Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* FTP extension for connection tracking. */ |
| 2 | |
| 3 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 4 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 5 | * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 6 | * (C) 2006-2012 Patrick McHardy <kaber@trash.net> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 11 | */ |
| 12 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/netfilter.h> |
| 16 | #include <linux/ip.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 18 | #include <linux/ipv6.h> |
| 19 | #include <linux/ctype.h> |
David S. Miller | 6a28ec8 | 2006-08-26 19:48:49 -0700 | [diff] [blame] | 20 | #include <linux/inet.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 21 | #include <net/checksum.h> |
| 22 | #include <net/tcp.h> |
| 23 | |
| 24 | #include <net/netfilter/nf_conntrack.h> |
Martin Josefsson | 77ab9cf | 2006-11-29 02:34:58 +0100 | [diff] [blame] | 25 | #include <net/netfilter/nf_conntrack_expect.h> |
Martin Josefsson | f618012 | 2006-11-29 02:35:01 +0100 | [diff] [blame] | 26 | #include <net/netfilter/nf_conntrack_ecache.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 27 | #include <net/netfilter/nf_conntrack_helper.h> |
| 28 | #include <linux/netfilter/nf_conntrack_ftp.h> |
| 29 | |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>"); |
| 32 | MODULE_DESCRIPTION("ftp connection tracking helper"); |
Patrick McHardy | d2483dd | 2006-12-02 22:06:05 -0800 | [diff] [blame] | 33 | MODULE_ALIAS("ip_conntrack_ftp"); |
Pablo Neira Ayuso | 4dc06f9 | 2008-11-17 16:01:42 +0100 | [diff] [blame] | 34 | MODULE_ALIAS_NFCT_HELPER("ftp"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 35 | |
| 36 | /* This is slow, but it's simple. --RR */ |
| 37 | static char *ftp_buffer; |
| 38 | |
| 39 | static DEFINE_SPINLOCK(nf_ftp_lock); |
| 40 | |
| 41 | #define MAX_PORTS 8 |
| 42 | static u_int16_t ports[MAX_PORTS]; |
| 43 | static unsigned int ports_c; |
| 44 | module_param_array(ports, ushort, &ports_c, 0400); |
| 45 | |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 46 | static bool loose; |
Patrick McHardy | e7be699 | 2006-01-05 12:19:46 -0800 | [diff] [blame] | 47 | module_param(loose, bool, 0600); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 48 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 49 | unsigned int (*nf_nat_ftp_hook)(struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 50 | enum ip_conntrack_info ctinfo, |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 51 | enum nf_ct_ftp_type type, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 52 | unsigned int protoff, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 53 | unsigned int matchoff, |
| 54 | unsigned int matchlen, |
Patrick McHardy | 25b86e0 | 2007-05-24 16:41:50 -0700 | [diff] [blame] | 55 | struct nf_conntrack_expect *exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 56 | EXPORT_SYMBOL_GPL(nf_nat_ftp_hook); |
| 57 | |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 58 | static int try_rfc959(const char *, size_t, struct nf_conntrack_man *, |
| 59 | char, unsigned int *); |
| 60 | static int try_rfc1123(const char *, size_t, struct nf_conntrack_man *, |
| 61 | char, unsigned int *); |
| 62 | static int try_eprt(const char *, size_t, struct nf_conntrack_man *, |
| 63 | char, unsigned int *); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 64 | static int try_epsv_response(const char *, size_t, struct nf_conntrack_man *, |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 65 | char, unsigned int *); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 66 | |
| 67 | static struct ftp_search { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 68 | const char *pattern; |
| 69 | size_t plen; |
| 70 | char skip; |
| 71 | char term; |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 72 | enum nf_ct_ftp_type ftptype; |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 73 | int (*getnum)(const char *, size_t, struct nf_conntrack_man *, char, unsigned int *); |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 74 | } search[IP_CT_DIR_MAX][2] = { |
| 75 | [IP_CT_DIR_ORIGINAL] = { |
