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 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/ip.h> | |
af1e1cf0 | 26 | #include <linux/netfilter.h> |
457c4cbc | 27 | #include <net/net_namespace.h> |
1da177e4 | 28 | #include <net/protocol.h> |
c752f073 | 29 | #include <net/tcp.h> |
1da177e4 LT |
30 | #include <asm/system.h> |
31 | #include <linux/stat.h> | |
32 | #include <linux/proc_fs.h> | |
33 | #include <linux/seq_file.h> | |
57b47a53 | 34 | #include <linux/mutex.h> |
1da177e4 LT |
35 | |
36 | #include <net/ip_vs.h> | |
37 | ||
38 | EXPORT_SYMBOL(register_ip_vs_app); | |
39 | EXPORT_SYMBOL(unregister_ip_vs_app); | |
40 | EXPORT_SYMBOL(register_ip_vs_app_inc); | |
41 | ||
42 | /* ipvs application list head */ | |
43 | static LIST_HEAD(ip_vs_app_list); | |
57b47a53 | 44 | static DEFINE_MUTEX(__ip_vs_app_mutex); |
1da177e4 LT |
45 | |
46 | ||
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 | |
66 | ip_vs_app_inc_new(struct ip_vs_app *app, __u16 proto, __u16 port) | |
67 | { | |
68 | struct ip_vs_protocol *pp; | |
69 | struct ip_vs_app *inc; | |
70 | int ret; | |
71 | ||
72 | if (!(pp = ip_vs_proto_get(proto))) | |
73 | return -EPROTONOSUPPORT; | |
74 | ||
75 | if (!pp->unregister_app) | |
76 | return -EOPNOTSUPP; | |
77 | ||
8b2ed4bb | 78 | inc = kmemdup(app, sizeof(*inc), GFP_KERNEL); |
1da177e4 LT |
79 | if (!inc) |
80 | return -ENOMEM; | |
1da177e4 LT |
81 | INIT_LIST_HEAD(&inc->p_list); |
82 | INIT_LIST_HEAD(&inc->incs_list); | |
83 | inc->app = app; | |
84 | inc->port = htons(port); | |
85 | atomic_set(&inc->usecnt, 0); | |
86 | ||
87 | if (app->timeouts) { | |
88 | inc->timeout_table = | |
89 | ip_vs_create_timeout_table(app->timeouts, | |
90 | app->timeouts_size); | |
91 | if (!inc->timeout_table) { | |
92 | ret = -ENOMEM; | |
93 | goto out; | |
94 | } | |
95 | } | |
96 | ||
97 | ret = pp->register_app(inc); | |
98 | if (ret) | |
99 | goto out; | |
100 | ||
101 | list_add(&inc->a_list, &app->incs_list); | |
102 | IP_VS_DBG(9, "%s application %s:%u registered\n", | |
103 | pp->name, inc->name, inc->port); | |
104 | ||
105 | return 0; | |
106 | ||
107 | out: | |
a51482bd | 108 | kfree(inc->timeout_table); |
1da177e4 LT |
109 | kfree(inc); |
110 | return ret; | |
111 | } | |
112 | ||
113 | ||
114 | /* | |
115 | * Release app incarnation | |
116 | */ | |
117 | static void | |
118 | ip_vs_app_inc_release(struct ip_vs_app *inc) | |
119 | { | |
120 | struct ip_vs_protocol *pp; | |
121 | ||
122 | if (!(pp = ip_vs_proto_get(inc->protocol))) | |
123 | return; | |
124 | ||
125 | if (pp->unregister_app) | |
126 | pp->unregister_app(inc); | |
127 | ||
128 | IP_VS_DBG(9, "%s App %s:%u unregistered\n", | |
129 | pp->name, inc->name, inc->port); | |
130 | ||
131 | list_del(&inc->a_list); | |
132 | ||
a51482bd | 133 | kfree(inc->timeout_table); |
1da177e4 LT |
134 | kfree(inc); |
135 | } | |
136 | ||
137 | ||
138 | /* | |
139 | * Get reference to app inc (only called from softirq) | |
140 | * | |
141 | */ | |
142 | int ip_vs_app_inc_get(struct ip_vs_app *inc) | |
143 | { | |
144 | int result; | |
145 | ||
146 | atomic_inc(&inc->usecnt); | |
147 | if (unlikely((result = ip_vs_app_get(inc->app)) != 1)) | |
148 | atomic_dec(&inc->usecnt); | |
149 | return result; | |
150 | } | |
151 | ||
152 | ||
153 | /* | |
154 | * Put the app inc (only called from timer or net softirq) | |
155 | */ | |
156 | void ip_vs_app_inc_put(struct ip_vs_app *inc) | |
157 | { | |
158 | ip_vs_app_put(inc->app); | |
159 | atomic_dec(&inc->usecnt); | |
160 | } | |
161 | ||
162 | ||
163 | /* | |
164 | * Register an application incarnation in protocol applications | |
