 337 | struct ip_vs_conn * |
ab161976 EB |
338 | ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af, |
339 | const struct sk_buff *skb, | |
802c41ad | 340 | const struct ip_vs_iphdr *iph) |
5c0d2374 | 341 | { |
f11017ec | 342 | struct ip_vs_conn_param p; |
5c0d2374 | 343 | |
f5099dd4 | 344 | if (ip_vs_conn_fill_param_proto(ipvs, af, skb, iph, &p)) |
5c0d2374 SH |
345 | return NULL; |
346 | ||
f11017ec | 347 | return ip_vs_conn_in_get(&p); |
5c0d2374 SH |
348 | } |
349 | EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto); | |
350 | ||
87375ab4 | 351 | /* Get reference to connection template */ |
f11017ec | 352 | struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p) |
87375ab4 | 353 | { |
95c96174 | 354 | unsigned int hash; |
87375ab4 JA |
355 | struct ip_vs_conn *cp; |
356 | ||
85999283 | 357 | hash = ip_vs_conn_hashkey_param(p, false); |
87375ab4 | 358 | |
088339a5 | 359 | rcu_read_lock(); |
87375ab4 | 360 | |
088339a5 | 361 | hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { |
1845ed0b | 362 | if (unlikely(p->pe_data && p->pe->ct_match)) { |
e64e2b46 | 363 | if (cp->ipvs != p->ipvs) |
1845ed0b | 364 | continue; |
088339a5 JA |
365 | if (p->pe == cp->pe && p->pe->ct_match(p, cp)) { |
366 | if (__ip_vs_conn_get(cp)) | |
367 | goto out; | |
368 | } | |
85999283 SH |
369 | continue; |
370 | } | |
371 | ||
f11017ec SH |
372 | if (cp->af == p->af && |
373 | ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && | |
be8be9ec | 374 | /* protocol should only be IPPROTO_IP if |
f11017ec SH |
375 | * p->vaddr is a fwmark */ |
376 | ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC : | |
377 | p->af, p->vaddr, &cp->vaddr) && | |
1845ed0b | 378 | p->vport == cp->vport && p->cport == cp->cport && |
87375ab4 | 379 | cp->flags & IP_VS_CONN_F_TEMPLATE && |
1845ed0b | 380 | p->protocol == cp->protocol && |
e64e2b46 | 381 | cp->ipvs == p->ipvs) { |
088339a5 JA |
382 | if (__ip_vs_conn_get(cp)) |
383 | goto out; | |
384 | } | |
87375ab4 JA |
385 | } |
386 | cp = NULL; | |
387 | ||
388 | out: | |
088339a5 | 389 | rcu_read_unlock(); |
87375ab4 | 390 | |
28364a59 | 391 | IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n", |
f11017ec SH |
392 | ip_vs_proto_name(p->protocol), |
393 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
394 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 395 | cp ? "hit" : "not hit"); |
87375ab4 JA |
396 | |
397 | return cp; | |
398 | } | |
1da177e4 | 399 | |
f11017ec SH |
400 | /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. |
401 | * Called for pkts coming from inside-to-OUTside. | |
402 | * p->caddr, p->cport: pkt source address (inside host) | |
403 | * p->vaddr, p->vport: pkt dest address (foreign host) */ | |
404 | struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p) | |
1da177e4 | 405 | { |
95c96174 | 406 | unsigned int hash; |
1da177e4 LT |
407 | struct ip_vs_conn *cp, *ret=NULL; |
408 | ||
409 | /* | |
410 | * Check for "full" addressed entries | |
411 | */ | |
85999283 | 412 | hash = ip_vs_conn_hashkey_param(p, true); |
1da177e4 | 413 | |
088339a5 | 414 | rcu_read_lock(); |
1da177e4 | 415 | |
088339a5 | 416 | hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { |
1845ed0b JA |
417 | if (p->vport == cp->cport && p->cport == cp->dport && |
418 | cp->af == p->af && | |
f11017ec SH |
419 | ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) && |
420 | ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) && | |
6e67e586 | 421 | p->protocol == cp->protocol && |
e64e2b46 | 422 | cp->ipvs == p->ipvs) { |
088339a5 JA |
423 | if (!__ip_vs_conn_get(cp)) |
424 | continue; | |
1da177e4 | 425 | /* HIT */ |
1da177e4 LT |
426 | ret = cp; |
427 | break; | |
428 | } | |
429 | } | |
430 | ||
088339a5 | 431 | rcu_read_unlock(); |
1da177e4 | 432 | |
28364a59 | 433 | IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n", |
f11017ec SH |
434 | ip_vs_proto_name(p->protocol), |
435 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
436 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 437 | ret ? "hit" : "not hit"); |
1da177e4 LT |
438 | |
439 | return ret; | |
440 | } | |
441 | ||
5c0d2374 | 442 | struct ip_vs_conn * |
0cf705c8 EB |
443 | ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af, |
444 | const struct sk_buff *skb, | |
802c41ad | 445 | const struct ip_vs_iphdr *iph) |
5c0d2374 | 446 | { |
f11017ec | 447 | struct ip_vs_conn_param p; |
5c0d2374 | 448 | |
f5099dd4 | 449 | if (ip_vs_conn_fill_param_proto(ipvs, af, skb, iph, &p)) |
5c0d2374 SH |
450 | return NULL; |
451 | ||
f11017ec | 452 | return ip_vs_conn_out_get(&p); |
5c0d2374 SH |
453 | } |
454 | EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto); | |
1da177e4 LT |
455 | |
456 | /* | |
457 | * Put back the conn and restart its timer with its timeout | |
458 | */ | |
459 | void ip_vs_conn_put(struct ip_vs_conn *cp) | |
460 | { | |
26ec037f NC |
461 | unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ? |
462 | 0 : cp->timeout; | |
463 | mod_timer(&cp->timer, jiffies+t); | |
1da177e4 LT |
464 | |
465 | __ip_vs_conn_put(cp); | |
466 | } | |
467 | ||
468 | ||
469 | /* | |
