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 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 Counters support */ |
24 | /* 2 Comments support */ |
25 | /* 3 Forceadd support */ |
26 | /* 4 skbinfo support */ |
27 | /* 5 bucketsize, initval support */ |
28 | #define IPSET_TYPE_REV_MAX 6 /* bitmask support */ |
29 | |
30 | MODULE_LICENSE("GPL" ); |
31 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>" ); |
32 | IP_SET_MODULE_DESC("hash:ip" , IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); |
33 | MODULE_ALIAS("ip_set_hash:ip" ); |
34 | |
35 | /* Type specific function prefix */ |
36 | #define HTYPE hash_ip |
37 | #define IP_SET_HASH_WITH_NETMASK |
38 | #define IP_SET_HASH_WITH_BITMASK |
39 | |
40 | /* IPv4 variant */ |
41 | |
42 | /* Member elements */ |
43 | struct hash_ip4_elem { |
44 | /* Zero valued IP addresses cannot be stored */ |
45 | __be32 ip; |
46 | }; |
47 | |
48 | /* Common functions */ |
49 | |
50 | static bool |
51 | hash_ip4_data_equal(const struct hash_ip4_elem *e1, |
52 | const struct hash_ip4_elem *e2, |
53 | u32 *multi) |
54 | { |
55 | return e1->ip == e2->ip; |
56 | } |
57 | |
58 | static bool |
59 | hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e) |
60 | { |
61 | if (nla_put_ipaddr4(skb, type: IPSET_ATTR_IP, ipaddr: e->ip)) |
62 | goto nla_put_failure; |
63 | return false; |
64 | |
65 | nla_put_failure: |
66 | return true; |
67 | } |
68 | |
69 | static void |
70 | hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e) |
71 | { |
72 | next->ip = e->ip; |
73 | } |
74 | |
75 | #define MTYPE hash_ip4 |
76 | #define HOST_MASK 32 |
77 | #include "ip_set_hash_gen.h" |
78 | |
79 | static int |
80 | hash_ip4_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_ip4 *h = set->data; |
85 | ipset_adtfn adtfn = set->variant->adt[adt]; |
86 | struct hash_ip4_elem e = { 0 }; |
87 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
88 | __be32 ip; |
89 | |
90 | ip4addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &ip); |
91 | ip &= h->bitmask.ip; |
92 | if (ip == 0) |
93 | return -EINVAL; |
94 | |
95 | e.ip = ip; |
96 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
97 | } |
98 | |
99 | static int |
100 | hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[], |
101 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
102 | { |
103 | struct hash_ip4 *h = set->data; |
104 | ipset_adtfn adtfn = set->variant->adt[adt]; |
105 | struct hash_ip4_elem e = { 0 }; |
106 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
107 | u32 ip = 0, ip_to = 0, hosts, i = 0; |
108 | int ret = 0; |
109 | |
110 | if (tb[IPSET_ATTR_LINENO]) |
111 | *lineno = nla_get_u32(nla: tb[IPSET_ATTR_LINENO]); |
112 | |
113 | if (unlikely(!tb[IPSET_ATTR_IP])) |
114 | return -IPSET_ERR_PROTOCOL; |
115 | |
116 | ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP], ipaddr: &ip); |
117 | if (ret) |
118 | return ret; |
119 | |
120 | ret = ip_set_get_extensions(set, tb, ext: &ext); |
121 | if (ret) |
122 | return ret; |
123 | |
124 | ip &= ntohl(h->bitmask.ip); |
125 | e.ip = htonl(ip); |
126 | if (e.ip == 0) |
127 | return -IPSET_ERR_HASH_ELEM; |
128 | |
129 | if (adt == IPSET_TEST) |
130 | return adtfn(set, &e, &ext, &ext, flags); |
131 | |
132 | ip_to = ip; |
133 | if (tb[IPSET_ATTR_IP_TO]) { |
134 | ret = ip_set_get_hostipaddr4(nla: tb[IPSET_ATTR_IP_TO], ipaddr: &ip_to); |
135 | if (ret) |
136 | return ret; |
137 | if (ip > ip_to) { |
138 | if (ip_to == 0) |
139 | return -IPSET_ERR_HASH_ELEM; |
140 | swap(ip, ip_to); |
141 | } |
142 | } else if (tb[IPSET_ATTR_CIDR]) { |
143 | u8 cidr = nla_get_u8(nla: tb[IPSET_ATTR_CIDR]); |
144 | |
145 | if (!cidr || cidr > HOST_MASK) |
146 | return -IPSET_ERR_INVALID_CIDR; |
147 | ip_set_mask_from_to(ip, ip_to, cidr); |
148 | } |
149 | |
150 | hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1); |
151 | |
152 | if (retried) |
153 | ip = ntohl(h->next.ip); |
154 | for (; ip <= ip_to; i++) { |
155 | e.ip = htonl(ip); |
156 | if (i > IPSET_MAX_RANGE) { |
157 | hash_ip4_data_next(next: &h->next, e: &e); |
158 | return -ERANGE; |
159 | } |
160 | ret = adtfn(set, &e, &ext, &ext, flags); |
161 | if (ret && !ip_set_eexist(ret, flags)) |
162 | return ret; |
163 | |
164 | ip += hosts; |
165 | if (ip == 0) |
166 | return 0; |
167 | |
168 | ret = 0; |
169 | } |
170 | return ret; |
171 | } |
172 | |
173 | /* IPv6 variant */ |
174 | |
175 | /* Member elements */ |
176 | struct hash_ip6_elem { |
177 | union nf_inet_addr ip; |
178 | }; |
179 | |
180 | /* Common functions */ |
181 | |
182 | static bool |
183 | hash_ip6_data_equal(const struct hash_ip6_elem *ip1, |
184 | const struct hash_ip6_elem *ip2, |
185 | u32 *multi) |
186 | { |
187 | return ipv6_addr_equal(a1: &ip1->ip.in6, a2: &ip2->ip.in6); |
188 | } |
189 | |
190 | static bool |
191 | hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e) |
