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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / net / ipv4 / netfilter / ipt_CLUSTERIP.c
blob789f95dcccf7e064b16170f60fd9efc2452ec9a4
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/module.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/slab.h>
19 #include <linux/ip.h>
20 #include <linux/tcp.h>
21 #include <linux/udp.h>
22 #include <linux/icmp.h>
23 #include <linux/if_arp.h>
24 #include <linux/seq_file.h>
25 #include <linux/netfilter_arp.h>
26 #include <linux/netfilter/x_tables.h>
27 #include <linux/netfilter_ipv4/ip_tables.h>
28 #include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
29 #include <net/netfilter/nf_conntrack.h>
30 #include <net/net_namespace.h>
31 #include <net/checksum.h>
32
33 #define CLUSTERIP_VERSION "0.8"
34
35 MODULE_LICENSE("GPL");
36 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
37 MODULE_DESCRIPTION("Xtables: CLUSTERIP target");
38
39 struct clusterip_config {
40 struct list_head list; /* list of all configs */
41 atomic_t refcount; /* reference count */
42 atomic_t entries; /* number of entries/rules
43 * referencing us */
44
45 __be32 clusterip; /* the IP address */
46 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
47 struct net_device *dev; /* device */
48 u_int16_t num_total_nodes; /* total number of nodes */
49 unsigned long local_nodes; /* node number array */
50
51 #ifdef CONFIG_PROC_FS
52 struct proc_dir_entry *pde; /* proc dir entry */
53 #endif
54 enum clusterip_hashmode hash_mode; /* which hashing mode */
55 u_int32_t hash_initval; /* hash initialization */
56 struct rcu_head rcu;
57 };
58
59 static LIST_HEAD(clusterip_configs);
60
61 /* clusterip_lock protects the clusterip_configs list */
62 static DEFINE_SPINLOCK(clusterip_lock);
63
64 #ifdef CONFIG_PROC_FS
65 static const struct file_operations clusterip_proc_fops;
66 static struct proc_dir_entry *clusterip_procdir;
67 #endif
68
69 static inline void
70 clusterip_config_get(struct clusterip_config *c)
71 {
72 atomic_inc(&c->refcount);
73 }
74
75
76 static void clusterip_config_rcu_free(struct rcu_head *head)
77 {
78 kfree(container_of(head, struct clusterip_config, rcu));
79 }
80
81 static inline void
82 clusterip_config_put(struct clusterip_config *c)
83 {
84 if (atomic_dec_and_test(&c->refcount))
85 call_rcu_bh(&c->rcu, clusterip_config_rcu_free);
86 }
87
88 /* decrease the count of entries using/referencing this config. If last
89 * entry(rule) is removed, remove the config from lists, but don't free it
90 * yet, since proc-files could still be holding references */
91 static inline void
92 clusterip_config_entry_put(struct clusterip_config *c)
93 {
94 local_bh_disable();
95 if (atomic_dec_and_lock(&c->entries, &clusterip_lock)) {
96 list_del_rcu(&c->list);
97 spin_unlock(&clusterip_lock);
98 local_bh_enable();
99
100 dev_mc_del(c->dev, c->clustermac);
101 dev_put(c->dev);
102
103 /* In case anyone still accesses the file, the open/close
104 * functions are also incrementing the refcount on their own,
105 * so it's safe to remove the entry even if it's in use. */
106 #ifdef CONFIG_PROC_FS
107 remove_proc_entry(c->pde->name, c->pde->parent);
108 #endif
109 return;
110 }
111 local_bh_enable();
112 }
113
114 static struct clusterip_config *
115 __clusterip_config_find(__be32 clusterip)
116 {
117 struct clusterip_config *c;
118
119 list_for_each_entry_rcu(c, &clusterip_configs, list) {
120 if (c->clusterip == clusterip)
121 return c;
122 }
123
124 return NULL;
125 }
126
127 static inline struct clusterip_config *
128 clusterip_config_find_get(__be32 clusterip, int entry)
129 {
130 struct clusterip_config *c;
131
132 rcu_read_lock_bh();
133 c = __clusterip_config_find(clusterip);
134 if (c) {
135 if (unlikely(!atomic_inc_not_zero(&c->refcount)))
136 c = NULL;
137 else if (entry)
138 atomic_inc(&c->entries);
139 }
140 rcu_read_unlock_bh();
