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[SK_BUFF]: Introduce ip_hdr(), remove skb->nh.iph
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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
25 #include <net/checksum.h>
26
27 #include <linux/netfilter_arp.h>
28
29 #include <linux/netfilter/x_tables.h>
30 #include <linux/netfilter_ipv4/ip_tables.h>
31 #include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
32 #include <net/netfilter/nf_conntrack_compat.h>
33
34 #define CLUSTERIP_VERSION "0.8"
35
36 #define DEBUG_CLUSTERIP
37
38 #ifdef DEBUG_CLUSTERIP
39 #define DEBUGP printk
40 #else
41 #define DEBUGP
42 #endif
43
44 MODULE_LICENSE("GPL");
45 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
46 MODULE_DESCRIPTION("iptables target for CLUSTERIP");
47
48 struct clusterip_config {
49 struct list_head list; /* list of all configs */
50 atomic_t refcount; /* reference count */
51 atomic_t entries; /* number of entries/rules
52 * referencing us */
53
54 __be32 clusterip; /* the IP address */
55 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
56 struct net_device *dev; /* device */
57 u_int16_t num_total_nodes; /* total number of nodes */
58 unsigned long local_nodes; /* node number array */
59
60 #ifdef CONFIG_PROC_FS
61 struct proc_dir_entry *pde; /* proc dir entry */
62 #endif
63 enum clusterip_hashmode hash_mode; /* which hashing mode */
64 u_int32_t hash_initval; /* hash initialization */
65 };
66
67 static LIST_HEAD(clusterip_configs);
68
69 /* clusterip_lock protects the clusterip_configs list */
70 static DEFINE_RWLOCK(clusterip_lock);
71
72 #ifdef CONFIG_PROC_FS
73 static const struct file_operations clusterip_proc_fops;
74 static struct proc_dir_entry *clusterip_procdir;
75 #endif
76
77 static inline void
78 clusterip_config_get(struct clusterip_config *c)
79 {
80 atomic_inc(&c->refcount);
81 }
82
83 static inline void
84 clusterip_config_put(struct clusterip_config *c)
85 {
86 if (atomic_dec_and_test(&c->refcount))
87 kfree(c);
88 }
89
90 /* increase the count of entries(rules) using/referencing this config */
91 static inline void
92 clusterip_config_entry_get(struct clusterip_config *c)
93 {
94 atomic_inc(&c->entries);
95 }
96
97 /* decrease the count of entries using/referencing this config. If last
98 * entry(rule) is removed, remove the config from lists, but don't free it
99 * yet, since proc-files could still be holding references */
100 static inline void
101 clusterip_config_entry_put(struct clusterip_config *c)
102 {
103 if (atomic_dec_and_test(&c->entries)) {
104 write_lock_bh(&clusterip_lock);
105 list_del(&c->list);
106 write_unlock_bh(&clusterip_lock);
107
108 dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
109 dev_put(c->dev);
110
111 /* In case anyone still accesses the file, the open/close
112 * functions are also incrementing the refcount on their own,
113 * so it's safe to remove the entry even if it's in use. */
114 #ifdef CONFIG_PROC_FS
115 remove_proc_entry(c->pde->name, c->pde->parent);
116 #endif
117 }
118 }
119
120 static struct clusterip_config *
121 __clusterip_config_find(__be32 clusterip)
122 {
123 struct list_head *pos;
124
125 list_for_each(pos, &clusterip_configs) {
126 struct clusterip_config *c = list_entry(pos,
127 struct clusterip_config, list);
128 if (c->clusterip == clusterip) {
129 return c;
130 }
131 }
132
133 return NULL;
134 }
135
136 static inline struct clusterip_config *
137 clusterip_config_find_get(__be32 clusterip, int entry)
138 {
139 struct clusterip_config *c;
140
141 read_lock_bh(&clusterip_lock);
142 c = __clusterip_config_find(clusterip);
143 if (!c) {
144 read_unlock_bh(&clusterip_lock);
145 return NULL;
146 }
147 atomic_inc(&c->refcount);
148 if (entry)
149 atomic_inc(&c->entries);
150 read_unlock_bh(&clusterip_lock);
151
152 return c;
153 }
154
155 static void
156 clusterip_config_init_nodelist(struct clusterip_config *c,
157 const struct ipt_clusterip_tgt_info *i)
158 {
159 int n;
160
161 for (n = 0; n < i->num_local_nodes; n++) {
162 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
163 }
164 }
165
166 static struct clusterip_config *