470 | * Fill a no_client_port connection with a client port number | |
471 | */ | |
014d730d | 472 | void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) |
1da177e4 LT |
473 | { |
474 | if (ip_vs_conn_unhash(cp)) { | |
ac69269a | 475 | spin_lock_bh(&cp->lock); |
1da177e4 LT |
476 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) { |
477 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
478 | cp->flags &= ~IP_VS_CONN_F_NO_CPORT; | |
479 | cp->cport = cport; | |
480 | } | |
ac69269a | 481 | spin_unlock_bh(&cp->lock); |
1da177e4 LT |
482 | |
483 | /* hash on new dport */ | |
484 | ip_vs_conn_hash(cp); | |
485 | } | |
486 | } | |
487 | ||
488 | ||
489 | /* | |
490 | * Bind a connection entry with the corresponding packet_xmit. | |
491 | * Called by ip_vs_conn_new. | |
492 | */ | |
493 | static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) | |
494 | { | |
495 | switch (IP_VS_FWD_METHOD(cp)) { | |
496 | case IP_VS_CONN_F_MASQ: | |
497 | cp->packet_xmit = ip_vs_nat_xmit; | |
498 | break; | |
499 | ||
500 | case IP_VS_CONN_F_TUNNEL: | |
8052ba29 AG |
501 | #ifdef CONFIG_IP_VS_IPV6 |
502 | if (cp->daf == AF_INET6) | |
503 | cp->packet_xmit = ip_vs_tunnel_xmit_v6; | |
504 | else | |
505 | #endif | |
506 | cp->packet_xmit = ip_vs_tunnel_xmit; | |
1da177e4 LT |
507 | break; |
508 | ||
509 | case IP_VS_CONN_F_DROUTE: | |
510 | cp->packet_xmit = ip_vs_dr_xmit; | |
511 | break; | |
512 | ||
513 | case IP_VS_CONN_F_LOCALNODE: | |
514 | cp->packet_xmit = ip_vs_null_xmit; | |
515 | break; | |
516 | ||
517 | case IP_VS_CONN_F_BYPASS: | |
518 | cp->packet_xmit = ip_vs_bypass_xmit; | |
519 | break; | |
520 | } | |
521 | } | |
522 | ||
b3cdd2a7 JV |
523 | #ifdef CONFIG_IP_VS_IPV6 |
524 | static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp) | |
525 | { | |
526 | switch (IP_VS_FWD_METHOD(cp)) { | |
527 | case IP_VS_CONN_F_MASQ: | |
528 | cp->packet_xmit = ip_vs_nat_xmit_v6; | |
529 | break; | |
530 | ||
531 | case IP_VS_CONN_F_TUNNEL: | |
8052ba29 AG |
532 | if (cp->daf == AF_INET6) |
533 | cp->packet_xmit = ip_vs_tunnel_xmit_v6; | |
534 | else | |
535 | cp->packet_xmit = ip_vs_tunnel_xmit; | |
b3cdd2a7 JV |
536 | break; |
537 | ||
538 | case IP_VS_CONN_F_DROUTE: | |
539 | cp->packet_xmit = ip_vs_dr_xmit_v6; | |
540 | break; | |
541 | ||
542 | case IP_VS_CONN_F_LOCALNODE: | |
543 | cp->packet_xmit = ip_vs_null_xmit; | |
544 | break; | |
545 | ||
546 | case IP_VS_CONN_F_BYPASS: | |
547 | cp->packet_xmit = ip_vs_bypass_xmit_v6; | |
548 | break; | |
549 | } | |
550 | } | |
551 | #endif | |
552 | ||
1da177e4 LT |
553 | |
554 | static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) | |
555 | { | |
556 | return atomic_read(&dest->activeconns) | |
557 | + atomic_read(&dest->inactconns); | |
558 | } | |
559 | ||
560 | /* | |
561 | * Bind a connection entry with a virtual service destination | |
562 | * Called just after a new connection entry is created. | |
563 | */ | |
564 | static inline void | |
565 | ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) | |
566 | { | |
3575792e | 567 | unsigned int conn_flags; |
6b324dbf | 568 | __u32 flags; |
3575792e | 569 | |
1da177e4 LT |
570 | /* if dest is NULL, then return directly */ |
571 | if (!dest) | |
572 | return; | |
573 | ||
574 | /* Increase the refcnt counter of the dest */ | |
fca9c20a | 575 | ip_vs_dest_hold(dest); |
1da177e4 | 576 | |
3575792e JA |
577 | conn_flags = atomic_read(&dest->conn_flags); |
578 | if (cp->protocol != IPPROTO_UDP) | |
579 | conn_flags &= ~IP_VS_CONN_F_ONE_PACKET; | |
6b324dbf | 580 | flags = cp->flags; |
1da177e4 | 581 | /* Bind with the destination and its corresponding transmitter */ |
6b324dbf | 582 | if (flags & IP_VS_CONN_F_SYNC) { |
b209639e RB |
583 | /* if the connection is not template and is created |
584 | * by sync, preserve the activity flag. | |
585 | */ | |
6b324dbf | 586 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) |
3575792e | 587 | conn_flags &= ~IP_VS_CONN_F_INACTIVE; |
3233759b | 588 | /* connections inherit forwarding method from dest */ |
6b324dbf | 589 | flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT); |
3575792e | 590 | } |
6b324dbf PNA |
591 | flags |= conn_flags; |
592 | cp->flags = flags; | |
1da177e4 LT |
593 | cp->dest = dest; |
594 | ||
cfc78c5a JV |
595 | IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d " |
596 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
597 | "dest->refcnt:%d\n", | |
598 | ip_vs_proto_name(cp->protocol), | |
599 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
600 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
f18ae720 | 601 | IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport), |
cfc78c5a JV |
602 | ip_vs_fwd_tag(cp), cp->state, |
603 | cp->flags, atomic_read(&cp->refcnt), | |
604 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
605 | |
606 | /* Update the connection counters */ | |
6b324dbf | 607 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) { |
06611f82 JA |
608 | /* It is a normal connection, so modify the counters |
609 | * according to the flags, later the protocol can | |
610 | * update them on state change | |
611 | */ | |
