1 /* The 'ipset' data structure and related algorithms in this file were
2 inspired by the 'ipaddr.py' library from Cendio Systems AB. */
9 #define DEFAULT_ALLOC 2
10 #define EXTEND_ALLOC_BY 4
12 struct subnet_list
*subnet_list_new(void)
14 struct subnet_list
*r
;
15 r
=safe_malloc(sizeof(*r
),"subnet_list_new:list");
17 r
->alloc
=DEFAULT_ALLOC
;
18 r
->list
=safe_malloc(sizeof(*r
->list
)*r
->alloc
,"subnet_list_new:data");
22 void subnet_list_free(struct subnet_list
*a
)
24 if (a
->list
) free(a
->list
);
28 static void subnet_list_set_len(struct subnet_list
*a
, uint32_t l
)
34 na
=a
->alloc
+EXTEND_ALLOC_BY
;
35 nd
=realloc(a
->list
,sizeof(*nd
)*na
);
37 fatal_perror("subnet_list_set_len: realloc");
45 void subnet_list_append(struct subnet_list
*a
, uint32_t prefix
, uint32_t len
)
48 subnet_list_set_len(a
,a
->entries
+1);
49 sn
=&a
->list
[a
->entries
-1];
52 sn
->mask
=len?
(0xffffffff << (32-len
)):0;
55 struct ipset
*ipset_new(void)
58 r
=safe_malloc(sizeof(*r
),"ipset_new:set");
61 r
->d
=safe_malloc(sizeof(*r
->d
)*r
->a
,"ipset_new:data");
65 void ipset_free(struct ipset
*a
)
72 static void ipset_dump(struct ipset
*a
, string_t name
)
77 for (i
=0; i
<a
->l
; i
++) {
78 printf("[%08x-%08x] ",a
->d
[i
].a
,a
->d
[i
].b
);
84 struct ipset
*ipset_from_subnet(struct subnet s
)
91 r
->d
[0].b
=s
.prefix
| (~s
.mask
);
95 struct ipset
*ipset_from_subnet_list(struct subnet_list
*l
)
97 struct ipset
*r
, *a
, *b
;
101 for (i
=0; i
<l
->entries
; i
++) {
102 a
=ipset_from_subnet(l
->list
[i
]);
111 static void ipset_set_len(struct ipset
*a
, uint32_t l
)
117 na
=a
->a
+EXTEND_ALLOC_BY
;
118 nd
=realloc(a
->d
,sizeof(*nd
)*na
);
120 fatal_perror("ipset_set_len: realloc");
128 static void ipset_append_range(struct ipset
*a
, struct iprange r
)
130 ipset_set_len(a
,a
->l
+1);
134 #define max(a,b) (a>b?a:b)
135 struct ipset
*ipset_union(struct ipset
*a
, struct ipset
*b
)
143 while (ia
<a
->l
|| ib
<b
->l
) {
146 if (a
->d
[ia
].a
< b
->d
[ib
].a
)
156 ipset_append_range(c
,r
);
157 else if (r
.a
<= c
->d
[c
->l
-1].b
+1)
158 /* Extends (or is consumed by) the last range */
159 c
->d
[c
->l
-1].b
=max(c
->d
[c
->l
-1].b
, r
.b
);
161 ipset_append_range(c
,r
);
166 struct ipset
*ipset_intersection(struct ipset
*a
, struct ipset
*b
)
169 struct iprange ra
, rb
;
175 while (ia
<a
->l
&& ib
<b
->l
) {
179 /* The first entry of a doesn't overlap with any part of b */
181 else if (ra
.a
> rb
.b
)
182 /* The first entry of b doesn't overlap with any part of a */
185 /* Trim away any leading edges */
187 /* a starts before b */
189 else if (ra
.a
> rb
.a
)
190 /* b starts before a */
193 /* Now the ranges start at the same point */
195 /* The ranges are equal */
196 ipset_append_range(r
,ra
);
199 } else if (ra
.b
< rb
.b
) {
200 /* a is the smaller range */
201 ipset_append_range(r
,ra
);
204 /* y is the smaller range */
205 ipset_append_range(r
,rb
);
213 struct ipset
*ipset_complement(struct ipset
*a
)
222 for (i
=0; i
<a
->l
; i
++) {
228 ipset_append_range(r
,n
);
232 if (pre
!=0xffffffff) {
235 ipset_append_range(r
,n
);
241 struct ipset
*ipset_subtract(struct ipset
*a
