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[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 #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/netns/generic.h>
32 #include <net/checksum.h>
33 #include <net/ip.h>
34
35 #define CLUSTERIP_VERSION "0.8"
36
37 MODULE_LICENSE("GPL");
38 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
39 MODULE_DESCRIPTION("Xtables: CLUSTERIP target");
40
41 struct clusterip_config {
42 struct list_head list; /* list of all configs */
43 atomic_t refcount; /* reference count */
44 atomic_t entries; /* number of entries/rules
45 * referencing us */
46
47 __be32 clusterip; /* the IP address */
48 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
49 struct net_device *dev; /* device */
50 u_int16_t num_total_nodes; /* total number of nodes */
51 unsigned long local_nodes; /* node number array */
52
53 #ifdef CONFIG_PROC_FS
54 struct proc_dir_entry *pde; /* proc dir entry */
55 #endif
56 enum clusterip_hashmode hash_mode; /* which hashing mode */
57 u_int32_t hash_initval; /* hash initialization */
58 struct rcu_head rcu;
59 };
60
61 #ifdef CONFIG_PROC_FS
62 static const struct file_operations clusterip_proc_fops;
63 #endif
64
65 static int clusterip_net_id __read_mostly;
66
67 struct clusterip_net {
68 struct list_head configs;
69 /* lock protects the configs list */
70 spinlock_t lock;
71
72 #ifdef CONFIG_PROC_FS
73 struct proc_dir_entry *procdir;
74 #endif
75 };
76
77 static inline void
78 clusterip_config_get(struct clusterip_config *c)
79 {
80 atomic_inc(&c->refcount);
81 }
82
83
84 static void clusterip_config_rcu_free(struct rcu_head *head)
85 {
86 kfree(container_of(head, struct clusterip_config, rcu));
87 }
88
89 static inline void
90 clusterip_config_put(struct clusterip_config *c)
91 {
92 if (atomic_dec_and_test(&c->refcount))
93 call_rcu_bh(&c->rcu, clusterip_config_rcu_free);
94 }
95
96 /* decrease the count of entries using/referencing this config. If last
97 * entry(rule) is removed, remove the config from lists, but don't free it
98 * yet, since proc-files could still be holding references */
99 static inline void
100 clusterip_config_entry_put(struct clusterip_config *c)
101 {
102 struct clusterip_net *cn = net_generic(&init_net, clusterip_net_id);
103
104 local_bh_disable();
105 if (atomic_dec_and_lock(&c->entries, &cn->lock)) {
106 list_del_rcu(&c->list);
107 spin_unlock(&cn->lock);
108 local_bh_enable();
109
110 dev_mc_del(c->dev, c->clustermac);
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 proc_remove(c->pde);
118 #endif
119 return;
120 }
121 local_bh_enable();
122 }
123
124 static struct clusterip_config *
125 __clusterip_config_find(struct net *net, __be32 clusterip)
126 {
127 struct clusterip_config *c;
128 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
129
130 list_for_each_entry_rcu(c, &cn->configs, list) {
131 if (c->clusterip == clusterip)
132 return c;
133 }
134
135 return NULL;
136 }
137
138 static inline struct clusterip_config *
139 clusterip_config_find_get(struct net *net, __be32 clusterip, int entry)
140 {
141 struct clusterip_config *c;
142
143 rcu_read_lock_bh();
144 c = __clusterip_config_find(net, clusterip);
145 if (c) {
146 if (unlikely(!atomic_inc_not_zero(&c->refcount)))
147 c = NULL;
148 else if (entry)
149 atomic_inc(&c->entries);
150 }
151 rcu_read_unlock_bh();
152
153 return c;
154 }
155
156 static void
157 clusterip_config_init_nodelist(struct clusterip_config *c,
158 const struct ipt_clusterip_tgt_info *i)
159 {
160 int n;
161
162 for (n = 0; n < i->num_local_nodes; n++)
163 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
164 }
165
166 static struct clusterip_config *
167 clusterip_config_init(const struct ipt_clusterip_tgt_info *i, __be32 ip,
168 struct net_device *dev)
169 {
170 struct clusterip_config *c;
171 struct clusterip_net *cn = net_generic(dev_net(dev), clusterip_net_id);
172
173 c = kzalloc(sizeof(*c), GFP_ATOMIC);
174 if (!c)
175 return NULL;
176
177 c->dev = dev;
178 c->clusterip = ip;
179 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
180 c->num_total_nodes = i->num_total_nodes;
181 clusterip_config_init_nodelist(c, i);