167 clusterip_config_init(struct ipt_clusterip_tgt_info *i, __be32 ip,
168 struct net_device *dev)
169 {
170 struct clusterip_config *c;
171
172 c = kzalloc(sizeof(*c), GFP_ATOMIC);
173 if (!c)
174 return NULL;
175
176 c->dev = dev;
177 c->clusterip = ip;
178 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
179 c->num_total_nodes = i->num_total_nodes;
180 clusterip_config_init_nodelist(c, i);
181 c->hash_mode = i->hash_mode;
182 c->hash_initval = i->hash_initval;
183 atomic_set(&c->refcount, 1);
184 atomic_set(&c->entries, 1);
185
186 #ifdef CONFIG_PROC_FS
187 {
188 char buffer[16];
189
190 /* create proc dir entry */
191 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
192 c->pde = create_proc_entry(buffer, S_IWUSR|S_IRUSR,
193 clusterip_procdir);
194 if (!c->pde) {
195 kfree(c);
196 return NULL;
197 }
198 }
199 c->pde->proc_fops = &clusterip_proc_fops;
200 c->pde->data = c;
201 #endif
202
203 write_lock_bh(&clusterip_lock);
204 list_add(&c->list, &clusterip_configs);
205 write_unlock_bh(&clusterip_lock);
206
207 return c;
208 }
209
210 #ifdef CONFIG_PROC_FS
211 static int
212 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
213 {
214
215 if (nodenum == 0 ||
216 nodenum > c->num_total_nodes)
217 return 1;
218
219 /* check if we already have this number in our bitfield */
220 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
221 return 1;
222
223 return 0;
224 }
225
226 static int
227 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
228 {
229 if (nodenum == 0 ||
230 nodenum > c->num_total_nodes)
231 return 1;
232
233 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
234 return 0;
235
236 return 1;
237 }
238 #endif
239
240 static inline u_int32_t
241 clusterip_hashfn(struct sk_buff *skb, struct clusterip_config *config)
242 {
243 struct iphdr *iph = ip_hdr(skb);
244 unsigned long hashval;
245 u_int16_t sport, dport;
246 u_int16_t *ports;
247
248 switch (iph->protocol) {
249 case IPPROTO_TCP:
250 case IPPROTO_UDP:
251 case IPPROTO_UDPLITE:
252 case IPPROTO_SCTP:
253 case IPPROTO_DCCP:
254 case IPPROTO_ICMP:
255 ports = (void *)iph+iph->ihl*4;
256 sport = ports[0];
257 dport = ports[1];
258 break;
259 default:
260 if (net_ratelimit()) {
261 printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
262 iph->protocol);
263 }
264 sport = dport = 0;
265 }
266
267 switch (config->hash_mode) {
268 case CLUSTERIP_HASHMODE_SIP:
269 hashval = jhash_1word(ntohl(iph->saddr),
270 config->hash_initval);
271 break;
272 case CLUSTERIP_HASHMODE_SIP_SPT:
273 hashval = jhash_2words(ntohl(iph->saddr), sport,
274 config->hash_initval);
275 break;
276 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
277 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
278 config->hash_initval);
279 break;
280 default:
281 /* to make gcc happy */
282 hashval = 0;
283 /* This cannot happen, unless the check function wasn't called
284 * at rule load time */
285 printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
286 BUG();
287 break;
288 }
289
290 /* node numbers are 1..n, not 0..n */
291 return ((hashval % config->num_total_nodes)+1);
292 }
293
294 static inline int
295 clusterip_responsible(struct clusterip_config *config, u_int32_t hash)
296 {
297 return test_bit(hash - 1, &config->local_nodes);
298 }
299
300 /***********************************************************************
301 * IPTABLES TARGET
302 ***********************************************************************/
303
304 static unsigned int
305 target(struct sk_buff **pskb,
306 const struct net_device *in,
307 const struct net_device *out,
308 unsigned int hooknum,
309 const struct xt_target *target,
310 const void *targinfo)
311 {
312 const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
313 enum ip_conntrack_info ctinfo;
314 u_int32_t *mark, hash;
315
316 /* don't need to clusterip_config_get() here, since refcount
317 * is only decremented by destroy() - and ip_tables guarantees
318 * that the ->target() function isn't called after ->destroy() */
319
320 mark = nf_ct_get_mark((*pskb), &ctinfo);
321 if (mark == NULL) {
322 printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
323 /* FIXME: need to drop invalid ones, since replies
