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Linux/net/netfilter/ipset/ip_set_hash_ipportip.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,port,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_getport.h>
 25 #include <linux/netfilter/ipset/ip_set_hash.h>
 26 
 27 #define IPSET_TYPE_REV_MIN      0
 28 /*                              1    SCTP and UDPLITE support added */
 29 /*                              2    Counters support added */
 30 /*                              3    Comments support added */
 31 #define IPSET_TYPE_REV_MAX      4 /* Forceadd support added */
 32 
 33 MODULE_LICENSE("GPL");
 34 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
 35 IP_SET_MODULE_DESC("hash:ip,port,ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 36 MODULE_ALIAS("ip_set_hash:ip,port,ip");
 37 
 38 /* Type specific function prefix */
 39 #define HTYPE           hash_ipportip
 40 
 41 /* IPv4 variant */
 42 
 43 /* Member elements  */
 44 struct hash_ipportip4_elem {
 45         __be32 ip;
 46         __be32 ip2;
 47         __be16 port;
 48         u8 proto;
 49         u8 padding;
 50 };
 51 
 52 static inline bool
 53 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
 54                           const struct hash_ipportip4_elem *ip2,
 55                           u32 *multi)
 56 {
 57         return ip1->ip == ip2->ip &&
 58                ip1->ip2 == ip2->ip2 &&
 59                ip1->port == ip2->port &&
 60                ip1->proto == ip2->proto;
 61 }
 62 
 63 static bool
 64 hash_ipportip4_data_list(struct sk_buff *skb,
 65                        const struct hash_ipportip4_elem *data)
 66 {
 67         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 68             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
 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 0;
 73 
 74 nla_put_failure:
 75         return 1;
 76 }
 77 
 78 static inline void
 79 hash_ipportip4_data_next(struct hash_ipportip4_elem *next,
 80                          const struct hash_ipportip4_elem *d)
 81 {
 82         next->ip = d->ip;
 83         next->port = d->port;
 84 }
 85 
 86 /* Common functions */
 87 #define MTYPE           hash_ipportip4
 88 #define PF              4
 89 #define HOST_MASK       32
 90 #include "ip_set_hash_gen.h"
 91 
 92 static int
 93 hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
 94                     const struct xt_action_param *par,
 95                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
 96 {
 97         ipset_adtfn adtfn = set->variant->adt[adt];
 98         struct hash_ipportip4_elem e = { };
 99         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
100 
101         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
102                                  &e.port, &e.proto))
103                 return -EINVAL;
104 
105         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
106         ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
107         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
108 }
109 
110 static int
111 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
112                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
113 {
114         const struct hash_ipportip *h = set->data;
115         ipset_adtfn adtfn = set->variant->adt[adt];
116         struct hash_ipportip4_elem e = { };
117         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
118         u32 ip, ip_to = 0, p = 0, port, port_to;
119         bool with_ports = false;
120         int ret;
121 
122         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
123                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
124                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
125                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
126                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
127                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
128                 return -IPSET_ERR_PROTOCOL;
129 
130         if (tb[IPSET_ATTR_LINENO])
131                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
132 
133         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
134               ip_set_get_extensions(set, tb, &ext);
135         if (ret)
136                 return ret;
137 
138         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &e.ip2);
139         if (ret)
140                 return ret;
141 
142         if (tb[IPSET_ATTR_PORT])
143                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
144         else
145                 return -IPSET_ERR_PROTOCOL;
146 
147         if (tb[IPSET_ATTR_PROTO]) {
148                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
149                 with_ports = ip_set_proto_with_ports(e.proto);
150 
151                 if (e.proto == 0)
152                         return -IPSET_ERR_INVALID_PROTO;
153         } else
154                 return -IPSET_ERR_MISSING_PROTO;
155 
156         if (!(with_ports || e.proto == IPPROTO_ICMP))
157                 e.port = 0;
158 
159         if (adt == IPSET_TEST ||
160             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
161               tb[IPSET_ATTR_PORT_TO])) {
162                 ret = adtfn(set, &e, &ext, &ext, flags);
163                 return ip_set_eexist(ret, flags) ? 0 : ret;
164         }
165 
166         ip_to = ip = ntohl(e.ip);
167         if (tb[IPSET_ATTR_IP_TO]) {
168                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
169                 if (ret)
170                         return ret;
171                 if (ip > ip_to)
172                         swap(ip, ip_to);
173         } else if (tb[IPSET_ATTR_CIDR]) {
174                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
175 
176                 if (!cidr || cidr > 32)
177                         return -IPSET_ERR_INVALID_CIDR;
178                 ip_set_mask_from_to(ip, ip_to, cidr);
179         }
180 
181         port_to = port = ntohs(e.port);
182         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
183                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
184                 if (port > port_to)
185                         swap(port, port_to);
186         }
187 
188         if (retried)
189                 ip = ntohl(h->next.ip);
190         for (; !before(ip_to, ip); ip++) {
191                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
192                                                        : port;
193                 for (; p <= port_to; p++) {
194                         e.ip = htonl(ip);
195                         e.port = htons(p);
196                         ret = adtfn(set, &e, &ext, &ext, flags);
197 
198                         if (ret && !ip_set_eexist(ret, flags))
199                                 return ret;
200                         else
201                                 ret = 0;
202                 }
203         }
204         return ret;
205 }
206 
207 /* IPv6 variant */
208 
209 struct hash_ipportip6_elem {
210         union nf_inet_addr ip;
211         union nf_inet_addr ip2;
212         __be16 port;
213         u8 proto;
214         u8 padding;
215 };
216 
217 /* Common functions */
218 
