Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* FTP extension for IP connection tracking. */ |
2 | ||
3 | /* (C) 1999-2001 Paul `Rusty' Russell | |
4 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/netfilter.h> | |
13 | #include <linux/ip.h> | |
14 | #include <linux/ctype.h> | |
15 | #include <net/checksum.h> | |
16 | #include <net/tcp.h> | |
17 | ||
1da177e4 LT |
18 | #include <linux/netfilter_ipv4/ip_conntrack_helper.h> |
19 | #include <linux/netfilter_ipv4/ip_conntrack_ftp.h> | |
20 | #include <linux/moduleparam.h> | |
21 | ||
22 | MODULE_LICENSE("GPL"); | |
23 | MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>"); | |
24 | MODULE_DESCRIPTION("ftp connection tracking helper"); | |
25 | ||
26 | /* This is slow, but it's simple. --RR */ | |
2669d63d | 27 | static char *ftp_buffer; |
e45b1be8 | 28 | static DEFINE_SPINLOCK(ip_ftp_lock); |
1da177e4 LT |
29 | |
30 | #define MAX_PORTS 8 | |
2fce76af | 31 | static unsigned short ports[MAX_PORTS]; |
1da177e4 | 32 | static int ports_c; |
2fce76af | 33 | module_param_array(ports, ushort, &ports_c, 0400); |
1da177e4 LT |
34 | |
35 | static int loose; | |
e7be6994 | 36 | module_param(loose, bool, 0600); |
1da177e4 LT |
37 | |
38 | unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb, | |
39 | enum ip_conntrack_info ctinfo, | |
40 | enum ip_ct_ftp_type type, | |
41 | unsigned int matchoff, | |
42 | unsigned int matchlen, | |
43 | struct ip_conntrack_expect *exp, | |
44 | u32 *seq); | |
45 | EXPORT_SYMBOL_GPL(ip_nat_ftp_hook); | |
46 | ||
47 | #if 0 | |
48 | #define DEBUGP printk | |
49 | #else | |
50 | #define DEBUGP(format, args...) | |
51 | #endif | |
52 | ||
53 | static int try_rfc959(const char *, size_t, u_int32_t [], char); | |
54 | static int try_eprt(const char *, size_t, u_int32_t [], char); | |
55 | static int try_epsv_response(const char *, size_t, u_int32_t [], char); | |
56 | ||
9b5b5cff | 57 | static const struct ftp_search { |
1da177e4 LT |
58 | const char *pattern; |
59 | size_t plen; | |
60 | char skip; | |
61 | char term; | |
62 | enum ip_ct_ftp_type ftptype; | |
63 | int (*getnum)(const char *, size_t, u_int32_t[], char); | |
7d8c5018 PM |
64 | } search[IP_CT_DIR_MAX][2] = { |
65 | [IP_CT_DIR_ORIGINAL] = { | |
66 | { | |
67 | .pattern = "PORT", | |
68 | .plen = sizeof("PORT") - 1, | |
69 | .skip = ' ', | |
70 | .term = '\r', | |
71 | .ftptype = IP_CT_FTP_PORT, | |
72 | .getnum = try_rfc959, | |
73 | }, | |
74 | { | |
75 | .pattern = "EPRT", | |
76 | .plen = sizeof("EPRT") - 1, | |
77 | .skip = ' ', | |
78 | .term = '\r', | |
79 | .ftptype = IP_CT_FTP_EPRT, | |
80 | .getnum = try_eprt, | |
81 | }, | |
1da177e4 | 82 | }, |
7d8c5018 PM |
83 | [IP_CT_DIR_REPLY] = { |
84 | { | |
85 | .pattern = "227 ", | |
86 | .plen = sizeof("227 ") - 1, | |
87 | .skip = '(', | |
88 | .term = ')', | |
89 | .ftptype = IP_CT_FTP_PASV, | |
90 | .getnum = try_rfc959, | |
91 | }, | |
92 | { | |
93 | .pattern = "229 ", | |
94 | .plen = sizeof("229 ") - 1, | |
95 | .skip = '(', | |
96 | .term = ')', | |
97 | .ftptype = IP_CT_FTP_EPSV, | |
98 | .getnum = try_epsv_response, | |
