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TOMOYO Linux Cross Reference
Linux/net/netfilter/ipset/ip_set_hash_netnet.c

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  1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  2  * Copyright (C) 2013 Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  */
  8 
  9 /* Kernel module implementing an IP set type: the hash:net type */
 10 
 11 #include <linux/jhash.h>
 12 #include <linux/module.h>
 13 #include <linux/ip.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/errno.h>
 16 #include <linux/random.h>
 17 #include <net/ip.h>
 18 #include <net/ipv6.h>
 19 #include <net/netlink.h>
 20 
 21 #include <linux/netfilter.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 /*                              1          Forceadd support added */
 28 #define IPSET_TYPE_REV_MAX      2       /* skbinfo support added */
 29 
 30 MODULE_LICENSE("GPL");
 31 MODULE_AUTHOR("Oliver Smith <oliver@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>");
 32 IP_SET_MODULE_DESC("hash:net,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 33 MODULE_ALIAS("ip_set_hash:net,net");
 34 
 35 /* Type specific function prefix */
 36 #define HTYPE           hash_netnet
 37 #define IP_SET_HASH_WITH_NETS
 38 #define IPSET_NET_COUNT 2
 39 
 40 /* IPv4 variants */
 41 
 42 /* Member elements  */
 43 struct hash_netnet4_elem {
 44         union {
 45                 __be32 ip[2];
 46                 __be64 ipcmp;
 47         };
 48         u8 nomatch;
 49         u8 padding;
 50         union {
 51                 u8 cidr[2];
 52                 u16 ccmp;
 53         };
 54 };
 55 
 56 /* Common functions */
 57 
 58 static inline bool
 59 hash_netnet4_data_equal(const struct hash_netnet4_elem *ip1,
 60                         const struct hash_netnet4_elem *ip2,
 61                         u32 *multi)
 62 {
 63         return ip1->ipcmp == ip2->ipcmp &&
 64                ip1->ccmp == ip2->ccmp;
 65 }
 66 
 67 static inline int
 68 hash_netnet4_do_data_match(const struct hash_netnet4_elem *elem)
 69 {
 70         return elem->nomatch ? -ENOTEMPTY : 1;
 71 }
 72 
 73 static inline void
 74 hash_netnet4_data_set_flags(struct hash_netnet4_elem *elem, u32 flags)
 75 {
 76         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
 77 }
 78 
 79 static inline void
 80 hash_netnet4_data_reset_flags(struct hash_netnet4_elem *elem, u8 *flags)
 81 {
 82         swap(*flags, elem->nomatch);
 83 }
 84 
 85 static inline void
 86 hash_netnet4_data_reset_elem(struct hash_netnet4_elem *elem,
 87                              struct hash_netnet4_elem *orig)
 88 {
 89         elem->ip[1] = orig->ip[1];
 90 }
 91 
 92 static inline void
 93 hash_netnet4_data_netmask(struct hash_netnet4_elem *elem, u8 cidr, bool inner)
 94 {
 95         if (inner) {
 96                 elem->ip[1] &= ip_set_netmask(cidr);
 97                 elem->cidr[1] = cidr;
 98         } else {
 99                 elem->ip[0] &= ip_set_netmask(cidr);
100                 elem->cidr[0] = cidr;
101         }
102 }
103 
104 static bool
105 hash_netnet4_data_list(struct sk_buff *skb,
106                        const struct hash_netnet4_elem *data)
107 {
108         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
109 
110         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip[0]) ||
111             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip[1]) ||
112             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
113             nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
114             (flags &&
115              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
116                 goto nla_put_failure;
117         return false;
118 
119 nla_put_failure:
120         return true;
121 }
122 
123 static inline void
124 hash_netnet4_data_next(struct hash_netnet4_elem *next,
125                        const struct hash_netnet4_elem *d)
126 {
127         next->ipcmp = d->ipcmp;
128 }
129 
130 #define MTYPE           hash_netnet4
131 #define HOST_MASK       32
132 #include "ip_set_hash_gen.h"
133 
134 static void
135 hash_netnet4_init(struct hash_netnet4_elem *e)
136 {
137         e->cidr[0] = HOST_MASK;
138         e->cidr[1] = HOST_MASK;
139 }
140 
141 static int
142 hash_netnet4_kadt(struct ip_set *set, const struct sk_buff *skb,
143                   const struct xt_action_param *par,
144                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
145 {
146         const struct hash_netnet4 *h = set->data;
