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[NETFILTER]: x_tables: mark matches and targets __read_mostly
[mirror_ubuntu-bionic-kernel.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 #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/proc_fs.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/checksum.h>
30
31 #define CLUSTERIP_VERSION "0.8"
32
33 #define DEBUG_CLUSTERIP
34
35 #ifdef DEBUG_CLUSTERIP
36 #define DEBUGP printk
37 #else
38 #define DEBUGP
39 #endif
40
41 MODULE_LICENSE("GPL");
42 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
43 MODULE_DESCRIPTION("iptables target for CLUSTERIP");
44
45 struct clusterip_config {
46 struct list_head list; /* list of all configs */
47 atomic_t refcount; /* reference count */
48 atomic_t entries; /* number of entries/rules
49 * referencing us */
50
51 __be32 clusterip; /* the IP address */
52 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
53 struct net_device *dev; /* device */
54 u_int16_t num_total_nodes; /* total number of nodes */
55 unsigned long local_nodes; /* node number array */
56
57 #ifdef CONFIG_PROC_FS
58 struct proc_dir_entry *pde; /* proc dir entry */
59 #endif
60 enum clusterip_hashmode hash_mode; /* which hashing mode */
61 u_int32_t hash_initval; /* hash initialization */
62 };
63
64 static LIST_HEAD(clusterip_configs);
65
66 /* clusterip_lock protects the clusterip_configs list */
67 static DEFINE_RWLOCK(clusterip_lock);
68
69 #ifdef CONFIG_PROC_FS
70 static const struct file_operations clusterip_proc_fops;
71 static struct proc_dir_entry *clusterip_procdir;
72 #endif
73
74 static inline void
75 clusterip_config_get(struct clusterip_config *c)
76 {
77 atomic_inc(&c->refcount);
78 }
79
80 static inline void
81 clusterip_config_put(struct clusterip_config *c)
82 {
83 if (atomic_dec_and_test(&c->refcount))
84 kfree(c);
85 }
86
87 /* increase the count of entries(rules) using/referencing this config */
88 static inline void
89 clusterip_config_entry_get(struct clusterip_config *c)
90 {
91 atomic_inc(&c->entries);
92 }
93
94 /* decrease the count of entries using/referencing this config. If last
95 * entry(rule) is removed, remove the config from lists, but don't free it
96 * yet, since proc-files could still be holding references */
97 static inline void
98 clusterip_config_entry_put(struct clusterip_config *c)
99 {
100 if (atomic_dec_and_test(&c->entries)) {
101 write_lock_bh(&clusterip_lock);
102 list_del(&c->list);
103 write_unlock_bh(&clusterip_lock);
104
105 dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
106 dev_put(c->dev);
107
108 /* In case anyone still accesses the file, the open/close
109 * functions are also incrementing the refcount on their own,
110 * so it's safe to remove the entry even if it's in use. */
111 #ifdef CONFIG_PROC_FS
112 remove_proc_entry(c->pde->name, c->pde->parent);
113 #endif
114 }
115 }
116
117 static struct clusterip_config *
118 __clusterip_config_find(__be32 clusterip)
119 {
120 struct list_head *pos;
121
122 list_for_each(pos, &clusterip_configs) {
123 struct clusterip_config *c = list_entry(pos,
124 struct clusterip_config, list);
125 if (c->clusterip == clusterip)
126 return c;
127 }
128
129 return NULL;
130 }
131
132 static inline struct clusterip_config *
133 clusterip_config_find_get(__be32 clusterip, int entry)
134 {
135 struct clusterip_config *c;
136
137 read_lock_bh(&clusterip_lock);
138 c = __clusterip_config_find(clusterip);
139 if (!c) {
140 read_unlock_bh(&clusterip_lock);
141 return NULL;
142 }
143 atomic_inc(&c->refcount);
144 if (entry)
145 atomic_inc(&c->entries);
146 read_unlock_bh(&clusterip_lock);
147
148 return c;
149 }
150
151 static void
152 clusterip_config_init_nodelist(struct clusterip_config *c,
153 const struct ipt_clusterip_tgt_info *i)
154 {
155 int n;
156
157 for (n = 0; n < i->num_local_nodes; n++)
158 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
159 }
160
161 static struct clusterip_config *
162 clusterip_config_init(struct ipt_clusterip_tgt_info *i, __be32 ip,
163 struct net_device *dev)
164 {
165 struct clusterip_config *c;
166
167 c = kzalloc(sizeof(*c), GFP_ATOMIC);
168 if (!c)
169 return NULL;
