projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[NETFILTER]: Fix section mismatch warnings
[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/config.h>
14 #include <linux/proc_fs.h>
15 #include <linux/jhash.h>
16 #include <linux/bitops.h>
17 #include <linux/skbuff.h>
18 #include <linux/ip.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/icmp.h>
22 #include <linux/if_arp.h>
23 #include <linux/proc_fs.h>
24 #include <linux/seq_file.h>
25
26 #include <net/checksum.h>
27
28 #include <linux/netfilter_arp.h>
29
30 #include <linux/netfilter_ipv4/ip_tables.h>
31 #include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
32 #include <net/netfilter/nf_conntrack_compat.h>
33
34 #define CLUSTERIP_VERSION "0.8"
35
36 #define DEBUG_CLUSTERIP
37
38 #ifdef DEBUG_CLUSTERIP
39 #define DEBUGP printk
40 #else
41 #define DEBUGP
42 #endif
43
44 #define ASSERT_READ_LOCK(x)
45
46 MODULE_LICENSE("GPL");
47 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
48 MODULE_DESCRIPTION("iptables target for CLUSTERIP");
49
50 struct clusterip_config {
51 struct list_head list; /* list of all configs */
52 atomic_t refcount; /* reference count */
53 atomic_t entries; /* number of entries/rules
54 * referencing us */
55
56 u_int32_t clusterip; /* the IP address */
57 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
58 struct net_device *dev; /* device */
59 u_int16_t num_total_nodes; /* total number of nodes */
60 unsigned long local_nodes; /* node number array */
61
62 #ifdef CONFIG_PROC_FS
63 struct proc_dir_entry *pde; /* proc dir entry */
64 #endif
65 enum clusterip_hashmode hash_mode; /* which hashing mode */
66 u_int32_t hash_initval; /* hash initialization */
67 };
68
69 static LIST_HEAD(clusterip_configs);
70
71 /* clusterip_lock protects the clusterip_configs list */
72 static DEFINE_RWLOCK(clusterip_lock);
73
74 #ifdef CONFIG_PROC_FS
75 static struct file_operations clusterip_proc_fops;
76 static struct proc_dir_entry *clusterip_procdir;
77 #endif
78
79 static inline void
80 clusterip_config_get(struct clusterip_config *c)
81 {
82 atomic_inc(&c->refcount);
83 }
84
85 static inline void
86 clusterip_config_put(struct clusterip_config *c)
87 {
88 if (atomic_dec_and_test(&c->refcount))
89 kfree(c);
90 }
91
92 /* increase the count of entries(rules) using/referencing this config */
93 static inline void
94 clusterip_config_entry_get(struct clusterip_config *c)
95 {
96 atomic_inc(&c->entries);
97 }
98
99 /* decrease the count of entries using/referencing this config. If last
100 * entry(rule) is removed, remove the config from lists, but don't free it
101 * yet, since proc-files could still be holding references */
102 static inline void
103 clusterip_config_entry_put(struct clusterip_config *c)
104 {
105 if (atomic_dec_and_test(&c->entries)) {
106 write_lock_bh(&clusterip_lock);
107 list_del(&c->list);
108 write_unlock_bh(&clusterip_lock);
109
110 dev_mc_delete(c->dev, c->clustermac, ETH_ALEN, 0);
111 dev_put(c->dev);
112
113 /* In case anyone still accesses the file, the open/close
114 * functions are also incrementing the refcount on their own,
115 * so it's safe to remove the entry even if it's in use. */
116 #ifdef CONFIG_PROC_FS
117 remove_proc_entry(c->pde->name, c->pde->parent);
118 #endif
119 }
120 }
121
122 static struct clusterip_config *
123 __clusterip_config_find(u_int32_t clusterip)
124 {
125 struct list_head *pos;
126
127 ASSERT_READ_LOCK(&clusterip_lock);
128 list_for_each(pos, &clusterip_configs) {
129 struct clusterip_config *c = list_entry(pos,
