| 1 | /* Connection tracking via netlink socket. Allows for user space |
| 2 | * protocol helpers and general trouble making from userspace. |
| 3 | * |
| 4 | * (C) 2001 by Jay Schulist <jschlst@samba.org> |
| 5 | * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org> |
| 6 | * (C) 2003 by Patrick Mchardy <kaber@trash.net> |
| 7 | * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net> |
| 8 | * |
| 9 | * I've reworked this stuff to use attributes instead of conntrack |
| 10 | * structures. 5.44 am. I need more tea. --pablo 05/07/11. |
| 11 | * |
| 12 | * Initial connection tracking via netlink development funded and |
| 13 | * generally made possible by Network Robots, Inc. (www.networkrobots.com) |
| 14 | * |
| 15 | * Further development of this code funded by Astaro AG (http://www.astaro.com) |
| 16 | * |
| 17 | * This software may be used and distributed according to the terms |
| 18 | * of the GNU General Public License, incorporated herein by reference. |
| 19 | * |
| 20 | * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14) |
| 21 | */ |
| 22 | |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/timer.h> |
| 28 | #include <linux/skbuff.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/netlink.h> |
| 31 | #include <linux/spinlock.h> |
| 32 | #include <linux/notifier.h> |
| 33 | |
| 34 | #include <linux/netfilter.h> |
| 35 | #include <net/netfilter/nf_conntrack.h> |
| 36 | #include <net/netfilter/nf_conntrack_core.h> |
| 37 | #include <net/netfilter/nf_conntrack_helper.h> |
| 38 | #include <net/netfilter/nf_conntrack_l3proto.h> |
| 39 | #include <net/netfilter/nf_conntrack_protocol.h> |
| 40 | #include <linux/netfilter_ipv4/ip_nat_protocol.h> |
| 41 | |
| 42 | #include <linux/netfilter/nfnetlink.h> |
| 43 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 44 | |
| 45 | MODULE_LICENSE("GPL"); |
| 46 | |
| 47 | static char __initdata version[] = "0.93"; |
| 48 | |
| 49 | #if 0 |
| 50 | #define DEBUGP printk |
| 51 | #else |
| 52 | #define DEBUGP(format, args...) |
| 53 | #endif |
| 54 | |
| 55 | |
| 56 | static inline int |
| 57 | ctnetlink_dump_tuples_proto(struct sk_buff *skb, |
| 58 | const struct nf_conntrack_tuple *tuple, |
| 59 | struct nf_conntrack_protocol *proto) |
| 60 | { |
| 61 | int ret = 0; |
| 62 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO); |
| 63 | |
| 64 | NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum); |
| 65 | |
| 66 | if (likely(proto->tuple_to_nfattr)) |
| 67 | ret = proto->tuple_to_nfattr(skb, tuple); |
| 68 | |
| 69 | NFA_NEST_END(skb, nest_parms); |
| 70 | |
| 71 | return ret; |
| 72 | |
| 73 | nfattr_failure: |
| 74 | return -1; |
| 75 | } |
| 76 | |
| 77 | static inline int |
| 78 | ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
| 79 | const struct nf_conntrack_tuple *tuple, |
| 80 | struct nf_conntrack_l3proto *l3proto) |
| 81 | { |
| 82 | int ret = 0; |
| 83 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP); |
| 84 | |
| 85 | if (likely(l3proto->tuple_to_nfattr)) |
| 86 | ret = l3proto->tuple_to_nfattr(skb, tuple); |
| 87 | |
| 88 | NFA_NEST_END(skb, nest_parms); |
| 89 | |
| 90 | return ret; |
| 91 | |
| 92 | nfattr_failure: |
| 93 | return -1; |
| 94 | } |
| 95 | |
| 96 | static inline int |
| 97 | ctnetlink_dump_tuples(struct sk_buff *skb, |
| 98 | const struct nf_conntrack_tuple *tuple) |
| 99 | { |
| 100 | int ret; |
| 101 | struct nf_conntrack_l3proto *l3proto; |
| 102 | struct nf_conntrack_protocol *proto; |
| 103 | |
| 104 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 105 | ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto); |
| 106 | nf_ct_l3proto_put(l3proto); |
| 107 | |
| 108 | if (unlikely(ret < 0)) |
| 109 | return ret; |
| 110 | |
| 111 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| 112 | ret = ctnetlink_dump_tuples_proto(skb, tuple, proto); |
| 113 | nf_ct_proto_put(proto); |
| 114 | |
| 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | static inline int |
| 119 | ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) |
| 120 | { |
| 121 | u_int32_t status = htonl((u_int32_t) ct->status); |
| 122 | NFA_PUT(skb, CTA_STATUS, sizeof(status), &status); |
| 123 | return 0; |
| 124 | |
| 125 | nfattr_failure: |
| 126 | return -1; |
| 127 | } |
| 128 | |
| 129 | static inline int |
| 130 | ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) |
| 131 | { |
| 132 | long timeout_l = ct->timeout.expires - jiffies; |
| 133 | u_int32_t timeout; |
| 134 | |
| 135 | if (timeout_l < 0) |
| 136 | timeout = 0; |
| 137 | else |
| 138 | timeout = htonl(timeout_l / HZ); |
| 139 | |
| 140 | NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout); |
| 141 | return 0; |
| 142 | |
| 143 | nfattr_failure: |
| 144 | return -1; |
| 145 | } |
| 146 | |
| 147 | static inline int |
| 148 | ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct) |
| 149 | { |
| 150 | struct nf_conntrack_protocol *proto = nf_ct_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
| 151 | struct nfattr *nest_proto; |
| 152 | int ret; |
| 153 | |
| 154 | if (!proto->to_nfattr) { |
| 155 | nf_ct_proto_put(proto); |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | nest_proto = NFA_NEST(skb, CTA_PROTOINFO); |
| 160 | |
| 161 | ret = proto->to_nfattr(skb, nest_proto, ct); |
| 162 | |
| 163 | nf_ct_proto_put(proto); |
| 164 | |
| 165 | NFA_NEST_END(skb, nest_proto); |
| 166 | |
| 167 | return ret; |
| 168 | |
| 169 | nfattr_failure: |
| 170 | return -1; |
| 171 | } |
| 172 | |
| 173 | static inline int |
| 174 | ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct) |
| 175 | { |
| 176 | struct nfattr *nest_helper; |
| 177 | const struct nf_conn_help *help = nfct_help(ct); |
| 178 | |
| 179 | if (!help || !help->helper) |
| 180 | return 0; |
| 181 | |
| 182 | nest_helper = NFA_NEST(skb, CTA_HELP); |
| 183 | NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name); |
| 184 | |
| 185 | if (help->helper->to_nfattr) |
| 186 | help->helper->to_nfattr(skb, ct); |
| 187 | |
| 188 | NFA_NEST_END(skb, nest_helper); |
| 189 | |
| 190 | return 0; |
| 191 | |
| 192 | nfattr_failure: |
| 193 | return -1; |
| 194 | } |
| 195 | |
| 196 | #ifdef CONFIG_NF_CT_ACCT |
| 197 | static inline int |
| 198 | ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct, |
| 199 | enum ip_conntrack_dir dir) |
| 200 | { |
| 201 | enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; |
| 202 | struct nfattr *nest_count = NFA_NEST(skb, type); |
| 203 | u_int32_t tmp; |
| 204 | |
| 205 | tmp = htonl(ct->counters[dir].packets); |
| 206 | NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp); |
| 207 | |
| 208 | tmp = htonl(ct->counters[dir].bytes); |
| 209 | NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp); |
| 210 | |
| 211 | NFA_NEST_END(skb, nest_count); |
| 212 | |
| 213 | return 0; |
| 214 | |
| 215 | nfattr_failure: |
| 216 | return -1; |
| 217 | } |
| 218 | #else |
| 219 | #define ctnetlink_dump_counters(a, b, c) (0) |
