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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 | */ | |
4ecd2944 | 51 | static int ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS; |
6f7edb48 CB |
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 */ | |
4ecd2944 ED |
56 | int ip_vs_conn_tab_size __read_mostly; |
57 | static int ip_vs_conn_tab_mask __read_mostly; | |
6f7edb48 | 58 | |
1da177e4 LT |
59 | /* |
60 | * Connection hash table: for input and output packets lookups of IPVS | |
61 | */ | |
731109e7 | 62 | static struct hlist_head *ip_vs_conn_tab __read_mostly; |
1da177e4 LT |
63 | |
64 | /* SLAB cache for IPVS connections */ | |
e18b890b | 65 | static struct kmem_cache *ip_vs_conn_cachep __read_mostly; |
1da177e4 | 66 | |
1da177e4 LT |
67 | /* counter for no client port connections */ |
68 | static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0); | |
69 | ||
70 | /* random value for IPVS connection hash */ | |
4ecd2944 | 71 | static unsigned int ip_vs_conn_rnd __read_mostly; |
1da177e4 LT |
72 | |
73 | /* | |
74 | * Fine locking granularity for big connection hash table | |
75 | */ | |
6e67e586 | 76 | #define CT_LOCKARRAY_BITS 5 |
1da177e4 LT |
77 | #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS) |
78 | #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1) | |
79 | ||
80 | struct ip_vs_aligned_lock | |
81 | { | |
82 | rwlock_t l; | |
83 | } __attribute__((__aligned__(SMP_CACHE_BYTES))); | |
84 | ||
85 | /* lock array for conn table */ | |
86 | static struct ip_vs_aligned_lock | |
87 | __ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned; | |
88 | ||
95c96174 | 89 | static inline void ct_read_lock(unsigned int key) |
1da177e4 LT |
90 | { |
91 | read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
92 | } | |
93 | ||
95c96174 | 94 | static inline void ct_read_unlock(unsigned int key) |
1da177e4 LT |
95 | { |
96 | read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
97 | } | |
98 | ||
95c96174 | 99 | static inline void ct_write_lock(unsigned int key) |
1da177e4 LT |
100 | { |
101 | write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
102 | } | |
103 | ||
95c96174 | 104 | static inline void ct_write_unlock(unsigned int key) |
1da177e4 LT |
105 | { |
106 | write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
107 | } | |
108 | ||
95c96174 | 109 | static inline void ct_read_lock_bh(unsigned int key) |
1da177e4 LT |
110 | { |
111 | read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
112 | } | |
113 | ||
95c96174 | 114 | static inline void ct_read_unlock_bh(unsigned int key) |
1da177e4 LT |
115 | { |
116 | read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
117 | } | |
118 | ||
95c96174 | 119 | static inline void ct_write_lock_bh(unsigned int key) |
1da177e4 LT |
120 | { |
121 | write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
122 | } | |
123 | ||
95c96174 | 124 | static inline void ct_write_unlock_bh(unsigned int key) |
1da177e4 LT |
125 | { |
126 | write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); | |
127 | } | |
128 | ||
129 | ||
130 | /* | |
131 | * Returns hash value for IPVS connection entry | |
132 | */ | |
95c96174 | 133 | static unsigned int ip_vs_conn_hashkey(struct net *net, int af, unsigned int proto, |
28364a59 JV |
134 | const union nf_inet_addr *addr, |
135 | __be16 port) | |
1da177e4 | 136 | { |
28364a59 JV |
137 | #ifdef CONFIG_IP_VS_IPV6 |
138 | if (af == AF_INET6) | |
6e67e586 HS |
139 | return (jhash_3words(jhash(addr, 16, ip_vs_conn_rnd), |
140 | (__force u32)port, proto, ip_vs_conn_rnd) ^ | |
141 | ((size_t)net>>8)) & ip_vs_conn_tab_mask; | |
28364a59 | 142 | #endif |
6e67e586 HS |
143 | return (jhash_3words((__force u32)addr->ip, (__force u32)port, proto, |
144 | ip_vs_conn_rnd) ^ | |
145 | ((size_t)net>>8)) & ip_vs_conn_tab_mask; | |
1da177e4 LT |
146 | } |
147 | ||
85999283 SH |
148 | static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p, |
149 | bool inverse) | |
150 | { | |
151 | const union nf_inet_addr *addr; | |
152 | __be16 port; | |
153 | ||
f71499aa | 154 | if (p->pe_data && p->pe->hashkey_raw) |
85999283 SH |
155 | return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) & |
156 | ip_vs_conn_tab_mask; | |
157 | ||
158 | if (likely(!inverse)) { | |
159 | addr = p->caddr; | |
160 | port = p->cport; | |
161 | } else { | |
162 | addr = p->vaddr; | |
163 | port = p->vport; | |
164 | } | |
165 | ||
6e67e586 | 166 | return ip_vs_conn_hashkey(p->net, p->af, p->protocol, addr, port); |
85999283 SH |
167 | } |
168 | ||
169 | static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp) | |
170 | { | |
171 | struct ip_vs_conn_param p; | |
172 | ||
6e67e586 HS |
173 | ip_vs_conn_fill_param(ip_vs_conn_net(cp), cp->af, cp->protocol, |
174 | &cp->caddr, cp->cport, NULL, 0, &p); | |
85999283 | 175 | |
e9e5eee8 SH |
176 | if (cp->pe) { |
177 | p.pe = cp->pe; | |
85999283 SH |
178 | p.pe_data = cp->pe_data; |
179 | p.pe_data_len = cp->pe_data_len; | |
180 | } | |
181 | ||
182 | return ip_vs_conn_hashkey_param(&p, false); | |
183 | } | |
1da177e4 LT |
184 | |
185 | /* | |
6e67e586 | 186 | * Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port. |
1da177e4 LT |
187 | * returns bool success. |
188 | */ | |
189 | static inline int ip_vs_conn_hash(struct ip_vs_conn *cp) | |
190 | { | |
95c96174 | 191 | unsigned int hash; |
1da177e4 LT |
192 | int ret; |
193 | ||
26ec037f NC |
194 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) |
195 | return 0; | |
196 | ||
1da177e4 | 197 | /* Hash by protocol, client address and port */ |
85999283 | 198 | hash = ip_vs_conn_hashkey_conn(cp); |
1da177e4 LT |
199 | |
200 | ct_write_lock(hash); | |
aea9d711 | 201 | spin_lock(&cp->lock); |
1da177e4 LT |
202 | |
203 | if (!(cp->flags & IP_VS_CONN_F_HASHED)) { | |
731109e7 | 204 | hlist_add_head(&cp->c_list, &ip_vs_conn_tab[hash]); |
1da177e4 LT |
