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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, | |
d4383f04 | 311 | int inverse, struct ip_vs_conn_param *p) |
f11017ec SH |
312 | { |
313 | __be16 _ports[2], *pptr; | |
6e67e586 | 314 | struct net *net = skb_net(skb); |
f11017ec | 315 | |
d4383f04 | 316 | pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph); |
f11017ec SH |
317 | if (pptr == NULL) |
318 | return 1; | |
319 | ||
320 | if (likely(!inverse)) | |
6e67e586 HS |
321 | ip_vs_conn_fill_param(net, af, iph->protocol, &iph->saddr, |
322 | pptr[0], &iph->daddr, pptr[1], p); | |
f11017ec | 323 | else |
6e67e586 HS |
324 | ip_vs_conn_fill_param(net, af, iph->protocol, &iph->daddr, |
325 | pptr[1], &iph->saddr, pptr[0], p); | |
f11017ec SH |
326 | return 0; |
327 | } | |
328 | ||
5c0d2374 SH |
329 | struct ip_vs_conn * |
330 | ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb, | |
d4383f04 | 331 | const struct ip_vs_iphdr *iph, int inverse) |
5c0d2374 | 332 | { |
f11017ec | 333 | struct ip_vs_conn_param p; |
5c0d2374 | 334 | |
d4383f04 | 335 | if (ip_vs_conn_fill_param_proto(af, skb, iph, inverse, &p)) |
5c0d2374 SH |
336 | return NULL; |
337 | ||
f11017ec | 338 | return ip_vs_conn_in_get(&p); |
5c0d2374 SH |
339 | } |
340 | EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto); | |
341 | ||
87375ab4 | 342 | /* Get reference to connection template */ |
f11017ec | 343 | struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p) |
87375ab4 | 344 | { |
95c96174 | 345 | unsigned int hash; |
87375ab4 | 346 | struct ip_vs_conn *cp; |
731109e7 | 347 | struct hlist_node *n; |
87375ab4 | 348 | |
85999283 | 349 | hash = ip_vs_conn_hashkey_param(p, false); |
87375ab4 JA |
350 | |
351 | ct_read_lock(hash); | |
352 | ||
731109e7 | 353 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) { |
6e67e586 HS |
354 | if (!ip_vs_conn_net_eq(cp, p->net)) |
355 | continue; | |
f71499aa | 356 | if (p->pe_data && p->pe->ct_match) { |
ea2c73af | 357 | if (p->pe == cp->pe && p->pe->ct_match(p, cp)) |
85999283 SH |
358 | goto out; |
359 | continue; | |
360 | } | |
361 | ||
f11017ec SH |
362 | if (cp->af == p->af && |
363 | ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && | |
be8be9ec | 364 | /* protocol should only be IPPROTO_IP if |
f11017ec SH |
365 | * p->vaddr is a fwmark */ |
366 | ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC : | |
367 | p->af, p->vaddr, &cp->vaddr) && | |
368 | p->cport == cp->cport && p->vport == cp->vport && | |
87375ab4 | 369 | cp->flags & IP_VS_CONN_F_TEMPLATE && |
85999283 | 370 | p->protocol == cp->protocol) |
87375ab4 | 371 | goto out; |
87375ab4 JA |
372 | } |
373 | cp = NULL; | |
374 | ||
375 | out: | |
85999283 SH |
376 | if (cp) |
377 | atomic_inc(&cp->refcnt); | |
87375ab4 JA |
378 | ct_read_unlock(hash); |
379 | ||
28364a59 | 380 | IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n", |
f11017ec SH |
381 | ip_vs_proto_name(p->protocol), |
382 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
383 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 384 | cp ? "hit" : "not hit"); |
87375ab4 JA |
385 | |
386 | return cp; | |
387 | } | |
1da177e4 | 388 | |
f11017ec SH |
389 | /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. |
390 | * Called for pkts coming from inside-to-OUTside. | |
391 | * p->caddr, p->cport: pkt source address (inside host) | |
392 | * p->vaddr, p->vport: pkt dest address (foreign host) */ | |
393 | struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p) | |
1da177e4 | 394 | { |
95c96174 | 395 | unsigned int hash; |
1da177e4 | 396 | struct ip_vs_conn *cp, *ret=NULL; |
731109e7 | 397 | struct hlist_node *n; |
1da177e4 LT |
398 | |
399 | /* | |
400 | * Check for "full" addressed entries | |
401 | */ | |
85999283 | 402 | hash = ip_vs_conn_hashkey_param(p, true); |
1da177e4 LT |
403 | |
404 | ct_read_lock(hash); | |
405 | ||
731109e7 | 406 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) { |
f11017ec | 407 | if (cp->af == p->af && |
6e67e586 | 408 | p->vport == cp->cport && p->cport == cp->dport && |
f11017ec SH |
409 | ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) && |
410 | ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) && | |
6e67e586 HS |
411 | p->protocol == cp->protocol && |
412 | ip_vs_conn_net_eq(cp, p->net)) { | |
1da177e4 LT |
413 | /* HIT */ |
414 | atomic_inc(&cp->refcnt); | |
415 | ret = cp; | |
416 | break; | |
417 | } | |
418 | } | |
419 | ||
420 | ct_read_unlock(hash); | |
421 | ||
28364a59 | 422 | IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n", |
f11017ec SH |
423 | ip_vs_proto_name(p->protocol), |
424 | IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), | |
