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1da177e4 LT |
1 | /* |
2 | * ip_vs_app.c: Application module support for IPVS | |
3 | * | |
4 | * Version: $Id: ip_vs_app.c,v 1.17 2003/03/22 06:31:21 wensong Exp $ | |
5 | * | |
6 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Most code here is taken from ip_masq_app.c in kernel 2.2. The difference | |
14 | * is that ip_vs_app module handles the reverse direction (incoming requests | |
15 | * and outgoing responses). | |
16 | * | |
17 | * IP_MASQ_APP application masquerading module | |
18 | * | |
19 | * Author: Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar> | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/ip.h> | |
af1e1cf0 | 28 | #include <linux/netfilter.h> |
457c4cbc | 29 | #include <net/net_namespace.h> |
1da177e4 | 30 | #include <net/protocol.h> |
c752f073 | 31 | #include <net/tcp.h> |
1da177e4 LT |
32 | #include <asm/system.h> |
33 | #include <linux/stat.h> | |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/seq_file.h> | |
57b47a53 | 36 | #include <linux/mutex.h> |
1da177e4 LT |
37 | |
38 | #include <net/ip_vs.h> | |
39 | ||
40 | EXPORT_SYMBOL(register_ip_vs_app); | |
41 | EXPORT_SYMBOL(unregister_ip_vs_app); | |
42 | EXPORT_SYMBOL(register_ip_vs_app_inc); | |
43 | ||
44 | /* ipvs application list head */ | |
45 | static LIST_HEAD(ip_vs_app_list); | |
57b47a53 | 46 | static DEFINE_MUTEX(__ip_vs_app_mutex); |
1da177e4 LT |
47 | |
48 | ||
49 | /* | |
50 | * Get an ip_vs_app object | |
51 | */ | |
52 | static inline int ip_vs_app_get(struct ip_vs_app *app) | |
53 | { | |
54 | /* test and get the module atomically */ | |
55 | if (app->module) | |
56 | return try_module_get(app->module); | |
57 | else | |
58 | return 1; | |
59 | } | |
60 | ||
61 | ||
62 | static inline void ip_vs_app_put(struct ip_vs_app *app) | |
63 | { | |
64 | if (app->module) | |
65 | module_put(app->module); | |
66 | } | |
67 | ||
68 | ||
69 | /* | |
70 | * Allocate/initialize app incarnation and register it in proto apps. | |
71 | */ | |
72 | static int | |
73 | ip_vs_app_inc_new(struct ip_vs_app *app, __u16 proto, __u16 port) | |
74 | { | |
75 | struct ip_vs_protocol *pp; | |
76 | struct ip_vs_app *inc; | |
77 | int ret; | |
78 | ||
79 | if (!(pp = ip_vs_proto_get(proto))) | |
80 | return -EPROTONOSUPPORT; | |
81 | ||
82 | if (!pp->unregister_app) | |
83 | return -EOPNOTSUPP; | |
84 | ||
8b2ed4bb | 85 | inc = kmemdup(app, sizeof(*inc), GFP_KERNEL); |
1da177e4 LT |
86 | if (!inc) |
87 | return -ENOMEM; | |
1da177e4 LT |
88 | INIT_LIST_HEAD(&inc->p_list); |
89 | INIT_LIST_HEAD(&inc->incs_list); | |
90 | inc->app = app; | |
91 | inc->port = htons(port); | |
92 | atomic_set(&inc->usecnt, 0); | |
93 | ||
94 | if (app->timeouts) { | |
95 | inc->timeout_table = | |
96 | ip_vs_create_timeout_table(app->timeouts, | |
97 | app->timeouts_size); | |
98 | if (!inc->timeout_table) { | |
99 | ret = -ENOMEM; | |
100 | goto out; | |
101 | } | |
102 | } | |
103 | ||
104 | ret = pp->register_app(inc); | |
105 | if (ret) | |
106 | goto out; | |
107 | ||
108 | list_add(&inc->a_list, &app->incs_list); | |
109 | IP_VS_DBG(9, "%s application %s:%u registered\n", | |
110 | pp->name, inc->name, inc->port); | |
111 | ||
112 | return 0; | |
113 | ||
114 | out: | |
a51482bd | 115 | kfree(inc->timeout_table); |
1da177e4 LT |
116 | kfree(inc); |
117 | return ret; | |
118 | } | |
119 | ||
120 | ||
121 | /* | |
122 | * Release app incarnation | |
123 | */ | |
124 | static void | |
125 | ip_vs_app_inc_release(struct ip_vs_app *inc) | |
126 | { | |
127 | struct ip_vs_protocol *pp; | |
128 | ||
129 | if (!(pp = ip_vs_proto_get(inc->protocol))) | |
130 | return; | |
131 | ||
132 | if (pp->unregister_app) | |
133 | pp->unregister_app(inc); | |
134 | ||
135 | IP_VS_DBG(9, "%s App %s:%u unregistered\n", | |
136 | pp->name, inc->name, inc->port); | |
