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 #ifndef CONFIG_IP_MULTIPLE_TABLES
51 static int __net_init
fib4_rules_init(struct net
*net
)
53 struct fib_table
*local_table
, *main_table
;
55 local_table
= fib_trie_table(RT_TABLE_LOCAL
);
56 if (local_table
== NULL
)
59 main_table
= fib_trie_table(RT_TABLE_MAIN
);
60 if (main_table
== NULL
)
63 hlist_add_head_rcu(&local_table
->tb_hlist
,
64 &net
->ipv4
.fib_table_hash
[TABLE_LOCAL_INDEX
]);
65 hlist_add_head_rcu(&main_table
->tb_hlist
,
66 &net
->ipv4
.fib_table_hash
[TABLE_MAIN_INDEX
]);
75 struct fib_table
*fib_new_table(struct net
*net
, u32 id
)
82 tb
= fib_get_table(net
, id
);
86 tb
= fib_trie_table(id
);
92 net
->ipv4
.fib_local
= tb
;
96 net
->ipv4
.fib_main
= tb
;
99 case RT_TABLE_DEFAULT
:
100 net
->ipv4
.fib_default
= tb
;
107 h
= id
& (FIB_TABLE_HASHSZ
- 1);
108 hlist_add_head_rcu(&tb
->tb_hlist
, &net
->ipv4
.fib_table_hash
[h
]);
112 struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
114 struct fib_table
*tb
;
115 struct hlist_head
*head
;
120 h
= id
& (FIB_TABLE_HASHSZ
- 1);
123 head
= &net
->ipv4
.fib_table_hash
[h
];
124 hlist_for_each_entry_rcu(tb
, head
, tb_hlist
) {
125 if (tb
->tb_id
== id
) {
133 #endif /* CONFIG_IP_MULTIPLE_TABLES */
135 static void fib_flush(struct net
*net
)
138 struct fib_table
*tb
;
139 struct hlist_head
*head
;
142 for (h
= 0; h
< FIB_TABLE_HASHSZ
; h
++) {
143 head
= &net
->ipv4
.fib_table_hash
[h
];
144 hlist_for_each_entry(tb
, head
, tb_hlist
)
145 flushed
+= fib_table_flush(tb
);
153 * Find address type as if only "dev" was present in the system. If
154 * on_dev is NULL then all interfaces are taken into consideration.
156 static inline unsigned int __inet_dev_addr_type(struct net
*net
,
157 const struct net_device
*dev
,
160 struct flowi4 fl4
= { .daddr
= addr
};
161 struct fib_result res
;
162 unsigned int ret
= RTN_BROADCAST
;
163 struct fib_table
*local_table
;
165 if (ipv4_is_zeronet(addr
) || ipv4_is_lbcast(addr
))
166 return RTN_BROADCAST
;
167 if (ipv4_is_multicast(addr
))
168 return RTN_MULTICAST
;
170 local_table
= fib_get_table(net
, RT_TABLE_LOCAL
);
174 if (!fib_table_lookup(local_table
, &fl4
, &res
, FIB_LOOKUP_NOREF
)) {
175 if (!dev
|| dev
== res
.fi
->fib_dev
)
183 unsigned int inet_addr_type(struct net
*net
, __be32 addr
)
185 return __inet_dev_addr_type(net
, NULL
, addr
);
187 EXPORT_SYMBOL(inet_addr_type
);
189 unsigned int inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
,
192 return __inet_dev_addr_type(net
, dev
, addr
);
194 EXPORT_SYMBOL(inet_dev_addr_type
);
196 __be32
fib_compute_spec_dst(struct sk_buff
*skb
)
198 struct net_device
*dev
= skb
->dev
;
199 struct in_device
*in_dev
;
200 struct fib_result res
;
206 rt
= skb_rtable(skb
);
207 if ((rt
->rt_flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
| RTCF_LOCAL
)) ==
209 return ip_hdr(skb
)->daddr
;
211 in_dev
= __in_dev_get_rcu(dev
);
216 scope
= RT_SCOPE_UNIVERSE
;
217 if (!ipv4_is_zeronet(ip_hdr(skb
)->saddr
)) {
219 fl4
.flowi4_iif
= LOOPBACK_IFINDEX
;
220 fl4
.daddr
= ip_hdr(skb
)->saddr
;
222 fl4
.flowi4_tos
= RT_TOS(ip_hdr(skb
)->tos
);
223 fl4
.flowi4_scope
= scope
;
224 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(in_dev
) ? skb
->mark
: 0;
225 if (!fib_lookup(net
, &fl4
, &res
))
226 return FIB_RES_PREFSRC(net
, res
);
228 scope
= RT_SCOPE_LINK
;
231 return inet_select_addr(dev
, ip_hdr(skb
)->saddr
, scope
);
234 /* Given (packet source, input interface) and optional (dst, oif, tos):
235 * - (main) check, that source is valid i.e. not broadcast or our local
237 * - figure out what "logical" interface this packet arrived
238 * and calculate "specific destination" address.