99 | }, | |
1da177e4 LT |
100 | }, |
101 | }; | |
102 | ||
103 | static int try_number(const char *data, size_t dlen, u_int32_t array[], | |
104 | int array_size, char sep, char term) | |
105 | { | |
106 | u_int32_t i, len; | |
107 | ||
108 | memset(array, 0, sizeof(array[0])*array_size); | |
109 | ||
110 | /* Keep data pointing at next char. */ | |
111 | for (i = 0, len = 0; len < dlen && i < array_size; len++, data++) { | |
112 | if (*data >= '0' && *data <= '9') { | |
113 | array[i] = array[i]*10 + *data - '0'; | |
114 | } | |
115 | else if (*data == sep) | |
116 | i++; | |
117 | else { | |
118 | /* Unexpected character; true if it's the | |
119 | terminator and we're finished. */ | |
120 | if (*data == term && i == array_size - 1) | |
121 | return len; | |
122 | ||
123 | DEBUGP("Char %u (got %u nums) `%u' unexpected\n", | |
124 | len, i, *data); | |
125 | return 0; | |
126 | } | |
127 | } | |
128 | DEBUGP("Failed to fill %u numbers separated by %c\n", array_size, sep); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | /* Returns 0, or length of numbers: 192,168,1,1,5,6 */ | |
134 | static int try_rfc959(const char *data, size_t dlen, u_int32_t array[6], | |
135 | char term) | |
136 | { | |
137 | return try_number(data, dlen, array, 6, ',', term); | |
138 | } | |
139 | ||
140 | /* Grab port: number up to delimiter */ | |
141 | static int get_port(const char *data, int start, size_t dlen, char delim, | |
142 | u_int32_t array[2]) | |
143 | { | |
144 | u_int16_t port = 0; | |
145 | int i; | |
146 | ||
147 | for (i = start; i < dlen; i++) { | |
148 | /* Finished? */ | |
149 | if (data[i] == delim) { | |
150 | if (port == 0) | |
151 | break; | |
152 | array[0] = port >> 8; | |
153 | array[1] = port; | |
154 | return i + 1; | |
155 | } | |
156 | else if (data[i] >= '0' && data[i] <= '9') | |
157 | port = port*10 + data[i] - '0'; | |
158 | else /* Some other crap */ | |
159 | break; | |
160 | } | |
161 | return 0; | |
162 | } | |
163 | ||
164 | /* Returns 0, or length of numbers: |1|132.235.1.2|6275| */ | |
165 | static int try_eprt(const char *data, size_t dlen, u_int32_t array[6], | |
166 | char term) | |
167 | { | |
168 | char delim; | |
169 | int length; | |
170 | ||
171 | /* First character is delimiter, then "1" for IPv4, then | |
172 | delimiter again. */ | |
173 | if (dlen <= 3) return 0; | |
174 | delim = data[0]; | |
175 | if (isdigit(delim) || delim < 33 || delim > 126 | |
176 | || data[1] != '1' || data[2] != delim) | |
177 | return 0; | |
178 | ||
179 | DEBUGP("EPRT: Got |1|!\n"); | |
180 | /* Now we have IP address. */ | |
181 | length = try_number(data + 3, dlen - 3, array, 4, '.', delim); | |
182 | if (length == 0) | |
183 | return 0; | |
184 | ||
185 | DEBUGP("EPRT: Got IP address!\n"); | |
186 | /* Start offset includes initial "|1|", and trailing delimiter */ | |
187 | return get_port(data, 3 + length + 1, dlen, delim, array+4); | |
188 | } | |
189 | ||
190 | /* Returns 0, or length of numbers: |||6446| */ | |
191 | static int try_epsv_response(const char *data, size_t dlen, u_int32_t array[6], | |
