Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
896 lines
22 KiB
C
896 lines
22 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Routing netlink socket interface: protocol independent part.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Fixes:
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* Vitaly E. Lavrov RTA_OK arithmetics was wrong.
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/capability.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/security.h>
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#include <linux/mutex.h>
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#include <linux/if_addr.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/string.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/arp.h>
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#include <net/route.h>
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#include <net/udp.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <net/fib_rules.h>
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#include <net/netlink.h>
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#ifdef CONFIG_NET_WIRELESS_RTNETLINK
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#include <linux/wireless.h>
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#include <net/iw_handler.h>
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#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
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static DEFINE_MUTEX(rtnl_mutex);
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static struct sock *rtnl;
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void rtnl_lock(void)
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{
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mutex_lock(&rtnl_mutex);
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}
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void __rtnl_unlock(void)
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{
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mutex_unlock(&rtnl_mutex);
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}
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void rtnl_unlock(void)
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{
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mutex_unlock(&rtnl_mutex);
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if (rtnl && rtnl->sk_receive_queue.qlen)
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rtnl->sk_data_ready(rtnl, 0);
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netdev_run_todo();
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}
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int rtnl_trylock(void)
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{
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return mutex_trylock(&rtnl_mutex);
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}
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int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
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{
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memset(tb, 0, sizeof(struct rtattr*)*maxattr);
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while (RTA_OK(rta, len)) {
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unsigned flavor = rta->rta_type;
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if (flavor && flavor <= maxattr)
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tb[flavor-1] = rta;
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rta = RTA_NEXT(rta, len);
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}
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return 0;
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}
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struct rtnetlink_link * rtnetlink_links[NPROTO];
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static const int rtm_min[RTM_NR_FAMILIES] =
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{
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[RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
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[RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
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[RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
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[RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
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[RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
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[RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
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[RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
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[RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
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[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
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[RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
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};
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static const int rta_max[RTM_NR_FAMILIES] =
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{
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[RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
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[RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
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[RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
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[RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
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[RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
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[RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
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[RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
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[RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
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};
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void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
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{
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struct rtattr *rta;
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int size = RTA_LENGTH(attrlen);
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rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
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rta->rta_type = attrtype;
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rta->rta_len = size;
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memcpy(RTA_DATA(rta), data, attrlen);
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memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
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}
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size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
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{
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size_t ret = RTA_PAYLOAD(rta);
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char *src = RTA_DATA(rta);
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if (ret > 0 && src[ret - 1] == '\0')
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ret--;
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if (size > 0) {
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size_t len = (ret >= size) ? size - 1 : ret;
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memset(dest, 0, size);
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memcpy(dest, src, len);
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}
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return ret;
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}
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int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
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{
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int err = 0;
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NETLINK_CB(skb).dst_group = group;
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if (echo)
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atomic_inc(&skb->users);
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netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
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if (echo)
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err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
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return err;
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}
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int rtnl_unicast(struct sk_buff *skb, u32 pid)
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{
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return nlmsg_unicast(rtnl, skb, pid);
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}
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int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
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struct nlmsghdr *nlh, gfp_t flags)
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{
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int report = 0;
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if (nlh)
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report = nlmsg_report(nlh);
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return nlmsg_notify(rtnl, skb, pid, group, report, flags);
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}
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void rtnl_set_sk_err(u32 group, int error)
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{
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netlink_set_err(rtnl, 0, group, error);
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}
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int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
