2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * IPv4 Forwarding Information Base: FIB frontend.
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/module.h>
17 #include <asm/uaccess.h>
18 #include <linux/bitops.h>
19 #include <linux/capability.h>
20 #include <linux/types.h>
21 #include <linux/kernel.h>
23 #include <linux/string.h>
24 #include <linux/socket.h>
25 #include <linux/sockios.h>
26 #include <linux/errno.h>
28 #include <linux/inet.h>
29 #include <linux/inetdevice.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_addr.h>
32 #include <linux/if_arp.h>
33 #include <linux/skbuff.h>
34 #include <linux/cache.h>
35 #include <linux/init.h>
36 #include <linux/list.h>
37 #include <linux/slab.h>
40 #include <net/protocol.h>
41 #include <net/route.h>
45 #include <net/ip_fib.h>
46 #include <net/rtnetlink.h>
49 #include <trace/events/fib.h>
51 #ifndef CONFIG_IP_MULTIPLE_TABLES
53 static int __net_init
fib4_rules_init(struct net
*net
)
55 struct fib_table
*local_table
, *main_table
;
57 main_table
= fib_trie_table(RT_TABLE_MAIN
, NULL
);
61 local_table
= fib_trie_table(RT_TABLE_LOCAL
, main_table
);
65 hlist_add_head_rcu(&local_table
->tb_hlist
,
66 &net
->ipv4
.fib_table_hash
[TABLE_LOCAL_INDEX
]);
67 hlist_add_head_rcu(&main_table
->tb_hlist
,
68 &net
->ipv4
.fib_table_hash
[TABLE_MAIN_INDEX
]);
72 fib_free_table(main_table
);
77 struct fib_table
*fib_new_table(struct net
*net
, u32 id
)
79 struct fib_table
*tb
, *alias
= NULL
;
84 tb
= fib_get_table(net
, id
);
88 if (id
== RT_TABLE_LOCAL
)
89 alias
= fib_new_table(net
, RT_TABLE_MAIN
);
91 tb
= fib_trie_table(id
, alias
);
97 rcu_assign_pointer(net
->ipv4
.fib_local
, tb
);
100 rcu_assign_pointer(net
->ipv4
.fib_main
, tb
);
102 case RT_TABLE_DEFAULT
:
103 rcu_assign_pointer(net
->ipv4
.fib_default
, tb
);
109 h
= id
& (FIB_TABLE_HASHSZ
- 1);
110 hlist_add_head_rcu(&tb
->tb_hlist
, &net
->ipv4
.fib_table_hash
[h
]);
114 /* caller must hold either rtnl or rcu read lock */
115 struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
117 struct fib_table
*tb
;
118 struct hlist_head
*head
;
123 h
= id
& (FIB_TABLE_HASHSZ
- 1);
125 head
= &net
->ipv4
.fib_table_hash
[h
];
126 hlist_for_each_entry_rcu(tb
, head
, tb_hlist
) {
132 #endif /* CONFIG_IP_MULTIPLE_TABLES */
134 static void fib_replace_table(struct net
*net
, struct fib_table
*old
,
135 struct fib_table
*new)
137 #ifdef CONFIG_IP_MULTIPLE_TABLES
138 switch (new->tb_id
) {
140 rcu_assign_pointer(net
->ipv4
.fib_local
, new);
143 rcu_assign_pointer(net
->ipv4
.fib_main
, new);
145 case RT_TABLE_DEFAULT
:
146 rcu_assign_pointer(net
->ipv4
.fib_default
, new);
153 /* replace the old table in the hlist */
154 hlist_replace_rcu(&old
->tb_hlist
, &new->tb_hlist
);
157 int fib_unmerge(struct net
*net
)
159 struct fib_table
*old
, *new;
161 /* attempt to fetch local table if it has been allocated */
162 old
= fib_get_table(net
, RT_TABLE_LOCAL
);
166 new = fib_trie_unmerge(old
);
170 /* replace merged table with clean table */
172 fib_replace_table(net
, old
, new);
179 static void fib_flush(struct net
*net
)
184 for (h
= 0; h
< FIB_TABLE_HASHSZ
; h
++) {
185 struct hlist_head
*head
= &net
->ipv4
.fib_table_hash
[h
];
186 struct hlist_node
*tmp
;
187 struct fib_table
*tb
;
189 hlist_for_each_entry_safe(tb
, tmp
, head
, tb_hlist
)
190 flushed
+= fib_table_flush(tb
);
197 void fib_flush_external(struct net
*net
)
199 struct fib_table
*tb
;
200 struct hlist_head
*head
;
203 for (h
= 0; h
< FIB_TABLE_HASHSZ
; h
++) {
204 head
= &net
->ipv4
.fib_table_hash
[h
];
205 hlist_for_each_entry(tb
, head
, tb_hlist
)
206 fib_table_flush_external(tb
);
211 * Find address type as if only "dev" was present in the system. If
212 * on_dev is NULL then all interfaces are taken into consideration.
