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Linux/net/netfilter/ipset/ip_set_bitmap_ipmac.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
  3  *                         Patrick Schaaf <bof@bof.de>
  4  *                         Martin Josefsson <gandalf@wlug.westbo.se>
  5  */
  6 
  7 /* Kernel module implementing an IP set type: the bitmap:ip,mac type */
  8 
  9 #include <linux/module.h>
 10 #include <linux/ip.h>
 11 #include <linux/etherdevice.h>
 12 #include <linux/skbuff.h>
 13 #include <linux/errno.h>
 14 #include <linux/if_ether.h>
 15 #include <linux/netlink.h>
 16 #include <linux/jiffies.h>
 17 #include <linux/timer.h>
 18 #include <net/netlink.h>
 19 
 20 #include <linux/netfilter/ipset/pfxlen.h>
 21 #include <linux/netfilter/ipset/ip_set.h>
 22 #include <linux/netfilter/ipset/ip_set_bitmap.h>
 23 
 24 #define IPSET_TYPE_REV_MIN      0
 25 /*                              1          Counter support added */
 26 /*                              2          Comment support added */
 27 #define IPSET_TYPE_REV_MAX      3       /* skbinfo support added */
 28 
 29 MODULE_LICENSE("GPL");
 30 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
 31 IP_SET_MODULE_DESC("bitmap:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
 32 MODULE_ALIAS("ip_set_bitmap:ip,mac");
 33 
 34 #define MTYPE           bitmap_ipmac
 35 #define HOST_MASK       32
 36 #define IP_SET_BITMAP_STORED_TIMEOUT
 37 
 38 enum {
 39         MAC_UNSET,              /* element is set, without MAC */
 40         MAC_FILLED,             /* element is set with MAC */
 41 };
 42 
 43 /* Type structure */
 44 struct bitmap_ipmac {
 45         void *members;          /* the set members */
 46         u32 first_ip;           /* host byte order, included in range */
 47         u32 last_ip;            /* host byte order, included in range */
 48         u32 elements;           /* number of max elements in the set */
 49         size_t memsize;         /* members size */
 50         struct timer_list gc;   /* garbage collector */
 51         struct ip_set *set;     /* attached to this ip_set */
 52         unsigned char extensions[0]     /* MAC + data extensions */
 53                 __aligned(__alignof__(u64));
 54 };
 55 
 56 /* ADT structure for generic function args */
 57 struct bitmap_ipmac_adt_elem {
 58         unsigned char ether[ETH_ALEN] __aligned(2);
 59         u16 id;
 60         u16 add_mac;
 61 };
 62 
 63 struct bitmap_ipmac_elem {
 64         unsigned char ether[ETH_ALEN];
 65         unsigned char filled;
 66 } __aligned(__alignof__(u64));
 67 
 68 static inline u32
 69 ip_to_id(const struct bitmap_ipmac *m, u32 ip)
 70 {
 71         return ip - m->first_ip;
 72 }
 73 
 74 #define get_elem(extensions, id, dsize)         \
 75         (struct bitmap_ipmac_elem *)(extensions + (id) * (dsize))
 76 
 77 #define get_const_elem(extensions, id, dsize)   \
 78         (const struct bitmap_ipmac_elem *)(extensions + (id) * (dsize))
 79 
 80 /* Common functions */
 81 
 82 static inline int
 83 bitmap_ipmac_do_test(const struct bitmap_ipmac_adt_elem *e,
 84                      const struct bitmap_ipmac *map, size_t dsize)
 85 {
 86         const struct bitmap_ipmac_elem *elem;
 87 
 88         if (!test_bit(e->id, map->members))
 89                 return 0;
 90         elem = get_const_elem(map->extensions, e->id, dsize);
 91         if (e->add_mac && elem->filled == MAC_FILLED)
 92                 return ether_addr_equal(e->ether, elem->ether);
 93         /* Trigger kernel to fill out the ethernet address */
 94         return -EAGAIN;
 95 }
 96 
 97 static inline int
 98 bitmap_ipmac_gc_test(u16 id, const struct bitmap_ipmac *map, size_t dsize)
 99 {
100         const struct bitmap_ipmac_elem *elem;
101 
102         if (!test_bit(id, map->members))
103                 return 0;
104         elem = get_const_elem(map->extensions, id, dsize);
105         /* Timer not started for the incomplete elements */
106         return elem->filled == MAC_FILLED;
107 }
108 
109 static inline int
110 bitmap_ipmac_is_filled(const struct bitmap_ipmac_elem *elem)
