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
);
89 h
= id
& (FIB_TABLE_HASHSZ
- 1);
90 hlist_add_head_rcu(&tb
->tb_hlist
, &net
->ipv4
.fib_table_hash
[h
]);
94 struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
97 struct hlist_node
*node
;
98 struct hlist_head
*head
;
103 h
= id
& (FIB_TABLE_HASHSZ
- 1);
106 head
= &net
->ipv4
.fib_table_hash
[h
];
107 hlist_for_each_entry_rcu(tb
, node
, head
, tb_hlist
) {
108 if (tb
->tb_id
== id
) {
116 #endif /* CONFIG_IP_MULTIPLE_TABLES */
118 static void fib_flush(struct net
*net
)
121 struct fib_table
*tb
;
122 struct hlist_node
*node
;
123 struct hlist_head
*head
;
126 for (h
= 0; h
< FIB_TABLE_HASHSZ
; h
++) {
127 head
= &net
->ipv4
.fib_table_hash
[h
];
128 hlist_for_each_entry(tb
, node
, head
, tb_hlist
)
129 flushed
+= fib_table_flush(tb
);
133 rt_cache_flush(net
, -1);
137 * Find address type as if only "dev" was present in the system. If
138 * on_dev is NULL then all interfaces are taken into consideration.
140 static inline unsigned int __inet_dev_addr_type(struct net
*net
,
141 const struct net_device
*dev
,
144 struct flowi4 fl4
= { .daddr
= addr
};
145 struct fib_result res
;
146 unsigned int ret
= RTN_BROADCAST
;
147 struct fib_table
*local_table
;
149 if (ipv4_is_zeronet(addr
) || ipv4_is_lbcast(addr
))
150 return RTN_BROADCAST
;
151 if (ipv4_is_multicast(addr
))
152 return RTN_MULTICAST
;
154 #ifdef CONFIG_IP_MULTIPLE_TABLES
158 local_table
= fib_get_table(net
, RT_TABLE_LOCAL
);
162 if (!fib_table_lookup(local_table
, &fl4
, &res
, FIB_LOOKUP_NOREF
)) {
163 if (!dev
|| dev
== res
.fi
->fib_dev
)
171 unsigned int inet_addr_type(struct net
*net
, __be32 addr
)
173 return __inet_dev_addr_type(net
, NULL
, addr
);
175 EXPORT_SYMBOL(inet_addr_type
);
177 unsigned int inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
,
180 return __inet_dev_addr_type(net
, dev
, addr
);
182 EXPORT_SYMBOL(inet_dev_addr_type
);
184 __be32
fib_compute_spec_dst(struct sk_buff
*skb
)
186 struct net_device
*dev
= skb
->dev
;
187 struct in_device
*in_dev
;
188 struct fib_result res
;
194 rt
= skb_rtable(skb
);
195 if (!(rt
->rt_flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
)))
196 return ip_hdr(skb
)->daddr
;
198 in_dev
= __in_dev_get_rcu(dev
);
203 scope
= RT_SCOPE_UNIVERSE
;
204 if (!ipv4_is_zeronet(ip_hdr(skb
)->saddr
)) {
206 fl4
.flowi4_iif
= net
->loopback_dev
->ifindex
;
207 fl4
.daddr
= ip_hdr(skb
)->saddr
;
209 fl4
.flowi4_tos
= RT_TOS(ip_hdr(skb
)->tos
);
210 fl4
.flowi4_scope
= scope
;
211 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(in_dev
) ? skb
->mark
: 0;
212 if (!fib_lookup(net
, &fl4
, &res
))
213 return FIB_RES_PREFSRC(net
, res
);
215 scope
= RT_SCOPE_LINK
;
218 return inet_select_addr(dev
, ip_hdr(skb
)->saddr
, scope
);
221 #ifdef CONFIG_IP_ROUTE_CLASSID
222 int fib_num_tclassid_users __read_mostly
;
225 /* Given (packet source, input interface) and optional (dst, oif, tos):
226 * - (main) check, that source is valid i.e. not broadcast or our local
228 * - figure out what "logical" interface this packet arrived
229 * and calculate "specific destination" address.
230 * - check, that packet arrived from expected physical interface.
