]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * ip_vs_app.c: Application module support for IPVS | |
3 | * | |
1da177e4 LT |
4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * Most code here is taken from ip_masq_app.c in kernel 2.2. The difference | |
12 | * is that ip_vs_app module handles the reverse direction (incoming requests | |
13 | * and outgoing responses). | |
14 | * | |
15 | * IP_MASQ_APP application masquerading module | |
16 | * | |
17 | * Author: Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar> | |
18 | * | |
19 | */ | |
20 | ||
9aada7ac HE |
21 | #define KMSG_COMPONENT "IPVS" |
22 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
23 | ||
1da177e4 LT |
24 | #include <linux/module.h> |
25 | #include <linux/kernel.h> | |
26 | #include <linux/skbuff.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/ip.h> | |
af1e1cf0 | 29 | #include <linux/netfilter.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
457c4cbc | 31 | #include <net/net_namespace.h> |
1da177e4 | 32 | #include <net/protocol.h> |
c752f073 | 33 | #include <net/tcp.h> |
1da177e4 LT |
34 | #include <linux/stat.h> |
35 | #include <linux/proc_fs.h> | |
36 | #include <linux/seq_file.h> | |
57b47a53 | 37 | #include <linux/mutex.h> |
1da177e4 LT |
38 | |
39 | #include <net/ip_vs.h> | |
40 | ||
41 | EXPORT_SYMBOL(register_ip_vs_app); | |
42 | EXPORT_SYMBOL(unregister_ip_vs_app); | |
43 | EXPORT_SYMBOL(register_ip_vs_app_inc); | |
44 | ||
736561a0 SH |
45 | static DEFINE_MUTEX(__ip_vs_app_mutex); |
46 | ||
1da177e4 LT |
47 | /* |
48 | * Get an ip_vs_app object | |
49 | */ | |
50 | static inline int ip_vs_app_get(struct ip_vs_app *app) | |
51 | { | |
85b60680 | 52 | return try_module_get(app->module); |
1da177e4 LT |
53 | } |
54 | ||
55 | ||
56 | static inline void ip_vs_app_put(struct ip_vs_app *app) | |
57 | { | |
85b60680 | 58 | module_put(app->module); |
1da177e4 LT |
59 | } |
60 | ||
363c97d7 JA |
61 | static void ip_vs_app_inc_destroy(struct ip_vs_app *inc) |
62 | { | |
63 | kfree(inc->timeout_table); | |
64 | kfree(inc); | |
65 | } | |
66 | ||
67 | static void ip_vs_app_inc_rcu_free(struct rcu_head *head) | |
68 | { | |
69 | struct ip_vs_app *inc = container_of(head, struct ip_vs_app, rcu_head); | |
70 | ||
71 | ip_vs_app_inc_destroy(inc); | |
72 | } | |
1da177e4 LT |
73 | |
74 | /* | |
75 | * Allocate/initialize app incarnation and register it in proto apps. | |
76 | */ | |
77 | static int | |
ab8a5e84 HS |
78 | ip_vs_app_inc_new(struct net *net, struct ip_vs_app *app, __u16 proto, |
79 | __u16 port) | |
1da177e4 LT |
80 | { |
81 | struct ip_vs_protocol *pp; | |
82 | struct ip_vs_app *inc; | |
83 | int ret; | |
84 | ||
85 | if (!(pp = ip_vs_proto_get(proto))) | |
86 | return -EPROTONOSUPPORT; | |
87 | ||
88 | if (!pp->unregister_app) | |
89 | return -EOPNOTSUPP; | |
90 | ||
8b2ed4bb | 91 | inc = kmemdup(app, sizeof(*inc), GFP_KERNEL); |
1da177e4 LT |
92 | if (!inc) |
93 | return -ENOMEM; | |
1da177e4 LT |
94 | INIT_LIST_HEAD(&inc->p_list); |
95 | INIT_LIST_HEAD(&inc->incs_list); | |
96 | inc->app = app; | |
97 | inc->port = htons(port); | |
98 | atomic_set(&inc->usecnt, 0); | |
99 | ||
100 | if (app->timeouts) { | |
101 | inc->timeout_table = | |
102 | ip_vs_create_timeout_table(app->timeouts, | |
103 | app->timeouts_size); | |
104 | if (!inc->timeout_table) { | |
105 | ret = -ENOMEM; | |
106 | goto out; | |
107 | } | |
108 | } | |
