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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 {
 33 #ifdef CONFIG_NET_NS
 34         struct net *lbl_net;
 35 #endif
 36         struct in6_addr prefix;
 37         int prefixlen;
 38         int ifindex;
 39         int addrtype;
 40         u32 label;
 41         struct hlist_node list;
 42         atomic_t refcnt;
 43         struct rcu_head rcu;
 44 };
 45 
 46 static struct ip6addrlbl_table
 47 {
 48         struct hlist_head head;
 49         spinlock_t lock;
 50         u32 seq;
 51 } ip6addrlbl_table;
 52 
 53 static inline
 54 struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl)
 55 {
 56         return read_pnet(&lbl->lbl_net);
 57 }
 58 
 59 /*
 60  * Default policy table (RFC6724 + extensions)
 61  *
 62  * prefix               addr_type       label
 63  * -------------------------------------------------------------------------
 64  * ::1/128              LOOPBACK        0
 65  * ::/0                 N/A             1
 66  * 2002::/16            N/A             2
 67  * ::/96                COMPATv4        3
 68  * ::ffff:0:0/96        V4MAPPED        4
 69  * fc00::/7             N/A             5               ULA (RFC 4193)
 70  * 2001::/32            N/A             6               Teredo (RFC 4380)
 71  * 2001:10::/28         N/A             7               ORCHID (RFC 4843)
 72  * fec0::/10            N/A             11              Site-local
 73  *                                                      (deprecated by RFC3879)
 74  * 3ffe::/16            N/A             12              6bone
 75  *
 76  * Note: 0xffffffff is used if we do not have any policies.
 77  * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
 78  */
 79 
 80 #define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
 81 
 82 static const __net_initconst struct ip6addrlbl_init_table
 83 {
 84         const struct in6_addr *prefix;
 85         int prefixlen;
 86         u32 label;
 87 } ip6addrlbl_init_table[] = {
 88         {       /* ::/0 */
 89                 .prefix = &in6addr_any,
 90                 .label = 1,
 91         },{     /* fc00::/7 */
 92                 .prefix = &(struct in6_addr){{{ 0xfc }}},
 93                 .prefixlen = 7,
 94                 .label = 5,
 95         },{     /* fec0::/10 */
 96                 .prefix = &(struct in6_addr){{{ 0xfe, 0xc0 }}},
 97                 .prefixlen = 10,
 98                 .label = 11,
 99         },{     /* 2002::/16 */
100                 .prefix = &(struct in6_addr){{{ 0x20, 0x02 }}},
101                 .prefixlen = 16,
102                 .label = 2,
103         },{     /* 3ffe::/16 */
104                 .prefix = &(struct in6_addr){{{ 0x3f, 0xfe }}},
105                 .prefixlen = 16,
106                 .label = 12,
107         },{     /* 2001::/32 */
108                 .prefix = &(struct in6_addr){{{ 0x20, 0x01 }}},
109                 .prefixlen = 32,
110                 .label = 6,
111         },{     /* 2001:10::/28 */
112                 .prefix = &(struct in6_addr){{{ 0x20, 0x01, 0x00, 0x10 }}},
113                 .prefixlen = 28,
114                 .label = 7,
115         },{     /* ::ffff:0:0 */
116                 .prefix = &(struct in6_addr){{{ [10] = 0xff, [11] = 0xff }}},
117                 .prefixlen = 96,
118                 .label = 4,
119         },{     /* ::/96 */
120                 .prefix = &in6addr_any,
121                 .prefixlen = 96,
122                 .label = 3,
123         },{     /* ::1/128 */
124                 .prefix = &in6addr_loopback,
125                 .prefixlen = 128,
126                 .label = 0,
127         }
128 };
129 
130 /* Object management */
131 static inline void ip6addrlbl_free(struct ip6addrlbl_entry *p)
132 {
133 #ifdef CONFIG_NET_NS
134         release_net(p->lbl_net);
135 #endif
136         kfree(p);
137 }
138 
139 static void ip6addrlbl_free_rcu(struct rcu_head *h)
140 {
141         ip6addrlbl_free(container_of(h, struct ip6addrlbl_entry, rcu));
142 }
143 
144 static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p)
145 {
146         return atomic_inc_not_zero(&p->refcnt);
147 }
148 
149 static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p)
150 {
151         if (atomic_dec_and_test(&p->refcnt))
152                 call_rcu(&p->rcu, ip6addrlbl_free_rcu);
153 }
154 
155 /* Find label */
156 static bool __ip6addrlbl_match(struct net *net,
157                                const struct ip6addrlbl_entry *p,
158                                const struct in6_addr *addr,
159                                int addrtype, int ifindex)
160 {
161         if (!net_eq(ip6addrlbl_net(p), net))
162                 return false;
163         if (p->ifindex && p->ifindex != ifindex)
164                 return false;
165         if (p->addrtype && p->addrtype != addrtype)
166                 return false;
167         if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
168                 return false;
169         return true;
170 }
171 
172 static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
173                                                   const struct in6_addr *addr,
174                                                   int type, int ifindex)