231 * called with rcu_read_lock()
233 static int __fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
234 u8 tos
, int oif
, struct net_device
*dev
,
235 int rpf
, struct in_device
*idev
, u32
*itag
)
237 int ret
, no_addr
, accept_local
;
238 struct fib_result res
;
244 fl4
.flowi4_iif
= oif
;
247 fl4
.flowi4_tos
= tos
;
248 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
250 no_addr
= accept_local
= 0;
251 no_addr
= idev
->ifa_list
== NULL
;
253 accept_local
= IN_DEV_ACCEPT_LOCAL(idev
);
254 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(idev
) ? skb
->mark
: 0;
257 if (fib_lookup(net
, &fl4
, &res
))
259 if (res
.type
!= RTN_UNICAST
) {
260 if (res
.type
!= RTN_LOCAL
|| !accept_local
)
263 fib_combine_itag(itag
, &res
);
266 #ifdef CONFIG_IP_ROUTE_MULTIPATH
267 for (ret
= 0; ret
< res
.fi
->fib_nhs
; ret
++) {
268 struct fib_nh
*nh
= &res
.fi
->fib_nh
[ret
];
270 if (nh
->nh_dev
== dev
) {
276 if (FIB_RES_DEV(res
) == dev
)
280 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
287 fl4
.flowi4_oif
= dev
->ifindex
;
290 if (fib_lookup(net
, &fl4
, &res
) == 0) {
291 if (res
.type
== RTN_UNICAST
)
292 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
308 /* Ignore rp_filter for packets protected by IPsec. */
309 int fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
310 u8 tos
, int oif
, struct net_device
*dev
,
311 struct in_device
*idev
, u32
*itag
)
313 int r
= secpath_exists(skb
) ? 0 : IN_DEV_RPFILTER(idev
);
315 if (!r
&& !fib_num_tclassid_users
) {
319 return __fib_validate_source(skb
, src
, dst
, tos
, oif
, dev
, r
, idev
, itag
);
322 static inline __be32
sk_extract_addr(struct sockaddr
*addr
)
324 return ((struct sockaddr_in
*) addr
)->sin_addr
.s_addr
;
327 static int put_rtax(struct nlattr
*mx
, int len
, int type
, u32 value
)
331 nla
= (struct nlattr
*) ((char *) mx
+ len
);
332 nla
->nla_type
= type
;
333 nla
->nla_len
= nla_attr_size(4);
334 *(u32
*) nla_data(nla
) = value
;
336 return len
+ nla_total_size(4);
339 static int rtentry_to_fib_config(struct net
*net
, int cmd
, struct rtentry
*rt
,
340 struct fib_config
*cfg
)
345 memset(cfg
, 0, sizeof(*cfg
));
346 cfg
->fc_nlinfo
.nl_net
= net
;
348 if (rt
->rt_dst
.sa_family
!= AF_INET
)
349 return -EAFNOSUPPORT
;
352 * Check mask for validity:
353 * a) it must be contiguous.
354 * b) destination must have all host bits clear.
355 * c) if application forgot to set correct family (AF_INET),
356 * reject request unless it is absolutely clear i.e.
357 * both family and mask are zero.
360 addr
= sk_extract_addr(&rt
->rt_dst
);
361 if (!(rt
->rt_flags
& RTF_HOST
)) {
362 __be32 mask
= sk_extract_addr(&rt
->rt_genmask
);
364 if (rt
->rt_genmask
.sa_family
!= AF_INET
) {
365 if (mask
|| rt
->rt_genmask
.sa_family
)
366 return -EAFNOSUPPORT
;
369 if (bad_mask(mask
, addr
))
372 plen
= inet_mask_len(mask
);
375 cfg
->fc_dst_len
