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>
48 #include <net/l3mdev.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_main
, tb
);
99 case RT_TABLE_DEFAULT
:
100 rcu_assign_pointer(net
->ipv4
.fib_default
, tb
);
106 h
= id
& (FIB_TABLE_HASHSZ
- 1);
107 hlist_add_head_rcu(&tb
->tb_hlist
, &net
->ipv4
.fib_table_hash
[h
]);
110 EXPORT_SYMBOL_GPL(fib_new_table
);
112 /* caller must hold either rtnl or rcu read lock */
113 struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
115 struct fib_table
*tb
;
116 struct hlist_head
*head
;
121 h
= id
& (FIB_TABLE_HASHSZ
- 1);
123 head
= &net
->ipv4
.fib_table_hash
[h
];
124 hlist_for_each_entry_rcu(tb
, head
, tb_hlist
) {
130 #endif /* CONFIG_IP_MULTIPLE_TABLES */
132 static void fib_replace_table(struct net
*net
, struct fib_table
*old
,
133 struct fib_table
*new)
135 #ifdef CONFIG_IP_MULTIPLE_TABLES
136 switch (new->tb_id
) {
138 rcu_assign_pointer(net
->ipv4
.fib_main
, new);
140 case RT_TABLE_DEFAULT
:
141 rcu_assign_pointer(net
->ipv4
.fib_default
, new);
148 /* replace the old table in the hlist */
149 hlist_replace_rcu(&old
->tb_hlist
, &new->tb_hlist
);
152 int fib_unmerge(struct net
*net
)
154 struct fib_table
*old
, *new;
156 /* attempt to fetch local table if it has been allocated */
157 old
= fib_get_table(net
, RT_TABLE_LOCAL
);
161 new = fib_trie_unmerge(old
);
165 /* replace merged table with clean table */
167 fib_replace_table(net
, old
, new);
174 static void fib_flush(struct net
*net
)
179 for (h
= 0; h
< FIB_TABLE_HASHSZ
; h
++) {
180 struct hlist_head
*head
= &net
->ipv4
.fib_table_hash
[h
];
181 struct hlist_node
*tmp
;
182 struct fib_table
*tb
;
184 hlist_for_each_entry_safe(tb
, tmp
, head
, tb_hlist
)
185 flushed
+= fib_table_flush(tb
);
192 void fib_flush_external(struct net
*net
)
194 struct fib_table
*tb
;
195 struct hlist_head
*head
;
198 for (h
= 0; h
< FIB_TABLE_HASHSZ
; h
++) {
199 head
= &net
->ipv4
.fib_table_hash
[h
];
200 hlist_for_each_entry(tb
, head
, tb_hlist
)
201 fib_table_flush_external(tb
);
206 * Find address type as if only "dev" was present in the system. If
207 * on_dev is NULL then all interfaces are taken into consideration.
209 static inline unsigned int __inet_dev_addr_type(struct net
*net
,
210 const struct net_device
*dev
,
211 __be32 addr
, u32 tb_id
)
213 struct flowi4 fl4
= { .daddr
= addr
};
214 struct fib_result res
;
215 unsigned int ret
= RTN_BROADCAST
;
216 struct fib_table
*table
;
218 if (ipv4_is_zeronet(addr
) || ipv4_is_lbcast(addr
))
219 return RTN_BROADCAST
;
220 if (ipv4_is_multicast(addr
))
221 return RTN_MULTICAST
;
225 table
= fib_get_table(net
, tb_id
);
228 if (!fib_table_lookup(table
, &fl4
, &res
, FIB_LOOKUP_NOREF
)) {
229 if (!dev
|| dev
== res
.fi
->fib_dev
)
238 unsigned int inet_addr_type_table(struct net
*net
, __be32 addr
, u32 tb_id
)
240 return __inet_dev_addr_type(net
, NULL
, addr
, tb_id
);
242 EXPORT_SYMBOL(inet_addr_type_table
);
244 unsigned int inet_addr_type(struct net
*net
, __be32 addr
)
246 return __inet_dev_addr_type(net
, NULL
, addr
, RT_TABLE_LOCAL
);
248 EXPORT_SYMBOL(inet_addr_type
);
250 unsigned int inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
,
253 u32 rt_table
= l3mdev_fib_table(dev
) ? : RT_TABLE_LOCAL
;
255 return __inet_dev_addr_type(net
, dev
, addr
, rt_table
);
257 EXPORT_SYMBOL(inet_dev_addr_type