205 | cp->flags |= IP_VS_CONN_F_HASHED; |
206 | atomic_inc(&cp->refcnt); | |
207 | ret = 1; | |
208 | } else { | |
1e3e238e HE |
209 | pr_err("%s(): request for already hashed, called from %pF\n", |
210 | __func__, __builtin_return_address(0)); | |
1da177e4 LT |
211 | ret = 0; |
212 | } | |
213 | ||
aea9d711 | 214 | spin_unlock(&cp->lock); |
1da177e4 LT |
215 | ct_write_unlock(hash); |
216 | ||
217 | return ret; | |
218 | } | |
219 | ||
220 | ||
221 | /* | |
222 | * UNhashes ip_vs_conn from ip_vs_conn_tab. | |
223 | * returns bool success. | |
224 | */ | |
225 | static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp) | |
226 | { | |
95c96174 | 227 | unsigned int hash; |
1da177e4 LT |
228 | int ret; |
229 | ||
230 | /* unhash it and decrease its reference counter */ | |
85999283 | 231 | hash = ip_vs_conn_hashkey_conn(cp); |
1da177e4 LT |
232 | |
233 | ct_write_lock(hash); | |
aea9d711 | 234 | spin_lock(&cp->lock); |
1da177e4 LT |
235 | |
236 | if (cp->flags & IP_VS_CONN_F_HASHED) { | |
731109e7 | 237 | hlist_del(&cp->c_list); |
1da177e4 LT |
238 | cp->flags &= ~IP_VS_CONN_F_HASHED; |
239 | atomic_dec(&cp->refcnt); | |
240 | ret = 1; | |
241 | } else | |
242 | ret = 0; | |
243 | ||
aea9d711 | 244 | spin_unlock(&cp->lock); |
1da177e4 LT |
245 | ct_write_unlock(hash); |
246 | ||
247 | return ret; | |
248 | } | |
249 | ||
250 | ||
251 | /* | |
252 | * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. | |
253 | * Called for pkts coming from OUTside-to-INside. | |
f11017ec SH |
254 | * p->caddr, p->cport: pkt source address (foreign host) |
255 | * p->vaddr, p->vport: pkt dest address (load balancer) | |
1da177e4 | 256 | */ |
f11017ec SH |
257 | static inline struct ip_vs_conn * |
258 | __ip_vs_conn_in_get(const struct ip_vs_conn_param *p) | |
1da177e4 | 259 | { |
95c96174 | 260 | unsigned int hash; |
1da177e4 | 261 | struct ip_vs_conn *cp; |
731109e7 | 262 | struct hlist_node *n; |
1da177e4 | 263 | |
85999283 | 264 | hash = ip_vs_conn_hashkey_param(p, false); |
1da177e4 LT |
265 | |
266 | ct_read_lock(hash); | |
267 | ||
731109e7 | 268 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) { |
f11017ec | 269 | if (cp->af == p->af && |
6e67e586 | 270 | p->cport == cp->cport && p->vport == cp->vport && |
f11017ec SH |
271 | ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && |
272 | ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) && | |
f11017ec | 273 | ((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) && |
6e67e586 HS |
274 | p->protocol == cp->protocol && |
275 | ip_vs_conn_net_eq(cp, p->net)) { | |
1da177e4 LT |
276 | /* HIT */ |
277 | atomic_inc(&cp->refcnt); | |
278 | ct_read_unlock(hash); | |
279 | return cp; | |
280 | } | |
281 | } | |
282 | ||
283 | ct_read_unlock(hash); | |
284 | ||
285 | return NULL; | |
286 | } | |
287 | ||
f11017ec | 288 | struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p) |
1da177e4 LT |
289 | { |
290 | struct ip_vs_conn *cp; | |
291 | ||
f11017ec SH |
292 | cp = __ip_vs_conn_in_get(p); |
293 | if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) { | |
294 | struct ip_vs_conn_param cport_zero_p = *p; | |
295 | cport_zero_p.cport = 0; | |
296 | cp = __ip_vs_conn_in_get(&cport_zero_p); | |
297 | } | |
1da177e4 | 298 | |
28364a59 | 299 | IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n", |
f11017ec SH |
300 | ip_vs_proto_name(p->protocol), |
301 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
302 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 303 | cp ? "hit" : "not hit"); |
1da177e4 LT |
304 | |
305 | return cp; | |
306 | } | |
307 | ||
f11017ec SH |
308 | static int |
309 | ip_vs_conn_fill_param_proto(int af, const struct sk_buff *skb, | |
310 | const struct ip_vs_iphdr *iph, | |
311 | unsigned int proto_off, int inverse, | |
312 | struct ip_vs_conn_param *p) | |
313 | { | |
314 | __be16 _ports[2], *pptr; | |
6e67e586 | 315 | struct net *net = skb_net(skb); |
f11017ec SH |
316 | |
317 | pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); | |
318 | if (pptr == NULL) | |
319 | return 1; | |
320 | ||
321 | if (likely(!inverse)) | |
6e67e586 HS |
322 | ip_vs_conn_fill_param(net, af, iph->protocol, &iph->saddr, |
323 | pptr[0], &iph->daddr, pptr[1], p); | |
f11017ec | 324 | else |
6e67e586 HS |
325 | ip_vs_conn_fill_param(net, af, iph->protocol, &iph->daddr, |
326 | pptr[1], &iph->saddr, pptr[0], p); | |
f11017ec SH |
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, | |
5c0d2374 SH |
332 | const struct ip_vs_iphdr *iph, |
333 | unsigned int proto_off, int inverse) | |
334 | { | |
f11017ec | 335 | struct ip_vs_conn_param p; |
5c0d2374 | 336 | |
f11017ec | 337 | if (ip_vs_conn_fill_param_proto(af, skb, iph, proto_off, inverse, &p)) |
5c0d2374 SH |
338 | return NULL; |
339 | ||
f11017ec | 340 | return ip_vs_conn_in_get(&p); |
5c0d2374 SH |
341 | } |
342 | EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto); | |
343 | ||
87375ab4 | 344 | /* Get reference to connection template */ |
f11017ec | 345 | struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p) |
87375ab4 | 346 | { |
95c96174 | 347 | unsigned int hash; |
87375ab4 | 348 | struct ip_vs_conn *cp; |
731109e7 | 349 | struct hlist_node *n; |
87375ab4 | 350 | |
85999283 | 351 | hash = ip_vs_conn_hashkey_param(p, false); |
87375ab4 JA |
352 | |
353 | ct_read_lock(hash); | |
354 | ||
731109e7 | 355 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) { |
6e67e586 HS |
356 | if (!ip_vs_conn_net_eq(cp, p->net)) |
357 | continue; | |
f71499aa | 358 | if (p->pe_data && p->pe->ct_match) { |
ea2c73af | 359 | if (p->pe == cp->pe && p->pe->ct_match(p, cp)) |
85999283 SH |
360 | goto out; |
361 | continue; | |
362 | } | |
363 | ||
f11017ec SH |
364 | if (cp->af == p->af && |
365 | ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && | |
be8be9ec | 366 | /* protocol should only be IPPROTO_IP if |
f11017ec SH |
367 | * p->vaddr is a fwmark */ |
