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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 19 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 20 | #include <net/net_namespace.h> |
| 21 | #include <net/netns/generic.h> |
| 22 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 23 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 24 | #include <net/netfilter/nf_conntrack.h> |
| 25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Pablo Neira Ayuso | b38b1f6 | 2009-05-25 17:29:43 +0200 | [diff] [blame] | 26 | #include <net/netfilter/nf_conntrack_ecache.h> |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 27 | #include <net/netfilter/nf_log.h> |
| 28 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 29 | /* Timeouts are based on values from RFC4340: |
| 30 | * |
| 31 | * - REQUEST: |
| 32 | * |
| 33 | * 8.1.2. Client Request |
| 34 | * |
| 35 | * A client MAY give up on its DCCP-Requests after some time |
| 36 | * (3 minutes, for example). |
| 37 | * |
| 38 | * - RESPOND: |
| 39 | * |
| 40 | * 8.1.3. Server Response |
| 41 | * |
| 42 | * It MAY also leave the RESPOND state for CLOSED after a timeout of |
| 43 | * not less than 4MSL (8 minutes); |
| 44 | * |
| 45 | * - PARTOPEN: |
| 46 | * |
| 47 | * 8.1.5. Handshake Completion |
| 48 | * |
| 49 | * If the client remains in PARTOPEN for more than 4MSL (8 minutes), |
| 50 | * it SHOULD reset the connection with Reset Code 2, "Aborted". |
| 51 | * |
| 52 | * - OPEN: |
| 53 | * |
| 54 | * The DCCP timestamp overflows after 11.9 hours. If the connection |
| 55 | * stays idle this long the sequence number won't be recognized |
| 56 | * as valid anymore. |
| 57 | * |
| 58 | * - CLOSEREQ/CLOSING: |
| 59 | * |
| 60 | * 8.3. Termination |
| 61 | * |
| 62 | * The retransmission timer should initially be set to go off in two |
| 63 | * round-trip times and should back off to not less than once every |
| 64 | * 64 seconds ... |
| 65 | * |
| 66 | * - TIMEWAIT: |
| 67 | * |
| 68 | * 4.3. States |
| 69 | * |
| 70 | * A server or client socket remains in this state for 2MSL (4 minutes) |
| 71 | * after the connection has been town down, ... |
| 72 | */ |
| 73 | |
| 74 | #define DCCP_MSL (2 * 60 * HZ) |
| 75 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 76 | static const char * const dccp_state_names[] = { |
| 77 | [CT_DCCP_NONE] = "NONE", |
| 78 | [CT_DCCP_REQUEST] = "REQUEST", |
| 79 | [CT_DCCP_RESPOND] = "RESPOND", |
| 80 | [CT_DCCP_PARTOPEN] = "PARTOPEN", |
| 81 | [CT_DCCP_OPEN] = "OPEN", |
| 82 | [CT_DCCP_CLOSEREQ] = "CLOSEREQ", |
| 83 | [CT_DCCP_CLOSING] = "CLOSING", |
| 84 | [CT_DCCP_TIMEWAIT] = "TIMEWAIT", |
| 85 | [CT_DCCP_IGNORE] = "IGNORE", |
| 86 | [CT_DCCP_INVALID] = "INVALID", |
| 87 | }; |
| 88 | |
| 89 | #define sNO CT_DCCP_NONE |
| 90 | #define sRQ CT_DCCP_REQUEST |
| 91 | #define sRS CT_DCCP_RESPOND |
| 92 | #define sPO CT_DCCP_PARTOPEN |
| 93 | #define sOP CT_DCCP_OPEN |
| 94 | #define sCR CT_DCCP_CLOSEREQ |
| 95 | #define sCG CT_DCCP_CLOSING |
| 96 | #define sTW CT_DCCP_TIMEWAIT |
| 97 | #define sIG CT_DCCP_IGNORE |
| 98 | #define sIV CT_DCCP_INVALID |
| 99 | |
| 100 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 101 | * DCCP state transition table |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 102 | * |
| 103 | * The assumption is the same as for TCP tracking: |
| 104 | * |
| 105 | * We are the man in the middle. All the packets go through us but might |
| 106 | * get lost in transit to the destination. It is assumed that the destination |
| 107 | * can't receive segments we haven't seen. |
| 108 | * |
| 109 | * The following states exist: |
| 110 | * |
| 111 | * NONE: Initial state, expecting Request |
| 112 | * REQUEST: Request seen, waiting for Response from server |
| 113 | * RESPOND: Response from server seen, waiting for Ack from client |
| 114 | * PARTOPEN: Ack after Response seen, waiting for packet other than Response, |
| 115 | * Reset or Sync from server |
| 116 | * OPEN: Packet other than Response, Reset or Sync seen |
| 117 | * CLOSEREQ: CloseReq from server seen, expecting Close from client |
| 118 | * CLOSING: Close seen, expecting Reset |
| 119 | * TIMEWAIT: Reset seen |
| 120 | * IGNORE: Not determinable whether packet is valid |
| 121 | * |
| 122 | * Some states exist only on one side of the connection: REQUEST, RESPOND, |
| 123 | * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to |
| 124 | * the one it was in before. |
| 125 | * |
| 126 | * Packets are marked as ignored (sIG) if we don't know if they're valid |
| 127 | * (for example a reincarnation of a connection we didn't notice is dead |
| 128 | * already) and the server may send back a connection closing Reset or a |
| 129 | * Response. They're also used for Sync/SyncAck packets, which we don't |
| 130 | * care about. |
| 131 | */ |
| 132 | static const u_int8_t |
| 133 | dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = { |
| 134 | [CT_DCCP_ROLE_CLIENT] = { |
| 135 | [DCCP_PKT_REQUEST] = { |
| 136 | /* |
| 137 | * sNO -> sRQ Regular Request |
| 138 | * sRQ -> sRQ Retransmitted Request or reincarnation |
| 139 | * sRS -> sRS Retransmitted Request (apparently Response |
| 140 | * got lost after we saw it) or reincarnation |
| 141 | * sPO -> sIG Ignore, conntrack might be out of sync |
| 142 | * sOP -> sIG Ignore, conntrack might be out of sync |
| 143 | * sCR -> sIG Ignore, conntrack might be out of sync |
| 144 | * sCG -> sIG Ignore, conntrack might be out of sync |
| 145 | * sTW -> sRQ Reincarnation |
