This source file includes following definitions.
- rt6_uncached_list_add
- rt6_uncached_list_del
- rt6_uncached_list_flush_dev
- choose_neigh_daddr
- ip6_neigh_lookup
- ip6_dst_neigh_lookup
- ip6_confirm_neigh
- ip6_blackhole_mtu
- ip6_rt_blackhole_update_pmtu
- ip6_rt_blackhole_redirect
- rt6_info_init
- ip6_dst_alloc
- ip6_dst_destroy
- ip6_dst_ifdown
- __rt6_check_expired
- rt6_check_expired
- fib6_select_path
- __rt6_device_match
- __rt6_nh_dev_match
- rt6_nh_dev_match
- rt6_device_match
- rt6_probe_deferred
- rt6_probe
- rt6_probe
- rt6_check_neigh
- rt6_score_route
- find_match
- rt6_nh_find_match
- __find_rr_leaf
- find_rr_leaf
- rt6_select
- rt6_is_gw_or_nonexthop
- rt6_route_rcv
- ip6_rt_get_dev_rcu
- ip6_rt_type_to_error
- fib6_info_dst_flags
- ip6_rt_init_dst_reject
- ip6_rt_init_dst
- rt6_set_from
- ip6_rt_copy_init
- fib6_backtrack
- ip6_hold_safe
- ip6_create_rt_rcu
- ip6_pol_route_lookup
- ip6_route_lookup
- rt6_lookup
- __ip6_ins_rt
- ip6_ins_rt
- ip6_rt_cache_alloc
- ip6_rt_pcpu_alloc
- rt6_is_valid
- rt6_get_pcpu_route
- rt6_make_pcpu_route
- rt6_remove_exception
- rt6_exception_remove_oldest
- rt6_exception_hash
- __rt6_find_exception_spinlock
- __rt6_find_exception_rcu
- fib6_mtu
- fib6_nh_get_excptn_bucket
- fib6_nh_excptn_bucket_flushed
- fib6_nh_excptn_bucket_set_flushed
- rt6_insert_exception
- fib6_nh_flush_exceptions
- rt6_nh_flush_exceptions
- rt6_flush_exceptions
- rt6_find_cached_rt
- fib6_nh_remove_exception
- rt6_nh_remove_exception_rt
- rt6_remove_exception_rt
- fib6_nh_update_exception
- fib6_nh_find_match
- rt6_update_exception_stamp_rt
- rt6_mtu_change_route_allowed
- rt6_exceptions_update_pmtu
- fib6_nh_exceptions_clean_tohost
- rt6_age_examine_exception
- fib6_nh_age_exceptions
- rt6_nh_age_exceptions
- rt6_age_exceptions
- fib6_table_lookup
- ip6_pol_route
- ip6_pol_route_input
- ip6_route_input_lookup
- ip6_multipath_l3_keys
- rt6_multipath_hash
- ip6_route_input
- ip6_pol_route_output
- ip6_route_output_flags_noref
- ip6_route_output_flags
- ip6_blackhole_route
- fib6_check
- rt6_check
- rt6_dst_from_check
- ip6_dst_check
- ip6_negative_advice
- ip6_link_failure
- rt6_update_expires
- rt6_do_update_pmtu
- rt6_cache_allowed_for_pmtu
- __ip6_rt_update_pmtu
- ip6_rt_update_pmtu
- ip6_update_pmtu
- ip6_sk_update_pmtu
- ip6_sk_dst_store_flow
- ip6_redirect_nh_match
- fib6_nh_redirect_match
- __ip6_route_redirect
- ip6_route_redirect
- ip6_redirect
- ip6_redirect_no_header
- ip6_sk_redirect
- ip6_default_advmss
- ip6_mtu
- ip6_mtu_from_fib6
- icmp6_dst_alloc
- ip6_dst_gc
- ip6_nh_lookup_table
- ip6_route_check_nh_onlink
- ip6_route_check_nh
- ip6_validate_gw
- fib6_is_reject
- fib6_nh_init
- fib6_nh_release
- ip6_route_info_create
- ip6_route_add
- __ip6_del_rt
- ip6_del_rt
- __ip6_del_rt_siblings
- __ip6_del_cached_rt
- ip6_del_cached_rt
- fib6_nh_del_cached_rt
- ip6_del_cached_rt_nh
- ip6_route_del
- rt6_do_redirect
- rt6_get_route_info
- rt6_add_route_info
- rt6_get_dflt_router
- rt6_add_dflt_router
- __rt6_purge_dflt_routers
- rt6_purge_dflt_routers
- rtmsg_to_fib6_config
- ipv6_route_ioctl
- ip6_pkt_drop
- ip6_pkt_discard
- ip6_pkt_discard_out
- ip6_pkt_prohibit
- ip6_pkt_prohibit_out
- addrconf_f6i_alloc
- fib6_remove_prefsrc
- rt6_remove_prefsrc
- fib6_clean_tohost
- rt6_clean_tohost
- rt6_multipath_first_sibling
- rt6_is_dead
- rt6_multipath_total_weight
- rt6_upper_bound_set
- rt6_multipath_upper_bound_set
- rt6_multipath_rebalance
- fib6_ifup
- rt6_sync_up
- rt6_multipath_uses_dev
- rt6_multipath_flush
- rt6_multipath_dead_count
- rt6_multipath_nh_flags_set
- fib6_ifdown
- rt6_sync_down_dev
- rt6_disable_ip
- fib6_nh_mtu_change
- rt6_mtu_change_route
- rt6_mtu_change
- rtm_to_fib6_config
- ip6_route_info_append
- ip6_route_mpath_notify
- ip6_route_multipath_add
- ip6_route_multipath_del
- inet6_rtm_delroute
- inet6_rtm_newroute
- rt6_nh_nlmsg_size
- rt6_nlmsg_size
- rt6_fill_node_nexthop
- rt6_fill_node
- fib6_info_nh_uses_dev
- fib6_info_uses_dev
- rt6_nh_dump_exceptions
- rt6_dump_route
- inet6_rtm_valid_getroute_req
- inet6_rtm_getroute
- inet6_rt_notify
- fib6_rt_update
- ip6_route_dev_notify
- rt6_stats_seq_show
- ipv6_sysctl_rtcache_flush
- ipv6_route_sysctl_init
- ip6_route_net_init
- ip6_route_net_exit
- ip6_route_net_init_late
- ip6_route_net_exit_late
- ipv6_inetpeer_init
- ipv6_inetpeer_exit
- ip6_route_init_special_entries
- ip6_route_init
- ip6_route_cleanup
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23 #define pr_fmt(fmt) "IPv6: " fmt
24
25 #include <linux/capability.h>
26 #include <linux/errno.h>
27 #include <linux/export.h>
28 #include <linux/types.h>
29 #include <linux/times.h>
30 #include <linux/socket.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/route.h>
34 #include <linux/netdevice.h>
35 #include <linux/in6.h>
36 #include <linux/mroute6.h>
37 #include <linux/init.h>
38 #include <linux/if_arp.h>
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <linux/nsproxy.h>
42 #include <linux/slab.h>
43 #include <linux/jhash.h>
44 #include <net/net_namespace.h>
45 #include <net/snmp.h>
46 #include <net/ipv6.h>
47 #include <net/ip6_fib.h>
48 #include <net/ip6_route.h>
49 #include <net/ndisc.h>
50 #include <net/addrconf.h>
51 #include <net/tcp.h>
52 #include <linux/rtnetlink.h>
53 #include <net/dst.h>
54 #include <net/dst_metadata.h>
55 #include <net/xfrm.h>
56 #include <net/netevent.h>
57 #include <net/netlink.h>
58 #include <net/rtnh.h>
59 #include <net/lwtunnel.h>
60 #include <net/ip_tunnels.h>
61 #include <net/l3mdev.h>
62 #include <net/ip.h>
63 #include <linux/uaccess.h>
64
65 #ifdef CONFIG_SYSCTL
66 #include <linux/sysctl.h>
67 #endif
68
69 static int ip6_rt_type_to_error(u8 fib6_type);
70
71 #define CREATE_TRACE_POINTS
72 #include <trace/events/fib6.h>
73 EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
74 #undef CREATE_TRACE_POINTS
75
76 enum rt6_nud_state {
77 RT6_NUD_FAIL_HARD = -3,
78 RT6_NUD_FAIL_PROBE = -2,
79 RT6_NUD_FAIL_DO_RR = -1,
80 RT6_NUD_SUCCEED = 1
81 };
82
83 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
84 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
85 static unsigned int ip6_mtu(const struct dst_entry *dst);
86 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
87 static void ip6_dst_destroy(struct dst_entry *);
88 static void ip6_dst_ifdown(struct dst_entry *,
89 struct net_device *dev, int how);
90 static int ip6_dst_gc(struct dst_ops *ops);
91
92 static int ip6_pkt_discard(struct sk_buff *skb);
93 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
94 static int ip6_pkt_prohibit(struct sk_buff *skb);
95 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
96 static void ip6_link_failure(struct sk_buff *skb);
97 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb, u32 mtu,
99 bool confirm_neigh);
100 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
101 struct sk_buff *skb);
102 static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
103 int strict);
104 static size_t rt6_nlmsg_size(struct fib6_info *f6i);
105 static int rt6_fill_node(struct net *net, struct sk_buff *skb,
106 struct fib6_info *rt, struct dst_entry *dst,
107 struct in6_addr *dest, struct in6_addr *src,
108 int iif, int type, u32 portid, u32 seq,
109 unsigned int flags);
110 static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
111 const struct in6_addr *daddr,
112 const struct in6_addr *saddr);
113
114 #ifdef CONFIG_IPV6_ROUTE_INFO
115 static struct fib6_info *rt6_add_route_info(struct net *net,
116 const struct in6_addr *prefix, int prefixlen,
117 const struct in6_addr *gwaddr,
118 struct net_device *dev,
119 unsigned int pref);
120 static struct fib6_info *rt6_get_route_info(struct net *net,
121 const struct in6_addr *prefix, int prefixlen,
122 const struct in6_addr *gwaddr,
123 struct net_device *dev);
124 #endif
125
126 struct uncached_list {
127 spinlock_t lock;
128 struct list_head head;
129 };
130
131 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
132
133 void rt6_uncached_list_add(struct rt6_info *rt)
134 {
135 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
136
137 rt->rt6i_uncached_list = ul;
138
139 spin_lock_bh(&ul->lock);
140 list_add_tail(&rt->rt6i_uncached, &ul->head);
141 spin_unlock_bh(&ul->lock);
142 }
143
144 void rt6_uncached_list_del(struct rt6_info *rt)
145 {
146 if (!list_empty(&rt->rt6i_uncached)) {
147 struct uncached_list *ul = rt->rt6i_uncached_list;
148 struct net *net = dev_net(rt->dst.dev);
149
150 spin_lock_bh(&ul->lock);
151 list_del(&rt->rt6i_uncached);
152 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
153 spin_unlock_bh(&ul->lock);
154 }
155 }
156
157 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
158 {
159 struct net_device *loopback_dev = net->loopback_dev;
160 int cpu;
161
162 if (dev == loopback_dev)
163 return;
164
165 for_each_possible_cpu(cpu) {
166 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
167 struct rt6_info *rt;
168
169 spin_lock_bh(&ul->lock);
170 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
171 struct inet6_dev *rt_idev = rt->rt6i_idev;
172 struct net_device *rt_dev = rt->dst.dev;
173
174 if (rt_idev->dev == dev) {
175 rt->rt6i_idev = in6_dev_get(loopback_dev);
176 in6_dev_put(rt_idev);
177 }
178
179 if (rt_dev == dev) {
180 rt->dst.dev = blackhole_netdev;
181 dev_hold(rt->dst.dev);
182 dev_put(rt_dev);
183 }
184 }
185 spin_unlock_bh(&ul->lock);
186 }
187 }
188
189 static inline const void *choose_neigh_daddr(const struct in6_addr *p,
190 struct sk_buff *skb,
191 const void *daddr)
192 {
193 if (!ipv6_addr_any(p))
194 return (const void *) p;
195 else if (skb)
196 return &ipv6_hdr(skb)->daddr;
197 return daddr;
198 }
199
200 struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
201 struct net_device *dev,
202 struct sk_buff *skb,
203 const void *daddr)
204 {
205 struct neighbour *n;
206
207 daddr = choose_neigh_daddr(gw, skb, daddr);
208 n = __ipv6_neigh_lookup(dev, daddr);
209 if (n)
210 return n;
211
212 n = neigh_create(&nd_tbl, daddr, dev);
213 return IS_ERR(n) ? NULL : n;
214 }
215
216 static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
217 struct sk_buff *skb,
218 const void *daddr)
219 {
220 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
221
222 return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),
223 dst->dev, skb, daddr);
224 }
225
226 static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
227 {
228 struct net_device *dev = dst->dev;
229 struct rt6_info *rt = (struct rt6_info *)dst;
230
231 daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr);
232 if (!daddr)
233 return;
234 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
235 return;
236 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
237 return;
238 __ipv6_confirm_neigh(dev, daddr);
239 }
240
241 static struct dst_ops ip6_dst_ops_template = {
242 .family = AF_INET6,
243 .gc = ip6_dst_gc,
244 .gc_thresh = 1024,
245 .check = ip6_dst_check,
246 .default_advmss = ip6_default_advmss,
247 .mtu = ip6_mtu,
248 .cow_metrics = dst_cow_metrics_generic,
249 .destroy = ip6_dst_destroy,
250 .ifdown = ip6_dst_ifdown,
251 .negative_advice = ip6_negative_advice,
252 .link_failure = ip6_link_failure,
253 .update_pmtu = ip6_rt_update_pmtu,
254 .redirect = rt6_do_redirect,
255 .local_out = __ip6_local_out,
256 .neigh_lookup = ip6_dst_neigh_lookup,
257 .confirm_neigh = ip6_confirm_neigh,
258 };
259
260 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
261 {
262 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
263
264 return mtu ? : dst->dev->mtu;
265 }
266
267 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
268 struct sk_buff *skb, u32 mtu,
269 bool confirm_neigh)
270 {
271 }
272
273 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
274 struct sk_buff *skb)
275 {
276 }
277
278 static struct dst_ops ip6_dst_blackhole_ops = {
279 .family = AF_INET6,
280 .destroy = ip6_dst_destroy,
281 .check = ip6_dst_check,
282 .mtu = ip6_blackhole_mtu,
283 .default_advmss = ip6_default_advmss,
284 .update_pmtu = ip6_rt_blackhole_update_pmtu,
285 .redirect = ip6_rt_blackhole_redirect,
286 .cow_metrics = dst_cow_metrics_generic,
287 .neigh_lookup = ip6_dst_neigh_lookup,
288 };
289
290 static const u32 ip6_template_metrics[RTAX_MAX] = {
291 [RTAX_HOPLIMIT - 1] = 0,
292 };
293
294 static const struct fib6_info fib6_null_entry_template = {
295 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
296 .fib6_protocol = RTPROT_KERNEL,
297 .fib6_metric = ~(u32)0,
298 .fib6_ref = REFCOUNT_INIT(1),
299 .fib6_type = RTN_UNREACHABLE,
300 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
301 };
302
303 static const struct rt6_info ip6_null_entry_template = {
304 .dst = {
305 .__refcnt = ATOMIC_INIT(1),
306 .__use = 1,
307 .obsolete = DST_OBSOLETE_FORCE_CHK,
308 .error = -ENETUNREACH,
309 .input = ip6_pkt_discard,
310 .output = ip6_pkt_discard_out,
311 },
312 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
313 };
314
315 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
316
317 static const struct rt6_info ip6_prohibit_entry_template = {
318 .dst = {
319 .__refcnt = ATOMIC_INIT(1),
320 .__use = 1,
321 .obsolete = DST_OBSOLETE_FORCE_CHK,
322 .error = -EACCES,
323 .input = ip6_pkt_prohibit,
324 .output = ip6_pkt_prohibit_out,
325 },
326 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
327 };
328
329 static const struct rt6_info ip6_blk_hole_entry_template = {
330 .dst = {
331 .__refcnt = ATOMIC_INIT(1),
332 .__use = 1,
333 .obsolete = DST_OBSOLETE_FORCE_CHK,
334 .error = -EINVAL,
335 .input = dst_discard,
336 .output = dst_discard_out,
337 },
338 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
339 };
340
341 #endif
342
343 static void rt6_info_init(struct rt6_info *rt)
344 {
345 struct dst_entry *dst = &rt->dst;
346
347 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
348 INIT_LIST_HEAD(&rt->rt6i_uncached);
349 }
350
351
352 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
353 int flags)
354 {
355 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
356 1, DST_OBSOLETE_FORCE_CHK, flags);
357
358 if (rt) {
359 rt6_info_init(rt);
360 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
361 }
362
363 return rt;
364 }
365 EXPORT_SYMBOL(ip6_dst_alloc);
366
367 static void ip6_dst_destroy(struct dst_entry *dst)
368 {
369 struct rt6_info *rt = (struct rt6_info *)dst;
370 struct fib6_info *from;
371 struct inet6_dev *idev;
372
373 ip_dst_metrics_put(dst);
374 rt6_uncached_list_del(rt);
375
376 idev = rt->rt6i_idev;
377 if (idev) {
378 rt->rt6i_idev = NULL;
379 in6_dev_put(idev);
380 }
381
382 from = xchg((__force struct fib6_info **)&rt->from, NULL);
383 fib6_info_release(from);
384 }
385
386 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
387 int how)
388 {
389 struct rt6_info *rt = (struct rt6_info *)dst;
390 struct inet6_dev *idev = rt->rt6i_idev;
391 struct net_device *loopback_dev =
392 dev_net(dev)->loopback_dev;
393
394 if (idev && idev->dev != loopback_dev) {
395 struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
396 if (loopback_idev) {
397 rt->rt6i_idev = loopback_idev;
398 in6_dev_put(idev);
399 }
400 }
401 }
402
403 static bool __rt6_check_expired(const struct rt6_info *rt)
404 {
405 if (rt->rt6i_flags & RTF_EXPIRES)
406 return time_after(jiffies, rt->dst.expires);
407 else
408 return false;
409 }
410
411 static bool rt6_check_expired(const struct rt6_info *rt)
412 {
413 struct fib6_info *from;
414
415 from = rcu_dereference(rt->from);
416
417 if (rt->rt6i_flags & RTF_EXPIRES) {
418 if (time_after(jiffies, rt->dst.expires))
419 return true;
420 } else if (from) {
421 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
422 fib6_check_expired(from);
423 }
424 return false;
425 }
426
427 void fib6_select_path(const struct net *net, struct fib6_result *res,
428 struct flowi6 *fl6, int oif, bool have_oif_match,
429 const struct sk_buff *skb, int strict)
430 {
431 struct fib6_info *sibling, *next_sibling;
432 struct fib6_info *match = res->f6i;
433
434 if ((!match->fib6_nsiblings && !match->nh) || have_oif_match)
435 goto out;
436
437
438
439
440 if (!fl6->mp_hash &&
441 (!match->nh || nexthop_is_multipath(match->nh)))
442 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
443
444 if (unlikely(match->nh)) {
445 nexthop_path_fib6_result(res, fl6->mp_hash);
446 return;
447 }
448
449 if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound))
450 goto out;
451
452 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
453 fib6_siblings) {
454 const struct fib6_nh *nh = sibling->fib6_nh;
455 int nh_upper_bound;
456
457 nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
458 if (fl6->mp_hash > nh_upper_bound)
459 continue;
460 if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
461 break;
462 match = sibling;
463 break;
464 }
465
466 out:
467 res->f6i = match;
468 res->nh = match->fib6_nh;
469 }
470
471
472
473
474
475 static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
476 const struct in6_addr *saddr, int oif, int flags)
477 {
478 const struct net_device *dev;
479
480 if (nh->fib_nh_flags & RTNH_F_DEAD)
481 return false;
482
483 dev = nh->fib_nh_dev;
484 if (oif) {
485 if (dev->ifindex == oif)
486 return true;
487 } else {
488 if (ipv6_chk_addr(net, saddr, dev,
489 flags & RT6_LOOKUP_F_IFACE))
490 return true;
491 }
492
493 return false;
494 }
495
496 struct fib6_nh_dm_arg {
497 struct net *net;
498 const struct in6_addr *saddr;
499 int oif;
500 int flags;
501 struct fib6_nh *nh;
502 };
503
504 static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg)
505 {
506 struct fib6_nh_dm_arg *arg = _arg;
507
508 arg->nh = nh;
509 return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif,
510 arg->flags);
511 }
512
513
514 static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh,
515 struct fib6_result *res,
516 const struct in6_addr *saddr,
517 int oif, int flags)
518 {
519 struct fib6_nh_dm_arg arg = {
520 .net = net,
521 .saddr = saddr,
522 .oif = oif,
523 .flags = flags,
524 };
525
526 if (nexthop_is_blackhole(nh))
527 return NULL;
528
529 if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg))
530 return arg.nh;
531
532 return NULL;
533 }
534
535 static void rt6_device_match(struct net *net, struct fib6_result *res,
536 const struct in6_addr *saddr, int oif, int flags)
537 {
538 struct fib6_info *f6i = res->f6i;
539 struct fib6_info *spf6i;
540 struct fib6_nh *nh;
541
542 if (!oif && ipv6_addr_any(saddr)) {
543 if (unlikely(f6i->nh)) {
544 nh = nexthop_fib6_nh(f6i->nh);
545 if (nexthop_is_blackhole(f6i->nh))
546 goto out_blackhole;
547 } else {
548 nh = f6i->fib6_nh;
549 }
550 if (!(nh->fib_nh_flags & RTNH_F_DEAD))
551 goto out;
552 }
553
554 for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
555 bool matched = false;
556
557 if (unlikely(spf6i->nh)) {
558 nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr,
559 oif, flags);
560 if (nh)
561 matched = true;
562 } else {
563 nh = spf6i->fib6_nh;
564 if (__rt6_device_match(net, nh, saddr, oif, flags))
565 matched = true;
566 }
567 if (matched) {
568 res->f6i = spf6i;
569 goto out;
570 }
571 }
572
573 if (oif && flags & RT6_LOOKUP_F_IFACE) {
574 res->f6i = net->ipv6.fib6_null_entry;
575 nh = res->f6i->fib6_nh;
576 goto out;
577 }
578
579 if (unlikely(f6i->nh)) {
580 nh = nexthop_fib6_nh(f6i->nh);
581 if (nexthop_is_blackhole(f6i->nh))
582 goto out_blackhole;
583 } else {
584 nh = f6i->fib6_nh;
585 }
586
587 if (nh->fib_nh_flags & RTNH_F_DEAD) {
588 res->f6i = net->ipv6.fib6_null_entry;
589 nh = res->f6i->fib6_nh;
590 }
591 out:
592 res->nh = nh;
593 res->fib6_type = res->f6i->fib6_type;
594 res->fib6_flags = res->f6i->fib6_flags;
595 return;
596
597 out_blackhole:
598 res->fib6_flags |= RTF_REJECT;
599 res->fib6_type = RTN_BLACKHOLE;
600 res->nh = nh;
601 }
602
603 #ifdef CONFIG_IPV6_ROUTER_PREF
604 struct __rt6_probe_work {
605 struct work_struct work;
606 struct in6_addr target;
607 struct net_device *dev;
608 };
609
610 static void rt6_probe_deferred(struct work_struct *w)
611 {
612 struct in6_addr mcaddr;
613 struct __rt6_probe_work *work =
614 container_of(w, struct __rt6_probe_work, work);
615
616 addrconf_addr_solict_mult(&work->target, &mcaddr);
617 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
618 dev_put(work->dev);
619 kfree(work);
620 }
621
622 static void rt6_probe(struct fib6_nh *fib6_nh)
623 {
624 struct __rt6_probe_work *work = NULL;
625 const struct in6_addr *nh_gw;
626 unsigned long last_probe;
627 struct neighbour *neigh;
628 struct net_device *dev;
629 struct inet6_dev *idev;
630
631
632
633
634
635
636
637
638
639 if (!fib6_nh->fib_nh_gw_family)
640 return;
641
642 nh_gw = &fib6_nh->fib_nh_gw6;
643 dev = fib6_nh->fib_nh_dev;
644 rcu_read_lock_bh();
645 last_probe = READ_ONCE(fib6_nh->last_probe);
646 idev = __in6_dev_get(dev);
647 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
648 if (neigh) {
649 if (neigh->nud_state & NUD_VALID)
650 goto out;
651
652 write_lock(&neigh->lock);
653 if (!(neigh->nud_state & NUD_VALID) &&
654 time_after(jiffies,
655 neigh->updated + idev->cnf.rtr_probe_interval)) {
656 work = kmalloc(sizeof(*work), GFP_ATOMIC);
