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/net/netfilter/ipset/ip_set_bitmap_port.c

http://github.com/mirrors/linux
C | 332 lines | 270 code | 52 blank | 10 comment | 31 complexity | e0c693cc4f0c1e050210196cf02bfa28 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
  3
  4/* Kernel module implementing an IP set type: the bitmap:port type */
  5
  6#include <linux/module.h>
  7#include <linux/ip.h>
  8#include <linux/skbuff.h>
  9#include <linux/errno.h>
 10#include <linux/netlink.h>
 11#include <linux/jiffies.h>
 12#include <linux/timer.h>
 13#include <net/netlink.h>
 14
 15#include <linux/netfilter/ipset/ip_set.h>
 16#include <linux/netfilter/ipset/ip_set_bitmap.h>
 17#include <linux/netfilter/ipset/ip_set_getport.h>
 18
 19#define IPSET_TYPE_REV_MIN	0
 20/*				1	   Counter support added */
 21/*				2	   Comment support added */
 22#define IPSET_TYPE_REV_MAX	3	/* skbinfo support added */
 23
 24MODULE_LICENSE("GPL");
 25MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
 26IP_SET_MODULE_DESC("bitmap:port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 27MODULE_ALIAS("ip_set_bitmap:port");
 28
 29#define MTYPE		bitmap_port
 30
 31/* Type structure */
 32struct bitmap_port {
 33	unsigned long *members;	/* the set members */
 34	u16 first_port;		/* host byte order, included in range */
 35	u16 last_port;		/* host byte order, included in range */
 36	u32 elements;		/* number of max elements in the set */
 37	size_t memsize;		/* members size */
 38	struct timer_list gc;	/* garbage collection */
 39	struct ip_set *set;	/* attached to this ip_set */
 40	unsigned char extensions[]	/* data extensions */
 41		__aligned(__alignof__(u64));
 42};
 43
 44/* ADT structure for generic function args */
 45struct bitmap_port_adt_elem {
 46	u16 id;
 47};
 48
 49static u16
 50port_to_id(const struct bitmap_port *m, u16 port)
 51{
 52	return port - m->first_port;
 53}
 54
 55/* Common functions */
 56
 57static int
 58bitmap_port_do_test(const struct bitmap_port_adt_elem *e,
 59		    const struct bitmap_port *map, size_t dsize)
 60{
 61	return !!test_bit(e->id, map->members);
 62}
 63
 64static int
 65bitmap_port_gc_test(u16 id, const struct bitmap_port *map, size_t dsize)
 66{
 67	return !!test_bit(id, map->members);
 68}
 69
 70static int
 71bitmap_port_do_add(const struct bitmap_port_adt_elem *e,
 72		   struct bitmap_port *map, u32 flags, size_t dsize)
 73{
 74	return !!test_bit(e->id, map->members);
 75}
 76
 77static int
 78bitmap_port_do_del(const struct bitmap_port_adt_elem *e,
 79		   struct bitmap_port *map)
 80{
 81	return !test_and_clear_bit(e->id, map->members);
 82}
 83
 84static int
 85bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id,
 86		    size_t dsize)
 87{
 88	return nla_put_net16(skb, IPSET_ATTR_PORT,
 89			     htons(map->first_port + id));
 90}
 91
 92static int
 93bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
 94{
 95	return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
 96	       nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
 97}
 98
 99static bool
100ip_set_get_ip_port(const struct sk_buff *skb, u8 pf, bool src, __be16 *port)
101{
102	bool ret;
103	u8 proto;
104
105	switch (pf) {
106	case NFPROTO_IPV4:
107		ret = ip_set_get_ip4_port(skb, src, port, &proto);
108		break;
109	case NFPROTO_IPV6:
110		ret = ip_set_get_ip6_port(skb, src, port, &proto);
111		break;
112	default:
113		return false;
114	}
115	if (!ret)
116		return ret;
117	switch (proto) {
118	case IPPROTO_TCP:
119	case IPPROTO_UDP:
120		return true;
121	default:
122		return false;
123	}
124}
125
126static int
127bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
128		 const struct xt_action_param *par,
129		 enum ipset_adt adt, struct ip_set_adt_opt *opt)
130{
131	struct bitmap_port *map = set->data;
132	ipset_adtfn adtfn = set->variant->adt[adt];
133	struct bitmap_port_adt_elem e = { .id = 0 };
134	struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
135	__be16 __port;
136	u16 port = 0;
137
138	if (!ip_set_get_ip_port(skb, opt->family,
139				opt->flags & IPSET_DIM_ONE_SRC, &__port))
140		return -EINVAL;
141
142	port = ntohs(__port);
143
144	if (port < map->first_port || port > map->last_port)
145		return -IPSET_ERR_BITMAP_RANGE;
146
147	e.id = port_to_id(map, port);
148
149	return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
150}
151
152static int
153bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
154		 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
155{
156	struct bitmap_port *map = set->data;
157	ipset_adtfn adtfn = set->variant->adt[adt];
158	struct bitmap_port_adt_elem e = { .id = 0 };
159	struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
160	u32 port;	/* wraparound */
161	u16 port_to;
162	int ret = 0;
163
164	if (tb[IPSET_ATTR_LINENO])
165		*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