192 | char term) | |
193 | { | |
194 | char delim; | |
195 | ||
196 | /* Three delimiters. */ | |
197 | if (dlen <= 3) return 0; | |
198 | delim = data[0]; | |
199 | if (isdigit(delim) || delim < 33 || delim > 126 | |
200 | || data[1] != delim || data[2] != delim) | |
201 | return 0; | |
202 | ||
203 | return get_port(data, 3, dlen, delim, array+4); | |
204 | } | |
205 | ||
206 | /* Return 1 for match, 0 for accept, -1 for partial. */ | |
207 | static int find_pattern(const char *data, size_t dlen, | |
208 | const char *pattern, size_t plen, | |
209 | char skip, char term, | |
210 | unsigned int *numoff, | |
211 | unsigned int *numlen, | |
212 | u_int32_t array[6], | |
213 | int (*getnum)(const char *, size_t, u_int32_t[], char)) | |
214 | { | |
215 | size_t i; | |
216 | ||
217 | DEBUGP("find_pattern `%s': dlen = %u\n", pattern, dlen); | |
218 | if (dlen == 0) | |
219 | return 0; | |
220 | ||
221 | if (dlen <= plen) { | |
222 | /* Short packet: try for partial? */ | |
223 | if (strnicmp(data, pattern, dlen) == 0) | |
224 | return -1; | |
225 | else return 0; | |
226 | } | |
227 | ||
228 | if (strnicmp(data, pattern, plen) != 0) { | |
229 | #if 0 | |
230 | size_t i; | |
231 | ||
232 | DEBUGP("ftp: string mismatch\n"); | |
233 | for (i = 0; i < plen; i++) { | |
234 | DEBUGP("ftp:char %u `%c'(%u) vs `%c'(%u)\n", | |
235 | i, data[i], data[i], | |
236 | pattern[i], pattern[i]); | |
237 | } | |
238 | #endif | |
239 | return 0; | |
240 | } | |
241 | ||
242 | DEBUGP("Pattern matches!\n"); | |
243 | /* Now we've found the constant string, try to skip | |
244 | to the 'skip' character */ | |
245 | for (i = plen; data[i] != skip; i++) | |
246 | if (i == dlen - 1) return -1; | |
247 | ||
248 | /* Skip over the last character */ | |
249 | i++; | |
250 | ||
251 | DEBUGP("Skipped up to `%c'!\n", skip); | |
252 | ||
253 | *numoff = i; | |
254 | *numlen = getnum(data + i, dlen - i, array, term); | |
255 | if (!*numlen) | |
256 | return -1; | |
257 | ||
258 | DEBUGP("Match succeeded!\n"); | |
259 | return 1; | |
260 | } | |
261 | ||
262 | /* Look up to see if we're just after a \n. */ | |
f649a3bf | 263 | static int find_nl_seq(u32 seq, const struct ip_ct_ftp_master *info, int dir) |
1da177e4 LT |
264 | { |
265 | unsigned int i; | |
266 | ||
267 | for (i = 0; i < info->seq_aft_nl_num[dir]; i++) | |
268 | if (info->seq_aft_nl[dir][i] == seq) | |
269 | return 1; | |
270 | return 0; | |
271 | } | |
272 | ||
273 | /* We don't update if it's older than what we have. */ | |
ac3247ba HW |
274 | static void update_nl_seq(u32 nl_seq, struct ip_ct_ftp_master *info, int dir, |
275 | struct sk_buff *skb) | |
1da177e4 LT |
276 | { |
277 | unsigned int i, oldest = NUM_SEQ_TO_REMEMBER; | |
278 | ||
279 | /* Look for oldest: if we find exact match, we're done. */ | |
280 | for (i = 0; i < info->seq_aft_nl_num[dir]; i++) { | |
281 | if (info->seq_aft_nl[dir][i] == nl_seq) | |
282 | return; | |
283 | ||
284 | if (oldest == info->seq_aft_nl_num[dir] | |
285 | || before(info->seq_aft_nl[dir][i], oldest)) | |
286 | oldest = i; | |
287 | } | |
288 | ||
