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Linux/net/netfilter/ipset/ip_set_hash_ipmac.c

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  1 /* Copyright (C) 2016 Tomasz Chilinski <tomasz.chilinski@chilan.com>
  2  *
  3  * This program is free software; you can redistribute it and/or modify
  4  * it under the terms of the GNU General Public License version 2 as
  5  * published by the Free Software Foundation.
  6  */
  7 
  8 /* Kernel module implementing an IP set type: the hash:ip,mac type */
  9 
 10 #include <linux/jhash.h>
 11 #include <linux/module.h>
 12 #include <linux/ip.h>
 13 #include <linux/etherdevice.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/errno.h>
 16 #include <linux/random.h>
 17 #include <linux/if_ether.h>
 18 #include <net/ip.h>
 19 #include <net/ipv6.h>
 20 #include <net/netlink.h>
 21 #include <net/tcp.h>
 22 
 23 #include <linux/netfilter.h>
 24 #include <linux/netfilter/ipset/pfxlen.h>
 25 #include <linux/netfilter/ipset/ip_set.h>
 26 #include <linux/netfilter/ipset/ip_set_hash.h>
 27 
 28 #define IPSET_TYPE_REV_MIN      0
 29 #define IPSET_TYPE_REV_MAX      0
 30 
 31 MODULE_LICENSE("GPL");
 32 MODULE_AUTHOR("Tomasz Chilinski <tomasz.chilinski@chilan.com>");
 33 IP_SET_MODULE_DESC("hash:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 34 MODULE_ALIAS("ip_set_hash:ip,mac");
 35 
 36 /* Type specific function prefix */
 37 #define HTYPE           hash_ipmac
 38 
 39 /* Zero valued element is not supported */
 40 static const unsigned char invalid_ether[ETH_ALEN] = { 0 };
 41 
 42 /* IPv4 variant */
 43 
 44 /* Member elements */
 45 struct hash_ipmac4_elem {
 46         /* Zero valued IP addresses cannot be stored */
 47         __be32 ip;
 48         union {
 49                 unsigned char ether[ETH_ALEN];
 50                 __be32 foo[2];
 51         };
 52 };
 53 
 54 /* Common functions */
 55 
 56 static inline bool
 57 hash_ipmac4_data_equal(const struct hash_ipmac4_elem *e1,
 58                        const struct hash_ipmac4_elem *e2,
 59                        u32 *multi)
 60 {
 61         return e1->ip == e2->ip && ether_addr_equal(e1->ether, e2->ether);
 62 }
 63 
 64 static bool
 65 hash_ipmac4_data_list(struct sk_buff *skb, const struct hash_ipmac4_elem *e)
 66 {
 67         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip) ||
 68             nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether))
 69                 goto nla_put_failure;
 70         return false;
 71 
 72 nla_put_failure:
 73         return true;
 74 }
 75 
 76 static inline void
 77 hash_ipmac4_data_next(struct hash_ipmac4_elem *next,
 78                       const struct hash_ipmac4_elem *e)
 79 {
 80         next->ip = e->ip;
 81 }
 82 
 83 #define MTYPE           hash_ipmac4
 84 #define PF              4
 85 #define HOST_MASK       32
 86 #define HKEY_DATALEN    sizeof(struct hash_ipmac4_elem)
 87 #include "ip_set_hash_gen.h"
 88 
 89 static int
 90 hash_ipmac4_kadt(struct ip_set *set, const struct sk_buff *skb,
 91                  const struct xt_action_param *par,
 92                  enum ipset_adt adt, struct ip_set_adt_opt *opt)
 93 {
 94         ipset_adtfn adtfn = set->variant->adt[adt];
 95         struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } };
 96         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 97 
 98          /* MAC can be src only */
 99         if (!(opt->flags & IPSET_DIM_TWO_SRC))
100                 return 0;
101 
102         if (skb_mac_header(skb) < skb->head ||
103             (skb_mac_header(skb) + ETH_HLEN) > skb->data)
104                 return -EINVAL;
105 
106         memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
107         if (ether_addr_equal(e.ether, invalid_ether))
108                 return -EINVAL;
109 
110         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
111 
112         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
113 }
114 
115 static int
116 hash_ipmac4_uadt(struct ip_set *set, struct nlattr *tb[],
117                  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
118 {
119         ipset_adtfn adtfn = set->variant->adt[adt];
120         struct hash_ipmac4_elem e = { .ip = 0, { .foo[0] = 0, .foo[1] = 0 } };
121         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
122         int ret;
123 
124         if (unlikely(!tb[IPSET_ATTR_IP] ||
125                      !tb[IPSET_ATTR_ETHER] ||
126                      nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN ||
127                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
128                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
129                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)   ||
130                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
131                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
132                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
133                 return -IPSET_ERR_PROTOCOL;
134 
135         if (tb[IPSET_ATTR_LINENO])
136                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
137 
138         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
139                 ip_set_get_extensions(set, tb, &ext);
140         if (ret)
141                 return ret;
142         memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
143         if (ether_addr_equal(e.ether, invalid_ether))
144                 return -IPSET_ERR_HASH_ELEM;
145 
146         return adtfn(set, &e, &ext, &ext, flags);
147 }
148 
149 /* IPv6 variant */
150 
151 /* Member elements */
152 struct hash_ipmac6_elem {
153         /* Zero valued IP addresses cannot be stored */
154         union nf_inet_addr ip;
155         union {
156                 unsigned char ether[ETH_ALEN];
157                 __be32 foo[2];
158         };
159 };
160 
161 /* Common functions */
162 
163 static inline bool
164 hash_ipmac6_data_equal(const struct hash_ipmac6_elem *e1,
165                        const struct hash_ipmac6_elem *e2,
