Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * DCCP connection tracking protocol helper |
| 3 | * |
| 4 | * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net> |
| 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 | */ |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/sysctl.h> |
| 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/dccp.h> |
| 18 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 19 | #include <net/net_namespace.h> |
| 20 | #include <net/netns/generic.h> |
| 21 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 22 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 23 | #include <net/netfilter/nf_conntrack.h> |
| 24 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Pablo Neira Ayuso | b38b1f6 | 2009-05-25 17:29:43 +0200 | [diff] [blame^] | 25 | #include <net/netfilter/nf_conntrack_ecache.h> |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 26 | #include <net/netfilter/nf_log.h> |
| 27 | |
| 28 | static DEFINE_RWLOCK(dccp_lock); |
| 29 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 30 | /* Timeouts are based on values from RFC4340: |
| 31 | * |
| 32 | * - REQUEST: |
| 33 | * |
| 34 | * 8.1.2. Client Request |
| 35 | * |
| 36 | * A client MAY give up on its DCCP-Requests after some time |
| 37 | * (3 minutes, for example). |
| 38 | * |
| 39 | * - RESPOND: |
| 40 | * |
| 41 | * 8.1.3. Server Response |
| 42 | * |
| 43 | * It MAY also leave the RESPOND state for CLOSED after a timeout of |
| 44 | * not less than 4MSL (8 minutes); |
| 45 | * |
| 46 | * - PARTOPEN: |
| 47 | * |
| 48 | * 8.1.5. Handshake Completion |
| 49 | * |
| 50 | * If the client remains in PARTOPEN for more than 4MSL (8 minutes), |
| 51 | * it SHOULD reset the connection with Reset Code 2, "Aborted". |
| 52 | * |
| 53 | * - OPEN: |
| 54 | * |
| 55 | * The DCCP timestamp overflows after 11.9 hours. If the connection |
| 56 | * stays idle this long the sequence number won't be recognized |
| 57 | * as valid anymore. |
| 58 | * |
| 59 | * - CLOSEREQ/CLOSING: |
| 60 | * |
| 61 | * 8.3. Termination |
| 62 | * |
| 63 | * The retransmission timer should initially be set to go off in two |
| 64 | * round-trip times and should back off to not less than once every |
| 65 | * 64 seconds ... |
| 66 | * |
| 67 | * - TIMEWAIT: |
| 68 | * |
| 69 | * 4.3. States |
| 70 | * |
| 71 | * A server or client socket remains in this state for 2MSL (4 minutes) |
| 72 | * after the connection has been town down, ... |
| 73 | */ |
| 74 | |
| 75 | #define DCCP_MSL (2 * 60 * HZ) |
| 76 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 77 | static const char * const dccp_state_names[] = { |
| 78 | [CT_DCCP_NONE] = "NONE", |
| 79 | [CT_DCCP_REQUEST] = "REQUEST", |
| 80 | [CT_DCCP_RESPOND] = "RESPOND", |
| 81 | [CT_DCCP_PARTOPEN] = "PARTOPEN", |
| 82 | [CT_DCCP_OPEN] = "OPEN", |
| 83 | [CT_DCCP_CLOSEREQ] = "CLOSEREQ", |
| 84 | [CT_DCCP_CLOSING] = "CLOSING", |
| 85 | [CT_DCCP_TIMEWAIT] = "TIMEWAIT", |
| 86 | [CT_DCCP_IGNORE] = "IGNORE", |
| 87 | [CT_DCCP_INVALID] = "INVALID", |
| 88 | }; |
| 89 | |
| 90 | #define sNO CT_DCCP_NONE |
| 91 | #define sRQ CT_DCCP_REQUEST |
| 92 | #define sRS CT_DCCP_RESPOND |
| 93 | #define sPO CT_DCCP_PARTOPEN |
| 94 | #define sOP CT_DCCP_OPEN |
| 95 | #define sCR CT_DCCP_CLOSEREQ |
| 96 | #define sCG CT_DCCP_CLOSING |
| 97 | #define sTW CT_DCCP_TIMEWAIT |
| 98 | #define sIG CT_DCCP_IGNORE |
| 99 | #define sIV CT_DCCP_INVALID |
| 100 | |
| 101 | /* |
| 102 | * DCCP state transistion table |
| 103 | * |
| 104 | * The assumption is the same as for TCP tracking: |
| 105 | * |
| 106 | * We are the man in the middle. All the packets go through us but might |
| 107 | * get lost in transit to the destination. It is assumed that the destination |
| 108 | * can't receive segments we haven't seen. |
| 109 | * |
| 110 | * The following states exist: |
| 111 | * |
| 112 | * NONE: Initial state, expecting Request |
| 113 | * REQUEST: Request seen, waiting for Response from server |
| 114 | * RESPOND: Response from server seen, waiting for Ack from client |
| 115 | * PARTOPEN: Ack after Response seen, waiting for packet other than Response, |
| 116 | * Reset or Sync from server |
| 117 | * OPEN: Packet other than Response, Reset or Sync seen |
| 118 | * CLOSEREQ: CloseReq from server seen, expecting Close from client |
| 119 | * CLOSING: Close seen, expecting Reset |
| 120 | * TIMEWAIT: Reset seen |
| 121 | * IGNORE: Not determinable whether packet is valid |
| 122 | * |
| 123 | * Some states exist only on one side of the connection: REQUEST, RESPOND, |
| 124 | * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to |
| 125 | * the one it was in before. |
| 126 | * |
| 127 | * Packets are marked as ignored (sIG) if we don't know if they're valid |
| 128 | * (for example a reincarnation of a connection we didn't notice is dead |
