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Linux/net/netfilter/ipset/ip_set_hash_ip.c

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  1 /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  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 type */
  9 
 10 #include <linux/jhash.h>
 11 #include <linux/module.h>
 12 #include <linux/ip.h>
 13 #include <linux/skbuff.h>
 14 #include <linux/errno.h>
 15 #include <linux/random.h>
 16 #include <net/ip.h>
 17 #include <net/ipv6.h>
 18 #include <net/netlink.h>
 19 #include <net/tcp.h>
 20 
 21 #include <linux/netfilter.h>
 22 #include <linux/netfilter/ipset/pfxlen.h>
 23 #include <linux/netfilter/ipset/ip_set.h>
 24 #include <linux/netfilter/ipset/ip_set_hash.h>
 25 
 26 #define IPSET_TYPE_REV_MIN      0
 27 /*                              1          Counters support */
 28 /*                              2          Comments support */
 29 /*                              3          Forceadd support */
 30 #define IPSET_TYPE_REV_MAX      4       /* skbinfo support  */
 31 
 32 MODULE_LICENSE("GPL");
 33 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
 34 IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 35 MODULE_ALIAS("ip_set_hash:ip");
 36 
 37 /* Type specific function prefix */
 38 #define HTYPE           hash_ip
 39 #define IP_SET_HASH_WITH_NETMASK
 40 
 41 /* IPv4 variant */
 42 
 43 /* Member elements */
 44 struct hash_ip4_elem {
 45         /* Zero valued IP addresses cannot be stored */
 46         __be32 ip;
 47 };
 48 
 49 /* Common functions */
 50 
 51 static inline bool
 52 hash_ip4_data_equal(const struct hash_ip4_elem *e1,
 53                     const struct hash_ip4_elem *e2,
 54                     u32 *multi)
 55 {
 56         return e1->ip == e2->ip;
 57 }
 58 
 59 static bool
 60 hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
 61 {
 62         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
 63                 goto nla_put_failure;
 64         return false;
 65 
 66 nla_put_failure:
 67         return true;
 68 }
 69 
 70 static inline void
 71 hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
 72 {
 73         next->ip = e->ip;
 74 }
 75 
 76 #define MTYPE           hash_ip4
 77 #define HOST_MASK       32
 78 #include "ip_set_hash_gen.h"
 79 
 80 static int
 81 hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
 82               const struct xt_action_param *par,
 83               enum ipset_adt adt, struct ip_set_adt_opt *opt)
 84 {
 85         const struct hash_ip4 *h = set->data;
 86         ipset_adtfn adtfn = set->variant->adt[adt];
 87         struct hash_ip4_elem e = { 0 };
 88         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
 89         __be32 ip;
 90 
 91         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
 92         ip &= ip_set_netmask(h->netmask);
 93         if (ip == 0)
 94                 return -EINVAL;
 95 
 96         e.ip = ip;
 97         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
 98 }
 99 
100 static int
101 hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
102               enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
103 {
104         const struct hash_ip4 *h = set->data;
105         ipset_adtfn adtfn = set->variant->adt[adt];
106         struct hash_ip4_elem e = { 0 };
107         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
108         u32 ip = 0, ip_to = 0, hosts;
109         int ret = 0;
110 
111         if (tb[IPSET_ATTR_LINENO])
112                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
113 
114         if (unlikely(!tb[IPSET_ATTR_IP]))
115                 return -IPSET_ERR_PROTOCOL;
116 
117         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
118         if (ret)
119                 return ret;
120 
121         ret = ip_set_get_extensions(set, tb, &ext);
122         if (ret)
123                 return ret;
124 
125         ip &= ip_set_hostmask(h->netmask);
126 
127         if (adt == IPSET_TEST) {
128                 e.ip = htonl(ip);
129                 if (e.ip == 0)
130                         return -IPSET_ERR_HASH_ELEM;
131                 return adtfn(set, &e, &ext, &ext, flags);
132         }
133 
134         ip_to = ip;
135         if (tb[IPSET_ATTR_IP_TO]) {
136                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
137                 if (ret)
138                         return ret;
139                 if (ip > ip_to)
140                         swap(ip, ip_to);
141         } else if (tb[IPSET_ATTR_CIDR]) {
142                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
143 
144                 if (!cidr || cidr > HOST_MASK)
145                         return -IPSET_ERR_INVALID_CIDR;
146                 ip_set_mask_from_to(ip, ip_to, cidr);
147         }
148 
149         hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
150 
151         if (retried)
152                 ip = ntohl(h->next.ip);
153         for (; !before(ip_to, ip); ip += hosts) {
154                 e.ip = htonl(ip);
155                 if (e.ip == 0)
156                         return -IPSET_ERR_HASH_ELEM;
157                 ret = adtfn(set, &e, &ext, &ext, flags);
158 
159                 if (ret && !ip_set_eexist(ret, flags))
160                         return ret;
161 
162                 ret = 0;
163         }
164         return ret;
165 }
166 
167 /* IPv6 variant */
168 
169 /* Member elements */
170 struct hash_ip6_elem {
171         union nf_inet_addr ip;
172 };
173 
174 /* Common functions */
