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[mirror_ubuntu-bionic-kernel.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/refcount.h>
26 #include <linux/netfilter_arp.h>
27 #include <linux/netfilter/x_tables.h>
28 #include <linux/netfilter_ipv4/ip_tables.h>
29 #include <linux/netfilter_ipv4/ipt_CLUSTERIP.h>
30 #include <net/netfilter/nf_conntrack.h>
31 #include <net/net_namespace.h>
32 #include <net/netns/generic.h>
33 #include <net/checksum.h>
34 #include <net/ip.h>
35
36 #define CLUSTERIP_VERSION "0.8"
37
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
40 MODULE_DESCRIPTION("Xtables: CLUSTERIP target");
41
42 struct clusterip_config {
43 struct list_head list; /* list of all configs */
44 refcount_t refcount; /* reference count */
45 refcount_t entries; /* number of entries/rules
46 * referencing us */
47
48 __be32 clusterip; /* the IP address */
49 u_int8_t clustermac[ETH_ALEN]; /* the MAC address */
50 int ifindex; /* device ifindex */
51 u_int16_t num_total_nodes; /* total number of nodes */
52 unsigned long local_nodes; /* node number array */
53
54 #ifdef CONFIG_PROC_FS
55 struct proc_dir_entry *pde; /* proc dir entry */
56 #endif
57 enum clusterip_hashmode hash_mode; /* which hashing mode */
58 u_int32_t hash_initval; /* hash initialization */
59 struct rcu_head rcu;
60
61 char ifname[IFNAMSIZ]; /* device ifname */
62 struct notifier_block notifier; /* refresh c->ifindex in it */
63 };
64
65 #ifdef CONFIG_PROC_FS
66 static const struct file_operations clusterip_proc_fops;
67 #endif
68
69 static unsigned int clusterip_net_id __read_mostly;
70
71 struct clusterip_net {
72 struct list_head configs;
73 /* lock protects the configs list */
74 spinlock_t lock;
75
76 #ifdef CONFIG_PROC_FS
77 struct proc_dir_entry *procdir;
78 #endif
79 };
80
81 static inline void
82 clusterip_config_get(struct clusterip_config *c)
83 {
84 refcount_inc(&c->refcount);
85 }
86
87
88 static void clusterip_config_rcu_free(struct rcu_head *head)
89 {
90 kfree(container_of(head, struct clusterip_config, rcu));
91 }
92
93 static inline void
94 clusterip_config_put(struct clusterip_config *c)
95 {
96 if (refcount_dec_and_test(&c->refcount))
97 call_rcu_bh(&c->rcu, clusterip_config_rcu_free);
98 }
99
100 /* decrease the count of entries using/referencing this config. If last
101 * entry(rule) is removed, remove the config from lists, but don't free it
102 * yet, since proc-files could still be holding references */
103 static inline void
104 clusterip_config_entry_put(struct net *net, struct clusterip_config *c)
105 {
106 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
107
108 local_bh_disable();
109 if (refcount_dec_and_lock(&c->entries, &cn->lock)) {
110 list_del_rcu(&c->list);
111 spin_unlock(&cn->lock);
112 local_bh_enable();
113
114 unregister_netdevice_notifier(&c->notifier);
115
116 /* In case anyone still accesses the file, the open/close
117 * functions are also incrementing the refcount on their own,
118 * so it's safe to remove the entry even if it's in use. */
119 #ifdef CONFIG_PROC_FS
120 if (cn->procdir)
121 proc_remove(c->pde);
122 #endif
123 return;
124 }
125 local_bh_enable();
126 }
127
128 static struct clusterip_config *
129 __clusterip_config_find(struct net *net, __be32 clusterip)
130 {
131 struct clusterip_config *c;
132 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
133
134 list_for_each_entry_rcu(c, &cn->configs, list) {
135 if (c->clusterip == clusterip)
136 return c;