109 | ||
ab8a5e84 | 110 | ret = pp->register_app(net, inc); |
1da177e4 LT |
111 | if (ret) |
112 | goto out; | |
113 | ||
114 | list_add(&inc->a_list, &app->incs_list); | |
26c15cfd JA |
115 | IP_VS_DBG(9, "%s App %s:%u registered\n", |
116 | pp->name, inc->name, ntohs(inc->port)); | |
1da177e4 LT |
117 | |
118 | return 0; | |
119 | ||
120 | out: | |
363c97d7 | 121 | ip_vs_app_inc_destroy(inc); |
1da177e4 LT |
122 | return ret; |
123 | } | |
124 | ||
125 | ||
126 | /* | |
127 | * Release app incarnation | |
128 | */ | |
129 | static void | |
ab8a5e84 | 130 | ip_vs_app_inc_release(struct net *net, struct ip_vs_app *inc) |
1da177e4 LT |
131 | { |
132 | struct ip_vs_protocol *pp; | |
133 | ||
134 | if (!(pp = ip_vs_proto_get(inc->protocol))) | |
135 | return; | |
136 | ||
137 | if (pp->unregister_app) | |
ab8a5e84 | 138 | pp->unregister_app(net, inc); |
1da177e4 LT |
139 | |
140 | IP_VS_DBG(9, "%s App %s:%u unregistered\n", | |
26c15cfd | 141 | pp->name, inc->name, ntohs(inc->port)); |
1da177e4 LT |
142 | |
143 | list_del(&inc->a_list); | |
144 | ||
363c97d7 | 145 | call_rcu(&inc->rcu_head, ip_vs_app_inc_rcu_free); |
1da177e4 LT |
146 | } |
147 | ||
148 | ||
149 | /* | |
150 | * Get reference to app inc (only called from softirq) | |
151 | * | |
152 | */ | |
153 | int ip_vs_app_inc_get(struct ip_vs_app *inc) | |
154 | { | |
155 | int result; | |
156 | ||
363c97d7 JA |
157 | result = ip_vs_app_get(inc->app); |
158 | if (result) | |
159 | atomic_inc(&inc->usecnt); | |
1da177e4 LT |
160 | return result; |
161 | } | |
162 | ||
163 | ||
164 | /* | |
165 | * Put the app inc (only called from timer or net softirq) | |
166 | */ | |
167 | void ip_vs_app_inc_put(struct ip_vs_app *inc) | |
168 | { | |
1da177e4 | 169 | atomic_dec(&inc->usecnt); |
363c97d7 | 170 | ip_vs_app_put(inc->app); |
1da177e4 LT |
171 | } |
172 | ||
173 | ||
174 | /* | |
175 | * Register an application incarnation in protocol applications | |
176 | */ | |
177 | int | |
ab8a5e84 HS |
178 | register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto, |
179 | __u16 port) | |
1da177e4 LT |
180 | { |
181 | int result; | |
182 | ||
736561a0 | 183 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 184 | |
ab8a5e84 | 185 | result = ip_vs_app_inc_new(net, app, proto, port); |
1da177e4 | 186 | |
736561a0 | 187 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
188 | |
189 | return result; | |
190 | } | |
191 | ||
192 | ||
be97fdb5 JA |
193 | /* Register application for netns */ |
194 | struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app) | |
1da177e4 | 195 | { |
ab8a5e84 | 196 | struct netns_ipvs *ipvs = net_ipvs(net); |
be97fdb5 JA |
197 | struct ip_vs_app *a; |
198 | int err = 0; | |
199 | ||
200 | if (!ipvs) | |
201 | return ERR_PTR(-ENOENT); | |
1da177e4 | 202 | |
736561a0 | 203 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 204 | |
be97fdb5 JA |
205 | list_for_each_entry(a, &ipvs->app_list, a_list) { |
206 | if (!strcmp(app->name, a->name)) { | |
207 | err = -EEXIST; | |
208 | goto out_unlock; | |
209 | } | |
210 | } | |
211 | a = kmemdup(app, sizeof(*app), GFP_KERNEL); | |
212 | if (!a) { | |
213 | err = -ENOMEM; | |
214 | goto out_unlock; | |
215 | } | |
216 | INIT_LIST_HEAD(&a->incs_list); | |
217 | list_add(&a->a_list, &ipvs->app_list); | |
218 | /* increase the module use count */ | |
219 | ip_vs_use_count_inc(); | |
1da177e4 | 220 | |
