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
27MODULE_LICENSE("GPL");
28MODULE_AUTHOR("Vytas Dauksa <vytas.dauksa@smoothwall.net>");
29IP_SET_MODULE_DESC("hash:ip,mark", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
30MODULE_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 */
39struct hash_ipmark4_elem {
40 __be32 ip;
41 __u32 mark;
42};
43
44/* Common functions */
45
46static bool
47hash_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
55static bool
56hash_ipmark4_data_list(struct sk_buff *skb,
57 const struct hash_ipmark4_elem *data)
58{
59 if (nla_put_ipaddr4(skb, type: IPSET_ATTR_IP, ipaddr: data->ip) ||
60 nla_put_net32(skb, attrtype: IPSET_ATTR_MARK, htonl(data->mark)))
61 goto nla_put_failure;
62 return false;
63
64nla_put_failure:
65 return true;
66}
67
68static void
69hash_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
79static int
80hash_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, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &e.ip);
93 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
94}
95
96static int
97hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
98 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
99{
100 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, i = 0;
105 int ret;
106
107 if (tb[IPSET_ATTR_LINENO])
108 *lineno = nla_get_u32(nla: 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(nla: tb[IPSET_ATTR_IP], ipaddr: &e.ip);
115 if (ret)
116 return ret;
117
118 ret = ip_set_get_extensions(set, tb, ext: &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(nla: tb[IPSET_ATTR_IP_TO], ipaddr: &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(nla: 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 (retried)
152 ip = ntohl(h->next.ip);
153 for (; ip <= ip_to; ip++, i++) {
154 e.ip = htonl(ip);
155 if (i > IPSET_MAX_RANGE) {
156 hash_ipmark4_data_next(next: &h->next, d: &e);
157 return -ERANGE;
158 }
159 ret = adtfn(set, &e, &ext, &ext, flags);
160
161 if (ret && !ip_set_eexist(ret, flags))
162 return ret;
163
164 ret = 0;
165 }
166 return ret;
167}
168
169/* IPv6 variant */
170
171struct hash_ipmark6_elem {
172 union nf_inet_addr ip;
173 __u32 mark;
174};
175
176/* Common functions */
177
178static bool
179hash_ipmark6_data_equal(const struct hash_ipmark6_elem *ip1,
180 const struct hash_ipmark6_elem *ip2,
181 u32 *multi)
182{
183 return ipv6_addr_equal(a1: &ip1->ip.in6, a2: &ip2->ip.in6) &&
184 ip1->mark == ip2->mark;
185}
186
187static bool
188hash_ipmark6_data_list(struct sk_buff *skb,
189 const struct hash_ipmark6_elem *data)
190{
191 if (nla_put_ipaddr6(skb, type: IPSET_ATTR_IP, ipaddrptr: &data->ip.in6) ||
192 nla_put_net32(skb, attrtype: IPSET_ATTR_MARK, htonl(data->mark)))
193 goto nla_put_failure;
194 return false;
195
196nla_put_failure:
197 return true;
198}
199
200static void
201hash_ipmark6_data_next(struct hash_ipmark6_elem *next,
202 const struct hash_ipmark6_elem *d)
203{
204}
205
206#undef MTYPE
207#undef HOST_MASK
208
209#define MTYPE hash_ipmark6
210#define HOST_MASK 128
211#define IP_SET_EMIT_CREATE
212#include "ip_set_hash_gen.h"
213
214static int
215hash_ipmark6_kadt(struct ip_set *set, const struct sk_buff *skb,
216 const struct xt_action_param *par,
217 enum ipset_adt adt, struct ip_set_adt_opt *opt)
218{
219 const struct hash_ipmark6 *h = set->data;
220 ipset_adtfn adtfn = set->variant->adt[adt];
221 struct hash_ipmark6_elem e = { };
222 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
223
224 e.mark = skb->mark;
225 e.mark &= h->markmask;
226
227 ip6addrptr(skb, src: opt->flags & IPSET_DIM_ONE_SRC, addr: &e.ip.in6);
228 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
229}
230
231static int
232hash_ipmark6_uadt(struct ip_set *set, struct nlattr *tb[],
233 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
234{
235 const struct hash_ipmark6 *h = set->data;
236 ipset_adtfn adtfn = set->variant->adt[adt];
237 struct hash_ipmark6_elem e = { };
238 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
239 int ret;
240
241 if (tb[IPSET_ATTR_LINENO])
242 *lineno = nla_get_u32(nla: tb[IPSET_ATTR_LINENO]);
243
244 if (unlikely(!tb[IPSET_ATTR_IP] ||
245 !ip_set_attr_netorder(tb, IPSET_ATTR_MARK)))
246 return -IPSET_ERR_PROTOCOL;
247 if (unlikely(tb[IPSET_ATTR_IP_TO]))
248 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
249 if (unlikely(tb[IPSET_ATTR_CIDR])) {
250 u8 cidr = nla_get_u8(nla: tb[IPSET_ATTR_CIDR]);
251
252 if (cidr != HOST_MASK)
253 return -IPSET_ERR_INVALID_CIDR;
254 }
255
256 ret = ip_set_get_ipaddr6(nla: tb[IPSET_ATTR_IP], ipaddr: &e.ip);
257 if (ret)
258 return ret;
259
260 ret = ip_set_get_extensions(set, tb, ext: &ext);
261 if (ret)
262 return ret;
263
264 e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK]));
265 e.mark &= h->markmask;
266
267 if (adt == IPSET_TEST) {
268 ret = adtfn(set, &e, &ext, &ext, flags);
269 return ip_set_eexist(ret, flags) ? 0 : ret;
270 }
271
272 ret = adtfn(set, &e, &ext, &ext, flags);
273 if (ret && !ip_set_eexist(ret, flags))
274 return ret;
275
276 return 0;
277}
278
279static struct ip_set_type hash_ipmark_type __read_mostly = {
280 .name = "hash:ip,mark",
281 .protocol = IPSET_PROTOCOL,
282 .features = IPSET_TYPE_IP | IPSET_TYPE_MARK,
283 .dimension = IPSET_DIM_TWO,
284 .family = NFPROTO_UNSPEC,
285 .revision_min = IPSET_TYPE_REV_MIN,
286 .revision_max = IPSET_TYPE_REV_MAX,
287 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
288 .create = hash_ipmark_create,
289 .create_policy = {
290 [IPSET_ATTR_MARKMASK] = { .type = NLA_U32 },
291 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
292 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
293 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
294 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
295 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
296 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
297 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
298 },
299 .adt_policy = {
300 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
301 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
302 [IPSET_ATTR_MARK] = { .type = NLA_U32 },
303 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
304 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
305 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
306 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
307 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
308 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
309 .len = IPSET_MAX_COMMENT_SIZE },
310 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
311 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
312 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
313 },
314 .me = THIS_MODULE,
315};
316
317static int __init
318hash_ipmark_init(void)
319{
320 return ip_set_type_register(set_type: &hash_ipmark_type);
321}
322
323static void __exit
324hash_ipmark_fini(void)
325{
326 rcu_barrier();
327 ip_set_type_unregister(set_type: &hash_ipmark_type);
328}
329
330module_init(hash_ipmark_init);
331module_exit(hash_ipmark_fini);
332

source code of linux/net/netfilter/ipset/ip_set_hash_ipmark.c