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 struct rtnl_link *rtnl_msg_handlers[NPROTO];
102 static inline int rtm_msgindex(int msgtype)
104 int msgindex = msgtype - RTM_BASE;
107 * msgindex < 0 implies someone tried to register a netlink
108 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
109 * the message type has not been added to linux/rtnetlink.h
111 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
116 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
118 struct rtnl_link *tab;
120 tab = rtnl_msg_handlers[protocol];
121 if (tab == NULL || tab[msgindex].doit == NULL)
122 tab = rtnl_msg_handlers[PF_UNSPEC];
124 return tab ? tab[msgindex].doit : NULL;
127 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
129 struct rtnl_link *tab;
131 tab = rtnl_msg_handlers[protocol];
132 if (tab == NULL || tab[msgindex].dumpit == NULL)
133 tab = rtnl_msg_handlers[PF_UNSPEC];
135 return tab ? tab[msgindex].dumpit : NULL;
139 * __rtnl_register - Register a rtnetlink message type
140 * @protocol: Protocol family or PF_UNSPEC
141 * @msgtype: rtnetlink message type
142 * @doit: Function pointer called for each request message
143 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
145 * Registers the specified function pointers (at least one of them has
146 * to be non-NULL) to be called whenever a request message for the
147 * specified protocol family and message type is received.
149 * The special protocol family PF_UNSPEC may be used to define fallback
150 * function pointers for the case when no entry for the specific protocol
153 * Returns 0 on success or a negative error code.
155 int __rtnl_register(int protocol, int msgtype,
156 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
158 struct rtnl_link *tab;
161 BUG_ON(protocol < 0 || protocol >= NPROTO);
162 msgindex = rtm_msgindex(msgtype);
164 tab = rtnl_msg_handlers[protocol];
166 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
170 rtnl_msg_handlers[protocol] = tab;
174 tab[msgindex].doit = doit;
177 tab[msgindex].dumpit = dumpit;
182 EXPORT_SYMBOL_GPL(__rtnl_register);
185 * rtnl_register - Register a rtnetlink message type
187 * Identical to __rtnl_register() but panics on failure. This is useful
188 * as failure of this function is very unlikely, it can only happen due
189 * to lack of memory when allocating the chain to store all message
190 * handlers for a protocol. Meant for use in init functions where lack
191 * of memory implies no sense in continueing.
193 void rtnl_register(int protocol, int msgtype,
194 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
196 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
197 panic("Unable to register rtnetlink message handler, "
198 "protocol = %d, message type = %d\n",
202 EXPORT_SYMBOL_GPL(rtnl_register);
205 * rtnl_unregister - Unregister a rtnetlink message type
206 * @protocol: Protocol family or PF_UNSPEC
207 * @msgtype: rtnetlink message type
209 * Returns 0 on success or a negative error code.
211 int rtnl_unregister(int protocol, int msgtype)
215 BUG_ON(protocol < 0 || protocol >= NPROTO);
216 msgindex = rtm_msgindex(msgtype);
218 if (rtnl_msg_handlers[protocol] == NULL)
221 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
222 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
227 EXPORT_SYMBOL_GPL(rtnl_unregister);
230 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
231 * @protocol : Protocol family or PF_UNSPEC
233 * Identical to calling rtnl_unregster() for all registered message types
234 * of a certain protocol family.
