korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 21:38:32 +08:00
Code Issues Packages Projects Releases Wiki Activity
9f3ef3d702
linux/net/core/rtnetlink.c
Michal Kubecek f74877a545 rtnetlink: provide permanent hardware address in RTM_NEWLINK 
Permanent hardware address of a network device was traditionally provided
via ethtool ioctl interface but as Jiri Pirko pointed out in a review of
ethtool netlink interface, rtnetlink is much more suitable for it so let's
add it to the RTM_NEWLINK message.

Add IFLA_PERM_ADDRESS attribute to RTM_NEWLINK messages unless the
permanent address is all zeros (i.e. device driver did not fill it). As
permanent address is not modifiable, reject userspace requests containing
IFLA_PERM_ADDRESS attribute.

Note: we already provide permanent hardware address for bond slaves;
unfortunately we cannot drop that attribute for backward compatibility
reasons.

v5 -> v6: only add the attribute if permanent address is not zero

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-12-12 17:07:05 -08:00

5554 lines
133 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*
* Fixes:
* Vitaly E. Lavrov RTA_OK arithmetics was wrong.
*/
#include <linux/bitops.h>
#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/if_bridge.h>
#include <linux/if_vlan.h>
#include <linux/pci.h>
#include <linux/etherdevice.h>
#include <linux/bpf.h>
#include <linux/uaccess.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/tcp.h>
#include <net/sock.h>
#include <net/pkt_sched.h>
#include <net/fib_rules.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#define RTNL_MAX_TYPE 50
#define RTNL_SLAVE_MAX_TYPE 36
struct rtnl_link {
rtnl_doit_func doit;
rtnl_dumpit_func dumpit;
struct module *owner;
unsigned int flags;
struct rcu_head rcu;
};
static DEFINE_MUTEX(rtnl_mutex);
void rtnl_lock(void)
{
mutex_lock(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_lock);
int rtnl_lock_killable(void)
{
return mutex_lock_killable(&rtnl_mutex);
}
EXPORT_SYMBOL(rtnl_lock_killable);
static struct sk_buff *defer_kfree_skb_list;
void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
{
if (head && tail) {
tail->next = defer_kfree_skb_list;
defer_kfree_skb_list = head;
}
}
EXPORT_SYMBOL(rtnl_kfree_skbs);
void __rtnl_unlock(void)
{
struct sk_buff *head = defer_kfree_skb_list;
defer_kfree_skb_list = NULL;
mutex_unlock(&rtnl_mutex);
while (head) {
struct sk_buff *next = head->next;
kfree_skb(head);
cond_resched();
head = next;
}
}
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);
bool refcount_dec_and_rtnl_lock(refcount_t *r)
{
return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
}
EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
#ifdef CONFIG_PROVE_LOCKING
bool 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 *__rcu *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 struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
{
struct rtnl_link **tab;
if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
protocol = PF_UNSPEC;
tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
if (!tab)
tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
return tab[msgtype];
}
static int rtnl_register_internal(struct module *owner,
int protocol, int msgtype,
rtnl_doit_func doit, rtnl_dumpit_func dumpit,
unsigned int flags)
{
struct rtnl_link *link, *old;
struct rtnl_link __rcu **tab;
int msgindex;
int ret = -ENOBUFS;
BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
msgindex = rtm_msgindex(msgtype);
rtnl_lock();
tab = rtnl_msg_handlers[protocol];
if (tab == NULL) {
tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
if (!tab)
goto unlock;
/* ensures we see the 0 stores */
rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
}
old = rtnl_dereference(tab[msgindex]);
if (old) {
link = kmemdup(old, sizeof(*old), GFP_KERNEL);
if (!link)
goto unlock;
} else {
link = kzalloc(sizeof(*link), GFP_KERNEL);
if (!link)
goto unlock;
}
WARN_ON(link->owner && link->owner != owner);
link->owner = owner;
WARN_ON(doit && link->doit && link->doit != doit);
if (doit)
link->doit = doit;
WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
if (dumpit)
link->dumpit = dumpit;
link->flags |= flags;
/* publish protocol:msgtype */
rcu_assign_pointer(tab[msgindex], link);
ret = 0;
if (old)
kfree_rcu(old, rcu);
unlock:
rtnl_unlock();
return ret;
}
/**
* rtnl_register_module - Register a rtnetlink message type
*
* @owner: module registering the hook (THIS_MODULE)
* @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
* @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
*
* Like rtnl_register, but for use by removable modules.
*/
int rtnl_register_module(struct module *owner,
int protocol, int msgtype,
rtnl_doit_func doit, rtnl_dumpit_func dumpit,
unsigned int flags)
{
return rtnl_register_internal(owner, protocol, msgtype,
doit, dumpit, flags);
}
EXPORT_SYMBOL_GPL(rtnl_register_module);
/**
* 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
* @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
*
* 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.
*/
void rtnl_register(int protocol, int msgtype,
rtnl_doit_func doit, rtnl_dumpit_func dumpit,
unsigned int flags)
{
int err;
err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
flags);
if (err)
pr_err("Unable to register rtnetlink message handler, "
"protocol = %d, message type = %d\n", protocol, msgtype);
}
/**
* 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)
{
struct rtnl_link **tab, *link;
int msgindex;
BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
msgindex = rtm_msgindex(msgtype);
rtnl_lock();
tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
if (!tab) {
rtnl_unlock();
return -ENOENT;
}
link = tab[msgindex];
rcu_assign_pointer(tab[msgindex], NULL);
rtnl_unlock();
kfree_rcu(link, rcu);
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)
{
struct rtnl_link **tab, *link;
int msgindex;
BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
rtnl_lock();
tab = rtnl_msg_handlers[protocol];
if (!tab) {
rtnl_unlock();
return;
}
RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
link = tab[msgindex];
if (!link)
continue;
rcu_assign_pointer(tab[msgindex], NULL);
kfree_rcu(link, rcu);
}
rtnl_unlock();
synchronize_net();
kfree(tab);
}
EXPORT_SYMBOL_GPL(rtnl_unregister_all);
static LIST_HEAD(link_ops);
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;
}
/**
* __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 (rtnl_link_ops_get(ops->kind))
return -EEXIST;
/* The check for setup is here because if ops
* does not have that filled up, it is not possible
* to use the ops for creating device. So do not
* fill up dellink as well. That disables rtnl_dellink.
*/
if (ops->setup && !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;
/* Sanity-check max sizes to avoid stack buffer overflow. */
if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
return -EINVAL;
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 and guarantee net_namespace_list
* integrity (hold pernet_ops_rwsem for writing to close the race
* with setup_net() and cleanup_net()).
*/
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);
/* Return with the rtnl_lock held when there are no network
* devices unregistering in any network namespace.
*/
static void rtnl_lock_unregistering_all(void)
{
struct net *net;
bool unregistering;
DEFINE_WAIT_FUNC(wait, woken_wake_function);
add_wait_queue(&netdev_unregistering_wq, &wait);
for (;;) {
unregistering = false;
rtnl_lock();
/* We held write locked pernet_ops_rwsem, and parallel
* setup_net() and cleanup_net() are not possible.
*/
for_each_net(net) {
if (net->dev_unreg_count > 0) {
unregistering = true;
break;
}
}
if (!unregistering)
break;
__rtnl_unlock();
wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
}
remove_wait_queue(&netdev_unregistering_wq, &wait);
}
/**
* 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)
{
/* Close the race with setup_net() and cleanup_net() */
down_write(&pernet_ops_rwsem);
rtnl_lock_unregistering_all();
__rtnl_link_unregister(ops);
rtnl_unlock();
up_write(&pernet_ops_rwsem);
}
EXPORT_SYMBOL_GPL(rtnl_link_unregister);
static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
{
struct net_device *master_dev;
const struct rtnl_link_ops *ops;
size_t size = 0;
rcu_read_lock();
master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
if (!master_dev)
goto out;
ops = master_dev->rtnl_link_ops;
if (!ops || !ops->get_slave_size)
goto out;
/* IFLA_INFO_SLAVE_DATA + nested data */
size = nla_total_size(sizeof(struct nlattr)) +
ops->get_slave_size(master_dev, dev);
out:
rcu_read_unlock();
return size;
}
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));
size += rtnl_link_get_slave_info_data_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_rcu(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
*
* Returns 0 on success or a negative error code.
