1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2011-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
3
4 /* Kernel module implementing an IP set type: the hash:net,iface 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_bridge.h>
18 #include <linux/netfilter/ipset/pfxlen.h>
19 #include <linux/netfilter/ipset/ip_set.h>
20 #include <linux/netfilter/ipset/ip_set_hash.h>
21
22 #define IPSET_TYPE_REV_MIN 0
23 /* 1 nomatch flag support added */
24 /* 2 /0 support added */
25 /* 3 Counters support added */
26 /* 4 Comments support added */
27 /* 5 Forceadd support added */
28 /* 6 skbinfo support added */
29 #define IPSET_TYPE_REV_MAX 7 /* interface wildcard support added */
30
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
33 IP_SET_MODULE_DESC("hash:net,iface", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
34 MODULE_ALIAS("ip_set_hash:net,iface");
35
36 /* Type specific function prefix */
37 #define HTYPE hash_netiface
38 #define IP_SET_HASH_WITH_NETS
39 #define IP_SET_HASH_WITH_MULTI
40 #define IP_SET_HASH_WITH_NET0
41
42 #define STRLCPY(a, b) strlcpy(a, b, IFNAMSIZ)
43
44 /* IPv4 variant */
45
46 struct hash_netiface4_elem_hashed {
47 __be32 ip;
48 u8 physdev;
49 u8 cidr;
50 u8 nomatch;
51 u8 elem;
52 };
53
54 /* Member elements */
55 struct hash_netiface4_elem {
56 __be32 ip;
57 u8 physdev;
58 u8 cidr;
59 u8 nomatch;
60 u8 elem;
61 u8 wildcard;
62 char iface[IFNAMSIZ];
63 };
64
65 /* Common functions */
66
67 static bool
hash_netiface4_data_equal(const struct hash_netiface4_elem * ip1,const struct hash_netiface4_elem * ip2,u32 * multi)68 hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
69 const struct hash_netiface4_elem *ip2,
70 u32 *multi)
71 {
72 return ip1->ip == ip2->ip &&
73 ip1->cidr == ip2->cidr &&
74 (++*multi) &&
75 ip1->physdev == ip2->physdev &&
76 (ip1->wildcard ?
77 strncmp(ip1->iface, ip2->iface, strlen(ip1->iface)) == 0 :
78 strcmp(ip1->iface, ip2->iface) == 0);
79 }
80
81 static int
hash_netiface4_do_data_match(const struct hash_netiface4_elem * elem)82 hash_netiface4_do_data_match(const struct hash_netiface4_elem *elem)
83 {
84 return elem->nomatch ? -ENOTEMPTY : 1;
85 }
86
87 static void
hash_netiface4_data_set_flags(struct hash_netiface4_elem * elem,u32 flags)88 hash_netiface4_data_set_flags(struct hash_netiface4_elem *elem, u32 flags)
89 {
90 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
91 }
92
93 static void
hash_netiface4_data_reset_flags(struct hash_netiface4_elem * elem,u8 * flags)94 hash_netiface4_data_reset_flags(struct hash_netiface4_elem *elem, u8 *flags)
95 {
96 swap(*flags, elem->nomatch);
97 }
98
99 static void
hash_netiface4_data_netmask(struct hash_netiface4_elem * elem,u8 cidr)100 hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr)
101 {
102 elem->ip &= ip_set_netmask(cidr);
103 elem->cidr = cidr;
104 }
105
106 static bool
hash_netiface4_data_list(struct sk_buff * skb,const struct hash_netiface4_elem * data)107 hash_netiface4_data_list(struct sk_buff *skb,
108 const struct hash_netiface4_elem *data)
109 {
110 u32 flags = (data->physdev ? IPSET_FLAG_PHYSDEV : 0) |
111 (data->wildcard ? IPSET_FLAG_IFACE_WILDCARD : 0);
112
113 if (data->nomatch)
114 flags |= IPSET_FLAG_NOMATCH;
115 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
116 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
117 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
118 (flags &&
119 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
120 goto nla_put_failure;
121 return false;
122
123 nla_put_failure:
124 return true;
125 }
126
127 static void
hash_netiface4_data_next(struct hash_netiface4_elem * next,const struct hash_netiface4_elem * d)128 hash_netiface4_data_next(struct hash_netiface4_elem *next,
129 const struct hash_netiface4_elem *d)
130 {
131 next->ip = d->ip;
132 }
133
134 #define MTYPE hash_netiface4
135 #define HOST_MASK 32
136 #define HKEY_DATALEN sizeof(struct hash_netiface4_elem_hashed)
137 #include "ip_set_hash_gen.h"
138
