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TOMOYO Linux Cross Reference
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 REVISION_MIN    0
 28 /*                      1    SCTP and UDPLITE support added */
 29 #define REVISION_MAX    2 /* Counters support added */
 30 
 31 MODULE_LICENSE("GPL");
 32 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
 33 IP_SET_MODULE_DESC("hash:ip,port,ip", REVISION_MIN, REVISION_MAX);
 34 MODULE_ALIAS("ip_set_hash:ip,port,ip");
 35 
 36 /* Type specific function prefix */
 37 #define HTYPE           hash_ipportip
 38 
 39 /* IPv4 variants */
 40 
 41 /* Member elements  */
 42 struct hash_ipportip4_elem {
 43         __be32 ip;
 44         __be32 ip2;
 45         __be16 port;
 46         u8 proto;
 47         u8 padding;
 48 };
 49 
 50 struct hash_ipportip4t_elem {
 51         __be32 ip;
 52         __be32 ip2;
 53         __be16 port;
 54         u8 proto;
 55         u8 padding;
 56         unsigned long timeout;
 57 };
 58 
 59 struct hash_ipportip4c_elem {
 60         __be32 ip;
 61         __be32 ip2;
 62         __be16 port;
 63         u8 proto;
 64         u8 padding;
 65         struct ip_set_counter counter;
 66 };
 67 
 68 struct hash_ipportip4ct_elem {
 69         __be32 ip;
 70         __be32 ip2;
 71         __be16 port;
 72         u8 proto;
 73         u8 padding;
 74         struct ip_set_counter counter;
 75         unsigned long timeout;
 76 };
 77 
 78 static inline bool
 79 hash_ipportip4_data_equal(const struct hash_ipportip4_elem *ip1,
 80                           const struct hash_ipportip4_elem *ip2,
 81                           u32 *multi)
 82 {
 83         return ip1->ip == ip2->ip &&
 84                ip1->ip2 == ip2->ip2 &&
 85                ip1->port == ip2->port &&
 86                ip1->proto == ip2->proto;
 87 }
 88 
 89 static bool
 90 hash_ipportip4_data_list(struct sk_buff *skb,
 91                        const struct hash_ipportip4_elem *data)
 92 {
 93         if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
 94             nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
 95             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
 96             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
 97                 goto nla_put_failure;
 98         return 0;
 99 
100 nla_put_failure:
101         return 1;
102 }
103 
104 static inline void
105 hash_ipportip4_data_next(struct hash_ipportip4_elem *next,
106                          const struct hash_ipportip4_elem *d)
107 {
108         next->ip = d->ip;
109         next->port = d->port;
110 }
111 
112 /* Common functions */
113 #define MTYPE           hash_ipportip4
114 #define PF              4
115 #define HOST_MASK       32
116 #include "ip_set_hash_gen.h"
117 
118 static int
119 hash_ipportip4_kadt(struct ip_set *set, const struct sk_buff *skb,
120                     const struct xt_action_param *par,
121                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
122 {
123         const struct hash_ipportip *h = set->data;
124         ipset_adtfn adtfn = set->variant->adt[adt];
125         struct hash_ipportip4_elem e = { };
126         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
127 
128         if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
129                                  &e.port, &e.proto))
130                 return -EINVAL;
131 
132         ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
133         ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
134         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
135 }
136 
137 static int
138 hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
139                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
140 {
141         const struct hash_ipportip *h = set->data;
142         ipset_adtfn adtfn = set->variant->adt[adt];
143         struct hash_ipportip4_elem e = { };
144         struct ip_set_ext ext = IP_SET_INIT_UEXT(h);
145         u32 ip, ip_to, p = 0, port, port_to;
146         bool with_ports = false;
147         int ret;
148 
149         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
150                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
151                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
152                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
153                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
154                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
155                 return -IPSET_ERR_PROTOCOL;
156 
157         if (tb[IPSET_ATTR_LINENO])
158                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
159 
160         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP], &e.ip) ||
161               ip_set_get_extensions(set, tb, &ext);
162         if (ret)
163                 return ret;
164 
165         ret = ip_set_get_ipaddr4(tb[IPSET_ATTR_IP2], &e.ip2);
166         if (ret)
167                 return ret;
168 
169         if (tb[IPSET_ATTR_PORT])
170                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
171         else
172                 return -IPSET_ERR_PROTOCOL;
173 
174         if (tb[IPSET_ATTR_PROTO]) {
175                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