137 | ||
138 | list_del(&inc->a_list); | |
139 | ||
a51482bd | 140 | kfree(inc->timeout_table); |
1da177e4 LT |
141 | kfree(inc); |
142 | } | |
143 | ||
144 | ||
145 | /* | |
146 | * Get reference to app inc (only called from softirq) | |
147 | * | |
148 | */ | |
149 | int ip_vs_app_inc_get(struct ip_vs_app *inc) | |
150 | { | |
151 | int result; | |
152 | ||
153 | atomic_inc(&inc->usecnt); | |
154 | if (unlikely((result = ip_vs_app_get(inc->app)) != 1)) | |
155 | atomic_dec(&inc->usecnt); | |
156 | return result; | |
157 | } | |
158 | ||
159 | ||
160 | /* | |
161 | * Put the app inc (only called from timer or net softirq) | |
162 | */ | |
163 | void ip_vs_app_inc_put(struct ip_vs_app *inc) | |
164 | { | |
165 | ip_vs_app_put(inc->app); | |
166 | atomic_dec(&inc->usecnt); | |
167 | } | |
168 | ||
169 | ||
170 | /* | |
171 | * Register an application incarnation in protocol applications | |
172 | */ | |
173 | int | |
174 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port) | |
175 | { | |
176 | int result; | |
177 | ||
57b47a53 | 178 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
179 | |
180 | result = ip_vs_app_inc_new(app, proto, port); | |
181 | ||
57b47a53 | 182 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
183 | |
184 | return result; | |
185 | } | |
186 | ||
187 | ||
188 | /* | |
189 | * ip_vs_app registration routine | |
190 | */ | |
191 | int register_ip_vs_app(struct ip_vs_app *app) | |
192 | { | |
193 | /* increase the module use count */ | |
194 | ip_vs_use_count_inc(); | |
195 | ||
57b47a53 | 196 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
197 | |
198 | list_add(&app->a_list, &ip_vs_app_list); | |
199 | ||
57b47a53 | 200 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
201 | |
202 | return 0; | |
203 | } | |
204 | ||
205 | ||
206 | /* | |
207 | * ip_vs_app unregistration routine | |
208 | * We are sure there are no app incarnations attached to services | |
209 | */ | |
210 | void unregister_ip_vs_app(struct ip_vs_app *app) | |
211 | { | |
212 | struct ip_vs_app *inc, *nxt; | |
213 | ||
57b47a53 | 214 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
215 | |
216 | list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) { | |
217 | ip_vs_app_inc_release(inc); | |
218 | } | |
219 | ||
220 | list_del(&app->a_list); | |
221 | ||
57b47a53 | 222 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
223 | |
224 | /* decrease the module use count */ | |
225 | ip_vs_use_count_dec(); | |
226 | } | |
227 | ||
228 | ||
1da177e4 LT |
229 | /* |
230 | * Bind ip_vs_conn to its ip_vs_app (called by cp constructor) | |
231 | */ | |
232 | int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp) | |
233 | { | |
234 | return pp->app_conn_bind(cp); | |
235 | } | |
236 | ||
237 | ||
238 | /* | |
239 | * Unbind cp from application incarnation (called by cp destructor) | |
240 | */ | |
241 | void ip_vs_unbind_app(struct ip_vs_conn *cp) | |
242 | { | |
243 | struct ip_vs_app *inc = cp->app; | |
244 | ||
245 | if (!inc) | |
246 | return; | |
247 | ||
248 | if (inc->unbind_conn) | |
249 | inc->unbind_conn(inc, cp); | |
250 | if (inc->done_conn) | |
251 | inc->done_conn(inc, cp); | |
252 | ip_vs_app_inc_put(inc); | |
253 | cp->app = NULL; | |
254 | } | |
255 | ||
256 | ||
257 | /* | |
258 | * Fixes th->seq based on ip_vs_seq info. | |
259 | */ | |
260 | static inline void vs_fix_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
261 | { | |
262 | __u32 seq = ntohl(th->seq); | |
263 | ||
264 | /* | |
265 | * Adjust seq with delta-offset for all packets after | |
266 | * the most recent resized pkt seq and with previous_delta offset | |
267 | * for all packets before most recent resized pkt seq. | |
268 | */ | |
269 | if (vseq->delta || vseq->previous_delta) { | |
270 | if(after(seq, vseq->init_seq)) { | |