657 if (work)
658 __neigh_set_probe_once(neigh);
659 }
660 write_unlock(&neigh->lock);
661 } else if (time_after(jiffies, last_probe +
662 idev->cnf.rtr_probe_interval)) {
663 work = kmalloc(sizeof(*work), GFP_ATOMIC);
664 }
665
666 if (!work || cmpxchg(&fib6_nh->last_probe,
667 last_probe, jiffies) != last_probe) {
668 kfree(work);
669 } else {
670 INIT_WORK(&work->work, rt6_probe_deferred);
671 work->target = *nh_gw;
672 dev_hold(dev);
673 work->dev = dev;
674 schedule_work(&work->work);
675 }
676
677 out:
678 rcu_read_unlock_bh();
679 }
680 #else
681 static inline void rt6_probe(struct fib6_nh *fib6_nh)
682 {
683 }
684 #endif
685
686
687
688
689 static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
690 {
691 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
692 struct neighbour *neigh;
693
694 rcu_read_lock_bh();
695 neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
696 &fib6_nh->fib_nh_gw6);
697 if (neigh) {
698 read_lock(&neigh->lock);
699 if (neigh->nud_state & NUD_VALID)
700 ret = RT6_NUD_SUCCEED;
701 #ifdef CONFIG_IPV6_ROUTER_PREF
702 else if (!(neigh->nud_state & NUD_FAILED))
703 ret = RT6_NUD_SUCCEED;
704 else
705 ret = RT6_NUD_FAIL_PROBE;
706 #endif
707 read_unlock(&neigh->lock);
708 } else {
709 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
710 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
711 }
712 rcu_read_unlock_bh();
713
714 return ret;
715 }
716
717 static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
718 int strict)
719 {
720 int m = 0;
721
722 if (!oif || nh->fib_nh_dev->ifindex == oif)
723 m = 2;
724
725 if (!m && (strict & RT6_LOOKUP_F_IFACE))
726 return RT6_NUD_FAIL_HARD;
727 #ifdef CONFIG_IPV6_ROUTER_PREF
728 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
729 #endif
730 if ((strict & RT6_LOOKUP_F_REACHABLE) &&
731 !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
732 int n = rt6_check_neigh(nh);
733 if (n < 0)
734 return n;
735 }
736 return m;
737 }
738
739 static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
740 int oif, int strict, int *mpri, bool *do_rr)
741 {
742 bool match_do_rr = false;
743 bool rc = false;
744 int m;
745
746 if (nh->fib_nh_flags & RTNH_F_DEAD)
747 goto out;
748
749 if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
750 nh->fib_nh_flags & RTNH_F_LINKDOWN &&
751 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
752 goto out;
753
754 m = rt6_score_route(nh, fib6_flags, oif, strict);
755 if (m == RT6_NUD_FAIL_DO_RR) {
756 match_do_rr = true;
757 m = 0;
758 } else if (m == RT6_NUD_FAIL_HARD) {
759 goto out;
760 }
761
762 if (strict & RT6_LOOKUP_F_REACHABLE)
763 rt6_probe(nh);
764
765
766 if (m > *mpri) {
767 *do_rr = match_do_rr;
768 *mpri = m;
769 rc = true;
770 }
771 out:
772 return rc;
773 }
774
775 struct fib6_nh_frl_arg {
776 u32 flags;
777 int oif;
778 int strict;
779 int *mpri;
780 bool *do_rr;
781 struct fib6_nh *nh;
782 };
783
784 static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg)
785 {
786 struct fib6_nh_frl_arg *arg = _arg;
787
788 arg->nh = nh;
789 return find_match(nh, arg->flags, arg->oif, arg->strict,
790 arg->mpri, arg->do_rr);
791 }
792
793 static void __find_rr_leaf(struct fib6_info *f6i_start,
794 struct fib6_info *nomatch, u32 metric,
795 struct fib6_result *res, struct fib6_info **cont,
796 int oif, int strict, bool *do_rr, int *mpri)
797 {
798 struct fib6_info *f6i;
799
800 for (f6i = f6i_start;
801 f6i && f6i != nomatch;
802 f6i = rcu_dereference(f6i->fib6_next)) {
803 bool matched = false;
804 struct fib6_nh *nh;
805
806 if (cont && f6i->fib6_metric != metric) {
807 *cont = f6i;
808 return;
809 }
810
811 if (fib6_check_expired(f6i))
812 continue;
813
814 if (unlikely(f6i->nh)) {
815 struct fib6_nh_frl_arg arg = {
816 .flags = f6i->fib6_flags,
817 .oif = oif,
818 .strict = strict,
819 .mpri = mpri,
820 .do_rr = do_rr
821 };
822
823 if (nexthop_is_blackhole(f6i->nh)) {
824 res->fib6_flags = RTF_REJECT;
825 res->fib6_type = RTN_BLACKHOLE;
826 res->f6i = f6i;
827 res->nh = nexthop_fib6_nh(f6i->nh);
828 return;
829 }
830 if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match,
831 &arg)) {
832 matched = true;
833 nh = arg.nh;
834 }
835 } else {
836 nh = f6i->fib6_nh;
837 if (find_match(nh, f6i->fib6_flags, oif, strict,
838 mpri, do_rr))
839 matched = true;
840 }
841 if (matched) {
842 res->f6i = f6i;
843 res->nh = nh;
844 res->fib6_flags = f6i->fib6_flags;
845 res->fib6_type = f6i->fib6_type;
846 }
847 }
848 }
849
850 static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
851 struct fib6_info *rr_head, int oif, int strict,
852 bool *do_rr, struct fib6_result *res)
853 {
854 u32 metric = rr_head->fib6_metric;
855 struct fib6_info *cont = NULL;
856 int mpri = -1;
857
858 __find_rr_leaf(rr_head, NULL, metric, res, &cont,
859 oif, strict, do_rr, &mpri);
860
861 __find_rr_leaf(leaf, rr_head, metric, res, &cont,
862 oif, strict, do_rr, &mpri);
863
864 if (res->f6i || !cont)
865 return;
866
867 __find_rr_leaf(cont, NULL, metric, res, NULL,
868 oif, strict, do_rr, &mpri);
869 }
870
871 static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
872 struct fib6_result *res, int strict)
873 {
874 struct fib6_info *leaf = rcu_dereference(fn->leaf);
875 struct fib6_info *rt0;
876 bool do_rr = false;
877 int key_plen;
878
879
880 res->f6i = NULL;
881
882 if (!leaf || leaf == net->ipv6.fib6_null_entry)
883 goto out;
884
885 rt0 = rcu_dereference(fn->rr_ptr);
886 if (!rt0)
887 rt0 = leaf;
888
889
890
891
892
893
894 key_plen = rt0->fib6_dst.plen;
895 #ifdef CONFIG_IPV6_SUBTREES
896 if (rt0->fib6_src.plen)
897 key_plen = rt0->fib6_src.plen;
898 #endif
899 if (fn->fn_bit != key_plen)
900 goto out;
901
902 find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
903 if (do_rr) {
904 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
905
906
907 if (!next || next->fib6_metric != rt0->fib6_metric)
908 next = leaf;
909
910 if (next != rt0) {
911 spin_lock_bh(&leaf->fib6_table->tb6_lock);
912
913 if (next->fib6_node)
914 rcu_assign_pointer(fn->rr_ptr, next);
915 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
916 }
917 }
918
919 out:
920 if (!res->f6i) {
921 res->f6i = net->ipv6.fib6_null_entry;
922 res->nh = res->f6i->fib6_nh;
923 res->fib6_flags = res->f6i->fib6_flags;
924 res->fib6_type = res->f6i->fib6_type;
925 }
926 }
927
928 static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
929 {
930 return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
931 res->nh->fib_nh_gw_family;
932 }
933
934 #ifdef CONFIG_IPV6_ROUTE_INFO
935 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
936 const struct in6_addr *gwaddr)
937 {
938 struct net *net = dev_net(dev);
939 struct route_info *rinfo = (struct route_info *) opt;
940 struct in6_addr prefix_buf, *prefix;
941 unsigned int pref;
942 unsigned long lifetime;
943 struct fib6_info *rt;
944
945 if (len < sizeof(struct route_info)) {
946 return -EINVAL;
947 }
948
949
950 if (rinfo->length > 3) {
951 return -EINVAL;
952 } else if (rinfo->prefix_len > 128) {
953 return -EINVAL;
954 } else if (rinfo->prefix_len > 64) {
955 if (rinfo->length < 2) {
956 return -EINVAL;
957 }
958 } else if (rinfo->prefix_len > 0) {
959 if (rinfo->length < 1) {
960 return -EINVAL;
961 }
962 }
963
964 pref = rinfo->route_pref;
965 if (pref == ICMPV6_ROUTER_PREF_INVALID)
966 return -EINVAL;
967
968 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
969
970 if (rinfo->length == 3)
971 prefix = (struct in6_addr *)rinfo->prefix;
972 else {
973
974 ipv6_addr_prefix(&prefix_buf,
975 (struct in6_addr *)rinfo->prefix,
976 rinfo->prefix_len);
977 prefix = &prefix_buf;
978 }
979
980 if (rinfo->prefix_len == 0)
981 rt = rt6_get_dflt_router(net, gwaddr, dev);
982 else
983 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
984 gwaddr, dev);
985
986 if (rt && !lifetime) {
987 ip6_del_rt(net, rt);
988 rt = NULL;
989 }
990
991 if (!rt && lifetime)
992 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
993 dev, pref);
994 else if (rt)
995 rt->fib6_flags = RTF_ROUTEINFO |
996 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
997
998 if (rt) {
999 if (!addrconf_finite_timeout(lifetime))
1000 fib6_clean_expires(rt);
1001 else
1002 fib6_set_expires(rt, jiffies + HZ * lifetime);
1003
1004 fib6_info_release(rt);
1005 }
1006 return 0;
1007 }
1008 #endif
1009
1010
1011
1012
1013
1014
1015 static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
1016 {
1017 struct net_device *dev = res->nh->fib_nh_dev;
1018
1019 if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
1020
1021
1022
1023
1024 if (netif_is_l3_slave(dev) &&
1025 !rt6_need_strict(&res->f6i->fib6_dst.addr))
1026 dev = l3mdev_master_dev_rcu(dev);
1027 else if (!netif_is_l3_master(dev))
1028 dev = dev_net(dev)->loopback_dev;
1029
1030
1031
1032 }
1033
1034 return dev;
1035 }
1036
1037 static const int fib6_prop[RTN_MAX + 1] = {
1038 [RTN_UNSPEC] = 0,
1039 [RTN_UNICAST] = 0,
1040 [RTN_LOCAL] = 0,
1041 [RTN_BROADCAST] = 0,
1042 [RTN_ANYCAST] = 0,
1043 [RTN_MULTICAST] = 0,
1044 [RTN_BLACKHOLE] = -EINVAL,
1045 [RTN_UNREACHABLE] = -EHOSTUNREACH,
1046 [RTN_PROHIBIT] = -EACCES,
1047 [RTN_THROW] = -EAGAIN,
1048 [RTN_NAT] = -EINVAL,
1049 [RTN_XRESOLVE] = -EINVAL,
1050 };
1051
1052 static int ip6_rt_type_to_error(u8 fib6_type)
1053 {
1054 return fib6_prop[fib6_type];
1055 }
1056
1057 static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
1058 {
1059 unsigned short flags = 0;
1060
1061 if (rt->dst_nocount)
1062 flags |= DST_NOCOUNT;
1063 if (rt->dst_nopolicy)
1064 flags |= DST_NOPOLICY;
1065 if (rt->dst_host)
1066 flags |= DST_HOST;
1067
1068 return flags;
1069 }
1070
1071 static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
1072 {
1073 rt->dst.error = ip6_rt_type_to_error(fib6_type);
1074
1075 switch (fib6_type) {
1076 case RTN_BLACKHOLE:
1077 rt->dst.output = dst_discard_out;
1078 rt->dst.input = dst_discard;
1079 break;
1080 case RTN_PROHIBIT:
1081 rt->dst.output = ip6_pkt_prohibit_out;
1082 rt->dst.input = ip6_pkt_prohibit;
1083 break;
1084 case RTN_THROW:
1085 case RTN_UNREACHABLE:
1086 default:
1087 rt->dst.output = ip6_pkt_discard_out;
1088 rt->dst.input = ip6_pkt_discard;
1089 break;
1090 }
1091 }
1092
1093 static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
1094 {
1095 struct fib6_info *f6i = res->f6i;
1096
1097 if (res->fib6_flags & RTF_REJECT) {
1098 ip6_rt_init_dst_reject(rt, res->fib6_type);
1099 return;
1100 }
1101
1102 rt->dst.error = 0;
1103 rt->dst.output = ip6_output;
1104
1105 if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
1106 rt->dst.input = ip6_input;
1107 } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
1108 rt->dst.input = ip6_mc_input;
1109 } else {
1110 rt->dst.input = ip6_forward;
1111 }
1112
1113 if (res->nh->fib_nh_lws) {
1114 rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
1115 lwtunnel_set_redirect(&rt->dst);
1116 }
1117
1118 rt->dst.lastuse = jiffies;
1119 }
1120
1121
1122 static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
1123 {
1124 rt->rt6i_flags &= ~RTF_EXPIRES;
1125 rcu_assign_pointer(rt->from, from);
1126 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
1127 }
1128
1129
1130 static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
1131 {
1132 const struct fib6_nh *nh = res->nh;
1133 const struct net_device *dev = nh->fib_nh_dev;
1134 struct fib6_info *f6i = res->f6i;
1135
1136 ip6_rt_init_dst(rt, res);
1137
1138 rt->rt6i_dst = f6i->fib6_dst;
1139 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
1140 rt->rt6i_flags = res->fib6_flags;
1141 if (nh->fib_nh_gw_family) {
1142 rt->rt6i_gateway = nh->fib_nh_gw6;
1143 rt->rt6i_flags |= RTF_GATEWAY;
1144 }
1145 rt6_set_from(rt, f6i);
1146 #ifdef CONFIG_IPV6_SUBTREES
1147 rt->rt6i_src = f6i->fib6_src;
1148 #endif
1149 }
1150
1151 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
1152 struct in6_addr *saddr)
1153 {
1154 struct fib6_node *pn, *sn;
1155 while (1) {
1156 if (fn->fn_flags & RTN_TL_ROOT)
1157 return NULL;
1158 pn = rcu_dereference(fn->parent);
1159 sn = FIB6_SUBTREE(pn);
1160 if (sn && sn != fn)
1161 fn = fib6_node_lookup(sn, NULL, saddr);
1162 else
1163 fn = pn;
1164 if (fn->fn_flags & RTN_RTINFO)
1165 return fn;
1166 }
1167 }
1168
1169 static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
1170 {
1171 struct rt6_info *rt = *prt;
1172
1173 if (dst_hold_safe(&rt->dst))
1174 return true;
1175 if (net) {
1176 rt = net->ipv6.ip6_null_entry;
1177 dst_hold(&rt->dst);
1178 } else {
1179 rt = NULL;
1180 }
1181 *prt = rt;
1182 return false;
1183 }
1184
1185
1186 static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
1187 {
1188 struct net_device *dev = res->nh->fib_nh_dev;
1189 struct fib6_info *f6i = res->f6i;
1190 unsigned short flags;
1191 struct rt6_info *nrt;
1192
1193 if (!fib6_info_hold_safe(f6i))
1194 goto fallback;
1195
1196 flags = fib6_info_dst_flags(f6i);
1197 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
1198 if (!nrt) {
1199 fib6_info_release(f6i);
1200 goto fallback;
1201 }
1202
1203 ip6_rt_copy_init(nrt, res);
1204 return nrt;
1205
1206 fallback:
1207 nrt = dev_net(dev)->ipv6.ip6_null_entry;
1208 dst_hold(&nrt->dst);
1209 return nrt;
1210 }
1211
1212 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
1213 struct fib6_table *table,
1214 struct flowi6 *fl6,
1215 const struct sk_buff *skb,
1216 int flags)
1217 {
1218 struct fib6_result res = {};
1219 struct fib6_node *fn;
1220 struct rt6_info *rt;
1221
1222 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1223 flags &= ~RT6_LOOKUP_F_IFACE;
1224
1225 rcu_read_lock();
1226 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1227 restart:
1228 res.f6i = rcu_dereference(fn->leaf);
1229 if (!res.f6i)
1230 res.f6i = net->ipv6.fib6_null_entry;
1231 else
1232 rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
1233 flags);
1234
1235 if (res.f6i == net->ipv6.fib6_null_entry) {
1236 fn = fib6_backtrack(fn, &fl6->saddr);
1237 if (fn)
1238 goto restart;
1239
1240 rt = net->ipv6.ip6_null_entry;
1241 dst_hold(&rt->dst);
1242 goto out;
1243 } else if (res.fib6_flags & RTF_REJECT) {
1244 goto do_create;
1245 }
1246
1247 fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
1248 fl6->flowi6_oif != 0, skb, flags);
1249
1250
1251 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
1252 if (rt) {
1253 if (ip6_hold_safe(net, &rt))
1254 dst_use_noref(&rt->dst, jiffies);
1255 } else {
1256 do_create:
1257 rt = ip6_create_rt_rcu(&res);
1258 }
1259
1260 out:
1261 trace_fib6_table_lookup(net, &res, table, fl6);
1262
1263 rcu_read_unlock();
1264
1265 return rt;
1266 }
1267
1268 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
1269 const struct sk_buff *skb, int flags)
1270 {
1271 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
1272 }
1273 EXPORT_SYMBOL_GPL(ip6_route_lookup);
1274
1275 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
1276 const struct in6_addr *saddr, int oif,
1277 const struct sk_buff *skb, int strict)
1278 {
1279 struct flowi6 fl6 = {
1280 .flowi6_oif = oif,
1281 .daddr = *daddr,
1282 };
1283 struct dst_entry *dst;
1284 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
1285
1286 if (saddr) {
1287 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
1288 flags |= RT6_LOOKUP_F_HAS_SADDR;
1289 }
1290
1291 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
1292 if (dst->error == 0)
1293 return (struct rt6_info *) dst;
1294
1295 dst_release(dst);
1296
1297 return NULL;
1298 }
1299 EXPORT_SYMBOL(rt6_lookup);
1300
1301
1302
1303
1304
1305
1306
1307 static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
1308 struct netlink_ext_ack *extack)
1309 {
1310 int err;
1311 struct fib6_table *table;
1312
1313 table = rt->fib6_table;
1314 spin_lock_bh(&table->tb6_lock);
1315 err = fib6_add(&table->tb6_root, rt, info, extack);
1316 spin_unlock_bh(&table->tb6_lock);
1317
1318 return err;
1319 }
1320
1321 int ip6_ins_rt(struct net *net, struct fib6_info *rt)
1322 {
1323 struct nl_info info = { .nl_net = net, };
1324
1325 return __ip6_ins_rt(rt, &info, NULL);
1326 }
1327
1328 static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
1329 const struct in6_addr *daddr,
1330 const struct in6_addr *saddr)
1331 {
1332 struct fib6_info *f6i = res->f6i;
1333 struct net_device *dev;
1334 struct rt6_info *rt;
1335
1336
1337
1338
1339
1340 if (!fib6_info_hold_safe(f6i))
1341 return NULL;
1342
1343 dev = ip6_rt_get_dev_rcu(res);
1344 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
1345 if (!rt) {
1346 fib6_info_release(f6i);
1347 return NULL;
1348 }
1349
1350 ip6_rt_copy_init(rt, res);
1351 rt->rt6i_flags |= RTF_CACHE;
1352 rt->dst.flags |= DST_HOST;
1353 rt->rt6i_dst.addr = *daddr;
1354 rt->rt6i_dst.plen = 128;
1355
1356 if (!rt6_is_gw_or_nonexthop(res)) {
1357 if (f6i->fib6_dst.plen != 128 &&
1358 ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
1359 rt->rt6i_flags |= RTF_ANYCAST;
1360 #ifdef CONFIG_IPV6_SUBTREES
1361 if (rt->rt6i_src.plen && saddr) {
1362 rt->rt6i_src.addr = *saddr;
1363 rt->rt6i_src.plen = 128;
1364 }
1365 #endif
1366 }
1367
1368 return rt;
1369 }
1370
1371 static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
1372 {
1373 struct fib6_info *f6i = res->f6i;
1374 unsigned short flags = fib6_info_dst_flags(f6i);
1375 struct net_device *dev;
1376 struct rt6_info *pcpu_rt;
1377
1378 if (!fib6_info_hold_safe(f6i))
1379 return NULL;
1380
1381 rcu_read_lock();
1382 dev = ip6_rt_get_dev_rcu(res);
1383 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags);
1384 rcu_read_unlock();
1385 if (!pcpu_rt) {
1386 fib6_info_release(f6i);
1387 return NULL;
1388 }
1389 ip6_rt_copy_init(pcpu_rt, res);
1390 pcpu_rt->rt6i_flags |= RTF_PCPU;
1391
1392 if (f6i->nh)
1393 pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev));
1394
1395 return pcpu_rt;
1396 }
1397
1398 static bool rt6_is_valid(const struct rt6_info *rt6)
1399 {
1400 return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev));
1401 }
1402
1403
1404 static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
1405 {
1406 struct rt6_info *pcpu_rt;
1407
1408 pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu);
1409
1410 if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) {
1411 struct rt6_info *prev, **p;
1412
1413 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1414 prev = xchg(p, NULL);
1415 if (prev) {
1416 dst_dev_put(&prev->dst);
1417 dst_release(&prev->dst);
1418 }
1419
1420 pcpu_rt = NULL;
1421 }
1422
1423 return pcpu_rt;
1424 }
1425
1426 static struct rt6_info *rt6_make_pcpu_route(struct net *net,
1427 const struct fib6_result *res)
1428 {
1429 struct rt6_info *pcpu_rt, *prev, **p;
1430
1431 pcpu_rt = ip6_rt_pcpu_alloc(res);
1432 if (!pcpu_rt)
1433 return NULL;
1434
1435 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1436 prev = cmpxchg(p, NULL, pcpu_rt);
1437 BUG_ON(prev);
1438
1439 if (res->f6i->fib6_destroying) {
1440 struct fib6_info *from;
1441
1442 from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL);
1443 fib6_info_release(from);
1444 }
1445
1446 return pcpu_rt;
1447 }
1448
1449
1450
1451 static DEFINE_SPINLOCK(rt6_exception_lock);
1452
1453
1454
1455
1456 static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1457 struct rt6_exception *rt6_ex)
1458 {
1459 struct fib6_info *from;
1460 struct net *net;
1461
1462 if (!bucket || !rt6_ex)
1463 return;
1464
1465 net = dev_net(rt6_ex->rt6i->dst.dev);
1466 net->ipv6.rt6_stats->fib_rt_cache--;
1467
1468
1469
1470
1471 from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
1472 fib6_info_release(from);
1473 dst_dev_put(&rt6_ex->rt6i->dst);
1474
1475 hlist_del_rcu(&rt6_ex->hlist);
1476 dst_release(&rt6_ex->rt6i->dst);
1477 kfree_rcu(rt6_ex, rcu);
1478 WARN_ON_ONCE(!bucket->depth);
1479 bucket->depth--;
1480 }
1481
1482
1483
1484
1485 static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1486 {
1487 struct rt6_exception *rt6_ex, *oldest = NULL;
1488
1489 if (!bucket)
1490 return;
1491
1492 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1493 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1494 oldest = rt6_ex;
1495 }
1496 rt6_remove_exception(bucket, oldest);
1497 }
1498
1499 static u32 rt6_exception_hash(const struct in6_addr *dst,
1500 const struct in6_addr *src)
1501 {
1502 static u32 seed __read_mostly;
1503 u32 val;
1504
1505 net_get_random_once(&seed, sizeof(seed));
1506 val = jhash(dst, sizeof(*dst), seed);
1507
1508 #ifdef CONFIG_IPV6_SUBTREES
1509 if (src)
1510 val = jhash(src, sizeof(*src), val);
1511 #endif
1512 return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1513 }
1514
1515
1516
1517
1518
1519
1520 static struct rt6_exception *
1521 __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1522 const struct in6_addr *daddr,
1523 const struct in6_addr *saddr)
1524 {
1525 struct rt6_exception *rt6_ex;
1526 u32 hval;
1527
1528 if (!(*bucket) || !daddr)
1529 return NULL;
1530
1531 hval = rt6_exception_hash(daddr, saddr);
1532 *bucket += hval;
1533
1534 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1535 struct rt6_info *rt6 = rt6_ex->rt6i;
1536 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1537
1538 #ifdef CONFIG_IPV6_SUBTREES
