Commit | Line | Data |
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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 | ||
61 | ||
62 | /* | |
63 | * Allocate/initialize app incarnation and register it in proto apps. | |
64 | */ | |
65 | static int | |
ab8a5e84 HS |
66 | ip_vs_app_inc_new(struct net *net, struct ip_vs_app *app, __u16 proto, |
67 | __u16 port) | |
1da177e4 LT |
68 | { |
69 | struct ip_vs_protocol *pp; | |
70 | struct ip_vs_app *inc; | |
71 | int ret; | |
72 | ||
73 | if (!(pp = ip_vs_proto_get(proto))) | |
74 | return -EPROTONOSUPPORT; | |
75 | ||
76 | if (!pp->unregister_app) | |
77 | return -EOPNOTSUPP; | |
78 | ||
8b2ed4bb | 79 | inc = kmemdup(app, sizeof(*inc), GFP_KERNEL); |
1da177e4 LT |
80 | if (!inc) |
81 | return -ENOMEM; | |
1da177e4 LT |
82 | INIT_LIST_HEAD(&inc->p_list); |
83 | INIT_LIST_HEAD(&inc->incs_list); | |
84 | inc->app = app; | |
85 | inc->port = htons(port); | |
86 | atomic_set(&inc->usecnt, 0); | |
87 | ||
88 | if (app->timeouts) { | |
89 | inc->timeout_table = | |
90 | ip_vs_create_timeout_table(app->timeouts, | |
91 | app->timeouts_size); | |
92 | if (!inc->timeout_table) { | |
93 | ret = -ENOMEM; | |
94 | goto out; | |
95 | } | |
96 | } | |
97 | ||
ab8a5e84 | 98 | ret = pp->register_app(net, inc); |
1da177e4 LT |
99 | if (ret) |
100 | goto out; | |
101 | ||
102 | list_add(&inc->a_list, &app->incs_list); | |
26c15cfd JA |
103 | IP_VS_DBG(9, "%s App %s:%u registered\n", |
104 | pp->name, inc->name, ntohs(inc->port)); | |
1da177e4 LT |
105 | |
106 | return 0; | |
107 | ||
108 | out: | |
a51482bd | 109 | kfree(inc->timeout_table); |
1da177e4 LT |
110 | kfree(inc); |
111 | return ret; | |
112 | } | |
113 | ||
114 | ||
115 | /* | |
116 | * Release app incarnation | |
117 | */ | |
118 | static void | |
ab8a5e84 | 119 | ip_vs_app_inc_release(struct net *net, struct ip_vs_app *inc) |
1da177e4 LT |
120 | { |
121 | struct ip_vs_protocol *pp; | |
122 | ||
123 | if (!(pp = ip_vs_proto_get(inc->protocol))) | |
124 | return; | |
125 | ||
126 | if (pp->unregister_app) | |
ab8a5e84 | 127 | pp->unregister_app(net, inc); |
1da177e4 LT |
128 | |
129 | IP_VS_DBG(9, "%s App %s:%u unregistered\n", | |
26c15cfd | 130 | pp->name, inc->name, ntohs(inc->port)); |
1da177e4 LT |
131 | |
132 | list_del(&inc->a_list); | |
133 | ||
a51482bd | 134 | kfree(inc->timeout_table); |
1da177e4 LT |
135 | kfree(inc); |
136 | } | |
137 | ||
138 | ||
139 | /* | |
140 | * Get reference to app inc (only called from softirq) | |
141 | * | |
142 | */ | |
143 | int ip_vs_app_inc_get(struct ip_vs_app *inc) | |
144 | { | |
145 | int result; | |
146 | ||
147 | atomic_inc(&inc->usecnt); | |
148 | if (unlikely((result = ip_vs_app_get(inc->app)) != 1)) | |
149 | atomic_dec(&inc->usecnt); | |
150 | return result; | |
151 | } | |
152 | ||
153 | ||
154 | /* | |
155 | * Put the app inc (only called from timer or net softirq) | |
156 | */ | |
157 | void ip_vs_app_inc_put(struct ip_vs_app *inc) | |
158 | { | |
159 | ip_vs_app_put(inc->app); | |
160 | atomic_dec(&inc->usecnt); | |
161 | } | |
162 | ||
163 | ||
164 | /* | |
165 | * Register an application incarnation in protocol applications | |
166 | */ | |
167 | int | |
ab8a5e84 HS |
168 | register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto, |
169 | __u16 port) | |
1da177e4 LT |
170 | { |
171 | int result; | |
172 | ||
736561a0 | 173 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 174 | |
ab8a5e84 | 175 | result = ip_vs_app_inc_new(net, app, proto, port); |
1da177e4 | 176 | |
736561a0 | 177 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
178 | |
179 | return result; | |