| 146 | * |
| 147 | * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */ |
| 148 | sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ, |
| 149 | }, |
| 150 | [DCCP_PKT_RESPONSE] = { |
| 151 | /* |
| 152 | * sNO -> sIV Invalid |
| 153 | * sRQ -> sIG Ignore, might be response to ignored Request |
| 154 | * sRS -> sIG Ignore, might be response to ignored Request |
| 155 | * sPO -> sIG Ignore, might be response to ignored Request |
| 156 | * sOP -> sIG Ignore, might be response to ignored Request |
| 157 | * sCR -> sIG Ignore, might be response to ignored Request |
| 158 | * sCG -> sIG Ignore, might be response to ignored Request |
| 159 | * sTW -> sIV Invalid, reincarnation in reverse direction |
| 160 | * goes through sRQ |
| 161 | * |
| 162 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 163 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV, |
| 164 | }, |
| 165 | [DCCP_PKT_ACK] = { |
| 166 | /* |
| 167 | * sNO -> sIV No connection |
| 168 | * sRQ -> sIV No connection |
| 169 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) |
| 170 | * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN |
| 171 | * sOP -> sOP Regular ACK, remain in OPEN |
| 172 | * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.) |
| 173 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) |
| 174 | * sTW -> sIV |
| 175 | * |
| 176 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 177 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV |
| 178 | }, |
| 179 | [DCCP_PKT_DATA] = { |
| 180 | /* |
| 181 | * sNO -> sIV No connection |
| 182 | * sRQ -> sIV No connection |
| 183 | * sRS -> sIV No connection |
| 184 | * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.) |
| 185 | * sOP -> sOP Regular Data packet |
| 186 | * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.) |
| 187 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
| 188 | * sTW -> sIV |
| 189 | * |
| 190 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 191 | sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV, |
| 192 | }, |
| 193 | [DCCP_PKT_DATAACK] = { |
| 194 | /* |
| 195 | * sNO -> sIV No connection |
| 196 | * sRQ -> sIV No connection |
| 197 | * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.) |
| 198 | * sPO -> sPO Remain in PARTOPEN state |
| 199 | * sOP -> sOP Regular DataAck packet in OPEN state |
| 200 | * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.) |
| 201 | * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.) |
| 202 | * sTW -> sIV |
| 203 | * |
| 204 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 205 | sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV |
| 206 | }, |
| 207 | [DCCP_PKT_CLOSEREQ] = { |
| 208 | /* |
| 209 | * CLOSEREQ may only be sent by the server. |
| 210 | * |
| 211 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 212 | sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV |
| 213 | }, |
| 214 | [DCCP_PKT_CLOSE] = { |
| 215 | /* |
| 216 | * sNO -> sIV No connection |
| 217 | * sRQ -> sIV No connection |
| 218 | * sRS -> sIV No connection |
| 219 | * sPO -> sCG Client-initiated close |
| 220 | * sOP -> sCG Client-initiated close |
| 221 | * sCR -> sCG Close in response to CloseReq (8.3.) |
| 222 | * sCG -> sCG Retransmit |
| 223 | * sTW -> sIV Late retransmit, already in TIME_WAIT |
| 224 | * |
| 225 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 226 | sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV |
| 227 | }, |
| 228 | [DCCP_PKT_RESET] = { |
| 229 | /* |
| 230 | * sNO -> sIV No connection |
| 231 | * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.) |
| 232 | * sRS -> sTW Response received without Request |
| 233 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.) |
| 234 | * sOP -> sTW Connection reset |
| 235 | * sCR -> sTW Connection reset |
| 236 | * sCG -> sTW Connection reset |
| 237 | * sTW -> sIG Ignore (don't refresh timer) |
| 238 | * |
| 239 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 240 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG |
| 241 | }, |
| 242 | [DCCP_PKT_SYNC] = { |
| 243 | /* |
| 244 | * We currently ignore Sync packets |
| 245 | * |
| 246 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 247 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 248 | }, |
| 249 | [DCCP_PKT_SYNCACK] = { |
| 250 | /* |
| 251 | * We currently ignore SyncAck packets |
| 252 | * |
| 253 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 254 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 255 | }, |
| 256 | }, |
| 257 | [CT_DCCP_ROLE_SERVER] = { |
| 258 | [DCCP_PKT_REQUEST] = { |
| 259 | /* |
| 260 | * sNO -> sIV Invalid |
| 261 | * sRQ -> sIG Ignore, conntrack might be out of sync |
| 262 | * sRS -> sIG Ignore, conntrack might be out of sync |
| 263 | * sPO -> sIG Ignore, conntrack might be out of sync |
| 264 | * sOP -> sIG Ignore, conntrack might be out of sync |
| 265 | * sCR -> sIG Ignore, conntrack might be out of sync |
| 266 | * sCG -> sIG Ignore, conntrack might be out of sync |
| 267 | * sTW -> sRQ Reincarnation, must reverse roles |
| 268 | * |
| 269 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 270 | sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ |
| 271 | }, |
| 272 | [DCCP_PKT_RESPONSE] = { |
| 273 | /* |
| 274 | * sNO -> sIV Response without Request |
| 275 | * sRQ -> sRS Response to clients Request |
| 276 | * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT) |
| 277 | * sPO -> sIG Response to an ignored Request or late retransmit |
