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Linux/net/netfilter/ipset/ip_set_hash_ipportnet.c

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  1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  2  *
  3  * This program is free software; you can redistribute it and/or modify
  4  * it under the terms of the GNU General Public License version 2 as
  5  * published by the Free Software Foundation.
  6  */
  7 
  8 /* Kernel module implementing an IP set type: the hash:ip,port,net type */
  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 #include <net/tcp.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_getport.h>
 25 #include <linux/netfilter/ipset/ip_set_hash.h>
 26 
 27 #define IPSET_TYPE_REV_MIN      0
 28 /*                              1    SCTP and UDPLITE support added */
 29 /*                              2    Range as input support for IPv4 added */
 30 /*                              3    nomatch flag support added */
 31 /*                              4    Counters support added */
 32 /*                              5    Comments support added */
 33 /*                              6    Forceadd support added */
 34 #define IPSET_TYPE_REV_MAX      7 /* skbinfo support added */
 35 
 36 MODULE_LICENSE("GPL");
 37 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
 38 IP_SET_MODULE_DESC("hash:ip,port,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 39 MODULE_ALIAS("ip_set_hash:ip,port,net");
 40 
 41 /* Type specific function prefix */
 42 #define HTYPE           hash_ipportnet
 43 
 44 /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
 45  * However this way we have to store internally cidr - 1,
 46  * dancing back and forth.
 47  */
 48 #define IP_SET_HASH_WITH_NETS_PACKED
 49 #define IP_SET_HASH_WITH_PROTO
 50 #define IP_SET_HASH_WITH_NETS
 51 
 52 /* IPv4 variant */
 53 
 54 /* Member elements */
 55 struct hash_ipportnet4_elem {
 56         __be32 ip;
 57         __be32 ip2;
 58         __be16 port;
 59         u8 cidr:7;
 60         u8 nomatch:1;
 61         u8 proto;
 62 };
 63 
 64 /* Common functions */
 65 
 66 static inline bool
 67 hash_ipportnet4_data_equal(const struct hash_ipportnet4_elem *ip1,
 68                            const struct hash_ipportnet4_elem *ip2,
 69                            u32 *multi)
 70 {
 71         return ip1->ip == ip2->ip &&
 72                ip1->ip2 == ip2->ip2 &&
 73                ip1->cidr == ip2->cidr &&
 74                ip1->port == ip2->port &&
 75                ip1->proto == ip2->proto;
 76 }
 77 
 78 static inline int
 79 hash_ipportnet4_do_data_match(const struct hash_ipportnet4_elem *elem)
 80 {
 81         return elem->nomatch ? -ENOTEMPTY : 1;
 82 }
 83 
 84 static inline void
 85 hash_ipportnet4_data_set_flags(struct hash_ipportnet4_elem *elem, u32 flags)
 86 {
 87         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
 88 }
 89 
 90 static inline void
 91 hash_ipportnet4_data_reset_flags(struct hash_ipportnet4_elem *elem, u8 *flags)
 92 {
 93         swap(*flags, elem->nomatch);
 94 }
 95 
 96 static inline void
 97 hash_ipportnet4_data_netmask(struct hash_ipportnet4_elem *elem, u8 cidr)
 98 {
 99         elem->ip2 &= ip_set_netmask(cidr);
100         elem->cidr = cidr - 1;
101 }
102 
103 static bool
104 hash_ipportnet4_data_list(struct sk_buff *skb,
105                           const struct hash_ipportnet4_elem *data)
106 {
107         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
108 
109         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
110             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
111             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
112             nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr + 1) ||
113             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
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_ipportnet4_data_next(struct hash_ipportnet4_elem *next,
125                           const struct hash_ipportnet4_elem *d)
126 {
127         next->ip = d->ip;
128         next->port = d->port;
129         next->ip2 = d->ip2;
130 }
131 
132 #define MTYPE           hash_ipportnet4
133 #define HOST_MASK       32
134 #include "ip_set_hash_gen.h"
135 
136 static int
137 hash_ipportnet4_kadt(struct ip_set *set, const struct sk_buff *skb,
138                      const struct xt_action_param *par,
139                      enum ipset_adt adt, struct ip_set_adt_opt *opt)
140 {
141         const struct hash_ipportnet4 *h = set->data;
142         ipset_adtfn adtfn = set->variant->adt[adt];
143         struct hash_ipportnet4_elem e = {
144                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
145         };
146         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
147 
148         if (adt == IPSET_TEST)
149                 e.cidr = HOST_MASK - 1;
150 
151         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
152                                  &e.port, &e.proto))
153                 return -EINVAL;
154 
155         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
156         ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
157         e.ip2 &= ip_set_netmask(e.cidr + 1);
158 
159         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
160 }
161 
162 static int