176                 with_ports = ip_set_proto_with_ports(e.proto);
177 
178                 if (e.proto == 0)
179                         return -IPSET_ERR_INVALID_PROTO;
180         } else
181                 return -IPSET_ERR_MISSING_PROTO;
182 
183         if (!(with_ports || e.proto == IPPROTO_ICMP))
184                 e.port = 0;
185 
186         if (adt == IPSET_TEST ||
187             !(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR] ||
188               tb[IPSET_ATTR_PORT_TO])) {
189                 ret = adtfn(set, &e, &ext, &ext, flags);
190                 return ip_set_eexist(ret, flags) ? 0 : ret;
191         }
192 
193         ip_to = ip = ntohl(e.ip);
194         if (tb[IPSET_ATTR_IP_TO]) {
195                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
196                 if (ret)
197                         return ret;
198                 if (ip > ip_to)
199                         swap(ip, ip_to);
200         } else if (tb[IPSET_ATTR_CIDR]) {
201                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
202 
203                 if (!cidr || cidr > 32)
204                         return -IPSET_ERR_INVALID_CIDR;
205                 ip_set_mask_from_to(ip, ip_to, cidr);
206         }
207 
208         port_to = port = ntohs(e.port);
209         if (with_ports && tb[IPSET_ATTR_PORT_TO]) {
210                 port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
211                 if (port > port_to)
212                         swap(port, port_to);
213         }
214 
215         if (retried)
216                 ip = ntohl(h->next.ip);
217         for (; !before(ip_to, ip); ip++) {
218                 p = retried && ip == ntohl(h->next.ip) ? ntohs(h->next.port)
219                                                        : port;
220                 for (; p <= port_to; p++) {
221                         e.ip = htonl(ip);
222                         e.port = htons(p);
223                         ret = adtfn(set, &e, &ext, &ext, flags);
224 
225                         if (ret && !ip_set_eexist(ret, flags))
226                                 return ret;
227                         else
228                                 ret = 0;
229                 }
230         }
231         return ret;
232 }
233 
234 /* IPv6 variants */
235 
236 struct hash_ipportip6_elem {
237         union nf_inet_addr ip;
238         union nf_inet_addr ip2;
239         __be16 port;
240         u8 proto;
241         u8 padding;
242 };
243 
244 struct hash_ipportip6t_elem {
245         union nf_inet_addr ip;
246         union nf_inet_addr ip2;
247         __be16 port;
248         u8 proto;
249         u8 padding;
250         unsigned long timeout;
251 };
252 
253 struct hash_ipportip6c_elem {
254         union nf_inet_addr ip;
255         union nf_inet_addr ip2;
256         __be16 port;
257         u8 proto;
258         u8 padding;
259         struct ip_set_counter counter;
260 };
261 
262 struct hash_ipportip6ct_elem {
263         union nf_inet_addr ip;
264         union nf_inet_addr ip2;
265         __be16 port;
266         u8 proto;
267         u8 padding;
268         struct ip_set_counter counter;
269         unsigned long timeout;
270 };
271 
272 /* Common functions */
273 
274 static inline bool
275 hash_ipportip6_data_equal(const struct hash_ipportip6_elem *ip1,
276                           const struct hash_ipportip6_elem *ip2,
277                           u32 *multi)
278 {
279         return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
280                ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
281                ip1->port == ip2->port &&
282                ip1->proto == ip2->proto;
283 }
284 
285 static bool
286 hash_ipportip6_data_list(struct sk_buff *skb,
287                          const struct hash_ipportip6_elem *data)
288 {
289         if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
290             nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
291             nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
292             nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto))
293                 goto nla_put_failure;
294         return 0;
295 
296 nla_put_failure:
297         return 1;
298 }
299 
300 static inline void
301 hash_ipportip6_data_next(struct hash_ipportip4_elem *next,
302                          const struct hash_ipportip6_elem *d)
303 {
304         next->port = d->port;
305 }
306 
307 #undef MTYPE
308 #undef PF
309 #undef HOST_MASK
310 
311 #define MTYPE           hash_ipportip6
312 #define PF              6
313 #define HOST_MASK       128
314 #define IP_SET_EMIT_CREATE
315 #include "ip_set_hash_gen.h"
316 
317 static int
318 hash_ipportip6_kadt(struct ip_set *set, const struct sk_buff *skb,
319                     const struct xt_action_param *par,
320                     enum ipset_adt adt, struct ip_set_adt_opt *opt)
321 {
322         const struct hash_ipportip *h = set->data;
323         ipset_adtfn adtfn = set->variant->adt[adt];
324         struct hash_ipportip6_elem e = { };
325         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, h);
326 
327         if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
328                                  &e.port, &e.proto))
329                 return -EINVAL;
330 
331         ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