1539 if (matched && saddr)
1540 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1541 #endif
1542 if (matched)
1543 return rt6_ex;
1544 }
1545 return NULL;
1546 }
1547
1548
1549
1550
1551
1552
1553 static struct rt6_exception *
1554 __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1555 const struct in6_addr *daddr,
1556 const struct in6_addr *saddr)
1557 {
1558 struct rt6_exception *rt6_ex;
1559 u32 hval;
1560
1561 WARN_ON_ONCE(!rcu_read_lock_held());
1562
1563 if (!(*bucket) || !daddr)
1564 return NULL;
1565
1566 hval = rt6_exception_hash(daddr, saddr);
1567 *bucket += hval;
1568
1569 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1570 struct rt6_info *rt6 = rt6_ex->rt6i;
1571 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1572
1573 #ifdef CONFIG_IPV6_SUBTREES
1574 if (matched && saddr)
1575 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1576 #endif
1577 if (matched)
1578 return rt6_ex;
1579 }
1580 return NULL;
1581 }
1582
1583 static unsigned int fib6_mtu(const struct fib6_result *res)
1584 {
1585 const struct fib6_nh *nh = res->nh;
1586 unsigned int mtu;
1587
1588 if (res->f6i->fib6_pmtu) {
1589 mtu = res->f6i->fib6_pmtu;
1590 } else {
1591 struct net_device *dev = nh->fib_nh_dev;
1592 struct inet6_dev *idev;
1593
1594 rcu_read_lock();
1595 idev = __in6_dev_get(dev);
1596 mtu = idev->cnf.mtu6;
1597 rcu_read_unlock();
1598 }
1599
1600 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1601
1602 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
1603 }
1604
1605 #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL
1606
1607
1608
1609
1610
1611
1612 static
1613 struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh,
1614 spinlock_t *lock)
1615 {
1616 struct rt6_exception_bucket *bucket;
1617
1618 if (lock)
1619 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1620 lockdep_is_held(lock));
1621 else
1622 bucket = rcu_dereference(nh->rt6i_exception_bucket);
1623
1624
1625 if (bucket) {
1626 unsigned long p = (unsigned long)bucket;
1627
1628 p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED;
1629 bucket = (struct rt6_exception_bucket *)p;
1630 }
1631
1632 return bucket;
1633 }
1634
1635 static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket)
1636 {
1637 unsigned long p = (unsigned long)bucket;
1638
1639 return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED);
1640 }
1641
1642
1643 static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh,
1644 spinlock_t *lock)
1645 {
1646 struct rt6_exception_bucket *bucket;
1647 unsigned long p;
1648
1649 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1650 lockdep_is_held(lock));
1651
1652 p = (unsigned long)bucket;
1653 p |= FIB6_EXCEPTION_BUCKET_FLUSHED;
1654 bucket = (struct rt6_exception_bucket *)p;
1655 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1656 }
1657
1658 static int rt6_insert_exception(struct rt6_info *nrt,
1659 const struct fib6_result *res)
1660 {
1661 struct net *net = dev_net(nrt->dst.dev);
1662 struct rt6_exception_bucket *bucket;
1663 struct fib6_info *f6i = res->f6i;
1664 struct in6_addr *src_key = NULL;
1665 struct rt6_exception *rt6_ex;
1666 struct fib6_nh *nh = res->nh;
1667 int err = 0;
1668
1669 spin_lock_bh(&rt6_exception_lock);
1670
1671 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1672 lockdep_is_held(&rt6_exception_lock));
1673 if (!bucket) {
1674 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1675 GFP_ATOMIC);
1676 if (!bucket) {
1677 err = -ENOMEM;
1678 goto out;
1679 }
1680 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1681 } else if (fib6_nh_excptn_bucket_flushed(bucket)) {
1682 err = -EINVAL;
1683 goto out;
1684 }
1685
1686 #ifdef CONFIG_IPV6_SUBTREES
1687
1688
1689
1690
1691
1692
1693 if (f6i->fib6_src.plen)
1694 src_key = &nrt->rt6i_src.addr;
1695 #endif
1696
1697
1698
1699
1700 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
1701 err = -EINVAL;
1702 goto out;
1703 }
1704
1705 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1706 src_key);
1707 if (rt6_ex)
1708 rt6_remove_exception(bucket, rt6_ex);
1709
1710 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1711 if (!rt6_ex) {
1712 err = -ENOMEM;
1713 goto out;
1714 }
1715 rt6_ex->rt6i = nrt;
1716 rt6_ex->stamp = jiffies;
1717 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1718 bucket->depth++;
1719 net->ipv6.rt6_stats->fib_rt_cache++;
1720
1721 if (bucket->depth > FIB6_MAX_DEPTH)
1722 rt6_exception_remove_oldest(bucket);
1723
1724 out:
1725 spin_unlock_bh(&rt6_exception_lock);
1726
1727
1728 if (!err) {
1729 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1730 fib6_update_sernum(net, f6i);
1731 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
1732 fib6_force_start_gc(net);
1733 }
1734
1735 return err;
1736 }
1737
1738 static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from)
1739 {
1740 struct rt6_exception_bucket *bucket;
1741 struct rt6_exception *rt6_ex;
1742 struct hlist_node *tmp;
1743 int i;
1744
1745 spin_lock_bh(&rt6_exception_lock);
1746
1747 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1748 if (!bucket)
1749 goto out;
1750
1751
1752 if (!from)
1753 fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock);
1754
1755 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1756 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) {
1757 if (!from ||
1758 rcu_access_pointer(rt6_ex->rt6i->from) == from)
1759 rt6_remove_exception(bucket, rt6_ex);
1760 }
1761 WARN_ON_ONCE(!from && bucket->depth);
1762 bucket++;
1763 }
1764 out:
1765 spin_unlock_bh(&rt6_exception_lock);
1766 }
1767
1768 static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
1769 {
1770 struct fib6_info *f6i = arg;
1771
1772 fib6_nh_flush_exceptions(nh, f6i);
1773
1774 return 0;
1775 }
1776
1777 void rt6_flush_exceptions(struct fib6_info *f6i)
1778 {
1779 if (f6i->nh)
1780 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
1781 f6i);
1782 else
1783 fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
1784 }
1785
1786
1787
1788
1789 static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
1790 const struct in6_addr *daddr,
1791 const struct in6_addr *saddr)
1792 {
1793 const struct in6_addr *src_key = NULL;
1794 struct rt6_exception_bucket *bucket;
1795 struct rt6_exception *rt6_ex;
1796 struct rt6_info *ret = NULL;
1797
1798 #ifdef CONFIG_IPV6_SUBTREES
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810 if (res->f6i->fib6_src.plen)
1811 src_key = saddr;
1812 find_ex:
1813 #endif
1814 bucket = fib6_nh_get_excptn_bucket(res->nh, NULL);
1815 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1816
1817 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
1818 ret = rt6_ex->rt6i;
1819
1820 #ifdef CONFIG_IPV6_SUBTREES
1821
1822 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1823 src_key = &res->f6i->fib6_src.addr;
1824 goto find_ex;
1825 }
1826 #endif
1827
1828 return ret;
1829 }
1830
1831
1832 static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
1833 const struct rt6_info *rt)
1834 {
1835 const struct in6_addr *src_key = NULL;
1836 struct rt6_exception_bucket *bucket;
1837 struct rt6_exception *rt6_ex;
1838 int err;
1839
1840 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
1841 return -ENOENT;
1842
1843 spin_lock_bh(&rt6_exception_lock);
1844 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1845
1846 #ifdef CONFIG_IPV6_SUBTREES
1847
1848
1849
1850
1851
1852
1853 if (plen)
1854 src_key = &rt->rt6i_src.addr;
1855 #endif
1856 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1857 &rt->rt6i_dst.addr,
1858 src_key);
1859 if (rt6_ex) {
1860 rt6_remove_exception(bucket, rt6_ex);
1861 err = 0;
1862 } else {
1863 err = -ENOENT;
1864 }
1865
1866 spin_unlock_bh(&rt6_exception_lock);
1867 return err;
1868 }
1869
1870 struct fib6_nh_excptn_arg {
1871 struct rt6_info *rt;
1872 int plen;
1873 };
1874
1875 static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
1876 {
1877 struct fib6_nh_excptn_arg *arg = _arg;
1878 int err;
1879
1880 err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
1881 if (err == 0)
1882 return 1;
1883
1884 return 0;
1885 }
1886
1887 static int rt6_remove_exception_rt(struct rt6_info *rt)
1888 {
1889 struct fib6_info *from;
1890
1891 from = rcu_dereference(rt->from);
1892 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1893 return -EINVAL;
1894
1895 if (from->nh) {
1896 struct fib6_nh_excptn_arg arg = {
1897 .rt = rt,
1898 .plen = from->fib6_src.plen
1899 };
1900 int rc;
1901
1902
1903 rc = nexthop_for_each_fib6_nh(from->nh,
1904 rt6_nh_remove_exception_rt,
1905 &arg);
1906 return rc ? 0 : -ENOENT;
1907 }
1908
1909 return fib6_nh_remove_exception(from->fib6_nh,
1910 from->fib6_src.plen, rt);
1911 }
1912
1913
1914
1915
1916 static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
1917 const struct rt6_info *rt)
1918 {
1919 const struct in6_addr *src_key = NULL;
1920 struct rt6_exception_bucket *bucket;
1921 struct rt6_exception *rt6_ex;
1922
1923 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
1924 #ifdef CONFIG_IPV6_SUBTREES
1925
1926
1927
1928
1929
1930
1931 if (plen)
1932 src_key = &rt->rt6i_src.addr;
1933 #endif
1934 rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key);
1935 if (rt6_ex)
1936 rt6_ex->stamp = jiffies;
1937 }
1938
1939 struct fib6_nh_match_arg {
1940 const struct net_device *dev;
1941 const struct in6_addr *gw;
1942 struct fib6_nh *match;
1943 };
1944
1945
1946 static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
1947 {
1948 struct fib6_nh_match_arg *arg = _arg;
1949
1950 if (arg->dev != nh->fib_nh_dev ||
1951 (arg->gw && !nh->fib_nh_gw_family) ||
1952 (!arg->gw && nh->fib_nh_gw_family) ||
1953 (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
1954 return 0;
1955
1956 arg->match = nh;
1957
1958
1959 return 1;
1960 }
1961
1962 static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1963 {
1964 struct fib6_info *from;
1965 struct fib6_nh *fib6_nh;
1966
1967 rcu_read_lock();
1968
1969 from = rcu_dereference(rt->from);
1970 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1971 goto unlock;
1972
1973 if (from->nh) {
1974 struct fib6_nh_match_arg arg = {
1975 .dev = rt->dst.dev,
1976 .gw = &rt->rt6i_gateway,
1977 };
1978
1979 nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
1980
1981 if (!arg.match)
1982 goto unlock;
1983 fib6_nh = arg.match;
1984 } else {
1985 fib6_nh = from->fib6_nh;
1986 }
1987 fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
1988 unlock:
1989 rcu_read_unlock();
1990 }
1991
1992 static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1993 struct rt6_info *rt, int mtu)
1994 {
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005 if (dst_mtu(&rt->dst) >= mtu)
2006 return true;
2007
2008 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
2009 return true;
2010
2011 return false;
2012 }
2013
2014 static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
2015 const struct fib6_nh *nh, int mtu)
2016 {
2017 struct rt6_exception_bucket *bucket;
2018 struct rt6_exception *rt6_ex;
2019 int i;
2020
2021 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2022 if (!bucket)
2023 return;
2024
2025 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2026 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
2027 struct rt6_info *entry = rt6_ex->rt6i;
2028
2029
2030
2031
2032
2033 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
2034 rt6_mtu_change_route_allowed(idev, entry, mtu))
2035 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
2036 }
2037 bucket++;
2038 }
2039 }
2040
2041 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2042
2043 static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh,
2044 const struct in6_addr *gateway)
2045 {
2046 struct rt6_exception_bucket *bucket;
2047 struct rt6_exception *rt6_ex;
2048 struct hlist_node *tmp;
2049 int i;
2050
2051 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2052 return;
2053
2054 spin_lock_bh(&rt6_exception_lock);
2055 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2056 if (bucket) {
2057 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2058 hlist_for_each_entry_safe(rt6_ex, tmp,
2059 &bucket->chain, hlist) {
2060 struct rt6_info *entry = rt6_ex->rt6i;
2061
2062 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
2063 RTF_CACHE_GATEWAY &&
2064 ipv6_addr_equal(gateway,
2065 &entry->rt6i_gateway)) {
2066 rt6_remove_exception(bucket, rt6_ex);
2067 }
2068 }
2069 bucket++;
2070 }
2071 }
2072
2073 spin_unlock_bh(&rt6_exception_lock);
2074 }
2075
2076 static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
2077 struct rt6_exception *rt6_ex,
2078 struct fib6_gc_args *gc_args,
2079 unsigned long now)
2080 {
2081 struct rt6_info *rt = rt6_ex->rt6i;
2082
2083
2084
2085
2086
2087
2088
2089 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
2090 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
2091 RT6_TRACE("aging clone %p\n", rt);
2092 rt6_remove_exception(bucket, rt6_ex);
2093 return;
2094 }
2095 } else if (time_after(jiffies, rt->dst.expires)) {
2096 RT6_TRACE("purging expired route %p\n", rt);
2097 rt6_remove_exception(bucket, rt6_ex);
2098 return;
2099 }
2100
2101 if (rt->rt6i_flags & RTF_GATEWAY) {
2102 struct neighbour *neigh;
2103 __u8 neigh_flags = 0;
2104
2105 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
2106 if (neigh)
2107 neigh_flags = neigh->flags;
2108
2109 if (!(neigh_flags & NTF_ROUTER)) {
2110 RT6_TRACE("purging route %p via non-router but gateway\n",
2111 rt);
2112 rt6_remove_exception(bucket, rt6_ex);
2113 return;
2114 }
2115 }
2116
2117 gc_args->more++;
2118 }
2119
2120 static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
2121 struct fib6_gc_args *gc_args,
2122 unsigned long now)
2123 {
2124 struct rt6_exception_bucket *bucket;
2125 struct rt6_exception *rt6_ex;
2126 struct hlist_node *tmp;
2127 int i;
2128
2129 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2130 return;
2131
2132 rcu_read_lock_bh();
2133 spin_lock(&rt6_exception_lock);
2134 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2135 if (bucket) {
2136 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2137 hlist_for_each_entry_safe(rt6_ex, tmp,
2138 &bucket->chain, hlist) {
2139 rt6_age_examine_exception(bucket, rt6_ex,
2140 gc_args, now);
2141 }
2142 bucket++;
2143 }
2144 }
2145 spin_unlock(&rt6_exception_lock);
2146 rcu_read_unlock_bh();
2147 }
2148
2149 struct fib6_nh_age_excptn_arg {
2150 struct fib6_gc_args *gc_args;
2151 unsigned long now;
2152 };
2153
2154 static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
2155 {
2156 struct fib6_nh_age_excptn_arg *arg = _arg;
2157
2158 fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
2159 return 0;
2160 }
2161
2162 void rt6_age_exceptions(struct fib6_info *f6i,
2163 struct fib6_gc_args *gc_args,
2164 unsigned long now)
2165 {
2166 if (f6i->nh) {
2167 struct fib6_nh_age_excptn_arg arg = {
2168 .gc_args = gc_args,
2169 .now = now
2170 };
2171
2172 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
2173 &arg);
2174 } else {
2175 fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
2176 }
2177 }
2178
2179
2180 int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
2181 struct flowi6 *fl6, struct fib6_result *res, int strict)
2182 {
2183 struct fib6_node *fn, *saved_fn;
2184
2185 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2186 saved_fn = fn;
2187
2188 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2189 oif = 0;
2190
2191 redo_rt6_select:
2192 rt6_select(net, fn, oif, res, strict);
2193 if (res->f6i == net->ipv6.fib6_null_entry) {
2194 fn = fib6_backtrack(fn, &fl6->saddr);
2195 if (fn)
2196 goto redo_rt6_select;
2197 else if (strict & RT6_LOOKUP_F_REACHABLE) {
2198
2199 strict &= ~RT6_LOOKUP_F_REACHABLE;
2200 fn = saved_fn;
2201 goto redo_rt6_select;
2202 }
2203 }
2204
2205 trace_fib6_table_lookup(net, res, table, fl6);
2206
2207 return 0;
2208 }
2209
2210 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
2211 int oif, struct flowi6 *fl6,
2212 const struct sk_buff *skb, int flags)
2213 {
2214 struct fib6_result res = {};
2215 struct rt6_info *rt = NULL;
2216 int strict = 0;
2217
2218 WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) &&
2219 !rcu_read_lock_held());
2220
2221 strict |= flags & RT6_LOOKUP_F_IFACE;
2222 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
2223 if (net->ipv6.devconf_all->forwarding == 0)
2224 strict |= RT6_LOOKUP_F_REACHABLE;
2225
2226 rcu_read_lock();
2227
2228 fib6_table_lookup(net, table, oif, fl6, &res, strict);
2229 if (res.f6i == net->ipv6.fib6_null_entry)
2230 goto out;
2231
2232 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
2233
2234
2235 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
2236 if (rt) {
2237 goto out;
2238 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
2239 !res.nh->fib_nh_gw_family)) {
2240
2241
2242
2243
2244
2245 rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
2246
2247 if (rt) {
2248
2249
2250
2251
2252
2253 rt6_uncached_list_add(rt);
2254 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
2255 rcu_read_unlock();
2256
2257 return rt;
2258 }
2259 } else {
2260
2261 local_bh_disable();
2262 rt = rt6_get_pcpu_route(&res);
2263
2264 if (!rt)
2265 rt = rt6_make_pcpu_route(net, &res);
2266
2267 local_bh_enable();
2268 }
2269 out:
2270 if (!rt)
2271 rt = net->ipv6.ip6_null_entry;
2272 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
2273 ip6_hold_safe(net, &rt);
2274 rcu_read_unlock();
2275
2276 return rt;
2277 }
2278 EXPORT_SYMBOL_GPL(ip6_pol_route);
2279
2280 static struct rt6_info *ip6_pol_route_input(struct net *net,
2281 struct fib6_table *table,
2282 struct flowi6 *fl6,
2283 const struct sk_buff *skb,
2284 int flags)
2285 {
2286 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
2287 }
2288
2289 struct dst_entry *ip6_route_input_lookup(struct net *net,
2290 struct net_device *dev,
2291 struct flowi6 *fl6,
2292 const struct sk_buff *skb,
2293 int flags)
2294 {
2295 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
2296 flags |= RT6_LOOKUP_F_IFACE;
2297
2298 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
2299 }
2300 EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
2301
2302 static void ip6_multipath_l3_keys(const struct sk_buff *skb,
2303 struct flow_keys *keys,
2304 struct flow_keys *flkeys)
2305 {
2306 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
2307 const struct ipv6hdr *key_iph = outer_iph;
2308 struct flow_keys *_flkeys = flkeys;
2309 const struct ipv6hdr *inner_iph;
2310 const struct icmp6hdr *icmph;
2311 struct ipv6hdr _inner_iph;
2312 struct icmp6hdr _icmph;
2313
2314 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2315 goto out;
2316
2317 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2318 sizeof(_icmph), &_icmph);
2319 if (!icmph)
2320 goto out;
2321
2322 if (icmph->icmp6_type != ICMPV6_DEST_UNREACH &&
2323 icmph->icmp6_type != ICMPV6_PKT_TOOBIG &&
2324 icmph->icmp6_type != ICMPV6_TIME_EXCEED &&
2325 icmph->icmp6_type != ICMPV6_PARAMPROB)
2326 goto out;
2327
2328 inner_iph = skb_header_pointer(skb,
2329 skb_transport_offset(skb) + sizeof(*icmph),
2330 sizeof(_inner_iph), &_inner_iph);
2331 if (!inner_iph)
2332 goto out;
2333
2334 key_iph = inner_iph;
2335 _flkeys = NULL;
2336 out:
2337 if (_flkeys) {
2338 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2339 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2340 keys->tags.flow_label = _flkeys->tags.flow_label;
2341 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2342 } else {
2343 keys->addrs.v6addrs.src = key_iph->saddr;
2344 keys->addrs.v6addrs.dst = key_iph->daddr;
2345 keys->tags.flow_label = ip6_flowlabel(key_iph);
2346 keys->basic.ip_proto = key_iph->nexthdr;
2347 }
2348 }
2349
2350
2351 u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2352 const struct sk_buff *skb, struct flow_keys *flkeys)
2353 {
2354 struct flow_keys hash_keys;
2355 u32 mhash;
2356
2357 switch (ip6_multipath_hash_policy(net)) {
2358 case 0:
2359 memset(&hash_keys, 0, sizeof(hash_keys));
2360 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2361 if (skb) {
2362 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2363 } else {
2364 hash_keys.addrs.v6addrs.src = fl6->saddr;
2365 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2366 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2367 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2368 }
2369 break;
2370 case 1:
2371 if (skb) {
2372 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2373 struct flow_keys keys;
2374
2375
2376 if (skb->l4_hash)
2377 return skb_get_hash_raw(skb) >> 1;
2378
2379 memset(&hash_keys, 0, sizeof(hash_keys));
2380
2381 if (!flkeys) {
2382 skb_flow_dissect_flow_keys(skb, &keys, flag);
2383 flkeys = &keys;
2384 }
2385 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2386 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2387 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2388 hash_keys.ports.src = flkeys->ports.src;
2389 hash_keys.ports.dst = flkeys->ports.dst;
2390 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2391 } else {
