1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
4 /* Kernel module implementing an IP set type: the hash:net type */
6 #include <linux/jhash.h>
7 #include <linux/module.h>
9 #include <linux/skbuff.h>
10 #include <linux/errno.h>
11 #include <linux/random.h>
14 #include <net/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/ipset/pfxlen.h>
18 #include <linux/netfilter/ipset/ip_set.h>
19 #include <linux/netfilter/ipset/ip_set_hash.h>
21 #define IPSET_TYPE_REV_MIN 0
22 /* 1 Range as input support for IPv4 added */
23 /* 2 nomatch flag support added */
24 /* 3 Counters support added */
25 /* 4 Comments support added */
26 /* 5 Forceadd support added */
27 /* 6 skbinfo support added */
28 #define IPSET_TYPE_REV_MAX 7 /* bucketsize, initval support added */
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
32 IP_SET_MODULE_DESC("hash:net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
33 MODULE_ALIAS("ip_set_hash:net");
35 /* Type specific function prefix */
36 #define HTYPE hash_net
37 #define IP_SET_HASH_WITH_NETS
42 struct hash_net4_elem {
49 /* Common functions */
52 hash_net4_data_equal(const struct hash_net4_elem *ip1,
53 const struct hash_net4_elem *ip2,
56 return ip1->ip == ip2->ip &&
57 ip1->cidr == ip2->cidr;
61 hash_net4_do_data_match(const struct hash_net4_elem *elem)
63 return elem->nomatch ? -ENOTEMPTY : 1;
67 hash_net4_data_set_flags(struct hash_net4_elem *elem, u32 flags)
69 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
73 hash_net4_data_reset_flags(struct hash_net4_elem *elem, u8 *flags)
75 swap(*flags, elem->nomatch);
79 hash_net4_data_netmask(struct hash_net4_elem *elem, u8 cidr)
81 elem->ip &= ip_set_netmask(cidr);
86 hash_net4_data_list(struct sk_buff *skb, const struct hash_net4_elem *data)
88 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
90 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
91 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
93 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
102 hash_net4_data_next(struct hash_net4_elem *next,
103 const struct hash_net4_elem *d)
108 #define MTYPE hash_net4
110 #include "ip_set_hash_gen.h"
113 hash_net4_kadt(struct ip_set *set, const struct sk_buff *skb,
114 const struct xt_action_param *par,
115 enum ipset_adt adt, struct ip_set_adt_opt *opt)
117 const struct hash_net4 *h = set->data;
118 ipset_adtfn adtfn = set->variant->adt[adt];
119 struct hash_net4_elem e = {
120 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
122 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
126 if (adt == IPSET_TEST)
129 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
130 e.ip &= ip_set_netmask(e.cidr);
132 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
136 hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
137 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
139 struct hash_net4 *h = set->data;
140 ipset_adtfn adtfn = set->variant->adt[adt];
141 struct hash_net4_elem e = { .cidr = HOST_MASK };
142 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
143 u32 ip = 0, ip_to = 0, i = 0;
146 if (tb[IPSET_ATTR_LINENO])
147 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
149 if (unlikely(!tb[IPSET_ATTR_IP] ||
150 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
151 return -IPSET_ERR_PROTOCOL;
153 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
157 ret = ip_set_get_extensions(set, tb, &ext);
161 if (tb[IPSET_ATTR_CIDR]) {
162 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
163 if (!e.cidr || e.cidr > HOST_MASK)
164 return -IPSET_ERR_INVALID_CIDR;
167 if (tb[IPSET_ATTR_CADT_FLAGS]) {
168 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
170 if (cadt_flags & IPSET_FLAG_NOMATCH)
171 flags |= (IPSET_FLAG_NOMATCH << 16);
174 if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
175 e.ip = htonl(ip & ip_set_hostmask(e.cidr));
176 ret = adtfn(set, &e, &ext, &ext, flags);
177 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
178 ip_set_eexist(ret, flags) ? 0 : ret;
182 if (tb[IPSET_ATTR_IP_TO]) {
183 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
188 if (ip + UINT_MAX == ip_to)
189 return -IPSET_ERR_HASH_RANGE;
193 ip = ntohl(h->next.ip);
197 if (i > IPSET_MAX_RANGE) {
198 hash_net4_data_next(&h->next, &e);
201 ip = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
202 ret = adtfn(set, &e, &ext, &ext, flags);
203 if (ret && !ip_set_eexist(ret, flags))
207 } while (ip++ < ip_to);
213 struct hash_net6_elem {
214 union nf_inet_addr ip;
220 /* Common functions */
223 hash_net6_data_equal(const struct hash_net6_elem *ip1,
