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TOMOYO Linux Cross Reference
Linux/net/ipv6/addrlabel.c

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  1 /*
  2  * IPv6 Address Label subsystem
  3  * for the IPv6 "Default" Source Address Selection
  4  *
  5  * Copyright (C)2007 USAGI/WIDE Project
  6  */
  7 /*
  8  * Author:
  9  *      YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/list.h>
 14 #include <linux/rcupdate.h>
 15 #include <linux/in6.h>
 16 #include <linux/slab.h>
 17 #include <net/addrconf.h>
 18 #include <linux/if_addrlabel.h>
 19 #include <linux/netlink.h>
 20 #include <linux/rtnetlink.h>
 21 
 22 #if 0
 23 #define ADDRLABEL(x...) printk(x)
 24 #else
 25 #define ADDRLABEL(x...) do { ; } while (0)
 26 #endif
 27 
 28 /*
 29  * Policy Table
 30  */
 31 struct ip6addrlbl_entry {
 32         possible_net_t lbl_net;
 33         struct in6_addr prefix;
 34         int prefixlen;
 35         int ifindex;
 36         int addrtype;
 37         u32 label;
 38         struct hlist_node list;
 39         atomic_t refcnt;
 40         struct rcu_head rcu;
 41 };
 42 
 43 static struct ip6addrlbl_table
 44 {
 45         struct hlist_head head;
 46         spinlock_t lock;
 47         u32 seq;
 48 } ip6addrlbl_table;
 49 
 50 static inline
 51 struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl)
 52 {
 53         return read_pnet(&lbl->lbl_net);
 54 }
 55 
 56 /*
 57  * Default policy table (RFC6724 + extensions)
 58  *
 59  * prefix               addr_type       label
 60  * -------------------------------------------------------------------------
 61  * ::1/128              LOOPBACK        0
 62  * ::/0                 N/A             1
 63  * 2002::/16            N/A             2
 64  * ::/96                COMPATv4        3
 65  * ::ffff:0:0/96        V4MAPPED        4
 66  * fc00::/7             N/A             5               ULA (RFC 4193)
 67  * 2001::/32            N/A             6               Teredo (RFC 4380)
 68  * 2001:10::/28         N/A             7               ORCHID (RFC 4843)
 69  * fec0::/10            N/A             11              Site-local
 70  *                                                      (deprecated by RFC3879)
 71  * 3ffe::/16            N/A             12              6bone
 72  *
 73  * Note: 0xffffffff is used if we do not have any policies.
 74  * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
 75  */
 76 
 77 #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
 78 
 79 static const __net_initconst struct ip6addrlbl_init_table
 80 {
 81         const struct in6_addr *prefix;
 82         int prefixlen;
 83         u32 label;
 84 } ip6addrlbl_init_table[] = {
 85         {       /* ::/0 */
 86                 .prefix = &in6addr_any,
 87                 .label = 1,
 88         }, {    /* fc00::/7 */
 89                 .prefix = &(struct in6_addr){ { { 0xfc } } } ,
 90                 .prefixlen = 7,
 91                 .label = 5,
 92         }, {    /* fec0::/10 */
 93                 .prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } },
 94                 .prefixlen = 10,
 95                 .label = 11,
 96         }, {    /* 2002::/16 */
 97                 .prefix = &(struct in6_addr){ { { 0x20, 0x02 } } },
 98                 .prefixlen = 16,
 99                 .label = 2,
100         }, {    /* 3ffe::/16 */
101                 .prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } },
102                 .prefixlen = 16,
103                 .label = 12,
104         }, {    /* 2001::/32 */
105                 .prefix = &(struct in6_addr){ { { 0x20, 0x01 } } },
106                 .prefixlen = 32,
107                 .label = 6,
108         }, {    /* 2001:10::/28 */
109                 .prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } },
110                 .prefixlen = 28,
111                 .label = 7,
112         }, {    /* ::ffff:0:0 */
113                 .prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } },
114                 .prefixlen = 96,
115                 .label = 4,
116         }, {    /* ::/96 */
117                 .prefix = &in6addr_any,
118                 .prefixlen = 96,
119                 .label = 3,
120         }, {    /* ::1/128 */
121                 .prefix = &in6addr_loopback,
122                 .prefixlen = 128,
123                 .label = 0,
124         }
125 };
126 
127 /* Object management */
128 static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p)
129 {
130         kfree(p);
131 }
132 
133 static void ip6addrlbl_free_rcu(struct rcu_head *h)
134 {
135         ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu));
136 }
137 
138 static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p)
139 {
140         return atomic_inc_not_zero(&p->refcnt);
141 }
142 
143 static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p)
144 {
145         if (atomic_dec_and_test(&p->refcnt))
146                 call_rcu(&p->rcu, ip6addrlbl_free_rcu);
147 }
148 
149 /* Find label */
150 static bool __ip6addrlbl_match(struct net *net,
151                                const struct ip6addrlbl_entry *p,
152                                const struct in6_addr *addr,
153                                int addrtype, int ifindex)
154 {
155         if (!net_eq(ip6addrlbl_net(p), net))
156                 return false;