239 * - check, that packet arrived from expected physical interface.
240 * called with rcu_read_lock()
242 static int __fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
243 u8 tos
, int oif
, struct net_device
*dev
,
244 int rpf
, struct in_device
*idev
, u32
*itag
)
247 struct fib_result res
;
253 fl4
.flowi4_iif
= oif
? : LOOPBACK_IFINDEX
;
256 fl4
.flowi4_tos
= tos
;
257 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
259 no_addr
= idev
->ifa_list
== NULL
;
261 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(idev
) ? skb
->mark
: 0;
264 if (fib_lookup(net
, &fl4
, &res
))
266 if (res
.type
!= RTN_UNICAST
&&
267 (res
.type
!= RTN_LOCAL
|| !IN_DEV_ACCEPT_LOCAL(idev
)))
269 if (!rpf
&& !fib_num_tclassid_users(dev_net(dev
)) &&
270 (dev
->ifindex
!= oif
|| !IN_DEV_TX_REDIRECTS(idev
)))
272 fib_combine_itag(itag
, &res
);
275 #ifdef CONFIG_IP_ROUTE_MULTIPATH
276 for (ret
= 0; ret
< res
.fi
->fib_nhs
; ret
++) {
277 struct fib_nh
*nh
= &res
.fi
->fib_nh
[ret
];
279 if (nh
->nh_dev
== dev
) {
285 if (FIB_RES_DEV(res
) == dev
)
289 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
296 fl4
.flowi4_oif
= dev
->ifindex
;
299 if (fib_lookup(net
, &fl4
, &res
) == 0) {
300 if (res
.type
== RTN_UNICAST
)
301 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
317 /* Ignore rp_filter for packets protected by IPsec. */
318 int fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
319 u8 tos
, int oif
, struct net_device
*dev
,
320 struct in_device
*idev
, u32
*itag
)
322 int r
= secpath_exists(skb
) ? 0 : IN_DEV_RPFILTER(idev
);
324 if (!r
&& !fib_num_tclassid_users(dev_net(dev
)) &&
325 IN_DEV_ACCEPT_LOCAL(idev
) &&
326 (dev
->ifindex
!= oif
|| !IN_DEV_TX_REDIRECTS(idev
))) {
330 return __fib_validate_source(skb
, src
, dst
, tos
, oif
, dev
, r
, idev
, itag
);
333 static inline __be32
sk_extract_addr(struct sockaddr
*addr
)
335 return ((struct sockaddr_in
*) addr
)->sin_addr
.s_addr
;
338 static int put_rtax(struct nlattr
*mx
, int len
, int type
, u32 value
)
342 nla
= (struct nlattr
*) ((char *) mx
+ len
);
343 nla
->nla_type
= type
;
344 nla
->nla_len
= nla_attr_size(4);
345 *(u32
*) nla_data(nla
) = value
;
347 return len
+ nla_total_size(4);
350 static int rtentry_to_fib_config(struct net
*net
, int cmd
, struct rtentry
*rt
,
351 struct fib_config
*cfg
)
356 memset(cfg
, 0, sizeof(*cfg
));
357 cfg
->fc_nlinfo
.nl_net
= net
;
359 if (rt
->rt_dst
.sa_family
!= AF_INET
)
360 return -EAFNOSUPPORT
;
363 * Check mask for validity:
364 * a) it must be contiguous.
