Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 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> |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 5 | * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org> |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 6 | * (C) 2003 by Patrick Mchardy <kaber@trash.net> |
| 7 | * (C) 2005 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 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 47 | static char __initdata version[] = "0.93"; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 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 | { |
| 60 | struct nf_conntrack_protocol *proto; |
| 61 | int ret = 0; |
| 62 | |
| 63 | NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum); |
| 64 | |
| 65 | /* If no protocol helper is found, this function will return the |
| 66 | * generic protocol helper, so proto won't *ever* be NULL */ |
| 67 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| 68 | if (likely(proto->tuple_to_nfattr)) |
| 69 | ret = proto->tuple_to_nfattr(skb, tuple); |
| 70 | |
| 71 | nf_ct_proto_put(proto); |
| 72 | |
| 73 | return ret; |
| 74 | |
| 75 | nfattr_failure: |
| 76 | return -1; |
| 77 | } |
| 78 | |
| 79 | static inline int |
| 80 | ctnetlink_dump_tuples(struct sk_buff *skb, |
| 81 | const struct nf_conntrack_tuple *tuple) |
| 82 | { |
| 83 | struct nfattr *nest_parms; |
| 84 | struct nf_conntrack_l3proto *l3proto; |
| 85 | int ret = 0; |
| 86 | |
| 87 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 88 | |
| 89 | nest_parms = NFA_NEST(skb, CTA_TUPLE_IP); |
| 90 | if (likely(l3proto->tuple_to_nfattr)) |
| 91 | ret = l3proto->tuple_to_nfattr(skb, tuple); |
| 92 | NFA_NEST_END(skb, nest_parms); |
| 93 | |
| 94 | nf_ct_l3proto_put(l3proto); |
| 95 | |
| 96 | if (unlikely(ret < 0)) |
| 97 | return ret; |
| 98 | |
| 99 | nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO); |
| 100 | ret = ctnetlink_dump_tuples_proto(skb, tuple); |
| 101 | NFA_NEST_END(skb, nest_parms); |
| 102 | |
| 103 | return ret; |
| 104 | |
| 105 | nfattr_failure: |
| 106 | return -1; |
| 107 | } |
| 108 | |
| 109 | static inline int |
| 110 | ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) |
| 111 | { |
| 112 | u_int32_t status = htonl((u_int32_t) ct->status); |
| 113 | NFA_PUT(skb, CTA_STATUS, sizeof(status), &status); |
| 114 | return 0; |
| 115 | |
| 116 | nfattr_failure: |
| 117 | return -1; |
| 118 | } |
| 119 | |
| 120 | static inline int |
| 121 | ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) |
| 122 | { |
| 123 | long timeout_l = ct->timeout.expires - jiffies; |
| 124 | u_int32_t timeout; |
| 125 | |
| 126 | if (timeout_l < 0) |
| 127 | timeout = 0; |
| 128 | else |
| 129 | timeout = htonl(timeout_l / HZ); |
| 130 | |
| 131 | NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout); |
| 132 | return 0; |
| 133 | |
| 134 | nfattr_failure: |
| 135 | return -1; |
| 136 | } |
| 137 | |
| 138 | static inline int |
| 139 | ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct) |
| 140 | { |
| 141 | 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); |
| 142 | struct nfattr *nest_proto; |
| 143 | int ret; |
| 144 | |
| 145 | if (!proto->to_nfattr) { |
| 146 | nf_ct_proto_put(proto); |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | nest_proto = NFA_NEST(skb, CTA_PROTOINFO); |
| 151 | |
| 152 | ret = proto->to_nfattr(skb, nest_proto, ct); |
| 153 | |
| 154 | nf_ct_proto_put(proto); |
| 155 | |
| 156 | NFA_NEST_END(skb, nest_proto); |
| 157 | |
| 158 | return ret; |
| 159 | |
| 160 | nfattr_failure: |
| 161 | return -1; |
| 162 | } |
| 163 | |
| 164 | static inline int |
| 165 | ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct) |
| 166 | { |
| 167 | struct nfattr *nest_helper; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 168 | const struct nf_conn_help *help = nfct_help(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 169 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 170 | if (!help || !help->helper) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 171 | return 0; |
| 172 | |
| 173 | nest_helper = NFA_NEST(skb, CTA_HELP); |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 174 | NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 175 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 176 | if (help->helper->to_nfattr) |
| 177 | help->helper->to_nfattr(skb, ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 178 | |
| 179 | NFA_NEST_END(skb, nest_helper); |
| 180 | |
| 181 | return 0; |
| 182 | |
| 183 | nfattr_failure: |
| 184 | return -1; |
| 185 | } |
| 186 | |
| 187 | #ifdef CONFIG_NF_CT_ACCT |
| 188 | static inline int |
| 189 | ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct, |
| 190 | enum ip_conntrack_dir dir) |
| 191 | { |
| 192 | enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; |
| 193 | struct nfattr *nest_count = NFA_NEST(skb, type); |
| 194 | u_int32_t tmp; |
| 195 | |
| 196 | tmp = htonl(ct->counters[dir].packets); |
| 197 | NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp); |
| 198 | |
| 199 | tmp = htonl(ct->counters[dir].bytes); |
| 200 | NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp); |
| 201 | |
| 202 | NFA_NEST_END(skb, nest_count); |
| 203 | |
| 204 | return 0; |
| 205 | |
| 206 | nfattr_failure: |
| 207 | return -1; |
| 208 | } |
| 209 | #else |
| 210 | #define ctnetlink_dump_counters(a, b, c) (0) |
| 211 | #endif |
| 212 | |
| 213 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 214 | static inline int |
| 215 | ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) |
| 216 | { |
| 217 | u_int32_t mark = htonl(ct->mark); |
| 218 | |
| 219 | NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark); |
| 220 | return 0; |
| 221 | |
| 222 | nfattr_failure: |
| 223 | return -1; |
| 224 | } |
| 225 | #else |
| 226 | #define ctnetlink_dump_mark(a, b) (0) |
| 227 | #endif |
| 228 | |
| 229 | static inline int |
| 230 | ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) |
| 231 | { |
| 232 | u_int32_t id = htonl(ct->id); |
| 233 | NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id); |
| 234 | return 0; |
| 235 | |
| 236 | nfattr_failure: |
| 237 | return -1; |
| 238 | } |
| 239 | |
| 240 | static inline int |
| 241 | ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) |
| 242 | { |
| 243 | u_int32_t use = htonl(atomic_read(&ct->ct_general.use)); |
| 244 | |
| 245 | NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use); |
| 246 | return 0; |
| 247 | |
| 248 | nfattr_failure: |
| 249 | return -1; |
| 250 | } |
| 251 | |
| 252 | #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) |
| 253 | |
| 254 | static int |
| 255 | ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| 256 | int event, int nowait, |
| 257 | const struct nf_conn *ct) |
| 258 | { |
| 259 | struct nlmsghdr *nlh; |
| 260 | struct nfgenmsg *nfmsg; |
| 261 | struct nfattr *nest_parms; |
| 262 | unsigned char *b; |
