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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> |
457c4cbc | 30 | #include <net/net_namespace.h> |
1da177e4 | 31 | #include <net/protocol.h> |
c752f073 | 32 | #include <net/tcp.h> |
1da177e4 LT |
33 | #include <asm/system.h> |
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 | ||
45 | /* ipvs application list head */ | |
46 | static LIST_HEAD(ip_vs_app_list); | |
57b47a53 | 47 | static DEFINE_MUTEX(__ip_vs_app_mutex); |
1da177e4 LT |
48 | |
49 | ||
50 | /* | |
51 | * Get an ip_vs_app object | |
52 | */ | |
53 | static inline int ip_vs_app_get(struct ip_vs_app *app) | |
54 | { | |
85b60680 | 55 | return try_module_get(app->module); |
1da177e4 LT |
56 | } |
57 | ||
58 | ||
59 | static inline void ip_vs_app_put(struct ip_vs_app *app) | |
60 | { | |
85b60680 | 61 | module_put(app->module); |
1da177e4 LT |
62 | } |
63 | ||
64 | ||
65 | /* | |
66 | * Allocate/initialize app incarnation and register it in proto apps. | |
67 | */ | |
68 | static int | |
69 | ip_vs_app_inc_new(struct ip_vs_app *app, __u16 proto, __u16 port) | |
70 | { | |
71 | struct ip_vs_protocol *pp; | |
72 | struct ip_vs_app *inc; | |
73 | int ret; | |
74 | ||
75 | if (!(pp = ip_vs_proto_get(proto))) | |
76 | return -EPROTONOSUPPORT; | |
77 | ||
78 | if (!pp->unregister_app) | |
79 | return -EOPNOTSUPP; | |
80 | ||
8b2ed4bb | 81 | inc = kmemdup(app, sizeof(*inc), GFP_KERNEL); |
1da177e4 LT |
82 | if (!inc) |
83 | return -ENOMEM; | |
1da177e4 LT |
84 | INIT_LIST_HEAD(&inc->p_list); |
85 | INIT_LIST_HEAD(&inc->incs_list); | |
86 | inc->app = app; | |
87 | inc->port = htons(port); | |
88 | atomic_set(&inc->usecnt, 0); | |
89 | ||
90 | if (app->timeouts) { | |
91 | inc->timeout_table = | |
92 | ip_vs_create_timeout_table(app->timeouts, | |
93 | app->timeouts_size); | |
94 | if (!inc->timeout_table) { | |
95 | ret = -ENOMEM; | |
96 | goto out; | |
97 | } | |
98 | } | |
99 | ||
100 | ret = pp->register_app(inc); | |
101 | if (ret) | |
102 | goto out; | |
103 | ||
104 | list_add(&inc->a_list, &app->incs_list); | |
105 | IP_VS_DBG(9, "%s application %s:%u registered\n", | |
106 | pp->name, inc->name, inc->port); | |
107 | ||
108 | return 0; | |
109 | ||
110 | out: | |
a51482bd | 111 | kfree(inc->timeout_table); |
1da177e4 LT |
112 | kfree(inc); |
113 | return ret; | |
114 | } | |
115 | ||
116 | ||
117 | /* | |
118 | * Release app incarnation | |
119 | */ | |
120 | static void | |
121 | ip_vs_app_inc_release(struct ip_vs_app *inc) | |
122 | { | |
123 | struct ip_vs_protocol *pp; | |
124 | ||
125 | if (!(pp = ip_vs_proto_get(inc->protocol))) | |
126 | return; | |
127 | ||
128 | if (pp->unregister_app) | |
129 | pp->unregister_app(inc); | |
130 | ||
131 | IP_VS_DBG(9, "%s App %s:%u unregistered\n", | |
132 | pp->name, inc->name, inc->port); | |
133 | ||
134 | list_del(&inc->a_list); | |
135 | ||
a51482bd | 136 | kfree(inc->timeout_table); |
1da177e4 LT |
137 | kfree(inc); |
138 | } | |
139 | ||
140 | ||
141 | /* | |
142 | * Get reference to app inc (only called from softirq) | |
143 | * | |
144 | */ | |
145 | int ip_vs_app_inc_get(struct ip_vs_app *inc) | |
146 | { | |
147 | int result; | |
148 | ||
149 | atomic_inc(&inc->usecnt); | |
150 | if (unlikely((result = ip_vs_app_get(inc->app)) != 1)) | |
151 | atomic_dec(&inc->usecnt); | |
152 | return result; | |
153 | } | |
154 | ||
155 | ||
156 | /* | |
157 | * Put the app inc (only called from timer or net softirq) | |
158 | */ | |
159 | void ip_vs_app_inc_put(struct ip_vs_app *inc) | |
160 | { | |
161 | ip_vs_app_put(inc->app); | |
162 | atomic_dec(&inc->usecnt); | |
163 | } | |
164 | ||
165 | ||
