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 hash:net,port type */
5
6 #include <linux/jhash.h>
7 #include <linux/module.h>
8 #include <linux/ip.h>
9 #include <linux/skbuff.h>
10 #include <linux/errno.h>
11 #include <linux/random.h>
12 #include <net/ip.h>
13 #include <net/ipv6.h>
14 #include <net/netlink.h>
15
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/ipset/pfxlen.h>
18 #include <linux/netfilter/ipset/ip_set.h>
19 #include <linux/netfilter/ipset/ip_set_getport.h>
20 #include <linux/netfilter/ipset/ip_set_hash.h>
21
22 #define IPSET_TYPE_REV_MIN 0
23 /* 1 SCTP and UDPLITE support added */
24 /* 2 Range as input support for IPv4 added */
25 /* 3 nomatch flag support added */
26 /* 4 Counters support added */
27 /* 5 Comments support added */
28 /* 6 Forceadd support added */
29 /* 7 skbinfo support added */
30 #define IPSET_TYPE_REV_MAX 8 /* bucketsize, initval support added */
31
32 MODULE_LICENSE("GPL");
33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
34 IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
35 MODULE_ALIAS("ip_set_hash:net,port");
36
37 /* Type specific function prefix */
38 #define HTYPE hash_netport
39 #define IP_SET_HASH_WITH_PROTO
40 #define IP_SET_HASH_WITH_NETS
41
42 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
43 * However this way we have to store internally cidr - 1,
44 * dancing back and forth.
45 */
46 #define IP_SET_HASH_WITH_NETS_PACKED
47
48 /* IPv4 variant */
49
50 /* Member elements */
51 struct hash_netport4_elem {
52 __be32 ip;
53 __be16 port;
54 u8 proto;
55 u8 cidr:7;
56 u8 nomatch:1;
57 };
58
59 /* Common functions */
60
61 static bool
hash_netport4_data_equal(const struct hash_netport4_elem * ip1,const struct hash_netport4_elem * ip2,u32 * multi)62 hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
63 const struct hash_netport4_elem *ip2,
64 u32 *multi)
65 {
66 return ip1->ip == ip2->ip &&
67 ip1->port == ip2->port &&
68 ip1->proto == ip2->proto &&
69 ip1->cidr == ip2->cidr;
70 }
71
72 static int
hash_netport4_do_data_match(const struct hash_netport4_elem * elem)73 hash_netport4_do_data_match(const struct hash_netport4_elem *elem)
74 {
75 return elem->nomatch ? -ENOTEMPTY : 1;
76 }
77
78 static void
hash_netport4_data_set_flags(struct hash_netport4_elem * elem,u32 flags)79 hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags)
80 {
81 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
82 }
83
84 static void
hash_netport4_data_reset_flags(struct hash_netport4_elem * elem,u8 * flags)85 hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags)
86 {
87 swap(*flags, elem->nomatch);
88 }
89
90 static void
hash_netport4_data_netmask(struct hash_netport4_elem * elem,u8 cidr)91 hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr)
92 {
93 elem->ip &= ip_set_netmask(cidr);
94 elem->cidr = cidr - 1;
95 }
96
97 static bool
hash_netport4_data_list(struct sk_buff * skb,const struct hash_netport4_elem * data)98 hash_netport4_data_list(struct sk_buff *skb,
99 const struct hash_netport4_elem *data)
100 {
101 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
102
103 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
104 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
105 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
106 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
107 (flags &&
108 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
109 goto nla_put_failure;
110 return false;
111
112 nla_put_failure:
113 return true;
114 }
115
116 static void
hash_netport4_data_next(struct hash_netport4_elem * next,const struct hash_netport4_elem * d)117 hash_netport4_data_next(struct hash_netport4_elem *next,
118 const struct hash_netport4_elem *d)
119 {
120 next->ip = d->ip;
121 next->port = d->port;
122 }
123
124 #define MTYPE hash_netport4
125 #define HOST_MASK 32
126 #include "ip_set_hash_gen.h"
127
128 static int
hash_netport4_kadt(struct ip_set * set,const struct sk_buff * skb,const struct xt_action_param * par,enum ipset_adt adt,struct ip_set_adt_opt * opt)129 hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
