1 /* Cluster IP hashmark target 2 * (C) 2003-2004 by Harald Welte <laforge@netfilter.org> 3 * based on ideas of Fabio Olive Leite <olive@unixforge.org> 4 * 5 * Development of this code funded by SuSE Linux AG, http://www.suse.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 */ 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 #include <linux/module.h> 14 #include <linux/proc_fs.h> 15 #include <linux/jhash.h> 16 #include <linux/bitops.h> 17 #include <linux/skbuff.h> 18 #include <linux/slab.h> 19 #include <linux/ip.h> 20 #include <linux/tcp.h> 21 #include <linux/udp.h> 22 #include <linux/icmp.h> 23 #include <linux/if_arp.h> 24 #include <linux/seq_file.h> 25 #include <linux/netfilter_arp.h> 26 #include <linux/netfilter/x_tables.h> 27 #include <linux/netfilter_ipv4/ip_tables.h> 28 #include <linux/netfilter_ipv4/ipt_CLUSTERIP.h> 29 #include <net/netfilter/nf_conntrack.h> 30 #include <net/net_namespace.h> 31 #include <net/checksum.h> 32 #include <net/ip.h> 33 34 #define CLUSTERIP_VERSION "0.8" 35 36 MODULE_LICENSE("GPL"); 37 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); 38 MODULE_DESCRIPTION("Xtables: CLUSTERIP target"); 39 40 struct clusterip_config { 41 struct list_head list; /* list of all configs */ 42 atomic_t refcount; /* reference count */ 43 atomic_t entries; /* number of entries/rules 44 * referencing us */ 45 46 __be32 clusterip; /* the IP address */ 47 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */ 48 struct net_device *dev; /* device */ 49 u_int16_t num_total_nodes; /* total number of nodes */ 50 unsigned long local_nodes; /* node number array */ 51 52 #ifdef CONFIG_PROC_FS 53 struct proc_dir_entry *pde; /* proc dir entry */ 54 #endif 55 enum clusterip_hashmode hash_mode; /* which hashing mode */ 56 u_int32_t hash_initval; /* hash initialization */ 57 struct rcu_head rcu; 58 }; 59 60 static LIST_HEAD(clusterip_configs); 61 62 /* clusterip_lock protects the clusterip_configs list */ 63 static DEFINE_SPINLOCK(clusterip_lock); 64 65 #ifdef CONFIG_PROC_FS 66 static const struct file_operations clusterip_proc_fops; 67 static struct proc_dir_entry *clusterip_procdir; 68 #endif 69 70 static inline void 71 clusterip_config_get(struct clusterip_config *c) 72 { 73 atomic_inc(&c->refcount); 74 } 75 76 77 static void clusterip_config_rcu_free(struct rcu_head *head) 78 { 79 kfree(container_of(head, struct clusterip_config, rcu)); 80 } 81 82 static inline void 83 clusterip_config_put(struct clusterip_config *c) 84 { 85 if (atomic_dec_and_test(&c->refcount)) 86 call_rcu_bh(&c->rcu, clusterip_config_rcu_free); 87 } 88 89 /* decrease the count of entries using/referencing this config. If last 90 * entry(rule) is removed, remove the config from lists, but don't free it 91 * yet, since proc-files could still be holding references */ 92 static inline void 93 clusterip_config_entry_put(struct clusterip_config *c) 94 { 95 local_bh_disable(); 96 if (atomic_dec_and_lock(&c->entries, &clusterip_lock)) { 97 list_del_rcu(&c->list); 98 spin_unlock(&clusterip_lock); 99 local_bh_enable(); 100 101 dev_mc_del(c->dev, c->clustermac); 102 dev_put(c->dev); 103 104 /* In case anyone still accesses the file, the open/close 105 * functions are also incrementing the refcount on their own, 106 * so it's safe to remove the entry even if it's in use. */ 107 #ifdef CONFIG_PROC_FS 108 proc_remove(c->pde); 109 #endif 110 return; 111 } 