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[NETFILTER]: x_tables: remove unused size argument to check/destroy functions
[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 #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_ipv4/ip_tables.h>
30 #include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
31 #include <net/netfilter/nf_conntrack_compat.h>
32
33 #define CLUSTERIP_VERSION "0.8"
34
35 #define DEBUG_CLUSTERIP
36
37 #ifdef DEBUG_CLUSTERIP
38 #define DEBUGP printk
39 #else
40 #define DEBUGP
41 #endif
42
43 #define ASSERT_READ_LOCK(x)
44
45 MODULE_LICENSE("GPL");
46 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
47 MODULE_DESCRIPTION("iptables target for CLUSTERIP");
48
49 struct clusterip_config {
50 struct list_head list; /* list of all configs */
51 atomic_t refcount; /* reference count */
52 atomic_t entries; /* number of entries/rules
53 * referencing us */
54
55 u_int32_t clusterip; /* the IP address */
56 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
57 struct net_device *dev; /* device */
58 u_int16_t num_total_nodes; /* total number of nodes */
59 unsigned long local_nodes; /* node number array */
60
61 #ifdef CONFIG_PROC_FS
62 struct proc_dir_entry *pde; /* proc dir entry */
63 #endif
64 enum clusterip_hashmode hash_mode; /* which hashing mode */
65 u_int32_t hash_initval; /* hash initialization */
66 };
67
68 static LIST_HEAD(clusterip_configs);
69
70 /* clusterip_lock protects the clusterip_configs list */
71 static DEFINE_RWLOCK(clusterip_lock);
72
73 #ifdef CONFIG_PROC_FS
74 static struct file_operations clusterip_proc_fops;
75 static struct proc_dir_entry *clusterip_procdir;
76 #endif
77
78 static inline void
79 clusterip_config_get(struct clusterip_config *c)
80 {
81 atomic_inc(&c->refcount);
82 }
83
84 static inline void
85 clusterip_config_put(struct clusterip_config *c)
86 {
87 if (atomic_dec_and_test(&c->refcount))
88 kfree(c);
89 }
90
91 /* increase the count of entries(rules) using/referencing this config */
92 static inline void
93 clusterip_config_entry_get(struct clusterip_config *c)
94 {
95 atomic_inc(&c->entries);
96 }
97
98 /* decrease the count of entries using/referencing this config. If last
99 * entry(rule) is removed, remove the config from lists, but don't free it
100 * yet, since proc-files could still be holding references */
101 static inline void
102 clusterip_config_entry_put(struct clusterip_config *c)
103 {
104 if (atomic_dec_and_test(&c->entries)) {
105 write_lock_bh(&clusterip_lock);
106 list_del(&c->list);
107 write_unlock_bh(&clusterip_lock);
108
109 dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
110 dev_put(c->dev);
111
112 /* In case anyone still accesses the file, the open/close
113 * functions are also incrementing the refcount on their own,
114 * so it's safe to remove the entry even if it's in use. */
115 #ifdef CONFIG_PROC_FS
116 remove_proc_entry(c->pde->name, c->pde->parent);
117 #endif
118 }
119 }
120
121 static struct clusterip_config *
122 __clusterip_config_find(u_int32_t clusterip)
123 {
124 struct list_head *pos;
125
126 ASSERT_READ_LOCK(&clusterip_lock);
127 list_for_each(pos, &clusterip_configs) {
128 struct clusterip_config *c = list_entry(pos,
129 struct clusterip_config, list);
130 if (c->clusterip == clusterip) {
131 return c;
132 }
133 }
134
135 return NULL;
136 }
137
138 static inline struct clusterip_config *
139 clusterip_config_find_get(u_int32_t clusterip, int entry)
140 {
141 struct clusterip_config *c;
142
143 read_lock_bh(&clusterip_lock);
144 c = __clusterip_config_find(clusterip);
145 if (!c) {
146 read_unlock_bh(&clusterip_lock);
147 return NULL;
148 }
149 atomic_inc(&c->refcount);
150 if (entry)
151 atomic_inc(&c->entries);
152 read_unlock_bh(&clusterip_lock);
153
154 return c;
155 }
156
157 static void
158 clusterip_config_init_nodelist(struct clusterip_config *c,
159 const struct ipt_clusterip_tgt_info *i)
160 {
161 int n;
162
163 for (n = 0; n < i->num_local_nodes; n++) {
164 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
165 }
166 }
167
168 static struct clusterip_config *
169 clusterip_config_init(struct ipt_clusterip_tgt_info *i, u_int32_t ip,
170 struct net_device *dev)
171 {
172 struct clusterip_config *c;
173 char buffer[16];
174
175 c = kzalloc(sizeof(*c), GFP_ATOMIC);