130 struct clusterip_config, list);
131 if (c->clusterip == clusterip) {
132 return c;
133 }
134 }
135
136 return NULL;
137 }
138
139 static inline struct clusterip_config *
140 clusterip_config_find_get(u_int32_t clusterip, int entry)
141 {
142 struct clusterip_config *c;
143
144 read_lock_bh(&clusterip_lock);
145 c = __clusterip_config_find(clusterip);
146 if (!c) {
147 read_unlock_bh(&clusterip_lock);
148 return NULL;
149 }
150 atomic_inc(&c->refcount);
151 if (entry)
152 atomic_inc(&c->entries);
153 read_unlock_bh(&clusterip_lock);
154
155 return c;
156 }
157
158 static void
159 clusterip_config_init_nodelist(struct clusterip_config *c,
160 const struct ipt_clusterip_tgt_info *i)
161 {
162 int n;
163
164 for (n = 0; n < i->num_local_nodes; n++) {
165 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
166 }
167 }
168
169 static struct clusterip_config *
170 clusterip_config_init(struct ipt_clusterip_tgt_info *i, u_int32_t ip,
171 struct net_device *dev)
172 {
173 struct clusterip_config *c;
174 char buffer[16];
175
176 c = kmalloc(sizeof(*c), GFP_ATOMIC);
177 if (!c)
178 return NULL;
179
180 memset(c, 0, sizeof(*c));
181 c->dev = dev;
182 c->clusterip = ip;
183 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
184 c->num_total_nodes = i->num_total_nodes;
185 clusterip_config_init_nodelist(c, i);
186 c->hash_mode = i->hash_mode;
187 c->hash_initval = i->hash_initval;
188 atomic_set(&c->refcount, 1);
189 atomic_set(&c->entries, 1);
190
191 #ifdef CONFIG_PROC_FS
192 /* create proc dir entry */
193 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(ip));
194 c->pde = create_proc_entry(buffer, S_IWUSR|S_IRUSR, clusterip_procdir);
195 if (!c->pde) {
196 kfree(c);
197 return NULL;
198 }
199 c->pde->proc_fops = &clusterip_proc_fops;
200 c->pde->data = c;
201 #endif
202
203 write_lock_bh(&clusterip_lock);
204 list_add(&c->list, &clusterip_configs);
205 write_unlock_bh(&clusterip_lock);
206
207 return c;
208 }
209
210 static int
211 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
212 {
213
214 if (nodenum == 0 ||
215 nodenum > c->num_total_nodes)
216 return 1;
217
218 /* check if we already have this number in our bitfield */
219 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
220 return 1;
221
222 return 0;
223 }
224
225 static int
226 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
227 {
228 if (nodenum == 0 ||
229 nodenum > c->num_total_nodes)
230 return 1;
231
232 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
233 return 0;
234
235 return 1;
236 }
237
238 static inline u_int32_t
239 clusterip_hashfn(struct sk_buff *skb, struct clusterip_config *config)
240 {
241 struct iphdr *iph = skb->nh.iph;
242 unsigned long hashval;
243 u_int16_t sport, dport;
244 struct tcphdr *th;
245 struct udphdr *uh;
246 struct icmphdr *ih;
247
248 switch (iph->protocol) {
249 case IPPROTO_TCP:
250 th = (void *)iph+iph->ihl*4;
251 sport = ntohs(th->source);
252 dport = ntohs(th->dest);
253 break;
254 case IPPROTO_UDP:
255 uh = (void *)iph+iph->ihl*4;
256 sport = ntohs(uh->source);
257 dport = ntohs(uh->dest);
258 break;
259 case IPPROTO_ICMP:
260 ih = (void *)iph+iph->ihl*4;
261 sport = ntohs(ih->un.echo.id);
262 dport = (ih->type<<8)|ih->code;
263 break;
264 default:
265 if (net_ratelimit()) {
266 printk(KERN_NOTICE "CLUSTERIP: unknown protocol `%u'\n",
267 iph->protocol);
268 }
269 sport = dport = 0;
270 }
271
272 switch (config->hash_mode) {
273 case CLUSTERIP_HASHMODE_SIP:
274 hashval = jhash_1word(ntohl(iph->saddr),
275 config->hash_initval);
276 break;