6b324dbf | 612 | if (!(flags & IP_VS_CONN_F_INACTIVE)) |
b209639e RB |
613 | atomic_inc(&dest->activeconns); |
614 | else | |
615 | atomic_inc(&dest->inactconns); | |
1da177e4 LT |
616 | } else { |
617 | /* It is a persistent connection/template, so increase | |
25985edc | 618 | the persistent connection counter */ |
1da177e4 LT |
619 | atomic_inc(&dest->persistconns); |
620 | } | |
621 | ||
622 | if (dest->u_threshold != 0 && | |
623 | ip_vs_dest_totalconns(dest) >= dest->u_threshold) | |
624 | dest->flags |= IP_VS_DEST_F_OVERLOAD; | |
625 | } | |
626 | ||
627 | ||
1e356f9c RB |
628 | /* |
629 | * Check if there is a destination for the connection, if so | |
630 | * bind the connection to the destination. | |
631 | */ | |
413c2d04 | 632 | void ip_vs_try_bind_dest(struct ip_vs_conn *cp) |
1e356f9c RB |
633 | { |
634 | struct ip_vs_dest *dest; | |
635 | ||
413c2d04 | 636 | rcu_read_lock(); |
655eef10 AG |
637 | |
638 | /* This function is only invoked by the synchronization code. We do | |
639 | * not currently support heterogeneous pools with synchronization, | |
640 | * so we can make the assumption that the svc_af is the same as the | |
641 | * dest_af | |
642 | */ | |
dc2add6f | 643 | dest = ip_vs_find_dest(cp->ipvs, cp->af, cp->af, &cp->daddr, |
882a844b JA |
644 | cp->dport, &cp->vaddr, cp->vport, |
645 | cp->protocol, cp->fwmark, cp->flags); | |
646 | if (dest) { | |
647 | struct ip_vs_proto_data *pd; | |
648 | ||
ac69269a | 649 | spin_lock_bh(&cp->lock); |
f73181c8 | 650 | if (cp->dest) { |
ac69269a | 651 | spin_unlock_bh(&cp->lock); |
413c2d04 JA |
652 | rcu_read_unlock(); |
653 | return; | |
f73181c8 PNA |
654 | } |
655 | ||
882a844b JA |
656 | /* Applications work depending on the forwarding method |
657 | * but better to reassign them always when binding dest */ | |
658 | if (cp->app) | |
659 | ip_vs_unbind_app(cp); | |
660 | ||
1e356f9c | 661 | ip_vs_bind_dest(cp, dest); |
ac69269a | 662 | spin_unlock_bh(&cp->lock); |
882a844b JA |
663 | |
664 | /* Update its packet transmitter */ | |
665 | cp->packet_xmit = NULL; | |
666 | #ifdef CONFIG_IP_VS_IPV6 | |
667 | if (cp->af == AF_INET6) | |
668 | ip_vs_bind_xmit_v6(cp); | |
669 | else | |
670 | #endif | |
671 | ip_vs_bind_xmit(cp); | |
672 | ||
18d6ade6 | 673 | pd = ip_vs_proto_data_get(cp->ipvs, cp->protocol); |
882a844b JA |
674 | if (pd && atomic_read(&pd->appcnt)) |
675 | ip_vs_bind_app(cp, pd->pp); | |
676 | } | |
413c2d04 | 677 | rcu_read_unlock(); |
1e356f9c | 678 | } |
1e356f9c RB |
679 | |
680 | ||
1da177e4 LT |
681 | /* |
682 | * Unbind a connection entry with its VS destination | |
683 | * Called by the ip_vs_conn_expire function. | |
684 | */ | |
685 | static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) | |
686 | { | |
687 | struct ip_vs_dest *dest = cp->dest; | |
688 | ||
689 | if (!dest) | |
690 | return; | |
691 | ||
cfc78c5a JV |
692 | IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d " |
693 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
694 | "dest->refcnt:%d\n", | |
695 | ip_vs_proto_name(cp->protocol), | |
696 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
697 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
f18ae720 | 698 | IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport), |
cfc78c5a JV |
699 | ip_vs_fwd_tag(cp), cp->state, |
700 | cp->flags, atomic_read(&cp->refcnt), | |
701 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
702 | |
703 | /* Update the connection counters */ | |
87375ab4 | 704 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
705 | /* It is a normal connection, so decrease the inactconns |
706 | or activeconns counter */ | |
707 | if (cp->flags & IP_VS_CONN_F_INACTIVE) { | |
708 | atomic_dec(&dest->inactconns); | |
709 | } else { | |
710 | atomic_dec(&dest->activeconns); | |
711 | } | |
712 | } else { | |
713 | /* It is a persistent connection/template, so decrease | |
25985edc | 714 | the persistent connection counter */ |
1da177e4 LT |
715 | atomic_dec(&dest->persistconns); |
716 | } | |
717 | ||
718 | if (dest->l_threshold != 0) { | |
719 | if (ip_vs_dest_totalconns(dest) < dest->l_threshold) | |
720 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
721 | } else if (dest->u_threshold != 0) { | |
722 | if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) | |
723 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
724 | } else { | |
725 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
726 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
727 | } | |
728 | ||
fca9c20a | 729 | ip_vs_dest_put(dest); |
1da177e4 LT |
730 | } |
731 | ||
8e1b0b1b SH |
732 | static int expire_quiescent_template(struct netns_ipvs *ipvs, |
733 | struct ip_vs_dest *dest) | |
734 | { | |
735 | #ifdef CONFIG_SYSCTL | |
736 | return ipvs->sysctl_expire_quiescent_template && | |
737 | (atomic_read(&dest->weight) == 0); | |
738 | #else | |
739 | return 0; | |
740 | #endif | |
741 | } | |
1da177e4 LT |
742 | |
743 | /* | |
744 | * Checking if the destination of a connection template is available. | |
745 | * If available, return 1, otherwise invalidate this connection | |
746 | * template and return 0. | |
747 | */ | |
