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