170
171 c->dev = dev;
172 c->clusterip = ip;
173 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
174 c->num_total_nodes = i->num_total_nodes;
175 clusterip_config_init_nodelist(c, i);
176 c->hash_mode = i->hash_mode;
177 c->hash_initval = i->hash_initval;
178 atomic_set(&c->refcount, 1);
179 atomic_set(&c->entries, 1);
180
181 #ifdef CONFIG_PROC_FS
182 {
183 char buffer[16];
184
185 /* create proc dir entry */
186 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
187 c->pde = create_proc_entry(buffer, S_IWUSR|S_IRUSR,
188 clusterip_procdir);
189 if (!c->pde) {
190 kfree(c);
191 return NULL;
192 }
193 }
194 c->pde->proc_fops = &clusterip_proc_fops;
195 c->pde->data = c;
196 #endif
197
198 write_lock_bh(&clusterip_lock);
199 list_add(&c->list, &clusterip_configs);
200 write_unlock_bh(&clusterip_lock);
201
202 return c;
203 }
204
205 #ifdef CONFIG_PROC_FS
206 static int
207 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
208 {
209
210 if (nodenum == 0 ||
211 nodenum > c->num_total_nodes)
212 return 1;
213
214 /* check if we already have this number in our bitfield */
215 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
216 return 1;
217
218 return 0;
219 }
220
221 static bool
222 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
223 {
224 if (nodenum == 0 ||
225 nodenum > c->num_total_nodes)
226 return true;
227
228 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
229 return false;
230
231 return true;
232 }
233 #endif
234
235 static inline u_int32_t
236 clusterip_hashfn(const struct sk_buff *skb,
237 const struct clusterip_config *config)
238 {
239 const struct iphdr *iph = ip_hdr(skb);
240 unsigned long hashval;
241 u_int16_t sport, dport;
242 const u_int16_t *ports;
243
244 switch (iph->protocol) {
245 case IPPROTO_TCP:
246 case IPPROTO_UDP:
247 case IPPROTO_UDPLITE:
248 case IPPROTO_SCTP:
249 case IPPROTO_DCCP:
250 case IPPROTO_ICMP:
251 ports = (const void *)iph+iph->ihl*4;
252 sport = ports[0];
253 dport = ports[1];
254 break;
255 default:
256 if (net_ratelimit())
257 printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
258 iph->protocol);
259 sport = dport = 0;
260 }
261
262 switch (config->hash_mode) {
263 case CLUSTERIP_HASHMODE_SIP:
264 hashval = jhash_1word(ntohl(iph->saddr),
265 config->hash_initval);
266 break;
267 case CLUSTERIP_HASHMODE_SIP_SPT:
268 hashval = jhash_2words(ntohl(iph->saddr), sport,
269 config->hash_initval);
270 break;
271 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
272 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
273 config->hash_initval);
274 break;
275 default:
276 /* to make gcc happy */
277 hashval = 0;
278 /* This cannot happen, unless the check function wasn't called
279 * at rule load time */
280 printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
281 BUG();
282 break;
283 }
284
285 /* node numbers are 1..n, not 0..n */
286 return (hashval % config->num_total_nodes) + 1;
287 }
288
289 static inline int
290 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
291 {
292 return test_bit(hash - 1, &config->local_nodes);
293 }
294
295 /***********************************************************************
296 * IPTABLES TARGET
297 ***********************************************************************/
298
299 static unsigned int
300 target(struct sk_buff **pskb,
301 const struct net_device *in,
302 const struct net_device *out,
303 unsigned int hooknum,
304 const struct xt_target *target,
305 const void *targinfo)
306 {
307 const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
308 struct nf_conn *ct;
309 enum ip_conntrack_info ctinfo;
310 u_int32_t hash;
311
312 /* don't need to clusterip_config_get() here, since refcount
313 * is only decremented by destroy() - and ip_tables guarantees
314 * that the ->target() function isn't called after ->destroy() */
315
316 ct = nf_ct_get(*pskb, &ctinfo);
317 if (ct == NULL) {
318 printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
319 /* FIXME: need to drop invalid ones, since replies
320 * to outgoing connections of other nodes will be
321 * marked as INVALID */
322 return NF_DROP;
323 }
324