| 263 | |
| 264 | b = skb->tail; |
| 265 | |
| 266 | event |= NFNL_SUBSYS_CTNETLINK << 8; |
| 267 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| 268 | nfmsg = NLMSG_DATA(nlh); |
| 269 | |
| 270 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
| 271 | nfmsg->nfgen_family = |
| 272 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 273 | nfmsg->version = NFNETLINK_V0; |
| 274 | nfmsg->res_id = 0; |
| 275 | |
| 276 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); |
| 277 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| 278 | goto nfattr_failure; |
| 279 | NFA_NEST_END(skb, nest_parms); |
| 280 | |
| 281 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
| 282 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| 283 | goto nfattr_failure; |
| 284 | NFA_NEST_END(skb, nest_parms); |
| 285 | |
| 286 | if (ctnetlink_dump_status(skb, ct) < 0 || |
| 287 | ctnetlink_dump_timeout(skb, ct) < 0 || |
| 288 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| 289 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 || |
| 290 | ctnetlink_dump_protoinfo(skb, ct) < 0 || |
| 291 | ctnetlink_dump_helpinfo(skb, ct) < 0 || |
| 292 | ctnetlink_dump_mark(skb, ct) < 0 || |
| 293 | ctnetlink_dump_id(skb, ct) < 0 || |
| 294 | ctnetlink_dump_use(skb, ct) < 0) |
| 295 | goto nfattr_failure; |
| 296 | |
| 297 | nlh->nlmsg_len = skb->tail - b; |
| 298 | return skb->len; |
| 299 | |
| 300 | nlmsg_failure: |
| 301 | nfattr_failure: |
| 302 | skb_trim(skb, b - skb->data); |
| 303 | return -1; |
| 304 | } |
| 305 | |
| 306 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 307 | static int ctnetlink_conntrack_event(struct notifier_block *this, |
| 308 | unsigned long events, void *ptr) |
| 309 | { |
| 310 | struct nlmsghdr *nlh; |
| 311 | struct nfgenmsg *nfmsg; |
| 312 | struct nfattr *nest_parms; |
| 313 | struct nf_conn *ct = (struct nf_conn *)ptr; |
| 314 | struct sk_buff *skb; |
| 315 | unsigned int type; |
| 316 | unsigned char *b; |
| 317 | unsigned int flags = 0, group; |
| 318 | |
| 319 | /* ignore our fake conntrack entry */ |
| 320 | if (ct == &nf_conntrack_untracked) |
| 321 | return NOTIFY_DONE; |
| 322 | |
| 323 | if (events & IPCT_DESTROY) { |
| 324 | type = IPCTNL_MSG_CT_DELETE; |
| 325 | group = NFNLGRP_CONNTRACK_DESTROY; |
| 326 | } else if (events & (IPCT_NEW | IPCT_RELATED)) { |
| 327 | type = IPCTNL_MSG_CT_NEW; |
| 328 | flags = NLM_F_CREATE|NLM_F_EXCL; |
| 329 | /* dump everything */ |
| 330 | events = ~0UL; |
| 331 | group = NFNLGRP_CONNTRACK_NEW; |
| 332 | } else if (events & (IPCT_STATUS | |
| 333 | IPCT_PROTOINFO | |
| 334 | IPCT_HELPER | |
| 335 | IPCT_HELPINFO | |
| 336 | IPCT_NATINFO)) { |
| 337 | type = IPCTNL_MSG_CT_NEW; |
| 338 | group = NFNLGRP_CONNTRACK_UPDATE; |
| 339 | } else |
| 340 | return NOTIFY_DONE; |
| 341 | |
| 342 | /* FIXME: Check if there are any listeners before, don't hurt performance */ |
| 343 | |
| 344 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 345 | if (!skb) |
| 346 | return NOTIFY_DONE; |
| 347 | |
| 348 | b = skb->tail; |
| 349 | |
| 350 | type |= NFNL_SUBSYS_CTNETLINK << 8; |
| 351 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| 352 | nfmsg = NLMSG_DATA(nlh); |
| 353 | |
| 354 | nlh->nlmsg_flags = flags; |
| 355 | nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 356 | nfmsg->version = NFNETLINK_V0; |
| 357 | nfmsg->res_id = 0; |
| 358 | |
| 359 | nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG); |
| 360 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| 361 | goto nfattr_failure; |
| 362 | NFA_NEST_END(skb, nest_parms); |
| 363 | |
| 364 | nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY); |
| 365 | if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| 366 | goto nfattr_failure; |
| 367 | NFA_NEST_END(skb, nest_parms); |
| 368 | |
| 369 | /* NAT stuff is now a status flag */ |
| 370 | if ((events & IPCT_STATUS || events & IPCT_NATINFO) |
| 371 | && ctnetlink_dump_status(skb, ct) < 0) |
| 372 | goto nfattr_failure; |
| 373 | if (events & IPCT_REFRESH |
| 374 | && ctnetlink_dump_timeout(skb, ct) < 0) |
| 375 | goto nfattr_failure; |
| 376 | if (events & IPCT_PROTOINFO |
| 377 | && ctnetlink_dump_protoinfo(skb, ct) < 0) |
| 378 | goto nfattr_failure; |
| 379 | if (events & IPCT_HELPINFO |
| 380 | && ctnetlink_dump_helpinfo(skb, ct) < 0) |
| 381 | goto nfattr_failure; |
| 382 | |
| 383 | if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| 384 | ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) |
| 385 | goto nfattr_failure; |
| 386 | |
| 387 | nlh->nlmsg_len = skb->tail - b; |
| 388 | nfnetlink_send(skb, 0, group, 0); |
| 389 | return NOTIFY_DONE; |
| 390 | |
| 391 | nlmsg_failure: |
| 392 | nfattr_failure: |
| 393 | kfree_skb(skb); |
| 394 | return NOTIFY_DONE; |
| 395 | } |
| 396 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ |
| 397 | |
| 398 | static int ctnetlink_done(struct netlink_callback *cb) |
| 399 | { |
| 400 | DEBUGP("entered %s\n", __FUNCTION__); |
| 401 | return 0; |
| 402 | } |
| 403 | |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 404 | #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num |
| 405 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 406 | static int |
| 407 | ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| 408 | { |
| 409 | struct nf_conn *ct = NULL; |
| 410 | struct nf_conntrack_tuple_hash *h; |
| 411 | struct list_head *i; |
| 412 | u_int32_t *id = (u_int32_t *) &cb->args[1]; |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 413 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 414 | u_int8_t l3proto = nfmsg->nfgen_family; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 415 | |
| 416 | DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__, |
| 417 | cb->args[0], *id); |
| 418 | |
| 419 | read_lock_bh(&nf_conntrack_lock); |
| 420 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) { |
| 421 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
| 422 | h = (struct nf_conntrack_tuple_hash *) i; |
| 423 | if (DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 424 | continue; |
| 425 | ct = nf_ct_tuplehash_to_ctrack(h); |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 426 | /* Dump entries of a given L3 protocol number. |
| 427 | * If it is not specified, ie. l3proto == 0, |
| 428 | * then dump everything. */ |
| 429 | if (l3proto && L3PROTO(ct) != l3proto) |
| 430 | continue; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 431 | if (ct->id <= *id) |
| 432 | continue; |
| 433 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| 434 | cb->nlh->nlmsg_seq, |
| 435 | IPCTNL_MSG_CT_NEW, |
| 436 | 1, ct) < 0) |
| 437 | goto out; |
| 438 | *id = ct->id; |
| 439 | } |
| 440 | } |
| 441 | out: |
| 442 | read_unlock_bh(&nf_conntrack_lock); |
| 443 | |
| 444 | DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id); |
| 445 | |
| 446 | return skb->len; |
| 447 | } |
| 448 | |
| 449 | #ifdef CONFIG_NF_CT_ACCT |
