1
2
3
4
5
6
7
8
9
10#include <linux/jhash.h>
11#include <linux/module.h>
12#include <linux/ip.h>
13#include <linux/skbuff.h>
14#include <linux/errno.h>
15#include <linux/random.h>
16#include <net/ip.h>
17#include <net/ipv6.h>
18#include <net/netlink.h>
19
20#include <linux/netfilter.h>
21#include <linux/netfilter_bridge.h>
22#include <linux/netfilter/ipset/pfxlen.h>
23#include <linux/netfilter/ipset/ip_set.h>
24#include <linux/netfilter/ipset/ip_set_hash.h>
25
26#define IPSET_TYPE_REV_MIN 0
27
28
29
30
31
32#define IPSET_TYPE_REV_MAX 6
33
34MODULE_LICENSE("GPL");
35MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
36IP_SET_MODULE_DESC("hash:net,iface", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
37MODULE_ALIAS("ip_set_hash:net,iface");
38
39
40#define HTYPE hash_netiface
41#define IP_SET_HASH_WITH_NETS
42#define IP_SET_HASH_WITH_MULTI
43#define IP_SET_HASH_WITH_NET0
44
45#define STRLCPY(a, b) strlcpy(a, b, IFNAMSIZ)
46
47
48
49struct hash_netiface4_elem_hashed {
50 __be32 ip;
51 u8 physdev;
52 u8 cidr;
53 u8 nomatch;
54 u8 elem;
55};
56
57
58struct hash_netiface4_elem {
59 __be32 ip;
60 u8 physdev;
61 u8 cidr;
62 u8 nomatch;
63 u8 elem;
64 char iface[IFNAMSIZ];
65};
66
67
68
69static inline bool
70hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
71 const struct hash_netiface4_elem *ip2,
72 u32 *multi)
73{
74 return ip1->ip == ip2->ip &&
75 ip1->cidr == ip2->cidr &&
76 (++*multi) &&
77 ip1->physdev == ip2->physdev &&
78 strcmp(ip1->iface, ip2->iface) == 0;
79}
80
81static inline int
82hash_netiface4_do_data_match(const struct hash_netiface4_elem *elem)
83{
84 return elem->nomatch ? -ENOTEMPTY : 1;
85}
86
87static inline void
88hash_netiface4_data_set_flags(struct hash_netiface4_elem *elem, u32 flags)
89{
90 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
91}
92
93static inline void
94hash_netiface4_data_reset_flags(struct hash_netiface4_elem *elem, u8 *flags)
95{
96 swap(*flags, elem->nomatch);
97}
98
99static inline void
100hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr)
101{
102 elem->ip &= ip_set_netmask(cidr);
103 elem->cidr = cidr;
104}
105
106static bool
107hash_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
112 if (data->nomatch)
113 flags |= IPSET_FLAG_NOMATCH;
114 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
115 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
116 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
117 (flags &&
118 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
119 goto nla_put_failure;
120 return false;
121
122nla_put_failure:
123 return true;
124}
125
126static inline void
127hash_netiface4_data_next(struct hash_netiface4_elem *next,
128 const struct hash_netiface4_elem *d)
129{
130 next->ip = d->ip;
131}
132
133#define MTYPE hash_netiface4
134#define HOST_MASK 32
135#define HKEY_DATALEN sizeof(struct hash_netiface4_elem_hashed)
136#include "ip_set_hash_gen.h"
137
138#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
139static const char *get_physindev_name(const struct sk_buff *skb)
140{
141 struct net_device *dev = nf_bridge_get_physindev(skb);
142
143 return dev ? dev->name : NULL;
144}
145
146static const char *get_physoutdev_name(const struct sk_buff *skb)
147{
148 struct net_device *dev = nf_bridge_get_physoutdev(skb);
149
150 return dev ? dev->name : NULL;
151}
152#endif
153
154static int
155hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb,
156 const struct xt_action_param *par,
157 enum ipset_adt adt, struct ip_set_adt_opt *opt)
158{
159 struct hash_netiface4 *h = set->data;
160 ipset_adtfn adtfn = set->variant->adt[adt];
161 struct hash_netiface4_elem e = {
162 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
163 .elem = 1,
164 };
165 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
166
167 if (adt == IPSET_TEST)
168 e.cidr = HOST_MASK;
169
170 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
171 e.ip &= ip_set_netmask(e.cidr);
172
173#define IFACE(dir) (par->state->dir ? par->state->dir->name : "")
174#define SRCDIR (opt->flags & IPSET_DIM_TWO_SRC)
175
176 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
177#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
178 const char *eiface = SRCDIR ? get_physindev_name(skb) :
179 get_physoutdev_name(skb);
180
181 if (!eiface)
182 return -EINVAL;
183 STRLCPY(e.iface, eiface);
184 e.physdev = 1;
185#endif
186 } else {
187 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));
188 }
189
190 if (strlen(e.iface) == 0)
191 return -EINVAL;