214 static inline unsigned int __inet_dev_addr_type(struct net
*net
,
215 const struct net_device
*dev
,
216 __be32 addr
, u32 tb_id
)
218 struct flowi4 fl4
= { .daddr
= addr
};
219 struct fib_result res
;
220 unsigned int ret
= RTN_BROADCAST
;
221 struct fib_table
*table
;
223 if (ipv4_is_zeronet(addr
) || ipv4_is_lbcast(addr
))
224 return RTN_BROADCAST
;
225 if (ipv4_is_multicast(addr
))
226 return RTN_MULTICAST
;
230 table
= fib_get_table(net
, tb_id
);
233 if (!fib_table_lookup(table
, &fl4
, &res
, FIB_LOOKUP_NOREF
)) {
234 if (!dev
|| dev
== res
.fi
->fib_dev
)
243 unsigned int inet_addr_type_table(struct net
*net
, __be32 addr
, u32 tb_id
)
245 return __inet_dev_addr_type(net
, NULL
, addr
, tb_id
);
247 EXPORT_SYMBOL(inet_addr_type_table
);
249 unsigned int inet_addr_type(struct net
*net
, __be32 addr
)
251 return __inet_dev_addr_type(net
, NULL
, addr
, RT_TABLE_LOCAL
);
253 EXPORT_SYMBOL(inet_addr_type
);
255 unsigned int inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
,
258 u32 rt_table
= vrf_dev_table(dev
) ? : RT_TABLE_LOCAL
;
260 return __inet_dev_addr_type(net
, dev
, addr
, rt_table
);
262 EXPORT_SYMBOL(inet_dev_addr_type
);
264 /* inet_addr_type with dev == NULL but using the table from a dev
265 * if one is associated
267 unsigned int inet_addr_type_dev_table(struct net
*net
,
268 const struct net_device
*dev
,
271 u32 rt_table
= vrf_dev_table(dev
) ? : RT_TABLE_LOCAL
;
273 return __inet_dev_addr_type(net
, NULL
, addr
, rt_table
);
275 EXPORT_SYMBOL(inet_addr_type_dev_table
);
277 __be32
fib_compute_spec_dst(struct sk_buff
*skb
)
279 struct net_device
*dev
= skb
->dev
;
280 struct in_device
*in_dev
;
281 struct fib_result res
;
287 rt
= skb_rtable(skb
);
288 if ((rt
->rt_flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
| RTCF_LOCAL
)) ==
290 return ip_hdr(skb
)->daddr
;
292 in_dev
= __in_dev_get_rcu(dev
);
297 scope
= RT_SCOPE_UNIVERSE
;
298 if (!ipv4_is_zeronet(ip_hdr(skb
)->saddr
)) {
300 fl4
.flowi4_iif
= LOOPBACK_IFINDEX
;
301 fl4
.daddr
= ip_hdr(skb
)->saddr
;
303 fl4
.flowi4_tos
= RT_TOS(ip_hdr(skb
)->tos
);
304 fl4
.flowi4_scope
= scope
;
305 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(in_dev
) ? skb
->mark
: 0;
306 fl4
.flowi4_tun_key
.tun_id
= 0;
307 if (!fib_lookup(net
, &fl4
, &res
, 0))
308 return FIB_RES_PREFSRC(net
, res
);
310 scope
= RT_SCOPE_LINK
;
313 return inet_select_addr(dev
, ip_hdr(skb
)->saddr
, scope
);
316 /* Given (packet source, input interface) and optional (dst, oif, tos):
317 * - (main) check, that source is valid i.e. not broadcast or our local
319 * - figure out what "logical" interface this packet arrived
320 * and calculate "specific destination" address.
321 * - check, that packet arrived from expected physical interface.