224 const struct hash_net6_elem *ip2,
227 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
228 ip1->cidr == ip2->cidr;
232 hash_net6_do_data_match(const struct hash_net6_elem *elem)
234 return elem->nomatch ? -ENOTEMPTY : 1;
238 hash_net6_data_set_flags(struct hash_net6_elem *elem, u32 flags)
240 elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
244 hash_net6_data_reset_flags(struct hash_net6_elem *elem, u8 *flags)
246 swap(*flags, elem->nomatch);
250 hash_net6_data_netmask(struct hash_net6_elem *elem, u8 cidr)
252 ip6_netmask(&elem->ip, cidr);
257 hash_net6_data_list(struct sk_buff *skb, const struct hash_net6_elem *data)
259 u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
261 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
262 nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
264 nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
265 goto nla_put_failure;
273 hash_net6_data_next(struct hash_net6_elem *next,
274 const struct hash_net6_elem *d)
281 #define MTYPE hash_net6
282 #define HOST_MASK 128
283 #define IP_SET_EMIT_CREATE
284 #include "ip_set_hash_gen.h"
287 hash_net6_kadt(struct ip_set *set, const struct sk_buff *skb,
288 const struct xt_action_param *par,
289 enum ipset_adt adt, struct ip_set_adt_opt *opt)
291 const struct hash_net6 *h = set->data;
292 ipset_adtfn adtfn = set->variant->adt[adt];
293 struct hash_net6_elem e = {
294 .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
296 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
300 if (adt == IPSET_TEST)
303 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
304 ip6_netmask(&e.ip, e.cidr);
306 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
310 hash_net6_uadt(struct ip_set *set, struct nlattr *tb[],
311 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
313 ipset_adtfn adtfn = set->variant->adt[adt];
314 struct hash_net6_elem e = { .cidr = HOST_MASK };
315 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
318 if (tb[IPSET_ATTR_LINENO])
319 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
321 if (unlikely(!tb[IPSET_ATTR_IP] ||
322 !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
323 return -IPSET_ERR_PROTOCOL;
324 if (unlikely(tb[IPSET_ATTR_IP_TO]))
325 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
327 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
331 ret = ip_set_get_extensions(set, tb, &ext);
335 if (tb[IPSET_ATTR_CIDR]) {
336 e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
337 if (!e.cidr || e.cidr > HOST_MASK)
338 return -IPSET_ERR_INVALID_CIDR;
341 ip6_netmask(&e.ip, e.cidr);
343 if (tb[IPSET_ATTR_CADT_FLAGS]) {
344 u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
346 if (cadt_flags & IPSET_FLAG_NOMATCH)
347 flags |= (IPSET_FLAG_NOMATCH << 16);
350 ret = adtfn(set, &e, &ext, &ext, flags);
352 return ip_set_enomatch(ret, flags, adt, set) ? -ret :
353 ip_set_eexist(ret, flags) ? 0 : ret;
356 static struct ip_set_type hash_net_type __read_mostly = {
358 .protocol = IPSET_PROTOCOL,
359 .features = IPSET_TYPE_IP | IPSET_TYPE_NOMATCH,
360 .dimension = IPSET_DIM_ONE,
361 .family = NFPROTO_UNSPEC,
362 .revision_min = IPSET_TYPE_REV_MIN,
363 .revision_max = IPSET_TYPE_REV_MAX,
364 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
365 .create = hash_net_create,
367 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
368 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
369 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
370 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
371 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
372 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
373 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
376 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
377 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
378 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
379 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
380 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
381 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
382 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
383 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
384 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
385 .len = IPSET_MAX_COMMENT_SIZE },
386 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
387 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
388 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
396 return ip_set_type_register(&hash_net_type);
403 ip_set_type_unregister(&hash_net_type);
406 module_init(hash_net_init);
407 module_exit(hash_net_fini);