| 76 | { |
| 77 | .pattern = "PORT", |
| 78 | .plen = sizeof("PORT") - 1, |
| 79 | .skip = ' ', |
| 80 | .term = '\r', |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 81 | .ftptype = NF_CT_FTP_PORT, |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 82 | .getnum = try_rfc959, |
| 83 | }, |
| 84 | { |
| 85 | .pattern = "EPRT", |
| 86 | .plen = sizeof("EPRT") - 1, |
| 87 | .skip = ' ', |
| 88 | .term = '\r', |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 89 | .ftptype = NF_CT_FTP_EPRT, |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 90 | .getnum = try_eprt, |
| 91 | }, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 92 | }, |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 93 | [IP_CT_DIR_REPLY] = { |
| 94 | { |
| 95 | .pattern = "227 ", |
| 96 | .plen = sizeof("227 ") - 1, |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 97 | .ftptype = NF_CT_FTP_PASV, |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 98 | .getnum = try_rfc1123, |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 99 | }, |
| 100 | { |
| 101 | .pattern = "229 ", |
| 102 | .plen = sizeof("229 ") - 1, |
| 103 | .skip = '(', |
| 104 | .term = ')', |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 105 | .ftptype = NF_CT_FTP_EPSV, |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 106 | .getnum = try_epsv_response, |
| 107 | }, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 108 | }, |
| 109 | }; |
| 110 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 111 | static int |
| 112 | get_ipv6_addr(const char *src, size_t dlen, struct in6_addr *dst, u_int8_t term) |
| 113 | { |
David S. Miller | 6a28ec8 | 2006-08-26 19:48:49 -0700 | [diff] [blame] | 114 | const char *end; |
| 115 | int ret = in6_pton(src, min_t(size_t, dlen, 0xffff), (u8 *)dst, term, &end); |
YOSHIFUJI Hideaki | 1884f78 | 2006-06-19 03:20:32 +0900 | [diff] [blame] | 116 | if (ret > 0) |
| 117 | return (int)(end - src); |
| 118 | return 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static int try_number(const char *data, size_t dlen, u_int32_t array[], |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 122 | int array_size, char sep, char term) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 123 | { |
| 124 | u_int32_t i, len; |
| 125 | |
| 126 | memset(array, 0, sizeof(array[0])*array_size); |
| 127 | |
| 128 | /* Keep data pointing at next char. */ |
| 129 | for (i = 0, len = 0; len < dlen && i < array_size; len++, data++) { |
| 130 | if (*data >= '0' && *data <= '9') { |
| 131 | array[i] = array[i]*10 + *data - '0'; |
| 132 | } |
| 133 | else if (*data == sep) |
| 134 | i++; |
| 135 | else { |
| 136 | /* Unexpected character; true if it's the |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 137 | terminator (or we don't care about one) |
| 138 | and we're finished. */ |
| 139 | if ((*data == term || !term) && i == array_size - 1) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 140 | return len; |
| 141 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 142 | pr_debug("Char %u (got %u nums) `%u' unexpected\n", |
| 143 | len, i, *data); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 144 | return 0; |
| 145 | } |
| 146 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 147 | pr_debug("Failed to fill %u numbers separated by %c\n", |
| 148 | array_size, sep); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | /* Returns 0, or length of numbers: 192,168,1,1,5,6 */ |
| 153 | static int try_rfc959(const char *data, size_t dlen, |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 154 | struct nf_conntrack_man *cmd, char term, |
| 155 | unsigned int *offset) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 156 | { |
| 157 | int length; |
| 158 | u_int32_t array[6]; |
| 159 | |
| 160 | length = try_number(data, dlen, array, 6, ',', term); |
| 161 | if (length == 0) |
| 162 | return 0; |
| 163 | |
| 164 | cmd->u3.ip = htonl((array[0] << 24) | (array[1] << 16) | |
| 165 | (array[2] << 8) | array[3]); |
| 166 | cmd->u.tcp.port = htons((array[4] << 8) | array[5]); |
| 167 | return length; |
| 168 | } |
| 169 | |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 170 | /* |