425 | IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), | |
28364a59 | 426 | ret ? "hit" : "not hit"); |
1da177e4 LT |
427 | |
428 | return ret; | |
429 | } | |
430 | ||
5c0d2374 SH |
431 | struct ip_vs_conn * |
432 | ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, | |
d4383f04 | 433 | const struct ip_vs_iphdr *iph, int inverse) |
5c0d2374 | 434 | { |
f11017ec | 435 | struct ip_vs_conn_param p; |
5c0d2374 | 436 | |
d4383f04 | 437 | if (ip_vs_conn_fill_param_proto(af, skb, iph, inverse, &p)) |
5c0d2374 SH |
438 | return NULL; |
439 | ||
f11017ec | 440 | return ip_vs_conn_out_get(&p); |
5c0d2374 SH |
441 | } |
442 | EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto); | |
1da177e4 LT |
443 | |
444 | /* | |
445 | * Put back the conn and restart its timer with its timeout | |
446 | */ | |
447 | void ip_vs_conn_put(struct ip_vs_conn *cp) | |
448 | { | |
26ec037f NC |
449 | unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ? |
450 | 0 : cp->timeout; | |
451 | mod_timer(&cp->timer, jiffies+t); | |
1da177e4 LT |
452 | |
453 | __ip_vs_conn_put(cp); | |
454 | } | |
455 | ||
456 | ||
457 | /* | |
458 | * Fill a no_client_port connection with a client port number | |
459 | */ | |
014d730d | 460 | void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) |
1da177e4 LT |
461 | { |
462 | if (ip_vs_conn_unhash(cp)) { | |
463 | spin_lock(&cp->lock); | |
464 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) { | |
465 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
466 | cp->flags &= ~IP_VS_CONN_F_NO_CPORT; | |
467 | cp->cport = cport; | |
468 | } | |
469 | spin_unlock(&cp->lock); | |
470 | ||
471 | /* hash on new dport */ | |
472 | ip_vs_conn_hash(cp); | |
473 | } | |
474 | } | |
475 | ||
476 | ||
477 | /* | |
478 | * Bind a connection entry with the corresponding packet_xmit. | |
479 | * Called by ip_vs_conn_new. | |
480 | */ | |
481 | static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) | |
482 | { | |
483 | switch (IP_VS_FWD_METHOD(cp)) { | |
484 | case IP_VS_CONN_F_MASQ: | |
485 | cp->packet_xmit = ip_vs_nat_xmit; | |
486 | break; | |
487 | ||
488 | case IP_VS_CONN_F_TUNNEL: | |
489 | cp->packet_xmit = ip_vs_tunnel_xmit; | |
490 | break; | |
491 | ||
492 | case IP_VS_CONN_F_DROUTE: | |
493 | cp->packet_xmit = ip_vs_dr_xmit; | |
494 | break; | |
495 | ||
496 | case IP_VS_CONN_F_LOCALNODE: | |
497 | cp->packet_xmit = ip_vs_null_xmit; | |
498 | break; | |
499 | ||
500 | case IP_VS_CONN_F_BYPASS: | |
501 | cp->packet_xmit = ip_vs_bypass_xmit; | |
502 | break; | |
503 | } | |
504 | } | |
505 | ||
b3cdd2a7 JV |
506 | #ifdef CONFIG_IP_VS_IPV6 |
507 | static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp) | |
508 | { | |
509 | switch (IP_VS_FWD_METHOD(cp)) { | |
510 | case IP_VS_CONN_F_MASQ: | |
511 | cp->packet_xmit = ip_vs_nat_xmit_v6; | |
512 | break; | |
513 | ||
514 | case IP_VS_CONN_F_TUNNEL: | |
515 | cp->packet_xmit = ip_vs_tunnel_xmit_v6; | |
516 | break; | |
517 | ||
518 | case IP_VS_CONN_F_DROUTE: | |
519 | cp->packet_xmit = ip_vs_dr_xmit_v6; | |
520 | break; | |
521 | ||
522 | case IP_VS_CONN_F_LOCALNODE: | |
523 | cp->packet_xmit = ip_vs_null_xmit; | |
524 | break; | |
525 | ||
526 | case IP_VS_CONN_F_BYPASS: | |
527 | cp->packet_xmit = ip_vs_bypass_xmit_v6; | |
528 | break; | |
529 | } | |
530 | } | |
531 | #endif | |
532 | ||
1da177e4 LT |
533 | |
534 | static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) | |
535 | { | |
536 | return atomic_read(&dest->activeconns) | |
537 | + atomic_read(&dest->inactconns); | |
538 | } | |
539 | ||
540 | /* | |
541 | * Bind a connection entry with a virtual service destination | |
542 | * Called just after a new connection entry is created. | |
543 | */ | |
544 | static inline void | |
545 | ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) | |
546 | { | |
3575792e | 547 | unsigned int conn_flags; |
6b324dbf | 548 | __u32 flags; |
3575792e | 549 | |
1da177e4 LT |
550 | /* if dest is NULL, then return directly */ |
551 | if (!dest) | |
552 | return; | |
553 | ||
554 | /* Increase the refcnt counter of the dest */ | |
555 | atomic_inc(&dest->refcnt); | |
556 | ||
3575792e JA |
557 | conn_flags = atomic_read(&dest->conn_flags); |
558 | if (cp->protocol != IPPROTO_UDP) | |
559 | conn_flags &= ~IP_VS_CONN_F_ONE_PACKET; | |
6b324dbf | 560 | flags = cp->flags; |
1da177e4 | 561 | /* Bind with the destination and its corresponding transmitter */ |
6b324dbf | 562 | if (flags & IP_VS_CONN_F_SYNC) { |
b209639e RB |
563 | /* if the connection is not template and is created |
564 | * by sync, preserve the activity flag. | |
565 | */ | |
6b324dbf | 566 | if (!(flags & IP_VS_CONN_F_TEMPLATE)) |