322 * called with rcu_read_lock()
324 static int __fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
325 u8 tos
, int oif
, struct net_device
*dev
,
326 int rpf
, struct in_device
*idev
, u32
*itag
)
329 struct fib_result res
;
335 fl4
.flowi4_iif
= vrf_master_ifindex_rcu(dev
);
337 fl4
.flowi4_iif
= oif
? : LOOPBACK_IFINDEX
;
340 fl4
.flowi4_tos
= tos
;
341 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
342 fl4
.flowi4_tun_key
.tun_id
= 0;
344 no_addr
= idev
->ifa_list
== NULL
;
346 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(idev
) ? skb
->mark
: 0;
348 trace_fib_validate_source(dev
, &fl4
);
351 if (fib_lookup(net
, &fl4
, &res
, 0))
353 if (res
.type
!= RTN_UNICAST
&&
354 (res
.type
!= RTN_LOCAL
|| !IN_DEV_ACCEPT_LOCAL(idev
)))
356 if (!rpf
&& !fib_num_tclassid_users(dev_net(dev
)) &&
357 (dev
->ifindex
!= oif
|| !IN_DEV_TX_REDIRECTS(idev
)))
359 fib_combine_itag(itag
, &res
);
362 #ifdef CONFIG_IP_ROUTE_MULTIPATH
363 for (ret
= 0; ret
< res
.fi
->fib_nhs
; ret
++) {
364 struct fib_nh
*nh
= &res
.fi
->fib_nh
[ret
];
366 if (nh
->nh_dev
== dev
) {
369 } else if (vrf_master_ifindex_rcu(nh
->nh_dev
) == dev
->ifindex
) {
375 if (FIB_RES_DEV(res
) == dev
)
379 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
386 fl4
.flowi4_oif
= dev
->ifindex
;
389 if (fib_lookup(net
, &fl4
, &res
, FIB_LOOKUP_IGNORE_LINKSTATE
) == 0) {
390 if (res
.type
== RTN_UNICAST
)
391 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
407 /* Ignore rp_filter for packets protected by IPsec. */
408 int fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
409 u8 tos
, int oif
, struct net_device
*dev
,
410 struct in_device
*idev
, u32
*itag
)
412 int r
= secpath_exists(skb
) ? 0 : IN_DEV_RPFILTER(idev
);
414 if (!r
&& !fib_num_tclassid_users(dev_net(dev
)) &&
415 IN_DEV_ACCEPT_LOCAL(idev
) &&
416 (dev
->ifindex
!= oif
|| !IN_DEV_TX_REDIRECTS(idev
))) {
420 return __fib_validate_source(skb
, src
, dst
, tos
, oif
, dev
, r
, idev
, itag
);
423 static inline __be32
sk_extract_addr(struct sockaddr
*addr
)
425 return ((struct sockaddr_in
*) addr
)->sin_addr
.s_addr
;
428 static int put_rtax(struct nlattr
*mx
, int len
, int type
, u32 value
)
432 nla
= (struct nlattr
*) ((char *) mx
+ len
);
433 nla
->nla_type
= type
;
434 nla
->nla_len
= nla_attr_size(4);
435 *(u32
*) nla_data(nla
) = value
;
437 return len
+ nla_total_size(4);
440 static int rtentry_to_fib_config(struct net
*net
, int cmd
, struct rtentry
*rt
,
441 struct fib_config
*cfg
)
446 memset(cfg
, 0, sizeof(*cfg
));
447 cfg
->fc_nlinfo
.nl_net
= net
;
449 if (rt
->rt_dst
.sa_family
!= AF_INET
)
450 return -EAFNOSUPPORT
;
453 * Check mask for validity:
454 * a) it must be contiguous.
455 * b) destination must have all host bits clear.
456 * c) if application forgot to set correct family (AF_INET),
457 * reject request unless it is absolutely clear i.e.
458 * both family and mask are zero.
