/*
|
/*
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
* operating system. INET is implemented using the BSD Socket
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* operating system. INET is implemented using the BSD Socket
|
* interface as the means of communication with the user level.
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* interface as the means of communication with the user level.
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*
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*
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* Routing netlink socket interface: protocol independent part.
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* Routing netlink socket interface: protocol independent part.
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*
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*
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* This program is free software; you can redistribute it and/or
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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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* 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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* 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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* 2 of the License, or (at your option) any later version.
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*
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*
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* Fixes:
|
* Fixes:
|
* Vitaly E. Lavrov RTA_OK arithmetics was wrong.
|
* Vitaly E. Lavrov RTA_OK arithmetics was wrong.
|
*/
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*/
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|
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#include <linux/config.h>
|
#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/types.h>
|
#include <linux/socket.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/major.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/net.h>
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#include <linux/fcntl.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
|
#include <linux/slab.h>
|
#include <linux/interrupt.h>
|
#include <linux/interrupt.h>
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#include <linux/capability.h>
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#include <linux/capability.h>
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#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/init.h>
|
|
|
#include <asm/uaccess.h>
|
#include <asm/uaccess.h>
|
#include <asm/system.h>
|
#include <asm/system.h>
|
#include <asm/string.h>
|
#include <asm/string.h>
|
|
|
#include <linux/inet.h>
|
#include <linux/inet.h>
|
#include <linux/netdevice.h>
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#include <linux/netdevice.h>
|
#include <net/ip.h>
|
#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/protocol.h>
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#include <net/arp.h>
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#include <net/arp.h>
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#include <net/route.h>
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#include <net/route.h>
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#include <net/udp.h>
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#include <net/udp.h>