be97fdb5 | 221 | out_unlock: |
736561a0 | 222 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 | 223 | |
be97fdb5 | 224 | return err ? ERR_PTR(err) : a; |
1da177e4 LT |
225 | } |
226 | ||
227 | ||
228 | /* | |
229 | * ip_vs_app unregistration routine | |
230 | * We are sure there are no app incarnations attached to services | |
363c97d7 | 231 | * Caller should use synchronize_rcu() or rcu_barrier() |
1da177e4 | 232 | */ |
ab8a5e84 | 233 | void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app) |
1da177e4 | 234 | { |
be97fdb5 JA |
235 | struct netns_ipvs *ipvs = net_ipvs(net); |
236 | struct ip_vs_app *a, *anxt, *inc, *nxt; | |
237 | ||
238 | if (!ipvs) | |
239 | return; | |
1da177e4 | 240 | |
736561a0 | 241 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 242 | |
be97fdb5 JA |
243 | list_for_each_entry_safe(a, anxt, &ipvs->app_list, a_list) { |
244 | if (app && strcmp(app->name, a->name)) | |
245 | continue; | |
246 | list_for_each_entry_safe(inc, nxt, &a->incs_list, a_list) { | |
247 | ip_vs_app_inc_release(net, inc); | |
248 | } | |
1da177e4 | 249 | |
be97fdb5 JA |
250 | list_del(&a->a_list); |
251 | kfree(a); | |
1da177e4 | 252 | |
be97fdb5 JA |
253 | /* decrease the module use count */ |
254 | ip_vs_use_count_dec(); | |
255 | } | |
1da177e4 | 256 | |
be97fdb5 | 257 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
258 | } |
259 | ||
260 | ||
1da177e4 LT |
261 | /* |
262 | * Bind ip_vs_conn to its ip_vs_app (called by cp constructor) | |
263 | */ | |
ab8a5e84 HS |
264 | int ip_vs_bind_app(struct ip_vs_conn *cp, |
265 | struct ip_vs_protocol *pp) | |
1da177e4 LT |
266 | { |
267 | return pp->app_conn_bind(cp); | |
268 | } | |
269 | ||
270 | ||
271 | /* | |
272 | * Unbind cp from application incarnation (called by cp destructor) | |
273 | */ | |
274 | void ip_vs_unbind_app(struct ip_vs_conn *cp) | |
275 | { | |
276 | struct ip_vs_app *inc = cp->app; | |
277 | ||
278 | if (!inc) | |
279 | return; | |
280 | ||
281 | if (inc->unbind_conn) | |
282 | inc->unbind_conn(inc, cp); | |
283 | if (inc->done_conn) | |
284 | inc->done_conn(inc, cp); | |
285 | ip_vs_app_inc_put(inc); | |
286 | cp->app = NULL; | |
287 | } | |
288 | ||
289 | ||
290 | /* | |
291 | * Fixes th->seq based on ip_vs_seq info. | |
292 | */ | |
293 | static inline void vs_fix_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
294 | { | |
295 | __u32 seq = ntohl(th->seq); | |
296 | ||
297 | /* | |
298 | * Adjust seq with delta-offset for all packets after | |
299 | * the most recent resized pkt seq and with previous_delta offset | |
300 | * for all packets before most recent resized pkt seq. | |
301 | */ | |
302 | if (vseq->delta || vseq->previous_delta) { | |
303 | if(after(seq, vseq->init_seq)) { | |
304 | th->seq = htonl(seq + vseq->delta); | |
1e3e238e HE |
305 | IP_VS_DBG(9, "%s(): added delta (%d) to seq\n", |
306 | __func__, vseq->delta); | |
1da177e4 LT |
307 | } else { |
308 | th->seq = htonl(seq + vseq->previous_delta); | |
1e3e238e HE |
309 | IP_VS_DBG(9, "%s(): added previous_delta (%d) to seq\n", |
310 | __func__, vseq->previous_delta); | |
1da177e4 LT |
311 | } |
312 | } | |
313 | } | |
314 | ||
315 | ||
316 | /* | |
317 | * Fixes th->ack_seq based on ip_vs_seq info. | |
318 | */ | |
319 | static inline void | |
320 | vs_fix_ack_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
321 | { | |
322 | __u32 ack_seq = ntohl(th->ack_seq); | |
323 | ||