| 278 | * sOP -> sIG Ignore, might be response to ignored Request |
| 279 | * sCR -> sIG Ignore, might be response to ignored Request |
| 280 | * sCG -> sIG Ignore, might be response to ignored Request |
| 281 | * sTW -> sIV Invalid, Request from client in sTW moves to sRQ |
| 282 | * |
| 283 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 284 | sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV |
| 285 | }, |
| 286 | [DCCP_PKT_ACK] = { |
| 287 | /* |
| 288 | * sNO -> sIV No connection |
| 289 | * sRQ -> sIV No connection |
| 290 | * sRS -> sIV No connection |
| 291 | * sPO -> sOP Enter OPEN state (8.1.5.) |
| 292 | * sOP -> sOP Regular Ack in OPEN state |
| 293 | * sCR -> sIV Waiting for Close from client |
| 294 | * sCG -> sCG Ack in CLOSING MAY be processed (8.3.) |
| 295 | * sTW -> sIV |
| 296 | * |
| 297 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 298 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
| 299 | }, |
| 300 | [DCCP_PKT_DATA] = { |
| 301 | /* |
| 302 | * sNO -> sIV No connection |
| 303 | * sRQ -> sIV No connection |
| 304 | * sRS -> sIV No connection |
| 305 | * sPO -> sOP Enter OPEN state (8.1.5.) |
| 306 | * sOP -> sOP Regular Data packet in OPEN state |
| 307 | * sCR -> sIV Waiting for Close from client |
| 308 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
| 309 | * sTW -> sIV |
| 310 | * |
| 311 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 312 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
| 313 | }, |
| 314 | [DCCP_PKT_DATAACK] = { |
| 315 | /* |
| 316 | * sNO -> sIV No connection |
| 317 | * sRQ -> sIV No connection |
| 318 | * sRS -> sIV No connection |
| 319 | * sPO -> sOP Enter OPEN state (8.1.5.) |
| 320 | * sOP -> sOP Regular DataAck in OPEN state |
| 321 | * sCR -> sIV Waiting for Close from client |
| 322 | * sCG -> sCG Data in CLOSING MAY be processed (8.3.) |
| 323 | * sTW -> sIV |
| 324 | * |
| 325 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 326 | sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV |
| 327 | }, |
| 328 | [DCCP_PKT_CLOSEREQ] = { |
| 329 | /* |
| 330 | * sNO -> sIV No connection |
| 331 | * sRQ -> sIV No connection |
| 332 | * sRS -> sIV No connection |
| 333 | * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.) |
| 334 | * sOP -> sCR CloseReq in OPEN state |
| 335 | * sCR -> sCR Retransmit |
| 336 | * sCG -> sCR Simultaneous close, client sends another Close |
| 337 | * sTW -> sIV Already closed |
| 338 | * |
| 339 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 340 | sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV |
| 341 | }, |
| 342 | [DCCP_PKT_CLOSE] = { |
| 343 | /* |
| 344 | * sNO -> sIV No connection |
| 345 | * sRQ -> sIV No connection |
| 346 | * sRS -> sIV No connection |
| 347 | * sPO -> sOP -> sCG Move direcly to CLOSING |
| 348 | * sOP -> sCG Move to CLOSING |
| 349 | * sCR -> sIV Close after CloseReq is invalid |
| 350 | * sCG -> sCG Retransmit |
| 351 | * sTW -> sIV Already closed |
| 352 | * |
| 353 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 354 | sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV |
| 355 | }, |
| 356 | [DCCP_PKT_RESET] = { |
| 357 | /* |
| 358 | * sNO -> sIV No connection |
| 359 | * sRQ -> sTW Reset in response to Request |
| 360 | * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.) |
| 361 | * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.) |
| 362 | * sOP -> sTW |
| 363 | * sCR -> sTW |
| 364 | * sCG -> sTW |
| 365 | * sTW -> sIG Ignore (don't refresh timer) |
| 366 | * |
| 367 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */ |
| 368 | sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG |
| 369 | }, |
| 370 | [DCCP_PKT_SYNC] = { |
| 371 | /* |
| 372 | * We currently ignore Sync packets |
| 373 | * |
| 374 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 375 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 376 | }, |
| 377 | [DCCP_PKT_SYNCACK] = { |
| 378 | /* |
| 379 | * We currently ignore SyncAck packets |
| 380 | * |
| 381 | * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ |
| 382 | sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, |
| 383 | }, |
| 384 | }, |
| 385 | }; |
| 386 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 387 | /* this module per-net specifics */ |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 388 | static int dccp_net_id __read_mostly; |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 389 | struct dccp_net { |
| 390 | int dccp_loose; |
| 391 | unsigned int dccp_timeout[CT_DCCP_MAX + 1]; |
| 392 | #ifdef CONFIG_SYSCTL |
| 393 | struct ctl_table_header *sysctl_header; |
| 394 | struct ctl_table *sysctl_table; |
| 395 | #endif |
| 396 | }; |
| 397 | |
| 398 | static inline struct dccp_net *dccp_pernet(struct net *net) |
| 399 | { |
| 400 | return net_generic(net, dccp_net_id); |
| 401 | } |
| 402 | |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 403 | static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
| 404 | struct nf_conntrack_tuple *tuple) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 405 | { |
| 406 | struct dccp_hdr _hdr, *dh; |
| 407 | |
| 408 | dh = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); |
| 409 | if (dh == NULL) |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 410 | return false; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 411 | |
| 412 | tuple->src.u.dccp.port = dh->dccph_sport; |
| 413 | tuple->dst.u.dccp.port = dh->dccph_dport; |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 414 | return true; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 415 | } |
