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