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 * Routing netlink socket interface: protocol independent part.
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 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/nsproxy.h>
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42 #include <asm/string.h>
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
47 #include <net/protocol.h>
49 #include <net/route.h>
52 #include <net/pkt_sched.h>
53 #include <net/fib_rules.h>
54 #include <net/rtnetlink.h>
59 rtnl_dumpit_func dumpit
;
62 static DEFINE_MUTEX(rtnl_mutex
);
66 mutex_lock(&rtnl_mutex
);
69 void __rtnl_unlock(void)
71 mutex_unlock(&rtnl_mutex
);
74 void rtnl_unlock(void)
76 mutex_unlock(&rtnl_mutex
);
80 int rtnl_trylock(void)
82 return mutex_trylock(&rtnl_mutex
);
85 static struct rtnl_link
*rtnl_msg_handlers
[NPROTO
];
87 static inline int rtm_msgindex(int msgtype
)
89 int msgindex
= msgtype
- RTM_BASE
;
92 * msgindex < 0 implies someone tried to register a netlink
93 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
94 * the message type has not been added to linux/rtnetlink.h
96 BUG_ON(msgindex
< 0 || msgindex
>= RTM_NR_MSGTYPES
);
101 static rtnl_doit_func
rtnl_get_doit(int protocol
, int msgindex
)
103 struct rtnl_link
*tab
;
105 tab
= rtnl_msg_handlers
[protocol
];
106 if (tab
== NULL
|| tab
[msgindex
].doit
== NULL
)
107 tab
= rtnl_msg_handlers
[PF_UNSPEC
];
109 return tab
? tab
[msgindex
].doit
: NULL
;
112 static rtnl_dumpit_func
rtnl_get_dumpit(int protocol
, int msgindex
)
114 struct rtnl_link
*tab
;
116 tab
= rtnl_msg_handlers
[protocol
];
117 if (tab
== NULL
|| tab
[msgindex
].dumpit
== NULL
)
118 tab
= rtnl_msg_handlers
[PF_UNSPEC
];
120 return tab
? tab
[msgindex
].dumpit
: NULL
;
124 * __rtnl_register - Register a rtnetlink message type
125 * @protocol: Protocol family or PF_UNSPEC
126 * @msgtype: rtnetlink message type
127 * @doit: Function pointer called for each request message
128 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
130 * Registers the specified function pointers (at least one of them has
131 * to be non-NULL) to be called whenever a request message for the
132 * specified protocol family and message type is received.
134 * The special protocol family PF_UNSPEC may be used to define fallback
135 * function pointers for the case when no entry for the specific protocol
138 * Returns 0 on success or a negative error code.
140 int __rtnl_register(int protocol
, int msgtype
,
141 rtnl_doit_func doit
, rtnl_dumpit_func dumpit
)
143 struct rtnl_link
*tab
;
146 BUG_ON(protocol
< 0 || protocol
>= NPROTO
);
147 msgindex
= rtm_msgindex(msgtype
);
149 tab
= rtnl_msg_handlers
[protocol
];
151 tab
= kcalloc(RTM_NR_MSGTYPES
, sizeof(*tab
), GFP_KERNEL
);
155 rtnl_msg_handlers
[protocol
] = tab
;
159 tab
[msgindex
].doit
= doit
;
162 tab
[msgindex
].dumpit
= dumpit
;
167 EXPORT_SYMBOL_GPL(__rtnl_register
);
170 * rtnl_register - Register a rtnetlink message type
172 * Identical to __rtnl_register() but panics on failure. This is useful
173 * as failure of this function is very unlikely, it can only happen due
174 * to lack of memory when allocating the chain to store all message
175 * handlers for a protocol. Meant for use in init functions where lack
176 * of memory implies no sense in continueing.
178 void rtnl_register(int protocol
, int msgtype
,
179 rtnl_doit_func doit
, rtnl_dumpit_func dumpit
)
181 if (__rtnl_register(protocol
, msgtype
, doit
, dumpit
) < 0)
182 panic("Unable to register rtnetlink message handler, "
183 "protocol = %d, message type = %d\n",
187 EXPORT_SYMBOL_GPL(rtnl_register
);
190 * rtnl_unregister - Unregister a rtnetlink message type
191 * @protocol: Protocol family or PF_UNSPEC
192 * @msgtype: rtnetlink message type
194 * Returns 0 on success or a negative error code.
196 int rtnl_unregister(int protocol
, int msgtype
)
200 BUG_ON(protocol
< 0 || protocol
>= NPROTO
);
201 msgindex
= rtm_msgindex(msgtype
);
203 if (rtnl_msg_handlers
[protocol
] == NULL
)
206 rtnl_msg_handlers
[protocol
][msgindex
].doit
= NULL
;
207 rtnl_msg_handlers
[protocol
][msgindex
].dumpit
= NULL
;
212 EXPORT_SYMBOL_GPL(rtnl_unregister
);
215 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
216 * @protocol : Protocol family or PF_UNSPEC
218 * Identical to calling rtnl_unregster() for all registered message types
219 * of a certain protocol family.