365 * b) destination must have all host bits clear.
366 * c) if application forgot to set correct family (AF_INET),
367 * reject request unless it is absolutely clear i.e.
368 * both family and mask are zero.
371 addr
= sk_extract_addr(&rt
->rt_dst
);
372 if (!(rt
->rt_flags
& RTF_HOST
)) {
373 __be32 mask
= sk_extract_addr(&rt
->rt_genmask
);
375 if (rt
->rt_genmask
.sa_family
!= AF_INET
) {
376 if (mask
|| rt
->rt_genmask
.sa_family
)
377 return -EAFNOSUPPORT
;
380 if (bad_mask(mask
, addr
))
383 plen
= inet_mask_len(mask
);
386 cfg
->fc_dst_len
= plen
;
389 if (cmd
!= SIOCDELRT
) {
390 cfg
->fc_nlflags
= NLM_F_CREATE
;
391 cfg
->fc_protocol
= RTPROT_BOOT
;
395 cfg
->fc_priority
= rt
->rt_metric
- 1;
397 if (rt
->rt_flags
& RTF_REJECT
) {
398 cfg
->fc_scope
= RT_SCOPE_HOST
;
399 cfg
->fc_type
= RTN_UNREACHABLE
;
403 cfg
->fc_scope
= RT_SCOPE_NOWHERE
;
404 cfg
->fc_type
= RTN_UNICAST
;
408 struct net_device
*dev
;
409 char devname
[IFNAMSIZ
];
411 if (copy_from_user(devname
, rt
->rt_dev
, IFNAMSIZ
-1))
414 devname
[IFNAMSIZ
-1] = 0;
415 colon
= strchr(devname
, ':');
418 dev
= __dev_get_by_name(net
, devname
);
421 cfg
->fc_oif
= dev
->ifindex
;
423 struct in_ifaddr
*ifa
;
424 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
428 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
)
429 if (strcmp(ifa
->ifa_label
, devname
) == 0)
433 cfg
->fc_prefsrc
= ifa
->ifa_local
;
437 addr
= sk_extract_addr(&rt
->rt_gateway
);
438 if (rt
->rt_gateway
.sa_family
== AF_INET
&& addr
) {
440 if (rt
->rt_flags
& RTF_GATEWAY
&&
441 inet_addr_type(net
, addr
) == RTN_UNICAST
)
442 cfg
->fc_scope
= RT_SCOPE_UNIVERSE
;
445 if (cmd
== SIOCDELRT
)
448 if (rt
->rt_flags
& RTF_GATEWAY
&& !cfg
->fc_gw
)
451 if (cfg
->fc_scope
== RT_SCOPE_NOWHERE
)
452 cfg
->fc_scope
= RT_SCOPE_LINK
;
454 if (rt
->rt_flags
& (RTF_MTU
| RTF_WINDOW
| RTF_IRTT
)) {
458 mx
= kzalloc(3 * nla_total_size(4), GFP_KERNEL
);
462 if (rt
->rt_flags
& RTF_MTU
)
463 len
= put_rtax(mx
, len
, RTAX_ADVMSS
, rt
->rt_mtu
- 40);
465 if (rt
->rt_flags
& RTF_WINDOW
)
466 len
= put_rtax(mx
, len
, RTAX_WINDOW
, rt
->rt_window
);
468 if (rt
->rt_flags
& RTF_IRTT
)
469 len
= put_rtax(mx
, len
, RTAX_RTT
, rt
->rt_irtt
<< 3);
472 cfg
->fc_mx_len
= len
;
479 * Handle IP routing ioctl calls.