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#include <net/sock.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_sched.h>
|
|
|
DECLARE_MUTEX(rtnl_sem);
|
DECLARE_MUTEX(rtnl_sem);
|
|
|
void rtnl_lock(void)
|
void rtnl_lock(void)
|
{
|
{
|
rtnl_shlock();
|
rtnl_shlock();
|
rtnl_exlock();
|
rtnl_exlock();
|
}
|
}
|
|
|
void rtnl_unlock(void)
|
void rtnl_unlock(void)
|
{
|
{
|
rtnl_exunlock();
|
rtnl_exunlock();
|
rtnl_shunlock();
|
rtnl_shunlock();
|
}
|
}
|
|
|
int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
|
int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
|
{
|
{
|
memset(tb, 0, sizeof(struct rtattr*)*maxattr);
|
memset(tb, 0, sizeof(struct rtattr*)*maxattr);
|
|
|
while (RTA_OK(rta, len)) {
|
while (RTA_OK(rta, len)) {
|
unsigned flavor = rta->rta_type;
|
unsigned flavor = rta->rta_type;
|
if (flavor && flavor <= maxattr)
|
if (flavor && flavor <= maxattr)
|
tb[flavor-1] = rta;
|
tb[flavor-1] = rta;
|
rta = RTA_NEXT(rta, len);
|
rta = RTA_NEXT(rta, len);
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
struct sock *rtnl;
|
struct sock *rtnl;
|
|
|
struct rtnetlink_link * rtnetlink_links[NPROTO];
|
struct rtnetlink_link * rtnetlink_links[NPROTO];
|
|
|
static const int rtm_min[(RTM_MAX+1-RTM_BASE)/4] =
|
static const int rtm_min[(RTM_MAX+1-RTM_BASE)/4] =
|
{
|
{
|
NLMSG_LENGTH(sizeof(struct ifinfomsg)),
|
NLMSG_LENGTH(sizeof(struct ifinfomsg)),
|
NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
|
NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
|
NLMSG_LENGTH(sizeof(struct rtmsg)),
|
NLMSG_LENGTH(sizeof(struct rtmsg)),
|
NLMSG_LENGTH(sizeof(struct ndmsg)),
|
NLMSG_LENGTH(sizeof(struct ndmsg)),
|
NLMSG_LENGTH(sizeof(struct rtmsg)),
|
NLMSG_LENGTH(sizeof(struct rtmsg)),
|
NLMSG_LENGTH(sizeof(struct tcmsg)),
|
NLMSG_LENGTH(sizeof(struct tcmsg)),
|
NLMSG_LENGTH(sizeof(struct tcmsg)),
|
NLMSG_LENGTH(sizeof(struct tcmsg)),
|
NLMSG_LENGTH(sizeof(struct tcmsg))
|
NLMSG_LENGTH(sizeof(struct tcmsg))
|
};
|
};
|
|
|
static const int rta_max[(RTM_MAX+1-RTM_BASE)/4] =
|
static const int rta_max[(RTM_MAX+1-RTM_BASE)/4] =
|
{
|
{
|
IFLA_MAX,
|
IFLA_MAX,
|
IFA_MAX,
|
IFA_MAX,
|
RTA_MAX,
|
RTA_MAX,
|
NDA_MAX,
|
NDA_MAX,
|
RTA_MAX,
|
RTA_MAX,
|
TCA_MAX,
|
TCA_MAX,
|
TCA_MAX,
|
TCA_MAX,
|
TCA_MAX
|
TCA_MAX
|
};
|
};
|
|
|
void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
|
void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
|
{
|
{
|
struct rtattr *rta;
|
struct rtattr *rta;
|
int size = RTA_LENGTH(attrlen);
|
int size = RTA_LENGTH(attrlen);
|
|
|
rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
|
rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
|
rta->rta_type = attrtype;
|
rta->rta_type = attrtype;
|
rta->rta_len = size;
|
rta->rta_len = size;
|
memcpy(RTA_DATA(rta), data, attrlen);
|
memcpy(RTA_DATA(rta), data, attrlen);
|
}
|
}
|
|
|
int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
|
int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
|
{
|
{
|
int err = 0;
|
int err = 0;
|
|
|
NETLINK_CB(skb).dst_groups = group;
|
NETLINK_CB(skb).dst_groups = group;
|
if (echo)
|
if (echo)
|
atomic_inc(&skb->users);
|
atomic_inc(&skb->users);
|
netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
|
netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
|
if (echo)
|
if (echo)
|
err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
|
err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
|
return err;
|
return err;
|
}
|
}
|
|
|
int rtnetlink_put_metrics(struct sk_buff *skb, unsigned *metrics)
