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/init.h>
35 #include <linux/list.h>
36 #include <linux/slab.h>
39 #include <net/protocol.h>
40 #include <net/route.h>
44 #include <net/ip_fib.h>
45 #include <net/rtnetlink.h>
48 #ifndef CONFIG_IP_MULTIPLE_TABLES
50 static int __net_init
fib4_rules_init(struct net
*net
)
52 struct fib_table
*local_table
, *main_table
;
54 local_table
= fib_trie_table(RT_TABLE_LOCAL
);
55 if (local_table
== NULL
)
58 main_table
= fib_trie_table(RT_TABLE_MAIN
);
59 if (main_table
== NULL
)
62 hlist_add_head_rcu(&local_table
->tb_hlist
,
63 &net
->ipv4
.fib_table_hash
[TABLE_LOCAL_INDEX
]);
64 hlist_add_head_rcu(&main_table
->tb_hlist
,
65 &net
->ipv4
.fib_table_hash
[TABLE_MAIN_INDEX
]);
74 struct fib_table
*fib_new_table(struct net
*net
, u32 id
)
81 tb
= fib_get_table(net
, id
);
85 tb
= fib_trie_table(id
);
88 h
= id
& (FIB_TABLE_HASHSZ
- 1);
89 hlist_add_head_rcu(&tb
->tb_hlist
, &net
->ipv4
.fib_table_hash
[h
]);
93 struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
96 struct hlist_node
*node
;
97 struct hlist_head
*head
;
102 h
= id
& (FIB_TABLE_HASHSZ
- 1);
105 head
= &net
->ipv4
.fib_table_hash
[h
];
106 hlist_for_each_entry_rcu(tb
, node
, head
, tb_hlist
) {
107 if (tb
->tb_id
== id
) {
115 #endif /* CONFIG_IP_MULTIPLE_TABLES */
117 static void fib_flush(struct net
*net
)
120 struct fib_table
*tb
;
121 struct hlist_node
*node
;
122 struct hlist_head
*head
;
125 for (h
= 0; h
< FIB_TABLE_HASHSZ
; h
++) {
126 head
= &net
->ipv4
.fib_table_hash
[h
];
127 hlist_for_each_entry(tb
, node
, head
, tb_hlist
)
128 flushed
+= fib_table_flush(tb
);
132 rt_cache_flush(net
, -1);
136 * Find address type as if only "dev" was present in the system. If
137 * on_dev is NULL then all interfaces are taken into consideration.
139 static inline unsigned __inet_dev_addr_type(struct net
*net
,
140 const struct net_device
*dev
,
143 struct flowi4 fl4
= { .daddr
= addr
};
144 struct fib_result res
;
145 unsigned ret
= RTN_BROADCAST
;
146 struct fib_table
*local_table
;
148 if (ipv4_is_zeronet(addr
) || ipv4_is_lbcast(addr
))
149 return RTN_BROADCAST
;
150 if (ipv4_is_multicast(addr
))
151 return RTN_MULTICAST
;
153 #ifdef CONFIG_IP_MULTIPLE_TABLES
157 local_table
= fib_get_table(net
, RT_TABLE_LOCAL
);
161 if (!fib_table_lookup(local_table
, &fl4
, &res
, FIB_LOOKUP_NOREF
)) {
162 if (!dev
|| dev
== res
.fi
->fib_dev
)
170 unsigned int inet_addr_type(struct net
*net
, __be32 addr
)
172 return __inet_dev_addr_type(net
, NULL
, addr
);
174 EXPORT_SYMBOL(inet_addr_type
);
176 unsigned int inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
,
179 return __inet_dev_addr_type(net
, dev
, addr
);
181 EXPORT_SYMBOL(inet_dev_addr_type
);
183 /* Given (packet source, input interface) and optional (dst, oif, tos):
184 * - (main) check, that source is valid i.e. not broadcast or our local
186 * - figure out what "logical" interface this packet arrived
187 * and calculate "specific destination" address.
188 * - check, that packet arrived from expected physical interface.
