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Linux/include/linux/netfilter/ipset/ip_set.h

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  1 /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
  2  *                         Patrick Schaaf <bof@bof.de>
  3  *                         Martin Josefsson <gandalf@wlug.westbo.se>
  4  * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #ifndef _IP_SET_H
 11 #define _IP_SET_H
 12 
 13 #include <linux/ip.h>
 14 #include <linux/ipv6.h>
 15 #include <linux/netlink.h>
 16 #include <linux/netfilter.h>
 17 #include <linux/netfilter/x_tables.h>
 18 #include <linux/stringify.h>
 19 #include <linux/vmalloc.h>
 20 #include <net/netlink.h>
 21 #include <uapi/linux/netfilter/ipset/ip_set.h>
 22 
 23 #define _IP_SET_MODULE_DESC(a, b, c)            \
 24         MODULE_DESCRIPTION(a " type of IP sets, revisions " b "-" c)
 25 #define IP_SET_MODULE_DESC(a, b, c)             \
 26         _IP_SET_MODULE_DESC(a, __stringify(b), __stringify(c))
 27 
 28 /* Set features */
 29 enum ip_set_feature {
 30         IPSET_TYPE_IP_FLAG = 0,
 31         IPSET_TYPE_IP = (1 << IPSET_TYPE_IP_FLAG),
 32         IPSET_TYPE_PORT_FLAG = 1,
 33         IPSET_TYPE_PORT = (1 << IPSET_TYPE_PORT_FLAG),
 34         IPSET_TYPE_MAC_FLAG = 2,
 35         IPSET_TYPE_MAC = (1 << IPSET_TYPE_MAC_FLAG),
 36         IPSET_TYPE_IP2_FLAG = 3,
 37         IPSET_TYPE_IP2 = (1 << IPSET_TYPE_IP2_FLAG),
 38         IPSET_TYPE_NAME_FLAG = 4,
 39         IPSET_TYPE_NAME = (1 << IPSET_TYPE_NAME_FLAG),
 40         IPSET_TYPE_IFACE_FLAG = 5,
 41         IPSET_TYPE_IFACE = (1 << IPSET_TYPE_IFACE_FLAG),
 42         IPSET_TYPE_MARK_FLAG = 6,
 43         IPSET_TYPE_MARK = (1 << IPSET_TYPE_MARK_FLAG),
 44         IPSET_TYPE_NOMATCH_FLAG = 7,
 45         IPSET_TYPE_NOMATCH = (1 << IPSET_TYPE_NOMATCH_FLAG),
 46         /* Strictly speaking not a feature, but a flag for dumping:
 47          * this settype must be dumped last */
 48         IPSET_DUMP_LAST_FLAG = 8,
 49         IPSET_DUMP_LAST = (1 << IPSET_DUMP_LAST_FLAG),
 50 };
 51 
 52 /* Set extensions */
 53 enum ip_set_extension {
 54         IPSET_EXT_BIT_TIMEOUT = 0,
 55         IPSET_EXT_TIMEOUT = (1 << IPSET_EXT_BIT_TIMEOUT),
 56         IPSET_EXT_BIT_COUNTER = 1,
 57         IPSET_EXT_COUNTER = (1 << IPSET_EXT_BIT_COUNTER),
 58         IPSET_EXT_BIT_COMMENT = 2,
 59         IPSET_EXT_COMMENT = (1 << IPSET_EXT_BIT_COMMENT),
 60         IPSET_EXT_BIT_SKBINFO = 3,
 61         IPSET_EXT_SKBINFO = (1 << IPSET_EXT_BIT_SKBINFO),
 62         /* Mark set with an extension which needs to call destroy */
 63         IPSET_EXT_BIT_DESTROY = 7,
 64         IPSET_EXT_DESTROY = (1 << IPSET_EXT_BIT_DESTROY),
 65 };
 66 
 67 #define SET_WITH_TIMEOUT(s)     ((s)->extensions & IPSET_EXT_TIMEOUT)
 68 #define SET_WITH_COUNTER(s)     ((s)->extensions & IPSET_EXT_COUNTER)
 69 #define SET_WITH_COMMENT(s)     ((s)->extensions & IPSET_EXT_COMMENT)
 70 #define SET_WITH_SKBINFO(s)     ((s)->extensions & IPSET_EXT_SKBINFO)
 71 #define SET_WITH_FORCEADD(s)    ((s)->flags & IPSET_CREATE_FLAG_FORCEADD)
 72 
 73 /* Extension id, in size order */
 74 enum ip_set_ext_id {
 75         IPSET_EXT_ID_COUNTER = 0,
 76         IPSET_EXT_ID_TIMEOUT,
 77         IPSET_EXT_ID_SKBINFO,
 78         IPSET_EXT_ID_COMMENT,
 79         IPSET_EXT_ID_MAX,
 80 };
 81 
 82 /* Extension type */
 83 struct ip_set_ext_type {
 84         /* Destroy extension private data (can be NULL) */