| 220 | #endif |
| 221 | |
| 222 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 223 | static inline int |
| 224 | ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) |
| 225 | { |
| 226 | u_int32_t mark = htonl(ct->mark); |
| 227 | |
| 228 | NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark); |
| 229 | return 0; |
| 230 | |
| 231 | nfattr_failure: |
| 232 | return -1; |
| 233 | } |
| 234 | #else |
| 235 | #define ctnetlink_dump_mark(a, b) (0) |
| 236 | #endif |
| 237 | |
| 238 | static inline int |
| 239 | ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) |
| 240 | { |
| 241 | u_int32_t id = htonl(ct->id); |
| 242 | NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id); |
| 243 | return 0; |
| 244 | |
| 245 | nfattr_failure: |
| 246 | return -1; |
| 247 | } |
| 248 | |
| 249 | static inline int |
| 250 | ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) |
| 251 | { |
| 252 | u_int32_t use = htonl(atomic_read(&ct->ct_general.use)); |
| 253 | |
| 254 | NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use); |
| 255 | return 0; |
| 256 | |
| 257 | nfattr_failure: |
| 258 | return -1; |
| 259 | } |
| 260 | |
| 261 | #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) |
| 262 | |
| 263 | static int |
| 264 | ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| 265 | int event, int nowait, |
| 266 | const struct nf_conn *ct) |
| 267 | { |
| 268 | struct nlmsghdr *nlh; |
| 269 | struct nfgenmsg *nfmsg; |
| 270 | struct nfattr *nest_parms; |
| 271 | unsigned char *b; |
| 272 | |
| 273 | b = skb->tail; |
| 274 | |
| 275 | event |= NFNL_SUBSYS_CTNETLINK << 8; |
| 276 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| 277 | nfmsg = NLMSG_DATA(nlh); |
| 278 | |
| 279 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
| 280 | nfmsg->nfgen_family = |
| 281 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 282 | nfmsg->version = NFNETLINK_V0; |
| 283 | nfmsg->res_id = 0; |
| 284 | |
| 285 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); |
| 286 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| 287 | goto nfattr_failure; |
| 288 | NFA_NEST_END(skb, nest_parms); |
| 289 | |
| 290 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
| 291 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| 292 | goto nfattr_failure; |
| 293 | NFA_NEST_END(skb, nest_parms); |
| 294 | |
| 295 | if (ctnetlink_dump_status(skb, ct) < 0 || |
| 296 | ctnetlink_dump_timeout(skb, ct) < 0 || |
| 297 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| 298 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 || |
| 299 | ctnetlink_dump_protoinfo(skb, ct) < 0 || |
| 300 | ctnetlink_dump_helpinfo(skb, ct) < 0 || |
| 301 | ctnetlink_dump_mark(skb, ct) < 0 || |
| 302 | ctnetlink_dump_id(skb, ct) < 0 || |
| 303 | ctnetlink_dump_use(skb, ct) < 0) |
| 304 | goto nfattr_failure; |
| 305 | |
| 306 | nlh->nlmsg_len = skb->tail - b; |
| 307 | return skb->len; |
| 308 | |
| 309 | nlmsg_failure: |
| 310 | nfattr_failure: |
| 311 | skb_trim(skb, b - skb->data); |
| 312 | return -1; |
| 313 | } |
| 314 | |
| 315 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 316 | static int ctnetlink_conntrack_event(struct notifier_block *this, |
| 317 | unsigned long events, void *ptr) |
| 318 | { |
| 319 | struct nlmsghdr *nlh; |
| 320 | struct nfgenmsg *nfmsg; |
| 321 | struct nfattr *nest_parms; |
| 322 | struct nf_conn *ct = (struct nf_conn *)ptr; |
| 323 | struct sk_buff *skb; |
| 324 | unsigned int type; |
| 325 | unsigned char *b; |
| 326 | unsigned int flags = 0, group; |
| 327 | |
| 328 | /* ignore our fake conntrack entry */ |
| 329 | if (ct == &nf_conntrack_untracked) |
| 330 | return NOTIFY_DONE; |
| 331 | |
| 332 | if (events & IPCT_DESTROY) { |
| 333 | type = IPCTNL_MSG_CT_DELETE; |
| 334 | group = NFNLGRP_CONNTRACK_DESTROY; |
| 335 | } else if (events & (IPCT_NEW | IPCT_RELATED)) { |
| 336 | type = IPCTNL_MSG_CT_NEW; |
| 337 | flags = NLM_F_CREATE|NLM_F_EXCL; |
| 338 | /* dump everything */ |
| 339 | events = ~0UL; |
| 340 | group = NFNLGRP_CONNTRACK_NEW; |
| 341 | } else if (events & (IPCT_STATUS | |
| 342 | IPCT_PROTOINFO | |
| 343 | IPCT_HELPER | |
| 344 | IPCT_HELPINFO | |
| 345 | IPCT_NATINFO)) { |
| 346 | type = IPCTNL_MSG_CT_NEW; |
| 347 | group = NFNLGRP_CONNTRACK_UPDATE; |
| 348 | } else |
| 349 | return NOTIFY_DONE; |
| 350 | |
| 351 | if (!nfnetlink_has_listeners(group)) |
| 352 | return NOTIFY_DONE; |
| 353 | |
| 354 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 355 | if (!skb) |
| 356 | return NOTIFY_DONE; |
| 357 | |
| 358 | b = skb->tail; |
| 359 | |
| 360 | type |= NFNL_SUBSYS_CTNETLINK << 8; |
| 361 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| 362 | nfmsg = NLMSG_DATA(nlh); |
| 363 | |
| 364 | nlh->nlmsg_flags = flags; |
| 365 | nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 366 | nfmsg->version = NFNETLINK_V0; |
| 367 | nfmsg->res_id = 0; |
| 368 | |
| 369 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); |
| 370 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| 371 | goto nfattr_failure; |
| 372 | NFA_NEST_END(skb, nest_parms); |
| 373 | |
| 374 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
| 375 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| 376 | goto nfattr_failure; |
| 377 | NFA_NEST_END(skb, nest_parms); |
| 378 | |
| 379 | /* NAT stuff is now a status flag */ |
| 380 | if ((events & IPCT_STATUS || events & IPCT_NATINFO) |
| 381 | && ctnetlink_dump_status(skb, ct) < 0) |
| 382 | goto nfattr_failure; |
| 383 | if (events & IPCT_REFRESH |
| 384 | && ctnetlink_dump_timeout(skb, ct) < 0) |
| 385 | goto nfattr_failure; |
| 386 | if (events & IPCT_PROTOINFO |
| 387 | && ctnetlink_dump_protoinfo(skb, ct) < 0) |
| 388 | goto nfattr_failure; |
| 389 | if (events & IPCT_HELPINFO |
| 390 | && ctnetlink_dump_helpinfo(skb, ct) < 0) |
| 391 | goto nfattr_failure; |
| 392 | |
| 393 | if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| 394 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) |
| 395 | goto nfattr_failure; |
| 396 | |
| 397 | nlh->nlmsg_len = skb->tail - b; |
| 398 | nfnetlink_send(skb, 0, group, 0); |
| 399 | return NOTIFY_DONE; |
| 400 | |
| 401 | nlmsg_failure: |
| 402 | nfattr_failure: |
| 403 | kfree_skb(skb); |
| 404 | return NOTIFY_DONE; |
| 405 | } |
| 406 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ |
| 407 | |
| 408 | static int ctnetlink_done(struct netlink_callback *cb) |
| 409 | { |
| 410 | DEBUGP("entered %s\n", __FUNCTION__); |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num |
| 415 | |
| 416 | static int |
| 417 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| 418 | { |
| 419 | struct nf_conn *ct = NULL; |
| 420 | struct nf_conntrack_tuple_hash *h; |
| 421 | struct list_head *i; |
| 422 | u_int32_t *id = (u_int32_t *) &cb->args[1]; |
| 423 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 424 | u_int8_t l3proto = nfmsg->nfgen_family; |