221 void rtnl_unregister_all(int protocol
)
223 BUG_ON(protocol
< 0 || protocol
>= NPROTO
);
225 kfree(rtnl_msg_handlers
[protocol
]);
226 rtnl_msg_handlers
[protocol
] = NULL
;
229 EXPORT_SYMBOL_GPL(rtnl_unregister_all
);
231 static LIST_HEAD(link_ops
);
234 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
235 * @ops: struct rtnl_link_ops * to register
237 * The caller must hold the rtnl_mutex. This function should be used
238 * by drivers that create devices during module initialization. It
239 * must be called before registering the devices.
241 * Returns 0 on success or a negative error code.
243 int __rtnl_link_register(struct rtnl_link_ops
*ops
)
246 ops
->dellink
= unregister_netdevice
;
248 list_add_tail(&ops
->list
, &link_ops
);
252 EXPORT_SYMBOL_GPL(__rtnl_link_register
);
255 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
256 * @ops: struct rtnl_link_ops * to register
258 * Returns 0 on success or a negative error code.
260 int rtnl_link_register(struct rtnl_link_ops
*ops
)
265 err
= __rtnl_link_register(ops
);
270 EXPORT_SYMBOL_GPL(rtnl_link_register
);
273 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
274 * @ops: struct rtnl_link_ops * to unregister
276 * The caller must hold the rtnl_mutex.
278 void __rtnl_link_unregister(struct rtnl_link_ops
*ops
)
280 struct net_device
*dev
, *n
;
285 for_each_netdev_safe(net
, dev
, n
) {
286 if (dev
->rtnl_link_ops
== ops
) {
292 list_del(&ops
->list
);
295 EXPORT_SYMBOL_GPL(__rtnl_link_unregister
);
298 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
299 * @ops: struct rtnl_link_ops * to unregister
301 void rtnl_link_unregister(struct rtnl_link_ops
*ops
)
304 __rtnl_link_unregister(ops
);
308 EXPORT_SYMBOL_GPL(rtnl_link_unregister
);
310 static const struct rtnl_link_ops
*rtnl_link_ops_get(const char *kind
)
312 const struct rtnl_link_ops
*ops
;
314 list_for_each_entry(ops
, &link_ops
, list
) {
315 if (!strcmp(ops
->kind
, kind
))
321 static size_t rtnl_link_get_size(const struct net_device
*dev
)
323 const struct rtnl_link_ops
*ops
= dev
->rtnl_link_ops
;
329 size
= nlmsg_total_size(sizeof(struct nlattr
)) + /* IFLA_LINKINFO */
330 nlmsg_total_size(strlen(ops
->kind
) + 1); /* IFLA_INFO_KIND */
333 /* IFLA_INFO_DATA + nested data */
334 size
+= nlmsg_total_size(sizeof(struct nlattr
)) +
337 if (ops
->get_xstats_size
)
338 size
+= ops
->get_xstats_size(dev
); /* IFLA_INFO_XSTATS */
343 static int rtnl_link_fill(struct sk_buff
*skb
, const struct net_device
*dev
)
345 const struct rtnl_link_ops
*ops
= dev
->rtnl_link_ops
;
346 struct nlattr
*linkinfo
, *data
;
349 linkinfo
= nla_nest_start(skb
, IFLA_LINKINFO
);
350 if (linkinfo
== NULL
)
353 if (nla_put_string(skb
, IFLA_INFO_KIND
, ops
->kind
) < 0)
354 goto err_cancel_link
;
355 if (ops
->fill_xstats
) {
356 err
= ops
->fill_xstats(skb
, dev
);
358 goto err_cancel_link
;
360 if (ops
->fill_info
) {
361 data
= nla_nest_start(skb
, IFLA_INFO_DATA
);
363 goto err_cancel_link
;
364 err
= ops
->fill_info(skb
, dev
);
366 goto err_cancel_data
;
367 nla_nest_end(skb
, data
);
370 nla_nest_end(skb
, linkinfo
);
374 nla_nest_cancel(skb
, data
);
376 nla_nest_cancel(skb
, linkinfo
);
381 static const int rtm_min
[RTM_NR_FAMILIES
] =
383 [RTM_FAM(RTM_NEWLINK
)] = NLMSG_LENGTH(sizeof(struct ifinfomsg
)),
384 [RTM_FAM(RTM_NEWADDR
)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg
)),
385 [RTM_FAM(RTM_NEWROUTE
)] = NLMSG_LENGTH(sizeof(struct rtmsg
)),
386 [RTM_FAM(RTM_NEWRULE
)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr
)),