112 local_bh_enable(); 113 } 114 115 static struct clusterip_config * 116 __clusterip_config_find(__be32 clusterip) 117 { 118 struct clusterip_config *c; 119 120 list_for_each_entry_rcu(c, &clusterip_configs, list) { 121 if (c->clusterip == clusterip) 122 return c; 123 } 124 125 return NULL; 126 } 127 128 static inline struct clusterip_config * 129 clusterip_config_find_get(__be32 clusterip, int entry) 130 { 131 struct clusterip_config *c; 132 133 rcu_read_lock_bh(); 134 c = __clusterip_config_find(clusterip); 135 if (c) { 136 if (unlikely(!atomic_inc_not_zero(&c->refcount))) 137 c = NULL; 138 else if (entry) 139 atomic_inc(&c->entries); 140 } 141 rcu_read_unlock_bh(); 142 143 return c; 144 } 145 146 static void 147 clusterip_config_init_nodelist(struct clusterip_config *c, 148 const struct ipt_clusterip_tgt_info *i) 149 { 150 int n; 151 152 for (n = 0; n < i->num_local_nodes; n++) 153 set_bit(i->local_nodes[n] - 1, &c->local_nodes); 154 } 155 156 static struct clusterip_config * 157 clusterip_config_init(const struct ipt_clusterip_tgt_info *i, __be32 ip, 158 struct net_device *dev) 159 { 160 struct clusterip_config *c; 161 162 c = kzalloc(sizeof(*c), GFP_ATOMIC); 163 if (!c) 164 return NULL; 165 166 c->dev = dev; 167 c->clusterip = ip; 168 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN); 169 c->num_total_nodes = i->num_total_nodes; 170 clusterip_config_init_nodelist(c, i); 171 c->hash_mode = i->hash_mode; 172 c->hash_initval = i->hash_initval; 173 atomic_set(&c->refcount, 1); 174 atomic_set(&c->entries, 1); 175 176 #ifdef CONFIG_PROC_FS 177 { 178 char buffer[16]; 179 180 /* create proc dir entry */ 181 sprintf(buffer, "%pI4", &ip); 182 c->pde = proc_create_data(buffer, S_IWUSR|S_IRUSR, 183 clusterip_procdir, 184 &clusterip_proc_fops, c); 185 if (!c->pde) { 186 kfree(c); 187 return NULL; 188 } 189 } 190 #endif 191 192 spin_lock_bh(&clusterip_lock); 193 list_add_rcu(&c->list, &clusterip_configs); 194 spin_unlock_bh(&clusterip_lock); 195 196 return c; 197 } 198 199 #ifdef CONFIG_PROC_FS 200 static int 201 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum) 202 { 203 204 if (nodenum == 0 || 205 nodenum > c->num_total_nodes) 206 return 1; 207 208 /* check if we already have this number in our bitfield */ 209 if (test_and_set_bit(nodenum - 1, &c->local_nodes)) 210 return 1; 211 212 return 0; 213 } 214 215 static bool 216 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum) 217 { 218 if (nodenum == 0 || 219 nodenum > c->num_total_nodes) 220 return true; 221 222 if (test_and_clear_bit(nodenum - 1, &c->local_nodes)) 223 return false; 224 225 return true; 226 } 227 #endif 228 229 static inline u_int32_t 230 clusterip_hashfn(const struct sk_buff *skb, 231 const struct clusterip_config *config) 232 { 233 const struct iphdr *iph = ip_hdr(skb); 234 unsigned long hashval; 235 u_int16_t sport = 0, dport = 0; 236 int poff; 237 238 poff = proto_ports_offset(iph->protocol); 239 if (poff >= 0) { 240 const u_int16_t *ports; 241 u16 _ports[2]; 242 243 ports = skb_header_pointer(skb, iph->ihl * 4 + poff, 4, _ports); 244 if (ports) { 245 sport = ports[0]; 246 dport = ports[1]; 247 } 248 } else { 249 net_info_ratelimited("unknown protocol %u\n", iph->protocol); 250 } 251 252 switch (config->hash_mode) { 253 case CLUSTERIP_HASHMODE_SIP: 254 hashval = jhash_1word(ntohl(iph->saddr), 255 config->hash_initval); 256 break; 257 case