*/
void rtnl_af_register(struct rtnl_af_ops *ops)
{
rtnl_lock();
list_add_tail_rcu(&ops->list, &rtnl_af_ops);
rtnl_unlock();
}
EXPORT_SYMBOL_GPL(rtnl_af_register);
/**
* 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();
list_del_rcu(&ops->list);
rtnl_unlock();
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(rtnl_af_unregister);
static size_t rtnl_link_get_af_size(const struct net_device *dev,
u32 ext_filter_mask)
{
struct rtnl_af_ops *af_ops;
size_t size;
/* IFLA_AF_SPEC */
size = nla_total_size(sizeof(struct nlattr));
rcu_read_lock();
list_for_each_entry_rcu(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, ext_filter_mask);
}
}
rcu_read_unlock();
return size;
}
static bool rtnl_have_link_slave_info(const struct net_device *dev)
{
struct net_device *master_dev;
bool ret = false;
rcu_read_lock();
master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
if (master_dev && master_dev->rtnl_link_ops)
ret = true;
rcu_read_unlock();
return ret;
}
static int rtnl_link_slave_info_fill(struct sk_buff *skb,
const struct net_device *dev)
{
struct net_device *master_dev;
const struct rtnl_link_ops *ops;
struct nlattr *slave_data;
int err;
master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
if (!master_dev)
return 0;
ops = master_dev->rtnl_link_ops;
if (!ops)
return 0;
if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
return -EMSGSIZE;
if (ops->fill_slave_info) {
slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
if (!slave_data)
return -EMSGSIZE;
err = ops->fill_slave_info(skb, master_dev, dev);
if (err < 0)
goto err_cancel_slave_data;
nla_nest_end(skb, slave_data);
}
return 0;
err_cancel_slave_data:
nla_nest_cancel(skb, slave_data);
return err;
}
static int rtnl_link_info_fill(struct sk_buff *skb,
const struct net_device *dev)
{
const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
struct nlattr *data;
int err;
if (!ops)
return 0;
if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
return -EMSGSIZE;
if (ops->fill_xstats) {
err = ops->fill_xstats(skb, dev);
if (err < 0)
return err;
}
if (ops->fill_info) {
data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
if (data == NULL)
return -EMSGSIZE;
err = ops->fill_info(skb, dev);
if (err < 0)
goto err_cancel_data;
nla_nest_end(skb, data);
}
return 0;
err_cancel_data:
nla_nest_cancel(skb, data);
return err;
}
static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
{
struct nlattr *linkinfo;
int err = -EMSGSIZE;
linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
if (linkinfo == NULL)
goto out;
err = rtnl_link_info_fill(skb, dev);
if (err < 0)
goto err_cancel_link;
err = rtnl_link_slave_info_fill(skb, dev);
if (err < 0)
goto err_cancel_link;
nla_nest_end(skb, linkinfo);
return 0;
err_cancel_link:
nla_nest_cancel(skb, linkinfo);
out:
return err;
}
int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
{
struct sock *rtnl = net->rtnl;
int err = 0;
NETLINK_CB(skb).dst_group = group;
if (echo)
refcount_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;
/* nothing is dumped for dst_default_metrics, so just skip the loop */
if (metrics == dst_default_metrics.metrics)
return 0;
mx = nla_nest_start_noflag(skb, RTA_METRICS);
if (mx == NULL)
return -ENOBUFS;
for (i = 0; i < RTAX_MAX; i++) {
if (metrics[i]) {
if (i == RTAX_CC_ALGO - 1) {
char tmp[TCP_CA_NAME_MAX], *name;
name = tcp_ca_get_name_by_key(metrics[i], tmp);
if (!name)
continue;
if (nla_put_string(skb, i + 1, name))
goto nla_put_failure;
} else if (i == RTAX_FEATURES - 1) {
u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
if (!user_features)
continue;
BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
if (nla_put_u32(skb, i + 1, user_features))
goto nla_put_failure;
} else {
if (nla_put_u32(skb, i + 1, metrics[i]))
goto nla_put_failure;
}
valid++;
}
}
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,
long expires, u32 error)
{
struct rta_cacheinfo ci = {
.rta_error = error,
.rta_id = id,
};
if (dst) {
ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
ci.rta_used = dst->__use;
ci.rta_clntref = atomic_read(&dst->__refcnt);
}
if (expires) {
unsigned long clock;
clock = jiffies_to_clock_t(abs(expires));
clock = min_t(unsigned long, clock, INT_MAX);
ci.rta_expires = (expires > 0) ? clock : -clock;
}
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_get_flags(const struct net_device *dev)
{
return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
(dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
}
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) |
(rtnl_dev_get_flags(dev) & ~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;
a->rx_nohandler = b->rx_nohandler;
}
/* All VF info */
static inline int rtnl_vfinfo_size(const struct net_device *dev,
u32 ext_filter_mask)
{
if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
int num_vfs = dev_num_vf(dev->dev.parent);
size_t size = nla_total_size(0);
size += num_vfs *
(nla_total_size(0) +
nla_total_size(sizeof(struct ifla_vf_mac)) +
nla_total_size(sizeof(struct ifla_vf_broadcast)) +
nla_total_size(sizeof(struct ifla_vf_vlan)) +
nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
nla_total_size(MAX_VLAN_LIST_LEN *
sizeof(struct ifla_vf_vlan_info)) +
nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
nla_total_size(sizeof(struct ifla_vf_rate)) +
nla_total_size(sizeof(struct ifla_vf_link_state)) +
nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
nla_total_size(0) + /* nest IFLA_VF_STATS */
/* IFLA_VF_STATS_RX_PACKETS */
nla_total_size_64bit(sizeof(__u64)) +
/* IFLA_VF_STATS_TX_PACKETS */
nla_total_size_64bit(sizeof(__u64)) +
/* IFLA_VF_STATS_RX_BYTES */
nla_total_size_64bit(sizeof(__u64)) +
/* IFLA_VF_STATS_TX_BYTES */
nla_total_size_64bit(sizeof(__u64)) +
/* IFLA_VF_STATS_BROADCAST */
nla_total_size_64bit(sizeof(__u64)) +
/* IFLA_VF_STATS_MULTICAST */
nla_total_size_64bit(sizeof(__u64)) +
/* IFLA_VF_STATS_RX_DROPPED */
nla_total_size_64bit(sizeof(__u64)) +
/* IFLA_VF_STATS_TX_DROPPED */
nla_total_size_64bit(sizeof(__u64)) +
nla_total_size(sizeof(struct ifla_vf_trust)));
return size;
} else
return 0;
}
static size_t rtnl_port_size(const struct net_device *dev,
u32 ext_filter_mask)
{
size_t port_size = nla_total_size(4) /* PORT_VF */
+ nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
+ 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 ||
!(ext_filter_mask & RTEXT_FILTER_VF))
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 size_t rtnl_xdp_size(void)
{
size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */
nla_total_size(1) + /* XDP_ATTACHED */
nla_total_size(4) + /* XDP_PROG_ID (or 1st mode) */
nla_total_size(4); /* XDP_<mode>_PROG_ID */
return xdp_size;
}
static size_t rtnl_prop_list_size(const struct net_device *dev)
{
struct netdev_name_node *name_node;
size_t size;
if (list_empty(&dev->name_node->list))
return 0;
size = nla_total_size(0);
list_for_each_entry(name_node, &dev->name_node->list, list)
size += nla_total_size(ALTIFNAMSIZ);
return size;
}
static noinline size_t if_nlmsg_size(const struct net_device *dev,
u32 ext_filter_mask)
{
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_64bit(sizeof(struct rtnl_link_ifmap))
+ nla_total_size(sizeof(struct rtnl_link_stats))
+ nla_total_size_64bit(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_CARRIER */
+ nla_total_size(4) /* IFLA_PROMISCUITY */
+ nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
+ nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
+ nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
+ nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
+ nla_total_size(1) /* IFLA_OPERSTATE */
+ nla_total_size(1) /* IFLA_LINKMODE */
+ nla_total_size(4) /* IFLA_CARRIER_CHANGES */
+ nla_total_size(4) /* IFLA_LINK_NETNSID */
+ nla_total_size(4) /* IFLA_GROUP */
+ nla_total_size(ext_filter_mask
& RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
+ rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
+ rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
+ rtnl_link_get_size(dev) /* IFLA_LINKINFO */
+ rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
+ nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
+ nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
+ nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
+ rtnl_xdp_size() /* IFLA_XDP */
+ nla_total_size(4) /* IFLA_EVENT */
+ nla_total_size(4) /* IFLA_NEW_NETNSID */
+ nla_total_size(4) /* IFLA_NEW_IFINDEX */
+ nla_total_size(1) /* IFLA_PROTO_DOWN */
+ nla_total_size(4) /* IFLA_TARGET_NETNSID */
+ nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */
+ nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */
+ nla_total_size(4) /* IFLA_MIN_MTU */
+ nla_total_size(4) /* IFLA_MAX_MTU */
+ rtnl_prop_list_size(dev)
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
+ 0;
}
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_noflag(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_noflag(skb, IFLA_VF_PORT);
if (!vf_port)
goto nla_put_failure;
if (nla_put_u32(skb, IFLA_PORT_VF, vf))
goto nla_put_failure;
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_noflag(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,
u32 ext_filter_mask)
{
int err;
if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
!(ext_filter_mask & RTEXT_FILTER_VF))
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_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
{
int err;
struct netdev_phys_item_id ppid;
err = dev_get_phys_port_id(dev, &ppid);
if (err) {
if (err == -EOPNOTSUPP)
return 0;
return err;
}
if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
return -EMSGSIZE;
return 0;
}
static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
{
char name[IFNAMSIZ];
int err;
err = dev_get_phys_port_name(dev, name, sizeof(name));
if (err) {
if (err == -EOPNOTSUPP)
return 0;
return err;
}
if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
return -EMSGSIZE;
return 0;
}
static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
{
struct netdev_phys_item_id ppid = { };
int err;
err = dev_get_port_parent_id(dev, &ppid, false);
if (err) {
if (err == -EOPNOTSUPP)
return 0;
return err;
}
if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
return -EMSGSIZE;
return 0;
}
static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
struct net_device *dev)
{
struct rtnl_link_stats64 *sp;
struct nlattr *attr;
attr = nla_reserve_64bit(skb, IFLA_STATS64,
sizeof(struct rtnl_link_stats64), IFLA_PAD);
if (!attr)
return -EMSGSIZE;
sp = nla_data(attr);
dev_get_stats(dev, sp);
attr = nla_reserve(skb, IFLA_STATS,
sizeof(struct rtnl_link_stats));
if (!attr)
return -EMSGSIZE;
copy_rtnl_link_stats(nla_data(attr), sp);
return 0;
}
static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
struct net_device *dev,
int vfs_num,
struct nlattr *vfinfo)
{
struct ifla_vf_rss_query_en vf_rss_query_en;
struct nlattr *vf, *vfstats, *vfvlanlist;
struct ifla_vf_link_state vf_linkstate;
struct ifla_vf_vlan_info vf_vlan_info;
struct ifla_vf_spoofchk vf_spoofchk;
struct ifla_vf_tx_rate vf_tx_rate;
struct ifla_vf_stats vf_stats;
struct ifla_vf_trust vf_trust;
struct ifla_vf_vlan vf_vlan;
struct ifla_vf_rate vf_rate;
struct ifla_vf_mac vf_mac;
struct ifla_vf_broadcast vf_broadcast;
struct ifla_vf_info ivi;
struct ifla_vf_guid node_guid;
struct ifla_vf_guid port_guid;
memset(&ivi, 0, sizeof(ivi));
/* Not all SR-IOV capable drivers support the
* spoofcheck and "RSS query enable" query. Preset to
* -1 so the user space tool can detect that the driver
* didn't report anything.