|
int rtnetlink_put_metrics(struct sk_buff *skb, unsigned *metrics)
|
{
|
{
|
struct rtattr *mx = (struct rtattr*)skb->tail;
|
struct rtattr *mx = (struct rtattr*)skb->tail;
|
int i;
|
int i;
|
|
|
RTA_PUT(skb, RTA_METRICS, 0, NULL);
|
RTA_PUT(skb, RTA_METRICS, 0, NULL);
|
for (i=0; i<RTAX_MAX; i++) {
|
for (i=0; i<RTAX_MAX; i++) {
|
if (metrics[i])
|
if (metrics[i])
|
RTA_PUT(skb, i+1, sizeof(unsigned), metrics+i);
|
RTA_PUT(skb, i+1, sizeof(unsigned), metrics+i);
|
}
|
}
|
mx->rta_len = skb->tail - (u8*)mx;
|
mx->rta_len = skb->tail - (u8*)mx;
|
if (mx->rta_len == RTA_LENGTH(0))
|
if (mx->rta_len == RTA_LENGTH(0))
|
skb_trim(skb, (u8*)mx - skb->data);
|
skb_trim(skb, (u8*)mx - skb->data);
|
return 0;
|
return 0;
|
|
|
rtattr_failure:
|
rtattr_failure:
|
skb_trim(skb, (u8*)mx - skb->data);
|
skb_trim(skb, (u8*)mx - skb->data);
|
return -1;
|
return -1;
|
}
|
}
|
|
|
|
|
static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
|
static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
|
int type, u32 pid, u32 seq, u32 change)
|
int type, u32 pid, u32 seq, u32 change)
|
{
|
{
|
struct ifinfomsg *r;
|
struct ifinfomsg *r;
|
struct nlmsghdr *nlh;
|
struct nlmsghdr *nlh;
|
unsigned char *b = skb->tail;
|
unsigned char *b = skb->tail;
|
|
|
nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*r));
|
nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*r));
|
if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
|
if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
|
r = NLMSG_DATA(nlh);
|
r = NLMSG_DATA(nlh);
|
r->ifi_family = AF_UNSPEC;
|
r->ifi_family = AF_UNSPEC;
|
r->ifi_type = dev->type;
|
r->ifi_type = dev->type;
|
r->ifi_index = dev->ifindex;
|
r->ifi_index = dev->ifindex;
|
r->ifi_flags = dev->flags;
|
r->ifi_flags = dev->flags;
|
r->ifi_change = change;
|
r->ifi_change = change;
|
|
|
if (!netif_running(dev) || !netif_carrier_ok(dev))
|
if (!netif_running(dev) || !netif_carrier_ok(dev))
|
r->ifi_flags &= ~IFF_RUNNING;
|
r->ifi_flags &= ~IFF_RUNNING;
|
else
|
else
|
r->ifi_flags |= IFF_RUNNING;
|
r->ifi_flags |= IFF_RUNNING;
|
|
|
RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
|
RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
|
if (dev->addr_len) {
|
if (dev->addr_len) {
|
RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
|
RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
|
RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
|
RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
|
}
|
}
|
if (1) {
|
if (1) {
|
unsigned mtu = dev->mtu;
|
unsigned mtu = dev->mtu;
|
RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
|
RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
|
}
|
}
|
if (dev->ifindex != dev->iflink)
|
if (dev->ifindex != dev->iflink)
|
RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
|
RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
|
if (dev->qdisc_sleeping)
|
if (dev->qdisc_sleeping)
|
RTA_PUT(skb, IFLA_QDISC,
|
RTA_PUT(skb, IFLA_QDISC,
|
strlen(dev->qdisc_sleeping->ops->id) + 1,
|
strlen(dev->qdisc_sleeping->ops->id) + 1,
|
dev->qdisc_sleeping->ops->id);
|
dev->qdisc_sleeping->ops->id);
|
if (dev->master)
|
if (dev->master)
|
RTA_PUT(skb, IFLA_MASTER, sizeof(int), &dev->master->ifindex);
|
RTA_PUT(skb, IFLA_MASTER, sizeof(int), &dev->master->ifindex);
|
if (dev->get_stats) {
|
if (dev->get_stats) {
|
struct net_device_stats *stats = dev->get_stats(dev);
|
struct net_device_stats *stats = dev->get_stats(dev);
|
if (stats)
