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Pull virt-cpu-accounting 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/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 write_lock_bh(&clusterip_lock);
86 if (atomic_dec_and_test(&c->entries)) {
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 return;
100 }
101 write_unlock_bh(&clusterip_lock);
102 }
103
104 static struct clusterip_config *
105 __clusterip_config_find(__be32 clusterip)
106 {
107 struct clusterip_config *c;
108
109 list_for_each_entry(c, &clusterip_configs, list) {
110 if (c->clusterip == clusterip)
111 return c;
112 }
113
114 return NULL;
115 }
116
117 static inline struct clusterip_config *
118 clusterip_config_find_get(__be32 clusterip, int entry)
119 {
120 struct clusterip_config *c;
121
122 read_lock_bh(&clusterip_lock);
123 c = __clusterip_config_find(clusterip);
124 if (!c) {
125 read_unlock_bh(&clusterip_lock);
126 return NULL;
127 }
128 atomic_inc(&c->refcount);
129 if (entry)
130 atomic_inc(&c->entries);
131 read_unlock_bh(&clusterip_lock);
132
133 return c;
134 }
135
136 static void
137 clusterip_config_init_nodelist(struct clusterip_config *c,
138 const struct ipt_clusterip_tgt_info *i)
139 {
140 int n;
141
142 for (n = 0; n < i->num_local_nodes; n++)
143 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
144 }
145
146 static struct clusterip_config *
147 clusterip_config_init(struct ipt_clusterip_tgt_info *i, __be32 ip,
148 struct net_device *dev)
149 {
150 struct clusterip_config *c;
151
152 c = kzalloc(sizeof(*c), GFP_ATOMIC);
153 if (!c)
154 return NULL;
155
156 c->dev = dev;
157 c->clusterip = ip;
158 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
159 c->num_total_nodes = i->num_total_nodes;
160 clusterip_config_init_nodelist(c, i);
161 c->hash_mode = i->hash_mode;
162 c->hash_initval = i->hash_initval;
163 atomic_set(&c->refcount, 1);
164 atomic_set(&c->entries, 1);
165
166 #ifdef CONFIG_PROC_FS
167 {
168 char buffer[16];
169
170 /* create proc dir entry */
171 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
172 c->pde = proc_create(buffer, S_IWUSR|S_IRUSR,
173 clusterip_procdir, &clusterip_proc_fops);
174 if (!c->pde) {
175 kfree(c);
176 return NULL;
177 }
178 }
179 c->pde->data = c;
180 #endif
181
182 write_lock_bh(&clusterip_lock);
183 list_add(&c->list, &clusterip_configs);
184 write_unlock_bh(&clusterip_lock);
185
186 return c;
187 }
188
189 #ifdef CONFIG_PROC_FS
190 static int
191 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
192 {
193
194 if (nodenum == 0 ||
195 nodenum > c->num_total_nodes)
196 return 1;
197
198 /* check if we already have this number in our bitfield */
199 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
200 return 1;
201
202 return 0;
203 }
204
205 static bool
206 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
207 {
208 if (nodenum == 0 ||
209 nodenum > c->num_total_nodes)
210 return true;
211
212 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
213 return false;
214
215 return true;
216 }
217 #endif
218
219 static inline u_int32_t
220 clusterip_hashfn(const struct sk_buff *skb,
221 const struct clusterip_config *config)
222 {
223 const struct iphdr *iph = ip_hdr(skb);
224 unsigned long hashval;
225 u_int16_t sport, dport;
226 const u_int16_t *ports;
227
228 switch (iph->protocol) {
229 case IPPROTO_TCP:
230 case IPPROTO_UDP:
231 case IPPROTO_UDPLITE:
232 case IPPROTO_SCTP:
233 case IPPROTO_DCCP:
234 case IPPROTO_ICMP:
235 ports = (const void *)iph+iph->ihl*4;
236 sport = ports[0];
237 dport = ports[1];
238 break;
239 default:
240 if (net_ratelimit())
241 printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
242 iph->protocol);
243 sport = dport = 0;
244 }
245
246 switch (config->hash_mode) {
247 case CLUSTERIP_HASHMODE_SIP:
248 hashval = jhash_1word(ntohl(iph->saddr),
249 config->hash_initval);
250 break;
251 case CLUSTERIP_HASHMODE_SIP_SPT:
252 hashval = jhash_2words(ntohl(iph->saddr), sport,
253 config->hash_initval);
254 break;
255 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
256 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
257 config->hash_initval);
258 break;
259 default:
260 /* to make gcc happy */
261 hashval = 0;
262 /* This cannot happen, unless the check function wasn't called
263 * at rule load time */
264 printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
265 BUG();
266 break;
267 }
268
269 /* node numbers are 1..n, not 0..n */
270 return (((u64)hashval * config->num_total_nodes) >> 32) + 1;
271 }
272
273 static inline int