139 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
get_physindev_name(const struct sk_buff * skb)140 static const char *get_physindev_name(const struct sk_buff *skb)
141 {
142 struct net_device *dev = nf_bridge_get_physindev(skb);
143
144 return dev ? dev->name : NULL;
145 }
146
get_physoutdev_name(const struct sk_buff * skb)147 static const char *get_physoutdev_name(const struct sk_buff *skb)
148 {
149 struct net_device *dev = nf_bridge_get_physoutdev(skb);
150
151 return dev ? dev->name : NULL;
152 }
153 #endif
154
155 static int
hash_netiface4_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)156 hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb,
157 const struct xt_action_param *par,
158 enum ipset_adt adt, struct ip_set_adt_opt *opt)
159 {
160 struct hash_netiface4 *h = set->data;
161 ipset_adtfn adtfn = set->variant->adt[adt];
162 struct hash_netiface4_elem e = {
163 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
164 .elem = 1,
165 };
166 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
167
168 if (adt == IPSET_TEST)
169 e.cidr = HOST_MASK;
170
171 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
172 e.ip &= ip_set_netmask(e.cidr);
173
174 #define IFACE(dir) (par->state->dir ? par->state->dir->name : "")
175 #define SRCDIR (opt->flags & IPSET_DIM_TWO_SRC)
176
177 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
178 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
179 const char *eiface = SRCDIR ? get_physindev_name(skb) :
180 get_physoutdev_name(skb);
181
182 if (!eiface)
183 return -EINVAL;
184 STRLCPY(e.iface, eiface);
185 e.physdev = 1;
186 #endif
187 } else {
188 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));
189 }
190
191 if (strlen(e.iface) == 0)
192 return -EINVAL;
193 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
194 }
195
196 static int
hash_netiface4_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)197 hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
198 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
199 {
200 struct hash_netiface4 *h = set->data;
201 ipset_adtfn adtfn = set->variant->adt[adt];
202 struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 };
203 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
204 u32 ip = 0, ip_to = 0;
205 int ret;
206
207 if (tb[IPSET_ATTR_LINENO])
208 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
209
210 if (unlikely(!tb[IPSET_ATTR_IP] ||
211 !tb[IPSET_ATTR_IFACE] ||
212 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
213 return -IPSET_ERR_PROTOCOL;
214
215 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
216 if (ret)
217 return ret;
218
219 ret = ip_set_get_extensions(set, tb, &ext);
220 if (ret)
221 return ret;
222
223 if (tb[IPSET_ATTR_CIDR]) {
224 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
225 if (e.cidr > HOST_MASK)
226 return -IPSET_ERR_INVALID_CIDR;
227 }
228 nla_strlcpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ);
229
230 if (tb[IPSET_ATTR_CADT_FLAGS]) {
231 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
232
233 if (cadt_flags & IPSET_FLAG_PHYSDEV)
234 e.physdev = 1;
235 if (cadt_flags & IPSET_FLAG_NOMATCH)
236 flags |= (IPSET_FLAG_NOMATCH << 16);
237 if (cadt_flags & IPSET_FLAG_IFACE_WILDCARD)
238 e.wildcard = 1;
239 }
240 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
241 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
242 ret = adtfn(set, &e, &ext, &ext, flags);
243 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
244 ip_set_eexist(ret, flags) ? 0 : ret;
245 }
246
247 if (tb[IPSET_ATTR_IP_TO]) {
248 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
249 if (ret)
250 return ret;
251 if (ip_to < ip)
252 swap(ip, ip_to);
253 if (ip + UINT_MAX == ip_to)
254 return -IPSET_ERR_HASH_RANGE;
255 } else {
256 ip_set_mask_from_to(ip, ip_to, e.cidr);
257 }
258
259 if (retried)
260 ip = ntohl(h->next.ip);
261 do {
262 e.ip = htonl(ip);
263 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
264 ret = adtfn(set, &e, &ext, &ext, flags);
265