189 * called with rcu_read_lock()
191 int fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
, u8 tos
,
192 int oif
, struct net_device
*dev
, __be32
*spec_dst
,
195 struct in_device
*in_dev
;
197 struct fib_result res
;
198 int no_addr
, rpf
, accept_local
;
204 fl4
.flowi4_iif
= oif
;
207 fl4
.flowi4_tos
= tos
;
208 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
210 no_addr
= rpf
= accept_local
= 0;
211 in_dev
= __in_dev_get_rcu(dev
);
213 no_addr
= in_dev
->ifa_list
== NULL
;
215 /* Ignore rp_filter for packets protected by IPsec. */
216 rpf
= secpath_exists(skb
) ? 0 : IN_DEV_RPFILTER(in_dev
);
218 accept_local
= IN_DEV_ACCEPT_LOCAL(in_dev
);
219 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(in_dev
) ? skb
->mark
: 0;
226 if (fib_lookup(net
, &fl4
, &res
))
228 if (res
.type
!= RTN_UNICAST
) {
229 if (res
.type
!= RTN_LOCAL
|| !accept_local
)
232 *spec_dst
= FIB_RES_PREFSRC(net
, res
);
233 fib_combine_itag(itag
, &res
);
236 #ifdef CONFIG_IP_ROUTE_MULTIPATH
237 for (ret
= 0; ret
< res
.fi
->fib_nhs
; ret
++) {
238 struct fib_nh
*nh
= &res
.fi
->fib_nh
[ret
];
240 if (nh
->nh_dev
== dev
) {
246 if (FIB_RES_DEV(res
) == dev
)
250 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
257 fl4
.flowi4_oif
= dev
->ifindex
;
260 if (fib_lookup(net
, &fl4
, &res
) == 0) {
261 if (res
.type
== RTN_UNICAST
) {
262 *spec_dst
= FIB_RES_PREFSRC(net
, res
);
263 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
271 *spec_dst
= inet_select_addr(dev
, 0, RT_SCOPE_UNIVERSE
);
281 static inline __be32
sk_extract_addr(struct sockaddr
*addr
)
283 return ((struct sockaddr_in
*) addr
)->sin_addr
.s_addr
;
286 static int put_rtax(struct nlattr
*mx
, int len
, int type
, u32 value
)
290 nla
= (struct nlattr
*) ((char *) mx
+ len
);
291 nla
->nla_type
= type
;
292 nla
->nla_len
= nla_attr_size(4);
293 *(u32
*) nla_data(nla
) = value
;
295 return len
+ nla_total_size(4);
298 static int rtentry_to_fib_config(struct net
*net
, int cmd
, struct rtentry
*rt
,
299 struct fib_config
*cfg
)
304 memset(cfg
, 0, sizeof(*cfg
));
305 cfg
->fc_nlinfo
.nl_net
= net
;
307 if (rt
->rt_dst
.sa_family
!= AF_INET
)
308 return -EAFNOSUPPORT
;
311 * Check mask for validity:
312 * a) it must be contiguous.
313 * b) destination must have all host bits clear.
314 * c) if application forgot to set correct family (AF_INET),
315 * reject request unless it is absolutely clear i.e.
316 * both family and mask are zero.
319 addr
= sk_extract_addr(&rt
->rt_dst
);
320 if (!(rt
->rt_flags
& RTF_HOST
)) {
321 __be32 mask
= sk_extract_addr(&rt
->rt_genmask
);
323 if (rt
->rt_genmask
.sa_family
!= AF_INET
) {
324 if (mask
|| rt
->rt_genmask
.sa_family
)
325 return -EAFNOSUPPORT
;
328 if (bad_mask(mask
, addr
))
331 plen
= inet_mask_len(mask
);
334 cfg
->fc_dst_len
= plen
;
337 if (cmd
!= SIOCDELRT
) {
338 cfg
->fc_nlflags
= NLM_F_CREATE
;
339 cfg
->fc_protocol
= RTPROT_BOOT
;
343 cfg
->fc_priority
= rt
->rt_metric
- 1;
345 if (rt
->rt_flags
& RTF_REJECT
) {
346 cfg
->fc_scope
= RT_SCOPE_HOST
;
347 cfg
->fc_type
= RTN_UNREACHABLE
;
351 cfg
->fc_scope
= RT_SCOPE_NOWHERE
;
352 cfg
->fc_type
= RTN_UNICAST