325 /* special case: ICMP error handling. conntrack distinguishes between
326 * error messages (RELATED) and information requests (see below) */
327 if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP
328 && (ctinfo == IP_CT_RELATED
329 || ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
330 return XT_CONTINUE;
331
332 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
333 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
334 * on, which all have an ID field [relevant for hashing]. */
335
336 hash = clusterip_hashfn(*pskb, cipinfo->config);
337
338 switch (ctinfo) {
339 case IP_CT_NEW:
340 ct->mark = hash;
341 break;
342 case IP_CT_RELATED:
343 case IP_CT_RELATED+IP_CT_IS_REPLY:
344 /* FIXME: we don't handle expectations at the
345 * moment. they can arrive on a different node than
346 * the master connection (e.g. FTP passive mode) */
347 case IP_CT_ESTABLISHED:
348 case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
349 break;
350 default:
351 break;
352 }
353
354 #ifdef DEBUG_CLUSTERP
355 DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
356 #endif
357 DEBUGP("hash=%u ct_hash=%u ", hash, ct->mark);
358 if (!clusterip_responsible(cipinfo->config, hash)) {
359 DEBUGP("not responsible\n");
360 return NF_DROP;
361 }
362 DEBUGP("responsible\n");
363
364 /* despite being received via linklayer multicast, this is
365 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
366 (*pskb)->pkt_type = PACKET_HOST;
367
368 return XT_CONTINUE;
369 }
370
371 static bool
372 checkentry(const char *tablename,
373 const void *e_void,
374 const struct xt_target *target,
375 void *targinfo,
376 unsigned int hook_mask)
377 {
378 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
379 const struct ipt_entry *e = e_void;
380
381 struct clusterip_config *config;
382
383 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
384 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
385 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
386 printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
387 cipinfo->hash_mode);
388 return false;
389
390 }
391 if (e->ip.dmsk.s_addr != htonl(0xffffffff)
392 || e->ip.dst.s_addr == 0) {
393 printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
394 return false;
395 }
396
397 /* FIXME: further sanity checks */
398
399 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
400 if (config) {
401 if (cipinfo->config != NULL) {
402 /* Case A: This is an entry that gets reloaded, since
403 * it still has a cipinfo->config pointer. Simply
404 * increase the entry refcount and return */
405 if (cipinfo->config != config) {
406 printk(KERN_ERR "CLUSTERIP: Reloaded entry "
407 "has invalid config pointer!\n");
408 return false;
409 }
410 } else {
411 /* Case B: This is a new rule referring to an existing
412 * clusterip config. */
413 cipinfo->config = config;
414 }
415 } else {
416 /* Case C: This is a completely new clusterip config */
417 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
418 printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
419 return false;
420 } else {
421 struct net_device *dev;
422
423 if (e->ip.iniface[0] == '\0') {
424 printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
425 return false;
426 }
427
428 dev = dev_get_by_name(e->ip.iniface);
429 if (!dev) {
430 printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
431 return false;
432 }
433
434 config = clusterip_config_init(cipinfo,
435 e->ip.dst.s_addr, dev);
436 if (!config) {
437 printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
438 dev_put(dev);
439 return false;
440 }
441 dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
442 }
443 cipinfo->config = config;
444 }
445
446 if (nf_ct_l3proto_try_module_get(target->family) < 0) {
447 printk(KERN_WARNING "can't load conntrack support for "
448 "proto=%d\n", target->family);
449 return false;
450 }
451
452 return true;
453 }
454
455 /* drop reference count of cluster config when rule is deleted */
456 static void destroy(const struct xt_target *target, void *targinfo)
457 {
458 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
459
460 /* if no more entries are referencing the config, remove it