274 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
275 {
276 return test_bit(hash - 1, &config->local_nodes);
277 }
278
279 /***********************************************************************
280 * IPTABLES TARGET
281 ***********************************************************************/
282
283 static unsigned int
284 clusterip_tg(struct sk_buff *skb, const struct net_device *in,
285 const struct net_device *out, unsigned int hooknum,
286 const struct xt_target *target, const void *targinfo)
287 {
288 const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
289 struct nf_conn *ct;
290 enum ip_conntrack_info ctinfo;
291 u_int32_t hash;
292
293 /* don't need to clusterip_config_get() here, since refcount
294 * is only decremented by destroy() - and ip_tables guarantees
295 * that the ->target() function isn't called after ->destroy() */
296
297 ct = nf_ct_get(skb, &ctinfo);
298 if (ct == NULL) {
299 printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
300 /* FIXME: need to drop invalid ones, since replies
301 * to outgoing connections of other nodes will be
302 * marked as INVALID */
303 return NF_DROP;
304 }
305
306 /* special case: ICMP error handling. conntrack distinguishes between
307 * error messages (RELATED) and information requests (see below) */
308 if (ip_hdr(skb)->protocol == IPPROTO_ICMP
309 && (ctinfo == IP_CT_RELATED
310 || ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
311 return XT_CONTINUE;
312
313 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
314 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
315 * on, which all have an ID field [relevant for hashing]. */
316
317 hash = clusterip_hashfn(skb, cipinfo->config);
318
319 switch (ctinfo) {
320 case IP_CT_NEW:
321 ct->mark = hash;
322 break;
323 case IP_CT_RELATED:
324 case IP_CT_RELATED+IP_CT_IS_REPLY:
325 /* FIXME: we don't handle expectations at the
326 * moment. they can arrive on a different node than
327 * the master connection (e.g. FTP passive mode) */
328 case IP_CT_ESTABLISHED:
329 case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
330 break;
331 default:
332 break;
333 }
334
335 #ifdef DEBUG
336 DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
337 #endif
338 pr_debug("hash=%u ct_hash=%u ", hash, ct->mark);
339 if (!clusterip_responsible(cipinfo->config, hash)) {
340 pr_debug("not responsible\n");
341 return NF_DROP;
342 }
343 pr_debug("responsible\n");
344
345 /* despite being received via linklayer multicast, this is
346 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
347 skb->pkt_type = PACKET_HOST;
348
349 return XT_CONTINUE;
350 }
351
352 static bool
353 clusterip_tg_check(const char *tablename, const void *e_void,
354 const struct xt_target *target, void *targinfo,
355 unsigned int hook_mask)
356 {
357 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
358 const struct ipt_entry *e = e_void;
359
360 struct clusterip_config *config;
361
362 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
363 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
364 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
365 printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
366 cipinfo->hash_mode);
367 return false;
368
369 }
370 if (e->ip.dmsk.s_addr != htonl(0xffffffff)
371 || e->ip.dst.s_addr == 0) {
372 printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
373 return false;
374 }
375
376 /* FIXME: further sanity checks */
377
378 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
379 if (!config) {
380 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
381 printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
382 return false;
383 } else {
384 struct net_device *dev;
385
386 if (e->ip.iniface[0] == '\0') {
387 printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
388 return false;
389 }
390
391 dev = dev_get_by_name(&init_net, e->ip.iniface);
392 if (!dev) {
393 printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
394 return false;
395 }
396
397 config = clusterip_config_init(cipinfo,
398 e->ip.dst.s_addr, dev);
399 if (!config) {
400 printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
401 dev_put(dev);
402 return false;
403 }
404 dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
405 }
406 }
407 cipinfo->config = config;
408
409 if (nf_ct_l3proto_try_module_get(target->family) < 0) {
410 printk(KERN_WARNING "can't load conntrack support for "
411 "proto=%u\n", target->family);
412 return false;
413 }
414
415 return true;
416 }
417
418 /* drop reference count of cluster config when rule is deleted */