| 425 | |
| 426 | DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__, |
| 427 | cb->args[0], *id); |
| 428 | |
| 429 | read_lock_bh(&nf_conntrack_lock); |
| 430 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) { |
| 431 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
| 432 | h = (struct nf_conntrack_tuple_hash *) i; |
| 433 | if (DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 434 | continue; |
| 435 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 436 | /* Dump entries of a given L3 protocol number. |
| 437 | * If it is not specified, ie. l3proto == 0, |
| 438 | * then dump everything. */ |
| 439 | if (l3proto && L3PROTO(ct) != l3proto) |
| 440 | continue; |
| 441 | if (ct->id <= *id) |
| 442 | continue; |
| 443 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| 444 | cb->nlh->nlmsg_seq, |
| 445 | IPCTNL_MSG_CT_NEW, |
| 446 | 1, ct) < 0) |
| 447 | goto out; |
| 448 | *id = ct->id; |
| 449 | } |
| 450 | } |
| 451 | out: |
| 452 | read_unlock_bh(&nf_conntrack_lock); |
| 453 | |
| 454 | DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id); |
| 455 | |
| 456 | return skb->len; |
| 457 | } |
| 458 | |
| 459 | #ifdef CONFIG_NF_CT_ACCT |
| 460 | static int |
| 461 | ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb) |
| 462 | { |
| 463 | struct nf_conn *ct = NULL; |
| 464 | struct nf_conntrack_tuple_hash *h; |
| 465 | struct list_head *i; |
| 466 | u_int32_t *id = (u_int32_t *) &cb->args[1]; |
| 467 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 468 | u_int8_t l3proto = nfmsg->nfgen_family; |
| 469 | |
| 470 | DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__, |
| 471 | cb->args[0], *id); |
| 472 | |
| 473 | write_lock_bh(&nf_conntrack_lock); |
| 474 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) { |
| 475 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
| 476 | h = (struct nf_conntrack_tuple_hash *) i; |
| 477 | if (DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 478 | continue; |
| 479 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 480 | if (l3proto && L3PROTO(ct) != l3proto) |
| 481 | continue; |
| 482 | if (ct->id <= *id) |
| 483 | continue; |
| 484 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| 485 | cb->nlh->nlmsg_seq, |
| 486 | IPCTNL_MSG_CT_NEW, |
| 487 | 1, ct) < 0) |
| 488 | goto out; |
| 489 | *id = ct->id; |
| 490 | |
| 491 | memset(&ct->counters, 0, sizeof(ct->counters)); |
| 492 | } |
| 493 | } |
| 494 | out: |
| 495 | write_unlock_bh(&nf_conntrack_lock); |
| 496 | |
| 497 | DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id); |
| 498 | |
| 499 | return skb->len; |
| 500 | } |
| 501 | #endif |
| 502 | |
| 503 | static inline int |
| 504 | ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple) |
| 505 | { |
| 506 | struct nfattr *tb[CTA_IP_MAX]; |
| 507 | struct nf_conntrack_l3proto *l3proto; |
| 508 | int ret = 0; |
| 509 | |
| 510 | DEBUGP("entered %s\n", __FUNCTION__); |
| 511 | |
| 512 | nfattr_parse_nested(tb, CTA_IP_MAX, attr); |
| 513 | |
| 514 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 515 | |
| 516 | if (likely(l3proto->nfattr_to_tuple)) |
| 517 | ret = l3proto->nfattr_to_tuple(tb, tuple); |
| 518 | |
| 519 | nf_ct_l3proto_put(l3proto); |
| 520 | |
| 521 | DEBUGP("leaving\n"); |
| 522 | |
| 523 | return ret; |
| 524 | } |
| 525 | |
| 526 | static const size_t cta_min_proto[CTA_PROTO_MAX] = { |
| 527 | [CTA_PROTO_NUM-1] = sizeof(u_int8_t), |
| 528 | }; |
| 529 | |
| 530 | static inline int |
| 531 | ctnetlink_parse_tuple_proto(struct nfattr *attr, |
| 532 | struct nf_conntrack_tuple *tuple) |
| 533 | { |
| 534 | struct nfattr *tb[CTA_PROTO_MAX]; |
| 535 | struct nf_conntrack_protocol *proto; |
| 536 | int ret = 0; |
| 537 | |
| 538 | DEBUGP("entered %s\n", __FUNCTION__); |
| 539 | |
| 540 | nfattr_parse_nested(tb, CTA_PROTO_MAX, attr); |
| 541 | |
| 542 | if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto)) |
| 543 | return -EINVAL; |
| 544 | |
| 545 | if (!tb[CTA_PROTO_NUM-1]) |
| 546 | return -EINVAL; |
| 547 | tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]); |
| 548 | |
| 549 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| 550 | |
| 551 | if (likely(proto->nfattr_to_tuple)) |
| 552 | ret = proto->nfattr_to_tuple(tb, tuple); |
| 553 | |
| 554 | nf_ct_proto_put(proto); |
| 555 | |
| 556 | return ret; |
| 557 | } |
| 558 | |
| 559 | static inline int |
| 560 | ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple, |
| 561 | enum ctattr_tuple type, u_int8_t l3num) |
| 562 | { |
| 563 | struct nfattr *tb[CTA_TUPLE_MAX]; |
| 564 | int err; |
| 565 | |
| 566 | DEBUGP("entered %s\n", __FUNCTION__); |
| 567 | |
| 568 | memset(tuple, 0, sizeof(*tuple)); |
| 569 | |
| 570 | nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]); |
| 571 | |
| 572 | if (!tb[CTA_TUPLE_IP-1]) |
| 573 | return -EINVAL; |
| 574 | |
| 575 | tuple->src.l3num = l3num; |
| 576 | |
| 577 | err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple); |
| 578 | if (err < 0) |
| 579 | return err; |
| 580 | |
| 581 | if (!tb[CTA_TUPLE_PROTO-1]) |
| 582 | return -EINVAL; |
| 583 | |
| 584 | err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple); |
| 585 | if (err < 0) |
| 586 | return err; |
| 587 | |
| 588 | /* orig and expect tuples get DIR_ORIGINAL */ |
| 589 | if (type == CTA_TUPLE_REPLY) |
| 590 | tuple->dst.dir = IP_CT_DIR_REPLY; |
| 591 | else |
| 592 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 593 | |
| 594 | NF_CT_DUMP_TUPLE(tuple); |
| 595 | |
| 596 | DEBUGP("leaving\n"); |
| 597 | |
| 598 | return 0; |
| 599 | } |
| 600 | |
| 601 | #ifdef CONFIG_IP_NF_NAT_NEEDED |
| 602 | static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = { |
| 603 | [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t), |
| 604 | [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t), |
| 605 | }; |
| 606 | |
| 607 | static int ctnetlink_parse_nat_proto(struct nfattr *attr, |
| 608 | const struct nf_conn *ct, |
| 609 | struct ip_nat_range *range) |
| 610 | { |
| 611 | struct nfattr *tb[CTA_PROTONAT_MAX]; |
| 612 | struct ip_nat_protocol *npt; |
| 613 | |
| 614 | DEBUGP("entered %s\n", __FUNCTION__); |
| 615 | |
| 616 | nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr); |
| 617 | |
| 618 | if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat)) |
| 619 | return -EINVAL; |
| 620 | |
| 621 | npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
| 622 | |
| 623 | if (!npt->nfattr_to_range) { |
| 624 | ip_nat_proto_put(npt); |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */ |
| 629 | if (npt->nfattr_to_range(tb, range) > 0) |
| 630 | range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED; |
| 631 | |
| 632 | ip_nat_proto_put(npt); |
| 633 | |
| 634 | DEBUGP("leaving\n"); |
| 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | static const size_t cta_min_nat[CTA_NAT_MAX] = { |
| 639 | [CTA_NAT_MINIP-1] = sizeof(u_int32_t), |