277 case CLUSTERIP_HASHMODE_SIP_SPT:
278 hashval = jhash_2words(ntohl(iph->saddr), sport,
279 config->hash_initval);
280 break;
281 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
282 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
283 config->hash_initval);
284 break;
285 default:
286 /* to make gcc happy */
287 hashval = 0;
288 /* This cannot happen, unless the check function wasn't called
289 * at rule load time */
290 printk("CLUSTERIP: unknown mode `%u'\n", config->hash_mode);
291 BUG();
292 break;
293 }
294
295 /* node numbers are 1..n, not 0..n */
296 return ((hashval % config->num_total_nodes)+1);
297 }
298
299 static inline int
300 clusterip_responsible(struct clusterip_config *config, u_int32_t hash)
301 {
302 return test_bit(hash - 1, &config->local_nodes);
303 }
304
305 /***********************************************************************
306 * IPTABLES TARGET
307 ***********************************************************************/
308
309 static unsigned int
310 target(struct sk_buff **pskb,
311 const struct net_device *in,
312 const struct net_device *out,
313 unsigned int hooknum,
314 const struct xt_target *target,
315 const void *targinfo,
316 void *userinfo)
317 {
318 const struct ipt_clusterip_tgt_info *cipinfo = targinfo;
319 enum ip_conntrack_info ctinfo;
320 u_int32_t *mark, hash;
321
322 /* don't need to clusterip_config_get() here, since refcount
323 * is only decremented by destroy() - and ip_tables guarantees
324 * that the ->target() function isn't called after ->destroy() */
325
326 mark = nf_ct_get_mark((*pskb), &ctinfo);
327 if (mark == NULL) {
328 printk(KERN_ERR "CLUSTERIP: no conntrack!\n");
329 /* FIXME: need to drop invalid ones, since replies
330 * to outgoing connections of other nodes will be
331 * marked as INVALID */
332 return NF_DROP;
333 }
334
335 /* special case: ICMP error handling. conntrack distinguishes between
336 * error messages (RELATED) and information requests (see below) */
337 if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP
338 && (ctinfo == IP_CT_RELATED
339 || ctinfo == IP_CT_RELATED+IP_CT_IS_REPLY))
340 return IPT_CONTINUE;
341
342 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
343 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
344 * on, which all have an ID field [relevant for hashing]. */
345
346 hash = clusterip_hashfn(*pskb, cipinfo->config);
347
348 switch (ctinfo) {
349 case IP_CT_NEW:
350 *mark = hash;
351 break;
352 case IP_CT_RELATED:
353 case IP_CT_RELATED+IP_CT_IS_REPLY:
354 /* FIXME: we don't handle expectations at the
355 * moment. they can arrive on a different node than
356 * the master connection (e.g. FTP passive mode) */
357 case IP_CT_ESTABLISHED:
358 case IP_CT_ESTABLISHED+IP_CT_IS_REPLY:
359 break;
360 default:
361 break;
362 }
363
364 #ifdef DEBUG_CLUSTERP
365 DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
366 #endif
367 DEBUGP("hash=%u ct_hash=%u ", hash, *mark);
368 if (!clusterip_responsible(cipinfo->config, hash)) {
369 DEBUGP("not responsible\n");
370 return NF_DROP;
371 }
372 DEBUGP("responsible\n");
373
374 /* despite being received via linklayer multicast, this is
375 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
376 (*pskb)->pkt_type = PACKET_HOST;
377
378 return IPT_CONTINUE;
379 }
380
381 static int
382 checkentry(const char *tablename,
383 const void *e_void,
384 const struct xt_target *target,
385 void *targinfo,
386 unsigned int targinfosize,
387 unsigned int hook_mask)
388 {
389 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