163 hash_ipportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
164                      enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
165 {
166         const struct hash_ipportnet4 *h = set->data;
167         ipset_adtfn adtfn = set->variant->adt[adt];
168         struct hash_ipportnet4_elem e = { .cidr = HOST_MASK - 1 };
169         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
170         u32 ip = 0, ip_to = 0, p = 0, port, port_to;
171         u32 ip2_from = 0, ip2_to = 0, ip2;
172         bool with_ports = false;
173         u8 cidr;
174         int ret;
175 
176         if (tb[IPSET_ATTR_LINENO])
177                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
178 
179         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
180                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
181                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
182                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
183                 return -IPSET_ERR_PROTOCOL;
184 
185         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
186         if (ret)
187                 return ret;
188 
189         ret = ip_set_get_extensions(set, tb, &ext);
190         if (ret)
191                 return ret;
192 
193         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from);
194         if (ret)
195                 return ret;
196 
197         if (tb[IPSET_ATTR_CIDR2]) {
198                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
199                 if (!cidr || cidr > HOST_MASK)
200                         return -IPSET_ERR_INVALID_CIDR;
201                 e.cidr = cidr - 1;
202         }
203 
204         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
205 
206         if (tb[IPSET_ATTR_PROTO]) {
207                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
208                 with_ports = ip_set_proto_with_ports(e.proto);
209 
210                 if (e.proto == 0)
211                         return -IPSET_ERR_INVALID_PROTO;
212         } else {
213                 return -IPSET_ERR_MISSING_PROTO;
214         }
215 
216         if (!(with_ports || e.proto == IPPROTO_ICMP))
217                 e.port = 0;
218 
219         if (tb[IPSET_ATTR_CADT_FLAGS]) {
220                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
221 
222                 if (cadt_flags & IPSET_FLAG_NOMATCH)
223                         flags |= (IPSET_FLAG_NOMATCH << 16);
224         }
225 
226         with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
227         if (adt == IPSET_TEST ||
228             !(tb[IPSET_ATTR_CIDR] || tb[IPSET_ATTR_IP_TO] || with_ports ||
229               tb[IPSET_ATTR_IP2_TO])) {
230                 e.ip = htonl(ip);
231                 e.ip2 = htonl(ip2_from & ip_set_hostmask(e.cidr + 1));
232                 ret = adtfn(set, &e, &ext, &ext, flags);
233                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
234                        ip_set_eexist(ret, flags) ? 0 : ret;
235         }
236 
237         ip_to = ip;
238         if (tb[IPSET_ATTR_IP_TO]) {
239                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
240                 if (ret)
241                         return ret;
242                 if (ip > ip_to)
243                         swap(ip, ip_to);
244         } else if (tb[IPSET_ATTR_CIDR]) {
245                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
246 
247                 if (!cidr || cidr > HOST_MASK)
248                         return -IPSET_ERR_INVALID_CIDR;
249                 ip_set_mask_from_to(ip, ip_to, cidr);
250         }
251 
252         port_to = port = ntohs(e.port);
253         if (tb[IPSET_ATTR_PORT_TO]) {
254                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
255                 if (port > port_to)
256                         swap(port, port_to);
257         }
258 
259         ip2_to = ip2_from;
260         if (tb[IPSET_ATTR_IP2_TO]) {
261                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
262                 if (ret)
263                         return ret;
264                 if (ip2_from > ip2_to)
265                         swap(ip2_from, ip2_to);
266                 if (ip2_from + UINT_MAX == ip2_to)
267                         return -IPSET_ERR_HASH_RANGE;
268         } else {
269                 ip_set_mask_from_to(ip2_from, ip2_to, e.cidr + 1);
270         }
271 
272         if (retried) {
273                 ip = ntohl(h->next.ip);
274                 p = ntohs(h->next.port);
275                 ip2 = ntohl(h->next.ip2);
276         } else {
277                 p = port;
278                 ip2 = ip2_from;
279         }
280         for (; ip <= ip_to; ip++) {
281                 e.ip = htonl(ip);
282                 for (; p <= port_to; p++) {
283                         e.port = htons(p);
284                         do {
285                                 e.ip2 = htonl(ip2);
286                                 ip2 = ip_set_range_to_cidr(ip2, ip2_to, &cidr);
287                                 e.cidr = cidr - 1;
288                                 ret = adtfn(set, &e, &ext, &ext, flags);
289 
290                                 if (ret && !ip_set_eexist(ret, flags))
291                                         return ret;