 85         void (*destroy)(void *ext);
 86         enum ip_set_extension type;
 87         enum ipset_cadt_flags flag;
 88         /* Size and minimal alignment */
 89         u8 len;
 90         u8 align;
 91 };
 92 
 93 extern const struct ip_set_ext_type ip_set_extensions[];
 94 
 95 struct ip_set_ext {
 96         u64 packets;
 97         u64 bytes;
 98         u32 timeout;
 99         u32 skbmark;
100         u32 skbmarkmask;
101         u32 skbprio;
102         u16 skbqueue;
103         char *comment;
104 };
105 
106 struct ip_set_counter {
107         atomic64_t bytes;
108         atomic64_t packets;
109 };
110 
111 struct ip_set_comment_rcu {
112         struct rcu_head rcu;
113         char str[0];
114 };
115 
116 struct ip_set_comment {
117         struct ip_set_comment_rcu __rcu *c;
118 };
119 
120 struct ip_set_skbinfo {
121         u32 skbmark;
122         u32 skbmarkmask;
123         u32 skbprio;
124         u16 skbqueue;
125 };
126 
127 struct ip_set;
128 
129 #define ext_timeout(e, s)       \
130 ((unsigned long *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_TIMEOUT]))
131 #define ext_counter(e, s)       \
132 ((struct ip_set_counter *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_COUNTER]))
133 #define ext_comment(e, s)       \
134 ((struct ip_set_comment *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_COMMENT]))
135 #define ext_skbinfo(e, s)       \
136 ((struct ip_set_skbinfo *)(((void *)(e)) + (s)->offset[IPSET_EXT_ID_SKBINFO]))
137 
138 typedef int (*ipset_adtfn)(struct ip_set *set, void *value,
139                            const struct ip_set_ext *ext,
140                            struct ip_set_ext *mext, u32 cmdflags);
141 
142 /* Kernel API function options */
143 struct ip_set_adt_opt {
144         u8 family;              /* Actual protocol family */
145         u8 dim;                 /* Dimension of match/target */
146         u8 flags;               /* Direction and negation flags */
147         u32 cmdflags;           /* Command-like flags */
148         struct ip_set_ext ext;  /* Extensions */
149 };
150 
151 /* Set type, variant-specific part */
152 struct ip_set_type_variant {
153         /* Kernelspace: test/add/del entries
154          *              returns negative error code,
155          *                      zero for no match/success to add/delete
156          *                      positive for matching element */
157         int (*kadt)(struct ip_set *set, const struct sk_buff *skb,
158                     const struct xt_action_param *par,
159                     enum ipset_adt adt, struct ip_set_adt_opt *opt);
160 
161         /* Userspace: test/add/del entries
162          *              returns negative error code,
163          *                      zero for no match/success to add/delete
164          *                      positive for matching element */
165         int (*uadt)(struct ip_set *set, struct nlattr *tb[],
166                     enum ipset_adt adt, u32 *lineno, u32 flags, bool retried);
167 
168         /* Low level add/del/test functions */
169         ipset_adtfn adt[IPSET_ADT_MAX];
170 
171         /* When adding entries and set is full, try to resize the set */
172         int (*resize)(struct ip_set *set, bool retried);
173         /* Destroy the set */
174         void (*destroy)(struct ip_set *set);
175         /* Flush the elements */