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{
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struct nlattr *mx;
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int i, valid = 0;
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mx = nla_nest_start(skb, RTA_METRICS);
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if (mx == NULL)
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return -ENOBUFS;
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for (i = 0; i < RTAX_MAX; i++) {
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if (metrics[i]) {
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valid++;
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NLA_PUT_U32(skb, i+1, metrics[i]);
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}
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}
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if (!valid) {
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nla_nest_cancel(skb, mx);
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return 0;
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}
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return nla_nest_end(skb, mx);
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nla_put_failure:
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return nla_nest_cancel(skb, mx);
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}
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int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
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u32 ts, u32 tsage, long expires, u32 error)
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{
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struct rta_cacheinfo ci = {
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.rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
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.rta_used = dst->__use,
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.rta_clntref = atomic_read(&(dst->__refcnt)),
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.rta_error = error,
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.rta_id = id,
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.rta_ts = ts,
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.rta_tsage = tsage,
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};
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if (expires)
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ci.rta_expires = jiffies_to_clock_t(expires);
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return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
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}
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EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
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static void set_operstate(struct net_device *dev, unsigned char transition)
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{
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unsigned char operstate = dev->operstate;
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switch(transition) {
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case IF_OPER_UP:
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if ((operstate == IF_OPER_DORMANT ||
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operstate == IF_OPER_UNKNOWN) &&
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!netif_dormant(dev))
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operstate = IF_OPER_UP;
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break;
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case IF_OPER_DORMANT:
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if (operstate == IF_OPER_UP ||
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operstate == IF_OPER_UNKNOWN)
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operstate = IF_OPER_DORMANT;
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break;
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};
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if (dev->operstate != operstate) {
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write_lock_bh(&dev_base_lock);
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dev->operstate = operstate;
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write_unlock_bh(&dev_base_lock);
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netdev_state_change(dev);
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}
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}
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static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
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struct net_device_stats *b)
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{
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a->rx_packets = b->rx_packets;
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a->tx_packets = b->tx_packets;
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a->rx_bytes = b->rx_bytes;
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a->tx_bytes = b->tx_bytes;
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a->rx_errors = b->rx_errors;
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a->tx_errors = b->tx_errors;
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a->rx_dropped = b->rx_dropped;
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a->tx_dropped = b->tx_dropped;
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a->multicast = b->multicast;
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a->collisions = b->collisions;
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a->rx_length_errors = b->rx_length_errors;
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a->rx_over_errors = b->rx_over_errors;
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a->rx_crc_errors = b->rx_crc_errors;
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a->rx_frame_errors = b->rx_frame_errors;
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a->rx_fifo_errors = b->rx_fifo_errors;
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a->rx_missed_errors = b->rx_missed_errors;
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a->tx_aborted_errors = b->tx_aborted_errors;
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a->tx_carrier_errors = b->tx_carrier_errors;
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a->tx_fifo_errors = b->tx_fifo_errors;
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a->tx_heartbeat_errors = b->tx_heartbeat_errors;
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a->tx_window_errors = b->tx_window_errors;
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a->rx_compressed = b->rx_compressed;
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a->tx_compressed = b->tx_compressed;
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};
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static inline size_t if_nlmsg_size(int iwbuflen)
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{
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return NLMSG_ALIGN(sizeof(struct ifinfomsg))
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+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
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+ nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
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+ nla_total_size(sizeof(struct rtnl_link_ifmap))
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+ nla_total_size(sizeof(struct rtnl_link_stats))
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+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
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+ nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
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+ nla_total_size(4) /* IFLA_TXQLEN */
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+ nla_total_size(4) /* IFLA_WEIGHT */
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+ nla_total_size(4) /* IFLA_MTU */
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+ nla_total_size(4) /* IFLA_LINK */
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+ nla_total_size(4) /* IFLA_MASTER */
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+ nla_total_size(1) /* IFLA_OPERSTATE */
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+ nla_total_size(1) /* IFLA_LINKMODE */
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+ nla_total_size(iwbuflen);
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}
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static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
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void *iwbuf, int iwbuflen, int type, u32 pid,
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u32 seq, u32 change, unsigned int flags)
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{
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struct ifinfomsg *ifm;
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struct nlmsghdr *nlh;
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nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
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if (nlh == NULL)
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return -EMSGSIZE;
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ifm = nlmsg_data(nlh);
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ifm->ifi_family = AF_UNSPEC;
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ifm->__ifi_pad = 0;
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ifm->ifi_type = dev->type;
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ifm->ifi_index = dev->ifindex;
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ifm->ifi_flags = dev_get_flags(dev);
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ifm->ifi_change = change;
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NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
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NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