3575792e | 567 | conn_flags &= ~IP_VS_CONN_F_INACTIVE; |
3233759b | 568 | /* connections inherit forwarding method from dest */ |
6b324dbf | 569 | flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT); |
3575792e | 570 | } |
6b324dbf PNA |
571 | flags |= conn_flags; |
572 | cp->flags = 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 */ | |
6b324dbf | 587 | if (!(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 | */ | |
6b324dbf | 592 | if (!(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 | ||
882a844b JA |
616 | dest = ip_vs_find_dest(ip_vs_conn_net(cp), cp->af, &cp->daddr, |
617 | cp->dport, &cp->vaddr, cp->vport, | |
618 | cp->protocol, cp->fwmark, cp->flags); | |
619 | if (dest) { | |
620 | struct ip_vs_proto_data *pd; | |
621 | ||
f73181c8 PNA |
622 | spin_lock(&cp->lock); |
623 | if (cp->dest) { | |
624 | spin_unlock(&cp->lock); | |
625 | return dest; | |
626 | } | |
627 | ||
882a844b JA |
628 | /* Applications work depending on the forwarding method |
629 | * but better to reassign them always when binding dest */ | |
630 | if (cp->app) | |
631 | ip_vs_unbind_app(cp); | |
632 | ||
1e356f9c | 633 | ip_vs_bind_dest(cp, dest); |
f73181c8 | 634 | spin_unlock(&cp->lock); |
882a844b JA |
635 | |
636 | /* Update its packet transmitter */ | |
637 | cp->packet_xmit = NULL; | |
638 | #ifdef CONFIG_IP_VS_IPV6 | |
639 | if (cp->af == AF_INET6) | |
640 | ip_vs_bind_xmit_v6(cp); | |
641 | else | |
642 | #endif | |
643 | ip_vs_bind_xmit(cp); | |
644 | ||
645 | pd = ip_vs_proto_data_get(ip_vs_conn_net(cp), cp->protocol); | |
646 | if (pd && atomic_read(&pd->appcnt)) | |
647 | ip_vs_bind_app(cp, pd->pp); | |
648 | } | |
649 | return dest; | |
1e356f9c | 650 | } |
1e356f9c RB |
651 | |
652 | ||
1da177e4 LT |
653 | /* |
654 | * Unbind a connection entry with its VS destination | |
655 | * Called by the ip_vs_conn_expire function. | |
656 | */ | |
657 | static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) | |
658 | { | |
659 | struct ip_vs_dest *dest = cp->dest; | |
660 | ||
661 | if (!dest) | |
662 | return; | |
663 | ||
cfc78c5a JV |
664 | IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d " |
665 | "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " | |
666 | "dest->refcnt:%d\n", | |
667 | ip_vs_proto_name(cp->protocol), | |
668 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), | |
669 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), | |
670 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport), | |
671 | ip_vs_fwd_tag(cp), cp->state, | |
672 | cp->flags, atomic_read(&cp->refcnt), | |
673 | atomic_read(&dest->refcnt)); | |
1da177e4 LT |
674 | |
675 | /* Update the connection counters */ | |
87375ab4 | 676 | if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { |
1da177e4 LT |
677 | /* It is a normal connection, so decrease the inactconns |
678 | or activeconns counter */ | |
679 | if (cp->flags & IP_VS_CONN_F_INACTIVE) { | |
680 | atomic_dec(&dest->inactconns); | |
681 | } else { | |
682 | atomic_dec(&dest->activeconns); | |
683 | } | |
684 | } else { | |
685 | /* It is a persistent connection/template, so decrease | |
25985edc | 686 | the persistent connection counter */ |
1da177e4 LT |
687 | atomic_dec(&dest->persistconns); |
688 | } | |
689 | ||
690 | if (dest->l_threshold != 0) { | |
691 | if (ip_vs_dest_totalconns(dest) < dest->l_threshold) | |
692 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
693 | } else if (dest->u_threshold != 0) { | |
694 | if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) | |
695 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
696 | } else { | |
697 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
698 | dest->flags &= ~IP_VS_DEST_F_OVERLOAD; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Simply decrease the refcnt of the dest, because the | |
703 | * dest will be either in service's destination list | |
704 | * or in the trash. | |
705 | */ | |
706 | atomic_dec(&dest->refcnt); | |
707 | } | |
708 | ||
8e1b0b1b SH |
709 | static int expire_quiescent_template(struct netns_ipvs *ipvs, |
710 | struct ip_vs_dest *dest) | |
711 | { | |
712 | #ifdef CONFIG_SYSCTL | |
713 | return ipvs->sysctl_expire_quiescent_template && | |
714 | (atomic_read(&dest->weight) == 0); | |
715 | #else | |
716 | return 0; | |
717 | #endif | |
718 | } | |
1da177e4 LT |
719 | |
720 | /* | |
721 | * Checking if the destination of a connection template is available. | |
722 | * If available, return 1, otherwise invalidate this connection | |
723 | * template and return 0. | |
724 | */ | |
725 | int ip_vs_check_template(struct ip_vs_conn *ct) | |
726 | { | |
727 | struct ip_vs_dest *dest = ct->dest; | |
