1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
3
4 /* Kernel module implementing an IP set type: the hash:ip,mark type */
5
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 #include <net/tcp.h>
16
17 #include <linux/netfilter.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 /* 1 Forceadd support */
24 /* 2 skbinfo support */
25 #define IPSET_TYPE_REV_MAX 3 /* bucketsize, initval support */
26
27 MODULE_LICENSE("GPL");
28 MODULE_AUTHOR("Vytas Dauksa <vytas.dauksa@smoothwall.net>");
29 IP_SET_MODULE_DESC("hash:ip,mark", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
30 MODULE_ALIAS("ip_set_hash:ip,mark");
31
32 /* Type specific function prefix */
33 #define HTYPE hash_ipmark
34 #define IP_SET_HASH_WITH_MARKMASK
35
36 /* IPv4 variant */
37
38 /* Member elements */
39 struct hash_ipmark4_elem {
40 __be32 ip;
41 __u32 mark;
42 };
43
44 /* Common functions */
45
46 static bool
hash_ipmark4_data_equal(const struct hash_ipmark4_elem * ip1,const struct hash_ipmark4_elem * ip2,u32 * multi)47 hash_ipmark4_data_equal(const struct hash_ipmark4_elem *ip1,
48 const struct hash_ipmark4_elem *ip2,
49 u32 *multi)
50 {
51 return ip1->ip == ip2->ip &&
52 ip1->mark == ip2->mark;
53 }
54
55 static bool
hash_ipmark4_data_list(struct sk_buff * skb,const struct hash_ipmark4_elem * data)56 hash_ipmark4_data_list(struct sk_buff *skb,
57 const struct hash_ipmark4_elem *data)
58 {
59 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
60 nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
61 goto nla_put_failure;
62 return false;
63
64 nla_put_failure:
65 return true;
66 }
67
68 static void
hash_ipmark4_data_next(struct hash_ipmark4_elem * next,const struct hash_ipmark4_elem * d)69 hash_ipmark4_data_next(struct hash_ipmark4_elem *next,
70 const struct hash_ipmark4_elem *d)
71 {
72 next->ip = d->ip;
73 }
74
75 #define MTYPE hash_ipmark4
76 #define HOST_MASK 32
77 #include "ip_set_hash_gen.h"
78
79 static int
hash_ipmark4_kadt(struct ip_set * set,const struct sk_buff * skb,const struct xt_action_param * par,enum ipset_adt adt,struct ip_set_adt_opt * opt)80 hash_ipmark4_kadt(struct ip_set *set, const struct sk_buff *skb,
81 const struct xt_action_param *par,
82 enum ipset_adt adt, struct ip_set_adt_opt *opt)
83 {
84 const struct hash_ipmark4 *h = set->data;
85 ipset_adtfn adtfn = set->variant->adt[adt];
86 struct hash_ipmark4_elem e = { };
87 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
88
89 e.mark = skb->mark;
90 e.mark &= h->markmask;
91
92 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
93 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
94 }
95
96 static int
hash_ipmark4_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)97 hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
98 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
99 {
100 const struct hash_ipmark4 *h = set->data;
101 ipset_adtfn adtfn = set->variant->adt[adt];
102 struct hash_ipmark4_elem e = { };
103 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
104 u32 ip, ip_to = 0;
105 int ret;
106
107 if (tb[IPSET_ATTR_LINENO])
108 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
109
110 if (unlikely(!tb[IPSET_ATTR_IP] ||
111 !ip_set_attr_netorder(tb, IPSET_ATTR_MARK)))
112 return -IPSET_ERR_PROTOCOL;
113
114 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
115 if (ret)
116 return ret;
117
118 ret = ip_set_get_extensions(set, tb, &ext);
119 if (ret)
120 return ret;
121
122 e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK]));
123 e.mark &= h->markmask;
124 if (e.mark == 0 && e.ip == 0)
125 return -IPSET_ERR_HASH_ELEM;
126
127 if (adt == IPSET_TEST ||
128 !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR])) {
129 ret = adtfn(set, &e, &ext, &ext, flags);
130 return ip_set_eexist(ret, flags) ? 0 : ret;
131 }
132
133 ip_to = ip = ntohl(e.ip);
134 if (tb[IPSET_ATTR_IP_TO]) {
135 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
136 if (ret)
137 return ret;
138 if (ip > ip_to) {
139 if (e.mark == 0 && ip_to == 0)
140 return -IPSET_ERR_HASH_ELEM;
141 swap(ip, ip_to);
142 }
143 } else if (tb[IPSET_ATTR_CIDR]) {
144 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
145
146 if (!cidr || cidr > HOST_MASK)
147 return -IPSET_ERR_INVALID_CIDR;
148 ip_set_mask_from_to(ip, ip_to, cidr);
149 }
150
151 if (((u64)ip_to - ip + 1) > IPSET_MAX_RANGE)
152 return -ERANGE;
153
154 if (retried)
155 ip = ntohl(h->next.ip);
156 for (; ip <= ip_to; ip++) {
157 e.ip = htonl(ip);
158 ret = adtfn(set, &e, &ext, &ext, flags);
159
160 if (ret && !ip_set_eexist(ret, flags))
161 return ret;
162
163 ret = 0;
164 }
165 return ret;
166 }
167
168 /* IPv6 variant */
169
170 struct hash_ipmark6_elem {
171 union nf_inet_addr ip;
172 __u32 mark;
173 };
174
175 /* Common functions */
176
177 static bool
hash_ipmark6_data_equal(const struct hash_ipmark6_elem * ip1,const struct hash_ipmark6_elem * ip2,u32 * multi)178 hash_ipmark6_data_equal(const struct hash_ipmark6_elem *ip1,
179 const struct hash_ipmark6_elem *ip2,
180 u32 *multi)
181 {
182 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