166 | /* | |
167 | * Register an application incarnation in protocol applications | |
168 | */ | |
169 | int | |
170 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port) | |
171 | { | |
172 | int result; | |
173 | ||
57b47a53 | 174 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
175 | |
176 | result = ip_vs_app_inc_new(app, proto, port); | |
177 | ||
57b47a53 | 178 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
179 | |
180 | return result; | |
181 | } | |
182 | ||
183 | ||
184 | /* | |
185 | * ip_vs_app registration routine | |
186 | */ | |
187 | int register_ip_vs_app(struct ip_vs_app *app) | |
188 | { | |
189 | /* increase the module use count */ | |
190 | ip_vs_use_count_inc(); | |
191 | ||
57b47a53 | 192 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
193 | |
194 | list_add(&app->a_list, &ip_vs_app_list); | |
195 | ||
57b47a53 | 196 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
201 | ||
202 | /* | |
203 | * ip_vs_app unregistration routine | |
204 | * We are sure there are no app incarnations attached to services | |
205 | */ | |
206 | void unregister_ip_vs_app(struct ip_vs_app *app) | |
207 | { | |
208 | struct ip_vs_app *inc, *nxt; | |
209 | ||
57b47a53 | 210 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
211 | |
212 | list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) { | |
213 | ip_vs_app_inc_release(inc); | |
214 | } | |
215 | ||
216 | list_del(&app->a_list); | |
217 | ||
57b47a53 | 218 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
219 | |
220 | /* decrease the module use count */ | |
221 | ip_vs_use_count_dec(); | |
222 | } | |
223 | ||
224 | ||
1da177e4 LT |
225 | /* |
226 | * Bind ip_vs_conn to its ip_vs_app (called by cp constructor) | |
227 | */ | |
228 | int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp) | |
229 | { | |
230 | return pp->app_conn_bind(cp); | |
231 | } | |
232 | ||
233 | ||
234 | /* | |
235 | * Unbind cp from application incarnation (called by cp destructor) | |
236 | */ | |
237 | void ip_vs_unbind_app(struct ip_vs_conn *cp) | |
238 | { | |
239 | struct ip_vs_app *inc = cp->app; | |
240 | ||
241 | if (!inc) | |
242 | return; | |
243 | ||
244 | if (inc->unbind_conn) | |
245 | inc->unbind_conn(inc, cp); | |
246 | if (inc->done_conn) | |
247 | inc->done_conn(inc, cp); | |
248 | ip_vs_app_inc_put(inc); | |
249 | cp->app = NULL; | |
250 | } | |
251 | ||
252 | ||
253 | /* | |
254 | * Fixes th->seq based on ip_vs_seq info. | |
255 | */ | |
256 | static inline void vs_fix_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
257 | { | |
258 | __u32 seq = ntohl(th->seq); | |
259 | ||
260 | /* | |
261 | * Adjust seq with delta-offset for all packets after | |
262 | * the most recent resized pkt seq and with previous_delta offset | |
263 | * for all packets before most recent resized pkt seq. | |
264 | */ | |
265 | if (vseq->delta || vseq->previous_delta) { | |
266 | if(after(seq, vseq->init_seq)) { | |
267 | th->seq = htonl(seq + vseq->delta); | |
268 | IP_VS_DBG(9, "vs_fix_seq(): added delta (%d) to seq\n", | |
269 | vseq->delta); | |
270 | } else { | |
271 | th->seq = htonl(seq + vseq->previous_delta); | |
272 | IP_VS_DBG(9, "vs_fix_seq(): added previous_delta " | |
273 | "(%d) to seq\n", vseq->previous_delta); | |
274 | } | |
275 | } | |
276 | } | |
277 | ||
278 | ||
279 | /* | |
280 | * Fixes th->ack_seq based on ip_vs_seq info. | |
281 | */ | |
282 | static inline void | |
283 | vs_fix_ack_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) | |
284 | { | |
285 | __u32 ack_seq = ntohl(th->ack_seq); | |
286 | ||
287 | /* | |
288 | * Adjust ack_seq with delta-offset for | |