| 129 | * already) and the server may send back a connection closing Reset or a |
| 130 | * Response. They're also used for Sync/SyncAck packets, which we don't |
| 131 | * care about. |
| 132 | */ |
| 133 | static const u_int8_t |
| 134 | dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = { |
| 135 | [CT_DCCP_ROLE_CLIENT] = { |
| 136 | [DCCP_PKT_REQUEST] = { |
| 137 | /* |
| 138 | * sNO -> sRQ Regular Request |
| 139 | * sRQ -> sRQ Retransmitted Request or reincarnation |
| 140 | * sRS -> sRS Retransmitted Request (apparently Response |
| 141 | * got lost after we saw it) or reincarnation |
| 142 | * sPO -> sIG Ignore, conntrack might be out of sync |
| 143 | * sOP -> sIG Ignore, conntrack might be out of sync |
| 144 | * sCR -> sIG Ignore, conntrack might be out of sync |
| 145 | * sCG -> sIG Ignore, conntrack might be out of sync |
| 146 | * sTW -> sRQ Reincarnation |
| 147 | * |
| 148 | * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */ |
| 149 | sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ, |
| 150 | }, |
| 151 | [DCCP_PKT_RESPONSE] = { |
| 152 | /* |
| 153 | * sNO -> sIV Invalid |
| 154 | * sRQ -> sIG Ignore, might be response to ignored Request |
| 155 | * sRS -> sIG Ignore, might be response to ignored Request |
| 156 | * sPO -> sIG Ignore, might be response to ignored Request |
| 157 | * sOP -> sIG Ignore, might be response to ignored Request |
| 158 | * sCR -> sIG Ignore, might be response to ignored Request |
| 159 | * sCG -> sIG Ignore, might be response to ignored Request |
| 160 | * sTW -> sIV Invalid, reincarnation in reverse direction |
| 161 | * goes through sRQ |
| 162 | * |
| 163 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 164 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV, |
| 165 | }, |
| 166 | [DCCP_PKT_ACK] = { |
| 167 | /* |
| 168 | * sNO -> sIV No connection |
| 169 | * sRQ -> sIV No connection |
| 170 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) |
| 171 | * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN |
| 172 | * sOP -> sOP Regular ACK, remain in OPEN |
| 173 | * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.) |
| 174 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) |
| 175 | * sTW -> sIV |
| 176 | * |
| 177 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 178 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV |
| 179 | }, |
| 180 | [DCCP_PKT_DATA] = { |
| 181 | /* |
| 182 | * sNO -> sIV No connection |
| 183 | * sRQ -> sIV No connection |
| 184 | * sRS -> sIV No connection |
| 185 | * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.) |
| 186 | * sOP -> sOP Regular Data packet |
| 187 | * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.) |
| 188 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
| 189 | * sTW -> sIV |
| 190 | * |
| 191 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 192 | sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV, |
| 193 | }, |
| 194 | [DCCP_PKT_DATAACK] = { |
| 195 | /* |
| 196 | * sNO -> sIV No connection |
| 197 | * sRQ -> sIV No connection |
| 198 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) |
| 199 | * sPO -> sPO Remain in PARTOPEN state |
| 200 | * sOP -> sOP Regular DataAck packet in OPEN state |
| 201 | * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.) |
| 202 | * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.) |
| 203 | * sTW -> sIV |
| 204 | * |
| 205 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 206 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV |
| 207 | }, |
| 208 | [DCCP_PKT_CLOSEREQ] = { |
| 209 | /* |
| 210 | * CLOSEREQ may only be sent by the server. |
| 211 | * |
| 212 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 213 | sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV |
| 214 | }, |
| 215 | [DCCP_PKT_CLOSE] = { |
| 216 | /* |
| 217 | * sNO -> sIV No connection |
| 218 | * sRQ -> sIV No connection |
| 219 | * sRS -> sIV No connection |
| 220 | * sPO -> sCG Client-initiated close |
| 221 | * sOP -> sCG Client-initiated close |
| 222 | * sCR -> sCG Close in response to CloseReq (8.3.) |
| 223 | * sCG -> sCG Retransmit |
| 224 | * sTW -> sIV Late retransmit, already in TIME_WAIT |
| 225 | * |
| 226 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 227 | sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV |
| 228 | }, |
| 229 | [DCCP_PKT_RESET] = { |
| 230 | /* |
| 231 | * sNO -> sIV No connection |
| 232 | * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.) |
| 233 | * sRS -> sTW Response received without Request |
| 234 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.) |
| 235 | * sOP -> sTW Connection reset |
| 236 | * sCR -> sTW Connection reset |
| 237 | * sCG -> sTW Connection reset |
| 238 | * sTW -> sIG Ignore (don't refresh timer) |