141
142 return c;
143 }
144
145 static void
146 clusterip_config_init_nodelist(struct clusterip_config *c,
147 const struct ipt_clusterip_tgt_info *i)
148 {
149 int n;
150
151 for (n = 0; n < i->num_local_nodes; n++)
152 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
153 }
154
155 static struct clusterip_config *
156 clusterip_config_init(const struct ipt_clusterip_tgt_info *i, __be32 ip,
157 struct net_device *dev)
158 {
159 struct clusterip_config *c;
160
161 c = kzalloc(sizeof(*c), GFP_ATOMIC);
162 if (!c)
163 return NULL;
164
165 c->dev = dev;
166 c->clusterip = ip;
167 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
168 c->num_total_nodes = i->num_total_nodes;
169 clusterip_config_init_nodelist(c, i);
170 c->hash_mode = i->hash_mode;
171 c->hash_initval = i->hash_initval;
172 atomic_set(&c->refcount, 1);
173 atomic_set(&c->entries, 1);
174
175 #ifdef CONFIG_PROC_FS
176 {
177 char buffer[16];
178
179 /* create proc dir entry */
180 sprintf(buffer, "%pI4", &ip);
181 c->pde = proc_create_data(buffer, S_IWUSR|S_IRUSR,
182 clusterip_procdir,
183 &clusterip_proc_fops, c);
184 if (!c->pde) {
185 kfree(c);
186 return NULL;
187 }
188 }
189 #endif
190
191 spin_lock_bh(&clusterip_lock);
192 list_add_rcu(&c->list, &clusterip_configs);
193 spin_unlock_bh(&clusterip_lock);
194
195 return c;
196 }
197
198 #ifdef CONFIG_PROC_FS
199 static int
200 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
201 {
202
203 if (nodenum == 0 ||
204 nodenum > c->num_total_nodes)
205 return 1;
206
207 /* check if we already have this number in our bitfield */
208 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
209 return 1;
210
211 return 0;
212 }
213
214 static bool
215 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
216 {
217 if (nodenum == 0 ||
218 nodenum > c->num_total_nodes)
219 return true;
220
221 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
222 return false;
223
224 return true;
225 }
226 #endif
227
228 static inline u_int32_t
229 clusterip_hashfn(const struct sk_buff *skb,
230 const struct clusterip_config *config)
231 {
232 const struct iphdr *iph = ip_hdr(skb);
233 unsigned long hashval;
234 u_int16_t sport, dport;
235 const u_int16_t *ports;
236
237 switch (iph->protocol) {
238 case IPPROTO_TCP:
239 case IPPROTO_UDP:
240 case IPPROTO_UDPLITE:
241 case IPPROTO_SCTP:
242 case IPPROTO_DCCP:
243 case IPPROTO_ICMP:
244 ports = (const void *)iph+iph->ihl*4;
245 sport = ports[0];
246 dport = ports[1];
247 break;
248 default:
249 if (net_ratelimit())
250 pr_info("unknown protocol %u\n", iph->protocol);
251 sport = dport = 0;
252 }
253
254 switch (config->hash_mode) {
255 case CLUSTERIP_HASHMODE_SIP:
256 hashval = jhash_1word(ntohl(iph->saddr),
257 config->hash_initval);
258 break;
259 case CLUSTERIP_HASHMODE_SIP_SPT:
260 hashval = jhash_2words(ntohl(iph->saddr), sport,
261 config->hash_initval);
262 break;
263 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
264 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
265 config->hash_initval);
266 break;
267 default:
268 /* to make gcc happy */
269 hashval = 0;
270 /* This cannot happen, unless the check function wasn't called
271 * at rule load time */
272 pr_info("unknown mode %u\n", config->hash_mode);
273 BUG();
274 break;
275 }
276
277 /* node numbers are 1..n, not 0..n */
278 return (((u64)hashval * config->num_total_nodes) >> 32) + 1;
279 }
280
281 static inline int
282 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
283 {
284 return test_bit(hash - 1, &config->local_nodes);
285 }
286
287 /***********************************************************************
288 * IPTABLES TARGET
289 ***********************************************************************/
290
291 static unsigned int
292 clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par)
293 {
294 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
295 struct nf_conn *ct;