324 | /* | |
325 | * Adjust ack_seq with delta-offset for | |
326 | * the packets AFTER most recent resized pkt has caused a shift | |
327 | * for packets before most recent resized pkt, use previous_delta | |
328 | */ | |
329 | if (vseq->delta || vseq->previous_delta) { | |
330 | /* since ack_seq is the number of octet that is expected | |
331 | to receive next, so compare it with init_seq+delta */ | |
332 | if(after(ack_seq, vseq->init_seq+vseq->delta)) { | |
333 | th->ack_seq = htonl(ack_seq - vseq->delta); | |
1e3e238e HE |
334 | IP_VS_DBG(9, "%s(): subtracted delta " |
335 | "(%d) from ack_seq\n", __func__, vseq->delta); | |
1da177e4 LT |
336 | |
337 | } else { | |
338 | th->ack_seq = htonl(ack_seq - vseq->previous_delta); | |
1e3e238e | 339 | IP_VS_DBG(9, "%s(): subtracted " |
1da177e4 | 340 | "previous_delta (%d) from ack_seq\n", |
1e3e238e | 341 | __func__, vseq->previous_delta); |
1da177e4 LT |
342 | } |
343 | } | |
344 | } | |
345 | ||
346 | ||
347 | /* | |
348 | * Updates ip_vs_seq if pkt has been resized | |
349 | * Assumes already checked proto==IPPROTO_TCP and diff!=0. | |
350 | */ | |
351 | static inline void vs_seq_update(struct ip_vs_conn *cp, struct ip_vs_seq *vseq, | |
95c96174 | 352 | unsigned int flag, __u32 seq, int diff) |
1da177e4 LT |
353 | { |
354 | /* spinlock is to keep updating cp->flags atomic */ | |
ac69269a | 355 | spin_lock_bh(&cp->lock); |
1da177e4 LT |
356 | if (!(cp->flags & flag) || after(seq, vseq->init_seq)) { |
357 | vseq->previous_delta = vseq->delta; | |
358 | vseq->delta += diff; | |
359 | vseq->init_seq = seq; | |
360 | cp->flags |= flag; | |
361 | } | |
ac69269a | 362 | spin_unlock_bh(&cp->lock); |
1da177e4 LT |
363 | } |
364 | ||
3db05fea | 365 | static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
366 | struct ip_vs_app *app) |
367 | { | |
368 | int diff; | |
3db05fea | 369 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
370 | struct tcphdr *th; |
371 | __u32 seq; | |
372 | ||
3db05fea | 373 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
374 | return 0; |
375 | ||
3db05fea | 376 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
377 | |
378 | /* | |
379 | * Remember seq number in case this pkt gets resized | |
380 | */ | |
381 | seq = ntohl(th->seq); | |
382 | ||
383 | /* | |
384 | * Fix seq stuff if flagged as so. | |
385 | */ | |
386 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
387 | vs_fix_seq(&cp->out_seq, th); | |
388 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
389 | vs_fix_ack_seq(&cp->in_seq, th); | |
390 | ||
391 | /* | |
392 | * Call private output hook function | |
393 | */ | |
394 | if (app->pkt_out == NULL) | |
395 | return 1; | |
396 | ||
3db05fea | 397 | if (!app->pkt_out(app, cp, skb, &diff)) |
1da177e4 LT |
398 | return 0; |
399 | ||
400 | /* | |
401 | * Update ip_vs seq stuff if len has changed. | |
402 | */ | |
403 | if (diff != 0) | |
404 | vs_seq_update(cp, &cp->out_seq, | |
405 | IP_VS_CONN_F_OUT_SEQ, seq, diff); | |
406 | ||
407 | return 1; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Output pkt hook. Will call bound ip_vs_app specific function | |
412 | * called by ipvs packet handler, assumes previously checked cp!=NULL | |
413 | * returns false if it can't handle packet (oom) | |
414 | */ | |
3db05fea | 415 | int ip_vs_app_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
416 | { |
417 | struct ip_vs_app *app; | |