271 | th->seq = htonl(seq + vseq->delta); | |
272 | IP_VS_DBG(9, "vs_fix_seq(): added delta (%d) to seq\n", | |
273 | vseq->delta); | |
274 | } else { | |
275 | th->seq = htonl(seq + vseq->previous_delta); | |
276 | IP_VS_DBG(9, "vs_fix_seq(): added previous_delta " | |
277 | "(%d) to seq\n", vseq->previous_delta); | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | ||
283 | /* | |
284 | * Fixes th->ack_seq based on ip_vs_seq info. | |
285 | */ | |
286 | static inline void | |
287 | vs_fix_ack_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
288 | { | |
289 | __u32 ack_seq = ntohl(th->ack_seq); | |
290 | ||
291 | /* | |
292 | * Adjust ack_seq with delta-offset for | |
293 | * the packets AFTER most recent resized pkt has caused a shift | |
294 | * for packets before most recent resized pkt, use previous_delta | |
295 | */ | |
296 | if (vseq->delta || vseq->previous_delta) { | |
297 | /* since ack_seq is the number of octet that is expected | |
298 | to receive next, so compare it with init_seq+delta */ | |
299 | if(after(ack_seq, vseq->init_seq+vseq->delta)) { | |
300 | th->ack_seq = htonl(ack_seq - vseq->delta); | |
301 | IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted delta " | |
302 | "(%d) from ack_seq\n", vseq->delta); | |
303 | ||
304 | } else { | |
305 | th->ack_seq = htonl(ack_seq - vseq->previous_delta); | |
306 | IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted " | |
307 | "previous_delta (%d) from ack_seq\n", | |
308 | vseq->previous_delta); | |
309 | } | |
310 | } | |
311 | } | |
312 | ||
313 | ||
314 | /* | |
315 | * Updates ip_vs_seq if pkt has been resized | |
316 | * Assumes already checked proto==IPPROTO_TCP and diff!=0. | |
317 | */ | |
318 | static inline void vs_seq_update(struct ip_vs_conn *cp, struct ip_vs_seq *vseq, | |
319 | unsigned flag, __u32 seq, int diff) | |
320 | { | |
321 | /* spinlock is to keep updating cp->flags atomic */ | |
322 | spin_lock(&cp->lock); | |
323 | if (!(cp->flags & flag) || after(seq, vseq->init_seq)) { | |
324 | vseq->previous_delta = vseq->delta; | |
325 | vseq->delta += diff; | |
326 | vseq->init_seq = seq; | |
327 | cp->flags |= flag; | |
328 | } | |
329 | spin_unlock(&cp->lock); | |
330 | } | |
331 | ||
3db05fea | 332 | static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
333 | struct ip_vs_app *app) |
334 | { | |
335 | int diff; | |
3db05fea | 336 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
337 | struct tcphdr *th; |
338 | __u32 seq; | |
339 | ||
3db05fea | 340 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
341 | return 0; |
342 | ||
3db05fea | 343 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
344 | |
345 | /* | |
346 | * Remember seq number in case this pkt gets resized | |
347 | */ | |
348 | seq = ntohl(th->seq); | |
349 | ||
350 | /* | |
351 | * Fix seq stuff if flagged as so. | |
352 | */ | |
353 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
354 | vs_fix_seq(&cp->out_seq, th); | |
355 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
356 | vs_fix_ack_seq(&cp->in_seq, th); | |
357 | ||
358 | /* | |
359 | * Call private output hook function | |
360 | */ | |
361 | if (app->pkt_out == NULL) | |
362 | return 1; | |
363 | ||
3db05fea | 364 | if (!app->pkt_out(app, cp, skb, &diff)) |
1da177e4 LT |
365 | return 0; |
366 | ||
367 | /* | |
368 | * Update ip_vs seq stuff if len has changed. | |
369 | */ | |
370 | if (diff != 0) | |
371 | vs_seq_update(cp, &cp->out_seq, | |
372 | IP_VS_CONN_F_OUT_SEQ, seq, diff); | |
373 | ||
374 | return 1; | |
375 | } | |
376 | ||
377 | /* | |
378 | * Output pkt hook. Will call bound ip_vs_app specific function | |
379 | * called by ipvs packet handler, assumes previously checked cp!=NULL | |
380 | * returns false if it can't handle packet (oom) | |
381 | */ | |
3db05fea | 382 | int ip_vs_app_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