748 | int ip_vs_check_template(struct ip_vs_conn *ct) | |
749 | { | |
750 | struct ip_vs_dest *dest = ct->dest; | |
58dbc6f2 | 751 | struct netns_ipvs *ipvs = ct->ipvs; |
1da177e4 LT |
752 | |
753 | /* | |
754 | * Checking the dest server status. | |
755 | */ | |
756 | if ((dest == NULL) || | |
e905a9ed | 757 | !(dest->flags & IP_VS_DEST_F_AVAILABLE) || |
8e1b0b1b | 758 | expire_quiescent_template(ipvs, dest)) { |
cfc78c5a JV |
759 | IP_VS_DBG_BUF(9, "check_template: dest not available for " |
760 | "protocol %s s:%s:%d v:%s:%d " | |
761 | "-> d:%s:%d\n", | |
762 | ip_vs_proto_name(ct->protocol), | |
763 | IP_VS_DBG_ADDR(ct->af, &ct->caddr), | |
764 | ntohs(ct->cport), | |
765 | IP_VS_DBG_ADDR(ct->af, &ct->vaddr), | |
766 | ntohs(ct->vport), | |
f18ae720 | 767 | IP_VS_DBG_ADDR(ct->daf, &ct->daddr), |
cfc78c5a | 768 | ntohs(ct->dport)); |
1da177e4 LT |
769 | |
770 | /* | |
771 | * Invalidate the connection template | |
772 | */ | |
014d730d | 773 | if (ct->vport != htons(0xffff)) { |
1da177e4 | 774 | if (ip_vs_conn_unhash(ct)) { |
014d730d AV |
775 | ct->dport = htons(0xffff); |
776 | ct->vport = htons(0xffff); | |
1da177e4 LT |
777 | ct->cport = 0; |
778 | ip_vs_conn_hash(ct); | |
779 | } | |
780 | } | |
781 | ||
782 | /* | |
783 | * Simply decrease the refcnt of the template, | |
784 | * don't restart its timer. | |
785 | */ | |
088339a5 | 786 | __ip_vs_conn_put(ct); |
1da177e4 LT |
787 | return 0; |
788 | } | |
789 | return 1; | |
790 | } | |
791 | ||
088339a5 JA |
792 | static void ip_vs_conn_rcu_free(struct rcu_head *head) |
793 | { | |
794 | struct ip_vs_conn *cp = container_of(head, struct ip_vs_conn, | |
795 | rcu_head); | |
796 | ||
797 | ip_vs_pe_put(cp->pe); | |
798 | kfree(cp->pe_data); | |
799 | kmem_cache_free(ip_vs_conn_cachep, cp); | |
800 | } | |
801 | ||
1da177e4 LT |
802 | static void ip_vs_conn_expire(unsigned long data) |
803 | { | |
804 | struct ip_vs_conn *cp = (struct ip_vs_conn *)data; | |
58dbc6f2 | 805 | struct netns_ipvs *ipvs = cp->ipvs; |
1da177e4 | 806 | |
1da177e4 LT |
807 | /* |
808 | * do I control anybody? | |
809 | */ | |
810 | if (atomic_read(&cp->n_control)) | |
811 | goto expire_later; | |
812 | ||
088339a5 JA |
813 | /* Unlink conn if not referenced anymore */ |
814 | if (likely(ip_vs_conn_unlink(cp))) { | |
1da177e4 | 815 | /* delete the timer if it is activated by other users */ |
25cc4ae9 | 816 | del_timer(&cp->timer); |
1da177e4 LT |
817 | |
818 | /* does anybody control me? */ | |
819 | if (cp->control) | |
820 | ip_vs_control_del(cp); | |
821 | ||
8f4e0a18 | 822 | if (cp->flags & IP_VS_CONN_F_NFCT) { |
8f4e0a18 HS |
823 | /* Do not access conntracks during subsys cleanup |
824 | * because nf_conntrack_find_get can not be used after | |
825 | * conntrack cleanup for the net. | |
826 | */ | |
827 | smp_rmb(); | |
828 | if (ipvs->enable) | |
829 | ip_vs_conn_drop_conntrack(cp); | |
830 | } | |
f4bc17cd | 831 | |
1da177e4 LT |
832 | if (unlikely(cp->app != NULL)) |
833 | ip_vs_unbind_app(cp); | |
834 | ip_vs_unbind_dest(cp); | |
835 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) | |
836 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
088339a5 | 837 | call_rcu(&cp->rcu_head, ip_vs_conn_rcu_free); |
6e67e586 | 838 | atomic_dec(&ipvs->conn_count); |
1da177e4 LT |
839 | return; |
840 | } | |
841 | ||
1da177e4 | 842 | expire_later: |
088339a5 JA |
843 | IP_VS_DBG(7, "delayed: conn->refcnt=%d conn->n_control=%d\n", |
844 | atomic_read(&cp->refcnt), | |
1da177e4 LT |
845 | atomic_read(&cp->n_control)); |
846 | ||
088339a5 JA |
847 | atomic_inc(&cp->refcnt); |
848 | cp->timeout = 60*HZ; | |
849 | ||
749c42b6 | 850 | if (ipvs->sync_state & IP_VS_STATE_MASTER) |
b61a8c1a | 851 | ip_vs_sync_conn(ipvs, cp, sysctl_sync_threshold(ipvs)); |
749c42b6 | 852 | |
1da177e4 LT |
853 | ip_vs_conn_put(cp); |
854 | } | |
855 | ||
088339a5 JA |
856 | /* Modify timer, so that it expires as soon as possible. |
857 | * Can be called without reference only if under RCU lock. | |
858 | */ | |
1da177e4 LT |
859 | void ip_vs_conn_expire_now(struct ip_vs_conn *cp) |
860 | { | |
088339a5 JA |
861 | /* Using mod_timer_pending will ensure the timer is not |
862 | * modified after the final del_timer in ip_vs_conn_expire. | |
863 | */ | |
864 | if (timer_pending(&cp->timer) && | |
865 | time_after(cp->timer.expires, jiffies)) | |
866 | mod_timer_pending(&cp->timer, jiffies); | |
1da177e4 LT |
867 | } |
868 | ||
869 | ||
870 | /* | |
871 | * Create a new connection entry and hash it into the ip_vs_conn_tab | |
872 | */ | |
873 | struct ip_vs_conn * | |
ba38528a | 874 | ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af, |
95c96174 | 875 | const union nf_inet_addr *daddr, __be16 dport, unsigned int flags, |
0e051e68 | 876 | struct ip_vs_dest *dest, __u32 fwmark) |
1da177e4 LT |
877 | { |
878 | struct ip_vs_conn *cp; | |
e64e2b46 | 879 | struct netns_ipvs *ipvs = p->ipvs; |
18d6ade6 | 880 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->ipvs, |
6e67e586 | 881 | p->protocol); |
1da177e4 | 882 | |
9a05475c | 883 | cp = kmem_cache_alloc(ip_vs_conn_cachep, GFP_ATOMIC); |
1da177e4 | 884 | if (cp == NULL) { |