390 const struct ipt_entry *e = e_void;
391
392 struct clusterip_config *config;
393
394 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
395 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
396 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
397 printk(KERN_WARNING "CLUSTERIP: unknown mode `%u'\n",
398 cipinfo->hash_mode);
399 return 0;
400
401 }
402 if (e->ip.dmsk.s_addr != 0xffffffff
403 || e->ip.dst.s_addr == 0) {
404 printk(KERN_ERR "CLUSTERIP: Please specify destination IP\n");
405 return 0;
406 }
407
408 /* FIXME: further sanity checks */
409
410 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
411 if (config) {
412 if (cipinfo->config != NULL) {
413 /* Case A: This is an entry that gets reloaded, since
414 * it still has a cipinfo->config pointer. Simply
415 * increase the entry refcount and return */
416 if (cipinfo->config != config) {
417 printk(KERN_ERR "CLUSTERIP: Reloaded entry "
418 "has invalid config pointer!\n");
419 return 0;
420 }
421 clusterip_config_entry_get(cipinfo->config);
422 } else {
423 /* Case B: This is a new rule referring to an existing
424 * clusterip config. */
425 cipinfo->config = config;
426 clusterip_config_entry_get(cipinfo->config);
427 }
428 } else {
429 /* Case C: This is a completely new clusterip config */
430 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
431 printk(KERN_WARNING "CLUSTERIP: no config found for %u.%u.%u.%u, need 'new'\n", NIPQUAD(e->ip.dst.s_addr));
432 return 0;
433 } else {
434 struct net_device *dev;
435
436 if (e->ip.iniface[0] == '\0') {
437 printk(KERN_WARNING "CLUSTERIP: Please specify an interface name\n");
438 return 0;
439 }
440
441 dev = dev_get_by_name(e->ip.iniface);
442 if (!dev) {
443 printk(KERN_WARNING "CLUSTERIP: no such interface %s\n", e->ip.iniface);
444 return 0;
445 }
446
447 config = clusterip_config_init(cipinfo,
448 e->ip.dst.s_addr, dev);
449 if (!config) {
450 printk(KERN_WARNING "CLUSTERIP: cannot allocate config\n");
451 dev_put(dev);
452 return 0;
453 }
454 dev_mc_add(config->dev,config->clustermac, ETH_ALEN, 0);
455 }
456 cipinfo->config = config;
457 }
458
459 return 1;
460 }
461
462 /* drop reference count of cluster config when rule is deleted */
463 static void destroy(const struct xt_target *target, void *targinfo,
464 unsigned int targinfosize)
465 {
466 struct ipt_clusterip_tgt_info *cipinfo = targinfo;
467
468 /* if no more entries are referencing the config, remove it
469 * from the list and destroy the proc entry */
470 clusterip_config_entry_put(cipinfo->config);
471
472 clusterip_config_put(cipinfo->config);
473 }
474
475 static struct ipt_target clusterip_tgt = {
476 .name = "CLUSTERIP",
477 .target = target,
478 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
479 .checkentry = checkentry,
480 .destroy = destroy,
481 .me = THIS_MODULE
482 };
483
484
485 /***********************************************************************
486 * ARP MANGLING CODE
487 ***********************************************************************/
488
489 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
490 struct arp_payload {
491 u_int8_t src_hw[ETH_ALEN];
492 u_int32_t src_ip;
493 u_int8_t dst_hw[ETH_ALEN];
494 u_int32_t dst_ip;
495 } __attribute__ ((packed));
496
497 #ifdef CLUSTERIP_DEBUG
498 static void arp_print(struct arp_payload *payload)
499 {
500 #define HBUFFERLEN 30
501 char hbuffer[HBUFFERLEN];
502 int j,k;
503 const char hexbuf[]= "0123456789abcdef";
504
505 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
506 hbuffer[k++]=hexbuf[(payload->src_hw[j]>>4)&15];
