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>
39 #include <asm/uaccess.h>
40 #include <asm/system.h>
41 #include <asm/string.h>
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
46 #include <net/protocol.h>
48 #include <net/route.h>
51 #include <net/pkt_sched.h>
52 #include <net/fib_rules.h>
53 #include <net/rtnetlink.h>
58 rtnl_dumpit_func dumpit;
61 static DEFINE_MUTEX(rtnl_mutex);
62 static struct sock *rtnl;
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);
77 if (rtnl && rtnl->sk_receive_queue.qlen)
78 rtnl->sk_data_ready(rtnl, 0);
82 int rtnl_trylock(void)
84 return mutex_trylock(&rtnl_mutex);
87 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
89 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
91 while (RTA_OK(rta, len)) {
92 unsigned flavor = rta->rta_type;
93 if (flavor && flavor <= maxattr)
95 rta = RTA_NEXT(rta, len);
100 int rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
101 struct rtattr *rta, void **data, int len)
103 if (RTA_PAYLOAD(rta) < len)
105 *data = RTA_DATA(rta);
107 if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
108 rta = RTA_DATA(rta) + RTA_ALIGN(len);
109 return rtattr_parse_nested(tb, maxattr, rta);
111 memset(tb, 0, sizeof(struct rtattr *) * maxattr);
115 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
117 static inline int rtm_msgindex(int msgtype)
119 int msgindex = msgtype - RTM_BASE;
122 * msgindex < 0 implies someone tried to register a netlink
123 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
124 * the message type has not been added to linux/rtnetlink.h
126 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
131 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
133 struct rtnl_link *tab;
135 tab = rtnl_msg_handlers[protocol];
136 if (tab == NULL || tab[msgindex].doit == NULL)
137 tab = rtnl_msg_handlers[PF_UNSPEC];
139 return tab ? tab[msgindex].doit : NULL;
142 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
144 struct rtnl_link *tab;
146 tab = rtnl_msg_handlers[protocol];
147 if (tab == NULL || tab[msgindex].dumpit == NULL)
148 tab = rtnl_msg_handlers[PF_UNSPEC];
150 return tab ? tab[msgindex].dumpit : NULL;
154 * __rtnl_register - Register a rtnetlink message type
155 * @protocol: Protocol family or PF_UNSPEC
156 * @msgtype: rtnetlink message type
157 * @doit: Function pointer called for each request message
158 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
160 * Registers the specified function pointers (at least one of them has
161 * to be non-NULL) to be called whenever a request message for the
162 * specified protocol family and message type is received.
164 * The special protocol family PF_UNSPEC may be used to define fallback
165 * function pointers for the case when no entry for the specific protocol
168 * Returns 0 on success or a negative error code.
170 int __rtnl_register(int protocol, int msgtype,
171 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
173 struct rtnl_link *tab;
176 BUG_ON(protocol < 0 || protocol >= NPROTO);
177 msgindex = rtm_msgindex(msgtype);
179 tab = rtnl_msg_handlers[protocol];
181 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
185 rtnl_msg_handlers[protocol] = tab;
189 tab[msgindex].doit = doit;
192 tab[msgindex].dumpit = dumpit;
197 EXPORT_SYMBOL_GPL(__rtnl_register);
200 * rtnl_register - Register a rtnetlink message type
202 * Identical to __rtnl_register() but panics on failure. This is useful
203 * as failure of this function is very unlikely, it can only happen due
204 * to lack of memory when allocating the chain to store all message
205 * handlers for a protocol. Meant for use in init functions where lack
206 * of memory implies no sense in continueing.
208 void rtnl_register(int protocol, int msgtype,
209 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
211 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
212 panic("Unable to register rtnetlink message handler, "
213 "protocol = %d, message type = %d\n",
217 EXPORT_SYMBOL_GPL(rtnl_register);
220 * rtnl_unregister - Unregister a rtnetlink message type
221 * @protocol: Protocol family or PF_UNSPEC
222 * @msgtype: rtnetlink message type
224 * Returns 0 on success or a negative error code.