292 
293                                 ret = 0;
294                         } while (ip2++ < ip2_to);
295                         ip2 = ip2_from;
296                 }
297                 p = port;
298         }
299         return ret;
300 }
301 
302 /* IPv6 variant */
303 
304 struct hash_ipportnet6_elem {
305         union nf_inet_addr ip;
306         union nf_inet_addr ip2;
307         __be16 port;
308         u8 cidr:7;
309         u8 nomatch:1;
310         u8 proto;
311 };
312 
313 /* Common functions */
314 
315 static inline bool
316 hash_ipportnet6_data_equal(const struct hash_ipportnet6_elem *ip1,
317                            const struct hash_ipportnet6_elem *ip2,
318                            u32 *multi)
319 {
320         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
321                ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
322                ip1->cidr == ip2->cidr &&
323                ip1->port == ip2->port &&
324                ip1->proto == ip2->proto;
325 }
326 
327 static inline int
328 hash_ipportnet6_do_data_match(const struct hash_ipportnet6_elem *elem)
329 {
330         return elem->nomatch ? -ENOTEMPTY : 1;
331 }
332 
333 static inline void
334 hash_ipportnet6_data_set_flags(struct hash_ipportnet6_elem *elem, u32 flags)
335 {
336         elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
337 }
338 
339 static inline void
340 hash_ipportnet6_data_reset_flags(struct hash_ipportnet6_elem *elem, u8 *flags)
341 {
342         swap(*flags, elem->nomatch);
343 }
344 
345 static inline void
346 hash_ipportnet6_data_netmask(struct hash_ipportnet6_elem *elem, u8 cidr)
347 {
348         ip6_netmask(&elem->ip2, cidr);
349         elem->cidr = cidr - 1;
350 }
351 
352 static bool
353 hash_ipportnet6_data_list(struct sk_buff *skb,
354                           const struct hash_ipportnet6_elem *data)
355 {
356         u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
357 
358         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
359             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
360             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
361             nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr + 1) ||
362             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
363             (flags &&
364              nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
365                 goto nla_put_failure;
366         return false;
367 
368 nla_put_failure:
369         return true;
370 }
371 
372 static inline void
373 hash_ipportnet6_data_next(struct hash_ipportnet6_elem *next,
374                           const struct hash_ipportnet6_elem *d)
375 {
376         next->port = d->port;
377 }
378 
379 #undef MTYPE
380 #undef HOST_MASK
381 
382 #define MTYPE           hash_ipportnet6
383 #define HOST_MASK       128
384 #define IP_SET_EMIT_CREATE
385 #include "ip_set_hash_gen.h"
386 
387 static int
388 hash_ipportnet6_kadt(struct ip_set *set, const struct sk_buff *skb,
389                      const struct xt_action_param *par,
390                      enum ipset_adt adt, struct ip_set_adt_opt *opt)
391 {
392         const struct hash_ipportnet6 *h = set->data;
393         ipset_adtfn adtfn = set->variant->adt[adt];
394         struct hash_ipportnet6_elem e = {
395                 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
396         };
397         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
398 
399         if (adt == IPSET_TEST)
400                 e.cidr = HOST_MASK - 1;
401 
402         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
403                                  &e.port, &e.proto))
404                 return -EINVAL;
405 
406         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
407         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
408         ip6_netmask(&e.ip2, e.cidr + 1);
409 
410         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
411 }
412 
413 static int
414 hash_ipportnet6_uadt(struct ip_set *set, struct nlattr *tb[],
415                      enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
416 {
417         const struct hash_ipportnet6 *h = set->data;
418         ipset_adtfn adtfn = set->variant->adt[adt];
419         struct hash_ipportnet6_elem e = { .cidr = HOST_MASK - 1 };
420         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
421         u32 port, port_to;
422         bool with_ports = false;
423         u8 cidr;
424         int ret;
425 
426         if (tb[IPSET_ATTR_LINENO])
427                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
428 
429         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
430                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
431                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
432                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
433                 return -IPSET_ERR_PROTOCOL;
434         if (unlikely(tb[IPSET_ATTR_IP_TO]))
435                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
436         if (unlikely(tb[IPSET_ATTR_CIDR])) {
437                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
438 
439                 if (cidr != HOST_MASK)
440                         return -IPSET_ERR_INVALID_CIDR;