1e3e238e | 885 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
886 | return NULL; |
887 | } | |
888 | ||
731109e7 | 889 | INIT_HLIST_NODE(&cp->c_list); |
b24b8a24 | 890 | setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp); |
58dbc6f2 | 891 | cp->ipvs = ipvs; |
f11017ec | 892 | cp->af = p->af; |
ba38528a | 893 | cp->daf = dest_af; |
f11017ec | 894 | cp->protocol = p->protocol; |
9a05475c | 895 | ip_vs_addr_set(p->af, &cp->caddr, p->caddr); |
f11017ec | 896 | cp->cport = p->cport; |
2a971354 | 897 | /* proto should only be IPPROTO_IP if p->vaddr is a fwmark */ |
9a05475c | 898 | ip_vs_addr_set(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af, |
2a971354 MK |
899 | &cp->vaddr, p->vaddr); |
900 | cp->vport = p->vport; | |
ba38528a | 901 | ip_vs_addr_set(cp->daf, &cp->daddr, daddr); |
1da177e4 LT |
902 | cp->dport = dport; |
903 | cp->flags = flags; | |
0e051e68 | 904 | cp->fwmark = fwmark; |
e9e5eee8 SH |
905 | if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) { |
906 | ip_vs_pe_get(p->pe); | |
907 | cp->pe = p->pe; | |
85999283 SH |
908 | cp->pe_data = p->pe_data; |
909 | cp->pe_data_len = p->pe_data_len; | |
9a05475c JA |
910 | } else { |
911 | cp->pe = NULL; | |
912 | cp->pe_data = NULL; | |
913 | cp->pe_data_len = 0; | |
85999283 | 914 | } |
1da177e4 LT |
915 | spin_lock_init(&cp->lock); |
916 | ||
917 | /* | |
918 | * Set the entry is referenced by the current thread before hashing | |
919 | * it in the table, so that other thread run ip_vs_random_dropentry | |
920 | * but cannot drop this entry. | |
921 | */ | |
922 | atomic_set(&cp->refcnt, 1); | |
923 | ||
9a05475c | 924 | cp->control = NULL; |
1da177e4 LT |
925 | atomic_set(&cp->n_control, 0); |
926 | atomic_set(&cp->in_pkts, 0); | |
927 | ||
9a05475c JA |
928 | cp->packet_xmit = NULL; |
929 | cp->app = NULL; | |
930 | cp->app_data = NULL; | |
931 | /* reset struct ip_vs_seq */ | |
932 | cp->in_seq.delta = 0; | |
933 | cp->out_seq.delta = 0; | |
934 | ||
6e67e586 | 935 | atomic_inc(&ipvs->conn_count); |
1da177e4 LT |
936 | if (flags & IP_VS_CONN_F_NO_CPORT) |
937 | atomic_inc(&ip_vs_conn_no_cport_cnt); | |
938 | ||
939 | /* Bind the connection with a destination server */ | |
9a05475c | 940 | cp->dest = NULL; |
1da177e4 LT |
941 | ip_vs_bind_dest(cp, dest); |
942 | ||
943 | /* Set its state and timeout */ | |
944 | cp->state = 0; | |
9a05475c | 945 | cp->old_state = 0; |
1da177e4 | 946 | cp->timeout = 3*HZ; |
749c42b6 | 947 | cp->sync_endtime = jiffies & ~3UL; |
1da177e4 LT |
948 | |
949 | /* Bind its packet transmitter */ | |
b3cdd2a7 | 950 | #ifdef CONFIG_IP_VS_IPV6 |
f11017ec | 951 | if (p->af == AF_INET6) |
b3cdd2a7 JV |
952 | ip_vs_bind_xmit_v6(cp); |
953 | else | |
954 | #endif | |
955 | ip_vs_bind_xmit(cp); | |
1da177e4 | 956 | |
9bbac6a9 HS |
957 | if (unlikely(pd && atomic_read(&pd->appcnt))) |
958 | ip_vs_bind_app(cp, pd->pp); | |
1da177e4 | 959 | |
f4bc17cd JA |
960 | /* |
961 | * Allow conntrack to be preserved. By default, conntrack | |
962 | * is created and destroyed for every packet. | |
963 | * Sometimes keeping conntrack can be useful for | |
964 | * IP_VS_CONN_F_ONE_PACKET too. | |
965 | */ | |
966 | ||
a0840e2e | 967 | if (ip_vs_conntrack_enabled(ipvs)) |
f4bc17cd JA |
968 | cp->flags |= IP_VS_CONN_F_NFCT; |
969 | ||
1da177e4 LT |
970 | /* Hash it in the ip_vs_conn_tab finally */ |
971 | ip_vs_conn_hash(cp); | |
972 | ||
973 | return cp; | |
974 | } | |
975 | ||
1da177e4 LT |
976 | /* |
977 | * /proc/net/ip_vs_conn entries | |
978 | */ | |
979 | #ifdef CONFIG_PROC_FS | |
6e67e586 | 980 | struct ip_vs_iter_state { |
731109e7 CG |
981 | struct seq_net_private p; |
982 | struct hlist_head *l; | |
6e67e586 | 983 | }; |
1da177e4 LT |
984 | |
985 | static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) | |
986 | { | |
987 | int idx; | |
988 | struct ip_vs_conn *cp; | |
6e67e586 | 989 | struct ip_vs_iter_state *iter = seq->private; |
e905a9ed | 990 | |
6f7edb48 | 991 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
088339a5 JA |
992 | hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) { |
993 | /* __ip_vs_conn_get() is not needed by | |
994 | * ip_vs_conn_seq_show and ip_vs_conn_sync_seq_show | |
995 | */ | |
1da177e4 | 996 | if (pos-- == 0) { |
6e67e586 | 997 | iter->l = &ip_vs_conn_tab[idx]; |
731109e7 | 998 | return cp; |
1da177e4 LT |
999 | } |
1000 | } | |
a38e5e23 | 1001 | cond_resched_rcu(); |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | return NULL; | |
1005 | } | |
1006 | ||
1007 | static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) | |
7cf2eb7b | 1008 | __acquires(RCU) |
1da177e4 | 1009 | { |
6e67e586 HS |
1010 | struct ip_vs_iter_state *iter = seq->private; |
1011 | ||
1012 | iter->l = NULL; | |
7cf2eb7b | 1013 | rcu_read_lock(); |
1da177e4 LT |
1014 | return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; |
1015 | } | |
1016 | ||
1017 | static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1018 | { | |
1019 | struct ip_vs_conn *cp = v; | |
6e67e586 | 1020 | struct ip_vs_iter_state *iter = seq->private; |
088339a5 | 1021 | struct hlist_node *e; |
731109e7 | 1022 | struct hlist_head *l = iter->l; |
1da177e4 LT |