419 static void clusterip_tg_destroy(const struct xt_target *target, void *targinfo)
420 {
421 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
422
423 /* if no more entries are referencing the config, remove it
424 * from the list and destroy the proc entry */
425 clusterip_config_entry_put(cipinfo->config);
426
427 clusterip_config_put(cipinfo->config);
428
429 nf_ct_l3proto_module_put(target->family);
430 }
431
432 #ifdef CONFIG_COMPAT
433 struct compat_ipt_clusterip_tgt_info
434 {
435 u_int32_t flags;
436 u_int8_t clustermac[6];
437 u_int16_t num_total_nodes;
438 u_int16_t num_local_nodes;
439 u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
440 u_int32_t hash_mode;
441 u_int32_t hash_initval;
442 compat_uptr_t config;
443 };
444 #endif /* CONFIG_COMPAT */
445
446 static struct xt_target clusterip_tg_reg __read_mostly = {
447 .name = "CLUSTERIP",
448 .family = AF_INET,
449 .target = clusterip_tg,
450 .checkentry = clusterip_tg_check,
451 .destroy = clusterip_tg_destroy,
452 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
453 #ifdef CONFIG_COMPAT
454 .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
455 #endif /* CONFIG_COMPAT */
456 .me = THIS_MODULE
457 };
458
459
460 /***********************************************************************
461 * ARP MANGLING CODE
462 ***********************************************************************/
463
464 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
465 struct arp_payload {
466 u_int8_t src_hw[ETH_ALEN];
467 __be32 src_ip;
468 u_int8_t dst_hw[ETH_ALEN];
469 __be32 dst_ip;
470 } __attribute__ ((packed));
471
472 #ifdef DEBUG
473 static void arp_print(struct arp_payload *payload)
474 {
475 #define HBUFFERLEN 30
476 char hbuffer[HBUFFERLEN];
477 int j,k;
478 const char hexbuf[]= "0123456789abcdef";
479
480 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
481 hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
482 hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
483 hbuffer[k++]=':';
484 }
485 hbuffer[--k]='\0';
486
487 printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n",
488 NIPQUAD(payload->src_ip), hbuffer,
489 NIPQUAD(payload->dst_ip));
490 }
491 #endif
492
493 static unsigned int
494 arp_mangle(unsigned int hook,
495 struct sk_buff *skb,
496 const struct net_device *in,
497 const struct net_device *out,
498 int (*okfn)(struct sk_buff *))
499 {
500 struct arphdr *arp = arp_hdr(skb);
501 struct arp_payload *payload;
502 struct clusterip_config *c;
503
504 /* we don't care about non-ethernet and non-ipv4 ARP */
505 if (arp->ar_hrd != htons(ARPHRD_ETHER)
506 || arp->ar_pro != htons(ETH_P_IP)
507 || arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
508 return NF_ACCEPT;
509
510 /* we only want to mangle arp requests and replies */
511 if (arp->ar_op != htons(ARPOP_REPLY)
512 && arp->ar_op != htons(ARPOP_REQUEST))
513 return NF_ACCEPT;
514
515 payload = (void *)(arp+1);
516
517 /* if there is no clusterip configuration for the arp reply's
518 * source ip, we don't want to mangle it */
519 c = clusterip_config_find_get(payload->src_ip, 0);
520 if (!c)
521 return NF_ACCEPT;
522
523 /* normally the linux kernel always replies to arp queries of
524 * addresses on different interfacs. However, in the CLUSTERIP case
525 * this wouldn't work, since we didn't subscribe the mcast group on
526 * other interfaces */
527 if (c->dev != out) {
528 pr_debug("CLUSTERIP: not mangling arp reply on different "
529 "interface: cip'%s'-skb'%s'\n",
530 c->dev->name, out->name);
531 clusterip_config_put(c);
532 return NF_ACCEPT;
533 }
534
535 /* mangle reply hardware address */
536 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
537
538 #ifdef DEBUG
539 pr_debug(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
540 arp_print(payload);
541 #endif
542
543 clusterip_config_put(c);
544
545 return NF_ACCEPT;
546 }
547
548 static struct nf_hook_ops cip_arp_ops __read_mostly = {
549 .hook = arp_mangle,
550 .pf = NF_ARP,
551 .hooknum = NF_ARP_OUT,
552 .priority = -1
553 };
554
555 /***********************************************************************
556 * PROC DIR HANDLING
557 ***********************************************************************/
558
559 #ifdef CONFIG_PROC_FS
560
561 struct clusterip_seq_position {
562 unsigned int pos; /* position */
563 unsigned int weight; /* number of bits set == size */
564 unsigned int bit; /* current bit */
565 unsigned long val; /* current value */
566 };
567
568 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