289 | * the packets AFTER most recent resized pkt has caused a shift | |
290 | * for packets before most recent resized pkt, use previous_delta | |
291 | */ | |
292 | if (vseq->delta || vseq->previous_delta) { | |
293 | /* since ack_seq is the number of octet that is expected | |
294 | to receive next, so compare it with init_seq+delta */ | |
295 | if(after(ack_seq, vseq->init_seq+vseq->delta)) { | |
296 | th->ack_seq = htonl(ack_seq - vseq->delta); | |
297 | IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted delta " | |
298 | "(%d) from ack_seq\n", vseq->delta); | |
299 | ||
300 | } else { | |
301 | th->ack_seq = htonl(ack_seq - vseq->previous_delta); | |
302 | IP_VS_DBG(9, "vs_fix_ack_seq(): subtracted " | |
303 | "previous_delta (%d) from ack_seq\n", | |
304 | vseq->previous_delta); | |
305 | } | |
306 | } | |
307 | } | |
308 | ||
309 | ||
310 | /* | |
311 | * Updates ip_vs_seq if pkt has been resized | |
312 | * Assumes already checked proto==IPPROTO_TCP and diff!=0. | |
313 | */ | |
314 | static inline void vs_seq_update(struct ip_vs_conn *cp, struct ip_vs_seq *vseq, | |
315 | unsigned flag, __u32 seq, int diff) | |
316 | { | |
317 | /* spinlock is to keep updating cp->flags atomic */ | |
318 | spin_lock(&cp->lock); | |
319 | if (!(cp->flags & flag) || after(seq, vseq->init_seq)) { | |
320 | vseq->previous_delta = vseq->delta; | |
321 | vseq->delta += diff; | |
322 | vseq->init_seq = seq; | |
323 | cp->flags |= flag; | |
324 | } | |
325 | spin_unlock(&cp->lock); | |
326 | } | |
327 | ||
3db05fea | 328 | static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
329 | struct ip_vs_app *app) |
330 | { | |
331 | int diff; | |
3db05fea | 332 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
333 | struct tcphdr *th; |
334 | __u32 seq; | |
335 | ||
3db05fea | 336 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
337 | return 0; |
338 | ||
3db05fea | 339 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
340 | |
341 | /* | |
342 | * Remember seq number in case this pkt gets resized | |
343 | */ | |
344 | seq = ntohl(th->seq); | |
345 | ||
346 | /* | |
347 | * Fix seq stuff if flagged as so. | |
348 | */ | |
349 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
350 | vs_fix_seq(&cp->out_seq, th); | |
351 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
352 | vs_fix_ack_seq(&cp->in_seq, th); | |
353 | ||
354 | /* | |
355 | * Call private output hook function | |
356 | */ | |
357 | if (app->pkt_out == NULL) | |
358 | return 1; | |
359 | ||
3db05fea | 360 | if (!app->pkt_out(app, cp, skb, &diff)) |
1da177e4 LT |
361 | return 0; |
362 | ||
363 | /* | |
364 | * Update ip_vs seq stuff if len has changed. | |
365 | */ | |
366 | if (diff != 0) | |
367 | vs_seq_update(cp, &cp->out_seq, | |
368 | IP_VS_CONN_F_OUT_SEQ, seq, diff); | |
369 | ||
370 | return 1; | |
371 | } | |
372 | ||
373 | /* | |
374 | * Output pkt hook. Will call bound ip_vs_app specific function | |
375 | * called by ipvs packet handler, assumes previously checked cp!=NULL | |
376 | * returns false if it can't handle packet (oom) | |
377 | */ | |
3db05fea | 378 | int ip_vs_app_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
379 | { |
380 | struct ip_vs_app *app; | |
381 | ||
382 | /* | |
383 | * check if application module is bound to | |
384 | * this ip_vs_conn. | |
385 | */ | |
386 | if ((app = cp->app) == NULL) | |
387 | return 1; | |
388 | ||
389 | /* TCP is complicated */ | |
390 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 391 | return app_tcp_pkt_out(cp, skb, app); |
1da177e4 LT |
392 | |
393 | /* | |
394 | * Call private output hook function | |
395 | */ | |