2392 memset(&hash_keys, 0, sizeof(hash_keys));
2393 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2394 hash_keys.addrs.v6addrs.src = fl6->saddr;
2395 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2396 hash_keys.ports.src = fl6->fl6_sport;
2397 hash_keys.ports.dst = fl6->fl6_dport;
2398 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2399 }
2400 break;
2401 case 2:
2402 memset(&hash_keys, 0, sizeof(hash_keys));
2403 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2404 if (skb) {
2405 struct flow_keys keys;
2406
2407 if (!flkeys) {
2408 skb_flow_dissect_flow_keys(skb, &keys, 0);
2409 flkeys = &keys;
2410 }
2411
2412
2413 if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2414 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2415 hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;
2416 hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;
2417 } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2418 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2419 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2420 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2421 hash_keys.tags.flow_label = flkeys->tags.flow_label;
2422 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2423 } else {
2424
2425 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2426 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2427 }
2428 } else {
2429
2430 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2431 hash_keys.addrs.v6addrs.src = fl6->saddr;
2432 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2433 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2434 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2435 }
2436 break;
2437 }
2438 mhash = flow_hash_from_keys(&hash_keys);
2439
2440 return mhash >> 1;
2441 }
2442
2443
2444 void ip6_route_input(struct sk_buff *skb)
2445 {
2446 const struct ipv6hdr *iph = ipv6_hdr(skb);
2447 struct net *net = dev_net(skb->dev);
2448 int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF;
2449 struct ip_tunnel_info *tun_info;
2450 struct flowi6 fl6 = {
2451 .flowi6_iif = skb->dev->ifindex,
2452 .daddr = iph->daddr,
2453 .saddr = iph->saddr,
2454 .flowlabel = ip6_flowinfo(iph),
2455 .flowi6_mark = skb->mark,
2456 .flowi6_proto = iph->nexthdr,
2457 };
2458 struct flow_keys *flkeys = NULL, _flkeys;
2459
2460 tun_info = skb_tunnel_info(skb);
2461 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
2462 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
2463
2464 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2465 flkeys = &_flkeys;
2466
2467 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
2468 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
2469 skb_dst_drop(skb);
2470 skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev,
2471 &fl6, skb, flags));
2472 }
2473
2474 static struct rt6_info *ip6_pol_route_output(struct net *net,
2475 struct fib6_table *table,
2476 struct flowi6 *fl6,
2477 const struct sk_buff *skb,
2478 int flags)
2479 {
2480 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
2481 }
2482
2483 struct dst_entry *ip6_route_output_flags_noref(struct net *net,
2484 const struct sock *sk,
2485 struct flowi6 *fl6, int flags)
2486 {
2487 bool any_src;
2488
2489 if (ipv6_addr_type(&fl6->daddr) &
2490 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
2491 struct dst_entry *dst;
2492
2493
2494 dst = l3mdev_link_scope_lookup(net, fl6);
2495 if (dst)
2496 return dst;
2497 }
2498
2499 fl6->flowi6_iif = LOOPBACK_IFINDEX;
2500
2501 flags |= RT6_LOOKUP_F_DST_NOREF;
2502 any_src = ipv6_addr_any(&fl6->saddr);
2503 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
2504 (fl6->flowi6_oif && any_src))
2505 flags |= RT6_LOOKUP_F_IFACE;
2506
2507 if (!any_src)
2508 flags |= RT6_LOOKUP_F_HAS_SADDR;
2509 else if (sk)
2510 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
2511
2512 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
2513 }
2514 EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref);
2515
2516 struct dst_entry *ip6_route_output_flags(struct net *net,
2517 const struct sock *sk,
2518 struct flowi6 *fl6,
2519 int flags)
2520 {
2521 struct dst_entry *dst;
2522 struct rt6_info *rt6;
2523
2524 rcu_read_lock();
2525 dst = ip6_route_output_flags_noref(net, sk, fl6, flags);
2526 rt6 = (struct rt6_info *)dst;
2527
2528 if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) {
2529 dst = &net->ipv6.ip6_null_entry->dst;
2530 dst_hold(dst);
2531 }
2532 rcu_read_unlock();
2533
2534 return dst;
2535 }
2536 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
2537
2538 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
2539 {
2540 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
2541 struct net_device *loopback_dev = net->loopback_dev;
2542 struct dst_entry *new = NULL;
2543
2544 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
2545 DST_OBSOLETE_DEAD, 0);
2546 if (rt) {
2547 rt6_info_init(rt);
2548 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
2549
2550 new = &rt->dst;
2551 new->__use = 1;
2552 new->input = dst_discard;
2553 new->output = dst_discard_out;
2554
2555 dst_copy_metrics(new, &ort->dst);
2556
2557 rt->rt6i_idev = in6_dev_get(loopback_dev);
2558 rt->rt6i_gateway = ort->rt6i_gateway;
2559 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
2560
2561 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2562 #ifdef CONFIG_IPV6_SUBTREES
2563 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2564 #endif
2565 }
2566
2567 dst_release(dst_orig);
2568 return new ? new : ERR_PTR(-ENOMEM);
2569 }
2570
2571
2572
2573
2574
2575 static bool fib6_check(struct fib6_info *f6i, u32 cookie)
2576 {
2577 u32 rt_cookie = 0;
2578
2579 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
2580 return false;
2581
2582 if (fib6_check_expired(f6i))
2583 return false;
2584
2585 return true;
2586 }
2587
2588 static struct dst_entry *rt6_check(struct rt6_info *rt,
2589 struct fib6_info *from,
2590 u32 cookie)
2591 {
2592 u32 rt_cookie = 0;
2593
2594 if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
2595 rt_cookie != cookie)
2596 return NULL;
2597
2598 if (rt6_check_expired(rt))
2599 return NULL;
2600
2601 return &rt->dst;
2602 }
2603
2604 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2605 struct fib6_info *from,
2606 u32 cookie)
2607 {
2608 if (!__rt6_check_expired(rt) &&
2609 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
2610 fib6_check(from, cookie))
2611 return &rt->dst;
2612 else
2613 return NULL;
2614 }
2615
2616 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
2617 {
2618 struct dst_entry *dst_ret;
2619 struct fib6_info *from;
2620 struct rt6_info *rt;
2621
2622 rt = container_of(dst, struct rt6_info, dst);
2623
2624 if (rt->sernum)
2625 return rt6_is_valid(rt) ? dst : NULL;
2626
2627 rcu_read_lock();
2628
2629
2630
2631
2632
2633
2634 from = rcu_dereference(rt->from);
2635
2636 if (from && (rt->rt6i_flags & RTF_PCPU ||
2637 unlikely(!list_empty(&rt->rt6i_uncached))))
2638 dst_ret = rt6_dst_from_check(rt, from, cookie);
2639 else
2640 dst_ret = rt6_check(rt, from, cookie);
2641
2642 rcu_read_unlock();
2643
2644 return dst_ret;
2645 }
2646
2647 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2648 {
2649 struct rt6_info *rt = (struct rt6_info *) dst;
2650
2651 if (rt) {
2652 if (rt->rt6i_flags & RTF_CACHE) {
2653 rcu_read_lock();
2654 if (rt6_check_expired(rt)) {
2655 rt6_remove_exception_rt(rt);
2656 dst = NULL;
2657 }
2658 rcu_read_unlock();
2659 } else {
2660 dst_release(dst);
2661 dst = NULL;
2662 }
2663 }
2664 return dst;
2665 }
2666
2667 static void ip6_link_failure(struct sk_buff *skb)
2668 {
2669 struct rt6_info *rt;
2670
2671 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
2672
2673 rt = (struct rt6_info *) skb_dst(skb);
2674 if (rt) {
2675 rcu_read_lock();
2676 if (rt->rt6i_flags & RTF_CACHE) {
2677 rt6_remove_exception_rt(rt);
2678 } else {
2679 struct fib6_info *from;
2680 struct fib6_node *fn;
2681
2682 from = rcu_dereference(rt->from);
2683 if (from) {
2684 fn = rcu_dereference(from->fib6_node);
2685 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2686 fn->fn_sernum = -1;
2687 }
2688 }
2689 rcu_read_unlock();
2690 }
2691 }
2692
2693 static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2694 {
2695 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2696 struct fib6_info *from;
2697
2698 rcu_read_lock();
2699 from = rcu_dereference(rt0->from);
2700 if (from)
2701 rt0->dst.expires = from->expires;
2702 rcu_read_unlock();
2703 }
2704
2705 dst_set_expires(&rt0->dst, timeout);
2706 rt0->rt6i_flags |= RTF_EXPIRES;
2707 }
2708
2709 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2710 {
2711 struct net *net = dev_net(rt->dst.dev);
2712
2713 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
2714 rt->rt6i_flags |= RTF_MODIFIED;
2715 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2716 }
2717
2718 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2719 {
2720 return !(rt->rt6i_flags & RTF_CACHE) &&
2721 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
2722 }
2723
2724 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
2725 const struct ipv6hdr *iph, u32 mtu,
2726 bool confirm_neigh)
2727 {
2728 const struct in6_addr *daddr, *saddr;
2729 struct rt6_info *rt6 = (struct rt6_info *)dst;
2730
2731
2732
2733
2734
2735
2736 if (iph) {
2737 daddr = &iph->daddr;
2738 saddr = &iph->saddr;
2739 } else if (sk) {
2740 daddr = &sk->sk_v6_daddr;
2741 saddr = &inet6_sk(sk)->saddr;
2742 } else {
2743 daddr = NULL;
2744 saddr = NULL;
2745 }
2746
2747 if (confirm_neigh)
2748 dst_confirm_neigh(dst, daddr);
2749
2750 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
2751 if (mtu >= dst_mtu(dst))
2752 return;
2753
2754 if (!rt6_cache_allowed_for_pmtu(rt6)) {
2755 rt6_do_update_pmtu(rt6, mtu);
2756
2757 if (rt6->rt6i_flags & RTF_CACHE)
2758 rt6_update_exception_stamp_rt(rt6);
2759 } else if (daddr) {
2760 struct fib6_result res = {};
2761 struct rt6_info *nrt6;
2762
2763 rcu_read_lock();
2764 res.f6i = rcu_dereference(rt6->from);
2765 if (!res.f6i)
2766 goto out_unlock;
2767
2768 res.fib6_flags = res.f6i->fib6_flags;
2769 res.fib6_type = res.f6i->fib6_type;
2770
2771 if (res.f6i->nh) {
2772 struct fib6_nh_match_arg arg = {
2773 .dev = dst->dev,
2774 .gw = &rt6->rt6i_gateway,
2775 };
2776
2777 nexthop_for_each_fib6_nh(res.f6i->nh,
2778 fib6_nh_find_match, &arg);
2779
2780
2781
2782
2783 if (!arg.match)
2784 goto out_unlock;
2785
2786 res.nh = arg.match;
2787 } else {
2788 res.nh = res.f6i->fib6_nh;
2789 }
2790
2791 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
2792 if (nrt6) {
2793 rt6_do_update_pmtu(nrt6, mtu);
2794 if (rt6_insert_exception(nrt6, &res))
2795 dst_release_immediate(&nrt6->dst);
2796 }
2797 out_unlock:
2798 rcu_read_unlock();
2799 }
2800 }
2801
2802 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
2803 struct sk_buff *skb, u32 mtu,
2804 bool confirm_neigh)
2805 {
2806 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu,
2807 confirm_neigh);
2808 }
2809
2810 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
2811 int oif, u32 mark, kuid_t uid)
2812 {
2813 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2814 struct dst_entry *dst;
2815 struct flowi6 fl6 = {
2816 .flowi6_oif = oif,
2817 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2818 .daddr = iph->daddr,
2819 .saddr = iph->saddr,
2820 .flowlabel = ip6_flowinfo(iph),
2821 .flowi6_uid = uid,
2822 };
2823
2824 dst = ip6_route_output(net, NULL, &fl6);
2825 if (!dst->error)
2826 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true);
2827 dst_release(dst);
2828 }
2829 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2830
2831 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2832 {
2833 int oif = sk->sk_bound_dev_if;
2834 struct dst_entry *dst;
2835
2836 if (!oif && skb->dev)
2837 oif = l3mdev_master_ifindex(skb->dev);
2838
2839 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
2840
2841 dst = __sk_dst_get(sk);
2842 if (!dst || !dst->obsolete ||
2843 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2844 return;
2845
2846 bh_lock_sock(sk);
2847 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2848 ip6_datagram_dst_update(sk, false);
2849 bh_unlock_sock(sk);
2850 }
2851 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2852
2853 void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2854 const struct flowi6 *fl6)
2855 {
2856 #ifdef CONFIG_IPV6_SUBTREES
2857 struct ipv6_pinfo *np = inet6_sk(sk);
2858 #endif
2859
2860 ip6_dst_store(sk, dst,
2861 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2862 &sk->sk_v6_daddr : NULL,
2863 #ifdef CONFIG_IPV6_SUBTREES
2864 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2865 &np->saddr :
2866 #endif
2867 NULL);
2868 }
2869
2870 static bool ip6_redirect_nh_match(const struct fib6_result *res,
2871 struct flowi6 *fl6,
2872 const struct in6_addr *gw,
2873 struct rt6_info **ret)
2874 {
2875 const struct fib6_nh *nh = res->nh;
2876
2877 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2878 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2879 return false;
2880
2881
2882
2883
2884
2885
2886 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
2887 struct rt6_info *rt_cache;
2888
2889 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
2890 if (rt_cache &&
2891 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
2892 *ret = rt_cache;
2893 return true;
2894 }
2895 return false;
2896 }
2897 return true;
2898 }
2899
2900 struct fib6_nh_rd_arg {
2901 struct fib6_result *res;
2902 struct flowi6 *fl6;
2903 const struct in6_addr *gw;
2904 struct rt6_info **ret;
2905 };
2906
2907 static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg)
2908 {
2909 struct fib6_nh_rd_arg *arg = _arg;
2910
2911 arg->res->nh = nh;
2912 return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret);
2913 }
2914
2915
2916 struct ip6rd_flowi {
2917 struct flowi6 fl6;
2918 struct in6_addr gateway;
2919 };
2920
2921 static struct rt6_info *__ip6_route_redirect(struct net *net,
2922 struct fib6_table *table,
2923 struct flowi6 *fl6,
2924 const struct sk_buff *skb,
2925 int flags)
2926 {
2927 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
2928 struct rt6_info *ret = NULL;
2929 struct fib6_result res = {};
2930 struct fib6_nh_rd_arg arg = {
2931 .res = &res,
2932 .fl6 = fl6,
2933 .gw = &rdfl->gateway,
2934 .ret = &ret
2935 };
2936 struct fib6_info *rt;
2937 struct fib6_node *fn;
2938
2939
2940
2941
2942 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2943 fl6->flowi6_oif = skb->dev->ifindex;
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955 rcu_read_lock();
2956 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2957 restart:
2958 for_each_fib6_node_rt_rcu(fn) {
2959 res.f6i = rt;
2960 if (fib6_check_expired(rt))
2961 continue;
2962 if (rt->fib6_flags & RTF_REJECT)
2963 break;
2964 if (unlikely(rt->nh)) {
2965 if (nexthop_is_blackhole(rt->nh))
2966 continue;
2967
2968 if (nexthop_for_each_fib6_nh(rt->nh,
2969 fib6_nh_redirect_match,
2970 &arg))
2971 goto out;
2972 } else {
2973 res.nh = rt->fib6_nh;
2974 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway,
2975 &ret))
2976 goto out;
2977 }
2978 }
2979
2980 if (!rt)
2981 rt = net->ipv6.fib6_null_entry;
2982 else if (rt->fib6_flags & RTF_REJECT) {
2983 ret = net->ipv6.ip6_null_entry;
2984 goto out;
2985 }
2986
2987 if (rt == net->ipv6.fib6_null_entry) {
2988 fn = fib6_backtrack(fn, &fl6->saddr);
2989 if (fn)
2990 goto restart;
2991 }
2992
2993 res.f6i = rt;
2994 res.nh = rt->fib6_nh;
2995 out:
2996 if (ret) {
2997 ip6_hold_safe(net, &ret);
2998 } else {
2999 res.fib6_flags = res.f6i->fib6_flags;
3000 res.fib6_type = res.f6i->fib6_type;
3001 ret = ip6_create_rt_rcu(&res);
3002 }
3003
3004 rcu_read_unlock();
3005
3006 trace_fib6_table_lookup(net, &res, table, fl6);
3007 return ret;
3008 };
3009
3010 static struct dst_entry *ip6_route_redirect(struct net *net,
3011 const struct flowi6 *fl6,
3012 const struct sk_buff *skb,
3013 const struct in6_addr *gateway)
3014 {
3015 int flags = RT6_LOOKUP_F_HAS_SADDR;
3016 struct ip6rd_flowi rdfl;
3017
3018 rdfl.fl6 = *fl6;
3019 rdfl.gateway = *gateway;
3020
3021 return fib6_rule_lookup(net, &rdfl.fl6, skb,
3022 flags, __ip6_route_redirect);
3023 }
3024
3025 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
3026 kuid_t uid)
3027 {
3028 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
3029 struct dst_entry *dst;
3030 struct flowi6 fl6 = {
3031 .flowi6_iif = LOOPBACK_IFINDEX,
3032 .flowi6_oif = oif,
3033 .flowi6_mark = mark,
3034 .daddr = iph->daddr,
3035 .saddr = iph->saddr,
3036 .flowlabel = ip6_flowinfo(iph),
3037 .flowi6_uid = uid,
3038 };
3039
3040 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
3041 rt6_do_redirect(dst, NULL, skb);
3042 dst_release(dst);
3043 }
3044 EXPORT_SYMBOL_GPL(ip6_redirect);
3045
3046 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
3047 {
3048 const struct ipv6hdr *iph = ipv6_hdr(skb);
3049 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
3050 struct dst_entry *dst;
3051 struct flowi6 fl6 = {
3052 .flowi6_iif = LOOPBACK_IFINDEX,
3053 .flowi6_oif = oif,
3054 .daddr = msg->dest,
3055 .saddr = iph->daddr,
3056 .flowi6_uid = sock_net_uid(net, NULL),
3057 };
3058
3059 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
3060 rt6_do_redirect(dst, NULL, skb);
3061 dst_release(dst);
3062 }
3063
3064 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
3065 {
3066 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
3067 sk->sk_uid);
3068 }
3069 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
3070
3071 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
3072 {
3073 struct net_device *dev = dst->dev;
3074 unsigned int mtu = dst_mtu(dst);
3075 struct net *net = dev_net(dev);
3076
3077 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
3078
3079 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
3080 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
3081
3082
3083
3084
3085
3086
3087
3088 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
3089 mtu = IPV6_MAXPLEN;
3090 return mtu;
3091 }
3092
3093 static unsigned int ip6_mtu(const struct dst_entry *dst)
3094 {
3095 struct inet6_dev *idev;
3096 unsigned int mtu;
3097
3098 mtu = dst_metric_raw(dst, RTAX_MTU);
3099 if (mtu)
3100 goto out;
3101
3102 mtu = IPV6_MIN_MTU;
3103
3104 rcu_read_lock();
3105 idev = __in6_dev_get(dst->dev);
3106 if (idev)
3107 mtu = idev->cnf.mtu6;
3108 rcu_read_unlock();
3109
3110 out:
3111 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3112
3113 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
3114 }
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124 u32 ip6_mtu_from_fib6(const struct fib6_result *res,
3125 const struct in6_addr *daddr,
3126 const struct in6_addr *saddr)
3127 {
3128 const struct fib6_nh *nh = res->nh;
3129 struct fib6_info *f6i = res->f6i;
3130 struct inet6_dev *idev;
3131 struct rt6_info *rt;
3132 u32 mtu = 0;
3133
3134 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
3135 mtu = f6i->fib6_pmtu;
3136 if (mtu)
3137 goto out;
3138 }
3139
3140 rt = rt6_find_cached_rt(res, daddr, saddr);
3141 if (unlikely(rt)) {
3142 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
3143 } else {
3144 struct net_device *dev = nh->fib_nh_dev;
3145
3146 mtu = IPV6_MIN_MTU;
3147 idev = __in6_dev_get(dev);
3148 if (idev && idev->cnf.mtu6 > mtu)
3149 mtu = idev->cnf.mtu6;
3150 }
3151
3152 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3153 out:
3154 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
3155 }
3156
3157 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
3158 struct flowi6 *fl6)
3159 {
3160 struct dst_entry *dst;
3161 struct rt6_info *rt;
3162 struct inet6_dev *idev = in6_dev_get(dev);
3163 struct net *net = dev_net(dev);
3164
3165 if (unlikely(!idev))
3166 return ERR_PTR(-ENODEV);
3167
3168 rt = ip6_dst_alloc(net, dev, 0);
3169 if (unlikely(!rt)) {
3170 in6_dev_put(idev);
3171 dst = ERR_PTR(-ENOMEM);
3172 goto out;
3173 }
3174
3175 rt->dst.flags |= DST_HOST;
3176 rt->dst.input = ip6_input;
3177 rt->dst.output = ip6_output;
3178 rt->rt6i_gateway = fl6->daddr;
3179 rt->rt6i_dst.addr = fl6->daddr;
3180 rt->rt6i_dst.plen = 128;
3181 rt->rt6i_idev = idev;
3182 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
3183
3184
3185
3186
3187 rt6_uncached_list_add(rt);
3188 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
3189
3190 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
3191
3192 out:
3193 return dst;
3194 }
3195
3196 static int ip6_dst_gc(struct dst_ops *ops)
3197 {
3198 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
3199 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
3200 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
3201 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
3202 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
3203 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
3204 int entries;
3205
3206 entries = dst_entries_get_fast(ops);
3207 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
3208 entries <= rt_max_size)
3209 goto out;
3210