);
259 /* inet_addr_type with dev == NULL but using the table from a dev
260 * if one is associated
262 unsigned int inet_addr_type_dev_table(struct net
*net
,
263 const struct net_device
*dev
,
266 u32 rt_table
= l3mdev_fib_table(dev
) ? : RT_TABLE_LOCAL
;
268 return __inet_dev_addr_type(net
, NULL
, addr
, rt_table
);
270 EXPORT_SYMBOL(inet_addr_type_dev_table
);
272 __be32
fib_compute_spec_dst(struct sk_buff
*skb
)
274 struct net_device
*dev
= skb
->dev
;
275 struct in_device
*in_dev
;
276 struct fib_result res
;
281 rt
= skb_rtable(skb
);
282 if ((rt
->rt_flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
| RTCF_LOCAL
)) ==
284 return ip_hdr(skb
)->daddr
;
286 in_dev
= __in_dev_get_rcu(dev
);
291 scope
= RT_SCOPE_UNIVERSE
;
292 if (!ipv4_is_zeronet(ip_hdr(skb
)->saddr
)) {
293 struct flowi4 fl4
= {
294 .flowi4_iif
= LOOPBACK_IFINDEX
,
295 .daddr
= ip_hdr(skb
)->saddr
,
296 .flowi4_tos
= RT_TOS(ip_hdr(skb
)->tos
),
297 .flowi4_scope
= scope
,
298 .flowi4_mark
= IN_DEV_SRC_VMARK(in_dev
) ? skb
->mark
: 0,
300 if (!fib_lookup(net
, &fl4
, &res
, 0))
301 return FIB_RES_PREFSRC(net
, res
);
303 scope
= RT_SCOPE_LINK
;
306 return inet_select_addr(dev
, ip_hdr(skb
)->saddr
, scope
);
309 /* Given (packet source, input interface) and optional (dst, oif, tos):
310 * - (main) check, that source is valid i.e. not broadcast or our local
312 * - figure out what "logical" interface this packet arrived
313 * and calculate "specific destination" address.
314 * - check, that packet arrived from expected physical interface.
315 * called with rcu_read_lock()
317 static int __fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
318 u8 tos
, int oif
, struct net_device
*dev
,
319 int rpf
, struct in_device
*idev
, u32
*itag
)
322 struct fib_result res
;
328 fl4
.flowi4_iif
= l3mdev_master_ifindex_rcu(dev
);
330 fl4
.flowi4_iif
= oif
? : LOOPBACK_IFINDEX
;
333 fl4
.flowi4_tos
= tos
;
334 fl4
.flowi4_scope
= RT_SCOPE_UNIVERSE
;
335 fl4
.flowi4_tun_key
.tun_id
= 0;
336 fl4
.flowi4_flags
= 0;
338 no_addr
= idev
->ifa_list
== NULL
;
340 fl4
.flowi4_mark
= IN_DEV_SRC_VMARK(idev
) ? skb
->mark
: 0;
342 trace_fib_validate_source(dev
, &fl4
);
345 if (fib_lookup(net
, &fl4
, &res
, 0))
347 if (res
.type
!= RTN_UNICAST
&&
348 (res
.type
!= RTN_LOCAL
|| !IN_DEV_ACCEPT_LOCAL(idev
)))
350 if (!rpf
&& !fib_num_tclassid_users(dev_net(dev
)) &&
351 (dev
->ifindex
!= oif
|| !IN_DEV_TX_REDIRECTS(idev
)))
353 fib_combine_itag(itag
, &res
);
356 #ifdef CONFIG_IP_ROUTE_MULTIPATH
357 for (ret
= 0; ret
< res
.fi
->fib_nhs
; ret
++) {
358 struct fib_nh
*nh
= &res
.fi
->fib_nh
[ret
];
360 if (nh
->nh_dev
== dev
) {
363 } else if (l3mdev_master_ifindex_rcu(nh
->nh_dev
) == dev
->ifindex
) {
369 if (FIB_RES_DEV(res
) == dev
)
373 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
380 fl4
.flowi4_oif
= dev
->ifindex
;
383 if (fib_lookup(net
, &fl4
, &res
, FIB_LOOKUP_IGNORE_LINKSTATE
) == 0) {
384 if (res
.type
== RTN_UNICAST
)
385 ret
= FIB_RES_NH(res
).nh_scope
>= RT_SCOPE_HOST
;
401 /* Ignore rp_filter for packets protected by IPsec. */
402 int fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
403 u8 tos
, int oif
, struct net_device
*dev
,
404 struct in_device
*idev
, u32
*itag
)
406 int r
= secpath_exists(skb
) ? 0 : IN_DEV_RPFILTER(idev
);
408 if (!r
