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[IPV4]: Clean up duplicate includes in net/ipv4/
[linux-2.6/openmoko-kernel/knife-kernel.git] / net / ipv4 / netfilter / ipt_CLUSTERIP.c
blob69bd362b5fa20d8c1ed42f79aed68f93a431b98f
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 #include <linux/module.h>
13 #include <linux/proc_fs.h>
14 #include <linux/jhash.h>
15 #include <linux/bitops.h>
16 #include <linux/skbuff.h>
17 #include <linux/ip.h>
18 #include <linux/tcp.h>
19 #include <linux/udp.h>
20 #include <linux/icmp.h>
21 #include <linux/if_arp.h>
22 #include <linux/seq_file.h>
23 #include <linux/netfilter_arp.h>
24 #include <linux/netfilter/x_tables.h>
25 #include <linux/netfilter_ipv4/ip_tables.h>
26 #include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/checksum.h>
29
30 #define CLUSTERIP_VERSION "0.8"
31
32 MODULE_LICENSE("GPL");
33 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
34 MODULE_DESCRIPTION("iptables target for CLUSTERIP");
35
36 struct clusterip_config {
37 struct list_head list; /* list of all configs */
38 atomic_t refcount; /* reference count */
39 atomic_t entries; /* number of entries/rules
40 * referencing us */
41
42 __be32 clusterip; /* the IP address */
43 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
44 struct net_device *dev; /* device */
45 u_int16_t num_total_nodes; /* total number of nodes */
46 unsigned long local_nodes; /* node number array */
47
48 #ifdef CONFIG_PROC_FS
49 struct proc_dir_entry *pde; /* proc dir entry */
50 #endif
51 enum clusterip_hashmode hash_mode; /* which hashing mode */
52 u_int32_t hash_initval; /* hash initialization */
53 };
54
55 static LIST_HEAD(clusterip_configs);
56
57 /* clusterip_lock protects the clusterip_configs list */
58 static DEFINE_RWLOCK(clusterip_lock);
59
60 #ifdef CONFIG_PROC_FS
61 static const struct file_operations clusterip_proc_fops;
62 static struct proc_dir_entry *clusterip_procdir;
63 #endif
64
65 static inline void
66 clusterip_config_get(struct clusterip_config *c)
67 {
68 atomic_inc(&c->refcount);
69 }
70
71 static inline void
72 clusterip_config_put(struct clusterip_config *c)
73 {
74 if (atomic_dec_and_test(&c->refcount))
75 kfree(c);
76 }
77
78 /* increase the count of entries(rules) using/referencing this config */
79 static inline void
80 clusterip_config_entry_get(struct clusterip_config *c)
81 {
82 atomic_inc(&c->entries);
83 }
84
85 /* decrease the count of entries using/referencing this config. If last
86 * entry(rule) is removed, remove the config from lists, but don't free it
87 * yet, since proc-files could still be holding references */
88 static inline void
89 clusterip_config_entry_put(struct clusterip_config *c)
90 {
91 if (atomic_dec_and_test(&c->entries)) {
92 write_lock_bh(&clusterip_lock);
93 list_del(&c->list);
94 write_unlock_bh(&clusterip_lock);
95
96 dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
97 dev_put(c->dev);
98
99 /* In case anyone still accesses the file, the open/close
100 * functions are also incrementing the refcount on their own,
101 * so it's safe to remove the entry even if it's in use. */
102 #ifdef CONFIG_PROC_FS
103 remove_proc_entry(c->pde->name, c->pde->parent);
104 #endif
105 }
106 }
107
108 static struct clusterip_config *
109 __clusterip_config_find(__be32 clusterip)
110 {
111 struct list_head *pos;
112
113 list_for_each(pos, &clusterip_configs) {
114 struct clusterip_config *c = list_entry(pos,
115 struct clusterip_config, list);
116 if (c->clusterip == clusterip)
117 return c;
118 }
119
120 return NULL;
121 }
122
123 static inline struct clusterip_config *
124 clusterip_config_find_get(__be32 clusterip, int entry)
125 {
126 struct clusterip_config *c;
127
128 read_lock_bh(&clusterip_lock);
129 c = __clusterip_config_find(clusterip);
130 if (!c) {
131 read_unlock_bh(&clusterip_lock);
132 return NULL;
133 }
134 atomic_inc(&c->refcount);
135 if (entry)
136 atomic_inc(&c->entries);
137 read_unlock_bh(&clusterip_lock);
138
139 return c;
140 }
141
142 static void
143 clusterip_config_init_nodelist(struct clusterip_config *c,
144 const struct ipt_clusterip_tgt_info *i)
145 {
146 int n;
147
148 for (n = 0; n < i->num_local_nodes; n++)