ac3247ba | 289 | if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) { |
1da177e4 | 290 | info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq; |
ac3247ba HW |
291 | ip_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb); |
292 | } else if (oldest != NUM_SEQ_TO_REMEMBER) { | |
1da177e4 | 293 | info->seq_aft_nl[dir][oldest] = nl_seq; |
ac3247ba HW |
294 | ip_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb); |
295 | } | |
1da177e4 LT |
296 | } |
297 | ||
298 | static int help(struct sk_buff **pskb, | |
299 | struct ip_conntrack *ct, | |
300 | enum ip_conntrack_info ctinfo) | |
301 | { | |
302 | unsigned int dataoff, datalen; | |
303 | struct tcphdr _tcph, *th; | |
304 | char *fb_ptr; | |
305 | int ret; | |
306 | u32 seq, array[6] = { 0 }; | |
307 | int dir = CTINFO2DIR(ctinfo); | |
308 | unsigned int matchlen, matchoff; | |
309 | struct ip_ct_ftp_master *ct_ftp_info = &ct->help.ct_ftp_info; | |
310 | struct ip_conntrack_expect *exp; | |
311 | unsigned int i; | |
312 | int found = 0, ends_in_nl; | |
337fbc41 | 313 | typeof(ip_nat_ftp_hook) ip_nat_ftp; |
1da177e4 LT |
314 | |
315 | /* Until there's been traffic both ways, don't look in packets. */ | |
316 | if (ctinfo != IP_CT_ESTABLISHED | |
317 | && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) { | |
318 | DEBUGP("ftp: Conntrackinfo = %u\n", ctinfo); | |
319 | return NF_ACCEPT; | |
320 | } | |
321 | ||
322 | th = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl*4, | |
323 | sizeof(_tcph), &_tcph); | |
324 | if (th == NULL) | |
325 | return NF_ACCEPT; | |
326 | ||
327 | dataoff = (*pskb)->nh.iph->ihl*4 + th->doff*4; | |
328 | /* No data? */ | |
329 | if (dataoff >= (*pskb)->len) { | |
330 | DEBUGP("ftp: pskblen = %u\n", (*pskb)->len); | |
331 | return NF_ACCEPT; | |
332 | } | |
333 | datalen = (*pskb)->len - dataoff; | |
334 | ||
e45b1be8 | 335 | spin_lock_bh(&ip_ftp_lock); |
1da177e4 LT |
336 | fb_ptr = skb_header_pointer(*pskb, dataoff, |
337 | (*pskb)->len - dataoff, ftp_buffer); | |
338 | BUG_ON(fb_ptr == NULL); | |
339 | ||
340 | ends_in_nl = (fb_ptr[datalen - 1] == '\n'); | |
341 | seq = ntohl(th->seq) + datalen; | |
342 | ||
343 | /* Look up to see if we're just after a \n. */ | |
344 | if (!find_nl_seq(ntohl(th->seq), ct_ftp_info, dir)) { | |
345 | /* Now if this ends in \n, update ftp info. */ | |
346 | DEBUGP("ip_conntrack_ftp_help: wrong seq pos %s(%u) or %s(%u)\n", | |
347 | ct_ftp_info->seq_aft_nl[0][dir] | |
348 | old_seq_aft_nl_set ? "":"(UNSET) ", old_seq_aft_nl); | |
349 | ret = NF_ACCEPT; | |
350 | goto out_update_nl; | |
351 | } | |
352 | ||
353 | /* Initialize IP array to expected address (it's not mentioned | |
354 | in EPSV responses) */ | |
355 | array[0] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 24) & 0xFF; | |
356 | array[1] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 16) & 0xFF; | |
357 | array[2] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 8) & 0xFF; | |
358 | array[3] = ntohl(ct->tuplehash[dir].tuple.src.ip) & 0xFF; | |
359 | ||
7d8c5018 | 360 | for (i = 0; i < ARRAY_SIZE(search[dir]); i++) { |