176 if (!c)
177 return NULL;
178
179 c->dev = dev;
180 c->clusterip = ip;
181 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
182 c->num_total_nodes = i->num_total_nodes;
183 clusterip_config_init_nodelist(c, i);
184 c->hash_mode = i->hash_mode;
185 c->hash_initval = i->hash_initval;
186 atomic_set(&c->refcount, 1);
187 atomic_set(&c->entries, 1);
188
189 #ifdef CONFIG_PROC_FS
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, clusterip_procdir);
193 if (!c->pde) {
194 kfree(c);
195 return NULL;
196 }
197 c->pde->proc_fops = &clusterip_proc_fops;
198 c->pde->data = c;
199 #endif
200
201 write_lock_bh(&clusterip_lock);
202 list_add(&c->list, &clusterip_configs);
203 write_unlock_bh(&clusterip_lock);
204
205 return c;
206 }
207
208 static int
209 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
210 {
211
212 if (nodenum == 0 ||
213 nodenum > c->num_total_nodes)
214 return 1;
215
216 /* check if we already have this number in our bitfield */
217 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
218 return 1;
219
220 return 0;
221 }
222
223 static int
224 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
225 {
226 if (nodenum == 0 ||
227 nodenum > c->num_total_nodes)
228 return 1;
229
230 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
231 return 0;
232
233 return 1;
234 }
235
236 static inline u_int32_t
237 clusterip_hashfn(struct sk_buff *skb, struct clusterip_config *config)
238 {
239 struct iphdr *iph = skb->nh.iph;
240 unsigned long hashval;
241 u_int16_t sport, dport;
242 u_int16_t *ports;
243
244 switch (iph->protocol) {
245 case IPPROTO_TCP:
246 case IPPROTO_UDP:
247 case IPPROTO_SCTP:
248 case IPPROTO_DCCP:
249 case IPPROTO_ICMP:
250 ports = (void *)iph+iph->ihl*4;
251 sport = ports[0];
252 dport = ports[1];
253 break;
254 default:
255 if (net_ratelimit()) {
256 printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
257 iph->protocol);
258 }
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(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 enum ip_conntrack_info ctinfo;
309 u_int32_t *mark, hash;
310
311 /* don't need to clusterip_config_get() here, since refcount
312 * is only decremented by destroy() - and ip_tables guarantees
313 * that the ->target() function isn't called after ->destroy() */
314
315 mark = nf_ct_get_mark((*pskb), &ctinfo);
316 if (mark == NULL) {
317 printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
318 /* FIXME: need to drop invalid ones, since replies
319 * to outgoing connections of other nodes will be
320 * marked as INVALID */
321 return NF_DROP;
322 }
323
324 /* special case: ICMP error handling. conntrack distinguishes between
325 * error messages (RELATED) and information requests (see below) */
326 if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP
327 && (ctinfo == IP_CT_RELATED
328 || ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
329 return IPT_CONTINUE;
330
331 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
332 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
333 * on, which all have an ID field [relevant for hashing]. */
334
335 hash = clusterip_hashfn(*pskb, cipinfo->config);
336
337 switch (ctinfo) {
338 case IP_CT_NEW:
339 *mark = hash;
340 break;
341 case IP_CT_RELATED:
342 case IP_CT_RELATED+IP_CT_IS_REPLY:
343 /* FIXME: we don't handle expectations at the
344 * moment. they can arrive on a different node than
345 * the master connection (e.g. FTP passive mode) */
346 case IP_CT_ESTABLISHED:
347 case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
348 break;
349 default:
350 break;
351 }
352
353 #ifdef DEBUG_CLUSTERP
354 DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
355 #endif
356 DEBUGP("hash=%u ct_hash=%u ", hash, *mark);
357 if (!clusterip_responsible(cipinfo->config, hash)) {
358 DEBUGP("not responsible\n");
359 return NF_DROP;
360 }
361 DEBUGP("responsible\n");
362
363 /* despite being received via linklayer multicast, this is
364 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
365 (*pskb)->pkt_type = PACKET_HOST;
366
367 return IPT_CONTINUE;
368 }
369
370 static int
371 checkentry(const char *tablename,
372 const void *e_void,
373 const struct xt_target *target,
374 void *targinfo,
375 unsigned int hook_mask)
376 {
377 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