266 if (ret && !ip_set_eexist(ret, flags))
267 return ret;
268
269 ret = 0;
270 } while (ip++ < ip_to);
271 return ret;
272 }
273
274 /* IPv6 variant */
275
276 struct hash_netiface6_elem_hashed {
277 union nf_inet_addr ip;
278 u8 physdev;
279 u8 cidr;
280 u8 nomatch;
281 u8 elem;
282 };
283
284 struct hash_netiface6_elem {
285 union nf_inet_addr ip;
286 u8 physdev;
287 u8 cidr;
288 u8 nomatch;
289 u8 elem;
290 u8 wildcard;
291 char iface[IFNAMSIZ];
292 };
293
294 /* Common functions */
295
296 static bool
hash_netiface6_data_equal(const struct hash_netiface6_elem * ip1,const struct hash_netiface6_elem * ip2,u32 * multi)297 hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
298 const struct hash_netiface6_elem *ip2,
299 u32 *multi)
300 {
301 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
302 ip1->cidr == ip2->cidr &&
303 (++*multi) &&
304 ip1->physdev == ip2->physdev &&
305 (ip1->wildcard ?
306 strncmp(ip1->iface, ip2->iface, strlen(ip1->iface)) == 0 :
307 strcmp(ip1->iface, ip2->iface) == 0);
308 }
309
310 static int
hash_netiface6_do_data_match(const struct hash_netiface6_elem * elem)311 hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem)
312 {
313 return elem->nomatch ? -ENOTEMPTY : 1;
314 }
315
316 static void
hash_netiface6_data_set_flags(struct hash_netiface6_elem * elem,u32 flags)317 hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags)
318 {
319 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
320 }
321
322 static void
hash_netiface6_data_reset_flags(struct hash_netiface6_elem * elem,u8 * flags)323 hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags)
324 {
325 swap(*flags, elem->nomatch);
326 }
327
328 static void
hash_netiface6_data_netmask(struct hash_netiface6_elem * elem,u8 cidr)329 hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr)
330 {
331 ip6_netmask(&elem->ip, cidr);
332 elem->cidr = cidr;
333 }
334
335 static bool
hash_netiface6_data_list(struct sk_buff * skb,const struct hash_netiface6_elem * data)336 hash_netiface6_data_list(struct sk_buff *skb,
337 const struct hash_netiface6_elem *data)
338 {
339 u32 flags = (data->physdev ? IPSET_FLAG_PHYSDEV : 0) |
340 (data->wildcard ? IPSET_FLAG_IFACE_WILDCARD : 0);
341
342 if (data->nomatch)
343 flags |= IPSET_FLAG_NOMATCH;
344 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
345 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
346 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
347 (flags &&
348 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
349 goto nla_put_failure;
350 return false;
351
352 nla_put_failure:
353 return true;
354 }
355
356 static void
hash_netiface6_data_next(struct hash_netiface6_elem * next,const struct hash_netiface6_elem * d)357 hash_netiface6_data_next(struct hash_netiface6_elem *next,
358 const struct hash_netiface6_elem *d)
359 {
360 }
361
362 #undef MTYPE
363 #undef HOST_MASK
364
365 #define MTYPE hash_netiface6
366 #define HOST_MASK 128
367 #define HKEY_DATALEN sizeof(struct hash_netiface6_elem_hashed)
368 #define IP_SET_EMIT_CREATE
369 #include "ip_set_hash_gen.h"
370
371 static int
hash_netiface6_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)372 hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb,
373 const struct xt_action_param *par,
374 enum ipset_adt adt, struct ip_set_adt_opt *opt)
375 {
376 struct hash_netiface6 *h = set->data;
377 ipset_adtfn adtfn = set->variant->adt[adt];
378 struct hash_netiface6_elem e = {
379 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
380 .elem = 1,
381 };
382 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
383
384 if (adt == IPSET_TEST)
385 e.cidr = HOST_MASK;
386
387 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
388 ip6_netmask(&e.ip, e.cidr);
389
390 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
391 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
392 const char *eiface = SRCDIR ? get_physindev_name(skb) :
393 get_physoutdev_name(skb);
394
395 if (!eiface)
396 return -EINVAL;
397 STRLCPY(e.iface, eiface);