182 c->hash_mode = i->hash_mode;
183 c->hash_initval = i->hash_initval;
184 atomic_set(&c->refcount, 1);
185 atomic_set(&c->entries, 1);
186
187 #ifdef CONFIG_PROC_FS
188 {
189 char buffer[16];
190
191 /* create proc dir entry */
192 sprintf(buffer, "%pI4", &ip);
193 c->pde = proc_create_data(buffer, S_IWUSR|S_IRUSR,
194 cn->procdir,
195 &clusterip_proc_fops, c);
196 if (!c->pde) {
197 kfree(c);
198 return NULL;
199 }
200 }
201 #endif
202
203 spin_lock_bh(&cn->lock);
204 list_add_rcu(&c->list, &cn->configs);
205 spin_unlock_bh(&cn->lock);
206
207 return c;
208 }
209
210 #ifdef CONFIG_PROC_FS
211 static int
212 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
213 {
214
215 if (nodenum == 0 ||
216 nodenum > c->num_total_nodes)
217 return 1;
218
219 /* check if we already have this number in our bitfield */
220 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
221 return 1;
222
223 return 0;
224 }
225
226 static bool
227 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
228 {
229 if (nodenum == 0 ||
230 nodenum > c->num_total_nodes)
231 return true;
232
233 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
234 return false;
235
236 return true;
237 }
238 #endif
239
240 static inline u_int32_t
241 clusterip_hashfn(const struct sk_buff *skb,
242 const struct clusterip_config *config)
243 {
244 const struct iphdr *iph = ip_hdr(skb);
245 unsigned long hashval;
246 u_int16_t sport = 0, dport = 0;
247 int poff;
248
249 poff = proto_ports_offset(iph->protocol);
250 if (poff >= 0) {
251 const u_int16_t *ports;
252 u16 _ports[2];
253
254 ports = skb_header_pointer(skb, iph->ihl * 4 + poff, 4, _ports);
255 if (ports) {
256 sport = ports[0];
257 dport = ports[1];
258 }
259 } else {
260 net_info_ratelimited("unknown protocol %u\n", iph->protocol);
261 }
262
263 switch (config->hash_mode) {
264 case CLUSTERIP_HASHMODE_SIP:
265 hashval = jhash_1word(ntohl(iph->saddr),
266 config->hash_initval);
267 break;
268 case CLUSTERIP_HASHMODE_SIP_SPT:
269 hashval = jhash_2words(ntohl(iph->saddr), sport,
270 config->hash_initval);
271 break;
272 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
273 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
274 config->hash_initval);
275 break;
276 default:
277 /* to make gcc happy */
278 hashval = 0;
279 /* This cannot happen, unless the check function wasn't called
280 * at rule load time */
281 pr_info("unknown mode %u\n", config->hash_mode);
282 BUG();
283 break;
284 }
285
286 /* node numbers are 1..n, not 0..n */
287 return (((u64)hashval * config->num_total_nodes) >> 32) + 1;
288 }
289
290 static inline int
291 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
292 {
293 return test_bit(hash - 1, &config->local_nodes);
294 }
295
296 /***********************************************************************
297 * IPTABLES TARGET
298 ***********************************************************************/
299
300 static unsigned int
301 clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par)
302 {
303 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
304 struct nf_conn *ct;
305 enum ip_conntrack_info ctinfo;
306 u_int32_t hash;
307
308 /* don't need to clusterip_config_get() here, since refcount
309 * is only decremented by destroy() - and ip_tables guarantees
310 * that the ->target() function isn't called after ->destroy() */
311
312 ct = nf_ct_get(skb, &ctinfo);
313 if (ct == NULL)
314 return NF_DROP;
315
316 /* special case: ICMP error handling. conntrack distinguishes between
317 * error messages (RELATED) and information requests (see below) */
318 if (ip_hdr(skb)->protocol == IPPROTO_ICMP &&
319 (ctinfo == IP_CT_RELATED ||
320 ctinfo == IP_CT_RELATED_REPLY))
321 return XT_CONTINUE;
322
323 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
324 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
325 * on, which all have an ID field [relevant for hashing]. */
326
327 hash = clusterip_hashfn(skb, cipinfo->config);
328
329 switch (ctinfo) {
330 case IP_CT_NEW:
331 ct->mark = hash;
332 break;
333 case IP_CT_RELATED:
334 case IP_CT_RELATED_REPLY:
335 /* FIXME: we don't handle expectations at the moment.