180 | } | |
181 | ||
182 | ||
be97fdb5 JA |
183 | /* Register application for netns */ |
184 | struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app) | |
1da177e4 | 185 | { |
ab8a5e84 | 186 | struct netns_ipvs *ipvs = net_ipvs(net); |
be97fdb5 JA |
187 | struct ip_vs_app *a; |
188 | int err = 0; | |
189 | ||
190 | if (!ipvs) | |
191 | return ERR_PTR(-ENOENT); | |
1da177e4 | 192 | |
736561a0 | 193 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 194 | |
be97fdb5 JA |
195 | list_for_each_entry(a, &ipvs->app_list, a_list) { |
196 | if (!strcmp(app->name, a->name)) { | |
197 | err = -EEXIST; | |
198 | goto out_unlock; | |
199 | } | |
200 | } | |
201 | a = kmemdup(app, sizeof(*app), GFP_KERNEL); | |
202 | if (!a) { | |
203 | err = -ENOMEM; | |
204 | goto out_unlock; | |
205 | } | |
206 | INIT_LIST_HEAD(&a->incs_list); | |
207 | list_add(&a->a_list, &ipvs->app_list); | |
208 | /* increase the module use count */ | |
209 | ip_vs_use_count_inc(); | |
1da177e4 | 210 | |
be97fdb5 | 211 | out_unlock: |
736561a0 | 212 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 | 213 | |
be97fdb5 | 214 | return err ? ERR_PTR(err) : a; |
1da177e4 LT |
215 | } |
216 | ||
217 | ||
218 | /* | |
219 | * ip_vs_app unregistration routine | |
220 | * We are sure there are no app incarnations attached to services | |
221 | */ | |
ab8a5e84 | 222 | void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app) |
1da177e4 | 223 | { |
be97fdb5 JA |
224 | struct netns_ipvs *ipvs = net_ipvs(net); |
225 | struct ip_vs_app *a, *anxt, *inc, *nxt; | |
226 | ||
227 | if (!ipvs) | |
228 | return; | |
1da177e4 | 229 | |
736561a0 | 230 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 231 | |
be97fdb5 JA |
232 | list_for_each_entry_safe(a, anxt, &ipvs->app_list, a_list) { |
233 | if (app && strcmp(app->name, a->name)) | |
234 | continue; | |
235 | list_for_each_entry_safe(inc, nxt, &a->incs_list, a_list) { | |
236 | ip_vs_app_inc_release(net, inc); | |
237 | } | |
1da177e4 | 238 | |
be97fdb5 JA |
239 | list_del(&a->a_list); |
240 | kfree(a); | |
1da177e4 | 241 | |
be97fdb5 JA |
242 | /* decrease the module use count */ |
243 | ip_vs_use_count_dec(); | |
244 | } | |
1da177e4 | 245 | |
be97fdb5 | 246 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
247 | } |
248 | ||
249 | ||
1da177e4 LT |
250 | /* |
251 | * Bind ip_vs_conn to its ip_vs_app (called by cp constructor) | |
252 | */ | |
ab8a5e84 HS |
253 | int ip_vs_bind_app(struct ip_vs_conn *cp, |
254 | struct ip_vs_protocol *pp) | |
1da177e4 LT |
255 | { |
256 | return pp->app_conn_bind(cp); | |
257 | } | |
258 | ||
259 | ||
260 | /* | |
261 | * Unbind cp from application incarnation (called by cp destructor) | |
262 | */ | |
263 | void ip_vs_unbind_app(struct ip_vs_conn *cp) | |
264 | { | |
265 | struct ip_vs_app *inc = cp->app; | |
266 | ||
267 | if (!inc) | |
268 | return; | |
269 | ||
270 | if (inc->unbind_conn) | |
271 | inc->unbind_conn(inc, cp); | |
272 | if (inc->done_conn) | |
273 | inc->done_conn(inc, cp); | |
274 | ip_vs_app_inc_put(inc); | |
275 | cp->app = NULL; | |
276 | } | |
277 | ||
278 | ||
279 | /* | |
280 | * Fixes th->seq based on ip_vs_seq info. | |
281 | */ | |
282 | static inline void vs_fix_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
283 | { | |
284 | __u32 seq = ntohl(th->seq); | |
285 | ||
286 | /* | |
287 | * Adjust seq with delta-offset for all packets after | |
288 | * the most recent resized pkt seq and with previous_delta offset | |
289 | * for all packets before most recent resized pkt seq. | |
290 | */ | |
291 | if (vseq->delta || vseq->previous_delta) { | |