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NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
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NLA_PUT_U8(skb, IFLA_OPERSTATE,
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netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
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NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
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NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
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if (dev->ifindex != dev->iflink)
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NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
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if (dev->master)
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NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
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if (dev->qdisc_sleeping)
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NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
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if (1) {
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struct rtnl_link_ifmap map = {
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.mem_start = dev->mem_start,
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.mem_end = dev->mem_end,
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.base_addr = dev->base_addr,
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.irq = dev->irq,
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.dma = dev->dma,
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.port = dev->if_port,
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};
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NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
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}
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if (dev->addr_len) {
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NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
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NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
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}
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if (dev->get_stats) {
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struct net_device_stats *stats = dev->get_stats(dev);
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if (stats) {
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struct nlattr *attr;
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attr = nla_reserve(skb, IFLA_STATS,
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sizeof(struct rtnl_link_stats));
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if (attr == NULL)
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goto nla_put_failure;
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copy_rtnl_link_stats(nla_data(attr), stats);
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}
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}
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if (iwbuf)
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NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
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return nlmsg_end(skb, nlh);
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
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{
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int idx;
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int s_idx = cb->args[0];
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struct net_device *dev;
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read_lock(&dev_base_lock);
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for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
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if (idx < s_idx)
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continue;
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if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
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NETLINK_CB(cb->skb).pid,
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cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
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break;
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}
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read_unlock(&dev_base_lock);
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cb->args[0] = idx;
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return skb->len;
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}
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static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
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[IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
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[IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
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[IFLA_MTU] = { .type = NLA_U32 },
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[IFLA_TXQLEN] = { .type = NLA_U32 },
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[IFLA_WEIGHT] = { .type = NLA_U32 },
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[IFLA_OPERSTATE] = { .type = NLA_U8 },
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[IFLA_LINKMODE] = { .type = NLA_U8 },
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};
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static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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{
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struct ifinfomsg *ifm;
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struct net_device *dev;
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int err, send_addr_notify = 0, modified = 0;
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struct nlattr *tb[IFLA_MAX+1];
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char ifname[IFNAMSIZ];
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err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
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if (err < 0)
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goto errout;
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if (tb[IFLA_IFNAME])
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nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
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else
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ifname[0] = '\0';
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err = -EINVAL;
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ifm = nlmsg_data(nlh);
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if (ifm->ifi_index >= 0)
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dev = dev_get_by_index(ifm->ifi_index);
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else if (tb[IFLA_IFNAME])
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dev = dev_get_by_name(ifname);
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else
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goto errout;
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if (dev == NULL) {
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err = -ENODEV;
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goto errout;
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}
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if (tb[IFLA_ADDRESS] &&
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nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
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goto errout_dev;
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if (tb[IFLA_BROADCAST] &&
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nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
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goto errout_dev;
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if (tb[IFLA_MAP]) {
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struct rtnl_link_ifmap *u_map;
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struct ifmap k_map;
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if (!dev->set_config) {
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err = -EOPNOTSUPP;
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goto errout_dev;
|
|
}
|
|
|
|
if (!netif_device_present(dev)) {
|
|
err = -ENODEV;
|
|
goto errout_dev;
|
|
}
|
|
|
|
u_map = nla_data(tb[IFLA_MAP]);
|
|
k_map.mem_start = (unsigned long) u_map->mem_start;
|
|
k_map.mem_end = (unsigned long) u_map->mem_end;
|
|
k_map.base_addr = (unsigned short) u_map->base_addr;
|
|
k_map.irq = (unsigned char) u_map->irq;
|
|
k_map.dma = (unsigned char) u_map->dma;
|
|
k_map.port = (unsigned char) u_map->port;
|
|
|
|
err = dev->set_config(dev, &k_map);
|
|
if (err < 0)
|
|
goto errout_dev;
|
|
|
|
modified = 1;
|
|
}
|
|
|
|
if (tb[IFLA_ADDRESS]) {
|
|
struct sockaddr *sa;
|
|
int len;
|
|
|
|
if (!dev->set_mac_address) {
|
|
err = -EOPNOTSUPP;
|
|
goto errout_dev;
|
|
}
|
|
|
|
if (!netif_device_present(dev)) {
|
|
err = -ENODEV;
|
|
goto errout_dev;
|
|
}
|
|
|
|
len = sizeof(sa_family_t) + dev->addr_len;
|
|
sa = kmalloc(len, GFP_KERNEL);
|
|
if (!sa) {
|
|
err = -ENOMEM;
|
|
goto errout_dev;
|
|
}
|
|
sa->sa_family = dev->type;
|
|
memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
|
|
dev->addr_len);
|
|
err = dev->set_mac_address(dev, sa);
|
|
kfree(sa);
|
|
if (err)
|
|
goto errout_dev;
|
|
send_addr_notify = 1;
|
|
modified = 1;
|
|
}
|
|
|
|
if (tb[IFLA_MTU]) {
|
|
err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
|
|
if (err < 0)
|
|
goto errout_dev;
|
|
modified = 1;
|
|
}
|
|
|
|
/*
|
|
* Interface selected by interface index but interface
|
|
* name provided implies that a name change has been
|
|
* requested.
|
|
*/
|
|
if (ifm->ifi_index >= 0 && ifname[0]) {
|
|
err = dev_change_name(dev, ifname);
|
|
if (err < 0)
|
|
goto errout_dev;
|
|
modified = 1;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
|
|
if (tb[IFLA_WIRELESS]) {
|
|
/* Call Wireless Extensions.