137 }
138
139 return NULL;
140 }
141
142 static inline struct clusterip_config *
143 clusterip_config_find_get(struct net *net, __be32 clusterip, int entry)
144 {
145 struct clusterip_config *c;
146
147 rcu_read_lock_bh();
148 c = __clusterip_config_find(net, clusterip);
149 if (c) {
150 #ifdef CONFIG_PROC_FS
151 if (!c->pde)
152 c = NULL;
153 else
154 #endif
155 if (unlikely(!refcount_inc_not_zero(&c->refcount)))
156 c = NULL;
157 else if (entry)
158 refcount_inc(&c->entries);
159 }
160 rcu_read_unlock_bh();
161
162 return c;
163 }
164
165 static void
166 clusterip_config_init_nodelist(struct clusterip_config *c,
167 const struct ipt_clusterip_tgt_info *i)
168 {
169 int n;
170
171 for (n = 0; n < i->num_local_nodes; n++)
172 set_bit(i->local_nodes[n] - 1, &c->local_nodes);
173 }
174
175 static int
176 clusterip_netdev_event(struct notifier_block *this, unsigned long event,
177 void *ptr)
178 {
179 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
180 struct clusterip_config *c;
181
182 c = container_of(this, struct clusterip_config, notifier);
183 switch (event) {
184 case NETDEV_REGISTER:
185 if (!strcmp(dev->name, c->ifname)) {
186 c->ifindex = dev->ifindex;
187 dev_mc_add(dev, c->clustermac);
188 }
189 break;
190 case NETDEV_UNREGISTER:
191 if (dev->ifindex == c->ifindex) {
192 dev_mc_del(dev, c->clustermac);
193 c->ifindex = -1;
194 }
195 break;
196 case NETDEV_CHANGENAME:
197 if (!strcmp(dev->name, c->ifname)) {
198 c->ifindex = dev->ifindex;
199 dev_mc_add(dev, c->clustermac);
200 } else if (dev->ifindex == c->ifindex) {
201 dev_mc_del(dev, c->clustermac);
202 c->ifindex = -1;
203 }
204 break;
205 }
206
207 return NOTIFY_DONE;
208 }
209
210 static struct clusterip_config *
211 clusterip_config_init(struct net *net, const struct ipt_clusterip_tgt_info *i,
212 __be32 ip, const char *iniface)
213 {
214 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
215 struct clusterip_config *c;
216 int err;
217
218 c = kzalloc(sizeof(*c), GFP_ATOMIC);
219 if (!c)
220 return ERR_PTR(-ENOMEM);
221
222 strcpy(c->ifname, iniface);
223 c->ifindex = -1;
224 c->clusterip = ip;
225 memcpy(&c->clustermac, &i->clustermac, ETH_ALEN);
226 c->num_total_nodes = i->num_total_nodes;
227 clusterip_config_init_nodelist(c, i);
228 c->hash_mode = i->hash_mode;
229 c->hash_initval = i->hash_initval;
230 refcount_set(&c->refcount, 1);
231 refcount_set(&c->entries, 1);
232
233 spin_lock_bh(&cn->lock);
234 if (__clusterip_config_find(net, ip)) {
235 spin_unlock_bh(&cn->lock);
236 kfree(c);
237
238 return ERR_PTR(-EBUSY);
239 }
240
241 list_add_rcu(&c->list, &cn->configs);
242 spin_unlock_bh(&cn->lock);
243
244 #ifdef CONFIG_PROC_FS
245 {
246 char buffer[16];
247
248 /* create proc dir entry */
249 sprintf(buffer, "%pI4", &ip);
250 c->pde = proc_create_data(buffer, S_IWUSR|S_IRUSR,
251 cn->procdir,
252 &clusterip_proc_fops, c);
253 if (!c->pde) {
254 err = -ENOMEM;
255 goto err;
256 }
257 }
258 #endif
259
260 c->notifier.notifier_call = clusterip_netdev_event;
261 err = register_netdevice_notifier(&c->notifier);
262 if (!err)
263 return c;
264
265 #ifdef CONFIG_PROC_FS
266 proc_remove(c->pde);
267 err:
268 #endif
269 spin_lock_bh(&cn->lock);
270 list_del_rcu(&c->list);
271 spin_unlock_bh(&cn->lock);
272 kfree(c);
273
274 return ERR_PTR(err);
275 }
276
277 #ifdef CONFIG_PROC_FS
278 static int
279 clusterip_add_node(struct clusterip_config *c, u_int16_t nodenum)
280 {
281
282 if (nodenum == 0 ||
283 nodenum > c->num_total_nodes)