1da177e4 | 361 | found = find_pattern(fb_ptr, (*pskb)->len - dataoff, |
7d8c5018 PM |
362 | search[dir][i].pattern, |
363 | search[dir][i].plen, | |
364 | search[dir][i].skip, | |
365 | search[dir][i].term, | |
1da177e4 LT |
366 | &matchoff, &matchlen, |
367 | array, | |
7d8c5018 | 368 | search[dir][i].getnum); |
1da177e4 LT |
369 | if (found) break; |
370 | } | |
371 | if (found == -1) { | |
372 | /* We don't usually drop packets. After all, this is | |
373 | connection tracking, not packet filtering. | |
374 | However, it is necessary for accurate tracking in | |
375 | this case. */ | |
376 | if (net_ratelimit()) | |
377 | printk("conntrack_ftp: partial %s %u+%u\n", | |
7d8c5018 | 378 | search[dir][i].pattern, |
1da177e4 LT |
379 | ntohl(th->seq), datalen); |
380 | ret = NF_DROP; | |
381 | goto out; | |
382 | } else if (found == 0) { /* No match */ | |
383 | ret = NF_ACCEPT; | |
384 | goto out_update_nl; | |
385 | } | |
386 | ||
387 | DEBUGP("conntrack_ftp: match `%s' (%u bytes at %u)\n", | |
388 | fb_ptr + matchoff, matchlen, ntohl(th->seq) + matchoff); | |
389 | ||
390 | /* Allocate expectation which will be inserted */ | |
4acdbdbe | 391 | exp = ip_conntrack_expect_alloc(ct); |
1da177e4 LT |
392 | if (exp == NULL) { |
393 | ret = NF_DROP; | |
394 | goto out; | |
395 | } | |
396 | ||
397 | /* We refer to the reverse direction ("!dir") tuples here, | |
398 | * because we're expecting something in the other direction. | |
399 | * Doesn't matter unless NAT is happening. */ | |
400 | exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip; | |
401 | ||
402 | if (htonl((array[0] << 24) | (array[1] << 16) | (array[2] << 8) | array[3]) | |
403 | != ct->tuplehash[dir].tuple.src.ip) { | |
404 | /* Enrico Scholz's passive FTP to partially RNAT'd ftp | |
405 | server: it really wants us to connect to a | |
406 | different IP address. Simply don't record it for | |
407 | NAT. */ | |
408 | DEBUGP("conntrack_ftp: NOT RECORDING: %u,%u,%u,%u != %u.%u.%u.%u\n", | |
409 | array[0], array[1], array[2], array[3], | |
410 | NIPQUAD(ct->tuplehash[dir].tuple.src.ip)); | |
411 | ||
412 | /* Thanks to Cristiano Lincoln Mattos | |
413 | <lincoln@cesar.org.br> for reporting this potential | |
414 | problem (DMZ machines opening holes to internal | |
415 | networks, or the packet filter itself). */ | |
416 | if (!loose) { | |
417 | ret = NF_ACCEPT; | |
4acdbdbe | 418 | goto out_put_expect; |
1da177e4 LT |
419 | } |
420 | exp->tuple.dst.ip = htonl((array[0] << 24) | (array[1] << 16) | |
421 | | (array[2] << 8) | array[3]); | |
422 | } | |
423 | ||
424 | exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip; | |
425 | exp->tuple.dst.u.tcp.port = htons(array[4] << 8 | array[5]); | |
426 | exp->tuple.src.u.tcp.port = 0; /* Don't care. */ | |
427 | exp->tuple.dst.protonum = IPPROTO_TCP; | |
428 | exp->mask = ((struct ip_conntrack_tuple) | |
cdcb71bf AV |
429 | { { htonl(0xFFFFFFFF), { 0 } }, |
430 | { htonl(0xFFFFFFFF), { .tcp = { htons(0xFFFF) } }, 0xFF }}); | |
1da177e4 LT |
431 | |
432 | exp->expectfn = NULL; | |
2248bcfc | 433 | exp->flags = 0; |