383 | { |
384 | struct ip_vs_app *app; | |
385 | ||
386 | /* | |
387 | * check if application module is bound to | |
388 | * this ip_vs_conn. | |
389 | */ | |
390 | if ((app = cp->app) == NULL) | |
391 | return 1; | |
392 | ||
393 | /* TCP is complicated */ | |
394 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 395 | return app_tcp_pkt_out(cp, skb, app); |
1da177e4 LT |
396 | |
397 | /* | |
398 | * Call private output hook function | |
399 | */ | |
400 | if (app->pkt_out == NULL) | |
401 | return 1; | |
402 | ||
3db05fea | 403 | return app->pkt_out(app, cp, skb, NULL); |
1da177e4 LT |
404 | } |
405 | ||
406 | ||
3db05fea | 407 | static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
408 | struct ip_vs_app *app) |
409 | { | |
410 | int diff; | |
3db05fea | 411 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
412 | struct tcphdr *th; |
413 | __u32 seq; | |
414 | ||
3db05fea | 415 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
416 | return 0; |
417 | ||
3db05fea | 418 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
419 | |
420 | /* | |
421 | * Remember seq number in case this pkt gets resized | |
422 | */ | |
423 | seq = ntohl(th->seq); | |
424 | ||
425 | /* | |
426 | * Fix seq stuff if flagged as so. | |
427 | */ | |
428 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
429 | vs_fix_seq(&cp->in_seq, th); | |
430 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
431 | vs_fix_ack_seq(&cp->out_seq, th); | |
432 | ||
433 | /* | |
434 | * Call private input hook function | |
435 | */ | |
436 | if (app->pkt_in == NULL) | |
437 | return 1; | |
438 | ||
3db05fea | 439 | if (!app->pkt_in(app, cp, skb, &diff)) |
1da177e4 LT |
440 | return 0; |
441 | ||
442 | /* | |
443 | * Update ip_vs seq stuff if len has changed. | |
444 | */ | |
445 | if (diff != 0) | |
446 | vs_seq_update(cp, &cp->in_seq, | |
447 | IP_VS_CONN_F_IN_SEQ, seq, diff); | |
448 | ||
449 | return 1; | |
450 | } | |
451 | ||
452 | /* | |
453 | * Input pkt hook. Will call bound ip_vs_app specific function | |
454 | * called by ipvs packet handler, assumes previously checked cp!=NULL. | |
455 | * returns false if can't handle packet (oom). | |
456 | */ | |
3db05fea | 457 | int ip_vs_app_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
458 | { |
459 | struct ip_vs_app *app; | |
460 | ||
461 | /* | |
462 | * check if application module is bound to | |
463 | * this ip_vs_conn. | |
464 | */ | |
465 | if ((app = cp->app) == NULL) | |
466 | return 1; | |
467 | ||
468 | /* TCP is complicated */ | |
469 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 470 | return app_tcp_pkt_in(cp, skb, app); |
1da177e4 LT |
471 | |
472 | /* | |
473 | * Call private input hook function | |
474 | */ | |
475 | if (app->pkt_in == NULL) | |
476 | return 1; | |
477 | ||
3db05fea | 478 | return app->pkt_in(app, cp, skb, NULL); |
1da177e4 LT |
479 | } |
480 | ||
481 | ||
482 | #ifdef CONFIG_PROC_FS | |
483 | /* | |
484 | * /proc/net/ip_vs_app entry function | |
485 | */ | |
486 | ||
487 | static struct ip_vs_app *ip_vs_app_idx(loff_t pos) | |
488 | { | |
489 | struct ip_vs_app *app, *inc; | |
490 | ||
491 | list_for_each_entry(app, &ip_vs_app_list, a_list) { | |
492 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
493 | if (pos-- == 0) | |
494 | return inc; | |
495 | } | |
496 | } | |
497 | return NULL; | |
498 | ||
499 | } | |
500 | ||
501 | static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos) | |
502 | { | |
57b47a53 | 503 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
504 | |
505 | return *pos ? ip_vs_app_idx(*pos - 1) : SEQ_START_TOKEN; | |
506 | } | |
507 | ||
508 | static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
509 | { | |
510 | struct ip_vs_app *inc, *app; | |
511 | struct list_head *e; | |
512 | ||
513 | ++*pos; | |