284 return 1;
285
286 /* check if we already have this number in our bitfield */
287 if (test_and_set_bit(nodenum - 1, &c->local_nodes))
288 return 1;
289
290 return 0;
291 }
292
293 static bool
294 clusterip_del_node(struct clusterip_config *c, u_int16_t nodenum)
295 {
296 if (nodenum == 0 ||
297 nodenum > c->num_total_nodes)
298 return true;
299
300 if (test_and_clear_bit(nodenum - 1, &c->local_nodes))
301 return false;
302
303 return true;
304 }
305 #endif
306
307 static inline u_int32_t
308 clusterip_hashfn(const struct sk_buff *skb,
309 const struct clusterip_config *config)
310 {
311 const struct iphdr *iph = ip_hdr(skb);
312 unsigned long hashval;
313 u_int16_t sport = 0, dport = 0;
314 int poff;
315
316 poff = proto_ports_offset(iph->protocol);
317 if (poff >= 0) {
318 const u_int16_t *ports;
319 u16 _ports[2];
320
321 ports = skb_header_pointer(skb, iph->ihl * 4 + poff, 4, _ports);
322 if (ports) {
323 sport = ports[0];
324 dport = ports[1];
325 }
326 } else {
327 net_info_ratelimited("unknown protocol %u\n", iph->protocol);
328 }
329
330 switch (config->hash_mode) {
331 case CLUSTERIP_HASHMODE_SIP:
332 hashval = jhash_1word(ntohl(iph->saddr),
333 config->hash_initval);
334 break;
335 case CLUSTERIP_HASHMODE_SIP_SPT:
336 hashval = jhash_2words(ntohl(iph->saddr), sport,
337 config->hash_initval);
338 break;
339 case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
340 hashval = jhash_3words(ntohl(iph->saddr), sport, dport,
341 config->hash_initval);
342 break;
343 default:
344 /* to make gcc happy */
345 hashval = 0;
346 /* This cannot happen, unless the check function wasn't called
347 * at rule load time */
348 pr_info("unknown mode %u\n", config->hash_mode);
349 BUG();
350 break;
351 }
352
353 /* node numbers are 1..n, not 0..n */
354 return reciprocal_scale(hashval, config->num_total_nodes) + 1;
355 }
356
357 static inline int
358 clusterip_responsible(const struct clusterip_config *config, u_int32_t hash)
359 {
360 return test_bit(hash - 1, &config->local_nodes);
361 }
362
363 /***********************************************************************
364 * IPTABLES TARGET
365 ***********************************************************************/
366
367 static unsigned int
368 clusterip_tg(struct sk_buff *skb, const struct xt_action_param *par)
369 {
370 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
371 struct nf_conn *ct;
372 enum ip_conntrack_info ctinfo;
373 u_int32_t hash;
374
375 /* don't need to clusterip_config_get() here, since refcount
376 * is only decremented by destroy() - and ip_tables guarantees
377 * that the ->target() function isn't called after ->destroy() */
378
379 ct = nf_ct_get(skb, &ctinfo);
380 if (ct == NULL)
381 return NF_DROP;
382
383 /* special case: ICMP error handling. conntrack distinguishes between
384 * error messages (RELATED) and information requests (see below) */
385 if (ip_hdr(skb)->protocol == IPPROTO_ICMP &&
386 (ctinfo == IP_CT_RELATED ||
387 ctinfo == IP_CT_RELATED_REPLY))
388 return XT_CONTINUE;
389
390 /* ip_conntrack_icmp guarantees us that we only have ICMP_ECHO,
391 * TIMESTAMP, INFO_REQUEST or ADDRESS type icmp packets from here
392 * on, which all have an ID field [relevant for hashing]. */
393
394 hash = clusterip_hashfn(skb, cipinfo->config);
395
396 switch (ctinfo) {
397 case IP_CT_NEW:
398 ct->mark = hash;
399 break;
400 case IP_CT_RELATED:
401 case IP_CT_RELATED_REPLY:
402 /* FIXME: we don't handle expectations at the moment.
