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Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/ralf/upstrea...
[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/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/net_namespace.h>
29 #include <net/checksum.h>
30
31 #define CLUSTERIP_VERSION "0.8"
32
33 MODULE_LICENSE("GPL");
34 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
35 MODULE_DESCRIPTION("Xtables: CLUSTERIP target");
36
37 struct clusterip_config {
38 struct list_head list; /* list of all configs */
39 atomic_t refcount; /* reference count */
40 atomic_t entries; /* number of entries/rules
41 * referencing us */
42
43 __be32 clusterip; /* the IP address */
44 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
45 struct net_device *dev; /* device */
46 u_int16_t num_total_nodes; /* total number of nodes */
47 unsigned long local_nodes; /* node number array */
48
49 #ifdef CONFIG_PROC_FS
50 struct proc_dir_entry *pde; /* proc dir entry */
51 #endif
52 enum clusterip_hashmode hash_mode; /* which hashing mode */
53 u_int32_t hash_initval; /* hash initialization */
54 };
55
56 static LIST_HEAD(clusterip_configs);
57
58 /* clusterip_lock protects the clusterip_configs list */
59 static DEFINE_RWLOCK(clusterip_lock);
60
61 #ifdef CONFIG_PROC_FS
62 static const struct file_operations clusterip_proc_fops;
63 static struct proc_dir_entry *clusterip_procdir;
64 #endif
65
66 static inline void
67 clusterip_config_get(struct clusterip_config *c)
68 {
69 atomic_inc(&c->refcount);
70 }
71
72 static inline void
73 clusterip_config_put(struct clusterip_config *c)
74 {
75 if (atomic_dec_and_test(&c->refcount))
76 kfree(c);
77 }
78
79 /* decrease the count of entries using/referencing this config. If last
80 * entry(rule) is removed, remove the config from lists, but don't free it
81 * yet, since proc-files could still be holding references */
82 static inline void
83 clusterip_config_entry_put(struct clusterip_config *c)
84 {
85 if (atomic_dec_and_test(&c->entries)) {
86 write_lock_bh(&clusterip_lock);
87 list_del(&c->list);
88 write_unlock_bh(&clusterip_lock);
89
90 dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
91 dev_put(c->dev);
92
93 /* In case anyone still accesses the file, the open/close
94 * functions are also incrementing the refcount on their own,
95 * so it's safe to remove the entry even if it's in use. */
96 #ifdef CONFIG_PROC_FS
97 remove_proc_entry(c->pde->name, c->pde->parent);
98 #endif
99 }
100 }
101
102 static struct clusterip_config *
103 __clusterip_config_find(__be32 clusterip)
104 {
105 struct clusterip_config *c;
106
107 list_for_each_entry(c, &clusterip_configs, list) {
108 if (c->clusterip == clusterip)
109 return c;
110 }
111
112 return NULL;
113 }
114
115 static inline struct clusterip_config *
116 clusterip_config_find_get(__be32 clusterip, int entry)
117 {
118 struct clusterip_config *c;
119
120 read_lock_bh(&clusterip_lock);
121 c = __clusterip_config_find(clusterip);
122 if (!c) {
123 read_unlock_bh(&clusterip_lock);
124 return NULL;
125 }
126 atomic_inc(&c->refcount);
127 if (entry)
128 atomic_inc(&c->entries);
129 read_unlock_bh(&clusterip_lock);
130
131 return c;
132 }
133
134 static void
135 clusterip_config_init_nodelist(struct clusterip_config *c,
136 const struct ipt_clusterip_tgt_info *i)
137 {
138 int n;
139
140 for (n = 0; n < i->num_local_nodes; n++)
141 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
142 }
143
144 static struct clusterip_config *
145 clusterip_config_init(struct ipt_clusterip_tgt_info *i, __be32 ip,
146 struct net_device *dev)
147 {
148 struct clusterip_config *c;
149
150 c = kzalloc(sizeof(*c), GFP_ATOMIC);
151 if (!c)
152 return NULL;
153
154 c->dev = dev;
155 c->clusterip = ip;
156 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
157 c->num_total_nodes = i->num_total_nodes;
158 clusterip_config_init_nodelist(c, i);
159 c->hash_mode = i->hash_mode;
160 c->hash_initval = i->hash_initval;
161 atomic_set(&c->refcount, 1);
162 atomic_set(&c->entries, 1);
163
164 #ifdef CONFIG_PROC_FS
165 {
166 char buffer[16];
167
168 /* create proc dir entry */
169 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
170 c->pde = proc_create(buffer, S_IWUSR|S_IRUSR,
171 clusterip_procdir, &clusterip_proc_fops);
172 if (!c->pde) {
173 kfree(c);
174 return NULL;
175 }
176 }
177 c->pde->data = c;
178 #endif
179
180 write_lock_bh(&clusterip_lock);
181 list_add(&c->list, &clusterip_configs);
182 write_unlock_bh(&clusterip_lock);
183
184 return c;
185 }
186
187 #ifdef CONFIG_PROC_FS
188 static int
189 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