a0840e2e | 728 | struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(ct)); |
1da177e4 LT |
729 | |
730 | /* | |
731 | * Checking the dest server status. | |
732 | */ | |
733 | if ((dest == NULL) || | |
e905a9ed | 734 | !(dest->flags & IP_VS_DEST_F_AVAILABLE) || |
8e1b0b1b | 735 | expire_quiescent_template(ipvs, dest)) { |
cfc78c5a JV |
736 | IP_VS_DBG_BUF(9, "check_template: dest not available for " |
737 | "protocol %s s:%s:%d v:%s:%d " | |
738 | "-> d:%s:%d\n", | |
739 | ip_vs_proto_name(ct->protocol), | |
740 | IP_VS_DBG_ADDR(ct->af, &ct->caddr), | |
741 | ntohs(ct->cport), | |
742 | IP_VS_DBG_ADDR(ct->af, &ct->vaddr), | |
743 | ntohs(ct->vport), | |
744 | IP_VS_DBG_ADDR(ct->af, &ct->daddr), | |
745 | ntohs(ct->dport)); | |
1da177e4 LT |
746 | |
747 | /* | |
748 | * Invalidate the connection template | |
749 | */ | |
014d730d | 750 | if (ct->vport != htons(0xffff)) { |
1da177e4 | 751 | if (ip_vs_conn_unhash(ct)) { |
014d730d AV |
752 | ct->dport = htons(0xffff); |
753 | ct->vport = htons(0xffff); | |
1da177e4 LT |
754 | ct->cport = 0; |
755 | ip_vs_conn_hash(ct); | |
756 | } | |
757 | } | |
758 | ||
759 | /* | |
760 | * Simply decrease the refcnt of the template, | |
761 | * don't restart its timer. | |
762 | */ | |
763 | atomic_dec(&ct->refcnt); | |
764 | return 0; | |
765 | } | |
766 | return 1; | |
767 | } | |
768 | ||
769 | static void ip_vs_conn_expire(unsigned long data) | |
770 | { | |
771 | struct ip_vs_conn *cp = (struct ip_vs_conn *)data; | |
749c42b6 JA |
772 | struct net *net = ip_vs_conn_net(cp); |
773 | struct netns_ipvs *ipvs = net_ipvs(net); | |
1da177e4 LT |
774 | |
775 | cp->timeout = 60*HZ; | |
776 | ||
777 | /* | |
778 | * hey, I'm using it | |
779 | */ | |
780 | atomic_inc(&cp->refcnt); | |
781 | ||
782 | /* | |
783 | * do I control anybody? | |
784 | */ | |
785 | if (atomic_read(&cp->n_control)) | |
786 | goto expire_later; | |
787 | ||
788 | /* | |
789 | * unhash it if it is hashed in the conn table | |
790 | */ | |
26ec037f | 791 | if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET)) |
1da177e4 LT |
792 | goto expire_later; |
793 | ||
794 | /* | |
795 | * refcnt==1 implies I'm the only one referrer | |
796 | */ | |
797 | if (likely(atomic_read(&cp->refcnt) == 1)) { | |
798 | /* delete the timer if it is activated by other users */ | |
799 | if (timer_pending(&cp->timer)) | |
800 | del_timer(&cp->timer); | |
801 | ||
802 | /* does anybody control me? */ | |
803 | if (cp->control) | |
804 | ip_vs_control_del(cp); | |
805 | ||
8f4e0a18 | 806 | if (cp->flags & IP_VS_CONN_F_NFCT) { |
f4bc17cd | 807 | ip_vs_conn_drop_conntrack(cp); |
8f4e0a18 HS |
808 | /* Do not access conntracks during subsys cleanup |
809 | * because nf_conntrack_find_get can not be used after | |
810 | * conntrack cleanup for the net. | |
811 | */ | |
812 | smp_rmb(); | |
813 | if (ipvs->enable) | |
814 | ip_vs_conn_drop_conntrack(cp); | |
815 | } | |
f4bc17cd | 816 | |
e9e5eee8 | 817 | ip_vs_pe_put(cp->pe); |
85999283 | 818 | kfree(cp->pe_data); |
1da177e4 LT |
819 | if (unlikely(cp->app != NULL)) |
820 | ip_vs_unbind_app(cp); | |
821 | ip_vs_unbind_dest(cp); | |
822 | if (cp->flags & IP_VS_CONN_F_NO_CPORT) | |
823 | atomic_dec(&ip_vs_conn_no_cport_cnt); | |
6e67e586 | 824 | atomic_dec(&ipvs->conn_count); |
1da177e4 LT |
825 | |
826 | kmem_cache_free(ip_vs_conn_cachep, cp); | |
827 | return; | |
828 | } | |
829 | ||
830 | /* hash it back to the table */ | |
831 | ip_vs_conn_hash(cp); | |
832 | ||
833 | expire_later: | |
4b5bdf5c | 834 | IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n", |
1da177e4 LT |
835 | atomic_read(&cp->refcnt)-1, |
836 | atomic_read(&cp->n_control)); | |
837 | ||
749c42b6 JA |
838 | if (ipvs->sync_state & IP_VS_STATE_MASTER) |
839 | ip_vs_sync_conn(net, cp, sysctl_sync_threshold(ipvs)); | |
840 | ||
1da177e4 LT |
841 | ip_vs_conn_put(cp); |
842 | } | |
843 | ||
844 | ||
845 | void ip_vs_conn_expire_now(struct ip_vs_conn *cp) | |
846 | { | |
847 | if (del_timer(&cp->timer)) | |
848 | mod_timer(&cp->timer, jiffies); | |
1da177e4 LT |
849 | } |
850 | ||
851 | ||
852 | /* | |
853 | * Create a new connection entry and hash it into the ip_vs_conn_tab | |
854 | */ | |
855 | struct ip_vs_conn * | |
f11017ec | 856 | ip_vs_conn_new(const struct ip_vs_conn_param *p, |
95c96174 | 857 | const union nf_inet_addr *daddr, __be16 dport, unsigned int flags, |
0e051e68 | 858 | struct ip_vs_dest *dest, __u32 fwmark) |
1da177e4 LT |
859 | { |
860 | struct ip_vs_conn *cp; | |
6e67e586 HS |
861 | struct netns_ipvs *ipvs = net_ipvs(p->net); |
862 | struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net, | |
863 | p->protocol); | |
1da177e4 | 864 | |