403 * They can arrive on a different node than
404 * the master connection (e.g. FTP passive mode) */
405 case IP_CT_ESTABLISHED:
406 case IP_CT_ESTABLISHED_REPLY:
407 break;
408 default: /* Prevent gcc warnings */
409 break;
410 }
411
412 #ifdef DEBUG
413 nf_ct_dump_tuple_ip(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
414 #endif
415 pr_debug("hash=%u ct_hash=%u ", hash, ct->mark);
416 if (!clusterip_responsible(cipinfo->config, hash)) {
417 pr_debug("not responsible\n");
418 return NF_DROP;
419 }
420 pr_debug("responsible\n");
421
422 /* despite being received via linklayer multicast, this is
423 * actually a unicast IP packet. TCP doesn't like PACKET_MULTICAST */
424 skb->pkt_type = PACKET_HOST;
425
426 return XT_CONTINUE;
427 }
428
429 static int clusterip_tg_check(const struct xt_tgchk_param *par)
430 {
431 struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
432 const struct ipt_entry *e = par->entryinfo;
433 struct clusterip_config *config;
434 int ret;
435
436 if (par->nft_compat) {
437 pr_err("cannot use CLUSTERIP target from nftables compat\n");
438 return -EOPNOTSUPP;
439 }
440
441 if (cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP &&
442 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT &&
443 cipinfo->hash_mode != CLUSTERIP_HASHMODE_SIP_SPT_DPT) {
444 pr_info("unknown mode %u\n", cipinfo->hash_mode);
445 return -EINVAL;
446
447 }
448 if (e->ip.dmsk.s_addr != htonl(0xffffffff) ||
449 e->ip.dst.s_addr == 0) {
450 pr_info("Please specify destination IP\n");
451 return -EINVAL;
452 }
453
454 /* FIXME: further sanity checks */
455
456 config = clusterip_config_find_get(par->net, e->ip.dst.s_addr, 1);
457 if (!config) {
458 if (!(cipinfo->flags & CLUSTERIP_FLAG_NEW)) {
459 pr_info("no config found for %pI4, need 'new'\n",
460 &e->ip.dst.s_addr);
461 return -EINVAL;
462 } else {
463 struct net_device *dev;
464
465 if (e->ip.iniface[0] == '\0') {
466 pr_info("Please specify an interface name\n");
467 return -EINVAL;
468 }
469
470 dev = dev_get_by_name(par->net, e->ip.iniface);
471 if (!dev) {
472 pr_info("no such interface %s\n",
473 e->ip.iniface);
474 return -ENOENT;
475 }
476 dev_put(dev);
477
478 config = clusterip_config_init(par->net, cipinfo,
479 e->ip.dst.s_addr,
480 e->ip.iniface);
481 if (IS_ERR(config))
482 return PTR_ERR(config);
483 }
484 }
485 cipinfo->config = config;
486
487 ret = nf_ct_netns_get(par->net, par->family);
488 if (ret < 0)
489 pr_info("cannot load conntrack support for proto=%u\n",
490 par->family);
491
492 if (!par->net->xt.clusterip_deprecated_warning) {
493 pr_info("ipt_CLUSTERIP is deprecated and it will removed soon, "
494 "use xt_cluster instead\n");
495 par->net->xt.clusterip_deprecated_warning = true;
496 }
497
498 return ret;
499 }
500
501 /* drop reference count of cluster config when rule is deleted */
502 static void clusterip_tg_destroy(const struct xt_tgdtor_param *par)
503 {
504 const struct ipt_clusterip_tgt_info *cipinfo = par->targinfo;
505
506 /* if no more entries are referencing the config, remove it
507 * from the list and destroy the proc entry */