&& !fib_num_tclassid_users(dev_net(dev
)) &&
409 IN_DEV_ACCEPT_LOCAL(idev
) &&
410 (dev
->ifindex
!= oif
|| !IN_DEV_TX_REDIRECTS(idev
))) {
414 return __fib_validate_source(skb
, src
, dst
, tos
, oif
, dev
, r
, idev
, itag
);
417 static inline __be32
sk_extract_addr(struct sockaddr
*addr
)
419 return ((struct sockaddr_in
*) addr
)->sin_addr
.s_addr
;
422 static int put_rtax(struct nlattr
*mx
, int len
, int type
, u32 value
)
426 nla
= (struct nlattr
*) ((char *) mx
+ len
);
427 nla
->nla_type
= type
;
428 nla
->nla_len
= nla_attr_size(4);
429 *(u32
*) nla_data(nla
) = value
;
431 return len
+ nla_total_size(4);
434 static int rtentry_to_fib_config(struct net
*net
, int cmd
, struct rtentry
*rt
,
435 struct fib_config
*cfg
)
440 memset(cfg
, 0, sizeof(*cfg
));
441 cfg
->fc_nlinfo
.nl_net
= net
;
443 if (rt
->rt_dst
.sa_family
!= AF_INET
)
444 return -EAFNOSUPPORT
;
447 * Check mask for validity:
448 * a) it must be contiguous.
449 * b) destination must have all host bits clear.
450 * c) if application forgot to set correct family (AF_INET),
451 * reject request unless it is absolutely clear i.e.
452 * both family and mask are zero.
455 addr
= sk_extract_addr(&rt
->rt_dst
);
456 if (!(rt
->rt_flags
& RTF_HOST
)) {
457 __be32 mask
= sk_extract_addr(&rt
->rt_genmask
);
459 if (rt
->rt_genmask
.sa_family
!= AF_INET
) {
460 if (mask
|| rt
->rt_genmask
.sa_family
)
461 return -EAFNOSUPPORT
;
464 if (bad_mask(mask
, addr
))
467 plen
= inet_mask_len(mask
);
470 cfg
->fc_dst_len
= plen
;
473 if (cmd
!= SIOCDELRT
) {
474 cfg
->fc_nlflags
= NLM_F_CREATE
;
475 cfg
->fc_protocol
= RTPROT_BOOT
;
479 cfg
->fc_priority
= rt
->rt_metric
- 1;
481 if (rt
->rt_flags
& RTF_REJECT
) {
482 cfg
->fc_scope
= RT_SCOPE_HOST
;
483 cfg
->fc_type
= RTN_UNREACHABLE
;
487 cfg
->fc_scope
= RT_SCOPE_NOWHERE
;
488 cfg
->fc_type
= RTN_UNICAST
;
492 struct net_device
*dev
;
493 char devname
[IFNAMSIZ
];
495 if (copy_from_user(devname
, rt
->rt_dev
, IFNAMSIZ
-1))
498 devname
[IFNAMSIZ
-1] = 0;
499 colon
= strchr(devname
, ':');
502 dev
= __dev_get_by_name(net
, devname
);
505 cfg
->fc_oif
= dev
->ifindex
;
506 cfg
->fc_table
= l3mdev_fib_table(dev
);
508 struct in_ifaddr
*ifa
;
509 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
513 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
)
514 if (strcmp(ifa
->ifa_label
, devname
) == 0)
518 cfg
->fc_prefsrc
= ifa
->ifa_local
;
522 addr
= sk_extract_addr(&rt
->rt_gateway
);
523 if (rt
->rt_gateway
.sa_family
== AF_INET
&& addr
) {
524 unsigned int addr_type
;
527 addr_type
= inet_addr_type_table(net
, addr
, cfg
->fc_table
);
528 if (rt
->rt_flags
& RTF_GATEWAY
&&
529 addr_type
== RTN_UNICAST
)
530 cfg
->fc_scope
= RT_SCOPE_UNIVERSE
;
533 if (cmd
== SIOCDELRT
)
536 if (rt
->rt_flags
& RTF_GATEWAY
&& !cfg
->fc_gw
)
539 if (cfg
->fc_scope
== RT_SCOPE_NOWHERE
)
540 cfg
->fc_scope
= RT_SCOPE_LINK
;
542 if (rt
->rt_flags
& (RTF_MTU
| RTF_WINDOW
| RTF_IRTT
)) {
546 mx
= kzalloc(3 * nla_total_size(4), GFP_KERNEL
);
550 if (rt
->rt_flags
& RTF_MTU
)
551 len
= put_rtax(mx
, len
, RTAX_ADVMSS
, rt
->rt_mtu
- 40);
553 if (rt
->rt_flags
& RTF_WINDOW
)
554 len
= put_rtax(mx
, len
, RTAX_WINDOW
, rt
->rt_window
);
556 if (rt
->rt_flags
& RTF_IRTT
)
557 len
= put_rtax(mx
, len
, RTAX_RTT
, rt
->rt_irtt
<< 3);
560 cfg
->fc_mx_len
= len
;
567 * Handle IP routing ioctl calls.