368 | ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC : | |
369 | p->af, p->vaddr, &cp->vaddr) && | |
370 | p->cport == cp->cport && p->vport == cp->vport && | |
87375ab4 | 371 | cp->flags & IP_VS_CONN_F_TEMPLATE && |
85999283 | 372 | p->protocol == cp->protocol) |
87375ab4 | 373 | goto out; |
87375ab4 JA |
374 | } |
375 | cp = NULL; | |
376 | ||
377 | out: | |
85999283 SH |
378 | if (cp) |
379 | atomic_inc(&cp->refcnt); | |
87375ab4 JA |
380 | ct_read_unlock(hash); |
381 | ||
28364a59 | 382 | IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n", |
f11017ec SH |
383 | ip_vs_proto_name(p->protocol), |
384 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
385 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 386 | cp ? "hit" : "not hit"); |
87375ab4 JA |
387 | |
388 | return cp; | |
389 | } | |
1da177e4 | 390 | |
f11017ec SH |
391 | /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. |
392 | * Called for pkts coming from inside-to-OUTside. | |
393 | * p->caddr, p->cport: pkt source address (inside host) | |
394 | * p->vaddr, p->vport: pkt dest address (foreign host) */ | |
395 | struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p) | |
1da177e4 | 396 | { |
95c96174 | 397 | unsigned int hash; |
1da177e4 | 398 | struct ip_vs_conn *cp, *ret=NULL; |
731109e7 | 399 | struct hlist_node *n; |
1da177e4 LT |
400 | |
401 | /* | |
402 | * Check for "full" addressed entries | |
403 | */ | |
85999283 | 404 | hash = ip_vs_conn_hashkey_param(p, true); |
1da177e4 LT |
405 | |
406 | ct_read_lock(hash); | |
407 | ||
731109e7 | 408 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) { |
f11017ec | 409 | if (cp->af == p->af && |
6e67e586 | 410 | p->vport == cp->cport && p->cport == cp->dport && |
f11017ec SH |
411 | ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) && |
412 | ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) && | |
6e67e586 HS |
413 | p->protocol == cp->protocol && |
414 | ip_vs_conn_net_eq(cp, p->net)) { | |
1da177e4 LT |
415 | /* HIT */ |
416 | atomic_inc(&cp->refcnt); | |
417 | ret = cp; | |
418 | break; | |
419 | } | |
420 | } | |
421 | ||
422 | ct_read_unlock(hash); | |
423 | ||
28364a59 | 424 | IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n", |
f11017ec SH |
425 | ip_vs_proto_name(p->protocol), |
426 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
427 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 428 | ret ? "hit" : "not hit"); |
1da177e4 LT |
429 | |
430 | return ret; | |
431 | } | |
432 | ||
5c0d2374 SH |
433 | struct ip_vs_conn * |
434 | ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, | |
5c0d2374 SH |
435 | const struct ip_vs_iphdr *iph, |
436 | unsigned int proto_off, int inverse) | |
437 | { | |
f11017ec | 438 | struct ip_vs_conn_param p; |
5c0d2374 | 439 | |
f11017ec | 440 | if (ip_vs_conn_fill_param_proto(af, skb, iph, proto_off, inverse, &p)) |
5c0d2374 SH |
441 | return NULL; |
442 | ||
f11017ec | 443 | return ip_vs_conn_out_get(&p); |
5c0d2374 SH |
444 | } |
445 | EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto); | |
1da177e4 LT |
446 | |
447 | /* | |
448 | * Put back the conn and restart its timer with its timeout | |
449 | */ | |
450 | void ip_vs_conn_put(struct ip_vs_conn *cp) | |
451 | { | |
26ec037f NC |
452 | unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ? |
453 | 0 : cp->timeout; | |
454 | mod_timer(&cp->timer, jiffies+t); | |
1da177e4 LT |
455 | |
456 | __ip_vs_conn_put(cp); | |
457 | } | |
458 | ||
459 | ||
460 | /* | |
461 | * Fill a no_client_port connection with a client port number | |
462 | */ | |
014d730d | 463 | void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) |
1da177e4 LT |
464 | { |
465 | if (ip_vs_conn_unhash(cp)) { | |
466 | spin_lock(&cp->lock); | |
467 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) { | |
468 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
469 | cp->flags &= ~IP_VS_CONN_F_NO_CPORT; | |
470 | cp->cport = cport; | |
471 | } | |
472 | spin_unlock(&cp->lock); | |
473 | ||
474 | /* hash on new dport */ | |
475 | ip_vs_conn_hash(cp); | |
476 | } | |
477 | } | |
478 | ||
479 | ||
480 | /* | |
481 | * Bind a connection entry with the corresponding packet_xmit. | |
482 | * Called by ip_vs_conn_new. | |
483 | */ | |
484 | static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) | |
485 | { | |
486 | switch (IP_VS_FWD_METHOD(cp)) { | |
487 | case IP_VS_CONN_F_MASQ: | |
488 | cp->packet_xmit = ip_vs_nat_xmit; | |
489 | break; | |
490 | ||
491 | case IP_VS_CONN_F_TUNNEL: | |
492 | cp->packet_xmit = ip_vs_tunnel_xmit; | |
493 | break; | |
494 | ||
495 | case IP_VS_CONN_F_DROUTE: | |
496 | cp->packet_xmit = ip_vs_dr_xmit; | |
497 | break; | |
498 | ||
499 | case IP_VS_CONN_F_LOCALNODE: | |
500 | cp->packet_xmit = ip_vs_null_xmit; | |
501 | break; | |
502 | ||
503 | case IP_VS_CONN_F_BYPASS: | |
504 | cp->packet_xmit = ip_vs_bypass_xmit; | |
505 | break; | |
506 | } | |
507 | } | |
508 | ||
b3cdd2a7 JV |
509 | #ifdef CONFIG_IP_VS_IPV6 |
510 | static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp) | |
511 | { | |
512 | switch (IP_VS_FWD_METHOD(cp)) { | |
513 | case IP_VS_CONN_F_MASQ: | |
514 | cp->packet_xmit = ip_vs_nat_xmit_v6; | |
515 | break; | |
516 | ||
517 | case IP_VS_CONN_F_TUNNEL: | |
518 | cp->packet_xmit = ip_vs_tunnel_xmit_v6; | |
519 | break; | |
520 | ||
521 | case IP_VS_CONN_F_DROUTE: | |
522 | cp->packet_xmit = ip_vs_dr_xmit_v6; | |
523 | break; | |
524 | ||
525 | case IP_VS_CONN_F_LOCALNODE: | |
526 | cp->packet_xmit = ip_vs_null_xmit; | |
527 | break; | |
528 | ||
529 | case IP_VS_CONN_F_BYPASS: | |
530 | cp->packet_xmit = ip_vs_bypass_xmit_v6; | |
531 | break; | |
532 | } | |
533 | } | |
534 | #endif | |
535 | ||
1da177e4 LT |
536 | |
537 | static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) | |
538 | { | |
539 | return atomic_read(&dest->activeconns) | |
540 | + atomic_read(&dest->inactconns); | |