387 [RTM_FAM(RTM_NEWQDISC
)] = NLMSG_LENGTH(sizeof(struct tcmsg
)),
388 [RTM_FAM(RTM_NEWTCLASS
)] = NLMSG_LENGTH(sizeof(struct tcmsg
)),
389 [RTM_FAM(RTM_NEWTFILTER
)] = NLMSG_LENGTH(sizeof(struct tcmsg
)),
390 [RTM_FAM(RTM_NEWACTION
)] = NLMSG_LENGTH(sizeof(struct tcamsg
)),
391 [RTM_FAM(RTM_GETMULTICAST
)] = NLMSG_LENGTH(sizeof(struct rtgenmsg
)),
392 [RTM_FAM(RTM_GETANYCAST
)] = NLMSG_LENGTH(sizeof(struct rtgenmsg
)),
395 static const int rta_max
[RTM_NR_FAMILIES
] =
397 [RTM_FAM(RTM_NEWLINK
)] = IFLA_MAX
,
398 [RTM_FAM(RTM_NEWADDR
)] = IFA_MAX
,
399 [RTM_FAM(RTM_NEWROUTE
)] = RTA_MAX
,
400 [RTM_FAM(RTM_NEWRULE
)] = FRA_MAX
,
401 [RTM_FAM(RTM_NEWQDISC
)] = TCA_MAX
,
402 [RTM_FAM(RTM_NEWTCLASS
)] = TCA_MAX
,
403 [RTM_FAM(RTM_NEWTFILTER
)] = TCA_MAX
,
404 [RTM_FAM(RTM_NEWACTION
)] = TCAA_MAX
,
407 void __rta_fill(struct sk_buff
*skb
, int attrtype
, int attrlen
, const void *data
)
410 int size
= RTA_LENGTH(attrlen
);
412 rta
= (struct rtattr
*)skb_put(skb
, RTA_ALIGN(size
));
413 rta
->rta_type
= attrtype
;
415 memcpy(RTA_DATA(rta
), data
, attrlen
);
416 memset(RTA_DATA(rta
) + attrlen
, 0, RTA_ALIGN(size
) - size
);
419 int rtnetlink_send(struct sk_buff
*skb
, struct net
*net
, u32 pid
, unsigned group
, int echo
)
421 struct sock
*rtnl
= net
->rtnl
;
424 NETLINK_CB(skb
).dst_group
= group
;
426 atomic_inc(&skb
->users
);
427 netlink_broadcast(rtnl
, skb
, pid
, group
, GFP_KERNEL
);
429 err
= netlink_unicast(rtnl
, skb
, pid
, MSG_DONTWAIT
);
433 int rtnl_unicast(struct sk_buff
*skb
, struct net
*net
, u32 pid
)
435 struct sock
*rtnl
= net
->rtnl
;
437 return nlmsg_unicast(rtnl
, skb
, pid
);
440 int rtnl_notify(struct sk_buff
*skb
, struct net
*net
, u32 pid
, u32 group
,
441 struct nlmsghdr
*nlh
, gfp_t flags
)
443 struct sock
*rtnl
= net
->rtnl
;
447 report
= nlmsg_report(nlh
);
449 return nlmsg_notify(rtnl
, skb
, pid
, group
, report
, flags
);
452 void rtnl_set_sk_err(struct net
*net
, u32 group
, int error
)
454 struct sock
*rtnl
= net
->rtnl
;
456 netlink_set_err(rtnl
, 0, group
, error
);
459 int rtnetlink_put_metrics(struct sk_buff
*skb
, u32
*metrics
)
464 mx
= nla_nest_start(skb
, RTA_METRICS
);
468 for (i
= 0; i
< RTAX_MAX
; i
++) {
471 NLA_PUT_U32(skb
, i
+1, metrics
[i
]);
476 nla_nest_cancel(skb
, mx
);
480 return nla_nest_end(skb
, mx
);
483 return nla_nest_cancel(skb
, mx
);
486 int rtnl_put_cacheinfo(struct sk_buff
*skb
, struct dst_entry
*dst
, u32 id
,
487 u32 ts
, u32 tsage
, long expires
, u32 error
)
489 struct rta_cacheinfo ci
= {
490 .rta_lastuse
= jiffies_to_clock_t(jiffies
- dst
->lastuse
),
491 .rta_used
= dst
->__use
,
492 .rta_clntref
= atomic_read(&(dst
->__refcnt
)),
500 ci
.rta_expires
= jiffies_to_clock_t(expires
);
502 return nla_put(skb
, RTA_CACHEINFO
, sizeof(ci
), &ci
);
505 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo
);
507 static int set_operstate(struct net_device
*dev
, unsigned char transition
, bool send_notification
)
509 unsigned char operstate
= dev
->operstate
;
513 if ((operstate
== IF_OPER_DORMANT
||
514 operstate
== IF_OPER_UNKNOWN
) &&
516 operstate
= IF_OPER_UP
;
519 case IF_OPER_DORMANT
:
520 if (operstate
== IF_OPER_UP
||
521 operstate
== IF_OPER_UNKNOWN
)
522 operstate
= IF_OPER_DORMANT
;
526 if (dev
->operstate
!= operstate
) {
527 write_lock_bh(&dev_base_lock
);
528 dev
->operstate
= operstate
;
529 write_unlock_bh(&dev_base_lock
);
531 if (send_notification
)
532 netdev_state_change(dev
);
538 static void copy_rtnl_link_stats(struct rtnl_link_stats
*a
,
539 struct net_device_stats
*b