398 e.physdev = 1;
399 #endif
400 } else {
401 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));
402 }
403
404 if (strlen(e.iface) == 0)
405 return -EINVAL;
406
407 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
408 }
409
410 static int
hash_netiface6_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)411 hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
412 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
413 {
414 ipset_adtfn adtfn = set->variant->adt[adt];
415 struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 };
416 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
417 int ret;
418
419 if (tb[IPSET_ATTR_LINENO])
420 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
421
422 if (unlikely(!tb[IPSET_ATTR_IP] ||
423 !tb[IPSET_ATTR_IFACE] ||
424 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
425 return -IPSET_ERR_PROTOCOL;
426 if (unlikely(tb[IPSET_ATTR_IP_TO]))
427 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
428
429 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
430 if (ret)
431 return ret;
432
433 ret = ip_set_get_extensions(set, tb, &ext);
434 if (ret)
435 return ret;
436
437 if (tb[IPSET_ATTR_CIDR]) {
438 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
439 if (e.cidr > HOST_MASK)
440 return -IPSET_ERR_INVALID_CIDR;
441 }
442
443 ip6_netmask(&e.ip, e.cidr);
444
445 nla_strlcpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ);
446
447 if (tb[IPSET_ATTR_CADT_FLAGS]) {
448 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
449
450 if (cadt_flags & IPSET_FLAG_PHYSDEV)
451 e.physdev = 1;
452 if (cadt_flags & IPSET_FLAG_NOMATCH)
453 flags |= (IPSET_FLAG_NOMATCH << 16);
454 if (cadt_flags & IPSET_FLAG_IFACE_WILDCARD)
455 e.wildcard = 1;
456 }
457
458 ret = adtfn(set, &e, &ext, &ext, flags);
459
460 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
461 ip_set_eexist(ret, flags) ? 0 : ret;
462 }
463
464 static struct ip_set_type hash_netiface_type __read_mostly = {
465 .name = "hash:net,iface",
466 .protocol = IPSET_PROTOCOL,
467 .features = IPSET_TYPE_IP | IPSET_TYPE_IFACE |
468 IPSET_TYPE_NOMATCH,
469 .dimension = IPSET_DIM_TWO,
470 .family = NFPROTO_UNSPEC,
471 .revision_min = IPSET_TYPE_REV_MIN,
472 .revision_max = IPSET_TYPE_REV_MAX,
473 .create = hash_netiface_create,
474 .create_policy = {
475 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
476 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
477 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
478 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
479 [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
480 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
481 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
482 },
483 .adt_policy = {
484 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
485 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
486 [IPSET_ATTR_IFACE] = { .type = NLA_NUL_STRING,
487 .len = IFNAMSIZ - 1 },
488 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
489 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
490 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
491 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
492 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
493 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
494 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
495 .len = IPSET_MAX_COMMENT_SIZE },
496 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
497 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
498 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
499 },
500 .me = THIS_MODULE,
501 };
502
503 static int __init
hash_netiface_init(void)504 hash_netiface_init(void)
505 {
506 return ip_set_type_register(&hash_netiface_type);
507 }
508
509 static void __exit
hash_netiface_fini(void)510 hash_netiface_fini(void)
511 {
512 rcu_barrier();
513 ip_set_type_unregister(&hash_netiface_type);
514 }
515
516 module_init(hash_netiface_init);
517 module_exit(hash_netiface_fini);
518