111 {
112         return elem->filled == MAC_FILLED;
113 }
114 
115 static inline int
116 bitmap_ipmac_add_timeout(unsigned long *timeout,
117                          const struct bitmap_ipmac_adt_elem *e,
118                          const struct ip_set_ext *ext, struct ip_set *set,
119                          struct bitmap_ipmac *map, int mode)
120 {
121         u32 t = ext->timeout;
122 
123         if (mode == IPSET_ADD_START_STORED_TIMEOUT) {
124                 if (t == set->timeout)
125                         /* Timeout was not specified, get stored one */
126                         t = *timeout;
127                 ip_set_timeout_set(timeout, t);
128         } else {
129                 /* If MAC is unset yet, we store plain timeout value
130                  * because the timer is not activated yet
131                  * and we can reuse it later when MAC is filled out,
132                  * possibly by the kernel
133                  */
134                 if (e->add_mac)
135                         ip_set_timeout_set(timeout, t);
136                 else
137                         *timeout = t;
138         }
139         return 0;
140 }
141 
142 static inline int
143 bitmap_ipmac_do_add(const struct bitmap_ipmac_adt_elem *e,
144                     struct bitmap_ipmac *map, u32 flags, size_t dsize)
145 {
146         struct bitmap_ipmac_elem *elem;
147 
148         elem = get_elem(map->extensions, e->id, dsize);
149         if (test_bit(e->id, map->members)) {
150                 if (elem->filled == MAC_FILLED) {
151                         if (e->add_mac &&
152                             (flags & IPSET_FLAG_EXIST) &&
153                             !ether_addr_equal(e->ether, elem->ether)) {
154                                 /* memcpy isn't atomic */
155                                 clear_bit(e->id, map->members);
156                                 smp_mb__after_atomic();
157                                 ether_addr_copy(elem->ether, e->ether);
158                         }
159                         return IPSET_ADD_FAILED;
160                 } else if (!e->add_mac)
161                         /* Already added without ethernet address */
162                         return IPSET_ADD_FAILED;
163                 /* Fill the MAC address and trigger the timer activation */
164                 clear_bit(e->id, map->members);
165                 smp_mb__after_atomic();
166                 ether_addr_copy(elem->ether, e->ether);
167                 elem->filled = MAC_FILLED;
168                 return IPSET_ADD_START_STORED_TIMEOUT;
169         } else if (e->add_mac) {
170                 /* We can store MAC too */
171                 ether_addr_copy(elem->ether, e->ether);
172                 elem->filled = MAC_FILLED;
173                 return 0;
174         }
175         elem->filled = MAC_UNSET;
176         /* MAC is not stored yet, don't start timer */
177         return IPSET_ADD_STORE_PLAIN_TIMEOUT;
178 }
179 
180 static inline int
181 bitmap_ipmac_do_del(const struct bitmap_ipmac_adt_elem *e,
182                     struct bitmap_ipmac *map)
183 {
184         return !test_and_clear_bit(e->id, map->members);
185 }
186 
187 static inline int
188 bitmap_ipmac_do_list(struct sk_buff *skb, const struct bitmap_ipmac *map,
189                      u32 id, size_t dsize)
190 {
191         const struct bitmap_ipmac_elem *elem =
192                 get_const_elem(map->extensions, id, dsize);
193 
194         return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
195                                htonl(map->first_ip + id)) ||
196                (elem->filled == MAC_FILLED &&
197                 nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, elem->ether));
198 }
199 
200 static inline int
201 bitmap_ipmac_do_head(struct sk_buff *skb, const struct bitmap_ipmac *map)
202 {
203         return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) ||
204                nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip));
205 }
206 
207 static int
208 bitmap_ipmac_kadt(struct ip_set *set, const struct sk_buff *skb,