| 450 | static int |
| 451 | ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb) |
| 452 | { |
| 453 | struct nf_conn *ct = NULL; |
| 454 | struct nf_conntrack_tuple_hash *h; |
| 455 | struct list_head *i; |
| 456 | u_int32_t *id = (u_int32_t *) &cb->args[1]; |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 457 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 458 | u_int8_t l3proto = nfmsg->nfgen_family; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 459 | |
| 460 | DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__, |
| 461 | cb->args[0], *id); |
| 462 | |
| 463 | write_lock_bh(&nf_conntrack_lock); |
| 464 | for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) { |
| 465 | list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) { |
| 466 | h = (struct nf_conntrack_tuple_hash *) i; |
| 467 | if (DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 468 | continue; |
| 469 | ct = nf_ct_tuplehash_to_ctrack(h); |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 470 | if (l3proto && L3PROTO(ct) != l3proto) |
| 471 | continue; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 472 | if (ct->id <= *id) |
| 473 | continue; |
| 474 | if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| 475 | cb->nlh->nlmsg_seq, |
| 476 | IPCTNL_MSG_CT_NEW, |
| 477 | 1, ct) < 0) |
| 478 | goto out; |
| 479 | *id = ct->id; |
| 480 | |
| 481 | memset(&ct->counters, 0, sizeof(ct->counters)); |
| 482 | } |
| 483 | } |
| 484 | out: |
| 485 | write_unlock_bh(&nf_conntrack_lock); |
| 486 | |
| 487 | DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id); |
| 488 | |
| 489 | return skb->len; |
| 490 | } |
| 491 | #endif |
| 492 | |
| 493 | static inline int |
| 494 | ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple) |
| 495 | { |
| 496 | struct nfattr *tb[CTA_IP_MAX]; |
| 497 | struct nf_conntrack_l3proto *l3proto; |
| 498 | int ret = 0; |
| 499 | |
| 500 | DEBUGP("entered %s\n", __FUNCTION__); |
| 501 | |
| 502 | nfattr_parse_nested(tb, CTA_IP_MAX, attr); |
| 503 | |
| 504 | l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| 505 | |
| 506 | if (likely(l3proto->nfattr_to_tuple)) |
| 507 | ret = l3proto->nfattr_to_tuple(tb, tuple); |
| 508 | |
| 509 | nf_ct_l3proto_put(l3proto); |
| 510 | |
| 511 | DEBUGP("leaving\n"); |
| 512 | |
| 513 | return ret; |
| 514 | } |
| 515 | |
| 516 | static const size_t cta_min_proto[CTA_PROTO_MAX] = { |
| 517 | [CTA_PROTO_NUM-1] = sizeof(u_int8_t), |
| 518 | }; |
| 519 | |
| 520 | static inline int |
| 521 | ctnetlink_parse_tuple_proto(struct nfattr *attr, |
| 522 | struct nf_conntrack_tuple *tuple) |
| 523 | { |
| 524 | struct nfattr *tb[CTA_PROTO_MAX]; |
| 525 | struct nf_conntrack_protocol *proto; |
| 526 | int ret = 0; |
| 527 | |
| 528 | DEBUGP("entered %s\n", __FUNCTION__); |
| 529 | |
| 530 | nfattr_parse_nested(tb, CTA_PROTO_MAX, attr); |
| 531 | |
| 532 | if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto)) |
| 533 | return -EINVAL; |
| 534 | |
| 535 | if (!tb[CTA_PROTO_NUM-1]) |
| 536 | return -EINVAL; |
| 537 | tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]); |
| 538 | |
| 539 | proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| 540 | |
| 541 | if (likely(proto->nfattr_to_tuple)) |
| 542 | ret = proto->nfattr_to_tuple(tb, tuple); |
| 543 | |
| 544 | nf_ct_proto_put(proto); |
| 545 | |
| 546 | return ret; |
| 547 | } |
| 548 | |
| 549 | static inline int |
| 550 | ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple, |
| 551 | enum ctattr_tuple type, u_int8_t l3num) |
| 552 | { |
| 553 | struct nfattr *tb[CTA_TUPLE_MAX]; |
| 554 | int err; |
| 555 | |
| 556 | DEBUGP("entered %s\n", __FUNCTION__); |
| 557 | |
| 558 | memset(tuple, 0, sizeof(*tuple)); |
| 559 | |
| 560 | nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]); |
| 561 | |
| 562 | if (!tb[CTA_TUPLE_IP-1]) |
| 563 | return -EINVAL; |
| 564 | |
| 565 | tuple->src.l3num = l3num; |
| 566 | |
| 567 | err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple); |
| 568 | if (err < 0) |
| 569 | return err; |
| 570 | |
| 571 | if (!tb[CTA_TUPLE_PROTO-1]) |
| 572 | return -EINVAL; |
| 573 | |
| 574 | err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple); |
| 575 | if (err < 0) |
| 576 | return err; |
| 577 | |
| 578 | /* orig and expect tuples get DIR_ORIGINAL */ |
| 579 | if (type == CTA_TUPLE_REPLY) |
| 580 | tuple->dst.dir = IP_CT_DIR_REPLY; |
| 581 | else |
| 582 | tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
| 583 | |
| 584 | NF_CT_DUMP_TUPLE(tuple); |
| 585 | |
| 586 | DEBUGP("leaving\n"); |
| 587 | |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | #ifdef CONFIG_IP_NF_NAT_NEEDED |
| 592 | static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = { |
| 593 | [CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t), |
| 594 | [CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t), |
| 595 | }; |
| 596 | |
| 597 | static int ctnetlink_parse_nat_proto(struct nfattr *attr, |
| 598 | const struct nf_conn *ct, |
| 599 | struct ip_nat_range *range) |
| 600 | { |
| 601 | struct nfattr *tb[CTA_PROTONAT_MAX]; |
| 602 | struct ip_nat_protocol *npt; |
| 603 | |
| 604 | DEBUGP("entered %s\n", __FUNCTION__); |
| 605 | |
| 606 | nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr); |
| 607 | |
| 608 | if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat)) |
| 609 | return -EINVAL; |
| 610 | |
| 611 | npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum); |
| 612 | |
| 613 | if (!npt->nfattr_to_range) { |
| 614 | ip_nat_proto_put(npt); |
| 615 | return 0; |
| 616 | } |
| 617 | |
| 618 | /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */ |
| 619 | if (npt->nfattr_to_range(tb, range) > 0) |
| 620 | range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED; |
| 621 | |
| 622 | ip_nat_proto_put(npt); |
| 623 | |
| 624 | DEBUGP("leaving\n"); |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | static const size_t cta_min_nat[CTA_NAT_MAX] = { |
| 629 | [CTA_NAT_MINIP-1] = sizeof(u_int32_t), |
| 630 | [CTA_NAT_MAXIP-1] = sizeof(u_int32_t), |
| 631 | }; |
| 632 | |
| 633 | static inline int |
| 634 | ctnetlink_parse_nat(struct nfattr *cda[], |
| 635 | const struct nf_conn *ct, struct ip_nat_range *range) |
| 636 | { |
| 637 | struct nfattr *tb[CTA_NAT_MAX]; |
| 638 | int err; |
| 639 | |
| 640 | DEBUGP("entered %s\n", __FUNCTION__); |
| 641 | |
| 642 | memset(range, 0, sizeof(*range)); |
| 643 | |
| 644 | nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]); |
| 645 | |
| 646 | if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat)) |
| 647 | return -EINVAL; |
| 648 | |
| 649 | if (tb[CTA_NAT_MINIP-1]) |
| 650 | range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]); |
| 651 | |
| 652 | if (!tb[CTA_NAT_MAXIP-1]) |
| 653 | range->max_ip = range->min_ip; |
| 654 | else |
| 655 | range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]); |
| 656 | |
| 657 | if (range->min_ip) |
| 658 | range->flags |= IP_NAT_RANGE_MAP_IPS; |