c3762229 | 865 | cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC); |
1da177e4 | 866 | if (cp == NULL) { |
1e3e238e | 867 | IP_VS_ERR_RL("%s(): no memory\n", __func__); |
1da177e4 LT |
868 | return NULL; |
869 | } | |
870 | ||
731109e7 | 871 | INIT_HLIST_NODE(&cp->c_list); |
b24b8a24 | 872 | setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp); |
6e67e586 | 873 | ip_vs_conn_net_set(cp, p->net); |
f11017ec SH |
874 | cp->af = p->af; |
875 | cp->protocol = p->protocol; | |
876 | ip_vs_addr_copy(p->af, &cp->caddr, p->caddr); | |
877 | cp->cport = p->cport; | |
878 | ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr); | |
879 | cp->vport = p->vport; | |
be8be9ec | 880 | /* proto should only be IPPROTO_IP if d_addr is a fwmark */ |
f11017ec | 881 | ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af, |
be8be9ec | 882 | &cp->daddr, daddr); |
1da177e4 LT |
883 | cp->dport = dport; |
884 | cp->flags = flags; | |
0e051e68 | 885 | cp->fwmark = fwmark; |
e9e5eee8 SH |
886 | if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) { |
887 | ip_vs_pe_get(p->pe); | |
888 | cp->pe = p->pe; | |
85999283 SH |
889 | cp->pe_data = p->pe_data; |
890 | cp->pe_data_len = p->pe_data_len; | |
891 | } | |
1da177e4 LT |
892 | spin_lock_init(&cp->lock); |
893 | ||
894 | /* | |
895 | * Set the entry is referenced by the current thread before hashing | |
896 | * it in the table, so that other thread run ip_vs_random_dropentry | |
897 | * but cannot drop this entry. | |
898 | */ | |
899 | atomic_set(&cp->refcnt, 1); | |
900 | ||
901 | atomic_set(&cp->n_control, 0); | |
902 | atomic_set(&cp->in_pkts, 0); | |
903 | ||
6e67e586 | 904 | atomic_inc(&ipvs->conn_count); |
1da177e4 LT |
905 | if (flags & IP_VS_CONN_F_NO_CPORT) |
906 | atomic_inc(&ip_vs_conn_no_cport_cnt); | |
907 | ||
908 | /* Bind the connection with a destination server */ | |
909 | ip_vs_bind_dest(cp, dest); | |
910 | ||
911 | /* Set its state and timeout */ | |
912 | cp->state = 0; | |
913 | cp->timeout = 3*HZ; | |
749c42b6 | 914 | cp->sync_endtime = jiffies & ~3UL; |
1da177e4 LT |
915 | |
916 | /* Bind its packet transmitter */ | |
b3cdd2a7 | 917 | #ifdef CONFIG_IP_VS_IPV6 |
f11017ec | 918 | if (p->af == AF_INET6) |
b3cdd2a7 JV |
919 | ip_vs_bind_xmit_v6(cp); |
920 | else | |
921 | #endif | |
922 | ip_vs_bind_xmit(cp); | |
1da177e4 | 923 | |
9bbac6a9 HS |
924 | if (unlikely(pd && atomic_read(&pd->appcnt))) |
925 | ip_vs_bind_app(cp, pd->pp); | |
1da177e4 | 926 | |
f4bc17cd JA |
927 | /* |
928 | * Allow conntrack to be preserved. By default, conntrack | |
929 | * is created and destroyed for every packet. | |
930 | * Sometimes keeping conntrack can be useful for | |
931 | * IP_VS_CONN_F_ONE_PACKET too. | |
932 | */ | |
933 | ||
a0840e2e | 934 | if (ip_vs_conntrack_enabled(ipvs)) |
f4bc17cd JA |
935 | cp->flags |= IP_VS_CONN_F_NFCT; |
936 | ||
1da177e4 LT |
937 | /* Hash it in the ip_vs_conn_tab finally */ |
938 | ip_vs_conn_hash(cp); | |
939 | ||
940 | return cp; | |
941 | } | |
942 | ||
1da177e4 LT |
943 | /* |
944 | * /proc/net/ip_vs_conn entries | |
945 | */ | |
946 | #ifdef CONFIG_PROC_FS | |
6e67e586 | 947 | struct ip_vs_iter_state { |
731109e7 CG |
948 | struct seq_net_private p; |
949 | struct hlist_head *l; | |
6e67e586 | 950 | }; |
1da177e4 LT |
951 | |
952 | static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) | |
953 | { | |
954 | int idx; | |
955 | struct ip_vs_conn *cp; | |
6e67e586 | 956 | struct ip_vs_iter_state *iter = seq->private; |
731109e7 | 957 | struct hlist_node *n; |
e905a9ed | 958 | |
6f7edb48 | 959 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
1da177e4 | 960 | ct_read_lock_bh(idx); |
731109e7 | 961 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) { |
1da177e4 | 962 | if (pos-- == 0) { |
6e67e586 | 963 | iter->l = &ip_vs_conn_tab[idx]; |
731109e7 | 964 | return cp; |
1da177e4 LT |
965 | } |
966 | } | |
967 | ct_read_unlock_bh(idx); | |
968 | } | |
969 | ||
970 | return NULL; | |
971 | } | |
972 | ||
973 | static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) | |
974 | { | |
6e67e586 HS |
975 | struct ip_vs_iter_state *iter = seq->private; |
976 | ||
977 | iter->l = NULL; | |
1da177e4 LT |
978 | return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; |
979 | } | |
980 | ||
981 | static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
982 | { | |
983 | struct ip_vs_conn *cp = v; | |
6e67e586 | 984 | struct ip_vs_iter_state *iter = seq->private; |
731109e7 CG |
985 | struct hlist_node *e; |
986 | struct hlist_head *l = iter->l; | |
1da177e4 LT |
987 | int idx; |
988 | ||
989 | ++*pos; | |
e905a9ed | 990 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