| 416 | |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 417 | static bool dccp_invert_tuple(struct nf_conntrack_tuple *inv, |
| 418 | const struct nf_conntrack_tuple *tuple) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 419 | { |
| 420 | inv->src.u.dccp.port = tuple->dst.u.dccp.port; |
| 421 | inv->dst.u.dccp.port = tuple->src.u.dccp.port; |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 422 | return true; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 423 | } |
| 424 | |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 425 | static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb, |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 426 | unsigned int dataoff, unsigned int *timeouts) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 427 | { |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 428 | struct net *net = nf_ct_net(ct); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 429 | struct dccp_net *dn; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 430 | struct dccp_hdr _dh, *dh; |
| 431 | const char *msg; |
| 432 | u_int8_t state; |
| 433 | |
| 434 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); |
| 435 | BUG_ON(dh == NULL); |
| 436 | |
| 437 | state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE]; |
| 438 | switch (state) { |
| 439 | default: |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 440 | dn = dccp_pernet(net); |
| 441 | if (dn->dccp_loose == 0) { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 442 | msg = "nf_ct_dccp: not picking up existing connection "; |
| 443 | goto out_invalid; |
| 444 | } |
| 445 | case CT_DCCP_REQUEST: |
| 446 | break; |
| 447 | case CT_DCCP_INVALID: |
| 448 | msg = "nf_ct_dccp: invalid state transition "; |
| 449 | goto out_invalid; |
| 450 | } |
| 451 | |
| 452 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; |
| 453 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; |
| 454 | ct->proto.dccp.state = CT_DCCP_NONE; |
Changli Gao | e5fc9e7 | 2010-11-12 17:33:17 +0100 | [diff] [blame] | 455 | ct->proto.dccp.last_pkt = DCCP_PKT_REQUEST; |
| 456 | ct->proto.dccp.last_dir = IP_CT_DIR_ORIGINAL; |
| 457 | ct->proto.dccp.handshake_seq = 0; |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 458 | return true; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 459 | |
| 460 | out_invalid: |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 461 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 462 | 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] | 463 | return false; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | static u64 dccp_ack_seq(const struct dccp_hdr *dh) |
| 467 | { |
| 468 | const struct dccp_hdr_ack_bits *dhack; |
| 469 | |
| 470 | dhack = (void *)dh + __dccp_basic_hdr_len(dh); |
| 471 | return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + |
| 472 | ntohl(dhack->dccph_ack_nr_low); |
| 473 | } |
| 474 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 475 | static unsigned int *dccp_get_timeouts(struct net *net) |
| 476 | { |
| 477 | return dccp_pernet(net)->dccp_timeout; |
| 478 | } |
| 479 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 480 | static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb, |
| 481 | unsigned int dataoff, enum ip_conntrack_info ctinfo, |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 482 | u_int8_t pf, unsigned int hooknum, |
| 483 | unsigned int *timeouts) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 484 | { |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 485 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 486 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
| 487 | struct dccp_hdr _dh, *dh; |
| 488 | u_int8_t type, old_state, new_state; |
| 489 | enum ct_dccp_roles role; |
| 490 | |
| 491 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); |
| 492 | BUG_ON(dh == NULL); |
| 493 | type = dh->dccph_type; |
| 494 | |
| 495 | if (type == DCCP_PKT_RESET && |
| 496 | !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
| 497 | /* Tear down connection immediately if only reply is a RESET */ |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 498 | nf_ct_kill_acct(ct, ctinfo, skb); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 499 | return NF_ACCEPT; |
| 500 | } |
| 501 | |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 502 | spin_lock_bh(&ct->lock); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 503 | |
| 504 | role = ct->proto.dccp.role[dir]; |
| 505 | old_state = ct->proto.dccp.state; |
| 506 | new_state = dccp_state_table[role][type][old_state]; |
| 507 | |
| 508 | switch (new_state) { |
| 509 | case CT_DCCP_REQUEST: |
| 510 | if (old_state == CT_DCCP_TIMEWAIT && |
| 511 | role == CT_DCCP_ROLE_SERVER) { |
| 512 | /* Reincarnation in the reverse direction: reopen and |
| 513 | * reverse client/server roles. */ |
| 514 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT; |
| 515 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER; |
| 516 | } |
| 517 | break; |
| 518 | case CT_DCCP_RESPOND: |
| 519 | if (old_state == CT_DCCP_REQUEST) |
| 520 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); |
| 521 | break; |
| 522 | case CT_DCCP_PARTOPEN: |
| 523 | if (old_state == CT_DCCP_RESPOND && |
| 524 | type == DCCP_PKT_ACK && |
| 525 | dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq) |
| 526 | set_bit(IPS_ASSURED_BIT, &ct->status); |
| 527 | break; |