| 659 | |
| 660 | if (!tb[CTA_NAT_PROTO-1]) |
| 661 | return 0; |
| 662 | |
| 663 | err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range); |
| 664 | if (err < 0) |
| 665 | return err; |
| 666 | |
| 667 | DEBUGP("leaving\n"); |
| 668 | return 0; |
| 669 | } |
| 670 | #endif |
| 671 | |
| 672 | static inline int |
| 673 | ctnetlink_parse_help(struct nfattr *attr, char **helper_name) |
| 674 | { |
| 675 | struct nfattr *tb[CTA_HELP_MAX]; |
| 676 | |
| 677 | DEBUGP("entered %s\n", __FUNCTION__); |
| 678 | |
| 679 | nfattr_parse_nested(tb, CTA_HELP_MAX, attr); |
| 680 | |
| 681 | if (!tb[CTA_HELP_NAME-1]) |
| 682 | return -EINVAL; |
| 683 | |
| 684 | *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]); |
| 685 | |
| 686 | return 0; |
| 687 | } |
| 688 | |
| 689 | static const size_t cta_min[CTA_MAX] = { |
| 690 | [CTA_STATUS-1] = sizeof(u_int32_t), |
| 691 | [CTA_TIMEOUT-1] = sizeof(u_int32_t), |
| 692 | [CTA_MARK-1] = sizeof(u_int32_t), |
| 693 | [CTA_USE-1] = sizeof(u_int32_t), |
| 694 | [CTA_ID-1] = sizeof(u_int32_t) |
| 695 | }; |
| 696 | |
| 697 | static int |
| 698 | ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| 699 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 700 | { |
| 701 | struct nf_conntrack_tuple_hash *h; |
| 702 | struct nf_conntrack_tuple tuple; |
| 703 | struct nf_conn *ct; |
| 704 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 705 | u_int8_t u3 = nfmsg->nfgen_family; |
| 706 | int err = 0; |
| 707 | |
| 708 | DEBUGP("entered %s\n", __FUNCTION__); |
| 709 | |
| 710 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 711 | return -EINVAL; |
| 712 | |
| 713 | if (cda[CTA_TUPLE_ORIG-1]) |
| 714 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| 715 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 716 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| 717 | else { |
| 718 | /* Flush the whole table */ |
| 719 | nf_conntrack_flush(); |
| 720 | return 0; |
| 721 | } |
| 722 | |
| 723 | if (err < 0) |
| 724 | return err; |
| 725 | |
| 726 | h = nf_conntrack_find_get(&tuple, NULL); |
| 727 | if (!h) { |
| 728 | DEBUGP("tuple not found in conntrack hash\n"); |
| 729 | return -ENOENT; |
| 730 | } |
| 731 | |
| 732 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 733 | |
| 734 | if (cda[CTA_ID-1]) { |
| 735 | u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1])); |
| 736 | if (ct->id != id) { |
| 737 | nf_ct_put(ct); |
| 738 | return -ENOENT; |
| 739 | } |
| 740 | } |
| 741 | if (del_timer(&ct->timeout)) |
| 742 | ct->timeout.function((unsigned long)ct); |
| 743 | |
| 744 | nf_ct_put(ct); |
| 745 | DEBUGP("leaving\n"); |
| 746 | |
| 747 | return 0; |
| 748 | } |
| 749 | |
| 750 | static int |
| 751 | ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| 752 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 753 | { |
| 754 | struct nf_conntrack_tuple_hash *h; |
| 755 | struct nf_conntrack_tuple tuple; |
| 756 | struct nf_conn *ct; |
| 757 | struct sk_buff *skb2 = NULL; |
| 758 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 759 | u_int8_t u3 = nfmsg->nfgen_family; |
| 760 | int err = 0; |
| 761 | |
| 762 | DEBUGP("entered %s\n", __FUNCTION__); |
| 763 | |
| 764 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 765 | u32 rlen; |
| 766 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 767 | if (NFNL_MSG_TYPE(nlh->nlmsg_type) == |
| 768 | IPCTNL_MSG_CT_GET_CTRZERO) { |
| 769 | #ifdef CONFIG_NF_CT_ACCT |
| 770 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
| 771 | ctnetlink_dump_table_w, |
| 772 | ctnetlink_done)) != 0) |
| 773 | return -EINVAL; |
| 774 | #else |
| 775 | return -ENOTSUPP; |
| 776 | #endif |
| 777 | } else { |
| 778 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
| 779 | ctnetlink_dump_table, |
| 780 | ctnetlink_done)) != 0) |
| 781 | return -EINVAL; |
| 782 | } |
| 783 | |
| 784 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| 785 | if (rlen > skb->len) |
| 786 | rlen = skb->len; |
| 787 | skb_pull(skb, rlen); |
| 788 | return 0; |
| 789 | } |
| 790 | |
| 791 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 792 | return -EINVAL; |
| 793 | |
| 794 | if (cda[CTA_TUPLE_ORIG-1]) |
| 795 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| 796 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 797 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| 798 | else |
| 799 | return -EINVAL; |
| 800 | |
| 801 | if (err < 0) |
| 802 | return err; |
| 803 | |
| 804 | h = nf_conntrack_find_get(&tuple, NULL); |
| 805 | if (!h) { |
| 806 | DEBUGP("tuple not found in conntrack hash"); |
| 807 | return -ENOENT; |
| 808 | } |
| 809 | DEBUGP("tuple found\n"); |
| 810 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 811 | |
| 812 | err = -ENOMEM; |
| 813 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 814 | if (!skb2) { |
| 815 | nf_ct_put(ct); |
| 816 | return -ENOMEM; |
| 817 | } |
| 818 | NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid; |
| 819 | |
| 820 | err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, |
| 821 | IPCTNL_MSG_CT_NEW, 1, ct); |
| 822 | nf_ct_put(ct); |
| 823 | if (err <= 0) |
| 824 | goto free; |
| 825 | |
| 826 | err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 827 | if (err < 0) |
| 828 | goto out; |
| 829 | |
| 830 | DEBUGP("leaving\n"); |
| 831 | return 0; |
| 832 | |
| 833 | free: |
| 834 | kfree_skb(skb2); |
| 835 | out: |
| 836 | return err; |
| 837 | } |
| 838 | |
| 839 | static inline int |
| 840 | ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[]) |
| 841 | { |
| 842 | unsigned long d; |
| 843 | unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1])); |
| 844 | d = ct->status ^ status; |
| 845 | |
| 846 | if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING)) |
| 847 | /* unchangeable */ |
| 848 | return -EINVAL; |
| 849 | |
| 850 | if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY)) |
| 851 | /* SEEN_REPLY bit can only be set */ |
| 852 | return -EINVAL; |
| 853 | |
| 854 | |
| 855 | if (d & IPS_ASSURED && !(status & IPS_ASSURED)) |
| 856 | /* ASSURED bit can only be set */ |
| 857 | return -EINVAL; |
| 858 | |
| 859 | if (cda[CTA_NAT-1]) { |
| 860 | #ifndef CONFIG_IP_NF_NAT_NEEDED |
| 861 | return -EINVAL; |
| 862 | #else |
| 863 | unsigned int hooknum; |
| 864 | struct ip_nat_range range; |
| 865 | |
| 866 | if (ctnetlink_parse_nat(cda, ct, &range) < 0) |
| 867 | return -EINVAL; |
| 868 | |
| 869 | DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n", |
| 870 | NIPQUAD(range.min_ip), NIPQUAD(range.max_ip), |
| 871 | htons(range.min.all), htons(range.max.all)); |
| 872 | |
| 873 | /* This is tricky but it works. ip_nat_setup_info needs the |
| 874 | * hook number as parameter, so let's do the correct |
| 875 | * conversion and run away */ |
| 876 | if (status & IPS_SRC_NAT_DONE) |
| 877 | hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */ |
| 878 | else if (status & IPS_DST_NAT_DONE) |