480 * These are used to manipulate the routing tables
482 int ip_rt_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
484 struct fib_config cfg
;
489 case SIOCADDRT
: /* Add a route */
490 case SIOCDELRT
: /* Delete a route */
491 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
494 if (copy_from_user(&rt
, arg
, sizeof(rt
)))
498 err
= rtentry_to_fib_config(net
, cmd
, &rt
, &cfg
);
500 struct fib_table
*tb
;
502 if (cmd
== SIOCDELRT
) {
503 tb
= fib_get_table(net
, cfg
.fc_table
);
505 err
= fib_table_delete(tb
, &cfg
);
509 tb
= fib_new_table(net
, cfg
.fc_table
);
511 err
= fib_table_insert(tb
, &cfg
);
516 /* allocated by rtentry_to_fib_config() */
525 const struct nla_policy rtm_ipv4_policy
[RTA_MAX
+ 1] = {
526 [RTA_DST
] = { .type
= NLA_U32
},
527 [RTA_SRC
] = { .type
= NLA_U32
},
528 [RTA_IIF
] = { .type
= NLA_U32
},
529 [RTA_OIF
] = { .type
= NLA_U32
},
530 [RTA_GATEWAY
] = { .type
= NLA_U32
},
531 [RTA_PRIORITY
] = { .type
= NLA_U32
},
532 [RTA_PREFSRC
] = { .type
= NLA_U32
},
533 [RTA_METRICS
] = { .type
= NLA_NESTED
},
534 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
535 [RTA_FLOW
] = { .type
= NLA_U32
},
538 static int rtm_to_fib_config(struct net
*net
, struct sk_buff
*skb
,
539 struct nlmsghdr
*nlh
, struct fib_config
*cfg
)
545 err
= nlmsg_validate(nlh
, sizeof(*rtm
), RTA_MAX
, rtm_ipv4_policy
);
549 memset(cfg
, 0, sizeof(*cfg
));
551 rtm
= nlmsg_data(nlh
);
552 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
553 cfg
->fc_tos
= rtm
->rtm_tos
;
554 cfg
->fc_table
= rtm
->rtm_table
;
555 cfg
->fc_protocol
= rtm
->rtm_protocol
;
556 cfg
->fc_scope
= rtm
->rtm_scope
;
557 cfg
->fc_type
= rtm
->rtm_type
;
558 cfg
->fc_flags
= rtm
->rtm_flags
;
559 cfg
->fc_nlflags
= nlh
->nlmsg_flags
;
561 cfg
->fc_nlinfo
.portid
= NETLINK_CB(skb
).portid
;
562 cfg
->fc_nlinfo
.nlh
= nlh
;
563 cfg
->fc_nlinfo
.nl_net
= net
;
565 if (cfg
->fc_type
> RTN_MAX
) {
570 nlmsg_for_each_attr(attr
, nlh
, sizeof(struct rtmsg
), remaining
) {
571 switch (nla_type(attr
)) {
573 cfg
->fc_dst
= nla_get_be32(attr
);
576 cfg
->fc_oif
= nla_get_u32(attr
);
579 cfg
->fc_gw
= nla_get_be32(attr
);
582 cfg
->fc_priority
= nla_get_u32(attr
);
585 cfg
->fc_prefsrc
= nla_get_be32(attr
);
588 cfg
->fc_mx
= nla_data(attr
);
589 cfg
->fc_mx_len
= nla_len(attr
);
592 cfg
->fc_mp
= nla_data(attr
);
593 cfg
->fc_mp_len
= nla_len(attr
);
596 cfg
->fc_flow
= nla_get_u32(attr
);
599 cfg
->fc_table
= nla_get_u32(attr
);
609 static int inet_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
611 struct net
*net
= sock_net(skb
->sk
);
612 struct fib_config cfg
;
613 struct fib_table
*tb
;
616 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
620 tb
= fib_get_table(net
, cfg
.fc_table
);
626 err
= fib_table_delete(tb
, &cfg
);
631 static int inet_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
633 struct net
*net
= sock_net(skb
->sk
);
634 struct fib_config cfg
;
635 struct fib_table
*tb
;
638 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
642 tb