*/
ivi.spoofchk = -1;
ivi.rss_query_en = -1;
ivi.trusted = -1;
/* The default value for VF link state is "auto"
* IFLA_VF_LINK_STATE_AUTO which equals zero
*/
ivi.linkstate = 0;
/* VLAN Protocol by default is 802.1Q */
ivi.vlan_proto = htons(ETH_P_8021Q);
if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
return 0;
memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
vf_mac.vf =
vf_vlan.vf =
vf_vlan_info.vf =
vf_rate.vf =
vf_tx_rate.vf =
vf_spoofchk.vf =
vf_linkstate.vf =
vf_rss_query_en.vf =
vf_trust.vf =
node_guid.vf =
port_guid.vf = ivi.vf;
memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
vf_vlan.vlan = ivi.vlan;
vf_vlan.qos = ivi.qos;
vf_vlan_info.vlan = ivi.vlan;
vf_vlan_info.qos = ivi.qos;
vf_vlan_info.vlan_proto = ivi.vlan_proto;
vf_tx_rate.rate = ivi.max_tx_rate;
vf_rate.min_tx_rate = ivi.min_tx_rate;
vf_rate.max_tx_rate = ivi.max_tx_rate;
vf_spoofchk.setting = ivi.spoofchk;
vf_linkstate.link_state = ivi.linkstate;
vf_rss_query_en.setting = ivi.rss_query_en;
vf_trust.setting = ivi.trusted;
vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
if (!vf)
goto nla_put_vfinfo_failure;
if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
&vf_rate) ||
nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
&vf_tx_rate) ||
nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
&vf_spoofchk) ||
nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
&vf_linkstate) ||
nla_put(skb, IFLA_VF_RSS_QUERY_EN,
sizeof(vf_rss_query_en),
&vf_rss_query_en) ||
nla_put(skb, IFLA_VF_TRUST,
sizeof(vf_trust), &vf_trust))
goto nla_put_vf_failure;
memset(&node_guid, 0, sizeof(node_guid));
memset(&port_guid, 0, sizeof(port_guid));
if (dev->netdev_ops->ndo_get_vf_guid &&
!dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
&port_guid)) {
if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
&node_guid) ||
nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
&port_guid))
goto nla_put_vf_failure;
}
vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
if (!vfvlanlist)
goto nla_put_vf_failure;
if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
&vf_vlan_info)) {
nla_nest_cancel(skb, vfvlanlist);
goto nla_put_vf_failure;
}
nla_nest_end(skb, vfvlanlist);
memset(&vf_stats, 0, sizeof(vf_stats));
if (dev->netdev_ops->ndo_get_vf_stats)
dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
&vf_stats);
vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
if (!vfstats)
goto nla_put_vf_failure;
if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
vf_stats.multicast, IFLA_VF_STATS_PAD) ||
nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
nla_nest_cancel(skb, vfstats);
goto nla_put_vf_failure;
}
nla_nest_end(skb, vfstats);
nla_nest_end(skb, vf);
return 0;
nla_put_vf_failure:
nla_nest_cancel(skb, vf);
nla_put_vfinfo_failure:
nla_nest_cancel(skb, vfinfo);
return -EMSGSIZE;
}
static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
struct net_device *dev,
u32 ext_filter_mask)
{
struct nlattr *vfinfo;
int i, num_vfs;
if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
return 0;
num_vfs = dev_num_vf(dev->dev.parent);
if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
return -EMSGSIZE;
if (!dev->netdev_ops->ndo_get_vf_config)
return 0;
vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
if (!vfinfo)
return -EMSGSIZE;
for (i = 0; i < num_vfs; i++) {
if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
return -EMSGSIZE;
}
nla_nest_end(skb, vfinfo);
return 0;
}
static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
{
struct rtnl_link_ifmap map;
memset(&map, 0, sizeof(map));
map.mem_start = dev->mem_start;
map.mem_end = dev->mem_end;
map.base_addr = dev->base_addr;
map.irq = dev->irq;
map.dma = dev->dma;
map.port = dev->if_port;
if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
return -EMSGSIZE;
return 0;
}
static u32 rtnl_xdp_prog_skb(struct net_device *dev)
{
const struct bpf_prog *generic_xdp_prog;
ASSERT_RTNL();
generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
if (!generic_xdp_prog)
return 0;
return generic_xdp_prog->aux->id;
}
static u32 rtnl_xdp_prog_drv(struct net_device *dev)
{
return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf, XDP_QUERY_PROG);
}
static u32 rtnl_xdp_prog_hw(struct net_device *dev)
{
return __dev_xdp_query(dev, dev->netdev_ops->ndo_bpf,
XDP_QUERY_PROG_HW);
}
static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
u32 (*get_prog_id)(struct net_device *dev))
{
u32 curr_id;
int err;
curr_id = get_prog_id(dev);
if (!curr_id)
return 0;
*prog_id = curr_id;
err = nla_put_u32(skb, attr, curr_id);
if (err)
return err;
if (*mode != XDP_ATTACHED_NONE)
*mode = XDP_ATTACHED_MULTI;
else
*mode = tgt_mode;
return 0;
}
static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
{
struct nlattr *xdp;
u32 prog_id;
int err;
u8 mode;
xdp = nla_nest_start_noflag(skb, IFLA_XDP);
if (!xdp)
return -EMSGSIZE;
prog_id = 0;
mode = XDP_ATTACHED_NONE;
err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
if (err)
goto err_cancel;
err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
if (err)
goto err_cancel;
err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
if (err)
goto err_cancel;
err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
if (err)
goto err_cancel;
if (prog_id && mode != XDP_ATTACHED_MULTI) {
err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
if (err)
goto err_cancel;
}
nla_nest_end(skb, xdp);
return 0;
err_cancel:
nla_nest_cancel(skb, xdp);
return err;
}
static u32 rtnl_get_event(unsigned long event)
{
u32 rtnl_event_type = IFLA_EVENT_NONE;
switch (event) {
case NETDEV_REBOOT:
rtnl_event_type = IFLA_EVENT_REBOOT;
break;
case NETDEV_FEAT_CHANGE:
rtnl_event_type = IFLA_EVENT_FEATURES;
break;
case NETDEV_BONDING_FAILOVER:
rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
break;
case NETDEV_NOTIFY_PEERS:
rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
break;
case NETDEV_RESEND_IGMP:
rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
break;
case NETDEV_CHANGEINFODATA:
rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
break;
default:
break;
}
return rtnl_event_type;
}
static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
{
const struct net_device *upper_dev;
int ret = 0;
rcu_read_lock();
upper_dev = netdev_master_upper_dev_get_rcu(dev);
if (upper_dev)
ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
rcu_read_unlock();
return ret;
}
static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
bool force)
{
int ifindex = dev_get_iflink(dev);
if (force || dev->ifindex != ifindex)
return nla_put_u32(skb, IFLA_LINK, ifindex);
return 0;
}
static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
struct net_device *dev)
{
char buf[IFALIASZ];
int ret;
ret = dev_get_alias(dev, buf, sizeof(buf));
return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
}
static int rtnl_fill_link_netnsid(struct sk_buff *skb,
const struct net_device *dev,
struct net *src_net, gfp_t gfp)
{
bool put_iflink = false;
if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
if (!net_eq(dev_net(dev), link_net)) {
int id = peernet2id_alloc(src_net, link_net, gfp);
if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
return -EMSGSIZE;
put_iflink = true;
}
}
return nla_put_iflink(skb, dev, put_iflink);
}
static int rtnl_fill_link_af(struct sk_buff *skb,
const struct net_device *dev,
u32 ext_filter_mask)
{
const struct rtnl_af_ops *af_ops;
struct nlattr *af_spec;
af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
if (!af_spec)
return -EMSGSIZE;
list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
struct nlattr *af;
int err;
if (!af_ops->fill_link_af)
continue;
af = nla_nest_start_noflag(skb, af_ops->family);
if (!af)
return -EMSGSIZE;
err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
/*
* 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)
return -EMSGSIZE;
nla_nest_end(skb, af);
}
nla_nest_end(skb, af_spec);
return 0;
}
static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
const struct net_device *dev)
{
struct netdev_name_node *name_node;
int count = 0;
list_for_each_entry(name_node, &dev->name_node->list, list) {
if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
return -EMSGSIZE;
count++;
}
return count;
}
static int rtnl_fill_prop_list(struct sk_buff *skb,
const struct net_device *dev)
{
struct nlattr *prop_list;
int ret;
prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
if (!prop_list)
return -EMSGSIZE;
ret = rtnl_fill_alt_ifnames(skb, dev);
if (ret <= 0)
goto nest_cancel;
nla_nest_end(skb, prop_list);
return 0;
nest_cancel:
nla_nest_cancel(skb, prop_list);
return ret;
}
static int rtnl_fill_ifinfo(struct sk_buff *skb,
struct net_device *dev, struct net *src_net,
int type, u32 pid, u32 seq, u32 change,
unsigned int flags, u32 ext_filter_mask,
u32 event, int *new_nsid, int new_ifindex,
int tgt_netnsid, gfp_t gfp)
{
struct ifinfomsg *ifm;
struct nlmsghdr *nlh;
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;
if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
goto nla_put_failure;
if (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_MIN_MTU, dev->min_mtu) ||
nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
nla_put_u32(skb, IFLA_GROUP, dev->group) ||
nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
#ifdef CONFIG_RPS
nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
#endif
put_master_ifindex(skb, dev) ||
nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
(dev->qdisc &&
nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
nla_put_ifalias(skb, dev) ||
nla_put_u32(skb, IFLA_CARRIER_CHANGES,
atomic_read(&dev->carrier_up_count) +
atomic_read(&dev->carrier_down_count)) ||
nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
atomic_read(&dev->carrier_up_count)) ||
nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
atomic_read(&dev->carrier_down_count)))
goto nla_put_failure;
if (event != IFLA_EVENT_NONE) {
if (nla_put_u32(skb, IFLA_EVENT, event))
goto nla_put_failure;
}
if (rtnl_fill_link_ifmap(skb, dev))
goto nla_put_failure;
if (dev->addr_len) {
if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
goto nla_put_failure;
}
if (rtnl_phys_port_id_fill(skb, dev))
goto nla_put_failure;
if (rtnl_phys_port_name_fill(skb, dev))
goto nla_put_failure;
if (rtnl_phys_switch_id_fill(skb, dev))
goto nla_put_failure;
if (rtnl_fill_stats(skb, dev))
goto nla_put_failure;
if (rtnl_fill_vf(skb, dev, ext_filter_mask))
goto nla_put_failure;
if (rtnl_port_fill(skb, dev, ext_filter_mask))
goto nla_put_failure;
if (rtnl_xdp_fill(skb, dev))
goto nla_put_failure;
if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
if (rtnl_link_fill(skb, dev) < 0)
goto nla_put_failure;
}
if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
goto nla_put_failure;
if (new_nsid &&
nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
goto nla_put_failure;
if (new_ifindex &&
nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
goto nla_put_failure;
if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
goto nla_put_failure;
rcu_read_lock();
if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
goto nla_put_failure_rcu;
rcu_read_unlock();
if (rtnl_fill_prop_list(skb, dev))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
nla_put_failure_rcu:
rcu_read_unlock();
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static 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_CARRIER] = { .type = NLA_U8 },
[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 is a string, but policy is set to NLA_BINARY to
* allow 0-length string (needed to remove an alias).