| 640 | [CTA_NAT_MAXIP-1] = sizeof(u_int32_t), |
| 641 | }; |
| 642 | |
| 643 | static inline int |
| 644 | ctnetlink_parse_nat(struct nfattr *nat, |
| 645 | const struct nf_conn *ct, struct ip_nat_range *range) |
| 646 | { |
| 647 | struct nfattr *tb[CTA_NAT_MAX]; |
| 648 | int err; |
| 649 | |
| 650 | DEBUGP("entered %s\n", __FUNCTION__); |
| 651 | |
| 652 | memset(range, 0, sizeof(*range)); |
| 653 | |
| 654 | nfattr_parse_nested(tb, CTA_NAT_MAX, nat); |
| 655 | |
| 656 | if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat)) |
| 657 | return -EINVAL; |
| 658 | |
| 659 | if (tb[CTA_NAT_MINIP-1]) |
| 660 | range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]); |
| 661 | |
| 662 | if (!tb[CTA_NAT_MAXIP-1]) |
| 663 | range->max_ip = range->min_ip; |
| 664 | else |
| 665 | range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]); |
| 666 | |
| 667 | if (range->min_ip) |
| 668 | range->flags |= IP_NAT_RANGE_MAP_IPS; |
| 669 | |
| 670 | if (!tb[CTA_NAT_PROTO-1]) |
| 671 | return 0; |
| 672 | |
| 673 | err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range); |
| 674 | if (err < 0) |
| 675 | return err; |
| 676 | |
| 677 | DEBUGP("leaving\n"); |
| 678 | return 0; |
| 679 | } |
| 680 | #endif |
| 681 | |
| 682 | static inline int |
| 683 | ctnetlink_parse_help(struct nfattr *attr, char **helper_name) |
| 684 | { |
| 685 | struct nfattr *tb[CTA_HELP_MAX]; |
| 686 | |
| 687 | DEBUGP("entered %s\n", __FUNCTION__); |
| 688 | |
| 689 | nfattr_parse_nested(tb, CTA_HELP_MAX, attr); |
| 690 | |
| 691 | if (!tb[CTA_HELP_NAME-1]) |
| 692 | return -EINVAL; |
| 693 | |
| 694 | *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]); |
| 695 | |
| 696 | return 0; |
| 697 | } |
| 698 | |
| 699 | static const size_t cta_min[CTA_MAX] = { |
| 700 | [CTA_STATUS-1] = sizeof(u_int32_t), |
| 701 | [CTA_TIMEOUT-1] = sizeof(u_int32_t), |
| 702 | [CTA_MARK-1] = sizeof(u_int32_t), |
| 703 | [CTA_USE-1] = sizeof(u_int32_t), |
| 704 | [CTA_ID-1] = sizeof(u_int32_t) |
| 705 | }; |
| 706 | |
| 707 | static int |
| 708 | ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| 709 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 710 | { |
| 711 | struct nf_conntrack_tuple_hash *h; |
| 712 | struct nf_conntrack_tuple tuple; |
| 713 | struct nf_conn *ct; |
| 714 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 715 | u_int8_t u3 = nfmsg->nfgen_family; |
| 716 | int err = 0; |
| 717 | |
| 718 | DEBUGP("entered %s\n", __FUNCTION__); |
| 719 | |
| 720 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 721 | return -EINVAL; |
| 722 | |
| 723 | if (cda[CTA_TUPLE_ORIG-1]) |
| 724 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| 725 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 726 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| 727 | else { |
| 728 | /* Flush the whole table */ |
| 729 | nf_conntrack_flush(); |
| 730 | return 0; |
| 731 | } |
| 732 | |
| 733 | if (err < 0) |
| 734 | return err; |
| 735 | |
| 736 | h = nf_conntrack_find_get(&tuple, NULL); |
| 737 | if (!h) { |
| 738 | DEBUGP("tuple not found in conntrack hash\n"); |
| 739 | return -ENOENT; |
| 740 | } |
| 741 | |
| 742 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 743 | |
| 744 | if (cda[CTA_ID-1]) { |
| 745 | u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1])); |
| 746 | if (ct->id != id) { |
| 747 | nf_ct_put(ct); |
| 748 | return -ENOENT; |
| 749 | } |
| 750 | } |
| 751 | if (del_timer(&ct->timeout)) |
| 752 | ct->timeout.function((unsigned long)ct); |
| 753 | |
| 754 | nf_ct_put(ct); |
| 755 | DEBUGP("leaving\n"); |
| 756 | |
| 757 | return 0; |
| 758 | } |
| 759 | |
| 760 | static int |
| 761 | ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| 762 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 763 | { |
| 764 | struct nf_conntrack_tuple_hash *h; |
| 765 | struct nf_conntrack_tuple tuple; |
| 766 | struct nf_conn *ct; |
| 767 | struct sk_buff *skb2 = NULL; |
| 768 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 769 | u_int8_t u3 = nfmsg->nfgen_family; |
| 770 | int err = 0; |
| 771 | |
| 772 | DEBUGP("entered %s\n", __FUNCTION__); |
| 773 | |
| 774 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 775 | u32 rlen; |
| 776 | |
| 777 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == |
| 778 | IPCTNL_MSG_CT_GET_CTRZERO) { |
| 779 | #ifdef CONFIG_NF_CT_ACCT |
| 780 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
| 781 | ctnetlink_dump_table_w, |
| 782 | ctnetlink_done)) != 0) |
| 783 | return -EINVAL; |
| 784 | #else |
| 785 | return -ENOTSUPP; |
| 786 | #endif |
| 787 | } else { |
| 788 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
| 789 | ctnetlink_dump_table, |
| 790 | ctnetlink_done)) != 0) |
| 791 | return -EINVAL; |
| 792 | } |
| 793 | |
| 794 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| 795 | if (rlen > skb->len) |
| 796 | rlen = skb->len; |
| 797 | skb_pull(skb, rlen); |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 802 | return -EINVAL; |
| 803 | |
| 804 | if (cda[CTA_TUPLE_ORIG-1]) |
| 805 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| 806 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 807 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| 808 | else |
| 809 | return -EINVAL; |
| 810 | |
| 811 | if (err < 0) |
| 812 | return err; |
| 813 | |
| 814 | h = nf_conntrack_find_get(&tuple, NULL); |
| 815 | if (!h) { |
| 816 | DEBUGP("tuple not found in conntrack hash"); |
| 817 | return -ENOENT; |
| 818 | } |
| 819 | DEBUGP("tuple found\n"); |
| 820 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 821 | |
| 822 | err = -ENOMEM; |
| 823 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 824 | if (!skb2) { |
| 825 | nf_ct_put(ct); |
| 826 | return -ENOMEM; |
| 827 | } |
| 828 | NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid; |
| 829 | |
| 830 | err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, |
| 831 | IPCTNL_MSG_CT_NEW, 1, ct); |
| 832 | nf_ct_put(ct); |
| 833 | if (err <= 0) |
| 834 | goto free; |
| 835 | |
| 836 | err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 837 | if (err < 0) |
| 838 | goto out; |
| 839 | |
| 840 | DEBUGP("leaving\n"); |
| 841 | return 0; |
| 842 | |
| 843 | free: |
| 844 | kfree_skb(skb2); |
| 845 | out: |
| 846 | return err; |
| 847 | } |
| 848 | |
| 849 | static inline int |
| 850 | ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[]) |
| 851 | { |
| 852 | unsigned long d; |
| 853 | unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1])); |
| 854 | d = ct->status ^ status; |
| 855 | |
| 856 | if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING)) |
| 857 | /* unchangeable */ |
| 858 | return -EINVAL; |
| 859 | |
| 860 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) |
| 861 | /* SEEN_REPLY bit can only be set */ |
| 862 | return -EINVAL; |
| 863 | |
| 864 | |
| 865 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) |
