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);
63 static struct sock *rtnl;
67 mutex_lock(&rtnl_mutex);
70 void __rtnl_unlock(void)
72 mutex_unlock(&rtnl_mutex);
75 void rtnl_unlock(void)
77 mutex_unlock(&rtnl_mutex);
81 int rtnl_trylock(void)
83 return mutex_trylock(&rtnl_mutex);
86 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
88 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
90 while (RTA_OK(rta, len)) {
91 unsigned flavor = rta->rta_type;
92 if (flavor && flavor <= maxattr)
94 rta = RTA_NEXT(rta, len);
99 int __rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
100 struct rtattr *rta, int len)
102 if (RTA_PAYLOAD(rta) < len)
104 if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
105 rta = RTA_DATA(rta) + RTA_ALIGN(len);
106 return rtattr_parse_nested(tb, maxattr, rta);
108 memset(tb, 0, sizeof(struct rtattr *) * maxattr);
112 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
114 static inline int rtm_msgindex(int msgtype)
116 int msgindex = msgtype - RTM_BASE;
119 * msgindex < 0 implies someone tried to register a netlink
120 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
121 * the message type has not been added to linux/rtnetlink.h
123 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
128 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
130 struct rtnl_link *tab;
132 tab = rtnl_msg_handlers[protocol];
133 if (tab == NULL || tab[msgindex].doit == NULL)
134 tab = rtnl_msg_handlers[PF_UNSPEC];
136 return tab ? tab[msgindex].doit : NULL;
139 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
141 struct rtnl_link *tab;
143 tab = rtnl_msg_handlers[protocol];
144 if (tab == NULL || tab[msgindex].dumpit == NULL)
145 tab = rtnl_msg_handlers[PF_UNSPEC];
147 return tab ? tab[msgindex].dumpit : NULL;
151 * __rtnl_register - Register a rtnetlink message type
152 * @protocol: Protocol family or PF_UNSPEC
153 * @msgtype: rtnetlink message type
154 * @doit: Function pointer called for each request message
155 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
157 * Registers the specified function pointers (at least one of them has
158 * to be non-NULL) to be called whenever a request message for the
159 * specified protocol family and message type is received.
161 * The special protocol family PF_UNSPEC may be used to define fallback
162 * function pointers for the case when no entry for the specific protocol
165 * Returns 0 on success or a negative error code.
167 int __rtnl_register(int protocol, int msgtype,
168 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
170 struct rtnl_link *tab;
173 BUG_ON(protocol < 0 || protocol >= NPROTO);
174 msgindex = rtm_msgindex(msgtype);
176 tab = rtnl_msg_handlers[protocol];
178 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
182 rtnl_msg_handlers[protocol] = tab;
186 tab[msgindex].doit = doit;
189 tab[msgindex].dumpit = dumpit;
194 EXPORT_SYMBOL_GPL(__rtnl_register);
197 * rtnl_register - Register a rtnetlink message type
199 * Identical to __rtnl_register() but panics on failure. This is useful
200 * as failure of this function is very unlikely, it can only happen due
201 * to lack of memory when allocating the chain to store all message
202 * handlers for a protocol. Meant for use in init functions where lack
203 * of memory implies no sense in continueing.
205 void rtnl_register(int protocol, int msgtype,
206 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
208 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
209 panic("Unable to register rtnetlink message handler, "
210 "protocol = %d, message type = %d\n",
214 EXPORT_SYMBOL_GPL(rtnl_register);
217 * rtnl_unregister - Unregister a rtnetlink message type
218 * @protocol: Protocol family or PF_UNSPEC
219 * @msgtype: rtnetlink message type
221 * Returns 0 on success or a negative error code.
223 int rtnl_unregister(int protocol, int msgtype)
227 BUG_ON(protocol < 0 || protocol >= NPROTO);
228 msgindex = rtm_msgindex(msgtype);
230 if (rtnl_msg_handlers[protocol] == NULL)
233 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
234 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
239 EXPORT_SYMBOL_GPL(rtnl_unregister);
242 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
243 * @protocol : Protocol family or PF_UNSPEC
245 * Identical to calling rtnl_unregster() for all registered message types
246 * of a certain protocol family.