176         void (*flush)(struct ip_set *set);
177         /* Expire entries before listing */
178         void (*expire)(struct ip_set *set);
179         /* List set header data */
180         int (*head)(struct ip_set *set, struct sk_buff *skb);
181         /* List elements */
182         int (*list)(const struct ip_set *set, struct sk_buff *skb,
183                     struct netlink_callback *cb);
184         /* Keep listing private when resizing runs parallel */
185         void (*uref)(struct ip_set *set, struct netlink_callback *cb,
186                      bool start);
187 
188         /* Return true if "b" set is the same as "a"
189          * according to the create set parameters */
190         bool (*same_set)(const struct ip_set *a, const struct ip_set *b);
191 };
192 
193 /* The core set type structure */
194 struct ip_set_type {
195         struct list_head list;
196 
197         /* Typename */
198         char name[IPSET_MAXNAMELEN];
199         /* Protocol version */
200         u8 protocol;
201         /* Set type dimension */
202         u8 dimension;
203         /*
204          * Supported family: may be NFPROTO_UNSPEC for both
205          * NFPROTO_IPV4/NFPROTO_IPV6.
206          */
207         u8 family;
208         /* Type revisions */
209         u8 revision_min, revision_max;
210         /* Set features to control swapping */
211         u16 features;
212 
213         /* Create set */
214         int (*create)(struct net *net, struct ip_set *set,
215                       struct nlattr *tb[], u32 flags);
216 
217         /* Attribute policies */
218         const struct nla_policy create_policy[IPSET_ATTR_CREATE_MAX + 1];
219         const struct nla_policy adt_policy[IPSET_ATTR_ADT_MAX + 1];
220 
221         /* Set this to THIS_MODULE if you are a module, otherwise NULL */
222         struct module *me;
223 };
224 
225 /* register and unregister set type */
226 extern int ip_set_type_register(struct ip_set_type *set_type);
227 extern void ip_set_type_unregister(struct ip_set_type *set_type);
228 
229 /* A generic IP set */
230 struct ip_set {
231         /* The name of the set */
232         char name[IPSET_MAXNAMELEN];
233         /* Lock protecting the set data */
234         spinlock_t lock;
235         /* References to the set */
236         u32 ref;
237         /* References to the set for netlink events like dump,
238          * ref can be swapped out by ip_set_swap
239          */
240         u32 ref_netlink;
241         /* The core set type */
242         struct ip_set_type *type;
243         /* The type variant doing the real job */
244         const struct ip_set_type_variant *variant;
245         /* The actual INET family of the set */
246         u8 family;
247         /* The type revision */
248         u8 revision;
249         /* Extensions */
250         u8 extensions;
251         /* Create flags */
252         u8 flags;
253         /* Default timeout value, if enabled */
254         u32 timeout;
255         /* Element data size */
256         size_t dsize;
257         /* Offsets to extensions in elements */
258         size_t offset[IPSET_EXT_ID_MAX];
259         /* The type specific data */
260         void *data;
261 };
262 
263 static inline void
264 ip_set_ext_destroy(struct ip_set *set, void *data)
265 {
266         /* Check that the extension is enabled for the set and
267          * call it's destroy function for its extension part in data.