166                        u32 *multi)
167 {
168         return ipv6_addr_equal(&e1->ip.in6, &e2->ip.in6) &&
169                 ether_addr_equal(e1->ether, e2->ether);
170 }
171 
172 static bool
173 hash_ipmac6_data_list(struct sk_buff *skb, const struct hash_ipmac6_elem *e)
174 {
175         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
176             nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, e->ether))
177                 goto nla_put_failure;
178         return false;
179 
180 nla_put_failure:
181         return true;
182 }
183 
184 static inline void
185 hash_ipmac6_data_next(struct hash_ipmac6_elem *next,
186                       const struct hash_ipmac6_elem *e)
187 {
188 }
189 
190 #undef MTYPE
191 #undef PF
192 #undef HOST_MASK
193 #undef HKEY_DATALEN
194 
195 #define MTYPE           hash_ipmac6
196 #define PF              6
197 #define HOST_MASK       128
198 #define HKEY_DATALEN    sizeof(struct hash_ipmac6_elem)
199 #define IP_SET_EMIT_CREATE
200 #include "ip_set_hash_gen.h"
201 
202 static int
203 hash_ipmac6_kadt(struct ip_set *set, const struct sk_buff *skb,
204                  const struct xt_action_param *par,
205                  enum ipset_adt adt, struct ip_set_adt_opt *opt)
206 {
207         ipset_adtfn adtfn = set->variant->adt[adt];
208         struct hash_ipmac6_elem e = {
209                 { .all = { 0 } },
210                 { .foo[0] = 0, .foo[1] = 0 }
211         };
212         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
213 
214          /* MAC can be src only */
215         if (!(opt->flags & IPSET_DIM_TWO_SRC))
216                 return 0;
217 
218         if (skb_mac_header(skb) < skb->head ||
219             (skb_mac_header(skb) + ETH_HLEN) > skb->data)
220                 return -EINVAL;
221 
222         memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
223         if (ether_addr_equal(e.ether, invalid_ether))
224                 return -EINVAL;
225 
226         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
227 
228         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
229 }
230 
231 static int
232 hash_ipmac6_uadt(struct ip_set *set, struct nlattr *tb[],
233                  enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
234 {
235         ipset_adtfn adtfn = set->variant->adt[adt];
236         struct hash_ipmac6_elem e = {
237                 { .all = { 0 } },
238                 { .foo[0] = 0, .foo[1] = 0 }
239         };
240         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
241         int ret;
242 
243         if (unlikely(!tb[IPSET_ATTR_IP] ||
244                      !tb[IPSET_ATTR_ETHER] ||
245                      nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN ||
246                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
247                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
248                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)   ||
249                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
250                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
251                      !ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
252                 return -IPSET_ERR_PROTOCOL;
253 
254         if (tb[IPSET_ATTR_LINENO])
255                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
256 
257         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
258                 ip_set_get_extensions(set, tb, &ext);
259         if (ret)
260                 return ret;
261 
262         memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
263         if (ether_addr_equal(e.ether, invalid_ether))
264                 return -IPSET_ERR_HASH_ELEM;
265 
266         return adtfn(set, &e, &ext, &ext, flags);
267 }
268 
269 static struct ip_set_type hash_ipmac_type __read_mostly = {
270         .name           = "hash:ip,mac",
271         .protocol       = IPSET_PROTOCOL,
272         .features       = IPSET_TYPE_IP | IPSET_TYPE_MAC,
273         .dimension      = IPSET_DIM_TWO,
274         .family         = NFPROTO_UNSPEC,
275         .revision_min   = IPSET_TYPE_REV_MIN,
276         .revision_max   = IPSET_TYPE_REV_MAX,
277         .create         = hash_ipmac_create,
278         .create_policy  = {
279                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
280                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
281                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
282                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
283                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
284                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
285         },
286         .adt_policy     = {
287                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
288                 [IPSET_ATTR_ETHER]      = { .type = NLA_BINARY,
289                                 .len  = ETH_ALEN },
290                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
291                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
292                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
293                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
294                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
295                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
296                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
297                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
298         },
299         .me             = THIS_MODULE,
300 };
301 
302 static int __init
303 hash_ipmac_init(void)
304 {
305         return ip_set_type_register(&hash_ipmac_type);
306 }
307 
308 static void __exit
309 hash_ipmac_fini(void)
310 {
311         ip_set_type_unregister(&hash_ipmac_type);
312 }
313 
314 module_init(hash_ipmac_init);
315 module_exit(hash_ipmac_fini);
316 

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