1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* Copyright (C) 2016 Tomasz Chilinski <tomasz.chilinski@chilan.com> |
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 1 /* bucketsize, initval support */ |
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 | |
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 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(addr1: e1->ether, addr2: 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, type: IPSET_ATTR_IP, ipaddr: e->ip) || |
62 | nla_put(skb, attrtype: IPSET_ATTR_ETHER, ETH_ALEN, data: e->ether)) |
63 | goto nla_put_failure; |
64 | return false; |
65 | |
66 | nla_put_failure: |
67 | return true; |
68 | } |
69 | |
70 | static 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 | |
92 | if (skb_mac_header(skb) < skb->head || |
93 | (skb_mac_header(skb) + ETH_HLEN) > skb->data) |
94 | return -EINVAL; |
95 | |
96 | if (opt->flags & IPSET_DIM_TWO_SRC) |
97 | ether_addr_copy(dst: e.ether, src: eth_hdr(skb)->h_source); |
98 | else |
99 | ether_addr_copy(dst: e.ether, src: eth_hdr(skb)->h_dest); |
100 | |
101 | if (is_zero_ether_addr(addr: e.ether)) |
102 | return -EINVAL; |
103 | |
104 | ip4addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &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(nla: tb[IPSET_ATTR_LINENO]); |
131 | |
132 | ret = ip_set_get_ipaddr4(nla: tb[IPSET_ATTR_IP], ipaddr: &e.ip) || |
133 | ip_set_get_extensions(set, tb, ext: &ext); |
134 | if (ret) |
135 | return ret; |
136 | memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); |
137 | if (is_zero_ether_addr(addr: e.ether)) |
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 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(a1: &e1->ip.in6, a2: &e2->ip.in6) && |
163 | ether_addr_equal(addr1: e1->ether, addr2: 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, type: IPSET_ATTR_IP, ipaddrptr: &e->ip.in6) || |
170 | nla_put(skb, attrtype: IPSET_ATTR_ETHER, ETH_ALEN, data: e->ether)) |
171 | goto nla_put_failure; |
172 | return false; |
173 | |
174 | nla_put_failure: |
175 | return true; |
176 | } |
177 | |
178 | static 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 | |
208 | if (skb_mac_header(skb) < skb->head || |
209 | (skb_mac_header(skb) + ETH_HLEN) > skb->data) |
210 | return -EINVAL; |
211 | |
212 | if (opt->flags & IPSET_DIM_TWO_SRC) |
213 | ether_addr_copy(dst: e.ether, src: eth_hdr(skb)->h_source); |
214 | else |
215 | ether_addr_copy(dst: e.ether, src: eth_hdr(skb)->h_dest); |
216 | |
217 | if (is_zero_ether_addr(addr: e.ether)) |
218 | return -EINVAL; |
219 | |
220 | ip6addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &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(nla: tb[IPSET_ATTR_LINENO]); |
250 | |
251 | ret = ip_set_get_ipaddr6(nla: tb[IPSET_ATTR_IP], ipaddr: &e.ip) || |
252 | ip_set_get_extensions(set, tb, ext: &ext); |
253 | if (ret) |
254 | return ret; |
255 | |
256 | memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN); |
257 | if (is_zero_ether_addr(addr: e.ether)) |
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_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE, |
272 | .create = hash_ipmac_create, |
273 | .create_policy = { |
274 | [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 }, |
275 | [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 }, |
276 | [IPSET_ATTR_INITVAL] = { .type = NLA_U32 }, |
277 | [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 }, |
278 | [IPSET_ATTR_RESIZE] = { .type = NLA_U8 }, |
279 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
280 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, |
281 | }, |
282 | .adt_policy = { |
283 | [IPSET_ATTR_IP] = { .type = NLA_NESTED }, |
284 | [IPSET_ATTR_ETHER] = { .type = NLA_BINARY, |
285 | .len = ETH_ALEN }, |
286 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, |
287 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, |
288 | [IPSET_ATTR_BYTES] = { .type = NLA_U64 }, |
289 | [IPSET_ATTR_PACKETS] = { .type = NLA_U64 }, |
290 | [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING }, |
291 | [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 }, |
292 | [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 }, |
293 | [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 }, |
294 | }, |
295 | .me = THIS_MODULE, |
296 | }; |
297 | |
298 | static int __init |
299 | hash_ipmac_init(void) |
300 | { |
301 | return ip_set_type_register(set_type: &hash_ipmac_type); |
302 | } |
303 | |
304 | static void __exit |
305 | hash_ipmac_fini(void) |
306 | { |
307 | ip_set_type_unregister(set_type: &hash_ipmac_type); |
308 | } |
309 | |
310 | module_init(hash_ipmac_init); |
311 | module_exit(hash_ipmac_fini); |
312 | |