268          */
269         if (SET_WITH_COMMENT(set))
270                 ip_set_extensions[IPSET_EXT_ID_COMMENT].destroy(
271                         ext_comment(data, set));
272 }
273 
274 static inline int
275 ip_set_put_flags(struct sk_buff *skb, struct ip_set *set)
276 {
277         u32 cadt_flags = 0;
278 
279         if (SET_WITH_TIMEOUT(set))
280                 if (unlikely(nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
281                                            htonl(set->timeout))))
282                         return -EMSGSIZE;
283         if (SET_WITH_COUNTER(set))
284                 cadt_flags |= IPSET_FLAG_WITH_COUNTERS;
285         if (SET_WITH_COMMENT(set))
286                 cadt_flags |= IPSET_FLAG_WITH_COMMENT;
287         if (SET_WITH_SKBINFO(set))
288                 cadt_flags |= IPSET_FLAG_WITH_SKBINFO;
289         if (SET_WITH_FORCEADD(set))
290                 cadt_flags |= IPSET_FLAG_WITH_FORCEADD;
291 
292         if (!cadt_flags)
293                 return 0;
294         return nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(cadt_flags));
295 }
296 
297 static inline void
298 ip_set_add_bytes(u64 bytes, struct ip_set_counter *counter)
299 {
300         atomic64_add((long long)bytes, &(counter)->bytes);
301 }
302 
303 static inline void
304 ip_set_add_packets(u64 packets, struct ip_set_counter *counter)
305 {
306         atomic64_add((long long)packets, &(counter)->packets);
307 }
308 
309 static inline u64
310 ip_set_get_bytes(const struct ip_set_counter *counter)
311 {
312         return (u64)atomic64_read(&(counter)->bytes);
313 }
314 
315 static inline u64
316 ip_set_get_packets(const struct ip_set_counter *counter)
317 {
318         return (u64)atomic64_read(&(counter)->packets);
319 }
320 
321 static inline void
322 ip_set_update_counter(struct ip_set_counter *counter,
323                       const struct ip_set_ext *ext,
324                       struct ip_set_ext *mext, u32 flags)
325 {
326         if (ext->packets != ULLONG_MAX &&
327             !(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) {
328                 ip_set_add_bytes(ext->bytes, counter);
329                 ip_set_add_packets(ext->packets, counter);
330         }
331         if (flags & IPSET_FLAG_MATCH_COUNTERS) {
332                 mext->packets = ip_set_get_packets(counter);
333                 mext->bytes = ip_set_get_bytes(counter);
334         }
335 }
336 
337 static inline void
338 ip_set_get_skbinfo(struct ip_set_skbinfo *skbinfo,
339                       const struct ip_set_ext *ext,
340                       struct ip_set_ext *mext, u32 flags)
341 {
342                 mext->skbmark = skbinfo->skbmark;
343                 mext->skbmarkmask = skbinfo->skbmarkmask;
344                 mext->skbprio = skbinfo->skbprio;
345                 mext->skbqueue = skbinfo->skbqueue;
346 }
347 static inline bool
348 ip_set_put_skbinfo(struct sk_buff *skb, struct ip_set_skbinfo *skbinfo)
349 {
350         /* Send nonzero parameters only */
351         return ((skbinfo->skbmark || skbinfo->skbmarkmask) &&
352                 nla_put_net64(skb, IPSET_ATTR_SKBMARK,
353                               cpu_to_be64((u64)skbinfo->skbmark << 32 |
354                                           skbinfo->skbmarkmask),
355                               IPSET_ATTR_PAD)) ||
356                (skbinfo->skbprio &&
357                 nla_put_net32(skb, IPSET_ATTR_SKBPRIO,
358                               cpu_to_be32(skbinfo->skbprio))) ||
359                (skbinfo->skbqueue &&
360                 nla_put_net16(skb, IPSET_ATTR_SKBQUEUE,
361                              cpu_to_be16(skbinfo->skbqueue)));
362 }
363 
364 static inline void