175 {
176         struct ip6addrlbl_entry *p;
177         hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) {
178                 if (__ip6addrlbl_match(net, p, addr, type, ifindex))
179                         return p;
180         }
181         return NULL;
182 }
183 
184 u32 ipv6_addr_label(struct net *net,
185                     const struct in6_addr *addr, int type, int ifindex)
186 {
187         u32 label;
188         struct ip6addrlbl_entry *p;
189 
190         type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;
191 
192         rcu_read_lock();
193         p = __ipv6_addr_label(net, addr, type, ifindex);
194         label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
195         rcu_read_unlock();
196 
197         ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
198                   __func__, addr, type, ifindex, label);
199 
200         return label;
201 }
202 
203 /* allocate one entry */
204 static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net,
205                                                  const struct in6_addr *prefix,
206                                                  int prefixlen, int ifindex,
207                                                  u32 label)
208 {
209         struct ip6addrlbl_entry *newp;
210         int addrtype;
211 
212         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
213                   __func__, prefix, prefixlen, ifindex, (unsigned int)label);
214 
215         addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK);
216 
217         switch (addrtype) {
218         case IPV6_ADDR_MAPPED:
219                 if (prefixlen > 96)
220                         return ERR_PTR(-EINVAL);
221                 if (prefixlen < 96)
222                         addrtype = 0;
223                 break;
224         case IPV6_ADDR_COMPATv4:
225                 if (prefixlen != 96)
226                         addrtype = 0;
227                 break;
228         case IPV6_ADDR_LOOPBACK:
229                 if (prefixlen != 128)
230                         addrtype = 0;
231                 break;
232         }
233 
234         newp = kmalloc(sizeof(*newp), GFP_KERNEL);
235         if (!newp)
236                 return ERR_PTR(-ENOMEM);
237 
238         ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
239         newp->prefixlen = prefixlen;
240         newp->ifindex = ifindex;
241         newp->addrtype = addrtype;
242         newp->label = label;
243         INIT_HLIST_NODE(&newp->list);
244 #ifdef CONFIG_NET_NS
245         newp->lbl_net = hold_net(net);
246 #endif
247         atomic_set(&newp->refcnt, 1);
248         return newp;
249 }
250 
251 /* add a label */
252 static int __ip6addrlbl_add(struct ip6addrlbl_entry *newp, int replace)
253 {
254         struct hlist_node *n;
255         struct ip6addrlbl_entry *last = NULL, *p = NULL;
256         int ret = 0;
257 
258         ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp,
259                   replace);
260 
261         hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
262                 if (p->prefixlen == newp->prefixlen &&
263                     net_eq(ip6addrlbl_net(p), ip6addrlbl_net(newp)) &&
264                     p->ifindex == newp->ifindex &&
265                     ipv6_addr_equal(&p->prefix, &newp->prefix)) {
266                         if (!replace) {
267                                 ret = -EEXIST;
268                                 goto out;
269                         }
270                         hlist_replace_rcu(&p->list, &newp->list);
271                         ip6addrlbl_put(p);
272                         goto out;
273                 } else if ((p->prefixlen == newp->prefixlen && !p->ifindex) ||
274                            (p->prefixlen < newp->prefixlen)) {
275                         hlist_add_before_rcu(&newp->list, &p->list);
276                         goto out;
277                 }
278                 last = p;
279         }
280         if (last)
281                 hlist_add_after_rcu(&last->list, &newp->list);
282         else
283                 hlist_add_head_rcu(&newp->list, &ip6addrlbl_table.head);
284 out:
285         if (!ret)
286                 ip6addrlbl_table.seq++;
287         return ret;
288 }
289 
290 /* add a label */
291 static int ip6addrlbl_add(struct net *net,
292                           const struct in6_addr *prefix, int prefixlen,
293                           int ifindex, u32 label, int replace)
294 {
295         struct ip6addrlbl_entry *newp;
296         int ret = 0;
297 
298         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
299                   __func__, prefix, prefixlen, ifindex, (unsigned int)label,
300                   replace);
301 
302         newp = ip6addrlbl_alloc(net, prefix, prefixlen, ifindex, label);
303         if (IS_ERR(newp))
304                 return PTR_ERR(newp);
305         spin_lock(&ip6addrlbl_table.lock);
306         ret = __ip6addrlbl_add(newp, replace);
307         spin_unlock(&ip6addrlbl_table.lock);
308         if (ret)
309                 ip6addrlbl_free(newp);
310         return ret;
311 }
312 
313 /* remove a label */