| 239 | * |
| 240 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 241 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG |
| 242 | }, |
| 243 | [DCCP_PKT_SYNC] = { |
| 244 | /* |
| 245 | * We currently ignore Sync packets |
| 246 | * |
| 247 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 248 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 249 | }, |
| 250 | [DCCP_PKT_SYNCACK] = { |
| 251 | /* |
| 252 | * We currently ignore SyncAck packets |
| 253 | * |
| 254 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 255 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 256 | }, |
| 257 | }, |
| 258 | [CT_DCCP_ROLE_SERVER] = { |
| 259 | [DCCP_PKT_REQUEST] = { |
| 260 | /* |
| 261 | * sNO -> sIV Invalid |
| 262 | * sRQ -> sIG Ignore, conntrack might be out of sync |
| 263 | * sRS -> sIG Ignore, conntrack might be out of sync |
| 264 | * sPO -> sIG Ignore, conntrack might be out of sync |
| 265 | * sOP -> sIG Ignore, conntrack might be out of sync |
| 266 | * sCR -> sIG Ignore, conntrack might be out of sync |
| 267 | * sCG -> sIG Ignore, conntrack might be out of sync |
| 268 | * sTW -> sRQ Reincarnation, must reverse roles |
| 269 | * |
| 270 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 271 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ |
| 272 | }, |
| 273 | [DCCP_PKT_RESPONSE] = { |
| 274 | /* |
| 275 | * sNO -> sIV Response without Request |
| 276 | * sRQ -> sRS Response to clients Request |
| 277 | * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT) |
| 278 | * sPO -> sIG Response to an ignored Request or late retransmit |
| 279 | * sOP -> sIG Ignore, might be response to ignored Request |
| 280 | * sCR -> sIG Ignore, might be response to ignored Request |
| 281 | * sCG -> sIG Ignore, might be response to ignored Request |
| 282 | * sTW -> sIV Invalid, Request from client in sTW moves to sRQ |
| 283 | * |
| 284 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 285 | sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV |
| 286 | }, |
| 287 | [DCCP_PKT_ACK] = { |
| 288 | /* |
| 289 | * sNO -> sIV No connection |
| 290 | * sRQ -> sIV No connection |
| 291 | * sRS -> sIV No connection |
| 292 | * sPO -> sOP Enter OPEN state (8.1.5.) |
| 293 | * sOP -> sOP Regular Ack in OPEN state |
| 294 | * sCR -> sIV Waiting for Close from client |
| 295 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) |
| 296 | * sTW -> sIV |
| 297 | * |
| 298 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 299 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
| 300 | }, |
| 301 | [DCCP_PKT_DATA] = { |
| 302 | /* |
| 303 | * sNO -> sIV No connection |
| 304 | * sRQ -> sIV No connection |
| 305 | * sRS -> sIV No connection |
| 306 | * sPO -> sOP Enter OPEN state (8.1.5.) |
| 307 | * sOP -> sOP Regular Data packet in OPEN state |
| 308 | * sCR -> sIV Waiting for Close from client |
| 309 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
| 310 | * sTW -> sIV |
| 311 | * |
| 312 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 313 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
| 314 | }, |
| 315 | [DCCP_PKT_DATAACK] = { |
| 316 | /* |
| 317 | * sNO -> sIV No connection |
| 318 | * sRQ -> sIV No connection |
| 319 | * sRS -> sIV No connection |
| 320 | * sPO -> sOP Enter OPEN state (8.1.5.) |
| 321 | * sOP -> sOP Regular DataAck in OPEN state |
| 322 | * sCR -> sIV Waiting for Close from client |
| 323 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
| 324 | * sTW -> sIV |
| 325 | * |
| 326 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 327 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
| 328 | }, |
| 329 | [DCCP_PKT_CLOSEREQ] = { |
| 330 | /* |
| 331 | * sNO -> sIV No connection |
| 332 | * sRQ -> sIV No connection |
| 333 | * sRS -> sIV No connection |
| 334 | * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.) |
| 335 | * sOP -> sCR CloseReq in OPEN state |
| 336 | * sCR -> sCR Retransmit |
| 337 | * sCG -> sCR Simultaneous close, client sends another Close |
| 338 | * sTW -> sIV Already closed |
| 339 | * |
| 340 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 341 | sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV |
| 342 | }, |
| 343 | [DCCP_PKT_CLOSE] = { |
| 344 | /* |
| 345 | * sNO -> sIV No connection |
| 346 | * sRQ -> sIV No connection |
| 347 | * sRS -> sIV No connection |
| 348 | * sPO -> sOP -> sCG Move direcly to CLOSING |
| 349 | * sOP -> sCG Move to CLOSING |
| 350 | * sCR -> sIV Close after CloseReq is invalid |
| 351 | * sCG -> sCG Retransmit |
| 352 | * sTW -> sIV Already closed |
| 353 | * |
| 354 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 355 | sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV |
| 356 | }, |
| 357 | [DCCP_PKT_RESET] = { |
| 358 | /* |
| 359 | * sNO -> sIV No connection |