| 171 | * From RFC 1123: |
| 172 | * The format of the 227 reply to a PASV command is not |
| 173 | * well standardized. In particular, an FTP client cannot |
| 174 | * assume that the parentheses shown on page 40 of RFC-959 |
| 175 | * will be present (and in fact, Figure 3 on page 43 omits |
| 176 | * them). Therefore, a User-FTP program that interprets |
| 177 | * the PASV reply must scan the reply for the first digit |
| 178 | * of the host and port numbers. |
| 179 | */ |
| 180 | static int try_rfc1123(const char *data, size_t dlen, |
| 181 | struct nf_conntrack_man *cmd, char term, |
| 182 | unsigned int *offset) |
| 183 | { |
| 184 | int i; |
| 185 | for (i = 0; i < dlen; i++) |
| 186 | if (isdigit(data[i])) |
| 187 | break; |
| 188 | |
| 189 | if (i == dlen) |
| 190 | return 0; |
| 191 | |
| 192 | *offset += i; |
| 193 | |
| 194 | return try_rfc959(data + i, dlen - i, cmd, 0, offset); |
| 195 | } |
| 196 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 197 | /* Grab port: number up to delimiter */ |
| 198 | static int get_port(const char *data, int start, size_t dlen, char delim, |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 199 | __be16 *port) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 200 | { |
| 201 | u_int16_t tmp_port = 0; |
| 202 | int i; |
| 203 | |
| 204 | for (i = start; i < dlen; i++) { |
| 205 | /* Finished? */ |
| 206 | if (data[i] == delim) { |
| 207 | if (tmp_port == 0) |
| 208 | break; |
| 209 | *port = htons(tmp_port); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 210 | pr_debug("get_port: return %d\n", tmp_port); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 211 | return i + 1; |
| 212 | } |
| 213 | else if (data[i] >= '0' && data[i] <= '9') |
| 214 | tmp_port = tmp_port*10 + data[i] - '0'; |
| 215 | else { /* Some other crap */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 216 | pr_debug("get_port: invalid char.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 217 | break; |
| 218 | } |
| 219 | } |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | /* Returns 0, or length of numbers: |1|132.235.1.2|6275| or |2|3ffe::1|6275| */ |
| 224 | static int try_eprt(const char *data, size_t dlen, struct nf_conntrack_man *cmd, |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 225 | char term, unsigned int *offset) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 226 | { |
| 227 | char delim; |
| 228 | int length; |
| 229 | |
| 230 | /* First character is delimiter, then "1" for IPv4 or "2" for IPv6, |
| 231 | then delimiter again. */ |
| 232 | if (dlen <= 3) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 233 | pr_debug("EPRT: too short\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 234 | return 0; |
| 235 | } |
| 236 | delim = data[0]; |
| 237 | if (isdigit(delim) || delim < 33 || delim > 126 || data[2] != delim) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 238 | pr_debug("try_eprt: invalid delimitter.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | if ((cmd->l3num == PF_INET && data[1] != '1') || |
| 243 | (cmd->l3num == PF_INET6 && data[1] != '2')) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 244 | pr_debug("EPRT: invalid protocol number.\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 248 | pr_debug("EPRT: Got %c%c%c\n", delim, data[1], delim); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 249 | |
| 250 | if (data[1] == '1') { |
| 251 | u_int32_t array[4]; |
| 252 | |
| 253 | /* Now we have IP address. */ |
| 254 | length = try_number(data + 3, dlen - 3, array, 4, '.', delim); |
| 255 | if (length != 0) |
| 256 | cmd->u3.ip = htonl((array[0] << 24) | (array[1] << 16) |
| 257 | | (array[2] << 8) | array[3]); |
| 258 | } else { |
| 259 | /* Now we have IPv6 address. */ |
| 260 | length = get_ipv6_addr(data + 3, dlen - 3, |
| 261 | (struct in6_addr *)cmd->u3.ip6, delim); |
| 262 | } |
| 263 | |
| 264 | if (length == 0) |
| 265 | return 0; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 266 | pr_debug("EPRT: Got IP address!\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 267 | /* Start offset includes initial "|1|", and trailing delimiter */ |
