1/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 as
5 * published by the Free Software Foundation.
6 */
7
8/* Kernel module implementing an IP set type: the hash:ip,port,ip type */
9
10#include <linux/jhash.h>
11#include <linux/module.h>
12#include <linux/ip.h>
13#include <linux/skbuff.h>
14#include <linux/errno.h>
15#include <linux/random.h>
16#include <net/ip.h>
17#include <net/ipv6.h>
18#include <net/netlink.h>
19#include <net/tcp.h>
20
21#include <linux/netfilter.h>
22#include <linux/netfilter/ipset/pfxlen.h>
23#include <linux/netfilter/ipset/ip_set.h>
24#include <linux/netfilter/ipset/ip_set_getport.h>
25#include <linux/netfilter/ipset/ip_set_hash.h>
26
27#define REVISION_MIN	0
28/*			1    SCTP and UDPLITE support added */
29#define REVISION_MAX	2 /* Counters support added */
30
31MODULE_LICENSE("GPL");
32MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
33IP_SET_MODULE_DESC("hash:ip,port,ip", REVISION_MIN, REVISION_MAX);
34MODULE_ALIAS("ip_set_hash:ip,port,ip");
35
36/* Type specific function prefix */
37#define HTYPE		hash_ipportip
38
39/* IPv4 variants */
40
41/* Member elements  */
42struct hash_ipportip4_elem {
43	__be32 ip;
44	__be32 ip2;
45	__be16 port;
46	u8 proto;
47	u8 padding;
48};
49
50struct hash_ipportip4t_elem {
51	__be32 ip;
52	__be32 ip2;
53	__be16 port;
54	u8 proto;
55	u8 padding;
56	unsigned long timeout;
57};
58
59struct hash_ipportip4c_elem {
60	__be32 ip;
61	__be32 ip2;
62	__be16 port;
63	u8 proto;
64	u8 padding;
65	struct ip_set_counter counter;
66};
67
68struct hash_ipportip4ct_elem {
69	__be32 ip;
70	__be32 ip2;
71	__be16 port;
72	u8 proto;
73	u8 padding;
74	struct ip_set_counter counter;
75	unsigned long timeout;
76};
77
78static inline bool
79hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
80			  const struct hash_ipportip4_elem *ip2,
81			  u32 *multi)
82{
83	return ip1->ip == ip2->ip &&
84	       ip1->ip2 == ip2->ip2 &&
85	       ip1->port == ip2->port &&
86	       ip1->proto == ip2->proto;
87}
88
89static bool
90hash_ipportip4_data_list(struct sk_buff *skb,
91		       const struct hash_ipportip4_elem *data)
92{
93	if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
94	    nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
95	    nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
96	    nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
97		goto nla_put_failure;
98	return 0;
99
100nla_put_failure:
101	return 1;
102}
103
104static inline void
105hash_ipportip4_data_next(struct hash_ipportip4_elem *next,
106			 const struct hash_ipportip4_elem *d)
107{
108	next->ip = d->ip;
109	next->port = d->port;
110}
111
112/* Common functions */
113#define MTYPE		hash_ipportip4
114#define PF		4
115#define HOST_MASK	32
116#include "ip_set_hash_gen.h"
117
118static int
119hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
120		    const struct xt_action_param *par,
121		    enum ipset_adt adt, struct ip_set_adt_opt *opt)
122{
123	const struct hash_ipportip *h = set->data;
124	ipset_adtfn adtfn = set->variant->adt[adt];
125	struct hash_ipportip4_elem e = { };
126	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
127
128	if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
129				 &e.port, &e.proto))
130		return -EINVAL;
131
132	ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
133	ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
134	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
135}
136
137static int
138hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
139		    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
140{
141	const struct hash_ipportip *h = set->data;
142	ipset_adtfn adtfn = set->variant->adt[adt];
143	struct hash_ipportip4_elem e = { };
144	struct ip_set_ext ext = IP_SET_INIT_UEXT(h);
145	u32 ip, ip_to, p = 0, port, port_to;
146	bool with_ports = false;
147	int ret;
148
149	if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
150		     !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
151		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
152		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
153		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
154		     !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
155		return -IPSET_ERR_PROTOCOL;
156
157	if (tb[IPSET_ATTR_LINENO])