165 | */ | |
166 | int | |
167 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port) | |
168 | { | |
169 | int result; | |
170 | ||
57b47a53 | 171 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
172 | |
173 | result = ip_vs_app_inc_new(app, proto, port); | |
174 | ||
57b47a53 | 175 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
176 | |
177 | return result; | |
178 | } | |
179 | ||
180 | ||
181 | /* | |
182 | * ip_vs_app registration routine | |
183 | */ | |
184 | int register_ip_vs_app(struct ip_vs_app *app) | |
185 | { | |
186 | /* increase the module use count */ | |
187 | ip_vs_use_count_inc(); | |
188 | ||
57b47a53 | 189 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
190 | |
191 | list_add(&app->a_list, &ip_vs_app_list); | |
192 | ||
57b47a53 | 193 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
194 | |
195 | return 0; | |
196 | } | |
197 | ||
198 | ||
199 | /* | |
200 | * ip_vs_app unregistration routine | |
201 | * We are sure there are no app incarnations attached to services | |
202 | */ | |
203 | void unregister_ip_vs_app(struct ip_vs_app *app) | |
204 | { | |
205 | struct ip_vs_app *inc, *nxt; | |
206 | ||
57b47a53 | 207 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
208 | |
209 | list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) { | |
210 | ip_vs_app_inc_release(inc); | |
211 | } | |
212 | ||
213 | list_del(&app->a_list); | |
214 | ||
57b47a53 | 215 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
216 | |
217 | /* decrease the module use count */ | |
218 | ip_vs_use_count_dec(); | |
219 | } | |
220 | ||
221 | ||
1da177e4 LT |
222 | /* |
223 | * Bind ip_vs_conn to its ip_vs_app (called by cp constructor) | |
224 | */ | |
225 | int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp) | |
226 | { | |
227 | return pp->app_conn_bind(cp); | |
228 | } | |
229 | ||
230 | ||
231 | /* | |
232 | * Unbind cp from application incarnation (called by cp destructor) | |
233 | */ | |
234 | void ip_vs_unbind_app(struct ip_vs_conn *cp) | |
235 | { | |
236 | struct ip_vs_app *inc = cp->app; | |
237 | ||
238 | if (!inc) | |
239 | return; | |
240 | ||
241 | if (inc->unbind_conn) | |
242 | inc->unbind_conn(inc, cp); | |
243 | if (inc->done_conn) | |
244 | inc->done_conn(inc, cp); | |
245 | ip_vs_app_inc_put(inc); | |
246 | cp->app = NULL; | |
247 | } | |
248 | ||
249 | ||
250 | /* | |
251 | * Fixes th->seq based on ip_vs_seq info. | |
252 | */ | |
253 | static inline void vs_fix_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
254 | { | |
255 | __u32 seq = ntohl(th->seq); | |
256 | ||
257 | /* | |
258 | * Adjust seq with delta-offset for all packets after | |
259 | * the most recent resized pkt seq and with previous_delta offset | |
260 | * for all packets before most recent resized pkt seq. | |
261 | */ | |
262 | if (vseq->delta || vseq->previous_delta) { | |
263 | if(after(seq, vseq->init_seq)) { | |
264 | th->seq = htonl(seq + vseq->delta); | |
265 | IP_VS_DBG(9, "vs_fix_seq(): added delta (%d) to seq\n", | |
266 | vseq->delta); | |
267 | } else { | |
268 | th->seq = htonl(seq + vseq->previous_delta); | |
269 | IP_VS_DBG(9, "vs_fix_seq(): added previous_delta " | |
270 | "(%d) to seq\n", vseq->previous_delta); | |
271 | } | |
272 | } | |
273 | } | |
274 | ||
275 | ||
276 | /* | |
277 | * Fixes th->ack_seq based on ip_vs_seq info. | |
278 | */ | |
279 | static inline void | |
280 | vs_fix_ack_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
281 | { | |
282 | __u32 ack_seq = ntohl(th->ack_seq); | |
283 | ||
284 | /* | |
285 | * Adjust ack_seq with delta-offset for | |