248 void rtnl_unregister_all(int protocol)
250 BUG_ON(protocol < 0 || protocol >= NPROTO);
252 kfree(rtnl_msg_handlers[protocol]);
253 rtnl_msg_handlers[protocol] = NULL;
256 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
258 static LIST_HEAD(link_ops);
261 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
262 * @ops: struct rtnl_link_ops * to register
264 * The caller must hold the rtnl_mutex. This function should be used
265 * by drivers that create devices during module initialization. It
266 * must be called before registering the devices.
268 * Returns 0 on success or a negative error code.
270 int __rtnl_link_register(struct rtnl_link_ops *ops)
273 ops->dellink = unregister_netdevice;
275 list_add_tail(&ops->list, &link_ops);
279 EXPORT_SYMBOL_GPL(__rtnl_link_register);
282 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
283 * @ops: struct rtnl_link_ops * to register
285 * Returns 0 on success or a negative error code.
287 int rtnl_link_register(struct rtnl_link_ops *ops)
292 err = __rtnl_link_register(ops);
297 EXPORT_SYMBOL_GPL(rtnl_link_register);
300 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
301 * @ops: struct rtnl_link_ops * to unregister
303 * The caller must hold the rtnl_mutex.
305 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
307 struct net_device *dev, *n;
311 for_each_netdev_safe(net, dev, n) {
312 if (dev->rtnl_link_ops == ops)
316 list_del(&ops->list);
319 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
322 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
323 * @ops: struct rtnl_link_ops * to unregister
325 void rtnl_link_unregister(struct rtnl_link_ops *ops)
328 __rtnl_link_unregister(ops);
332 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
334 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
336 const struct rtnl_link_ops *ops;
338 list_for_each_entry(ops, &link_ops, list) {
339 if (!strcmp(ops->kind, kind))
345 static size_t rtnl_link_get_size(const struct net_device *dev)
347 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
353 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
354 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
357 /* IFLA_INFO_DATA + nested data */
358 size += nlmsg_total_size(sizeof(struct nlattr)) +
361 if (ops->get_xstats_size)
362 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
367 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
369 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
370 struct nlattr *linkinfo, *data;
373 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
374 if (linkinfo == NULL)
377 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
378 goto err_cancel_link;
379 if (ops->fill_xstats) {
380 err = ops->fill_xstats(skb, dev);
382 goto err_cancel_link;
384 if (ops->fill_info) {
385 data = nla_nest_start(skb, IFLA_INFO_DATA);
387 goto err_cancel_link;
388 err = ops->fill_info(skb, dev);
390 goto err_cancel_data;
391 nla_nest_end(skb, data);
394 nla_nest_end(skb, linkinfo);
398 nla_nest_cancel(skb, data);
400 nla_nest_cancel(skb, linkinfo);
405 static const int rtm_min[RTM_NR_FAMILIES] =
407 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
408 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
409 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
410 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
411 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
412 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
413 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
414 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
415 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
416 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
419 static const int rta_max[RTM_NR_FAMILIES] =
421 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
422 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
423 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
424 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
425 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
426 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
427 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
428 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
431 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
434 int size = RTA_LENGTH(attrlen);
436 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
437 rta->rta_type = attrtype;
439 memcpy(RTA_DATA(rta), data, attrlen);
440 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
443 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
445 size_t ret = RTA_PAYLOAD(rta);