147         ipset_adtfn adtfn = set->variant->adt[adt];
148         struct hash_netnet4_elem e = { };
149         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
150 
151         e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
152         e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
153         if (adt == IPSET_TEST)
154                 e.ccmp = (HOST_MASK << (sizeof(e.cidr[0]) * 8)) | HOST_MASK;
155 
156         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0]);
157         ip4addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1]);
158         e.ip[0] &= ip_set_netmask(e.cidr[0]);
159         e.ip[1] &= ip_set_netmask(e.cidr[1]);
160 
161         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
162 }
163 
164 static int
165 hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
166                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
167 {
168         const struct hash_netnet4 *h = set->data;
169         ipset_adtfn adtfn = set->variant->adt[adt];
170         struct hash_netnet4_elem e = { };
171         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
172         u32 ip = 0, ip_to = 0;
173         u32 ip2 = 0, ip2_from = 0, ip2_to = 0;
174         int ret;
175 
176         if (tb[IPSET_ATTR_LINENO])
177                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
178 
179         hash_netnet4_init(&e);
180         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
181                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
182                 return -IPSET_ERR_PROTOCOL;
183 
184         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
185         if (ret)
186                 return ret;
187 
188         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from);
189         if (ret)
190                 return ret;
191 
192         ret = ip_set_get_extensions(set, tb, &ext);
193         if (ret)
194                 return ret;
195 
196         if (tb[IPSET_ATTR_CIDR]) {
197                 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
198                 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
199                         return -IPSET_ERR_INVALID_CIDR;
200         }
201 
202         if (tb[IPSET_ATTR_CIDR2]) {
203                 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
204                 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
205                         return -IPSET_ERR_INVALID_CIDR;
206         }
207 
208         if (tb[IPSET_ATTR_CADT_FLAGS]) {
209                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
210 
211                 if (cadt_flags & IPSET_FLAG_NOMATCH)
212                         flags |= (IPSET_FLAG_NOMATCH << 16);
213         }
214 
215         if (adt == IPSET_TEST || !(tb[IPSET_ATTR_IP_TO] ||
216                                    tb[IPSET_ATTR_IP2_TO])) {
217                 e.ip[0] = htonl(ip & ip_set_hostmask(e.cidr[0]));
218                 e.ip[1] = htonl(ip2_from & ip_set_hostmask(e.cidr[1]));
219                 ret = adtfn(set, &e, &ext, &ext, flags);
220                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
221                        ip_set_eexist(ret, flags) ? 0 : ret;
222         }
223 
224         ip_to = ip;
225         if (tb[IPSET_ATTR_IP_TO]) {
226                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
227                 if (ret)
228                         return ret;
229                 if (ip_to < ip)
230                         swap(ip, ip_to);
231                 if (unlikely(ip + UINT_MAX == ip_to))
232                         return -IPSET_ERR_HASH_RANGE;
233         } else {
234                 ip_set_mask_from_to(ip, ip_to, e.cidr[0]);
235         }
236 
237         ip2_to = ip2_from;
238         if (tb[IPSET_ATTR_IP2_TO]) {
239                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
240                 if (ret)
241                         return ret;
242                 if (ip2_to < ip2_from)
243                         swap(ip2_from, ip2_to);
244                 if (unlikely(ip2_from + UINT_MAX == ip2_to))
245                         return -IPSET_ERR_HASH_RANGE;
246         } else {
247                 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]);
248         }
249 
250         if (retried) {
251                 ip = ntohl(h->next.ip[0]);
252                 ip2 = ntohl(h->next.ip[1]);
253         } else {
254                 ip2 = ip2_from;
255         }
256 
257         do {