461 addr
= sk_extract_addr(&rt
->rt_dst
);
462 if (!(rt
->rt_flags
& RTF_HOST
)) {
463 __be32 mask
= sk_extract_addr(&rt
->rt_genmask
);
465 if (rt
->rt_genmask
.sa_family
!= AF_INET
) {
466 if (mask
|| rt
->rt_genmask
.sa_family
)
467 return -EAFNOSUPPORT
;
470 if (bad_mask(mask
, addr
))
473 plen
= inet_mask_len(mask
);
476 cfg
->fc_dst_len
= plen
;
479 if (cmd
!= SIOCDELRT
) {
480 cfg
->fc_nlflags
= NLM_F_CREATE
;
481 cfg
->fc_protocol
= RTPROT_BOOT
;
485 cfg
->fc_priority
= rt
->rt_metric
- 1;
487 if (rt
->rt_flags
& RTF_REJECT
) {
488 cfg
->fc_scope
= RT_SCOPE_HOST
;
489 cfg
->fc_type
= RTN_UNREACHABLE
;
493 cfg
->fc_scope
= RT_SCOPE_NOWHERE
;
494 cfg
->fc_type
= RTN_UNICAST
;
498 struct net_device
*dev
;
499 char devname
[IFNAMSIZ
];
501 if (copy_from_user(devname
, rt
->rt_dev
, IFNAMSIZ
-1))
504 devname
[IFNAMSIZ
-1] = 0;
505 colon
= strchr(devname
, ':');
508 dev
= __dev_get_by_name(net
, devname
);
511 cfg
->fc_oif
= dev
->ifindex
;
513 struct in_ifaddr
*ifa
;
514 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
518 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
)
519 if (strcmp(ifa
->ifa_label
, devname
) == 0)
523 cfg
->fc_prefsrc
= ifa
->ifa_local
;
527 addr
= sk_extract_addr(&rt
->rt_gateway
);
528 if (rt
->rt_gateway
.sa_family
== AF_INET
&& addr
) {
529 unsigned int addr_type
;
532 addr_type
= inet_addr_type_table(net
, addr
, cfg
->fc_table
);
533 if (rt
->rt_flags
& RTF_GATEWAY
&&
534 addr_type
== RTN_UNICAST
)
535 cfg
->fc_scope
= RT_SCOPE_UNIVERSE
;
538 if (cmd
== SIOCDELRT
)
541 if (rt
->rt_flags
& RTF_GATEWAY
&& !cfg
->fc_gw
)
544 if (cfg
->fc_scope
== RT_SCOPE_NOWHERE
)
545 cfg
->fc_scope
= RT_SCOPE_LINK
;
547 if (rt
->rt_flags
& (RTF_MTU
| RTF_WINDOW
| RTF_IRTT
)) {
551 mx
= kzalloc(3 * nla_total_size(4), GFP_KERNEL
);
555 if (rt
->rt_flags
& RTF_MTU
)
556 len
= put_rtax(mx
, len
, RTAX_ADVMSS
, rt
->rt_mtu
- 40);
558 if (rt
->rt_flags
& RTF_WINDOW
)
559 len
= put_rtax(mx
, len
, RTAX_WINDOW
, rt
->rt_window
);
561 if (rt
->rt_flags
& RTF_IRTT
)
562 len
= put_rtax(mx
, len
, RTAX_RTT
, rt
->rt_irtt
<< 3);
565 cfg
->fc_mx_len
= len
;
572 * Handle IP routing ioctl calls.
573 * These are used to manipulate the routing tables
575 int ip_rt_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
577 struct fib_config cfg
;
582 case SIOCADDRT
: /* Add a route */
583 case SIOCDELRT
: /* Delete a route */
584 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
587 if (copy_from_user(&rt
, arg
, sizeof(rt
)))
591 err
= rtentry_to_fib_config(net
, cmd
, &rt
, &cfg
);
593 struct fib_table
*tb
;
595 if (cmd
== SIOCDELRT
) {
596 tb
= fib_get_table(net
, cfg
.fc_table
);
598 err
= fib_table_delete(tb
, &cfg
);
602 tb
= fib_new_table(net
, cfg
.fc_table
);
604 err
= fib_table_insert(tb
, &cfg
);
609 /* allocated by rtentry_to_fib_config() */
618 const struct nla_policy rtm_ipv4_policy
[RTA_MAX
+ 1] = {
619 [RTA_DST
] = { .type
= NLA_U32
},
620 [RTA_SRC
] = { .type
= NLA_U32
},
621 [RTA_IIF
] = { .type
= NLA_U32
},
622 [RTA_OIF
] = { .type
= NLA_U32
},
623 [RTA_GATEWAY
] = { .type
= NLA_U32
},
624 [RTA_PRIORITY
] = { .type
= NLA_U32
},
625 [RTA_PREFSRC
] = { .type
= NLA_U32
},
626 [RTA_METRICS
] = { .type
= NLA_NESTED
},
627 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
628 [RTA_FLOW
] = { .type
= NLA_U32
},
629 [RTA_ENCAP_TYPE
] = { .type
= NLA_U16
},
630 [RTA_ENCAP
] = { .type
= NLA_NESTED
},
633 static int rtm_to_fib_config(struct net
*net
