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,port 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_getport.h>
21 #include <linux/netfilter/ipset/ip_set_hash.h>
22
23 #define IPSET_TYPE_REV_MIN 0
24 /* 1 SCTP and UDPLITE support added */
25 /* 2 Counters support added */
26 /* 3 Comments support added */
27 /* 4 Forceadd support added */
28 /* 5 skbinfo support added */
29 /* 6 bucketsize, initval support added */
30 #define IPSET_TYPE_REV_MAX 7 /* bitmask support added */
31
32 MODULE_LICENSE("GPL");
33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
34 IP_SET_MODULE_DESC("hash:ip,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
35 MODULE_ALIAS("ip_set_hash:ip,port");
36
37 /* Type specific function prefix */
38 #define HTYPE hash_ipport
39 #define IP_SET_HASH_WITH_NETMASK
40 #define IP_SET_HASH_WITH_BITMASK
41
42 /* IPv4 variant */
43
44 /* Member elements */
45 struct hash_ipport4_elem {
46 __be32 ip;
47 __be16 port;
48 u8 proto;
49 u8 padding;
50 };
51
52 /* Common functions */
53
54 static bool
hash_ipport4_data_equal(const struct hash_ipport4_elem * ip1,const struct hash_ipport4_elem * ip2,u32 * multi)55 hash_ipport4_data_equal(const struct hash_ipport4_elem *ip1,
56 const struct hash_ipport4_elem *ip2,
57 u32 *multi)
58 {
59 return ip1->ip == ip2->ip &&
60 ip1->port == ip2->port &&
61 ip1->proto == ip2->proto;
62 }
63
64 static bool
hash_ipport4_data_list(struct sk_buff * skb,const struct hash_ipport4_elem * data)65 hash_ipport4_data_list(struct sk_buff *skb,
66 const struct hash_ipport4_elem *data)
67 {
68 if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
69 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
70 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
71 goto nla_put_failure;
72 return false;
73
74 nla_put_failure:
75 return true;
76 }
77
78 static void
hash_ipport4_data_next(struct hash_ipport4_elem * next,const struct hash_ipport4_elem * d)79 hash_ipport4_data_next(struct hash_ipport4_elem *next,
80 const struct hash_ipport4_elem *d)
81 {
82 next->ip = d->ip;
83 next->port = d->port;
84 }
85
86 #define MTYPE hash_ipport4
87 #define HOST_MASK 32
88 #include "ip_set_hash_gen.h"
89
90 static int
hash_ipport4_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)91 hash_ipport4_kadt(struct ip_set *set, const struct sk_buff *skb,
92 const struct xt_action_param *par,
93 enum ipset_adt adt, struct ip_set_adt_opt *opt)
94 {
95 ipset_adtfn adtfn = set->variant->adt[adt];
96 struct hash_ipport4_elem e = { .ip = 0 };
97 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
98 const struct MTYPE *h = set->data;
99
100 if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
101 &e.port, &e.proto))
102 return -EINVAL;
103
104 ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
105 e.ip &= h->bitmask.ip;
106 if (e.ip == 0)
107 return -EINVAL;
108 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
109 }
110
111 static int
hash_ipport4_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)112 hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
113 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
114 {
115 struct hash_ipport4 *h = set->data;
116 ipset_adtfn adtfn = set->variant->adt[adt];
117 struct hash_ipport4_elem e = { .ip = 0 };
118 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
119 u32 ip, ip_to = 0, p = 0, port, port_to, i = 0;
120 bool with_ports = false;
121 int ret;
122
123 if (tb[IPSET_ATTR_LINENO])
124 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
125
126 if (unlikely(!tb[IPSET_ATTR_IP] ||
127 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
128 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
129 return -IPSET_ERR_PROTOCOL;
130
131 ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip);
132 if (ret)
133 return ret;
134
135 ret = ip_set_get_extensions(set, tb, &ext);
136 if (ret)
137 return ret;
138
139 e.ip &= h->bitmask.ip;
140 if (e.ip == 0)
141 return -EINVAL;
142
143 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
144
145 if (tb[IPSET_ATTR_PROTO]) {
146 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
147 with_ports = ip_set_proto_with_ports(e.proto);
148
149 if (e.proto == 0)
150 return -IPSET_ERR_INVALID_PROTO;