;
356 struct net_device
*dev
;
357 char devname
[IFNAMSIZ
];
359 if (copy_from_user(devname
, rt
->rt_dev
, IFNAMSIZ
-1))
362 devname
[IFNAMSIZ
-1] = 0;
363 colon
= strchr(devname
, ':');
366 dev
= __dev_get_by_name(net
, devname
);
369 cfg
->fc_oif
= dev
->ifindex
;
371 struct in_ifaddr
*ifa
;
372 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
376 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
)
377 if (strcmp(ifa
->ifa_label
, devname
) == 0)
381 cfg
->fc_prefsrc
= ifa
->ifa_local
;
385 addr
= sk_extract_addr(&rt
->rt_gateway
);
386 if (rt
->rt_gateway
.sa_family
== AF_INET
&& addr
) {
388 if (rt
->rt_flags
& RTF_GATEWAY
&&
389 inet_addr_type(net
, addr
) == RTN_UNICAST
)
390 cfg
->fc_scope
= RT_SCOPE_UNIVERSE
;
393 if (cmd
== SIOCDELRT
)
396 if (rt
->rt_flags
& RTF_GATEWAY
&& !cfg
->fc_gw
)
399 if (cfg
->fc_scope
== RT_SCOPE_NOWHERE
)
400 cfg
->fc_scope
= RT_SCOPE_LINK
;
402 if (rt
->rt_flags
& (RTF_MTU
| RTF_WINDOW
| RTF_IRTT
)) {
406 mx
= kzalloc(3 * nla_total_size(4), GFP_KERNEL
);
410 if (rt
->rt_flags
& RTF_MTU
)
411 len
= put_rtax(mx
, len
, RTAX_ADVMSS
, rt
->rt_mtu
- 40);
413 if (rt
->rt_flags
& RTF_WINDOW
)
414 len
= put_rtax(mx
, len
, RTAX_WINDOW
, rt
->rt_window
);
416 if (rt
->rt_flags
& RTF_IRTT
)
417 len
= put_rtax(mx
, len
, RTAX_RTT
, rt
->rt_irtt
<< 3);
420 cfg
->fc_mx_len
= len
;
427 * Handle IP routing ioctl calls.
428 * These are used to manipulate the routing tables
430 int ip_rt_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
432 struct fib_config cfg
;
437 case SIOCADDRT
: /* Add a route */
438 case SIOCDELRT
: /* Delete a route */
439 if (!capable(CAP_NET_ADMIN
))
442 if (copy_from_user(&rt
, arg
, sizeof(rt
)))
446 err
= rtentry_to_fib_config(net
, cmd
, &rt
, &cfg
);
448 struct fib_table
*tb
;
450 if (cmd
== SIOCDELRT
) {
451 tb
= fib_get_table(net
, cfg
.fc_table
);
453 err
= fib_table_delete(tb
, &cfg
);
457 tb
= fib_new_table(net
, cfg
.fc_table
);
459 err
= fib_table_insert(tb
, &cfg
);
464 /* allocated by rtentry_to_fib_config() */
473 const struct nla_policy rtm_ipv4_policy
[RTA_MAX
+ 1] = {
474 [RTA_DST
] = { .type
= NLA_U32
},
475 [RTA_SRC
] = { .type
= NLA_U32
},
476 [RTA_IIF
] = { .type
= NLA_U32
},
477 [RTA_OIF
] = { .type
= NLA_U32
},
478 [RTA_GATEWAY
] = { .type
= NLA_U32
},
479 [RTA_PRIORITY
] = { .type
= NLA_U32
},
480 [RTA_PREFSRC
] = { .type
= NLA_U32
},
481 [RTA_METRICS
] = { .type
= NLA_NESTED
},
482 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
483 [RTA_FLOW
] = { .type
= NLA_U32
},
486 static int rtm_to_fib_config(struct net
*net
, struct sk_buff
*skb
,
487 struct nlmsghdr
*nlh
, struct fib_config
*cfg
)
493 err
= nlmsg_validate(nlh
, sizeof(*rtm
), RTA_MAX
, rtm_ipv4_policy
);
497 memset(cfg
, 0, sizeof(*cfg
));
499 rtm
= nlmsg_data(nlh
);
500 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
501 cfg
->fc_tos
= rtm
->rtm_tos
;
502 cfg
->fc_table
= rtm
->rtm_table
;
503 cfg
->fc_protocol
= rtm
->rtm_protocol
;
504 cfg
->fc_scope
= rtm
->rtm_scope
;
505 cfg
->fc_type
= rtm
->rtm_type
;
506 cfg
->fc_flags
= rtm
->rtm_flags
;
507 cfg
->fc_nlflags
= nlh
->nlmsg_flags
;
509 cfg
->fc_nlinfo