332         ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
333         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
334 }
335 
336 static int
337 hash_ipportip6_uadt(struct ip_set *set, struct nlattr *tb[],
338                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
339 {
340         const struct hash_ipportip *h = set->data;
341         ipset_adtfn adtfn = set->variant->adt[adt];
342         struct hash_ipportip6_elem e = { };
343         struct ip_set_ext ext = IP_SET_INIT_UEXT(h);
344         u32 port, port_to;
345         bool with_ports = false;
346         int ret;
347 
348         if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
349                      !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
350                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
351                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
352                      !ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
353                      !ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
354                      tb[IPSET_ATTR_IP_TO] ||
355                      tb[IPSET_ATTR_CIDR]))
356                 return -IPSET_ERR_PROTOCOL;
357 
358         if (tb[IPSET_ATTR_LINENO])
359                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
360 
361         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
362               ip_set_get_extensions(set, tb, &ext);
363         if (ret)
364                 return ret;
365 
366         ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
367         if (ret)
368                 return ret;
369 
370         if (tb[IPSET_ATTR_PORT])
371                 e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
372         else
373                 return -IPSET_ERR_PROTOCOL;
374 
375         if (tb[IPSET_ATTR_PROTO]) {
376                 e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
377                 with_ports = ip_set_proto_with_ports(e.proto);
378 
379                 if (e.proto == 0)
380                         return -IPSET_ERR_INVALID_PROTO;
381         } else
382                 return -IPSET_ERR_MISSING_PROTO;
383 
384         if (!(with_ports || e.proto == IPPROTO_ICMPV6))
385                 e.port = 0;
386 
387         if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
388                 ret = adtfn(set, &e, &ext, &ext, flags);
389                 return ip_set_eexist(ret, flags) ? 0 : ret;
390         }
391 
392         port = ntohs(e.port);
393         port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
394         if (port > port_to)
395                 swap(port, port_to);
396 
397         if (retried)
398                 port = ntohs(h->next.port);
399         for (; port <= port_to; port++) {
400                 e.port = htons(port);
401                 ret = adtfn(set, &e, &ext, &ext, flags);
402 
403                 if (ret && !ip_set_eexist(ret, flags))
404                         return ret;
405                 else
406                         ret = 0;
407         }
408         return ret;
409 }
410 
411 static struct ip_set_type hash_ipportip_type __read_mostly = {
412         .name           = "hash:ip,port,ip",
413         .protocol       = IPSET_PROTOCOL,
414         .features       = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2,
415         .dimension      = IPSET_DIM_THREE,
416         .family         = NFPROTO_UNSPEC,
417         .revision_min   = REVISION_MIN,
418         .revision_max   = REVISION_MAX,
419         .create         = hash_ipportip_create,
420         .create_policy  = {
421                 [IPSET_ATTR_HASHSIZE]   = { .type = NLA_U32 },
422                 [IPSET_ATTR_MAXELEM]    = { .type = NLA_U32 },
423                 [IPSET_ATTR_PROBES]     = { .type = NLA_U8 },
424                 [IPSET_ATTR_RESIZE]     = { .type = NLA_U8  },
425                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
426                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
427         },
428         .adt_policy     = {
429                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
430                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
431                 [IPSET_ATTR_IP2]        = { .type = NLA_NESTED },
432                 [IPSET_ATTR_PORT]       = { .type = NLA_U16 },
433                 [IPSET_ATTR_PORT_TO]    = { .type = NLA_U16 },
434                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
435                 [IPSET_ATTR_PROTO]      = { .type = NLA_U8 },
436                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
437                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
438                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
439                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
440         },
441         .me             = THIS_MODULE,
442 };
443 
444 static int __init
445 hash_ipportip_init(void)
446 {
447         return ip_set_type_register(&hash_ipportip_type);
448 }
449 
450 static void __exit
451 hash_ipportip_fini(void)
452 {
453         ip_set_type_unregister(&hash_ipportip_type);
454 }
455 
456 module_init(hash_ipportip_init);
457 module_exit(hash_ipportip_fini);
458 

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