| 268 | return get_port(data, 3 + length + 1, dlen, delim, &cmd->u.tcp.port); |
| 269 | } |
| 270 | |
| 271 | /* Returns 0, or length of numbers: |||6446| */ |
| 272 | static int try_epsv_response(const char *data, size_t dlen, |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 273 | struct nf_conntrack_man *cmd, char term, |
| 274 | unsigned int *offset) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 275 | { |
| 276 | char delim; |
| 277 | |
| 278 | /* Three delimiters. */ |
| 279 | if (dlen <= 3) return 0; |
| 280 | delim = data[0]; |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 281 | if (isdigit(delim) || delim < 33 || delim > 126 || |
| 282 | data[1] != delim || data[2] != delim) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 283 | return 0; |
| 284 | |
| 285 | return get_port(data, 3, dlen, delim, &cmd->u.tcp.port); |
| 286 | } |
| 287 | |
| 288 | /* Return 1 for match, 0 for accept, -1 for partial. */ |
| 289 | static int find_pattern(const char *data, size_t dlen, |
| 290 | const char *pattern, size_t plen, |
| 291 | char skip, char term, |
| 292 | unsigned int *numoff, |
| 293 | unsigned int *numlen, |
| 294 | struct nf_conntrack_man *cmd, |
| 295 | int (*getnum)(const char *, size_t, |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 296 | struct nf_conntrack_man *, char, |
| 297 | unsigned int *)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 298 | { |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 299 | size_t i = plen; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 300 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 301 | pr_debug("find_pattern `%s': dlen = %Zu\n", pattern, dlen); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 302 | if (dlen == 0) |
| 303 | return 0; |
| 304 | |
| 305 | if (dlen <= plen) { |
| 306 | /* Short packet: try for partial? */ |
Rasmus Villemoes | 1808274 | 2014-10-13 15:54:31 -0700 | [diff] [blame] | 307 | if (strncasecmp(data, pattern, dlen) == 0) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 308 | return -1; |
| 309 | else return 0; |
| 310 | } |
| 311 | |
Rasmus Villemoes | 1808274 | 2014-10-13 15:54:31 -0700 | [diff] [blame] | 312 | if (strncasecmp(data, pattern, plen) != 0) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 313 | #if 0 |
| 314 | size_t i; |
| 315 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 316 | pr_debug("ftp: string mismatch\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 317 | for (i = 0; i < plen; i++) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 318 | pr_debug("ftp:char %u `%c'(%u) vs `%c'(%u)\n", |
| 319 | i, data[i], data[i], |
| 320 | pattern[i], pattern[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 321 | } |
| 322 | #endif |
| 323 | return 0; |
| 324 | } |
| 325 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 326 | pr_debug("Pattern matches!\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 327 | /* Now we've found the constant string, try to skip |
| 328 | to the 'skip' character */ |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 329 | if (skip) { |
| 330 | for (i = plen; data[i] != skip; i++) |
| 331 | if (i == dlen - 1) return -1; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 332 | |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 333 | /* Skip over the last character */ |
| 334 | i++; |
| 335 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 336 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 337 | pr_debug("Skipped up to `%c'!\n", skip); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 338 | |
| 339 | *numoff = i; |
Jeff Mahoney | 4e7dba9 | 2013-05-22 14:59:10 +0200 | [diff] [blame] | 340 | *numlen = getnum(data + i, dlen - i, cmd, term, numoff); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 341 | if (!*numlen) |
| 342 | return -1; |
| 343 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 344 | pr_debug("Match succeeded!\n"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 345 | return 1; |
| 346 | } |
| 347 | |
| 348 | /* Look up to see if we're just after a \n. */ |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 349 | static int find_nl_seq(u32 seq, const struct nf_ct_ftp_master *info, int dir) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 350 | { |