190 {
191
192 if (nodenum == 0 ||
193 nodenum > c->num_total_nodes)
194 return 1;
195
196 /* check if we already have this number in our bitfield */
197 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
198 return 1;
199
200 return 0;
201 }
202
203 static bool
204 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
205 {
206 if (nodenum == 0 ||
207 nodenum > c->num_total_nodes)
208 return true;
209
210 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
211 return false;
212
213 return true;
214 }
215 #endif
216
217 static inline u_int32_t
218 clusterip_hashfn(const struct sk_buff *skb,
219 const struct clusterip_config *config)
220 {
221 const struct iphdr *iph = ip_hdr(skb);
222 unsigned long hashval;
223 u_int16_t sport, dport;
224 const u_int16_t *ports;
225
226 switch (iph->protocol) {
227 case IPPROTO_TCP:
228 case IPPROTO_UDP:
229 case IPPROTO_UDPLITE:
230 case IPPROTO_SCTP:
231 case IPPROTO_DCCP:
232 case IPPROTO_ICMP:
233 ports = (const void *)iph+iph->ihl*4;
234 sport = ports[0];
235 dport = ports[1];
236 break;
237 default:
238 if (net_ratelimit())
239 printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
240 iph->protocol);
241 sport = dport = 0;
242 }
243
244 switch (config->hash_mode) {
245 case CLUSTERIP_HASHMODE_SIP:
246 hashval = jhash_1word(ntohl(iph->saddr),
247 config->hash_initval);
248 break;
249 case CLUSTERIP_HASHMODE_SIP_SPT:
250 hashval = jhash_2words(ntohl(iph->saddr), sport,
251 config->hash_initval);
252 break;
253 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
254 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
255 config->hash_initval);
256 break;
257 default:
258 /* to make gcc happy */
259 hashval = 0;
260 /* This cannot happen, unless the check function wasn't called
261 * at rule load time */
262 printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
263 BUG();
264 break;
265 }
266
267 /* node numbers are 1..n, not 0..n */
268 return (((u64)hashval * config->num_total_nodes) >> 32) + 1;
269 }
270
271 static inline int
272 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
273 {
274 return test_bit(hash - 1, &config->local_nodes);
275 }
276
277 /***********************************************************************
278 * IPTABLES TARGET
279 ***********************************************************************/
280
281 static unsigned int
282 clusterip_tg(struct sk_buff *skb, const struct net_device *in,
283 const struct net_device *out, unsigned int hooknum,
284 const struct xt_target *target, const void *targinfo)
285 {
286 const struct ipt_clusterip_tgt_info *cipinfo = 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 printk(KERN_ERR "CLUSTERIP: 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 DUMP_TUPLE(&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 bool
351 clusterip_tg_check(const char *tablename, const void *e_void,
352 const struct xt_target *target, void *targinfo,
353 unsigned int hook_mask)
354 {
355 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
356 const struct ipt_entry *e = e_void;
357
358 struct clusterip_config *config;
359
360 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
361 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
362 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
363 printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
364 cipinfo->hash_mode);
365 return false;
366
367 }
368 if (e->ip.dmsk.s_addr != htonl(0xffffffff)
369 || e->ip.dst.s_addr == 0) {
370 printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
371 return false;
372 }
373
374 /* FIXME: further sanity checks */
375
376 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
377 if (!config) {
378 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
379 printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
380 return false;
381 } else {
382 struct net_device *dev;
383
384 if (e->ip.iniface[0] == '\0') {
385 printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
386 return false;
387 }
388
389 dev = dev_get_by_name(&init_net, e->ip.iniface);
390 if (!dev) {
391 printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
392 return false;
393 }
394
395 config = clusterip_config_init(cipinfo,
396 e->ip.dst.s_addr, dev);
397 if (!config) {
398 printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
399 dev_put(dev);
400 return false;
401 }
402 dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
403 }
404 }
405 cipinfo->config = config;
406
407 if (nf_ct_l3proto_try_module_get(target->family) < 0) {
408 printk(KERN_WARNING "can't load conntrack support for "
409 "proto=%u\n", target->family);