296 enum ip_conntrack_info ctinfo;
297 u_int32_t hash;
298
299 /* don't need to clusterip_config_get() here, since refcount
300 * is only decremented by destroy() - and ip_tables guarantees
301 * that the ->target() function isn't called after ->destroy() */
302
303 ct = nf_ct_get(skb, &ctinfo);
304 if (ct == NULL) {
305 pr_info("no conntrack!\n");
306 return NF_DROP;
307 }
308
309 /* special case: ICMP error handling. conntrack distinguishes between
310 * error messages (RELATED) and information requests (see below) */
311 if (ip_hdr(skb)->protocol == IPPROTO_ICMP &&
312 (ctinfo == IP_CT_RELATED ||
313 ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY))
314 return XT_CONTINUE;
315
316 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
317 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
318 * on, which all have an ID field [relevant for hashing]. */
319
320 hash = clusterip_hashfn(skb, cipinfo->config);
321
322 switch (ctinfo) {
323 case IP_CT_NEW:
324 ct->mark = hash;
325 break;
326 case IP_CT_RELATED:
327 case IP_CT_RELATED+IP_CT_IS_REPLY:
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 nf_ct_dump_tuple_ip(&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 int clusterip_tg_check(const struct xt_tgchk_param *par)
353 {
354 struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
355 const struct ipt_entry *e = par->entryinfo;
356 struct clusterip_config *config;
357 int ret;
358
359 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
360 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
361 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
362 pr_info("unknown mode %u\n", cipinfo->hash_mode);
363 return -EINVAL;
364
365 }
366 if (e->ip.dmsk.s_addr != htonl(0xffffffff) ||
367 e->ip.dst.s_addr == 0) {
368 pr_info("Please specify destination IP\n");
369 return -EINVAL;
370 }
371
372
373 config = clusterip_config_find_get(e->ip.dst.s_addr, 1);
374 if (!config) {
375 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
376 pr_info("no config found for %pI4, need 'new'\n",
377 &e->ip.dst.s_addr);
378 return -EINVAL;
379 } else {
380 struct net_device *dev;
381
382 if (e->ip.iniface[0] == '\0') {
383 pr_info("Please specify an interface name\n");
384 return -EINVAL;
385 }
386
387 dev = dev_get_by_name(&init_net, e->ip.iniface);
388 if (!dev) {
389 pr_info("no such interface %s\n",
390 e->ip.iniface);
391 return -ENOENT;
392 }
393
394 config = clusterip_config_init(cipinfo,
395 e->ip.dst.s_addr, dev);
396 if (!config) {
397 pr_info("cannot allocate config\n");
398 dev_put(dev);
399 return -ENOMEM;
400 }
401 dev_mc_add(config->dev, config->clustermac);
402 }
403 }
404 cipinfo->config = config;
405
406 ret = nf_ct_l3proto_try_module_get(par->family);
407 if (ret < 0)
408 pr_info("cannot load conntrack support for proto=%u\n",
409 par->family);
410 return ret;
411 }
412
413 /* drop reference count of cluster config when rule is deleted */
414 static void clusterip_tg_destroy(const struct xt_tgdtor_param *par)
415 {
416 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
417
418 /* if no more entries are referencing the config, remove it
419 * from the list and destroy the proc entry */
420 clusterip_config_entry_put(cipinfo->config);
421
422 clusterip_config_put(cipinfo->config);
423
424 nf_ct_l3proto_module_put(par->family);
425 }
426
427 #ifdef CONFIG_COMPAT
428 struct compat_ipt_clusterip_tgt_info
429 {
430 u_int32_t flags;
431 u_int8_t clustermac[6];
432 u_int16_t num_total_nodes;
433 u_int16_t num_local_nodes;
434 u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
435 u_int32_t hash_mode;
436 u_int32_t hash_initval;
437 compat_uptr_t config;
438 };
439 #endif /* CONFIG_COMPAT */
440
441 static struct xt_target clusterip_tg_reg __read_mostly = {
442 .name = "CLUSTERIP",
443 .family = NFPROTO_IPV4,
444 .target = clusterip_tg,
445 .checkentry = clusterip_tg_check,