| 360 | * sRQ -> sTW Reset in response to Request |
| 361 | * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.) |
| 362 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.) |
| 363 | * sOP -> sTW |
| 364 | * sCR -> sTW |
| 365 | * sCG -> sTW |
| 366 | * sTW -> sIG Ignore (don't refresh timer) |
| 367 | * |
| 368 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */ |
| 369 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG |
| 370 | }, |
| 371 | [DCCP_PKT_SYNC] = { |
| 372 | /* |
| 373 | * We currently ignore Sync packets |
| 374 | * |
| 375 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 376 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 377 | }, |
| 378 | [DCCP_PKT_SYNCACK] = { |
| 379 | /* |
| 380 | * We currently ignore SyncAck packets |
| 381 | * |
| 382 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 383 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 384 | }, |
| 385 | }, |
| 386 | }; |
| 387 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 388 | /* this module per-net specifics */ |
| 389 | static int dccp_net_id; |
| 390 | struct dccp_net { |
| 391 | int dccp_loose; |
| 392 | unsigned int dccp_timeout[CT_DCCP_MAX + 1]; |
| 393 | #ifdef CONFIG_SYSCTL |
| 394 | struct ctl_table_header *sysctl_header; |
| 395 | struct ctl_table *sysctl_table; |
| 396 | #endif |
| 397 | }; |
| 398 | |
| 399 | static inline struct dccp_net *dccp_pernet(struct net *net) |
| 400 | { |
| 401 | return net_generic(net, dccp_net_id); |
| 402 | } |
| 403 | |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 404 | static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
| 405 | struct nf_conntrack_tuple *tuple) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 406 | { |
| 407 | struct dccp_hdr _hdr, *dh; |
| 408 | |
| 409 | dh = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); |
| 410 | if (dh == NULL) |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 411 | return false; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 412 | |
| 413 | tuple->src.u.dccp.port = dh->dccph_sport; |
| 414 | tuple->dst.u.dccp.port = dh->dccph_dport; |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 415 | return true; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 416 | } |
| 417 | |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 418 | static bool dccp_invert_tuple(struct nf_conntrack_tuple *inv, |
| 419 | const struct nf_conntrack_tuple *tuple) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 420 | { |
| 421 | inv->src.u.dccp.port = tuple->dst.u.dccp.port; |
| 422 | inv->dst.u.dccp.port = tuple->src.u.dccp.port; |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 423 | return true; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 424 | } |
| 425 | |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 426 | static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb, |
| 427 | unsigned int dataoff) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 428 | { |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 429 | struct net *net = nf_ct_net(ct); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 430 | struct dccp_net *dn; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 431 | struct dccp_hdr _dh, *dh; |
| 432 | const char *msg; |
| 433 | u_int8_t state; |
| 434 | |
| 435 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); |
| 436 | BUG_ON(dh == NULL); |
| 437 | |
| 438 | state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE]; |
| 439 | switch (state) { |
| 440 | default: |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 441 | dn = dccp_pernet(net); |
| 442 | if (dn->dccp_loose == 0) { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 443 | msg = "nf_ct_dccp: not picking up existing connection "; |
| 444 | goto out_invalid; |
| 445 | } |
| 446 | case CT_DCCP_REQUEST: |
| 447 | break; |
| 448 | case CT_DCCP_INVALID: |
| 449 | msg = "nf_ct_dccp: invalid state transition "; |
| 450 | goto out_invalid; |
| 451 | } |
| 452 | |
| 453 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; |
| 454 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; |
| 455 | ct->proto.dccp.state = CT_DCCP_NONE; |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 456 | return true; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 457 | |
| 458 | out_invalid: |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 459 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 460 | nf_log_packet(nf_ct_l3num(ct), 0, skb, NULL, NULL, NULL, msg); |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 461 | return false; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | static u64 dccp_ack_seq(const struct dccp_hdr *dh) |
| 465 | { |
| 466 | const struct dccp_hdr_ack_bits *dhack; |
| 467 | |
| 468 | dhack = (void *)dh + __dccp_basic_hdr_len(dh); |