149 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
150 }
151
152 static struct clusterip_config *
153 clusterip_config_init(struct ipt_clusterip_tgt_info *i, __be32 ip,
154 struct net_device *dev)
155 {
156 struct clusterip_config *c;
157
158 c = kzalloc(sizeof(*c), GFP_ATOMIC);
159 if (!c)
160 return NULL;
161
162 c->dev = dev;
163 c->clusterip = ip;
164 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
165 c->num_total_nodes = i->num_total_nodes;
166 clusterip_config_init_nodelist(c, i);
167 c->hash_mode = i->hash_mode;
168 c->hash_initval = i->hash_initval;
169 atomic_set(&c->refcount, 1);
170 atomic_set(&c->entries, 1);
171
172 #ifdef CONFIG_PROC_FS
173 {
174 char buffer[16];
175
176 /* create proc dir entry */
177 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
178 c->pde = create_proc_entry(buffer, S_IWUSR|S_IRUSR,
179 clusterip_procdir);
180 if (!c->pde) {
181 kfree(c);
182 return NULL;
183 }
184 }
185 c->pde->proc_fops = &clusterip_proc_fops;
186 c->pde->data = c;
187 #endif
188
189 write_lock_bh(&clusterip_lock);
190 list_add(&c->list, &clusterip_configs);
191 write_unlock_bh(&clusterip_lock);
192
193 return c;
194 }
195
196 #ifdef CONFIG_PROC_FS
197 static int
198 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
199 {
200
201 if (nodenum == 0 ||
202 nodenum > c->num_total_nodes)
203 return 1;
204
205 /* check if we already have this number in our bitfield */
206 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
207 return 1;
208
209 return 0;
210 }
211
212 static bool
213 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
214 {
215 if (nodenum == 0 ||
216 nodenum > c->num_total_nodes)
217 return true;
218
219 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
220 return false;
221
222 return true;
223 }
224 #endif
225
226 static inline u_int32_t
227 clusterip_hashfn(const struct sk_buff *skb,
228 const struct clusterip_config *config)
229 {
230 const struct iphdr *iph = ip_hdr(skb);
231 unsigned long hashval;
232 u_int16_t sport, dport;
233 const u_int16_t *ports;
234
235 switch (iph->protocol) {
236 case IPPROTO_TCP:
237 case IPPROTO_UDP:
238 case IPPROTO_UDPLITE:
239 case IPPROTO_SCTP:
240 case IPPROTO_DCCP:
241 case IPPROTO_ICMP:
242 ports = (const void *)iph+iph->ihl*4;
243 sport = ports[0];
244 dport = ports[1];
245 break;
246 default:
247 if (net_ratelimit())
248 printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
249 iph->protocol);
250 sport = dport = 0;
251 }
252
253 switch (config->hash_mode) {
254 case CLUSTERIP_HASHMODE_SIP:
255 hashval = jhash_1word(ntohl(iph->saddr),
256 config->hash_initval);
257 break;
258 case CLUSTERIP_HASHMODE_SIP_SPT:
259 hashval = jhash_2words(ntohl(iph->saddr), sport,
260 config->hash_initval);
261 break;
262 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
263 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
264 config->hash_initval);
265 break;
266 default:
267 /* to make gcc happy */
268 hashval = 0;
269 /* This cannot happen, unless the check function wasn't called
270 * at rule load time */
271 printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
272 BUG();
273 break;
274 }
275
276 /* node numbers are 1..n, not 0..n */
277 return (hashval % config->num_total_nodes) + 1;
278 }
279
280 static inline int
281 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
282 {
283 return test_bit(hash - 1, &config->local_nodes);
284 }
285
286 /***********************************************************************
287 * IPTABLES TARGET
288 ***********************************************************************/
289
290 static unsigned int
291 target(struct sk_buff **pskb,
292 const struct net_device *in,
293 const struct net_device *out,
294 unsigned int hooknum,
295 const struct xt_target *target,
296 const void *targinfo)
297 {
298 const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
299 struct nf_conn *ct;
300 enum ip_conntrack_info ctinfo;
301 u_int32_t hash;
302
303 /* don't need to clusterip_config_get() here, since refcount
304 * is only decremented by destroy() - and ip_tables guarantees
305 * that the ->target() function isn't called after ->destroy() */
306
307 ct = nf_ct_get(*pskb, &ctinfo);
308 if (ct == NULL) {