, struct sk_buff
*skb
,
634 struct nlmsghdr
*nlh
, struct fib_config
*cfg
)
640 err
= nlmsg_validate(nlh
, sizeof(*rtm
), RTA_MAX
, rtm_ipv4_policy
);
644 memset(cfg
, 0, sizeof(*cfg
));
646 rtm
= nlmsg_data(nlh
);
647 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
648 cfg
->fc_tos
= rtm
->rtm_tos
;
649 cfg
->fc_table
= rtm
->rtm_table
;
650 cfg
->fc_protocol
= rtm
->rtm_protocol
;
651 cfg
->fc_scope
= rtm
->rtm_scope
;
652 cfg
->fc_type
= rtm
->rtm_type
;
653 cfg
->fc_flags
= rtm
->rtm_flags
;
654 cfg
->fc_nlflags
= nlh
->nlmsg_flags
;
656 cfg
->fc_nlinfo
.portid
= NETLINK_CB(skb
).portid
;
657 cfg
->fc_nlinfo
.nlh
= nlh
;
658 cfg
->fc_nlinfo
.nl_net
= net
;
660 if (cfg
->fc_type
> RTN_MAX
) {
665 nlmsg_for_each_attr(attr
, nlh
, sizeof(struct rtmsg
), remaining
) {
666 switch (nla_type(attr
)) {
668 cfg
->fc_dst
= nla_get_be32(attr
);
671 cfg
->fc_oif
= nla_get_u32(attr
);
674 cfg
->fc_gw
= nla_get_be32(attr
);
677 cfg
->fc_priority
= nla_get_u32(attr
);
680 cfg
->fc_prefsrc
= nla_get_be32(attr
);
683 cfg
->fc_mx
= nla_data(attr
);
684 cfg
->fc_mx_len
= nla_len(attr
);
687 cfg
->fc_mp
= nla_data(attr
);
688 cfg
->fc_mp_len
= nla_len(attr
);
691 cfg
->fc_flow
= nla_get_u32(attr
);
694 cfg
->fc_table
= nla_get_u32(attr
);
697 cfg
->fc_encap
= attr
;
700 cfg
->fc_encap_type
= nla_get_u16(attr
);
710 static int inet_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
712 struct net
*net
= sock_net(skb
->sk
);
713 struct fib_config cfg
;
714 struct fib_table
*tb
;
717 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
721 tb
= fib_get_table(net
, cfg
.fc_table
);
727 err
= fib_table_delete(tb
, &cfg
);
732 static int inet_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
734 struct net
*net
= sock_net(skb
->sk
);
735 struct fib_config cfg
;
736 struct fib_table
*tb
;
739 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
743 tb
= fib_new_table(net
, cfg
.fc_table
);
749 err
= fib_table_insert(tb
, &cfg
);
754 static int inet_dump_fib(struct sk_buff
*skb
, struct netlink_callback
*cb
)
756 struct net
*net
= sock_net(skb
->sk
);
758 unsigned int e
= 0, s_e
;
759 struct fib_table
*tb
;
760 struct hlist_head
*head
;
763 if (nlmsg_len(cb
->nlh
) >= sizeof(struct rtmsg
) &&
764 ((struct rtmsg
*) nlmsg_data(cb
->nlh
))->rtm_flags
& RTM_F_CLONED
)
772 for (h
= s_h
; h
< FIB_TABLE_HASHSZ
; h
++, s_e
= 0) {
774 head
= &net
->ipv4
.fib_table_hash
[h
];
775 hlist_for_each_entry_rcu(tb
, head
, tb_hlist
) {
779 memset(&cb
->args
[2], 0, sizeof(cb
->args
) -
780 2 * sizeof(cb
->args
[0]));
781 if (fib_table_dump(tb
, skb
, cb
) < 0)
797 /* Prepare and feed intra-kernel routing request.
798 * Really, it should be netlink message, but :-( netlink
799 * can be not configured, so that we feed it directly
800 * to fib engine. It is legal, because all events occur
801 * only when netlink is already locked.
803 static void fib_magic(int cmd
, int type
, __be32 dst
, int dst_len
, struct in_ifaddr
*ifa
)
805 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
806 u32 tb_id
= vrf_dev_table_rtnl(ifa
->ifa_dev
->dev
);
807 struct fib_table
*tb
;
808 struct fib_config cfg
= {
809 .fc_protocol
= RTPROT_KERNEL
,
812 .fc_dst_len
= dst_len
,
813 .fc_prefsrc
= ifa
->ifa_local
,
814 .fc_oif
= ifa
->ifa_dev
->dev
->ifindex
,
815 .fc_nlflags
= NLM_F_CREATE
| NLM_F_APPEND
,
822 tb_id
= (type
== RTN_UNICAST
) ? RT_TABLE_MAIN
: RT_TABLE_LOCAL
;
824 tb
= fib_new_table(net
, tb_id
);
828 cfg