= plen
;
378 if (cmd
!= SIOCDELRT
) {
379 cfg
->fc_nlflags
= NLM_F_CREATE
;
380 cfg
->fc_protocol
= RTPROT_BOOT
;
384 cfg
->fc_priority
= rt
->rt_metric
- 1;
386 if (rt
->rt_flags
& RTF_REJECT
) {
387 cfg
->fc_scope
= RT_SCOPE_HOST
;
388 cfg
->fc_type
= RTN_UNREACHABLE
;
392 cfg
->fc_scope
= RT_SCOPE_NOWHERE
;
393 cfg
->fc_type
= RTN_UNICAST
;
397 struct net_device
*dev
;
398 char devname
[IFNAMSIZ
];
400 if (copy_from_user(devname
, rt
->rt_dev
, IFNAMSIZ
-1))
403 devname
[IFNAMSIZ
-1] = 0;
404 colon
= strchr(devname
, ':');
407 dev
= __dev_get_by_name(net
, devname
);
410 cfg
->fc_oif
= dev
->ifindex
;
412 struct in_ifaddr
*ifa
;
413 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
417 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
)
418 if (strcmp(ifa
->ifa_label
, devname
) == 0)
422 cfg
->fc_prefsrc
= ifa
->ifa_local
;
426 addr
= sk_extract_addr(&rt
->rt_gateway
);
427 if (rt
->rt_gateway
.sa_family
== AF_INET
&& addr
) {
429 if (rt
->rt_flags
& RTF_GATEWAY
&&
430 inet_addr_type(net
, addr
) == RTN_UNICAST
)
431 cfg
->fc_scope
= RT_SCOPE_UNIVERSE
;
434 if (cmd
== SIOCDELRT
)
437 if (rt
->rt_flags
& RTF_GATEWAY
&& !cfg
->fc_gw
)
440 if (cfg
->fc_scope
== RT_SCOPE_NOWHERE
)
441 cfg
->fc_scope
= RT_SCOPE_LINK
;
443 if (rt
->rt_flags
& (RTF_MTU
| RTF_WINDOW
| RTF_IRTT
)) {
447 mx
= kzalloc(3 * nla_total_size(4), GFP_KERNEL
);
451 if (rt
->rt_flags
& RTF_MTU
)
452 len
= put_rtax(mx
, len
, RTAX_ADVMSS
, rt
->rt_mtu
- 40);
454 if (rt
->rt_flags
& RTF_WINDOW
)
455 len
= put_rtax(mx
, len
, RTAX_WINDOW
, rt
->rt_window
);
457 if (rt
->rt_flags
& RTF_IRTT
)
458 len
= put_rtax(mx
, len
, RTAX_RTT
, rt
->rt_irtt
<< 3);
461 cfg
->fc_mx_len
= len
;
468 * Handle IP routing ioctl calls.
469 * These are used to manipulate the routing tables
471 int ip_rt_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
473 struct fib_config cfg
;
478 case SIOCADDRT
: /* Add a route */
479 case SIOCDELRT
: /* Delete a route */
480 if (!capable(CAP_NET_ADMIN
))
483 if (copy_from_user(&rt
, arg
, sizeof(rt
)))
487 err
= rtentry_to_fib_config(net
, cmd
, &rt
, &cfg
);
489 struct fib_table
*tb
;
491 if (cmd
== SIOCDELRT
) {
492 tb
= fib_get_table(net
, cfg
.fc_table
);
494 err
= fib_table_delete(tb
, &cfg
);
498 tb
= fib_new_table(net
, cfg
.fc_table
);
500 err
= fib_table_insert(tb
, &cfg
);
505 /* allocated by rtentry_to_fib_config() */
514 const struct nla_policy rtm_ipv4_policy
[RTA_MAX
+ 1] = {
515 [RTA_DST
] = { .type
= NLA_U32
},
516 [RTA_SRC
] = { .type
= NLA_U32
},
517 [RTA_IIF
] = { .type
= NLA_U32
},
518 [RTA_OIF
] = { .type
= NLA_U32
},
519 [RTA_GATEWAY
] = { .type
= NLA_U32
},
520 [RTA_PRIORITY
] = { .type
= NLA_U32
},
521 [RTA_PREFSRC
] = { .type
= NLA_U32
},
522 [RTA_METRICS
] = { .type
= NLA_NESTED
},
523 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
524 [RTA_FLOW
] = { .type
= NLA_U32
},