| 866 | /* ASSURED bit can only be set */ |
| 867 | return -EINVAL; |
| 868 | |
| 869 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
| 870 | #ifndef CONFIG_IP_NF_NAT_NEEDED |
| 871 | return -EINVAL; |
| 872 | #else |
| 873 | struct ip_nat_range range; |
| 874 | |
| 875 | if (cda[CTA_NAT_DST-1]) { |
| 876 | if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct, |
| 877 | &range) < 0) |
| 878 | return -EINVAL; |
| 879 | if (ip_nat_initialized(ct, |
| 880 | HOOK2MANIP(NF_IP_PRE_ROUTING))) |
| 881 | return -EEXIST; |
| 882 | ip_nat_setup_info(ct, &range, hooknum); |
| 883 | } |
| 884 | if (cda[CTA_NAT_SRC-1]) { |
| 885 | if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct, |
| 886 | &range) < 0) |
| 887 | return -EINVAL; |
| 888 | if (ip_nat_initialized(ct, |
| 889 | HOOK2MANIP(NF_IP_POST_ROUTING))) |
| 890 | return -EEXIST; |
| 891 | ip_nat_setup_info(ct, &range, hooknum); |
| 892 | } |
| 893 | #endif |
| 894 | } |
| 895 | |
| 896 | /* Be careful here, modifying NAT bits can screw up things, |
| 897 | * so don't let users modify them directly if they don't pass |
| 898 | * ip_nat_range. */ |
| 899 | ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | |
| 904 | static inline int |
| 905 | ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[]) |
| 906 | { |
| 907 | struct nf_conntrack_helper *helper; |
| 908 | struct nf_conn_help *help = nfct_help(ct); |
| 909 | char *helpname; |
| 910 | int err; |
| 911 | |
| 912 | DEBUGP("entered %s\n", __FUNCTION__); |
| 913 | |
| 914 | if (!help) { |
| 915 | /* FIXME: we need to reallocate and rehash */ |
| 916 | return -EBUSY; |
| 917 | } |
| 918 | |
| 919 | /* don't change helper of sibling connections */ |
| 920 | if (ct->master) |
| 921 | return -EINVAL; |
| 922 | |
| 923 | err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname); |
| 924 | if (err < 0) |
| 925 | return err; |
| 926 | |
| 927 | helper = __nf_conntrack_helper_find_byname(helpname); |
| 928 | if (!helper) { |
| 929 | if (!strcmp(helpname, "")) |
| 930 | helper = NULL; |
| 931 | else |
| 932 | return -EINVAL; |
| 933 | } |
| 934 | |
| 935 | if (help->helper) { |
| 936 | if (!helper) { |
| 937 | /* we had a helper before ... */ |
| 938 | nf_ct_remove_expectations(ct); |
| 939 | help->helper = NULL; |
| 940 | } else { |
| 941 | /* need to zero data of old helper */ |
| 942 | memset(&help->help, 0, sizeof(help->help)); |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | help->helper = helper; |
| 947 | |
| 948 | return 0; |
| 949 | } |
| 950 | |
| 951 | static inline int |
| 952 | ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[]) |
| 953 | { |
| 954 | u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
| 955 | |
| 956 | if (!del_timer(&ct->timeout)) |
| 957 | return -ETIME; |
| 958 | |
| 959 | ct->timeout.expires = jiffies + timeout * HZ; |
| 960 | add_timer(&ct->timeout); |
| 961 | |
| 962 | return 0; |
| 963 | } |
| 964 | |
| 965 | static inline int |
| 966 | ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[]) |
| 967 | { |
| 968 | struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1]; |
| 969 | struct nf_conntrack_protocol *proto; |
| 970 | u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; |
| 971 | u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 972 | int err = 0; |
| 973 | |
| 974 | nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr); |
| 975 | |
| 976 | proto = nf_ct_proto_find_get(l3num, npt); |
| 977 | |
| 978 | if (proto->from_nfattr) |
| 979 | err = proto->from_nfattr(tb, ct); |
| 980 | nf_ct_proto_put(proto); |
| 981 | |
| 982 | return err; |
| 983 | } |
| 984 | |
| 985 | static int |
| 986 | ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[]) |
| 987 | { |
| 988 | int err; |
| 989 | |
| 990 | DEBUGP("entered %s\n", __FUNCTION__); |
| 991 | |
| 992 | if (cda[CTA_HELP-1]) { |
| 993 | err = ctnetlink_change_helper(ct, cda); |
| 994 | if (err < 0) |
| 995 | return err; |
| 996 | } |
| 997 | |
| 998 | if (cda[CTA_TIMEOUT-1]) { |
| 999 | err = ctnetlink_change_timeout(ct, cda); |
| 1000 | if (err < 0) |
| 1001 | return err; |
| 1002 | } |
| 1003 | |
| 1004 | if (cda[CTA_STATUS-1]) { |
| 1005 | err = ctnetlink_change_status(ct, cda); |
| 1006 | if (err < 0) |
| 1007 | return err; |
| 1008 | } |
| 1009 | |
| 1010 | if (cda[CTA_PROTOINFO-1]) { |
| 1011 | err = ctnetlink_change_protoinfo(ct, cda); |
| 1012 | if (err < 0) |
| 1013 | return err; |
| 1014 | } |
| 1015 | |
| 1016 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
| 1017 | if (cda[CTA_MARK-1]) |
| 1018 | ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); |
| 1019 | #endif |
| 1020 | |
| 1021 | DEBUGP("all done\n"); |
| 1022 | return 0; |
| 1023 | } |
| 1024 | |
| 1025 | static int |
| 1026 | ctnetlink_create_conntrack(struct nfattr *cda[], |
| 1027 | struct nf_conntrack_tuple *otuple, |
| 1028 | struct nf_conntrack_tuple *rtuple) |
| 1029 | { |
| 1030 | struct nf_conn *ct; |
| 1031 | int err = -EINVAL; |
| 1032 | |
| 1033 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1034 | |
| 1035 | ct = nf_conntrack_alloc(otuple, rtuple); |
| 1036 | if (ct == NULL || IS_ERR(ct)) |
| 1037 | return -ENOMEM; |
| 1038 | |
| 1039 | if (!cda[CTA_TIMEOUT-1]) |
| 1040 | goto err; |
| 1041 | ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
| 1042 | |
| 1043 | ct->timeout.expires = jiffies + ct->timeout.expires * HZ; |
| 1044 | ct->status |= IPS_CONFIRMED; |
| 1045 | |
| 1046 | err = ctnetlink_change_status(ct, cda); |
| 1047 | if (err < 0) |
| 1048 | goto err; |
| 1049 | |
| 1050 | if (cda[CTA_PROTOINFO-1]) { |
| 1051 | err = ctnetlink_change_protoinfo(ct, cda); |
| 1052 | if (err < 0) |
| 1053 | return err; |
| 1054 | } |
| 1055 | |
| 1056 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
| 1057 | if (cda[CTA_MARK-1]) |
| 1058 | ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); |
| 1059 | #endif |
| 1060 | |
| 1061 | add_timer(&ct->timeout); |
| 1062 | nf_conntrack_hash_insert(ct); |
| 1063 | |
| 1064 | DEBUGP("conntrack with id %u inserted\n", ct->id); |
| 1065 | return 0; |
| 1066 | |
| 1067 | err: |
| 1068 | nf_conntrack_free(ct); |
| 1069 | return err; |
| 1070 | } |
| 1071 | |
| 1072 | static int |
| 1073 | ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| 1074 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1075 | { |
| 1076 | struct nf_conntrack_tuple otuple, rtuple; |
| 1077 | struct nf_conntrack_tuple_hash *h = NULL; |
| 1078 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1079 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1080 | int err = 0; |
| 1081 | |
| 1082 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1083 | |
| 1084 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 1085 | return -EINVAL; |
| 1086 | |
| 1087 | if (cda[CTA_TUPLE_ORIG-1]) { |
| 1088 | err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); |
| 1089 | if (err < 0) |
| 1090 | return err; |
| 1091 | } |
| 1092 | |