| 351 | unsigned int i; |
| 352 | |
| 353 | for (i = 0; i < info->seq_aft_nl_num[dir]; i++) |
| 354 | if (info->seq_aft_nl[dir][i] == seq) |
| 355 | return 1; |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | /* We don't update if it's older than what we have. */ |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 360 | static void update_nl_seq(struct nf_conn *ct, u32 nl_seq, |
| 361 | struct nf_ct_ftp_master *info, int dir, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 362 | struct sk_buff *skb) |
| 363 | { |
Patrick McHardy | aaff23a | 2010-01-07 18:33:18 +0100 | [diff] [blame] | 364 | unsigned int i, oldest; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 365 | |
| 366 | /* Look for oldest: if we find exact match, we're done. */ |
| 367 | for (i = 0; i < info->seq_aft_nl_num[dir]; i++) { |
| 368 | if (info->seq_aft_nl[dir][i] == nl_seq) |
| 369 | return; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) { |
| 373 | info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq; |
Patrick McHardy | aaff23a | 2010-01-07 18:33:18 +0100 | [diff] [blame] | 374 | } else { |
| 375 | if (before(info->seq_aft_nl[dir][0], info->seq_aft_nl[dir][1])) |
| 376 | oldest = 0; |
| 377 | else |
| 378 | oldest = 1; |
| 379 | |
| 380 | if (after(nl_seq, info->seq_aft_nl[dir][oldest])) |
| 381 | info->seq_aft_nl[dir][oldest] = nl_seq; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 382 | } |
| 383 | } |
| 384 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 385 | static int help(struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 386 | unsigned int protoff, |
| 387 | struct nf_conn *ct, |
| 388 | enum ip_conntrack_info ctinfo) |
| 389 | { |
| 390 | unsigned int dataoff, datalen; |
Jan Engelhardt | 58c0fb0 | 2008-04-14 11:15:42 +0200 | [diff] [blame] | 391 | const struct tcphdr *th; |
| 392 | struct tcphdr _tcph; |
| 393 | const char *fb_ptr; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 394 | int ret; |
| 395 | u32 seq; |
| 396 | int dir = CTINFO2DIR(ctinfo); |
Ingo Molnar | d6e8cc6 | 2008-11-25 18:23:03 +0100 | [diff] [blame] | 397 | unsigned int uninitialized_var(matchlen), uninitialized_var(matchoff); |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 398 | struct nf_ct_ftp_master *ct_ftp_info = nfct_help_data(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 399 | struct nf_conntrack_expect *exp; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 400 | union nf_inet_addr *daddr; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 401 | struct nf_conntrack_man cmd = {}; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 402 | unsigned int i; |
| 403 | int found = 0, ends_in_nl; |
Patrick McHardy | 337fbc4 | 2006-11-29 02:35:25 +0100 | [diff] [blame] | 404 | typeof(nf_nat_ftp_hook) nf_nat_ftp; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 405 | |
| 406 | /* Until there's been traffic both ways, don't look in packets. */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 407 | if (ctinfo != IP_CT_ESTABLISHED && |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 408 | ctinfo != IP_CT_ESTABLISHED_REPLY) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 409 | pr_debug("ftp: Conntrackinfo = %u\n", ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 410 | return NF_ACCEPT; |
| 411 | } |
| 412 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 413 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 414 | if (th == NULL) |
| 415 | return NF_ACCEPT; |
| 416 | |
| 417 | dataoff = protoff + th->doff * 4; |
| 418 | /* No data? */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 419 | if (dataoff >= skb->len) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 420 | pr_debug("ftp: dataoff(%u) >= skblen(%u)\n", dataoff, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 421 | skb->len); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 422 | return NF_ACCEPT; |
| 423 | } |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 424 | datalen = skb->len - dataoff; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 425 | |