| 469 | return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + |
| 470 | ntohl(dhack->dccph_ack_nr_low); |
| 471 | } |
| 472 | |
| 473 | static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb, |
| 474 | unsigned int dataoff, enum ip_conntrack_info ctinfo, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 475 | u_int8_t pf, unsigned int hooknum) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 476 | { |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 477 | struct net *net = nf_ct_net(ct); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 478 | struct dccp_net *dn; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 479 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
| 480 | struct dccp_hdr _dh, *dh; |
| 481 | u_int8_t type, old_state, new_state; |
| 482 | enum ct_dccp_roles role; |
| 483 | |
| 484 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); |
| 485 | BUG_ON(dh == NULL); |
| 486 | type = dh->dccph_type; |
| 487 | |
| 488 | if (type == DCCP_PKT_RESET && |
| 489 | !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
| 490 | /* Tear down connection immediately if only reply is a RESET */ |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 491 | nf_ct_kill_acct(ct, ctinfo, skb); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 492 | return NF_ACCEPT; |
| 493 | } |
| 494 | |
| 495 | write_lock_bh(&dccp_lock); |
| 496 | |
| 497 | role = ct->proto.dccp.role[dir]; |
| 498 | old_state = ct->proto.dccp.state; |
| 499 | new_state = dccp_state_table[role][type][old_state]; |
| 500 | |
| 501 | switch (new_state) { |
| 502 | case CT_DCCP_REQUEST: |
| 503 | if (old_state == CT_DCCP_TIMEWAIT && |
| 504 | role == CT_DCCP_ROLE_SERVER) { |
| 505 | /* Reincarnation in the reverse direction: reopen and |
| 506 | * reverse client/server roles. */ |
| 507 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT; |
| 508 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER; |
| 509 | } |
| 510 | break; |
| 511 | case CT_DCCP_RESPOND: |
| 512 | if (old_state == CT_DCCP_REQUEST) |
| 513 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); |
| 514 | break; |
| 515 | case CT_DCCP_PARTOPEN: |
| 516 | if (old_state == CT_DCCP_RESPOND && |
| 517 | type == DCCP_PKT_ACK && |
| 518 | dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq) |
| 519 | set_bit(IPS_ASSURED_BIT, &ct->status); |
| 520 | break; |
| 521 | case CT_DCCP_IGNORE: |
| 522 | /* |
| 523 | * Connection tracking might be out of sync, so we ignore |
| 524 | * packets that might establish a new connection and resync |
| 525 | * if the server responds with a valid Response. |
| 526 | */ |
| 527 | if (ct->proto.dccp.last_dir == !dir && |
| 528 | ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST && |
| 529 | type == DCCP_PKT_RESPONSE) { |
| 530 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT; |
| 531 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER; |
| 532 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); |
| 533 | new_state = CT_DCCP_RESPOND; |
| 534 | break; |
| 535 | } |
| 536 | ct->proto.dccp.last_dir = dir; |
| 537 | ct->proto.dccp.last_pkt = type; |
| 538 | |
| 539 | write_unlock_bh(&dccp_lock); |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 540 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 541 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 542 | "nf_ct_dccp: invalid packet ignored "); |
| 543 | return NF_ACCEPT; |
| 544 | case CT_DCCP_INVALID: |
| 545 | write_unlock_bh(&dccp_lock); |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 546 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 547 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 548 | "nf_ct_dccp: invalid state transition "); |
| 549 | return -NF_ACCEPT; |
| 550 | } |
| 551 | |
| 552 | ct->proto.dccp.last_dir = dir; |
| 553 | ct->proto.dccp.last_pkt = type; |
| 554 | ct->proto.dccp.state = new_state; |
| 555 | write_unlock_bh(&dccp_lock); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 556 | |
Pablo Neira Ayuso | b38b1f6 | 2009-05-25 17:29:43 +0200 | [diff] [blame^] | 557 | if (new_state != old_state) |
| 558 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
| 559 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 560 | dn = dccp_pernet(net); |
| 561 | nf_ct_refresh_acct(ct, ctinfo, skb, dn->dccp_timeout[new_state]); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 562 | |
| 563 | return NF_ACCEPT; |
| 564 | } |
| 565 | |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 566 | static int dccp_error(struct net *net, struct sk_buff *skb, |
| 567 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, |
| 568 | u_int8_t pf, unsigned int hooknum) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 569 | { |
| 570 | struct dccp_hdr _dh, *dh; |
| 571 | unsigned int dccp_len = skb->len - dataoff; |