130 const struct xt_action_param *par,
131 enum ipset_adt adt, struct ip_set_adt_opt *opt)
132 {
133 const struct hash_netport4 *h = set->data;
134 ipset_adtfn adtfn = set->variant->adt[adt];
135 struct hash_netport4_elem e = {
136 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
137 };
138 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
139
140 if (adt == IPSET_TEST)
141 e.cidr = HOST_MASK - 1;
142
143 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
144 &e.port, &e.proto))
145 return -EINVAL;
146
147 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
148 e.ip &= ip_set_netmask(e.cidr + 1);
149
150 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
151 }
152
153 static int
hash_netport4_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)154 hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
155 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
156 {
157 struct hash_netport4 *h = set->data;
158 ipset_adtfn adtfn = set->variant->adt[adt];
159 struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 };
160 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
161 u32 port, port_to, p = 0, ip = 0, ip_to = 0, i = 0;
162 bool with_ports = false;
163 u8 cidr;
164 int ret;
165
166 if (tb[IPSET_ATTR_LINENO])
167 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
168
169 if (unlikely(!tb[IPSET_ATTR_IP] ||
170 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
171 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
172 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
173 return -IPSET_ERR_PROTOCOL;
174
175 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
176 if (ret)
177 return ret;
178
179 ret = ip_set_get_extensions(set, tb, &ext);
180 if (ret)
181 return ret;
182
183 if (tb[IPSET_ATTR_CIDR]) {
184 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
185 if (!cidr || cidr > HOST_MASK)
186 return -IPSET_ERR_INVALID_CIDR;
187 e.cidr = cidr - 1;
188 }
189
190 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
191
192 if (tb[IPSET_ATTR_PROTO]) {
193 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
194 with_ports = ip_set_proto_with_ports(e.proto);
195
196 if (e.proto == 0)
197 return -IPSET_ERR_INVALID_PROTO;
198 } else {
199 return -IPSET_ERR_MISSING_PROTO;
200 }
201
202 if (!(with_ports || e.proto == IPPROTO_ICMP))
203 e.port = 0;
204
205 with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
206
207 if (tb[IPSET_ATTR_CADT_FLAGS]) {
208 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
209
210 if (cadt_flags & IPSET_FLAG_NOMATCH)
211 flags |= (IPSET_FLAG_NOMATCH << 16);
212 }
213
214 if (adt == IPSET_TEST || !(with_ports || tb[IPSET_ATTR_IP_TO])) {
215 e.ip = htonl(ip & ip_set_hostmask(e.cidr + 1));
216 ret = adtfn(set, &e, &ext, &ext, flags);
217 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
218 ip_set_eexist(ret, flags) ? 0 : ret;
219 }
220
221 port = port_to = ntohs(e.port);
222 if (tb[IPSET_ATTR_PORT_TO]) {
223 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
224 if (port_to < port)
225 swap(port, port_to);
226 }
227 if (tb[IPSET_ATTR_IP_TO]) {
228 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
229 if (ret)
230 return ret;
231 if (ip_to < ip)
232 swap(ip, ip_to);
233 if (ip + UINT_MAX == ip_to)
234 return -IPSET_ERR_HASH_RANGE;
235 } else {
236 ip_set_mask_from_to(ip, ip_to, e.cidr + 1);
237 }
238
239 if (retried) {
240 ip = ntohl(h->next.ip);
241 p = ntohs(h->next.port);
242 } else {
243 p = port;
244 }
245 do {
246 e.ip = htonl(ip);
247 ip = ip_set_range_to_cidr(ip, ip_to, &cidr);
248 e.cidr = cidr - 1;
249 for (; p <= port_to; p++, i++) {
250 e.port = htons(p);
251 if (i > IPSET_MAX_RANGE) {
252 hash_netport4_data_next(&h->next, &e);
253 return -ERANGE;
254 }
255 ret = adtfn(set, &e, &ext, &ext, flags);
256 if (ret && !ip_set_eexist(ret, flags))
257 return ret;
258
259 ret = 0;
260 }
261 p = port;
262 } while (ip++ < ip_to);
263 return ret;
264 }
265
266 /* IPv6 variant */
267
268 struct hash_netport6_elem {
269 union nf_inet_addr ip;
270 __be16 port;
271 u8 proto;
272 u8 cidr:7;
