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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c0db95c7 | 2 | /* Copyright (C) 2016 Tomasz Chilinski <tomasz.chilinski@chilan.com> |
c0db95c7 TC |
3 | */ |
4 | ||
5 | /* Kernel module implementing an IP set type: the hash:ip,mac type */ | |
6 | ||
7 | #include <linux/jhash.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/ip.h> | |
10 | #include <linux/etherdevice.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/random.h> | |
14 | #include <linux/if_ether.h> | |
15 | #include <net/ip.h> | |
16 | #include <net/ipv6.h> | |
17 | #include <net/netlink.h> | |
18 | #include <net/tcp.h> | |
19 | ||
20 | #include <linux/netfilter.h> | |
21 | #include <linux/netfilter/ipset/pfxlen.h> | |
22 | #include <linux/netfilter/ipset/ip_set.h> | |
23 | #include <linux/netfilter/ipset/ip_set_hash.h> | |
24 | ||
25 | #define IPSET_TYPE_REV_MIN 0 | |
26 | #define IPSET_TYPE_REV_MAX 0 | |
27 | ||
28 | MODULE_LICENSE("GPL"); | |
29 | MODULE_AUTHOR("Tomasz Chilinski <tomasz.chilinski@chilan.com>"); | |
30 | IP_SET_MODULE_DESC("hash:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX); | |
31 | MODULE_ALIAS("ip_set_hash:ip,mac"); | |
32 | ||
33 | /* Type specific function prefix */ | |
34 | #define HTYPE hash_ipmac | |
35 | ||
c0db95c7 TC |
36 | /* IPv4 variant */ |
37 | ||
38 | /* Member elements */ | |
39 | struct hash_ipmac4_elem { | |
40 | /* Zero valued IP addresses cannot be stored */ | |
41 | __be32 ip; | |
42 | union { | |
43 | unsigned char ether[ETH_ALEN]; | |
44 | __be32 foo[2]; | |
45 | }; | |
46 | }; | |
47 | ||
48 | /* Common functions */ | |
49 | ||
50 | static inline bool | |
51 | hash_ipmac4_data_equal(const struct hash_ipmac4_elem *e1, | |
52 | const struct hash_ipmac4_elem *e2, | |
53 | u32 *multi) | |
54 | { | |
55 | return e1->ip == e2->ip && ether_addr_equal(e1->ether, e2->ether); | |
56 | } | |
57 | ||
58 | static bool | |
59 | hash_ipmac4_data_list(struct sk_buff *skb, const struct hash_ipmac4_elem *e) | |
60 | { | |
61 | if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip) || | |
62 | nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) | |
63 | goto nla_put_failure; | |
737d387b | 64 | return false; |
c0db95c7 TC |
65 | |
66 | nla_put_failure: | |
737d387b | 67 | return true; |
c0db95c7 TC |
68 | } |
69 | ||
70 | static inline void | |
71 | hash_ipmac4_data_next(struct hash_ipmac4_elem *next, | |
72 | const struct hash_ipmac4_elem *e) | |
73 | { | |
74 | next->ip = e->ip; | |
75 | } | |
76 | ||
77 | #define MTYPE hash_ipmac4 | |
78 | #define PF 4 | |
79 | #define HOST_MASK 32 | |
80 | #define HKEY_DATALEN sizeof(struct hash_ipmac4_elem) | |
81 | #include "ip_set_hash_gen.h" | |
82 | ||
83 | static int | |
84 | hash_ipmac4_kadt(struct ip_set *set, const struct sk_buff *skb, | |
85 | const struct xt_action_param *par, | |
86 | enum ipset_adt adt, struct ip_set_adt_opt *opt) | |
87 | { | |
88 | ipset_adtfn adtfn = set->variant->adt[adt]; | |
89 | struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; | |
90 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); | |
91 | ||
c0db95c7 TC |
92 | if (skb_mac_header(skb) < skb->head || |
93 | (skb_mac_header(skb) + ETH_HLEN) > skb->data) | |
94 | return -EINVAL; | |
95 | ||
1b4a7510 | 96 | if (opt->flags & IPSET_DIM_TWO_SRC) |
8cc4ccf5 SB |
97 | ether_addr_copy(e.ether, eth_hdr(skb)->h_source); |
98 | else | |
99 | ether_addr_copy(e.ether, eth_hdr(skb)->h_dest); | |
100 | ||
29edbc3e | 101 | if (is_zero_ether_addr(e.ether)) |
c0db95c7 TC |
102 | return -EINVAL; |
103 | ||
104 | ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip); | |
105 | ||
106 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); | |
107 | } | |
108 | ||
109 | static int | |
110 | hash_ipmac4_uadt(struct ip_set *set, struct nlattr *tb[], | |