336 * They can arrive on a different node than
337 * the master connection (e.g. FTP passive mode) */
338 case IP_CT_ESTABLISHED:
339 case IP_CT_ESTABLISHED_REPLY:
340 break;
341 default: /* Prevent gcc warnings */
342 break;
343 }
344
345 #ifdef DEBUG
346 nf_ct_dump_tuple_ip(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
347 #endif
348 pr_debug("hash=%u ct_hash=%u ", hash, ct->mark);
349 if (!clusterip_responsible(cipinfo->config, hash)) {
350 pr_debug("not responsible\n");
351 return NF_DROP;
352 }
353 pr_debug("responsible\n");
354
355 /* despite being received via linklayer multicast, this is
356 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
357 skb->pkt_type = PACKET_HOST;
358
359 return XT_CONTINUE;
360 }
361
362 static int clusterip_tg_check(const struct xt_tgchk_param *par)
363 {
364 struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
365 const struct ipt_entry *e = par->entryinfo;
366 struct clusterip_config *config;
367 int ret;
368
369 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
370 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
371 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
372 pr_info("unknown mode %u\n", cipinfo->hash_mode);
373 return -EINVAL;
374
375 }
376 if (e->ip.dmsk.s_addr != htonl(0xffffffff) ||
377 e->ip.dst.s_addr == 0) {
378 pr_info("Please specify destination IP\n");
379 return -EINVAL;
380 }
381
382 /* FIXME: further sanity checks */
383
384 config = clusterip_config_find_get(&init_net, e->ip.dst.s_addr, 1);
385 if (!config) {
386 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
387 pr_info("no config found for %pI4, need 'new'\n",
388 &e->ip.dst.s_addr);
389 return -EINVAL;
390 } else {
391 struct net_device *dev;
392
393 if (e->ip.iniface[0] == '\0') {
394 pr_info("Please specify an interface name\n");
395 return -EINVAL;
396 }
397
398 dev = dev_get_by_name(&init_net, e->ip.iniface);
399 if (!dev) {
400 pr_info("no such interface %s\n",
401 e->ip.iniface);
402 return -ENOENT;
403 }
404
405 config = clusterip_config_init(cipinfo,
406 e->ip.dst.s_addr, dev);
407 if (!config) {
408 dev_put(dev);
409 return -ENOMEM;
410 }
411 dev_mc_add(config->dev, config->clustermac);
412 }
413 }
414 cipinfo->config = config;
415
416 ret = nf_ct_l3proto_try_module_get(par->family);
417 if (ret < 0)
418 pr_info("cannot load conntrack support for proto=%u\n",
419 par->family);
420 return ret;
421 }
422
423 /* drop reference count of cluster config when rule is deleted */
424 static void clusterip_tg_destroy(const struct xt_tgdtor_param *par)
425 {
426 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
427
428 /* if no more entries are referencing the config, remove it
429 * from the list and destroy the proc entry */
430 clusterip_config_entry_put(cipinfo->config);
431
432 clusterip_config_put(cipinfo->config);
433
434 nf_ct_l3proto_module_put(par->family);
435 }
436
437 #ifdef CONFIG_COMPAT
438 struct compat_ipt_clusterip_tgt_info
439 {
440 u_int32_t flags;
441 u_int8_t clustermac[6];
442 u_int16_t num_total_nodes;
443 u_int16_t num_local_nodes;
444 u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
445 u_int32_t hash_mode;
446 u_int32_t hash_initval;
447 compat_uptr_t config;
448 };
449 #endif /* CONFIG_COMPAT */
450
451 static struct xt_target clusterip_tg_reg __read_mostly = {
452 .name = "CLUSTERIP",
453 .family = NFPROTO_IPV4,
454 .target = clusterip_tg,
455 .checkentry = clusterip_tg_check,
456 .destroy = clusterip_tg_destroy,
457 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
458 #ifdef CONFIG_COMPAT
459 .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
460 #endif /* CONFIG_COMPAT */
461 .me = THIS_MODULE
462 };
463
464
465 /***********************************************************************
466 * ARP MANGLING CODE
467 ***********************************************************************/
468
469 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
470 struct arp_payload {
471 u_int8_t src_hw[ETH_ALEN];
472 __be32 src_ip;