236 void rtnl_unregister_all(int protocol)
238 BUG_ON(protocol < 0 || protocol >= NPROTO);
240 kfree(rtnl_msg_handlers[protocol]);
241 rtnl_msg_handlers[protocol] = NULL;
244 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
246 static const int rtm_min[RTM_NR_FAMILIES] =
248 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
249 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
250 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
251 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
252 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
253 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
254 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
255 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
256 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
257 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
260 static const int rta_max[RTM_NR_FAMILIES] =
262 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
263 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
264 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
265 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
266 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
267 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
268 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
269 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
272 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
275 int size = RTA_LENGTH(attrlen);
277 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
278 rta->rta_type = attrtype;
280 memcpy(RTA_DATA(rta), data, attrlen);
281 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
284 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
286 size_t ret = RTA_PAYLOAD(rta);
287 char *src = RTA_DATA(rta);
289 if (ret > 0 && src[ret - 1] == '\0')
292 size_t len = (ret >= size) ? size - 1 : ret;
293 memset(dest, 0, size);
294 memcpy(dest, src, len);
299 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
303 NETLINK_CB(skb).dst_group = group;
305 atomic_inc(&skb->users);
306 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
308 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
312 int rtnl_unicast(struct sk_buff *skb, u32 pid)
314 return nlmsg_unicast(rtnl, skb, pid);
317 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
318 struct nlmsghdr *nlh, gfp_t flags)
323 report = nlmsg_report(nlh);
325 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
328 void rtnl_set_sk_err(u32 group, int error)
330 netlink_set_err(rtnl, 0, group, error);
333 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
338 mx = nla_nest_start(skb, RTA_METRICS);
342 for (i = 0; i < RTAX_MAX; i++) {
345 NLA_PUT_U32(skb, i+1, metrics[i]);
350 nla_nest_cancel(skb, mx);
354 return nla_nest_end(skb, mx);
357 return nla_nest_cancel(skb, mx);
360 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
361 u32 ts, u32 tsage, long expires, u32 error)
363 struct rta_cacheinfo ci = {
364 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
365 .rta_used = dst->__use,
366 .rta_clntref = atomic_read(&(dst->__refcnt)),
374 ci.rta_expires = jiffies_to_clock_t(expires);
376 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
379 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
381 static void set_operstate(struct net_device *dev, unsigned char transition)
383 unsigned char operstate = dev->operstate;
387 if ((operstate == IF_OPER_DORMANT ||
388 operstate == IF_OPER_UNKNOWN) &&
390 operstate = IF_OPER_UP;
393 case IF_OPER_DORMANT:
394 if (operstate == IF_OPER_UP ||
395 operstate == IF_OPER_UNKNOWN)
396 operstate = IF_OPER_DORMANT;
400 if (dev->operstate != operstate) {
401 write_lock_bh(&dev_base_lock);
402 dev->operstate = operstate;
403 write_unlock_bh(&dev_base_lock);
404 netdev_state_change(dev);
408 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
409 struct net_device_stats *b)
411 a->rx_packets = b->rx_packets;
412 a->tx_packets = b->tx_packets;
413 a->rx_bytes = b->rx_bytes;
414 a->tx_bytes = b->tx_bytes;
415 a->rx_errors = b->rx_errors;
416 a->tx_errors = b->tx_errors;
417 a->rx_dropped = b->rx_dropped;
418 a->tx_dropped = b->tx_dropped;
420 a->multicast = b->multicast;
421 a->collisions = b->collisions;
423 a->rx_length_errors = b->rx_length_errors;
424 a->rx_over_errors = b->rx_over_errors;
425 a->rx_crc_errors = b->rx_crc_errors;
426 a->rx_frame_errors = b->rx_frame_errors;
427 a->rx_fifo_errors = b->rx_fifo_errors;
428 a->rx_missed_errors = b->rx_missed_errors;
430 a->tx_aborted_errors = b->tx_aborted_errors;
431 a->tx_carrier_errors = b->tx_carrier_errors;
432 a->tx_fifo_errors = b->tx_fifo_errors;
433 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
434 a->tx_window_errors = b->tx_window_errors;
436 a->rx_compressed = b->rx_compressed;
437 a->tx_compressed = b->tx_compressed;
440 static inline size_t if_nlmsg_size(int iwbuflen)
442 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
443 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
444 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
445 + nla_total_size(sizeof(struct rtnl_link_ifmap))