, struct ipset
*b
)
244 c
=ipset_complement(b
);
245 r
=ipset_intersection(a
,c
);
250 bool_t
ipset_is_empty(struct ipset
*a
)
255 bool_t
ipset_contains_addr(struct ipset
*a
, uint32_t addr
)
260 for (i
=0; i
<a
->l
; i
++) {
262 if (addr
>=r
.a
&& addr
<=r
.b
) return True
;
263 if (addr
<r
.a
) return False
;
268 /* sub is a subset of super if it does not intersect with the complement
270 bool_t
ipset_is_subset(struct ipset
*super
, struct ipset
*sub
)
272 struct ipset
*superc
;
276 superc
=ipset_complement(super
);
277 inter
=ipset_intersection(superc
,sub
);
278 empty
=ipset_is_empty(inter
);
284 struct subnet_list
*ipset_to_subnet_list(struct ipset
*is
)
286 struct subnet_list
*r
;
287 int64_t a
,b
,lobit
,himask
,lomask
;
292 for (i
=0; i
<is
->l
; i
++) {
301 if ((a
& lomask
) != 0) {
302 subnet_list_append(r
,a
,bits
);
304 } else if ((b
& lomask
) != lomask
) {
305 subnet_list_append(r
,b
&himask
,bits
);
308 lomask
= (lomask
<< 1) | 1;
309 lobit
= (lobit
<< 1);
310 himask
= himask
^ lobit
;
320 /* The string buffer must be at least 16 bytes long */
321 string_t
ipaddr_to_string(uint32_t addr
)
326 s
=safe_malloc(16,"ipaddr_to_string");
331 snprintf(s
, 16, "%d.%d.%d.%d", a
, b
, c
, d
);
335 string_t
subnet_to_string(struct subnet sn
)
337 uint32_t addr
=sn
.prefix
;
341 s
=safe_malloc(19,"subnet_to_string");
346 snprintf(s
, 19, "%d.%d.%d.%d/%d", a
, b
, c
, d
, sn
.len
);
350 static struct subnet
string_item_to_subnet(item_t
*i
, cstring_t desc
,
354 uint32_t a
, b
, c
, d
, n
;
360 /* i is not guaranteed to be a string */
361 if (i
->type
!=t_string
) {
362 cfgfatal(i
->loc
,desc
,"expecting a string (subnet specification)\n");
366 if (strcmp(in
,"default")==0) {
377 /* We expect strings of the form "a.b.c.d[/n]", i.e. the dots are
378 NOT optional. The subnet mask is optional; if missing it is assumed
380 match
=sscanf(in
,"%u.%u.%u.%u/%u", &a
, &b
, &c
, &d
, &n
);
382 cfgfatal(i
->loc
,desc
,"\"%s\" is not a valid "
383 "subnet specification\n",in
);
388 if (a
>255 || b
>255 || c
>255 || d
>255 || n
>32) {
389 cfgfatal(i
->loc
,desc
,"\"%s\": range error\n",in
);
391 s
.prefix
=(a
<<24)|(b
<<16)|(c
<<8)|(d
);
392 s
.mask
=n?
(~0UL << (32-n
)):0;
394 if (s
.prefix
& ~s
.mask
) {
395 cfgfatal(i
->loc
,desc
,"\"%s\": prefix not fully contained "
401 uint32_t string_item_to_ipaddr(item_t
*i
, cstring_t desc
)
406 /* i is not guaranteed to be a string */
407 if (i
->type
!=t_string
) {
408 cfgfatal(i
->loc
,desc
,"expecting a string (IP address)\n");
411 match
=sscanf(i
->data
.string
,"%u.%u.%u.%u", &a
, &b
, &c
, &d
);
413 cfgfatal(i
->loc
,desc
,"\"%s\" is not a valid "
414 "IP address\n",i
->data
.string
);
416 if (a
>255 || b
>255 || c
>255 || d
>255) {
417 cfgfatal(i
->loc
,desc
,"\"%s\": range error\n",i
->data
.string
);
419 return (a
<<24)|(b
<<16)|(c
<<8)|(d
);
422 struct ipset
*string_list_to_ipset(list_t
*l
, struct cloc loc
,
423 cstring_t module
, cstring_t param
)
425 struct ipset
*r
, *n
, *isn
;
432 for (i
=0; i
<e
; i
++) {
434 isn
=ipset_from_subnet(string_item_to_subnet(item
,param
,&inv
));
436 n
=ipset_subtract(r
,isn
);
438 n
=ipset_union(r
,isn
);