| 1093 | if (cda[CTA_TUPLE_REPLY-1]) { |
| 1094 | err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); |
| 1095 | if (err < 0) |
| 1096 | return err; |
| 1097 | } |
| 1098 | |
| 1099 | write_lock_bh(&nf_conntrack_lock); |
| 1100 | if (cda[CTA_TUPLE_ORIG-1]) |
| 1101 | h = __nf_conntrack_find(&otuple, NULL); |
| 1102 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 1103 | h = __nf_conntrack_find(&rtuple, NULL); |
| 1104 | |
| 1105 | if (h == NULL) { |
| 1106 | write_unlock_bh(&nf_conntrack_lock); |
| 1107 | DEBUGP("no such conntrack, create new\n"); |
| 1108 | err = -ENOENT; |
| 1109 | if (nlh->nlmsg_flags & NLM_F_CREATE) |
| 1110 | err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); |
| 1111 | return err; |
| 1112 | } |
| 1113 | /* implicit 'else' */ |
| 1114 | |
| 1115 | /* we only allow nat config for new conntracks */ |
| 1116 | if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { |
| 1117 | err = -EINVAL; |
| 1118 | goto out_unlock; |
| 1119 | } |
| 1120 | |
| 1121 | /* We manipulate the conntrack inside the global conntrack table lock, |
| 1122 | * so there's no need to increase the refcount */ |
| 1123 | DEBUGP("conntrack found\n"); |
| 1124 | err = -EEXIST; |
| 1125 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
| 1126 | err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda); |
| 1127 | |
| 1128 | out_unlock: |
| 1129 | write_unlock_bh(&nf_conntrack_lock); |
| 1130 | return err; |
| 1131 | } |
| 1132 | |
| 1133 | /*********************************************************************** |
| 1134 | * EXPECT |
| 1135 | ***********************************************************************/ |
| 1136 | |
| 1137 | static inline int |
| 1138 | ctnetlink_exp_dump_tuple(struct sk_buff *skb, |
| 1139 | const struct nf_conntrack_tuple *tuple, |
| 1140 | enum ctattr_expect type) |
| 1141 | { |
| 1142 | struct nfattr *nest_parms = NFA_NEST(skb, type); |
| 1143 | |
| 1144 | if (ctnetlink_dump_tuples(skb, tuple) < 0) |
| 1145 | goto nfattr_failure; |
| 1146 | |
| 1147 | NFA_NEST_END(skb, nest_parms); |
| 1148 | |
| 1149 | return 0; |
| 1150 | |
| 1151 | nfattr_failure: |
| 1152 | return -1; |
| 1153 | } |
| 1154 | |
| 1155 | static inline int |
| 1156 | ctnetlink_exp_dump_mask(struct sk_buff *skb, |
| 1157 | const struct nf_conntrack_tuple *tuple, |
| 1158 | const struct nf_conntrack_tuple *mask) |
| 1159 | { |
| 1160 | int ret; |
| 1161 | struct nf_conntrack_l3proto *l3proto; |
| 1162 | struct nf_conntrack_protocol *proto; |
| 1163 | struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK); |
| 1164 | |
| 1165 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 1166 | ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto); |
| 1167 | nf_ct_l3proto_put(l3proto); |
| 1168 | |
| 1169 | if (unlikely(ret < 0)) |
| 1170 | goto nfattr_failure; |
| 1171 | |
| 1172 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| 1173 | ret = ctnetlink_dump_tuples_proto(skb, mask, proto); |
| 1174 | nf_ct_proto_put(proto); |
| 1175 | if (unlikely(ret < 0)) |
| 1176 | goto nfattr_failure; |
| 1177 | |
| 1178 | NFA_NEST_END(skb, nest_parms); |
| 1179 | |
| 1180 | return 0; |
| 1181 | |
| 1182 | nfattr_failure: |
| 1183 | return -1; |
| 1184 | } |
| 1185 | |
| 1186 | static inline int |
| 1187 | ctnetlink_exp_dump_expect(struct sk_buff *skb, |
| 1188 | const struct nf_conntrack_expect *exp) |
| 1189 | { |
| 1190 | struct nf_conn *master = exp->master; |
| 1191 | u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ); |
| 1192 | u_int32_t id = htonl(exp->id); |
| 1193 | |
| 1194 | if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0) |
| 1195 | goto nfattr_failure; |
| 1196 | if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0) |
| 1197 | goto nfattr_failure; |
| 1198 | if (ctnetlink_exp_dump_tuple(skb, |
| 1199 | &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 1200 | CTA_EXPECT_MASTER) < 0) |
| 1201 | goto nfattr_failure; |
| 1202 | |
| 1203 | NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout); |
| 1204 | NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id); |
| 1205 | |
| 1206 | return 0; |
| 1207 | |
| 1208 | nfattr_failure: |
| 1209 | return -1; |
| 1210 | } |
| 1211 | |
| 1212 | static int |
| 1213 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| 1214 | int event, |
| 1215 | int nowait, |
| 1216 | const struct nf_conntrack_expect *exp) |
| 1217 | { |
| 1218 | struct nlmsghdr *nlh; |
| 1219 | struct nfgenmsg *nfmsg; |
| 1220 | unsigned char *b; |
| 1221 | |
| 1222 | b = skb->tail; |
| 1223 | |
| 1224 | event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
| 1225 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| 1226 | nfmsg = NLMSG_DATA(nlh); |
| 1227 | |
| 1228 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
| 1229 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
| 1230 | nfmsg->version = NFNETLINK_V0; |
| 1231 | nfmsg->res_id = 0; |
| 1232 | |
| 1233 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
| 1234 | goto nfattr_failure; |
| 1235 | |
| 1236 | nlh->nlmsg_len = skb->tail - b; |
| 1237 | return skb->len; |
| 1238 | |
| 1239 | nlmsg_failure: |
| 1240 | nfattr_failure: |
| 1241 | skb_trim(skb, b - skb->data); |
| 1242 | return -1; |
| 1243 | } |
| 1244 | |
| 1245 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1246 | static int ctnetlink_expect_event(struct notifier_block *this, |
| 1247 | unsigned long events, void *ptr) |
| 1248 | { |
| 1249 | struct nlmsghdr *nlh; |
| 1250 | struct nfgenmsg *nfmsg; |
| 1251 | struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr; |
| 1252 | struct sk_buff *skb; |
| 1253 | unsigned int type; |
| 1254 | unsigned char *b; |
| 1255 | int flags = 0; |
| 1256 | |
| 1257 | if (events & IPEXP_NEW) { |
| 1258 | type = IPCTNL_MSG_EXP_NEW; |
| 1259 | flags = NLM_F_CREATE|NLM_F_EXCL; |
| 1260 | } else |
| 1261 | return NOTIFY_DONE; |
| 1262 | |
| 1263 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 1264 | if (!skb) |
| 1265 | return NOTIFY_DONE; |
| 1266 | |
| 1267 | b = skb->tail; |
| 1268 | |
| 1269 | type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
| 1270 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| 1271 | nfmsg = NLMSG_DATA(nlh); |
| 1272 | |
| 1273 | nlh->nlmsg_flags = flags; |
| 1274 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
| 1275 | nfmsg->version = NFNETLINK_V0; |
| 1276 | nfmsg->res_id = 0; |
| 1277 | |
| 1278 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
| 1279 | goto nfattr_failure; |
| 1280 | |
| 1281 | nlh->nlmsg_len = skb->tail - b; |
| 1282 | nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0); |
| 1283 | return NOTIFY_DONE; |
| 1284 | |
| 1285 | nlmsg_failure: |
| 1286 | nfattr_failure: |
| 1287 | kfree_skb(skb); |
| 1288 | return NOTIFY_DONE; |
| 1289 | } |
| 1290 | #endif |
| 1291 | |
| 1292 | static int |
| 1293 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| 1294 | { |
| 1295 | struct nf_conntrack_expect *exp = NULL; |