*/
[IFLA_IFALIAS] = { .type = NLA_BINARY, .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 },
[IFLA_EXT_MASK] = { .type = NLA_U32 },
[IFLA_PROMISCUITY] = { .type = NLA_U32 },
[IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
[IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
[IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 },
[IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 },
[IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
[IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
[IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
[IFLA_LINK_NETNSID] = { .type = NLA_S32 },
[IFLA_PROTO_DOWN] = { .type = NLA_U8 },
[IFLA_XDP] = { .type = NLA_NESTED },
[IFLA_EVENT] = { .type = NLA_U32 },
[IFLA_GROUP] = { .type = NLA_U32 },
[IFLA_TARGET_NETNSID] = { .type = NLA_S32 },
[IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
[IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
[IFLA_MIN_MTU] = { .type = NLA_U32 },
[IFLA_MAX_MTU] = { .type = NLA_U32 },
[IFLA_PROP_LIST] = { .type = NLA_NESTED },
[IFLA_ALT_IFNAME] = { .type = NLA_STRING,
.len = ALTIFNAMSIZ - 1 },
[IFLA_PERM_ADDRESS] = { .type = NLA_REJECT },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
[IFLA_INFO_KIND] = { .type = NLA_STRING },
[IFLA_INFO_DATA] = { .type = NLA_NESTED },
[IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
[IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
};
static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
[IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
[IFLA_VF_BROADCAST] = { .type = NLA_REJECT },
[IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
[IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED },
[IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
[IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
[IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
[IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
[IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
[IFLA_VF_STATS] = { .type = NLA_NESTED },
[IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
[IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) },
[IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) },
};
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_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, },
/* Unused, but we need to keep it here since user space could
* fill it. It's also broken with regard to NLA_BINARY use in
* combination with structs.
*/
[IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
.len = sizeof(struct ifla_port_vsi) },
};
static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
[IFLA_XDP_FD] = { .type = NLA_S32 },
[IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
[IFLA_XDP_FLAGS] = { .type = NLA_U32 },
[IFLA_XDP_PROG_ID] = { .type = NLA_U32 },
};
static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
{
const struct rtnl_link_ops *ops = NULL;
struct nlattr *linfo[IFLA_INFO_MAX + 1];
if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
return NULL;
if (linfo[IFLA_INFO_KIND]) {
char kind[MODULE_NAME_LEN];
nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
ops = rtnl_link_ops_get(kind);
}
return ops;
}
static bool link_master_filtered(struct net_device *dev, int master_idx)
{
struct net_device *master;
if (!master_idx)
return false;
master = netdev_master_upper_dev_get(dev);
if (!master || master->ifindex != master_idx)
return true;
return false;
}
static bool link_kind_filtered(const struct net_device *dev,
const struct rtnl_link_ops *kind_ops)
{
if (kind_ops && dev->rtnl_link_ops != kind_ops)
return true;
return false;
}
static bool link_dump_filtered(struct net_device *dev,
int master_idx,
const struct rtnl_link_ops *kind_ops)
{
if (link_master_filtered(dev, master_idx) ||
link_kind_filtered(dev, kind_ops))
return true;
return false;
}
/**
* rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
* @sk: netlink socket
* @netnsid: network namespace identifier
*
* Returns the network namespace identified by netnsid on success or an error
* pointer on failure.
*/
struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
{
struct net *net;
net = get_net_ns_by_id(sock_net(sk), netnsid);
if (!net)
return ERR_PTR(-EINVAL);
/* For now, the caller is required to have CAP_NET_ADMIN in
* the user namespace owning the target net ns.
*/
if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
put_net(net);
return ERR_PTR(-EACCES);
}
return net;
}
EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
bool strict_check, struct nlattr **tb,
struct netlink_ext_ack *extack)
{
int hdrlen;
if (strict_check) {
struct ifinfomsg *ifm;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
NL_SET_ERR_MSG(extack, "Invalid header for link dump");
return -EINVAL;
}
ifm = nlmsg_data(nlh);
if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
ifm->ifi_change) {
NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
return -EINVAL;
}
if (ifm->ifi_index) {
NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
return -EINVAL;
}
return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
IFLA_MAX, ifla_policy,
extack);
}
/* A hack to preserve kernel<->userspace interface.
* The correct header is ifinfomsg. It is consistent with rtnl_getlink.
* However, before Linux v3.9 the code here assumed rtgenmsg and that's
* what iproute2 < v3.9.0 used.
* We can detect the old iproute2. Even including the IFLA_EXT_MASK
* attribute, its netlink message is shorter than struct ifinfomsg.
*/
hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
extack);
}
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netlink_ext_ack *extack = cb->extack;
const struct nlmsghdr *nlh = cb->nlh;
struct net *net = sock_net(skb->sk);
struct net *tgt_net = net;
int h, s_h;
int idx = 0, s_idx;
struct net_device *dev;
struct hlist_head *head;
struct nlattr *tb[IFLA_MAX+1];
u32 ext_filter_mask = 0;
const struct rtnl_link_ops *kind_ops = NULL;
unsigned int flags = NLM_F_MULTI;
int master_idx = 0;
int netnsid = -1;
int err, i;
s_h = cb->args[0];
s_idx = cb->args[1];
err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
if (err < 0) {
if (cb->strict_check)
return err;
goto walk_entries;
}
for (i = 0; i <= IFLA_MAX; ++i) {
if (!tb[i])
continue;
/* new attributes should only be added with strict checking */
switch (i) {
case IFLA_TARGET_NETNSID:
netnsid = nla_get_s32(tb[i]);
tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
if (IS_ERR(tgt_net)) {
NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
return PTR_ERR(tgt_net);
}
break;
case IFLA_EXT_MASK:
ext_filter_mask = nla_get_u32(tb[i]);
break;
case IFLA_MASTER:
master_idx = nla_get_u32(tb[i]);
break;
case IFLA_LINKINFO:
kind_ops = linkinfo_to_kind_ops(tb[i]);
break;
default:
if (cb->strict_check) {
NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
return -EINVAL;
}
}
}
if (master_idx || kind_ops)
flags |= NLM_F_DUMP_FILTERED;
walk_entries:
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &tgt_net->dev_index_head[h];
hlist_for_each_entry(dev, head, index_hlist) {
if (link_dump_filtered(dev, master_idx, kind_ops))
goto cont;
if (idx < s_idx)
goto cont;
err = rtnl_fill_ifinfo(skb, dev, net,
RTM_NEWLINK,
NETLINK_CB(cb->skb).portid,
nlh->nlmsg_seq, 0, flags,
ext_filter_mask, 0, NULL, 0,
netnsid, GFP_KERNEL);
if (err < 0) {
if (likely(skb->len))
goto out;
goto out_err;
}
cont:
idx++;
}
}
out:
err = skb->len;
out_err:
cb->args[1] = idx;
cb->args[0] = h;
cb->seq = net->dev_base_seq;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
if (netnsid >= 0)
put_net(tgt_net);
return err;
}
int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
struct netlink_ext_ack *exterr)
{
return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
exterr);
}
EXPORT_SYMBOL(rtnl_nla_parse_ifla);
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);
/* Figure out which network namespace we are talking about by
* examining the link attributes in the following order:
*
* 1. IFLA_NET_NS_PID
* 2. IFLA_NET_NS_FD
* 3. IFLA_TARGET_NETNSID
*/
static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
struct nlattr *tb[])
{
struct net *net;
if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
return rtnl_link_get_net(src_net, tb);
if (!tb[IFLA_TARGET_NETNSID])
return get_net(src_net);
net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
if (!net)
return ERR_PTR(-EINVAL);
return net;
}
static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
struct net *src_net,
struct nlattr *tb[], int cap)
{
struct net *net;
net = rtnl_link_get_net_by_nlattr(src_net, tb);
if (IS_ERR(net))
return net;
if (!netlink_ns_capable(skb, net->user_ns, cap)) {
put_net(net);
return ERR_PTR(-EPERM);
}
return net;
}
/* Verify that rtnetlink requests do not pass additional properties
* potentially referring to different network namespaces.