| 528 | case CT_DCCP_IGNORE: |
| 529 | /* |
| 530 | * Connection tracking might be out of sync, so we ignore |
| 531 | * packets that might establish a new connection and resync |
| 532 | * if the server responds with a valid Response. |
| 533 | */ |
| 534 | if (ct->proto.dccp.last_dir == !dir && |
| 535 | ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST && |
| 536 | type == DCCP_PKT_RESPONSE) { |
| 537 | ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT; |
| 538 | ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER; |
| 539 | ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh); |
| 540 | new_state = CT_DCCP_RESPOND; |
| 541 | break; |
| 542 | } |
| 543 | ct->proto.dccp.last_dir = dir; |
| 544 | ct->proto.dccp.last_pkt = type; |
| 545 | |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 546 | spin_unlock_bh(&ct->lock); |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 547 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 548 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 549 | "nf_ct_dccp: invalid packet ignored "); |
| 550 | return NF_ACCEPT; |
| 551 | case CT_DCCP_INVALID: |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 552 | spin_unlock_bh(&ct->lock); |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 553 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 554 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 555 | "nf_ct_dccp: invalid state transition "); |
| 556 | return -NF_ACCEPT; |
| 557 | } |
| 558 | |
| 559 | ct->proto.dccp.last_dir = dir; |
| 560 | ct->proto.dccp.last_pkt = type; |
| 561 | ct->proto.dccp.state = new_state; |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 562 | spin_unlock_bh(&ct->lock); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 563 | |
Pablo Neira Ayuso | b38b1f6 | 2009-05-25 17:29:43 +0200 | [diff] [blame] | 564 | if (new_state != old_state) |
| 565 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
| 566 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 567 | nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 568 | |
| 569 | return NF_ACCEPT; |
| 570 | } |
| 571 | |
Patrick McHardy | 8fea97e | 2010-02-15 17:45:08 +0100 | [diff] [blame] | 572 | static int dccp_error(struct net *net, struct nf_conn *tmpl, |
| 573 | struct sk_buff *skb, unsigned int dataoff, |
| 574 | enum ip_conntrack_info *ctinfo, |
Alexey Dobriyan | 74c51a1 | 2008-10-08 11:35:05 +0200 | [diff] [blame] | 575 | u_int8_t pf, unsigned int hooknum) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 576 | { |
| 577 | struct dccp_hdr _dh, *dh; |
| 578 | unsigned int dccp_len = skb->len - dataoff; |
| 579 | unsigned int cscov; |
| 580 | const char *msg; |
| 581 | |
| 582 | dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); |
| 583 | if (dh == NULL) { |
| 584 | msg = "nf_ct_dccp: short packet "; |
| 585 | goto out_invalid; |
| 586 | } |
| 587 | |
| 588 | if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) || |
| 589 | dh->dccph_doff * 4 > dccp_len) { |
| 590 | msg = "nf_ct_dccp: truncated/malformed packet "; |
| 591 | goto out_invalid; |
| 592 | } |
| 593 | |
| 594 | cscov = dccp_len; |
| 595 | if (dh->dccph_cscov) { |
| 596 | cscov = (dh->dccph_cscov - 1) * 4; |
| 597 | if (cscov > dccp_len) { |
| 598 | msg = "nf_ct_dccp: bad checksum coverage "; |
| 599 | goto out_invalid; |
| 600 | } |
| 601 | } |
| 602 | |
Alexey Dobriyan | c04d055 | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 603 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 604 | nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP, |
| 605 | pf)) { |
| 606 | msg = "nf_ct_dccp: bad checksum "; |
| 607 | goto out_invalid; |
| 608 | } |
| 609 | |
| 610 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
| 611 | msg = "nf_ct_dccp: reserved packet type "; |
| 612 | goto out_invalid; |
| 613 | } |
| 614 | |
| 615 | return NF_ACCEPT; |
| 616 | |
| 617 | out_invalid: |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 618 | if (LOG_INVALID(net, IPPROTO_DCCP)) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 619 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, msg); |
| 620 | return -NF_ACCEPT; |
| 621 | } |
| 622 | |
| 623 | static int dccp_print_tuple(struct seq_file *s, |
| 624 | const struct nf_conntrack_tuple *tuple) |
| 625 | { |
| 626 | return seq_printf(s, "sport=%hu dport=%hu ", |
| 627 | ntohs(tuple->src.u.dccp.port), |
| 628 | ntohs(tuple->dst.u.dccp.port)); |
| 629 | } |
| 630 | |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 631 | static int dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 632 | { |
| 633 | return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]); |
| 634 | } |
| 635 | |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 636 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 637 | static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 638 | struct nf_conn *ct) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 639 | { |
| 640 | struct nlattr *nest_parms; |
| 641 | |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 642 | spin_lock_bh(&ct->lock); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 643 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED); |
| 644 | if (!nest_parms) |
| 645 | goto nla_put_failure; |
| 646 | 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] | 647 | NLA_PUT_U8(skb, CTA_PROTOINFO_DCCP_ROLE, |
| 648 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]); |