1023 | int idx; |
1024 | ||
1025 | ++*pos; | |
e905a9ed | 1026 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
1027 | return ip_vs_conn_array(seq, 0); |
1028 | ||
1029 | /* more on same hash chain? */ | |
088339a5 JA |
1030 | e = rcu_dereference(hlist_next_rcu(&cp->c_list)); |
1031 | if (e) | |
1032 | return hlist_entry(e, struct ip_vs_conn, c_list); | |
1da177e4 LT |
1033 | |
1034 | idx = l - ip_vs_conn_tab; | |
6f7edb48 | 1035 | while (++idx < ip_vs_conn_tab_size) { |
088339a5 | 1036 | hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) { |
6e67e586 | 1037 | iter->l = &ip_vs_conn_tab[idx]; |
1da177e4 | 1038 | return cp; |
e905a9ed | 1039 | } |
a38e5e23 | 1040 | cond_resched_rcu(); |
1da177e4 | 1041 | } |
6e67e586 | 1042 | iter->l = NULL; |
1da177e4 LT |
1043 | return NULL; |
1044 | } | |
1045 | ||
1046 | static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) | |
7cf2eb7b | 1047 | __releases(RCU) |
1da177e4 | 1048 | { |
7cf2eb7b | 1049 | rcu_read_unlock(); |
1da177e4 LT |
1050 | } |
1051 | ||
1052 | static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) | |
1053 | { | |
1054 | ||
1055 | if (v == SEQ_START_TOKEN) | |
1056 | seq_puts(seq, | |
a3c918ac | 1057 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n"); |
1da177e4 LT |
1058 | else { |
1059 | const struct ip_vs_conn *cp = v; | |
6e67e586 | 1060 | struct net *net = seq_file_net(seq); |
a3c918ac SH |
1061 | char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3]; |
1062 | size_t len = 0; | |
f18ae720 | 1063 | char dbuf[IP_VS_ADDRSTRLEN]; |
a3c918ac | 1064 | |
58dbc6f2 | 1065 | if (!net_eq(cp->ipvs->net, net)) |
6e67e586 | 1066 | return 0; |
e9e5eee8 | 1067 | if (cp->pe_data) { |
a3c918ac | 1068 | pe_data[0] = ' '; |
e9e5eee8 SH |
1069 | len = strlen(cp->pe->name); |
1070 | memcpy(pe_data + 1, cp->pe->name, len); | |
a3c918ac SH |
1071 | pe_data[len + 1] = ' '; |
1072 | len += 2; | |
e9e5eee8 | 1073 | len += cp->pe->show_pe_data(cp, pe_data + len); |
a3c918ac SH |
1074 | } |
1075 | pe_data[len] = '\0'; | |
1da177e4 | 1076 | |
f18ae720 JA |
1077 | #ifdef CONFIG_IP_VS_IPV6 |
1078 | if (cp->daf == AF_INET6) | |
1079 | snprintf(dbuf, sizeof(dbuf), "%pI6", &cp->daddr.in6); | |
1080 | else | |
1081 | #endif | |
1082 | snprintf(dbuf, sizeof(dbuf), "%08X", | |
1083 | ntohl(cp->daddr.ip)); | |
1084 | ||
667a5f18 VB |
1085 | #ifdef CONFIG_IP_VS_IPV6 |
1086 | if (cp->af == AF_INET6) | |
a3c918ac | 1087 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X " |
f18ae720 | 1088 | "%s %04X %-11s %7lu%s\n", |
667a5f18 | 1089 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
1090 | &cp->caddr.in6, ntohs(cp->cport), |
1091 | &cp->vaddr.in6, ntohs(cp->vport), | |
f18ae720 | 1092 | dbuf, ntohs(cp->dport), |
667a5f18 | 1093 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 1094 | (cp->timer.expires-jiffies)/HZ, pe_data); |
667a5f18 VB |
1095 | else |
1096 | #endif | |
1097 | seq_printf(seq, | |
1098 | "%-3s %08X %04X %08X %04X" | |
f18ae720 | 1099 | " %s %04X %-11s %7lu%s\n", |
1da177e4 | 1100 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
1101 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
1102 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
f18ae720 | 1103 | dbuf, ntohs(cp->dport), |
1da177e4 | 1104 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 1105 | (cp->timer.expires-jiffies)/HZ, pe_data); |
1da177e4 LT |
1106 | } |
1107 | return 0; | |
1108 | } | |
1109 | ||
56b3d975 | 1110 | static const struct seq_operations ip_vs_conn_seq_ops = { |
1da177e4 LT |
1111 | .start = ip_vs_conn_seq_start, |
1112 | .next = ip_vs_conn_seq_next, | |
1113 | .stop = ip_vs_conn_seq_stop, | |
1114 | .show = ip_vs_conn_seq_show, | |
1115 | }; | |
1116 | ||
1117 | static int ip_vs_conn_open(struct inode *inode, struct file *file) | |
1118 | { | |
6e67e586 HS |
1119 | return seq_open_net(inode, file, &ip_vs_conn_seq_ops, |
1120 | sizeof(struct ip_vs_iter_state)); | |
1da177e4 LT |
1121 | } |
1122 | ||
9a32144e | 1123 | static const struct file_operations ip_vs_conn_fops = { |
1da177e4 LT |
1124 | .owner = THIS_MODULE, |
1125 | .open = ip_vs_conn_open, | |
1126 | .read = seq_read, | |
1127 | .llseek = seq_lseek, | |
0f08190f | 1128 | .release = seq_release_net, |
1da177e4 | 1129 | }; |
7a4fbb1f | 1130 | |
95c96174 | 1131 | static const char *ip_vs_origin_name(unsigned int flags) |
7a4fbb1f RB |
1132 | { |
1133 | if (flags & IP_VS_CONN_F_SYNC) | |
1134 | return "SYNC"; | |
1135 | else | |
1136 | return "LOCAL"; | |
1137 | } | |
1138 | ||
1139 | static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) | |
1140 | { | |
f18ae720 | 1141 | char dbuf[IP_VS_ADDRSTRLEN]; |
7a4fbb1f RB |
1142 | |
1143 | if (v == SEQ_START_TOKEN) | |
1144 | seq_puts(seq, | |
1145 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); | |
1146 | else { | |
1147 | const struct ip_vs_conn *cp = v; | |
6e67e586 HS |
1148 | struct net *net = seq_file_net(seq); |
1149 | ||
58dbc6f2 | 1150 | if (!net_eq(cp->ipvs->net, net)) |
6e67e586 | 1151 | return 0; |
7a4fbb1f | 1152 | |
f18ae720 JA |
1153 | #ifdef CONFIG_IP_VS_IPV6 |
1154 | if (cp->daf == AF_INET6) | |
1155 | snprintf(dbuf, sizeof(dbuf), "%pI6", &cp->daddr.in6); | |