)
541 a
->rx_packets
= b
->rx_packets
;
542 a
->tx_packets
= b
->tx_packets
;
543 a
->rx_bytes
= b
->rx_bytes
;
544 a
->tx_bytes
= b
->tx_bytes
;
545 a
->rx_errors
= b
->rx_errors
;
546 a
->tx_errors
= b
->tx_errors
;
547 a
->rx_dropped
= b
->rx_dropped
;
548 a
->tx_dropped
= b
->tx_dropped
;
550 a
->multicast
= b
->multicast
;
551 a
->collisions
= b
->collisions
;
553 a
->rx_length_errors
= b
->rx_length_errors
;
554 a
->rx_over_errors
= b
->rx_over_errors
;
555 a
->rx_crc_errors
= b
->rx_crc_errors
;
556 a
->rx_frame_errors
= b
->rx_frame_errors
;
557 a
->rx_fifo_errors
= b
->rx_fifo_errors
;
558 a
->rx_missed_errors
= b
->rx_missed_errors
;
560 a
->tx_aborted_errors
= b
->tx_aborted_errors
;
561 a
->tx_carrier_errors
= b
->tx_carrier_errors
;
562 a
->tx_fifo_errors
= b
->tx_fifo_errors
;
563 a
->tx_heartbeat_errors
= b
->tx_heartbeat_errors
;
564 a
->tx_window_errors
= b
->tx_window_errors
;
566 a
->rx_compressed
= b
->rx_compressed
;
567 a
->tx_compressed
= b
->tx_compressed
;
570 static inline size_t if_nlmsg_size(const struct net_device
*dev
)
572 return NLMSG_ALIGN(sizeof(struct ifinfomsg
))
573 + nla_total_size(IFNAMSIZ
) /* IFLA_IFNAME */
574 + nla_total_size(IFNAMSIZ
) /* IFLA_QDISC */
575 + nla_total_size(sizeof(struct rtnl_link_ifmap
))
576 + nla_total_size(sizeof(struct rtnl_link_stats
))
577 + nla_total_size(MAX_ADDR_LEN
) /* IFLA_ADDRESS */
578 + nla_total_size(MAX_ADDR_LEN
) /* IFLA_BROADCAST */
579 + nla_total_size(4) /* IFLA_TXQLEN */
580 + nla_total_size(4) /* IFLA_WEIGHT */
581 + nla_total_size(4) /* IFLA_MTU */
582 + nla_total_size(4) /* IFLA_LINK */
583 + nla_total_size(4) /* IFLA_MASTER */
584 + nla_total_size(1) /* IFLA_OPERSTATE */
585 + nla_total_size(1) /* IFLA_LINKMODE */
586 + rtnl_link_get_size(dev
); /* IFLA_LINKINFO */
589 static int rtnl_fill_ifinfo(struct sk_buff
*skb
, struct net_device
*dev
,
590 int type
, u32 pid
, u32 seq
, u32 change
,
593 struct ifinfomsg
*ifm
;
594 struct nlmsghdr
*nlh
;
596 nlh
= nlmsg_put(skb
, pid
, seq
, type
, sizeof(*ifm
), flags
);
600 ifm
= nlmsg_data(nlh
);
601 ifm
->ifi_family
= AF_UNSPEC
;
603 ifm
->ifi_type
= dev
->type
;
604 ifm
->ifi_index
= dev
->ifindex
;
605 ifm
->ifi_flags
= dev_get_flags(dev
);
606 ifm
->ifi_change
= change
;
608 NLA_PUT_STRING(skb
, IFLA_IFNAME
, dev
->name
);
609 NLA_PUT_U32(skb
, IFLA_TXQLEN
, dev
->tx_queue_len
);
610 NLA_PUT_U8(skb
, IFLA_OPERSTATE
,
611 netif_running(dev
) ? dev
->operstate
: IF_OPER_DOWN
);
612 NLA_PUT_U8(skb
, IFLA_LINKMODE
, dev
->link_mode
);
613 NLA_PUT_U32(skb
, IFLA_MTU
, dev
->mtu
);
615 if (dev
->ifindex
!= dev
->iflink
)
616 NLA_PUT_U32(skb
, IFLA_LINK
, dev
->iflink
);
619 NLA_PUT_U32(skb
, IFLA_MASTER
, dev
->master
->ifindex
);
621 if (dev
->qdisc_sleeping
)
622 NLA_PUT_STRING(skb
, IFLA_QDISC
, dev
->qdisc_sleeping
->ops
->id
);
625 struct rtnl_link_ifmap map
= {
626 .mem_start
= dev
->mem_start
,
627 .mem_end
= dev
->mem_end
,
628 .base_addr
= dev
->base_addr
,
631 .port
= dev
->if_port
,
633 NLA_PUT(skb
, IFLA_MAP
, sizeof(map
), &map
);
637 NLA_PUT(skb
, IFLA_ADDRESS
, dev
->addr_len
, dev
->dev_addr
);
638 NLA_PUT(skb
, IFLA_BROADCAST
, dev
->addr_len
, dev
->broadcast
);
641 if (dev
->get_stats
) {
642 struct net_device_stats
*stats
= dev
->get_stats(dev
);
646 attr
= nla_reserve(skb
, IFLA_STATS
,
647 sizeof(struct rtnl_link_stats
));
649 goto nla_put_failure
;
651 copy_rtnl_link_stats(nla_data(attr
), stats
);
655 if (dev
->rtnl_link_ops
) {
656 if (rtnl_link_fill(skb
, dev
) < 0)
657 goto nla_put_failure
;
660 return nlmsg_end(skb