158		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
159
160	ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
161	      ip_set_get_extensions(set, tb, &ext);
162	if (ret)
163		return ret;
164
165	ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &e.ip2);
166	if (ret)
167		return ret;
168
169	if (tb[IPSET_ATTR_PORT])
170		e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
171	else
172		return -IPSET_ERR_PROTOCOL;
173
174	if (tb[IPSET_ATTR_PROTO]) {
175		e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
176		with_ports = ip_set_proto_with_ports(e.proto);
177
178		if (e.proto == 0)
179			return -IPSET_ERR_INVALID_PROTO;
180	} else
181		return -IPSET_ERR_MISSING_PROTO;
182
183	if (!(with_ports || e.proto == IPPROTO_ICMP))
184		e.port = 0;
185
186	if (adt == IPSET_TEST ||
187	    !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
188	      tb[IPSET_ATTR_PORT_TO])) {
189		ret = adtfn(set, &e, &ext, &ext, flags);
190		return ip_set_eexist(ret, flags) ? 0 : ret;
191	}
192
193	ip_to = ip = ntohl(e.ip);
194	if (tb[IPSET_ATTR_IP_TO]) {
195		ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
196		if (ret)
197			return ret;
198		if (ip > ip_to)
199			swap(ip, ip_to);
200	} else if (tb[IPSET_ATTR_CIDR]) {
201		u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
202
203		if (!cidr || cidr > 32)
204			return -IPSET_ERR_INVALID_CIDR;
205		ip_set_mask_from_to(ip, ip_to, cidr);
206	}
207
208	port_to = port = ntohs(e.port);
209	if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
210		port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
211		if (port > port_to)
212			swap(port, port_to);
213	}
214
215	if (retried)
216		ip = ntohl(h->next.ip);
217	for (; !before(ip_to, ip); ip++) {
218		p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
219						       : port;
220		for (; p <= port_to; p++) {
221			e.ip = htonl(ip);
222			e.port = htons(p);
223			ret = adtfn(set, &e, &ext, &ext, flags);
224
225			if (ret && !ip_set_eexist(ret, flags))
226				return ret;
227			else
228				ret = 0;
229		}
230	}
231	return ret;
232}
233
234/* IPv6 variants */
235
236struct hash_ipportip6_elem {
237	union nf_inet_addr ip;
238	union nf_inet_addr ip2;
239	__be16 port;
240	u8 proto;
241	u8 padding;
242};
243
244struct hash_ipportip6t_elem {
245	union nf_inet_addr ip;
246	union nf_inet_addr ip2;
247	__be16 port;
248	u8 proto;
249	u8 padding;
250	unsigned long timeout;
251};
252
253struct hash_ipportip6c_elem {
254	union nf_inet_addr ip;
255	union nf_inet_addr ip2;
256	__be16 port;
257	u8 proto;
258	u8 padding;
259	struct ip_set_counter counter;
260};
261
262struct hash_ipportip6ct_elem {
263	union nf_inet_addr ip;
264	union nf_inet_addr ip2;
265	__be16 port;
266	u8 proto;
267	u8 padding;
268	struct ip_set_counter counter;
269	unsigned long timeout;
270};
271
272/* Common functions */
273
274static inline bool
275hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
276			  const struct hash_ipportip6_elem *ip2,
277			  u32 *multi)
278{
279	return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
280	       ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
281	       ip1->port == ip2->port &&
282	       ip1->proto == ip2->proto;
283}
284
285static bool
286hash_ipportip6_data_list(struct sk_buff *skb,
287			 const struct hash_ipportip6_elem *data)
288{
289	if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
290	    nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
291	    nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
292	    nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
293		goto nla_put_failure;
294	return 0;
295
296nla_put_failure:
297	return 1;
298}
299
300static inline void
301hash_ipportip6_data_next(struct hash_ipportip4_elem *next,
302			 const struct hash_ipportip6_elem *d)
303{
304	next->port = d->port;
305}
306
307#undef MTYPE
308#undef PF
309#undef HOST_MASK
310
311#define MTYPE		hash_ipportip6
312#define PF		6
313#define HOST_MASK	128
314#define IP_SET_EMIT_CREATE
315#include "ip_set_hash_gen.h"
316
317static int
318hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
319		    const struct xt_action_param *par,
320		    enum ipset_adt adt, struct ip_set_adt_opt *opt)
321{
322	const struct hash_ipportip *h = set->data;
323	ipset_adtfn adtfn = set->variant->adt[adt];