1156 | else | |
1157 | #endif | |
1158 | snprintf(dbuf, sizeof(dbuf), "%08X", | |
1159 | ntohl(cp->daddr.ip)); | |
1160 | ||
667a5f18 VB |
1161 | #ifdef CONFIG_IP_VS_IPV6 |
1162 | if (cp->af == AF_INET6) | |
f18ae720 JA |
1163 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X " |
1164 | "%s %04X %-11s %-6s %7lu\n", | |
667a5f18 | 1165 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
1166 | &cp->caddr.in6, ntohs(cp->cport), |
1167 | &cp->vaddr.in6, ntohs(cp->vport), | |
f18ae720 | 1168 | dbuf, ntohs(cp->dport), |
667a5f18 VB |
1169 | ip_vs_state_name(cp->protocol, cp->state), |
1170 | ip_vs_origin_name(cp->flags), | |
1171 | (cp->timer.expires-jiffies)/HZ); | |
1172 | else | |
1173 | #endif | |
1174 | seq_printf(seq, | |
1175 | "%-3s %08X %04X %08X %04X " | |
f18ae720 | 1176 | "%s %04X %-11s %-6s %7lu\n", |
7a4fbb1f | 1177 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
1178 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
1179 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
f18ae720 | 1180 | dbuf, ntohs(cp->dport), |
7a4fbb1f RB |
1181 | ip_vs_state_name(cp->protocol, cp->state), |
1182 | ip_vs_origin_name(cp->flags), | |
1183 | (cp->timer.expires-jiffies)/HZ); | |
1184 | } | |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | static const struct seq_operations ip_vs_conn_sync_seq_ops = { | |
1189 | .start = ip_vs_conn_seq_start, | |
1190 | .next = ip_vs_conn_seq_next, | |
1191 | .stop = ip_vs_conn_seq_stop, | |
1192 | .show = ip_vs_conn_sync_seq_show, | |
1193 | }; | |
1194 | ||
1195 | static int ip_vs_conn_sync_open(struct inode *inode, struct file *file) | |
1196 | { | |
6e67e586 HS |
1197 | return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops, |
1198 | sizeof(struct ip_vs_iter_state)); | |
7a4fbb1f RB |
1199 | } |
1200 | ||
1201 | static const struct file_operations ip_vs_conn_sync_fops = { | |
1202 | .owner = THIS_MODULE, | |
1203 | .open = ip_vs_conn_sync_open, | |
1204 | .read = seq_read, | |
1205 | .llseek = seq_lseek, | |
0f08190f | 1206 | .release = seq_release_net, |
7a4fbb1f RB |
1207 | }; |
1208 | ||
1da177e4 LT |
1209 | #endif |
1210 | ||
1211 | ||
1212 | /* | |
1213 | * Randomly drop connection entries before running out of memory | |
1214 | */ | |
1215 | static inline int todrop_entry(struct ip_vs_conn *cp) | |
1216 | { | |
1217 | /* | |
1218 | * The drop rate array needs tuning for real environments. | |
1219 | * Called from timer bh only => no locking | |
1220 | */ | |
9b5b5cff | 1221 | static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; |
1da177e4 LT |
1222 | static char todrop_counter[9] = {0}; |
1223 | int i; | |
1224 | ||
1225 | /* if the conn entry hasn't lasted for 60 seconds, don't drop it. | |
1226 | This will leave enough time for normal connection to get | |
1227 | through. */ | |
1228 | if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) | |
1229 | return 0; | |
1230 | ||
1231 | /* Don't drop the entry if its number of incoming packets is not | |
1232 | located in [0, 8] */ | |
1233 | i = atomic_read(&cp->in_pkts); | |
1234 | if (i > 8 || i < 0) return 0; | |
1235 | ||
1236 | if (!todrop_rate[i]) return 0; | |
1237 | if (--todrop_counter[i] > 0) return 0; | |
1238 | ||
1239 | todrop_counter[i] = todrop_rate[i]; | |
1240 | return 1; | |
1241 | } | |
1242 | ||
af9debd4 | 1243 | /* Called from keventd and must protect itself from softirqs */ |
423b5595 | 1244 | void ip_vs_random_dropentry(struct netns_ipvs *ipvs) |
1da177e4 LT |
1245 | { |
1246 | int idx; | |
088339a5 | 1247 | struct ip_vs_conn *cp, *cp_c; |
1da177e4 | 1248 | |
a38e5e23 | 1249 | rcu_read_lock(); |
1da177e4 LT |
1250 | /* |
1251 | * Randomly scan 1/32 of the whole table every second | |
1252 | */ | |
6f7edb48 | 1253 | for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) { |
63862b5b | 1254 | unsigned int hash = prandom_u32() & ip_vs_conn_tab_mask; |
1da177e4 | 1255 | |
088339a5 | 1256 | hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { |
87375ab4 | 1257 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) |
1da177e4 LT |
1258 | /* connection template */ |
1259 | continue; | |
423b5595 | 1260 | if (cp->ipvs != ipvs) |
f6340ee0 | 1261 | continue; |
1da177e4 LT |
1262 | if (cp->protocol == IPPROTO_TCP) { |
1263 | switch(cp->state) { | |
1264 | case IP_VS_TCP_S_SYN_RECV: | |
1265 | case IP_VS_TCP_S_SYNACK: | |
1266 | break; | |
1267 | ||
1268 | case IP_VS_TCP_S_ESTABLISHED: | |
1269 | if (todrop_entry(cp)) | |
1270 | break; | |
1271 | continue; | |
1272 | ||
1273 | default: | |
1274 | continue; | |
1275 | } | |
acaac5d8 JA |
1276 | } else if (cp->protocol == IPPROTO_SCTP) { |
1277 | switch (cp->state) { | |
1278 | case IP_VS_SCTP_S_INIT1: | |
1279 | case IP_VS_SCTP_S_INIT: | |
1280 | break; | |
1281 | case IP_VS_SCTP_S_ESTABLISHED: | |
1282 | if (todrop_entry(cp)) | |
1283 | break; | |
1284 | continue; | |
1285 | default: | |
1286 | continue; | |
1287 | } | |
1da177e4 LT |
1288 | } else { |
1289 | if (!todrop_entry(cp)) | |
1290 | continue; | |
1291 | } | |
1292 | ||
1da177e4 LT |
1293 | IP_VS_DBG(4, "del connection\n"); |
1294 | ip_vs_conn_expire_now(cp); | |