292 | if(after(seq, vseq->init_seq)) { | |
293 | th->seq = htonl(seq + vseq->delta); | |
1e3e238e HE |
294 | IP_VS_DBG(9, "%s(): added delta (%d) to seq\n", |
295 | __func__, vseq->delta); | |
1da177e4 LT |
296 | } else { |
297 | th->seq = htonl(seq + vseq->previous_delta); | |
1e3e238e HE |
298 | IP_VS_DBG(9, "%s(): added previous_delta (%d) to seq\n", |
299 | __func__, vseq->previous_delta); | |
1da177e4 LT |
300 | } |
301 | } | |
302 | } | |
303 | ||
304 | ||
305 | /* | |
306 | * Fixes th->ack_seq based on ip_vs_seq info. | |
307 | */ | |
308 | static inline void | |
309 | vs_fix_ack_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
310 | { | |
311 | __u32 ack_seq = ntohl(th->ack_seq); | |
312 | ||
313 | /* | |
314 | * Adjust ack_seq with delta-offset for | |
315 | * the packets AFTER most recent resized pkt has caused a shift | |
316 | * for packets before most recent resized pkt, use previous_delta | |
317 | */ | |
318 | if (vseq->delta || vseq->previous_delta) { | |
319 | /* since ack_seq is the number of octet that is expected | |
320 | to receive next, so compare it with init_seq+delta */ | |
321 | if(after(ack_seq, vseq->init_seq+vseq->delta)) { | |
322 | th->ack_seq = htonl(ack_seq - vseq->delta); | |
1e3e238e HE |
323 | IP_VS_DBG(9, "%s(): subtracted delta " |
324 | "(%d) from ack_seq\n", __func__, vseq->delta); | |
1da177e4 LT |
325 | |
326 | } else { | |
327 | th->ack_seq = htonl(ack_seq - vseq->previous_delta); | |
1e3e238e | 328 | IP_VS_DBG(9, "%s(): subtracted " |
1da177e4 | 329 | "previous_delta (%d) from ack_seq\n", |
1e3e238e | 330 | __func__, vseq->previous_delta); |
1da177e4 LT |
331 | } |
332 | } | |
333 | } | |
334 | ||
335 | ||
336 | /* | |
337 | * Updates ip_vs_seq if pkt has been resized | |
338 | * Assumes already checked proto==IPPROTO_TCP and diff!=0. | |
339 | */ | |
340 | static inline void vs_seq_update(struct ip_vs_conn *cp, struct ip_vs_seq *vseq, | |
95c96174 | 341 | unsigned int flag, __u32 seq, int diff) |
1da177e4 LT |
342 | { |
343 | /* spinlock is to keep updating cp->flags atomic */ | |
344 | spin_lock(&cp->lock); | |
345 | if (!(cp->flags & flag) || after(seq, vseq->init_seq)) { | |
346 | vseq->previous_delta = vseq->delta; | |
347 | vseq->delta += diff; | |
348 | vseq->init_seq = seq; | |
349 | cp->flags |= flag; | |
350 | } | |
351 | spin_unlock(&cp->lock); | |
352 | } | |
353 | ||
3db05fea | 354 | static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
355 | struct ip_vs_app *app) |
356 | { | |
357 | int diff; | |
3db05fea | 358 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
359 | struct tcphdr *th; |
360 | __u32 seq; | |
361 | ||
3db05fea | 362 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
363 | return 0; |
364 | ||
3db05fea | 365 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
366 | |
367 | /* | |
368 | * Remember seq number in case this pkt gets resized | |
369 | */ | |
370 | seq = ntohl(th->seq); | |
371 | ||
372 | /* | |
373 | * Fix seq stuff if flagged as so. | |
374 | */ | |
375 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
376 | vs_fix_seq(&cp->out_seq, th); | |
377 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
378 | vs_fix_ack_seq(&cp->in_seq, th); | |
379 | ||
380 | /* | |
381 | * Call private output hook function | |
382 | */ | |
383 | if (app->pkt_out == NULL) | |
384 | return 1; | |
385 | ||
3db05fea | 386 | if (!app->pkt_out(app, cp, skb, &diff)) |
1da177e4 LT |
387 | return 0; |
388 | ||
389 | /* | |
390 | * Update ip_vs seq stuff if len has changed. | |
391 | */ | |
392 | if (diff != 0) | |
393 | vs_seq_update(cp, &cp->out_seq, | |
