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