508 clusterip_config_entry_put(par->net, cipinfo->config);
509
510 clusterip_config_put(cipinfo->config);
511
512 nf_ct_netns_put(par->net, par->family);
513 }
514
515 #ifdef CONFIG_COMPAT
516 struct compat_ipt_clusterip_tgt_info
517 {
518 u_int32_t flags;
519 u_int8_t clustermac[6];
520 u_int16_t num_total_nodes;
521 u_int16_t num_local_nodes;
522 u_int16_t local_nodes[CLUSTERIP_MAX_NODES];
523 u_int32_t hash_mode;
524 u_int32_t hash_initval;
525 compat_uptr_t config;
526 };
527 #endif /* CONFIG_COMPAT */
528
529 static struct xt_target clusterip_tg_reg __read_mostly = {
530 .name = "CLUSTERIP",
531 .family = NFPROTO_IPV4,
532 .target = clusterip_tg,
533 .checkentry = clusterip_tg_check,
534 .destroy = clusterip_tg_destroy,
535 .targetsize = sizeof(struct ipt_clusterip_tgt_info),
536 .usersize = offsetof(struct ipt_clusterip_tgt_info, config),
537 #ifdef CONFIG_COMPAT
538 .compatsize = sizeof(struct compat_ipt_clusterip_tgt_info),
539 #endif /* CONFIG_COMPAT */
540 .me = THIS_MODULE
541 };
542
543
544 /***********************************************************************
545 * ARP MANGLING CODE
546 ***********************************************************************/
547
548 /* hardcoded for 48bit ethernet and 32bit ipv4 addresses */
549 struct arp_payload {
550 u_int8_t src_hw[ETH_ALEN];
551 __be32 src_ip;
552 u_int8_t dst_hw[ETH_ALEN];
553 __be32 dst_ip;
554 } __packed;
555
556 #ifdef DEBUG
557 static void arp_print(struct arp_payload *payload)
558 {
559 #define HBUFFERLEN 30
560 char hbuffer[HBUFFERLEN];
561 int j, k;
562
563 for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < ETH_ALEN; j++) {
564 hbuffer[k++] = hex_asc_hi(payload->src_hw[j]);
565 hbuffer[k++] = hex_asc_lo(payload->src_hw[j]);
566 hbuffer[k++] = ':';
567 }
568 hbuffer[--k] = '\0';
569
570 pr_debug("src %pI4@%s, dst %pI4\n",
571 &payload->src_ip, hbuffer, &payload->dst_ip);
572 }
573 #endif
574
575 static unsigned int
576 arp_mangle(void *priv,
577 struct sk_buff *skb,
578 const struct nf_hook_state *state)
579 {
580 struct arphdr *arp = arp_hdr(skb);
581 struct arp_payload *payload;
582 struct clusterip_config *c;
583 struct net *net = state->net;
584
585 /* we don't care about non-ethernet and non-ipv4 ARP */
586 if (arp->ar_hrd != htons(ARPHRD_ETHER) ||
587 arp->ar_pro != htons(ETH_P_IP) ||
588 arp->ar_pln != 4 || arp->ar_hln != ETH_ALEN)
589 return NF_ACCEPT;
590
591 /* we only want to mangle arp requests and replies */
592 if (arp->ar_op != htons(ARPOP_REPLY) &&
593 arp->ar_op != htons(ARPOP_REQUEST))
594 return NF_ACCEPT;
595
596 payload = (void *)(arp+1);
597
598 /* if there is no clusterip configuration for the arp reply's
599 * source ip, we don't want to mangle it */
600 c = clusterip_config_find_get(net, payload->src_ip, 0);
601 if (!c)
602 return NF_ACCEPT;
603
604 /* normally the linux kernel always replies to arp queries of
605 * addresses on different interfacs. However, in the CLUSTERIP case
606 * this wouldn't work, since we didn't subscribe the mcast group on
607 * other interfaces */
608 if (c->ifindex != state->out->ifindex) {
609 pr_debug("not mangling arp reply on different interface: cip'%d'-skb'%d'\n",