314 static int __ip6addrlbl_del(struct net *net,
315                             const struct in6_addr *prefix, int prefixlen,
316                             int ifindex)
317 {
318         struct ip6addrlbl_entry *p = NULL;
319         struct hlist_node *n;
320         int ret = -ESRCH;
321 
322         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
323                   __func__, prefix, prefixlen, ifindex);
324 
325         hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
326                 if (p->prefixlen == prefixlen &&
327                     net_eq(ip6addrlbl_net(p), net) &&
328                     p->ifindex == ifindex &&
329                     ipv6_addr_equal(&p->prefix, prefix)) {
330                         hlist_del_rcu(&p->list);
331                         ip6addrlbl_put(p);
332                         ret = 0;
333                         break;
334                 }
335         }
336         return ret;
337 }
338 
339 static int ip6addrlbl_del(struct net *net,
340                           const struct in6_addr *prefix, int prefixlen,
341                           int ifindex)
342 {
343         struct in6_addr prefix_buf;
344         int ret;
345 
346         ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
347                   __func__, prefix, prefixlen, ifindex);
348 
349         ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
350         spin_lock(&ip6addrlbl_table.lock);
351         ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
352         spin_unlock(&ip6addrlbl_table.lock);
353         return ret;
354 }
355 
356 /* add default label */
357 static int __net_init ip6addrlbl_net_init(struct net *net)
358 {
359         int err = 0;
360         int i;
361 
362         ADDRLABEL(KERN_DEBUG "%s\n", __func__);
363 
364         for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
365                 int ret = ip6addrlbl_add(net,
366                                          ip6addrlbl_init_table[i].prefix,
367                                          ip6addrlbl_init_table[i].prefixlen,
368                                          0,
369                                          ip6addrlbl_init_table[i].label, 0);
370                 /* XXX: should we free all rules when we catch an error? */
371                 if (ret && (!err || err != -ENOMEM))
372                         err = ret;
373         }
374         return err;
375 }
376 
377 static void __net_exit ip6addrlbl_net_exit(struct net *net)
378 {
379         struct ip6addrlbl_entry *p = NULL;
380         struct hlist_node *n;
381 
382         /* Remove all labels belonging to the exiting net */
383         spin_lock(&ip6addrlbl_table.lock);
384         hlist_for_each_entry_safe(p, n, &ip6addrlbl_table.head, list) {
385                 if (net_eq(ip6addrlbl_net(p), net)) {
386                         hlist_del_rcu(&p->list);
387                         ip6addrlbl_put(p);
388                 }
389         }
390         spin_unlock(&ip6addrlbl_table.lock);
391 }
392 
393 static struct pernet_operations ipv6_addr_label_ops = {
394         .init = ip6addrlbl_net_init,
395         .exit = ip6addrlbl_net_exit,
396 };
397 
398 int __init ipv6_addr_label_init(void)
399 {
400         spin_lock_init(&ip6addrlbl_table.lock);
401 
402         return register_pernet_subsys(&ipv6_addr_label_ops);
403 }
404 
405 void ipv6_addr_label_cleanup(void)
406 {
407         unregister_pernet_subsys(&ipv6_addr_label_ops);
408 }
409 
410 static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
411         [IFAL_ADDRESS]          = { .len = sizeof(struct in6_addr), },
412         [IFAL_LABEL]            = { .len = sizeof(u32), },
413 };
414 
415 static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh)
416 {
417         struct net *net = sock_net(skb->sk);
418         struct ifaddrlblmsg *ifal;
419         struct nlattr *tb[IFAL_MAX+1];
420         struct in6_addr *pfx;
421         u32 label;
422         int err = 0;
423 
424         err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
425         if (err < 0)
426                 return err;
427 
428         ifal = nlmsg_data(nlh);
429 
430         if (ifal->ifal_family != AF_INET6 ||
431             ifal->ifal_prefixlen > 128)
432                 return -EINVAL;
433 
434         if (!tb[IFAL_ADDRESS])
435                 return -EINVAL;
436         pfx = nla_data(tb[IFAL_ADDRESS]);
437 
438         if (!tb[IFAL_LABEL])
439                 return -EINVAL;
440         label = nla_get_u32(tb[IFAL_LABEL]);
441         if (label == IPV6_ADDR_LABEL_DEFAULT)
442                 return -EINVAL;
443 
444         switch(nlh->nlmsg_type) {
445         case RTM_NEWADDRLABEL:
446                 if (ifal->ifal_index &&
447                     !__dev_get_by_index(net, ifal->ifal_index))
448                         return -EINVAL;
449 
450                 err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
451                                      ifal->ifal_index, label,
452                                      nlh->nlmsg_flags & NLM_F_REPLACE);
453                 break;
454         case RTM_DELADDRLABEL:
455                 err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
456                                      ifal->ifal_index);