446 + nla_total_size(sizeof(struct rtnl_link_stats))
447 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
448 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
449 + nla_total_size(4) /* IFLA_TXQLEN */
450 + nla_total_size(4) /* IFLA_WEIGHT */
451 + nla_total_size(4) /* IFLA_MTU */
452 + nla_total_size(4) /* IFLA_LINK */
453 + nla_total_size(4) /* IFLA_MASTER */
454 + nla_total_size(1) /* IFLA_OPERSTATE */
455 + nla_total_size(1) /* IFLA_LINKMODE */
456 + nla_total_size(iwbuflen);
459 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
460 void *iwbuf, int iwbuflen, int type, u32 pid,
461 u32 seq, u32 change, unsigned int flags)
463 struct ifinfomsg *ifm;
464 struct nlmsghdr *nlh;
466 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
470 ifm = nlmsg_data(nlh);
471 ifm->ifi_family = AF_UNSPEC;
473 ifm->ifi_type = dev->type;
474 ifm->ifi_index = dev->ifindex;
475 ifm->ifi_flags = dev_get_flags(dev);
476 ifm->ifi_change = change;
478 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
479 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
480 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
481 NLA_PUT_U8(skb, IFLA_OPERSTATE,
482 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
483 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
484 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
486 if (dev->ifindex != dev->iflink)
487 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
490 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
492 if (dev->qdisc_sleeping)
493 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
496 struct rtnl_link_ifmap map = {
497 .mem_start = dev->mem_start,
498 .mem_end = dev->mem_end,
499 .base_addr = dev->base_addr,
502 .port = dev->if_port,
504 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
508 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
509 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
512 if (dev->get_stats) {
513 struct net_device_stats *stats = dev->get_stats(dev);
517 attr = nla_reserve(skb, IFLA_STATS,
518 sizeof(struct rtnl_link_stats));
520 goto nla_put_failure;
522 copy_rtnl_link_stats(nla_data(attr), stats);
527 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
529 return nlmsg_end(skb, nlh);
532 nlmsg_cancel(skb, nlh);
536 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
539 int s_idx = cb->args[0];
540 struct net_device *dev;
542 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
545 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
546 NETLINK_CB(cb->skb).pid,
547 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
555 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
556 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
557 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
558 [IFLA_MTU] = { .type = NLA_U32 },
559 [IFLA_TXQLEN] = { .type = NLA_U32 },
560 [IFLA_WEIGHT] = { .type = NLA_U32 },
561 [IFLA_OPERSTATE] = { .type = NLA_U8 },
562 [IFLA_LINKMODE] = { .type = NLA_U8 },
565 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
567 struct ifinfomsg *ifm;
568 struct net_device *dev;
569 int err, send_addr_notify = 0, modified = 0;
570 struct nlattr *tb[IFLA_MAX+1];
571 char ifname[IFNAMSIZ];
573 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
578 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
583 ifm = nlmsg_data(nlh);
584 if (ifm->ifi_index >= 0)
585 dev = dev_get_by_index(ifm->ifi_index);
586 else if (tb[IFLA_IFNAME])
587 dev = dev_get_by_name(ifname);
596 if (tb[IFLA_ADDRESS] &&
597 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
600 if (tb[IFLA_BROADCAST] &&
601 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
605 struct rtnl_link_ifmap *u_map;
608 if (!dev->set_config) {
613 if (!netif_device_present(dev)) {
618 u_map = nla_data(tb[IFLA_MAP]);
619 k_map.mem_start = (unsigned long) u_map->mem_start;
620 k_map.mem_end = (unsigned long) u_map->mem_end;
621 k_map.base_addr = (unsigned short) u_map->base_addr;
622 k_map.irq = (unsigned char) u_map->irq;
623 k_map.dma = (unsigned char) u_map->dma;
624 k_map.port = (unsigned char) u_map->port;
626 err = dev->set_config(dev, &k_map);
633 if (tb[IFLA_ADDRESS]) {
637 if (!dev->set_mac_address) {
642 if (!netif_device_present(dev)) {
647 len = sizeof(sa_family_t) + dev->addr_len;
648 sa = kmalloc(len, GFP_KERNEL);
653 sa->sa_family = dev->type;
654 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
656 err = dev->set_mac_address(dev, sa);
660 send_addr_notify = 1;
665 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
672 * Interface selected by interface index but interface
673 * name provided implies that a name change has been
676 if (ifm->ifi_index >= 0 && ifname[0]) {
677 err = dev_change_name(dev, ifname);
683 if (tb[IFLA_BROADCAST]) {
684 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
685 send_addr_notify = 1;
690 dev_change_flags(dev, ifm->ifi_flags);
693 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
696 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
698 if (tb[IFLA_OPERSTATE])
699 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