396 | if (app->pkt_out == NULL) | |
397 | return 1; | |
398 | ||
3db05fea | 399 | return app->pkt_out(app, cp, skb, NULL); |
1da177e4 LT |
400 | } |
401 | ||
402 | ||
3db05fea | 403 | static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb, |
1da177e4 LT |
404 | struct ip_vs_app *app) |
405 | { | |
406 | int diff; | |
3db05fea | 407 | const unsigned int tcp_offset = ip_hdrlen(skb); |
1da177e4 LT |
408 | struct tcphdr *th; |
409 | __u32 seq; | |
410 | ||
3db05fea | 411 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
1da177e4 LT |
412 | return 0; |
413 | ||
3db05fea | 414 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
1da177e4 LT |
415 | |
416 | /* | |
417 | * Remember seq number in case this pkt gets resized | |
418 | */ | |
419 | seq = ntohl(th->seq); | |
420 | ||
421 | /* | |
422 | * Fix seq stuff if flagged as so. | |
423 | */ | |
424 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) | |
425 | vs_fix_seq(&cp->in_seq, th); | |
426 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) | |
427 | vs_fix_ack_seq(&cp->out_seq, th); | |
428 | ||
429 | /* | |
430 | * Call private input hook function | |
431 | */ | |
432 | if (app->pkt_in == NULL) | |
433 | return 1; | |
434 | ||
3db05fea | 435 | if (!app->pkt_in(app, cp, skb, &diff)) |
1da177e4 LT |
436 | return 0; |
437 | ||
438 | /* | |
439 | * Update ip_vs seq stuff if len has changed. | |
440 | */ | |
441 | if (diff != 0) | |
442 | vs_seq_update(cp, &cp->in_seq, | |
443 | IP_VS_CONN_F_IN_SEQ, seq, diff); | |
444 | ||
445 | return 1; | |
446 | } | |
447 | ||
448 | /* | |
449 | * Input pkt hook. Will call bound ip_vs_app specific function | |
450 | * called by ipvs packet handler, assumes previously checked cp!=NULL. | |
451 | * returns false if can't handle packet (oom). | |
452 | */ | |
3db05fea | 453 | int ip_vs_app_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb) |
1da177e4 LT |
454 | { |
455 | struct ip_vs_app *app; | |
456 | ||
457 | /* | |
458 | * check if application module is bound to | |
459 | * this ip_vs_conn. | |
460 | */ | |
461 | if ((app = cp->app) == NULL) | |
462 | return 1; | |
463 | ||
464 | /* TCP is complicated */ | |
465 | if (cp->protocol == IPPROTO_TCP) | |
3db05fea | 466 | return app_tcp_pkt_in(cp, skb, app); |
1da177e4 LT |
467 | |
468 | /* | |
469 | * Call private input hook function | |
470 | */ | |
471 | if (app->pkt_in == NULL) | |
472 | return 1; | |
473 | ||
3db05fea | 474 | return app->pkt_in(app, cp, skb, NULL); |
1da177e4 LT |
475 | } |
476 | ||
477 | ||
478 | #ifdef CONFIG_PROC_FS | |
479 | /* | |
480 | * /proc/net/ip_vs_app entry function | |
481 | */ | |
482 | ||
483 | static struct ip_vs_app *ip_vs_app_idx(loff_t pos) | |
484 | { | |
485 | struct ip_vs_app *app, *inc; | |
486 | ||
487 | list_for_each_entry(app, &ip_vs_app_list, a_list) { | |
488 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
489 | if (pos-- == 0) | |
490 | return inc; | |
491 | } | |
492 | } | |
493 | return NULL; | |
494 | ||
495 | } | |
496 | ||
497 | static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos) | |
498 | { | |
57b47a53 | 499 | mutex_lock(&__ip_vs_app_mutex); |
1da177e4 LT |
500 | |
501 | return *pos ? ip_vs_app_idx(*pos - 1) : SEQ_START_TOKEN; | |
502 | } | |
503 | ||
504 | static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
505 | { | |
506 | struct ip_vs_app *inc, *app; | |
507 | struct list_head *e; | |
508 | ||
509 | ++*pos; | |
510 | if (v == SEQ_START_TOKEN) | |
511 | return ip_vs_app_idx(0); | |
512 | ||
513 | inc = v; | |
514 | app = inc->app; | |
515 | ||
516 | if ((e = inc->a_list.next) != &app->incs_list) | |
517 | return list_entry(e, struct ip_vs_app, a_list); | |