166
167	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
168		     !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
169		return -IPSET_ERR_PROTOCOL;
170
171	port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
172	if (port < map->first_port || port > map->last_port)
173		return -IPSET_ERR_BITMAP_RANGE;
174	ret = ip_set_get_extensions(set, tb, &ext);
175	if (ret)
176		return ret;
177
178	if (adt == IPSET_TEST) {
179		e.id = port_to_id(map, port);
180		return adtfn(set, &e, &ext, &ext, flags);
181	}
182
183	if (tb[IPSET_ATTR_PORT_TO]) {
184		port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
185		if (port > port_to) {
186			swap(port, port_to);
187			if (port < map->first_port)
188				return -IPSET_ERR_BITMAP_RANGE;
189		}
190	} else {
191		port_to = port;
192	}
193
194	if (port_to > map->last_port)
195		return -IPSET_ERR_BITMAP_RANGE;
196
197	for (; port <= port_to; port++) {
198		e.id = port_to_id(map, port);
199		ret = adtfn(set, &e, &ext, &ext, flags);
200
201		if (ret && !ip_set_eexist(ret, flags))
202			return ret;
203
204		ret = 0;
205	}
206	return ret;
207}
208
209static bool
210bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b)
211{
212	const struct bitmap_port *x = a->data;
213	const struct bitmap_port *y = b->data;
214
215	return x->first_port == y->first_port &&
216	       x->last_port == y->last_port &&
217	       a->timeout == b->timeout &&
218	       a->extensions == b->extensions;
219}
220
221/* Plain variant */
222
223struct bitmap_port_elem {
224};
225
226#include "ip_set_bitmap_gen.h"
227
228/* Create bitmap:ip type of sets */
229
230static bool
231init_map_port(struct ip_set *set, struct bitmap_port *map,
232	      u16 first_port, u16 last_port)
233{
234	map->members = bitmap_zalloc(map->elements, GFP_KERNEL | __GFP_NOWARN);
235	if (!map->members)
236		return false;
237	map->first_port = first_port;
238	map->last_port = last_port;
239	set->timeout = IPSET_NO_TIMEOUT;
240
241	map->set = set;
242	set->data = map;
243	set->family = NFPROTO_UNSPEC;
244
245	return true;
246}
247
248static int
249bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
250		   u32 flags)
251{
252	struct bitmap_port *map;
253	u16 first_port, last_port;
254	u32 elements;
255
256	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
257		     !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
258		     !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
259		     !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
260		return -IPSET_ERR_PROTOCOL;
261
262	first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
263	last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
264	if (first_port > last_port)
265		swap(first_port, last_port);
266
267	elements = last_port - first_port + 1;
268	set->dsize = ip_set_elem_len(set, tb, 0, 0);
269	map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
270	if (!map)
271		return -ENOMEM;
272
273	map->elements = elements;
274	map->memsize = BITS_TO_LONGS(elements) * sizeof(unsigned long);
275	set->variant = &bitmap_port;
276	if (!init_map_port(set, map, first_port, last_port)) {
277		kfree(map);
278		return -ENOMEM;
279	}
280	if (tb[IPSET_ATTR_TIMEOUT]) {
281		set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
282		bitmap_port_gc_init(set, bitmap_port_gc);
283	}
284	return 0;
285}
286
287static struct ip_set_type bitmap_port_type = {
288	.name		= "bitmap:port",
289	.protocol	= IPSET_PROTOCOL,
290	.features	= IPSET_TYPE_PORT,
291	.dimension	= IPSET_DIM_ONE,
292	.family		= NFPROTO_UNSPEC,
293	.revision_min	= IPSET_TYPE_REV_MIN,
294	.revision_max	= IPSET_TYPE_REV_MAX,
295	.create		= bitmap_port_create,
296	.create_policy	= {
297		[IPSET_ATTR_PORT]	= { .type = NLA_U16 },
298		[IPSET_ATTR_PORT_TO]	= { .type = NLA_U16 },
299		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
300		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
301	},
302	.adt_policy	= {
303		[IPSET_ATTR_PORT]	= { .type = NLA_U16 },
304		[IPSET_ATTR_PORT_TO]	= { .type = NLA_U16 },
305		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
306		[IPSET_ATTR_LINENO]	= { .type = NLA_U32 },
307		[IPSET_ATTR_BYTES]	= { .type = NLA_U64 },
308		[IPSET_ATTR_PACKETS]	= { .type = NLA_U64 },
309		[IPSET_ATTR_COMMENT]	= { .type = NLA_NUL_STRING,
310					    .len  = IPSET_MAX_COMMENT_SIZE },
311		[IPSET_ATTR_SKBMARK]	= { .type = NLA_U64 },
312		[IPSET_ATTR_SKBPRIO]	= { .type = NLA_U32 },
313		[IPSET_ATTR_SKBQUEUE]	= { .type = NLA_U16 },
314	},
315	.me		= THIS_MODULE,
316};
317
318static int __init
319bitmap_port_init(void)
320{
321	return ip_set_type_register(&bitmap_port_type);
322}
323
324static void __exit
325bitmap_port_fini(void)
326{
327	rcu_barrier();
328	ip_set_type_unregister(&bitmap_port_type);
329}
330
331module_init(bitmap_port_init);
332module_exit(bitmap_port_fini);