|
|
* Various stuff checked in there... */
|
|
err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
|
|
nla_len(tb[IFLA_WIRELESS]));
|
|
if (err < 0)
|
|
goto errout_dev;
|
|
}
|
|
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
|
|
|
|
if (tb[IFLA_BROADCAST]) {
|
|
nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
|
|
send_addr_notify = 1;
|
|
}
|
|
|
|
|
|
if (ifm->ifi_flags)
|
|
dev_change_flags(dev, ifm->ifi_flags);
|
|
|
|
if (tb[IFLA_TXQLEN])
|
|
dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
|
|
|
|
if (tb[IFLA_WEIGHT])
|
|
dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
|
|
|
|
if (tb[IFLA_OPERSTATE])
|
|
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
|
|
|
|
if (tb[IFLA_LINKMODE]) {
|
|
write_lock_bh(&dev_base_lock);
|
|
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
|
|
write_unlock_bh(&dev_base_lock);
|
|
}
|
|
|
|
err = 0;
|
|
|
|
errout_dev:
|
|
if (err < 0 && modified && net_ratelimit())
|
|
printk(KERN_WARNING "A link change request failed with "
|
|
"some changes comitted already. Interface %s may "
|
|
"have been left with an inconsistent configuration, "
|
|
"please check.\n", dev->name);
|
|
|
|
if (send_addr_notify)
|
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
|
|
|
|
dev_put(dev);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct ifinfomsg *ifm;
|
|
struct nlattr *tb[IFLA_MAX+1];
|
|
struct net_device *dev = NULL;
|
|
struct sk_buff *nskb;
|
|
char *iw_buf = NULL, *iw = NULL;
|
|
int iw_buf_len = 0;
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->ifi_index >= 0) {
|
|
dev = dev_get_by_index(ifm->ifi_index);
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
} else
|
|
return -EINVAL;
|
|
|
|
|
|
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
|
|
if (tb[IFLA_WIRELESS]) {
|
|
/* Call Wireless Extensions. We need to know the size before
|
|
* we can alloc. Various stuff checked in there... */
|
|
err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
|
|
nla_len(tb[IFLA_WIRELESS]),
|
|
&iw_buf, &iw_buf_len);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
iw += IW_EV_POINT_OFF;
|
|
}
|
|
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
|
|
|
|
nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
|
|
if (nskb == NULL) {
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
|
|
NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in if_nlmsg_size */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(nskb);
|
|
goto errout;
|
|
}
|
|
err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
|
|
errout:
|
|
kfree(iw_buf);
|
|
dev_put(dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int idx;
|
|
int s_idx = cb->family;
|
|
|
|
if (s_idx == 0)
|
|
s_idx = 1;
|
|
for (idx=1; idx<NPROTO; idx++) {
|
|
int type = cb->nlh->nlmsg_type-RTM_BASE;
|
|
if (idx < s_idx || idx == PF_PACKET)
|
|
continue;
|
|
if (rtnetlink_links[idx] == NULL ||
|
|
rtnetlink_links[idx][type].dumpit == NULL)
|
|
continue;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[0], 0, sizeof(cb->args));
|
|
if (rtnetlink_links[idx][type].dumpit(skb, cb))
|
|
break;
|
|
}
|
|
cb->family = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in if_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(RTNLGRP_LINK, err);
|
|
}
|
|
|
|
/* Protected by RTNL sempahore. */
|
|
static struct rtattr **rta_buf;
|
|
static int rtattr_max;
|
|
|
|
/* Process one rtnetlink message. */
|
|
|
|
static __inline__ int
|
|
rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
|
|
{
|
|
struct rtnetlink_link *link;
|
|
struct rtnetlink_link *link_tab;
|
|
int sz_idx, kind;
|
|
int min_len;
|
|
int family;
|
|
int type;
|
|
int err;
|
|
|
|
/* Only requests are handled by kernel now */
|
|
if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
|
|
return 0;
|
|
|
|
type = nlh->nlmsg_type;
|
|
|
|
/* A control message: ignore them */
|
|
if (type < RTM_BASE)
|
|
return 0;
|
|
|
|
/* Unknown message: reply with EINVAL */
|
|
if (type > RTM_MAX)
|
|
goto err_inval;
|
|
|
|
type -= RTM_BASE;
|
|
|
|
/* All the messages must have at least 1 byte length */
|
|
if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
|
|
return 0;
|
|
|
|
family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
|
|
if (family >= NPROTO) {
|
|
*errp = -EAFNOSUPPORT;
|
|
return -1;
|
|
}
|
|
|