410 return false;
411 }
412
413 return true;
414 }
415
416 /* drop reference count of cluster config when rule is deleted */
417 static void clusterip_tg_destroy(const struct xt_target *target, void *targinfo)
418 {
419 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
420
421 /* if no more entries are referencing the config, remove it
422 * from the list and destroy the proc entry */
423 clusterip_config_entry_put(cipinfo->config);
424
425 clusterip_config_put(cipinfo->config);
426
427 nf_ct_l3proto_module_put(target->family);
428 }
429
430 #ifdef CONFIG_COMPAT
431 struct compat_ipt_clusterip_tgt_info
432 {
433 u_int32_t flags;
434 u_int8_t clustermac[6];
435 u_int16_t num_total_nodes;
436 u_int16_t num_local_nodes;
437 u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
438 u_int32_t hash_mode;
439 u_int32_t hash_initval;
440 compat_uptr_t config;
441 };
442 #endif /* CONFIG_COMPAT */
443
444 static struct xt_target clusterip_tg_reg __read_mostly = {
445 .name = "CLUSTERIP",
446 .family = AF_INET,
447 .target = clusterip_tg,
448 .checkentry = clusterip_tg_check,
449 .destroy = clusterip_tg_destroy,
450 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
451 #ifdef CONFIG_COMPAT
452 .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
453 #endif /* CONFIG_COMPAT */
454 .me = THIS_MODULE
455 };
456
457
458 /***********************************************************************
459 * ARP MANGLING CODE
460 ***********************************************************************/
461
462 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
463 struct arp_payload {
464 u_int8_t src_hw[ETH_ALEN];
465 __be32 src_ip;
466 u_int8_t dst_hw[ETH_ALEN];
467 __be32 dst_ip;
468 } __attribute__ ((packed));
469
470 #ifdef DEBUG
471 static void arp_print(struct arp_payload *payload)
472 {
473 #define HBUFFERLEN 30
474 char hbuffer[HBUFFERLEN];
475 int j,k;
476 const char hexbuf[]= "0123456789abcdef";
477
478 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
479 hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
480 hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
481 hbuffer[k++]=':';
482 }
483 hbuffer[--k]='\0';
484
485 printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n",
486 NIPQUAD(payload->src_ip), hbuffer,
487 NIPQUAD(payload->dst_ip));
488 }
489 #endif
490
491 static unsigned int
492 arp_mangle(unsigned int hook,
493 struct sk_buff *skb,
494 const struct net_device *in,
495 const struct net_device *out,
496 int (*okfn)(struct sk_buff *))
497 {
498 struct arphdr *arp = arp_hdr(skb);
499 struct arp_payload *payload;
500 struct clusterip_config *c;
501
502 /* we don't care about non-ethernet and non-ipv4 ARP */
503 if (arp->ar_hrd != htons(ARPHRD_ETHER)
504 || arp->ar_pro != htons(ETH_P_IP)
505 || arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
506 return NF_ACCEPT;
507
508 /* we only want to mangle arp requests and replies */
509 if (arp->ar_op != htons(ARPOP_REPLY)
510 && arp->ar_op != htons(ARPOP_REQUEST))
511 return NF_ACCEPT;
512
513 payload = (void *)(arp+1);
514
515 /* if there is no clusterip configuration for the arp reply's
516 * source ip, we don't want to mangle it */
517 c = clusterip_config_find_get(payload->src_ip, 0);
518 if (!c)
519 return NF_ACCEPT;
520
521 /* normally the linux kernel always replies to arp queries of
522 * addresses on different interfacs. However, in the CLUSTERIP case
523 * this wouldn't work, since we didn't subscribe the mcast group on
524 * other interfaces */
525 if (c->dev != out) {
526 pr_debug("CLUSTERIP: not mangling arp reply on different "
527 "interface: cip'%s'-skb'%s'\n",
528 c->dev->name, out->name);
529 clusterip_config_put(c);
530 return NF_ACCEPT;
531 }
532
533 /* mangle reply hardware address */
534 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
535
536 #ifdef DEBUG
537 pr_debug(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
538 arp_print(payload);
539 #endif
540
541 clusterip_config_put(c);
542
543 return NF_ACCEPT;
544 }
545
546 static struct nf_hook_ops cip_arp_ops __read_mostly = {
547 .hook = arp_mangle,
548 .pf = NF_ARP,
549 .hooknum = NF_ARP_OUT,
550 .priority = -1
551 };
552
553 /***********************************************************************
554 * PROC DIR HANDLING
555 ***********************************************************************/
556
557 #ifdef CONFIG_PROC_FS
558
559 struct clusterip_seq_position {
560 unsigned int pos; /* position */
561 unsigned int weight; /* number of bits set == size */
562 unsigned int bit; /* current bit */
563 unsigned long val; /* current value */
564 };