286 | * the packets AFTER most recent resized pkt has caused a shift | |
287 | * for packets before most recent resized pkt, use previous_delta | |
288 | */ | |
289 | if (vseq->delta || vseq->previous_delta) { | |
290 | /* since ack_seq is the number of octet that is expected | |
291 | to receive next, so compare it with init_seq+delta */ | |
292 | if(after(ack_seq, vseq->init_seq+vseq->delta)) { | |
293 | th->ack_seq = htonl(ack_seq - vseq->delta); | |
294 | IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted delta " | |
295 | "(%d) from ack_seq\n", vseq->delta); | |
296 | ||
297 | } else { | |
298 | th->ack_seq = htonl(ack_seq - vseq->previous_delta); | |
299 | IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted " | |
300 | "previous_delta (%d) from ack_seq\n", | |
301 | vseq->previous_delta); | |
302 | } | |
303 | } | |
304 | } | |
305 | ||
306 | ||
307 | /* | |
308 | * Updates ip_vs_seq if pkt has been resized | |
309 | * Assumes already checked proto==IPPROTO_TCP and diff!=0. | |
310 | */ | |
311 | static inline void vs_seq_update(struct ip_vs_conn *cp, struct ip_vs_seq *vseq, | |
312 | unsigned flag, __u32 seq, int diff) | |
313 | { | |
314 | /* spinlock is to keep updating cp->flags atomic */ | |
315 | spin_lock(&cp->lock); | |
316 | if (!(cp->flags & flag) || after(seq, vseq->init_seq)) { | |
317 | vseq->previous_delta = vseq->delta; | |
318 | vseq->delta += diff; | |
319 | vseq->init_seq = seq; | |
320 | cp->flags |= flag; | |
321 | } | |
322 | spin_unlock(&cp->lock); | |
323 | } | |
324 | ||
3db05fea | 325 | static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
326 | struct ip_vs_app *app) |
327 | { | |
328 | int diff; | |
3db05fea | 329 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
330 | struct tcphdr *th; |
331 | __u32 seq; | |
332 | ||
3db05fea | 333 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
334 | return 0; |
335 | ||
3db05fea | 336 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
337 | |
338 | /* | |
339 | * Remember seq number in case this pkt gets resized | |
340 | */ | |
341 | seq = ntohl(th->seq); | |
342 | ||
343 | /* | |
344 | * Fix seq stuff if flagged as so. | |
345 | */ | |
346 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
347 | vs_fix_seq(&cp->out_seq, th); | |
348 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
349 | vs_fix_ack_seq(&cp->in_seq, th); | |
350 | ||
351 | /* | |
352 | * Call private output hook function | |
353 | */ | |
354 | if (app->pkt_out == NULL) | |
355 | return 1; | |
356 | ||
3db05fea | 357 | if (!app->pkt_out(app, cp, skb, &diff)) |
1da177e4 LT |
358 | return 0; |
359 | ||
360 | /* | |
361 | * Update ip_vs seq stuff if len has changed. | |
362 | */ | |
363 | if (diff != 0) | |
364 | vs_seq_update(cp, &cp->out_seq, | |
365 | IP_VS_CONN_F_OUT_SEQ, seq, diff); | |
366 | ||
367 | return 1; | |
368 | } | |
369 | ||
370 | /* | |
371 | * Output pkt hook. Will call bound ip_vs_app specific function | |
372 | * called by ipvs packet handler, assumes previously checked cp!=NULL | |
373 | * returns false if it can't handle packet (oom) | |
374 | */ | |
3db05fea | 375 | int ip_vs_app_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
376 | { |
377 | struct ip_vs_app *app; | |
378 | ||
379 | /* | |
380 | * check if application module is bound to | |
381 | * this ip_vs_conn. | |
382 | */ | |
383 | if ((app = cp->app) == NULL) | |
384 | return 1; | |
385 | ||
386 | /* TCP is complicated */ | |
387 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 388 | return app_tcp_pkt_out(cp, skb, app); |
1da177e4 LT |
389 | |
390 | /* | |