, nlh
);
663 nlmsg_cancel(skb
, nlh
);
667 static int rtnl_dump_ifinfo(struct sk_buff
*skb
, struct netlink_callback
*cb
)
669 struct net
*net
= skb
->sk
->sk_net
;
671 int s_idx
= cb
->args
[0];
672 struct net_device
*dev
;
675 for_each_netdev(net
, dev
) {
678 if (rtnl_fill_ifinfo(skb
, dev
, RTM_NEWLINK
,
679 NETLINK_CB(cb
->skb
).pid
,
680 cb
->nlh
->nlmsg_seq
, 0, NLM_F_MULTI
) <= 0)
690 const struct nla_policy ifla_policy
[IFLA_MAX
+1] = {
691 [IFLA_IFNAME
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
-1 },
692 [IFLA_ADDRESS
] = { .type
= NLA_BINARY
, .len
= MAX_ADDR_LEN
},
693 [IFLA_BROADCAST
] = { .type
= NLA_BINARY
, .len
= MAX_ADDR_LEN
},
694 [IFLA_MAP
] = { .len
= sizeof(struct rtnl_link_ifmap
) },
695 [IFLA_MTU
] = { .type
= NLA_U32
},
696 [IFLA_TXQLEN
] = { .type
= NLA_U32
},
697 [IFLA_WEIGHT
] = { .type
= NLA_U32
},
698 [IFLA_OPERSTATE
] = { .type
= NLA_U8
},
699 [IFLA_LINKMODE
] = { .type
= NLA_U8
},
700 [IFLA_NET_NS_PID
] = { .type
= NLA_U32
},
703 static const struct nla_policy ifla_info_policy
[IFLA_INFO_MAX
+1] = {
704 [IFLA_INFO_KIND
] = { .type
= NLA_STRING
},
705 [IFLA_INFO_DATA
] = { .type
= NLA_NESTED
},
708 static struct net
*get_net_ns_by_pid(pid_t pid
)
710 struct task_struct
*tsk
;
713 /* Lookup the network namespace */
714 net
= ERR_PTR(-ESRCH
);
716 tsk
= find_task_by_vpid(pid
);
718 struct nsproxy
*nsproxy
;
719 nsproxy
= task_nsproxy(tsk
);
721 net
= get_net(nsproxy
->net_ns
);
727 static int do_setlink(struct net_device
*dev
, struct ifinfomsg
*ifm
,
728 struct nlattr
**tb
, char *ifname
, int modified
)
730 int send_addr_notify
= 0;
733 if (tb
[IFLA_NET_NS_PID
]) {
735 net
= get_net_ns_by_pid(nla_get_u32(tb
[IFLA_NET_NS_PID
]));
740 err
= dev_change_net_namespace(dev
, net
, ifname
);
748 struct rtnl_link_ifmap
*u_map
;
751 if (!dev
->set_config
) {
756 if (!netif_device_present(dev
)) {
761 u_map
= nla_data(tb
[IFLA_MAP
]);
762 k_map
.mem_start
= (unsigned long) u_map
->mem_start
;
763 k_map
.mem_end
= (unsigned long) u_map
->mem_end
;
764 k_map
.base_addr
= (unsigned short) u_map
->base_addr
;
765 k_map
.irq
= (unsigned char) u_map
->irq
;
766 k_map
.dma
= (unsigned char) u_map
->dma
;
767 k_map
.port
= (unsigned char) u_map
->port
;
769 err
= dev
->set_config(dev
, &k_map
);
776 if (tb
[IFLA_ADDRESS
]) {
780 if (!dev
->set_mac_address
) {
785 if (!netif_device_present(dev
)) {
790 len
= sizeof(sa_family_t
) + dev
->addr_len
;
791 sa
= kmalloc(len
, GFP_KERNEL
);
796 sa
->sa_family
= dev
->type
;
797 memcpy(sa
->sa_data
, nla_data(tb
[IFLA_ADDRESS
]),
799 err
= dev
->set_mac_address(dev
, sa
);
803 send_addr_notify
= 1;
808 err
= dev_set_mtu(dev
, nla_get_u32(tb
[IFLA_MTU
]));
815 * Interface selected by interface index but interface
816 * name provided implies that a name change has been
819 if (ifm
->ifi_index
> 0 && ifname
[0]) {
820 err
= dev_change_name(dev
, ifname
);
826 if (tb
[IFLA_BROADCAST
]) {
827 nla_memcpy(dev
->broadcast
, tb
[IFLA_BROADCAST
], dev
->addr_len
);
828 send_addr_notify
= 1;
832 if (ifm
->ifi_flags
|| ifm
->ifi_change
) {
833 unsigned int flags
= ifm
->ifi_flags
;
835 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
837 flags
= (flags
& ifm
->ifi_change
) |
838 (dev
->flags
& ~ifm
->ifi_change
);
839 dev_change_flags(dev
, flags
);
842 if (tb
[IFLA_TXQLEN
]) {
843 if (dev
->tx_queue_len
!= nla_get_u32(tb
[IFLA_TXQLEN
])) {
844 dev
->tx_queue_len
= nla_get_u32(tb
[IFLA_TXQLEN
]);
849 if (tb
[IFLA_OPERSTATE
])
850 modified
|= set_operstate(dev
, nla_get_u8(tb
[IFLA_OPERSTATE