| 426 | spin_lock_bh(&nf_ftp_lock); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 427 | fb_ptr = skb_header_pointer(skb, dataoff, datalen, ftp_buffer); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 428 | BUG_ON(fb_ptr == NULL); |
| 429 | |
| 430 | ends_in_nl = (fb_ptr[datalen - 1] == '\n'); |
| 431 | seq = ntohl(th->seq) + datalen; |
| 432 | |
| 433 | /* Look up to see if we're just after a \n. */ |
| 434 | if (!find_nl_seq(ntohl(th->seq), ct_ftp_info, dir)) { |
Pablo Neira Ayuso | 7be54ca | 2012-09-21 16:52:08 +0200 | [diff] [blame] | 435 | /* We're picking up this, clear flags and let it continue */ |
| 436 | if (unlikely(ct_ftp_info->flags[dir] & NF_CT_FTP_SEQ_PICKUP)) { |
| 437 | ct_ftp_info->flags[dir] ^= NF_CT_FTP_SEQ_PICKUP; |
| 438 | goto skip_nl_seq; |
| 439 | } |
| 440 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 441 | /* Now if this ends in \n, update ftp info. */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 442 | pr_debug("nf_conntrack_ftp: wrong seq pos %s(%u) or %s(%u)\n", |
| 443 | ct_ftp_info->seq_aft_nl_num[dir] > 0 ? "" : "(UNSET)", |
| 444 | ct_ftp_info->seq_aft_nl[dir][0], |
| 445 | ct_ftp_info->seq_aft_nl_num[dir] > 1 ? "" : "(UNSET)", |
| 446 | ct_ftp_info->seq_aft_nl[dir][1]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 447 | ret = NF_ACCEPT; |
| 448 | goto out_update_nl; |
| 449 | } |
| 450 | |
Pablo Neira Ayuso | 7be54ca | 2012-09-21 16:52:08 +0200 | [diff] [blame] | 451 | skip_nl_seq: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 452 | /* Initialize IP/IPv6 addr to expected address (it's not mentioned |
| 453 | in EPSV responses) */ |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 454 | cmd.l3num = nf_ct_l3num(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 455 | memcpy(cmd.u3.all, &ct->tuplehash[dir].tuple.src.u3.all, |
| 456 | sizeof(cmd.u3.all)); |
| 457 | |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 458 | for (i = 0; i < ARRAY_SIZE(search[dir]); i++) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 459 | found = find_pattern(fb_ptr, datalen, |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 460 | search[dir][i].pattern, |
| 461 | search[dir][i].plen, |
| 462 | search[dir][i].skip, |
| 463 | search[dir][i].term, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 464 | &matchoff, &matchlen, |
| 465 | &cmd, |
Patrick McHardy | 7d8c501 | 2006-05-29 18:25:38 -0700 | [diff] [blame] | 466 | search[dir][i].getnum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 467 | if (found) break; |
| 468 | } |
| 469 | if (found == -1) { |
| 470 | /* We don't usually drop packets. After all, this is |
| 471 | connection tracking, not packet filtering. |
| 472 | However, it is necessary for accurate tracking in |
| 473 | this case. */ |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 474 | nf_ct_helper_log(skb, ct, "partial matching of `%s'", |
| 475 | search[dir][i].pattern); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 476 | ret = NF_DROP; |
| 477 | goto out; |
| 478 | } else if (found == 0) { /* No match */ |
| 479 | ret = NF_ACCEPT; |
| 480 | goto out_update_nl; |
| 481 | } |
| 482 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 483 | pr_debug("conntrack_ftp: match `%.*s' (%u bytes at %u)\n", |
| 484 | matchlen, fb_ptr + matchoff, |
| 485 | matchlen, ntohl(th->seq) + matchoff); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 486 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 487 | exp = nf_ct_expect_alloc(ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 488 | if (exp == NULL) { |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 489 | nf_ct_helper_log(skb, ct, "cannot alloc expectation"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 490 | ret = NF_DROP; |
| 491 | goto out; |
| 492 | } |
| 493 | |
| 494 | /* We refer to the reverse direction ("!dir") tuples here, |
| 495 | * because we're expecting something in the other direction. |
| 496 | * Doesn't matter unless NAT is happening. */ |
Patrick McHardy | df43b4e | 2007-07-07 22:31:07 -0700 | [diff] [blame] | 497 | daddr = &ct->tuplehash[!dir].tuple.dst.u3; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 498 | |