514 | if (v == SEQ_START_TOKEN) | |
515 | return ip_vs_app_idx(0); | |
516 | ||
517 | inc = v; | |
518 | app = inc->app; | |
519 | ||
520 | if ((e = inc->a_list.next) != &app->incs_list) | |
521 | return list_entry(e, struct ip_vs_app, a_list); | |
522 | ||
523 | /* go on to next application */ | |
524 | for (e = app->a_list.next; e != &ip_vs_app_list; e = e->next) { | |
525 | app = list_entry(e, struct ip_vs_app, a_list); | |
526 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
527 | return inc; | |
528 | } | |
529 | } | |
530 | return NULL; | |
531 | } | |
532 | ||
533 | static void ip_vs_app_seq_stop(struct seq_file *seq, void *v) | |
534 | { | |
57b47a53 | 535 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
536 | } |
537 | ||
538 | static int ip_vs_app_seq_show(struct seq_file *seq, void *v) | |
539 | { | |
540 | if (v == SEQ_START_TOKEN) | |
541 | seq_puts(seq, "prot port usecnt name\n"); | |
542 | else { | |
543 | const struct ip_vs_app *inc = v; | |
544 | ||
545 | seq_printf(seq, "%-3s %-7u %-6d %-17s\n", | |
546 | ip_vs_proto_name(inc->protocol), | |
547 | ntohs(inc->port), | |
548 | atomic_read(&inc->usecnt), | |
549 | inc->name); | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
56b3d975 | 554 | static const struct seq_operations ip_vs_app_seq_ops = { |
1da177e4 LT |
555 | .start = ip_vs_app_seq_start, |
556 | .next = ip_vs_app_seq_next, | |
557 | .stop = ip_vs_app_seq_stop, | |
558 | .show = ip_vs_app_seq_show, | |
559 | }; | |
560 | ||
561 | static int ip_vs_app_open(struct inode *inode, struct file *file) | |
562 | { | |
563 | return seq_open(file, &ip_vs_app_seq_ops); | |
564 | } | |
565 | ||
9a32144e | 566 | static const struct file_operations ip_vs_app_fops = { |
1da177e4 LT |
567 | .owner = THIS_MODULE, |
568 | .open = ip_vs_app_open, | |
569 | .read = seq_read, | |
570 | .llseek = seq_lseek, | |
571 | .release = seq_release, | |
572 | }; | |
573 | #endif | |
574 | ||
575 | ||
576 | /* | |
577 | * Replace a segment of data with a new segment | |
578 | */ | |
dd0fc66f | 579 | int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
1da177e4 LT |
580 | char *o_buf, int o_len, char *n_buf, int n_len) |
581 | { | |
1da177e4 LT |
582 | int diff; |
583 | int o_offset; | |
584 | int o_left; | |
585 | ||
586 | EnterFunction(9); | |
587 | ||
588 | diff = n_len - o_len; | |
589 | o_offset = o_buf - (char *)skb->data; | |
590 | /* The length of left data after o_buf+o_len in the skb data */ | |
591 | o_left = skb->len - (o_offset + o_len); | |
592 | ||
593 | if (diff <= 0) { | |
594 | memmove(o_buf + n_len, o_buf + o_len, o_left); | |
595 | memcpy(o_buf, n_buf, n_len); | |
596 | skb_trim(skb, skb->len + diff); | |
597 | } else if (diff <= skb_tailroom(skb)) { | |
598 | skb_put(skb, diff); | |
599 | memmove(o_buf + n_len, o_buf + o_len, o_left); | |
600 | memcpy(o_buf, n_buf, n_len); | |
601 | } else { | |
602 | if (pskb_expand_head(skb, skb_headroom(skb), diff, pri)) | |
603 | return -ENOMEM; | |
604 | skb_put(skb, diff); | |
605 | memmove(skb->data + o_offset + n_len, | |
606 | skb->data + o_offset + o_len, o_left); | |
27d7ff46 | 607 | skb_copy_to_linear_data_offset(skb, o_offset, n_buf, n_len); |
1da177e4 LT |
608 | } |
609 | ||
610 | /* must update the iph total length here */ | |
eddc9ec5 | 611 | ip_hdr(skb)->tot_len = htons(skb->len); |
1da177e4 LT |
612 | |
613 | LeaveFunction(9); | |
614 | return 0; | |
615 | } | |
616 | ||
617 | ||
618 | int ip_vs_app_init(void) | |
619 | { | |
620 | /* we will replace it with proc_net_ipvs_create() soon */ | |
457c4cbc | 621 | proc_net_fops_create(&init_net, "ip_vs_app", 0, &ip_vs_app_fops); |
1da177e4 LT |
622 | return 0; |
623 | } | |
624 | ||
625 | ||
626 | void ip_vs_app_cleanup(void) | |
627 | { | |
457c4cbc | 628 | proc_net_remove(&init_net, "ip_vs_app"); |
1da177e4 | 629 | } |