446 .destroy = clusterip_tg_destroy,
447 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
448 #ifdef CONFIG_COMPAT
449 .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
450 #endif /* CONFIG_COMPAT */
451 .me = THIS_MODULE
452 };
453
454
455 /***********************************************************************
456 * ARP MANGLING CODE
457 ***********************************************************************/
458
459 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
460 struct arp_payload {
461 u_int8_t src_hw[ETH_ALEN];
462 __be32 src_ip;
463 u_int8_t dst_hw[ETH_ALEN];
464 __be32 dst_ip;
465 } __packed;
466
467 #ifdef DEBUG
468 static void arp_print(struct arp_payload *payload)
469 {
470 #define HBUFFERLEN 30
471 char hbuffer[HBUFFERLEN];
472 int j,k;
473
474 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
475 hbuffer[k++] = hex_asc_hi(payload->src_hw[j]);
476 hbuffer[k++] = hex_asc_lo(payload->src_hw[j]);
477 hbuffer[k++]=':';
478 }
479 hbuffer[--k]='\0';
480
481 pr_debug("src %pI4@%s, dst %pI4\n",
482 &payload->src_ip, hbuffer, &payload->dst_ip);
483 }
484 #endif
485
486 static unsigned int
487 arp_mangle(unsigned int hook,
488 struct sk_buff *skb,
489 const struct net_device *in,
490 const struct net_device *out,
491 int (*okfn)(struct sk_buff *))
492 {
493 struct arphdr *arp = arp_hdr(skb);
494 struct arp_payload *payload;
495 struct clusterip_config *c;
496
497 /* we don't care about non-ethernet and non-ipv4 ARP */
498 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
499 arp->ar_pro != htons(ETH_P_IP) ||
500 arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
501 return NF_ACCEPT;
502
503 /* we only want to mangle arp requests and replies */
504 if (arp->ar_op != htons(ARPOP_REPLY) &&
505 arp->ar_op != htons(ARPOP_REQUEST))
506 return NF_ACCEPT;
507
508 payload = (void *)(arp+1);
509
510 /* if there is no clusterip configuration for the arp reply's
511 * source ip, we don't want to mangle it */
512 c = clusterip_config_find_get(payload->src_ip, 0);
513 if (!c)
514 return NF_ACCEPT;
515
516 /* normally the linux kernel always replies to arp queries of
517 * addresses on different interfacs. However, in the CLUSTERIP case
518 * this wouldn't work, since we didn't subscribe the mcast group on
519 * other interfaces */
520 if (c->dev != out) {
521 pr_debug("not mangling arp reply on different "
522 "interface: cip'%s'-skb'%s'\n",
523 c->dev->name, out->name);
524 clusterip_config_put(c);
525 return NF_ACCEPT;
526 }
527
528 /* mangle reply hardware address */
529 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
530
531 #ifdef DEBUG
532 pr_debug("mangled arp reply: ");
533 arp_print(payload);
534 #endif
535
536 clusterip_config_put(c);
537
538 return NF_ACCEPT;
539 }
540
541 static struct nf_hook_ops cip_arp_ops __read_mostly = {
542 .hook = arp_mangle,
543 .pf = NFPROTO_ARP,
544 .hooknum = NF_ARP_OUT,
545 .priority = -1
546 };
547
548 /***********************************************************************
549 * PROC DIR HANDLING
550 ***********************************************************************/
551
552 #ifdef CONFIG_PROC_FS
553
554 struct clusterip_seq_position {
555 unsigned int pos; /* position */
556 unsigned int weight; /* number of bits set == size */
557 unsigned int bit; /* current bit */
558 unsigned long val; /* current value */
559 };
560
561 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
562 {
563 struct clusterip_config *c = s->private;
564 unsigned int weight;
565 u_int32_t local_nodes;
566 struct clusterip_seq_position *idx;
567
568 local_nodes = c->local_nodes;
569 weight = hweight32(local_nodes);
570 if (*pos >= weight)
571 return NULL;
572
573 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
574 if (!idx)
575 return ERR_PTR(-ENOMEM);
576
577 idx->pos = *pos;
578 idx->weight = weight;
579 idx->bit = ffs(local_nodes);
580 idx->val = local_nodes;