378 const struct ipt_entry *e = e_void;
379
380 struct clusterip_config *config;
381
382 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
383 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
384 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
385 printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
386 cipinfo->hash_mode);
387 return 0;
388
389 }
390 if (e->ip.dmsk.s_addr != 0xffffffff
391 || e->ip.dst.s_addr == 0) {
392 printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
393 return 0;
394 }
395
396 /* FIXME: further sanity checks */
397
398 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
399 if (config) {
400 if (cipinfo->config != NULL) {
401 /* Case A: This is an entry that gets reloaded, since
402 * it still has a cipinfo->config pointer. Simply
403 * increase the entry refcount and return */
404 if (cipinfo->config != config) {
405 printk(KERN_ERR "CLUSTERIP: Reloaded entry "
406 "has invalid config pointer!\n");
407 return 0;
408 }
409 clusterip_config_entry_get(cipinfo->config);
410 } else {
411 /* Case B: This is a new rule referring to an existing
412 * clusterip config. */
413 cipinfo->config = config;
414 clusterip_config_entry_get(cipinfo->config);
415 }
416 } else {
417 /* Case C: This is a completely new clusterip config */
418 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
419 printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
420 return 0;
421 } else {
422 struct net_device *dev;
423
424 if (e->ip.iniface[0] == '\0') {
425 printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
426 return 0;
427 }
428
429 dev = dev_get_by_name(e->ip.iniface);
430 if (!dev) {
431 printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
432 return 0;
433 }
434
435 config = clusterip_config_init(cipinfo,
436 e->ip.dst.s_addr, dev);
437 if (!config) {
438 printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
439 dev_put(dev);
440 return 0;
441 }
442 dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
443 }
444 cipinfo->config = config;
445 }
446
447 return 1;
448 }
449
450 /* drop reference count of cluster config when rule is deleted */
451 static void destroy(const struct xt_target *target, void *targinfo)
452 {
453 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
454
455 /* if no more entries are referencing the config, remove it
456 * from the list and destroy the proc entry */
457 clusterip_config_entry_put(cipinfo->config);
458
459 clusterip_config_put(cipinfo->config);
460 }
461
462 static struct ipt_target clusterip_tgt = {
463 .name = "CLUSTERIP",
464 .target = target,
465 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
466 .checkentry = checkentry,
467 .destroy = destroy,
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 u_int32_t src_ip;
480 u_int8_t dst_hw[ETH_ALEN];
481 u_int32_t dst_ip;
482 } __attribute__ ((packed));
483
484 #ifdef CLUSTERIP_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 = (*pskb)->nh.arph;
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 DEBUGP("CLUSTERIP: not mangling arp reply on different "
541 "interface: cip'%s'-skb'%s'\n", c->dev->name, out->name);
542 clusterip_config_put(c);
543 return NF_ACCEPT;
544 }
545
546 /* mangle reply hardware address */
547 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
548
549 #ifdef CLUSTERIP_DEBUG
550 DEBUGP(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
551 arp_print(payload);
552 #endif
553
554 clusterip_config_put(c);
555
556 return NF_ACCEPT;
557 }
558
559 static struct nf_hook_ops cip_arp_ops = {
560 .hook = arp_mangle,
561 .pf = NF_ARP,
562 .hooknum = NF_ARP_OUT,
563 .priority = -1
564 };
565
566 /***********************************************************************
567 * PROC DIR HANDLING
568 ***********************************************************************/
569
570 #ifdef CONFIG_PROC_FS
571
572 struct clusterip_seq_position {
573 unsigned int pos; /* position */
574 unsigned int weight; /* number of bits set == size */
575 unsigned int bit; /* current bit */
576 unsigned long val; /* current value */
577 };
578
579 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
580 {
581 struct proc_dir_entry *pde = s->private;
582 struct clusterip_config *c = pde->data;
583 unsigned int weight;
584 u_int32_t local_nodes;
585 struct clusterip_seq_position *idx;