461 * from the list and destroy the proc entry */
462 clusterip_config_entry_put(cipinfo->config);
463
464 clusterip_config_put(cipinfo->config);
465
466 nf_ct_l3proto_module_put(target->family);
467 }
468
469 static struct xt_target clusterip_tgt __read_mostly = {
470 .name = "CLUSTERIP",
471 .family = AF_INET,
472 .target = target,
473 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
474 .checkentry = checkentry,
475 .destroy = destroy,
476 .me = THIS_MODULE
477 };
478
479
480 /***********************************************************************
481 * ARP MANGLING CODE
482 ***********************************************************************/
483
484 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
485 struct arp_payload {
486 u_int8_t src_hw[ETH_ALEN];
487 __be32 src_ip;
488 u_int8_t dst_hw[ETH_ALEN];
489 __be32 dst_ip;
490 } __attribute__ ((packed));
491
492 #ifdef CLUSTERIP_DEBUG
493 static void arp_print(struct arp_payload *payload)
494 {
495 #define HBUFFERLEN 30
496 char hbuffer[HBUFFERLEN];
497 int j,k;
498 const char hexbuf[]= "0123456789abcdef";
499
500 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
501 hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
502 hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
503 hbuffer[k++]=':';
504 }
505 hbuffer[--k]='\0';
506
507 printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n",
508 NIPQUAD(payload->src_ip), hbuffer,
509 NIPQUAD(payload->dst_ip));
510 }
511 #endif
512
513 static unsigned int
514 arp_mangle(unsigned int hook,
515 struct sk_buff **pskb,
516 const struct net_device *in,
517 const struct net_device *out,
518 int (*okfn)(struct sk_buff *))
519 {
520 struct arphdr *arp = arp_hdr(*pskb);
521 struct arp_payload *payload;
522 struct clusterip_config *c;
523
524 /* we don't care about non-ethernet and non-ipv4 ARP */
525 if (arp->ar_hrd != htons(ARPHRD_ETHER)
526 || arp->ar_pro != htons(ETH_P_IP)
527 || arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
528 return NF_ACCEPT;
529
530 /* we only want to mangle arp requests and replies */
531 if (arp->ar_op != htons(ARPOP_REPLY)
532 && arp->ar_op != htons(ARPOP_REQUEST))
533 return NF_ACCEPT;
534
535 payload = (void *)(arp+1);
536
537 /* if there is no clusterip configuration for the arp reply's
538 * source ip, we don't want to mangle it */
539 c = clusterip_config_find_get(payload->src_ip, 0);
540 if (!c)
541 return NF_ACCEPT;
542
543 /* normally the linux kernel always replies to arp queries of
544 * addresses on different interfacs. However, in the CLUSTERIP case
545 * this wouldn't work, since we didn't subscribe the mcast group on
546 * other interfaces */
547 if (c->dev != out) {
548 DEBUGP("CLUSTERIP: not mangling arp reply on different "
549 "interface: cip'%s'-skb'%s'\n", c->dev->name, out->name);
550 clusterip_config_put(c);
551 return NF_ACCEPT;
552 }
553
554 /* mangle reply hardware address */
555 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
556
557 #ifdef CLUSTERIP_DEBUG
558 DEBUGP(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
559 arp_print(payload);
560 #endif
561
562 clusterip_config_put(c);
563
564 return NF_ACCEPT;
565 }
566
567 static struct nf_hook_ops cip_arp_ops = {
568 .hook = arp_mangle,
569 .pf = NF_ARP,
570 .hooknum = NF_ARP_OUT,
571 .priority = -1
572 };
573
574 /***********************************************************************
575 * PROC DIR HANDLING
576 ***********************************************************************/
577
578 #ifdef CONFIG_PROC_FS
579
580 struct clusterip_seq_position {
581 unsigned int pos; /* position */
582 unsigned int weight; /* number of bits set == size */
583 unsigned int bit; /* current bit */
584 unsigned long val; /* current value */
585 };
586
587 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
588 {
589 struct proc_dir_entry *pde = s->private;
590 struct clusterip_config *c = pde->data;
591 unsigned int weight;
592 u_int32_t local_nodes;
593 struct clusterip_seq_position *idx;
594
595 /* FIXME: possible race */
596 local_nodes = c->local_nodes;
597 weight = hweight32(local_nodes);
598 if (*pos >= weight)
599 return NULL;
600