.pid
= NETLINK_CB(skb
).pid
;
510 cfg
->fc_nlinfo
.nlh
= nlh
;
511 cfg
->fc_nlinfo
.nl_net
= net
;
513 if (cfg
->fc_type
> RTN_MAX
) {
518 nlmsg_for_each_attr(attr
, nlh
, sizeof(struct rtmsg
), remaining
) {
519 switch (nla_type(attr
)) {
521 cfg
->fc_dst
= nla_get_be32(attr
);
524 cfg
->fc_oif
= nla_get_u32(attr
);
527 cfg
->fc_gw
= nla_get_be32(attr
);
530 cfg
->fc_priority
= nla_get_u32(attr
);
533 cfg
->fc_prefsrc
= nla_get_be32(attr
);
536 cfg
->fc_mx
= nla_data(attr
);
537 cfg
->fc_mx_len
= nla_len(attr
);
540 cfg
->fc_mp
= nla_data(attr
);
541 cfg
->fc_mp_len
= nla_len(attr
);
544 cfg
->fc_flow
= nla_get_u32(attr
);
547 cfg
->fc_table
= nla_get_u32(attr
);
557 static int inet_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
559 struct net
*net
= sock_net(skb
->sk
);
560 struct fib_config cfg
;
561 struct fib_table
*tb
;
564 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
568 tb
= fib_get_table(net
, cfg
.fc_table
);
574 err
= fib_table_delete(tb
, &cfg
);
579 static int inet_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
581 struct net
*net
= sock_net(skb
->sk
);
582 struct fib_config cfg
;
583 struct fib_table
*tb
;
586 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
590 tb
= fib_new_table(net
, cfg
.fc_table
);
596 err
= fib_table_insert(tb
, &cfg
);
601 static int inet_dump_fib(struct sk_buff
*skb
, struct netlink_callback
*cb
)
603 struct net
*net
= sock_net(skb
->sk
);
605 unsigned int e
= 0, s_e
;
606 struct fib_table
*tb
;
607 struct hlist_node
*node
;
608 struct hlist_head
*head
;
611 if (nlmsg_len(cb
->nlh
) >= sizeof(struct rtmsg
) &&
612 ((struct rtmsg
*) nlmsg_data(cb
->nlh
))->rtm_flags
& RTM_F_CLONED
)
613 return ip_rt_dump(skb
, cb
);
618 for (h
= s_h
; h
< FIB_TABLE_HASHSZ
; h
++, s_e
= 0) {
620 head
= &net
->ipv4
.fib_table_hash
[h
];
621 hlist_for_each_entry(tb
, node
, head
, tb_hlist
) {
625 memset(&cb
->args
[2], 0, sizeof(cb
->args
) -
626 2 * sizeof(cb
->args
[0]));
627 if (fib_table_dump(tb
, skb
, cb
) < 0)
641 /* Prepare and feed intra-kernel routing request.
642 * Really, it should be netlink message, but :-( netlink
643 * can be not configured, so that we feed it directly
644 * to fib engine. It is legal, because all events occur
645 * only when netlink is already locked.
647 static void fib_magic(int cmd
, int type
, __be32 dst
, int dst_len
, struct in_ifaddr
*ifa
)
649 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
650 struct fib_table
*tb
;
651 struct fib_config cfg
= {
652 .fc_protocol
= RTPROT_KERNEL
,
655 .fc_dst_len
= dst_len
,
656 .fc_prefsrc
= ifa
->ifa_local
,
657 .fc_oif
= ifa
->ifa_dev
->dev
->ifindex
,
658 .fc_nlflags
= NLM_F_CREATE
| NLM_F_APPEND
,
664 if (type
== RTN_UNICAST
)
665 tb
= fib_new_table(net
, RT_TABLE_MAIN
);
667 tb
= fib_new_table(net
, RT_TABLE_LOCAL
);
672 cfg
.fc_table
= tb
->tb_id
;
674 if (type
!= RTN_LOCAL
)
675 cfg
.fc_scope
= RT_SCOPE_LINK
;
677 cfg
.fc_scope
= RT_SCOPE_HOST
;
679 if (cmd
== RTM_NEWROUTE
)
680 fib_table_insert(tb
, &cfg
);
682 fib_table_delete(tb
, &cfg
);
685 void fib_add_ifaddr(struct in_ifaddr
*ifa
)
687 struct in_device
*in_dev
= ifa
->ifa_dev