192 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
193}
194
195static int
196hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
197 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
198{
199 struct hash_netiface4 *h = set->data;
200 ipset_adtfn adtfn = set->variant->adt[adt];
201 struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 };
202 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
203 u32 ip = 0, ip_to = 0, last;
204 int ret;
205
206 if (tb[IPSET_ATTR_LINENO])
207 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
208
209 if (unlikely(!tb[IPSET_ATTR_IP] ||
210 !tb[IPSET_ATTR_IFACE] ||
211 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
212 return -IPSET_ERR_PROTOCOL;
213
214 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
215 if (ret)
216 return ret;
217
218 ret = ip_set_get_extensions(set, tb, &ext);
219 if (ret)
220 return ret;
221
222 if (tb[IPSET_ATTR_CIDR]) {
223 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
224 if (e.cidr > HOST_MASK)
225 return -IPSET_ERR_INVALID_CIDR;
226 }
227 nla_strlcpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ);
228
229 if (tb[IPSET_ATTR_CADT_FLAGS]) {
230 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
231
232 if (cadt_flags & IPSET_FLAG_PHYSDEV)
233 e.physdev = 1;
234 if (cadt_flags & IPSET_FLAG_NOMATCH)
235 flags |= (IPSET_FLAG_NOMATCH << 16);
236 }
237 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
238 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
239 ret = adtfn(set, &e, &ext, &ext, flags);
240 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
241 ip_set_eexist(ret, flags) ? 0 : ret;
242 }
243
244 if (tb[IPSET_ATTR_IP_TO]) {
245 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
246 if (ret)
247 return ret;
248 if (ip_to < ip)
249 swap(ip, ip_to);
250 if (ip + UINT_MAX == ip_to)
251 return -IPSET_ERR_HASH_RANGE;
252 } else {
253 ip_set_mask_from_to(ip, ip_to, e.cidr);
254 }
255
256 if (retried)
257 ip = ntohl(h->next.ip);
258 while (!after(ip, ip_to)) {
259 e.ip = htonl(ip);
260 last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
261 ret = adtfn(set, &e, &ext, &ext, flags);
262
263 if (ret && !ip_set_eexist(ret, flags))
264 return ret;
265
266 ret = 0;
267 ip = last + 1;
268 }
269 return ret;
270}
271
272
273
274struct hash_netiface6_elem_hashed {
275 union nf_inet_addr ip;
276 u8 physdev;
277 u8 cidr;
278 u8 nomatch;
279 u8 elem;
280};
281
282struct hash_netiface6_elem {
283 union nf_inet_addr ip;
284 u8 physdev;
285 u8 cidr;
286 u8 nomatch;
287 u8 elem;
288 char iface[IFNAMSIZ];
289};
290
291
292
293static inline bool
294hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
295 const struct hash_netiface6_elem *ip2,
296 u32 *multi)
297{
298 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
299 ip1->cidr == ip2->cidr &&
300 (++*multi) &&
301 ip1->physdev == ip2->physdev &&
302 strcmp(ip1->iface, ip2->iface) == 0;
303}
304
305static inline int
306hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem)
307{
308 return elem->nomatch ? -ENOTEMPTY : 1;
309}
310
311static inline void
312hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags)
313{
314 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
315}
316
317static inline void
318hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags)
319{
320 swap(*flags, elem->nomatch);
321}
322
323static inline void
324hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr)
325{
326 ip6_netmask(&elem->ip, cidr);
327 elem->cidr = cidr;
328}
329
330static bool
331hash_netiface6_data_list(struct sk_buff *skb,
332 const struct hash_netiface6_elem *data)
333{
334 u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
335
336 if (data->nomatch)
337 flags |= IPSET_FLAG_NOMATCH;
338 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
339 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
340 nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
341 (flags &&
342 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
343 goto nla_put_failure;
344 return false;
345
346nla_put_failure:
347 return true;
348}
349
350static inline void
351hash_netiface6_data_next(struct hash_netiface6_elem *next,
352 const struct hash_netiface6_elem *d)
353{
354}
355
356#undef MTYPE
357#undef HOST_MASK
358
359#define MTYPE hash_netiface6
360#define HOST_MASK 128
361#define HKEY_DATALEN sizeof(struct hash_netiface6_elem_hashed)
362#define IP_SET_EMIT_CREATE
363#include "ip_set_hash_gen.h"
364
365static int
366hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb,
367 const struct xt_action_param *par,