309 printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
310 /* FIXME: need to drop invalid ones, since replies
311 * to outgoing connections of other nodes will be
312 * marked as INVALID */
313 return NF_DROP;
314 }
315
316 /* special case: ICMP error handling. conntrack distinguishes between
317 * error messages (RELATED) and information requests (see below) */
318 if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP
319 && (ctinfo == IP_CT_RELATED
320 || ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
321 return XT_CONTINUE;
322
323 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
324 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
325 * on, which all have an ID field [relevant for hashing]. */
326
327 hash = clusterip_hashfn(*pskb, cipinfo->config);
328
329 switch (ctinfo) {
330 case IP_CT_NEW:
331 ct->mark = hash;
332 break;
333 case IP_CT_RELATED:
334 case IP_CT_RELATED+IP_CT_IS_REPLY:
335 /* FIXME: we don't handle expectations at the
336 * moment. they can arrive on a different node than
337 * the master connection (e.g. FTP passive mode) */
338 case IP_CT_ESTABLISHED:
339 case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
340 break;
341 default:
342 break;
343 }
344
345 #ifdef DEBUG
346 DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
347 #endif
348 pr_debug("hash=%u ct_hash=%u ", hash, ct->mark);
349 if (!clusterip_responsible(cipinfo->config, hash)) {
350 pr_debug("not responsible\n");
351 return NF_DROP;
352 }
353 pr_debug("responsible\n");
354
355 /* despite being received via linklayer multicast, this is
356 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
357 (*pskb)->pkt_type = PACKET_HOST;
358
359 return XT_CONTINUE;
360 }
361
362 static bool
363 checkentry(const char *tablename,
364 const void *e_void,
365 const struct xt_target *target,
366 void *targinfo,
367 unsigned int hook_mask)
368 {
369 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
370 const struct ipt_entry *e = e_void;
371
372 struct clusterip_config *config;
373
374 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
375 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
376 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
377 printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
378 cipinfo->hash_mode);
379 return false;
380
381 }
382 if (e->ip.dmsk.s_addr != htonl(0xffffffff)
383 || e->ip.dst.s_addr == 0) {
384 printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
385 return false;
386 }
387
388 /* FIXME: further sanity checks */
389
390 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
391 if (!config) {
392 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
393 printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
394 return false;
395 } else {
396 struct net_device *dev;
397
398 if (e->ip.iniface[0] == '\0') {
399 printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
400 return false;
401 }
402
403 dev = dev_get_by_name(e->ip.iniface);
404 if (!dev) {
405 printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
406 return false;
407 }
408
409 config = clusterip_config_init(cipinfo,
410 e->ip.dst.s_addr, dev);
411 if (!config) {
412 printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
413 dev_put(dev);
414 return false;
415 }
416 dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
417 }
418 }
419 cipinfo->config = config;
420
421 if (nf_ct_l3proto_try_module_get(target->family) < 0) {
422 printk(KERN_WARNING "can't load conntrack support for "
423 "proto=%d\n", target->family);
424 return false;
425 }
426
427 return true;
428 }
429
430 /* drop reference count of cluster config when rule is deleted */
431 static void destroy(const struct xt_target *target, void *targinfo)
432 {
433 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
434
435 /* if no more entries are referencing the config, remove it
436 * from the list and destroy the proc entry */
437 clusterip_config_entry_put(cipinfo->config);
438
439 clusterip_config_put(cipinfo->config);
440
441 nf_ct_l3proto_module_put(target->family);
442 }
443
444 #ifdef CONFIG_COMPAT
445 struct compat_ipt_clusterip_tgt_info
446 {
447 u_int32_t flags;
448 u_int8_t clustermac[6];
449 u_int16_t num_total_nodes;