391 | * Call private output hook function | |
392 | */ | |
393 | if (app->pkt_out == NULL) | |
394 | return 1; | |
395 | ||
3db05fea | 396 | return app->pkt_out(app, cp, skb, NULL); |
1da177e4 LT |
397 | } |
398 | ||
399 | ||
3db05fea | 400 | static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
401 | struct ip_vs_app *app) |
402 | { | |
403 | int diff; | |
3db05fea | 404 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
405 | struct tcphdr *th; |
406 | __u32 seq; | |
407 | ||
3db05fea | 408 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
409 | return 0; |
410 | ||
3db05fea | 411 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
412 | |
413 | /* | |
414 | * Remember seq number in case this pkt gets resized | |
415 | */ | |
416 | seq = ntohl(th->seq); | |
417 | ||
418 | /* | |
419 | * Fix seq stuff if flagged as so. | |
420 | */ | |
421 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
422 | vs_fix_seq(&cp->in_seq, th); | |
423 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
424 | vs_fix_ack_seq(&cp->out_seq, th); | |
425 | ||
426 | /* | |
427 | * Call private input hook function | |
428 | */ | |
429 | if (app->pkt_in == NULL) | |
430 | return 1; | |
431 | ||
3db05fea | 432 | if (!app->pkt_in(app, cp, skb, &diff)) |
1da177e4 LT |
433 | return 0; |
434 | ||
435 | /* | |
436 | * Update ip_vs seq stuff if len has changed. | |
437 | */ | |
438 | if (diff != 0) | |
439 | vs_seq_update(cp, &cp->in_seq, | |
440 | IP_VS_CONN_F_IN_SEQ, seq, diff); | |
441 | ||
442 | return 1; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Input pkt hook. Will call bound ip_vs_app specific function | |
447 | * called by ipvs packet handler, assumes previously checked cp!=NULL. | |
448 | * returns false if can't handle packet (oom). | |
449 | */ | |
3db05fea | 450 | int ip_vs_app_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
451 | { |
452 | struct ip_vs_app *app; | |
453 | ||
454 | /* | |
455 | * check if application module is bound to | |
456 | * this ip_vs_conn. | |
457 | */ | |
458 | if ((app = cp->app) == NULL) | |
459 | return 1; | |
460 | ||
461 | /* TCP is complicated */ | |
462 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 463 | return app_tcp_pkt_in(cp, skb, app); |
1da177e4 LT |
464 | |
465 | /* | |
466 | * Call private input hook function | |
467 | */ | |
468 | if (app->pkt_in == NULL) | |
469 | return 1; | |
470 | ||
3db05fea | 471 | return app->pkt_in(app, cp, skb, NULL); |
1da177e4 LT |
472 | } |
473 | ||
474 | ||
475 | #ifdef CONFIG_PROC_FS | |
476 | /* | |
477 | * /proc/net/ip_vs_app entry function | |
478 | */ | |
479 | ||
480 | static struct ip_vs_app *ip_vs_app_idx(loff_t pos) | |
481 | { | |
482 | struct ip_vs_app *app, *inc; | |
483 | ||
484 | list_for_each_entry(app, &ip_vs_app_list, a_list) { | |
485 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
486 | if (pos-- == 0) | |
487 | return inc; | |
488 | } | |
489 | } | |
490 | return NULL; | |
491 | ||
492 | } | |
493 | ||
494 | static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos) | |
495 | { | |
57b47a53 | 496 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
497 | |
498 | return *pos ? ip_vs_app_idx(*pos - 1) : SEQ_START_TOKEN; | |
499 | } | |
500 | ||
501 | static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
502 | { | |
503 | struct ip_vs_app *inc, *app; | |
504 | struct list_head *e; | |
505 | ||
506 | ++*pos; | |
507 | if (v == SEQ_START_TOKEN) | |
508 | return ip_vs_app_idx(0); | |
509 | ||
510 | inc = v; | |
511 | app = inc->app; | |
512 | ||
513 | if ((e = inc->a_list.next) != &app->incs_list) | |