175 
176 static inline bool
177 hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
178                     const struct hash_ip6_elem *ip2,
179                     u32 *multi)
180 {
181         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
182 }
183 
184 static inline void
185 hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
186 {
187         ip6_netmask(ip, prefix);
188 }
189 
190 static bool
191 hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
192 {
193         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
194                 goto nla_put_failure;
195         return false;
196 
197 nla_put_failure:
198         return true;
199 }
200 
201 static inline void
202 hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e)
203 {
204 }
205 
206 #undef MTYPE
207 #undef HOST_MASK
208 
209 #define MTYPE           hash_ip6
210 #define HOST_MASK       128
211 
212 #define IP_SET_EMIT_CREATE
213 #include "ip_set_hash_gen.h"
214 
215 static int
216 hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
217               const struct xt_action_param *par,
218               enum ipset_adt adt, struct ip_set_adt_opt *opt)
219 {
220         const struct hash_ip6 *h = set->data;
221         ipset_adtfn adtfn = set->variant->adt[adt];
222         struct hash_ip6_elem e = { { .all = { 0 } } };
223         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
224 
225         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
226         hash_ip6_netmask(&e.ip, h->netmask);
227         if (ipv6_addr_any(&e.ip.in6))
228                 return -EINVAL;
229 
230         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
231 }
232 
233 static int
234 hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
235               enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
236 {
237         const struct hash_ip6 *h = set->data;
238         ipset_adtfn adtfn = set->variant->adt[adt];
239         struct hash_ip6_elem e = { { .all = { 0 } } };
240         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
241         int ret;
242 
243         if (tb[IPSET_ATTR_LINENO])
244                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
245 
246         if (unlikely(!tb[IPSET_ATTR_IP]))
247                 return -IPSET_ERR_PROTOCOL;
248         if (unlikely(tb[IPSET_ATTR_IP_TO]))
249                 return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
250         if (unlikely(tb[IPSET_ATTR_CIDR])) {
251                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
252 
253                 if (cidr != HOST_MASK)
254                         return -IPSET_ERR_INVALID_CIDR;
255         }
256 
257         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
258         if (ret)
259                 return ret;
260 
261         ret = ip_set_get_extensions(set, tb, &ext);
262         if (ret)
263                 return ret;
264 
265         hash_ip6_netmask(&e.ip, h->netmask);
266         if (ipv6_addr_any(&e.ip.in6))
267                 return -IPSET_ERR_HASH_ELEM;
268 
269         ret = adtfn(set, &e, &ext, &ext, flags);
270 
271         return ip_set_eexist(ret, flags) ? 0 : ret;
272 }
273 
274 static struct ip_set_type hash_ip_type __read_mostly = {
275         .name           = "hash:ip",
276         .protocol       = IPSET_PROTOCOL,
277         .features       = IPSET_TYPE_IP,
278         .dimension      = IPSET_DIM_ONE,
279         .family         = NFPROTO_UNSPEC,
280         .revision_min   = IPSET_TYPE_REV_MIN,
281         .revision_max   = IPSET_TYPE_REV_MAX,
282         .create         = hash_ip_create,
283         .create_policy  = {
284                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
285                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
286                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
287                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
288                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
289                 [IPSET_ATTR_NETMASK]    = { .type = NLA_U8  },
290                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
291         },
292         .adt_policy     = {
293                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
294                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
295                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
296                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
297                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
298                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
299                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
300                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
301                                             .len  = IPSET_MAX_COMMENT_SIZE },
302                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
303                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
304                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
305         },
306         .me             = THIS_MODULE,
307 };
308 
309 static int __init
310 hash_ip_init(void)
311 {
312         return ip_set_type_register(&hash_ip_type);
313 }
314 
315 static void __exit
316 hash_ip_fini(void)
317 {
318         rcu_barrier();
319         ip_set_type_unregister(&hash_ip_type);
320 }
321 
322 module_init(hash_ip_init);
323 module_exit(hash_ip_fini);
324 

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