226 int rtnl_unregister(int protocol, int msgtype)
230 BUG_ON(protocol < 0 || protocol >= NPROTO);
231 msgindex = rtm_msgindex(msgtype);
233 if (rtnl_msg_handlers[protocol] == NULL)
236 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
237 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
242 EXPORT_SYMBOL_GPL(rtnl_unregister);
245 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
246 * @protocol : Protocol family or PF_UNSPEC
248 * Identical to calling rtnl_unregster() for all registered message types
249 * of a certain protocol family.
251 void rtnl_unregister_all(int protocol)
253 BUG_ON(protocol < 0 || protocol >= NPROTO);
255 kfree(rtnl_msg_handlers[protocol]);
256 rtnl_msg_handlers[protocol] = NULL;
259 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
261 static LIST_HEAD(link_ops);
264 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
265 * @ops: struct rtnl_link_ops * to register
267 * The caller must hold the rtnl_mutex. This function should be used
268 * by drivers that create devices during module initialization. It
269 * must be called before registering the devices.
271 * Returns 0 on success or a negative error code.
273 int __rtnl_link_register(struct rtnl_link_ops *ops)
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. This function should be used
304 * by drivers that unregister devices during module unloading. It must
305 * be called after unregistering the devices.
307 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
309 list_del(&ops->list);
312 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
315 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
316 * @ops: struct rtnl_link_ops * to unregister
318 void rtnl_link_unregister(struct rtnl_link_ops *ops)
321 __rtnl_link_unregister(ops);
325 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
327 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
329 const struct rtnl_link_ops *ops;
331 list_for_each_entry(ops, &link_ops, list) {
332 if (!strcmp(ops->kind, kind))
338 static size_t rtnl_link_get_size(const struct net_device *dev)
340 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
346 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
347 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
350 /* IFLA_INFO_DATA + nested data */
351 size += nlmsg_total_size(sizeof(struct nlattr)) +
354 if (ops->get_xstats_size)
355 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
360 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
362 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
363 struct nlattr *linkinfo, *data;
366 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
367 if (linkinfo == NULL)
370 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
371 goto err_cancel_link;
372 if (ops->fill_xstats) {
373 err = ops->fill_xstats(skb, dev);
375 goto err_cancel_link;
377 if (ops->fill_info) {
378 data = nla_nest_start(skb, IFLA_INFO_DATA);
380 goto err_cancel_link;
381 err = ops->fill_info(skb, dev);
383 goto err_cancel_data;
384 nla_nest_end(skb, data);
387 nla_nest_end(skb, linkinfo);
391 nla_nest_cancel(skb, data);
393 nla_nest_cancel(skb, linkinfo);
398 static const int rtm_min[RTM_NR_FAMILIES] =
400 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
401 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
402 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
403 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
404 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
405 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
406 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
407 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
408 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
409 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
412 static const int rta_max[RTM_NR_FAMILIES] =
414 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
415 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
416 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
417 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
418 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
419 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
420 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
421 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
424 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
427 int size = RTA_LENGTH(attrlen);