219 static inline bool
220 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
221                           const struct hash_ipportip6_elem *ip2,
222                           u32 *multi)
223 {
224         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
225                ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
226                ip1->port == ip2->port &&
227                ip1->proto == ip2->proto;
228 }
229 
230 static bool
231 hash_ipportip6_data_list(struct sk_buff *skb,
232                          const struct hash_ipportip6_elem *data)
233 {
234         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
235             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.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 0;
240 
241 nla_put_failure:
242         return 1;
243 }
244 
245 static inline void
246 hash_ipportip6_data_next(struct hash_ipportip4_elem *next,
247                          const struct hash_ipportip6_elem *d)
248 {
249         next->port = d->port;
250 }
251 
252 #undef MTYPE
253 #undef PF
254 #undef HOST_MASK
255 
256 #define MTYPE           hash_ipportip6
257 #define PF              6
258 #define HOST_MASK       128
259 #define IP_SET_EMIT_CREATE
260 #include "ip_set_hash_gen.h"
261 
262 static int
263 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
264                     const struct xt_action_param *par,
265                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
266 {
267         ipset_adtfn adtfn = set->variant->adt[adt];
268         struct hash_ipportip6_elem e = { };
269         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
270 
271         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
272                                  &e.port, &e.proto))
273                 return -EINVAL;
274 
275         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
276         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
277         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
278 }
279 
280 static int
281 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
282                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
283 {
284         const struct hash_ipportip *h = set->data;
285         ipset_adtfn adtfn = set->variant->adt[adt];
286         struct hash_ipportip6_elem e = { };
287         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
288         u32 port, port_to;
289         bool with_ports = false;
290         int ret;
291 
292         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
293                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
294                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
295                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
296                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
297                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
298                      tb[IPSET_ATTR_IP_TO] ||
299                      tb[IPSET_ATTR_CIDR]))
300                 return -IPSET_ERR_PROTOCOL;
301 
302         if (tb[IPSET_ATTR_LINENO])
303                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
304 
305         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
306               ip_set_get_extensions(set, tb, &ext);
307         if (ret)
308                 return ret;
309 
310         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
311         if (ret)
312                 return ret;
313 
314         if (tb[IPSET_ATTR_PORT])
315                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
316         else
317                 return -IPSET_ERR_PROTOCOL;
318 
319         if (tb[IPSET_ATTR_PROTO]) {
320                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
321                 with_ports = ip_set_proto_with_ports(e.proto);
322 
323                 if (e.proto == 0)
324                         return -IPSET_ERR_INVALID_PROTO;
325         } else
326                 return -IPSET_ERR_MISSING_PROTO;
327 
328         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
329                 e.port = 0;
330 
331         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
332                 ret = adtfn(set, &e, &ext, &ext, flags);
333                 return ip_set_eexist(ret, flags) ? 0 : ret;
334         }
335 
336         port = ntohs(e.port);
337         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
338         if (port > port_to)
339                 swap(port, port_to);
340 
341         if (retried)
342                 port = ntohs(h->next.port);
343         for (; port <= port_to; port++) {
344                 e.port = htons(port);
345                 ret = adtfn(set, &e, &ext, &ext, flags);
346 
347                 if (ret && !ip_set_eexist(ret, flags))
348                         return ret;
349                 else
350                         ret = 0;
351         }
352         return ret;
353 }
354 
355 static struct ip_set_type hash_ipportip_type __read_mostly = {
356         .name           = "hash:ip,port,ip",
357         .protocol       = IPSET_PROTOCOL,
358         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
359         .dimension      = IPSET_DIM_THREE,
360         .family         = NFPROTO_UNSPEC,
361         .revision_min   = IPSET_TYPE_REV_MIN,
362         .revision_max   = IPSET_TYPE_REV_MAX,
363         .create         = hash_ipportip_create,
364         .create_policy  = {
365                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
366                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
367                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
368                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
369                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
370                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
371         },
372         .adt_policy     = {
373                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
374                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
375                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
376                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
377                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
378                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
379                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
380                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
381                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
382                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
383                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
384                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING },
385         },
386         .me             = THIS_MODULE,
387 };
388 
389 static int __init
390 hash_ipportip_init(void)
391 {
392         return ip_set_type_register(&hash_ipportip_type);
393 }
394 
395 static void __exit
396 hash_ipportip_fini(void)
397 {
398         ip_set_type_unregister(&hash_ipportip_type);
399 }
400 
401 module_init(hash_ipportip_init);
402 module_exit(hash_ipportip_fini);
403 

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