CLUSTERIP_HASHMODE_SIP_SPT: 258 hashval = jhash_2words(ntohl(iph->saddr), sport, 259 config->hash_initval); 260 break; 261 case CLUSTERIP_HASHMODE_SIP_SPT_DPT: 262 hashval = jhash_3words(ntohl(iph->saddr), sport, dport, 263 config->hash_initval); 264 break; 265 default: 266 /* to make gcc happy */ 267 hashval = 0; 268 /* This cannot happen, unless the check function wasn't called 269 * at rule load time */ 270 pr_info("unknown mode %u\n", config->hash_mode); 271 BUG(); 272 break; 273 } 274 275 /* node numbers are 1..n, not 0..n */ 276 return (((u64)hashval * config->num_total_nodes) >> 32) + 1; 277 } 278 279 static inline int 280 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash) 281 { 282 return test_bit(hash - 1, &config->local_nodes); 283 } 284 285 /*********************************************************************** 286 * IPTABLES TARGET 287 ***********************************************************************/ 288 289 static unsigned int 290 clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par) 291 { 292 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo; 293 struct nf_conn *ct; 294 enum ip_conntrack_info ctinfo; 295 u_int32_t hash; 296 297 /* don't need to clusterip_config_get() here, since refcount 298 * is only decremented by destroy() - and ip_tables guarantees 299 * that the ->target() function isn't called after ->destroy() */ 300 301 ct = nf_ct_get(skb, &ctinfo); 302 if (ct == NULL) 303 return NF_DROP; 304 305 /* special case: ICMP error handling. conntrack distinguishes between 306 * error messages (RELATED) and information requests (see below) */ 307 if (ip_hdr(skb)->protocol == IPPROTO_ICMP && 308 (ctinfo == IP_CT_RELATED || 309 ctinfo == IP_CT_RELATED_REPLY)) 310 return XT_CONTINUE; 311 312 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO, 313 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here 314 * on, which all have an ID field [relevant for hashing]. */ 315 316 hash = clusterip_hashfn(skb, cipinfo->config); 317 318 switch (ctinfo) { 319 case IP_CT_NEW: 320 ct->mark = hash; 321 break; 322 case IP_CT_RELATED: 323 case IP_CT_RELATED_REPLY: 324 /* FIXME: we don't handle expectations at the moment. 325 * They can arrive on a different node than 326 * the master connection (e.g. FTP passive mode) */ 327 case IP_CT_ESTABLISHED: 328 case IP_CT_ESTABLISHED_REPLY: 329 break; 330 default: /* Prevent gcc warnings */ 331 break; 332 } 333 334 #ifdef DEBUG 335 nf_ct_dump_tuple_ip(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); 336 #endif 337 pr_debug("hash=%u ct_hash=%u ", hash, ct->mark); 338 if (!clusterip_responsible(cipinfo->config, hash)) { 339 pr_debug("not responsible\n"); 340 return NF_DROP; 341 } 342 pr_debug("responsible\n"); 343 344 /* despite being received via linklayer multicast, this is 345 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */ 346 skb->pkt_type = PACKET_HOST; 347 348 return XT_CONTINUE; 349 } 350 351 static int clusterip_tg_check(const struct xt_tgchk_param *par) 352 { 353 struct ipt_clusterip_tgt_info *cipinfo = par->targinfo; 354 const struct ipt_entry *e = par->entryinfo; 355 struct clusterip_config *config; 356 int ret; 357 358 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP && 359 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT && 360 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) { 361 pr_info("unknown mode %u\n", cipinfo->hash_mode); 362 return -EINVAL; 363 364 } 365 if (e->ip.dmsk.s_addr != htonl(0xffffffff) || 366 e->ip.dst.s_addr == 0) { 367 pr_info("Please specify destination IP\n"); 368 return -EINVAL; 369 } 370 371 /* FIXME: further sanity checks */ 372 373 config = clusterip_config_find_get(e->ip.dst.s_addr, 1); 374 if (!config) { 375 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) { 376 pr_info("no config found for %pI4, need 'new'\n", 377 &e->ip.dst.s_addr); 378 return -EINVAL; 379 } else { 380 struct net_device *dev; 381 382 if (e->ip.iniface[0] == '\0') { 383 pr_info("Please specify an interface name\n"); 384 return -EINVAL; 385 } 386 387 dev = dev_get_by_name(&init_net, e->ip.iniface); 388 if (!dev) { 389 pr_info("no such interface %s\n", 390 e->ip.iniface); 391 return -ENOENT; 392 } 393 394 config = clusterip_config_init(cipinfo, 395 e->ip.dst.s_addr, dev); 396 if (!config) { 397 dev_put(dev); 398 return -ENOMEM; 399 } 400 dev_mc_add(config->dev, config->clustermac); 401 } 402 } 403 cipinfo->config = config; 404 405 ret = nf_ct_l3proto_try_module_get(par->family); 406 if (ret < 0) 407 pr_info("cannot load conntrack support for proto=%u\n", 408 par->family); 409 return ret; 410 } 411 412 /* drop reference count of cluster config when rule is deleted */ 413 static void clusterip_tg_destroy(const struct xt_tgdtor_param *par) 414 { 415 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo; 416 417 /* if no more entries are referencing the config, remove it 418 * from the list and destroy the proc entry */ 419 clusterip_config_entry_put(cipinfo->config); 420 421 clusterip_config_put(cipinfo->config); 422 423 nf_ct_l3proto_module_put(par->family); 424 } 425 426 #ifdef CONFIG_COMPAT 427 struct compat_ipt_clusterip_tgt_info 428 { 429 u_int32_t flags; 430 u_int8_t clustermac[6]; 431 u_int16_t num_total_nodes; 432 u_int16_t num_local_nodes; 433 u_int16_t local_nodes[CLUSTERIP_MAX_NODES]; 434 u_int32_t hash_mode; 435 u_int32_t hash_initval; 436 compat_uptr_t config; 437 }; 438 #endif /* CONFIG_COMPAT */ 439 440 static struct xt_target clusterip_tg_reg __read_mostly = { 441 .name = "CLUSTERIP", 442 .family = NFPROTO_IPV4, 443 .target = clusterip_tg, 444 .checkentry = clusterip_tg_check, 445 .destroy = clusterip_tg_destroy, 446 .targetsize = sizeof(struct ipt_clusterip_tgt_info), 447 #ifdef CONFIG_COMPAT 448 .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info), 449 #endif /* CONFIG_COMPAT */ 450 .me = THIS_MODULE 451 }; 452 453 454 /*********************************************************************** 455 * ARP MANGLING CODE 456 ***********************************************************************/ 457 458 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */ 459 struct arp_payload { 460 u_int8_t src_hw[ETH_ALEN]; 461 __be32 src_ip; 462 u_int8_t dst_hw[ETH_ALEN]; 463 __be32 dst_ip; 464 } __packed; 465 466 #ifdef DEBUG 467 static void arp_print(struct arp_payload *payload) 468 { 469 #define HBUFFERLEN 30 470 char hbuffer[HBUFFERLEN]; 471 int j,k; 472 473 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) { 474 hbuffer[k++] = hex_asc_hi(payload->src_hw[j]); 475 hbuffer[k++] = hex_asc_lo(payload->src_hw[j]); 476 hbuffer[k++]=':'; 477 } 478 hbuffer[--k]='\0'; 479 480 pr_debug("src %pI4@%s, dst %pI4\n", 481 &payload->src_ip, hbuffer, &payload->dst_ip); 482 } 483 #endif 484 485 static unsigned int 486 arp_mangle(unsigned