.fc_table
= tb
->tb_id
;
830 if (type
!= RTN_LOCAL
)
831 cfg
.fc_scope
= RT_SCOPE_LINK
;
833 cfg
.fc_scope
= RT_SCOPE_HOST
;
835 if (cmd
== RTM_NEWROUTE
)
836 fib_table_insert(tb
, &cfg
);
838 fib_table_delete(tb
, &cfg
);
841 void fib_add_ifaddr(struct in_ifaddr
*ifa
)
843 struct in_device
*in_dev
= ifa
->ifa_dev
;
844 struct net_device
*dev
= in_dev
->dev
;
845 struct in_ifaddr
*prim
= ifa
;
846 __be32 mask
= ifa
->ifa_mask
;
847 __be32 addr
= ifa
->ifa_local
;
848 __be32 prefix
= ifa
->ifa_address
& mask
;
850 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
851 prim
= inet_ifa_byprefix(in_dev
, prefix
, mask
);
853 pr_warn("%s: bug: prim == NULL\n", __func__
);
858 fib_magic(RTM_NEWROUTE
, RTN_LOCAL
, addr
, 32, prim
);
860 if (!(dev
->flags
& IFF_UP
))
863 /* Add broadcast address, if it is explicitly assigned. */
864 if (ifa
->ifa_broadcast
&& ifa
->ifa_broadcast
!= htonl(0xFFFFFFFF))
865 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
867 if (!ipv4_is_zeronet(prefix
) && !(ifa
->ifa_flags
& IFA_F_SECONDARY
) &&
868 (prefix
!= addr
|| ifa
->ifa_prefixlen
< 32)) {
869 fib_magic(RTM_NEWROUTE
,
870 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
871 prefix
, ifa
->ifa_prefixlen
, prim
);
873 /* Add network specific broadcasts, when it takes a sense */
874 if (ifa
->ifa_prefixlen
< 31) {
875 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
, 32, prim
);
876 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
| ~mask
,
882 /* Delete primary or secondary address.
883 * Optionally, on secondary address promotion consider the addresses
884 * from subnet iprim as deleted, even if they are in device list.
885 * In this case the secondary ifa can be in device list.
887 void fib_del_ifaddr(struct in_ifaddr
*ifa
, struct in_ifaddr
*iprim
)
889 struct in_device
*in_dev
= ifa
->ifa_dev
;
890 struct net_device
*dev
= in_dev
->dev
;
891 struct in_ifaddr
*ifa1
;
892 struct in_ifaddr
*prim
= ifa
, *prim1
= NULL
;
893 __be32 brd
= ifa
->ifa_address
| ~ifa
->ifa_mask
;
894 __be32 any
= ifa
->ifa_address
& ifa
->ifa_mask
;
900 int subnet
= 0; /* Primary network */
901 int gone
= 1; /* Address is missing */
902 int same_prefsrc
= 0; /* Another primary with same IP */
904 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
905 prim
= inet_ifa_byprefix(in_dev
, any
, ifa
->ifa_mask
);
907 pr_warn("%s: bug: prim == NULL\n", __func__
);
910 if (iprim
&& iprim
!= prim
) {
911 pr_warn("%s: bug: iprim != prim\n", __func__
);
914 } else if (!ipv4_is_zeronet(any
) &&
915 (any
!= ifa
->ifa_local
|| ifa
->ifa_prefixlen
< 32)) {
916 fib_magic(RTM_DELROUTE
,
917 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
918 any
, ifa
->ifa_prefixlen
, prim
);
922 /* Deletion is more complicated than add.
923 * We should take care of not to delete too much :-)
925 * Scan address list to be sure that addresses are really gone.
928 for (ifa1
= in_dev
->ifa_list
; ifa1
; ifa1
= ifa1
->ifa_next
) {
930 /* promotion, keep the IP */
934 /* Ignore IFAs from our subnet */
935 if (iprim
&& ifa1
->ifa_mask
== iprim
->ifa_mask
&&
936 inet_ifa_match(ifa1
->ifa_address
, iprim
))
939 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
940 if (ifa1
->ifa_flags
& IFA_F_SECONDARY
) {
941 /* Another address from our subnet? */
942 if (ifa1
->ifa_mask
== prim
->ifa_mask
&&
943 inet_ifa_match(ifa1
->ifa_address
, prim
))
946 /* We reached the secondaries, so
947 * same_prefsrc should be determined.