473 u_int8_t dst_hw[ETH_ALEN];
474 __be32 dst_ip;
475 } __packed;
476
477 #ifdef DEBUG
478 static void arp_print(struct arp_payload *payload)
479 {
480 #define HBUFFERLEN 30
481 char hbuffer[HBUFFERLEN];
482 int j,k;
483
484 for (k=0, j=0; k < HBUFFERLEN-3 && j < ETH_ALEN; j++) {
485 hbuffer[k++] = hex_asc_hi(payload->src_hw[j]);
486 hbuffer[k++] = hex_asc_lo(payload->src_hw[j]);
487 hbuffer[k++]=':';
488 }
489 hbuffer[--k]='\0';
490
491 pr_debug("src %pI4@%s, dst %pI4\n",
492 &payload->src_ip, hbuffer, &payload->dst_ip);
493 }
494 #endif
495
496 static unsigned int
497 arp_mangle(unsigned int hook,
498 struct sk_buff *skb,
499 const struct net_device *in,
500 const struct net_device *out,
501 int (*okfn)(struct sk_buff *))
502 {
503 struct arphdr *arp = arp_hdr(skb);
504 struct arp_payload *payload;
505 struct clusterip_config *c;
506
507 /* we don't care about non-ethernet and non-ipv4 ARP */
508 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
509 arp->ar_pro != htons(ETH_P_IP) ||
510 arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
511 return NF_ACCEPT;
512
513 /* we only want to mangle arp requests and replies */
514 if (arp->ar_op != htons(ARPOP_REPLY) &&
515 arp->ar_op != htons(ARPOP_REQUEST))
516 return NF_ACCEPT;
517
518 payload = (void *)(arp+1);
519
520 /* if there is no clusterip configuration for the arp reply's
521 * source ip, we don't want to mangle it */
522 c = clusterip_config_find_get(&init_net, payload->src_ip, 0);
523 if (!c)
524 return NF_ACCEPT;
525
526 /* normally the linux kernel always replies to arp queries of
527 * addresses on different interfacs. However, in the CLUSTERIP case
528 * this wouldn't work, since we didn't subscribe the mcast group on
529 * other interfaces */
530 if (c->dev != out) {
531 pr_debug("not mangling arp reply on different "
532 "interface: cip'%s'-skb'%s'\n",
533 c->dev->name, out->name);
534 clusterip_config_put(c);
535 return NF_ACCEPT;
536 }
537
538 /* mangle reply hardware address */
539 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
540
541 #ifdef DEBUG
542 pr_debug("mangled arp reply: ");
543 arp_print(payload);
544 #endif
545
546 clusterip_config_put(c);
547
548 return NF_ACCEPT;
549 }
550
551 static struct nf_hook_ops cip_arp_ops __read_mostly = {
552 .hook = arp_mangle,
553 .pf = NFPROTO_ARP,
554 .hooknum = NF_ARP_OUT,
555 .priority = -1
556 };
557
558 /***********************************************************************
559 * PROC DIR HANDLING
560 ***********************************************************************/
561
562 #ifdef CONFIG_PROC_FS
563
564 struct clusterip_seq_position {
565 unsigned int pos; /* position */
566 unsigned int weight; /* number of bits set == size */
567 unsigned int bit; /* current bit */
568 unsigned long val; /* current value */
569 };
570
571 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
572 {
573 struct clusterip_config *c = s->private;
574 unsigned int weight;
575 u_int32_t local_nodes;
576 struct clusterip_seq_position *idx;
577
578 /* FIXME: possible race */
579 local_nodes = c->local_nodes;
580 weight = hweight32(local_nodes);
581 if (*pos >= weight)
582 return NULL;
583
584 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
585 if (!idx)
586 return ERR_PTR(-ENOMEM);
587
588 idx->pos = *pos;
589 idx->weight = weight;
590 idx->bit = ffs(local_nodes);
591 idx->val = local_nodes;
592 clear_bit(idx->bit - 1, &idx->val);
593
594 return idx;
595 }
596
597 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
598 {
599 struct clusterip_seq_position *idx = v;
600
601 *pos = ++idx->pos;
602 if (*pos >= idx->weight) {
603 kfree(v);
604 return NULL;
605 }
606 idx->bit = ffs(idx->val);
607 clear_bit(idx->bit - 1, &idx->val);
608 return idx;
609 }
610
611 static void clusterip_seq_stop(struct seq_file *s, void *v)
612 {
613 if (!IS_ERR(v))
614 kfree(v);
615 }
616
617 static int clusterip_seq_show(struct seq_file *s, void *v)
618 {
619 struct clusterip_seq_position *idx = v;
620
621 if (idx->pos != 0)