701 if (tb[IFLA_LINKMODE]) {
702 write_lock_bh(&dev_base_lock);
703 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
704 write_unlock_bh(&dev_base_lock);
710 if (err < 0 && modified && net_ratelimit())
711 printk(KERN_WARNING "A link change request failed with "
712 "some changes comitted already. Interface %s may "
713 "have been left with an inconsistent configuration, "
714 "please check.\n", dev->name);
716 if (send_addr_notify)
717 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
724 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
726 struct ifinfomsg *ifm;
727 struct nlattr *tb[IFLA_MAX+1];
728 struct net_device *dev = NULL;
729 struct sk_buff *nskb;
730 char *iw_buf = NULL, *iw = NULL;
734 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
738 ifm = nlmsg_data(nlh);
739 if (ifm->ifi_index >= 0) {
740 dev = dev_get_by_index(ifm->ifi_index);
746 nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
752 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
753 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
755 /* -EMSGSIZE implies BUG in if_nlmsg_size */
756 WARN_ON(err == -EMSGSIZE);
760 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
768 int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
771 int s_idx = cb->family;
775 for (idx=1; idx<NPROTO; idx++) {
776 int type = cb->nlh->nlmsg_type-RTM_BASE;
777 if (idx < s_idx || idx == PF_PACKET)
779 if (rtnl_msg_handlers[idx] == NULL ||
780 rtnl_msg_handlers[idx][type].dumpit == NULL)
783 memset(&cb->args[0], 0, sizeof(cb->args));
784 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
792 EXPORT_SYMBOL_GPL(rtnl_dump_all);
794 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
799 skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
803 err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
805 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
806 WARN_ON(err == -EMSGSIZE);
810 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
813 rtnl_set_sk_err(RTNLGRP_LINK, err);
816 /* Protected by RTNL sempahore. */
817 static struct rtattr **rta_buf;
818 static int rtattr_max;
820 /* Process one rtnetlink message. */
822 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
831 type = nlh->nlmsg_type;
837 /* All the messages must have at least 1 byte length */
838 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
841 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
842 if (family >= NPROTO)
843 return -EAFNOSUPPORT;
848 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
851 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
852 rtnl_dumpit_func dumpit;
854 dumpit = rtnl_get_dumpit(family, type);
859 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
864 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
866 min_len = rtm_min[sz_idx];
867 if (nlh->nlmsg_len < min_len)
870 if (nlh->nlmsg_len > min_len) {
871 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
872 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
874 while (RTA_OK(attr, attrlen)) {
875 unsigned flavor = attr->rta_type;
877 if (flavor > rta_max[sz_idx])
879 rta_buf[flavor-1] = attr;
881 attr = RTA_NEXT(attr, attrlen);
885 doit = rtnl_get_doit(family, type);
889 return doit(skb, nlh, (void *)&rta_buf[0]);
892 static void rtnetlink_rcv(struct sock *sk, int len)
894 unsigned int qlen = 0;
897 mutex_lock(&rtnl_mutex);
898 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
899 mutex_unlock(&rtnl_mutex);
905 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
907 struct net_device *dev = ptr;
909 case NETDEV_UNREGISTER:
910 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
912 case NETDEV_REGISTER:
913 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
917 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
920 case NETDEV_GOING_DOWN:
923 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
929 static struct notifier_block rtnetlink_dev_notifier = {
930 .notifier_call = rtnetlink_event,
933 void __init rtnetlink_init(void)
938 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
939 if (rta_max[i] > rtattr_max)
940 rtattr_max = rta_max[i];
941 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
943 panic("rtnetlink_init: cannot allocate rta_buf\n");
945 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
946 &rtnl_mutex, THIS_MODULE);
948 panic("rtnetlink_init: cannot initialize rtnetlink\n");
949 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
950 register_netdevice_notifier(&rtnetlink_dev_notifier);
952 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
953 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
955 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
956 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
959 EXPORT_SYMBOL(__rta_fill);
960 EXPORT_SYMBOL(rtattr_strlcpy);
961 EXPORT_SYMBOL(rtattr_parse);
962 EXPORT_SYMBOL(rtnetlink_put_metrics);
963 EXPORT_SYMBOL(rtnl_lock);
964 EXPORT_SYMBOL(rtnl_trylock);
965 EXPORT_SYMBOL(rtnl_unlock);
966 EXPORT_SYMBOL(rtnl_unicast);
967 EXPORT_SYMBOL(rtnl_notify);
968 EXPORT_SYMBOL(rtnl_set_sk_err);