157         if (p->ifindex && p->ifindex != ifindex)
158                 return false;
159         if (p->addrtype && p->addrtype != addrtype)
160                 return false;
161         if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
162                 return false;
163         return true;
164 }
165 
166 static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
167                                                   const struct in6_addr *addr,
168                                                   int type, int ifindex)
169 {
170         struct ip6addrlbl_entry *p;
171         hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) {
172                 if (__ip6addrlbl_match(net, p, addr, type, ifindex))
173                         return p;
174         }
175         return NULL;
176 }
177 
178 u32 ipv6_addr_label(struct net *net,
179                     const struct in6_addr *addr, int type, int ifindex)
180 {
181         u32 label;
182         struct ip6addrlbl_entry *p;
183 
184         type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
185 
186         rcu_read_lock();
187         p = __ipv6_addr_label(net, addr, type, ifindex);
188         label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
189         rcu_read_unlock();
190 
191         ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
192                   __func__, addr, type, ifindex, label);
193 
194         return label;
195 }
196 
197 /* allocate one entry */
198 static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net,
199                                                  const struct in6_addr *prefix,
200                                                  int prefixlen, int ifindex,
201                                                  u32 label)
202 {
203         struct ip6addrlbl_entry *newp;
204         int addrtype;
205 
206         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
207                   __func__, prefix, prefixlen, ifindex, (unsigned int)label);
208 
209         addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK);
210 
211         switch (addrtype) {
212         case IPV6_ADDR_MAPPED:
213                 if (prefixlen > 96)
214                         return ERR_PTR(-EINVAL);
215                 if (prefixlen < 96)
216                         addrtype = 0;
217                 break;
218         case IPV6_ADDR_COMPATv4:
219                 if (prefixlen != 96)
220                         addrtype = 0;
221                 break;
222         case IPV6_ADDR_LOOPBACK:
223                 if (prefixlen != 128)
224                         addrtype = 0;
225                 break;
226         }
227 
228         newp = kmalloc(sizeof(*newp), GFP_KERNEL);
229         if (!newp)
230                 return ERR_PTR(-ENOMEM);
231 
232         ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
233         newp->prefixlen = prefixlen;
234         newp->ifindex = ifindex;
235         newp->addrtype = addrtype;
236         newp->label = label;
237         INIT_HLIST_NODE(&newp->list);
238         write_pnet(&newp->lbl_net, net);
239         atomic_set(&newp->refcnt, 1);
240         return newp;
241 }
242 
243 /* add a label */
244 static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace)
245 {
246         struct hlist_node *n;
247         struct ip6addrlbl_entry *last = NULL, *p = NULL;
248         int ret = 0;
249 
250         ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp,
251                   replace);
252 
253         hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
254                 if (p->prefixlen == newp->prefixlen &&
255                     net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) &&
256                     p->ifindex == newp->ifindex &&
257                     ipv6_addr_equal(&p->prefix, &newp->prefix)) {
258                         if (!replace) {
259                                 ret = -EEXIST;
260                                 goto out;
261                         }
262                         hlist_replace_rcu(&p->list, &newp->list);
263                         ip6addrlbl_put(p);
264                         goto out;
265                 } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) ||
266                            (p->prefixlen < newp->prefixlen)) {
267                         hlist_add_before_rcu(&newp->list, &p->list);
268                         goto out;
269                 }
270                 last = p;
271         }
272         if (last)
273                 hlist_add_behind_rcu(&newp->list, &last->list);
274         else
275                 hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head);
276 out:
277         if (!ret)
278                 ip6addrlbl_table.seq++;
279         return ret;
280 }
281 
282 /* add a label */
283 static int ip6addrlbl_add(struct net *net,
284                           const struct in6_addr *prefix, int prefixlen,
285                           int ifindex, u32 label, int replace)
286 {
287         struct ip6addrlbl_entry *newp;
288         int ret = 0;
289 
290         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
291                   __func__, prefix, prefixlen, ifindex, (unsigned int)label,
292                   replace);
293 
294         newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label);
295         if (IS_ERR(newp))
296                 return PTR_ERR(newp);