]), false);
852 if (tb
[IFLA_LINKMODE
]) {
853 if (dev
->link_mode
!= nla_get_u8(tb
[IFLA_LINKMODE
])) {
854 write_lock_bh(&dev_base_lock
);
855 dev
->link_mode
= nla_get_u8(tb
[IFLA_LINKMODE
]);
856 write_lock_bh(&dev_base_lock
);
864 if (err
< 0 && modified
&& net_ratelimit())
865 printk(KERN_WARNING
"A link change request failed with "
866 "some changes comitted already. Interface %s may "
867 "have been left with an inconsistent configuration, "
868 "please check.\n", dev
->name
);
870 if (send_addr_notify
)
871 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
874 netdev_state_change(dev
);
879 static int rtnl_setlink(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
881 struct net
*net
= skb
->sk
->sk_net
;
882 struct ifinfomsg
*ifm
;
883 struct net_device
*dev
;
885 struct nlattr
*tb
[IFLA_MAX
+1];
886 char ifname
[IFNAMSIZ
];
888 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFLA_MAX
, ifla_policy
);
893 nla_strlcpy(ifname
, tb
[IFLA_IFNAME
], IFNAMSIZ
);
898 ifm
= nlmsg_data(nlh
);
899 if (ifm
->ifi_index
> 0)
900 dev
= dev_get_by_index(net
, ifm
->ifi_index
);
901 else if (tb
[IFLA_IFNAME
])
902 dev
= dev_get_by_name(net
, ifname
);
911 if (tb
[IFLA_ADDRESS
] &&
912 nla_len(tb
[IFLA_ADDRESS
]) < dev
->addr_len
)
915 if (tb
[IFLA_BROADCAST
] &&
916 nla_len(tb
[IFLA_BROADCAST
]) < dev
->addr_len
)
919 err
= do_setlink(dev
, ifm
, tb
, ifname
, 0);
926 static int rtnl_dellink(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
928 struct net
*net
= skb
->sk
->sk_net
;
929 const struct rtnl_link_ops
*ops
;
930 struct net_device
*dev
;
931 struct ifinfomsg
*ifm
;
932 char ifname
[IFNAMSIZ
];
933 struct nlattr
*tb
[IFLA_MAX
+1];
936 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFLA_MAX
, ifla_policy
);
941 nla_strlcpy(ifname
, tb
[IFLA_IFNAME
], IFNAMSIZ
);
943 ifm
= nlmsg_data(nlh
);
944 if (ifm
->ifi_index
> 0)
945 dev
= __dev_get_by_index(net
, ifm
->ifi_index
);
946 else if (tb
[IFLA_IFNAME
])
947 dev
= __dev_get_by_name(net
, ifname
);
954 ops
= dev
->rtnl_link_ops
;
962 struct net_device
*rtnl_create_link(struct net
*net
, char *ifname
,
963 const struct rtnl_link_ops
*ops
, struct nlattr
*tb
[])
966 struct net_device
*dev
;
969 dev
= alloc_netdev(ops
->priv_size
, ifname
, ops
->setup
);
973 if (strchr(dev
->name
, '%')) {
974 err
= dev_alloc_name(dev
, dev
->name
);
980 dev
->rtnl_link_ops
= ops
;
983 dev
->mtu
= nla_get_u32(tb
[IFLA_MTU
]);
984 if (tb
[IFLA_ADDRESS
])
985 memcpy(dev
->dev_addr
, nla_data(tb
[IFLA_ADDRESS
]),
986 nla_len(tb
[IFLA_ADDRESS
]));
987 if (tb
[IFLA_BROADCAST
])
988 memcpy(dev
->broadcast
, nla_data(tb
[IFLA_BROADCAST
]),
989 nla_len(tb
[IFLA_BROADCAST
]));
991 dev
->tx_queue_len
= nla_get_u32(tb
[IFLA_TXQLEN
]);
992 if (tb
[IFLA_OPERSTATE
])
993 set_operstate(dev
, nla_get_u8(tb
[IFLA_OPERSTATE
]), true);
994 if (tb
[IFLA_LINKMODE
])
995 dev
->link_mode
= nla_get_u8(tb
[IFLA_LINKMODE
]);
1002 return ERR_PTR(err
);
1005 static int rtnl_newlink(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
1007 struct net
*net
= skb
->sk
->sk_net
;
1008 const struct rtnl_link_ops
*ops
;
1009 struct net_device
*dev
;
1010 struct ifinfomsg
*ifm
;
1011 char kind
[MODULE_NAME_LEN
];
1012 char ifname
[IFNAMSIZ
];
1013 struct nlattr
*tb
[IFLA_MAX
+1];
1014 struct nlattr
*linkinfo
[IFLA_INFO_MAX
+1];
1020 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFLA_MAX
, ifla_policy
);
1024 if (tb
[IFLA_IFNAME
])
1025 nla_strlcpy(ifname
, tb
[IFLA_IFNAME
], IFNAMSIZ
);
1029 ifm
= nlmsg_data(nlh
);
1030 if (ifm