|
if (stats)
|
RTA_PUT(skb, IFLA_STATS, sizeof(*stats), stats);
|
RTA_PUT(skb, IFLA_STATS, sizeof(*stats), stats);
|
}
|
}
|
nlh->nlmsg_len = skb->tail - b;
|
nlh->nlmsg_len = skb->tail - b;
|
return skb->len;
|
return skb->len;
|
|
|
nlmsg_failure:
|
nlmsg_failure:
|
rtattr_failure:
|
rtattr_failure:
|
skb_trim(skb, b - skb->data);
|
skb_trim(skb, b - skb->data);
|
return -1;
|
return -1;
|
}
|
}
|
|
|
int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
|
int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
{
|
int idx;
|
int idx;
|
int s_idx = cb->args[0];
|
int s_idx = cb->args[0];
|
struct net_device *dev;
|
struct net_device *dev;
|
|
|
read_lock(&dev_base_lock);
|
read_lock(&dev_base_lock);
|
for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
|
for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
|
if (idx < s_idx)
|
if (idx < s_idx)
|
continue;
|
continue;
|
if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 0) <= 0)
|
if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 0) <= 0)
|
break;
|
break;
|
}
|
}
|
read_unlock(&dev_base_lock);
|
read_unlock(&dev_base_lock);
|
cb->args[0] = idx;
|
cb->args[0] = idx;
|
|
|
return skb->len;
|
return skb->len;
|
}
|
}
|
|
|
int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
|
int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
{
|
int idx;
|
int idx;
|
int s_idx = cb->family;
|
int s_idx = cb->family;
|
|
|
if (s_idx == 0)
|
if (s_idx == 0)
|
s_idx = 1;
|
s_idx = 1;
|
for (idx=1; idx<NPROTO; idx++) {
|
for (idx=1; idx<NPROTO; idx++) {
|
int type = cb->nlh->nlmsg_type-RTM_BASE;
|
int type = cb->nlh->nlmsg_type-RTM_BASE;
|
if (idx < s_idx || idx == PF_PACKET)
|
if (idx < s_idx || idx == PF_PACKET)
|
continue;
|
continue;
|
if (rtnetlink_links[idx] == NULL ||
|
if (rtnetlink_links[idx] == NULL ||
|
rtnetlink_links[idx][type].dumpit == NULL)
|
rtnetlink_links[idx][type].dumpit == NULL)
|
continue;
|
continue;
|
if (idx > s_idx)
|
if (idx > s_idx)
|
memset(&cb->args[0], 0, sizeof(cb->args));
|
memset(&cb->args[0], 0, sizeof(cb->args));
|
if (rtnetlink_links[idx][type].dumpit(skb, cb))
|
if (rtnetlink_links[idx][type].dumpit(skb, cb))
|
break;
|
break;
|
}
|
}
|
cb->family = idx;
|
cb->family = idx;
|
|
|
return skb->len;
|
return skb->len;
|
}
|
}
|
|
|
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
|
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
|
{
|
{
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
int size = NLMSG_GOODSIZE;
|
int size = NLMSG_GOODSIZE;
|
|
|
skb = alloc_skb(size, GFP_KERNEL);
|
skb = alloc_skb(size, GFP_KERNEL);
|
if (!skb)
|
if (!skb)
|
return;
|
return;
|
|
|
if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change) < 0) {
|
if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change) < 0) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return;
|
return;
|
}
|
}
|
NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
|
NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
|
netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL);
|
netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL);
|
}
|
}
|
|
|
static int rtnetlink_done(struct netlink_callback *cb)
|
static int rtnetlink_done(struct netlink_callback *cb)
|
{
|
{
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Process one rtnetlink message. */
|
/* Process one rtnetlink message. */
|
|
|
static __inline__ int
|
static __inline__ int
|
rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
|
rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