429 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
430 rta->rta_type = attrtype;
432 memcpy(RTA_DATA(rta), data, attrlen);
433 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
436 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
438 size_t ret = RTA_PAYLOAD(rta);
439 char *src = RTA_DATA(rta);
441 if (ret > 0 && src[ret - 1] == '\0')
444 size_t len = (ret >= size) ? size - 1 : ret;
445 memset(dest, 0, size);
446 memcpy(dest, src, len);
451 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
455 NETLINK_CB(skb).dst_group = group;
457 atomic_inc(&skb->users);
458 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
460 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
464 int rtnl_unicast(struct sk_buff *skb, u32 pid)
466 return nlmsg_unicast(rtnl, skb, pid);
469 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
470 struct nlmsghdr *nlh, gfp_t flags)
475 report = nlmsg_report(nlh);
477 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
480 void rtnl_set_sk_err(u32 group, int error)
482 netlink_set_err(rtnl, 0, group, error);
485 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
490 mx = nla_nest_start(skb, RTA_METRICS);
494 for (i = 0; i < RTAX_MAX; i++) {
497 NLA_PUT_U32(skb, i+1, metrics[i]);
502 nla_nest_cancel(skb, mx);
506 return nla_nest_end(skb, mx);
509 return nla_nest_cancel(skb, mx);
512 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
513 u32 ts, u32 tsage, long expires, u32 error)
515 struct rta_cacheinfo ci = {
516 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
517 .rta_used = dst->__use,
518 .rta_clntref = atomic_read(&(dst->__refcnt)),
526 ci.rta_expires = jiffies_to_clock_t(expires);
528 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
531 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
533 static void set_operstate(struct net_device *dev, unsigned char transition)
535 unsigned char operstate = dev->operstate;
539 if ((operstate == IF_OPER_DORMANT ||
540 operstate == IF_OPER_UNKNOWN) &&
542 operstate = IF_OPER_UP;
545 case IF_OPER_DORMANT:
546 if (operstate == IF_OPER_UP ||
547 operstate == IF_OPER_UNKNOWN)
548 operstate = IF_OPER_DORMANT;
552 if (dev->operstate != operstate) {
553 write_lock_bh(&dev_base_lock);
554 dev->operstate = operstate;
555 write_unlock_bh(&dev_base_lock);
556 netdev_state_change(dev);
560 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
561 struct net_device_stats *b)
563 a->rx_packets = b->rx_packets;
564 a->tx_packets = b->tx_packets;
565 a->rx_bytes = b->rx_bytes;
566 a->tx_bytes = b->tx_bytes;
567 a->rx_errors = b->rx_errors;
568 a->tx_errors = b->tx_errors;
569 a->rx_dropped = b->rx_dropped;
570 a->tx_dropped = b->tx_dropped;
572 a->multicast = b->multicast;
573 a->collisions = b->collisions;
575 a->rx_length_errors = b->rx_length_errors;
576 a->rx_over_errors = b->rx_over_errors;
577 a->rx_crc_errors = b->rx_crc_errors;
578 a->rx_frame_errors = b->rx_frame_errors;
579 a->rx_fifo_errors = b->rx_fifo_errors;
580 a->rx_missed_errors = b->rx_missed_errors;
582 a->tx_aborted_errors = b->tx_aborted_errors;
583 a->tx_carrier_errors = b->tx_carrier_errors;
584 a->tx_fifo_errors = b->tx_fifo_errors;
585 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
586 a->tx_window_errors = b->tx_window_errors;
588 a->rx_compressed = b->rx_compressed;
589 a->tx_compressed = b->tx_compressed;
592 static inline size_t if_nlmsg_size(const struct net_device *dev)
594 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
595 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
596 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
597 + nla_total_size(sizeof(struct rtnl_link_ifmap))
598 + nla_total_size(sizeof(struct rtnl_link_stats))
599 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
600 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
601 + nla_total_size(4) /* IFLA_TXQLEN */
602 + nla_total_size(4) /* IFLA_WEIGHT */
603 + nla_total_size(4) /* IFLA_MTU */
604 + nla_total_size(4) /* IFLA_LINK */
605 + nla_total_size(4) /* IFLA_MASTER */
606 + nla_total_size(1) /* IFLA_OPERSTATE */
607 + nla_total_size(1) /* IFLA_LINKMODE */
608 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
611 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
612 int type, u32 pid, u32 seq, u32 change,
615 struct ifinfomsg *ifm;
616 struct nlmsghdr *nlh;
618 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