610 c->ifindex, state->out->ifindex);
611 clusterip_config_put(c);
612 return NF_ACCEPT;
613 }
614
615 /* mangle reply hardware address */
616 memcpy(payload->src_hw, c->clustermac, arp->ar_hln);
617
618 #ifdef DEBUG
619 pr_debug("mangled arp reply: ");
620 arp_print(payload);
621 #endif
622
623 clusterip_config_put(c);
624
625 return NF_ACCEPT;
626 }
627
628 static const struct nf_hook_ops cip_arp_ops = {
629 .hook = arp_mangle,
630 .pf = NFPROTO_ARP,
631 .hooknum = NF_ARP_OUT,
632 .priority = -1
633 };
634
635 /***********************************************************************
636 * PROC DIR HANDLING
637 ***********************************************************************/
638
639 #ifdef CONFIG_PROC_FS
640
641 struct clusterip_seq_position {
642 unsigned int pos; /* position */
643 unsigned int weight; /* number of bits set == size */
644 unsigned int bit; /* current bit */
645 unsigned long val; /* current value */
646 };
647
648 static void *clusterip_seq_start(struct seq_file *s, loff_t *pos)
649 {
650 struct clusterip_config *c = s->private;
651 unsigned int weight;
652 u_int32_t local_nodes;
653 struct clusterip_seq_position *idx;
654
655 /* FIXME: possible race */
656 local_nodes = c->local_nodes;
657 weight = hweight32(local_nodes);
658 if (*pos >= weight)
659 return NULL;
660
661 idx = kmalloc(sizeof(struct clusterip_seq_position), GFP_KERNEL);
662 if (!idx)
663 return ERR_PTR(-ENOMEM);
664
665 idx->pos = *pos;
666 idx->weight = weight;
667 idx->bit = ffs(local_nodes);
668 idx->val = local_nodes;
669 clear_bit(idx->bit - 1, &idx->val);
670
671 return idx;
672 }
673
674 static void *clusterip_seq_next(struct seq_file *s, void *v, loff_t *pos)
675 {
676 struct clusterip_seq_position *idx = v;
677
678 *pos = ++idx->pos;
679 if (*pos >= idx->weight) {
680 kfree(v);
681 return NULL;
682 }
683 idx->bit = ffs(idx->val);
684 clear_bit(idx->bit - 1, &idx->val);
685 return idx;
686 }
687
688 static void clusterip_seq_stop(struct seq_file *s, void *v)
689 {
690 if (!IS_ERR(v))
691 kfree(v);
692 }
693
694 static int clusterip_seq_show(struct seq_file *s, void *v)
695 {
696 struct clusterip_seq_position *idx = v;
697
698 if (idx->pos != 0)
699 seq_putc(s, ',');
700
701 seq_printf(s, "%u", idx->bit);
702
703 if (idx->pos == idx->weight - 1)
704 seq_putc(s, '\n');
705
706 return 0;
707 }
708
709 static const struct seq_operations clusterip_seq_ops = {
710 .start = clusterip_seq_start,
711 .next = clusterip_seq_next,
712 .stop = clusterip_seq_stop,
713 .show = clusterip_seq_show,
714 };
715
716 static int clusterip_proc_open(struct inode *inode, struct file *file)
717 {
718 int ret = seq_open(file, &clusterip_seq_ops);
719
720 if (!ret) {
721 struct seq_file *sf = file->private_data;
722 struct clusterip_config *c = PDE_DATA(inode);
723
724 sf->private = c;
725
726 clusterip_config_get(c);
727 }
728
729 return ret;
730 }
731
732 static int clusterip_proc_release(struct inode *inode, struct file *file)
733 {
734 struct clusterip_config *c = PDE_DATA(inode);
735 int ret;
736
737 ret = seq_release(inode, file);
738