568 * These are used to manipulate the routing tables
570 int ip_rt_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
572 struct fib_config cfg
;
577 case SIOCADDRT
: /* Add a route */
578 case SIOCDELRT
: /* Delete a route */
579 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
582 if (copy_from_user(&rt
, arg
, sizeof(rt
)))
586 err
= rtentry_to_fib_config(net
, cmd
, &rt
, &cfg
);
588 struct fib_table
*tb
;
590 if (cmd
== SIOCDELRT
) {
591 tb
= fib_get_table(net
, cfg
.fc_table
);
593 err
= fib_table_delete(tb
, &cfg
);
597 tb
= fib_new_table(net
, cfg
.fc_table
);
599 err
= fib_table_insert(tb
, &cfg
);
604 /* allocated by rtentry_to_fib_config() */
613 const struct nla_policy rtm_ipv4_policy
[RTA_MAX
+ 1] = {
614 [RTA_DST
] = { .type
= NLA_U32
},
615 [RTA_SRC
] = { .type
= NLA_U32
},
616 [RTA_IIF
] = { .type
= NLA_U32
},
617 [RTA_OIF
] = { .type
= NLA_U32
},
618 [RTA_GATEWAY
] = { .type
= NLA_U32
},
619 [RTA_PRIORITY
] = { .type
= NLA_U32
},
620 [RTA_PREFSRC
] = { .type
= NLA_U32
},
621 [RTA_METRICS
] = { .type
= NLA_NESTED
},
622 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
623 [RTA_FLOW
] = { .type
= NLA_U32
},
624 [RTA_ENCAP_TYPE
] = { .type
= NLA_U16
},
625 [RTA_ENCAP
] = { .type
= NLA_NESTED
},
628 static int rtm_to_fib_config(struct net
*net
, struct sk_buff
*skb
,
629 struct nlmsghdr
*nlh
, struct fib_config
*cfg
)
635 err
= nlmsg_validate(nlh
, sizeof(*rtm
), RTA_MAX
, rtm_ipv4_policy
);
639 memset(cfg
, 0, sizeof(*cfg
));
641 rtm
= nlmsg_data(nlh
);
642 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
643 cfg
->fc_tos
= rtm
->rtm_tos
;
644 cfg
->fc_table
= rtm
->rtm_table
;
645 cfg
->fc_protocol
= rtm
->rtm_protocol
;
646 cfg
->fc_scope
= rtm
->rtm_scope
;
647 cfg
->fc_type
= rtm
->rtm_type
;
648 cfg
->fc_flags
= rtm
->rtm_flags
;
649 cfg
->fc_nlflags
= nlh
->nlmsg_flags
;
651 cfg
->fc_nlinfo
.portid
= NETLINK_CB(skb
).portid
;
652 cfg
->fc_nlinfo
.nlh
= nlh
;
653 cfg
->fc_nlinfo
.nl_net
= net
;
655 if (cfg
->fc_type
> RTN_MAX
) {
660 nlmsg_for_each_attr(attr
, nlh
, sizeof(struct rtmsg
), remaining
) {
661 switch (nla_type(attr
)) {
663 cfg
->fc_dst
= nla_get_be32(attr
);
666 cfg
->fc_oif
= nla_get_u32(attr
);
669 cfg
->fc_gw
= nla_get_be32(attr
);
672 cfg
->fc_priority
= nla_get_u32(attr
);
675 cfg
->fc_prefsrc
= nla_get_be32(attr
);
678 cfg
->fc_mx
= nla_data(attr
);
679 cfg
->fc_mx_len
= nla_len(attr
);
682 cfg
->fc_mp
= nla_data(attr
);
683 cfg
->fc_mp_len
= nla_len(attr
);
686 cfg
->fc_flow
= nla_get_u32(attr
);
689 cfg
->fc_table
= nla_get_u32(attr
);
692 cfg
->fc_encap
= attr
;
695 cfg
->fc_encap_type
= nla_get_u16(attr
);
705 static int inet_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
707 struct net
*net
= sock_net(skb
->sk
);
708 struct fib_config cfg
;
709 struct fib_table
*tb
;
712 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
716 tb
= fib_get_table(net
, cfg
.fc_table
);
722 err
= fib_table_delete(tb
, &cfg
);
727 static int inet_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
729 struct net
*net
= sock_net(skb
->sk
);
730 struct fib_config cfg
;
731 struct fib_table
*tb
;
734 err
= rtm_to_fib_config(net
, skb
