ip_set_hash_ipmac.c

  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
 28MODULE_LICENSE("GPL");
 29MODULE_AUTHOR("Tomasz Chilinski <tomasz.chilinski@chilan.com>");
 30IP_SET_MODULE_DESC("hash:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 31MODULE_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 */
 39struct 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
 50static bool
 51hash_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
 58static bool
 59hash_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;
 64	return false;
 65
 66nla_put_failure:
 67	return true;
 68}
 69
 70static void
 71hash_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
 83static int
 84hash_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(e.ether, eth_hdr(skb)->h_source);
 98	else
 99		ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
100
101	if (is_zero_ether_addr(e.ether))
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
109static int
110hash_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);
137	if (is_zero_ether_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 */
146struct 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
157static bool
158hash_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
166static bool
167hash_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;
172	return false;
173
174nla_put_failure:
175	return true;
176}
177
178static void
179hash_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
196static int
197hash_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(e.ether, eth_hdr(skb)->h_source);
214	else
215		ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
216
217	if (is_zero_ether_addr(e.ether))
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
225static int
226hash_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);
257	if (is_zero_ether_addr(e.ether))
258		return -IPSET_ERR_HASH_ELEM;
259
260	return adtfn(set, &e, &ext, &ext, flags);
261}
262
263static 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
298static int __init
299hash_ipmac_init(void)
300{
301	return ip_set_type_register(&hash_ipmac_type);
302}
303
304static void __exit
305hash_ipmac_fini(void)
306{
307	ip_set_type_unregister(&hash_ipmac_type);
308}
309
310module_init(hash_ipmac_init);
311module_exit(hash_ipmac_fini);