258                 e.ip[0] = htonl(ip);
259                 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr[0]);
260                 do {
261                         e.ip[1] = htonl(ip2);
262                         ip2 = ip_set_range_to_cidr(ip2, ip2_to, &e.cidr[1]);
263                         ret = adtfn(set, &e, &ext, &ext, flags);
264                         if (ret && !ip_set_eexist(ret, flags))
265                                 return ret;
266 
267                         ret = 0;
268                 } while (ip2++ < ip2_to);
269                 ip2 = ip2_from;
270         } while (ip++ < ip_to);
271         return ret;
272 }
273 
274 /* IPv6 variants */
275 
276 struct hash_netnet6_elem {
277         union nf_inet_addr ip[2];
278         u8 nomatch;
279         u8 padding;
280         union {
281                 u8 cidr[2];
282                 u16 ccmp;
283         };
284 };
285 
286 /* Common functions */
287 
288 static inline bool
289 hash_netnet6_data_equal(const struct hash_netnet6_elem *ip1,
290                         const struct hash_netnet6_elem *ip2,
291                         u32 *multi)
292 {
293         return ipv6_addr_equal(&ip1->ip[0].in6, &ip2->ip[0].in6) &&
294                ipv6_addr_equal(&ip1->ip[1].in6, &ip2->ip[1].in6) &&
295                ip1->ccmp == ip2->ccmp;
296 }
297 
298 static inline int
299 hash_netnet6_do_data_match(const struct hash_netnet6_elem *elem)
300 {
301         return elem->nomatch ? -ENOTEMPTY : 1;
302 }
303 
304 static inline void
305 hash_netnet6_data_set_flags(struct hash_netnet6_elem *elem, u32 flags)
306 {
307         elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
308 }
309 
310 static inline void
311 hash_netnet6_data_reset_flags(struct hash_netnet6_elem *elem, u8 *flags)
312 {
313         swap(*flags, elem->nomatch);
314 }
315 
316 static inline void
317 hash_netnet6_data_reset_elem(struct hash_netnet6_elem *elem,
318                              struct hash_netnet6_elem *orig)
319 {
320         elem->ip[1] = orig->ip[1];
321 }
322 
323 static inline void
324 hash_netnet6_data_netmask(struct hash_netnet6_elem *elem, u8 cidr, bool inner)
325 {
326         if (inner) {
327                 ip6_netmask(&elem->ip[1], cidr);
328                 elem->cidr[1] = cidr;
329         } else {
330                 ip6_netmask(&elem->ip[0], cidr);
331                 elem->cidr[0] = cidr;
332         }
333 }
334 
335 static bool
336 hash_netnet6_data_list(struct sk_buff *skb,
337                        const struct hash_netnet6_elem *data)
338 {
339         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
340 
341         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip[0].in6) ||
342             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip[1].in6) ||
343             nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr[0]) ||
344             nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr[1]) ||
345             (flags &&
346              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
347                 goto nla_put_failure;
348         return false;
349 
350 nla_put_failure:
351         return true;
352 }
353 
354 static inline void
355 hash_netnet6_data_next(struct hash_netnet6_elem *next,
356                        const struct hash_netnet6_elem *d)
357 {
358 }
359 
360 #undef MTYPE
361 #undef HOST_MASK
362 
363 #define MTYPE           hash_netnet6
364 #define HOST_MASK       128
365 #define IP_SET_EMIT_CREATE
366 #include "ip_set_hash_gen.h"
367 
368 static void
369 hash_netnet6_init(struct hash_netnet6_elem *e)
370 {
371         e->cidr[0] = HOST_MASK;
372         e->cidr[1] = HOST_MASK;
373 }
374 
375 static int
376 hash_netnet6_kadt(struct ip_set *set, const struct sk_buff *skb,
377                   const struct xt_action_param *par,
378                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
379 {
380         const struct hash_netnet6 *h = set->data;
381         ipset_adtfn adtfn = set->variant->adt[adt];
382         struct hash_netnet6_elem e = { };
383         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
384 
385         e.cidr[0] = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK);
386         e.cidr[1] = INIT_CIDR(h->nets[0].cidr[1], HOST_MASK);
387         if (adt == IPSET_TEST)
388                 e.ccmp = (HOST_MASK << (sizeof(u8) * 8)) | HOST_MASK;
389 
390         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip[0].in6);
391         ip6addrptr(skb, opt->flags & IPSET_DIM_TWO_SRC, &e.ip[1].in6);