324 * to outgoing connections of other nodes will be
325 * marked as INVALID */
326 return NF_DROP;
327 }
328
329 /* special case: ICMP error handling. conntrack distinguishes between
330 * error messages (RELATED) and information requests (see below) */
331 if (ip_hdr(*pskb)->protocol == IPPROTO_ICMP
332 && (ctinfo == IP_CT_RELATED
333 || ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
334 return XT_CONTINUE;
335
336 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
337 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
338 * on, which all have an ID field [relevant for hashing]. */
339
340 hash = clusterip_hashfn(*pskb, cipinfo->config);
341
342 switch (ctinfo) {
343 case IP_CT_NEW:
344 *mark = hash;
345 break;
346 case IP_CT_RELATED:
347 case IP_CT_RELATED+IP_CT_IS_REPLY:
348 /* FIXME: we don't handle expectations at the
349 * moment. they can arrive on a different node than
350 * the master connection (e.g. FTP passive mode) */
351 case IP_CT_ESTABLISHED:
352 case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
353 break;
354 default:
355 break;
356 }
357
358 #ifdef DEBUG_CLUSTERP
359 DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
360 #endif
361 DEBUGP("hash=%u ct_hash=%u ", hash, *mark);
362 if (!clusterip_responsible(cipinfo->config, hash)) {
363 DEBUGP("not responsible\n");
364 return NF_DROP;
365 }
366 DEBUGP("responsible\n");
367
368 /* despite being received via linklayer multicast, this is
369 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
370 (*pskb)->pkt_type = PACKET_HOST;
371
372 return XT_CONTINUE;
373 }
374
375 static int
376 checkentry(const char *tablename,
377 const void *e_void,
378 const struct xt_target *target,
379 void *targinfo,
380 unsigned int hook_mask)
381 {
382 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
383 const struct ipt_entry *e = e_void;
384
385 struct clusterip_config *config;
386
387 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
388 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
389 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
390 printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
391 cipinfo->hash_mode);
392 return 0;
393
394 }
395 if (e->ip.dmsk.s_addr != htonl(0xffffffff)
396 || e->ip.dst.s_addr == 0) {
397 printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
398 return 0;
399 }
400
401 /* FIXME: further sanity checks */
402
403 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
404 if (config) {
405 if (cipinfo->config != NULL) {
406 /* Case A: This is an entry that gets reloaded, since
407 * it still has a cipinfo->config pointer. Simply
408 * increase the entry refcount and return */
409 if (cipinfo->config != config) {
410 printk(KERN_ERR "CLUSTERIP: Reloaded entry "
411 "has invalid config pointer!\n");
412 return 0;
413 }
414 } else {
415 /* Case B: This is a new rule referring to an existing
416 * clusterip config. */
417 cipinfo->config = config;
418 }
419 } else {
420 /* Case C: This is a completely new clusterip config */
421 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
422 printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
423 return 0;
424 } else {
425 struct net_device *dev;
426
427 if (e->ip.iniface[0] == '\0') {
428 printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
429 return 0;
430 }
431
432 dev = dev_get_by_name(e->ip.iniface);
433 if (!dev) {
434 printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
435 return 0;
436 }
437
438 config = clusterip_config_init(cipinfo,
439 e->ip.dst.s_addr, dev);
440 if (!config) {
441 printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
442 dev_put(dev);
443 return 0;
444 }
445 dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
446 }
447 cipinfo->config = config;
448 }
449
450 if (nf_ct_l3proto_try_module_get(target->family) < 0) {
451 printk(KERN_WARNING "can't load conntrack support for "
452 "proto=%d\n", target->family);
453 return 0;
454 }
455
456 return 1;
457 }
458
459 /* drop reference count of cluster config when rule is deleted */
460 static void destroy(const struct xt_target *target, void *targinfo)
461 {
462 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