541 | } | |
542 | ||
543 | /* | |
544 | * Bind a connection entry with a virtual service destination | |
545 | * Called just after a new connection entry is created. | |
546 | */ | |
547 | static inline void | |
548 | ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) | |
549 | { | |
3575792e JA |
550 | unsigned int conn_flags; |
551 | ||
1da177e4 LT |
552 | /* if dest is NULL, then return directly */ |
553 | if (!dest) | |
554 | return; | |
555 | ||
556 | /* Increase the refcnt counter of the dest */ | |
557 | atomic_inc(&dest->refcnt); | |
558 | ||
3575792e JA |
559 | conn_flags = atomic_read(&dest->conn_flags); |
560 | if (cp->protocol != IPPROTO_UDP) | |
561 | conn_flags &= ~IP_VS_CONN_F_ONE_PACKET; | |
1da177e4 | 562 | /* Bind with the destination and its corresponding transmitter */ |
3575792e | 563 | if (cp->flags & IP_VS_CONN_F_SYNC) { |
b209639e RB |
564 | /* if the connection is not template and is created |
565 | * by sync, preserve the activity flag. | |
566 | */ | |
3575792e JA |
567 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) |
568 | conn_flags &= ~IP_VS_CONN_F_INACTIVE; | |
3233759b | 569 | /* connections inherit forwarding method from dest */ |
82cfc062 | 570 | cp->flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT); |
3575792e JA |
571 | } |
572 | cp->flags |= conn_flags; | |
1da177e4 LT |
573 | cp->dest = dest; |
574 | ||
cfc78c5a JV |
575 | IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d " |
576 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
577 | "dest->refcnt:%d\n", | |
578 | ip_vs_proto_name(cp->protocol), | |
579 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
580 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
581 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
582 | ip_vs_fwd_tag(cp), cp->state, | |
583 | cp->flags, atomic_read(&cp->refcnt), | |
584 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
585 | |
586 | /* Update the connection counters */ | |
87375ab4 | 587 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
06611f82 JA |
588 | /* It is a normal connection, so modify the counters |
589 | * according to the flags, later the protocol can | |
590 | * update them on state change | |
591 | */ | |
592 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE)) | |
b209639e RB |
593 | atomic_inc(&dest->activeconns); |
594 | else | |
595 | atomic_inc(&dest->inactconns); | |
1da177e4 LT |
596 | } else { |
597 | /* It is a persistent connection/template, so increase | |
25985edc | 598 | the persistent connection counter */ |
1da177e4 LT |
599 | atomic_inc(&dest->persistconns); |
600 | } | |
601 | ||
602 | if (dest->u_threshold != 0 && | |
603 | ip_vs_dest_totalconns(dest) >= dest->u_threshold) | |
604 | dest->flags |= IP_VS_DEST_F_OVERLOAD; | |
605 | } | |
606 | ||
607 | ||
1e356f9c RB |
608 | /* |
609 | * Check if there is a destination for the connection, if so | |
610 | * bind the connection to the destination. | |
611 | */ | |
612 | struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp) | |
613 | { | |
614 | struct ip_vs_dest *dest; | |
615 | ||
616 | if ((cp) && (!cp->dest)) { | |
6e67e586 HS |
617 | dest = ip_vs_find_dest(ip_vs_conn_net(cp), cp->af, &cp->daddr, |
618 | cp->dport, &cp->vaddr, cp->vport, | |
52793dbe | 619 | cp->protocol, cp->fwmark, cp->flags); |
1e356f9c RB |
620 | ip_vs_bind_dest(cp, dest); |
621 | return dest; | |
622 | } else | |
623 | return NULL; | |
624 | } | |
1e356f9c RB |
625 | |
626 | ||
1da177e4 LT |
627 | /* |
628 | * Unbind a connection entry with its VS destination | |
629 | * Called by the ip_vs_conn_expire function. | |
630 | */ | |
631 | static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) | |
632 | { | |
633 | struct ip_vs_dest *dest = cp->dest; | |
634 | ||
635 | if (!dest) | |
636 | return; | |
637 | ||
cfc78c5a JV |
638 | IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d " |
639 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
640 | "dest->refcnt:%d\n", | |
641 | ip_vs_proto_name(cp->protocol), | |
642 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
643 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
644 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
645 | ip_vs_fwd_tag(cp), cp->state, | |
646 | cp->flags, atomic_read(&cp->refcnt), | |
647 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
648 | |
649 | /* Update the connection counters */ | |
87375ab4 | 650 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
651 | /* It is a normal connection, so decrease the inactconns |
652 | or activeconns counter */ | |
653 | if (cp->flags & IP_VS_CONN_F_INACTIVE) { | |
654 | atomic_dec(&dest->inactconns); | |
655 | } else { | |
656 | atomic_dec(&dest->activeconns); | |
657 | } | |
658 | } else { | |
659 | /* It is a persistent connection/template, so decrease | |
25985edc | 660 | the persistent connection counter */ |
1da177e4 LT |
661 | atomic_dec(&dest->persistconns); |
662 | } | |
663 | ||
664 | if (dest->l_threshold != 0) { | |
665 | if (ip_vs_dest_totalconns(dest) < dest->l_threshold) | |
666 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
667 | } else if (dest->u_threshold != 0) { | |
668 | if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) | |
669 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
670 | } else { | |
671 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
672 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
673 | } | |
674 | ||
675 | /* | |
676 | * Simply decrease the refcnt of the dest, because the | |
677 | * dest will be either in service's destination list | |
678 | * or in the trash. | |
679 | */ | |
680 | atomic_dec(&dest->refcnt); | |
681 | } | |
682 | ||
8e1b0b1b SH |
683 | static int expire_quiescent_template(struct netns_ipvs *ipvs, |
684 | struct ip_vs_dest *dest) | |
685 | { | |
686 | #ifdef CONFIG_SYSCTL | |
687 | return ipvs->sysctl_expire_quiescent_template && | |