514 | return list_entry(e, struct ip_vs_app, a_list); | |
515 | ||
516 | /* go on to next application */ | |
517 | for (e = app->a_list.next; e != &ip_vs_app_list; e = e->next) { | |
518 | app = list_entry(e, struct ip_vs_app, a_list); | |
519 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
520 | return inc; | |
521 | } | |
522 | } | |
523 | return NULL; | |
524 | } | |
525 | ||
526 | static void ip_vs_app_seq_stop(struct seq_file *seq, void *v) | |
527 | { | |
57b47a53 | 528 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
529 | } |
530 | ||
531 | static int ip_vs_app_seq_show(struct seq_file *seq, void *v) | |
532 | { | |
533 | if (v == SEQ_START_TOKEN) | |
534 | seq_puts(seq, "prot port usecnt name\n"); | |
535 | else { | |
536 | const struct ip_vs_app *inc = v; | |
537 | ||
538 | seq_printf(seq, "%-3s %-7u %-6d %-17s\n", | |
539 | ip_vs_proto_name(inc->protocol), | |
540 | ntohs(inc->port), | |
541 | atomic_read(&inc->usecnt), | |
542 | inc->name); | |
543 | } | |
544 | return 0; | |
545 | } | |
546 | ||
56b3d975 | 547 | static const struct seq_operations ip_vs_app_seq_ops = { |
1da177e4 LT |
548 | .start = ip_vs_app_seq_start, |
549 | .next = ip_vs_app_seq_next, | |
550 | .stop = ip_vs_app_seq_stop, | |
551 | .show = ip_vs_app_seq_show, | |
552 | }; | |
553 | ||
554 | static int ip_vs_app_open(struct inode *inode, struct file *file) | |
555 | { | |
556 | return seq_open(file, &ip_vs_app_seq_ops); | |
557 | } | |
558 | ||
9a32144e | 559 | static const struct file_operations ip_vs_app_fops = { |
1da177e4 LT |
560 | .owner = THIS_MODULE, |
561 | .open = ip_vs_app_open, | |
562 | .read = seq_read, | |
563 | .llseek = seq_lseek, | |
564 | .release = seq_release, | |
565 | }; | |
566 | #endif | |
567 | ||
568 | ||
569 | /* | |
570 | * Replace a segment of data with a new segment | |
571 | */ | |
dd0fc66f | 572 | int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
1da177e4 LT |
573 | char *o_buf, int o_len, char *n_buf, int n_len) |
574 | { | |
1da177e4 LT |
575 | int diff; |
576 | int o_offset; | |
577 | int o_left; | |
578 | ||
579 | EnterFunction(9); | |
580 | ||
581 | diff = n_len - o_len; | |
582 | o_offset = o_buf - (char *)skb->data; | |
583 | /* The length of left data after o_buf+o_len in the skb data */ | |
584 | o_left = skb->len - (o_offset + o_len); | |
585 | ||
586 | if (diff <= 0) { | |
587 | memmove(o_buf + n_len, o_buf + o_len, o_left); | |
588 | memcpy(o_buf, n_buf, n_len); | |
589 | skb_trim(skb, skb->len + diff); | |
590 | } else if (diff <= skb_tailroom(skb)) { | |
591 | skb_put(skb, diff); | |
592 | memmove(o_buf + n_len, o_buf + o_len, o_left); | |
593 | memcpy(o_buf, n_buf, n_len); | |
594 | } else { | |
595 | if (pskb_expand_head(skb, skb_headroom(skb), diff, pri)) | |
596 | return -ENOMEM; | |
597 | skb_put(skb, diff); | |
598 | memmove(skb->data + o_offset + n_len, | |
599 | skb->data + o_offset + o_len, o_left); | |
27d7ff46 | 600 | skb_copy_to_linear_data_offset(skb, o_offset, n_buf, n_len); |
1da177e4 LT |
601 | } |
602 | ||
603 | /* must update the iph total length here */ | |
eddc9ec5 | 604 | ip_hdr(skb)->tot_len = htons(skb->len); |
1da177e4 LT |
605 | |
606 | LeaveFunction(9); | |
607 | return 0; | |
608 | } | |
609 | ||
610 | ||
611 | int ip_vs_app_init(void) | |
612 | { | |
613 | /* we will replace it with proc_net_ipvs_create() soon */ | |
457c4cbc | 614 | proc_net_fops_create(&init_net, "ip_vs_app", 0, &ip_vs_app_fops); |
1da177e4 LT |
615 | return 0; |
616 | } | |
617 | ||
618 | ||
619 | void ip_vs_app_cleanup(void) | |
620 | { | |
457c4cbc | 621 | proc_net_remove(&init_net, "ip_vs_app"); |
1da177e4 | 622 | } |