;
688 struct net_device
*dev
= in_dev
->dev
;
689 struct in_ifaddr
*prim
= ifa
;
690 __be32 mask
= ifa
->ifa_mask
;
691 __be32 addr
= ifa
->ifa_local
;
692 __be32 prefix
= ifa
->ifa_address
& mask
;
694 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
695 prim
= inet_ifa_byprefix(in_dev
, prefix
, mask
);
697 pr_warn("%s: bug: prim == NULL\n", __func__
);
702 fib_magic(RTM_NEWROUTE
, RTN_LOCAL
, addr
, 32, prim
);
704 if (!(dev
->flags
& IFF_UP
))
707 /* Add broadcast address, if it is explicitly assigned. */
708 if (ifa
->ifa_broadcast
&& ifa
->ifa_broadcast
!= htonl(0xFFFFFFFF))
709 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
711 if (!ipv4_is_zeronet(prefix
) && !(ifa
->ifa_flags
& IFA_F_SECONDARY
) &&
712 (prefix
!= addr
|| ifa
->ifa_prefixlen
< 32)) {
713 fib_magic(RTM_NEWROUTE
,
714 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
715 prefix
, ifa
->ifa_prefixlen
, prim
);
717 /* Add network specific broadcasts, when it takes a sense */
718 if (ifa
->ifa_prefixlen
< 31) {
719 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
, 32, prim
);
720 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
| ~mask
,
726 /* Delete primary or secondary address.
727 * Optionally, on secondary address promotion consider the addresses
728 * from subnet iprim as deleted, even if they are in device list.
729 * In this case the secondary ifa can be in device list.
731 void fib_del_ifaddr(struct in_ifaddr
*ifa
, struct in_ifaddr
*iprim
)
733 struct in_device
*in_dev
= ifa
->ifa_dev
;
734 struct net_device
*dev
= in_dev
->dev
;
735 struct in_ifaddr
*ifa1
;
736 struct in_ifaddr
*prim
= ifa
, *prim1
= NULL
;
737 __be32 brd
= ifa
->ifa_address
| ~ifa
->ifa_mask
;
738 __be32 any
= ifa
->ifa_address
& ifa
->ifa_mask
;
744 int subnet
= 0; /* Primary network */
745 int gone
= 1; /* Address is missing */
746 int same_prefsrc
= 0; /* Another primary with same IP */
748 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
749 prim
= inet_ifa_byprefix(in_dev
, any
, ifa
->ifa_mask
);
751 pr_warn("%s: bug: prim == NULL\n", __func__
);
754 if (iprim
&& iprim
!= prim
) {
755 pr_warn("%s: bug: iprim != prim\n", __func__
);
758 } else if (!ipv4_is_zeronet(any
) &&
759 (any
!= ifa
->ifa_local
|| ifa
->ifa_prefixlen
< 32)) {
760 fib_magic(RTM_DELROUTE
,
761 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
762 any
, ifa
->ifa_prefixlen
, prim
);
766 /* Deletion is more complicated than add.
767 * We should take care of not to delete too much :-)
769 * Scan address list to be sure that addresses are really gone.
772 for (ifa1
= in_dev
->ifa_list
; ifa1
; ifa1
= ifa1
->ifa_next
) {
774 /* promotion, keep the IP */
778 /* Ignore IFAs from our subnet */
779 if (iprim
&& ifa1
->ifa_mask
== iprim
->ifa_mask
&&
780 inet_ifa_match(ifa1
->ifa_address
, iprim
))
783 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
784 if (ifa1
->ifa_flags
& IFA_F_SECONDARY
) {
785 /* Another address from our subnet? */
786 if (ifa1
->ifa_mask
== prim
->ifa_mask
&&
787 inet_ifa_match(ifa1
->ifa_address
, prim
))
790 /* We reached the secondaries, so
791 * same_prefsrc should be determined.