518 | ||
519 | /* go on to next application */ | |
520 | for (e = app->a_list.next; e != &ip_vs_app_list; e = e->next) { | |
521 | app = list_entry(e, struct ip_vs_app, a_list); | |
522 | list_for_each_entry(inc, &app->incs_list, a_list) { | |
523 | return inc; | |
524 | } | |
525 | } | |
526 | return NULL; | |
527 | } | |
528 | ||
529 | static void ip_vs_app_seq_stop(struct seq_file *seq, void *v) | |
530 | { | |
57b47a53 | 531 | mutex_unlock(&__ip_vs_app_mutex); |
1da177e4 LT |
532 | } |
533 | ||
534 | static int ip_vs_app_seq_show(struct seq_file *seq, void *v) | |
535 | { | |
536 | if (v == SEQ_START_TOKEN) | |
537 | seq_puts(seq, "prot port usecnt name\n"); | |
538 | else { | |
539 | const struct ip_vs_app *inc = v; | |
540 | ||
541 | seq_printf(seq, "%-3s %-7u %-6d %-17s\n", | |
542 | ip_vs_proto_name(inc->protocol), | |
543 | ntohs(inc->port), | |
544 | atomic_read(&inc->usecnt), | |
545 | inc->name); | |
546 | } | |
547 | return 0; | |
548 | } | |
549 | ||
56b3d975 | 550 | static const struct seq_operations ip_vs_app_seq_ops = { |
1da177e4 LT |
551 | .start = ip_vs_app_seq_start, |
552 | .next = ip_vs_app_seq_next, | |
553 | .stop = ip_vs_app_seq_stop, | |
554 | .show = ip_vs_app_seq_show, | |
555 | }; | |
556 | ||
557 | static int ip_vs_app_open(struct inode *inode, struct file *file) | |
558 | { | |
559 | return seq_open(file, &ip_vs_app_seq_ops); | |
560 | } | |
561 | ||
9a32144e | 562 | static const struct file_operations ip_vs_app_fops = { |
1da177e4 LT |
563 | .owner = THIS_MODULE, |
564 | .open = ip_vs_app_open, | |
565 | .read = seq_read, | |
566 | .llseek = seq_lseek, | |
567 | .release = seq_release, | |
568 | }; | |
569 | #endif | |
570 | ||
571 | ||
572 | /* | |
573 | * Replace a segment of data with a new segment | |
574 | */ | |
dd0fc66f | 575 | int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
1da177e4 LT |
576 | char *o_buf, int o_len, char *n_buf, int n_len) |
577 | { | |
1da177e4 LT |
578 | int diff; |
579 | int o_offset; | |
580 | int o_left; | |
581 | ||
582 | EnterFunction(9); | |
583 | ||
584 | diff = n_len - o_len; | |
585 | o_offset = o_buf - (char *)skb->data; | |
586 | /* The length of left data after o_buf+o_len in the skb data */ | |
587 | o_left = skb->len - (o_offset + o_len); | |
588 | ||
589 | if (diff <= 0) { | |
590 | memmove(o_buf + n_len, o_buf + o_len, o_left); | |
591 | memcpy(o_buf, n_buf, n_len); | |
592 | skb_trim(skb, skb->len + diff); | |
593 | } else if (diff <= skb_tailroom(skb)) { | |
594 | skb_put(skb, diff); | |
595 | memmove(o_buf + n_len, o_buf + o_len, o_left); | |
596 | memcpy(o_buf, n_buf, n_len); | |
597 | } else { | |
598 | if (pskb_expand_head(skb, skb_headroom(skb), diff, pri)) | |
599 | return -ENOMEM; | |
600 | skb_put(skb, diff); | |
601 | memmove(skb->data + o_offset + n_len, | |
602 | skb->data + o_offset + o_len, o_left); | |
27d7ff46 | 603 | skb_copy_to_linear_data_offset(skb, o_offset, n_buf, n_len); |
1da177e4 LT |
604 | } |
605 | ||
606 | /* must update the iph total length here */ | |
eddc9ec5 | 607 | ip_hdr(skb)->tot_len = htons(skb->len); |
1da177e4 LT |
608 | |
609 | LeaveFunction(9); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | ||
048cf48b | 614 | int __init ip_vs_app_init(void) |
1da177e4 LT |
615 | { |
616 | /* we will replace it with proc_net_ipvs_create() soon */ | |
457c4cbc | 617 | proc_net_fops_create(&init_net, "ip_vs_app", 0, &ip_vs_app_fops); |
1da177e4 LT |
618 | return 0; |
619 | } | |
620 | ||
621 | ||
622 | void ip_vs_app_cleanup(void) | |
623 | { | |
457c4cbc | 624 | proc_net_remove(&init_net, "ip_vs_app"); |
1da177e4 | 625 | } |