3211 net->ipv6.ip6_rt_gc_expire++;
3212 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
3213 entries = dst_entries_get_slow(ops);
3214 if (entries < ops->gc_thresh)
3215 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
3216 out:
3217 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
3218 return entries > rt_max_size;
3219 }
3220
3221 static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
3222 const struct in6_addr *gw_addr, u32 tbid,
3223 int flags, struct fib6_result *res)
3224 {
3225 struct flowi6 fl6 = {
3226 .flowi6_oif = cfg->fc_ifindex,
3227 .daddr = *gw_addr,
3228 .saddr = cfg->fc_prefsrc,
3229 };
3230 struct fib6_table *table;
3231 int err;
3232
3233 table = fib6_get_table(net, tbid);
3234 if (!table)
3235 return -EINVAL;
3236
3237 if (!ipv6_addr_any(&cfg->fc_prefsrc))
3238 flags |= RT6_LOOKUP_F_HAS_SADDR;
3239
3240 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
3241
3242 err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags);
3243 if (!err && res->f6i != net->ipv6.fib6_null_entry)
3244 fib6_select_path(net, res, &fl6, cfg->fc_ifindex,
3245 cfg->fc_ifindex != 0, NULL, flags);
3246
3247 return err;
3248 }
3249
3250 static int ip6_route_check_nh_onlink(struct net *net,
3251 struct fib6_config *cfg,
3252 const struct net_device *dev,
3253 struct netlink_ext_ack *extack)
3254 {
3255 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
3256 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3257 struct fib6_result res = {};
3258 int err;
3259
3260 err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res);
3261 if (!err && !(res.fib6_flags & RTF_REJECT) &&
3262
3263 !ipv6_addr_any(&res.f6i->fib6_dst.addr) &&
3264 (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) {
3265 NL_SET_ERR_MSG(extack,
3266 "Nexthop has invalid gateway or device mismatch");
3267 err = -EINVAL;
3268 }
3269
3270 return err;
3271 }
3272
3273 static int ip6_route_check_nh(struct net *net,
3274 struct fib6_config *cfg,
3275 struct net_device **_dev,
3276 struct inet6_dev **idev)
3277 {
3278 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3279 struct net_device *dev = _dev ? *_dev : NULL;
3280 int flags = RT6_LOOKUP_F_IFACE;
3281 struct fib6_result res = {};
3282 int err = -EHOSTUNREACH;
3283
3284 if (cfg->fc_table) {
3285 err = ip6_nh_lookup_table(net, cfg, gw_addr,
3286 cfg->fc_table, flags, &res);
3287
3288
3289
3290 if (err || res.fib6_flags & RTF_REJECT ||
3291 res.nh->fib_nh_gw_family ||
3292 (dev && dev != res.nh->fib_nh_dev))
3293 err = -EHOSTUNREACH;
3294 }
3295
3296 if (err < 0) {
3297 struct flowi6 fl6 = {
3298 .flowi6_oif = cfg->fc_ifindex,
3299 .daddr = *gw_addr,
3300 };
3301
3302 err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags);
3303 if (err || res.fib6_flags & RTF_REJECT ||
3304 res.nh->fib_nh_gw_family)
3305 err = -EHOSTUNREACH;
3306
3307 if (err)
3308 return err;
3309
3310 fib6_select_path(net, &res, &fl6, cfg->fc_ifindex,
3311 cfg->fc_ifindex != 0, NULL, flags);
3312 }
3313
3314 err = 0;
3315 if (dev) {
3316 if (dev != res.nh->fib_nh_dev)
3317 err = -EHOSTUNREACH;
3318 } else {
3319 *_dev = dev = res.nh->fib_nh_dev;
3320 dev_hold(dev);
3321 *idev = in6_dev_get(dev);
3322 }
3323
3324 return err;
3325 }
3326
3327 static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
3328 struct net_device **_dev, struct inet6_dev **idev,
3329 struct netlink_ext_ack *extack)
3330 {
3331 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3332 int gwa_type = ipv6_addr_type(gw_addr);
3333 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
3334 const struct net_device *dev = *_dev;
3335 bool need_addr_check = !dev;
3336 int err = -EINVAL;
3337
3338
3339
3340
3341
3342
3343 if (dev &&
3344 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3345 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3346 goto out;
3347 }
3348
3349 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
3360 NL_SET_ERR_MSG(extack, "Invalid gateway address");
3361 goto out;
3362 }
3363
3364 rcu_read_lock();
3365
3366 if (cfg->fc_flags & RTNH_F_ONLINK)
3367 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
3368 else
3369 err = ip6_route_check_nh(net, cfg, _dev, idev);
3370
3371 rcu_read_unlock();
3372
3373 if (err)
3374 goto out;
3375 }
3376
3377
3378 dev = *_dev;
3379
3380 err = -EINVAL;
3381 if (!dev) {
3382 NL_SET_ERR_MSG(extack, "Egress device not specified");
3383 goto out;
3384 } else if (dev->flags & IFF_LOOPBACK) {
3385 NL_SET_ERR_MSG(extack,
3386 "Egress device can not be loopback device for this route");
3387 goto out;
3388 }
3389
3390
3391
3392
3393 if (need_addr_check &&
3394 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3395 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3396 goto out;
3397 }
3398
3399 err = 0;
3400 out:
3401 return err;
3402 }
3403
3404 static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
3405 {
3406 if ((flags & RTF_REJECT) ||
3407 (dev && (dev->flags & IFF_LOOPBACK) &&
3408 !(addr_type & IPV6_ADDR_LOOPBACK) &&
3409 !(flags & RTF_LOCAL)))
3410 return true;
3411
3412 return false;
3413 }
3414
3415 int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
3416 struct fib6_config *cfg, gfp_t gfp_flags,
3417 struct netlink_ext_ack *extack)
3418 {
3419 struct net_device *dev = NULL;
3420 struct inet6_dev *idev = NULL;
3421 int addr_type;
3422 int err;
3423
3424 fib6_nh->fib_nh_family = AF_INET6;
3425 #ifdef CONFIG_IPV6_ROUTER_PREF
3426 fib6_nh->last_probe = jiffies;
3427 #endif
3428
3429 err = -ENODEV;
3430 if (cfg->fc_ifindex) {
3431 dev = dev_get_by_index(net, cfg->fc_ifindex);
3432 if (!dev)
3433 goto out;
3434 idev = in6_dev_get(dev);
3435 if (!idev)
3436 goto out;
3437 }
3438
3439 if (cfg->fc_flags & RTNH_F_ONLINK) {
3440 if (!dev) {
3441 NL_SET_ERR_MSG(extack,
3442 "Nexthop device required for onlink");
3443 goto out;
3444 }
3445
3446 if (!(dev->flags & IFF_UP)) {
3447 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3448 err = -ENETDOWN;
3449 goto out;
3450 }
3451
3452 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
3453 }
3454
3455 fib6_nh->fib_nh_weight = 1;
3456
3457
3458
3459
3460 addr_type = ipv6_addr_type(&cfg->fc_dst);
3461 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3462
3463 if (dev != net->loopback_dev) {
3464 if (dev) {
3465 dev_put(dev);
3466 in6_dev_put(idev);
3467 }
3468 dev = net->loopback_dev;
3469 dev_hold(dev);
3470 idev = in6_dev_get(dev);
3471 if (!idev) {
3472 err = -ENODEV;
3473 goto out;
3474 }
3475 }
3476 goto pcpu_alloc;
3477 }
3478
3479 if (cfg->fc_flags & RTF_GATEWAY) {
3480 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3481 if (err)
3482 goto out;
3483
3484 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3485 fib6_nh->fib_nh_gw_family = AF_INET6;
3486 }
3487
3488 err = -ENODEV;
3489 if (!dev)
3490 goto out;
3491
3492 if (idev->cnf.disable_ipv6) {
3493 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3494 err = -EACCES;
3495 goto out;
3496 }
3497
3498 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3499 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3500 err = -ENETDOWN;
3501 goto out;
3502 }
3503
3504 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3505 !netif_carrier_ok(dev))
3506 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
3507
3508 err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
3509 cfg->fc_encap_type, cfg, gfp_flags, extack);
3510 if (err)
3511 goto out;
3512
3513 pcpu_alloc:
3514 fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
3515 if (!fib6_nh->rt6i_pcpu) {
3516 err = -ENOMEM;
3517 goto out;
3518 }
3519
3520 fib6_nh->fib_nh_dev = dev;
3521 fib6_nh->fib_nh_oif = dev->ifindex;
3522 err = 0;
3523 out:
3524 if (idev)
3525 in6_dev_put(idev);
3526
3527 if (err) {
3528 lwtstate_put(fib6_nh->fib_nh_lws);
3529 fib6_nh->fib_nh_lws = NULL;
3530 if (dev)
3531 dev_put(dev);
3532 }
3533
3534 return err;
3535 }
3536
3537 void fib6_nh_release(struct fib6_nh *fib6_nh)
3538 {
3539 struct rt6_exception_bucket *bucket;
3540
3541 rcu_read_lock();
3542
3543 fib6_nh_flush_exceptions(fib6_nh, NULL);
3544 bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL);
3545 if (bucket) {
3546 rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL);
3547 kfree(bucket);
3548 }
3549
3550 rcu_read_unlock();
3551
3552 if (fib6_nh->rt6i_pcpu) {
3553 int cpu;
3554
3555 for_each_possible_cpu(cpu) {
3556 struct rt6_info **ppcpu_rt;
3557 struct rt6_info *pcpu_rt;
3558
3559 ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
3560 pcpu_rt = *ppcpu_rt;
3561 if (pcpu_rt) {
3562 dst_dev_put(&pcpu_rt->dst);
3563 dst_release(&pcpu_rt->dst);
3564 *ppcpu_rt = NULL;
3565 }
3566 }
3567
3568 free_percpu(fib6_nh->rt6i_pcpu);
3569 }
3570
3571 fib_nh_common_release(&fib6_nh->nh_common);
3572 }
3573
3574 static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
3575 gfp_t gfp_flags,
3576 struct netlink_ext_ack *extack)
3577 {
3578 struct net *net = cfg->fc_nlinfo.nl_net;
3579 struct fib6_info *rt = NULL;
3580 struct nexthop *nh = NULL;
3581 struct fib6_table *table;
3582 struct fib6_nh *fib6_nh;
3583 int err = -EINVAL;
3584 int addr_type;
3585
3586
3587 if (cfg->fc_flags & RTF_PCPU) {
3588 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
3589 goto out;
3590 }
3591
3592
3593 if (cfg->fc_flags & RTF_CACHE) {
3594 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3595 goto out;
3596 }
3597
3598 if (cfg->fc_type > RTN_MAX) {
3599 NL_SET_ERR_MSG(extack, "Invalid route type");
3600 goto out;
3601 }
3602
3603 if (cfg->fc_dst_len > 128) {
3604 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3605 goto out;
3606 }
3607 if (cfg->fc_src_len > 128) {
3608 NL_SET_ERR_MSG(extack, "Invalid source address length");
3609 goto out;
3610 }
3611 #ifndef CONFIG_IPV6_SUBTREES
3612 if (cfg->fc_src_len) {
3613 NL_SET_ERR_MSG(extack,
3614 "Specifying source address requires IPV6_SUBTREES to be enabled");
3615 goto out;
3616 }
3617 #endif
3618 if (cfg->fc_nh_id) {
3619 nh = nexthop_find_by_id(net, cfg->fc_nh_id);
3620 if (!nh) {
3621 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
3622 goto out;
3623 }
3624 err = fib6_check_nexthop(nh, cfg, extack);
3625 if (err)
3626 goto out;
3627 }
3628
3629 err = -ENOBUFS;
3630 if (cfg->fc_nlinfo.nlh &&
3631 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
3632 table = fib6_get_table(net, cfg->fc_table);
3633 if (!table) {
3634 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
3635 table = fib6_new_table(net, cfg->fc_table);
3636 }
3637 } else {
3638 table = fib6_new_table(net, cfg->fc_table);
3639 }
3640
3641 if (!table)
3642 goto out;
3643
3644 err = -ENOMEM;
3645 rt = fib6_info_alloc(gfp_flags, !nh);
3646 if (!rt)
3647 goto out;
3648
3649 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3650 extack);
3651 if (IS_ERR(rt->fib6_metrics)) {
3652 err = PTR_ERR(rt->fib6_metrics);
3653
3654 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
3655 goto out;
3656 }
3657
3658 if (cfg->fc_flags & RTF_ADDRCONF)
3659 rt->dst_nocount = true;
3660
3661 if (cfg->fc_flags & RTF_EXPIRES)
3662 fib6_set_expires(rt, jiffies +
3663 clock_t_to_jiffies(cfg->fc_expires));
3664 else
3665 fib6_clean_expires(rt);
3666
3667 if (cfg->fc_protocol == RTPROT_UNSPEC)
3668 cfg->fc_protocol = RTPROT_BOOT;
3669 rt->fib6_protocol = cfg->fc_protocol;
3670
3671 rt->fib6_table = table;
3672 rt->fib6_metric = cfg->fc_metric;
3673 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
3674 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
3675
3676 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3677 rt->fib6_dst.plen = cfg->fc_dst_len;
3678 if (rt->fib6_dst.plen == 128)
3679 rt->dst_host = true;
3680
3681 #ifdef CONFIG_IPV6_SUBTREES
3682 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3683 rt->fib6_src.plen = cfg->fc_src_len;
3684 #endif
3685 if (nh) {
3686 if (!nexthop_get(nh)) {
3687 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
3688 goto out;
3689 }
3690 if (rt->fib6_src.plen) {
3691 NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing");
3692 goto out;
3693 }
3694 rt->nh = nh;
3695 fib6_nh = nexthop_fib6_nh(rt->nh);
3696 } else {
3697 err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack);
3698 if (err)
3699 goto out;
3700
3701 fib6_nh = rt->fib6_nh;
3702
3703
3704
3705
3706 addr_type = ipv6_addr_type(&cfg->fc_dst);
3707 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev,
3708 addr_type))
3709 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3710 }
3711
3712 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
3713 struct net_device *dev = fib6_nh->fib_nh_dev;
3714
3715 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
3716 NL_SET_ERR_MSG(extack, "Invalid source address");
3717 err = -EINVAL;
3718 goto out;
3719 }
3720 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3721 rt->fib6_prefsrc.plen = 128;
3722 } else
3723 rt->fib6_prefsrc.plen = 0;
3724
3725 return rt;
3726 out:
3727 fib6_info_release(rt);
3728 return ERR_PTR(err);
3729 }
3730
3731 int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
3732 struct netlink_ext_ack *extack)
3733 {
3734 struct fib6_info *rt;
3735 int err;
3736
3737 rt = ip6_route_info_create(cfg, gfp_flags, extack);
3738 if (IS_ERR(rt))
3739 return PTR_ERR(rt);
3740
3741 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
3742 fib6_info_release(rt);
3743
3744 return err;
3745 }
3746
3747 static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
3748 {
3749 struct net *net = info->nl_net;
3750 struct fib6_table *table;
3751 int err;
3752
3753 if (rt == net->ipv6.fib6_null_entry) {
3754 err = -ENOENT;
3755 goto out;
3756 }
3757
3758 table = rt->fib6_table;
3759 spin_lock_bh(&table->tb6_lock);
3760 err = fib6_del(rt, info);
3761 spin_unlock_bh(&table->tb6_lock);
3762
3763 out:
3764 fib6_info_release(rt);
3765 return err;
3766 }
3767
3768 int ip6_del_rt(struct net *net, struct fib6_info *rt)
3769 {
3770 struct nl_info info = { .nl_net = net };
3771
3772 return __ip6_del_rt(rt, &info);
3773 }
3774
3775 static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
3776 {
3777 struct nl_info *info = &cfg->fc_nlinfo;
3778 struct net *net = info->nl_net;
3779 struct sk_buff *skb = NULL;
3780 struct fib6_table *table;
3781 int err = -ENOENT;
3782
3783 if (rt == net->ipv6.fib6_null_entry)
3784 goto out_put;
3785 table = rt->fib6_table;
3786 spin_lock_bh(&table->tb6_lock);
3787
3788 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
3789 struct fib6_info *sibling, *next_sibling;
3790
3791
3792 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3793 if (skb) {
3794 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3795
3796 if (rt6_fill_node(net, skb, rt, NULL,
3797 NULL, NULL, 0, RTM_DELROUTE,
3798 info->portid, seq, 0) < 0) {
3799 kfree_skb(skb);
3800 skb = NULL;
3801 } else
3802 info->skip_notify = 1;
3803 }
3804
3805 info->skip_notify_kernel = 1;
3806 call_fib6_multipath_entry_notifiers(net,
3807 FIB_EVENT_ENTRY_DEL,
3808 rt,
3809 rt->fib6_nsiblings,
3810 NULL);
3811 list_for_each_entry_safe(sibling, next_sibling,
3812 &rt->fib6_siblings,
3813 fib6_siblings) {
3814 err = fib6_del(sibling, info);
3815 if (err)
3816 goto out_unlock;
3817 }
3818 }
3819
3820 err = fib6_del(rt, info);
3821 out_unlock:
3822 spin_unlock_bh(&table->tb6_lock);
3823 out_put:
3824 fib6_info_release(rt);
3825
3826 if (skb) {
3827 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3828 info->nlh, gfp_any());
3829 }
3830 return err;
3831 }
3832
3833 static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
3834 {
3835 int rc = -ESRCH;
3836
3837 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3838 goto out;
3839
3840 if (cfg->fc_flags & RTF_GATEWAY &&
3841 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3842 goto out;
3843
3844 rc = rt6_remove_exception_rt(rt);
3845 out:
3846 return rc;
3847 }
3848
3849 static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
3850 struct fib6_nh *nh)
3851 {
3852 struct fib6_result res = {
3853 .f6i = rt,
3854 .nh = nh,
3855 };
3856 struct rt6_info *rt_cache;
3857
3858 rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
3859 if (rt_cache)
3860 return __ip6_del_cached_rt(rt_cache, cfg);
3861
3862 return 0;
3863 }
3864
3865 struct fib6_nh_del_cached_rt_arg {
3866 struct fib6_config *cfg;
3867 struct fib6_info *f6i;
3868 };
3869
3870 static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg)
3871 {
3872 struct fib6_nh_del_cached_rt_arg *arg = _arg;
3873 int rc;
3874
3875 rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh);
3876 return rc != -ESRCH ? rc : 0;
3877 }
3878
3879 static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i)
3880 {
3881 struct fib6_nh_del_cached_rt_arg arg = {
3882 .cfg = cfg,
3883 .f6i = f6i
3884 };
3885
3886 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg);
3887 }
3888
3889 static int ip6_route_del(struct fib6_config *cfg,
3890 struct netlink_ext_ack *extack)
3891 {
3892 struct fib6_table *table;
3893 struct fib6_info *rt;
3894 struct fib6_node *fn;
3895 int err = -ESRCH;
3896
3897 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
3898 if (!table) {
3899 NL_SET_ERR_MSG(extack, "FIB table does not exist");
3900 return err;
3901 }
3902
3903 rcu_read_lock();
3904
3905 fn = fib6_locate(&table->tb6_root,
3906 &cfg->fc_dst, cfg->fc_dst_len,
3907 &cfg->fc_src, cfg->fc_src_len,
3908 !(cfg->fc_flags & RTF_CACHE));
3909
3910 if (fn) {
3911 for_each_fib6_node_rt_rcu(fn) {
3912 struct fib6_nh *nh;
3913
3914 if (rt->nh && cfg->fc_nh_id &&
3915 rt->nh->id != cfg->fc_nh_id)
3916 continue;
3917
3918 if (cfg->fc_flags & RTF_CACHE) {
3919 int rc = 0;
3920
3921 if (rt->nh) {
3922 rc = ip6_del_cached_rt_nh(cfg, rt);
3923 } else if (cfg->fc_nh_id) {
3924 continue;
3925 } else {
3926 nh = rt->fib6_nh;
3927 rc = ip6_del_cached_rt(cfg, rt, nh);
3928 }
3929 if (rc != -ESRCH) {
3930 rcu_read_unlock();
3931 return rc;
3932 }
3933 continue;
3934 }
3935
3936 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
3937 continue;
3938 if (cfg->fc_protocol &&
3939 cfg->fc_protocol != rt->fib6_protocol)
3940 continue;
3941
3942 if (rt->nh) {
3943 if (!fib6_info_hold_safe(rt))
3944 continue;
3945 rcu_read_unlock();
3946
3947 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3948 }
3949 if (cfg->fc_nh_id)
3950 continue;
3951
3952 nh = rt->fib6_nh;
3953 if (cfg->fc_ifindex &&
3954 (!nh->fib_nh_dev ||
3955 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
3956 continue;
3957 if (cfg->fc_flags & RTF_GATEWAY &&
3958 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
3959 continue;
3960 if (!fib6_info_hold_safe(rt))
3961 continue;
3962 rcu_read_unlock();
3963
3964
3965 if (cfg->fc_flags & RTF_GATEWAY)
3966 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3967
3968 return __ip6_del_rt_siblings(rt, cfg);
3969 }
3970 }
3971 rcu_read_unlock();
3972
3973 return err;
3974 }
3975
3976 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
3977 {
3978 struct netevent_redirect netevent;
3979 struct rt6_info *rt, *nrt = NULL;
3980 struct fib6_result res = {};
3981 struct ndisc_options ndopts;
3982 struct inet6_dev *in6_dev;
3983 struct neighbour *neigh;
3984 struct rd_msg *msg;
3985 int optlen, on_link;
3986 u8 *lladdr;
3987
3988 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
3989 optlen -= sizeof(*msg);
3990
3991 if (optlen < 0) {
3992 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
3993 return;
3994 }
3995
3996 msg = (struct rd_msg *)icmp6_hdr(skb);
3997
3998 if (ipv6_addr_is_multicast(&msg->dest)) {
3999 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
4000 return;
4001 }
4002
4003 on_link = 0;
4004 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
4005 on_link = 1;
4006 } else if (ipv6_addr_type(&msg->target) !=
4007 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
4008 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
4009 return;
4010 }
4011
4012 in6_dev = __in6_dev_get(skb->dev);
4013 if (!in6_dev)
4014 return;
4015 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
4016 return;
4017
4018
4019
4020
4021
4022
4023 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
4024 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
4025 return;
4026 }
4027
4028 lladdr = NULL;
4029 if (ndopts.nd_opts_tgt_lladdr) {
4030 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
4031 skb->dev);
4032 if (!lladdr) {
4033 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
4034 return;
4035 }
4036 }
4037
4038 rt = (struct rt6_info *) dst;
4039 if (rt->rt6i_flags & RTF_REJECT) {
4040 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
4041 return;
4042 }
4043
4044
4045
4046
4047
4048 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
4049
4050 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
4051 if (!neigh)
4052 return;
4053
4054
4055
4056
4057
4058 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
4059 NEIGH_UPDATE_F_WEAK_OVERRIDE|
4060 NEIGH_UPDATE_F_OVERRIDE|
4061 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
4062 NEIGH_UPDATE_F_ISROUTER)),
4063 NDISC_REDIRECT, &ndopts);
4064
4065 rcu_read_lock();
4066 res.f6i = rcu_dereference(rt->from);
4067 if (!res.f6i)
4068 goto out;
4069
4070 if (res.f6i->nh) {