795 /* Search new prim1 if ifa1 is not
796 * using the current prim1
799 ifa1
->ifa_mask
!= prim1
->ifa_mask
||
800 !inet_ifa_match(ifa1
->ifa_address
, prim1
))
801 prim1
= inet_ifa_byprefix(in_dev
,
806 if (prim1
->ifa_local
!= prim
->ifa_local
)
810 if (prim
->ifa_local
!= ifa1
->ifa_local
)
816 if (ifa
->ifa_local
== ifa1
->ifa_local
)
818 if (ifa
->ifa_broadcast
== ifa1
->ifa_broadcast
)
820 if (brd
== ifa1
->ifa_broadcast
)
822 if (any
== ifa1
->ifa_broadcast
)
824 /* primary has network specific broadcasts */
825 if (prim1
== ifa1
&& ifa1
->ifa_prefixlen
< 31) {
826 __be32 brd1
= ifa1
->ifa_address
| ~ifa1
->ifa_mask
;
827 __be32 any1
= ifa1
->ifa_address
& ifa1
->ifa_mask
;
829 if (!ipv4_is_zeronet(any1
)) {
830 if (ifa
->ifa_broadcast
== brd1
||
831 ifa
->ifa_broadcast
== any1
)
833 if (brd
== brd1
|| brd
== any1
)
835 if (any
== brd1
|| any
== any1
)
842 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
843 if (subnet
&& ifa
->ifa_prefixlen
< 31) {
845 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, brd
, 32, prim
);
847 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, any
, 32, prim
);
849 if (!(ok
& LOCAL_OK
)) {
850 fib_magic(RTM_DELROUTE
, RTN_LOCAL
, ifa
->ifa_local
, 32, prim
);
852 /* Check, that this local address finally disappeared. */
854 inet_addr_type(dev_net(dev
), ifa
->ifa_local
) != RTN_LOCAL
) {
855 /* And the last, but not the least thing.
856 * We must flush stray FIB entries.
858 * First of all, we scan fib_info list searching
859 * for stray nexthop entries, then ignite fib_flush.
861 if (fib_sync_down_addr(dev_net(dev
), ifa
->ifa_local
))
862 fib_flush(dev_net(dev
));
871 static void nl_fib_lookup(struct fib_result_nl
*frn
, struct fib_table
*tb
)
874 struct fib_result res
;
875 struct flowi4 fl4
= {
876 .flowi4_mark
= frn
->fl_mark
,
877 .daddr
= frn
->fl_addr
,
878 .flowi4_tos
= frn
->fl_tos
,
879 .flowi4_scope
= frn
->fl_scope
,
882 #ifdef CONFIG_IP_MULTIPLE_TABLES
890 frn
->tb_id
= tb
->tb_id
;
892 frn
->err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
895 frn
->prefixlen
= res
.prefixlen
;
896 frn
->nh_sel
= res
.nh_sel
;
897 frn
->type
= res
.type
;
898 frn
->scope
= res
.scope
;
905 static void nl_fib_input(struct sk_buff
*skb
)
908 struct fib_result_nl
*frn
;
909 struct nlmsghdr
*nlh
;
910 struct fib_table
*tb
;
913 net
= sock_net(skb
->sk
);
914 nlh
= nlmsg_hdr(skb
);
915 if (skb
->len
< NLMSG_SPACE(0) || skb
->len
< nlh
->nlmsg_len
||
916 nlh
->nlmsg_len
< NLMSG_LENGTH(sizeof(*frn
)))
919 skb
= skb_clone(skb
, GFP_KERNEL
);
922 nlh
= nlmsg_hdr(skb
);
924 frn
= (struct fib_result_nl
*) NLMSG_DATA(nlh
);
925 tb
= fib_get_table(net
, frn
->tb_id_in
);
927 nl_fib_lookup(frn
, tb
);
929 pid
= NETLINK_CB(skb
).pid
; /* pid of sending process */
930 NETLINK_CB(skb
).pid
= 0; /* from kernel */
931 NETLINK_CB(skb
).dst_group
= 0; /* unicast */
932 netlink_unicast(net
->ipv4
.fibnl
, skb
, pid
, MSG_DONTWAIT
);
935 static int __net_init
nl_fib_lookup_init(struct net
*net
)
938 sk
= netlink_kernel_create(net
, NETLINK_FIB_LOOKUP
, 0,
939 nl_fib_input
, NULL
, THIS_MODULE
);
941 return -EAFNOSUPPORT
;
942 net
->ipv4
.fibnl
= sk
;
946 static void nl_fib_lookup_exit(struct net
*net
)
948 netlink_kernel_release(net
->ipv4
.fibnl
);
949 net
->ipv4
.fibnl
= NULL
;
952 static void fib_disable_ip(struct net_device
*dev
, int force
, int delay
)
954 if (fib_sync_down_dev(dev
, force
))
955 fib_flush(dev_net(dev
));
956 rt_cache_flush(dev_net(dev
), delay
);
960 static int fib_inetaddr_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
962 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
963 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
964 struct net
*net
= dev_net(dev
);
969 #ifdef CONFIG_IP_ROUTE_MULTIPATH
972 atomic_inc(&net
->ipv4
.dev_addr_genid
);
973 rt_cache_flush(dev_net(dev
), -1);
976 fib_del_ifaddr(ifa
, NULL
);
977 atomic_inc(&net
->ipv4
.dev_addr_genid
);
978 if (ifa
->ifa_dev
->ifa_list
== NULL
) {
979 /* Last address was deleted from this interface.