527 static int rtm_to_fib_config(struct net
*net
, struct sk_buff
*skb
,
528 struct nlmsghdr
*nlh
, struct fib_config
*cfg
)
534 err
= nlmsg_validate(nlh
, sizeof(*rtm
), RTA_MAX
, rtm_ipv4_policy
);
538 memset(cfg
, 0, sizeof(*cfg
));
540 rtm
= nlmsg_data(nlh
);
541 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
542 cfg
->fc_tos
= rtm
->rtm_tos
;
543 cfg
->fc_table
= rtm
->rtm_table
;
544 cfg
->fc_protocol
= rtm
->rtm_protocol
;
545 cfg
->fc_scope
= rtm
->rtm_scope
;
546 cfg
->fc_type
= rtm
->rtm_type
;
547 cfg
->fc_flags
= rtm
->rtm_flags
;
548 cfg
->fc_nlflags
= nlh
->nlmsg_flags
;
550 cfg
->fc_nlinfo
.pid
= NETLINK_CB(skb
).pid
;
551 cfg
->fc_nlinfo
.nlh
= nlh
;
552 cfg
->fc_nlinfo
.nl_net
= net
;
554 if (cfg
->fc_type
> RTN_MAX
) {
559 nlmsg_for_each_attr(attr
, nlh
, sizeof(struct rtmsg
), remaining
) {
560 switch (nla_type(attr
)) {
562 cfg
->fc_dst
= nla_get_be32(attr
);
565 cfg
->fc_oif
= nla_get_u32(attr
);
568 cfg
->fc_gw
= nla_get_be32(attr
);
571 cfg
->fc_priority
= nla_get_u32(attr
);
574 cfg
->fc_prefsrc
= nla_get_be32(attr
);
577 cfg
->fc_mx
= nla_data(attr
);
578 cfg
->fc_mx_len
= nla_len(attr
);
581 cfg
->fc_mp
= nla_data(attr
);
582 cfg
->fc_mp_len
= nla_len(attr
);
585 cfg
->fc_flow
= nla_get_u32(attr
);
588 cfg
->fc_table
= nla_get_u32(attr
);
598 static int inet_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
600 struct net
*net
= sock_net(skb
->sk
);
601 struct fib_config cfg
;
602 struct fib_table
*tb
;
605 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
609 tb
= fib_get_table(net
, cfg
.fc_table
);
615 err
= fib_table_delete(tb
, &cfg
);
620 static int inet_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
622 struct net
*net
= sock_net(skb
->sk
);
623 struct fib_config cfg
;
624 struct fib_table
*tb
;
627 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
631 tb
= fib_new_table(net
, cfg
.fc_table
);
637 err
= fib_table_insert(tb
, &cfg
);
642 static int inet_dump_fib(struct sk_buff
*skb
, struct netlink_callback
*cb
)
644 struct net
*net
= sock_net(skb
->sk
);
646 unsigned int e
= 0, s_e
;
647 struct fib_table
*tb
;
648 struct hlist_node
*node
;
649 struct hlist_head
*head
;
652 if (nlmsg_len(cb
->nlh
) >= sizeof(struct rtmsg
) &&
653 ((struct rtmsg
*) nlmsg_data(cb
->nlh
))->rtm_flags
& RTM_F_CLONED
)
654 return ip_rt_dump(skb
, cb
);
659 for (h
= s_h
; h
< FIB_TABLE_HASHSZ
; h
++, s_e
= 0) {
661 head
= &net
->ipv4
.fib_table_hash
[h
];
662 hlist_for_each_entry(tb
, node
, head
, tb_hlist
) {
666 memset(&cb
->args
[2], 0, sizeof(cb
->args
) -
667 2 * sizeof(cb
->args
[0]));
668 if (fib_table_dump(tb
, skb
, cb
) < 0)
682 /* Prepare and feed intra-kernel routing request.
683 * Really, it should be netlink message, but :-( netlink
684 * can be not configured, so that we feed it directly
685 * to fib engine. It is legal, because all events occur
686 * only when netlink is already locked.