Pablo Neira Ayuso | a17c859 | 2009-05-27 17:50:35 +0200 | [diff] [blame] | 649 | NLA_PUT_BE64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ, |
| 650 | cpu_to_be64(ct->proto.dccp.handshake_seq)); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 651 | nla_nest_end(skb, nest_parms); |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 652 | spin_unlock_bh(&ct->lock); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 653 | return 0; |
| 654 | |
| 655 | nla_put_failure: |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 656 | spin_unlock_bh(&ct->lock); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 657 | return -1; |
| 658 | } |
| 659 | |
| 660 | static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = { |
| 661 | [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 }, |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 662 | [CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 }, |
Pablo Neira Ayuso | a17c859 | 2009-05-27 17:50:35 +0200 | [diff] [blame] | 663 | [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 }, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 664 | }; |
| 665 | |
| 666 | static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct) |
| 667 | { |
| 668 | struct nlattr *attr = cda[CTA_PROTOINFO_DCCP]; |
| 669 | struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1]; |
| 670 | int err; |
| 671 | |
| 672 | if (!attr) |
| 673 | return 0; |
| 674 | |
| 675 | err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr, |
| 676 | dccp_nla_policy); |
| 677 | if (err < 0) |
| 678 | return err; |
| 679 | |
| 680 | if (!tb[CTA_PROTOINFO_DCCP_STATE] || |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 681 | !tb[CTA_PROTOINFO_DCCP_ROLE] || |
| 682 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX || |
| 683 | nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 684 | return -EINVAL; |
Pablo Neira Ayuso | 71951b6 | 2009-04-24 16:58:41 +0200 | [diff] [blame] | 685 | } |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 686 | |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 687 | spin_lock_bh(&ct->lock); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 688 | 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] | 689 | if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) { |
| 690 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT; |
| 691 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER; |
| 692 | } else { |
| 693 | ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER; |
| 694 | ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT; |
| 695 | } |
Pablo Neira Ayuso | a17c859 | 2009-05-27 17:50:35 +0200 | [diff] [blame] | 696 | if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) { |
| 697 | ct->proto.dccp.handshake_seq = |
| 698 | be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ])); |
| 699 | } |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 700 | spin_unlock_bh(&ct->lock); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 701 | return 0; |
| 702 | } |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 703 | |
| 704 | static int dccp_nlattr_size(void) |
| 705 | { |
| 706 | return nla_total_size(0) /* CTA_PROTOINFO_DCCP */ |
| 707 | + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1); |
| 708 | } |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame^] | 709 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 710 | #endif |
| 711 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame^] | 712 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
| 713 | |
| 714 | #include <linux/netfilter/nfnetlink.h> |
| 715 | #include <linux/netfilter/nfnetlink_cttimeout.h> |
| 716 | |
| 717 | static int dccp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) |
| 718 | { |
| 719 | struct dccp_net *dn = dccp_pernet(&init_net); |
| 720 | unsigned int *timeouts = data; |
| 721 | int i; |
| 722 | |
| 723 | /* set default DCCP timeouts. */ |
| 724 | for (i=0; i<CT_DCCP_MAX; i++) |
| 725 | timeouts[i] = dn->dccp_timeout[i]; |
| 726 | |
| 727 | /* there's a 1:1 mapping between attributes and protocol states. */ |
| 728 | for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) { |
| 729 | if (tb[i]) { |
| 730 | timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; |
| 731 | } |
| 732 | } |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | static int |
| 737 | dccp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) |
| 738 | { |
| 739 | const unsigned int *timeouts = data; |
| 740 | int i; |
| 741 | |
| 742 | for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) |
| 743 | NLA_PUT_BE32(skb, i, htonl(timeouts[i] / HZ)); |
| 744 | |
| 745 | return 0; |
| 746 | |
| 747 | nla_put_failure: |
| 748 | return -ENOSPC; |
| 749 | } |
| 750 | |
| 751 | static const struct nla_policy |
| 752 | dccp_timeout_nla_policy[CTA_TIMEOUT_DCCP_MAX+1] = { |
| 753 | [CTA_TIMEOUT_DCCP_REQUEST] = { .type = NLA_U32 }, |
| 754 | [CTA_TIMEOUT_DCCP_RESPOND] = { .type = NLA_U32 }, |
| 755 | [CTA_TIMEOUT_DCCP_PARTOPEN] = { .type = NLA_U32 }, |
| 756 | [CTA_TIMEOUT_DCCP_OPEN] = { .type = NLA_U32 }, |
| 757 | [CTA_TIMEOUT_DCCP_CLOSEREQ] = { .type = NLA_U32 }, |
| 758 | [CTA_TIMEOUT_DCCP_CLOSING] = { .type = NLA_U32 }, |
| 759 | [CTA_TIMEOUT_DCCP_TIMEWAIT] = { .type = NLA_U32 }, |
| 760 | }; |
| 761 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
| 762 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 763 | #ifdef CONFIG_SYSCTL |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 764 | /* template, data assigned later */ |
