kernel_optimize_test/net/core/rtnetlink.c
Eric Paris fd77846152 security: remove the security_netlink_recv hook as it is equivalent to capable()
Once upon a time netlink was not sync and we had to get the effective
capabilities from the skb that was being received.  Today we instead get
the capabilities from the current task.  This has rendered the entire
purpose of the hook moot as it is now functionally equivalent to the
capable() call.

Signed-off-by: Eric Paris <eparis@redhat.com>
2012-01-05 18:53:01 -05:00

2073 lines
49 KiB
C

/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Routing netlink socket interface: protocol independent part.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Fixes:
* Vitaly E. Lavrov RTA_OK arithmetics was wrong.
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/capability.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/security.h>
#include <linux/mutex.h>
#include <linux/if_addr.h>
#include <linux/pci.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/arp.h>
#include <net/route.h>
#include <net/udp.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include <net/fib_rules.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
struct rtnl_link {
rtnl_doit_func doit;
rtnl_dumpit_func dumpit;
rtnl_calcit_func calcit;
};
static DEFINE_MUTEX(rtnl_mutex);
static u16 min_ifinfo_dump_size;
void rtnl_lock(void)
{
mutex_lock(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_lock);
void __rtnl_unlock(void)
{
mutex_unlock(&rtnl_mutex);
}
void rtnl_unlock(void)
{
/* This fellow will unlock it for us. */
netdev_run_todo();
}
EXPORT_SYMBOL(rtnl_unlock);
int rtnl_trylock(void)
{
return mutex_trylock(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_trylock);
int rtnl_is_locked(void)
{
return mutex_is_locked(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_is_locked);
#ifdef CONFIG_PROVE_LOCKING
int lockdep_rtnl_is_held(void)
{
return lockdep_is_held(&rtnl_mutex);
}
EXPORT_SYMBOL(lockdep_rtnl_is_held);
#endif /* #ifdef CONFIG_PROVE_LOCKING */
static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
static inline int rtm_msgindex(int msgtype)
{
int msgindex = msgtype - RTM_BASE;
/*
* msgindex < 0 implies someone tried to register a netlink
* control code. msgindex >= RTM_NR_MSGTYPES may indicate that
* the message type has not been added to linux/rtnetlink.h
*/
BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
return msgindex;
}
static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
{
struct rtnl_link *tab;
if (protocol <= RTNL_FAMILY_MAX)
tab = rtnl_msg_handlers[protocol];
else
tab = NULL;
if (tab == NULL || tab[msgindex].doit == NULL)
tab = rtnl_msg_handlers[PF_UNSPEC];
return tab ? tab[msgindex].doit : NULL;
}
static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
{
struct rtnl_link *tab;
if (protocol <= RTNL_FAMILY_MAX)
tab = rtnl_msg_handlers[protocol];
else
tab = NULL;
if (tab == NULL || tab[msgindex].dumpit == NULL)
tab = rtnl_msg_handlers[PF_UNSPEC];
return tab ? tab[msgindex].dumpit : NULL;
}
static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
{
struct rtnl_link *tab;
if (protocol <= RTNL_FAMILY_MAX)
tab = rtnl_msg_handlers[protocol];
else
tab = NULL;
if (tab == NULL || tab[msgindex].calcit == NULL)
tab = rtnl_msg_handlers[PF_UNSPEC];
return tab ? tab[msgindex].calcit : NULL;
}
/**
* __rtnl_register - Register a rtnetlink message type
* @protocol: Protocol family or PF_UNSPEC
* @msgtype: rtnetlink message type
* @doit: Function pointer called for each request message
* @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
* @calcit: Function pointer to calc size of dump message
*
* Registers the specified function pointers (at least one of them has
* to be non-NULL) to be called whenever a request message for the
* specified protocol family and message type is received.
*
* The special protocol family PF_UNSPEC may be used to define fallback
* function pointers for the case when no entry for the specific protocol
* family exists.
*
* Returns 0 on success or a negative error code.
*/
int __rtnl_register(int protocol, int msgtype,
rtnl_doit_func doit, rtnl_dumpit_func dumpit,
rtnl_calcit_func calcit)
{
struct rtnl_link *tab;
int msgindex;
BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
msgindex = rtm_msgindex(msgtype);
tab = rtnl_msg_handlers[protocol];
if (tab == NULL) {
tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
if (tab == NULL)
return -ENOBUFS;
rtnl_msg_handlers[protocol] = tab;
}
if (doit)
tab[msgindex].doit = doit;
if (dumpit)
tab[msgindex].dumpit = dumpit;
if (calcit)
tab[msgindex].calcit = calcit;
return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_register);
/**
* rtnl_register - Register a rtnetlink message type
*
* Identical to __rtnl_register() but panics on failure. This is useful
* as failure of this function is very unlikely, it can only happen due
* to lack of memory when allocating the chain to store all message
* handlers for a protocol. Meant for use in init functions where lack
* of memory implies no sense in continuing.
*/
void rtnl_register(int protocol, int msgtype,
rtnl_doit_func doit, rtnl_dumpit_func dumpit,
rtnl_calcit_func calcit)
{
if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
panic("Unable to register rtnetlink message handler, "
"protocol = %d, message type = %d\n",
protocol, msgtype);
}
EXPORT_SYMBOL_GPL(rtnl_register);
/**
* rtnl_unregister - Unregister a rtnetlink message type
* @protocol: Protocol family or PF_UNSPEC
* @msgtype: rtnetlink message type
*
* Returns 0 on success or a negative error code.