*/
static int rtnl_ensure_unique_netns(struct nlattr *tb[],
struct netlink_ext_ack *extack,
bool netns_id_only)
{
if (netns_id_only) {
if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
return 0;
NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
return -EOPNOTSUPP;
}
if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
goto invalid_attr;
if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
goto invalid_attr;
if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
goto invalid_attr;
return 0;
invalid_attr:
NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
return -EINVAL;
}
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;
rcu_read_lock();
af_ops = rtnl_af_lookup(nla_type(af));
if (!af_ops) {
rcu_read_unlock();
return -EAFNOSUPPORT;
}
if (!af_ops->set_link_af) {
rcu_read_unlock();
return -EOPNOTSUPP;
}
if (af_ops->validate_link_af) {
err = af_ops->validate_link_af(dev, af);
if (err < 0) {
rcu_read_unlock();
return err;
}
}
rcu_read_unlock();
}
}
return 0;
}
static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
int guid_type)
{
const struct net_device_ops *ops = dev->netdev_ops;
return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
}
static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
{
if (dev->type != ARPHRD_INFINIBAND)
return -EOPNOTSUPP;
return handle_infiniband_guid(dev, ivt, guid_type);
}
static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
{
const struct net_device_ops *ops = dev->netdev_ops;
int err = -EINVAL;
if (tb[IFLA_VF_MAC]) {
struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
if (ivm->vf >= INT_MAX)
return -EINVAL;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_mac)
err = ops->ndo_set_vf_mac(dev, ivm->vf,
ivm->mac);
if (err < 0)
return err;
}
if (tb[IFLA_VF_VLAN]) {
struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
if (ivv->vf >= INT_MAX)
return -EINVAL;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_vlan)
err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
ivv->qos,
htons(ETH_P_8021Q));
if (err < 0)
return err;
}
if (tb[IFLA_VF_VLAN_LIST]) {
struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
struct nlattr *attr;
int rem, len = 0;
err = -EOPNOTSUPP;
if (!ops->ndo_set_vf_vlan)
return err;
nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
nla_len(attr) < NLA_HDRLEN) {
return -EINVAL;
}
if (len >= MAX_VLAN_LIST_LEN)
return -EOPNOTSUPP;
ivvl[len] = nla_data(attr);
len++;
}
if (len == 0)
return -EINVAL;
if (ivvl[0]->vf >= INT_MAX)
return -EINVAL;
err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
ivvl[0]->qos, ivvl[0]->vlan_proto);
if (err < 0)
return err;
}
if (tb[IFLA_VF_TX_RATE]) {
struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
struct ifla_vf_info ivf;
if (ivt->vf >= INT_MAX)
return -EINVAL;
err = -EOPNOTSUPP;
if (ops->ndo_get_vf_config)
err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
if (err < 0)
return err;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_rate)
err = ops->ndo_set_vf_rate(dev, ivt->vf,
ivf.min_tx_rate,
ivt->rate);
if (err < 0)
return err;
}
if (tb[IFLA_VF_RATE]) {
struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
if (ivt->vf >= INT_MAX)
return -EINVAL;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_rate)
err = ops->ndo_set_vf_rate(dev, ivt->vf,
ivt->min_tx_rate,
ivt->max_tx_rate);
if (err < 0)
return err;
}
if (tb[IFLA_VF_SPOOFCHK]) {
struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
if (ivs->vf >= INT_MAX)
return -EINVAL;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_spoofchk)
err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
ivs->setting);
if (err < 0)
return err;
}
if (tb[IFLA_VF_LINK_STATE]) {
struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
if (ivl->vf >= INT_MAX)
return -EINVAL;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_link_state)
err = ops->ndo_set_vf_link_state(dev, ivl->vf,
ivl->link_state);
if (err < 0)
return err;
}
if (tb[IFLA_VF_RSS_QUERY_EN]) {
struct ifla_vf_rss_query_en *ivrssq_en;
err = -EOPNOTSUPP;
ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
if (ivrssq_en->vf >= INT_MAX)
return -EINVAL;
if (ops->ndo_set_vf_rss_query_en)
err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
ivrssq_en->setting);
if (err < 0)
return err;
}
if (tb[IFLA_VF_TRUST]) {
struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
if (ivt->vf >= INT_MAX)
return -EINVAL;
err = -EOPNOTSUPP;
if (ops->ndo_set_vf_trust)
err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
if (err < 0)
return err;
}
if (tb[IFLA_VF_IB_NODE_GUID]) {
struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
if (ivt->vf >= INT_MAX)
return -EINVAL;
if (!ops->ndo_set_vf_guid)
return -EOPNOTSUPP;
return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
}
if (tb[IFLA_VF_IB_PORT_GUID]) {
struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
if (ivt->vf >= INT_MAX)
return -EINVAL;
if (!ops->ndo_set_vf_guid)
return -EOPNOTSUPP;
return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
}
return err;
}
static int do_set_master(struct net_device *dev, int ifindex,
struct netlink_ext_ack *extack)
{
struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
const struct net_device_ops *ops;
int err;
if (upper_dev) {
if (upper_dev->ifindex == ifindex)
return 0;
ops = upper_dev->netdev_ops;
if (ops->ndo_del_slave) {
err = ops->ndo_del_slave(upper_dev, dev);
if (err)
return err;
netdev_update_lockdep_key(dev);
} else {
return -EOPNOTSUPP;
}
}
if (ifindex) {
upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
if (!upper_dev)
return -EINVAL;
ops = upper_dev->netdev_ops;
if (ops->ndo_add_slave) {
err = ops->ndo_add_slave(upper_dev, dev, extack);
if (err)
return err;
} else {
return -EOPNOTSUPP;
}
}
return 0;
}
#define DO_SETLINK_MODIFIED 0x01
/* notify flag means notify + modified. */
#define DO_SETLINK_NOTIFY 0x03
static int do_setlink(const struct sk_buff *skb,
struct net_device *dev, struct ifinfomsg *ifm,
struct netlink_ext_ack *extack,
struct nlattr **tb, char *ifname, int status)
{
const struct net_device_ops *ops = dev->netdev_ops;
int err;
err = validate_linkmsg(dev, tb);
if (err < 0)
return err;
if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
tb, CAP_NET_ADMIN);
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;
status |= DO_SETLINK_MODIFIED;
}
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;
status |= DO_SETLINK_NOTIFY;
}
if (tb[IFLA_ADDRESS]) {
struct sockaddr *sa;
int len;
len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
sizeof(*sa));
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 = dev_set_mac_address(dev, sa, extack);
kfree(sa);
if (err)
goto errout;
status |= DO_SETLINK_MODIFIED;
}
if (tb[IFLA_MTU]) {
err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
if (err < 0)
goto errout;
status |= DO_SETLINK_MODIFIED;
}
if (tb[IFLA_GROUP]) {
dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
status |= DO_SETLINK_NOTIFY;
}
/*
* 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;
status |= DO_SETLINK_MODIFIED;
}
if (tb[IFLA_IFALIAS]) {
err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
nla_len(tb[IFLA_IFALIAS]));
if (err < 0)
goto errout;
status |= DO_SETLINK_NOTIFY;
}
if (tb[IFLA_BROADCAST]) {
nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
}
if (ifm->ifi_flags || ifm->ifi_change) {
err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
extack);
if (err < 0)
goto errout;
}
if (tb[IFLA_MASTER]) {
err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
if (err)
goto errout;
status |= DO_SETLINK_MODIFIED;
}
if (tb[IFLA_CARRIER]) {
err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
if (err)
goto errout;
status |= DO_SETLINK_MODIFIED;
}
if (tb[IFLA_TXQLEN]) {
unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
err = dev_change_tx_queue_len(dev, value);
if (err)
goto errout;
status |= DO_SETLINK_MODIFIED;
}
if (tb[IFLA_GSO_MAX_SIZE]) {
u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
if (max_size > GSO_MAX_SIZE) {
err = -EINVAL;
goto errout;
}
if (dev->gso_max_size ^ max_size) {
netif_set_gso_max_size(dev, max_size);
status |= DO_SETLINK_MODIFIED;
}
}
if (tb[IFLA_GSO_MAX_SEGS]) {
u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
if (max_segs > GSO_MAX_SEGS) {
err = -EINVAL;
goto errout;
}
if (dev->gso_max_segs ^ max_segs) {
dev->gso_max_segs = max_segs;
status |= DO_SETLINK_MODIFIED;
}
}
if (tb[IFLA_OPERSTATE])
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
if (tb[IFLA_LINKMODE]) {
unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
write_lock_bh(&dev_base_lock);
if (dev->link_mode ^ value)
status |= DO_SETLINK_NOTIFY;
dev->link_mode = value;
write_unlock_bh(&dev_base_lock);
}
if (tb[IFLA_VFINFO_LIST]) {
struct nlattr *vfinfo[IFLA_VF_MAX + 1];
struct nlattr *attr;
int rem;
nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
if (nla_type(attr) != IFLA_VF_INFO ||
nla_len(attr) < NLA_HDRLEN) {
err = -EINVAL;
goto errout;
}
err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
attr,
ifla_vf_policy,
NULL);
if (err < 0)
goto errout;
err = do_setvfinfo(dev, vfinfo);
if (err < 0)
goto errout;
status |= DO_SETLINK_NOTIFY;
}
}
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 ||
nla_len(attr) < NLA_HDRLEN) {
err = -EINVAL;
goto errout;
}
err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
attr,
ifla_port_policy,
NULL);
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;
status |= DO_SETLINK_NOTIFY;
}
}
err = 0;
if (tb[IFLA_PORT_SELF]) {
struct nlattr *port[IFLA_PORT_MAX+1];
err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
tb[IFLA_PORT_SELF],
ifla_port_policy, NULL);
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;
status |= DO_SETLINK_NOTIFY;
}
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;
rcu_read_lock();
BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
err = af_ops->set_link_af(dev, af);
