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