394 | IP_VS_CONN_F_OUT_SEQ, seq, diff); | |
395 | ||
396 | return 1; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Output pkt hook. Will call bound ip_vs_app specific function | |
401 | * called by ipvs packet handler, assumes previously checked cp!=NULL | |
402 | * returns false if it can't handle packet (oom) | |
403 | */ | |
3db05fea | 404 | int ip_vs_app_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
405 | { |
406 | struct ip_vs_app *app; | |
407 | ||
408 | /* | |
409 | * check if application module is bound to | |
410 | * this ip_vs_conn. | |
411 | */ | |
412 | if ((app = cp->app) == NULL) | |
413 | return 1; | |
414 | ||
415 | /* TCP is complicated */ | |
416 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 417 | return app_tcp_pkt_out(cp, skb, app); |
1da177e4 LT |
418 | |
419 | /* | |
420 | * Call private output hook function | |
421 | */ | |
422 | if (app->pkt_out == NULL) | |
423 | return 1; | |
424 | ||
3db05fea | 425 | return app->pkt_out(app, cp, skb, NULL); |
1da177e4 LT |
426 | } |
427 | ||
428 | ||
3db05fea | 429 | static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
430 | struct ip_vs_app *app) |
431 | { | |
432 | int diff; | |
3db05fea | 433 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
434 | struct tcphdr *th; |
435 | __u32 seq; | |
436 | ||
3db05fea | 437 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
438 | return 0; |
439 | ||
3db05fea | 440 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
441 | |
442 | /* | |
443 | * Remember seq number in case this pkt gets resized | |
444 | */ | |
445 | seq = ntohl(th->seq); | |
446 | ||
447 | /* | |
448 | * Fix seq stuff if flagged as so. | |
449 | */ | |
450 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
451 | vs_fix_seq(&cp->in_seq, th); | |
452 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
453 | vs_fix_ack_seq(&cp->out_seq, th); | |
454 | ||
455 | /* | |
456 | * Call private input hook function | |
457 | */ | |
458 | if (app->pkt_in == NULL) | |
459 | return 1; | |
460 | ||
3db05fea | 461 | if (!app->pkt_in(app, cp, skb, &diff)) |
1da177e4 LT |
462 | return 0; |
463 | ||
464 | /* | |
465 | * Update ip_vs seq stuff if len has changed. | |
466 | */ | |
467 | if (diff != 0) | |
468 | vs_seq_update(cp, &cp->in_seq, | |
469 | IP_VS_CONN_F_IN_SEQ, seq, diff); | |
470 | ||
471 | return 1; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Input pkt hook. Will call bound ip_vs_app specific function | |
476 | * called by ipvs packet handler, assumes previously checked cp!=NULL. | |
477 | * returns false if can't handle packet (oom). | |
478 | */ | |
3db05fea | 479 | int ip_vs_app_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
480 | { |
481 | struct ip_vs_app *app; | |
482 | ||
483 | /* | |
484 | * check if application module is bound to | |
485 | * this ip_vs_conn. | |
486 | */ | |
487 | if ((app = cp->app) == NULL) | |
488 | return 1; | |
489 | ||
490 | /* TCP is complicated */ | |
491 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 492 | return app_tcp_pkt_in(cp, skb, app); |
1da177e4 LT |
493 | |
494 | /* | |
495 | * Call private input hook function | |
496 | */ | |
497 | if (app->pkt_in == NULL) | |
498 | return 1; | |
499 | ||
3db05fea | 500 | return app->pkt_in(app, cp, skb, NULL); |
1da177e4 LT |
501 | } |
502 | ||
503 | ||
504 | #ifdef CONFIG_PROC_FS | |
505 | /* | |
506 | * /proc/net/ip_vs_app entry function | |
507 | */ | |
508 | ||
ab8a5e84 | 509 | static struct ip_vs_app *ip_vs_app_idx(struct netns_ipvs *ipvs, loff_t pos) |
1da177e4 LT |
510 | { |
511 | struct ip_vs_app *app, *inc; | |
512 | ||