273 u8 nomatch:1;
274 };
275
276 /* Common functions */
277
278 static bool
hash_netport6_data_equal(const struct hash_netport6_elem * ip1,const struct hash_netport6_elem * ip2,u32 * multi)279 hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
280 const struct hash_netport6_elem *ip2,
281 u32 *multi)
282 {
283 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
284 ip1->port == ip2->port &&
285 ip1->proto == ip2->proto &&
286 ip1->cidr == ip2->cidr;
287 }
288
289 static int
hash_netport6_do_data_match(const struct hash_netport6_elem * elem)290 hash_netport6_do_data_match(const struct hash_netport6_elem *elem)
291 {
292 return elem->nomatch ? -ENOTEMPTY : 1;
293 }
294
295 static void
hash_netport6_data_set_flags(struct hash_netport6_elem * elem,u32 flags)296 hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags)
297 {
298 elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
299 }
300
301 static void
hash_netport6_data_reset_flags(struct hash_netport6_elem * elem,u8 * flags)302 hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags)
303 {
304 swap(*flags, elem->nomatch);
305 }
306
307 static void
hash_netport6_data_netmask(struct hash_netport6_elem * elem,u8 cidr)308 hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr)
309 {
310 ip6_netmask(&elem->ip, cidr);
311 elem->cidr = cidr - 1;
312 }
313
314 static bool
hash_netport6_data_list(struct sk_buff * skb,const struct hash_netport6_elem * data)315 hash_netport6_data_list(struct sk_buff *skb,
316 const struct hash_netport6_elem *data)
317 {
318 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
319
320 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
321 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
322 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
323 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
324 (flags &&
325 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
326 goto nla_put_failure;
327 return false;
328
329 nla_put_failure:
330 return true;
331 }
332
333 static void
hash_netport6_data_next(struct hash_netport6_elem * next,const struct hash_netport6_elem * d)334 hash_netport6_data_next(struct hash_netport6_elem *next,
335 const struct hash_netport6_elem *d)
336 {
337 next->port = d->port;
338 }
339
340 #undef MTYPE
341 #undef HOST_MASK
342
343 #define MTYPE hash_netport6
344 #define HOST_MASK 128
345 #define IP_SET_EMIT_CREATE
346 #include "ip_set_hash_gen.h"
347
348 static int
hash_netport6_kadt(struct ip_set * set,const struct sk_buff * skb,const struct xt_action_param * par,enum ipset_adt adt,struct ip_set_adt_opt * opt)349 hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb,
350 const struct xt_action_param *par,
351 enum ipset_adt adt, struct ip_set_adt_opt *opt)
352 {
353 const struct hash_netport6 *h = set->data;
354 ipset_adtfn adtfn = set->variant->adt[adt];
355 struct hash_netport6_elem e = {
356 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
357 };
358 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
359
360 if (adt == IPSET_TEST)
361 e.cidr = HOST_MASK - 1;
362
363 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
364 &e.port, &e.proto))
365 return -EINVAL;
366
367 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
368 ip6_netmask(&e.ip, e.cidr + 1);
369
370 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
371 }
372
373 static int
hash_netport6_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)374 hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[],
375 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
376 {
377 const struct hash_netport6 *h = set->data;
378 ipset_adtfn adtfn = set->variant->adt[adt];
379 struct hash_netport6_elem e = { .cidr = HOST_MASK - 1 };
380 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
381 u32 port, port_to;
382 bool with_ports = false;
383 u8 cidr;
384 int ret;
385
386 if (tb[IPSET_ATTR_LINENO])
387 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
388
389 if (unlikely(!tb[IPSET_ATTR_IP] ||
390 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
391 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