1da177e4 LT |
434 | |
435 | /* Now, NAT might want to mangle the packet, and register the | |
436 | * (possibly changed) expectation itself. */ | |
337fbc41 PM |
437 | ip_nat_ftp = rcu_dereference(ip_nat_ftp_hook); |
438 | if (ip_nat_ftp) | |
439 | ret = ip_nat_ftp(pskb, ctinfo, search[dir][i].ftptype, | |
440 | matchoff, matchlen, exp, &seq); | |
1da177e4 LT |
441 | else { |
442 | /* Can't expect this? Best to drop packet now. */ | |
4acdbdbe | 443 | if (ip_conntrack_expect_related(exp) != 0) |
1da177e4 | 444 | ret = NF_DROP; |
4acdbdbe | 445 | else |
1da177e4 LT |
446 | ret = NF_ACCEPT; |
447 | } | |
448 | ||
4acdbdbe RR |
449 | out_put_expect: |
450 | ip_conntrack_expect_put(exp); | |
451 | ||
1da177e4 LT |
452 | out_update_nl: |
453 | /* Now if this ends in \n, update ftp info. Seq may have been | |
454 | * adjusted by NAT code. */ | |
455 | if (ends_in_nl) | |
ac3247ba | 456 | update_nl_seq(seq, ct_ftp_info,dir, *pskb); |
1da177e4 | 457 | out: |
e45b1be8 | 458 | spin_unlock_bh(&ip_ftp_lock); |
1da177e4 LT |
459 | return ret; |
460 | } | |
461 | ||
462 | static struct ip_conntrack_helper ftp[MAX_PORTS]; | |
5cb30640 | 463 | static char ftp_names[MAX_PORTS][sizeof("ftp-65535")]; |
1da177e4 LT |
464 | |
465 | /* Not __exit: called from init() */ | |
65b4b4e8 | 466 | static void ip_conntrack_ftp_fini(void) |
1da177e4 LT |
467 | { |
468 | int i; | |
469 | for (i = 0; i < ports_c; i++) { | |
470 | DEBUGP("ip_ct_ftp: unregistering helper for port %d\n", | |
471 | ports[i]); | |
472 | ip_conntrack_helper_unregister(&ftp[i]); | |
473 | } | |
2669d63d HW |
474 | |
475 | kfree(ftp_buffer); | |
1da177e4 LT |
476 | } |
477 | ||
65b4b4e8 | 478 | static int __init ip_conntrack_ftp_init(void) |
1da177e4 LT |
479 | { |
480 | int i, ret; | |
481 | char *tmpname; | |
482 | ||
2669d63d HW |
483 | ftp_buffer = kmalloc(65536, GFP_KERNEL); |
484 | if (!ftp_buffer) | |
485 | return -ENOMEM; | |
486 | ||
1da177e4 LT |
487 | if (ports_c == 0) |
488 | ports[ports_c++] = FTP_PORT; | |
489 | ||
490 | for (i = 0; i < ports_c; i++) { | |
491 | ftp[i].tuple.src.u.tcp.port = htons(ports[i]); | |
492 | ftp[i].tuple.dst.protonum = IPPROTO_TCP; | |
cdcb71bf | 493 | ftp[i].mask.src.u.tcp.port = htons(0xFFFF); |
1da177e4 LT |
494 | ftp[i].mask.dst.protonum = 0xFF; |
495 | ftp[i].max_expected = 1; | |
496 | ftp[i].timeout = 5 * 60; /* 5 minutes */ | |
497 | ftp[i].me = THIS_MODULE; | |
498 | ftp[i].help = help; | |
499 | ||
500 | tmpname = &ftp_names[i][0]; | |
501 | if (ports[i] == FTP_PORT) | |
502 | sprintf(tmpname, "ftp"); | |
503 | else | |
504 | sprintf(tmpname, "ftp-%d", ports[i]); | |
505 | ftp[i].name = tmpname; | |
506 | ||
507 | DEBUGP("ip_ct_ftp: registering helper for port %d\n", | |
508 | ports[i]); | |
509 | ret = ip_conntrack_helper_register(&ftp[i]); | |
510 | ||
511 | if (ret) { | |
65b4b4e8 | 512 | ip_conntrack_ftp_fini(); |
1da177e4 LT |
513 | return ret; |
514 | } | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | ||
65b4b4e8 AM |
519 | module_init(ip_conntrack_ftp_init); |
520 | module_exit(ip_conntrack_ftp_fini); |