111 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) | |
112 | { | |
113 | ipset_adtfn adtfn = set->variant->adt[adt]; | |
114 | struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } }; | |
115 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); | |
116 | int ret; | |
117 | ||
118 | if (unlikely(!tb[IPSET_ATTR_IP] || | |
119 | !tb[IPSET_ATTR_ETHER] || | |
120 | nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || | |
121 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || | |
122 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || | |
123 | !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || | |
124 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || | |
125 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || | |
126 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) | |
127 | return -IPSET_ERR_PROTOCOL; | |
128 | ||
129 | if (tb[IPSET_ATTR_LINENO]) | |
130 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
131 | ||
132 | ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) || | |
133 | ip_set_get_extensions(set, tb, &ext); | |
134 | if (ret) | |
135 | return ret; | |
136 | memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); | |
29edbc3e | 137 | if (is_zero_ether_addr(e.ether)) |
c0db95c7 TC |
138 | return -IPSET_ERR_HASH_ELEM; |
139 | ||
140 | return adtfn(set, &e, &ext, &ext, flags); | |
141 | } | |
142 | ||
143 | /* IPv6 variant */ | |
144 | ||
145 | /* Member elements */ | |
146 | struct hash_ipmac6_elem { | |
147 | /* Zero valued IP addresses cannot be stored */ | |
148 | union nf_inet_addr ip; | |
149 | union { | |
150 | unsigned char ether[ETH_ALEN]; | |
151 | __be32 foo[2]; | |
152 | }; | |
153 | }; | |
154 | ||
155 | /* Common functions */ | |
156 | ||
157 | static inline bool | |
158 | hash_ipmac6_data_equal(const struct hash_ipmac6_elem *e1, | |
159 | const struct hash_ipmac6_elem *e2, | |
160 | u32 *multi) | |
161 | { | |
162 | return ipv6_addr_equal(&e1->ip.in6, &e2->ip.in6) && | |
163 | ether_addr_equal(e1->ether, e2->ether); | |
164 | } | |
165 | ||
166 | static bool | |
167 | hash_ipmac6_data_list(struct sk_buff *skb, const struct hash_ipmac6_elem *e) | |
168 | { | |
169 | if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) || | |
170 | nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether)) | |
171 | goto nla_put_failure; | |
737d387b | 172 | return false; |
c0db95c7 TC |
173 | |
174 | nla_put_failure: | |
737d387b | 175 | return true; |
c0db95c7 TC |
176 | } |
177 | ||
178 | static inline void | |
179 | hash_ipmac6_data_next(struct hash_ipmac6_elem *next, | |
180 | const struct hash_ipmac6_elem *e) | |
181 | { | |
182 | } | |
183 | ||
184 | #undef MTYPE | |
185 | #undef PF | |
186 | #undef HOST_MASK | |
187 | #undef HKEY_DATALEN | |
188 | ||
189 | #define MTYPE hash_ipmac6 | |
190 | #define PF 6 | |
191 | #define HOST_MASK 128 | |
192 | #define HKEY_DATALEN sizeof(struct hash_ipmac6_elem) | |
193 | #define IP_SET_EMIT_CREATE | |
194 | #include "ip_set_hash_gen.h" | |
195 | ||
196 | static int | |
197 | hash_ipmac6_kadt(struct ip_set *set, const struct sk_buff *skb, | |
198 | const struct xt_action_param *par, | |
199 | enum ipset_adt adt, struct ip_set_adt_opt *opt) | |
200 | { | |
201 | ipset_adtfn adtfn = set->variant->adt[adt]; | |
202 | struct hash_ipmac6_elem e = { | |
203 | { .all = { 0 } }, | |
204 | { .foo[0] = 0, .foo[1] = 0 } | |
205 | }; | |
206 | struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set); | |
207 | ||
c0db95c7 TC |
208 | if (skb_mac_header(skb) < skb->head || |
209 | (skb_mac_header(skb) + ETH_HLEN) > skb->data) | |
210 | return -EINVAL; | |
211 | ||
8cc4ccf5 SB |
212 | if (opt->flags & IPSET_DIM_ONE_SRC) |
213 | ether_addr_copy(e.ether, eth_hdr(skb)->h_source); | |
214 | else | |