450 u_int16_t num_local_nodes;
451 u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
452 u_int32_t hash_mode;
453 u_int32_t hash_initval;
454 compat_uptr_t config;
455 };
456 #endif /* CONFIG_COMPAT */
457
458 static struct xt_target clusterip_tgt __read_mostly = {
459 .name = "CLUSTERIP",
460 .family = AF_INET,
461 .target = target,
462 .checkentry = checkentry,
463 .destroy = destroy,
464 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
465 #ifdef CONFIG_COMPAT
466 .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
467 #endif /* CONFIG_COMPAT */
468 .me = THIS_MODULE
469 };
470
471
472 /***********************************************************************
473 * ARP MANGLING CODE
474 ***********************************************************************/
475
476 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
477 struct arp_payload {
478 u_int8_t src_hw[ETH_ALEN];
479 __be32 src_ip;
480 u_int8_t dst_hw[ETH_ALEN];
481 __be32 dst_ip;
482 } __attribute__ ((packed));
483
484 #ifdef DEBUG
485 static void arp_print(struct arp_payload *payload)
486 {
487 #define HBUFFERLEN 30
488 char hbuffer[HBUFFERLEN];
489 int j,k;
490 const char hexbuf[]= "0123456789abcdef";
491
492 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
493 hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
494 hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
495 hbuffer[k++]=':';
496 }
497 hbuffer[--k]='\0';
498
499 printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n",
500 NIPQUAD(payload->src_ip), hbuffer,
501 NIPQUAD(payload->dst_ip));
502 }
503 #endif
504
505 static unsigned int
506 arp_mangle(unsigned int hook,
507 struct sk_buff **pskb,
508 const struct net_device *in,
509 const struct net_device *out,
510 int (*okfn)(struct sk_buff *))
511 {
512 struct arphdr *arp = arp_hdr(*pskb);
513 struct arp_payload *payload;
514 struct clusterip_config *c;
515
516 /* we don't care about non-ethernet and non-ipv4 ARP */
517 if (arp->ar_hrd != htons(ARPHRD_ETHER)
518 || arp->ar_pro != htons(ETH_P_IP)
519 || arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
520 return NF_ACCEPT;
521
522 /* we only want to mangle arp requests and replies */
523 if (arp->ar_op != htons(ARPOP_REPLY)
524 && arp->ar_op != htons(ARPOP_REQUEST))
525 return NF_ACCEPT;
526
527 payload = (void *)(arp+1);
528
529 /* if there is no clusterip configuration for the arp reply's
530 * source ip, we don't want to mangle it */
531 c = clusterip_config_find_get(payload->src_ip, 0);
532 if (!c)
533 return NF_ACCEPT;
534
535 /* normally the linux kernel always replies to arp queries of
536 * addresses on different interfacs. However, in the CLUSTERIP case
537 * this wouldn't work, since we didn't subscribe the mcast group on
538 * other interfaces */
539 if (c->dev != out) {
540 pr_debug("CLUSTERIP: not mangling arp reply on different "
541 "interface: cip'%s'-skb'%s'\n",
542 c->dev->name, out->name);
543 clusterip_config_put(c);
544 return NF_ACCEPT;
545 }
546
547 /* mangle reply hardware address */
548 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
549
550 #ifdef DEBUG
551 pr_debug(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
552 arp_print(payload);
553 #endif
554
555 clusterip_config_put(c);
556
557 return NF_ACCEPT;
558 }
559
560 static struct nf_hook_ops cip_arp_ops = {
561 .hook = arp_mangle,
562 .pf = NF_ARP,
563 .hooknum = NF_ARP_OUT,
564 .priority = -1
565 };
566
567 /***********************************************************************
568 * PROC DIR HANDLING
569 ***********************************************************************/
570
571 #ifdef CONFIG_PROC_FS
572
573 struct clusterip_seq_position {
574 unsigned int pos; /* position */
575 unsigned int weight; /* number of bits set == size */
576 unsigned int bit; /* current bit */
577 unsigned long val; /* current value */
578 };
579
580 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
581 {
582 struct proc_dir_entry *pde = s->private;
583 struct clusterip_config *c = pde->data;
584 unsigned int weight;
585 u_int32_t local_nodes;
586 struct clusterip_seq_position *idx;
587
588 /* FIXME: possible race */
589 local_nodes = c->local_nodes;
590 weight = hweight32(local_nodes);