| 499 | /* Update the ftp info */ |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 500 | if ((cmd.l3num == nf_ct_l3num(ct)) && |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 501 | memcmp(&cmd.u3.all, &ct->tuplehash[dir].tuple.src.u3.all, |
| 502 | sizeof(cmd.u3.all))) { |
| 503 | /* Enrico Scholz's passive FTP to partially RNAT'd ftp |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 504 | server: it really wants us to connect to a |
| 505 | different IP address. Simply don't record it for |
| 506 | NAT. */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 507 | if (cmd.l3num == PF_INET) { |
Harvey Harrison | 14d5e83 | 2008-10-31 00:54:29 -0700 | [diff] [blame] | 508 | pr_debug("conntrack_ftp: NOT RECORDING: %pI4 != %pI4\n", |
| 509 | &cmd.u3.ip, |
| 510 | &ct->tuplehash[dir].tuple.src.u3.ip); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 511 | } else { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 512 | pr_debug("conntrack_ftp: NOT RECORDING: %pI6 != %pI6\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 513 | cmd.u3.ip6, |
| 514 | ct->tuplehash[dir].tuple.src.u3.ip6); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | /* Thanks to Cristiano Lincoln Mattos |
| 518 | <lincoln@cesar.org.br> for reporting this potential |
| 519 | problem (DMZ machines opening holes to internal |
| 520 | networks, or the packet filter itself). */ |
| 521 | if (!loose) { |
| 522 | ret = NF_ACCEPT; |
| 523 | goto out_put_expect; |
| 524 | } |
Patrick McHardy | df43b4e | 2007-07-07 22:31:07 -0700 | [diff] [blame] | 525 | daddr = &cmd.u3; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 526 | } |
| 527 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 528 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, cmd.l3num, |
Patrick McHardy | df43b4e | 2007-07-07 22:31:07 -0700 | [diff] [blame] | 529 | &ct->tuplehash[!dir].tuple.src.u3, daddr, |
| 530 | IPPROTO_TCP, NULL, &cmd.u.tcp.port); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 531 | |
| 532 | /* Now, NAT might want to mangle the packet, and register the |
| 533 | * (possibly changed) expectation itself. */ |
Patrick McHardy | 337fbc4 | 2006-11-29 02:35:25 +0100 | [diff] [blame] | 534 | nf_nat_ftp = rcu_dereference(nf_nat_ftp_hook); |
Patrick McHardy | d33cbee | 2012-08-26 19:14:20 +0200 | [diff] [blame] | 535 | if (nf_nat_ftp && ct->status & IPS_NAT_MASK) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 536 | ret = nf_nat_ftp(skb, ctinfo, search[dir][i].ftptype, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 537 | protoff, matchoff, matchlen, exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 538 | else { |
| 539 | /* Can't expect this? Best to drop packet now. */ |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 540 | if (nf_ct_expect_related(exp) != 0) { |
| 541 | nf_ct_helper_log(skb, ct, "cannot add expectation"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 542 | ret = NF_DROP; |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 543 | } else |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 544 | ret = NF_ACCEPT; |
| 545 | } |
| 546 | |
| 547 | out_put_expect: |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 548 | nf_ct_expect_put(exp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 549 | |
| 550 | out_update_nl: |
| 551 | /* Now if this ends in \n, update ftp info. Seq may have been |
| 552 | * adjusted by NAT code. */ |
| 553 | if (ends_in_nl) |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 554 | update_nl_seq(ct, seq, ct_ftp_info, dir, skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 555 | out: |
| 556 | spin_unlock_bh(&nf_ftp_lock); |
| 557 | return ret; |
| 558 | } |
| 559 | |
Pablo Neira Ayuso | 7be54ca | 2012-09-21 16:52:08 +0200 | [diff] [blame] | 560 | static int nf_ct_ftp_from_nlattr(struct nlattr *attr, struct nf_conn *ct) |
| 561 | { |
| 562 | struct nf_ct_ftp_master *ftp = nfct_help_data(ct); |
| 563 | |
| 564 | /* This conntrack has been injected from user-space, always pick up |
| 565 | * sequence tracking. Otherwise, the first FTP command after the |
| 566 | * failover breaks. |
| 567 | */ |
| 568 | ftp->flags[IP_CT_DIR_ORIGINAL] |= NF_CT_FTP_SEQ_PICKUP; |