392 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
393 return -IPSET_ERR_PROTOCOL;
394 if (unlikely(tb[IPSET_ATTR_IP_TO]))
395 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
396
397 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
398 if (ret)
399 return ret;
400
401 ret = ip_set_get_extensions(set, tb, &ext);
402 if (ret)
403 return ret;
404
405 if (tb[IPSET_ATTR_CIDR]) {
406 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
407 if (!cidr || cidr > HOST_MASK)
408 return -IPSET_ERR_INVALID_CIDR;
409 e.cidr = cidr - 1;
410 }
411 ip6_netmask(&e.ip, e.cidr + 1);
412
413 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
414
415 if (tb[IPSET_ATTR_PROTO]) {
416 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
417 with_ports = ip_set_proto_with_ports(e.proto);
418
419 if (e.proto == 0)
420 return -IPSET_ERR_INVALID_PROTO;
421 } else {
422 return -IPSET_ERR_MISSING_PROTO;
423 }
424
425 if (!(with_ports || e.proto == IPPROTO_ICMPV6))
426 e.port = 0;
427
428 if (tb[IPSET_ATTR_CADT_FLAGS]) {
429 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
430
431 if (cadt_flags & IPSET_FLAG_NOMATCH)
432 flags |= (IPSET_FLAG_NOMATCH << 16);
433 }
434
435 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
436 ret = adtfn(set, &e, &ext, &ext, flags);
437 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
438 ip_set_eexist(ret, flags) ? 0 : ret;
439 }
440
441 port = ntohs(e.port);
442 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
443 if (port > port_to)
444 swap(port, port_to);
445
446 if (retried)
447 port = ntohs(h->next.port);
448 for (; port <= port_to; port++) {
449 e.port = htons(port);
450 ret = adtfn(set, &e, &ext, &ext, flags);
451
452 if (ret && !ip_set_eexist(ret, flags))
453 return ret;
454
455 ret = 0;
456 }
457 return ret;
458 }
459
460 static struct ip_set_type hash_netport_type __read_mostly = {
461 .name = "hash:net,port",
462 .protocol = IPSET_PROTOCOL,
463 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH,
464 .dimension = IPSET_DIM_TWO,
465 .family = NFPROTO_UNSPEC,
466 .revision_min = IPSET_TYPE_REV_MIN,
467 .revision_max = IPSET_TYPE_REV_MAX,
468 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
469 .create = hash_netport_create,
470 .create_policy = {
471 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
472 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
473 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
474 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
475 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
476 [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
477 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
478 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
479 },
480 .adt_policy = {
481 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
482 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
483 [IPSET_ATTR_PORT] = { .type = NLA_U16 },
484 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
485 [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
486 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
487 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
488 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
489 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
490 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
491 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
492 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
493 .len = IPSET_MAX_COMMENT_SIZE },
494 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
495 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
496 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
497 },
498 .me = THIS_MODULE,
499 };
500
501 static int __init
hash_netport_init(void)502 hash_netport_init(void)
503 {
504 return ip_set_type_register(&hash_netport_type);
505 }
506
507 static void __exit
hash_netport_fini(void)508 hash_netport_fini(void)
509 {
510 rcu_barrier();
511 ip_set_type_unregister(&hash_netport_type);
512 }
513
514 module_init(hash_netport_init);
515 module_exit(hash_netport_fini);
516