581 clear_bit(idx->bit - 1, &idx->val);
582
583 return idx;
584 }
585
586 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
587 {
588 struct clusterip_seq_position *idx = v;
589
590 *pos = ++idx->pos;
591 if (*pos >= idx->weight) {
592 kfree(v);
593 return NULL;
594 }
595 idx->bit = ffs(idx->val);
596 clear_bit(idx->bit - 1, &idx->val);
597 return idx;
598 }
599
600 static void clusterip_seq_stop(struct seq_file *s, void *v)
601 {
602 if (!IS_ERR(v))
603 kfree(v);
604 }
605
606 static int clusterip_seq_show(struct seq_file *s, void *v)
607 {
608 struct clusterip_seq_position *idx = v;
609
610 if (idx->pos != 0)
611 seq_putc(s, ',');
612
613 seq_printf(s, "%u", idx->bit);
614
615 if (idx->pos == idx->weight - 1)
616 seq_putc(s, '\n');
617
618 return 0;
619 }
620
621 static const struct seq_operations clusterip_seq_ops = {
622 .start = clusterip_seq_start,
623 .next = clusterip_seq_next,
624 .stop = clusterip_seq_stop,
625 .show = clusterip_seq_show,
626 };
627
628 static int clusterip_proc_open(struct inode *inode, struct file *file)
629 {
630 int ret = seq_open(file, &clusterip_seq_ops);
631
632 if (!ret) {
633 struct seq_file *sf = file->private_data;
634 struct clusterip_config *c = PDE(inode)->data;
635
636 sf->private = c;
637
638 clusterip_config_get(c);
639 }
640
641 return ret;
642 }
643
644 static int clusterip_proc_release(struct inode *inode, struct file *file)
645 {
646 struct clusterip_config *c = PDE(inode)->data;
647 int ret;
648
649 ret = seq_release(inode, file);
650
651 if (!ret)
652 clusterip_config_put(c);
653
654 return ret;
655 }
656
657 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
658 size_t size, loff_t *ofs)
659 {
660 struct clusterip_config *c = PDE(file->f_path.dentry->d_inode)->data;
661 #define PROC_WRITELEN 10
662 char buffer[PROC_WRITELEN+1];
663 unsigned long nodenum;
664
665 if (copy_from_user(buffer, input, PROC_WRITELEN))
666 return -EFAULT;
667
668 if (*buffer == '+') {
669 nodenum = simple_strtoul(buffer+1, NULL, 10);
670 if (clusterip_add_node(c, nodenum))
671 return -ENOMEM;
672 } else if (*buffer == '-') {
673 nodenum = simple_strtoul(buffer+1, NULL,10);
674 if (clusterip_del_node(c, nodenum))
675 return -ENOENT;
676 } else
677 return -EIO;
678
679 return size;
680 }
681
682 static const struct file_operations clusterip_proc_fops = {
683 .owner = THIS_MODULE,
684 .open = clusterip_proc_open,
685 .read = seq_read,
686 .write = clusterip_proc_write,
687 .llseek = seq_lseek,
688 .release = clusterip_proc_release,
689 };
690
691 #endif /* CONFIG_PROC_FS */
692
693 static int __init clusterip_tg_init(void)
694 {
695 int ret;
696
697 ret = xt_register_target(&clusterip_tg_reg);
698 if (ret < 0)
699 return ret;
700
701 ret = nf_register_hook(&cip_arp_ops);
702 if (ret < 0)
703 goto cleanup_target;
704
705 #ifdef CONFIG_PROC_FS
706 clusterip_procdir = proc_mkdir("ipt_CLUSTERIP", init_net.proc_net);
707 if (!clusterip_procdir) {
708 pr_err("Unable to proc dir entry\n");
709 ret = -ENOMEM;
710 goto cleanup_hook;
711 }
712 #endif /* CONFIG_PROC_FS */
713
714 pr_info("ClusterIP Version %s loaded successfully\n",
715 CLUSTERIP_VERSION);
716 return 0;
717
718 #ifdef CONFIG_PROC_FS
719 cleanup_hook:
720 nf_unregister_hook(&cip_arp_ops);
721 #endif /* CONFIG_PROC_FS */
722 cleanup_target:
723 xt_unregister_target(&clusterip_tg_reg);
724 return ret;
725 }
726
727 static void __exit clusterip_tg_exit(void)
728 {
729 pr_info("ClusterIP Version %s unloading\n", CLUSTERIP_VERSION);
730 #ifdef CONFIG_PROC_FS
731 remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
732 #endif
733 nf_unregister_hook(&cip_arp_ops);
734 xt_unregister_target(&clusterip_tg_reg);
735
736 /* Wait for completion of call_rcu_bh()'s (clusterip_config_rcu_free) */
737 rcu_barrier_bh();
738 }
739
740 module_init(clusterip_tg_init);
741 module_exit(clusterip_tg_exit);
Tomato firmware and modifications.