, nlh
, &cfg
);
738 tb
= fib_new_table(net
, cfg
.fc_table
);
744 err
= fib_table_insert(tb
, &cfg
);
749 static int inet_dump_fib(struct sk_buff
*skb
, struct netlink_callback
*cb
)
751 struct net
*net
= sock_net(skb
->sk
);
753 unsigned int e
= 0, s_e
;
754 struct fib_table
*tb
;
755 struct hlist_head
*head
;
758 if (nlmsg_len(cb
->nlh
) >= sizeof(struct rtmsg
) &&
759 ((struct rtmsg
*) nlmsg_data(cb
->nlh
))->rtm_flags
& RTM_F_CLONED
)
767 for (h
= s_h
; h
< FIB_TABLE_HASHSZ
; h
++, s_e
= 0) {
769 head
= &net
->ipv4
.fib_table_hash
[h
];
770 hlist_for_each_entry_rcu(tb
, head
, tb_hlist
) {
774 memset(&cb
->args
[2], 0, sizeof(cb
->args
) -
775 2 * sizeof(cb
->args
[0]));
776 if (fib_table_dump(tb
, skb
, cb
) < 0)
792 /* Prepare and feed intra-kernel routing request.
793 * Really, it should be netlink message, but :-( netlink
794 * can be not configured, so that we feed it directly
795 * to fib engine. It is legal, because all events occur
796 * only when netlink is already locked.
798 static void fib_magic(int cmd
, int type
, __be32 dst
, int dst_len
, struct in_ifaddr
*ifa
)
800 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
801 u32 tb_id
= l3mdev_fib_table(ifa
->ifa_dev
->dev
);
802 struct fib_table
*tb
;
803 struct fib_config cfg
= {
804 .fc_protocol
= RTPROT_KERNEL
,
807 .fc_dst_len
= dst_len
,
808 .fc_prefsrc
= ifa
->ifa_local
,
809 .fc_oif
= ifa
->ifa_dev
->dev
->ifindex
,
810 .fc_nlflags
= NLM_F_CREATE
| NLM_F_APPEND
,
817 tb_id
= (type
== RTN_UNICAST
) ? RT_TABLE_MAIN
: RT_TABLE_LOCAL
;
819 tb
= fib_new_table(net
, tb_id
);
823 cfg
.fc_table
= tb
->tb_id
;
825 if (type
!= RTN_LOCAL
)
826 cfg
.fc_scope
= RT_SCOPE_LINK
;
828 cfg
.fc_scope
= RT_SCOPE_HOST
;
830 if (cmd
== RTM_NEWROUTE
)
831 fib_table_insert(tb
, &cfg
);
833 fib_table_delete(tb
, &cfg
);
836 void fib_add_ifaddr(struct in_ifaddr
*ifa
)
838 struct in_device
*in_dev
= ifa
->ifa_dev
;
839 struct net_device
*dev
= in_dev
->dev
;
840 struct in_ifaddr
*prim
= ifa
;
841 __be32 mask
= ifa
->ifa_mask
;
842 __be32 addr
= ifa
->ifa_local
;
843 __be32 prefix
= ifa
->ifa_address
& mask
;
845 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
846 prim
= inet_ifa_byprefix(in_dev
, prefix
, mask
);
848 pr_warn("%s: bug: prim == NULL\n", __func__
);
853 fib_magic(RTM_NEWROUTE
, RTN_LOCAL
, addr
, 32, prim
);
855 if (!(dev
->flags
& IFF_UP
))
858 /* Add broadcast address, if it is explicitly assigned. */
859 if (ifa
->ifa_broadcast
&& ifa
->ifa_broadcast
!= htonl(0xFFFFFFFF))
860 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
862 if (!ipv4_is_zeronet(prefix
) && !(ifa
->ifa_flags
& IFA_F_SECONDARY
) &&
863 (prefix
!= addr
|| ifa
->ifa_prefixlen
< 32)) {
864 if (!(ifa
->ifa_flags
& IFA_F_NOPREFIXROUTE
))
865 fib_magic(RTM_NEWROUTE
,
866 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
867 prefix
, ifa
->ifa_prefixlen
, prim
);
869 /* Add network specific broadcasts, when it takes a sense */
870 if (ifa
->ifa_prefixlen
< 31) {
871 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
, 32, prim
);
872 fib_magic(RTM_NEWROUTE
, RTN_BROADCAST
, prefix
| ~mask
,
878 /* Delete primary or secondary address.