463
464 /* if no more entries are referencing the config, remove it
465 * from the list and destroy the proc entry */
466 clusterip_config_entry_put(cipinfo->config);
467
468 clusterip_config_put(cipinfo->config);
469
470 nf_ct_l3proto_module_put(target->family);
471 }
472
473 static struct xt_target clusterip_tgt = {
474 .name = "CLUSTERIP",
475 .family = AF_INET,
476 .target = target,
477 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
478 .checkentry = checkentry,
479 .destroy = destroy,
480 .me = THIS_MODULE
481 };
482
483
484 /***********************************************************************
485 * ARP MANGLING CODE
486 ***********************************************************************/
487
488 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
489 struct arp_payload {
490 u_int8_t src_hw[ETH_ALEN];
491 __be32 src_ip;
492 u_int8_t dst_hw[ETH_ALEN];
493 __be32 dst_ip;
494 } __attribute__ ((packed));
495
496 #ifdef CLUSTERIP_DEBUG
497 static void arp_print(struct arp_payload *payload)
498 {
499 #define HBUFFERLEN 30
500 char hbuffer[HBUFFERLEN];
501 int j,k;
502 const char hexbuf[]= "0123456789abcdef";
503
504 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
505 hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
506 hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
507 hbuffer[k++]=':';
508 }
509 hbuffer[--k]='\0';
510
511 printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n",
512 NIPQUAD(payload->src_ip), hbuffer,
513 NIPQUAD(payload->dst_ip));
514 }
515 #endif
516
517 static unsigned int
518 arp_mangle(unsigned int hook,
519 struct sk_buff **pskb,
520 const struct net_device *in,
521 const struct net_device *out,
522 int (*okfn)(struct sk_buff *))
523 {
524 struct arphdr *arp = (*pskb)->nh.arph;
525 struct arp_payload *payload;
526 struct clusterip_config *c;
527
528 /* we don't care about non-ethernet and non-ipv4 ARP */
529 if (arp->ar_hrd != htons(ARPHRD_ETHER)
530 || arp->ar_pro != htons(ETH_P_IP)
531 || arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
532 return NF_ACCEPT;
533
534 /* we only want to mangle arp requests and replies */
535 if (arp->ar_op != htons(ARPOP_REPLY)
536 && arp->ar_op != htons(ARPOP_REQUEST))
537 return NF_ACCEPT;
538
539 payload = (void *)(arp+1);
540
541 /* if there is no clusterip configuration for the arp reply's
542 * source ip, we don't want to mangle it */
543 c = clusterip_config_find_get(payload->src_ip, 0);
544 if (!c)
545 return NF_ACCEPT;
546
547 /* normally the linux kernel always replies to arp queries of
548 * addresses on different interfacs. However, in the CLUSTERIP case
549 * this wouldn't work, since we didn't subscribe the mcast group on
550 * other interfaces */
551 if (c->dev != out) {
552 DEBUGP("CLUSTERIP: not mangling arp reply on different "
553 "interface: cip'%s'-skb'%s'\n", c->dev->name, out->name);
554 clusterip_config_put(c);
555 return NF_ACCEPT;
556 }
557
558 /* mangle reply hardware address */
559 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
560
561 #ifdef CLUSTERIP_DEBUG
562 DEBUGP(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
563 arp_print(payload);
564 #endif
565
566 clusterip_config_put(c);
567
568 return NF_ACCEPT;
569 }
570
571 static struct nf_hook_ops cip_arp_ops = {
572 .hook = arp_mangle,
573 .pf = NF_ARP,
574 .hooknum = NF_ARP_OUT,
575 .priority = -1
576 };
577
578 /***********************************************************************
579 * PROC DIR HANDLING
580 ***********************************************************************/
581
582 #ifdef CONFIG_PROC_FS
583
584 struct clusterip_seq_position {
585 unsigned int pos; /* position */
586 unsigned int weight; /* number of bits set == size */
587 unsigned int bit; /* current bit */
588 unsigned long val; /* current value */
589 };
590
591 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
592 {
593 struct proc_dir_entry *pde = s->private;
594 struct clusterip_config *c = pde->data;
595 unsigned int weight;
596 u_int32_t local_nodes;
597 struct clusterip_seq_position *idx;
598
599 /* FIXME: possible race */
600 local_nodes = c->local_nodes;
601 weight = hweight32(local_nodes);