| 879 | hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */ |
| 880 | else |
| 881 | return -EINVAL; /* Missing NAT flags */ |
| 882 | |
| 883 | DEBUGP("NAT status: %lu\n", |
| 884 | status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK)); |
| 885 | |
| 886 | if (ip_nat_initialized(ct, HOOK2MANIP(hooknum))) |
| 887 | return -EEXIST; |
| 888 | ip_nat_setup_info(ct, &range, hooknum); |
| 889 | |
| 890 | DEBUGP("NAT status after setup_info: %lu\n", |
| 891 | ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK)); |
| 892 | #endif |
| 893 | } |
| 894 | |
| 895 | /* Be careful here, modifying NAT bits can screw up things, |
| 896 | * so don't let users modify them directly if they don't pass |
| 897 | * ip_nat_range. */ |
| 898 | ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); |
| 899 | return 0; |
| 900 | } |
| 901 | |
| 902 | |
| 903 | static inline int |
| 904 | ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[]) |
| 905 | { |
| 906 | struct nf_conntrack_helper *helper; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 907 | struct nf_conn_help *help = nfct_help(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 908 | char *helpname; |
| 909 | int err; |
| 910 | |
| 911 | DEBUGP("entered %s\n", __FUNCTION__); |
| 912 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 913 | if (!help) { |
| 914 | /* FIXME: we need to reallocate and rehash */ |
| 915 | return -EBUSY; |
| 916 | } |
| 917 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 918 | /* don't change helper of sibling connections */ |
| 919 | if (ct->master) |
| 920 | return -EINVAL; |
| 921 | |
| 922 | err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname); |
| 923 | if (err < 0) |
| 924 | return err; |
| 925 | |
| 926 | helper = __nf_conntrack_helper_find_byname(helpname); |
| 927 | if (!helper) { |
| 928 | if (!strcmp(helpname, "")) |
| 929 | helper = NULL; |
| 930 | else |
| 931 | return -EINVAL; |
| 932 | } |
| 933 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 934 | if (help->helper) { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 935 | if (!helper) { |
| 936 | /* we had a helper before ... */ |
| 937 | nf_ct_remove_expectations(ct); |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 938 | help->helper = NULL; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 939 | } else { |
| 940 | /* need to zero data of old helper */ |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 941 | memset(&help->help, 0, sizeof(help->help)); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 942 | } |
| 943 | } |
| 944 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 945 | help->helper = helper; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 946 | |
| 947 | return 0; |
| 948 | } |
| 949 | |
| 950 | static inline int |
| 951 | ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[]) |
| 952 | { |
| 953 | u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
| 954 | |
| 955 | if (!del_timer(&ct->timeout)) |
| 956 | return -ETIME; |
| 957 | |
| 958 | ct->timeout.expires = jiffies + timeout * HZ; |
| 959 | add_timer(&ct->timeout); |
| 960 | |
| 961 | return 0; |
| 962 | } |
| 963 | |
| 964 | static inline int |
| 965 | ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[]) |
| 966 | { |
| 967 | struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1]; |
| 968 | struct nf_conntrack_protocol *proto; |
| 969 | u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; |
| 970 | u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 971 | int err = 0; |
| 972 | |
| 973 | nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr); |
| 974 | |
| 975 | proto = nf_ct_proto_find_get(l3num, npt); |
| 976 | |
| 977 | if (proto->from_nfattr) |
| 978 | err = proto->from_nfattr(tb, ct); |
| 979 | nf_ct_proto_put(proto); |
| 980 | |
| 981 | return err; |
| 982 | } |
| 983 | |
| 984 | static int |
| 985 | ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[]) |
| 986 | { |
| 987 | int err; |
| 988 | |
| 989 | DEBUGP("entered %s\n", __FUNCTION__); |
| 990 | |
| 991 | if (cda[CTA_HELP-1]) { |
| 992 | err = ctnetlink_change_helper(ct, cda); |
| 993 | if (err < 0) |
| 994 | return err; |
| 995 | } |
| 996 | |
| 997 | if (cda[CTA_TIMEOUT-1]) { |
| 998 | err = ctnetlink_change_timeout(ct, cda); |
| 999 | if (err < 0) |
| 1000 | return err; |
| 1001 | } |
| 1002 | |
| 1003 | if (cda[CTA_STATUS-1]) { |
| 1004 | err = ctnetlink_change_status(ct, cda); |
| 1005 | if (err < 0) |
| 1006 | return err; |
| 1007 | } |
| 1008 | |
| 1009 | if (cda[CTA_PROTOINFO-1]) { |
| 1010 | err = ctnetlink_change_protoinfo(ct, cda); |
| 1011 | if (err < 0) |
| 1012 | return err; |
| 1013 | } |
| 1014 | |
| 1015 | #if defined(CONFIG_IP_NF_CONNTRACK_MARK) |
| 1016 | if (cda[CTA_MARK-1]) |
| 1017 | ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); |
| 1018 | #endif |
| 1019 | |
| 1020 | DEBUGP("all done\n"); |
| 1021 | return 0; |
| 1022 | } |
| 1023 | |
| 1024 | static int |
| 1025 | ctnetlink_create_conntrack(struct nfattr *cda[], |
| 1026 | struct nf_conntrack_tuple *otuple, |
| 1027 | struct nf_conntrack_tuple *rtuple) |
| 1028 | { |
| 1029 | struct nf_conn *ct; |
| 1030 | int err = -EINVAL; |
| 1031 | |
| 1032 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1033 | |
| 1034 | ct = nf_conntrack_alloc(otuple, rtuple); |
| 1035 | if (ct == NULL || IS_ERR(ct)) |
| 1036 | return -ENOMEM; |
| 1037 | |
| 1038 | if (!cda[CTA_TIMEOUT-1]) |
| 1039 | goto err; |
| 1040 | ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1])); |
| 1041 | |
| 1042 | ct->timeout.expires = jiffies + ct->timeout.expires * HZ; |
| 1043 | ct->status |= IPS_CONFIRMED; |
| 1044 | |
| 1045 | err = ctnetlink_change_status(ct, cda); |
| 1046 | if (err < 0) |
| 1047 | goto err; |
| 1048 | |
| 1049 | if (cda[CTA_PROTOINFO-1]) { |
| 1050 | err = ctnetlink_change_protoinfo(ct, cda); |
| 1051 | if (err < 0) |
| 1052 | return err; |
| 1053 | } |
| 1054 | |
| 1055 | #if defined(CONFIG_IP_NF_CONNTRACK_MARK) |
| 1056 | if (cda[CTA_MARK-1]) |
| 1057 | ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); |
| 1058 | #endif |
| 1059 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1060 | add_timer(&ct->timeout); |
| 1061 | nf_conntrack_hash_insert(ct); |
| 1062 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1063 | DEBUGP("conntrack with id %u inserted\n", ct->id); |
| 1064 | return 0; |
| 1065 | |
| 1066 | err: |
| 1067 | nf_conntrack_free(ct); |
| 1068 | return err; |
| 1069 | } |
| 1070 | |
| 1071 | static int |
| 1072 | ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| 1073 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1074 | { |
| 1075 | struct nf_conntrack_tuple otuple, rtuple; |
| 1076 | struct nf_conntrack_tuple_hash *h = NULL; |
| 1077 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1078 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1079 | int err = 0; |
| 1080 | |
| 1081 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1082 | |