879 * Optionally, on secondary address promotion consider the addresses
880 * from subnet iprim as deleted, even if they are in device list.
881 * In this case the secondary ifa can be in device list.
883 void fib_del_ifaddr(struct in_ifaddr
*ifa
, struct in_ifaddr
*iprim
)
885 struct in_device
*in_dev
= ifa
->ifa_dev
;
886 struct net_device
*dev
= in_dev
->dev
;
887 struct in_ifaddr
*ifa1
;
888 struct in_ifaddr
*prim
= ifa
, *prim1
= NULL
;
889 __be32 brd
= ifa
->ifa_address
| ~ifa
->ifa_mask
;
890 __be32 any
= ifa
->ifa_address
& ifa
->ifa_mask
;
896 int subnet
= 0; /* Primary network */
897 int gone
= 1; /* Address is missing */
898 int same_prefsrc
= 0; /* Another primary with same IP */
900 if (ifa
->ifa_flags
& IFA_F_SECONDARY
) {
901 prim
= inet_ifa_byprefix(in_dev
, any
, ifa
->ifa_mask
);
903 /* if the device has been deleted, we don't perform
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 if (!(ifa
->ifa_flags
& IFA_F_NOPREFIXROUTE
))
917 fib_magic(RTM_DELROUTE
,
918 dev
->flags
& IFF_LOOPBACK
? RTN_LOCAL
: RTN_UNICAST
,
919 any
, ifa
->ifa_prefixlen
, prim
);
926 /* Deletion is more complicated than add.
927 * We should take care of not to delete too much :-)
929 * Scan address list to be sure that addresses are really gone.
932 for (ifa1
= in_dev
->ifa_list
; ifa1
; ifa1
= ifa1
->ifa_next
) {
934 /* promotion, keep the IP */
938 /* Ignore IFAs from our subnet */
939 if (iprim
&& ifa1
->ifa_mask
== iprim
->ifa_mask
&&
940 inet_ifa_match(ifa1
->ifa_address
, iprim
))
943 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
944 if (ifa1
->ifa_flags
& IFA_F_SECONDARY
) {
945 /* Another address from our subnet? */
946 if (ifa1
->ifa_mask
== prim
->ifa_mask
&&
947 inet_ifa_match(ifa1
->ifa_address
, prim
))
950 /* We reached the secondaries, so
951 * same_prefsrc should be determined.
955 /* Search new prim1 if ifa1 is not
956 * using the current prim1
959 ifa1
->ifa_mask
!= prim1
->ifa_mask
||
960 !inet_ifa_match(ifa1
->ifa_address
, prim1
))
961 prim1
= inet_ifa_byprefix(in_dev
,
966 if (prim1
->ifa_local
!= prim
->ifa_local
)
970 if (prim
->ifa_local
!= ifa1
->ifa_local
)
976 if (ifa
->ifa_local
== ifa1
->ifa_local
)
978 if (ifa
->ifa_broadcast
== ifa1
->ifa_broadcast
)
980 if (brd
== ifa1
->ifa_broadcast
)
982 if (any
== ifa1
->ifa_broadcast
)
984 /* primary has network specific broadcasts */
985 if (prim1
== ifa1
&& ifa1
->ifa_prefixlen
< 31) {
986 __be32 brd1
= ifa1
->ifa_address
| ~ifa1
->ifa_mask
;
987 __be32 any1
= ifa1
->ifa_address
& ifa1
->ifa_mask
;
989 if (!ipv4_is_zeronet(any1
)) {
990 if (ifa
->ifa_broadcast
== brd1
||
991 ifa
->ifa_broadcast
== any1
)
993 if (brd
== brd1
|| brd
== any1
)
995 if (any
== brd1
|| any
== any1
)
1003 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, ifa
->ifa_broadcast
, 32, prim
);
1004 if (subnet
&& ifa
->ifa_prefixlen
< 31) {
1005 if (!(ok
& BRD1_OK
))
1006 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, brd
, 32, prim
);
1007 if (!(ok
& BRD0_OK
))
1008 fib_magic(RTM_DELROUTE
, RTN_BROADCAST
, any
, 32, prim
);
1010 if (!(ok
& LOCAL_OK
)) {
1011 unsigned int addr_type
;
1013 fib_magic(RTM_DELROUTE
, RTN_LOCAL
, ifa
->ifa_local
, 32, prim
);
1015 /* Check, that this local address finally disappeared. */
1016 addr_type
= inet_addr_type_dev_table(dev_net(dev
), dev
,
1018 if (gone
&& addr_type
!= RTN_LOCAL
) {
1019 /* And the last, but not the least thing.