365 ip_set_init_skbinfo(struct ip_set_skbinfo *skbinfo,
366                     const struct ip_set_ext *ext)
367 {
368         skbinfo->skbmark = ext->skbmark;
369         skbinfo->skbmarkmask = ext->skbmarkmask;
370         skbinfo->skbprio = ext->skbprio;
371         skbinfo->skbqueue = ext->skbqueue;
372 }
373 
374 static inline bool
375 ip_set_put_counter(struct sk_buff *skb, struct ip_set_counter *counter)
376 {
377         return nla_put_net64(skb, IPSET_ATTR_BYTES,
378                              cpu_to_be64(ip_set_get_bytes(counter)),
379                              IPSET_ATTR_PAD) ||
380                nla_put_net64(skb, IPSET_ATTR_PACKETS,
381                              cpu_to_be64(ip_set_get_packets(counter)),
382                              IPSET_ATTR_PAD);
383 }
384 
385 static inline void
386 ip_set_init_counter(struct ip_set_counter *counter,
387                     const struct ip_set_ext *ext)
388 {
389         if (ext->bytes != ULLONG_MAX)
390                 atomic64_set(&(counter)->bytes, (long long)(ext->bytes));
391         if (ext->packets != ULLONG_MAX)
392                 atomic64_set(&(counter)->packets, (long long)(ext->packets));
393 }
394 
395 /* Netlink CB args */
396 enum {
397         IPSET_CB_NET = 0,       /* net namespace */
398         IPSET_CB_DUMP,          /* dump single set/all sets */
399         IPSET_CB_INDEX,         /* set index */
400         IPSET_CB_PRIVATE,       /* set private data */
401         IPSET_CB_ARG0,          /* type specific */
402         IPSET_CB_ARG1,
403 };
404 
405 /* register and unregister set references */
406 extern ip_set_id_t ip_set_get_byname(struct net *net,
407                                      const char *name, struct ip_set **set);
408 extern void ip_set_put_byindex(struct net *net, ip_set_id_t index);
409 extern const char *ip_set_name_byindex(struct net *net, ip_set_id_t index);
410 extern ip_set_id_t ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index);
411 extern void ip_set_nfnl_put(struct net *net, ip_set_id_t index);
412 
413 /* API for iptables set match, and SET target */
414 
415 extern int ip_set_add(ip_set_id_t id, const struct sk_buff *skb,
416                       const struct xt_action_param *par,
417                       struct ip_set_adt_opt *opt);
418 extern int ip_set_del(ip_set_id_t id, const struct sk_buff *skb,
419                       const struct xt_action_param *par,
420                       struct ip_set_adt_opt *opt);
421 extern int ip_set_test(ip_set_id_t id, const struct sk_buff *skb,
422                        const struct xt_action_param *par,
423                        struct ip_set_adt_opt *opt);
424 
425 /* Utility functions */
426 extern void *ip_set_alloc(size_t size);
427 extern void ip_set_free(void *members);
428 extern int ip_set_get_ipaddr4(struct nlattr *nla,  __be32 *ipaddr);
429 extern int ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr);
430 extern size_t ip_set_elem_len(struct ip_set *set, struct nlattr *tb[],
431                               size_t len, size_t align);
432 extern int ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[],
433                                  struct ip_set_ext *ext);
434 
435 static inline int
436 ip_set_get_hostipaddr4(struct nlattr *nla, u32 *ipaddr)
437 {
438         __be32 ip;
439         int ret = ip_set_get_ipaddr4(nla, &ip);
440 
441         if (ret)
442                 return ret;
443         *ipaddr = ntohl(ip);
444         return 0;
445 }
446 
447 /* Ignore IPSET_ERR_EXIST errors if asked to do so? */
448 static inline bool
449 ip_set_eexist(int ret, u32 flags)
450 {
451         return ret == -IPSET_ERR_EXIST && (flags & IPSET_FLAG_EXIST);
452 }
453 