= fib_new_table(net
, cfg
.fc_table
);
648 err
= fib_table_insert(tb
, &cfg
);
653 static int inet_dump_fib(struct sk_buff
*skb
, struct netlink_callback
*cb
)
655 struct net
*net
= sock_net(skb
->sk
);
657 unsigned int e
= 0, s_e
;
658 struct fib_table
*tb
;
659 struct hlist_head
*head
;
662 if (nlmsg_len(cb
->nlh
) >= sizeof(struct rtmsg
) &&
663 ((struct rtmsg
*) nlmsg_data(cb
->nlh
))->rtm_flags
& RTM_F_CLONED
)
669 for (h
= s_h
; h
< FIB_TABLE_HASHSZ
; h
++, s_e
= 0) {
671 head
= &net
->ipv4
.fib_table_hash
[h
];
672 hlist_for_each_entry(tb
, head
, tb_hlist
) {
676 memset(&cb
->args
[2], 0, sizeof(cb
->args
) -
677 2 * sizeof(cb
->args
[0]));
678 if (fib_table_dump(tb
, skb
, cb
) < 0)
692 /* Prepare and feed intra-kernel routing request.
693 * Really, it should be netlink message, but :-( netlink
694 * can be not configured, so that we feed it directly
695 * to fib engine. It is legal, because all events occur
696 * only when netlink is already locked.
698 static void fib_magic(int cmd
, int type
, __be32 dst
, int dst_len
, struct in_ifaddr
*ifa
)
700 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
701 struct fib_table
*tb
;
702 struct fib_config cfg
= {
703 .fc_protocol
= RTPROT_KERNEL
,
706 .fc_dst_len
= dst_len
,
707 .fc_prefsrc
= ifa
->ifa_local
,
708 .fc_oif
= ifa
->ifa_dev
->dev
->ifindex
,
709 .fc_nlflags
= NLM_F_CREATE
| NLM_F_APPEND
,
715 if (type
== RTN_UNICAST
)
716 tb
= fib_new_table(net
, RT_TABLE_MAIN
);
718 tb
= fib_new_table(net
, RT_TABLE_LOCAL
);
723 cfg
.fc_table
= tb
->tb_id
;
725 if (type
!= RTN_LOCAL
)
726 cfg
.fc_scope
= RT_SCOPE_LINK
;
728 cfg
.fc_scope
= RT_SCOPE_HOST
;
730 if (cmd
== RTM_NEWROUTE
)
731 fib_table_insert(tb
, &cfg
);
733 fib_table_delete(tb
, &cfg
);
736 void fib_add_ifaddr(struct in_ifaddr
*ifa
)
738 struct in_device
*in_dev
= ifa
->ifa_dev
;
739 struct net_device
*dev
= in_dev
->dev
;
740 struct in_ifaddr
*prim
= ifa
;
741 __be32 mask
= ifa
->ifa_mask
;
742 __be32 addr
= ifa
->ifa_local
;
743 __be32 prefix
= ifa
->ifa_address
& mask
;
745 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
746 prim
= inet_ifa_byprefix(in_dev
, prefix
, mask
);
748 pr_warn("%s: bug: prim == NULL\n", __func__
);
753 fib_magic(RTM_NEWROUTE
, RTN_LOCAL
, addr
, 32, prim
);
755 if (!(dev
->flags
& IFF_UP
))
758 /* Add broadcast address, if it is explicitly assigned. */
759 if (ifa
->ifa_broadcast
&& ifa
->ifa_broadcast
!= htonl(0xFFFFFFFF))
760 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
762 if (!ipv4_is_zeronet(prefix
) && !(ifa
->ifa_flags
& IFA_F_SECONDARY
) &&
763 (prefix
!= addr
|| ifa
->ifa_prefixlen
< 32)) {
764 fib_magic(RTM_NEWROUTE
,
765 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
766 prefix
, ifa
->ifa_prefixlen
, prim
);
768 /* Add network specific broadcasts, when it takes a sense */
769 if (ifa
->ifa_prefixlen
< 31) {
770 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
, 32, prim
);
771 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
| ~mask
,
777 /* Delete primary or secondary address.