1020 * We must flush stray FIB entries.
1022 * First of all, we scan fib_info list searching
1023 * for stray nexthop entries, then ignite fib_flush.
1025 if (fib_sync_down_addr(dev
, ifa
->ifa_local
))
1026 fib_flush(dev_net(dev
));
1035 static void nl_fib_lookup(struct net
*net
, struct fib_result_nl
*frn
)
1038 struct fib_result res
;
1039 struct flowi4 fl4
= {
1040 .flowi4_mark
= frn
->fl_mark
,
1041 .daddr
= frn
->fl_addr
,
1042 .flowi4_tos
= frn
->fl_tos
,
1043 .flowi4_scope
= frn
->fl_scope
,
1045 struct fib_table
*tb
;
1049 tb
= fib_get_table(net
, frn
->tb_id_in
);
1055 frn
->tb_id
= tb
->tb_id
;
1056 frn
->err
= fib_table_lookup(tb
, &fl4
, &res
, FIB_LOOKUP_NOREF
);
1059 frn
->prefixlen
= res
.prefixlen
;
1060 frn
->nh_sel
= res
.nh_sel
;
1061 frn
->type
= res
.type
;
1062 frn
->scope
= res
.scope
;
1070 static void nl_fib_input(struct sk_buff
*skb
)
1073 struct fib_result_nl
*frn
;
1074 struct nlmsghdr
*nlh
;
1077 net
= sock_net(skb
->sk
);
1078 nlh
= nlmsg_hdr(skb
);
1079 if (skb
->len
< NLMSG_HDRLEN
|| skb
->len
< nlh
->nlmsg_len
||
1080 nlmsg_len(nlh
) < sizeof(*frn
))
1083 skb
= netlink_skb_clone(skb
, GFP_KERNEL
);
1086 nlh
= nlmsg_hdr(skb
);
1088 frn
= (struct fib_result_nl
*) nlmsg_data(nlh
);
1089 nl_fib_lookup(net
, frn
);
1091 portid
= NETLINK_CB(skb
).portid
; /* netlink portid */
1092 NETLINK_CB(skb
).portid
= 0; /* from kernel */
1093 NETLINK_CB(skb
).dst_group
= 0; /* unicast */
1094 netlink_unicast(net
->ipv4
.fibnl
, skb
, portid
, MSG_DONTWAIT
);
1097 static int __net_init
nl_fib_lookup_init(struct net
*net
)
1100 struct netlink_kernel_cfg cfg
= {
1101 .input
= nl_fib_input
,
1104 sk
= netlink_kernel_create(net
, NETLINK_FIB_LOOKUP
, &cfg
);
1106 return -EAFNOSUPPORT
;
1107 net
->ipv4
.fibnl
= sk
;
1111 static void nl_fib_lookup_exit(struct net
*net
)
1113 netlink_kernel_release(net
->ipv4
.fibnl
);
1114 net
->ipv4
.fibnl
= NULL
;
1117 static void fib_disable_ip(struct net_device
*dev
, unsigned long event
,
1120 if (fib_sync_down_dev(dev
, event
, force
))
1121 fib_flush(dev_net(dev
));
1122 rt_cache_flush(dev_net(dev
));
1126 static int fib_inetaddr_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1128 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
1129 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
1130 struct net
*net
= dev_net(dev
);
1134 fib_add_ifaddr(ifa
);
1135 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1136 fib_sync_up(dev
, RTNH_F_DEAD
);
1138 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1139 rt_cache_flush(dev_net(dev
));
1142 fib_del_ifaddr(ifa
, NULL
);
1143 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1144 if (!ifa
->ifa_dev
->ifa_list
) {
1145 /* Last address was deleted from this interface.