*/
int rtnl_unregister(int protocol, int msgtype)
{
int msgindex;
BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
msgindex = rtm_msgindex(msgtype);
if (rtnl_msg_handlers[protocol] == NULL)
return -ENOENT;
rtnl_msg_handlers[protocol][msgindex].doit = NULL;
rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
return 0;
}
EXPORT_SYMBOL_GPL(rtnl_unregister);
/**
* rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
* @protocol : Protocol family or PF_UNSPEC
*
* Identical to calling rtnl_unregster() for all registered message types
* of a certain protocol family.
*/
void rtnl_unregister_all(int protocol)
{
BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
kfree(rtnl_msg_handlers[protocol]);
rtnl_msg_handlers[protocol] = NULL;
}
EXPORT_SYMBOL_GPL(rtnl_unregister_all);
static LIST_HEAD(link_ops);
/**
* __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
* @ops: struct rtnl_link_ops * to register
*
* The caller must hold the rtnl_mutex. This function should be used
* by drivers that create devices during module initialization. It
* must be called before registering the devices.
*
* Returns 0 on success or a negative error code.
*/
int __rtnl_link_register(struct rtnl_link_ops *ops)
{
if (!ops->dellink)
ops->dellink = unregister_netdevice_queue;
list_add_tail(&ops->list, &link_ops);
return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_link_register);
/**
* rtnl_link_register - Register rtnl_link_ops with rtnetlink.
* @ops: struct rtnl_link_ops * to register
*
* Returns 0 on success or a negative error code.
*/
int rtnl_link_register(struct rtnl_link_ops *ops)
{
int err;
rtnl_lock();
err = __rtnl_link_register(ops);
rtnl_unlock();
return err;
}
EXPORT_SYMBOL_GPL(rtnl_link_register);
static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
{
struct net_device *dev;
LIST_HEAD(list_kill);
for_each_netdev(net, dev) {
if (dev->rtnl_link_ops == ops)
ops->dellink(dev, &list_kill);
}
unregister_netdevice_many(&list_kill);
}
/**
* __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
* @ops: struct rtnl_link_ops * to unregister
*
* The caller must hold the rtnl_mutex.
*/
void __rtnl_link_unregister(struct rtnl_link_ops *ops)
{
struct net *net;
for_each_net(net) {
__rtnl_kill_links(net, ops);
}
list_del(&ops->list);
}
EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
/**
* rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
* @ops: struct rtnl_link_ops * to unregister
*/
void rtnl_link_unregister(struct rtnl_link_ops *ops)
{
rtnl_lock();
__rtnl_link_unregister(ops);
rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_link_unregister);
static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
{
const struct rtnl_link_ops *ops;
list_for_each_entry(ops, &link_ops, list) {
if (!strcmp(ops->kind, kind))
return ops;
}
return NULL;
}
static size_t rtnl_link_get_size(const struct net_device *dev)
{
const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
size_t size;
if (!ops)
return 0;
size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
if (ops->get_size)
/* IFLA_INFO_DATA + nested data */
size += nla_total_size(sizeof(struct nlattr)) +
ops->get_size(dev);
if (ops->get_xstats_size)
/* IFLA_INFO_XSTATS */
size += nla_total_size(ops->get_xstats_size(dev));
return size;
}
static LIST_HEAD(rtnl_af_ops);
static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
{
const struct rtnl_af_ops *ops;
list_for_each_entry(ops, &rtnl_af_ops, list) {
if (ops->family == family)
return ops;
}
return NULL;
}
/**
* __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
* @ops: struct rtnl_af_ops * to register
*
* The caller must hold the rtnl_mutex.
*
* Returns 0 on success or a negative error code.
*/
int __rtnl_af_register(struct rtnl_af_ops *ops)
{
list_add_tail(&ops->list, &rtnl_af_ops);
return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_af_register);
/**
* rtnl_af_register - Register rtnl_af_ops with rtnetlink.
* @ops: struct rtnl_af_ops * to register
*
* Returns 0 on success or a negative error code.
*/
int rtnl_af_register(struct rtnl_af_ops *ops)
{
int err;
rtnl_lock();
err = __rtnl_af_register(ops);
rtnl_unlock();
return err;
}
EXPORT_SYMBOL_GPL(rtnl_af_register);
/**
* __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
* @ops: struct rtnl_af_ops * to unregister
*
* The caller must hold the rtnl_mutex.