|
{
|
{
|
struct rtnetlink_link *link;
|
struct rtnetlink_link *link;
|
struct rtnetlink_link *link_tab;
|
struct rtnetlink_link *link_tab;
|
struct rtattr *rta[RTATTR_MAX];
|
struct rtattr *rta[RTATTR_MAX];
|
|
|
int exclusive = 0;
|
int exclusive = 0;
|
int sz_idx, kind;
|
int sz_idx, kind;
|
int min_len;
|
int min_len;
|
int family;
|
int family;
|
int type;
|
int type;
|
int err;
|
int err;
|
|
|
/* Only requests are handled by kernel now */
|
/* Only requests are handled by kernel now */
|
if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
|
if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
|
return 0;
|
return 0;
|
|
|
type = nlh->nlmsg_type;
|
type = nlh->nlmsg_type;
|
|
|
/* A control message: ignore them */
|
/* A control message: ignore them */
|
if (type < RTM_BASE)
|
if (type < RTM_BASE)
|
return 0;
|
return 0;
|
|
|
/* Unknown message: reply with EINVAL */
|
/* Unknown message: reply with EINVAL */
|
if (type > RTM_MAX)
|
if (type > RTM_MAX)
|
goto err_inval;
|
goto err_inval;
|
|
|
type -= RTM_BASE;
|
type -= RTM_BASE;
|
|
|
/* All the messages must have at least 1 byte length */
|
/* All the messages must have at least 1 byte length */
|
if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
|
if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
|
return 0;
|
return 0;
|
|
|
family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
|
family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
|
if (family > NPROTO) {
|
if (family > NPROTO) {
|
*errp = -EAFNOSUPPORT;
|
*errp = -EAFNOSUPPORT;
|
return -1;
|
return -1;
|
}
|
}
|
|
|
link_tab = rtnetlink_links[family];
|
link_tab = rtnetlink_links[family];
|
if (link_tab == NULL)
|
if (link_tab == NULL)
|
link_tab = rtnetlink_links[PF_UNSPEC];
|
link_tab = rtnetlink_links[PF_UNSPEC];
|
link = &link_tab[type];
|
link = &link_tab[type];
|
|
|
sz_idx = type>>2;
|
sz_idx = type>>2;
|
kind = type&3;
|
kind = type&3;
|
|
|
if (kind != 2 && !cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)) {
|
if (kind != 2 && !cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)) {
|
*errp = -EPERM;
|
*errp = -EPERM;
|
return -1;
|
return -1;
|
}
|
}
|
|
|
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
|
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
|
u32 rlen;
|
u32 rlen;
|
|
|
if (link->dumpit == NULL)
|
if (link->dumpit == NULL)
|
link = &(rtnetlink_links[PF_UNSPEC][type]);
|
link = &(rtnetlink_links[PF_UNSPEC][type]);
|
|
|
if (link->dumpit == NULL)
|
if (link->dumpit == NULL)
|
goto err_inval;
|
goto err_inval;
|
|
|
if ((*errp = netlink_dump_start(rtnl, skb, nlh,
|
if ((*errp = netlink_dump_start(rtnl, skb, nlh,
|
link->dumpit,
|
link->dumpit,
|
rtnetlink_done)) != 0) {
|
rtnetlink_done)) != 0) {
|
return -1;
|
return -1;
|
}
|
}
|
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
if (rlen > skb->len)
|
if (rlen > skb->len)
|
rlen = skb->len;
|
rlen = skb->len;
|
skb_pull(skb, rlen);
|
skb_pull(skb, rlen);
|
return -1;
|
return -1;
|
}
|
}
|
|
|
if (kind != 2) {
|
if (kind != 2) {
|
if (rtnl_exlock_nowait()) {
|
if (rtnl_exlock_nowait()) {
|
*errp = 0;
|
*errp = 0;
|
return -1;
|
return -1;
|
}
|
}
|
exclusive = 1;
|
exclusive = 1;
|
}
|
}
|
|
|
memset(&rta, 0, sizeof(rta));
|
memset(&rta, 0, sizeof(rta));
|
|
|
min_len = rtm_min[sz_idx];
|
min_len = rtm_min[sz_idx];
|
if (nlh->nlmsg_len < min_len)
|
if (nlh->nlmsg_len < min_len)
|
goto err_inval;
|
goto err_inval;
|
|
|
if (nlh->nlmsg_len > min_len) {
|