454 /* Match elements marked with nomatch */
455 static inline bool
456 ip_set_enomatch(int ret, u32 flags, enum ipset_adt adt, struct ip_set *set)
457 {
458         return adt == IPSET_TEST &&
459                (set->type->features & IPSET_TYPE_NOMATCH) &&
460                ((flags >> 16) & IPSET_FLAG_NOMATCH) &&
461                (ret > 0 || ret == -ENOTEMPTY);
462 }
463 
464 /* Check the NLA_F_NET_BYTEORDER flag */
465 static inline bool
466 ip_set_attr_netorder(struct nlattr *tb[], int type)
467 {
468         return tb[type] && (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
469 }
470 
471 static inline bool
472 ip_set_optattr_netorder(struct nlattr *tb[], int type)
473 {
474         return !tb[type] || (tb[type]->nla_type & NLA_F_NET_BYTEORDER);
475 }
476 
477 /* Useful converters */
478 static inline u32
479 ip_set_get_h32(const struct nlattr *attr)
480 {
481         return ntohl(nla_get_be32(attr));
482 }
483 
484 static inline u16
485 ip_set_get_h16(const struct nlattr *attr)
486 {
487         return ntohs(nla_get_be16(attr));
488 }
489 
490 #define ipset_nest_start(skb, attr) nla_nest_start(skb, attr | NLA_F_NESTED)
491 #define ipset_nest_end(skb, start)  nla_nest_end(skb, start)
492 
493 static inline int nla_put_ipaddr4(struct sk_buff *skb, int type, __be32 ipaddr)
494 {
495         struct nlattr *__nested = ipset_nest_start(skb, type);
496         int ret;
497 
498         if (!__nested)
499                 return -EMSGSIZE;
500         ret = nla_put_in_addr(skb, IPSET_ATTR_IPADDR_IPV4, ipaddr);
501         if (!ret)
502                 ipset_nest_end(skb, __nested);
503         return ret;
504 }
505 
506 static inline int nla_put_ipaddr6(struct sk_buff *skb, int type,
507                                   const struct in6_addr *ipaddrptr)
508 {
509         struct nlattr *__nested = ipset_nest_start(skb, type);
510         int ret;
511 
512         if (!__nested)
513                 return -EMSGSIZE;
514         ret = nla_put_in6_addr(skb, IPSET_ATTR_IPADDR_IPV6, ipaddrptr);
515         if (!ret)
516                 ipset_nest_end(skb, __nested);
517         return ret;
518 }
519 
520 /* Get address from skbuff */
521 static inline __be32
522 ip4addr(const struct sk_buff *skb, bool src)
523 {
524         return src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
525 }
526 
527 static inline void
528 ip4addrptr(const struct sk_buff *skb, bool src, __be32 *addr)
529 {
530         *addr = src ? ip_hdr(skb)->saddr : ip_hdr(skb)->daddr;
531 }
532 
533 static inline void
534 ip6addrptr(const struct sk_buff *skb, bool src, struct in6_addr *addr)
535 {
536         memcpy(addr, src ? &ipv6_hdr(skb)->saddr : &ipv6_hdr(skb)->daddr,
537                sizeof(*addr));
538 }
539 
540 /* Calculate the bytes required to store the inclusive range of a-b */
541 static inline int
542 bitmap_bytes(u32 a, u32 b)
543 {
544         return 4 * ((((b - a + 8) / 8) + 3) / 4);
545 }
546 
547 #include <linux/netfilter/ipset/ip_set_timeout.h>
548 #include <linux/netfilter/ipset/ip_set_comment.h>
549 
550 int
551 ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set,
552                       const void *e, bool active);
553 
554 #define IP_SET_INIT_KEXT(skb, opt, set)                 \
555         { .bytes = (skb)->len, .packets = 1,            \
556           .timeout = ip_set_adt_opt_timeout(opt, set) }
557 
558 #define IP_SET_INIT_UEXT(set)                           \
559         { .bytes = ULLONG_MAX, .packets = ULLONG_MAX,   \
560           .timeout = (set)->timeout }
561 
562 #define IPSET_CONCAT(a, b)              a##b
563 #define IPSET_TOKEN(a, b)               IPSET_CONCAT(a, b)
564 
565 #endif /*_IP_SET_H */
566 

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