446 char *src = RTA_DATA(rta);
448 if (ret > 0 && src[ret - 1] == '\0')
451 size_t len = (ret >= size) ? size - 1 : ret;
452 memset(dest, 0, size);
453 memcpy(dest, src, len);
458 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
462 NETLINK_CB(skb).dst_group = group;
464 atomic_inc(&skb->users);
465 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
467 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
471 int rtnl_unicast(struct sk_buff *skb, u32 pid)
473 return nlmsg_unicast(rtnl, skb, pid);
476 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
477 struct nlmsghdr *nlh, gfp_t flags)
482 report = nlmsg_report(nlh);
484 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
487 void rtnl_set_sk_err(u32 group, int error)
489 netlink_set_err(rtnl, 0, group, error);
492 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
497 mx = nla_nest_start(skb, RTA_METRICS);
501 for (i = 0; i < RTAX_MAX; i++) {
504 NLA_PUT_U32(skb, i+1, metrics[i]);
509 nla_nest_cancel(skb, mx);
513 return nla_nest_end(skb, mx);
516 return nla_nest_cancel(skb, mx);
519 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
520 u32 ts, u32 tsage, long expires, u32 error)
522 struct rta_cacheinfo ci = {
523 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
524 .rta_used = dst->__use,
525 .rta_clntref = atomic_read(&(dst->__refcnt)),
533 ci.rta_expires = jiffies_to_clock_t(expires);
535 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
538 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
540 static void set_operstate(struct net_device *dev, unsigned char transition)
542 unsigned char operstate = dev->operstate;
546 if ((operstate == IF_OPER_DORMANT ||
547 operstate == IF_OPER_UNKNOWN) &&
549 operstate = IF_OPER_UP;
552 case IF_OPER_DORMANT:
553 if (operstate == IF_OPER_UP ||
554 operstate == IF_OPER_UNKNOWN)
555 operstate = IF_OPER_DORMANT;
559 if (dev->operstate != operstate) {
560 write_lock_bh(&dev_base_lock);
561 dev->operstate = operstate;
562 write_unlock_bh(&dev_base_lock);
563 netdev_state_change(dev);
567 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
568 struct net_device_stats *b)
570 a->rx_packets = b->rx_packets;
571 a->tx_packets = b->tx_packets;
572 a->rx_bytes = b->rx_bytes;
573 a->tx_bytes = b->tx_bytes;
574 a->rx_errors = b->rx_errors;
575 a->tx_errors = b->tx_errors;
576 a->rx_dropped = b->rx_dropped;
577 a->tx_dropped = b->tx_dropped;
579 a->multicast = b->multicast;
580 a->collisions = b->collisions;
582 a->rx_length_errors = b->rx_length_errors;
583 a->rx_over_errors = b->rx_over_errors;
584 a->rx_crc_errors = b->rx_crc_errors;
585 a->rx_frame_errors = b->rx_frame_errors;
586 a->rx_fifo_errors = b->rx_fifo_errors;
587 a->rx_missed_errors = b->rx_missed_errors;
589 a->tx_aborted_errors = b->tx_aborted_errors;
590 a->tx_carrier_errors = b->tx_carrier_errors;
591 a->tx_fifo_errors = b->tx_fifo_errors;
592 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
593 a->tx_window_errors = b->tx_window_errors;
595 a->rx_compressed = b->rx_compressed;
596 a->tx_compressed = b->tx_compressed;
599 static inline size_t if_nlmsg_size(const struct net_device *dev)
601 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
602 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
603 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
604 + nla_total_size(sizeof(struct rtnl_link_ifmap))
605 + nla_total_size(sizeof(struct rtnl_link_stats))
606 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
607 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
608 + nla_total_size(4) /* IFLA_TXQLEN */
609 + nla_total_size(4) /* IFLA_WEIGHT */
610 + nla_total_size(4) /* IFLA_MTU */
611 + nla_total_size(4) /* IFLA_LINK */
612 + nla_total_size(4) /* IFLA_MASTER */
613 + nla_total_size(1) /* IFLA_OPERSTATE */
614 + nla_total_size(1) /* IFLA_LINKMODE */
615 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
618 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
619 int type, u32 pid, u32 seq, u32 change,
622 struct ifinfomsg *ifm;
623 struct nlmsghdr *nlh;
625 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
629 ifm = nlmsg_data(nlh);
630 ifm->ifi_family = AF_UNSPEC;
632 ifm->ifi_type = dev->type;
633 ifm->ifi_index = dev->ifindex;
634 ifm->ifi_flags = dev_get_flags(dev);
635 ifm->ifi_change = change;
637 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
638 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
639 NLA_PUT_U8(skb, IFLA_OPERSTATE,
640 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
641 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