418 | ||
419 | /* | |
420 | * check if application module is bound to | |
421 | * this ip_vs_conn. | |
422 | */ | |
423 | if ((app = cp->app) == NULL) | |
424 | return 1; | |
425 | ||
426 | /* TCP is complicated */ | |
427 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 428 | return app_tcp_pkt_out(cp, skb, app); |
1da177e4 LT |
429 | |
430 | /* | |
431 | * Call private output hook function | |
432 | */ | |
433 | if (app->pkt_out == NULL) | |
434 | return 1; | |
435 | ||
3db05fea | 436 | return app->pkt_out(app, cp, skb, NULL); |
1da177e4 LT |
437 | } |
438 | ||
439 | ||
3db05fea | 440 | static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
441 | struct ip_vs_app *app) |
442 | { | |
443 | int diff; | |
3db05fea | 444 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
445 | struct tcphdr *th; |
446 | __u32 seq; | |
447 | ||
3db05fea | 448 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
449 | return 0; |
450 | ||
3db05fea | 451 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
452 | |
453 | /* | |
454 | * Remember seq number in case this pkt gets resized | |
455 | */ | |
456 | seq = ntohl(th->seq); | |
457 | ||
458 | /* | |
459 | * Fix seq stuff if flagged as so. | |
460 | */ | |
461 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
462 | vs_fix_seq(&cp->in_seq, th); | |
463 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
464 | vs_fix_ack_seq(&cp->out_seq, th); | |
465 | ||
466 | /* | |
467 | * Call private input hook function | |
468 | */ | |
469 | if (app->pkt_in == NULL) | |
470 | return 1; | |
471 | ||
3db05fea | 472 | if (!app->pkt_in(app, cp, skb, &diff)) |
1da177e4 LT |
473 | return 0; |
474 | ||
475 | /* | |
476 | * Update ip_vs seq stuff if len has changed. | |
477 | */ | |
478 | if (diff != 0) | |
479 | vs_seq_update(cp, &cp->in_seq, | |
480 | IP_VS_CONN_F_IN_SEQ, seq, diff); | |
481 | ||
482 | return 1; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Input pkt hook. Will call bound ip_vs_app specific function | |
487 | * called by ipvs packet handler, assumes previously checked cp!=NULL. | |
488 | * returns false if can't handle packet (oom). | |
489 | */ | |
3db05fea | 490 | int ip_vs_app_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
491 | { |
492 | struct ip_vs_app *app; | |
493 | ||
494 | /* | |
495 | * check if application module is bound to | |
496 | * this ip_vs_conn. | |
497 | */ | |
498 | if ((app = cp->app) == NULL) | |
499 | return 1; | |
500 | ||
501 | /* TCP is complicated */ | |
502 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 503 | return app_tcp_pkt_in(cp, skb, app); |
1da177e4 LT |
504 | |
505 | /* | |
506 | * Call private input hook function | |
507 | */ | |
508 | if (app->pkt_in == NULL) | |
509 | return 1; | |
510 | ||
3db05fea | 511 | return app->pkt_in(app, cp, skb, NULL); |
1da177e4 LT |
512 | } |
513 | ||
514 | ||
515 | #ifdef CONFIG_PROC_FS | |
516 | /* | |
517 | * /proc/net/ip_vs_app entry function | |
518 | */ | |
519 | ||
ab8a5e84 | 520 | static struct ip_vs_app *ip_vs_app_idx(struct netns_ipvs *ipvs, loff_t pos) |
1da177e4 LT |
521 | { |
522 | struct ip_vs_app *app, *inc; | |
523 | ||
ab8a5e84 | 524 | list_for_each_entry(app, &ipvs->app_list, a_list) { |
1da177e4 LT |
525 | list_for_each_entry(inc, &app->incs_list, a_list) { |
526 | if (pos-- == 0) | |
527 | return inc; | |
528 | } | |
529 | } | |
530 | return NULL; | |
531 | ||
532 | } | |