441         }
442 
443         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
444         if (ret)
445                 return ret;
446 
447         ret = ip_set_get_extensions(set, tb, &ext);
448         if (ret)
449                 return ret;
450 
451         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
452         if (ret)
453                 return ret;
454 
455         if (tb[IPSET_ATTR_CIDR2]) {
456                 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
457                 if (!cidr || cidr > HOST_MASK)
458                         return -IPSET_ERR_INVALID_CIDR;
459                 e.cidr = cidr - 1;
460         }
461 
462         ip6_netmask(&e.ip2, e.cidr + 1);
463 
464         e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
465 
466         if (tb[IPSET_ATTR_PROTO]) {
467                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
468                 with_ports = ip_set_proto_with_ports(e.proto);
469 
470                 if (e.proto == 0)
471                         return -IPSET_ERR_INVALID_PROTO;
472         } else {
473                 return -IPSET_ERR_MISSING_PROTO;
474         }
475 
476         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
477                 e.port = 0;
478 
479         if (tb[IPSET_ATTR_CADT_FLAGS]) {
480                 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
481 
482                 if (cadt_flags & IPSET_FLAG_NOMATCH)
483                         flags |= (IPSET_FLAG_NOMATCH << 16);
484         }
485 
486         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
487                 ret = adtfn(set, &e, &ext, &ext, flags);
488                 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
489                        ip_set_eexist(ret, flags) ? 0 : ret;
490         }
491 
492         port = ntohs(e.port);
493         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
494         if (port > port_to)
495                 swap(port, port_to);
496 
497         if (retried)
498                 port = ntohs(h->next.port);
499         for (; port <= port_to; port++) {
500                 e.port = htons(port);
501                 ret = adtfn(set, &e, &ext, &ext, flags);
502 
503                 if (ret && !ip_set_eexist(ret, flags))
504                         return ret;
505 
506                 ret = 0;
507         }
508         return ret;
509 }
510 
511 static struct ip_set_type hash_ipportnet_type __read_mostly = {
512         .name           = "hash:ip,port,net",
513         .protocol       = IPSET_PROTOCOL,
514         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2 |
515                           IPSET_TYPE_NOMATCH,
516         .dimension      = IPSET_DIM_THREE,
517         .family         = NFPROTO_UNSPEC,
518         .revision_min   = IPSET_TYPE_REV_MIN,
519         .revision_max   = IPSET_TYPE_REV_MAX,
520         .create         = hash_ipportnet_create,
521         .create_policy  = {
522                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
523                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
524                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
525                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
526                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
527                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
528         },
529         .adt_policy     = {
530                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
531                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
532                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
533                 [IPSET_ATTR_IP2_TO]     = { .type = NLA_NESTED },
534                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
535                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
536                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
537                 [IPSET_ATTR_CIDR2]      = { .type = NLA_U8 },
538                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
539                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
540                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
541                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
542                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
543                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
544                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
545                                             .len  = IPSET_MAX_COMMENT_SIZE },
546                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
547                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
548                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
549         },
550         .me             = THIS_MODULE,
551 };
552 
553 static int __init
554 hash_ipportnet_init(void)
555 {
556         return ip_set_type_register(&hash_ipportnet_type);
557 }
558 
559 static void __exit
560 hash_ipportnet_fini(void)
561 {
562         rcu_barrier();
563         ip_set_type_unregister(&hash_ipportnet_type);
564 }
565 
566 module_init(hash_ipportnet_init);
567 module_exit(hash_ipportnet_fini);
568 

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