642 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
644 if (dev->ifindex != dev->iflink)
645 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
648 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
650 if (dev->qdisc_sleeping)
651 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
654 struct rtnl_link_ifmap map = {
655 .mem_start = dev->mem_start,
656 .mem_end = dev->mem_end,
657 .base_addr = dev->base_addr,
660 .port = dev->if_port,
662 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
666 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
667 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
670 if (dev->get_stats) {
671 struct net_device_stats *stats = dev->get_stats(dev);
675 attr = nla_reserve(skb, IFLA_STATS,
676 sizeof(struct rtnl_link_stats));
678 goto nla_put_failure;
680 copy_rtnl_link_stats(nla_data(attr), stats);
684 if (dev->rtnl_link_ops) {
685 if (rtnl_link_fill(skb, dev) < 0)
686 goto nla_put_failure;
689 return nlmsg_end(skb, nlh);
692 nlmsg_cancel(skb, nlh);
696 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
698 struct net *net = skb->sk->sk_net;
700 int s_idx = cb->args[0];
701 struct net_device *dev;
704 for_each_netdev(net, dev) {
707 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
708 NETLINK_CB(cb->skb).pid,
709 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
719 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
720 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
721 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
722 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
723 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
724 [IFLA_MTU] = { .type = NLA_U32 },
725 [IFLA_TXQLEN] = { .type = NLA_U32 },
726 [IFLA_WEIGHT] = { .type = NLA_U32 },
727 [IFLA_OPERSTATE] = { .type = NLA_U8 },
728 [IFLA_LINKMODE] = { .type = NLA_U8 },
729 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
732 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
733 [IFLA_INFO_KIND] = { .type = NLA_STRING },
734 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
737 static struct net *get_net_ns_by_pid(pid_t pid)
739 struct task_struct *tsk;
742 /* Lookup the network namespace */
743 net = ERR_PTR(-ESRCH);
745 tsk = find_task_by_vpid(pid);
747 struct nsproxy *nsproxy;
748 nsproxy = task_nsproxy(tsk);
750 net = get_net(nsproxy->net_ns);
756 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
757 struct nlattr **tb, char *ifname, int modified)
759 int send_addr_notify = 0;
762 if (tb[IFLA_NET_NS_PID]) {
764 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
769 err = dev_change_net_namespace(dev, net, ifname);
777 struct rtnl_link_ifmap *u_map;
780 if (!dev->set_config) {
785 if (!netif_device_present(dev)) {
790 u_map = nla_data(tb[IFLA_MAP]);
791 k_map.mem_start = (unsigned long) u_map->mem_start;
792 k_map.mem_end = (unsigned long) u_map->mem_end;
793 k_map.base_addr = (unsigned short) u_map->base_addr;
794 k_map.irq = (unsigned char) u_map->irq;
795 k_map.dma = (unsigned char) u_map->dma;
796 k_map.port = (unsigned char) u_map->port;
798 err = dev->set_config(dev, &k_map);
805 if (tb[IFLA_ADDRESS]) {
809 if (!dev->set_mac_address) {
814 if (!netif_device_present(dev)) {
819 len = sizeof(sa_family_t) + dev->addr_len;
820 sa = kmalloc(len, GFP_KERNEL);
825 sa->sa_family = dev->type;
826 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
828 err = dev->set_mac_address(dev, sa);
832 send_addr_notify = 1;
837 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
844 * Interface selected by interface index but interface
845 * name provided implies that a name change has been
848 if (ifm->ifi_index > 0 && ifname[0]) {
849 err = dev_change_name(dev, ifname);
855 if (tb[IFLA_BROADCAST]) {
856 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
857 send_addr_notify = 1;
860 if (ifm->ifi_flags || ifm->ifi_change) {
861 unsigned int flags = ifm->ifi_flags;
863 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
865 flags = (flags & ifm->ifi_change) |
866 (dev->flags & ~ifm->ifi_change);
867 dev_change_flags(dev, flags);
871 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
873 if (tb[IFLA_OPERSTATE])
874 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
876 if (tb[IFLA_LINKMODE]) {
877 write_lock_bh(&dev_base_lock);
878 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
879 write_unlock_bh(&dev_base_lock);
885 if (err < 0 && modified && net_ratelimit())
886 printk(KERN_WARNING "A link change request failed with "
887 "some changes comitted already. Interface %s may "
888 "have been left with an inconsistent configuration, "