->ifi_index
> 0)
1031 dev
= __dev_get_by_index(net
, ifm
->ifi_index
);
1033 dev
= __dev_get_by_name(net
, ifname
);
1037 if (tb
[IFLA_LINKINFO
]) {
1038 err
= nla_parse_nested(linkinfo
, IFLA_INFO_MAX
,
1039 tb
[IFLA_LINKINFO
], ifla_info_policy
);
1043 memset(linkinfo
, 0, sizeof(linkinfo
));
1045 if (linkinfo
[IFLA_INFO_KIND
]) {
1046 nla_strlcpy(kind
, linkinfo
[IFLA_INFO_KIND
], sizeof(kind
));
1047 ops
= rtnl_link_ops_get(kind
);
1054 struct nlattr
*attr
[ops
? ops
->maxtype
+ 1 : 0], **data
= NULL
;
1057 if (ops
->maxtype
&& linkinfo
[IFLA_INFO_DATA
]) {
1058 err
= nla_parse_nested(attr
, ops
->maxtype
,
1059 linkinfo
[IFLA_INFO_DATA
],
1065 if (ops
->validate
) {
1066 err
= ops
->validate(tb
, data
);
1075 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1077 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1080 if (linkinfo
[IFLA_INFO_DATA
]) {
1081 if (!ops
|| ops
!= dev
->rtnl_link_ops
||
1085 err
= ops
->changelink(dev
, tb
, data
);
1091 return do_setlink(dev
, ifm
, tb
, ifname
, modified
);
1094 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
1097 if (ifm
->ifi_index
|| ifm
->ifi_flags
|| ifm
->ifi_change
)
1099 if (tb
[IFLA_MAP
] || tb
[IFLA_MASTER
] || tb
[IFLA_PROTINFO
])
1106 request_module("rtnl-link-%s", kind
);
1108 ops
= rtnl_link_ops_get(kind
);
1117 snprintf(ifname
, IFNAMSIZ
, "%s%%d", ops
->kind
);
1119 dev
= rtnl_create_link(net
, ifname
, ops
, tb
);
1123 else if (ops
->newlink
)
1124 err
= ops
->newlink(dev
, tb
, data
);
1126 err
= register_netdevice(dev
);
1128 if (err
< 0 && !IS_ERR(dev
))
1134 static int rtnl_getlink(struct sk_buff
*skb
, struct nlmsghdr
* nlh
, void *arg
)
1136 struct net
*net
= skb
->sk
->sk_net
;
1137 struct ifinfomsg
*ifm
;
1138 struct nlattr
*tb
[IFLA_MAX
+1];
1139 struct net_device
*dev
= NULL
;
1140 struct sk_buff
*nskb
;
1143 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFLA_MAX
, ifla_policy
);
1147 ifm
= nlmsg_data(nlh
);
1148 if (ifm
->ifi_index
> 0) {
1149 dev
= dev_get_by_index(net
, ifm
->ifi_index
);
1155 nskb
= nlmsg_new(if_nlmsg_size(dev
), GFP_KERNEL
);
1161 err
= rtnl_fill_ifinfo(nskb
, dev
, RTM_NEWLINK
, NETLINK_CB(skb
).pid
,
1162 nlh
->nlmsg_seq
, 0, 0);
1164 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1165 WARN_ON(err
== -EMSGSIZE
);
1169 err
= rtnl_unicast(nskb
, net
, NETLINK_CB(skb
).pid
);
1176 static int rtnl_dump_all(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1179 int s_idx
= cb
->family
;
1183 for (idx
=1; idx
<NPROTO
; idx
++) {
1184 int type
= cb
->nlh
->nlmsg_type
-RTM_BASE
;
1185 if (idx
< s_idx
|| idx
== PF_PACKET
)
1187 if (rtnl_msg_handlers
[idx
] == NULL
||
1188 rtnl_msg_handlers
[idx
][type
].dumpit
== NULL
)
1191 memset(&cb
->args
[0], 0, sizeof(cb
->args
));
1192 if (rtnl_msg_handlers
[idx
][type
].dumpit(skb
, cb
))
1200 void rtmsg_ifinfo(int type
, struct net_device
*dev
, unsigned change
)
1202 struct net
*net
= dev
->nd_net
;
1203 struct sk_buff
*skb
;
1206 skb
= nlmsg_new(if_nlmsg_size(dev
), GFP_KERNEL
);
1210 err
= rtnl_fill_ifinfo(skb
, dev
, type
, 0, 0, change
, 0);
1212 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1213 WARN_ON(err
== -EMSGSIZE
);
1217 err
= rtnl_notify(skb
, net
, 0, RTNLGRP_LINK
, NULL
, GFP_KERNEL
);
1220 rtnl_set_sk_err(net
, RTNLGRP_LINK
, err
);
1223 /* Protected by RTNL sempahore. */
1224 static struct rtattr
**rta_buf
;
1225 static int rtattr_max
;
1227 /* Process one rtnetlink message. */
1229 static int rtnetlink_rcv_msg(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
1231 struct net