*/
void __rtnl_af_unregister(struct rtnl_af_ops *ops)
{
list_del(&ops->list);
}
EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
/**
* rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
* @ops: struct rtnl_af_ops * to unregister
*/
void rtnl_af_unregister(struct rtnl_af_ops *ops)
{
rtnl_lock();
__rtnl_af_unregister(ops);
rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_af_unregister);
static size_t rtnl_link_get_af_size(const struct net_device *dev)
{
struct rtnl_af_ops *af_ops;
size_t size;
/* IFLA_AF_SPEC */
size = nla_total_size(sizeof(struct nlattr));
list_for_each_entry(af_ops, &rtnl_af_ops, list) {
if (af_ops->get_link_af_size) {
/* AF_* + nested data */
size += nla_total_size(sizeof(struct nlattr)) +
af_ops->get_link_af_size(dev);
}
}
return size;
}
static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
{
const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
struct nlattr *linkinfo, *data;
int err = -EMSGSIZE;
linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
if (linkinfo == NULL)
goto out;
if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
goto err_cancel_link;
if (ops->fill_xstats) {
err = ops->fill_xstats(skb, dev);
if (err < 0)
goto err_cancel_link;
}
if (ops->fill_info) {
data = nla_nest_start(skb, IFLA_INFO_DATA);
if (data == NULL)
goto err_cancel_link;
err = ops->fill_info(skb, dev);
if (err < 0)
goto err_cancel_data;
nla_nest_end(skb, data);
}
nla_nest_end(skb, linkinfo);
return 0;
err_cancel_data:
nla_nest_cancel(skb, data);
err_cancel_link:
nla_nest_cancel(skb, linkinfo);
out:
return err;
}
static const int rtm_min[RTM_NR_FAMILIES] =
{
[RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
[RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
[RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
[RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
[RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
[RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
};
static const int rta_max[RTM_NR_FAMILIES] =
{
[RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
[RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
[RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
[RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
[RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
[RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
[RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
[RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
};
void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
{
struct rtattr *rta;
int size = RTA_LENGTH(attrlen);
rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
rta->rta_type = attrtype;
rta->rta_len = size;
memcpy(RTA_DATA(rta), data, attrlen);
memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
}
EXPORT_SYMBOL(__rta_fill);
int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
{
struct sock *rtnl = net->rtnl;
int err = 0;
NETLINK_CB(skb).dst_group = group;
if (echo)
atomic_inc(&skb->users);
netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
if (echo)
err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
return err;
}
int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
{
struct sock *rtnl = net->rtnl;
return nlmsg_unicast(rtnl, skb, pid);
}
EXPORT_SYMBOL(rtnl_unicast);
void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
struct nlmsghdr *nlh, gfp_t flags)
{
struct sock *rtnl = net->rtnl;
int report = 0;
if (nlh)
report = nlmsg_report(nlh);
nlmsg_notify(rtnl, skb, pid, group, report, flags);
}
EXPORT_SYMBOL(rtnl_notify);
void rtnl_set_sk_err(struct net *net, u32 group, int error)
{
struct sock *rtnl = net->rtnl;
netlink_set_err(rtnl, 0, group, error);
}
EXPORT_SYMBOL(rtnl_set_sk_err);
int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
{
struct nlattr *mx;
int i, valid = 0;
mx = nla_nest_start(skb, RTA_METRICS);
if (mx == NULL)
return -ENOBUFS;
for (i = 0; i < RTAX_MAX; i++) {
if (metrics[i]) {
valid++;
NLA_PUT_U32(skb, i+1, metrics[i]);
}
}
if (!valid) {
nla_nest_cancel(skb, mx);
return 0;
}
return nla_nest_end(skb, mx);
nla_put_failure:
nla_nest_cancel(skb, mx);
return -EMSGSIZE;
}
EXPORT_SYMBOL(rtnetlink_put_metrics);
int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
u32 ts, u32 tsage, long expires, u32 error)
{
struct rta_cacheinfo ci = {
.rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
.rta_used = dst->__use,
.rta_clntref = atomic_read(&(dst->__refcnt)),
.rta_error = error,
.rta_id = id,
.rta_ts = ts,
.rta_tsage = tsage,
};
if (expires)
ci.rta_expires = jiffies_to_clock_t(expires);
return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
}
EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
static void set_operstate(struct net_device *dev, unsigned char transition)
{
unsigned char operstate = dev->operstate;
switch (transition) {
case IF_OPER_UP:
if ((operstate == IF_OPER_DORMANT ||
operstate == IF_OPER_UNKNOWN) &&
!netif_dormant(dev))
operstate = IF_OPER_UP;
break;
case IF_OPER_DORMANT:
if (operstate == IF_OPER_UP ||
operstate == IF_OPER_UNKNOWN)
operstate = IF_OPER_DORMANT;
break;
}
if (dev->operstate != operstate) {
write_lock_bh(&dev_base_lock);
dev->operstate = operstate;
write_unlock_bh(&dev_base_lock);
netdev_state_change(dev);
}
}
static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
const struct ifinfomsg *ifm)
{
unsigned int flags = ifm->ifi_flags;
/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
if (ifm->ifi_change)
flags = (flags & ifm->ifi_change) |
(dev->flags & ~ifm->ifi_change);
return flags;
}
static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
const struct rtnl_link_stats64 *b)
{
a->rx_packets = b->rx_packets;
a->tx_packets = b->tx_packets;
a->rx_bytes = b->rx_bytes;
a->tx_bytes = b->tx_bytes;
a->rx_errors = b->rx_errors;
a->tx_errors = b->tx_errors;
a->rx_dropped = b->rx_dropped;
a->tx_dropped = b->tx_dropped;
a->multicast = b->multicast;
a->collisions = b->collisions;
a->rx_length_errors = b->rx_length_errors;
a->rx_over_errors = b->rx_over_errors;
a->rx_crc_errors = b->rx_crc_errors;
a->rx_frame_errors = b->rx_frame_errors;
a->rx_fifo_errors = b->rx_fifo_errors;
a->rx_missed_errors = b->rx_missed_errors;
a->tx_aborted_errors = b->tx_aborted_errors;
a->tx_carrier_errors = b->tx_carrier_errors;
a->tx_fifo_errors = b->tx_fifo_errors;
a->tx_heartbeat_errors = b->tx_heartbeat_errors;
a->tx_window_errors = b->tx_window_errors;
a->rx_compressed = b->rx_compressed;
a->tx_compressed = b->tx_compressed;
}
static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
{
memcpy(v, b, sizeof(*b));
}
/* All VF info */