889 "please check.\n", dev->name);
891 if (send_addr_notify)
892 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
896 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
898 struct net *net = skb->sk->sk_net;
899 struct ifinfomsg *ifm;
900 struct net_device *dev;
902 struct nlattr *tb[IFLA_MAX+1];
903 char ifname[IFNAMSIZ];
905 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
910 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
915 ifm = nlmsg_data(nlh);
916 if (ifm->ifi_index > 0)
917 dev = dev_get_by_index(net, ifm->ifi_index);
918 else if (tb[IFLA_IFNAME])
919 dev = dev_get_by_name(net, ifname);
928 if (tb[IFLA_ADDRESS] &&
929 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
932 if (tb[IFLA_BROADCAST] &&
933 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
936 err = do_setlink(dev, ifm, tb, ifname, 0);
943 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
945 struct net *net = skb->sk->sk_net;
946 const struct rtnl_link_ops *ops;
947 struct net_device *dev;
948 struct ifinfomsg *ifm;
949 char ifname[IFNAMSIZ];
950 struct nlattr *tb[IFLA_MAX+1];
953 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
958 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
960 ifm = nlmsg_data(nlh);
961 if (ifm->ifi_index > 0)
962 dev = __dev_get_by_index(net, ifm->ifi_index);
963 else if (tb[IFLA_IFNAME])
964 dev = __dev_get_by_name(net, ifname);
971 ops = dev->rtnl_link_ops;
979 struct net_device *rtnl_create_link(struct net *net, char *ifname,
980 const struct rtnl_link_ops *ops, struct nlattr *tb[])
983 struct net_device *dev;
986 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
990 if (strchr(dev->name, '%')) {
991 err = dev_alloc_name(dev, dev->name);
997 dev->rtnl_link_ops = ops;
1000 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1001 if (tb[IFLA_ADDRESS])
1002 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1003 nla_len(tb[IFLA_ADDRESS]));
1004 if (tb[IFLA_BROADCAST])
1005 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1006 nla_len(tb[IFLA_BROADCAST]));
1007 if (tb[IFLA_TXQLEN])
1008 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1009 if (tb[IFLA_OPERSTATE])
1010 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1011 if (tb[IFLA_LINKMODE])
1012 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1019 return ERR_PTR(err);
1022 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1024 struct net *net = skb->sk->sk_net;
1025 const struct rtnl_link_ops *ops;
1026 struct net_device *dev;
1027 struct ifinfomsg *ifm;
1028 char kind[MODULE_NAME_LEN];
1029 char ifname[IFNAMSIZ];
1030 struct nlattr *tb[IFLA_MAX+1];
1031 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1037 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1041 if (tb[IFLA_IFNAME])
1042 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1046 ifm = nlmsg_data(nlh);
1047 if (ifm->ifi_index > 0)
1048 dev = __dev_get_by_index(net, ifm->ifi_index);
1050 dev = __dev_get_by_name(net, ifname);
1054 if (tb[IFLA_LINKINFO]) {
1055 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1056 tb[IFLA_LINKINFO], ifla_info_policy);
1060 memset(linkinfo, 0, sizeof(linkinfo));
1062 if (linkinfo[IFLA_INFO_KIND]) {
1063 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1064 ops = rtnl_link_ops_get(kind);
1071 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1074 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1075 err = nla_parse_nested(attr, ops->maxtype,
1076 linkinfo[IFLA_INFO_DATA],
1082 if (ops->validate) {
1083 err = ops->validate(tb, data);
1092 if (nlh->nlmsg_flags & NLM_F_EXCL)
1094 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1097 if (linkinfo[IFLA_INFO_DATA]) {
1098 if (!ops || ops != dev->rtnl_link_ops ||
1102 err = ops->changelink(dev, tb, data);
1108 return do_setlink(dev, ifm, tb, ifname, modified);
1111 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1114 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1116 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1123 request_module("rtnl-link-%s", kind);
1125 ops = rtnl_link_ops_get(kind);
1134 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1136 dev = rtnl_create_link(net, ifname, ops, tb);
1140 else if (ops->newlink)
1141 err = ops->newlink(dev, tb, data);
1143 err = register_netdevice(dev);
1145 if (err < 0 && !IS_ERR(dev))
1151 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1153 struct net *net = skb->sk->sk_net;
1154 struct ifinfomsg *ifm;
1155 struct nlattr *tb[IFLA_MAX+1];
1156 struct net_device *dev = NULL;
1157 struct sk_buff *nskb;