209                   const struct xt_action_param *par,
210                   enum ipset_adt adt, struct ip_set_adt_opt *opt)
211 {
212         struct bitmap_ipmac *map = set->data;
213         ipset_adtfn adtfn = set->variant->adt[adt];
214         struct bitmap_ipmac_adt_elem e = { .id = 0, .add_mac = 1 };
215         struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
216         u32 ip;
217 
218         ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
219         if (ip < map->first_ip || ip > map->last_ip)
220                 return -IPSET_ERR_BITMAP_RANGE;
221 
222         /* Backward compatibility: we don't check the second flag */
223         if (skb_mac_header(skb) < skb->head ||
224             (skb_mac_header(skb) + ETH_HLEN) > skb->data)
225                 return -EINVAL;
226 
227         e.id = ip_to_id(map, ip);
228 
229         if (opt->flags & IPSET_DIM_TWO_SRC)
230                 ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
231         else
232                 ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
233 
234         if (is_zero_ether_addr(e.ether))
235                 return -EINVAL;
236 
237         return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
238 }
239 
240 static int
241 bitmap_ipmac_uadt(struct ip_set *set, struct nlattr *tb[],
242                   enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
243 {
244         const struct bitmap_ipmac *map = set->data;
245         ipset_adtfn adtfn = set->variant->adt[adt];
246         struct bitmap_ipmac_adt_elem e = { .id = 0 };
247         struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
248         u32 ip = 0;
249         int ret = 0;
250 
251         if (tb[IPSET_ATTR_LINENO])
252                 *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
253 
254         if (unlikely(!tb[IPSET_ATTR_IP]))
255                 return -IPSET_ERR_PROTOCOL;
256 
257         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &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         if (ip < map->first_ip || ip > map->last_ip)
266                 return -IPSET_ERR_BITMAP_RANGE;
267 
268         e.id = ip_to_id(map, ip);
269         if (tb[IPSET_ATTR_ETHER]) {
270                 if (nla_len(tb[IPSET_ATTR_ETHER]) != ETH_ALEN)
271                         return -IPSET_ERR_PROTOCOL;
272                 memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
273                 e.add_mac = 1;
274         }
275         ret = adtfn(set, &e, &ext, &ext, flags);
276 
277         return ip_set_eexist(ret, flags) ? 0 : ret;
278 }
279 
280 static bool
281 bitmap_ipmac_same_set(const struct ip_set *a, const struct ip_set *b)
282 {
283         const struct bitmap_ipmac *x = a->data;
284         const struct bitmap_ipmac *y = b->data;
285 
286         return x->first_ip == y->first_ip &&
287                x->last_ip == y->last_ip &&
288                a->timeout == b->timeout &&
289                a->extensions == b->extensions;
290 }
291 
292 /* Plain variant */
293 
294 #include "ip_set_bitmap_gen.h"
295 
296 /* Create bitmap:ip,mac type of sets */
297 
298 static bool
299 init_map_ipmac(struct ip_set *set, struct bitmap_ipmac *map,
300                u32 first_ip, u32 last_ip, u32 elements)
301 {
302         map->members = ip_set_alloc(map->memsize);
303         if (!map->members)
304                 return false;
305         map->first_ip = first_ip;
306         map->last_ip = last_ip;
307         map->elements = elements;
308         set->timeout = IPSET_NO_TIMEOUT;
309 
310         map->set = set;
311         set->data = map;
312         set->family = NFPROTO_IPV4;
313 
314         return true;
315 }
316 
317 static int
318 bitmap_ipmac_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
319                     u32 flags)
320 {
321         u32 first_ip = 0, last_ip = 0;
322         u64 elements;
323         struct bitmap_ipmac *map;
324         int ret;
325 
326         if (unlikely(!tb[IPSET_ATTR_IP] ||
327                      !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