| 1083 | if (nfattr_bad_size(cda, CTA_MAX, cta_min)) |
| 1084 | return -EINVAL; |
| 1085 | |
| 1086 | if (cda[CTA_TUPLE_ORIG-1]) { |
| 1087 | err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); |
| 1088 | if (err < 0) |
| 1089 | return err; |
| 1090 | } |
| 1091 | |
| 1092 | if (cda[CTA_TUPLE_REPLY-1]) { |
| 1093 | err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); |
| 1094 | if (err < 0) |
| 1095 | return err; |
| 1096 | } |
| 1097 | |
| 1098 | write_lock_bh(&nf_conntrack_lock); |
| 1099 | if (cda[CTA_TUPLE_ORIG-1]) |
| 1100 | h = __nf_conntrack_find(&otuple, NULL); |
| 1101 | else if (cda[CTA_TUPLE_REPLY-1]) |
| 1102 | h = __nf_conntrack_find(&rtuple, NULL); |
| 1103 | |
| 1104 | if (h == NULL) { |
| 1105 | write_unlock_bh(&nf_conntrack_lock); |
| 1106 | DEBUGP("no such conntrack, create new\n"); |
| 1107 | err = -ENOENT; |
| 1108 | if (nlh->nlmsg_flags & NLM_F_CREATE) |
| 1109 | err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); |
| 1110 | return err; |
| 1111 | } |
| 1112 | /* implicit 'else' */ |
| 1113 | |
| 1114 | /* we only allow nat config for new conntracks */ |
| 1115 | if (cda[CTA_NAT-1]) { |
| 1116 | err = -EINVAL; |
| 1117 | goto out_unlock; |
| 1118 | } |
| 1119 | |
| 1120 | /* We manipulate the conntrack inside the global conntrack table lock, |
| 1121 | * so there's no need to increase the refcount */ |
| 1122 | DEBUGP("conntrack found\n"); |
| 1123 | err = -EEXIST; |
| 1124 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
| 1125 | err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda); |
| 1126 | |
| 1127 | out_unlock: |
| 1128 | write_unlock_bh(&nf_conntrack_lock); |
| 1129 | return err; |
| 1130 | } |
| 1131 | |
| 1132 | /*********************************************************************** |
| 1133 | * EXPECT |
| 1134 | ***********************************************************************/ |
| 1135 | |
| 1136 | static inline int |
| 1137 | ctnetlink_exp_dump_tuple(struct sk_buff *skb, |
| 1138 | const struct nf_conntrack_tuple *tuple, |
| 1139 | enum ctattr_expect type) |
| 1140 | { |
| 1141 | struct nfattr *nest_parms = NFA_NEST(skb, type); |
| 1142 | |
| 1143 | if (ctnetlink_dump_tuples(skb, tuple) < 0) |
| 1144 | goto nfattr_failure; |
| 1145 | |
| 1146 | NFA_NEST_END(skb, nest_parms); |
| 1147 | |
| 1148 | return 0; |
| 1149 | |
| 1150 | nfattr_failure: |
| 1151 | return -1; |
| 1152 | } |
| 1153 | |
| 1154 | static inline int |
| 1155 | ctnetlink_exp_dump_expect(struct sk_buff *skb, |
| 1156 | const struct nf_conntrack_expect *exp) |
| 1157 | { |
| 1158 | struct nf_conn *master = exp->master; |
| 1159 | u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ); |
| 1160 | u_int32_t id = htonl(exp->id); |
| 1161 | |
| 1162 | if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0) |
| 1163 | goto nfattr_failure; |
| 1164 | if (ctnetlink_exp_dump_tuple(skb, &exp->mask, CTA_EXPECT_MASK) < 0) |
| 1165 | goto nfattr_failure; |
| 1166 | if (ctnetlink_exp_dump_tuple(skb, |
| 1167 | &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
| 1168 | CTA_EXPECT_MASTER) < 0) |
| 1169 | goto nfattr_failure; |
| 1170 | |
| 1171 | NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout); |
| 1172 | NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id); |
| 1173 | |
| 1174 | return 0; |
| 1175 | |
| 1176 | nfattr_failure: |
| 1177 | return -1; |
| 1178 | } |
| 1179 | |
| 1180 | static int |
| 1181 | ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| 1182 | int event, |
| 1183 | int nowait, |
| 1184 | const struct nf_conntrack_expect *exp) |
| 1185 | { |
| 1186 | struct nlmsghdr *nlh; |
| 1187 | struct nfgenmsg *nfmsg; |
| 1188 | unsigned char *b; |
| 1189 | |
| 1190 | b = skb->tail; |
| 1191 | |
| 1192 | event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
| 1193 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| 1194 | nfmsg = NLMSG_DATA(nlh); |
| 1195 | |
| 1196 | nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
| 1197 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
| 1198 | nfmsg->version = NFNETLINK_V0; |
| 1199 | nfmsg->res_id = 0; |
| 1200 | |
| 1201 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
| 1202 | goto nfattr_failure; |
| 1203 | |
| 1204 | nlh->nlmsg_len = skb->tail - b; |
| 1205 | return skb->len; |
| 1206 | |
| 1207 | nlmsg_failure: |
| 1208 | nfattr_failure: |
| 1209 | skb_trim(skb, b - skb->data); |
| 1210 | return -1; |
| 1211 | } |
| 1212 | |
| 1213 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1214 | static int ctnetlink_expect_event(struct notifier_block *this, |
| 1215 | unsigned long events, void *ptr) |
| 1216 | { |
| 1217 | struct nlmsghdr *nlh; |
| 1218 | struct nfgenmsg *nfmsg; |
| 1219 | struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr; |
| 1220 | struct sk_buff *skb; |
| 1221 | unsigned int type; |
| 1222 | unsigned char *b; |
| 1223 | int flags = 0; |
| 1224 | |
| 1225 | if (events & IPEXP_NEW) { |
| 1226 | type = IPCTNL_MSG_EXP_NEW; |
| 1227 | flags = NLM_F_CREATE|NLM_F_EXCL; |
| 1228 | } else |
| 1229 | return NOTIFY_DONE; |
| 1230 | |
| 1231 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 1232 | if (!skb) |
| 1233 | return NOTIFY_DONE; |
| 1234 | |
| 1235 | b = skb->tail; |
| 1236 | |
Marcus Sundberg | b633ad5 | 2006-02-04 02:11:09 -0800 | [diff] [blame] | 1237 | type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1238 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| 1239 | nfmsg = NLMSG_DATA(nlh); |
| 1240 | |
| 1241 | nlh->nlmsg_flags = flags; |
| 1242 | nfmsg->nfgen_family = exp->tuple.src.l3num; |
| 1243 | nfmsg->version = NFNETLINK_V0; |
| 1244 | nfmsg->res_id = 0; |
| 1245 | |
| 1246 | if (ctnetlink_exp_dump_expect(skb, exp) < 0) |
| 1247 | goto nfattr_failure; |
| 1248 | |
| 1249 | nlh->nlmsg_len = skb->tail - b; |
| 1250 | nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0); |
| 1251 | return NOTIFY_DONE; |
| 1252 | |
| 1253 | nlmsg_failure: |
| 1254 | nfattr_failure: |
| 1255 | kfree_skb(skb); |
| 1256 | return NOTIFY_DONE; |
| 1257 | } |
| 1258 | #endif |
| 1259 | |
| 1260 | static int |
| 1261 | ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| 1262 | { |
| 1263 | struct nf_conntrack_expect *exp = NULL; |
| 1264 | struct list_head *i; |
| 1265 | u_int32_t *id = (u_int32_t *) &cb->args[0]; |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 1266 | struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| 1267 | u_int8_t l3proto = nfmsg->nfgen_family; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1268 | |
| 1269 | DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id); |
| 1270 | |
| 1271 | read_lock_bh(&nf_conntrack_lock); |
| 1272 | list_for_each_prev(i, &nf_conntrack_expect_list) { |
| 1273 | exp = (struct nf_conntrack_expect *) i; |
Pablo Neira Ayuso | 87711cb | 2006-01-05 12:19:23 -0800 | [diff] [blame] | 1274 | if (l3proto && exp->tuple.src.l3num != l3proto) |