591 if (*pos >= weight)
592 return NULL;
593
594 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
595 if (!idx)
596 return ERR_PTR(-ENOMEM);
597
598 idx->pos = *pos;
599 idx->weight = weight;
600 idx->bit = ffs(local_nodes);
601 idx->val = local_nodes;
602 clear_bit(idx->bit - 1, &idx->val);
603
604 return idx;
605 }
606
607 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
608 {
609 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
610
611 *pos = ++idx->pos;
612 if (*pos >= idx->weight) {
613 kfree(v);
614 return NULL;
615 }
616 idx->bit = ffs(idx->val);
617 clear_bit(idx->bit - 1, &idx->val);
618 return idx;
619 }
620
621 static void clusterip_seq_stop(struct seq_file *s, void *v)
622 {
623 kfree(v);
624 }
625
626 static int clusterip_seq_show(struct seq_file *s, void *v)
627 {
628 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
629
630 if (idx->pos != 0)
631 seq_putc(s, ',');
632
633 seq_printf(s, "%u", idx->bit);
634
635 if (idx->pos == idx->weight - 1)
636 seq_putc(s, '\n');
637
638 return 0;
639 }
640
641 static const struct seq_operations clusterip_seq_ops = {
642 .start = clusterip_seq_start,
643 .next = clusterip_seq_next,
644 .stop = clusterip_seq_stop,
645 .show = clusterip_seq_show,
646 };
647
648 static int clusterip_proc_open(struct inode *inode, struct file *file)
649 {
650 int ret = seq_open(file, &clusterip_seq_ops);
651
652 if (!ret) {
653 struct seq_file *sf = file->private_data;
654 struct proc_dir_entry *pde = PDE(inode);
655 struct clusterip_config *c = pde->data;
656
657 sf->private = pde;
658
659 clusterip_config_get(c);
660 }
661
662 return ret;
663 }
664
665 static int clusterip_proc_release(struct inode *inode, struct file *file)
666 {
667 struct proc_dir_entry *pde = PDE(inode);
668 struct clusterip_config *c = pde->data;
669 int ret;
670
671 ret = seq_release(inode, file);
672
673 if (!ret)
674 clusterip_config_put(c);
675
676 return ret;
677 }
678
679 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
680 size_t size, loff_t *ofs)
681 {
682 #define PROC_WRITELEN 10
683 char buffer[PROC_WRITELEN+1];
684 struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
685 struct clusterip_config *c = pde->data;
686 unsigned long nodenum;
687
688 if (copy_from_user(buffer, input, PROC_WRITELEN))
689 return -EFAULT;
690
691 if (*buffer == '+') {
692 nodenum = simple_strtoul(buffer+1, NULL, 10);
693 if (clusterip_add_node(c, nodenum))
694 return -ENOMEM;
695 } else if (*buffer == '-') {
696 nodenum = simple_strtoul(buffer+1, NULL,10);
697 if (clusterip_del_node(c, nodenum))
698 return -ENOENT;
699 } else
700 return -EIO;
701
702 return size;
703 }
704
705 static const struct file_operations clusterip_proc_fops = {
706 .owner = THIS_MODULE,
707 .open = clusterip_proc_open,
708 .read = seq_read,
709 .write = clusterip_proc_write,
710 .llseek = seq_lseek,
711 .release = clusterip_proc_release,
712 };
713
714 #endif /* CONFIG_PROC_FS */
715
716 static int __init ipt_clusterip_init(void)
717 {
718 int ret;
719
720 ret = xt_register_target(&clusterip_tgt);
721 if (ret < 0)
722 return ret;
723
724 ret = nf_register_hook(&cip_arp_ops);
725 if (ret < 0)
726 goto cleanup_target;
727
728 #ifdef CONFIG_PROC_FS
729 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", proc_net);
730 if (!clusterip_procdir) {
731 printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
732 ret = -ENOMEM;
733 goto cleanup_hook;
734 }
735 #endif /* CONFIG_PROC_FS */
736
737 printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
738 CLUSTERIP_VERSION);
739 return 0;
740
741 #ifdef CONFIG_PROC_FS
742 cleanup_hook:
743 nf_unregister_hook(&cip_arp_ops);
744 #endif /* CONFIG_PROC_FS */
745 cleanup_target:
746 xt_unregister_target(&clusterip_tgt);
747 return ret;
748 }
749
750 static void __exit ipt_clusterip_fini(void)
751 {
752 printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
753 CLUSTERIP_VERSION);
754 #ifdef CONFIG_PROC_FS
755 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
756 #endif
757 nf_unregister_hook(&cip_arp_ops);
758 xt_unregister_target(&clusterip_tgt);
759 }
760
761 module_init(ipt_clusterip_init);
762 module_exit(ipt_clusterip_fini);
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