688 static void fib_magic(int cmd
, int type
, __be32 dst
, int dst_len
, struct in_ifaddr
*ifa
)
690 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
691 struct fib_table
*tb
;
692 struct fib_config cfg
= {
693 .fc_protocol
= RTPROT_KERNEL
,
696 .fc_dst_len
= dst_len
,
697 .fc_prefsrc
= ifa
->ifa_local
,
698 .fc_oif
= ifa
->ifa_dev
->dev
->ifindex
,
699 .fc_nlflags
= NLM_F_CREATE
| NLM_F_APPEND
,
705 if (type
== RTN_UNICAST
)
706 tb
= fib_new_table(net
, RT_TABLE_MAIN
);
708 tb
= fib_new_table(net
, RT_TABLE_LOCAL
);
713 cfg
.fc_table
= tb
->tb_id
;
715 if (type
!= RTN_LOCAL
)
716 cfg
.fc_scope
= RT_SCOPE_LINK
;
718 cfg
.fc_scope
= RT_SCOPE_HOST
;
720 if (cmd
== RTM_NEWROUTE
)
721 fib_table_insert(tb
, &cfg
);
723 fib_table_delete(tb
, &cfg
);
726 void fib_add_ifaddr(struct in_ifaddr
*ifa
)
728 struct in_device
*in_dev
= ifa
->ifa_dev
;
729 struct net_device
*dev
= in_dev
->dev
;
730 struct in_ifaddr
*prim
= ifa
;
731 __be32 mask
= ifa
->ifa_mask
;
732 __be32 addr
= ifa
->ifa_local
;
733 __be32 prefix
= ifa
->ifa_address
& mask
;
735 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
736 prim
= inet_ifa_byprefix(in_dev
, prefix
, mask
);
738 pr_warn("%s: bug: prim == NULL\n", __func__
);
743 fib_magic(RTM_NEWROUTE
, RTN_LOCAL
, addr
, 32, prim
);
745 if (!(dev
->flags
& IFF_UP
))
748 /* Add broadcast address, if it is explicitly assigned. */
749 if (ifa
->ifa_broadcast
&& ifa
->ifa_broadcast
!= htonl(0xFFFFFFFF))
750 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
752 if (!ipv4_is_zeronet(prefix
) && !(ifa
->ifa_flags
& IFA_F_SECONDARY
) &&
753 (prefix
!= addr
|| ifa
->ifa_prefixlen
< 32)) {
754 fib_magic(RTM_NEWROUTE
,
755 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
756 prefix
, ifa
->ifa_prefixlen
, prim
);
758 /* Add network specific broadcasts, when it takes a sense */
759 if (ifa
->ifa_prefixlen
< 31) {
760 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
, 32, prim
);
761 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
| ~mask
,
767 /* Delete primary or secondary address.
768 * Optionally, on secondary address promotion consider the addresses
769 * from subnet iprim as deleted, even if they are in device list.
770 * In this case the secondary ifa can be in device list.
772 void fib_del_ifaddr(struct in_ifaddr
*ifa
, struct in_ifaddr
*iprim
)
774 struct in_device
*in_dev
= ifa
->ifa_dev
;
775 struct net_device
*dev
= in_dev
->dev
;
776 struct in_ifaddr
*ifa1
;
777 struct in_ifaddr
*prim
= ifa
, *prim1
= NULL
;
778 __be32 brd
= ifa
->ifa_address
| ~ifa
->ifa_mask
;
779 __be32 any
= ifa
->ifa_address
& ifa
->ifa_mask
;
785 int subnet
= 0; /* Primary network */
786 int gone
= 1; /* Address is missing */
787 int same_prefsrc
= 0; /* Another primary with same IP */
789 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
790 prim
= inet_ifa_byprefix(in_dev
, any
, ifa
->ifa_mask
);
792 pr_warn("%s: bug: prim == NULL\n", __func__
);
795 if (iprim
&& iprim
!= prim
) {
796 pr_warn("%s: bug: iprim != prim\n", __func__
);
799 } else if (!ipv4_is_zeronet(any
) &&
800 (any
!= ifa
->ifa_local
|| ifa
->ifa_prefixlen
< 32)) {
801 fib_magic(RTM_DELROUTE
,
802 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
803 any
, ifa
->ifa_prefixlen
, prim
);
807 /* Deletion is more complicated than add.
808 * We should take care of not to delete too much :-)
810 * Scan address list to be sure that addresses are really gone.
813 for (ifa1
= in_dev
->ifa_list
; ifa1
; ifa1
= ifa1
->ifa_next
) {
815 /* promotion, keep the IP */
819 /* Ignore IFAs from our subnet */
820 if (iprim
&& ifa1
->ifa_mask
== iprim
->ifa_mask
&&
821 inet_ifa_match(ifa1
->ifa_address
, iprim
))
824 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
825 if (ifa1
->ifa_flags
& IFA_F_SECONDARY
) {
826 /* Another address from our subnet? */
827 if (ifa1
->ifa_mask
== prim
->ifa_mask
&&
828 inet_ifa_match(ifa1
->ifa_address
, prim
))
831 /* We reached the secondaries, so
832 * same_prefsrc should be determined.