215 | ether_addr_copy(e.ether, eth_hdr(skb)->h_dest); | |
216 | ||
29edbc3e | 217 | if (is_zero_ether_addr(e.ether)) |
c0db95c7 TC |
218 | return -EINVAL; |
219 | ||
220 | ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6); | |
221 | ||
222 | return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags); | |
223 | } | |
224 | ||
225 | static int | |
226 | hash_ipmac6_uadt(struct ip_set *set, struct nlattr *tb[], | |
227 | enum ipset_adt adt, u32 *lineno, u32 flags, bool retried) | |
228 | { | |
229 | ipset_adtfn adtfn = set->variant->adt[adt]; | |
230 | struct hash_ipmac6_elem e = { | |
231 | { .all = { 0 } }, | |
232 | { .foo[0] = 0, .foo[1] = 0 } | |
233 | }; | |
234 | struct ip_set_ext ext = IP_SET_INIT_UEXT(set); | |
235 | int ret; | |
236 | ||
237 | if (unlikely(!tb[IPSET_ATTR_IP] || | |
238 | !tb[IPSET_ATTR_ETHER] || | |
239 | nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN || | |
240 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || | |
241 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) || | |
242 | !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) || | |
243 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) || | |
244 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) || | |
245 | !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE))) | |
246 | return -IPSET_ERR_PROTOCOL; | |
247 | ||
248 | if (tb[IPSET_ATTR_LINENO]) | |
249 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
250 | ||
251 | ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) || | |
252 | ip_set_get_extensions(set, tb, &ext); | |
253 | if (ret) | |
254 | return ret; | |
255 | ||
256 | memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); | |
29edbc3e | 257 | if (is_zero_ether_addr(e.ether)) |
c0db95c7 TC |
258 | return -IPSET_ERR_HASH_ELEM; |
259 | ||
260 | return adtfn(set, &e, &ext, &ext, flags); | |
261 | } | |
262 | ||
263 | static struct ip_set_type hash_ipmac_type __read_mostly = { | |
264 | .name = "hash:ip,mac", | |
265 | .protocol = IPSET_PROTOCOL, | |
266 | .features = IPSET_TYPE_IP | IPSET_TYPE_MAC, | |
267 | .dimension = IPSET_DIM_TWO, | |
268 | .family = NFPROTO_UNSPEC, | |
269 | .revision_min = IPSET_TYPE_REV_MIN, | |
270 | .revision_max = IPSET_TYPE_REV_MAX, | |
271 | .create = hash_ipmac_create, | |
272 | .create_policy = { | |
273 | [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, | |
274 | [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, | |
275 | [IPSET_ATTR_PROBES] = { .type = NLA_U8 }, | |
276 | [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, | |
277 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
278 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, | |
279 | }, | |
280 | .adt_policy = { | |
281 | [IPSET_ATTR_IP] = { .type = NLA_NESTED }, | |
282 | [IPSET_ATTR_ETHER] = { .type = NLA_BINARY, | |
283 | .len = ETH_ALEN }, | |
284 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
285 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
286 | [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, | |
287 | [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, | |
288 | [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING }, | |
289 | [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, | |
290 | [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, | |
291 | [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, | |
292 | }, | |
293 | .me = THIS_MODULE, | |
294 | }; | |
295 | ||
296 | static int __init | |
297 | hash_ipmac_init(void) | |
298 | { | |
299 | return ip_set_type_register(&hash_ipmac_type); | |
300 | } | |
301 | ||
302 | static void __exit | |
303 | hash_ipmac_fini(void) | |
304 | { | |
305 | ip_set_type_unregister(&hash_ipmac_type); | |
306 | } | |
307 | ||
308 | module_init(hash_ipmac_init); | |
309 | module_exit(hash_ipmac_fini); |