| 572 | unsigned int cscov; |
| 573 | const char *msg; |
| 574 | |
| 575 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); |
| 576 | if (dh == NULL) { |
| 577 | msg = "nf_ct_dccp: short packet "; |
| 578 | goto out_invalid; |
| 579 | } |
| 580 | |
| 581 | if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) || |
| 582 | dh->dccph_doff * 4 > dccp_len) { |
| 583 | msg = "nf_ct_dccp: truncated/malformed packet "; |
| 584 | goto out_invalid; |
| 585 | } |
| 586 | |
| 587 | cscov = dccp_len; |
| 588 | if (dh->dccph_cscov) { |
| 589 | cscov = (dh->dccph_cscov - 1) * 4; |
| 590 | if (cscov > dccp_len) { |
| 591 | msg = "nf_ct_dccp: bad checksum coverage "; |
| 592 | goto out_invalid; |
| 593 | } |
| 594 | } |
| 595 | |
Alexey Dobriyan | c04d055 | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 596 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 597 | nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP, |
| 598 | pf)) { |
| 599 | msg = "nf_ct_dccp: bad checksum "; |
| 600 | goto out_invalid; |
| 601 | } |
| 602 | |
| 603 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
| 604 | msg = "nf_ct_dccp: reserved packet type "; |
| 605 | goto out_invalid; |
| 606 | } |
| 607 | |
| 608 | return NF_ACCEPT; |
| 609 | |
| 610 | out_invalid: |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 611 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 612 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, msg); |
| 613 | return -NF_ACCEPT; |
| 614 | } |
| 615 | |
| 616 | static int dccp_print_tuple(struct seq_file *s, |
| 617 | const struct nf_conntrack_tuple *tuple) |
| 618 | { |
| 619 | return seq_printf(s, "sport=%hu dport=%hu ", |
| 620 | ntohs(tuple->src.u.dccp.port), |
| 621 | ntohs(tuple->dst.u.dccp.port)); |
| 622 | } |
| 623 | |
| 624 | static int dccp_print_conntrack(struct seq_file *s, const struct nf_conn *ct) |
| 625 | { |
| 626 | return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]); |
| 627 | } |
| 628 | |
| 629 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
| 630 | static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
| 631 | const struct nf_conn *ct) |
| 632 | { |
| 633 | struct nlattr *nest_parms; |
| 634 | |
| 635 | read_lock_bh(&dccp_lock); |
| 636 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED); |
| 637 | if (!nest_parms) |
| 638 | goto nla_put_failure; |
| 639 | NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state); |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 640 | NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_ROLE, |
| 641 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 642 | nla_nest_end(skb, nest_parms); |
| 643 | read_unlock_bh(&dccp_lock); |
| 644 | return 0; |
| 645 | |
| 646 | nla_put_failure: |
| 647 | read_unlock_bh(&dccp_lock); |
| 648 | return -1; |
| 649 | } |
| 650 | |
| 651 | static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = { |
| 652 | [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 }, |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 653 | [CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 }, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 654 | }; |
| 655 | |
| 656 | static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct) |
| 657 | { |
| 658 | struct nlattr *attr = cda[CTA_PROTOINFO_DCCP]; |
| 659 | struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1]; |
| 660 | int err; |
| 661 | |
| 662 | if (!attr) |
| 663 | return 0; |
| 664 | |
| 665 | err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr, |
| 666 | dccp_nla_policy); |
| 667 | if (err < 0) |
| 668 | return err; |
| 669 | |
| 670 | if (!tb[CTA_PROTOINFO_DCCP_STATE] || |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 671 | !tb[CTA_PROTOINFO_DCCP_ROLE] || |
| 672 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX || |
| 673 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 674 | return -EINVAL; |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 675 | } |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 676 | |
| 677 | write_lock_bh(&dccp_lock); |
| 678 | ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]); |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 679 | if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) { |
| 680 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; |
| 681 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; |
| 682 | } else { |
| 683 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER; |
| 684 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT; |
| 685 | } |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 686 | write_unlock_bh(&dccp_lock); |
| 687 | return 0; |
| 688 | } |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 689 | |
| 690 | static int dccp_nlattr_size(void) |
| 691 | { |
| 692 | return nla_total_size(0) /* CTA_PROTOINFO_DCCP */ |