601 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
602 if (!idx)
603 return ERR_PTR(-ENOMEM);
604
605 idx->pos = *pos;
606 idx->weight = weight;
607 idx->bit = ffs(local_nodes);
608 idx->val = local_nodes;
609 clear_bit(idx->bit - 1, &idx->val);
610
611 return idx;
612 }
613
614 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
615 {
616 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
617
618 *pos = ++idx->pos;
619 if (*pos >= idx->weight) {
620 kfree(v);
621 return NULL;
622 }
623 idx->bit = ffs(idx->val);
624 clear_bit(idx->bit - 1, &idx->val);
625 return idx;
626 }
627
628 static void clusterip_seq_stop(struct seq_file *s, void *v)
629 {
630 kfree(v);
631 }
632
633 static int clusterip_seq_show(struct seq_file *s, void *v)
634 {
635 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
636
637 if (idx->pos != 0)
638 seq_putc(s, ',');
639
640 seq_printf(s, "%u", idx->bit);
641
642 if (idx->pos == idx->weight - 1)
643 seq_putc(s, '\n');
644
645 return 0;
646 }
647
648 static struct seq_operations clusterip_seq_ops = {
649 .start = clusterip_seq_start,
650 .next = clusterip_seq_next,
651 .stop = clusterip_seq_stop,
652 .show = clusterip_seq_show,
653 };
654
655 static int clusterip_proc_open(struct inode *inode, struct file *file)
656 {
657 int ret = seq_open(file, &clusterip_seq_ops);
658
659 if (!ret) {
660 struct seq_file *sf = file->private_data;
661 struct proc_dir_entry *pde = PDE(inode);
662 struct clusterip_config *c = pde->data;
663
664 sf->private = pde;
665
666 clusterip_config_get(c);
667 }
668
669 return ret;
670 }
671
672 static int clusterip_proc_release(struct inode *inode, struct file *file)
673 {
674 struct proc_dir_entry *pde = PDE(inode);
675 struct clusterip_config *c = pde->data;
676 int ret;
677
678 ret = seq_release(inode, file);
679
680 if (!ret)
681 clusterip_config_put(c);
682
683 return ret;
684 }
685
686 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
687 size_t size, loff_t *ofs)
688 {
689 #define PROC_WRITELEN 10
690 char buffer[PROC_WRITELEN+1];
691 struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
692 struct clusterip_config *c = pde->data;
693 unsigned long nodenum;
694
695 if (copy_from_user(buffer, input, PROC_WRITELEN))
696 return -EFAULT;
697
698 if (*buffer == '+') {
699 nodenum = simple_strtoul(buffer+1, NULL, 10);
700 if (clusterip_add_node(c, nodenum))
701 return -ENOMEM;
702 } else if (*buffer == '-') {
703 nodenum = simple_strtoul(buffer+1, NULL,10);
704 if (clusterip_del_node(c, nodenum))
705 return -ENOENT;
706 } else
707 return -EIO;
708
709 return size;
710 }
711
712 static const struct file_operations clusterip_proc_fops = {
713 .owner = THIS_MODULE,
714 .open = clusterip_proc_open,
715 .read = seq_read,
716 .write = clusterip_proc_write,
717 .llseek = seq_lseek,
718 .release = clusterip_proc_release,
719 };
720
721 #endif /* CONFIG_PROC_FS */
722
723 static int __init ipt_clusterip_init(void)
724 {
725 int ret;
726
727 ret = xt_register_target(&clusterip_tgt);
728 if (ret < 0)
729 return ret;
730
731 ret = nf_register_hook(&cip_arp_ops);
732 if (ret < 0)
733 goto cleanup_target;
734
735 #ifdef CONFIG_PROC_FS
736 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", proc_net);
737 if (!clusterip_procdir) {
738 printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
739 ret = -ENOMEM;
740 goto cleanup_hook;
741 }
742 #endif /* CONFIG_PROC_FS */
743
744 printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
745 CLUSTERIP_VERSION);
746 return 0;
747
748 #ifdef CONFIG_PROC_FS
749 cleanup_hook:
750 nf_unregister_hook(&cip_arp_ops);
751 #endif /* CONFIG_PROC_FS */
752 cleanup_target:
753 xt_unregister_target(&clusterip_tgt);
754 return ret;
755 }
756
757 static void __exit ipt_clusterip_fini(void)
758 {
759 printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
760 CLUSTERIP_VERSION);
761 #ifdef CONFIG_PROC_FS
762 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
763 #endif
764 nf_unregister_hook(&cip_arp_ops);
765 xt_unregister_target(&clusterip_tgt);
766 }
767
768 module_init(ipt_clusterip_init);
769 module_exit(ipt_clusterip_fini);
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