392         ip6_netmask(&e.ip[0], e.cidr[0]);
393         ip6_netmask(&e.ip[1], e.cidr[1]);
394 
395         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
396 }
397 
398 static int
399 hash_netnet6_uadt(struct ip_set *set, struct nlattr *tb[],
400                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
401 {
402         ipset_adtfn adtfn = set->variant->adt[adt];
403         struct hash_netnet6_elem e = { };
404         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
405         int ret;
406 
407         if (tb[IPSET_ATTR_LINENO])
408                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
409 
410         hash_netnet6_init(&e);
411         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
412                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
413                 return -IPSET_ERR_PROTOCOL;
414         if (unlikely(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_IP2_TO]))
415                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
416 
417         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip[0]);
418         if (ret)
419                 return ret;
420 
421         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip[1]);
422         if (ret)
423                 return ret;
424 
425         ret = ip_set_get_extensions(set, tb, &ext);
426         if (ret)
427                 return ret;
428 
429         if (tb[IPSET_ATTR_CIDR]) {
430                 e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
431                 if (!e.cidr[0] || e.cidr[0] > HOST_MASK)
432                         return -IPSET_ERR_INVALID_CIDR;
433         }
434 
435         if (tb[IPSET_ATTR_CIDR2]) {
436                 e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
437                 if (!e.cidr[1] || e.cidr[1] > HOST_MASK)
438                         return -IPSET_ERR_INVALID_CIDR;
439         }
440 
441         ip6_netmask(&e.ip[0], e.cidr[0]);
442         ip6_netmask(&e.ip[1], e.cidr[1]);
443 
444         if (tb[IPSET_ATTR_CADT_FLAGS]) {
445                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
446 
447                 if (cadt_flags & IPSET_FLAG_NOMATCH)
448                         flags |= (IPSET_FLAG_NOMATCH << 16);
449         }
450 
451         ret = adtfn(set, &e, &ext, &ext, flags);
452 
453         return ip_set_enomatch(ret, flags, adt, set) ? -ret :
454                ip_set_eexist(ret, flags) ? 0 : ret;
455 }
456 
457 static struct ip_set_type hash_netnet_type __read_mostly = {
458         .name           = "hash:net,net",
459         .protocol       = IPSET_PROTOCOL,
460         .features       = IPSET_TYPE_IP | IPSET_TYPE_IP2 | 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_netnet_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_TIMEOUT]    = { .type = NLA_U32 },
472                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
473         },
474         .adt_policy     = {
475                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
476                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
477                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
478                 [IPSET_ATTR_IP2_TO]     = { .type = NLA_NESTED },
479                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
480                 [IPSET_ATTR_CIDR2]      = { .type = NLA_U8 },
481                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
482                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
483                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
484                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
485                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
486                                             .len  = IPSET_MAX_COMMENT_SIZE },
487                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
488                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
489                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
490         },
491         .me             = THIS_MODULE,
492 };
493 
494 static int __init
495 hash_netnet_init(void)
496 {
497         return ip_set_type_register(&hash_netnet_type);
498 }
499 
500 static void __exit
501 hash_netnet_fini(void)
502 {
503         rcu_barrier();
504         ip_set_type_unregister(&hash_netnet_type);
505 }
506 
507 module_init(hash_netnet_init);
508 module_exit(hash_netnet_fini);
509 

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