507 hbuffer[k++]=hexbuf[payload->src_hw[j]&15];
508 hbuffer[k++]=':';
509 }
510 hbuffer[--k]='\0';
511
512 printk("src %u.%u.%u.%u@%s, dst %u.%u.%u.%u\n",
513 NIPQUAD(payload->src_ip), hbuffer,
514 NIPQUAD(payload->dst_ip));
515 }
516 #endif
517
518 static unsigned int
519 arp_mangle(unsigned int hook,
520 struct sk_buff **pskb,
521 const struct net_device *in,
522 const struct net_device *out,
523 int (*okfn)(struct sk_buff *))
524 {
525 struct arphdr *arp = (*pskb)->nh.arph;
526 struct arp_payload *payload;
527 struct clusterip_config *c;
528
529 /* we don't care about non-ethernet and non-ipv4 ARP */
530 if (arp->ar_hrd != htons(ARPHRD_ETHER)
531 || arp->ar_pro != htons(ETH_P_IP)
532 || arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
533 return NF_ACCEPT;
534
535 /* we only want to mangle arp requests and replies */
536 if (arp->ar_op != htons(ARPOP_REPLY)
537 && arp->ar_op != htons(ARPOP_REQUEST))
538 return NF_ACCEPT;
539
540 payload = (void *)(arp+1);
541
542 /* if there is no clusterip configuration for the arp reply's
543 * source ip, we don't want to mangle it */
544 c = clusterip_config_find_get(payload->src_ip, 0);
545 if (!c)
546 return NF_ACCEPT;
547
548 /* normally the linux kernel always replies to arp queries of
549 * addresses on different interfacs. However, in the CLUSTERIP case
550 * this wouldn't work, since we didn't subscribe the mcast group on
551 * other interfaces */
552 if (c->dev != out) {
553 DEBUGP("CLUSTERIP: not mangling arp reply on different "
554 "interface: cip'%s'-skb'%s'\n", c->dev->name, out->name);
555 clusterip_config_put(c);
556 return NF_ACCEPT;
557 }
558
559 /* mangle reply hardware address */
560 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
561
562 #ifdef CLUSTERIP_DEBUG
563 DEBUGP(KERN_DEBUG "CLUSTERIP mangled arp reply: ");
564 arp_print(payload);
565 #endif
566
567 clusterip_config_put(c);
568
569 return NF_ACCEPT;
570 }
571
572 static struct nf_hook_ops cip_arp_ops = {
573 .hook = arp_mangle,
574 .pf = NF_ARP,
575 .hooknum = NF_ARP_OUT,
576 .priority = -1
577 };
578
579 /***********************************************************************
580 * PROC DIR HANDLING
581 ***********************************************************************/
582
583 #ifdef CONFIG_PROC_FS
584
585 struct clusterip_seq_position {
586 unsigned int pos; /* position */
587 unsigned int weight; /* number of bits set == size */
588 unsigned int bit; /* current bit */
589 unsigned long val; /* current value */
590 };
591
592 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
593 {
594 struct proc_dir_entry *pde = s->private;
595 struct clusterip_config *c = pde->data;
596 unsigned int weight;
597 u_int32_t local_nodes;
598 struct clusterip_seq_position *idx;
599
600 /* FIXME: possible race */
601 local_nodes = c->local_nodes;
602 weight = hweight32(local_nodes);
603 if (*pos >= weight)
604 return NULL;
605
606 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
607 if (!idx)
608 return ERR_PTR(-ENOMEM);
609
610 idx->pos = *pos;
611 idx->weight = weight;
612 idx->bit = ffs(local_nodes);
613 idx->val = local_nodes;
614 clear_bit(idx->bit - 1, &idx->val);
615
616 return idx;
617 }
618
619 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
620 {
621 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
622
623 *pos = ++idx->pos;
624 if (*pos >= idx->weight) {
625 kfree(v);
626 return NULL;
627 }
628 idx->bit = ffs(idx->val);
629 clear_bit(idx->bit - 1, &idx->val);
630 return idx;
631 }
632