778 * Optionally, on secondary address promotion consider the addresses
779 * from subnet iprim as deleted, even if they are in device list.
780 * In this case the secondary ifa can be in device list.
782 void fib_del_ifaddr(struct in_ifaddr
*ifa
, struct in_ifaddr
*iprim
)
784 struct in_device
*in_dev
= ifa
->ifa_dev
;
785 struct net_device
*dev
= in_dev
->dev
;
786 struct in_ifaddr
*ifa1
;
787 struct in_ifaddr
*prim
= ifa
, *prim1
= NULL
;
788 __be32 brd
= ifa
->ifa_address
| ~ifa
->ifa_mask
;
789 __be32 any
= ifa
->ifa_address
& ifa
->ifa_mask
;
795 int subnet
= 0; /* Primary network */
796 int gone
= 1; /* Address is missing */
797 int same_prefsrc
= 0; /* Another primary with same IP */
799 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
800 prim
= inet_ifa_byprefix(in_dev
, any
, ifa
->ifa_mask
);
802 pr_warn("%s: bug: prim == NULL\n", __func__
);
805 if (iprim
&& iprim
!= prim
) {
806 pr_warn("%s: bug: iprim != prim\n", __func__
);
809 } else if (!ipv4_is_zeronet(any
) &&
810 (any
!= ifa
->ifa_local
|| ifa
->ifa_prefixlen
< 32)) {
811 fib_magic(RTM_DELROUTE
,
812 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
813 any
, ifa
->ifa_prefixlen
, prim
);
817 /* Deletion is more complicated than add.
818 * We should take care of not to delete too much :-)
820 * Scan address list to be sure that addresses are really gone.
823 for (ifa1
= in_dev
->ifa_list
; ifa1
; ifa1
= ifa1
->ifa_next
) {
825 /* promotion, keep the IP */
829 /* Ignore IFAs from our subnet */
830 if (iprim
&& ifa1
->ifa_mask
== iprim
->ifa_mask
&&
831 inet_ifa_match(ifa1
->ifa_address
, iprim
))
834 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
835 if (ifa1
->ifa_flags
& IFA_F_SECONDARY
) {
836 /* Another address from our subnet? */
837 if (ifa1
->ifa_mask
== prim
->ifa_mask
&&
838 inet_ifa_match(ifa1
->ifa_address
, prim
))
841 /* We reached the secondaries, so
842 * same_prefsrc should be determined.
846 /* Search new prim1 if ifa1 is not
847 * using the current prim1
850 ifa1
->ifa_mask
!= prim1
->ifa_mask
||
851 !inet_ifa_match(ifa1
->ifa_address
, prim1
))
852 prim1
= inet_ifa_byprefix(in_dev
,
857 if (prim1
->ifa_local
!= prim
->ifa_local
)
861 if (prim
->ifa_local
!= ifa1
->ifa_local
)
867 if (ifa
->ifa_local
== ifa1
->ifa_local
)
869 if (ifa
->ifa_broadcast
== ifa1
->ifa_broadcast
)
871 if (brd
== ifa1
->ifa_broadcast
)
873 if (any
== ifa1
->ifa_broadcast
)
875 /* primary has network specific broadcasts */
876 if (prim1
== ifa1
&& ifa1
->ifa_prefixlen
< 31) {
877 __be32 brd1
= ifa1
->ifa_address
| ~ifa1
->ifa_mask
;
878 __be32 any1
= ifa1
->ifa_address
& ifa1
->ifa_mask
;
880 if (!ipv4_is_zeronet(any1
)) {
881 if (ifa
->ifa_broadcast
== brd1
||
882 ifa
->ifa_broadcast
== any1
)
884 if (brd
== brd1
|| brd
== any1
)
886 if (any
== brd1
|| any
== any1
)
893 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
894 if (subnet
&& ifa
->ifa_prefixlen
< 31) {
896 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, brd
, 32, prim
);
898 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, any
, 32, prim
);
900 if (!(ok
& LOCAL_OK
)) {
901 fib_magic(RTM_DELROUTE
, RTN_LOCAL
, ifa
->ifa_local
, 32, prim
);
903 /* Check, that this local address finally disappeared. */
905 inet_addr_type(dev_net(dev
), ifa
->ifa_local
) != RTN_LOCAL
) {
906 /* And the last, but not the least thing.