951 /* Search new prim1 if ifa1 is not
952 * using the current prim1
955 ifa1
->ifa_mask
!= prim1
->ifa_mask
||
956 !inet_ifa_match(ifa1
->ifa_address
, prim1
))
957 prim1
= inet_ifa_byprefix(in_dev
,
962 if (prim1
->ifa_local
!= prim
->ifa_local
)
966 if (prim
->ifa_local
!= ifa1
->ifa_local
)
972 if (ifa
->ifa_local
== ifa1
->ifa_local
)
974 if (ifa
->ifa_broadcast
== ifa1
->ifa_broadcast
)
976 if (brd
== ifa1
->ifa_broadcast
)
978 if (any
== ifa1
->ifa_broadcast
)
980 /* primary has network specific broadcasts */
981 if (prim1
== ifa1
&& ifa1
->ifa_prefixlen
< 31) {
982 __be32 brd1
= ifa1
->ifa_address
| ~ifa1
->ifa_mask
;
983 __be32 any1
= ifa1
->ifa_address
& ifa1
->ifa_mask
;
985 if (!ipv4_is_zeronet(any1
)) {
986 if (ifa
->ifa_broadcast
== brd1
||
987 ifa
->ifa_broadcast
== any1
)
989 if (brd
== brd1
|| brd
== any1
)
991 if (any
== brd1
|| any
== any1
)
998 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
999 if (subnet
&& ifa
->ifa_prefixlen
< 31) {
1000 if (!(ok
& BRD1_OK
))
1001 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, brd
, 32, prim
);
1002 if (!(ok
& BRD0_OK
))
1003 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, any
, 32, prim
);
1005 if (!(ok
& LOCAL_OK
)) {
1006 unsigned int addr_type
;
1008 fib_magic(RTM_DELROUTE
, RTN_LOCAL
, ifa
->ifa_local
, 32, prim
);
1010 /* Check, that this local address finally disappeared. */
1011 addr_type
= inet_addr_type_dev_table(dev_net(dev
), dev
,
1013 if (gone
&& addr_type
!= RTN_LOCAL
) {
1014 /* And the last, but not the least thing.
1015 * We must flush stray FIB entries.
1017 * First of all, we scan fib_info list searching
1018 * for stray nexthop entries, then ignite fib_flush.
1020 if (fib_sync_down_addr(dev_net(dev
), ifa
->ifa_local
))
1021 fib_flush(dev_net(dev
));
1030 static void nl_fib_lookup(struct net
*net
, struct fib_result_nl
*frn
)
1033 struct fib_result res
;
1034 struct flowi4 fl4
= {
1035 .flowi4_mark
= frn
->fl_mark
,
1036 .daddr
= frn
->fl_addr
,
1037 .flowi4_tos
= frn
->fl_tos
,
1038 .flowi4_scope
= frn
->fl_scope
,
1040 struct fib_table
*tb
;
1044 tb
= fib_get_table(net
, frn
->tb_id_in
);
1050 frn
->tb_id
= tb
->tb_id
;
1051 frn
->err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
1054 frn
->prefixlen
= res
.prefixlen
;
1055 frn
->nh_sel
= res
.nh_sel
;
1056 frn
->type
= res
.type
;
1057 frn
->scope
= res
.scope
;
1065 static void nl_fib_input(struct sk_buff
*skb
)
1068 struct fib_result_nl
*frn
;
1069 struct nlmsghdr
*nlh
;
1072 net
= sock_net(skb
->sk
);
1073 nlh
= nlmsg_hdr(skb
);
1074 if (skb
->len
< NLMSG_HDRLEN
|| skb
->len
< nlh
->nlmsg_len
||
1075 nlmsg_len(nlh
) < sizeof(*frn
))
1078 skb
= netlink_skb_clone(skb
, GFP_KERNEL
);
1081 nlh
= nlmsg_hdr(skb
);
1083 frn
= (struct fib_result_nl
*) nlmsg_data(nlh
);
1084 nl_fib_lookup(net
, frn
);
1086 portid
= NETLINK_CB(skb
).portid
; /* netlink portid */
1087 NETLINK_CB(skb
).portid
= 0; /* from kernel */
1088 NETLINK_CB(skb
).dst_group
= 0; /* unicast */
1089 netlink_unicast(net
->ipv4
.fibnl
, skb
, portid
, MSG_DONTWAIT
);
1092 static int __net_init
nl_fib_lookup_init(struct net
*net
)
1095 struct netlink_kernel_cfg cfg
= {
1096 .input
= nl_fib_input
,
1099 sk
= netlink_kernel_create(net
, NETLINK_FIB_LOOKUP
, &cfg
);
1101 return -EAFNOSUPPORT
;
1102 net
->ipv4
.fibnl
= sk
;
1106 static void nl_fib_lookup_exit(struct net
*net
)
1108 netlink_kernel_release(net
->ipv4
.fibnl
);
1109 net
->ipv4
.fibnl
= NULL
;
1112 static void fib_disable_ip(struct net_device
*dev
, unsigned long event
)
1114 if (fib_sync_down_dev(dev
, event
))
1115 fib_flush(dev_net(dev
));
1116 rt_cache_flush(dev_net(dev
));
1120 static int fib_inetaddr_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1122 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
1123 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
1124 struct net
*net
= dev_net(dev
);
1128 fib_add_ifaddr(ifa
);
1129 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1130 fib_sync_up(dev
, RTNH_F_DEAD
);
1132 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1133 rt_cache_flush(dev_net(dev
));
1136 fib_del_ifaddr(ifa
, NULL
);
1137 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1138 if (!ifa
->ifa_dev
->ifa_list
) {
1139 /* Last address was deleted from this interface.