739 if (!ret)
740 clusterip_config_put(c);
741
742 return ret;
743 }
744
745 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
746 size_t size, loff_t *ofs)
747 {
748 struct clusterip_config *c = PDE_DATA(file_inode(file));
749 #define PROC_WRITELEN 10
750 char buffer[PROC_WRITELEN+1];
751 unsigned long nodenum;
752 int rc;
753
754 if (size > PROC_WRITELEN)
755 return -EIO;
756 if (copy_from_user(buffer, input, size))
757 return -EFAULT;
758 buffer[size] = 0;
759
760 if (*buffer == '+') {
761 rc = kstrtoul(buffer+1, 10, &nodenum);
762 if (rc)
763 return rc;
764 if (clusterip_add_node(c, nodenum))
765 return -ENOMEM;
766 } else if (*buffer == '-') {
767 rc = kstrtoul(buffer+1, 10, &nodenum);
768 if (rc)
769 return rc;
770 if (clusterip_del_node(c, nodenum))
771 return -ENOENT;
772 } else
773 return -EIO;
774
775 return size;
776 }
777
778 static const struct file_operations clusterip_proc_fops = {
779 .owner = THIS_MODULE,
780 .open = clusterip_proc_open,
781 .read = seq_read,
782 .write = clusterip_proc_write,
783 .llseek = seq_lseek,
784 .release = clusterip_proc_release,
785 };
786
787 #endif /* CONFIG_PROC_FS */
788
789 static int clusterip_net_init(struct net *net)
790 {
791 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
792 int ret;
793
794 INIT_LIST_HEAD(&cn->configs);
795
796 spin_lock_init(&cn->lock);
797
798 ret = nf_register_net_hook(net, &cip_arp_ops);
799 if (ret < 0)
800 return ret;
801
802 #ifdef CONFIG_PROC_FS
803 cn->procdir = proc_mkdir("ipt_CLUSTERIP", net->proc_net);
804 if (!cn->procdir) {
805 nf_unregister_net_hook(net, &cip_arp_ops);
806 pr_err("Unable to proc dir entry\n");
807 return -ENOMEM;
808 }
809 #endif /* CONFIG_PROC_FS */
810
811 return 0;
812 }
813
814 static void clusterip_net_exit(struct net *net)
815 {
816 #ifdef CONFIG_PROC_FS
817 struct clusterip_net *cn = net_generic(net, clusterip_net_id);
818 proc_remove(cn->procdir);
819 cn->procdir = NULL;
820 #endif
821 nf_unregister_net_hook(net, &cip_arp_ops);
822 }
823
824 static struct pernet_operations clusterip_net_ops = {
825 .init = clusterip_net_init,
826 .exit = clusterip_net_exit,
827 .id = &clusterip_net_id,
828 .size = sizeof(struct clusterip_net),
829 };
830
831 static int __init clusterip_tg_init(void)
832 {
833 int ret;
834
835 ret = register_pernet_subsys(&clusterip_net_ops);
836 if (ret < 0)
837 return ret;
838
839 ret = xt_register_target(&clusterip_tg_reg);
840 if (ret < 0)
841 goto cleanup_subsys;
842
843 pr_info("ClusterIP Version %s loaded successfully\n",
844 CLUSTERIP_VERSION);
845
846 return 0;
847
848 cleanup_subsys:
849 unregister_pernet_subsys(&clusterip_net_ops);
850 return ret;
851 }
852
853 static void __exit clusterip_tg_exit(void)
854 {
855 pr_info("ClusterIP Version %s unloading\n", CLUSTERIP_VERSION);
856
857 xt_unregister_target(&clusterip_tg_reg);
858 unregister_pernet_subsys(&clusterip_net_ops);
859
860 /* Wait for completion of call_rcu_bh()'s (clusterip_config_rcu_free) */
861 rcu_barrier_bh();
862 }
863
864 module_init(clusterip_tg_init);
865 module_exit(clusterip_tg_exit);
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