622 ifm = nlmsg_data(nlh);
623 ifm->ifi_family = AF_UNSPEC;
625 ifm->ifi_type = dev->type;
626 ifm->ifi_index = dev->ifindex;
627 ifm->ifi_flags = dev_get_flags(dev);
628 ifm->ifi_change = change;
630 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
631 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
632 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
633 NLA_PUT_U8(skb, IFLA_OPERSTATE,
634 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
635 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
636 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
638 if (dev->ifindex != dev->iflink)
639 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
642 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
644 if (dev->qdisc_sleeping)
645 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
648 struct rtnl_link_ifmap map = {
649 .mem_start = dev->mem_start,
650 .mem_end = dev->mem_end,
651 .base_addr = dev->base_addr,
654 .port = dev->if_port,
656 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
660 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
661 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
664 if (dev->get_stats) {
665 struct net_device_stats *stats = dev->get_stats(dev);
669 attr = nla_reserve(skb, IFLA_STATS,
670 sizeof(struct rtnl_link_stats));
672 goto nla_put_failure;
674 copy_rtnl_link_stats(nla_data(attr), stats);
678 if (dev->rtnl_link_ops) {
679 if (rtnl_link_fill(skb, dev) < 0)
680 goto nla_put_failure;
683 return nlmsg_end(skb, nlh);
686 nlmsg_cancel(skb, nlh);
690 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
693 int s_idx = cb->args[0];
694 struct net_device *dev;
697 for_each_netdev(dev) {
700 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
701 NETLINK_CB(cb->skb).pid,
702 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
712 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
713 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
714 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
715 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
716 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
717 [IFLA_MTU] = { .type = NLA_U32 },
718 [IFLA_TXQLEN] = { .type = NLA_U32 },
719 [IFLA_WEIGHT] = { .type = NLA_U32 },
720 [IFLA_OPERSTATE] = { .type = NLA_U8 },
721 [IFLA_LINKMODE] = { .type = NLA_U8 },
724 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
725 [IFLA_INFO_KIND] = { .type = NLA_STRING },
726 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
729 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
730 struct nlattr **tb, char *ifname, int modified)
732 int send_addr_notify = 0;
736 struct rtnl_link_ifmap *u_map;
739 if (!dev->set_config) {
744 if (!netif_device_present(dev)) {
749 u_map = nla_data(tb[IFLA_MAP]);
750 k_map.mem_start = (unsigned long) u_map->mem_start;
751 k_map.mem_end = (unsigned long) u_map->mem_end;
752 k_map.base_addr = (unsigned short) u_map->base_addr;
753 k_map.irq = (unsigned char) u_map->irq;
754 k_map.dma = (unsigned char) u_map->dma;
755 k_map.port = (unsigned char) u_map->port;
757 err = dev->set_config(dev, &k_map);
764 if (tb[IFLA_ADDRESS]) {
768 if (!dev->set_mac_address) {
773 if (!netif_device_present(dev)) {
778 len = sizeof(sa_family_t) + dev->addr_len;
779 sa = kmalloc(len, GFP_KERNEL);
784 sa->sa_family = dev->type;
785 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
787 err = dev->set_mac_address(dev, sa);
791 send_addr_notify = 1;
796 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
803 * Interface selected by interface index but interface
804 * name provided implies that a name change has been
807 if (ifm->ifi_index > 0 && ifname[0]) {
808 err = dev_change_name(dev, ifname);
814 if (tb[IFLA_BROADCAST]) {
815 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
816 send_addr_notify = 1;
819 if (ifm->ifi_flags || ifm->ifi_change) {
820 unsigned int flags = ifm->ifi_flags;
822 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
824 flags = (flags & ifm->ifi_change) |
825 (dev->flags & ~ifm->ifi_change);
826 dev_change_flags(dev, flags);
830 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
833 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
835 if (tb[IFLA_OPERSTATE])
836 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
838 if (tb[IFLA_LINKMODE]) {
839 write_lock_bh(&dev_base_lock);