int hook, 487 struct sk_buff *skb, 488 const struct net_device *in, 489 const struct net_device *out, 490 int (*okfn)(struct sk_buff *)) 491 { 492 struct arphdr *arp = arp_hdr(skb); 493 struct arp_payload *payload; 494 struct clusterip_config *c; 495 496 /* we don't care about non-ethernet and non-ipv4 ARP */ 497 if (arp->ar_hrd != htons(ARPHRD_ETHER) || 498 arp->ar_pro != htons(ETH_P_IP) || 499 arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN) 500 return NF_ACCEPT; 501 502 /* we only want to mangle arp requests and replies */ 503 if (arp->ar_op != htons(ARPOP_REPLY) && 504 arp->ar_op != htons(ARPOP_REQUEST)) 505 return NF_ACCEPT; 506 507 payload = (void *)(arp+1); 508 509 /* if there is no clusterip configuration for the arp reply's 510 * source ip, we don't want to mangle it */ 511 c = clusterip_config_find_get(payload->src_ip, 0); 512 if (!c) 513 return NF_ACCEPT; 514 515 /* normally the linux kernel always replies to arp queries of 516 * addresses on different interfacs. However, in the CLUSTERIP case 517 * this wouldn't work, since we didn't subscribe the mcast group on 518 * other interfaces */ 519 if (c->dev != out) { 520 pr_debug("not mangling arp reply on different " 521 "interface: cip'%s'-skb'%s'\n", 522 c->dev->name, out->name); 523 clusterip_config_put(c); 524 return NF_ACCEPT; 525 } 526 527 /* mangle reply hardware address */ 528 memcpy(payload->src_hw, c->clustermac, arp->ar_hln); 529 530 #ifdef DEBUG 531 pr_debug("mangled arp reply: "); 532 arp_print(payload); 533 #endif 534 535 clusterip_config_put(c); 536 537 return NF_ACCEPT; 538 } 539 540 static struct nf_hook_ops cip_arp_ops __read_mostly = { 541 .hook = arp_mangle, 542 .pf = NFPROTO_ARP, 543 .hooknum = NF_ARP_OUT, 544 .priority = -1 545 }; 546 547 /*********************************************************************** 548 * PROC DIR HANDLING 549 ***********************************************************************/ 550 551 #ifdef CONFIG_PROC_FS 552 553 struct clusterip_seq_position { 554 unsigned int pos; /* position */ 555 unsigned int weight; /* number of bits set == size */ 556 unsigned int bit; /* current bit */ 557 unsigned long val; /* current value */ 558 }; 559 560 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos) 561 { 562 struct clusterip_config *c = s->private; 563 unsigned int weight; 564 u_int32_t local_nodes; 565 struct clusterip_seq_position *idx; 566 567 /* FIXME: possible race */ 568 local_nodes = c->local_nodes; 569 weight = hweight32(local_nodes); 570 if (*pos >= weight) 571 return NULL; 572 573 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL); 574 if (!idx) 575 return ERR_PTR(-ENOMEM); 576 577 idx->pos = *pos; 578 idx->weight = weight; 579 idx->bit = ffs(local_nodes); 580 idx->val = local_nodes; 581 clear_bit(idx->bit - 1, &idx->val); 582 583 return idx; 584 } 585 586 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos) 587 { 588 struct clusterip_seq_position *idx = v; 589 590 *pos = ++idx->pos; 591 if (*pos >= idx->weight) { 592 kfree(v); 593 return NULL; 594 } 595 idx->bit = ffs(idx->val); 596 clear_bit(idx->bit - 1, &idx->val); 597 return idx; 598 } 599 600 static void clusterip_seq_stop(struct seq_file *s, void *v) 601 { 602 if (!IS_ERR(v)) 603 kfree(v); 604 } 605 606 static int clusterip_seq_show(struct seq_file *s, void *v) 607 { 608 struct clusterip_seq_position *idx = v; 609 610 if (idx->pos != 