688 | (atomic_read(&dest->weight) == 0); | |
689 | #else | |
690 | return 0; | |
691 | #endif | |
692 | } | |
1da177e4 LT |
693 | |
694 | /* | |
695 | * Checking if the destination of a connection template is available. | |
696 | * If available, return 1, otherwise invalidate this connection | |
697 | * template and return 0. | |
698 | */ | |
699 | int ip_vs_check_template(struct ip_vs_conn *ct) | |
700 | { | |
701 | struct ip_vs_dest *dest = ct->dest; | |
a0840e2e | 702 | struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(ct)); |
1da177e4 LT |
703 | |
704 | /* | |
705 | * Checking the dest server status. | |
706 | */ | |
707 | if ((dest == NULL) || | |
e905a9ed | 708 | !(dest->flags & IP_VS_DEST_F_AVAILABLE) || |
8e1b0b1b | 709 | expire_quiescent_template(ipvs, dest)) { |
cfc78c5a JV |
710 | IP_VS_DBG_BUF(9, "check_template: dest not available for " |
711 | "protocol %s s:%s:%d v:%s:%d " | |
712 | "-> d:%s:%d\n", | |
713 | ip_vs_proto_name(ct->protocol), | |
714 | IP_VS_DBG_ADDR(ct->af, &ct->caddr), | |
715 | ntohs(ct->cport), | |
716 | IP_VS_DBG_ADDR(ct->af, &ct->vaddr), | |
717 | ntohs(ct->vport), | |
718 | IP_VS_DBG_ADDR(ct->af, &ct->daddr), | |
719 | ntohs(ct->dport)); | |
1da177e4 LT |
720 | |
721 | /* | |
722 | * Invalidate the connection template | |
723 | */ | |
014d730d | 724 | if (ct->vport != htons(0xffff)) { |
1da177e4 | 725 | if (ip_vs_conn_unhash(ct)) { |
014d730d AV |
726 | ct->dport = htons(0xffff); |
727 | ct->vport = htons(0xffff); | |
1da177e4 LT |
728 | ct->cport = 0; |
729 | ip_vs_conn_hash(ct); | |
730 | } | |
731 | } | |
732 | ||
733 | /* | |
734 | * Simply decrease the refcnt of the template, | |
735 | * don't restart its timer. | |
736 | */ | |
737 | atomic_dec(&ct->refcnt); | |
738 | return 0; | |
739 | } | |
740 | return 1; | |
741 | } | |
742 | ||
743 | static void ip_vs_conn_expire(unsigned long data) | |
744 | { | |
745 | struct ip_vs_conn *cp = (struct ip_vs_conn *)data; | |
6e67e586 | 746 | struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(cp)); |
1da177e4 LT |
747 | |
748 | cp->timeout = 60*HZ; | |
749 | ||
750 | /* | |
751 | * hey, I'm using it | |
752 | */ | |
753 | atomic_inc(&cp->refcnt); | |
754 | ||
755 | /* | |
756 | * do I control anybody? | |
757 | */ | |
758 | if (atomic_read(&cp->n_control)) | |
759 | goto expire_later; | |
760 | ||
761 | /* | |
762 | * unhash it if it is hashed in the conn table | |
763 | */ | |
26ec037f | 764 | if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET)) |
1da177e4 LT |
765 | goto expire_later; |
766 | ||
767 | /* | |
768 | * refcnt==1 implies I'm the only one referrer | |
769 | */ | |
770 | if (likely(atomic_read(&cp->refcnt) == 1)) { | |
771 | /* delete the timer if it is activated by other users */ | |
772 | if (timer_pending(&cp->timer)) | |
773 | del_timer(&cp->timer); | |
774 | ||
775 | /* does anybody control me? */ | |
776 | if (cp->control) | |
777 | ip_vs_control_del(cp); | |
778 | ||
8f4e0a18 | 779 | if (cp->flags & IP_VS_CONN_F_NFCT) { |
f4bc17cd | 780 | ip_vs_conn_drop_conntrack(cp); |
8f4e0a18 HS |
781 | /* Do not access conntracks during subsys cleanup |
782 | * because nf_conntrack_find_get can not be used after | |
783 | * conntrack cleanup for the net. | |
784 | */ | |
785 | smp_rmb(); | |
786 | if (ipvs->enable) | |
787 | ip_vs_conn_drop_conntrack(cp); | |
788 | } | |
f4bc17cd | 789 | |
e9e5eee8 | 790 | ip_vs_pe_put(cp->pe); |
85999283 | 791 | kfree(cp->pe_data); |
1da177e4 LT |
792 | if (unlikely(cp->app != NULL)) |
793 | ip_vs_unbind_app(cp); | |
794 | ip_vs_unbind_dest(cp); | |
795 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) | |
796 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
6e67e586 | 797 | atomic_dec(&ipvs->conn_count); |
1da177e4 LT |
798 | |
799 | kmem_cache_free(ip_vs_conn_cachep, cp); | |
800 | return; | |
801 | } | |
802 | ||
803 | /* hash it back to the table */ | |
804 | ip_vs_conn_hash(cp); | |
805 | ||
806 | expire_later: | |
4b5bdf5c | 807 | IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n", |
1da177e4 LT |
808 | atomic_read(&cp->refcnt)-1, |
809 | atomic_read(&cp->n_control)); | |
810 | ||
811 | ip_vs_conn_put(cp); | |
812 | } | |
813 | ||
814 | ||
815 | void ip_vs_conn_expire_now(struct ip_vs_conn *cp) | |
816 | { | |
817 | if (del_timer(&cp->timer)) | |
818 | mod_timer(&cp->timer, jiffies); | |
1da177e4 LT |
819 | } |
820 | ||
821 | ||
822 | /* | |
823 | * Create a new connection entry and hash it into the ip_vs_conn_tab | |
824 | */ | |
825 | struct ip_vs_conn * | |
f11017ec | 826 | ip_vs_conn_new(const struct ip_vs_conn_param *p, |
95c96174 | 827 | const union nf_inet_addr *daddr, __be16 dport, unsigned int flags, |
0e051e68 | 828 | struct ip_vs_dest *dest, __u32 fwmark) |
1da177e4 LT |
829 | { |
830 | struct ip_vs_conn *cp; | |
6e67e586 HS |
831 | struct netns_ipvs *ipvs = net_ipvs(p->net); |
832 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net, | |
833 | p->protocol); | |
1da177e4 | 834 | |
c3762229 | 835 | cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC); |
1da177e4 | 836 | if (cp == NULL) { |
1e3e238e | 837 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
838 | return NULL; |
839 | } | |
840 | ||
731109e7 | 841 | INIT_HLIST_NODE(&cp->c_list); |
b24b8a24 | 842 | setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp); |
6e67e586 | 843 | ip_vs_conn_net_set(cp, p->net); |
f11017ec SH |
844 | cp->af = p->af; |
845 | cp->protocol = p->protocol; | |
846 | ip_vs_addr_copy(p->af, &cp->caddr, p->caddr); | |
847 | cp->cport = p->cport; | |
848 | ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr); | |
849 | cp->vport = p->vport; | |
be8be9ec | 850 | /* proto should only be IPPROTO_IP if d_addr is a fwmark */ |
f11017ec | 851 | ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af, |
be8be9ec | 852 | &cp->daddr, daddr); |
1da177e4 LT |
853 | cp->dport = dport; |
854 | cp->flags = flags; | |