907 * We must flush stray FIB entries.
909 * First of all, we scan fib_info list searching
910 * for stray nexthop entries, then ignite fib_flush.
912 if (fib_sync_down_addr(dev_net(dev
), ifa
->ifa_local
))
913 fib_flush(dev_net(dev
));
922 static void nl_fib_lookup(struct fib_result_nl
*frn
, struct fib_table
*tb
)
925 struct fib_result res
;
926 struct flowi4 fl4
= {
927 .flowi4_mark
= frn
->fl_mark
,
928 .daddr
= frn
->fl_addr
,
929 .flowi4_tos
= frn
->fl_tos
,
930 .flowi4_scope
= frn
->fl_scope
,
937 frn
->tb_id
= tb
->tb_id
;
938 frn
->err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
941 frn
->prefixlen
= res
.prefixlen
;
942 frn
->nh_sel
= res
.nh_sel
;
943 frn
->type
= res
.type
;
944 frn
->scope
= res
.scope
;
950 static void nl_fib_input(struct sk_buff
*skb
)
953 struct fib_result_nl
*frn
;
954 struct nlmsghdr
*nlh
;
955 struct fib_table
*tb
;
958 net
= sock_net(skb
->sk
);
959 nlh
= nlmsg_hdr(skb
);
960 if (skb
->len
< NLMSG_HDRLEN
|| skb
->len
< nlh
->nlmsg_len
||
961 nlmsg_len(nlh
) < sizeof(*frn
))
964 skb
= netlink_skb_clone(skb
, GFP_KERNEL
);
967 nlh
= nlmsg_hdr(skb
);
969 frn
= (struct fib_result_nl
*) nlmsg_data(nlh
);
970 tb
= fib_get_table(net
, frn
->tb_id_in
);
972 nl_fib_lookup(frn
, tb
);
974 portid
= NETLINK_CB(skb
).portid
; /* netlink portid */
975 NETLINK_CB(skb
).portid
= 0; /* from kernel */
976 NETLINK_CB(skb
).dst_group
= 0; /* unicast */
977 netlink_unicast(net
->ipv4
.fibnl
, skb
, portid
, MSG_DONTWAIT
);
980 static int __net_init
nl_fib_lookup_init(struct net
*net
)
983 struct netlink_kernel_cfg cfg
= {
984 .input
= nl_fib_input
,
987 sk
= netlink_kernel_create(net
, NETLINK_FIB_LOOKUP
, &cfg
);
989 return -EAFNOSUPPORT
;
990 net
->ipv4
.fibnl
= sk
;
994 static void nl_fib_lookup_exit(struct net
*net
)
996 netlink_kernel_release(net
->ipv4
.fibnl
);
997 net
->ipv4
.fibnl
= NULL
;
1000 static void fib_disable_ip(struct net_device
*dev
, int force
)
1002 if (fib_sync_down_dev(dev
, force
))
1003 fib_flush(dev_net(dev
));
1004 rt_cache_flush(dev_net(dev
));
1008 static int fib_inetaddr_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1010 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
1011 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
1012 struct net
*net
= dev_net(dev
);
1016 fib_add_ifaddr(ifa
);
1017 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1020 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1021 rt_cache_flush(dev_net(dev
));
1024 fib_del_ifaddr(ifa
, NULL
);
1025 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1026 if (ifa
->ifa_dev
->ifa_list
== NULL
) {
1027 /* Last address was deleted from this interface.