457                 break;
458         default:
459                 err = -EOPNOTSUPP;
460         }
461         return err;
462 }
463 
464 static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
465                               int prefixlen, int ifindex, u32 lseq)
466 {
467         struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
468         ifal->ifal_family = AF_INET6;
469         ifal->ifal_prefixlen = prefixlen;
470         ifal->ifal_flags = 0;
471         ifal->ifal_index = ifindex;
472         ifal->ifal_seq = lseq;
473 };
474 
475 static int ip6addrlbl_fill(struct sk_buff *skb,
476                            struct ip6addrlbl_entry *p,
477                            u32 lseq,
478                            u32 portid, u32 seq, int event,
479                            unsigned int flags)
480 {
481         struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
482                                          sizeof(struct ifaddrlblmsg), flags);
483         if (!nlh)
484                 return -EMSGSIZE;
485 
486         ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);
487 
488         if (nla_put(skb, IFAL_ADDRESS, 16, &p->prefix) < 0 ||
489             nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
490                 nlmsg_cancel(skb, nlh);
491                 return -EMSGSIZE;
492         }
493 
494         return nlmsg_end(skb, nlh);
495 }
496 
497 static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
498 {
499         struct net *net = sock_net(skb->sk);
500         struct ip6addrlbl_entry *p;
501         int idx = 0, s_idx = cb->args[0];
502         int err;
503 
504         rcu_read_lock();
505         hlist_for_each_entry_rcu(p, &ip6addrlbl_table.head, list) {
506                 if (idx >= s_idx &&
507                     net_eq(ip6addrlbl_net(p), net)) {
508                         if ((err = ip6addrlbl_fill(skb, p,
509                                                    ip6addrlbl_table.seq,
510                                                    NETLINK_CB(cb->skb).portid,
511                                                    cb->nlh->nlmsg_seq,
512                                                    RTM_NEWADDRLABEL,
513                                                    NLM_F_MULTI)) <= 0)
514                                 break;
515                 }
516                 idx++;
517         }
518         rcu_read_unlock();
519         cb->args[0] = idx;
520         return skb->len;
521 }
522 
523 static inline int ip6addrlbl_msgsize(void)
524 {
525         return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
526                 + nla_total_size(16)    /* IFAL_ADDRESS */
527                 + nla_total_size(4);    /* IFAL_LABEL */
528 }
529 
530 static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh)
531 {
532         struct net *net = sock_net(in_skb->sk);
533         struct ifaddrlblmsg *ifal;
534         struct nlattr *tb[IFAL_MAX+1];
535         struct in6_addr *addr;
536         u32 lseq;
537         int err = 0;
538         struct ip6addrlbl_entry *p;
539         struct sk_buff *skb;
540 
541         err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy);
542         if (err < 0)
543                 return err;
544 
545         ifal = nlmsg_data(nlh);
546 
547         if (ifal->ifal_family != AF_INET6 ||
548             ifal->ifal_prefixlen != 128)
549                 return -EINVAL;
550 
551         if (ifal->ifal_index &&
552             !__dev_get_by_index(net, ifal->ifal_index))
553                 return -EINVAL;
554 
555         if (!tb[IFAL_ADDRESS])
556                 return -EINVAL;
557         addr = nla_data(tb[IFAL_ADDRESS]);
558 
559         rcu_read_lock();
560         p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
561         if (p && !ip6addrlbl_hold(p))
562                 p = NULL;
563         lseq = ip6addrlbl_table.seq;
564         rcu_read_unlock();
565 
566         if (!p) {
567                 err = -ESRCH;
568                 goto out;
569         }
570 
571         if (!(skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL))) {
572                 ip6addrlbl_put(p);
573                 return -ENOBUFS;
574         }
575 
576         err = ip6addrlbl_fill(skb, p, lseq,
577                               NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
578                               RTM_NEWADDRLABEL, 0);
579 
580         ip6addrlbl_put(p);
581 
582         if (err < 0) {
583                 WARN_ON(err == -EMSGSIZE);
584                 kfree_skb(skb);
585                 goto out;
586         }
587 
588         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
589 out:
590         return err;
591 }
592 
593 void __init ipv6_addr_label_rtnl_register(void)
594 {
595         __rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel,
596                         NULL, NULL);
597         __rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel,
598                         NULL, NULL);
599         __rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get,
600                         ip6addrlbl_dump, NULL);
601 }
602 
603 

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