if (nlh->nlmsg_len > min_len) {
|
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
|
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
|
struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
|
struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
|
|
|
while (RTA_OK(attr, attrlen)) {
|
while (RTA_OK(attr, attrlen)) {
|
unsigned flavor = attr->rta_type;
|
unsigned flavor = attr->rta_type;
|
if (flavor) {
|
if (flavor) {
|
if (flavor > rta_max[sz_idx])
|
if (flavor > rta_max[sz_idx])
|
goto err_inval;
|
goto err_inval;
|
rta[flavor-1] = attr;
|
rta[flavor-1] = attr;
|
}
|
}
|
attr = RTA_NEXT(attr, attrlen);
|
attr = RTA_NEXT(attr, attrlen);
|
}
|
}
|
}
|
}
|
|
|
if (link->doit == NULL)
|
if (link->doit == NULL)
|
link = &(rtnetlink_links[PF_UNSPEC][type]);
|
link = &(rtnetlink_links[PF_UNSPEC][type]);
|
if (link->doit == NULL)
|
if (link->doit == NULL)
|
goto err_inval;
|
goto err_inval;
|
err = link->doit(skb, nlh, (void *)&rta);
|
err = link->doit(skb, nlh, (void *)&rta);
|
|
|
if (exclusive)
|
if (exclusive)
|
rtnl_exunlock();
|
rtnl_exunlock();
|
*errp = err;
|
*errp = err;
|
return err;
|
return err;
|
|
|
err_inval:
|
err_inval:
|
if (exclusive)
|
if (exclusive)
|
rtnl_exunlock();
|
rtnl_exunlock();
|
*errp = -EINVAL;
|
*errp = -EINVAL;
|
return -1;
|
return -1;
|
}
|
}
|
|
|
/*
|
/*
|
* Process one packet of messages.
|
* Process one packet of messages.
|
* Malformed skbs with wrong lengths of messages are discarded silently.
|
* Malformed skbs with wrong lengths of messages are discarded silently.
|
*/
|
*/
|
|
|
static inline int rtnetlink_rcv_skb(struct sk_buff *skb)
|
static inline int rtnetlink_rcv_skb(struct sk_buff *skb)
|
{
|
{
|
int err;
|
int err;
|
struct nlmsghdr * nlh;
|
struct nlmsghdr * nlh;
|
|
|
while (skb->len >= NLMSG_SPACE(0)) {
|
while (skb->len >= NLMSG_SPACE(0)) {
|
u32 rlen;
|
u32 rlen;
|
|
|
nlh = (struct nlmsghdr *)skb->data;
|
nlh = (struct nlmsghdr *)skb->data;
|
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
|
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
|
return 0;
|
return 0;
|
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
if (rlen > skb->len)
|
if (rlen > skb->len)
|
rlen = skb->len;
|
rlen = skb->len;
|
if (rtnetlink_rcv_msg(skb, nlh, &err)) {
|
if (rtnetlink_rcv_msg(skb, nlh, &err)) {
|
/* Not error, but we must interrupt processing here:
|
/* Not error, but we must interrupt processing here:
|
* Note, that in this case we do not pull message
|
* Note, that in this case we do not pull message
|
* from skb, it will be processed later.
|
* from skb, it will be processed later.
|
*/
|
*/
|
if (err == 0)
|
if (err == 0)
|
return -1;
|
return -1;
|
netlink_ack(skb, nlh, err);
|
netlink_ack(skb, nlh, err);
|
} else if (nlh->nlmsg_flags&NLM_F_ACK)
|
} else if (nlh->nlmsg_flags&NLM_F_ACK)
|
netlink_ack(skb, nlh, 0);
|
netlink_ack(skb, nlh, 0);
|
skb_pull(skb, rlen);
|
skb_pull(skb, rlen);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* rtnetlink input queue processing routine:
|
* rtnetlink input queue processing routine:
|
* - try to acquire shared lock. If it is failed, defer processing.
|
* - try to acquire shared lock. If it is failed, defer processing.
|
* - feed skbs to rtnetlink_rcv_skb, until it refuse a message,
|
* - feed skbs to rtnetlink_rcv_skb, until it refuse a message,
|
* that will occur, when a dump started and/or acquisition of
|
* that will occur, when a dump started and/or acquisition of
|
* exclusive lock failed.
|
* exclusive lock failed.
