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