324	struct hash_ipportip6_elem e = { };
325	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
326
327	if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
328				 &e.port, &e.proto))
329		return -EINVAL;
330
331	ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
332	ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
333	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
334}
335
336static int
337hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
338		    enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
339{
340	const struct hash_ipportip *h = set->data;
341	ipset_adtfn adtfn = set->variant->adt[adt];
342	struct hash_ipportip6_elem e = { };
343	struct ip_set_ext ext = IP_SET_INIT_UEXT(h);
344	u32 port, port_to;
345	bool with_ports = false;
346	int ret;
347
348	if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
349		     !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
350		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
351		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
352		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
353		     !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
354		     tb[IPSET_ATTR_IP_TO] ||
355		     tb[IPSET_ATTR_CIDR]))
356		return -IPSET_ERR_PROTOCOL;
357
358	if (tb[IPSET_ATTR_LINENO])
359		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
360
361	ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
362	      ip_set_get_extensions(set, tb, &ext);
363	if (ret)
364		return ret;
365
366	ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
367	if (ret)
368		return ret;
369
370	if (tb[IPSET_ATTR_PORT])
371		e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
372	else
373		return -IPSET_ERR_PROTOCOL;
374
375	if (tb[IPSET_ATTR_PROTO]) {
376		e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
377		with_ports = ip_set_proto_with_ports(e.proto);
378
379		if (e.proto == 0)
380			return -IPSET_ERR_INVALID_PROTO;
381	} else
382		return -IPSET_ERR_MISSING_PROTO;
383
384	if (!(with_ports || e.proto == IPPROTO_ICMPV6))
385		e.port = 0;
386
387	if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
388		ret = adtfn(set, &e, &ext, &ext, flags);
389		return ip_set_eexist(ret, flags) ? 0 : ret;
390	}
391
392	port = ntohs(e.port);
393	port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
394	if (port > port_to)
395		swap(port, port_to);
396
397	if (retried)
398		port = ntohs(h->next.port);
399	for (; port <= port_to; port++) {
400		e.port = htons(port);
401		ret = adtfn(set, &e, &ext, &ext, flags);
402
403		if (ret && !ip_set_eexist(ret, flags))
404			return ret;
405		else
406			ret = 0;
407	}
408	return ret;
409}
410
411static struct ip_set_type hash_ipportip_type __read_mostly = {
412	.name		= "hash:ip,port,ip",
413	.protocol	= IPSET_PROTOCOL,
414	.features	= IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
415	.dimension	= IPSET_DIM_THREE,
416	.family		= NFPROTO_UNSPEC,
417	.revision_min	= REVISION_MIN,
418	.revision_max	= REVISION_MAX,
419	.create		= hash_ipportip_create,
420	.create_policy	= {
421		[IPSET_ATTR_HASHSIZE]	= { .type = NLA_U32 },
422		[IPSET_ATTR_MAXELEM]	= { .type = NLA_U32 },
423		[IPSET_ATTR_PROBES]	= { .type = NLA_U8 },
424		[IPSET_ATTR_RESIZE]	= { .type = NLA_U8  },
425		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
426		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
427	},
428	.adt_policy	= {
429		[IPSET_ATTR_IP]		= { .type = NLA_NESTED },
430		[IPSET_ATTR_IP_TO]	= { .type = NLA_NESTED },
431		[IPSET_ATTR_IP2]	= { .type = NLA_NESTED },
432		[IPSET_ATTR_PORT]	= { .type = NLA_U16 },
433		[IPSET_ATTR_PORT_TO]	= { .type = NLA_U16 },
434		[IPSET_ATTR_CIDR]	= { .type = NLA_U8 },
435		[IPSET_ATTR_PROTO]	= { .type = NLA_U8 },
436		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
437		[IPSET_ATTR_LINENO]	= { .type = NLA_U32 },
438		[IPSET_ATTR_BYTES]	= { .type = NLA_U64 },
439		[IPSET_ATTR_PACKETS]	= { .type = NLA_U64 },
440	},
441	.me		= THIS_MODULE,
442};
443
444static int __init
445hash_ipportip_init(void)
446{
447	return ip_set_type_register(&hash_ipportip_type);
448}
449
450static void __exit
451hash_ipportip_fini(void)
452{
453	ip_set_type_unregister(&hash_ipportip_type);
454}
455
456module_init(hash_ipportip_init);
457module_exit(hash_ipportip_fini);
458