533 | ||
534 | static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos) | |
535 | { | |
ab8a5e84 HS |
536 | struct net *net = seq_file_net(seq); |
537 | struct netns_ipvs *ipvs = net_ipvs(net); | |
538 | ||
736561a0 | 539 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 540 | |
ab8a5e84 | 541 | return *pos ? ip_vs_app_idx(ipvs, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
542 | } |
543 | ||
544 | static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
545 | { | |
546 | struct ip_vs_app *inc, *app; | |
547 | struct list_head *e; | |
ab8a5e84 HS |
548 | struct net *net = seq_file_net(seq); |
549 | struct netns_ipvs *ipvs = net_ipvs(net); | |
1da177e4 LT |
550 | |
551 | ++*pos; | |
552 | if (v == SEQ_START_TOKEN) | |
ab8a5e84 | 553 | return ip_vs_app_idx(ipvs, 0); |
1da177e4 LT |
554 | |
555 | inc = v; | |
556 | app = inc->app; | |
557 | ||
558 | if ((e = inc->a_list.next) != &app->incs_list) | |
559 | return list_entry(e, struct ip_vs_app, a_list); | |
560 | ||
561 | /* go on to next application */ | |
ab8a5e84 | 562 | for (e = app->a_list.next; e != &ipvs->app_list; e = e->next) { |
1da177e4 LT |
563 | app = list_entry(e, struct ip_vs_app, a_list); |
564 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
565 | return inc; | |
566 | } | |
567 | } | |
568 | return NULL; | |
569 | } | |
570 | ||
571 | static void ip_vs_app_seq_stop(struct seq_file *seq, void *v) | |
572 | { | |
736561a0 | 573 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
574 | } |
575 | ||
576 | static int ip_vs_app_seq_show(struct seq_file *seq, void *v) | |
577 | { | |
578 | if (v == SEQ_START_TOKEN) | |
579 | seq_puts(seq, "prot port usecnt name\n"); | |
580 | else { | |
581 | const struct ip_vs_app *inc = v; | |
582 | ||
583 | seq_printf(seq, "%-3s %-7u %-6d %-17s\n", | |
584 | ip_vs_proto_name(inc->protocol), | |
585 | ntohs(inc->port), | |
586 | atomic_read(&inc->usecnt), | |
587 | inc->name); | |
588 | } | |
589 | return 0; | |
590 | } | |
591 | ||
56b3d975 | 592 | static const struct seq_operations ip_vs_app_seq_ops = { |
1da177e4 LT |
593 | .start = ip_vs_app_seq_start, |
594 | .next = ip_vs_app_seq_next, | |
595 | .stop = ip_vs_app_seq_stop, | |
596 | .show = ip_vs_app_seq_show, | |
597 | }; | |
598 | ||
599 | static int ip_vs_app_open(struct inode *inode, struct file *file) | |
600 | { | |
ab8a5e84 HS |
601 | return seq_open_net(inode, file, &ip_vs_app_seq_ops, |
602 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
603 | } |
604 | ||
9a32144e | 605 | static const struct file_operations ip_vs_app_fops = { |
1da177e4 LT |
606 | .owner = THIS_MODULE, |
607 | .open = ip_vs_app_open, | |
608 | .read = seq_read, | |
609 | .llseek = seq_lseek, | |
0f08190f | 610 | .release = seq_release_net, |
1da177e4 LT |
611 | }; |
612 | #endif | |
613 | ||
503cf15a | 614 | int __net_init ip_vs_app_net_init(struct net *net) |
1da177e4 | 615 | { |
ab8a5e84 HS |
616 | struct netns_ipvs *ipvs = net_ipvs(net); |
617 | ||
ab8a5e84 | 618 | INIT_LIST_HEAD(&ipvs->app_list); |
d4beaa66 | 619 | proc_create("ip_vs_app", 0, net->proc_net, &ip_vs_app_fops); |
1da177e4 LT |
620 | return 0; |
621 | } | |
622 | ||
503cf15a | 623 | void __net_exit ip_vs_app_net_cleanup(struct net *net) |
61b1ab45 | 624 | { |
be97fdb5 | 625 | unregister_ip_vs_app(net, NULL /* all */); |
ece31ffd | 626 | remove_proc_entry("ip_vs_app", net->proc_net); |
61b1ab45 | 627 | } |