565
566 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
567 {
568 struct proc_dir_entry *pde = s->private;
569 struct clusterip_config *c = pde->data;
570 unsigned int weight;
571 u_int32_t local_nodes;
572 struct clusterip_seq_position *idx;
573
574 /* FIXME: possible race */
575 local_nodes = c->local_nodes;
576 weight = hweight32(local_nodes);
577 if (*pos >= weight)
578 return NULL;
579
580 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
581 if (!idx)
582 return ERR_PTR(-ENOMEM);
583
584 idx->pos = *pos;
585 idx->weight = weight;
586 idx->bit = ffs(local_nodes);
587 idx->val = local_nodes;
588 clear_bit(idx->bit - 1, &idx->val);
589
590 return idx;
591 }
592
593 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
594 {
595 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
596
597 *pos = ++idx->pos;
598 if (*pos >= idx->weight) {
599 kfree(v);
600 return NULL;
601 }
602 idx->bit = ffs(idx->val);
603 clear_bit(idx->bit - 1, &idx->val);
604 return idx;
605 }
606
607 static void clusterip_seq_stop(struct seq_file *s, void *v)
608 {
609 kfree(v);
610 }
611
612 static int clusterip_seq_show(struct seq_file *s, void *v)
613 {
614 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
615
616 if (idx->pos != 0)
617 seq_putc(s, ',');
618
619 seq_printf(s, "%u", idx->bit);
620
621 if (idx->pos == idx->weight - 1)
622 seq_putc(s, '\n');
623
624 return 0;
625 }
626
627 static const struct seq_operations clusterip_seq_ops = {
628 .start = clusterip_seq_start,
629 .next = clusterip_seq_next,
630 .stop = clusterip_seq_stop,
631 .show = clusterip_seq_show,
632 };
633
634 static int clusterip_proc_open(struct inode *inode, struct file *file)
635 {
636 int ret = seq_open(file, &clusterip_seq_ops);
637
638 if (!ret) {
639 struct seq_file *sf = file->private_data;
640 struct proc_dir_entry *pde = PDE(inode);
641 struct clusterip_config *c = pde->data;
642
643 sf->private = pde;
644
645 clusterip_config_get(c);
646 }
647
648 return ret;
649 }
650
651 static int clusterip_proc_release(struct inode *inode, struct file *file)
652 {
653 struct proc_dir_entry *pde = PDE(inode);
654 struct clusterip_config *c = pde->data;
655 int ret;
656
657 ret = seq_release(inode, file);
658
659 if (!ret)
660 clusterip_config_put(c);
661
662 return ret;
663 }
664
665 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
666 size_t size, loff_t *ofs)
667 {
668 #define PROC_WRITELEN 10
669 char buffer[PROC_WRITELEN+1];
670 struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
671 struct clusterip_config *c = pde->data;
672 unsigned long nodenum;
673
674 if (copy_from_user(buffer, input, PROC_WRITELEN))
675 return -EFAULT;
676
677 if (*buffer == '+') {
678 nodenum = simple_strtoul(buffer+1, NULL, 10);
679 if (clusterip_add_node(c, nodenum))
680 return -ENOMEM;
681 } else if (*buffer == '-') {
682 nodenum = simple_strtoul(buffer+1, NULL,10);
683 if (clusterip_del_node(c, nodenum))
684 return -ENOENT;
685 } else
686 return -EIO;
687
688 return size;
689 }
690
691 static const struct file_operations clusterip_proc_fops = {
692 .owner = THIS_MODULE,
693 .open = clusterip_proc_open,
694 .read = seq_read,
695 .write = clusterip_proc_write,
696 .llseek = seq_lseek,
697 .release = clusterip_proc_release,
698 };
699
700 #endif /* CONFIG_PROC_FS */
701
702 static int __init clusterip_tg_init(void)
703 {
704 int ret;
705
706 ret = xt_register_target(&clusterip_tg_reg);
707 if (ret < 0)
708 return ret;
709
710 ret = nf_register_hook(&cip_arp_ops);
711 if (ret < 0)
712 goto cleanup_target;
713
714 #ifdef CONFIG_PROC_FS
715 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", init_net.proc_net);
716 if (!clusterip_procdir) {
717 printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
718 ret = -ENOMEM;
719 goto cleanup_hook;
720 }
721 #endif /* CONFIG_PROC_FS */
722
723 printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
724 CLUSTERIP_VERSION);
725 return 0;
726
727 #ifdef CONFIG_PROC_FS
728 cleanup_hook:
729 nf_unregister_hook(&cip_arp_ops);
730 #endif /* CONFIG_PROC_FS */
731 cleanup_target:
732 xt_unregister_target(&clusterip_tg_reg);
733 return ret;
734 }
735
736 static void __exit clusterip_tg_exit(void)
737 {
738 printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
739 CLUSTERIP_VERSION);
740 #ifdef CONFIG_PROC_FS
741 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
742 #endif
743 nf_unregister_hook(&cip_arp_ops);
744 xt_unregister_target(&clusterip_tg_reg);
745 }
746
747 module_init(clusterip_tg_init);
748 module_exit(clusterip_tg_exit);
Linux kernel - Deliverables
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