328                      !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
329                 return -IPSET_ERR_PROTOCOL;
330 
331         ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
332         if (ret)
333                 return ret;
334 
335         if (tb[IPSET_ATTR_IP_TO]) {
336                 ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
337                 if (ret)
338                         return ret;
339                 if (first_ip > last_ip)
340                         swap(first_ip, last_ip);
341         } else if (tb[IPSET_ATTR_CIDR]) {
342                 u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
343 
344                 if (cidr >= HOST_MASK)
345                         return -IPSET_ERR_INVALID_CIDR;
346                 ip_set_mask_from_to(first_ip, last_ip, cidr);
347         } else {
348                 return -IPSET_ERR_PROTOCOL;
349         }
350 
351         elements = (u64)last_ip - first_ip + 1;
352 
353         if (elements > IPSET_BITMAP_MAX_RANGE + 1)
354                 return -IPSET_ERR_BITMAP_RANGE_SIZE;
355 
356         set->dsize = ip_set_elem_len(set, tb,
357                                      sizeof(struct bitmap_ipmac_elem),
358                                      __alignof__(struct bitmap_ipmac_elem));
359         map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
360         if (!map)
361                 return -ENOMEM;
362 
363         map->memsize = bitmap_bytes(0, elements - 1);
364         set->variant = &bitmap_ipmac;
365         if (!init_map_ipmac(set, map, first_ip, last_ip, elements)) {
366                 kfree(map);
367                 return -ENOMEM;
368         }
369         if (tb[IPSET_ATTR_TIMEOUT]) {
370                 set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
371                 bitmap_ipmac_gc_init(set, bitmap_ipmac_gc);
372         }
373         return 0;
374 }
375 
376 static struct ip_set_type bitmap_ipmac_type = {
377         .name           = "bitmap:ip,mac",
378         .protocol       = IPSET_PROTOCOL,
379         .features       = IPSET_TYPE_IP | IPSET_TYPE_MAC,
380         .dimension      = IPSET_DIM_TWO,
381         .family         = NFPROTO_IPV4,
382         .revision_min   = IPSET_TYPE_REV_MIN,
383         .revision_max   = IPSET_TYPE_REV_MAX,
384         .create         = bitmap_ipmac_create,
385         .create_policy  = {
386                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
387                 [IPSET_ATTR_IP_TO]      = { .type = NLA_NESTED },
388                 [IPSET_ATTR_CIDR]       = { .type = NLA_U8 },
389                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
390                 [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
391         },
392         .adt_policy     = {
393                 [IPSET_ATTR_IP]         = { .type = NLA_NESTED },
394                 [IPSET_ATTR_ETHER]      = { .type = NLA_BINARY,
395                                             .len  = ETH_ALEN },
396                 [IPSET_ATTR_TIMEOUT]    = { .type = NLA_U32 },
397                 [IPSET_ATTR_LINENO]     = { .type = NLA_U32 },
398                 [IPSET_ATTR_BYTES]      = { .type = NLA_U64 },
399                 [IPSET_ATTR_PACKETS]    = { .type = NLA_U64 },
400                 [IPSET_ATTR_COMMENT]    = { .type = NLA_NUL_STRING,
401                                             .len  = IPSET_MAX_COMMENT_SIZE },
402                 [IPSET_ATTR_SKBMARK]    = { .type = NLA_U64 },
403                 [IPSET_ATTR_SKBPRIO]    = { .type = NLA_U32 },
404                 [IPSET_ATTR_SKBQUEUE]   = { .type = NLA_U16 },
405         },
406         .me             = THIS_MODULE,
407 };
408 
409 static int __init
410 bitmap_ipmac_init(void)
411 {
412         return ip_set_type_register(&bitmap_ipmac_type);
413 }
414 
415 static void __exit
416 bitmap_ipmac_fini(void)
417 {
418         rcu_barrier();
419         ip_set_type_unregister(&bitmap_ipmac_type);
420 }
421 
422 module_init(bitmap_ipmac_init);
423 module_exit(bitmap_ipmac_fini);
424 

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