183 ip1->mark == ip2->mark;
184 }
185
186 static bool
hash_ipmark6_data_list(struct sk_buff * skb,const struct hash_ipmark6_elem * data)187 hash_ipmark6_data_list(struct sk_buff *skb,
188 const struct hash_ipmark6_elem *data)
189 {
190 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
191 nla_put_net32(skb, IPSET_ATTR_MARK, htonl(data->mark)))
192 goto nla_put_failure;
193 return false;
194
195 nla_put_failure:
196 return true;
197 }
198
199 static void
hash_ipmark6_data_next(struct hash_ipmark6_elem * next,const struct hash_ipmark6_elem * d)200 hash_ipmark6_data_next(struct hash_ipmark6_elem *next,
201 const struct hash_ipmark6_elem *d)
202 {
203 }
204
205 #undef MTYPE
206 #undef HOST_MASK
207
208 #define MTYPE hash_ipmark6
209 #define HOST_MASK 128
210 #define IP_SET_EMIT_CREATE
211 #include "ip_set_hash_gen.h"
212
213 static int
hash_ipmark6_kadt(struct ip_set * set,const struct sk_buff * skb,const struct xt_action_param * par,enum ipset_adt adt,struct ip_set_adt_opt * opt)214 hash_ipmark6_kadt(struct ip_set *set, const struct sk_buff *skb,
215 const struct xt_action_param *par,
216 enum ipset_adt adt, struct ip_set_adt_opt *opt)
217 {
218 const struct hash_ipmark6 *h = set->data;
219 ipset_adtfn adtfn = set->variant->adt[adt];
220 struct hash_ipmark6_elem e = { };
221 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
222
223 e.mark = skb->mark;
224 e.mark &= h->markmask;
225
226 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
227 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
228 }
229
230 static int
hash_ipmark6_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)231 hash_ipmark6_uadt(struct ip_set *set, struct nlattr *tb[],
232 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
233 {
234 const struct hash_ipmark6 *h = set->data;
235 ipset_adtfn adtfn = set->variant->adt[adt];
236 struct hash_ipmark6_elem e = { };
237 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
238 int ret;
239
240 if (tb[IPSET_ATTR_LINENO])
241 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
242
243 if (unlikely(!tb[IPSET_ATTR_IP] ||
244 !ip_set_attr_netorder(tb, IPSET_ATTR_MARK)))
245 return -IPSET_ERR_PROTOCOL;
246 if (unlikely(tb[IPSET_ATTR_IP_TO]))
247 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
248 if (unlikely(tb[IPSET_ATTR_CIDR])) {
249 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
250
251 if (cidr != HOST_MASK)
252 return -IPSET_ERR_INVALID_CIDR;
253 }
254
255 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
256 if (ret)
257 return ret;
258
259 ret = ip_set_get_extensions(set, tb, &ext);
260 if (ret)
261 return ret;
262
263 e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK]));
264 e.mark &= h->markmask;
265
266 if (adt == IPSET_TEST) {
267 ret = adtfn(set, &e, &ext, &ext, flags);
268 return ip_set_eexist(ret, flags) ? 0 : ret;
269 }
270
271 ret = adtfn(set, &e, &ext, &ext, flags);
272 if (ret && !ip_set_eexist(ret, flags))
273 return ret;
274
275 return 0;
276 }
277
278 static struct ip_set_type hash_ipmark_type __read_mostly = {
279 .name = "hash:ip,mark",
280 .protocol = IPSET_PROTOCOL,
281 .features = IPSET_TYPE_IP | IPSET_TYPE_MARK,
282 .dimension = IPSET_DIM_TWO,
283 .family = NFPROTO_UNSPEC,
284 .revision_min = IPSET_TYPE_REV_MIN,
285 .revision_max = IPSET_TYPE_REV_MAX,
286 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
287 .create = hash_ipmark_create,
288 .create_policy = {
289 [IPSET_ATTR_MARKMASK] = { .type = NLA_U32 },
290 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
291 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
292 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
293 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
294 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
295 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
296 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
297 },
298 .adt_policy = {
299 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
300 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
301 [IPSET_ATTR_MARK] = { .type = NLA_U32 },
302 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
303 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
304 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
305 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
306 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
307 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
308 .len = IPSET_MAX_COMMENT_SIZE },
309 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
310 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
311 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
312 },
313 .me = THIS_MODULE,
314 };
315
316 static int __init
hash_ipmark_init(void)317 hash_ipmark_init(void)
318 {
319 return ip_set_type_register(&hash_ipmark_type);
320 }
321
322 static void __exit
hash_ipmark_fini(void)323 hash_ipmark_fini(void)
324 {
325 rcu_barrier();
326 ip_set_type_unregister(&hash_ipmark_type);
327 }
328
329 module_init(hash_ipmark_init);
330 module_exit(hash_ipmark_fini);
331