| 693 | + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1); |
| 694 | } |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 695 | #endif |
| 696 | |
| 697 | #ifdef CONFIG_SYSCTL |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 698 | /* template, data assigned later */ |
| 699 | static struct ctl_table dccp_sysctl_table[] = { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 700 | { |
| 701 | .ctl_name = CTL_UNNUMBERED, |
| 702 | .procname = "nf_conntrack_dccp_timeout_request", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 703 | .maxlen = sizeof(unsigned int), |
| 704 | .mode = 0644, |
| 705 | .proc_handler = proc_dointvec_jiffies, |
| 706 | }, |
| 707 | { |
| 708 | .ctl_name = CTL_UNNUMBERED, |
| 709 | .procname = "nf_conntrack_dccp_timeout_respond", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 710 | .maxlen = sizeof(unsigned int), |
| 711 | .mode = 0644, |
| 712 | .proc_handler = proc_dointvec_jiffies, |
| 713 | }, |
| 714 | { |
| 715 | .ctl_name = CTL_UNNUMBERED, |
| 716 | .procname = "nf_conntrack_dccp_timeout_partopen", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 717 | .maxlen = sizeof(unsigned int), |
| 718 | .mode = 0644, |
| 719 | .proc_handler = proc_dointvec_jiffies, |
| 720 | }, |
| 721 | { |
| 722 | .ctl_name = CTL_UNNUMBERED, |
| 723 | .procname = "nf_conntrack_dccp_timeout_open", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 724 | .maxlen = sizeof(unsigned int), |
| 725 | .mode = 0644, |
| 726 | .proc_handler = proc_dointvec_jiffies, |
| 727 | }, |
| 728 | { |
| 729 | .ctl_name = CTL_UNNUMBERED, |
| 730 | .procname = "nf_conntrack_dccp_timeout_closereq", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 731 | .maxlen = sizeof(unsigned int), |
| 732 | .mode = 0644, |
| 733 | .proc_handler = proc_dointvec_jiffies, |
| 734 | }, |
| 735 | { |
| 736 | .ctl_name = CTL_UNNUMBERED, |
| 737 | .procname = "nf_conntrack_dccp_timeout_closing", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 738 | .maxlen = sizeof(unsigned int), |
| 739 | .mode = 0644, |
| 740 | .proc_handler = proc_dointvec_jiffies, |
| 741 | }, |
| 742 | { |
| 743 | .ctl_name = CTL_UNNUMBERED, |
| 744 | .procname = "nf_conntrack_dccp_timeout_timewait", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 745 | .maxlen = sizeof(unsigned int), |
| 746 | .mode = 0644, |
| 747 | .proc_handler = proc_dointvec_jiffies, |
| 748 | }, |
| 749 | { |
| 750 | .ctl_name = CTL_UNNUMBERED, |
| 751 | .procname = "nf_conntrack_dccp_loose", |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 752 | .maxlen = sizeof(int), |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 753 | .mode = 0644, |
| 754 | .proc_handler = proc_dointvec, |
| 755 | }, |
| 756 | { |
| 757 | .ctl_name = 0, |
| 758 | } |
| 759 | }; |
| 760 | #endif /* CONFIG_SYSCTL */ |
| 761 | |
| 762 | static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = { |
| 763 | .l3proto = AF_INET, |
| 764 | .l4proto = IPPROTO_DCCP, |
| 765 | .name = "dccp", |
| 766 | .pkt_to_tuple = dccp_pkt_to_tuple, |
| 767 | .invert_tuple = dccp_invert_tuple, |
| 768 | .new = dccp_new, |
| 769 | .packet = dccp_packet, |
| 770 | .error = dccp_error, |
| 771 | .print_tuple = dccp_print_tuple, |
| 772 | .print_conntrack = dccp_print_conntrack, |
| 773 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
| 774 | .to_nlattr = dccp_to_nlattr, |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 775 | .nlattr_size = dccp_nlattr_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 776 | .from_nlattr = nlattr_to_dccp, |
| 777 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 778 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 779 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
| 780 | .nla_policy = nf_ct_port_nla_policy, |
| 781 | #endif |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 782 | }; |
| 783 | |
| 784 | static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = { |
| 785 | .l3proto = AF_INET6, |
| 786 | .l4proto = IPPROTO_DCCP, |
| 787 | .name = "dccp", |
| 788 | .pkt_to_tuple = dccp_pkt_to_tuple, |
| 789 | .invert_tuple = dccp_invert_tuple, |
| 790 | .new = dccp_new, |
| 791 | .packet = dccp_packet, |
| 792 | .error = dccp_error, |
| 793 | .print_tuple = dccp_print_tuple, |
| 794 | .print_conntrack = dccp_print_conntrack, |
| 795 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
| 796 | .to_nlattr = dccp_to_nlattr, |
Patrick McHardy | 5ff4829 | 2009-04-24 15:37:44 +0200 | [diff] [blame] | 797 | .nlattr_size = dccp_nlattr_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 798 | .from_nlattr = nlattr_to_dccp, |
| 799 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 800 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 801 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