static inline int rtnl_vfinfo_size(const struct net_device *dev)
{
if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
int num_vfs = dev_num_vf(dev->dev.parent);
size_t size = nla_total_size(sizeof(struct nlattr));
size += nla_total_size(num_vfs * sizeof(struct nlattr));
size += num_vfs *
(nla_total_size(sizeof(struct ifla_vf_mac)) +
nla_total_size(sizeof(struct ifla_vf_vlan)) +
nla_total_size(sizeof(struct ifla_vf_tx_rate)));
return size;
} else
return 0;
}
static size_t rtnl_port_size(const struct net_device *dev)
{
size_t port_size = nla_total_size(4) /* PORT_VF */
+ nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
+ nla_total_size(sizeof(struct ifla_port_vsi))
/* PORT_VSI_TYPE */
+ nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
+ nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
+ nla_total_size(1) /* PROT_VDP_REQUEST */
+ nla_total_size(2); /* PORT_VDP_RESPONSE */
size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
+ port_size;
size_t port_self_size = nla_total_size(sizeof(struct nlattr))
+ port_size;
if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
return 0;
if (dev_num_vf(dev->dev.parent))
return port_self_size + vf_ports_size +
vf_port_size * dev_num_vf(dev->dev.parent);
else
return port_self_size;
}
static noinline size_t if_nlmsg_size(const struct net_device *dev)
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
+ nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
+ nla_total_size(sizeof(struct rtnl_link_ifmap))
+ nla_total_size(sizeof(struct rtnl_link_stats))
+ nla_total_size(sizeof(struct rtnl_link_stats64))
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
+ nla_total_size(4) /* IFLA_TXQLEN */
+ nla_total_size(4) /* IFLA_WEIGHT */
+ nla_total_size(4) /* IFLA_MTU */
+ nla_total_size(4) /* IFLA_LINK */
+ nla_total_size(4) /* IFLA_MASTER */
+ nla_total_size(1) /* IFLA_OPERSTATE */
+ nla_total_size(1) /* IFLA_LINKMODE */
+ nla_total_size(4) /* IFLA_NUM_VF */
+ rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
+ rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
+ rtnl_link_get_size(dev) /* IFLA_LINKINFO */
+ rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
}
static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
{
struct nlattr *vf_ports;
struct nlattr *vf_port;
int vf;
int err;
vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
if (!vf_ports)
return -EMSGSIZE;
for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
vf_port = nla_nest_start(skb, IFLA_VF_PORT);
if (!vf_port)
goto nla_put_failure;
NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
if (err == -EMSGSIZE)
goto nla_put_failure;
if (err) {
nla_nest_cancel(skb, vf_port);
continue;
}
nla_nest_end(skb, vf_port);
}
nla_nest_end(skb, vf_ports);
return 0;
nla_put_failure:
nla_nest_cancel(skb, vf_ports);
return -EMSGSIZE;
}
static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
{
struct nlattr *port_self;
int err;
port_self = nla_nest_start(skb, IFLA_PORT_SELF);
if (!port_self)
return -EMSGSIZE;
err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
if (err) {
nla_nest_cancel(skb, port_self);
return (err == -EMSGSIZE) ? err : 0;
}
nla_nest_end(skb, port_self);
return 0;
}
static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
{
int err;
if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
return 0;
err = rtnl_port_self_fill(skb, dev);
if (err)
return err;
if (dev_num_vf(dev->dev.parent)) {
err = rtnl_vf_ports_fill(skb, dev);
if (err)
return err;
}
return 0;
}
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
int type, u32 pid, u32 seq, u32 change,
unsigned int flags)
{
struct ifinfomsg *ifm;
struct nlmsghdr *nlh;
struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats;
struct nlattr *attr, *af_spec;
struct rtnl_af_ops *af_ops;
ASSERT_RTNL();
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
if (nlh == NULL)
return -EMSGSIZE;
ifm = nlmsg_data(nlh);
ifm->ifi_family = AF_UNSPEC;
ifm->__ifi_pad = 0;
ifm->ifi_type = dev->type;
ifm->ifi_index = dev->ifindex;
ifm->ifi_flags = dev_get_flags(dev);
ifm->ifi_change = change;
NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
NLA_PUT_U8(skb, IFLA_OPERSTATE,
netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
if (dev->ifindex != dev->iflink)
NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
if (dev->master)
NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
if (dev->qdisc)
NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
if (dev->ifalias)
NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
if (1) {
struct rtnl_link_ifmap map = {
.mem_start = dev->mem_start,
.mem_end = dev->mem_end,
.base_addr = dev->base_addr,
.irq = dev->irq,
.dma = dev->dma,
.port = dev->if_port,
};
NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
}
if (dev->addr_len) {
NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
}
attr = nla_reserve(skb, IFLA_STATS,
sizeof(struct rtnl_link_stats));
if (attr == NULL)
goto nla_put_failure;
stats = dev_get_stats(dev, &temp);
copy_rtnl_link_stats(nla_data(attr), stats);
attr = nla_reserve(skb, IFLA_STATS64,
sizeof(struct rtnl_link_stats64));
if (attr == NULL)
goto nla_put_failure;
copy_rtnl_link_stats64(nla_data(attr), stats);
if (dev->dev.parent)
NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
int i;
struct nlattr *vfinfo, *vf;
int num_vfs = dev_num_vf(dev->dev.parent);
vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
if (!vfinfo)
goto nla_put_failure;
for (i = 0; i < num_vfs; i++) {
struct ifla_vf_info ivi;
struct ifla_vf_mac vf_mac;
struct ifla_vf_vlan vf_vlan;
struct ifla_vf_tx_rate vf_tx_rate;
if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
break;
vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
vf_vlan.vlan = ivi.vlan;
vf_vlan.qos = ivi.qos;
vf_tx_rate.rate = ivi.tx_rate;
vf = nla_nest_start(skb, IFLA_VF_INFO);
if (!vf) {
nla_nest_cancel(skb, vfinfo);
goto nla_put_failure;
}
NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
nla_nest_end(skb, vf);
}
nla_nest_end(skb, vfinfo);
}
if (rtnl_port_fill(skb, dev))
goto nla_put_failure;
if (dev->rtnl_link_ops) {
if (rtnl_link_fill(skb, dev) < 0)
goto nla_put_failure;
}
if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
goto nla_put_failure;
list_for_each_entry(af_ops, &rtnl_af_ops, list) {
if (af_ops->fill_link_af) {
struct nlattr *af;
int err;
if (!(af = nla_nest_start(skb, af_ops->family)))
goto nla_put_failure;
err = af_ops->fill_link_af(skb, dev);
/*
* Caller may return ENODATA to indicate that there
* was no data to be dumped. This is not an error, it
* means we should trim the attribute header and
* continue.