4071 struct fib6_nh_match_arg arg = {
4072 .dev = dst->dev,
4073 .gw = &rt->rt6i_gateway,
4074 };
4075
4076 nexthop_for_each_fib6_nh(res.f6i->nh,
4077 fib6_nh_find_match, &arg);
4078
4079
4080
4081
4082 if (!arg.match)
4083 goto out;
4084 res.nh = arg.match;
4085 } else {
4086 res.nh = res.f6i->fib6_nh;
4087 }
4088
4089 res.fib6_flags = res.f6i->fib6_flags;
4090 res.fib6_type = res.f6i->fib6_type;
4091 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
4092 if (!nrt)
4093 goto out;
4094
4095 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
4096 if (on_link)
4097 nrt->rt6i_flags &= ~RTF_GATEWAY;
4098
4099 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
4100
4101
4102 if (rt6_insert_exception(nrt, &res)) {
4103 dst_release_immediate(&nrt->dst);
4104 goto out;
4105 }
4106
4107 netevent.old = &rt->dst;
4108 netevent.new = &nrt->dst;
4109 netevent.daddr = &msg->dest;
4110 netevent.neigh = neigh;
4111 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
4112
4113 out:
4114 rcu_read_unlock();
4115 neigh_release(neigh);
4116 }
4117
4118 #ifdef CONFIG_IPV6_ROUTE_INFO
4119 static struct fib6_info *rt6_get_route_info(struct net *net,
4120 const struct in6_addr *prefix, int prefixlen,
4121 const struct in6_addr *gwaddr,
4122 struct net_device *dev)
4123 {
4124 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4125 int ifindex = dev->ifindex;
4126 struct fib6_node *fn;
4127 struct fib6_info *rt = NULL;
4128 struct fib6_table *table;
4129
4130 table = fib6_get_table(net, tb_id);
4131 if (!table)
4132 return NULL;
4133
4134 rcu_read_lock();
4135 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
4136 if (!fn)
4137 goto out;
4138
4139 for_each_fib6_node_rt_rcu(fn) {
4140
4141 if (rt->nh)
4142 continue;
4143 if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex)
4144 continue;
4145 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
4146 !rt->fib6_nh->fib_nh_gw_family)
4147 continue;
4148 if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr))
4149 continue;
4150 if (!fib6_info_hold_safe(rt))
4151 continue;
4152 break;
4153 }
4154 out:
4155 rcu_read_unlock();
4156 return rt;
4157 }
4158
4159 static struct fib6_info *rt6_add_route_info(struct net *net,
4160 const struct in6_addr *prefix, int prefixlen,
4161 const struct in6_addr *gwaddr,
4162 struct net_device *dev,
4163 unsigned int pref)
4164 {
4165 struct fib6_config cfg = {
4166 .fc_metric = IP6_RT_PRIO_USER,
4167 .fc_ifindex = dev->ifindex,
4168 .fc_dst_len = prefixlen,
4169 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
4170 RTF_UP | RTF_PREF(pref),
4171 .fc_protocol = RTPROT_RA,
4172 .fc_type = RTN_UNICAST,
4173 .fc_nlinfo.portid = 0,
4174 .fc_nlinfo.nlh = NULL,
4175 .fc_nlinfo.nl_net = net,
4176 };
4177
4178 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
4179 cfg.fc_dst = *prefix;
4180 cfg.fc_gateway = *gwaddr;
4181
4182
4183 if (!prefixlen)
4184 cfg.fc_flags |= RTF_DEFAULT;
4185
4186 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
4187
4188 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
4189 }
4190 #endif
4191
4192 struct fib6_info *rt6_get_dflt_router(struct net *net,
4193 const struct in6_addr *addr,
4194 struct net_device *dev)
4195 {
4196 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
4197 struct fib6_info *rt;
4198 struct fib6_table *table;
4199
4200 table = fib6_get_table(net, tb_id);
4201 if (!table)
4202 return NULL;
4203
4204 rcu_read_lock();
4205 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4206 struct fib6_nh *nh;
4207
4208
4209 if (rt->nh)
4210 continue;
4211
4212 nh = rt->fib6_nh;
4213 if (dev == nh->fib_nh_dev &&
4214 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
4215 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
4216 break;
4217 }
4218 if (rt && !fib6_info_hold_safe(rt))
4219 rt = NULL;
4220 rcu_read_unlock();
4221 return rt;
4222 }
4223
4224 struct fib6_info *rt6_add_dflt_router(struct net *net,
4225 const struct in6_addr *gwaddr,
4226 struct net_device *dev,
4227 unsigned int pref)
4228 {
4229 struct fib6_config cfg = {
4230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
4231 .fc_metric = IP6_RT_PRIO_USER,
4232 .fc_ifindex = dev->ifindex,
4233 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
4234 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
4235 .fc_protocol = RTPROT_RA,
4236 .fc_type = RTN_UNICAST,
4237 .fc_nlinfo.portid = 0,
4238 .fc_nlinfo.nlh = NULL,
4239 .fc_nlinfo.nl_net = net,
4240 };
4241
4242 cfg.fc_gateway = *gwaddr;
4243
4244 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
4245 struct fib6_table *table;
4246
4247 table = fib6_get_table(dev_net(dev), cfg.fc_table);
4248 if (table)
4249 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
4250 }
4251
4252 return rt6_get_dflt_router(net, gwaddr, dev);
4253 }
4254
4255 static void __rt6_purge_dflt_routers(struct net *net,
4256 struct fib6_table *table)
4257 {
4258 struct fib6_info *rt;
4259
4260 restart:
4261 rcu_read_lock();
4262 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4263 struct net_device *dev = fib6_info_nh_dev(rt);
4264 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
4265
4266 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
4267 (!idev || idev->cnf.accept_ra != 2) &&
4268 fib6_info_hold_safe(rt)) {
4269 rcu_read_unlock();
4270 ip6_del_rt(net, rt);
4271 goto restart;
4272 }
4273 }
4274 rcu_read_unlock();
4275
4276 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
4277 }
4278
4279 void rt6_purge_dflt_routers(struct net *net)
4280 {
4281 struct fib6_table *table;
4282 struct hlist_head *head;
4283 unsigned int h;
4284
4285 rcu_read_lock();
4286
4287 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
4288 head = &net->ipv6.fib_table_hash[h];
4289 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
4290 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
4291 __rt6_purge_dflt_routers(net, table);
4292 }
4293 }
4294
4295 rcu_read_unlock();
4296 }
4297
4298 static void rtmsg_to_fib6_config(struct net *net,
4299 struct in6_rtmsg *rtmsg,
4300 struct fib6_config *cfg)
4301 {
4302 *cfg = (struct fib6_config){
4303 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
4304 : RT6_TABLE_MAIN,
4305 .fc_ifindex = rtmsg->rtmsg_ifindex,
4306 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
4307 .fc_expires = rtmsg->rtmsg_info,
4308 .fc_dst_len = rtmsg->rtmsg_dst_len,
4309 .fc_src_len = rtmsg->rtmsg_src_len,
4310 .fc_flags = rtmsg->rtmsg_flags,
4311 .fc_type = rtmsg->rtmsg_type,
4312
4313 .fc_nlinfo.nl_net = net,
4314
4315 .fc_dst = rtmsg->rtmsg_dst,
4316 .fc_src = rtmsg->rtmsg_src,
4317 .fc_gateway = rtmsg->rtmsg_gateway,
4318 };
4319 }
4320
4321 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4322 {
4323 struct fib6_config cfg;
4324 struct in6_rtmsg rtmsg;
4325 int err;
4326
4327 switch (cmd) {
4328 case SIOCADDRT:
4329 case SIOCDELRT:
4330 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4331 return -EPERM;
4332 err = copy_from_user(&rtmsg, arg,
4333 sizeof(struct in6_rtmsg));
4334 if (err)
4335 return -EFAULT;
4336
4337 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
4338
4339 rtnl_lock();
4340 switch (cmd) {
4341 case SIOCADDRT:
4342 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
4343 break;
4344 case SIOCDELRT:
4345 err = ip6_route_del(&cfg, NULL);
4346 break;
4347 default:
4348 err = -EINVAL;
4349 }
4350 rtnl_unlock();
4351
4352 return err;
4353 }
4354
4355 return -EINVAL;
4356 }
4357
4358
4359
4360
4361
4362 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
4363 {
4364 struct dst_entry *dst = skb_dst(skb);
4365 struct net *net = dev_net(dst->dev);
4366 struct inet6_dev *idev;
4367 int type;
4368
4369 if (netif_is_l3_master(skb->dev) &&
4370 dst->dev == net->loopback_dev)
4371 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
4372 else
4373 idev = ip6_dst_idev(dst);
4374
4375 switch (ipstats_mib_noroutes) {
4376 case IPSTATS_MIB_INNOROUTES:
4377 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
4378 if (type == IPV6_ADDR_ANY) {
4379 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
4380 break;
4381 }
4382
4383 case IPSTATS_MIB_OUTNOROUTES:
4384 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
4385 break;
4386 }
4387
4388
4389 if (netif_is_l3_master(skb->dev))
4390 skb_dst_drop(skb);
4391
4392 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
4393 kfree_skb(skb);
4394 return 0;
4395 }
4396
4397 static int ip6_pkt_discard(struct sk_buff *skb)
4398 {
4399 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
4400 }
4401
4402 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4403 {
4404 skb->dev = skb_dst(skb)->dev;
4405 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
4406 }
4407
4408 static int ip6_pkt_prohibit(struct sk_buff *skb)
4409 {
4410 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
4411 }
4412
4413 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4414 {
4415 skb->dev = skb_dst(skb)->dev;
4416 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
4417 }
4418
4419
4420
4421
4422
4423 struct fib6_info *addrconf_f6i_alloc(struct net *net,
4424 struct inet6_dev *idev,
4425 const struct in6_addr *addr,
4426 bool anycast, gfp_t gfp_flags)
4427 {
4428 struct fib6_config cfg = {
4429 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
4430 .fc_ifindex = idev->dev->ifindex,
4431 .fc_flags = RTF_UP | RTF_NONEXTHOP,
4432 .fc_dst = *addr,
4433 .fc_dst_len = 128,
4434 .fc_protocol = RTPROT_KERNEL,
4435 .fc_nlinfo.nl_net = net,
4436 .fc_ignore_dev_down = true,
4437 };
4438 struct fib6_info *f6i;
4439
4440 if (anycast) {
4441 cfg.fc_type = RTN_ANYCAST;
4442 cfg.fc_flags |= RTF_ANYCAST;
4443 } else {
4444 cfg.fc_type = RTN_LOCAL;
4445 cfg.fc_flags |= RTF_LOCAL;
4446 }
4447
4448 f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
4449 if (!IS_ERR(f6i))
4450 f6i->dst_nocount = true;
4451 return f6i;
4452 }
4453
4454
4455 struct arg_dev_net_ip {
4456 struct net_device *dev;
4457 struct net *net;
4458 struct in6_addr *addr;
4459 };
4460
4461 static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
4462 {
4463 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
4464 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
4465 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
4466
4467 if (!rt->nh &&
4468 ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) &&
4469 rt != net->ipv6.fib6_null_entry &&
4470 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
4471 spin_lock_bh(&rt6_exception_lock);
4472
4473 rt->fib6_prefsrc.plen = 0;
4474 spin_unlock_bh(&rt6_exception_lock);
4475 }
4476 return 0;
4477 }
4478
4479 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
4480 {
4481 struct net *net = dev_net(ifp->idev->dev);
4482 struct arg_dev_net_ip adni = {
4483 .dev = ifp->idev->dev,
4484 .net = net,
4485 .addr = &ifp->addr,
4486 };
4487 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
4488 }
4489
4490 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
4491
4492
4493 static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
4494 {
4495 struct in6_addr *gateway = (struct in6_addr *)arg;
4496 struct fib6_nh *nh;
4497
4498
4499 if (rt->nh)
4500 return 0;
4501
4502 nh = rt->fib6_nh;
4503 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
4504 nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6))
4505 return -1;
4506
4507
4508
4509
4510
4511 fib6_nh_exceptions_clean_tohost(nh, gateway);
4512
4513 return 0;
4514 }
4515
4516 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
4517 {
4518 fib6_clean_all(net, fib6_clean_tohost, gateway);
4519 }
4520
4521 struct arg_netdev_event {
4522 const struct net_device *dev;
4523 union {
4524 unsigned char nh_flags;
4525 unsigned long event;
4526 };
4527 };
4528
4529 static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
4530 {
4531 struct fib6_info *iter;
4532 struct fib6_node *fn;
4533
4534 fn = rcu_dereference_protected(rt->fib6_node,
4535 lockdep_is_held(&rt->fib6_table->tb6_lock));
4536 iter = rcu_dereference_protected(fn->leaf,
4537 lockdep_is_held(&rt->fib6_table->tb6_lock));
4538 while (iter) {
4539 if (iter->fib6_metric == rt->fib6_metric &&
4540 rt6_qualify_for_ecmp(iter))
4541 return iter;
4542 iter = rcu_dereference_protected(iter->fib6_next,
4543 lockdep_is_held(&rt->fib6_table->tb6_lock));
4544 }
4545
4546 return NULL;
4547 }
4548
4549
4550 static bool rt6_is_dead(const struct fib6_info *rt)
4551 {
4552 if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD ||
4553 (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN &&
4554 ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev)))
4555 return true;
4556
4557 return false;
4558 }
4559
4560 static int rt6_multipath_total_weight(const struct fib6_info *rt)
4561 {
4562 struct fib6_info *iter;
4563 int total = 0;
4564
4565 if (!rt6_is_dead(rt))
4566 total += rt->fib6_nh->fib_nh_weight;
4567
4568 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
4569 if (!rt6_is_dead(iter))
4570 total += iter->fib6_nh->fib_nh_weight;
4571 }
4572
4573 return total;
4574 }
4575
4576 static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
4577 {
4578 int upper_bound = -1;
4579
4580 if (!rt6_is_dead(rt)) {
4581 *weight += rt->fib6_nh->fib_nh_weight;
4582 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
4583 total) - 1;
4584 }
4585 atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound);
4586 }
4587
4588 static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
4589 {
4590 struct fib6_info *iter;
4591 int weight = 0;
4592
4593 rt6_upper_bound_set(rt, &weight, total);
4594
4595 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4596 rt6_upper_bound_set(iter, &weight, total);
4597 }
4598
4599 void rt6_multipath_rebalance(struct fib6_info *rt)
4600 {
4601 struct fib6_info *first;
4602 int total;
4603
4604
4605
4606
4607
4608 if (!rt->fib6_nsiblings || rt->should_flush)
4609 return;
4610
4611
4612
4613
4614
4615 first = rt6_multipath_first_sibling(rt);
4616 if (WARN_ON_ONCE(!first))
4617 return;
4618
4619 total = rt6_multipath_total_weight(first);
4620 rt6_multipath_upper_bound_set(first, total);
4621 }
4622
4623 static int fib6_ifup(struct fib6_info *rt, void *p_arg)
4624 {
4625 const struct arg_netdev_event *arg = p_arg;
4626 struct net *net = dev_net(arg->dev);
4627
4628 if (rt != net->ipv6.fib6_null_entry && !rt->nh &&
4629 rt->fib6_nh->fib_nh_dev == arg->dev) {
4630 rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags;
4631 fib6_update_sernum_upto_root(net, rt);
4632 rt6_multipath_rebalance(rt);
4633 }
4634
4635 return 0;
4636 }
4637
4638 void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
4639 {
4640 struct arg_netdev_event arg = {
4641 .dev = dev,
4642 {
4643 .nh_flags = nh_flags,
4644 },
4645 };
4646
4647 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4648 arg.nh_flags |= RTNH_F_LINKDOWN;
4649
4650 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4651 }
4652
4653
4654 static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
4655 const struct net_device *dev)
4656 {
4657 struct fib6_info *iter;
4658
4659 if (rt->fib6_nh->fib_nh_dev == dev)
4660 return true;
4661 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4662 if (iter->fib6_nh->fib_nh_dev == dev)
4663 return true;
4664
4665 return false;
4666 }
4667
4668 static void rt6_multipath_flush(struct fib6_info *rt)
4669 {
4670 struct fib6_info *iter;
4671
4672 rt->should_flush = 1;
4673 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4674 iter->should_flush = 1;
4675 }
4676
4677 static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
4678 const struct net_device *down_dev)
4679 {
4680 struct fib6_info *iter;
4681 unsigned int dead = 0;
4682
4683 if (rt->fib6_nh->fib_nh_dev == down_dev ||
4684 rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4685 dead++;
4686 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4687 if (iter->fib6_nh->fib_nh_dev == down_dev ||
4688 iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4689 dead++;
4690
4691 return dead;
4692 }
4693
4694 static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
4695 const struct net_device *dev,
4696 unsigned char nh_flags)
4697 {
4698 struct fib6_info *iter;
4699
4700 if (rt->fib6_nh->fib_nh_dev == dev)
4701 rt->fib6_nh->fib_nh_flags |= nh_flags;
4702 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4703 if (iter->fib6_nh->fib_nh_dev == dev)
4704 iter->fib6_nh->fib_nh_flags |= nh_flags;
4705 }
4706
4707
4708 static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
4709 {
4710 const struct arg_netdev_event *arg = p_arg;
4711 const struct net_device *dev = arg->dev;
4712 struct net *net = dev_net(dev);
4713
4714 if (rt == net->ipv6.fib6_null_entry || rt->nh)
4715 return 0;
4716
4717 switch (arg->event) {
4718 case NETDEV_UNREGISTER:
4719 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4720 case NETDEV_DOWN:
4721 if (rt->should_flush)
4722 return -1;
4723 if (!rt->fib6_nsiblings)
4724 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4725 if (rt6_multipath_uses_dev(rt, dev)) {
4726 unsigned int count;
4727
4728 count = rt6_multipath_dead_count(rt, dev);
4729 if (rt->fib6_nsiblings + 1 == count) {
4730 rt6_multipath_flush(rt);
4731 return -1;
4732 }
4733 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4734 RTNH_F_LINKDOWN);
4735 fib6_update_sernum(net, rt);
4736 rt6_multipath_rebalance(rt);
4737 }
4738 return -2;
4739 case NETDEV_CHANGE:
4740 if (rt->fib6_nh->fib_nh_dev != dev ||
4741 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
4742 break;
4743 rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
4744 rt6_multipath_rebalance(rt);
4745 break;
4746 }
4747
4748 return 0;
4749 }
4750
4751 void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
4752 {
4753 struct arg_netdev_event arg = {
4754 .dev = dev,
4755 {
4756 .event = event,
4757 },
4758 };
4759 struct net *net = dev_net(dev);
4760
4761 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4762 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4763 else
4764 fib6_clean_all(net, fib6_ifdown, &arg);
4765 }
4766
4767 void rt6_disable_ip(struct net_device *dev, unsigned long event)
4768 {
4769 rt6_sync_down_dev(dev, event);
4770 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4771 neigh_ifdown(&nd_tbl, dev);
4772 }
4773
4774 struct rt6_mtu_change_arg {
4775 struct net_device *dev;
4776 unsigned int mtu;
4777 struct fib6_info *f6i;
4778 };
4779
4780 static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg)
4781 {
4782 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg;
4783 struct fib6_info *f6i = arg->f6i;
4784
4785
4786
4787
4788
4789
4790 if (nh->fib_nh_dev == arg->dev) {
4791 struct inet6_dev *idev = __in6_dev_get(arg->dev);
4792 u32 mtu = f6i->fib6_pmtu;
4793
4794 if (mtu >= arg->mtu ||
4795 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4796 fib6_metric_set(f6i, RTAX_MTU, arg->mtu);
4797
4798 spin_lock_bh(&rt6_exception_lock);
4799 rt6_exceptions_update_pmtu(idev, nh, arg->mtu);
4800 spin_unlock_bh(&rt6_exception_lock);
4801 }
4802
4803 return 0;
4804 }
4805
4806 static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
4807 {
4808 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4809 struct inet6_dev *idev;
4810
4811
4812
4813
4814
4815
4816
4817 idev = __in6_dev_get(arg->dev);
4818 if (!idev)
4819 return 0;
4820
4821 if (fib6_metric_locked(f6i, RTAX_MTU))
4822 return 0;
4823
4824 arg->f6i = f6i;
4825 if (f6i->nh) {
4826
4827 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change,
4828 arg);
4829 }
4830
4831 return fib6_nh_mtu_change(f6i->fib6_nh, arg);
4832 }
4833
4834 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
4835 {
4836 struct rt6_mtu_change_arg arg = {
4837 .dev = dev,
4838 .mtu = mtu,
4839 };
4840
4841 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
4842 }
4843
4844 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
4845 [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
4846 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
4847 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
4848 [RTA_OIF] = { .type = NLA_U32 },
4849 [RTA_IIF] = { .type = NLA_U32 },
4850 [RTA_PRIORITY] = { .type = NLA_U32 },
4851 [RTA_METRICS] = { .type = NLA_NESTED },
4852 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
4853 [RTA_PREF] = { .type = NLA_U8 },
4854 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4855 [RTA_ENCAP] = { .type = NLA_NESTED },
4856 [RTA_EXPIRES] = { .type = NLA_U32 },
4857 [RTA_UID] = { .type = NLA_U32 },
4858 [RTA_MARK] = { .type = NLA_U32 },
4859 [RTA_TABLE] = { .type = NLA_U32 },
4860 [RTA_IP_PROTO] = { .type = NLA_U8 },
4861 [RTA_SPORT] = { .type = NLA_U16 },
4862 [RTA_DPORT] = { .type = NLA_U16 },
4863 [RTA_NH_ID] = { .type = NLA_U32 },
4864 };
4865
4866 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
4867 struct fib6_config *cfg,
4868 struct netlink_ext_ack *extack)
4869 {
4870 struct rtmsg *rtm;
4871 struct nlattr *tb[RTA_MAX+1];
4872 unsigned int pref;
4873 int err;
4874
4875 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
4876 rtm_ipv6_policy, extack);
4877 if (err < 0)
4878 goto errout;