602 if (*pos >= weight)
603 return NULL;
604
605 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
606 if (!idx)
607 return ERR_PTR(-ENOMEM);
608
609 idx->pos = *pos;
610 idx->weight = weight;
611 idx->bit = ffs(local_nodes);
612 idx->val = local_nodes;
613 clear_bit(idx->bit - 1, &idx->val);
614
615 return idx;
616 }
617
618 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
619 {
620 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
621
622 *pos = ++idx->pos;
623 if (*pos >= idx->weight) {
624 kfree(v);
625 return NULL;
626 }
627 idx->bit = ffs(idx->val);
628 clear_bit(idx->bit - 1, &idx->val);
629 return idx;
630 }
631
632 static void clusterip_seq_stop(struct seq_file *s, void *v)
633 {
634 kfree(v);
635 }
636
637 static int clusterip_seq_show(struct seq_file *s, void *v)
638 {
639 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
640
641 if (idx->pos != 0)
642 seq_putc(s, ',');
643
644 seq_printf(s, "%u", idx->bit);
645
646 if (idx->pos == idx->weight - 1)
647 seq_putc(s, '\n');
648
649 return 0;
650 }
651
652 static struct seq_operations clusterip_seq_ops = {
653 .start = clusterip_seq_start,
654 .next = clusterip_seq_next,
655 .stop = clusterip_seq_stop,
656 .show = clusterip_seq_show,
657 };
658
659 static int clusterip_proc_open(struct inode *inode, struct file *file)
660 {
661 int ret = seq_open(file, &clusterip_seq_ops);
662
663 if (!ret) {
664 struct seq_file *sf = file->private_data;
665 struct proc_dir_entry *pde = PDE(inode);
666 struct clusterip_config *c = pde->data;
667
668 sf->private = pde;
669
670 clusterip_config_get(c);
671 }
672
673 return ret;
674 }
675
676 static int clusterip_proc_release(struct inode *inode, struct file *file)
677 {
678 struct proc_dir_entry *pde = PDE(inode);
679 struct clusterip_config *c = pde->data;
680 int ret;
681
682 ret = seq_release(inode, file);
683
684 if (!ret)
685 clusterip_config_put(c);
686
687 return ret;
688 }
689
690 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
691 size_t size, loff_t *ofs)
692 {
693 #define PROC_WRITELEN 10
694 char buffer[PROC_WRITELEN+1];
695 struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
696 struct clusterip_config *c = pde->data;
697 unsigned long nodenum;
698
699 if (copy_from_user(buffer, input, PROC_WRITELEN))
700 return -EFAULT;
701
702 if (*buffer == '+') {
703 nodenum = simple_strtoul(buffer+1, NULL, 10);
704 if (clusterip_add_node(c, nodenum))
705 return -ENOMEM;
706 } else if (*buffer == '-') {
707 nodenum = simple_strtoul(buffer+1, NULL,10);
708 if (clusterip_del_node(c, nodenum))
709 return -ENOENT;
710 } else
711 return -EIO;
712
713 return size;
714 }
715
716 static const struct file_operations clusterip_proc_fops = {
717 .owner = THIS_MODULE,
718 .open = clusterip_proc_open,
719 .read = seq_read,
720 .write = clusterip_proc_write,
721 .llseek = seq_lseek,
722 .release = clusterip_proc_release,
723 };
724
725 #endif /* CONFIG_PROC_FS */
726
727 static int __init ipt_clusterip_init(void)
728 {
729 int ret;
730
731 ret = xt_register_target(&clusterip_tgt);
732 if (ret < 0)
733 return ret;
734
735 ret = nf_register_hook(&cip_arp_ops);
736 if (ret < 0)
737 goto cleanup_target;
738
739 #ifdef CONFIG_PROC_FS
740 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", proc_net);
741 if (!clusterip_procdir) {
742 printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
743 ret = -ENOMEM;
744 goto cleanup_hook;
745 }
746 #endif /* CONFIG_PROC_FS */
747
748 printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
749 CLUSTERIP_VERSION);
750 return 0;
751
752 #ifdef CONFIG_PROC_FS
753 cleanup_hook:
754 nf_unregister_hook(&cip_arp_ops);
755 #endif /* CONFIG_PROC_FS */
756 cleanup_target:
757 xt_unregister_target(&clusterip_tgt);
758 return ret;
759 }
760
761 static void __exit ipt_clusterip_fini(void)
762 {
763 printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
764 CLUSTERIP_VERSION);
765 #ifdef CONFIG_PROC_FS
766 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
767 #endif
768 nf_unregister_hook(&cip_arp_ops);
769 xt_unregister_target(&clusterip_tgt);
770 }
771
772 module_init(ipt_clusterip_init);
773 module_exit(ipt_clusterip_fini);