*/
if (err == -ENODATA)
nla_nest_cancel(skb, af);
else if (err < 0)
goto nla_put_failure;
nla_nest_end(skb, af);
}
}
nla_nest_end(skb, af_spec);
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
int h, s_h;
int idx = 0, s_idx;
struct net_device *dev;
struct hlist_head *head;
struct hlist_node *node;
s_h = cb->args[0];
s_idx = cb->args[1];
rcu_read_lock();
cb->seq = net->dev_base_seq;
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &net->dev_index_head[h];
hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
if (idx < s_idx)
goto cont;
if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, 0,
NLM_F_MULTI) <= 0)
goto out;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
}
out:
rcu_read_unlock();
cb->args[1] = idx;
cb->args[0] = h;
return skb->len;
}
const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
[IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
[IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
[IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
[IFLA_MTU] = { .type = NLA_U32 },
[IFLA_LINK] = { .type = NLA_U32 },
[IFLA_MASTER] = { .type = NLA_U32 },
[IFLA_TXQLEN] = { .type = NLA_U32 },
[IFLA_WEIGHT] = { .type = NLA_U32 },
[IFLA_OPERSTATE] = { .type = NLA_U8 },
[IFLA_LINKMODE] = { .type = NLA_U8 },
[IFLA_LINKINFO] = { .type = NLA_NESTED },
[IFLA_NET_NS_PID] = { .type = NLA_U32 },
[IFLA_NET_NS_FD] = { .type = NLA_U32 },
[IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
[IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
[IFLA_VF_PORTS] = { .type = NLA_NESTED },
[IFLA_PORT_SELF] = { .type = NLA_NESTED },
[IFLA_AF_SPEC] = { .type = NLA_NESTED },
};
EXPORT_SYMBOL(ifla_policy);
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
[IFLA_INFO_KIND] = { .type = NLA_STRING },
[IFLA_INFO_DATA] = { .type = NLA_NESTED },
};
static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
[IFLA_VF_INFO] = { .type = NLA_NESTED },
};
static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
[IFLA_VF_MAC] = { .type = NLA_BINARY,
.len = sizeof(struct ifla_vf_mac) },
[IFLA_VF_VLAN] = { .type = NLA_BINARY,
.len = sizeof(struct ifla_vf_vlan) },
[IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
.len = sizeof(struct ifla_vf_tx_rate) },
};
static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
[IFLA_PORT_VF] = { .type = NLA_U32 },
[IFLA_PORT_PROFILE] = { .type = NLA_STRING,
.len = PORT_PROFILE_MAX },
[IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
.len = sizeof(struct ifla_port_vsi)},
[IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
.len = PORT_UUID_MAX },
[IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
.len = PORT_UUID_MAX },
[IFLA_PORT_REQUEST] = { .type = NLA_U8, },
[IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
};
struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
{
struct net *net;
/* Examine the link attributes and figure out which
* network namespace we are talking about.