991 | return ip_vs_conn_array(seq, 0); |
992 | ||
993 | /* more on same hash chain? */ | |
731109e7 CG |
994 | if ((e = cp->c_list.next)) |
995 | return hlist_entry(e, struct ip_vs_conn, c_list); | |
1da177e4 LT |
996 | |
997 | idx = l - ip_vs_conn_tab; | |
998 | ct_read_unlock_bh(idx); | |
999 | ||
6f7edb48 | 1000 | while (++idx < ip_vs_conn_tab_size) { |
1da177e4 | 1001 | ct_read_lock_bh(idx); |
731109e7 | 1002 | hlist_for_each_entry(cp, e, &ip_vs_conn_tab[idx], c_list) { |
6e67e586 | 1003 | iter->l = &ip_vs_conn_tab[idx]; |
1da177e4 | 1004 | return cp; |
e905a9ed | 1005 | } |
1da177e4 LT |
1006 | ct_read_unlock_bh(idx); |
1007 | } | |
6e67e586 | 1008 | iter->l = NULL; |
1da177e4 LT |
1009 | return NULL; |
1010 | } | |
1011 | ||
1012 | static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) | |
1013 | { | |
6e67e586 | 1014 | struct ip_vs_iter_state *iter = seq->private; |
731109e7 | 1015 | struct hlist_head *l = iter->l; |
1da177e4 LT |
1016 | |
1017 | if (l) | |
1018 | ct_read_unlock_bh(l - ip_vs_conn_tab); | |
1019 | } | |
1020 | ||
1021 | static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) | |
1022 | { | |
1023 | ||
1024 | if (v == SEQ_START_TOKEN) | |
1025 | seq_puts(seq, | |
a3c918ac | 1026 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n"); |
1da177e4 LT |
1027 | else { |
1028 | const struct ip_vs_conn *cp = v; | |
6e67e586 | 1029 | struct net *net = seq_file_net(seq); |
a3c918ac SH |
1030 | char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3]; |
1031 | size_t len = 0; | |
1032 | ||
6e67e586 HS |
1033 | if (!ip_vs_conn_net_eq(cp, net)) |
1034 | return 0; | |
e9e5eee8 | 1035 | if (cp->pe_data) { |
a3c918ac | 1036 | pe_data[0] = ' '; |
e9e5eee8 SH |
1037 | len = strlen(cp->pe->name); |
1038 | memcpy(pe_data + 1, cp->pe->name, len); | |
a3c918ac SH |
1039 | pe_data[len + 1] = ' '; |
1040 | len += 2; | |
e9e5eee8 | 1041 | len += cp->pe->show_pe_data(cp, pe_data + len); |
a3c918ac SH |
1042 | } |
1043 | pe_data[len] = '\0'; | |
1da177e4 | 1044 | |
667a5f18 VB |
1045 | #ifdef CONFIG_IP_VS_IPV6 |
1046 | if (cp->af == AF_INET6) | |
a3c918ac SH |
1047 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X " |
1048 | "%pI6 %04X %-11s %7lu%s\n", | |
667a5f18 | 1049 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
1050 | &cp->caddr.in6, ntohs(cp->cport), |
1051 | &cp->vaddr.in6, ntohs(cp->vport), | |
1052 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 | 1053 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 1054 | (cp->timer.expires-jiffies)/HZ, pe_data); |
667a5f18 VB |
1055 | else |
1056 | #endif | |
1057 | seq_printf(seq, | |
1058 | "%-3s %08X %04X %08X %04X" | |
a3c918ac | 1059 | " %08X %04X %-11s %7lu%s\n", |
1da177e4 | 1060 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
1061 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
1062 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
1063 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
1da177e4 | 1064 | ip_vs_state_name(cp->protocol, cp->state), |
a3c918ac | 1065 | (cp->timer.expires-jiffies)/HZ, pe_data); |
1da177e4 LT |
1066 | } |
1067 | return 0; | |
1068 | } | |
1069 | ||
56b3d975 | 1070 | static const struct seq_operations ip_vs_conn_seq_ops = { |
1da177e4 LT |
1071 | .start = ip_vs_conn_seq_start, |
1072 | .next = ip_vs_conn_seq_next, | |
1073 | .stop = ip_vs_conn_seq_stop, | |
1074 | .show = ip_vs_conn_seq_show, | |
1075 | }; | |
1076 | ||
1077 | static int ip_vs_conn_open(struct inode *inode, struct file *file) | |
1078 | { | |
6e67e586 HS |
1079 | return seq_open_net(inode, file, &ip_vs_conn_seq_ops, |
1080 | sizeof(struct ip_vs_iter_state)); | |
1da177e4 LT |
1081 | } |
1082 | ||
9a32144e | 1083 | static const struct file_operations ip_vs_conn_fops = { |
1da177e4 LT |
1084 | .owner = THIS_MODULE, |
1085 | .open = ip_vs_conn_open, | |
1086 | .read = seq_read, | |
1087 | .llseek = seq_lseek, | |
0f08190f | 1088 | .release = seq_release_net, |
1da177e4 | 1089 | }; |
7a4fbb1f | 1090 | |
95c96174 | 1091 | static const char *ip_vs_origin_name(unsigned int flags) |
7a4fbb1f RB |
1092 | { |
1093 | if (flags & IP_VS_CONN_F_SYNC) | |
1094 | return "SYNC"; | |
1095 | else | |
1096 | return "LOCAL"; | |
1097 | } | |
1098 | ||
1099 | static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) | |
1100 | { | |
1101 | ||
1102 | if (v == SEQ_START_TOKEN) | |
1103 | seq_puts(seq, | |
1104 | "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); | |
1105 | else { | |
1106 | const struct ip_vs_conn *cp = v; | |
6e67e586 HS |
1107 | struct net *net = seq_file_net(seq); |
1108 | ||
1109 | if (!ip_vs_conn_net_eq(cp, net)) | |
1110 | return 0; | |
7a4fbb1f | 1111 | |