0) 611 seq_putc(s, ','); 612 613 seq_printf(s, "%u", idx->bit); 614 615 if (idx->pos == idx->weight - 1) 616 seq_putc(s, '\n'); 617 618 return 0; 619 } 620 621 static const struct seq_operations clusterip_seq_ops = { 622 .start = clusterip_seq_start, 623 .next = clusterip_seq_next, 624 .stop = clusterip_seq_stop, 625 .show = clusterip_seq_show, 626 }; 627 628 static int clusterip_proc_open(struct inode *inode, struct file *file) 629 { 630 int ret = seq_open(file, &clusterip_seq_ops); 631 632 if (!ret) { 633 struct seq_file *sf = file->private_data; 634 struct clusterip_config *c = PDE_DATA(inode); 635 636 sf->private = c; 637 638 clusterip_config_get(c); 639 } 640 641 return ret; 642 } 643 644 static int clusterip_proc_release(struct inode *inode, struct file *file) 645 { 646 struct clusterip_config *c = PDE_DATA(inode); 647 int ret; 648 649 ret = seq_release(inode, file); 650 651 if (!ret) 652 clusterip_config_put(c); 653 654 return ret; 655 } 656 657 static ssize_t clusterip_proc_write(struct file *file, const char __user *input, 658 size_t size, loff_t *ofs) 659 { 660 struct clusterip_config *c = PDE_DATA(file_inode(file)); 661 #define PROC_WRITELEN 10 662 char buffer[PROC_WRITELEN+1]; 663 unsigned long nodenum; 664 int rc; 665 666 if (size > PROC_WRITELEN) 667 return -EIO; 668 if (copy_from_user(buffer, input, size)) 669 return -EFAULT; 670 buffer[size] = 0; 671 672 if (*buffer == '+') { 673 rc = kstrtoul(buffer+1, 10, &nodenum); 674 if (rc) 675 return rc; 676 if (clusterip_add_node(c, nodenum)) 677 return -ENOMEM; 678 } else if (*buffer == '-') { 679 rc = kstrtoul(buffer+1, 10, &nodenum); 680 if (rc) 681 return rc; 682 if (clusterip_del_node(c, nodenum)) 683 return -ENOENT; 684 } else 685 return -EIO; 686 687 return size; 688 } 689 690 static const struct file_operations clusterip_proc_fops = { 691 .owner = THIS_MODULE, 692 .open = clusterip_proc_open, 693 .read = seq_read, 694 .write = clusterip_proc_write, 695 .llseek = seq_lseek, 696 .release = clusterip_proc_release, 697 }; 698 699 #endif /* CONFIG_PROC_FS */ 700 701 static int __init clusterip_tg_init(void) 702 { 703 int ret; 704 705 ret = xt_register_target(&clusterip_tg_reg); 706 if (ret < 0) 707 return ret; 708 709 ret = nf_register_hook(&cip_arp_ops); 710 if (ret < 0) 711 goto cleanup_target; 712 713 #ifdef CONFIG_PROC_FS 714 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", init_net.proc_net); 715 if (!clusterip_procdir) { 716 pr_err("Unable to proc dir entry\n"); 717 ret = -ENOMEM; 718 goto cleanup_hook; 719 } 720 #endif /* CONFIG_PROC_FS */ 721 722 pr_info("ClusterIP Version %s loaded successfully\n", 723 CLUSTERIP_VERSION); 724 return 0; 725 726 #ifdef CONFIG_PROC_FS 727 cleanup_hook: 728 nf_unregister_hook(&cip_arp_ops); 729 #endif /* CONFIG_PROC_FS */ 730 cleanup_target: 731 xt_unregister_target(&clusterip_tg_reg); 732 return ret; 733 } 734 735 static void __exit clusterip_tg_exit(void) 736 { 737 pr_info("ClusterIP Version %s unloading\n", CLUSTERIP_VERSION); 738 #ifdef CONFIG_PROC_FS 739 proc_remove(clusterip_procdir); 740 #endif 741 nf_unregister_hook(&cip_arp_ops); 742 xt_unregister_target(&clusterip_tg_reg); 743 744 /* Wait for completion of call_rcu_bh()'s (clusterip_config_rcu_free) */ 745 rcu_barrier_bh(); 746 } 747 748 module_init(clusterip_tg_init); 749 module_exit(clusterip_tg_exit); 750
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