088339a5 JA |
1295 | cp_c = cp->control; |
1296 | /* cp->control is valid only with reference to cp */ | |
1297 | if (cp_c && __ip_vs_conn_get(cp)) { | |
1da177e4 | 1298 | IP_VS_DBG(4, "del conn template\n"); |
088339a5 JA |
1299 | ip_vs_conn_expire_now(cp_c); |
1300 | __ip_vs_conn_put(cp); | |
1da177e4 | 1301 | } |
1da177e4 | 1302 | } |
a38e5e23 | 1303 | cond_resched_rcu(); |
1da177e4 | 1304 | } |
a38e5e23 | 1305 | rcu_read_unlock(); |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | ||
1309 | /* | |
1310 | * Flush all the connection entries in the ip_vs_conn_tab | |
1311 | */ | |
d889717a | 1312 | static void ip_vs_conn_flush(struct netns_ipvs *ipvs) |
1da177e4 LT |
1313 | { |
1314 | int idx; | |
088339a5 | 1315 | struct ip_vs_conn *cp, *cp_c; |
1da177e4 | 1316 | |
a0840e2e | 1317 | flush_again: |
a38e5e23 | 1318 | rcu_read_lock(); |
6f7edb48 | 1319 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 | 1320 | |
088339a5 | 1321 | hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) { |
58dbc6f2 | 1322 | if (cp->ipvs != ipvs) |
6e67e586 | 1323 | continue; |
1da177e4 LT |
1324 | IP_VS_DBG(4, "del connection\n"); |
1325 | ip_vs_conn_expire_now(cp); | |
088339a5 JA |
1326 | cp_c = cp->control; |
1327 | /* cp->control is valid only with reference to cp */ | |
1328 | if (cp_c && __ip_vs_conn_get(cp)) { | |
1da177e4 | 1329 | IP_VS_DBG(4, "del conn template\n"); |
088339a5 JA |
1330 | ip_vs_conn_expire_now(cp_c); |
1331 | __ip_vs_conn_put(cp); | |
1da177e4 | 1332 | } |
1da177e4 | 1333 | } |
a38e5e23 | 1334 | cond_resched_rcu(); |
1da177e4 | 1335 | } |
a38e5e23 | 1336 | rcu_read_unlock(); |
1da177e4 LT |
1337 | |
1338 | /* the counter may be not NULL, because maybe some conn entries | |
1339 | are run by slow timer handler or unhashed but still referred */ | |
6e67e586 | 1340 | if (atomic_read(&ipvs->conn_count) != 0) { |
1da177e4 LT |
1341 | schedule(); |
1342 | goto flush_again; | |
1343 | } | |
1344 | } | |
61b1ab45 HS |
1345 | /* |
1346 | * per netns init and exit | |
1347 | */ | |
503cf15a | 1348 | int __net_init ip_vs_conn_net_init(struct net *net) |
61b1ab45 | 1349 | { |
6e67e586 HS |
1350 | struct netns_ipvs *ipvs = net_ipvs(net); |
1351 | ||
6e67e586 | 1352 | atomic_set(&ipvs->conn_count, 0); |
1da177e4 | 1353 | |
d4beaa66 G |
1354 | proc_create("ip_vs_conn", 0, net->proc_net, &ip_vs_conn_fops); |
1355 | proc_create("ip_vs_conn_sync", 0, net->proc_net, &ip_vs_conn_sync_fops); | |
61b1ab45 HS |
1356 | return 0; |
1357 | } | |
1358 | ||
503cf15a | 1359 | void __net_exit ip_vs_conn_net_cleanup(struct net *net) |
61b1ab45 | 1360 | { |
d889717a EB |
1361 | struct netns_ipvs *ipvs = net_ipvs(net); |
1362 | ||
6e67e586 | 1363 | /* flush all the connection entries first */ |
d889717a | 1364 | ip_vs_conn_flush(ipvs); |
ece31ffd G |
1365 | remove_proc_entry("ip_vs_conn", net->proc_net); |
1366 | remove_proc_entry("ip_vs_conn_sync", net->proc_net); | |
61b1ab45 | 1367 | } |
1da177e4 | 1368 | |
048cf48b | 1369 | int __init ip_vs_conn_init(void) |
1da177e4 LT |
1370 | { |
1371 | int idx; | |
1372 | ||
6f7edb48 CB |
1373 | /* Compute size and mask */ |
1374 | ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits; | |
1375 | ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1; | |
1376 | ||
1da177e4 LT |
1377 | /* |
1378 | * Allocate the connection hash table and initialize its list heads | |
1379 | */ | |
731109e7 | 1380 | ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab)); |
1da177e4 LT |
1381 | if (!ip_vs_conn_tab) |
1382 | return -ENOMEM; | |
1383 | ||
1384 | /* Allocate ip_vs_conn slab cache */ | |
1385 | ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", | |
1386 | sizeof(struct ip_vs_conn), 0, | |
20c2df83 | 1387 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1388 | if (!ip_vs_conn_cachep) { |
1389 | vfree(ip_vs_conn_tab); | |
1390 | return -ENOMEM; | |
1391 | } | |
1392 | ||
1e3e238e HE |
1393 | pr_info("Connection hash table configured " |
1394 | "(size=%d, memory=%ldKbytes)\n", | |
6f7edb48 CB |
1395 | ip_vs_conn_tab_size, |
1396 | (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024); | |
1da177e4 LT |
1397 | IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n", |
1398 | sizeof(struct ip_vs_conn)); | |
1399 | ||
731109e7 CG |
1400 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) |
1401 | INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]); | |
1da177e4 LT |
1402 | |
1403 | for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { | |
088339a5 | 1404 | spin_lock_init(&__ip_vs_conntbl_lock_array[idx].l); |
1da177e4 LT |
1405 | } |
1406 | ||
1da177e4 LT |
1407 | /* calculate the random value for connection hash */ |
1408 | get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); | |
1409 | ||
7a4f0761 | 1410 | return 0; |
1da177e4 LT |
1411 | } |
1412 | ||
1da177e4 LT |
1413 | void ip_vs_conn_cleanup(void) |
1414 | { | |
088339a5 JA |
1415 | /* Wait all ip_vs_conn_rcu_free() callbacks to complete */ |
1416 | rcu_barrier(); | |
1da177e4 LT |
1417 | /* Release the empty cache */ |
1418 | kmem_cache_destroy(ip_vs_conn_cachep); | |
1da177e4 LT |
1419 | vfree(ip_vs_conn_tab); |
1420 | } |