667a5f18 VB |
1112 | #ifdef CONFIG_IP_VS_IPV6 |
1113 | if (cp->af == AF_INET6) | |
5b095d98 | 1114 | seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n", |
667a5f18 | 1115 | ip_vs_proto_name(cp->protocol), |
38ff4fa4 HH |
1116 | &cp->caddr.in6, ntohs(cp->cport), |
1117 | &cp->vaddr.in6, ntohs(cp->vport), | |
1118 | &cp->daddr.in6, ntohs(cp->dport), | |
667a5f18 VB |
1119 | ip_vs_state_name(cp->protocol, cp->state), |
1120 | ip_vs_origin_name(cp->flags), | |
1121 | (cp->timer.expires-jiffies)/HZ); | |
1122 | else | |
1123 | #endif | |
1124 | seq_printf(seq, | |
1125 | "%-3s %08X %04X %08X %04X " | |
1126 | "%08X %04X %-11s %-6s %7lu\n", | |
7a4fbb1f | 1127 | ip_vs_proto_name(cp->protocol), |
e7ade46a JV |
1128 | ntohl(cp->caddr.ip), ntohs(cp->cport), |
1129 | ntohl(cp->vaddr.ip), ntohs(cp->vport), | |
1130 | ntohl(cp->daddr.ip), ntohs(cp->dport), | |
7a4fbb1f RB |
1131 | ip_vs_state_name(cp->protocol, cp->state), |
1132 | ip_vs_origin_name(cp->flags), | |
1133 | (cp->timer.expires-jiffies)/HZ); | |
1134 | } | |
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | static const struct seq_operations ip_vs_conn_sync_seq_ops = { | |
1139 | .start = ip_vs_conn_seq_start, | |
1140 | .next = ip_vs_conn_seq_next, | |
1141 | .stop = ip_vs_conn_seq_stop, | |
1142 | .show = ip_vs_conn_sync_seq_show, | |
1143 | }; | |
1144 | ||
1145 | static int ip_vs_conn_sync_open(struct inode *inode, struct file *file) | |
1146 | { | |
6e67e586 HS |
1147 | return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops, |
1148 | sizeof(struct ip_vs_iter_state)); | |
7a4fbb1f RB |
1149 | } |
1150 | ||
1151 | static const struct file_operations ip_vs_conn_sync_fops = { | |
1152 | .owner = THIS_MODULE, | |
1153 | .open = ip_vs_conn_sync_open, | |
1154 | .read = seq_read, | |
1155 | .llseek = seq_lseek, | |
0f08190f | 1156 | .release = seq_release_net, |
7a4fbb1f RB |
1157 | }; |
1158 | ||
1da177e4 LT |
1159 | #endif |
1160 | ||
1161 | ||
1162 | /* | |
1163 | * Randomly drop connection entries before running out of memory | |
1164 | */ | |
1165 | static inline int todrop_entry(struct ip_vs_conn *cp) | |
1166 | { | |
1167 | /* | |
1168 | * The drop rate array needs tuning for real environments. | |
1169 | * Called from timer bh only => no locking | |
1170 | */ | |
9b5b5cff | 1171 | static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; |
1da177e4 LT |
1172 | static char todrop_counter[9] = {0}; |
1173 | int i; | |
1174 | ||
1175 | /* if the conn entry hasn't lasted for 60 seconds, don't drop it. | |
1176 | This will leave enough time for normal connection to get | |
1177 | through. */ | |
1178 | if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) | |
1179 | return 0; | |
1180 | ||
1181 | /* Don't drop the entry if its number of incoming packets is not | |
1182 | located in [0, 8] */ | |
1183 | i = atomic_read(&cp->in_pkts); | |
1184 | if (i > 8 || i < 0) return 0; | |
1185 | ||
1186 | if (!todrop_rate[i]) return 0; | |
1187 | if (--todrop_counter[i] > 0) return 0; | |
1188 | ||
1189 | todrop_counter[i] = todrop_rate[i]; | |
1190 | return 1; | |
1191 | } | |
1192 | ||
af9debd4 | 1193 | /* Called from keventd and must protect itself from softirqs */ |
f6340ee0 | 1194 | void ip_vs_random_dropentry(struct net *net) |
1da177e4 LT |
1195 | { |
1196 | int idx; | |
1197 | struct ip_vs_conn *cp; | |
1da177e4 LT |
1198 | |
1199 | /* | |
1200 | * Randomly scan 1/32 of the whole table every second | |
1201 | */ | |
6f7edb48 | 1202 | for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) { |
95c96174 | 1203 | unsigned int hash = net_random() & ip_vs_conn_tab_mask; |
731109e7 | 1204 | struct hlist_node *n; |
1da177e4 LT |
1205 | |
1206 | /* | |
1207 | * Lock is actually needed in this loop. | |
1208 | */ | |
af9debd4 | 1209 | ct_write_lock_bh(hash); |
1da177e4 | 1210 | |
731109e7 | 1211 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) { |
87375ab4 | 1212 | if (cp->flags & IP_VS_CONN_F_TEMPLATE) |
1da177e4 LT |
1213 | /* connection template */ |
1214 | continue; | |
f6340ee0 HS |
1215 | if (!ip_vs_conn_net_eq(cp, net)) |
1216 | continue; | |
1da177e4 LT |
1217 | if (cp->protocol == IPPROTO_TCP) { |
1218 | switch(cp->state) { | |
1219 | case IP_VS_TCP_S_SYN_RECV: | |
1220 | case IP_VS_TCP_S_SYNACK: | |
1221 | break; | |
1222 | ||
1223 | case IP_VS_TCP_S_ESTABLISHED: | |
1224 | if (todrop_entry(cp)) | |
1225 | break; | |
1226 | continue; | |
1227 | ||
1228 | default: | |
1229 | continue; | |
1230 | } | |
1231 | } else { | |
1232 | if (!todrop_entry(cp)) | |
1233 | continue; | |
1234 | } | |
1235 | ||
1da177e4 LT |
1236 | IP_VS_DBG(4, "del connection\n"); |
1237 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1238 | if (cp->control) { |