0e051e68 | 855 | cp->fwmark = fwmark; |
e9e5eee8 SH |
856 | if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) { |
857 | ip_vs_pe_get(p->pe); | |
858 | cp->pe = p->pe; | |
85999283 SH |
859 | cp->pe_data = p->pe_data; |
860 | cp->pe_data_len = p->pe_data_len; | |
861 | } | |
1da177e4 LT |
862 | spin_lock_init(&cp->lock); |
863 | ||
864 | /* | |
865 | * Set the entry is referenced by the current thread before hashing | |
866 | * it in the table, so that other thread run ip_vs_random_dropentry | |
867 | * but cannot drop this entry. | |
868 | */ | |
869 | atomic_set(&cp->refcnt, 1); | |
870 | ||
871 | atomic_set(&cp->n_control, 0); | |
872 | atomic_set(&cp->in_pkts, 0); | |
873 | ||
6e67e586 | 874 | atomic_inc(&ipvs->conn_count); |
1da177e4 LT |
875 | if (flags & IP_VS_CONN_F_NO_CPORT) |
876 | atomic_inc(&ip_vs_conn_no_cport_cnt); | |
877 | ||
878 | /* Bind the connection with a destination server */ | |
879 | ip_vs_bind_dest(cp, dest); | |
880 | ||
881 | /* Set its state and timeout */ | |
882 | cp->state = 0; | |
883 | cp->timeout = 3*HZ; | |
884 | ||
885 | /* Bind its packet transmitter */ | |
b3cdd2a7 | 886 | #ifdef CONFIG_IP_VS_IPV6 |
f11017ec | 887 | if (p->af == AF_INET6) |
b3cdd2a7 JV |
888 | ip_vs_bind_xmit_v6(cp); |
889 | else | |
890 | #endif | |
891 | ip_vs_bind_xmit(cp); | |
1da177e4 | 892 | |
9bbac6a9 HS |
893 | if (unlikely(pd && atomic_read(&pd->appcnt))) |
894 | ip_vs_bind_app(cp, pd->pp); | |
1da177e4 | 895 | |
f4bc17cd JA |
896 | /* |
897 | * Allow conntrack to be preserved. By default, conntrack | |
898 | * is created and destroyed for every packet. | |
899 | * Sometimes keeping conntrack can be useful for | |
900 | * IP_VS_CONN_F_ONE_PACKET too. | |
901 | */ | |
902 | ||
a0840e2e | 903 | if (ip_vs_conntrack_enabled(ipvs)) |
f4bc17cd JA |
904 | cp->flags |= IP_VS_CONN_F_NFCT; |
905 | ||
1da177e4 LT |
906 | /* Hash it in the ip_vs_conn_tab finally */ |
907 | ip_vs_conn_hash(cp); | |
908 | ||
909 | return cp; | |
910 | } | |
911 | ||
1da177e4 LT |
912 | /* |
913 | * /proc/net/ip_vs_conn entries | |
914 | */ | |
915 | #ifdef CONFIG_PROC_FS | |
6e67e586 | 916 | struct ip_vs_iter_state { |
731109e7 CG |
917 | struct seq_net_private p; |
918 | struct hlist_head *l; | |
6e67e586 | 919 | }; |
1da177e4 LT |
920 | |
921 | static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) | |
922 | { | |
923 | int idx; | |
924 | struct ip_vs_conn *cp; | |
6e67e586 | 925 | struct ip_vs_iter_state *iter = seq->private; |
731109e7 | 926 | struct hlist_node *n; |
e905a9ed | 927 | |
6f7edb48 | 928 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 | 929 | ct_read_lock_bh(idx); |
731109e7 | 930 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) { |
1da177e4 | 931 | if (pos-- == 0) { |
6e67e586 | 932 | iter->l = &ip_vs_conn_tab[idx]; |
731109e7 | 933 | return cp; |
1da177e4 LT |
934 | } |
935 | } | |
936 | ct_read_unlock_bh(idx); | |
937 | } | |
938 | ||
939 | return NULL; | |
940 | } | |
941 | ||
942 | static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) | |
943 | { | |
6e67e586 HS |
944 | struct ip_vs_iter_state *iter = seq->private; |
945 | ||
946 | iter->l = NULL; | |
1da177e4 LT |
947 | return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; |
948 | } | |
949 | ||
950 | static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
951 | { | |
952 | struct ip_vs_conn *cp = v; | |
6e67e586 | 953 | struct ip_vs_iter_state *iter = seq->private; |
731109e7 CG |
954 | struct hlist_node *e; |
955 | struct hlist_head *l = iter->l; | |
1da177e4 LT |
956 | int idx; |
957 | ||
958 | ++*pos; | |
e905a9ed | 959 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
960 | return ip_vs_conn_array(seq, 0); |
961 | ||
962 | /* more on same hash chain? */ | |
731109e7 CG |
963 | if ((e = cp->c_list.next)) |
964 | return hlist_entry(e, struct ip_vs_conn, c_list); | |
1da177e4 LT |
965 | |
966 | idx = l - ip_vs_conn_tab; | |
967 | ct_read_unlock_bh(idx); | |
968 | ||
6f7edb48 | 969 | while (++idx < ip_vs_conn_tab_size) { |
1da177e4 | 970 | ct_read_lock_bh(idx); |
731109e7 | 971 | hlist_for_each_entry(cp, e, &ip_vs_conn_tab[idx], c_list) { |
6e67e586 | 972 | iter->l = &ip_vs_conn_tab[idx]; |
1da177e4 | 973 | return cp; |
e905a9ed | 974 | } |
1da177e4 LT |
975 | ct_read_unlock_bh(idx); |
976 | } | |
6e67e586 | 977 | iter->l = NULL; |
1da177e4 LT |
978 | return NULL; |
979 | } | |
980 | ||
981 | static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) | |
982 | { | |
6e67e586 | 983 | struct ip_vs_iter_state *iter = seq->private; |
731109e7 | 984 | struct hlist_head *l = iter->l; |
1da177e4 LT |
985 | |
986 | if (l) | |
987 | ct_read_unlock_bh(l - ip_vs_conn_tab); | |
988 | } | |
989 | ||
990 | static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) | |
991 | { | |
992 | ||
993 | if (v == SEQ_START_TOKEN) | |
994 | seq_puts(seq, | |
a3c918ac | 995 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n"); |
1da177e4 LT |
996 | else { |
997 | const struct ip_vs_conn *cp = v; | |
6e67e586 | 998 | struct net *net = seq_file_net(seq); |
a3c918ac SH |
999 | char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3]; |
1000 | size_t len = 0; | |
1001 | ||
6e67e586 HS |
1002 | if (!ip_vs_conn_net_eq(cp, net)) |
1003 | return 0; | |
e9e5eee8 | 1004 | if (cp->pe_data) { |
a3c918ac | 1005 | pe_data[0] = ' '; |
e9e5eee8 SH |
1006 | len = strlen(cp->pe->name); |
1007 | memcpy(pe_data + 1, cp->pe->name, len); | |
a3c918ac SH |
1008 | pe_data[len + 1] = ' '; |
1009 | len += 2; | |
e9e5eee8 | 1010 | len += cp->pe->show_pe_data(cp, pe_data + len); |
a3c918ac SH |
1011 | } |
1012 | pe_data[len] = '\0'; | |
1da177e4 | 1013 | |
667a5f18 VB |
1014 | #ifdef CONFIG_IP_VS_IPV6 |
1015 | if (cp->af == AF_INET6) | |
a3c918ac SH |
1016 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X " |
1017 | "%pI6 %04X %-11s %7lu%s\n", | |
667a5f18 | 1018 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