| 1296 | struct list_head *i; |
| 1297 | u_int32_t *id = (u_int32_t *) &cb->args[0]; |
| 1298 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 1299 | u_int8_t l3proto = nfmsg->nfgen_family; |
| 1300 | |
| 1301 | DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id); |
| 1302 | |
| 1303 | read_lock_bh(&nf_conntrack_lock); |
| 1304 | list_for_each_prev(i, &nf_conntrack_expect_list) { |
| 1305 | exp = (struct nf_conntrack_expect *) i; |
| 1306 | if (l3proto && exp->tuple.src.l3num != l3proto) |
| 1307 | continue; |
| 1308 | if (exp->id <= *id) |
| 1309 | continue; |
| 1310 | if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| 1311 | cb->nlh->nlmsg_seq, |
| 1312 | IPCTNL_MSG_EXP_NEW, |
| 1313 | 1, exp) < 0) |
| 1314 | goto out; |
| 1315 | *id = exp->id; |
| 1316 | } |
| 1317 | out: |
| 1318 | read_unlock_bh(&nf_conntrack_lock); |
| 1319 | |
| 1320 | DEBUGP("leaving, last id=%llu\n", *id); |
| 1321 | |
| 1322 | return skb->len; |
| 1323 | } |
| 1324 | |
| 1325 | static const size_t cta_min_exp[CTA_EXPECT_MAX] = { |
| 1326 | [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t), |
| 1327 | [CTA_EXPECT_ID-1] = sizeof(u_int32_t) |
| 1328 | }; |
| 1329 | |
| 1330 | static int |
| 1331 | ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, |
| 1332 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1333 | { |
| 1334 | struct nf_conntrack_tuple tuple; |
| 1335 | struct nf_conntrack_expect *exp; |
| 1336 | struct sk_buff *skb2; |
| 1337 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1338 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1339 | int err = 0; |
| 1340 | |
| 1341 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1342 | |
| 1343 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1344 | return -EINVAL; |
| 1345 | |
| 1346 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1347 | u32 rlen; |
| 1348 | |
| 1349 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
| 1350 | ctnetlink_exp_dump_table, |
| 1351 | ctnetlink_done)) != 0) |
| 1352 | return -EINVAL; |
| 1353 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| 1354 | if (rlen > skb->len) |
| 1355 | rlen = skb->len; |
| 1356 | skb_pull(skb, rlen); |
| 1357 | return 0; |
| 1358 | } |
| 1359 | |
| 1360 | if (cda[CTA_EXPECT_MASTER-1]) |
| 1361 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); |
| 1362 | else |
| 1363 | return -EINVAL; |
| 1364 | |
| 1365 | if (err < 0) |
| 1366 | return err; |
| 1367 | |
| 1368 | exp = nf_conntrack_expect_find(&tuple); |
| 1369 | if (!exp) |
| 1370 | return -ENOENT; |
| 1371 | |
| 1372 | if (cda[CTA_EXPECT_ID-1]) { |
| 1373 | u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
| 1374 | if (exp->id != ntohl(id)) { |
| 1375 | nf_conntrack_expect_put(exp); |
| 1376 | return -ENOENT; |
| 1377 | } |
| 1378 | } |
| 1379 | |
| 1380 | err = -ENOMEM; |
| 1381 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1382 | if (!skb2) |
| 1383 | goto out; |
| 1384 | NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid; |
| 1385 | |
| 1386 | err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, |
| 1387 | nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, |
| 1388 | 1, exp); |
| 1389 | if (err <= 0) |
| 1390 | goto free; |
| 1391 | |
| 1392 | nf_conntrack_expect_put(exp); |
| 1393 | |
| 1394 | return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1395 | |
| 1396 | free: |
| 1397 | kfree_skb(skb2); |
| 1398 | out: |
| 1399 | nf_conntrack_expect_put(exp); |
| 1400 | return err; |
| 1401 | } |
| 1402 | |
| 1403 | static int |
| 1404 | ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, |
| 1405 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1406 | { |
| 1407 | struct nf_conntrack_expect *exp, *tmp; |
| 1408 | struct nf_conntrack_tuple tuple; |
| 1409 | struct nf_conntrack_helper *h; |
| 1410 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1411 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1412 | int err; |
| 1413 | |
| 1414 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1415 | return -EINVAL; |
| 1416 | |
| 1417 | if (cda[CTA_EXPECT_TUPLE-1]) { |
| 1418 | /* delete a single expect by tuple */ |
| 1419 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1420 | if (err < 0) |
| 1421 | return err; |
| 1422 | |
| 1423 | /* bump usage count to 2 */ |
| 1424 | exp = nf_conntrack_expect_find(&tuple); |
| 1425 | if (!exp) |
| 1426 | return -ENOENT; |
| 1427 | |
| 1428 | if (cda[CTA_EXPECT_ID-1]) { |
| 1429 | u_int32_t id = |
| 1430 | *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
| 1431 | if (exp->id != ntohl(id)) { |
| 1432 | nf_conntrack_expect_put(exp); |
| 1433 | return -ENOENT; |
| 1434 | } |
| 1435 | } |
| 1436 | |
| 1437 | /* after list removal, usage count == 1 */ |
| 1438 | nf_conntrack_unexpect_related(exp); |
| 1439 | /* have to put what we 'get' above. |
| 1440 | * after this line usage count == 0 */ |
| 1441 | nf_conntrack_expect_put(exp); |
| 1442 | } else if (cda[CTA_EXPECT_HELP_NAME-1]) { |
| 1443 | char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]); |
| 1444 | |
| 1445 | /* delete all expectations for this helper */ |
| 1446 | write_lock_bh(&nf_conntrack_lock); |
| 1447 | h = __nf_conntrack_helper_find_byname(name); |
| 1448 | if (!h) { |
| 1449 | write_unlock_bh(&nf_conntrack_lock); |
| 1450 | return -EINVAL; |
| 1451 | } |
| 1452 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, |
| 1453 | list) { |
| 1454 | struct nf_conn_help *m_help = nfct_help(exp->master); |
| 1455 | if (m_help->helper == h |
| 1456 | && del_timer(&exp->timeout)) { |
| 1457 | nf_ct_unlink_expect(exp); |
| 1458 | nf_conntrack_expect_put(exp); |
| 1459 | } |
| 1460 | } |
| 1461 | write_unlock_bh(&nf_conntrack_lock); |
| 1462 | } else { |
| 1463 | /* This basically means we have to flush everything*/ |
| 1464 | write_lock_bh(&nf_conntrack_lock); |
| 1465 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, |
| 1466 | list) { |
| 1467 | if (del_timer(&exp->timeout)) { |
| 1468 | nf_ct_unlink_expect(exp); |
| 1469 | nf_conntrack_expect_put(exp); |
| 1470 | } |
| 1471 | } |
| 1472 | write_unlock_bh(&nf_conntrack_lock); |
| 1473 | } |
| 1474 | |
| 1475 | return 0; |
| 1476 | } |
| 1477 | static int |
| 1478 | ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[]) |
| 1479 | { |
| 1480 | return -EOPNOTSUPP; |
| 1481 | } |
| 1482 | |
| 1483 | static int |
| 1484 | ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3) |
| 1485 | { |
| 1486 | struct nf_conntrack_tuple tuple, mask, master_tuple; |
| 1487 | struct nf_conntrack_tuple_hash *h = NULL; |
| 1488 | struct nf_conntrack_expect *exp; |
| 1489 | struct nf_conn *ct; |
| 1490 | struct nf_conn_help *help; |
| 1491 | int err = 0; |
| 1492 | |
| 1493 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1494 | |
| 1495 | /* caller guarantees that those three CTA_EXPECT_* exist */ |
| 1496 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1497 | if (err < 0) |