836 /* Search new prim1 if ifa1 is not
837 * using the current prim1
840 ifa1
->ifa_mask
!= prim1
->ifa_mask
||
841 !inet_ifa_match(ifa1
->ifa_address
, prim1
))
842 prim1
= inet_ifa_byprefix(in_dev
,
847 if (prim1
->ifa_local
!= prim
->ifa_local
)
851 if (prim
->ifa_local
!= ifa1
->ifa_local
)
857 if (ifa
->ifa_local
== ifa1
->ifa_local
)
859 if (ifa
->ifa_broadcast
== ifa1
->ifa_broadcast
)
861 if (brd
== ifa1
->ifa_broadcast
)
863 if (any
== ifa1
->ifa_broadcast
)
865 /* primary has network specific broadcasts */
866 if (prim1
== ifa1
&& ifa1
->ifa_prefixlen
< 31) {
867 __be32 brd1
= ifa1
->ifa_address
| ~ifa1
->ifa_mask
;
868 __be32 any1
= ifa1
->ifa_address
& ifa1
->ifa_mask
;
870 if (!ipv4_is_zeronet(any1
)) {
871 if (ifa
->ifa_broadcast
== brd1
||
872 ifa
->ifa_broadcast
== any1
)
874 if (brd
== brd1
|| brd
== any1
)
876 if (any
== brd1
|| any
== any1
)
883 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
884 if (subnet
&& ifa
->ifa_prefixlen
< 31) {
886 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, brd
, 32, prim
);
888 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, any
, 32, prim
);
890 if (!(ok
& LOCAL_OK
)) {
891 fib_magic(RTM_DELROUTE
, RTN_LOCAL
, ifa
->ifa_local
, 32, prim
);
893 /* Check, that this local address finally disappeared. */
895 inet_addr_type(dev_net(dev
), ifa
->ifa_local
) != RTN_LOCAL
) {
896 /* And the last, but not the least thing.
897 * We must flush stray FIB entries.
899 * First of all, we scan fib_info list searching
900 * for stray nexthop entries, then ignite fib_flush.
902 if (fib_sync_down_addr(dev_net(dev
), ifa
->ifa_local
))
903 fib_flush(dev_net(dev
));
912 static void nl_fib_lookup(struct fib_result_nl
*frn
, struct fib_table
*tb
)
915 struct fib_result res
;
916 struct flowi4 fl4
= {
917 .flowi4_mark
= frn
->fl_mark
,
918 .daddr
= frn
->fl_addr
,
919 .flowi4_tos
= frn
->fl_tos
,
920 .flowi4_scope
= frn
->fl_scope
,
923 #ifdef CONFIG_IP_MULTIPLE_TABLES
931 frn
->tb_id
= tb
->tb_id
;
933 frn
->err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
936 frn
->prefixlen
= res
.prefixlen
;
937 frn
->nh_sel
= res
.nh_sel
;
938 frn
->type
= res
.type
;
939 frn
->scope
= res
.scope
;
946 static void nl_fib_input(struct sk_buff
*skb
)
949 struct fib_result_nl
*frn
;
950 struct nlmsghdr
*nlh
;
951 struct fib_table
*tb
;
954 net
= sock_net(skb
->sk
);
955 nlh
= nlmsg_hdr(skb
);
956 if (skb
->len
< NLMSG_SPACE(0) || skb
->len
< nlh
->nlmsg_len
||
957 nlh
->nlmsg_len
< NLMSG_LENGTH(sizeof(*frn
)))
960 skb
= skb_clone(skb
, GFP_KERNEL
);
963 nlh
= nlmsg_hdr(skb
);
965 frn
= (struct fib_result_nl
*) NLMSG_DATA(nlh
);
966 tb
= fib_get_table(net
, frn
->tb_id_in
);
968 nl_fib_lookup(frn
, tb
);
970 pid
= NETLINK_CB(skb
).pid
; /* pid of sending process */
971 NETLINK_CB(skb
).pid
= 0; /* from kernel */
972 NETLINK_CB(skb
).dst_group
= 0; /* unicast */
973 netlink_unicast(net
->ipv4
.fibnl
, skb
, pid
, MSG_DONTWAIT
);
976 static int __net_init
nl_fib_lookup_init(struct net
*net
)
979 struct netlink_kernel_cfg cfg
= {
980 .input
= nl_fib_input
,
983 sk
= netlink_kernel_create(net
, NETLINK_FIB_LOOKUP
, THIS_MODULE
, &cfg
);
985 return -EAFNOSUPPORT
;
986 net
->ipv4
.fibnl
= sk
;
990 static void nl_fib_lookup_exit(struct net
*net
)
992 netlink_kernel_release(net
->ipv4
.fibnl
);
993 net
->ipv4
.fibnl
= NULL
;
996 static void fib_disable_ip(struct net_device
*dev
, int force
, int delay
)
998 if (fib_sync_down_dev(dev
, force
))
999 fib_flush(dev_net(dev
));
1000 rt_cache_flush(dev_net(dev
), delay
);
1004 static int fib_inetaddr_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1006 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
1007 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
1008 struct net
*net
= dev_net(dev
);
1012 fib_add_ifaddr(ifa
);
1013 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1016 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1017 rt_cache_flush(dev_net(dev
), -1);
1020 fib_del_ifaddr(ifa
, NULL
);
1021 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1022 if (ifa
->ifa_dev
->ifa_list
== NULL
) {
1023 /* Last address was deleted from this interface.