*/
if (tb[IFLA_NET_NS_PID])
net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
else if (tb[IFLA_NET_NS_FD])
net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
else
net = get_net(src_net);
return net;
}
EXPORT_SYMBOL(rtnl_link_get_net);
static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
{
if (dev) {
if (tb[IFLA_ADDRESS] &&
nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
return -EINVAL;
if (tb[IFLA_BROADCAST] &&
nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
return -EINVAL;
}
if (tb[IFLA_AF_SPEC]) {
struct nlattr *af;
int rem, err;
nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
const struct rtnl_af_ops *af_ops;
if (!(af_ops = rtnl_af_lookup(nla_type(af))))
return -EAFNOSUPPORT;
if (!af_ops->set_link_af)
return -EOPNOTSUPP;
if (af_ops->validate_link_af) {
err = af_ops->validate_link_af(dev, af);
if (err < 0)
return err;
}
}
}
return 0;
}
static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
{
int rem, err = -EINVAL;
struct nlattr *vf;
const struct net_device_ops *ops = dev->netdev_ops;
nla_for_each_nested(vf, attr, rem) {
switch (nla_type(vf)) {
case IFLA_VF_MAC: {
struct ifla_vf_mac *ivm;
ivm = nla_data(vf);
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_mac)
err = ops->ndo_set_vf_mac(dev, ivm->vf,
ivm->mac);
break;
}
case IFLA_VF_VLAN: {
struct ifla_vf_vlan *ivv;
ivv = nla_data(vf);
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_vlan)
err = ops->ndo_set_vf_vlan(dev, ivv->vf,
ivv->vlan,
ivv->qos);
break;
}
case IFLA_VF_TX_RATE: {
struct ifla_vf_tx_rate *ivt;
ivt = nla_data(vf);
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_tx_rate)
err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
ivt->rate);
break;
}
default:
err = -EINVAL;
break;
}
if (err)
break;
}
return err;
}
static int do_set_master(struct net_device *dev, int ifindex)
{
struct net_device *master_dev;
const struct net_device_ops *ops;
int err;
if (dev->master) {
if (dev->master->ifindex == ifindex)
return 0;
ops = dev->master->netdev_ops;
if (ops->ndo_del_slave) {
err = ops->ndo_del_slave(dev->master, dev);
if (err)
return err;
} else {
return -EOPNOTSUPP;
}
}
if (ifindex) {
master_dev = __dev_get_by_index(dev_net(dev), ifindex);
if (!master_dev)
return -EINVAL;
ops = master_dev->netdev_ops;
if (ops->ndo_add_slave) {
err = ops->ndo_add_slave(master_dev, dev);
if (err)
return err;
} else {
return -EOPNOTSUPP;
}
}
return 0;
}
static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
struct nlattr **tb, char *ifname, int modified)
{
const struct net_device_ops *ops = dev->netdev_ops;
int send_addr_notify = 0;
int err;
if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
struct net *net = rtnl_link_get_net(dev_net(dev), tb);
if (IS_ERR(net)) {
err = PTR_ERR(net);
goto errout;
}
err = dev_change_net_namespace(dev, net, ifname);
put_net(net);
if (err)
goto errout;
modified = 1;
}
if (tb[IFLA_MAP]) {
struct rtnl_link_ifmap *u_map;
struct ifmap k_map;
if (!ops->ndo_set_config) {
err = -EOPNOTSUPP;
goto errout;
}
if (!netif_device_present(dev)) {
err = -ENODEV;
goto errout;
}
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 = ops->ndo_set_config(dev, &k_map);
if (err < 0)
goto errout;
modified = 1;
}
if (tb[IFLA_ADDRESS]) {
struct sockaddr *sa;
int len;
if (!ops->ndo_set_mac_address) {
err = -EOPNOTSUPP;
goto errout;
}
if (!netif_device_present(dev)) {
err = -ENODEV;
goto errout;
}
len = sizeof(sa_family_t) + dev->addr_len;
sa = kmalloc(len, GFP_KERNEL);
if (!sa) {
err = -ENOMEM;
goto errout;
}
sa->sa_family = dev->type;
memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
dev->addr_len);
err = ops->ndo_set_mac_address(dev, sa);
kfree(sa);
if (err)
goto errout;
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;
modified = 1;
}
if (tb[IFLA_GROUP]) {
dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
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;
modified = 1;
}
if (tb[IFLA_IFALIAS]) {
err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
nla_len(tb[IFLA_IFALIAS]));
if (err < 0)
goto errout;
modified = 1;
}
if (tb[IFLA_BROADCAST]) {
nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
send_addr_notify = 1;
}
if (ifm->ifi_flags || ifm->ifi_change) {
err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
if (err < 0)
goto errout;
}
if (tb[IFLA_MASTER]) {
err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
if (err)
goto errout;
modified = 1;
}
if (tb[IFLA_TXQLEN])
dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
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);
}
if (tb[IFLA_VFINFO_LIST]) {
struct nlattr *attr;
int rem;
nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
if (nla_type(attr) != IFLA_VF_INFO) {
err = -EINVAL;
goto errout;
}
err = do_setvfinfo(dev, attr);
if (err < 0)
goto errout;
modified = 1;
}
}
err = 0;
if (tb[IFLA_VF_PORTS]) {
struct nlattr *port[IFLA_PORT_MAX+1];
struct nlattr *attr;
int vf;
int rem;
err = -EOPNOTSUPP;
if (!ops->ndo_set_vf_port)
goto errout;
nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
if (nla_type(attr) != IFLA_VF_PORT)
continue;
err = nla_parse_nested(port, IFLA_PORT_MAX,
attr, ifla_port_policy);
if (err < 0)
goto errout;
if (!port[IFLA_PORT_VF]) {
err = -EOPNOTSUPP;
goto errout;
}
vf = nla_get_u32(port[IFLA_PORT_VF]);
err = ops->ndo_set_vf_port(dev, vf, port);
if (err < 0)
goto errout;
modified = 1;
}
}
err = 0;
if (tb[IFLA_PORT_SELF]) {