1030 fib_disable_ip(dev
, 1);
1032 rt_cache_flush(dev_net(dev
));
1039 static int fib_netdev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1041 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1042 struct in_device
*in_dev
;
1043 struct net
*net
= dev_net(dev
);
1045 if (event
== NETDEV_UNREGISTER
) {
1046 fib_disable_ip(dev
, 2);
1051 in_dev
= __in_dev_get_rtnl(dev
);
1058 fib_add_ifaddr(ifa
);
1059 } endfor_ifa(in_dev
);
1060 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1063 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1064 rt_cache_flush(net
);
1067 fib_disable_ip(dev
, 0);
1069 case NETDEV_CHANGEMTU
:
1071 rt_cache_flush(net
);
1077 static struct notifier_block fib_inetaddr_notifier
= {
1078 .notifier_call
= fib_inetaddr_event
,
1081 static struct notifier_block fib_netdev_notifier
= {
1082 .notifier_call
= fib_netdev_event
,
1085 static int __net_init
ip_fib_net_init(struct net
*net
)
1088 size_t size
= sizeof(struct hlist_head
) * FIB_TABLE_HASHSZ
;
1090 /* Avoid false sharing : Use at least a full cache line */
1091 size
= max_t(size_t, size
, L1_CACHE_BYTES
);
1093 net
->ipv4
.fib_table_hash
= kzalloc(size
, GFP_KERNEL
);
1094 if (net
->ipv4
.fib_table_hash
== NULL
)
1097 err
= fib4_rules_init(net
);
1103 kfree(net
->ipv4
.fib_table_hash
);
1107 static void ip_fib_net_exit(struct net
*net
)
1111 #ifdef CONFIG_IP_MULTIPLE_TABLES
1112 fib4_rules_exit(net
);
1116 for (i
= 0; i
< FIB_TABLE_HASHSZ
; i
++) {
1117 struct fib_table
*tb
;
1118 struct hlist_head
*head
;
1119 struct hlist_node
*tmp
;
1121 head
= &net
->ipv4
.fib_table_hash
[i
];
1122 hlist_for_each_entry_safe(tb
, tmp
, head
, tb_hlist
) {
1123 hlist_del(&tb
->tb_hlist
);
1124 fib_table_flush(tb
);
1129 kfree(net
->ipv4
.fib_table_hash
);
1132 static int __net_init
fib_net_init(struct net
*net
)
1136 #ifdef CONFIG_IP_ROUTE_CLASSID
1137 net
->ipv4
.fib_num_tclassid_users
= 0;
1139 error
= ip_fib_net_init(net
);
1142 error
= nl_fib_lookup_init(net
);
1145 error
= fib_proc_init(net
);
1152 nl_fib_lookup_exit(net
);
1154 ip_fib_net_exit(net
);
1158 static void __net_exit
fib_net_exit(struct net
*net
)
1161 nl_fib_lookup_exit(net
);
1162 ip_fib_net_exit(net
);
1165 static struct pernet_operations fib_net_ops
= {
1166 .init
= fib_net_init
,
1167 .exit
= fib_net_exit
,
1170 void __init
ip_fib_init(void)
1172 rtnl_register(PF_INET
, RTM_NEWROUTE
, inet_rtm_newroute
, NULL
, NULL
);
1173 rtnl_register(PF_INET
, RTM_DELROUTE
, inet_rtm_delroute
, NULL
, NULL
);
1174 rtnl_register(PF_INET
, RTM_GETROUTE
, NULL
, inet_dump_fib
, NULL
);
1176 register_pernet_subsys(&fib_net_ops
);
1177 register_netdevice_notifier(&fib_netdev_notifier
);
1178 register_inetaddr_notifier(&fib_inetaddr_notifier
);