368 enum ipset_adt adt, struct ip_set_adt_opt *opt)
369{
370 struct hash_netiface6 *h = set->data;
371 ipset_adtfn adtfn = set->variant->adt[adt];
372 struct hash_netiface6_elem e = {
373 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
374 .elem = 1,
375 };
376 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
377
378 if (adt == IPSET_TEST)
379 e.cidr = HOST_MASK;
380
381 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
382 ip6_netmask(&e.ip, e.cidr);
383
384 if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
385#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
386 const char *eiface = SRCDIR ? get_physindev_name(skb) :
387 get_physoutdev_name(skb);
388
389 if (!eiface)
390 return -EINVAL;
391 STRLCPY(e.iface, eiface);
392 e.physdev = 1;
393#endif
394 } else {
395 STRLCPY(e.iface, SRCDIR ? IFACE(in) : IFACE(out));
396 }
397
398 if (strlen(e.iface) == 0)
399 return -EINVAL;
400
401 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
402}
403
404static int
405hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
406 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
407{
408 ipset_adtfn adtfn = set->variant->adt[adt];
409 struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 };
410 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
411 int ret;
412
413 if (tb[IPSET_ATTR_LINENO])
414 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
415
416 if (unlikely(!tb[IPSET_ATTR_IP] ||
417 !tb[IPSET_ATTR_IFACE] ||
418 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
419 return -IPSET_ERR_PROTOCOL;
420 if (unlikely(tb[IPSET_ATTR_IP_TO]))
421 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
422
423 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
424 if (ret)
425 return ret;
426
427 ret = ip_set_get_extensions(set, tb, &ext);
428 if (ret)
429 return ret;
430
431 if (tb[IPSET_ATTR_CIDR]) {
432 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
433 if (e.cidr > HOST_MASK)
434 return -IPSET_ERR_INVALID_CIDR;
435 }
436
437 ip6_netmask(&e.ip, e.cidr);
438
439 nla_strlcpy(e.iface, tb[IPSET_ATTR_IFACE], IFNAMSIZ);
440
441 if (tb[IPSET_ATTR_CADT_FLAGS]) {
442 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
443
444 if (cadt_flags & IPSET_FLAG_PHYSDEV)
445 e.physdev = 1;
446 if (cadt_flags & IPSET_FLAG_NOMATCH)
447 flags |= (IPSET_FLAG_NOMATCH << 16);
448 }
449
450 ret = adtfn(set, &e, &ext, &ext, flags);
451
452 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
453 ip_set_eexist(ret, flags) ? 0 : ret;
454}
455
456static struct ip_set_type hash_netiface_type __read_mostly = {
457 .name = "hash:net,iface",
458 .protocol = IPSET_PROTOCOL,
459 .features = IPSET_TYPE_IP | IPSET_TYPE_IFACE |
460 IPSET_TYPE_NOMATCH,
461 .dimension = IPSET_DIM_TWO,
462 .family = NFPROTO_UNSPEC,
463 .revision_min = IPSET_TYPE_REV_MIN,
464 .revision_max = IPSET_TYPE_REV_MAX,
465 .create = hash_netiface_create,
466 .create_policy = {
467 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
468 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
469 [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
470 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
471 [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
472 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
473 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
474 },
475 .adt_policy = {
476 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
477 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
478 [IPSET_ATTR_IFACE] = { .type = NLA_NUL_STRING,
479 .len = IFNAMSIZ - 1 },
480 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
481 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
482 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
483 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
484 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
485 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
486 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
487 .len = IPSET_MAX_COMMENT_SIZE },
488 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
489 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
490 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
491 },
492 .me = THIS_MODULE,
493};
494
495static int __init
496hash_netiface_init(void)
497{
498 return ip_set_type_register(&hash_netiface_type);
499}
500
501static void __exit
502hash_netiface_fini(void)
503{
504 rcu_barrier();
505 ip_set_type_unregister(&hash_netiface_type);
506}
507
508module_init(hash_netiface_init);
509module_exit(hash_netiface_fini);
510