*net
= skb
->sk
->sk_net
;
1232 rtnl_doit_func doit
;
1239 type
= nlh
->nlmsg_type
;
1245 /* All the messages must have at least 1 byte length */
1246 if (nlh
->nlmsg_len
< NLMSG_LENGTH(sizeof(struct rtgenmsg
)))
1249 family
= ((struct rtgenmsg
*)NLMSG_DATA(nlh
))->rtgen_family
;
1250 if (family
>= NPROTO
)
1251 return -EAFNOSUPPORT
;
1256 if (kind
!= 2 && security_netlink_recv(skb
, CAP_NET_ADMIN
))
1259 if (kind
== 2 && nlh
->nlmsg_flags
&NLM_F_DUMP
) {
1261 rtnl_dumpit_func dumpit
;
1263 dumpit
= rtnl_get_dumpit(family
, type
);
1269 err
= netlink_dump_start(rtnl
, skb
, nlh
, dumpit
, NULL
);
1274 memset(rta_buf
, 0, (rtattr_max
* sizeof(struct rtattr
*)));
1276 min_len
= rtm_min
[sz_idx
];
1277 if (nlh
->nlmsg_len
< min_len
)
1280 if (nlh
->nlmsg_len
> min_len
) {
1281 int attrlen
= nlh
->nlmsg_len
- NLMSG_ALIGN(min_len
);
1282 struct rtattr
*attr
= (void*)nlh
+ NLMSG_ALIGN(min_len
);
1284 while (RTA_OK(attr
, attrlen
)) {
1285 unsigned flavor
= attr
->rta_type
;
1287 if (flavor
> rta_max
[sz_idx
])
1289 rta_buf
[flavor
-1] = attr
;
1291 attr
= RTA_NEXT(attr
, attrlen
);
1295 doit
= rtnl_get_doit(family
, type
);
1299 return doit(skb
, nlh
, (void *)&rta_buf
[0]);
1302 static void rtnetlink_rcv(struct sk_buff
*skb
)
1305 netlink_rcv_skb(skb
, &rtnetlink_rcv_msg
);
1309 static int rtnetlink_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1311 struct net_device
*dev
= ptr
;
1314 case NETDEV_UNREGISTER
:
1315 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
1317 case NETDEV_REGISTER
:
1318 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
1322 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1325 case NETDEV_GOING_DOWN
:
1328 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1334 static struct notifier_block rtnetlink_dev_notifier
= {
1335 .notifier_call
= rtnetlink_event
,
1339 static int rtnetlink_net_init(struct net
*net
)
1342 sk
= netlink_kernel_create(net
, NETLINK_ROUTE
, RTNLGRP_MAX
,
1343 rtnetlink_rcv
, &rtnl_mutex
, THIS_MODULE
);
1350 static void rtnetlink_net_exit(struct net
*net
)
1352 netlink_kernel_release(net
->rtnl
);
1356 static struct pernet_operations rtnetlink_net_ops
= {
1357 .init
= rtnetlink_net_init
,
1358 .exit
= rtnetlink_net_exit
,
1361 void __init
rtnetlink_init(void)
1366 for (i
= 0; i
< ARRAY_SIZE(rta_max
); i
++)
1367 if (rta_max
[i
] > rtattr_max
)
1368 rtattr_max
= rta_max
[i
];
1369 rta_buf
= kmalloc(rtattr_max
* sizeof(struct rtattr
*), GFP_KERNEL
);
1371 panic("rtnetlink_init: cannot allocate rta_buf\n");
1373 if (register_pernet_subsys(&rtnetlink_net_ops
))
1374 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1376 netlink_set_nonroot(NETLINK_ROUTE
, NL_NONROOT_RECV
);
1377 register_netdevice_notifier(&rtnetlink_dev_notifier
);
1379 rtnl_register(PF_UNSPEC
, RTM_GETLINK
, rtnl_getlink
, rtnl_dump_ifinfo
);
1380 rtnl_register(PF_UNSPEC
, RTM_SETLINK
, rtnl_setlink
, NULL
);
1381 rtnl_register(PF_UNSPEC
, RTM_NEWLINK
, rtnl_newlink
, NULL
);
1382 rtnl_register(PF_UNSPEC
, RTM_DELLINK
, rtnl_dellink
, NULL
);
1384 rtnl_register(PF_UNSPEC
, RTM_GETADDR
, NULL
, rtnl_dump_all
);
1385 rtnl_register(PF_UNSPEC
, RTM_GETROUTE
, NULL
, rtnl_dump_all
);
1388 EXPORT_SYMBOL(__rta_fill
);
1389 EXPORT_SYMBOL(rtnetlink_put_metrics
);
1390 EXPORT_SYMBOL(rtnl_lock
);
1391 EXPORT_SYMBOL(rtnl_trylock
);
1392 EXPORT_SYMBOL(rtnl_unlock
);
1393 EXPORT_SYMBOL(rtnl_unicast
);
1394 EXPORT_SYMBOL(rtnl_notify
);
1395 EXPORT_SYMBOL(rtnl_set_sk_err
);
1396 EXPORT_SYMBOL(rtnl_create_link
);
1397 EXPORT_SYMBOL(ifla_policy
);