1160 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1164 ifm = nlmsg_data(nlh);
1165 if (ifm->ifi_index > 0) {
1166 dev = dev_get_by_index(net, ifm->ifi_index);
1172 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1178 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1179 nlh->nlmsg_seq, 0, 0);
1181 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1182 WARN_ON(err == -EMSGSIZE);
1186 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
1193 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1196 int s_idx = cb->family;
1200 for (idx=1; idx<NPROTO; idx++) {
1201 int type = cb->nlh->nlmsg_type-RTM_BASE;
1202 if (idx < s_idx || idx == PF_PACKET)
1204 if (rtnl_msg_handlers[idx] == NULL ||
1205 rtnl_msg_handlers[idx][type].dumpit == NULL)
1208 memset(&cb->args[0], 0, sizeof(cb->args));
1209 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1217 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1219 struct sk_buff *skb;
1222 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1226 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1228 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1229 WARN_ON(err == -EMSGSIZE);
1233 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1236 rtnl_set_sk_err(RTNLGRP_LINK, err);
1239 /* Protected by RTNL sempahore. */
1240 static struct rtattr **rta_buf;
1241 static int rtattr_max;
1243 /* Process one rtnetlink message. */
1245 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1247 rtnl_doit_func doit;
1254 type = nlh->nlmsg_type;
1260 /* All the messages must have at least 1 byte length */
1261 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1264 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1265 if (family >= NPROTO)
1266 return -EAFNOSUPPORT;
1271 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1274 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1275 rtnl_dumpit_func dumpit;
1277 dumpit = rtnl_get_dumpit(family, type);
1282 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1287 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1289 min_len = rtm_min[sz_idx];
1290 if (nlh->nlmsg_len < min_len)
1293 if (nlh->nlmsg_len > min_len) {
1294 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1295 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1297 while (RTA_OK(attr, attrlen)) {
1298 unsigned flavor = attr->rta_type;
1300 if (flavor > rta_max[sz_idx])
1302 rta_buf[flavor-1] = attr;
1304 attr = RTA_NEXT(attr, attrlen);
1308 doit = rtnl_get_doit(family, type);
1312 return doit(skb, nlh, (void *)&rta_buf[0]);
1315 static void rtnetlink_rcv(struct sk_buff *skb)
1318 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1322 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1324 struct net_device *dev = ptr;
1326 if (dev->nd_net != &init_net)
1330 case NETDEV_UNREGISTER:
1331 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1333 case NETDEV_REGISTER:
1334 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1338 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1341 case NETDEV_GOING_DOWN:
1344 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1350 static struct notifier_block rtnetlink_dev_notifier = {
1351 .notifier_call = rtnetlink_event,
1354 void __init rtnetlink_init(void)
1359 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1360 if (rta_max[i] > rtattr_max)
1361 rtattr_max = rta_max[i];
1362 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1364 panic("rtnetlink_init: cannot allocate rta_buf\n");
1366 rtnl = netlink_kernel_create(&init_net, NETLINK_ROUTE, RTNLGRP_MAX,
1367 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1369 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1370 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1371 register_netdevice_notifier(&rtnetlink_dev_notifier);
1373 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1374 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1375 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1376 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1378 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1379 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1382 EXPORT_SYMBOL(__rta_fill);
1383 EXPORT_SYMBOL(rtattr_strlcpy);
1384 EXPORT_SYMBOL(rtattr_parse);
1385 EXPORT_SYMBOL(__rtattr_parse_nested_compat);
1386 EXPORT_SYMBOL(rtnetlink_put_metrics);
1387 EXPORT_SYMBOL(rtnl_lock);
1388 EXPORT_SYMBOL(rtnl_trylock);
1389 EXPORT_SYMBOL(rtnl_unlock);
1390 EXPORT_SYMBOL(rtnl_unicast);
1391 EXPORT_SYMBOL(rtnl_notify);
1392 EXPORT_SYMBOL(rtnl_set_sk_err);
1393 EXPORT_SYMBOL(rtnl_create_link);
1394 EXPORT_SYMBOL(ifla_policy);