982 fib_disable_ip(dev
, 1, 0);
984 rt_cache_flush(dev_net(dev
), -1);
991 static int fib_netdev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
993 struct net_device
*dev
= ptr
;
994 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
995 struct net
*net
= dev_net(dev
);
997 if (event
== NETDEV_UNREGISTER
) {
998 fib_disable_ip(dev
, 2, -1);
1008 fib_add_ifaddr(ifa
);
1009 } endfor_ifa(in_dev
);
1010 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1013 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1014 rt_cache_flush(dev_net(dev
), -1);
1017 fib_disable_ip(dev
, 0, 0);
1019 case NETDEV_CHANGEMTU
:
1021 rt_cache_flush(dev_net(dev
), 0);
1023 case NETDEV_UNREGISTER_BATCH
:
1024 /* The batch unregister is only called on the first
1025 * device in the list of devices being unregistered.
1026 * Therefore we should not pass dev_net(dev) in here.
1028 rt_cache_flush_batch(NULL
);
1034 static struct notifier_block fib_inetaddr_notifier
= {
1035 .notifier_call
= fib_inetaddr_event
,
1038 static struct notifier_block fib_netdev_notifier
= {
1039 .notifier_call
= fib_netdev_event
,
1042 static int __net_init
ip_fib_net_init(struct net
*net
)
1045 size_t size
= sizeof(struct hlist_head
) * FIB_TABLE_HASHSZ
;
1047 /* Avoid false sharing : Use at least a full cache line */
1048 size
= max_t(size_t, size
, L1_CACHE_BYTES
);
1050 net
->ipv4
.fib_table_hash
= kzalloc(size
, GFP_KERNEL
);
1051 if (net
->ipv4
.fib_table_hash
== NULL
)
1054 err
= fib4_rules_init(net
);
1060 kfree(net
->ipv4
.fib_table_hash
);
1064 static void ip_fib_net_exit(struct net
*net
)
1068 #ifdef CONFIG_IP_MULTIPLE_TABLES
1069 fib4_rules_exit(net
);
1073 for (i
= 0; i
< FIB_TABLE_HASHSZ
; i
++) {
1074 struct fib_table
*tb
;
1075 struct hlist_head
*head
;
1076 struct hlist_node
*node
, *tmp
;
1078 head
= &net
->ipv4
.fib_table_hash
[i
];
1079 hlist_for_each_entry_safe(tb
, node
, tmp
, head
, tb_hlist
) {
1081 fib_table_flush(tb
);
1086 kfree(net
->ipv4
.fib_table_hash
);
1089 static int __net_init
fib_net_init(struct net
*net
)
1093 error
= ip_fib_net_init(net
);
1096 error
= nl_fib_lookup_init(net
);
1099 error
= fib_proc_init(net
);
1106 nl_fib_lookup_exit(net
);
1108 ip_fib_net_exit(net
);
1112 static void __net_exit
fib_net_exit(struct net
*net
)
1115 nl_fib_lookup_exit(net
);
1116 ip_fib_net_exit(net
);
1119 static struct pernet_operations fib_net_ops
= {
1120 .init
= fib_net_init
,
1121 .exit
= fib_net_exit
,
1124 void __init
ip_fib_init(void)
1126 rtnl_register(PF_INET
, RTM_NEWROUTE
, inet_rtm_newroute
, NULL
, NULL
);
1127 rtnl_register(PF_INET
, RTM_DELROUTE
, inet_rtm_delroute
, NULL
, NULL
);
1128 rtnl_register(PF_INET
, RTM_GETROUTE
, NULL
, inet_dump_fib
, NULL
);
1130 register_pernet_subsys(&fib_net_ops
);
1131 register_netdevice_notifier(&fib_netdev_notifier
);
1132 register_inetaddr_notifier(&fib_inetaddr_notifier
);