struct nlattr *port[IFLA_PORT_MAX+1];
err = nla_parse_nested(port, IFLA_PORT_MAX,
tb[IFLA_PORT_SELF], ifla_port_policy);
if (err < 0)
goto errout;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_port)
err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
if (err < 0)
goto errout;
modified = 1;
}
if (tb[IFLA_AF_SPEC]) {
struct nlattr *af;
int rem;
nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
const struct rtnl_af_ops *af_ops;
if (!(af_ops = rtnl_af_lookup(nla_type(af))))
BUG();
err = af_ops->set_link_af(dev, af);
if (err < 0)
goto errout;
modified = 1;
}
}
err = 0;
errout:
if (err < 0 && modified && net_ratelimit())
printk(KERN_WARNING "A link change request failed with "
"some changes committed 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);
return err;
}
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
struct net_device *dev;
int err;
struct nlattr *tb[IFLA_MAX+1];
char ifname[IFNAMSIZ];
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
goto errout;
if (tb[IFLA_IFNAME])
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
else
ifname[0] = '\0';
err = -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = __dev_get_by_name(net, ifname);
else
goto errout;
if (dev == NULL) {
err = -ENODEV;
goto errout;
}
err = validate_linkmsg(dev, tb);
if (err < 0)
goto errout;
err = do_setlink(dev, ifm, tb, ifname, 0);
errout:
return err;
}
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
const struct rtnl_link_ops *ops;
struct net_device *dev;
struct ifinfomsg *ifm;
char ifname[IFNAMSIZ];
struct nlattr *tb[IFLA_MAX+1];
int err;
LIST_HEAD(list_kill);
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
return err;
if (tb[IFLA_IFNAME])
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = __dev_get_by_name(net, ifname);
else
return -EINVAL;
if (!dev)
return -ENODEV;
ops = dev->rtnl_link_ops;
if (!ops)
return -EOPNOTSUPP;
ops->dellink(dev, &list_kill);
unregister_netdevice_many(&list_kill);
list_del(&list_kill);
return 0;
}
int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
{
unsigned int old_flags;
int err;
old_flags = dev->flags;
if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
if (err < 0)
return err;
}
dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
__dev_notify_flags(dev, old_flags);
return 0;
}
EXPORT_SYMBOL(rtnl_configure_link);
struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
{
int err;
struct net_device *dev;
unsigned int num_queues = 1;
unsigned int real_num_queues = 1;
if (ops->get_tx_queues) {
err = ops->get_tx_queues(src_net, tb, &num_queues,
&real_num_queues);
if (err)
goto err;
}
err = -ENOMEM;
dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
if (!dev)
goto err;
dev_net_set(dev, net);
dev->rtnl_link_ops = ops;
dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
dev->real_num_tx_queues = real_num_queues;
if (tb[IFLA_MTU])
dev->mtu = nla_get_u32(tb[IFLA_MTU]);
if (tb[IFLA_ADDRESS])
memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
nla_len(tb[IFLA_ADDRESS]));
if (tb[IFLA_BROADCAST])
memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
nla_len(tb[IFLA_BROADCAST]));
if (tb[IFLA_TXQLEN])
dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
if (tb[IFLA_OPERSTATE])
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
if (tb[IFLA_LINKMODE])
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
if (tb[IFLA_GROUP])
dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
return dev;
err:
return ERR_PTR(err);
}
EXPORT_SYMBOL(rtnl_create_link);
static int rtnl_group_changelink(struct net *net, int group,
struct ifinfomsg *ifm,
struct nlattr **tb)
{
struct net_device *dev;
int err;
for_each_netdev(net, dev) {
if (dev->group == group) {
err = do_setlink(dev, ifm, tb, NULL, 0);
if (err < 0)
return err;
}
}
return 0;
}
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
const struct rtnl_link_ops *ops;
struct net_device *dev;
struct ifinfomsg *ifm;
char kind[MODULE_NAME_LEN];
char ifname[IFNAMSIZ];
struct nlattr *tb[IFLA_MAX+1];
struct nlattr *linkinfo[IFLA_INFO_MAX+1];
int err;
#ifdef CONFIG_MODULES
replay:
#endif
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
return err;
if (tb[IFLA_IFNAME])
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
else
ifname[0] = '\0';
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else {
if (ifname[0])
dev = __dev_get_by_name(net, ifname);
else
dev = NULL;
}
err = validate_linkmsg(dev, tb);
if (err < 0)
return err;
if (tb[IFLA_LINKINFO]) {
err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
tb[IFLA_LINKINFO], ifla_info_policy);
if (err < 0)
return err;
} else
memset(linkinfo, 0, sizeof(linkinfo));
if (linkinfo[IFLA_INFO_KIND]) {
nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
ops = rtnl_link_ops_get(kind);
} else {
kind[0] = '\0';
ops = NULL;
}
if (1) {
struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
struct net *dest_net;
if (ops) {
if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
err = nla_parse_nested(attr, ops->maxtype,
linkinfo[IFLA_INFO_DATA],
ops->policy);
if (err < 0)
return err;
data = attr;
}
if (ops->validate) {
err = ops->validate(tb, data);
if (err < 0)
return err;
}
}
if (dev) {
int modified = 0;
if (nlh->nlmsg_flags & NLM_F_EXCL)
return -EEXIST;
if (nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;
if (linkinfo[IFLA_INFO_DATA]) {
if (!ops || ops != dev->rtnl_link_ops ||
!ops->changelink)
return -EOPNOTSUPP;
err = ops->changelink(dev, tb, data);