| 765 | static struct ctl_table dccp_sysctl_table[] = { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 766 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 767 | .procname = "nf_conntrack_dccp_timeout_request", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 768 | .maxlen = sizeof(unsigned int), |
| 769 | .mode = 0644, |
| 770 | .proc_handler = proc_dointvec_jiffies, |
| 771 | }, |
| 772 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 773 | .procname = "nf_conntrack_dccp_timeout_respond", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 774 | .maxlen = sizeof(unsigned int), |
| 775 | .mode = 0644, |
| 776 | .proc_handler = proc_dointvec_jiffies, |
| 777 | }, |
| 778 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 779 | .procname = "nf_conntrack_dccp_timeout_partopen", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 780 | .maxlen = sizeof(unsigned int), |
| 781 | .mode = 0644, |
| 782 | .proc_handler = proc_dointvec_jiffies, |
| 783 | }, |
| 784 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 785 | .procname = "nf_conntrack_dccp_timeout_open", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 786 | .maxlen = sizeof(unsigned int), |
| 787 | .mode = 0644, |
| 788 | .proc_handler = proc_dointvec_jiffies, |
| 789 | }, |
| 790 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 791 | .procname = "nf_conntrack_dccp_timeout_closereq", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 792 | .maxlen = sizeof(unsigned int), |
| 793 | .mode = 0644, |
| 794 | .proc_handler = proc_dointvec_jiffies, |
| 795 | }, |
| 796 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 797 | .procname = "nf_conntrack_dccp_timeout_closing", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 798 | .maxlen = sizeof(unsigned int), |
| 799 | .mode = 0644, |
| 800 | .proc_handler = proc_dointvec_jiffies, |
| 801 | }, |
| 802 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 803 | .procname = "nf_conntrack_dccp_timeout_timewait", |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 804 | .maxlen = sizeof(unsigned int), |
| 805 | .mode = 0644, |
| 806 | .proc_handler = proc_dointvec_jiffies, |
| 807 | }, |
| 808 | { |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 809 | .procname = "nf_conntrack_dccp_loose", |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 810 | .maxlen = sizeof(int), |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 811 | .mode = 0644, |
| 812 | .proc_handler = proc_dointvec, |
| 813 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 814 | { } |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 815 | }; |
| 816 | #endif /* CONFIG_SYSCTL */ |
| 817 | |
| 818 | static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = { |
| 819 | .l3proto = AF_INET, |
| 820 | .l4proto = IPPROTO_DCCP, |
| 821 | .name = "dccp", |
| 822 | .pkt_to_tuple = dccp_pkt_to_tuple, |
| 823 | .invert_tuple = dccp_invert_tuple, |
| 824 | .new = dccp_new, |
| 825 | .packet = dccp_packet, |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 826 | .get_timeouts = dccp_get_timeouts, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 827 | .error = dccp_error, |
| 828 | .print_tuple = dccp_print_tuple, |
| 829 | .print_conntrack = dccp_print_conntrack, |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 830 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 831 | .to_nlattr = dccp_to_nlattr, |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 832 | .nlattr_size = dccp_nlattr_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 833 | .from_nlattr = nlattr_to_dccp, |
| 834 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 835 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 836 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
| 837 | .nla_policy = nf_ct_port_nla_policy, |
| 838 | #endif |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame^] | 839 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
| 840 | .ctnl_timeout = { |
| 841 | .nlattr_to_obj = dccp_timeout_nlattr_to_obj, |
| 842 | .obj_to_nlattr = dccp_timeout_obj_to_nlattr, |
| 843 | .nlattr_max = CTA_TIMEOUT_DCCP_MAX, |
| 844 | .obj_size = sizeof(unsigned int) * CT_DCCP_MAX, |
| 845 | .nla_policy = dccp_timeout_nla_policy, |
| 846 | }, |
| 847 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 848 | }; |
| 849 | |
| 850 | static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = { |
| 851 | .l3proto = AF_INET6, |
| 852 | .l4proto = IPPROTO_DCCP, |
| 853 | .name = "dccp", |
| 854 | .pkt_to_tuple = dccp_pkt_to_tuple, |
| 855 | .invert_tuple = dccp_invert_tuple, |
| 856 | .new = dccp_new, |
| 857 | .packet = dccp_packet, |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 858 | .get_timeouts = dccp_get_timeouts, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 859 | .error = dccp_error, |
| 860 | .print_tuple = dccp_print_tuple, |
| 861 | .print_conntrack = dccp_print_conntrack, |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 862 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 863 | .to_nlattr = dccp_to_nlattr, |
Patrick McHardy | 5ff4829 | 2009-04-24 15:37:44 +0200 | [diff] [blame] | 864 | .nlattr_size = dccp_nlattr_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 865 | .from_nlattr = nlattr_to_dccp, |
| 866 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
Holger Eitzenberger | a400c30 | 2009-03-25 21:53:39 +0100 | [diff] [blame] | 867 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 868 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
| 869 | .nla_policy = nf_ct_port_nla_policy, |