| 1275 | continue; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1276 | if (exp->id <= *id) |
| 1277 | continue; |
| 1278 | if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| 1279 | cb->nlh->nlmsg_seq, |
| 1280 | IPCTNL_MSG_EXP_NEW, |
| 1281 | 1, exp) < 0) |
| 1282 | goto out; |
| 1283 | *id = exp->id; |
| 1284 | } |
| 1285 | out: |
| 1286 | read_unlock_bh(&nf_conntrack_lock); |
| 1287 | |
| 1288 | DEBUGP("leaving, last id=%llu\n", *id); |
| 1289 | |
| 1290 | return skb->len; |
| 1291 | } |
| 1292 | |
| 1293 | static const size_t cta_min_exp[CTA_EXPECT_MAX] = { |
| 1294 | [CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t), |
| 1295 | [CTA_EXPECT_ID-1] = sizeof(u_int32_t) |
| 1296 | }; |
| 1297 | |
| 1298 | static int |
| 1299 | ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, |
| 1300 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1301 | { |
| 1302 | struct nf_conntrack_tuple tuple; |
| 1303 | struct nf_conntrack_expect *exp; |
| 1304 | struct sk_buff *skb2; |
| 1305 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1306 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1307 | int err = 0; |
| 1308 | |
| 1309 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1310 | |
| 1311 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1312 | return -EINVAL; |
| 1313 | |
| 1314 | if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| 1315 | u32 rlen; |
| 1316 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1317 | if ((*errp = netlink_dump_start(ctnl, skb, nlh, |
| 1318 | ctnetlink_exp_dump_table, |
| 1319 | ctnetlink_done)) != 0) |
| 1320 | return -EINVAL; |
| 1321 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| 1322 | if (rlen > skb->len) |
| 1323 | rlen = skb->len; |
| 1324 | skb_pull(skb, rlen); |
| 1325 | return 0; |
| 1326 | } |
| 1327 | |
| 1328 | if (cda[CTA_EXPECT_MASTER-1]) |
| 1329 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); |
| 1330 | else |
| 1331 | return -EINVAL; |
| 1332 | |
| 1333 | if (err < 0) |
| 1334 | return err; |
| 1335 | |
| 1336 | exp = nf_conntrack_expect_find(&tuple); |
| 1337 | if (!exp) |
| 1338 | return -ENOENT; |
| 1339 | |
| 1340 | if (cda[CTA_EXPECT_ID-1]) { |
| 1341 | u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
| 1342 | if (exp->id != ntohl(id)) { |
| 1343 | nf_conntrack_expect_put(exp); |
| 1344 | return -ENOENT; |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | err = -ENOMEM; |
| 1349 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1350 | if (!skb2) |
| 1351 | goto out; |
| 1352 | NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid; |
| 1353 | |
| 1354 | err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, |
| 1355 | nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, |
| 1356 | 1, exp); |
| 1357 | if (err <= 0) |
| 1358 | goto free; |
| 1359 | |
| 1360 | nf_conntrack_expect_put(exp); |
| 1361 | |
| 1362 | return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| 1363 | |
| 1364 | free: |
| 1365 | kfree_skb(skb2); |
| 1366 | out: |
| 1367 | nf_conntrack_expect_put(exp); |
| 1368 | return err; |
| 1369 | } |
| 1370 | |
| 1371 | static int |
| 1372 | ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, |
| 1373 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1374 | { |
| 1375 | struct nf_conntrack_expect *exp, *tmp; |
| 1376 | struct nf_conntrack_tuple tuple; |
| 1377 | struct nf_conntrack_helper *h; |
| 1378 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1379 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1380 | int err; |
| 1381 | |
| 1382 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1383 | return -EINVAL; |
| 1384 | |
| 1385 | if (cda[CTA_EXPECT_TUPLE-1]) { |
| 1386 | /* delete a single expect by tuple */ |
| 1387 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1388 | if (err < 0) |
| 1389 | return err; |
| 1390 | |
| 1391 | /* bump usage count to 2 */ |
| 1392 | exp = nf_conntrack_expect_find(&tuple); |
| 1393 | if (!exp) |
| 1394 | return -ENOENT; |
| 1395 | |
| 1396 | if (cda[CTA_EXPECT_ID-1]) { |
| 1397 | u_int32_t id = |
| 1398 | *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]); |
| 1399 | if (exp->id != ntohl(id)) { |
| 1400 | nf_conntrack_expect_put(exp); |
| 1401 | return -ENOENT; |
| 1402 | } |
| 1403 | } |
| 1404 | |
| 1405 | /* after list removal, usage count == 1 */ |
| 1406 | nf_conntrack_unexpect_related(exp); |
| 1407 | /* have to put what we 'get' above. |
| 1408 | * after this line usage count == 0 */ |
| 1409 | nf_conntrack_expect_put(exp); |
| 1410 | } else if (cda[CTA_EXPECT_HELP_NAME-1]) { |
| 1411 | char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]); |
| 1412 | |
| 1413 | /* delete all expectations for this helper */ |
| 1414 | write_lock_bh(&nf_conntrack_lock); |
| 1415 | h = __nf_conntrack_helper_find_byname(name); |
| 1416 | if (!h) { |
| 1417 | write_unlock_bh(&nf_conntrack_lock); |
| 1418 | return -EINVAL; |
| 1419 | } |
| 1420 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, |
| 1421 | list) { |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 1422 | struct nf_conn_help *m_help = nfct_help(exp->master); |
| 1423 | if (m_help->helper == h |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1424 | && del_timer(&exp->timeout)) { |
| 1425 | nf_ct_unlink_expect(exp); |
| 1426 | nf_conntrack_expect_put(exp); |
| 1427 | } |
| 1428 | } |
| 1429 | write_unlock_bh(&nf_conntrack_lock); |
| 1430 | } else { |
| 1431 | /* This basically means we have to flush everything*/ |
| 1432 | write_lock_bh(&nf_conntrack_lock); |
| 1433 | list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list, |
| 1434 | list) { |
| 1435 | if (del_timer(&exp->timeout)) { |
| 1436 | nf_ct_unlink_expect(exp); |
| 1437 | nf_conntrack_expect_put(exp); |
| 1438 | } |
| 1439 | } |
| 1440 | write_unlock_bh(&nf_conntrack_lock); |
| 1441 | } |
| 1442 | |
| 1443 | return 0; |
| 1444 | } |
| 1445 | static int |
| 1446 | ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[]) |
| 1447 | { |
| 1448 | return -EOPNOTSUPP; |
| 1449 | } |
| 1450 | |
| 1451 | static int |
| 1452 | ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3) |
| 1453 | { |
| 1454 | struct nf_conntrack_tuple tuple, mask, master_tuple; |
| 1455 | struct nf_conntrack_tuple_hash *h = NULL; |
| 1456 | struct nf_conntrack_expect *exp; |
| 1457 | struct nf_conn *ct; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 1458 | struct nf_conn_help *help; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1459 | int err = 0; |
| 1460 | |
| 1461 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1462 | |
| 1463 | /* caller guarantees that those three CTA_EXPECT_* exist */ |
| 1464 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1465 | if (err < 0) |
| 1466 | return err; |
| 1467 | err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); |
| 1468 | if (err < 0) |
| 1469 | return err; |
| 1470 | err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); |
| 1471 | if (err < 0) |
| 1472 | return err; |
| 1473 | |