840 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
841 write_unlock_bh(&dev_base_lock);
847 if (err < 0 && modified && net_ratelimit())
848 printk(KERN_WARNING "A link change request failed with "
849 "some changes comitted already. Interface %s may "
850 "have been left with an inconsistent configuration, "
851 "please check.\n", dev->name);
853 if (send_addr_notify)
854 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
858 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
860 struct ifinfomsg *ifm;
861 struct net_device *dev;
863 struct nlattr *tb[IFLA_MAX+1];
864 char ifname[IFNAMSIZ];
866 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
871 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
876 ifm = nlmsg_data(nlh);
877 if (ifm->ifi_index > 0)
878 dev = dev_get_by_index(ifm->ifi_index);
879 else if (tb[IFLA_IFNAME])
880 dev = dev_get_by_name(ifname);
889 if (tb[IFLA_ADDRESS] &&
890 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
893 if (tb[IFLA_BROADCAST] &&
894 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
897 err = do_setlink(dev, ifm, tb, ifname, 0);
904 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
906 const struct rtnl_link_ops *ops;
907 struct net_device *dev;
908 struct ifinfomsg *ifm;
909 char ifname[IFNAMSIZ];
910 struct nlattr *tb[IFLA_MAX+1];
913 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
918 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
920 ifm = nlmsg_data(nlh);
921 if (ifm->ifi_index > 0)
922 dev = __dev_get_by_index(ifm->ifi_index);
923 else if (tb[IFLA_IFNAME])
924 dev = __dev_get_by_name(ifname);
931 ops = dev->rtnl_link_ops;
939 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
941 const struct rtnl_link_ops *ops;
942 struct net_device *dev;
943 struct ifinfomsg *ifm;
944 char kind[MODULE_NAME_LEN];
945 char ifname[IFNAMSIZ];
946 struct nlattr *tb[IFLA_MAX+1];
947 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
951 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
956 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
960 ifm = nlmsg_data(nlh);
961 if (ifm->ifi_index > 0)
962 dev = __dev_get_by_index(ifm->ifi_index);
964 dev = __dev_get_by_name(ifname);
968 if (tb[IFLA_LINKINFO]) {
969 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
970 tb[IFLA_LINKINFO], ifla_info_policy);
974 memset(linkinfo, 0, sizeof(linkinfo));
976 if (linkinfo[IFLA_INFO_KIND]) {
977 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
978 ops = rtnl_link_ops_get(kind);
985 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
988 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
989 err = nla_parse_nested(attr, ops->maxtype,
990 linkinfo[IFLA_INFO_DATA],
997 err = ops->validate(tb, data);
1006 if (nlh->nlmsg_flags & NLM_F_EXCL)
1008 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1011 if (linkinfo[IFLA_INFO_DATA]) {
1012 if (!ops || ops != dev->rtnl_link_ops ||
1016 err = ops->changelink(dev, tb, data);
1022 return do_setlink(dev, ifm, tb, ifname, modified);
1025 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1028 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1030 if (tb[IFLA_ADDRESS] || tb[IFLA_BROADCAST] || tb[IFLA_MAP] ||
1031 tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1038 request_module("rtnl-link-%s", kind);
1040 ops = rtnl_link_ops_get(kind);
1049 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1050 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
1054 if (strchr(dev->name, '%')) {
1055 err = dev_alloc_name(dev, dev->name);
1059 dev->rtnl_link_ops = ops;
1062 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1063 if (tb[IFLA_TXQLEN])
1064 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1065 if (tb[IFLA_WEIGHT])
1066 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
1067 if (tb[IFLA_OPERSTATE])
1068 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1069 if (tb[IFLA_LINKMODE])
1070 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1072 err = ops->newlink(dev, tb, data);
1080 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1082 struct ifinfomsg *ifm;
1083 struct nlattr *tb[IFLA_MAX+1];
1084 struct net_device *dev = NULL;
1085 struct sk_buff *nskb;
1088 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1092 ifm = nlmsg_data(nlh);
1093 if (ifm->ifi_index > 0) {
1094 dev = dev_get_by_index(ifm->ifi_index);
