1
2
3
4
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
21
22#define IPSET_TYPE_REV_MAX 3
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
32struct bitmap_port {
33 unsigned long *members;
34 u16 first_port;
35 u16 last_port;
36 u32 elements;
37 size_t memsize;
38 struct timer_list gc;
39 struct ip_set *set;
40 unsigned char extensions[]
41 __aligned(__alignof__(u64));
42};
43
44
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
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;
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
222
223struct bitmap_port_elem {
224};
225
226#include "ip_set_bitmap_gen.h"
227
228
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 ip_set_free(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);
333