297         spin_lock(&ip6addrlbl_table.lock);
298         ret = __ip6addrlbl_add(newp, replace);
299         spin_unlock(&ip6addrlbl_table.lock);
300         if (ret)
301                 ip6addrlbl_free(newp);
302         return ret;
303 }
304 
305 /* remove a label */
306 static int __ip6addrlbl_del(struct net *net,
307                             const struct in6_addr *prefix, int prefixlen,
308                             int ifindex)
309 {
310         struct ip6addrlbl_entry *p = NULL;
311         struct hlist_node *n;
312         int ret = -ESRCH;
313 
314         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
315                   __func__, prefix, prefixlen, ifindex);
316 
317         hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
318                 if (p->prefixlen == prefixlen &&
319                     net_eq(ip6addrlbl_net(p), net) &&
320                     p->ifindex == ifindex &&
321                     ipv6_addr_equal(&p->prefix, prefix)) {
322                         hlist_del_rcu(&p->list);
323                         ip6addrlbl_put(p);
324                         ret = 0;
325                         break;
326                 }
327         }
328         return ret;
329 }
330 
331 static int ip6addrlbl_del(struct net *net,
332                           const struct in6_addr *prefix, int prefixlen,
333                           int ifindex)
334 {
335         struct in6_addr prefix_buf;
336         int ret;
337 
338         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
339                   __func__, prefix, prefixlen, ifindex);
340 
341         ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
342         spin_lock(&ip6addrlbl_table.lock);
343         ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
344         spin_unlock(&ip6addrlbl_table.lock);
345         return ret;
346 }
347 
348 /* add default label */
349 static int __net_init ip6addrlbl_net_init(struct net *net)
350 {
351         int err = 0;
352         int i;
353 
354         ADDRLABEL(KERN_DEBUG "%s\n", __func__);
355 
356         for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
357                 int ret = ip6addrlbl_add(net,
358                                          ip6addrlbl_init_table[i].prefix,
359                                          ip6addrlbl_init_table[i].prefixlen,
360                                          0,
361                                          ip6addrlbl_init_table[i].label, 0);
362                 /* XXX: should we free all rules when we catch an error? */
363                 if (ret && (!err || err != -ENOMEM))
364                         err = ret;
365         }
366         return err;
367 }
368 
369 static void __net_exit ip6addrlbl_net_exit(struct net *net)
370 {
371         struct ip6addrlbl_entry *p = NULL;
372         struct hlist_node *n;
373 
374         /* Remove all labels belonging to the exiting net */
375         spin_lock(&ip6addrlbl_table.lock);
376         hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
377                 if (net_eq(ip6addrlbl_net(p), net)) {
378                         hlist_del_rcu(&p->list);
379                         ip6addrlbl_put(p);
380                 }
381         }
382         spin_unlock(&ip6addrlbl_table.lock);
383 }
384 
385 static struct pernet_operations ipv6_addr_label_ops = {
386         .init = ip6addrlbl_net_init,
387         .exit = ip6addrlbl_net_exit,
388 };
389 
390 int __init ipv6_addr_label_init(void)
391 {
392         spin_lock_init(&ip6addrlbl_table.lock);
393 
394         return register_pernet_subsys(&ipv6_addr_label_ops);
395 }
396 
397 void ipv6_addr_label_cleanup(void)
398 {
399         unregister_pernet_subsys(&ipv6_addr_label_ops);
400 }
401 
402 static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
403         [IFAL_ADDRESS]          = { .len = sizeof(struct in6_addr), },
404         [IFAL_LABEL]            = { .len = sizeof(u32), },
405 };
406 
407 static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh)
408 {
409         struct net *net = sock_net(skb->sk);
410         struct ifaddrlblmsg *ifal;
411         struct nlattr *tb[IFAL_MAX+1];
412         struct in6_addr *pfx;
413         u32 label;
414         int err = 0;
415 
416         err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
417         if (err < 0)
418                 return err;
419 
420         ifal = nlmsg_data(nlh);
421 
422         if (ifal->ifal_family != AF_INET6 ||
423             ifal->ifal_prefixlen > 128)
424                 return -EINVAL;
425 
426         if (!tb[IFAL_ADDRESS])
427                 return -EINVAL;
428         pfx = nla_data(tb[IFAL_ADDRESS]);
429 
430         if (!tb[IFAL_LABEL])
431                 return -EINVAL;
432         label = nla_get_u32(tb[IFAL_LABEL]);
433         if (label == IPV6_ADDR_LABEL_DEFAULT)
434                 return -EINVAL;
435 
436         switch (nlh->nlmsg_type) {
437         case RTM_NEWADDRLABEL:
438                 if (ifal->ifal_index &&
439                     !__dev_get_by_index(net, ifal->ifal_index))
440                         return -EINVAL;
441 
442                 err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
443                                      ifal->ifal_index, label,
444                                      nlh->nlmsg_flags & NLM_F_REPLACE);
445                 break;
446         case RTM_DELADDRLABEL:
447                 err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
448                                      ifal->ifal_index);
449                 break;
450         default:
451                 err = -EOPNOTSUPP;
452         }
453         return err;
454 }
455 
456 static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
457                               int prefixlen, int ifindex, u32 lseq)
458 {
459         struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
460         ifal->ifal_family = AF_INET6;
461         ifal->ifal_prefixlen = prefixlen;
462         ifal->ifal_flags = 0;
463         ifal->ifal_index = ifindex;
464         ifal->ifal_seq = lseq;
465 };
466 
467 static int ip6addrlbl_fill(struct sk_buff *skb,
468                            struct ip6addrlbl_entry *p,
469                            u32 lseq,
470                            u32 portid, u32 seq, int event,
471                            unsigned int flags)
472 {
473         struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
474                                          sizeof(struct ifaddrlblmsg), flags);
475         if (!nlh)
476                 return -EMSGSIZE;
477 
478         ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);
479 
480         if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 ||
481             nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
482                 nlmsg_cancel(skb, nlh);
483                 return -EMSGSIZE;
484         }
485 
486         nlmsg_end(skb, nlh);
487         return 0;
488 }
489 
490 static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
491 {
492         struct net *net = sock_net(skb->sk);
493         struct ip6addrlbl_entry *p;
494         int idx = 0, s_idx = cb->args[0];
495         int err;
496 
497         rcu_read_lock();
498         hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) {
499                 if (idx >= s_idx &&
500                     net_eq(ip6addrlbl_net(p), net)) {
501                         err = ip6addrlbl_fill(skb, p,
502                                               ip6addrlbl_table.seq,
503                                               NETLINK_CB(cb->skb).portid,
504                                               cb->nlh->nlmsg_seq,
505                                               RTM_NEWADDRLABEL,
506                                               NLM_F_MULTI);
507                         if (err < 0)
508                                 break;
509                 }
510                 idx++;
511         }
512         rcu_read_unlock();
513         cb->args[0] = idx;
514         return skb->len;
515 }
516 
517 static inline int ip6addrlbl_msgsize(void)
518 {
519         return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
520                 + nla_total_size(16)    /* IFAL_ADDRESS */
521                 + nla_total_size(4);    /* IFAL_LABEL */
522 }
523 
524 static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh)
525 {
526         struct net *net = sock_net(in_skb->sk);
527         struct ifaddrlblmsg *ifal;
528         struct nlattr *tb[IFAL_MAX+1];
529         struct in6_addr *addr;
530         u32 lseq;
531         int err = 0;
532         struct ip6addrlbl_entry *p;
533         struct sk_buff *skb;
534 
535         err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
536         if (err < 0)
537                 return err;
538 
539         ifal = nlmsg_data(nlh);
540 
541         if (ifal->ifal_family != AF_INET6 ||
542             ifal->ifal_prefixlen != 128)
543                 return -EINVAL;
544 
545         if (ifal->ifal_index &&
546             !__dev_get_by_index(net, ifal->ifal_index))
547                 return -EINVAL;
548 
549         if (!tb[IFAL_ADDRESS])
550                 return -EINVAL;
551         addr = nla_data(tb[IFAL_ADDRESS]);
552 
553         rcu_read_lock();
554         p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
555         if (p && ip6addrlbl_hold(p))
556                 p = NULL;
557         lseq = ip6addrlbl_table.seq;
558         rcu_read_unlock();
559 
560         if (!p) {
561                 err = -ESRCH;
562                 goto out;
563         }
564 
565         skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL);
566         if (!skb) {
567                 ip6addrlbl_put(p);
568                 return -ENOBUFS;
569         }
570 
571         err = ip6addrlbl_fill(skb, p, lseq,
572                               NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
573                               RTM_NEWADDRLABEL, 0);
574 
575         ip6addrlbl_put(p);
576 
577         if (err < 0) {
578                 WARN_ON(err == -EMSGSIZE);
579                 kfree_skb(skb);
580                 goto out;
581         }
582 
583         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
584 out:
585         return err;
586 }
587 
588 void __init ipv6_addr_label_rtnl_register(void)
589 {
590         __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel,
591                         NULL, NULL);
592         __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel,
593                         NULL, NULL);
594         __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get,
595                         ip6addrlbl_dump, NULL);
596 }
597 
598 

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