| 870 | #endif |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame^] | 871 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
| 872 | .ctnl_timeout = { |
| 873 | .nlattr_to_obj = dccp_timeout_nlattr_to_obj, |
| 874 | .obj_to_nlattr = dccp_timeout_obj_to_nlattr, |
| 875 | .nlattr_max = CTA_TIMEOUT_DCCP_MAX, |
| 876 | .obj_size = sizeof(unsigned int) * CT_DCCP_MAX, |
| 877 | .nla_policy = dccp_timeout_nla_policy, |
| 878 | }, |
| 879 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 880 | }; |
| 881 | |
| 882 | static __net_init int dccp_net_init(struct net *net) |
| 883 | { |
Eric W. Biederman | 32b51f9 | 2009-11-29 15:46:07 +0000 | [diff] [blame] | 884 | struct dccp_net *dn = dccp_pernet(net); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 885 | |
| 886 | /* default values */ |
| 887 | dn->dccp_loose = 1; |
| 888 | dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL; |
| 889 | dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL; |
| 890 | dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL; |
| 891 | dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ; |
| 892 | dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ; |
| 893 | dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ; |
| 894 | dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL; |
| 895 | |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 896 | #ifdef CONFIG_SYSCTL |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 897 | dn->sysctl_table = kmemdup(dccp_sysctl_table, |
| 898 | sizeof(dccp_sysctl_table), GFP_KERNEL); |
| 899 | if (!dn->sysctl_table) |
Eric W. Biederman | 32b51f9 | 2009-11-29 15:46:07 +0000 | [diff] [blame] | 900 | return -ENOMEM; |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 901 | |
| 902 | dn->sysctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST]; |
| 903 | dn->sysctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND]; |
| 904 | dn->sysctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN]; |
| 905 | dn->sysctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN]; |
| 906 | dn->sysctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ]; |
| 907 | dn->sysctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING]; |
| 908 | dn->sysctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT]; |
| 909 | dn->sysctl_table[7].data = &dn->dccp_loose; |
| 910 | |
| 911 | dn->sysctl_header = register_net_sysctl_table(net, |
| 912 | nf_net_netfilter_sysctl_path, dn->sysctl_table); |
| 913 | if (!dn->sysctl_header) { |
| 914 | kfree(dn->sysctl_table); |
Eric W. Biederman | 32b51f9 | 2009-11-29 15:46:07 +0000 | [diff] [blame] | 915 | return -ENOMEM; |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 916 | } |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 917 | #endif |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 918 | |
| 919 | return 0; |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | static __net_exit void dccp_net_exit(struct net *net) |
| 923 | { |
| 924 | struct dccp_net *dn = dccp_pernet(net); |
| 925 | #ifdef CONFIG_SYSCTL |
| 926 | unregister_net_sysctl_table(dn->sysctl_header); |
| 927 | kfree(dn->sysctl_table); |
| 928 | #endif |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | static struct pernet_operations dccp_net_ops = { |
| 932 | .init = dccp_net_init, |
| 933 | .exit = dccp_net_exit, |
Eric W. Biederman | 32b51f9 | 2009-11-29 15:46:07 +0000 | [diff] [blame] | 934 | .id = &dccp_net_id, |
| 935 | .size = sizeof(struct dccp_net), |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 936 | }; |
| 937 | |
| 938 | static int __init nf_conntrack_proto_dccp_init(void) |
| 939 | { |
| 940 | int err; |
| 941 | |
Eric W. Biederman | 32b51f9 | 2009-11-29 15:46:07 +0000 | [diff] [blame] | 942 | err = register_pernet_subsys(&dccp_net_ops); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 943 | if (err < 0) |
| 944 | goto err1; |
| 945 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 946 | err = nf_conntrack_l4proto_register(&dccp_proto4); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 947 | if (err < 0) |
| 948 | goto err2; |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 949 | |
| 950 | err = nf_conntrack_l4proto_register(&dccp_proto6); |
| 951 | if (err < 0) |
| 952 | goto err3; |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 953 | return 0; |
| 954 | |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 955 | err3: |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 956 | nf_conntrack_l4proto_unregister(&dccp_proto4); |
Cyrill Gorcunov | 1546000 | 2009-03-16 16:30:49 +0100 | [diff] [blame] | 957 | err2: |
Eric W. Biederman | 32b51f9 | 2009-11-29 15:46:07 +0000 | [diff] [blame] | 958 | unregister_pernet_subsys(&dccp_net_ops); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 959 | err1: |
| 960 | return err; |
| 961 | } |
| 962 | |
| 963 | static void __exit nf_conntrack_proto_dccp_fini(void) |
| 964 | { |
Eric W. Biederman | 32b51f9 | 2009-11-29 15:46:07 +0000 | [diff] [blame] | 965 | unregister_pernet_subsys(&dccp_net_ops); |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 966 | nf_conntrack_l4proto_unregister(&dccp_proto6); |
| 967 | nf_conntrack_l4proto_unregister(&dccp_proto4); |
| 968 | } |
| 969 | |
| 970 | module_init(nf_conntrack_proto_dccp_init); |
| 971 | module_exit(nf_conntrack_proto_dccp_fini); |
| 972 | |
| 973 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 974 | MODULE_DESCRIPTION("DCCP connection tracking protocol helper"); |
| 975 | MODULE_LICENSE("GPL"); |