1100 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1106 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1107 nlh->nlmsg_seq, 0, 0);
1109 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1110 WARN_ON(err == -EMSGSIZE);
1114 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
1121 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1124 int s_idx = cb->family;
1128 for (idx=1; idx<NPROTO; idx++) {
1129 int type = cb->nlh->nlmsg_type-RTM_BASE;
1130 if (idx < s_idx || idx == PF_PACKET)
1132 if (rtnl_msg_handlers[idx] == NULL ||
1133 rtnl_msg_handlers[idx][type].dumpit == NULL)
1136 memset(&cb->args[0], 0, sizeof(cb->args));
1137 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1145 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1147 struct sk_buff *skb;
1150 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1154 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1156 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1157 WARN_ON(err == -EMSGSIZE);
1161 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1164 rtnl_set_sk_err(RTNLGRP_LINK, err);
1167 /* Protected by RTNL sempahore. */
1168 static struct rtattr **rta_buf;
1169 static int rtattr_max;
1171 /* Process one rtnetlink message. */
1173 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1175 rtnl_doit_func doit;
1182 type = nlh->nlmsg_type;
1188 /* All the messages must have at least 1 byte length */
1189 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1192 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1193 if (family >= NPROTO)
1194 return -EAFNOSUPPORT;
1199 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1202 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1203 rtnl_dumpit_func dumpit;
1205 dumpit = rtnl_get_dumpit(family, type);
1210 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1215 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1217 min_len = rtm_min[sz_idx];
1218 if (nlh->nlmsg_len < min_len)
1221 if (nlh->nlmsg_len > min_len) {
1222 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1223 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1225 while (RTA_OK(attr, attrlen)) {
1226 unsigned flavor = attr->rta_type;
1228 if (flavor > rta_max[sz_idx])
1230 rta_buf[flavor-1] = attr;
1232 attr = RTA_NEXT(attr, attrlen);
1236 doit = rtnl_get_doit(family, type);
1240 return doit(skb, nlh, (void *)&rta_buf[0]);
1243 static void rtnetlink_rcv(struct sock *sk, int len)
1245 unsigned int qlen = 0;
1248 mutex_lock(&rtnl_mutex);
1249 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
1250 mutex_unlock(&rtnl_mutex);
1256 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1258 struct net_device *dev = ptr;
1260 case NETDEV_UNREGISTER:
1261 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1263 case NETDEV_REGISTER:
1264 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1268 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1271 case NETDEV_GOING_DOWN:
1274 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1280 static struct notifier_block rtnetlink_dev_notifier = {
1281 .notifier_call = rtnetlink_event,
1284 void __init rtnetlink_init(void)
1289 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1290 if (rta_max[i] > rtattr_max)
1291 rtattr_max = rta_max[i];
1292 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1294 panic("rtnetlink_init: cannot allocate rta_buf\n");
1296 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
1297 &rtnl_mutex, THIS_MODULE);
1299 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1300 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1301 register_netdevice_notifier(&rtnetlink_dev_notifier);
1303 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1304 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1305 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1306 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1308 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1309 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1312 EXPORT_SYMBOL(__rta_fill);
1313 EXPORT_SYMBOL(rtattr_strlcpy);
1314 EXPORT_SYMBOL(rtattr_parse);
1315 EXPORT_SYMBOL(rtattr_parse_nested_compat);
1316 EXPORT_SYMBOL(rtnetlink_put_metrics);
1317 EXPORT_SYMBOL(rtnl_lock);
1318 EXPORT_SYMBOL(rtnl_trylock);
1319 EXPORT_SYMBOL(rtnl_unlock);
1320 EXPORT_SYMBOL(rtnl_unicast);
1321 EXPORT_SYMBOL(rtnl_notify);
1322 EXPORT_SYMBOL(rtnl_set_sk_err);