1019 | &cp->caddr.in6, ntohs(cp->cport), |
1020 | &cp->vaddr.in6, ntohs(cp->vport), | |
1021 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 | 1022 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 1023 | (cp->timer.expires-jiffies)/HZ, pe_data); |
667a5f18 VB |
1024 | else |
1025 | #endif | |
1026 | seq_printf(seq, | |
1027 | "%-3s %08X %04X %08X %04X" | |
a3c918ac | 1028 | " %08X %04X %-11s %7lu%s\n", |
1da177e4 | 1029 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
1030 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
1031 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
1032 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
1da177e4 | 1033 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 1034 | (cp->timer.expires-jiffies)/HZ, pe_data); |
1da177e4 LT |
1035 | } |
1036 | return 0; | |
1037 | } | |
1038 | ||
56b3d975 | 1039 | static const struct seq_operations ip_vs_conn_seq_ops = { |
1da177e4 LT |
1040 | .start = ip_vs_conn_seq_start, |
1041 | .next = ip_vs_conn_seq_next, | |
1042 | .stop = ip_vs_conn_seq_stop, | |
1043 | .show = ip_vs_conn_seq_show, | |
1044 | }; | |
1045 | ||
1046 | static int ip_vs_conn_open(struct inode *inode, struct file *file) | |
1047 | { | |
6e67e586 HS |
1048 | return seq_open_net(inode, file, &ip_vs_conn_seq_ops, |
1049 | sizeof(struct ip_vs_iter_state)); | |
1da177e4 LT |
1050 | } |
1051 | ||
9a32144e | 1052 | static const struct file_operations ip_vs_conn_fops = { |
1da177e4 LT |
1053 | .owner = THIS_MODULE, |
1054 | .open = ip_vs_conn_open, | |
1055 | .read = seq_read, | |
1056 | .llseek = seq_lseek, | |
0f08190f | 1057 | .release = seq_release_net, |
1da177e4 | 1058 | }; |
7a4fbb1f | 1059 | |
95c96174 | 1060 | static const char *ip_vs_origin_name(unsigned int flags) |
7a4fbb1f RB |
1061 | { |
1062 | if (flags & IP_VS_CONN_F_SYNC) | |
1063 | return "SYNC"; | |
1064 | else | |
1065 | return "LOCAL"; | |
1066 | } | |
1067 | ||
1068 | static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) | |
1069 | { | |
1070 | ||
1071 | if (v == SEQ_START_TOKEN) | |
1072 | seq_puts(seq, | |
1073 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); | |
1074 | else { | |
1075 | const struct ip_vs_conn *cp = v; | |
6e67e586 HS |
1076 | struct net *net = seq_file_net(seq); |
1077 | ||
1078 | if (!ip_vs_conn_net_eq(cp, net)) | |
1079 | return 0; | |
7a4fbb1f | 1080 | |
667a5f18 VB |
1081 | #ifdef CONFIG_IP_VS_IPV6 |
1082 | if (cp->af == AF_INET6) | |
5b095d98 | 1083 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n", |
667a5f18 | 1084 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
1085 | &cp->caddr.in6, ntohs(cp->cport), |
1086 | &cp->vaddr.in6, ntohs(cp->vport), | |
1087 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 VB |
1088 | ip_vs_state_name(cp->protocol, cp->state), |
1089 | ip_vs_origin_name(cp->flags), | |
1090 | (cp->timer.expires-jiffies)/HZ); | |
1091 | else | |
1092 | #endif | |
1093 | seq_printf(seq, | |
1094 | "%-3s %08X %04X %08X %04X " | |
1095 | "%08X %04X %-11s %-6s %7lu\n", | |
7a4fbb1f | 1096 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
1097 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
1098 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
1099 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
7a4fbb1f RB |
1100 | ip_vs_state_name(cp->protocol, cp->state), |
1101 | ip_vs_origin_name(cp->flags), | |
1102 | (cp->timer.expires-jiffies)/HZ); | |
1103 | } | |
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | static const struct seq_operations ip_vs_conn_sync_seq_ops = { | |
1108 | .start = ip_vs_conn_seq_start, | |
1109 | .next = ip_vs_conn_seq_next, | |
1110 | .stop = ip_vs_conn_seq_stop, | |
1111 | .show = ip_vs_conn_sync_seq_show, | |
1112 | }; | |
1113 | ||
1114 | static int ip_vs_conn_sync_open(struct inode *inode, struct file *file) | |
1115 | { | |
6e67e586 HS |
1116 | return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops, |
1117 | sizeof(struct ip_vs_iter_state)); | |
7a4fbb1f RB |
1118 | } |
1119 | ||
1120 | static const struct file_operations ip_vs_conn_sync_fops = { | |
1121 | .owner = THIS_MODULE, | |
1122 | .open = ip_vs_conn_sync_open, | |
1123 | .read = seq_read, | |
1124 | .llseek = seq_lseek, | |
0f08190f | 1125 | .release = seq_release_net, |
7a4fbb1f RB |
1126 | }; |
1127 | ||
1da177e4 LT |
1128 | #endif |
1129 | ||
1130 | ||
1131 | /* | |
1132 | * Randomly drop connection entries before running out of memory | |
1133 | */ | |
1134 | static inline int todrop_entry(struct ip_vs_conn *cp) | |
1135 | { | |
1136 | /* | |
1137 | * The drop rate array needs tuning for real environments. | |
1138 | * Called from timer bh only => no locking | |
1139 | */ | |
9b5b5cff | 1140 | static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; |
1da177e4 LT |
1141 | static char todrop_counter[9] = {0}; |
1142 | int i; | |
1143 | ||
1144 | /* if the conn entry hasn't lasted for 60 seconds, don't drop it. | |
1145 | This will leave enough time for normal connection to get | |
1146 | through. */ | |
1147 | if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) | |
1148 | return 0; | |
1149 | ||
1150 | /* Don't drop the entry if its number of incoming packets is not | |
1151 | located in [0, 8] */ | |
1152 | i = atomic_read(&cp->in_pkts); | |
1153 | if (i > 8 || i < 0) return 0; | |
1154 | ||
1155 | if (!todrop_rate[i]) return 0; | |
1156 | if (--todrop_counter[i] > 0) return 0; | |
1157 | ||
1158 | todrop_counter[i] = todrop_rate[i]; | |
1159 | return 1; | |
1160 | } | |
1161 | ||
af9debd4 | 1162 | /* Called from keventd and must protect itself from softirqs */ |
f6340ee0 | 1163 | void ip_vs_random_dropentry(struct net *net) |
1da177e4 LT |
1164 | { |
1165 | int idx; | |
1166 | struct ip_vs_conn *cp; | |
1da177e4 LT |
1167 | |
1168 | /* | |
1169 | * Randomly scan 1/32 of the whole table every second | |
1170 | */ | |