| 1498 | return err; |
| 1499 | err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); |
| 1500 | if (err < 0) |
| 1501 | return err; |
| 1502 | err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); |
| 1503 | if (err < 0) |
| 1504 | return err; |
| 1505 | |
| 1506 | /* Look for master conntrack of this expectation */ |
| 1507 | h = nf_conntrack_find_get(&master_tuple, NULL); |
| 1508 | if (!h) |
| 1509 | return -ENOENT; |
| 1510 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 1511 | help = nfct_help(ct); |
| 1512 | |
| 1513 | if (!help || !help->helper) { |
| 1514 | /* such conntrack hasn't got any helper, abort */ |
| 1515 | err = -EINVAL; |
| 1516 | goto out; |
| 1517 | } |
| 1518 | |
| 1519 | exp = nf_conntrack_expect_alloc(ct); |
| 1520 | if (!exp) { |
| 1521 | err = -ENOMEM; |
| 1522 | goto out; |
| 1523 | } |
| 1524 | |
| 1525 | exp->expectfn = NULL; |
| 1526 | exp->flags = 0; |
| 1527 | exp->master = ct; |
| 1528 | memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); |
| 1529 | memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple)); |
| 1530 | |
| 1531 | err = nf_conntrack_expect_related(exp); |
| 1532 | nf_conntrack_expect_put(exp); |
| 1533 | |
| 1534 | out: |
| 1535 | nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); |
| 1536 | return err; |
| 1537 | } |
| 1538 | |
| 1539 | static int |
| 1540 | ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, |
| 1541 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1542 | { |
| 1543 | struct nf_conntrack_tuple tuple; |
| 1544 | struct nf_conntrack_expect *exp; |
| 1545 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1546 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1547 | int err = 0; |
| 1548 | |
| 1549 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1550 | |
| 1551 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1552 | return -EINVAL; |
| 1553 | |
| 1554 | if (!cda[CTA_EXPECT_TUPLE-1] |
| 1555 | || !cda[CTA_EXPECT_MASK-1] |
| 1556 | || !cda[CTA_EXPECT_MASTER-1]) |
| 1557 | return -EINVAL; |
| 1558 | |
| 1559 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1560 | if (err < 0) |
| 1561 | return err; |
| 1562 | |
| 1563 | write_lock_bh(&nf_conntrack_lock); |
| 1564 | exp = __nf_conntrack_expect_find(&tuple); |
| 1565 | |
| 1566 | if (!exp) { |
| 1567 | write_unlock_bh(&nf_conntrack_lock); |
| 1568 | err = -ENOENT; |
| 1569 | if (nlh->nlmsg_flags & NLM_F_CREATE) |
| 1570 | err = ctnetlink_create_expect(cda, u3); |
| 1571 | return err; |
| 1572 | } |
| 1573 | |
| 1574 | err = -EEXIST; |
| 1575 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
| 1576 | err = ctnetlink_change_expect(exp, cda); |
| 1577 | write_unlock_bh(&nf_conntrack_lock); |
| 1578 | |
| 1579 | DEBUGP("leaving\n"); |
| 1580 | |
| 1581 | return err; |
| 1582 | } |
| 1583 | |
| 1584 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1585 | static struct notifier_block ctnl_notifier = { |
| 1586 | .notifier_call = ctnetlink_conntrack_event, |
| 1587 | }; |
| 1588 | |
| 1589 | static struct notifier_block ctnl_notifier_exp = { |
| 1590 | .notifier_call = ctnetlink_expect_event, |
| 1591 | }; |
| 1592 | #endif |
| 1593 | |
| 1594 | static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { |
| 1595 | [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack, |
| 1596 | .attr_count = CTA_MAX, }, |
| 1597 | [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack, |
| 1598 | .attr_count = CTA_MAX, }, |
| 1599 | [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack, |
| 1600 | .attr_count = CTA_MAX, }, |
| 1601 | [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack, |
| 1602 | .attr_count = CTA_MAX, }, |
| 1603 | }; |
| 1604 | |
| 1605 | static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { |
| 1606 | [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect, |
| 1607 | .attr_count = CTA_EXPECT_MAX, }, |
| 1608 | [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect, |
| 1609 | .attr_count = CTA_EXPECT_MAX, }, |
| 1610 | [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect, |
| 1611 | .attr_count = CTA_EXPECT_MAX, }, |
| 1612 | }; |
| 1613 | |
| 1614 | static struct nfnetlink_subsystem ctnl_subsys = { |
| 1615 | .name = "conntrack", |
| 1616 | .subsys_id = NFNL_SUBSYS_CTNETLINK, |
| 1617 | .cb_count = IPCTNL_MSG_MAX, |
| 1618 | .cb = ctnl_cb, |
| 1619 | }; |
| 1620 | |
| 1621 | static struct nfnetlink_subsystem ctnl_exp_subsys = { |
| 1622 | .name = "conntrack_expect", |
| 1623 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, |
| 1624 | .cb_count = IPCTNL_MSG_EXP_MAX, |
| 1625 | .cb = ctnl_exp_cb, |
| 1626 | }; |
| 1627 | |
| 1628 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); |
| 1629 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
| 1630 | |
| 1631 | static int __init ctnetlink_init(void) |
| 1632 | { |
| 1633 | int ret; |
| 1634 | |
| 1635 | printk("ctnetlink v%s: registering with nfnetlink.\n", version); |
| 1636 | ret = nfnetlink_subsys_register(&ctnl_subsys); |
| 1637 | if (ret < 0) { |
| 1638 | printk("ctnetlink_init: cannot register with nfnetlink.\n"); |
| 1639 | goto err_out; |
| 1640 | } |
| 1641 | |
| 1642 | ret = nfnetlink_subsys_register(&ctnl_exp_subsys); |
| 1643 | if (ret < 0) { |
| 1644 | printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); |
| 1645 | goto err_unreg_subsys; |
| 1646 | } |
| 1647 | |
| 1648 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1649 | ret = nf_conntrack_register_notifier(&ctnl_notifier); |
| 1650 | if (ret < 0) { |
| 1651 | printk("ctnetlink_init: cannot register notifier.\n"); |
| 1652 | goto err_unreg_exp_subsys; |
| 1653 | } |
| 1654 | |
| 1655 | ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp); |
| 1656 | if (ret < 0) { |
| 1657 | printk("ctnetlink_init: cannot expect register notifier.\n"); |
| 1658 | goto err_unreg_notifier; |
| 1659 | } |
| 1660 | #endif |
| 1661 | |
| 1662 | return 0; |
| 1663 | |
| 1664 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1665 | err_unreg_notifier: |
| 1666 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
| 1667 | err_unreg_exp_subsys: |
| 1668 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| 1669 | #endif |
| 1670 | err_unreg_subsys: |
| 1671 | nfnetlink_subsys_unregister(&ctnl_subsys); |
| 1672 | err_out: |
| 1673 | return ret; |
| 1674 | } |
| 1675 | |
| 1676 | static void __exit ctnetlink_exit(void) |
| 1677 | { |
| 1678 | printk("ctnetlink: unregistering from nfnetlink.\n"); |
| 1679 | |
| 1680 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1681 | nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp); |
| 1682 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
| 1683 | #endif |
| 1684 | |
| 1685 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| 1686 | nfnetlink_subsys_unregister(&ctnl_subsys); |
| 1687 | return; |
| 1688 | } |
| 1689 | |
| 1690 | module_init(ctnetlink_init); |
| 1691 | module_exit(ctnetlink_exit); |