633 static void clusterip_seq_stop(struct seq_file *s, void *v)
634 {
635 kfree(v);
636 }
637
638 static int clusterip_seq_show(struct seq_file *s, void *v)
639 {
640 struct clusterip_seq_position *idx = (struct clusterip_seq_position *)v;
641
642 if (idx->pos != 0)
643 seq_putc(s, ',');
644
645 seq_printf(s, "%u", idx->bit);
646
647 if (idx->pos == idx->weight - 1)
648 seq_putc(s, '\n');
649
650 return 0;
651 }
652
653 static struct seq_operations clusterip_seq_ops = {
654 .start = clusterip_seq_start,
655 .next = clusterip_seq_next,
656 .stop = clusterip_seq_stop,
657 .show = clusterip_seq_show,
658 };
659
660 static int clusterip_proc_open(struct inode *inode, struct file *file)
661 {
662 int ret = seq_open(file, &clusterip_seq_ops);
663
664 if (!ret) {
665 struct seq_file *sf = file->private_data;
666 struct proc_dir_entry *pde = PDE(inode);
667 struct clusterip_config *c = pde->data;
668
669 sf->private = pde;
670
671 clusterip_config_get(c);
672 }
673
674 return ret;
675 }
676
677 static int clusterip_proc_release(struct inode *inode, struct file *file)
678 {
679 struct proc_dir_entry *pde = PDE(inode);
680 struct clusterip_config *c = pde->data;
681 int ret;
682
683 ret = seq_release(inode, file);
684
685 if (!ret)
686 clusterip_config_put(c);
687
688 return ret;
689 }
690
691 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
692 size_t size, loff_t *ofs)
693 {
694 #define PROC_WRITELEN 10
695 char buffer[PROC_WRITELEN+1];
696 struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode);
697 struct clusterip_config *c = pde->data;
698 unsigned long nodenum;
699
700 if (copy_from_user(buffer, input, PROC_WRITELEN))
701 return -EFAULT;
702
703 if (*buffer == '+') {
704 nodenum = simple_strtoul(buffer+1, NULL, 10);
705 if (clusterip_add_node(c, nodenum))
706 return -ENOMEM;
707 } else if (*buffer == '-') {
708 nodenum = simple_strtoul(buffer+1, NULL,10);
709 if (clusterip_del_node(c, nodenum))
710 return -ENOENT;
711 } else
712 return -EIO;
713
714 return size;
715 }
716
717 static struct file_operations clusterip_proc_fops = {
718 .owner = THIS_MODULE,
719 .open = clusterip_proc_open,
720 .read = seq_read,
721 .write = clusterip_proc_write,
722 .llseek = seq_lseek,
723 .release = clusterip_proc_release,
724 };
725
726 #endif /* CONFIG_PROC_FS */
727
728 static int __init ipt_clusterip_init(void)
729 {
730 int ret;
731
732 ret = ipt_register_target(&clusterip_tgt);
733 if (ret < 0)
734 return ret;
735
736 ret = nf_register_hook(&cip_arp_ops);
737 if (ret < 0)
738 goto cleanup_target;
739
740 #ifdef CONFIG_PROC_FS
741 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", proc_net);
742 if (!clusterip_procdir) {
743 printk(KERN_ERR "CLUSTERIP: Unable to proc dir entry\n");
744 ret = -ENOMEM;
745 goto cleanup_hook;
746 }
747 #endif /* CONFIG_PROC_FS */
748
749 printk(KERN_NOTICE "ClusterIP Version %s loaded successfully\n",
750 CLUSTERIP_VERSION);
751 return 0;
752
753 cleanup_hook:
754 nf_unregister_hook(&cip_arp_ops);
755 cleanup_target:
756 ipt_unregister_target(&clusterip_tgt);
757 return ret;
758 }
759
760 static void __exit ipt_clusterip_fini(void)
761 {
762 printk(KERN_NOTICE "ClusterIP Version %s unloading\n",
763 CLUSTERIP_VERSION);
764 #ifdef CONFIG_PROC_FS
765 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
766 #endif
767 nf_unregister_hook(&cip_arp_ops);
768 ipt_unregister_target(&clusterip_tgt);
769 }
770
771 module_init(ipt_clusterip_init);
772 module_exit(ipt_clusterip_fini);
Linux kernel - Deliverables
This page took 0.04675 seconds and 5 git commands to generate.