6f7edb48 | 1171 | for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) { |
95c96174 | 1172 | unsigned int hash = net_random() & ip_vs_conn_tab_mask; |
731109e7 | 1173 | struct hlist_node *n; |
1da177e4 LT |
1174 | |
1175 | /* | |
1176 | * Lock is actually needed in this loop. | |
1177 | */ | |
af9debd4 | 1178 | ct_write_lock_bh(hash); |
1da177e4 | 1179 | |
731109e7 | 1180 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) { |
87375ab4 | 1181 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) |
1da177e4 LT |
1182 | /* connection template */ |
1183 | continue; | |
f6340ee0 HS |
1184 | if (!ip_vs_conn_net_eq(cp, net)) |
1185 | continue; | |
1da177e4 LT |
1186 | if (cp->protocol == IPPROTO_TCP) { |
1187 | switch(cp->state) { | |
1188 | case IP_VS_TCP_S_SYN_RECV: | |
1189 | case IP_VS_TCP_S_SYNACK: | |
1190 | break; | |
1191 | ||
1192 | case IP_VS_TCP_S_ESTABLISHED: | |
1193 | if (todrop_entry(cp)) | |
1194 | break; | |
1195 | continue; | |
1196 | ||
1197 | default: | |
1198 | continue; | |
1199 | } | |
1200 | } else { | |
1201 | if (!todrop_entry(cp)) | |
1202 | continue; | |
1203 | } | |
1204 | ||
1da177e4 LT |
1205 | IP_VS_DBG(4, "del connection\n"); |
1206 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1207 | if (cp->control) { |
1da177e4 | 1208 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1209 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1210 | } |
1da177e4 | 1211 | } |
af9debd4 | 1212 | ct_write_unlock_bh(hash); |
1da177e4 LT |
1213 | } |
1214 | } | |
1215 | ||
1216 | ||
1217 | /* | |
1218 | * Flush all the connection entries in the ip_vs_conn_tab | |
1219 | */ | |
6e67e586 | 1220 | static void ip_vs_conn_flush(struct net *net) |
1da177e4 LT |
1221 | { |
1222 | int idx; | |
1223 | struct ip_vs_conn *cp; | |
6e67e586 | 1224 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 | 1225 | |
a0840e2e | 1226 | flush_again: |
6f7edb48 | 1227 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
731109e7 CG |
1228 | struct hlist_node *n; |
1229 | ||
1da177e4 LT |
1230 | /* |
1231 | * Lock is actually needed in this loop. | |
1232 | */ | |
1233 | ct_write_lock_bh(idx); | |
1234 | ||
731109e7 | 1235 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) { |
6e67e586 HS |
1236 | if (!ip_vs_conn_net_eq(cp, net)) |
1237 | continue; | |
1da177e4 LT |
1238 | IP_VS_DBG(4, "del connection\n"); |
1239 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1240 | if (cp->control) { |
1da177e4 | 1241 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1242 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1243 | } |
1da177e4 LT |
1244 | } |
1245 | ct_write_unlock_bh(idx); | |
1246 | } | |
1247 | ||
1248 | /* the counter may be not NULL, because maybe some conn entries | |
1249 | are run by slow timer handler or unhashed but still referred */ | |
6e67e586 | 1250 | if (atomic_read(&ipvs->conn_count) != 0) { |
1da177e4 LT |
1251 | schedule(); |
1252 | goto flush_again; | |
1253 | } | |
1254 | } | |
61b1ab45 HS |
1255 | /* |
1256 | * per netns init and exit | |
1257 | */ | |
503cf15a | 1258 | int __net_init ip_vs_conn_net_init(struct net *net) |
61b1ab45 | 1259 | { |
6e67e586 HS |
1260 | struct netns_ipvs *ipvs = net_ipvs(net); |
1261 | ||
6e67e586 | 1262 | atomic_set(&ipvs->conn_count, 0); |
1da177e4 | 1263 | |
61b1ab45 HS |
1264 | proc_net_fops_create(net, "ip_vs_conn", 0, &ip_vs_conn_fops); |
1265 | proc_net_fops_create(net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops); | |
1266 | return 0; | |
1267 | } | |
1268 | ||
503cf15a | 1269 | void __net_exit ip_vs_conn_net_cleanup(struct net *net) |
61b1ab45 | 1270 | { |
6e67e586 HS |
1271 | /* flush all the connection entries first */ |
1272 | ip_vs_conn_flush(net); | |
61b1ab45 HS |
1273 | proc_net_remove(net, "ip_vs_conn"); |
1274 | proc_net_remove(net, "ip_vs_conn_sync"); | |
1275 | } | |
1da177e4 | 1276 | |
048cf48b | 1277 | int __init ip_vs_conn_init(void) |
1da177e4 LT |
1278 | { |
1279 | int idx; | |
1280 | ||
6f7edb48 CB |
1281 | /* Compute size and mask */ |
1282 | ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits; | |
1283 | ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1; | |
1284 | ||
1da177e4 LT |
1285 | /* |
1286 | * Allocate the connection hash table and initialize its list heads | |
1287 | */ | |
731109e7 | 1288 | ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab)); |
1da177e4 LT |
1289 | if (!ip_vs_conn_tab) |
1290 | return -ENOMEM; | |
1291 | ||
1292 | /* Allocate ip_vs_conn slab cache */ | |
1293 | ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", | |
1294 | sizeof(struct ip_vs_conn), 0, | |
20c2df83 | 1295 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1296 | if (!ip_vs_conn_cachep) { |
1297 | vfree(ip_vs_conn_tab); | |
1298 | return -ENOMEM; | |
1299 | } | |
1300 | ||
1e3e238e HE |
1301 | pr_info("Connection hash table configured " |
1302 | "(size=%d, memory=%ldKbytes)\n", | |
6f7edb48 CB |
1303 | ip_vs_conn_tab_size, |
1304 | (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024); | |
1da177e4 LT |
1305 | IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n", |
1306 | sizeof(struct ip_vs_conn)); | |
1307 | ||
731109e7 CG |
1308 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) |
1309 | INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]); | |
1da177e4 LT |
1310 | |
1311 | for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { | |
1312 | rwlock_init(&__ip_vs_conntbl_lock_array[idx].l); | |
1313 | } | |
1314 | ||
1da177e4 LT |
1315 | /* calculate the random value for connection hash */ |
1316 | get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); | |
1317 | ||
7a4f0761 | 1318 | return 0; |
1da177e4 LT |
1319 | } |
1320 | ||
1da177e4 LT |
1321 | void ip_vs_conn_cleanup(void) |
1322 | { | |
1da177e4 LT |
1323 | /* Release the empty cache */ |
1324 | kmem_cache_destroy(ip_vs_conn_cachep); | |
1da177e4 LT |
1325 | vfree(ip_vs_conn_tab); |
1326 | } |