if (err < 0) {
rcu_read_unlock();
goto errout;
}
rcu_read_unlock();
status |= DO_SETLINK_NOTIFY;
}
}
err = 0;
if (tb[IFLA_PROTO_DOWN]) {
err = dev_change_proto_down(dev,
nla_get_u8(tb[IFLA_PROTO_DOWN]));
if (err)
goto errout;
status |= DO_SETLINK_NOTIFY;
}
if (tb[IFLA_XDP]) {
struct nlattr *xdp[IFLA_XDP_MAX + 1];
u32 xdp_flags = 0;
err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
tb[IFLA_XDP],
ifla_xdp_policy, NULL);
if (err < 0)
goto errout;
if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
err = -EINVAL;
goto errout;
}
if (xdp[IFLA_XDP_FLAGS]) {
xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
if (xdp_flags & ~XDP_FLAGS_MASK) {
err = -EINVAL;
goto errout;
}
if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
err = -EINVAL;
goto errout;
}
}
if (xdp[IFLA_XDP_FD]) {
err = dev_change_xdp_fd(dev, extack,
nla_get_s32(xdp[IFLA_XDP_FD]),
xdp_flags);
if (err)
goto errout;
status |= DO_SETLINK_NOTIFY;
}
}
errout:
if (status & DO_SETLINK_MODIFIED) {
if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
netdev_state_change(dev);
if (err < 0)
net_warn_ratelimited("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);
}
return err;
}
static struct net_device *rtnl_dev_get(struct net *net,
struct nlattr *ifname_attr,
struct nlattr *altifname_attr,
char *ifname)
{
char buffer[ALTIFNAMSIZ];
if (!ifname) {
ifname = buffer;
if (ifname_attr)
nla_strlcpy(ifname, ifname_attr, IFNAMSIZ);
else if (altifname_attr)
nla_strlcpy(ifname, altifname_attr, ALTIFNAMSIZ);
else
return NULL;
}
return __dev_get_by_name(net, ifname);
}
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
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_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
ifla_policy, extack);
if (err < 0)
goto errout;
err = rtnl_ensure_unique_netns(tb, extack, false);
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] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
else
goto errout;
if (dev == NULL) {
err = -ENODEV;
goto errout;
}
err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
errout:
return err;
}
static int rtnl_group_dellink(const struct net *net, int group)
{
struct net_device *dev, *aux;
LIST_HEAD(list_kill);
bool found = false;
if (!group)
return -EPERM;
for_each_netdev(net, dev) {
if (dev->group == group) {
const struct rtnl_link_ops *ops;
found = true;
ops = dev->rtnl_link_ops;
if (!ops || !ops->dellink)
return -EOPNOTSUPP;
}
}
if (!found)
return -ENODEV;
for_each_netdev_safe(net, dev, aux) {
if (dev->group == group) {
const struct rtnl_link_ops *ops;
ops = dev->rtnl_link_ops;
ops->dellink(dev, &list_kill);
}
}
unregister_netdevice_many(&list_kill);
return 0;
}
int rtnl_delete_link(struct net_device *dev)
{
const struct rtnl_link_ops *ops;
LIST_HEAD(list_kill);
ops = dev->rtnl_link_ops;
if (!ops || !ops->dellink)
return -EOPNOTSUPP;
ops->dellink(dev, &list_kill);
unregister_netdevice_many(&list_kill);
return 0;
}
EXPORT_SYMBOL_GPL(rtnl_delete_link);
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct net *tgt_net = net;
struct net_device *dev = NULL;
struct ifinfomsg *ifm;
struct nlattr *tb[IFLA_MAX+1];
int err;
int netnsid = -1;
err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
ifla_policy, extack);
if (err < 0)
return err;
err = rtnl_ensure_unique_netns(tb, extack, true);
if (err < 0)
return err;
if (tb[IFLA_TARGET_NETNSID]) {
netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
if (IS_ERR(tgt_net))
return PTR_ERR(tgt_net);
}
err = -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
tb[IFLA_ALT_IFNAME], NULL);
else if (tb[IFLA_GROUP])
err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
else
goto out;
if (!dev) {
if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
err = -ENODEV;
goto out;
}
err = rtnl_delete_link(dev);
out:
if (netnsid >= 0)
put_net(tgt_net);
return err;
}
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),
NULL);
if (err < 0)
return err;
}
if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
__dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
} else {
dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
__dev_notify_flags(dev, old_flags, ~0U);
}
return 0;
}
EXPORT_SYMBOL(rtnl_configure_link);
struct net_device *rtnl_create_link(struct net *net, const char *ifname,
unsigned char name_assign_type,
const struct rtnl_link_ops *ops,
struct nlattr *tb[],
struct netlink_ext_ack *extack)
{
struct net_device *dev;
unsigned int num_tx_queues = 1;
unsigned int num_rx_queues = 1;
if (tb[IFLA_NUM_TX_QUEUES])
num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
else if (ops->get_num_tx_queues)
num_tx_queues = ops->get_num_tx_queues();
if (tb[IFLA_NUM_RX_QUEUES])
num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
else if (ops->get_num_rx_queues)
num_rx_queues = ops->get_num_rx_queues();
if (num_tx_queues < 1 || num_tx_queues > 4096) {
NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
return ERR_PTR(-EINVAL);
}
if (num_rx_queues < 1 || num_rx_queues > 4096) {
NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
return ERR_PTR(-EINVAL);
}
dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
ops->setup, num_tx_queues, num_rx_queues);
if (!dev)
return ERR_PTR(-ENOMEM);
dev_net_set(dev, net);
dev->rtnl_link_ops = ops;
dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
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]));
dev->addr_assign_type = NET_ADDR_SET;
}
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]));
if (tb[IFLA_GSO_MAX_SIZE])
netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
if (tb[IFLA_GSO_MAX_SEGS])
dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
return dev;
}
EXPORT_SYMBOL(rtnl_create_link);
static int rtnl_group_changelink(const struct sk_buff *skb,
struct net *net, int group,
struct ifinfomsg *ifm,
struct netlink_ext_ack *extack,
struct nlattr **tb)
{
struct net_device *dev, *aux;
int err;
for_each_netdev_safe(net, dev, aux) {
if (dev->group == group) {
err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
if (err < 0)
return err;
}
}
return 0;
}
static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attr, struct netlink_ext_ack *extack)
{
struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
unsigned char name_assign_type = NET_NAME_USER;
struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
const struct rtnl_link_ops *m_ops = NULL;
struct net_device *master_dev = NULL;
struct net *net = sock_net(skb->sk);
const struct rtnl_link_ops *ops;
struct nlattr *tb[IFLA_MAX + 1];
struct net *dest_net, *link_net;
struct nlattr **slave_data;
char kind[MODULE_NAME_LEN];
struct net_device *dev;
struct ifinfomsg *ifm;
char ifname[IFNAMSIZ];
struct nlattr **data;
int err;
#ifdef CONFIG_MODULES
replay:
#endif
err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
ifla_policy, extack);
if (err < 0)
return err;
err = rtnl_ensure_unique_netns(tb, extack, false);
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 (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
else
dev = NULL;
if (dev) {
master_dev = netdev_master_upper_dev_get(dev);
if (master_dev)
m_ops = master_dev->rtnl_link_ops;
}
err = validate_linkmsg(dev, tb);
if (err < 0)
return err;
if (tb[IFLA_LINKINFO]) {
err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
tb[IFLA_LINKINFO],
ifla_info_policy, NULL);
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;
}
data = NULL;
if (ops) {
if (ops->maxtype > RTNL_MAX_TYPE)
return -EINVAL;
if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
err = nla_parse_nested_deprecated(attr, ops->maxtype,
linkinfo[IFLA_INFO_DATA],
ops->policy, extack);
if (err < 0)
return err;
data = attr;
}
if (ops->validate) {
err = ops->validate(tb, data, extack);
if (err < 0)
return err;
}
}
slave_data = NULL;
if (m_ops) {
if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
return -EINVAL;
if (m_ops->slave_maxtype &&
linkinfo[IFLA_INFO_SLAVE_DATA]) {
err = nla_parse_nested_deprecated(slave_attr,
m_ops->slave_maxtype,
linkinfo[IFLA_INFO_SLAVE_DATA],
m_ops->slave_policy,
extack);
if (err < 0)
return err;
slave_data = slave_attr;
}
}
if (dev) {
int status = 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, extack);
if (err < 0)
return err;
status |= DO_SETLINK_NOTIFY;
}
if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
if (!m_ops || !m_ops->slave_changelink)
return -EOPNOTSUPP;
err = m_ops->slave_changelink(master_dev, dev, tb,
slave_data, extack);
if (err < 0)
return err;
status |= DO_SETLINK_NOTIFY;
}
return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
}
if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
return rtnl_group_changelink(skb, net,
nla_get_u32(tb[IFLA_GROUP]),
ifm, extack, tb);
return -ENODEV;
}
if (tb[IFLA_MAP] || 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
NL_SET_ERR_MSG(extack, "Unknown device type");
return -EOPNOTSUPP;
}
if (!ops->setup)
return -EOPNOTSUPP;
if (!ifname[0]) {
snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
name_assign_type = NET_NAME_ENUM;
}
dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
if (IS_ERR(dest_net))
return PTR_ERR(dest_net);
if (tb[IFLA_LINK_NETNSID]) {
int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
link_net = get_net_ns_by_id(dest_net, id);
if (!link_net) {
NL_SET_ERR_MSG(extack, "Unknown network namespace id");
err = -EINVAL;
goto out;
}
err = -EPERM;
if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
goto out;
} else {
link_net = NULL;
}
dev = rtnl_create_link(link_net ? : dest_net, ifname,
name_assign_type, ops, tb, extack);
if (IS_ERR(dev)) {
err = PTR_ERR(dev);
goto out;
}
dev->ifindex = ifm->ifi_index;
if (ops->newlink) {
err = ops->newlink(link_net ? : net, dev, tb, data, extack);
/* Drivers should call free_netdev() in ->destructor
* and unregister it on failure after registration
* so that device could be finally freed in rtnl_unlock.