569 {
570 struct proc_dir_entry *pde = s->private;
571 struct clusterip_config *c = pde->data;
572 unsigned int weight;
573 u_int32_t local_nodes;
574 struct clusterip_seq_position *idx;
575
576 /* FIXME: possible race */
577 local_nodes = c->local_nodes;
578 weight = hweight32(local_nodes);
579 if (*pos >= weight)
580 return NULL;
581
582 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
583 if (!idx)
584 return ERR_PTR(-ENOMEM);
585
586 idx->pos = *pos;
587 idx->weight = weight;
588 idx->bit = ffs(local_nodes);
589 idx->val = local_nodes;
590 clear_bit(idx->bit - 1, &idx->val);
591
592 return idx;
593 }
594
595 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
596 {
597 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
598
599 *pos = ++idx->pos;
600 if (*pos >= idx->weight) {
601 kfree(v);
602 return NULL;
603 }
604 idx->bit = ffs(idx->val);
605 clear_bit(idx->bit - 1, &idx->val);
606 return idx;
607 }
608
609 static void clusterip_seq_stop(struct seq_file *s, void *v)
610 {
611 kfree(v);
612 }
613
614 static int clusterip_seq_show(struct seq_file *s, void *v)
615 {
616 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
617
618 if (idx->pos != 0)
619 seq_putc(s, ',');
620
621 seq_printf(s, "%u", idx->bit);
622
623 if (idx->pos == idx->weight - 1)
624 seq_putc(s, '\n');
625
626 return 0;
627 }
628
629 static const struct seq_operations clusterip_seq_ops = {
630 .start = clusterip_seq_start,
631 .next = clusterip_seq_next,
632 .stop = clusterip_seq_stop,
633 .show = clusterip_seq_show,
634 };
635
636 static int clusterip_proc_open(struct inode *inode, struct file *file)
637 {
638 int ret = seq_open(file, &clusterip_seq_ops);
639
640 if (!ret) {
641 struct seq_file *sf = file->private_data;
642 struct proc_dir_entry *pde = PDE(inode);
643 struct clusterip_config *c = pde->data;
644
645 sf->private = pde;
646
647 clusterip_config_get(c);
648 }
649
650 return ret;
651 }
652
653 static int clusterip_proc_release(struct inode *inode, struct file *file)
654 {
655 struct proc_dir_entry *pde = PDE(inode);
656 struct clusterip_config *c = pde->data;
657 int ret;
658
659 ret = seq_release(inode, file);
660
661 if (!ret)
662 clusterip_config_put(c);
663
664 return ret;
665 }
666
667 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
668 size_t size, loff_t *ofs)
669 {
670 #define PROC_WRITELEN 10
671 char buffer[PROC_WRITELEN+1];
672 struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
673 struct clusterip_config *c = pde->data;
674 unsigned long nodenum;
675
676 if (copy_from_user(buffer, input, PROC_WRITELEN))
677 return -EFAULT;
678
679 if (*buffer == '+') {
680 nodenum = simple_strtoul(buffer+1, NULL, 10);
681 if (clusterip_add_node(c, nodenum))
682 return -ENOMEM;
683 } else if (*buffer == '-') {
684 nodenum = simple_strtoul(buffer+1, NULL,10);
685 if (clusterip_del_node(c, nodenum))
686 return -ENOENT;
687 } else
688 return -EIO;
689
690 return size;
691 }
692
693 static const struct file_operations clusterip_proc_fops = {
694 .owner = THIS_MODULE,
695 .open = clusterip_proc_open,
696 .read = seq_read,
697 .write = clusterip_proc_write,
698 .llseek = seq_lseek,
699 .release = clusterip_proc_release,
700 };
701
702 #endif /* CONFIG_PROC_FS */
703
704 static int __init clusterip_tg_init(void)
705 {
706 int ret;
707
708 ret = xt_register_target(&clusterip_tg_reg);
709 if (ret < 0)
710 return ret;
711
712 ret = nf_register_hook(&cip_arp_ops);
713 if (ret < 0)
714 goto cleanup_target;
715
716 #ifdef CONFIG_PROC_FS
717 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", init_net.proc_net);
718 if (!clusterip_procdir) {
719 printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
720 ret = -ENOMEM;
721 goto cleanup_hook;
722 }
723 #endif /* CONFIG_PROC_FS */
724
725 printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
726 CLUSTERIP_VERSION);
727 return 0;
728
729 #ifdef CONFIG_PROC_FS
730 cleanup_hook:
731 nf_unregister_hook(&cip_arp_ops);
732 #endif /* CONFIG_PROC_FS */
733 cleanup_target:
734 xt_unregister_target(&clusterip_tg_reg);
735 return ret;
736 }
737
738 static void __exit clusterip_tg_exit(void)
739 {
740 printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
741 CLUSTERIP_VERSION);
742 #ifdef CONFIG_PROC_FS
743 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
744 #endif
745 nf_unregister_hook(&cip_arp_ops);
746 xt_unregister_target(&clusterip_tg_reg);
747 }
748
749 module_init(clusterip_tg_init);
750 module_exit(clusterip_tg_exit);
Linux kernel - Deliverables
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