1da177e4 | 1239 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1240 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1241 | } |
1da177e4 | 1242 | } |
af9debd4 | 1243 | ct_write_unlock_bh(hash); |
1da177e4 LT |
1244 | } |
1245 | } | |
1246 | ||
1247 | ||
1248 | /* | |
1249 | * Flush all the connection entries in the ip_vs_conn_tab | |
1250 | */ | |
6e67e586 | 1251 | static void ip_vs_conn_flush(struct net *net) |
1da177e4 LT |
1252 | { |
1253 | int idx; | |
1254 | struct ip_vs_conn *cp; | |
6e67e586 | 1255 | struct netns_ipvs *ipvs = net_ipvs(net); |
1da177e4 | 1256 | |
a0840e2e | 1257 | flush_again: |
6f7edb48 | 1258 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { |
731109e7 CG |
1259 | struct hlist_node *n; |
1260 | ||
1da177e4 LT |
1261 | /* |
1262 | * Lock is actually needed in this loop. | |
1263 | */ | |
1264 | ct_write_lock_bh(idx); | |
1265 | ||
731109e7 | 1266 | hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) { |
6e67e586 HS |
1267 | if (!ip_vs_conn_net_eq(cp, net)) |
1268 | continue; | |
1da177e4 LT |
1269 | IP_VS_DBG(4, "del connection\n"); |
1270 | ip_vs_conn_expire_now(cp); | |
fb3d8949 | 1271 | if (cp->control) { |
1da177e4 | 1272 | IP_VS_DBG(4, "del conn template\n"); |
fb3d8949 | 1273 | ip_vs_conn_expire_now(cp->control); |
1da177e4 | 1274 | } |
1da177e4 LT |
1275 | } |
1276 | ct_write_unlock_bh(idx); | |
1277 | } | |
1278 | ||
1279 | /* the counter may be not NULL, because maybe some conn entries | |
1280 | are run by slow timer handler or unhashed but still referred */ | |
6e67e586 | 1281 | if (atomic_read(&ipvs->conn_count) != 0) { |
1da177e4 LT |
1282 | schedule(); |
1283 | goto flush_again; | |
1284 | } | |
1285 | } | |
61b1ab45 HS |
1286 | /* |
1287 | * per netns init and exit | |
1288 | */ | |
503cf15a | 1289 | int __net_init ip_vs_conn_net_init(struct net *net) |
61b1ab45 | 1290 | { |
6e67e586 HS |
1291 | struct netns_ipvs *ipvs = net_ipvs(net); |
1292 | ||
6e67e586 | 1293 | atomic_set(&ipvs->conn_count, 0); |
1da177e4 | 1294 | |
61b1ab45 HS |
1295 | proc_net_fops_create(net, "ip_vs_conn", 0, &ip_vs_conn_fops); |
1296 | proc_net_fops_create(net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops); | |
1297 | return 0; | |
1298 | } | |
1299 | ||
503cf15a | 1300 | void __net_exit ip_vs_conn_net_cleanup(struct net *net) |
61b1ab45 | 1301 | { |
6e67e586 HS |
1302 | /* flush all the connection entries first */ |
1303 | ip_vs_conn_flush(net); | |
61b1ab45 HS |
1304 | proc_net_remove(net, "ip_vs_conn"); |
1305 | proc_net_remove(net, "ip_vs_conn_sync"); | |
1306 | } | |
1da177e4 | 1307 | |
048cf48b | 1308 | int __init ip_vs_conn_init(void) |
1da177e4 LT |
1309 | { |
1310 | int idx; | |
1311 | ||
6f7edb48 CB |
1312 | /* Compute size and mask */ |
1313 | ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits; | |
1314 | ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1; | |
1315 | ||
1da177e4 LT |
1316 | /* |
1317 | * Allocate the connection hash table and initialize its list heads | |
1318 | */ | |
731109e7 | 1319 | ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab)); |
1da177e4 LT |
1320 | if (!ip_vs_conn_tab) |
1321 | return -ENOMEM; | |
1322 | ||
1323 | /* Allocate ip_vs_conn slab cache */ | |
1324 | ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", | |
1325 | sizeof(struct ip_vs_conn), 0, | |
20c2df83 | 1326 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1327 | if (!ip_vs_conn_cachep) { |
1328 | vfree(ip_vs_conn_tab); | |
1329 | return -ENOMEM; | |
1330 | } | |
1331 | ||
1e3e238e HE |
1332 | pr_info("Connection hash table configured " |
1333 | "(size=%d, memory=%ldKbytes)\n", | |
6f7edb48 CB |
1334 | ip_vs_conn_tab_size, |
1335 | (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024); | |
1da177e4 LT |
1336 | IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n", |
1337 | sizeof(struct ip_vs_conn)); | |
1338 | ||
731109e7 CG |
1339 | for (idx = 0; idx < ip_vs_conn_tab_size; idx++) |
1340 | INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]); | |
1da177e4 LT |
1341 | |
1342 | for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { | |
1343 | rwlock_init(&__ip_vs_conntbl_lock_array[idx].l); | |
1344 | } | |
1345 | ||
1da177e4 LT |
1346 | /* calculate the random value for connection hash */ |
1347 | get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); | |
1348 | ||
7a4f0761 | 1349 | return 0; |
1da177e4 LT |
1350 | } |
1351 | ||
1da177e4 LT |
1352 | void ip_vs_conn_cleanup(void) |
1353 | { | |
1da177e4 LT |
1354 | /* Release the empty cache */ |
1355 | kmem_cache_destroy(ip_vs_conn_cachep); | |
1da177e4 LT |
1356 | vfree(ip_vs_conn_tab); |
1357 | } |