622 seq_putc(s, ',');
623
624 seq_printf(s, "%u", idx->bit);
625
626 if (idx->pos == idx->weight - 1)
627 seq_putc(s, '\n');
628
629 return 0;
630 }
631
632 static const struct seq_operations clusterip_seq_ops = {
633 .start = clusterip_seq_start,
634 .next = clusterip_seq_next,
635 .stop = clusterip_seq_stop,
636 .show = clusterip_seq_show,
637 };
638
639 static int clusterip_proc_open(struct inode *inode, struct file *file)
640 {
641 int ret = seq_open(file, &clusterip_seq_ops);
642
643 if (!ret) {
644 struct seq_file *sf = file->private_data;
645 struct clusterip_config *c = PDE_DATA(inode);
646
647 sf->private = c;
648
649 clusterip_config_get(c);
650 }
651
652 return ret;
653 }
654
655 static int clusterip_proc_release(struct inode *inode, struct file *file)
656 {
657 struct clusterip_config *c = PDE_DATA(inode);
658 int ret;
659
660 ret = seq_release(inode, file);
661
662 if (!ret)
663 clusterip_config_put(c);
664
665 return ret;
666 }
667
668 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
669 size_t size, loff_t *ofs)
670 {
671 struct clusterip_config *c = PDE_DATA(file_inode(file));
672 #define PROC_WRITELEN 10
673 char buffer[PROC_WRITELEN+1];
674 unsigned long nodenum;
675 int rc;
676
677 if (size > PROC_WRITELEN)
678 return -EIO;
679 if (copy_from_user(buffer, input, size))
680 return -EFAULT;
681 buffer[size] = 0;
682
683 if (*buffer == '+') {
684 rc = kstrtoul(buffer+1, 10, &nodenum);
685 if (rc)
686 return rc;
687 if (clusterip_add_node(c, nodenum))
688 return -ENOMEM;
689 } else if (*buffer == '-') {
690 rc = kstrtoul(buffer+1, 10, &nodenum);
691 if (rc)
692 return rc;
693 if (clusterip_del_node(c, nodenum))
694 return -ENOENT;
695 } else
696 return -EIO;
697
698 return size;
699 }
700
701 static const struct file_operations clusterip_proc_fops = {
702 .owner = THIS_MODULE,
703 .open = clusterip_proc_open,
704 .read = seq_read,
705 .write = clusterip_proc_write,
706 .llseek = seq_lseek,
707 .release = clusterip_proc_release,
708 };
709
710 #endif /* CONFIG_PROC_FS */
711
712 static int clusterip_net_init(struct net *net)
713 {
714 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
715
716 INIT_LIST_HEAD(&cn->configs);
717
718 spin_lock_init(&cn->lock);
719
720 #ifdef CONFIG_PROC_FS
721 cn->procdir = proc_mkdir("ipt_CLUSTERIP", net->proc_net);
722 if (!cn->procdir) {
723 pr_err("Unable to proc dir entry\n");
724 return -ENOMEM;
725 }
726 #endif /* CONFIG_PROC_FS */
727
728 return 0;
729 }
730
731 static void clusterip_net_exit(struct net *net)
732 {
733 #ifdef CONFIG_PROC_FS
734 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
735 proc_remove(cn->procdir);
736 #endif
737 }
738
739 static struct pernet_operations clusterip_net_ops = {
740 .init = clusterip_net_init,
741 .exit = clusterip_net_exit,
742 .id = &clusterip_net_id,
743 .size = sizeof(struct clusterip_net),
744 };
745
746 static int __init clusterip_tg_init(void)
747 {
748 int ret;
749
750 ret = register_pernet_subsys(&clusterip_net_ops);
751 if (ret < 0)
752 return ret;
753
754 ret = xt_register_target(&clusterip_tg_reg);
755 if (ret < 0)
756 goto cleanup_subsys;
757
758 ret = nf_register_hook(&cip_arp_ops);
759 if (ret < 0)
760 goto cleanup_target;
761
762 pr_info("ClusterIP Version %s loaded successfully\n",
763 CLUSTERIP_VERSION);
764
765 return 0;
766
767 cleanup_target:
768 xt_unregister_target(&clusterip_tg_reg);
769 cleanup_subsys:
770 unregister_pernet_subsys(&clusterip_net_ops);
771 return ret;
772 }
773
774 static void __exit clusterip_tg_exit(void)
775 {
776 pr_info("ClusterIP Version %s unloading\n", CLUSTERIP_VERSION);
777
778 nf_unregister_hook(&cip_arp_ops);
779 xt_unregister_target(&clusterip_tg_reg);
780 unregister_pernet_subsys(&clusterip_net_ops);
781
782 /* Wait for completion of call_rcu_bh()'s (clusterip_config_rcu_free) */
783 rcu_barrier_bh();
784 }
785
786 module_init(clusterip_tg_init);
787 module_exit(clusterip_tg_exit);
Linux kernel - Deliverables
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