ab8a5e84 | 513 | list_for_each_entry(app, &ipvs->app_list, a_list) { |
1da177e4 LT |
514 | list_for_each_entry(inc, &app->incs_list, a_list) { |
515 | if (pos-- == 0) | |
516 | return inc; | |
517 | } | |
518 | } | |
519 | return NULL; | |
520 | ||
521 | } | |
522 | ||
523 | static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos) | |
524 | { | |
ab8a5e84 HS |
525 | struct net *net = seq_file_net(seq); |
526 | struct netns_ipvs *ipvs = net_ipvs(net); | |
527 | ||
736561a0 | 528 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 | 529 | |
ab8a5e84 | 530 | return *pos ? ip_vs_app_idx(ipvs, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
531 | } |
532 | ||
533 | static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
534 | { | |
535 | struct ip_vs_app *inc, *app; | |
536 | struct list_head *e; | |
ab8a5e84 HS |
537 | struct net *net = seq_file_net(seq); |
538 | struct netns_ipvs *ipvs = net_ipvs(net); | |
1da177e4 LT |
539 | |
540 | ++*pos; | |
541 | if (v == SEQ_START_TOKEN) | |
ab8a5e84 | 542 | return ip_vs_app_idx(ipvs, 0); |
1da177e4 LT |
543 | |
544 | inc = v; | |
545 | app = inc->app; | |
546 | ||
547 | if ((e = inc->a_list.next) != &app->incs_list) | |
548 | return list_entry(e, struct ip_vs_app, a_list); | |
549 | ||
550 | /* go on to next application */ | |
ab8a5e84 | 551 | for (e = app->a_list.next; e != &ipvs->app_list; e = e->next) { |
1da177e4 LT |
552 | app = list_entry(e, struct ip_vs_app, a_list); |
553 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
554 | return inc; | |
555 | } | |
556 | } | |
557 | return NULL; | |
558 | } | |
559 | ||
560 | static void ip_vs_app_seq_stop(struct seq_file *seq, void *v) | |
561 | { | |
736561a0 | 562 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
563 | } |
564 | ||
565 | static int ip_vs_app_seq_show(struct seq_file *seq, void *v) | |
566 | { | |
567 | if (v == SEQ_START_TOKEN) | |
568 | seq_puts(seq, "prot port usecnt name\n"); | |
569 | else { | |
570 | const struct ip_vs_app *inc = v; | |
571 | ||
572 | seq_printf(seq, "%-3s %-7u %-6d %-17s\n", | |
573 | ip_vs_proto_name(inc->protocol), | |
574 | ntohs(inc->port), | |
575 | atomic_read(&inc->usecnt), | |
576 | inc->name); | |
577 | } | |
578 | return 0; | |
579 | } | |
580 | ||
56b3d975 | 581 | static const struct seq_operations ip_vs_app_seq_ops = { |
1da177e4 LT |
582 | .start = ip_vs_app_seq_start, |
583 | .next = ip_vs_app_seq_next, | |
584 | .stop = ip_vs_app_seq_stop, | |
585 | .show = ip_vs_app_seq_show, | |
586 | }; | |
587 | ||
588 | static int ip_vs_app_open(struct inode *inode, struct file *file) | |
589 | { | |
ab8a5e84 HS |
590 | return seq_open_net(inode, file, &ip_vs_app_seq_ops, |
591 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
592 | } |
593 | ||
9a32144e | 594 | static const struct file_operations ip_vs_app_fops = { |
1da177e4 LT |
595 | .owner = THIS_MODULE, |
596 | .open = ip_vs_app_open, | |
597 | .read = seq_read, | |
598 | .llseek = seq_lseek, | |
0f08190f | 599 | .release = seq_release_net, |
1da177e4 LT |
600 | }; |
601 | #endif | |
602 | ||
503cf15a | 603 | int __net_init ip_vs_app_net_init(struct net *net) |
1da177e4 | 604 | { |
ab8a5e84 HS |
605 | struct netns_ipvs *ipvs = net_ipvs(net); |
606 | ||
ab8a5e84 | 607 | INIT_LIST_HEAD(&ipvs->app_list); |
d4beaa66 | 608 | proc_create("ip_vs_app", 0, net->proc_net, &ip_vs_app_fops); |
1da177e4 LT |
609 | return 0; |
610 | } | |
611 | ||
503cf15a | 612 | void __net_exit ip_vs_app_net_cleanup(struct net *net) |
61b1ab45 | 613 | { |
be97fdb5 | 614 | unregister_ip_vs_app(net, NULL /* all */); |
61b1ab45 HS |
615 | proc_net_remove(net, "ip_vs_app"); |
616 | } |