*/
if (err < 0) {
/* If device is not registered at all, free it now */
if (dev->reg_state == NETREG_UNINITIALIZED)
free_netdev(dev);
goto out;
}
} else {
err = register_netdevice(dev);
if (err < 0) {
free_netdev(dev);
goto out;
}
}
err = rtnl_configure_link(dev, ifm);
if (err < 0)
goto out_unregister;
if (link_net) {
err = dev_change_net_namespace(dev, dest_net, ifname);
if (err < 0)
goto out_unregister;
}
if (tb[IFLA_MASTER]) {
err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
if (err)
goto out_unregister;
}
out:
if (link_net)
put_net(link_net);
put_net(dest_net);
return err;
out_unregister:
if (ops->newlink) {
LIST_HEAD(list_kill);
ops->dellink(dev, &list_kill);
unregister_netdevice_many(&list_kill);
} else {
unregister_netdevice(dev);
}
goto out;
}
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct nlattr **attr;
int ret;
attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
if (!attr)
return -ENOMEM;
ret = __rtnl_newlink(skb, nlh, attr, extack);
kfree(attr);
return ret;
}
static int rtnl_valid_getlink_req(struct sk_buff *skb,
const struct nlmsghdr *nlh,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct ifinfomsg *ifm;
int i, err;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
NL_SET_ERR_MSG(extack, "Invalid header for get link");
return -EINVAL;
}
if (!netlink_strict_get_check(skb))
return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
ifla_policy, extack);
ifm = nlmsg_data(nlh);
if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
ifm->ifi_change) {
NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
return -EINVAL;
}
err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
ifla_policy, extack);
if (err)
return err;
for (i = 0; i <= IFLA_MAX; i++) {
if (!tb[i])
continue;
switch (i) {
case IFLA_IFNAME:
case IFLA_ALT_IFNAME:
case IFLA_EXT_MASK:
case IFLA_TARGET_NETNSID:
break;
default:
NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
return -EINVAL;
}
}
return 0;
}
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct net *tgt_net = net;
struct ifinfomsg *ifm;
struct nlattr *tb[IFLA_MAX+1];
struct net_device *dev = NULL;
struct sk_buff *nskb;
int netnsid = -1;
int err;
u32 ext_filter_mask = 0;
err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
if (err < 0)
return err;
err = rtnl_ensure_unique_netns(tb, extack, true);
if (err < 0)
return err;
if (tb[IFLA_TARGET_NETNSID]) {
netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
if (IS_ERR(tgt_net))
return PTR_ERR(tgt_net);
}
if (tb[IFLA_EXT_MASK])
ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
err = -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
tb[IFLA_ALT_IFNAME], NULL);
else
goto out;
err = -ENODEV;
if (dev == NULL)
goto out;
err = -ENOBUFS;
nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
if (nskb == NULL)
goto out;
err = rtnl_fill_ifinfo(nskb, dev, net,
RTM_NEWLINK, NETLINK_CB(skb).portid,
nlh->nlmsg_seq, 0, 0, ext_filter_mask,
0, NULL, 0, netnsid, GFP_KERNEL);
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).portid);
out:
if (netnsid >= 0)
put_net(tgt_net);
return err;
}
static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
bool *changed, struct netlink_ext_ack *extack)
{
char *alt_ifname;
int err;
err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
if (err)
return err;
alt_ifname = nla_data(attr);
if (cmd == RTM_NEWLINKPROP) {
alt_ifname = kstrdup(alt_ifname, GFP_KERNEL);
if (!alt_ifname)
return -ENOMEM;
err = netdev_name_node_alt_create(dev, alt_ifname);
if (err) {
kfree(alt_ifname);
return err;
}
} else if (cmd == RTM_DELLINKPROP) {
err = netdev_name_node_alt_destroy(dev, alt_ifname);
if (err)
return err;
} else {
WARN_ON(1);
return 0;
}
*changed = true;
return 0;
}
static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[IFLA_MAX + 1];
struct net_device *dev;
struct ifinfomsg *ifm;
bool changed = false;
struct nlattr *attr;
int err, rem;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
if (err)
return err;
err = rtnl_ensure_unique_netns(tb, extack, true);
if (err)
return err;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
tb[IFLA_ALT_IFNAME], NULL);
else
return -EINVAL;
if (!dev)
return -ENODEV;
if (!tb[IFLA_PROP_LIST])
return 0;
nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
switch (nla_type(attr)) {
case IFLA_ALT_IFNAME:
err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
if (err)
return err;
break;
}
}
if (changed)
netdev_state_change(dev);
return 0;
}
static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
}
static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
}
static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct net_device *dev;
struct nlattr *tb[IFLA_MAX+1];
u32 ext_filter_mask = 0;
u16 min_ifinfo_dump_size = 0;
int hdrlen;
/* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
if (tb[IFLA_EXT_MASK])
ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
}
if (!ext_filter_mask)
return NLMSG_GOODSIZE;
/*
* traverse the list of net devices and compute the minimum
* buffer size based upon the filter mask.
*/
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
if_nlmsg_size(dev,
ext_filter_mask));
}
rcu_read_unlock();
return nlmsg_total_size(min_ifinfo_dump_size);
}
static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
{
int idx;
int s_idx = cb->family;
int type = cb->nlh->nlmsg_type - RTM_BASE;
int ret = 0;
if (s_idx == 0)
s_idx = 1;
for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
struct rtnl_link **tab;
struct rtnl_link *link;
rtnl_dumpit_func dumpit;
if (idx < s_idx || idx == PF_PACKET)
continue;
if (type < 0 || type >= RTM_NR_MSGTYPES)
continue;
tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
if (!tab)
continue;
link = tab[type];
if (!link)
continue;
dumpit = link->dumpit;
if (!dumpit)
continue;
if (idx > s_idx) {
memset(&cb->args[0], 0, sizeof(cb->args));
cb->prev_seq = 0;
cb->seq = 0;
}
ret = dumpit(skb, cb);
if (ret)
break;
}
cb->family = idx;
return skb->len ? : ret;
}
struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
unsigned int change,
u32 event, gfp_t flags, int *new_nsid,
int new_ifindex)
{
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, 0)), flags);
if (skb == NULL)
goto errout;
err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
type, 0, 0, change, 0, 0, event,
new_nsid, new_ifindex, -1, flags);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
return skb;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
return NULL;
}
void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
{
struct net *net = dev_net(dev);
rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
}
static void rtmsg_ifinfo_event(int type, struct net_device *dev,
unsigned int change, u32 event,
gfp_t flags, int *new_nsid, int new_ifindex)
{
struct sk_buff *skb;
if (dev->reg_state != NETREG_REGISTERED)
return;
skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
new_ifindex);
if (skb)
rtmsg_ifinfo_send(skb, dev, flags);
}
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
gfp_t flags)
{
rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
NULL, 0);
}
void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
gfp_t flags, int *new_nsid, int new_ifindex)
{
rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
new_nsid, new_ifindex);
}
static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
struct net_device *dev,
u8 *addr, u16 vid, u32 pid, u32 seq,
int type, unsigned int flags,
int nlflags, u16 ndm_state)
{
struct nlmsghdr *nlh;
struct ndmsg *ndm;
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
if (!nlh)
return -EMSGSIZE;
ndm = nlmsg_data(nlh);
ndm->ndm_family = AF_BRIDGE;
ndm->ndm_pad1 = 0;
ndm->ndm_pad2 = 0;
ndm->ndm_flags = flags;
ndm->ndm_type = 0;
ndm->ndm_ifindex = dev->ifindex;
ndm->ndm_state = ndm_state;
if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
goto nla_put_failure;
if (vid)
if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static inline size_t rtnl_fdb_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ndmsg)) +
nla_total_size(ETH_ALEN) + /* NDA_LLADDR */
nla_total_size(sizeof(u16)) + /* NDA_VLAN */
0;
}
static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
u16 ndm_state)
{
struct net *net = dev_net(dev);
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
if (!skb)
goto errout;
err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
0, 0, type, NTF_SELF, 0, ndm_state);
if (err < 0) {
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
return;
errout:
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}
/*
* ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
*/
int ndo_dflt_fdb_add(struct ndmsg *ndm,
struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr, u16 vid,
u16 flags)
{
int err = -EINVAL;
/* If aging addresses are supported device will need to
* implement its own handler for this.
*/
if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
pr_info("%s: FDB only supports static addresses\n", dev->name);
return err;
}
if (vid) {
pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
return err;
}
if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
err = dev_uc_add_excl(dev, addr);
else if (is_multicast_ether_addr(addr))
err = dev_mc_add_excl(dev, addr);
/* Only return duplicate errors if NLM_F_EXCL is set */
if (err == -EEXIST && !(flags & NLM_F_EXCL))
err = 0;
return err;
}
EXPORT_SYMBOL(ndo_dflt_fdb_add);
static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
struct netlink_ext_ack *extack)
{
u16 vid = 0;
if (vlan_attr) {
if (nla_len(vlan_attr) != sizeof(u16)) {
NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
return -EINVAL;
}
vid = nla_get_u16(vlan_attr);
if (!vid || vid >= VLAN_VID_MASK) {
NL_SET_ERR_MSG(extack, "invalid vlan id");
return -EINVAL;
}
}
*p_vid = vid;
return 0;
}
static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct ndmsg *ndm;
struct nlattr *tb[NDA_MAX+1];
struct net_device *dev;
u8 *addr;
u16 vid;
int err;
err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
extack);
if (err < 0)
return err;
ndm = nlmsg_data(nlh);
if (ndm->ndm_ifindex == 0) {
NL_SET_ERR_MSG(extack, "invalid ifindex");
return -EINVAL;
}
dev = __dev_get_by_index(net, ndm->ndm_ifindex);
if (dev == NULL) {
NL_SET_ERR_MSG(extack, "unknown ifindex");
return -ENODEV;
}
if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
NL_SET_ERR_MSG(extack, "invalid address");
return -EINVAL;
}
if (dev->type != ARPHRD_ETHER) {
NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
return -EINVAL;
}
addr = nla_data(tb[NDA_LLADDR]);
err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
if (err)
return err;
err = -EOPNOTSUPP;
/* Support fdb on master device the net/bridge default case */
if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
(dev->priv_flags & IFF_BRIDGE_PORT)) {
struct net_device *br_dev = netdev_master_upper_dev_get(dev);
const struct net_device_ops *ops = br_dev->netdev_ops;
err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
nlh->nlmsg_flags, extack);
if (err)
goto out;
else
ndm->ndm_flags &= ~NTF_MASTER;
}
/* Embedded bridge, macvlan, and any other device support */
if ((ndm->ndm_flags & NTF_SELF)) {
if (dev->netdev_ops->ndo_fdb_add)
err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
vid,
nlh->nlmsg_flags,
extack);
else
err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
nlh->nlmsg_flags);
if (!err) {
rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
ndm->ndm_state);
ndm->ndm_flags &= ~NTF_SELF;
}
}
out:
return err;
}
/*
* ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
*/
int ndo_dflt_fdb_del(struct ndmsg *ndm,
struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr, u16 vid)
{
int err = -EINVAL;
/* If aging addresses are supported device will need to
* implement its own handler for this.