151 } else {
152 return -IPSET_ERR_MISSING_PROTO;
153 }
154
155 if (!(with_ports || e.proto == IPPROTO_ICMP))
156 e.port = 0;
157
158 if (adt == IPSET_TEST ||
159 !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
160 tb[IPSET_ATTR_PORT_TO])) {
161 ret = adtfn(set, &e, &ext, &ext, flags);
162 return ip_set_eexist(ret, flags) ? 0 : ret;
163 }
164
165 ip_to = ip = ntohl(e.ip);
166 if (tb[IPSET_ATTR_IP_TO]) {
167 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
168 if (ret)
169 return ret;
170 if (ip > ip_to)
171 swap(ip, ip_to);
172 } else if (tb[IPSET_ATTR_CIDR]) {
173 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
174
175 if (!cidr || cidr > HOST_MASK)
176 return -IPSET_ERR_INVALID_CIDR;
177 ip_set_mask_from_to(ip, ip_to, cidr);
178 }
179
180 port_to = port = ntohs(e.port);
181 if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
182 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
183 if (port > port_to)
184 swap(port, port_to);
185 }
186
187 if (retried)
188 ip = ntohl(h->next.ip);
189 for (; ip <= ip_to; ip++) {
190 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
191 : port;
192 for (; p <= port_to; p++, i++) {
193 e.ip = htonl(ip);
194 e.port = htons(p);
195 if (i > IPSET_MAX_RANGE) {
196 hash_ipport4_data_next(&h->next, &e);
197 return -ERANGE;
198 }
199 ret = adtfn(set, &e, &ext, &ext, flags);
200
201 if (ret && !ip_set_eexist(ret, flags))
202 return ret;
203
204 ret = 0;
205 }
206 }
207 return ret;
208 }
209
210 /* IPv6 variant */
211
212 struct hash_ipport6_elem {
213 union nf_inet_addr ip;
214 __be16 port;
215 u8 proto;
216 u8 padding;
217 };
218
219 /* Common functions */
220
221 static bool
hash_ipport6_data_equal(const struct hash_ipport6_elem * ip1,const struct hash_ipport6_elem * ip2,u32 * multi)222 hash_ipport6_data_equal(const struct hash_ipport6_elem *ip1,
223 const struct hash_ipport6_elem *ip2,
224 u32 *multi)
225 {
226 return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
227 ip1->port == ip2->port &&
228 ip1->proto == ip2->proto;
229 }
230
231 static bool
hash_ipport6_data_list(struct sk_buff * skb,const struct hash_ipport6_elem * data)232 hash_ipport6_data_list(struct sk_buff *skb,
233 const struct hash_ipport6_elem *data)
234 {
235 if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
236 nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
237 nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
238 goto nla_put_failure;
239 return false;
240
241 nla_put_failure:
242 return true;
243 }
244
245 static void
hash_ipport6_data_next(struct hash_ipport6_elem * next,const struct hash_ipport6_elem * d)246 hash_ipport6_data_next(struct hash_ipport6_elem *next,
247 const struct hash_ipport6_elem *d)
248 {
249 next->port = d->port;
250 }
251
252 #undef MTYPE
253 #undef HOST_MASK
254
255 #define MTYPE hash_ipport6
256 #define HOST_MASK 128
257 #define IP_SET_EMIT_CREATE
258 #include "ip_set_hash_gen.h"
259
260 static int
hash_ipport6_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)261 hash_ipport6_kadt(struct ip_set *set, const struct sk_buff *skb,
262 const struct xt_action_param *par,
263 enum ipset_adt adt, struct ip_set_adt_opt *opt)
264 {
265 ipset_adtfn adtfn = set->variant->adt[adt];
266 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
267 struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
268 const struct MTYPE *h = set->data;
269
270 if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
271 &e.port, &e.proto))
272 return -EINVAL;
273
274 ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
275 nf_inet_addr_mask_inplace(&e.ip, &h->bitmask);
276 if (ipv6_addr_any(&e.ip.in6))
277 return -EINVAL;
278
279 return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
280 }
281
282 static int
hash_ipport6_uadt(struct ip_set * set,struct nlattr * tb[],enum ipset_adt adt,u32 * lineno,u32 flags,bool retried)283 hash_ipport6_uadt(struct ip_set *set, struct nlattr *tb[],
284 enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
285 {
286 const struct hash_ipport6 *h = set->data;
287 ipset_adtfn adtfn = set->variant->adt[adt];
288 struct hash_ipport6_elem e = { .ip = { .all = { 0 } } };
289 struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