1148 fib_disable_ip(dev
, event
, true);
1150 rt_cache_flush(dev_net(dev
));
1157 static int fib_netdev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1159 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1160 struct netdev_notifier_changeupper_info
*info
;
1161 struct in_device
*in_dev
;
1162 struct net
*net
= dev_net(dev
);
1165 if (event
== NETDEV_UNREGISTER
) {
1166 fib_disable_ip(dev
, event
, true);
1171 in_dev
= __in_dev_get_rtnl(dev
);
1178 fib_add_ifaddr(ifa
);
1179 } endfor_ifa(in_dev
);
1180 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1181 fib_sync_up(dev
, RTNH_F_DEAD
);
1183 atomic_inc(&net
->ipv4
.dev_addr_genid
);
1184 rt_cache_flush(net
);
1187 fib_disable_ip(dev
, event
, false);
1190 flags
= dev_get_flags(dev
);
1191 if (flags
& (IFF_RUNNING
| IFF_LOWER_UP
))
1192 fib_sync_up(dev
, RTNH_F_LINKDOWN
);
1194 fib_sync_down_dev(dev
, event
, false);
1196 case NETDEV_CHANGEMTU
:
1197 rt_cache_flush(net
);
1199 case NETDEV_CHANGEUPPER
:
1201 /* flush all routes if dev is linked to or unlinked from
1202 * an L3 master device (e.g., VRF)
1204 if (info
->upper_dev
&& netif_is_l3_master(info
->upper_dev
))
1205 fib_disable_ip(dev
, NETDEV_DOWN
, true);
1211 static struct notifier_block fib_inetaddr_notifier
= {
1212 .notifier_call
= fib_inetaddr_event
,
1215 static struct notifier_block fib_netdev_notifier
= {
1216 .notifier_call
= fib_netdev_event
,
1219 static int __net_init
ip_fib_net_init(struct net
*net
)
1222 size_t size
= sizeof(struct hlist_head
) * FIB_TABLE_HASHSZ
;
1224 /* Avoid false sharing : Use at least a full cache line */
1225 size
= max_t(size_t, size
, L1_CACHE_BYTES
);
1227 net
->ipv4
.fib_table_hash
= kzalloc(size
, GFP_KERNEL
);
1228 if (!net
->ipv4
.fib_table_hash
)
1231 err
= fib4_rules_init(net
);
1237 kfree(net
->ipv4
.fib_table_hash
);
1241 static void ip_fib_net_exit(struct net
*net
)
1246 #ifdef CONFIG_IP_MULTIPLE_TABLES
1247 RCU_INIT_POINTER(net
->ipv4
.fib_main
, NULL
);
1248 RCU_INIT_POINTER(net
->ipv4
.fib_default
, NULL
);
1250 for (i
= 0; i
< FIB_TABLE_HASHSZ
; i
++) {
1251 struct hlist_head
*head
= &net
->ipv4
.fib_table_hash
[i
];
1252 struct hlist_node
*tmp
;
1253 struct fib_table
*tb
;
1255 hlist_for_each_entry_safe(tb
, tmp
, head
, tb_hlist
) {
1256 hlist_del(&tb
->tb_hlist
);
1257 fib_table_flush(tb
);
1262 #ifdef CONFIG_IP_MULTIPLE_TABLES
1263 fib4_rules_exit(net
);
1266 kfree(net
->ipv4
.fib_table_hash
);
1269 static int __net_init
fib_net_init(struct net
*net
)
1273 #ifdef CONFIG_IP_ROUTE_CLASSID
1274 net
->ipv4
.fib_num_tclassid_users
= 0;
1276 error
= ip_fib_net_init(net
);
1279 error
= nl_fib_lookup_init(net
);
1282 error
= fib_proc_init(net
);
1289 nl_fib_lookup_exit(net
);
1291 ip_fib_net_exit(net
);
1295 static void __net_exit
fib_net_exit(struct net
*net
)
1298 nl_fib_lookup_exit(net
);
1299 ip_fib_net_exit(net
);
1302 static struct pernet_operations fib_net_ops
= {
1303 .init
= fib_net_init
,
1304 .exit
= fib_net_exit
,
1307 void __init
ip_fib_init(void)
1309 rtnl_register(PF_INET
, RTM_NEWROUTE
, inet_rtm_newroute
, NULL
, NULL
);
1310 rtnl_register(PF_INET
, RTM_DELROUTE
, inet_rtm_delroute
, NULL
, NULL
);
1311 rtnl_register(PF_INET
, RTM_GETROUTE
, NULL
, inet_dump_fib
, NULL
);
1313 register_pernet_subsys(&fib_net_ops
);
1314 register_netdevice_notifier(&fib_netdev_notifier
);
1315 register_inetaddr_notifier(&fib_inetaddr_notifier
);