| 1474 | /* Look for master conntrack of this expectation */ |
| 1475 | h = nf_conntrack_find_get(&master_tuple, NULL); |
| 1476 | if (!h) |
| 1477 | return -ENOENT; |
| 1478 | ct = nf_ct_tuplehash_to_ctrack(h); |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 1479 | help = nfct_help(ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1480 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame^] | 1481 | if (!help || !help->helper) { |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1482 | /* such conntrack hasn't got any helper, abort */ |
| 1483 | err = -EINVAL; |
| 1484 | goto out; |
| 1485 | } |
| 1486 | |
| 1487 | exp = nf_conntrack_expect_alloc(ct); |
| 1488 | if (!exp) { |
| 1489 | err = -ENOMEM; |
| 1490 | goto out; |
| 1491 | } |
| 1492 | |
| 1493 | exp->expectfn = NULL; |
| 1494 | exp->flags = 0; |
| 1495 | exp->master = ct; |
| 1496 | memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); |
| 1497 | memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple)); |
| 1498 | |
| 1499 | err = nf_conntrack_expect_related(exp); |
| 1500 | nf_conntrack_expect_put(exp); |
| 1501 | |
| 1502 | out: |
| 1503 | nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); |
| 1504 | return err; |
| 1505 | } |
| 1506 | |
| 1507 | static int |
| 1508 | ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, |
| 1509 | struct nlmsghdr *nlh, struct nfattr *cda[], int *errp) |
| 1510 | { |
| 1511 | struct nf_conntrack_tuple tuple; |
| 1512 | struct nf_conntrack_expect *exp; |
| 1513 | struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| 1514 | u_int8_t u3 = nfmsg->nfgen_family; |
| 1515 | int err = 0; |
| 1516 | |
| 1517 | DEBUGP("entered %s\n", __FUNCTION__); |
| 1518 | |
| 1519 | if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp)) |
| 1520 | return -EINVAL; |
| 1521 | |
| 1522 | if (!cda[CTA_EXPECT_TUPLE-1] |
| 1523 | || !cda[CTA_EXPECT_MASK-1] |
| 1524 | || !cda[CTA_EXPECT_MASTER-1]) |
| 1525 | return -EINVAL; |
| 1526 | |
| 1527 | err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| 1528 | if (err < 0) |
| 1529 | return err; |
| 1530 | |
| 1531 | write_lock_bh(&nf_conntrack_lock); |
| 1532 | exp = __nf_conntrack_expect_find(&tuple); |
| 1533 | |
| 1534 | if (!exp) { |
| 1535 | write_unlock_bh(&nf_conntrack_lock); |
| 1536 | err = -ENOENT; |
| 1537 | if (nlh->nlmsg_flags & NLM_F_CREATE) |
| 1538 | err = ctnetlink_create_expect(cda, u3); |
| 1539 | return err; |
| 1540 | } |
| 1541 | |
| 1542 | err = -EEXIST; |
| 1543 | if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
| 1544 | err = ctnetlink_change_expect(exp, cda); |
| 1545 | write_unlock_bh(&nf_conntrack_lock); |
| 1546 | |
| 1547 | DEBUGP("leaving\n"); |
| 1548 | |
| 1549 | return err; |
| 1550 | } |
| 1551 | |
| 1552 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1553 | static struct notifier_block ctnl_notifier = { |
| 1554 | .notifier_call = ctnetlink_conntrack_event, |
| 1555 | }; |
| 1556 | |
| 1557 | static struct notifier_block ctnl_notifier_exp = { |
| 1558 | .notifier_call = ctnetlink_expect_event, |
| 1559 | }; |
| 1560 | #endif |
| 1561 | |
| 1562 | static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = { |
| 1563 | [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack, |
| 1564 | .attr_count = CTA_MAX, }, |
| 1565 | [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack, |
| 1566 | .attr_count = CTA_MAX, }, |
| 1567 | [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack, |
| 1568 | .attr_count = CTA_MAX, }, |
| 1569 | [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack, |
| 1570 | .attr_count = CTA_MAX, }, |
| 1571 | }; |
| 1572 | |
| 1573 | static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = { |
| 1574 | [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect, |
| 1575 | .attr_count = CTA_EXPECT_MAX, }, |
| 1576 | [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect, |
| 1577 | .attr_count = CTA_EXPECT_MAX, }, |
| 1578 | [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect, |
| 1579 | .attr_count = CTA_EXPECT_MAX, }, |
| 1580 | }; |
| 1581 | |
| 1582 | static struct nfnetlink_subsystem ctnl_subsys = { |
| 1583 | .name = "conntrack", |
| 1584 | .subsys_id = NFNL_SUBSYS_CTNETLINK, |
| 1585 | .cb_count = IPCTNL_MSG_MAX, |
| 1586 | .cb = ctnl_cb, |
| 1587 | }; |
| 1588 | |
| 1589 | static struct nfnetlink_subsystem ctnl_exp_subsys = { |
| 1590 | .name = "conntrack_expect", |
| 1591 | .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP, |
| 1592 | .cb_count = IPCTNL_MSG_EXP_MAX, |
| 1593 | .cb = ctnl_exp_cb, |
| 1594 | }; |
| 1595 | |
| 1596 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK); |
Pablo Neira Ayuso | 34f9a2e | 2006-02-04 02:11:41 -0800 | [diff] [blame] | 1597 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1598 | |
| 1599 | static int __init ctnetlink_init(void) |
| 1600 | { |
| 1601 | int ret; |
| 1602 | |
| 1603 | printk("ctnetlink v%s: registering with nfnetlink.\n", version); |
| 1604 | ret = nfnetlink_subsys_register(&ctnl_subsys); |
| 1605 | if (ret < 0) { |
| 1606 | printk("ctnetlink_init: cannot register with nfnetlink.\n"); |
| 1607 | goto err_out; |
| 1608 | } |
| 1609 | |
| 1610 | ret = nfnetlink_subsys_register(&ctnl_exp_subsys); |
| 1611 | if (ret < 0) { |
| 1612 | printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); |
| 1613 | goto err_unreg_subsys; |
| 1614 | } |
| 1615 | |
| 1616 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1617 | ret = nf_conntrack_register_notifier(&ctnl_notifier); |
| 1618 | if (ret < 0) { |
| 1619 | printk("ctnetlink_init: cannot register notifier.\n"); |
| 1620 | goto err_unreg_exp_subsys; |
| 1621 | } |
| 1622 | |
| 1623 | ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp); |
| 1624 | if (ret < 0) { |
| 1625 | printk("ctnetlink_init: cannot expect register notifier.\n"); |
| 1626 | goto err_unreg_notifier; |
| 1627 | } |
| 1628 | #endif |
| 1629 | |
| 1630 | return 0; |
| 1631 | |
| 1632 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1633 | err_unreg_notifier: |
| 1634 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
| 1635 | err_unreg_exp_subsys: |
| 1636 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| 1637 | #endif |
| 1638 | err_unreg_subsys: |
| 1639 | nfnetlink_subsys_unregister(&ctnl_subsys); |
| 1640 | err_out: |
| 1641 | return ret; |
| 1642 | } |
| 1643 | |
| 1644 | static void __exit ctnetlink_exit(void) |
| 1645 | { |
| 1646 | printk("ctnetlink: unregistering from nfnetlink.\n"); |
| 1647 | |
| 1648 | #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| 1649 | nf_conntrack_unregister_notifier(&ctnl_notifier_exp); |
| 1650 | nf_conntrack_unregister_notifier(&ctnl_notifier); |
| 1651 | #endif |
| 1652 | |
| 1653 | nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| 1654 | nfnetlink_subsys_unregister(&ctnl_subsys); |
| 1655 | return; |
| 1656 | } |
| 1657 | |
| 1658 | module_init(ctnetlink_init); |
| 1659 | module_exit(ctnetlink_exit); |