| 569 | ftp->flags[IP_CT_DIR_REPLY] |= NF_CT_FTP_SEQ_PICKUP; |
| 570 | return 0; |
| 571 | } |
| 572 | |
Patrick McHardy | ec59a11 | 2007-07-07 22:37:03 -0700 | [diff] [blame] | 573 | static struct nf_conntrack_helper ftp[MAX_PORTS][2] __read_mostly; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 574 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 575 | static const struct nf_conntrack_expect_policy ftp_exp_policy = { |
| 576 | .max_expected = 1, |
| 577 | .timeout = 5 * 60, |
| 578 | }; |
| 579 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 580 | /* don't make this __exit, since it's called from __init ! */ |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 581 | static void nf_conntrack_ftp_fini(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 582 | { |
| 583 | int i, j; |
| 584 | for (i = 0; i < ports_c; i++) { |
| 585 | for (j = 0; j < 2; j++) { |
| 586 | if (ftp[i][j].me == NULL) |
| 587 | continue; |
| 588 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 589 | pr_debug("nf_ct_ftp: unregistering helper for pf: %d " |
| 590 | "port: %d\n", |
| 591 | ftp[i][j].tuple.src.l3num, ports[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 592 | nf_conntrack_helper_unregister(&ftp[i][j]); |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | kfree(ftp_buffer); |
| 597 | } |
| 598 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 599 | static int __init nf_conntrack_ftp_init(void) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 600 | { |
| 601 | int i, j = -1, ret = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 602 | |
| 603 | ftp_buffer = kmalloc(65536, GFP_KERNEL); |
| 604 | if (!ftp_buffer) |
| 605 | return -ENOMEM; |
| 606 | |
| 607 | if (ports_c == 0) |
| 608 | ports[ports_c++] = FTP_PORT; |
| 609 | |
| 610 | /* FIXME should be configurable whether IPv4 and IPv6 FTP connections |
| 611 | are tracked or not - YK */ |
| 612 | for (i = 0; i < ports_c; i++) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 613 | ftp[i][0].tuple.src.l3num = PF_INET; |
| 614 | ftp[i][1].tuple.src.l3num = PF_INET6; |
| 615 | for (j = 0; j < 2; j++) { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 616 | ftp[i][j].data_len = sizeof(struct nf_ct_ftp_master); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 617 | ftp[i][j].tuple.src.u.tcp.port = htons(ports[i]); |
| 618 | ftp[i][j].tuple.dst.protonum = IPPROTO_TCP; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 619 | ftp[i][j].expect_policy = &ftp_exp_policy; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 620 | ftp[i][j].me = THIS_MODULE; |
| 621 | ftp[i][j].help = help; |
Pablo Neira Ayuso | 7be54ca | 2012-09-21 16:52:08 +0200 | [diff] [blame] | 622 | ftp[i][j].from_nlattr = nf_ct_ftp_from_nlattr; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 623 | if (ports[i] == FTP_PORT) |
Pablo Neira Ayuso | 3a8fc53 | 2012-01-15 16:34:08 +0100 | [diff] [blame] | 624 | sprintf(ftp[i][j].name, "ftp"); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 625 | else |
Pablo Neira Ayuso | 3a8fc53 | 2012-01-15 16:34:08 +0100 | [diff] [blame] | 626 | sprintf(ftp[i][j].name, "ftp-%d", ports[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 627 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 628 | pr_debug("nf_ct_ftp: registering helper for pf: %d " |
| 629 | "port: %d\n", |
| 630 | ftp[i][j].tuple.src.l3num, ports[i]); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 631 | ret = nf_conntrack_helper_register(&ftp[i][j]); |
| 632 | if (ret) { |
Stephen Hemminger | 654d0fb | 2010-05-13 15:02:08 +0200 | [diff] [blame] | 633 | printk(KERN_ERR "nf_ct_ftp: failed to register" |
| 634 | " helper for pf: %d port: %d\n", |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 635 | ftp[i][j].tuple.src.l3num, ports[i]); |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 636 | nf_conntrack_ftp_fini(); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 637 | return ret; |
| 638 | } |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | return 0; |
| 643 | } |
| 644 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 645 | module_init(nf_conntrack_ftp_init); |
| 646 | module_exit(nf_conntrack_ftp_fini); |