192 | { |
193 | if (nla_put_ipaddr6(skb, type: IPSET_ATTR_IP, ipaddrptr: &e->ip.in6)) |
194 | goto nla_put_failure; |
195 | return false; |
196 | |
197 | nla_put_failure: |
198 | return true; |
199 | } |
200 | |
201 | static void |
202 | hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e) |
203 | { |
204 | } |
205 | |
206 | #undef MTYPE |
207 | #undef HOST_MASK |
208 | |
209 | #define MTYPE hash_ip6 |
210 | #define HOST_MASK 128 |
211 | |
212 | #define IP_SET_EMIT_CREATE |
213 | #include "ip_set_hash_gen.h" |
214 | |
215 | static int |
216 | hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb, |
217 | const struct xt_action_param *par, |
218 | enum ipset_adt adt, struct ip_set_adt_opt *opt) |
219 | { |
220 | const struct hash_ip6 *h = set->data; |
221 | ipset_adtfn adtfn = set->variant->adt[adt]; |
222 | struct hash_ip6_elem e = { { .all = { 0 } } }; |
223 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); |
224 | |
225 | ip6addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &e.ip.in6); |
226 | nf_inet_addr_mask_inplace(a1: &e.ip, mask: &h->bitmask); |
227 | if (ipv6_addr_any(a: &e.ip.in6)) |
228 | return -EINVAL; |
229 | |
230 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); |
231 | } |
232 | |
233 | static int |
234 | hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[], |
235 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) |
236 | { |
237 | const struct hash_ip6 *h = set->data; |
238 | ipset_adtfn adtfn = set->variant->adt[adt]; |
239 | struct hash_ip6_elem e = { { .all = { 0 } } }; |
240 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); |
241 | int ret; |
242 | |
243 | if (tb[IPSET_ATTR_LINENO]) |
244 | *lineno = nla_get_u32(nla: tb[IPSET_ATTR_LINENO]); |
245 | |
246 | if (unlikely(!tb[IPSET_ATTR_IP])) |
247 | return -IPSET_ERR_PROTOCOL; |
248 | if (unlikely(tb[IPSET_ATTR_IP_TO])) |
249 | return -IPSET_ERR_HASH_RANGE_UNSUPPORTED; |
250 | if (unlikely(tb[IPSET_ATTR_CIDR])) { |
251 | u8 cidr = nla_get_u8(nla: tb[IPSET_ATTR_CIDR]); |
252 | |
253 | if (cidr != HOST_MASK) |
254 | return -IPSET_ERR_INVALID_CIDR; |
255 | } |
256 | |
257 | ret = ip_set_get_ipaddr6(nla: tb[IPSET_ATTR_IP], ipaddr: &e.ip); |
258 | if (ret) |
259 | return ret; |
260 | |
261 | ret = ip_set_get_extensions(set, tb, ext: &ext); |
262 | if (ret) |
263 | return ret; |
264 | |
265 | nf_inet_addr_mask_inplace(a1: &e.ip, mask: &h->bitmask); |
266 | if (ipv6_addr_any(a: &e.ip.in6)) |
267 | return -IPSET_ERR_HASH_ELEM; |
268 | |
269 | ret = adtfn(set, &e, &ext, &ext, flags); |
270 | |
271 | return ip_set_eexist(ret, flags) ? 0 : ret; |
272 | } |
273 | |
274 | static struct ip_set_type hash_ip_type __read_mostly = { |
275 | .name = "hash:ip" , |
276 | .protocol = IPSET_PROTOCOL, |
277 | .features = IPSET_TYPE_IP, |
278 | .dimension = IPSET_DIM_ONE, |
279 | .family = NFPROTO_UNSPEC, |
280 | .revision_min = IPSET_TYPE_REV_MIN, |
281 | .revision_max = IPSET_TYPE_REV_MAX, |
282 | .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, |
283 | .create = hash_ip_create, |
284 | .create_policy = { |
285 | [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, |
286 | [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, |
287 | [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, |
288 | [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, |
289 | [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, |
290 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
291 | [IPSET_ATTR_NETMASK] = { .type = NLA_U8 }, |
292 | [IPSET_ATTR_BITMASK] = { .type = NLA_NESTED }, |
293 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
294 | }, |
295 | .adt_policy = { |
296 | [IPSET_ATTR_IP] = { .type = NLA_NESTED }, |
297 | [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED }, |
298 | [IPSET_ATTR_CIDR] = { .type = NLA_U8 }, |
299 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
300 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
301 | [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, |
302 | [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, |
303 | [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING, |
304 | .len = IPSET_MAX_COMMENT_SIZE }, |
305 | [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, |
306 | [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, |
307 | [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, |
308 | }, |
309 | .me = THIS_MODULE, |
310 | }; |
311 | |
312 | static int __init |
313 | hash_ip_init(void) |
314 | { |
315 | return ip_set_type_register(set_type: &hash_ip_type); |
316 | } |
317 | |
318 | static void __exit |
319 | hash_ip_fini(void) |
320 | { |
321 | rcu_barrier(); |
322 | ip_set_type_unregister(set_type: &hash_ip_type); |
323 | } |
324 | |
325 | module_init(hash_ip_init); |
326 | module_exit(hash_ip_fini); |
327 | |