1142 fib_disable_ip(dev
, event
);
1144 rt_cache_flush(dev_net(dev
));
1151 static int fib_netdev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1153 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1154 struct in_device
*in_dev
;
1155 struct net
*net
= dev_net(dev
);
1158 if (event
== NETDEV_UNREGISTER
) {
1159 fib_disable_ip(dev
, event
);
1164 in_dev
= __in_dev_get_rtnl(dev
);
1171 fib_add_ifaddr(ifa
);
1172 } endfor_ifa(in_dev
);
1173 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1174 fib_sync_up(dev
, RTNH_F_DEAD
);
1176 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1177 rt_cache_flush(net
);
1180 fib_disable_ip(dev
, event
);
1183 flags
= dev_get_flags(dev
);
1184 if (flags
& (IFF_RUNNING
| IFF_LOWER_UP
))
1185 fib_sync_up(dev
, RTNH_F_LINKDOWN
);
1187 fib_sync_down_dev(dev
, event
);
1189 case NETDEV_CHANGEMTU
:
1190 rt_cache_flush(net
);
1196 static struct notifier_block fib_inetaddr_notifier
= {
1197 .notifier_call
= fib_inetaddr_event
,
1200 static struct notifier_block fib_netdev_notifier
= {
1201 .notifier_call
= fib_netdev_event
,
1204 static int __net_init
ip_fib_net_init(struct net
*net
)
1207 size_t size
= sizeof(struct hlist_head
) * FIB_TABLE_HASHSZ
;
1209 /* Avoid false sharing : Use at least a full cache line */
1210 size
= max_t(size_t, size
, L1_CACHE_BYTES
);
1212 net
->ipv4
.fib_table_hash
= kzalloc(size
, GFP_KERNEL
);
1213 if (!net
->ipv4
.fib_table_hash
)
1216 err
= fib4_rules_init(net
);
1222 kfree(net
->ipv4
.fib_table_hash
);
1226 static void ip_fib_net_exit(struct net
*net
)
1231 #ifdef CONFIG_IP_MULTIPLE_TABLES
1232 RCU_INIT_POINTER(net
->ipv4
.fib_local
, NULL
);
1233 RCU_INIT_POINTER(net
->ipv4
.fib_main
, NULL
);
1234 RCU_INIT_POINTER(net
->ipv4
.fib_default
, NULL
);
1236 for (i
= 0; i
< FIB_TABLE_HASHSZ
; i
++) {
1237 struct hlist_head
*head
= &net
->ipv4
.fib_table_hash
[i
];
1238 struct hlist_node
*tmp
;
1239 struct fib_table
*tb
;
1241 hlist_for_each_entry_safe(tb
, tmp
, head
, tb_hlist
) {
1242 hlist_del(&tb
->tb_hlist
);
1243 fib_table_flush(tb
);
1248 #ifdef CONFIG_IP_MULTIPLE_TABLES
1249 fib4_rules_exit(net
);
1252 kfree(net
->ipv4
.fib_table_hash
);
1255 static int __net_init
fib_net_init(struct net
*net
)
1259 #ifdef CONFIG_IP_ROUTE_CLASSID
1260 net
->ipv4
.fib_num_tclassid_users
= 0;
1262 error
= ip_fib_net_init(net
);
1265 error
= nl_fib_lookup_init(net
);
1268 error
= fib_proc_init(net
);
1275 nl_fib_lookup_exit(net
);
1277 ip_fib_net_exit(net
);
1281 static void __net_exit
fib_net_exit(struct net
*net
)
1284 nl_fib_lookup_exit(net
);
1285 ip_fib_net_exit(net
);
1288 static struct pernet_operations fib_net_ops
= {
1289 .init
= fib_net_init
,
1290 .exit
= fib_net_exit
,
1293 void __init
ip_fib_init(void)
1295 rtnl_register(PF_INET
, RTM_NEWROUTE
, inet_rtm_newroute
, NULL
, NULL
);
1296 rtnl_register(PF_INET
, RTM_DELROUTE
, inet_rtm_delroute
, NULL
, NULL
);
1297 rtnl_register(PF_INET
, RTM_GETROUTE
, NULL
, inet_dump_fib
, NULL
);
1299 register_pernet_subsys(&fib_net_ops
);
1300 register_netdevice_notifier(&fib_netdev_notifier
);
1301 register_inetaddr_notifier(&fib_inetaddr_notifier
);