| 802 | .nla_policy = nf_ct_port_nla_policy, |
| 803 | #endif |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 804 | }; |
| 805 | |
| 806 | static __net_init int dccp_net_init(struct net *net) |
| 807 | { |
| 808 | struct dccp_net *dn; |
| 809 | int err; |
| 810 | |
| 811 | dn = kmalloc(sizeof(*dn), GFP_KERNEL); |
| 812 | if (!dn) |
| 813 | return -ENOMEM; |
| 814 | |
| 815 | /* default values */ |
| 816 | dn->dccp_loose = 1; |
| 817 | dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL; |
| 818 | dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL; |
| 819 | dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL; |
| 820 | dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ; |
| 821 | dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ; |
| 822 | dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ; |
| 823 | dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL; |
| 824 | |
| 825 | err = net_assign_generic(net, dccp_net_id, dn); |
| 826 | if (err) |
| 827 | goto out; |
| 828 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 829 | #ifdef CONFIG_SYSCTL |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 830 | err = -ENOMEM; |
| 831 | dn->sysctl_table = kmemdup(dccp_sysctl_table, |
| 832 | sizeof(dccp_sysctl_table), GFP_KERNEL); |
| 833 | if (!dn->sysctl_table) |
| 834 | goto out; |
| 835 | |
| 836 | dn->sysctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST]; |
| 837 | dn->sysctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND]; |
| 838 | dn->sysctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN]; |
| 839 | dn->sysctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN]; |
| 840 | dn->sysctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ]; |
| 841 | dn->sysctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING]; |
| 842 | dn->sysctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT]; |
| 843 | dn->sysctl_table[7].data = &dn->dccp_loose; |
| 844 | |
| 845 | dn->sysctl_header = register_net_sysctl_table(net, |
| 846 | nf_net_netfilter_sysctl_path, dn->sysctl_table); |
| 847 | if (!dn->sysctl_header) { |
| 848 | kfree(dn->sysctl_table); |
| 849 | goto out; |
| 850 | } |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 851 | #endif |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 852 | |
| 853 | return 0; |
| 854 | |
| 855 | out: |
| 856 | kfree(dn); |
| 857 | return err; |
| 858 | } |
| 859 | |
| 860 | static __net_exit void dccp_net_exit(struct net *net) |
| 861 | { |
| 862 | struct dccp_net *dn = dccp_pernet(net); |
| 863 | #ifdef CONFIG_SYSCTL |
| 864 | unregister_net_sysctl_table(dn->sysctl_header); |
| 865 | kfree(dn->sysctl_table); |
| 866 | #endif |
| 867 | kfree(dn); |
| 868 | |
| 869 | net_assign_generic(net, dccp_net_id, NULL); |
| 870 | } |
| 871 | |
| 872 | static struct pernet_operations dccp_net_ops = { |
| 873 | .init = dccp_net_init, |
| 874 | .exit = dccp_net_exit, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 875 | }; |
| 876 | |
| 877 | static int __init nf_conntrack_proto_dccp_init(void) |
| 878 | { |
| 879 | int err; |
| 880 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 881 | err = register_pernet_gen_subsys(&dccp_net_id, &dccp_net_ops); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 882 | if (err < 0) |
| 883 | goto err1; |
| 884 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 885 | err = nf_conntrack_l4proto_register(&dccp_proto4); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 886 | if (err < 0) |
| 887 | goto err2; |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 888 | |
| 889 | err = nf_conntrack_l4proto_register(&dccp_proto6); |
| 890 | if (err < 0) |
| 891 | goto err3; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 892 | return 0; |
| 893 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 894 | err3: |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 895 | nf_conntrack_l4proto_unregister(&dccp_proto4); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 896 | err2: |
| 897 | unregister_pernet_gen_subsys(dccp_net_id, &dccp_net_ops); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 898 | err1: |
| 899 | return err; |
| 900 | } |
| 901 | |
| 902 | static void __exit nf_conntrack_proto_dccp_fini(void) |
| 903 | { |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 904 | unregister_pernet_gen_subsys(dccp_net_id, &dccp_net_ops); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 905 | nf_conntrack_l4proto_unregister(&dccp_proto6); |
| 906 | nf_conntrack_l4proto_unregister(&dccp_proto4); |
| 907 | } |
| 908 | |
| 909 | module_init(nf_conntrack_proto_dccp_init); |
| 910 | module_exit(nf_conntrack_proto_dccp_fini); |
| 911 | |
| 912 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 913 | MODULE_DESCRIPTION("DCCP connection tracking protocol helper"); |
| 914 | MODULE_LICENSE("GPL"); |