4879
4880 err = -EINVAL;
4881 rtm = nlmsg_data(nlh);
4882
4883 *cfg = (struct fib6_config){
4884 .fc_table = rtm->rtm_table,
4885 .fc_dst_len = rtm->rtm_dst_len,
4886 .fc_src_len = rtm->rtm_src_len,
4887 .fc_flags = RTF_UP,
4888 .fc_protocol = rtm->rtm_protocol,
4889 .fc_type = rtm->rtm_type,
4890
4891 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
4892 .fc_nlinfo.nlh = nlh,
4893 .fc_nlinfo.nl_net = sock_net(skb->sk),
4894 };
4895
4896 if (rtm->rtm_type == RTN_UNREACHABLE ||
4897 rtm->rtm_type == RTN_BLACKHOLE ||
4898 rtm->rtm_type == RTN_PROHIBIT ||
4899 rtm->rtm_type == RTN_THROW)
4900 cfg->fc_flags |= RTF_REJECT;
4901
4902 if (rtm->rtm_type == RTN_LOCAL)
4903 cfg->fc_flags |= RTF_LOCAL;
4904
4905 if (rtm->rtm_flags & RTM_F_CLONED)
4906 cfg->fc_flags |= RTF_CACHE;
4907
4908 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
4909
4910 if (tb[RTA_NH_ID]) {
4911 if (tb[RTA_GATEWAY] || tb[RTA_OIF] ||
4912 tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) {
4913 NL_SET_ERR_MSG(extack,
4914 "Nexthop specification and nexthop id are mutually exclusive");
4915 goto errout;
4916 }
4917 cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]);
4918 }
4919
4920 if (tb[RTA_GATEWAY]) {
4921 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
4922 cfg->fc_flags |= RTF_GATEWAY;
4923 }
4924 if (tb[RTA_VIA]) {
4925 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
4926 goto errout;
4927 }
4928
4929 if (tb[RTA_DST]) {
4930 int plen = (rtm->rtm_dst_len + 7) >> 3;
4931
4932 if (nla_len(tb[RTA_DST]) < plen)
4933 goto errout;
4934
4935 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
4936 }
4937
4938 if (tb[RTA_SRC]) {
4939 int plen = (rtm->rtm_src_len + 7) >> 3;
4940
4941 if (nla_len(tb[RTA_SRC]) < plen)
4942 goto errout;
4943
4944 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
4945 }
4946
4947 if (tb[RTA_PREFSRC])
4948 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
4949
4950 if (tb[RTA_OIF])
4951 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
4952
4953 if (tb[RTA_PRIORITY])
4954 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
4955
4956 if (tb[RTA_METRICS]) {
4957 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
4958 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
4959 }
4960
4961 if (tb[RTA_TABLE])
4962 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
4963
4964 if (tb[RTA_MULTIPATH]) {
4965 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
4966 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
4967
4968 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
4969 cfg->fc_mp_len, extack);
4970 if (err < 0)
4971 goto errout;
4972 }
4973
4974 if (tb[RTA_PREF]) {
4975 pref = nla_get_u8(tb[RTA_PREF]);
4976 if (pref != ICMPV6_ROUTER_PREF_LOW &&
4977 pref != ICMPV6_ROUTER_PREF_HIGH)
4978 pref = ICMPV6_ROUTER_PREF_MEDIUM;
4979 cfg->fc_flags |= RTF_PREF(pref);
4980 }
4981
4982 if (tb[RTA_ENCAP])
4983 cfg->fc_encap = tb[RTA_ENCAP];
4984
4985 if (tb[RTA_ENCAP_TYPE]) {
4986 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
4987
4988 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
4989 if (err < 0)
4990 goto errout;
4991 }
4992
4993 if (tb[RTA_EXPIRES]) {
4994 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
4995
4996 if (addrconf_finite_timeout(timeout)) {
4997 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
4998 cfg->fc_flags |= RTF_EXPIRES;
4999 }
5000 }
5001
5002 err = 0;
5003 errout:
5004 return err;
5005 }
5006
5007 struct rt6_nh {
5008 struct fib6_info *fib6_info;
5009 struct fib6_config r_cfg;
5010 struct list_head next;
5011 };
5012
5013 static int ip6_route_info_append(struct net *net,
5014 struct list_head *rt6_nh_list,
5015 struct fib6_info *rt,
5016 struct fib6_config *r_cfg)
5017 {
5018 struct rt6_nh *nh;
5019 int err = -EEXIST;
5020
5021 list_for_each_entry(nh, rt6_nh_list, next) {
5022
5023 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
5024 return err;
5025 }
5026
5027 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
5028 if (!nh)
5029 return -ENOMEM;
5030 nh->fib6_info = rt;
5031 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
5032 list_add_tail(&nh->next, rt6_nh_list);
5033
5034 return 0;
5035 }
5036
5037 static void ip6_route_mpath_notify(struct fib6_info *rt,
5038 struct fib6_info *rt_last,
5039 struct nl_info *info,
5040 __u16 nlflags)
5041 {
5042
5043
5044
5045
5046
5047
5048 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
5049 rt = list_first_entry(&rt_last->fib6_siblings,
5050 struct fib6_info,
5051 fib6_siblings);
5052 }
5053
5054 if (rt)
5055 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
5056 }
5057
5058 static int ip6_route_multipath_add(struct fib6_config *cfg,
5059 struct netlink_ext_ack *extack)
5060 {
5061 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
5062 struct nl_info *info = &cfg->fc_nlinfo;
5063 enum fib_event_type event_type;
5064 struct fib6_config r_cfg;
5065 struct rtnexthop *rtnh;
5066 struct fib6_info *rt;
5067 struct rt6_nh *err_nh;
5068 struct rt6_nh *nh, *nh_safe;
5069 __u16 nlflags;
5070 int remaining;
5071 int attrlen;
5072 int err = 1;
5073 int nhn = 0;
5074 int replace = (cfg->fc_nlinfo.nlh &&
5075 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
5076 LIST_HEAD(rt6_nh_list);
5077
5078 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
5079 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
5080 nlflags |= NLM_F_APPEND;
5081
5082 remaining = cfg->fc_mp_len;
5083 rtnh = (struct rtnexthop *)cfg->fc_mp;
5084
5085
5086
5087
5088 while (rtnh_ok(rtnh, remaining)) {
5089 memcpy(&r_cfg, cfg, sizeof(*cfg));
5090 if (rtnh->rtnh_ifindex)
5091 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5092
5093 attrlen = rtnh_attrlen(rtnh);
5094 if (attrlen > 0) {
5095 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5096
5097 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5098 if (nla) {
5099 r_cfg.fc_gateway = nla_get_in6_addr(nla);
5100 r_cfg.fc_flags |= RTF_GATEWAY;
5101 }
5102 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
5103 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
5104 if (nla)
5105 r_cfg.fc_encap_type = nla_get_u16(nla);
5106 }
5107
5108 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
5109 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
5110 if (IS_ERR(rt)) {
5111 err = PTR_ERR(rt);
5112 rt = NULL;
5113 goto cleanup;
5114 }
5115 if (!rt6_qualify_for_ecmp(rt)) {
5116 err = -EINVAL;
5117 NL_SET_ERR_MSG(extack,
5118 "Device only routes can not be added for IPv6 using the multipath API.");
5119 fib6_info_release(rt);
5120 goto cleanup;
5121 }
5122
5123 rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1;
5124
5125 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
5126 rt, &r_cfg);
5127 if (err) {
5128 fib6_info_release(rt);
5129 goto cleanup;
5130 }
5131
5132 rtnh = rtnh_next(rtnh, &remaining);
5133 }
5134
5135 if (list_empty(&rt6_nh_list)) {
5136 NL_SET_ERR_MSG(extack,
5137 "Invalid nexthop configuration - no valid nexthops");
5138 return -EINVAL;
5139 }
5140
5141
5142
5143
5144
5145 info->skip_notify = 1;
5146
5147
5148
5149
5150 info->skip_notify_kernel = 1;
5151
5152 err_nh = NULL;
5153 list_for_each_entry(nh, &rt6_nh_list, next) {
5154 err = __ip6_ins_rt(nh->fib6_info, info, extack);
5155 fib6_info_release(nh->fib6_info);
5156
5157 if (!err) {
5158
5159 rt_last = nh->fib6_info;
5160
5161
5162 if (!rt_notif)
5163 rt_notif = nh->fib6_info;
5164 }
5165
5166
5167 nh->fib6_info = NULL;
5168 if (err) {
5169 if (replace && nhn)
5170 NL_SET_ERR_MSG_MOD(extack,
5171 "multipath route replace failed (check consistency of installed routes)");
5172 err_nh = nh;
5173 goto add_errout;
5174 }
5175
5176
5177
5178
5179
5180
5181
5182
5183 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
5184 NLM_F_REPLACE);
5185 cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
5186 nhn++;
5187 }
5188
5189 event_type = replace ? FIB_EVENT_ENTRY_REPLACE : FIB_EVENT_ENTRY_ADD;
5190 err = call_fib6_multipath_entry_notifiers(info->nl_net, event_type,
5191 rt_notif, nhn - 1, extack);
5192 if (err) {
5193
5194 err_nh = NULL;
5195 goto add_errout;
5196 }
5197
5198
5199 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5200 goto cleanup;
5201
5202 add_errout:
5203
5204
5205
5206
5207 if (rt_notif)
5208 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5209
5210
5211 list_for_each_entry(nh, &rt6_nh_list, next) {
5212 if (err_nh == nh)
5213 break;
5214 ip6_route_del(&nh->r_cfg, extack);
5215 }
5216
5217 cleanup:
5218 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
5219 if (nh->fib6_info)
5220 fib6_info_release(nh->fib6_info);
5221 list_del(&nh->next);
5222 kfree(nh);
5223 }
5224
5225 return err;
5226 }
5227
5228 static int ip6_route_multipath_del(struct fib6_config *cfg,
5229 struct netlink_ext_ack *extack)
5230 {
5231 struct fib6_config r_cfg;
5232 struct rtnexthop *rtnh;
5233 int remaining;
5234 int attrlen;
5235 int err = 1, last_err = 0;
5236
5237 remaining = cfg->fc_mp_len;
5238 rtnh = (struct rtnexthop *)cfg->fc_mp;
5239
5240
5241 while (rtnh_ok(rtnh, remaining)) {
5242 memcpy(&r_cfg, cfg, sizeof(*cfg));
5243 if (rtnh->rtnh_ifindex)
5244 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5245
5246 attrlen = rtnh_attrlen(rtnh);
5247 if (attrlen > 0) {
5248 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5249
5250 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5251 if (nla) {
5252 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
5253 r_cfg.fc_flags |= RTF_GATEWAY;
5254 }
5255 }
5256 err = ip6_route_del(&r_cfg, extack);
5257 if (err)
5258 last_err = err;
5259
5260 rtnh = rtnh_next(rtnh, &remaining);
5261 }
5262
5263 return last_err;
5264 }
5265
5266 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5267 struct netlink_ext_ack *extack)
5268 {
5269 struct fib6_config cfg;
5270 int err;
5271
5272 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5273 if (err < 0)
5274 return err;
5275
5276 if (cfg.fc_nh_id &&
5277 !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) {
5278 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
5279 return -EINVAL;
5280 }
5281
5282 if (cfg.fc_mp)
5283 return ip6_route_multipath_del(&cfg, extack);
5284 else {
5285 cfg.fc_delete_all_nh = 1;
5286 return ip6_route_del(&cfg, extack);
5287 }
5288 }
5289
5290 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5291 struct netlink_ext_ack *extack)
5292 {
5293 struct fib6_config cfg;
5294 int err;
5295
5296 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5297 if (err < 0)
5298 return err;
5299
5300 if (cfg.fc_metric == 0)
5301 cfg.fc_metric = IP6_RT_PRIO_USER;
5302
5303 if (cfg.fc_mp)
5304 return ip6_route_multipath_add(&cfg, extack);
5305 else
5306 return ip6_route_add(&cfg, GFP_KERNEL, extack);
5307 }
5308
5309
5310 static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg)
5311 {
5312 int *nexthop_len = arg;
5313
5314 *nexthop_len += nla_total_size(0)
5315 + NLA_ALIGN(sizeof(struct rtnexthop))
5316 + nla_total_size(16);
5317
5318 if (nh->fib_nh_lws) {
5319
5320 *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5321
5322 *nexthop_len += nla_total_size(2);
5323 }
5324
5325 return 0;
5326 }
5327
5328 static size_t rt6_nlmsg_size(struct fib6_info *f6i)
5329 {
5330 int nexthop_len;
5331
5332 if (f6i->nh) {
5333 nexthop_len = nla_total_size(4);
5334 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size,
5335 &nexthop_len);
5336 } else {
5337 struct fib6_nh *nh = f6i->fib6_nh;
5338
5339 nexthop_len = 0;
5340 if (f6i->fib6_nsiblings) {
5341 nexthop_len = nla_total_size(0)
5342 + NLA_ALIGN(sizeof(struct rtnexthop))
5343 + nla_total_size(16)
5344 + lwtunnel_get_encap_size(nh->fib_nh_lws);
5345
5346 nexthop_len *= f6i->fib6_nsiblings;
5347 }
5348 nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5349 }
5350
5351 return NLMSG_ALIGN(sizeof(struct rtmsg))
5352 + nla_total_size(16)
5353 + nla_total_size(16)
5354 + nla_total_size(16)
5355 + nla_total_size(16)
5356 + nla_total_size(4)
5357 + nla_total_size(4)
5358 + nla_total_size(4)
5359 + nla_total_size(4)
5360 + RTAX_MAX * nla_total_size(4)
5361 + nla_total_size(sizeof(struct rta_cacheinfo))
5362 + nla_total_size(TCP_CA_NAME_MAX)
5363 + nla_total_size(1)
5364 + nexthop_len;
5365 }
5366
5367 static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh,
5368 unsigned char *flags)
5369 {
5370 if (nexthop_is_multipath(nh)) {
5371 struct nlattr *mp;
5372
5373 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5374 if (!mp)
5375 goto nla_put_failure;
5376
5377 if (nexthop_mpath_fill_node(skb, nh, AF_INET6))
5378 goto nla_put_failure;
5379
5380 nla_nest_end(skb, mp);
5381 } else {
5382 struct fib6_nh *fib6_nh;
5383
5384 fib6_nh = nexthop_fib6_nh(nh);
5385 if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6,
5386 flags, false) < 0)
5387 goto nla_put_failure;
5388 }
5389
5390 return 0;
5391
5392 nla_put_failure:
5393 return -EMSGSIZE;
5394 }
5395
5396 static int rt6_fill_node(struct net *net, struct sk_buff *skb,
5397 struct fib6_info *rt, struct dst_entry *dst,
5398 struct in6_addr *dest, struct in6_addr *src,
5399 int iif, int type, u32 portid, u32 seq,
5400 unsigned int flags)
5401 {
5402 struct rt6_info *rt6 = (struct rt6_info *)dst;
5403 struct rt6key *rt6_dst, *rt6_src;
5404 u32 *pmetrics, table, rt6_flags;
5405 unsigned char nh_flags = 0;
5406 struct nlmsghdr *nlh;
5407 struct rtmsg *rtm;
5408 long expires = 0;
5409
5410 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
5411 if (!nlh)
5412 return -EMSGSIZE;
5413
5414 if (rt6) {
5415 rt6_dst = &rt6->rt6i_dst;
5416 rt6_src = &rt6->rt6i_src;
5417 rt6_flags = rt6->rt6i_flags;
5418 } else {
5419 rt6_dst = &rt->fib6_dst;
5420 rt6_src = &rt->fib6_src;
5421 rt6_flags = rt->fib6_flags;
5422 }
5423
5424 rtm = nlmsg_data(nlh);
5425 rtm->rtm_family = AF_INET6;
5426 rtm->rtm_dst_len = rt6_dst->plen;
5427 rtm->rtm_src_len = rt6_src->plen;
5428 rtm->rtm_tos = 0;
5429 if (rt->fib6_table)
5430 table = rt->fib6_table->tb6_id;
5431 else
5432 table = RT6_TABLE_UNSPEC;
5433 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
5434 if (nla_put_u32(skb, RTA_TABLE, table))
5435 goto nla_put_failure;
5436
5437 rtm->rtm_type = rt->fib6_type;
5438 rtm->rtm_flags = 0;
5439 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
5440 rtm->rtm_protocol = rt->fib6_protocol;
5441
5442 if (rt6_flags & RTF_CACHE)
5443 rtm->rtm_flags |= RTM_F_CLONED;
5444
5445 if (dest) {
5446 if (nla_put_in6_addr(skb, RTA_DST, dest))
5447 goto nla_put_failure;
5448 rtm->rtm_dst_len = 128;
5449 } else if (rtm->rtm_dst_len)
5450 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
5451 goto nla_put_failure;
5452 #ifdef CONFIG_IPV6_SUBTREES
5453 if (src) {
5454 if (nla_put_in6_addr(skb, RTA_SRC, src))
5455 goto nla_put_failure;
5456 rtm->rtm_src_len = 128;
5457 } else if (rtm->rtm_src_len &&
5458 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
5459 goto nla_put_failure;
5460 #endif
5461 if (iif) {
5462 #ifdef CONFIG_IPV6_MROUTE
5463 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
5464 int err = ip6mr_get_route(net, skb, rtm, portid);
5465
5466 if (err == 0)
5467 return 0;
5468 if (err < 0)
5469 goto nla_put_failure;
5470 } else
5471 #endif
5472 if (nla_put_u32(skb, RTA_IIF, iif))
5473 goto nla_put_failure;
5474 } else if (dest) {
5475 struct in6_addr saddr_buf;
5476 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
5477 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5478 goto nla_put_failure;
5479 }
5480
5481 if (rt->fib6_prefsrc.plen) {
5482 struct in6_addr saddr_buf;
5483 saddr_buf = rt->fib6_prefsrc.addr;
5484 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5485 goto nla_put_failure;
5486 }
5487
5488 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
5489 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
5490 goto nla_put_failure;
5491
5492 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
5493 goto nla_put_failure;
5494
5495
5496
5497
5498 if (rt6) {
5499 if (rt6_flags & RTF_GATEWAY &&
5500 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
5501 goto nla_put_failure;
5502
5503 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
5504 goto nla_put_failure;
5505 } else if (rt->fib6_nsiblings) {
5506 struct fib6_info *sibling, *next_sibling;
5507 struct nlattr *mp;
5508
5509 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5510 if (!mp)
5511 goto nla_put_failure;
5512
5513 if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common,
5514 rt->fib6_nh->fib_nh_weight, AF_INET6) < 0)
5515 goto nla_put_failure;
5516
5517 list_for_each_entry_safe(sibling, next_sibling,
5518 &rt->fib6_siblings, fib6_siblings) {
5519 if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common,
5520 sibling->fib6_nh->fib_nh_weight,
5521 AF_INET6) < 0)
5522 goto nla_put_failure;
5523 }
5524
5525 nla_nest_end(skb, mp);
5526 } else if (rt->nh) {
5527 if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id))
5528 goto nla_put_failure;
5529
5530 if (nexthop_is_blackhole(rt->nh))
5531 rtm->rtm_type = RTN_BLACKHOLE;
5532
5533 if (rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
5534 goto nla_put_failure;
5535
5536 rtm->rtm_flags |= nh_flags;
5537 } else {
5538 if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6,
5539 &nh_flags, false) < 0)
5540 goto nla_put_failure;
5541
5542 rtm->rtm_flags |= nh_flags;
5543 }
5544
5545 if (rt6_flags & RTF_EXPIRES) {
5546 expires = dst ? dst->expires : rt->expires;
5547 expires -= jiffies;
5548 }
5549
5550 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
5551 goto nla_put_failure;
5552
5553 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
5554 goto nla_put_failure;
5555
5556
5557 nlmsg_end(skb, nlh);
5558 return 0;
5559
5560 nla_put_failure:
5561 nlmsg_cancel(skb, nlh);
5562 return -EMSGSIZE;
5563 }
5564
5565 static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
5566 {
5567 const struct net_device *dev = arg;
5568
5569 if (nh->fib_nh_dev == dev)
5570 return 1;
5571
5572 return 0;
5573 }
5574
5575 static bool fib6_info_uses_dev(const struct fib6_info *f6i,
5576 const struct net_device *dev)
5577 {
5578 if (f6i->nh) {
5579 struct net_device *_dev = (struct net_device *)dev;
5580
5581 return !!nexthop_for_each_fib6_nh(f6i->nh,
5582 fib6_info_nh_uses_dev,
5583 _dev);
5584 }
5585
5586 if (f6i->fib6_nh->fib_nh_dev == dev)
5587 return true;
5588
5589 if (f6i->fib6_nsiblings) {
5590 struct fib6_info *sibling, *next_sibling;
5591
5592 list_for_each_entry_safe(sibling, next_sibling,
5593 &f6i->fib6_siblings, fib6_siblings) {
5594 if (sibling->fib6_nh->fib_nh_dev == dev)
5595 return true;
5596 }
5597 }
5598
5599 return false;
5600 }
5601
5602 struct fib6_nh_exception_dump_walker {
5603 struct rt6_rtnl_dump_arg *dump;
5604 struct fib6_info *rt;
5605 unsigned int flags;
5606 unsigned int skip;
5607 unsigned int count;
5608 };
5609
5610 static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
5611 {
5612 struct fib6_nh_exception_dump_walker *w = arg;
5613 struct rt6_rtnl_dump_arg *dump = w->dump;
5614 struct rt6_exception_bucket *bucket;
5615 struct rt6_exception *rt6_ex;
5616 int i, err;
5617
5618 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
5619 if (!bucket)
5620 return 0;
5621
5622 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
5623 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
5624 if (w->skip) {
5625 w->skip--;
5626 continue;
5627 }
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640 if (rt6_check_expired(rt6_ex->rt6i)) {
5641 w->count++;
5642 continue;
5643 }
5644
5645 err = rt6_fill_node(dump->net, dump->skb, w->rt,
5646 &rt6_ex->rt6i->dst, NULL, NULL, 0,
5647 RTM_NEWROUTE,
5648 NETLINK_CB(dump->cb->skb).portid,
5649 dump->cb->nlh->nlmsg_seq, w->flags);
5650 if (err)
5651 return err;
5652
5653 w->count++;
5654 }
5655 bucket++;
5656 }
5657
5658 return 0;
5659 }
5660
5661
5662 int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
5663 {
5664 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
5665 struct fib_dump_filter *filter = &arg->filter;
5666 unsigned int flags = NLM_F_MULTI;
5667 struct net *net = arg->net;
5668 int count = 0;
5669
5670 if (rt == net->ipv6.fib6_null_entry)
5671 return -1;
5672
5673 if ((filter->flags & RTM_F_PREFIX) &&
5674 !(rt->fib6_flags & RTF_PREFIX_RT)) {
5675
5676 return -1;
5677 }
5678 if (filter->filter_set &&
5679 ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
5680 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
5681 (filter->protocol && rt->fib6_protocol != filter->protocol))) {
5682 return -1;
5683 }
5684
5685 if (filter->filter_set ||
5686 !filter->dump_routes || !filter->dump_exceptions) {
5687 flags |= NLM_F_DUMP_FILTERED;
5688 }
5689
5690 if (filter->dump_routes) {
5691 if (skip) {
5692 skip--;
5693 } else {
5694 if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
5695 0, RTM_NEWROUTE,
5696 NETLINK_CB(arg->cb->skb).portid,
5697 arg->cb->nlh->nlmsg_seq, flags)) {
5698 return 0;
5699 }
5700 count++;
5701 }
5702 }
5703
5704 if (filter->dump_exceptions) {
5705 struct fib6_nh_exception_dump_walker w = { .dump = arg,
5706 .rt = rt,
5707 .flags = flags,
5708 .skip = skip,