290 u32 port, port_to;
291 bool with_ports = false;
292 int ret;
293
294 if (tb[IPSET_ATTR_LINENO])
295 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
296
297 if (unlikely(!tb[IPSET_ATTR_IP] ||
298 !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
299 !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
300 return -IPSET_ERR_PROTOCOL;
301 if (unlikely(tb[IPSET_ATTR_IP_TO]))
302 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
303 if (unlikely(tb[IPSET_ATTR_CIDR])) {
304 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
305
306 if (cidr != HOST_MASK)
307 return -IPSET_ERR_INVALID_CIDR;
308 }
309
310 ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
311 if (ret)
312 return ret;
313
314 ret = ip_set_get_extensions(set, tb, &ext);
315 if (ret)
316 return ret;
317
318 nf_inet_addr_mask_inplace(&e.ip, &h->bitmask);
319 if (ipv6_addr_any(&e.ip.in6))
320 return -EINVAL;
321
322 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
323
324 if (tb[IPSET_ATTR_PROTO]) {
325 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
326 with_ports = ip_set_proto_with_ports(e.proto);
327
328 if (e.proto == 0)
329 return -IPSET_ERR_INVALID_PROTO;
330 } else {
331 return -IPSET_ERR_MISSING_PROTO;
332 }
333
334 if (!(with_ports || e.proto == IPPROTO_ICMPV6))
335 e.port = 0;
336
337 if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
338 ret = adtfn(set, &e, &ext, &ext, flags);
339 return ip_set_eexist(ret, flags) ? 0 : ret;
340 }
341
342 port = ntohs(e.port);
343 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
344 if (port > port_to)
345 swap(port, port_to);
346
347 if (retried)
348 port = ntohs(h->next.port);
349 for (; port <= port_to; port++) {
350 e.port = htons(port);
351 ret = adtfn(set, &e, &ext, &ext, flags);
352
353 if (ret && !ip_set_eexist(ret, flags))
354 return ret;
355
356 ret = 0;
357 }
358 return ret;
359 }
360
361 static struct ip_set_type hash_ipport_type __read_mostly = {
362 .name = "hash:ip,port",
363 .protocol = IPSET_PROTOCOL,
364 .features = IPSET_TYPE_IP | IPSET_TYPE_PORT,
365 .dimension = IPSET_DIM_TWO,
366 .family = NFPROTO_UNSPEC,
367 .revision_min = IPSET_TYPE_REV_MIN,
368 .revision_max = IPSET_TYPE_REV_MAX,
369 .create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
370 .create = hash_ipport_create,
371 .create_policy = {
372 [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
373 [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
374 [IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
375 [IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
376 [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
377 [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
378 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
379 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
380 [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
381 [IPSET_ATTR_BITMASK] = { .type = NLA_NESTED },
382 },
383 .adt_policy = {
384 [IPSET_ATTR_IP] = { .type = NLA_NESTED },
385 [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
386 [IPSET_ATTR_PORT] = { .type = NLA_U16 },
387 [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
388 [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
389 [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
390 [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
391 [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
392 [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
393 [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
394 [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
395 .len = IPSET_MAX_COMMENT_SIZE },
396 [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
397 [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
398 [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
399 },
400 .me = THIS_MODULE,
401 };
402
403 static int __init
hash_ipport_init(void)404 hash_ipport_init(void)
405 {
406 return ip_set_type_register(&hash_ipport_type);
407 }
408
409 static void __exit
hash_ipport_fini(void)410 hash_ipport_fini(void)
411 {
412 rcu_barrier();
413 ip_set_type_unregister(&hash_ipport_type);
414 }
415
416 module_init(hash_ipport_init);
417 module_exit(hash_ipport_fini);
418