if (err < 0)
return err;
modified = 1;
}
return do_setlink(dev, ifm, tb, ifname, modified);
}
if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
return rtnl_group_changelink(net,
nla_get_u32(tb[IFLA_GROUP]),
ifm, tb);
return -ENODEV;
}
if (ifm->ifi_index)
return -EOPNOTSUPP;
if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
return -EOPNOTSUPP;
if (!ops) {
#ifdef CONFIG_MODULES
if (kind[0]) {
__rtnl_unlock();
request_module("rtnl-link-%s", kind);
rtnl_lock();
ops = rtnl_link_ops_get(kind);
if (ops)
goto replay;
}
#endif
return -EOPNOTSUPP;
}
if (!ifname[0])
snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
dest_net = rtnl_link_get_net(net, tb);
if (IS_ERR(dest_net))
return PTR_ERR(dest_net);
dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
if (IS_ERR(dev))
err = PTR_ERR(dev);
else if (ops->newlink)
err = ops->newlink(net, dev, tb, data);
else
err = register_netdevice(dev);
if (err < 0 && !IS_ERR(dev))
free_netdev(dev);
if (err < 0)
goto out;
err = rtnl_configure_link(dev, ifm);
if (err < 0)
unregister_netdevice(dev);
out:
put_net(dest_net);
return err;
}
}
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
char ifname[IFNAMSIZ];
struct nlattr *tb[IFLA_MAX+1];
struct net_device *dev = NULL;
struct sk_buff *nskb;
int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
return err;
if (tb[IFLA_IFNAME])
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME])
dev = __dev_get_by_name(net, ifname);
else
return -EINVAL;
if (dev == NULL)
return -ENODEV;
nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
if (nskb == NULL)
return -ENOBUFS;
err = rtnl_fill_ifinfo(nskb, dev, 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);
} else
err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
return err;
}
static u16 rtnl_calcit(struct sk_buff *skb)
{
return min_ifinfo_dump_size;
}
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 <= RTNL_FAMILY_MAX; idx++) {
int type = cb->nlh->nlmsg_type-RTM_BASE;
if (idx < s_idx || idx == PF_PACKET)
continue;
if (rtnl_msg_handlers[idx] == NULL ||
rtnl_msg_handlers[idx][type].dumpit == NULL)
continue;
if (idx > s_idx)
memset(&cb->args[0], 0, sizeof(cb->args));
if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
break;
}
cb->family = idx;
return skb->len;
}
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
struct net *net = dev_net(dev);
struct sk_buff *skb;
int err = -ENOBUFS;
size_t if_info_size;
skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL);
if (skb == NULL)
goto errout;
min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size);
err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
}
/* Protected by RTNL sempahore. */
static struct rtattr **rta_buf;
static int rtattr_max;
/* Process one rtnetlink message. */
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
rtnl_doit_func doit;
int sz_idx, kind;
int min_len;
int family;
int type;
int err;
type = nlh->nlmsg_type;
if (type > RTM_MAX)
return -EOPNOTSUPP;
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;
sz_idx = type>>2;
kind = type&3;
if (kind != 2 && !capable(CAP_NET_ADMIN))
return -EPERM;
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
struct sock *rtnl;
rtnl_dumpit_func dumpit;
rtnl_calcit_func calcit;
u16 min_dump_alloc = 0;
dumpit = rtnl_get_dumpit(family, type);
if (dumpit == NULL)
return -EOPNOTSUPP;
calcit = rtnl_get_calcit(family, type);
if (calcit)
min_dump_alloc = calcit(skb);
__rtnl_unlock();
rtnl = net->rtnl;
err = netlink_dump_start(rtnl, skb, nlh, dumpit,
NULL, min_dump_alloc);
rtnl_lock();
return err;
}
memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
min_len = rtm_min[sz_idx];
if (nlh->nlmsg_len < min_len)
return -EINVAL;
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])
return -EINVAL;
rta_buf[flavor-1] = attr;
}
attr = RTA_NEXT(attr, attrlen);
}
}
doit = rtnl_get_doit(family, type);
if (doit == NULL)
return -EOPNOTSUPP;
return doit(skb, nlh, (void *)&rta_buf[0]);
}
static void rtnetlink_rcv(struct sk_buff *skb)
{
rtnl_lock();
netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
rtnl_unlock();
}
static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
switch (event) {
case NETDEV_UP:
case NETDEV_DOWN:
case NETDEV_PRE_UP:
case NETDEV_POST_INIT:
case NETDEV_REGISTER:
case NETDEV_CHANGE:
case NETDEV_PRE_TYPE_CHANGE:
case NETDEV_GOING_DOWN:
case NETDEV_UNREGISTER:
case NETDEV_UNREGISTER_BATCH:
case NETDEV_RELEASE:
case NETDEV_JOIN:
break;
default:
rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block rtnetlink_dev_notifier = {
.notifier_call = rtnetlink_event,
};
static int __net_init rtnetlink_net_init(struct net *net)
{
struct sock *sk;
sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
if (!sk)
return -ENOMEM;
net->rtnl = sk;
return 0;
}
static void __net_exit rtnetlink_net_exit(struct net *net)
{
netlink_kernel_release(net->rtnl);
net->rtnl = NULL;
}
static struct pernet_operations rtnetlink_net_ops = {
.init = rtnetlink_net_init,
.exit = rtnetlink_net_exit,
};
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");
if (register_pernet_subsys(&rtnetlink_net_ops))
panic("rtnetlink_init: cannot initialize rtnetlink\n");
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
register_netdevice_notifier(&rtnetlink_dev_notifier);
rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
rtnl_dump_ifinfo, rtnl_calcit);
rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
}