1026 fib_disable_ip(dev
, 1, 0);
1028 rt_cache_flush(dev_net(dev
), -1);
1035 static int fib_netdev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1037 struct net_device
*dev
= ptr
;
1038 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
1039 struct net
*net
= dev_net(dev
);
1041 if (event
== NETDEV_UNREGISTER
) {
1042 fib_disable_ip(dev
, 2, -1);
1052 fib_add_ifaddr(ifa
);
1053 } endfor_ifa(in_dev
);
1054 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1057 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1058 rt_cache_flush(dev_net(dev
), -1);
1061 fib_disable_ip(dev
, 0, 0);
1063 case NETDEV_CHANGEMTU
:
1065 rt_cache_flush(dev_net(dev
), 0);
1067 case NETDEV_UNREGISTER_BATCH
:
1068 /* The batch unregister is only called on the first
1069 * device in the list of devices being unregistered.
1070 * Therefore we should not pass dev_net(dev) in here.
1072 rt_cache_flush_batch(NULL
);
1078 static struct notifier_block fib_inetaddr_notifier
= {
1079 .notifier_call
= fib_inetaddr_event
,
1082 static struct notifier_block fib_netdev_notifier
= {
1083 .notifier_call
= fib_netdev_event
,
1086 static int __net_init
ip_fib_net_init(struct net
*net
)
1089 size_t size
= sizeof(struct hlist_head
) * FIB_TABLE_HASHSZ
;
1091 /* Avoid false sharing : Use at least a full cache line */
1092 size
= max_t(size_t, size
, L1_CACHE_BYTES
);
1094 net
->ipv4
.fib_table_hash
= kzalloc(size
, GFP_KERNEL
);
1095 if (net
->ipv4
.fib_table_hash
== NULL
)
1098 err
= fib4_rules_init(net
);
1104 kfree(net
->ipv4
.fib_table_hash
);
1108 static void ip_fib_net_exit(struct net
*net
)
1112 #ifdef CONFIG_IP_MULTIPLE_TABLES
1113 fib4_rules_exit(net
);
1117 for (i
= 0; i
< FIB_TABLE_HASHSZ
; i
++) {
1118 struct fib_table
*tb
;
1119 struct hlist_head
*head
;
1120 struct hlist_node
*node
, *tmp
;
1122 head
= &net
->ipv4
.fib_table_hash
[i
];
1123 hlist_for_each_entry_safe(tb
, node
, tmp
, head
, tb_hlist
) {
1125 fib_table_flush(tb
);
1130 kfree(net
->ipv4
.fib_table_hash
);
1133 static int __net_init
fib_net_init(struct net
*net
)
1137 error
= ip_fib_net_init(net
);
1140 error
= nl_fib_lookup_init(net
);
1143 error
= fib_proc_init(net
);
1150 nl_fib_lookup_exit(net
);
1152 ip_fib_net_exit(net
);
1156 static void __net_exit
fib_net_exit(struct net
*net
)
1159 nl_fib_lookup_exit(net
);
1160 ip_fib_net_exit(net
);
1163 static struct pernet_operations fib_net_ops
= {
1164 .init
= fib_net_init
,
1165 .exit
= fib_net_exit
,
1168 void __init
ip_fib_init(void)
1170 rtnl_register(PF_INET
, RTM_NEWROUTE
, inet_rtm_newroute
, NULL
, NULL
);
1171 rtnl_register(PF_INET
, RTM_DELROUTE
, inet_rtm_delroute
, NULL
, NULL
);
1172 rtnl_register(PF_INET
, RTM_GETROUTE
, NULL
, inet_dump_fib
, NULL
);
1174 register_pernet_subsys(&fib_net_ops
);
1175 register_netdevice_notifier(&fib_netdev_notifier
);
1176 register_inetaddr_notifier(&fib_inetaddr_notifier
);