|
*/
|
*/
|
|
|
static void rtnetlink_rcv(struct sock *sk, int len)
|
static void rtnetlink_rcv(struct sock *sk, int len)
|
{
|
{
|
do {
|
do {
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
|
|
if (rtnl_shlock_nowait())
|
if (rtnl_shlock_nowait())
|
return;
|
return;
|
|
|
while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
|
while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
|
if (rtnetlink_rcv_skb(skb)) {
|
if (rtnetlink_rcv_skb(skb)) {
|
if (skb->len)
|
if (skb->len)
|
skb_queue_head(&sk->receive_queue, skb);
|
skb_queue_head(&sk->receive_queue, skb);
|
else
|
else
|
kfree_skb(skb);
|
kfree_skb(skb);
|
break;
|
break;
|
}
|
}
|
kfree_skb(skb);
|
kfree_skb(skb);
|
}
|
}
|
|
|
up(&rtnl_sem);
|
up(&rtnl_sem);
|
} while (rtnl && rtnl->receive_queue.qlen);
|
} while (rtnl && rtnl->receive_queue.qlen);
|
}
|
}
|
|
|
static struct rtnetlink_link link_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
|
static struct rtnetlink_link link_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
|
{
|
{
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, rtnetlink_dump_ifinfo, },
|
{ NULL, rtnetlink_dump_ifinfo, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
|
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, rtnetlink_dump_all, },
|
{ NULL, rtnetlink_dump_all, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
|
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, rtnetlink_dump_all, },
|
{ NULL, rtnetlink_dump_all, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
|
|
{ neigh_add, NULL, },
|
{ neigh_add, NULL, },
|
{ neigh_delete, NULL, },
|
{ neigh_delete, NULL, },
|
{ NULL, neigh_dump_info, },
|
{ NULL, neigh_dump_info, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
|
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
{ NULL, NULL, },
|
};
|
};
|
|
|
|
|
static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
|
static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
|
{
|
{
|
struct net_device *dev = ptr;
|
struct net_device *dev = ptr;
|
switch (event) {
|
switch (event) {
|
case NETDEV_UNREGISTER:
|
case NETDEV_UNREGISTER:
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
|
break;
|
break;
|
case NETDEV_REGISTER:
|
case NETDEV_REGISTER:
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
|
break;
|
break;
|
case NETDEV_UP:
|
case NETDEV_UP:
|
case NETDEV_DOWN:
|
case NETDEV_DOWN:
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
|
break;
|
break;
|
case NETDEV_CHANGE:
|
case NETDEV_CHANGE:
|
case NETDEV_GOING_DOWN:
|
case NETDEV_GOING_DOWN:
|
break;
|
break;
|
default:
|
default:
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
|
break;
|
break;
|
}
|
}
|
return NOTIFY_DONE;
|
return NOTIFY_DONE;
|
}
|
}
|
|
|
struct notifier_block rtnetlink_dev_notifier = {
|
struct notifier_block rtnetlink_dev_notifier = {
|
rtnetlink_event,
|
rtnetlink_event,
|
NULL,
|
NULL,
|
0
|
0
|
};
|
};
|
|
|
|
|
void __init rtnetlink_init(void)
|
void __init rtnetlink_init(void)
|
{
|
{
|
#ifdef RTNL_DEBUG
|
#ifdef RTNL_DEBUG
|
printk("Initializing RT netlink socket\n");
|
printk("Initializing RT netlink socket\n");
|
#endif
|
#endif
|
rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv);
|
rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv);
|
if (rtnl == NULL)
|
if (rtnl == NULL)
|
panic("rtnetlink_init: cannot initialize rtnetlink\n");
|
panic("rtnetlink_init: cannot initialize rtnetlink\n");
|
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
|
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
|
register_netdevice_notifier(&rtnetlink_dev_notifier);
|
register_netdevice_notifier(&rtnetlink_dev_notifier);
|
rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
|
rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
|
rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
|
rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
|
}
|
}
|
|
|