5709 .count = 0 };
5710 int err;
5711
5712 rcu_read_lock();
5713 if (rt->nh) {
5714 err = nexthop_for_each_fib6_nh(rt->nh,
5715 rt6_nh_dump_exceptions,
5716 &w);
5717 } else {
5718 err = rt6_nh_dump_exceptions(rt->fib6_nh, &w);
5719 }
5720 rcu_read_unlock();
5721
5722 if (err)
5723 return count += w.count;
5724 }
5725
5726 return -1;
5727 }
5728
5729 static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
5730 const struct nlmsghdr *nlh,
5731 struct nlattr **tb,
5732 struct netlink_ext_ack *extack)
5733 {
5734 struct rtmsg *rtm;
5735 int i, err;
5736
5737 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
5738 NL_SET_ERR_MSG_MOD(extack,
5739 "Invalid header for get route request");
5740 return -EINVAL;
5741 }
5742
5743 if (!netlink_strict_get_check(skb))
5744 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5745 rtm_ipv6_policy, extack);
5746
5747 rtm = nlmsg_data(nlh);
5748 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
5749 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
5750 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
5751 rtm->rtm_type) {
5752 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
5753 return -EINVAL;
5754 }
5755 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
5756 NL_SET_ERR_MSG_MOD(extack,
5757 "Invalid flags for get route request");
5758 return -EINVAL;
5759 }
5760
5761 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
5762 rtm_ipv6_policy, extack);
5763 if (err)
5764 return err;
5765
5766 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
5767 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
5768 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
5769 return -EINVAL;
5770 }
5771
5772 for (i = 0; i <= RTA_MAX; i++) {
5773 if (!tb[i])
5774 continue;
5775
5776 switch (i) {
5777 case RTA_SRC:
5778 case RTA_DST:
5779 case RTA_IIF:
5780 case RTA_OIF:
5781 case RTA_MARK:
5782 case RTA_UID:
5783 case RTA_SPORT:
5784 case RTA_DPORT:
5785 case RTA_IP_PROTO:
5786 break;
5787 default:
5788 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
5789 return -EINVAL;
5790 }
5791 }
5792
5793 return 0;
5794 }
5795
5796 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5797 struct netlink_ext_ack *extack)
5798 {
5799 struct net *net = sock_net(in_skb->sk);
5800 struct nlattr *tb[RTA_MAX+1];
5801 int err, iif = 0, oif = 0;
5802 struct fib6_info *from;
5803 struct dst_entry *dst;
5804 struct rt6_info *rt;
5805 struct sk_buff *skb;
5806 struct rtmsg *rtm;
5807 struct flowi6 fl6 = {};
5808 bool fibmatch;
5809
5810 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
5811 if (err < 0)
5812 goto errout;
5813
5814 err = -EINVAL;
5815 rtm = nlmsg_data(nlh);
5816 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
5817 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
5818
5819 if (tb[RTA_SRC]) {
5820 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
5821 goto errout;
5822
5823 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
5824 }
5825
5826 if (tb[RTA_DST]) {
5827 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
5828 goto errout;
5829
5830 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
5831 }
5832
5833 if (tb[RTA_IIF])
5834 iif = nla_get_u32(tb[RTA_IIF]);
5835
5836 if (tb[RTA_OIF])
5837 oif = nla_get_u32(tb[RTA_OIF]);
5838
5839 if (tb[RTA_MARK])
5840 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
5841
5842 if (tb[RTA_UID])
5843 fl6.flowi6_uid = make_kuid(current_user_ns(),
5844 nla_get_u32(tb[RTA_UID]));
5845 else
5846 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
5847
5848 if (tb[RTA_SPORT])
5849 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
5850
5851 if (tb[RTA_DPORT])
5852 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
5853
5854 if (tb[RTA_IP_PROTO]) {
5855 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
5856 &fl6.flowi6_proto, AF_INET6,
5857 extack);
5858 if (err)
5859 goto errout;
5860 }
5861
5862 if (iif) {
5863 struct net_device *dev;
5864 int flags = 0;
5865
5866 rcu_read_lock();
5867
5868 dev = dev_get_by_index_rcu(net, iif);
5869 if (!dev) {
5870 rcu_read_unlock();
5871 err = -ENODEV;
5872 goto errout;
5873 }
5874
5875 fl6.flowi6_iif = iif;
5876
5877 if (!ipv6_addr_any(&fl6.saddr))
5878 flags |= RT6_LOOKUP_F_HAS_SADDR;
5879
5880 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
5881
5882 rcu_read_unlock();
5883 } else {
5884 fl6.flowi6_oif = oif;
5885
5886 dst = ip6_route_output(net, NULL, &fl6);
5887 }
5888
5889
5890 rt = container_of(dst, struct rt6_info, dst);
5891 if (rt->dst.error) {
5892 err = rt->dst.error;
5893 ip6_rt_put(rt);
5894 goto errout;
5895 }
5896
5897 if (rt == net->ipv6.ip6_null_entry) {
5898 err = rt->dst.error;
5899 ip6_rt_put(rt);
5900 goto errout;
5901 }
5902
5903 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
5904 if (!skb) {
5905 ip6_rt_put(rt);
5906 err = -ENOBUFS;
5907 goto errout;
5908 }
5909
5910 skb_dst_set(skb, &rt->dst);
5911
5912 rcu_read_lock();
5913 from = rcu_dereference(rt->from);
5914 if (from) {
5915 if (fibmatch)
5916 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
5917 iif, RTM_NEWROUTE,
5918 NETLINK_CB(in_skb).portid,
5919 nlh->nlmsg_seq, 0);
5920 else
5921 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
5922 &fl6.saddr, iif, RTM_NEWROUTE,
5923 NETLINK_CB(in_skb).portid,
5924 nlh->nlmsg_seq, 0);
5925 } else {
5926 err = -ENETUNREACH;
5927 }
5928 rcu_read_unlock();
5929
5930 if (err < 0) {
5931 kfree_skb(skb);
5932 goto errout;
5933 }
5934
5935 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5936 errout:
5937 return err;
5938 }
5939
5940 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
5941 unsigned int nlm_flags)
5942 {
5943 struct sk_buff *skb;
5944 struct net *net = info->nl_net;
5945 u32 seq;
5946 int err;
5947
5948 err = -ENOBUFS;
5949 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
5950
5951 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
5952 if (!skb)
5953 goto errout;
5954
5955 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
5956 event, info->portid, seq, nlm_flags);
5957 if (err < 0) {
5958
5959 WARN_ON(err == -EMSGSIZE);
5960 kfree_skb(skb);
5961 goto errout;
5962 }
5963 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
5964 info->nlh, gfp_any());
5965 return;
5966 errout:
5967 if (err < 0)
5968 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
5969 }
5970
5971 void fib6_rt_update(struct net *net, struct fib6_info *rt,
5972 struct nl_info *info)
5973 {
5974 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
5975 struct sk_buff *skb;
5976 int err = -ENOBUFS;
5977
5978
5979
5980
5981 call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL);
5982
5983 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
5984 if (!skb)
5985 goto errout;
5986
5987 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
5988 RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
5989 if (err < 0) {
5990
5991 WARN_ON(err == -EMSGSIZE);
5992 kfree_skb(skb);
5993 goto errout;
5994 }
5995 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
5996 info->nlh, gfp_any());
5997 return;
5998 errout:
5999 if (err < 0)
6000 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6001 }
6002
6003 static int ip6_route_dev_notify(struct notifier_block *this,
6004 unsigned long event, void *ptr)
6005 {
6006 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6007 struct net *net = dev_net(dev);
6008
6009 if (!(dev->flags & IFF_LOOPBACK))
6010 return NOTIFY_OK;
6011
6012 if (event == NETDEV_REGISTER) {
6013 net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev;
6014 net->ipv6.ip6_null_entry->dst.dev = dev;
6015 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
6016 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6017 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
6018 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
6019 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
6020 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
6021 #endif
6022 } else if (event == NETDEV_UNREGISTER &&
6023 dev->reg_state != NETREG_UNREGISTERED) {
6024
6025
6026
6027 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
6028 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6029 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
6030 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
6031 #endif
6032 }
6033
6034 return NOTIFY_OK;
6035 }
6036
6037
6038
6039
6040
6041 #ifdef CONFIG_PROC_FS
6042 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
6043 {
6044 struct net *net = (struct net *)seq->private;
6045 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
6046 net->ipv6.rt6_stats->fib_nodes,
6047 net->ipv6.rt6_stats->fib_route_nodes,
6048 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
6049 net->ipv6.rt6_stats->fib_rt_entries,
6050 net->ipv6.rt6_stats->fib_rt_cache,
6051 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
6052 net->ipv6.rt6_stats->fib_discarded_routes);
6053
6054 return 0;
6055 }
6056 #endif
6057
6058 #ifdef CONFIG_SYSCTL
6059
6060 static
6061 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
6062 void __user *buffer, size_t *lenp, loff_t *ppos)
6063 {
6064 struct net *net;
6065 int delay;
6066 int ret;
6067 if (!write)
6068 return -EINVAL;
6069
6070 net = (struct net *)ctl->extra1;
6071 delay = net->ipv6.sysctl.flush_delay;
6072 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6073 if (ret)
6074 return ret;
6075
6076 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
6077 return 0;
6078 }
6079
6080 static struct ctl_table ipv6_route_table_template[] = {
6081 {
6082 .procname = "flush",
6083 .data = &init_net.ipv6.sysctl.flush_delay,
6084 .maxlen = sizeof(int),
6085 .mode = 0200,
6086 .proc_handler = ipv6_sysctl_rtcache_flush
6087 },
6088 {
6089 .procname = "gc_thresh",
6090 .data = &ip6_dst_ops_template.gc_thresh,
6091 .maxlen = sizeof(int),
6092 .mode = 0644,
6093 .proc_handler = proc_dointvec,
6094 },
6095 {
6096 .procname = "max_size",
6097 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
6098 .maxlen = sizeof(int),
6099 .mode = 0644,
6100 .proc_handler = proc_dointvec,
6101 },
6102 {
6103 .procname = "gc_min_interval",
6104 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6105 .maxlen = sizeof(int),
6106 .mode = 0644,
6107 .proc_handler = proc_dointvec_jiffies,
6108 },
6109 {
6110 .procname = "gc_timeout",
6111 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
6112 .maxlen = sizeof(int),
6113 .mode = 0644,
6114 .proc_handler = proc_dointvec_jiffies,
6115 },
6116 {
6117 .procname = "gc_interval",
6118 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
6119 .maxlen = sizeof(int),
6120 .mode = 0644,
6121 .proc_handler = proc_dointvec_jiffies,
6122 },
6123 {
6124 .procname = "gc_elasticity",
6125 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
6126 .maxlen = sizeof(int),
6127 .mode = 0644,
6128 .proc_handler = proc_dointvec,
6129 },
6130 {
6131 .procname = "mtu_expires",
6132 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
6133 .maxlen = sizeof(int),
6134 .mode = 0644,
6135 .proc_handler = proc_dointvec_jiffies,
6136 },
6137 {
6138 .procname = "min_adv_mss",
6139 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
6140 .maxlen = sizeof(int),
6141 .mode = 0644,
6142 .proc_handler = proc_dointvec,
6143 },
6144 {
6145 .procname = "gc_min_interval_ms",
6146 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6147 .maxlen = sizeof(int),
6148 .mode = 0644,
6149 .proc_handler = proc_dointvec_ms_jiffies,
6150 },
6151 {
6152 .procname = "skip_notify_on_dev_down",
6153 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = proc_dointvec_minmax,
6157 .extra1 = SYSCTL_ZERO,
6158 .extra2 = SYSCTL_ONE,
6159 },
6160 { }
6161 };
6162
6163 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
6164 {
6165 struct ctl_table *table;
6166
6167 table = kmemdup(ipv6_route_table_template,
6168 sizeof(ipv6_route_table_template),
6169 GFP_KERNEL);
6170
6171 if (table) {
6172 table[0].data = &net->ipv6.sysctl.flush_delay;
6173 table[0].extra1 = net;
6174 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
6175 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
6176 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6177 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
6178 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
6179 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
6180 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
6181 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
6182 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6183 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
6184
6185
6186 if (net->user_ns != &init_user_ns)
6187 table[0].procname = NULL;
6188 }
6189
6190 return table;
6191 }
6192 #endif
6193
6194 static int __net_init ip6_route_net_init(struct net *net)
6195 {
6196 int ret = -ENOMEM;
6197
6198 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
6199 sizeof(net->ipv6.ip6_dst_ops));
6200
6201 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
6202 goto out_ip6_dst_ops;
6203
6204 net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true);
6205 if (!net->ipv6.fib6_null_entry)
6206 goto out_ip6_dst_entries;
6207 memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template,
6208 sizeof(*net->ipv6.fib6_null_entry));
6209
6210 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
6211 sizeof(*net->ipv6.ip6_null_entry),
6212 GFP_KERNEL);
6213 if (!net->ipv6.ip6_null_entry)
6214 goto out_fib6_null_entry;
6215 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6216 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
6217 ip6_template_metrics, true);
6218 INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached);
6219
6220 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6221 net->ipv6.fib6_has_custom_rules = false;
6222 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
6223 sizeof(*net->ipv6.ip6_prohibit_entry),
6224 GFP_KERNEL);
6225 if (!net->ipv6.ip6_prohibit_entry)
6226 goto out_ip6_null_entry;
6227 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6228 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
6229 ip6_template_metrics, true);
6230 INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached);
6231
6232 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
6233 sizeof(*net->ipv6.ip6_blk_hole_entry),
6234 GFP_KERNEL);
6235 if (!net->ipv6.ip6_blk_hole_entry)
6236 goto out_ip6_prohibit_entry;
6237 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6238 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
6239 ip6_template_metrics, true);
6240 INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
6241 #endif
6242
6243 net->ipv6.sysctl.flush_delay = 0;
6244 net->ipv6.sysctl.ip6_rt_max_size = 4096;
6245 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
6246 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
6247 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
6248 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
6249 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
6250 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
6251 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
6252
6253 net->ipv6.ip6_rt_gc_expire = 30*HZ;
6254
6255 ret = 0;
6256 out:
6257 return ret;
6258
6259 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6260 out_ip6_prohibit_entry:
6261 kfree(net->ipv6.ip6_prohibit_entry);
6262 out_ip6_null_entry:
6263 kfree(net->ipv6.ip6_null_entry);
6264 #endif
6265 out_fib6_null_entry:
6266 kfree(net->ipv6.fib6_null_entry);
6267 out_ip6_dst_entries:
6268 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6269 out_ip6_dst_ops:
6270 goto out;
6271 }
6272
6273 static void __net_exit ip6_route_net_exit(struct net *net)
6274 {
6275 kfree(net->ipv6.fib6_null_entry);
6276 kfree(net->ipv6.ip6_null_entry);
6277 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6278 kfree(net->ipv6.ip6_prohibit_entry);
6279 kfree(net->ipv6.ip6_blk_hole_entry);
6280 #endif
6281 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6282 }
6283
6284 static int __net_init ip6_route_net_init_late(struct net *net)
6285 {
6286 #ifdef CONFIG_PROC_FS
6287 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
6288 sizeof(struct ipv6_route_iter));
6289 proc_create_net_single("rt6_stats", 0444, net->proc_net,
6290 rt6_stats_seq_show, NULL);
6291 #endif
6292 return 0;
6293 }
6294
6295 static void __net_exit ip6_route_net_exit_late(struct net *net)
6296 {
6297 #ifdef CONFIG_PROC_FS
6298 remove_proc_entry("ipv6_route", net->proc_net);
6299 remove_proc_entry("rt6_stats", net->proc_net);
6300 #endif
6301 }
6302
6303 static struct pernet_operations ip6_route_net_ops = {
6304 .init = ip6_route_net_init,
6305 .exit = ip6_route_net_exit,
6306 };
6307
6308 static int __net_init ipv6_inetpeer_init(struct net *net)
6309 {
6310 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
6311
6312 if (!bp)
6313 return -ENOMEM;
6314 inet_peer_base_init(bp);
6315 net->ipv6.peers = bp;
6316 return 0;
6317 }
6318
6319 static void __net_exit ipv6_inetpeer_exit(struct net *net)
6320 {
6321 struct inet_peer_base *bp = net->ipv6.peers;
6322
6323 net->ipv6.peers = NULL;
6324 inetpeer_invalidate_tree(bp);
6325 kfree(bp);
6326 }
6327
6328 static struct pernet_operations ipv6_inetpeer_ops = {
6329 .init = ipv6_inetpeer_init,
6330 .exit = ipv6_inetpeer_exit,
6331 };
6332
6333 static struct pernet_operations ip6_route_net_late_ops = {
6334 .init = ip6_route_net_init_late,
6335 .exit = ip6_route_net_exit_late,
6336 };
6337
6338 static struct notifier_block ip6_route_dev_notifier = {
6339 .notifier_call = ip6_route_dev_notify,
6340 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
6341 };
6342
6343 void __init ip6_route_init_special_entries(void)
6344 {
6345
6346
6347
6348 init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev;
6349 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
6350 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6351 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6352 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
6353 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6354 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
6355 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6356 #endif
6357 }
6358
6359 int __init ip6_route_init(void)
6360 {
6361 int ret;
6362 int cpu;
6363
6364 ret = -ENOMEM;
6365 ip6_dst_ops_template.kmem_cachep =
6366 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
6367 SLAB_HWCACHE_ALIGN, NULL);
6368 if (!ip6_dst_ops_template.kmem_cachep)
6369 goto out;
6370
6371 ret = dst_entries_init(&ip6_dst_blackhole_ops);
6372 if (ret)
6373 goto out_kmem_cache;
6374
6375 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
6376 if (ret)
6377 goto out_dst_entries;
6378
6379 ret = register_pernet_subsys(&ip6_route_net_ops);
6380 if (ret)
6381 goto out_register_inetpeer;
6382
6383 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
6384
6385 ret = fib6_init();
6386 if (ret)
6387 goto out_register_subsys;
6388
6389 ret = xfrm6_init();
6390 if (ret)
6391 goto out_fib6_init;
6392
6393 ret = fib6_rules_init();
6394 if (ret)
6395 goto xfrm6_init;
6396
6397 ret = register_pernet_subsys(&ip6_route_net_late_ops);
6398 if (ret)
6399 goto fib6_rules_init;
6400
6401 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
6402 inet6_rtm_newroute, NULL, 0);
6403 if (ret < 0)
6404 goto out_register_late_subsys;
6405
6406 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
6407 inet6_rtm_delroute, NULL, 0);
6408 if (ret < 0)
6409 goto out_register_late_subsys;
6410
6411 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
6412 inet6_rtm_getroute, NULL,
6413 RTNL_FLAG_DOIT_UNLOCKED);
6414 if (ret < 0)
6415 goto out_register_late_subsys;
6416
6417 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
6418 if (ret)
6419 goto out_register_late_subsys;
6420
6421 for_each_possible_cpu(cpu) {
6422 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
6423
6424 INIT_LIST_HEAD(&ul->head);
6425 spin_lock_init(&ul->lock);
6426 }
6427
6428 out:
6429 return ret;
6430
6431 out_register_late_subsys:
6432 rtnl_unregister_all(PF_INET6);
6433 unregister_pernet_subsys(&ip6_route_net_late_ops);
6434 fib6_rules_init:
6435 fib6_rules_cleanup();
6436 xfrm6_init:
6437 xfrm6_fini();
6438 out_fib6_init:
6439 fib6_gc_cleanup();
6440 out_register_subsys:
6441 unregister_pernet_subsys(&ip6_route_net_ops);
6442 out_register_inetpeer:
6443 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6444 out_dst_entries:
6445 dst_entries_destroy(&ip6_dst_blackhole_ops);
6446 out_kmem_cache:
6447 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6448 goto out;
6449 }
6450
6451 void ip6_route_cleanup(void)
6452 {
6453 unregister_netdevice_notifier(&ip6_route_dev_notifier);
6454 unregister_pernet_subsys(&ip6_route_net_late_ops);
6455 fib6_rules_cleanup();
6456 xfrm6_fini();
6457 fib6_gc_cleanup();
6458 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6459 unregister_pernet_subsys(&ip6_route_net_ops);
6460 dst_entries_destroy(&ip6_dst_blackhole_ops);
6461 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6462 }