586
587 /* FIXME: possible race */
588 local_nodes = c->local_nodes;
589 weight = hweight32(local_nodes);
590 if (*pos >= weight)
591 return NULL;
592
593 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
594 if (!idx)
595 return ERR_PTR(-ENOMEM);
596
597 idx->pos = *pos;
598 idx->weight = weight;
599 idx->bit = ffs(local_nodes);
600 idx->val = local_nodes;
601 clear_bit(idx->bit - 1, &idx->val);
602
603 return idx;
604 }
605
606 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
607 {
608 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
609
610 *pos = ++idx->pos;
611 if (*pos >= idx->weight) {
612 kfree(v);
613 return NULL;
614 }
615 idx->bit = ffs(idx->val);
616 clear_bit(idx->bit - 1, &idx->val);
617 return idx;
618 }
619
620 static void clusterip_seq_stop(struct seq_file *s, void *v)
621 {
622 kfree(v);
623 }
624
625 static int clusterip_seq_show(struct seq_file *s, void *v)
626 {
627 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
628
629 if (idx->pos != 0)
630 seq_putc(s, ',');
631
632 seq_printf(s, "%u", idx->bit);
633
634 if (idx->pos == idx->weight - 1)
635 seq_putc(s, '\n');
636
637 return 0;
638 }
639
640 static struct seq_operations clusterip_seq_ops = {
641 .start = clusterip_seq_start,
642 .next = clusterip_seq_next,
643 .stop = clusterip_seq_stop,
644 .show = clusterip_seq_show,
645 };
646
647 static int clusterip_proc_open(struct inode *inode, struct file *file)
648 {
649 int ret = seq_open(file, &clusterip_seq_ops);
650
651 if (!ret) {
652 struct seq_file *sf = file->private_data;
653 struct proc_dir_entry *pde = PDE(inode);
654 struct clusterip_config *c = pde->data;
655
656 sf->private = pde;
657
658 clusterip_config_get(c);
659 }
660
661 return ret;
662 }
663
664 static int clusterip_proc_release(struct inode *inode, struct file *file)
665 {
666 struct proc_dir_entry *pde = PDE(inode);
667 struct clusterip_config *c = pde->data;
668 int ret;
669
670 ret = seq_release(inode, file);
671
672 if (!ret)
673 clusterip_config_put(c);
674
675 return ret;
676 }
677
678 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
679 size_t size, loff_t *ofs)
680 {
681 #define PROC_WRITELEN 10
682 char buffer[PROC_WRITELEN+1];
683 struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode);
684 struct clusterip_config *c = pde->data;
685 unsigned long nodenum;
686
687 if (copy_from_user(buffer, input, PROC_WRITELEN))
688 return -EFAULT;
689
690 if (*buffer == '+') {
691 nodenum = simple_strtoul(buffer+1, NULL, 10);
692 if (clusterip_add_node(c, nodenum))
693 return -ENOMEM;
694 } else if (*buffer == '-') {
695 nodenum = simple_strtoul(buffer+1, NULL,10);
696 if (clusterip_del_node(c, nodenum))
697 return -ENOENT;
698 } else
699 return -EIO;
700
701 return size;
702 }
703
704 static struct file_operations clusterip_proc_fops = {
705 .owner = THIS_MODULE,
706 .open = clusterip_proc_open,
707 .read = seq_read,
708 .write = clusterip_proc_write,
709 .llseek = seq_lseek,
710 .release = clusterip_proc_release,
711 };
712
713 #endif /* CONFIG_PROC_FS */
714
715 static int __init ipt_clusterip_init(void)
716 {
717 int ret;
718
719 ret = ipt_register_target(&clusterip_tgt);
720 if (ret < 0)
721 return ret;
722
723 ret = nf_register_hook(&cip_arp_ops);
724 if (ret < 0)
725 goto cleanup_target;
726
727 #ifdef CONFIG_PROC_FS
728 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", proc_net);
729 if (!clusterip_procdir) {
730 printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
731 ret = -ENOMEM;
732 goto cleanup_hook;
733 }
734 #endif /* CONFIG_PROC_FS */
735
736 printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
737 CLUSTERIP_VERSION);
738 return 0;
739
740 cleanup_hook:
741 nf_unregister_hook(&cip_arp_ops);
742 cleanup_target:
743 ipt_unregister_target(&clusterip_tgt);
744 return ret;
745 }
746
747 static void __exit ipt_clusterip_fini(void)
748 {
749 printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
750 CLUSTERIP_VERSION);
751 #ifdef CONFIG_PROC_FS
752 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
753 #endif
754 nf_unregister_hook(&cip_arp_ops);
755 ipt_unregister_target(&clusterip_tgt);
756 }
757
758 module_init(ipt_clusterip_init);
759 module_exit(ipt_clusterip_fini);
Linux kernel - Deliverables
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