|
link_tab = rtnetlink_links[family];
|
|
if (link_tab == NULL)
|
|
link_tab = rtnetlink_links[PF_UNSPEC];
|
|
link = &link_tab[type];
|
|
|
|
sz_idx = type>>2;
|
|
kind = type&3;
|
|
|
|
if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
|
|
*errp = -EPERM;
|
|
return -1;
|
|
}
|
|
|
|
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
|
|
if (link->dumpit == NULL)
|
|
link = &(rtnetlink_links[PF_UNSPEC][type]);
|
|
|
|
if (link->dumpit == NULL)
|
|
goto err_inval;
|
|
|
|
if ((*errp = netlink_dump_start(rtnl, skb, nlh,
|
|
link->dumpit, NULL)) != 0) {
|
|
return -1;
|
|
}
|
|
|
|
netlink_queue_skip(nlh, skb);
|
|
return -1;
|
|
}
|
|
|
|
memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
|
|
|
|
min_len = rtm_min[sz_idx];
|
|
if (nlh->nlmsg_len < min_len)
|
|
goto err_inval;
|
|
|
|
if (nlh->nlmsg_len > min_len) {
|
|
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
|
|
struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
|
|
|
|
while (RTA_OK(attr, attrlen)) {
|
|
unsigned flavor = attr->rta_type;
|
|
if (flavor) {
|
|
if (flavor > rta_max[sz_idx])
|
|
goto err_inval;
|
|
rta_buf[flavor-1] = attr;
|
|
}
|
|
attr = RTA_NEXT(attr, attrlen);
|
|
}
|
|
}
|
|
|
|
if (link->doit == NULL)
|
|
link = &(rtnetlink_links[PF_UNSPEC][type]);
|
|
if (link->doit == NULL)
|
|
goto err_inval;
|
|
err = link->doit(skb, nlh, (void *)&rta_buf[0]);
|
|
|
|
*errp = err;
|
|
return err;
|
|
|
|
err_inval:
|
|
*errp = -EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
static void rtnetlink_rcv(struct sock *sk, int len)
|
|
{
|
|
unsigned int qlen = 0;
|
|
|
|
do {
|
|
mutex_lock(&rtnl_mutex);
|
|
netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
|
|
mutex_unlock(&rtnl_mutex);
|
|
|
|
netdev_run_todo();
|
|
} while (qlen);
|
|
}
|
|
|
|
static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
|
|
{
|
|
[RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
|
|
.dumpit = rtnl_dump_ifinfo },
|
|
[RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
|
|
[RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
|
|
[RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
|
|
[RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
|
|
[RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
|
|
[RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
|
|
#ifdef CONFIG_FIB_RULES
|
|
[RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
|
|
[RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
|
|
#endif
|
|
[RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
|
|
[RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
|
|
[RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
|
|
};
|
|
|
|
static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
switch (event) {
|
|
case NETDEV_UNREGISTER:
|
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
|
|
break;
|
|
case NETDEV_REGISTER:
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
|
|
break;
|
|
case NETDEV_UP:
|
|
case NETDEV_DOWN:
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
|
|
break;
|
|
case NETDEV_CHANGE:
|
|
case NETDEV_GOING_DOWN:
|
|
break;
|
|
default:
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block rtnetlink_dev_notifier = {
|
|
.notifier_call = rtnetlink_event,
|
|
};
|
|
|
|
void __init rtnetlink_init(void)
|
|
{
|
|
int i;
|
|
|
|
rtattr_max = 0;
|
|
for (i = 0; i < ARRAY_SIZE(rta_max); i++)
|
|
if (rta_max[i] > rtattr_max)
|
|
rtattr_max = rta_max[i];
|
|
rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
|
|
if (!rta_buf)
|
|
panic("rtnetlink_init: cannot allocate rta_buf\n");
|
|
|
|
rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
|
|
THIS_MODULE);
|
|
if (rtnl == NULL)
|
|
panic("rtnetlink_init: cannot initialize rtnetlink\n");
|
|
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
|
|
register_netdevice_notifier(&rtnetlink_dev_notifier);
|
|
rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
|
|
rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__rta_fill);
|
|
EXPORT_SYMBOL(rtattr_strlcpy);
|
|
EXPORT_SYMBOL(rtattr_parse);
|
|
EXPORT_SYMBOL(rtnetlink_links);
|
|
EXPORT_SYMBOL(rtnetlink_put_metrics);
|
|
EXPORT_SYMBOL(rtnl_lock);
|
|
EXPORT_SYMBOL(rtnl_trylock);
|
|
EXPORT_SYMBOL(rtnl_unlock);
|
|
EXPORT_SYMBOL(rtnl_unicast);
|
|
EXPORT_SYMBOL(rtnl_notify);
|
|
EXPORT_SYMBOL(rtnl_set_sk_err);
|