*/
if (!(ndm->ndm_state & NUD_PERMANENT)) {
pr_info("%s: FDB only supports static addresses\n", dev->name);
return err;
}
if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
err = dev_uc_del(dev, addr);
else if (is_multicast_ether_addr(addr))
err = dev_mc_del(dev, addr);
return err;
}
EXPORT_SYMBOL(ndo_dflt_fdb_del);
static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct ndmsg *ndm;
struct nlattr *tb[NDA_MAX+1];
struct net_device *dev;
int err = -EINVAL;
__u8 *addr;
u16 vid;
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
extack);
if (err < 0)
return err;
ndm = nlmsg_data(nlh);
if (ndm->ndm_ifindex == 0) {
NL_SET_ERR_MSG(extack, "invalid ifindex");
return -EINVAL;
}
dev = __dev_get_by_index(net, ndm->ndm_ifindex);
if (dev == NULL) {
NL_SET_ERR_MSG(extack, "unknown ifindex");
return -ENODEV;
}
if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
NL_SET_ERR_MSG(extack, "invalid address");
return -EINVAL;
}
if (dev->type != ARPHRD_ETHER) {
NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
return -EINVAL;
}
addr = nla_data(tb[NDA_LLADDR]);
err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
if (err)
return err;
err = -EOPNOTSUPP;
/* Support fdb on master device the net/bridge default case */
if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
(dev->priv_flags & IFF_BRIDGE_PORT)) {
struct net_device *br_dev = netdev_master_upper_dev_get(dev);
const struct net_device_ops *ops = br_dev->netdev_ops;
if (ops->ndo_fdb_del)
err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
if (err)
goto out;
else
ndm->ndm_flags &= ~NTF_MASTER;
}
/* Embedded bridge, macvlan, and any other device support */
if (ndm->ndm_flags & NTF_SELF) {
if (dev->netdev_ops->ndo_fdb_del)
err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
vid);
else
err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
if (!err) {
rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
ndm->ndm_state);
ndm->ndm_flags &= ~NTF_SELF;
}
}
out:
return err;
}
static int nlmsg_populate_fdb(struct sk_buff *skb,
struct netlink_callback *cb,
struct net_device *dev,
int *idx,
struct netdev_hw_addr_list *list)
{
struct netdev_hw_addr *ha;
int err;
u32 portid, seq;
portid = NETLINK_CB(cb->skb).portid;
seq = cb->nlh->nlmsg_seq;
list_for_each_entry(ha, &list->list, list) {
if (*idx < cb->args[2])
goto skip;
err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
portid, seq,
RTM_NEWNEIGH, NTF_SELF,
NLM_F_MULTI, NUD_PERMANENT);
if (err < 0)
return err;
skip:
*idx += 1;
}
return 0;
}
/**
* ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
* @skb: socket buffer to store message in
* @cb: netlink callback
* @dev: netdevice
* @filter_dev: ignored
* @idx: the number of FDB table entries dumped is added to *@idx
*
* Default netdevice operation to dump the existing unicast address list.
* Returns number of addresses from list put in skb.
*/
int ndo_dflt_fdb_dump(struct sk_buff *skb,
struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev,
int *idx)
{
int err;
if (dev->type != ARPHRD_ETHER)
return -EINVAL;
netif_addr_lock_bh(dev);
err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
if (err)
goto out;
err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
out:
netif_addr_unlock_bh(dev);
return err;
}
EXPORT_SYMBOL(ndo_dflt_fdb_dump);
static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
int *br_idx, int *brport_idx,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[NDA_MAX + 1];
struct ndmsg *ndm;
int err, i;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
return -EINVAL;
}
ndm = nlmsg_data(nlh);
if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
ndm->ndm_flags || ndm->ndm_type) {
NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
return -EINVAL;
}
err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
NDA_MAX, NULL, extack);
if (err < 0)
return err;
*brport_idx = ndm->ndm_ifindex;
for (i = 0; i <= NDA_MAX; ++i) {
if (!tb[i])
continue;
switch (i) {
case NDA_IFINDEX:
if (nla_len(tb[i]) != sizeof(u32)) {
NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
return -EINVAL;
}
*brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
break;
case NDA_MASTER:
if (nla_len(tb[i]) != sizeof(u32)) {
NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
return -EINVAL;
}
*br_idx = nla_get_u32(tb[NDA_MASTER]);
break;
default:
NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
return -EINVAL;
}
}
return 0;
}
static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
int *br_idx, int *brport_idx,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[IFLA_MAX+1];
int err;
/* A hack to preserve kernel<->userspace interface.
* Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
* However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
* So, check for ndmsg with an optional u32 attribute (not used here).
* Fortunately these sizes don't conflict with the size of ifinfomsg
* with an optional attribute.
*/
if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
(nlmsg_len(nlh) != sizeof(struct ndmsg) +
nla_attr_size(sizeof(u32)))) {
struct ifinfomsg *ifm;
err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
tb, IFLA_MAX, ifla_policy,
extack);
if (err < 0) {
return -EINVAL;
} else if (err == 0) {
if (tb[IFLA_MASTER])
*br_idx = nla_get_u32(tb[IFLA_MASTER]);
}
ifm = nlmsg_data(nlh);
*brport_idx = ifm->ifi_index;
}
return 0;
}
static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net_device *dev;
struct net_device *br_dev = NULL;
const struct net_device_ops *ops = NULL;
const struct net_device_ops *cops = NULL;
struct net *net = sock_net(skb->sk);
struct hlist_head *head;
int brport_idx = 0;
int br_idx = 0;
int h, s_h;
int idx = 0, s_idx;
int err = 0;
int fidx = 0;
if (cb->strict_check)
err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
cb->extack);
else
err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
cb->extack);
if (err < 0)
return err;
if (br_idx) {
br_dev = __dev_get_by_index(net, br_idx);
if (!br_dev)
return -ENODEV;
ops = br_dev->netdev_ops;
}
s_h = cb->args[0];
s_idx = cb->args[1];
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &net->dev_index_head[h];
hlist_for_each_entry(dev, head, index_hlist) {
if (brport_idx && (dev->ifindex != brport_idx))
continue;
if (!br_idx) { /* user did not specify a specific bridge */
if (dev->priv_flags & IFF_BRIDGE_PORT) {
br_dev = netdev_master_upper_dev_get(dev);
cops = br_dev->netdev_ops;
}
} else {
if (dev != br_dev &&
!(dev->priv_flags & IFF_BRIDGE_PORT))
continue;
if (br_dev != netdev_master_upper_dev_get(dev) &&
!(dev->priv_flags & IFF_EBRIDGE))
continue;
cops = ops;
}
if (idx < s_idx)
goto cont;
if (dev->priv_flags & IFF_BRIDGE_PORT) {
if (cops && cops->ndo_fdb_dump) {
err = cops->ndo_fdb_dump(skb, cb,
br_dev, dev,
&fidx);
if (err == -EMSGSIZE)
goto out;
}
}
if (dev->netdev_ops->ndo_fdb_dump)
err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
dev, NULL,
&fidx);
else
err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
&fidx);
if (err == -EMSGSIZE)
goto out;
cops = NULL;
/* reset fdb offset to 0 for rest of the interfaces */
cb->args[2] = 0;
fidx = 0;
cont:
idx++;
}
}
out:
cb->args[0] = h;
cb->args[1] = idx;
cb->args[2] = fidx;
return skb->len;
}
static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
struct nlattr **tb, u8 *ndm_flags,
int *br_idx, int *brport_idx, u8 **addr,
u16 *vid, struct netlink_ext_ack *extack)
{
struct ndmsg *ndm;
int err, i;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
return -EINVAL;
}
ndm = nlmsg_data(nlh);
if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
ndm->ndm_type) {
NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
return -EINVAL;
}
if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
return -EINVAL;
}
err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
NDA_MAX, nda_policy, extack);
if (err < 0)
return err;
*ndm_flags = ndm->ndm_flags;
*brport_idx = ndm->ndm_ifindex;
for (i = 0; i <= NDA_MAX; ++i) {
if (!tb[i])
continue;
switch (i) {
case NDA_MASTER:
*br_idx = nla_get_u32(tb[i]);
break;
case NDA_LLADDR:
if (nla_len(tb[i]) != ETH_ALEN) {
NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
return -EINVAL;
}
*addr = nla_data(tb[i]);
break;
case NDA_VLAN:
err = fdb_vid_parse(tb[i], vid, extack);
if (err)
return err;
break;
case NDA_VNI:
break;
default:
NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
return -EINVAL;
}
}
return 0;
}
static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net_device *dev = NULL, *br_dev = NULL;
const struct net_device_ops *ops = NULL;
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NDA_MAX + 1];
struct sk_buff *skb;
int brport_idx = 0;
u8 ndm_flags = 0;
int br_idx = 0;
u8 *addr = NULL;
u16 vid = 0;
int err;
err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
&brport_idx, &addr, &vid, extack);
if (err < 0)
return err;
if (!addr) {
NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
return -EINVAL;
}
if (brport_idx) {
dev = __dev_get_by_index(net, brport_idx);
if (!dev) {
NL_SET_ERR_MSG(extack, "Unknown device ifindex");
return -ENODEV;
}
}
if (br_idx) {
if (dev) {
NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
return -EINVAL;
}
br_dev = __dev_get_by_index(net, br_idx);
if (!br_dev) {
NL_SET_ERR_MSG(extack, "Invalid master ifindex");
return -EINVAL;
}
ops = br_dev->netdev_ops;
}
if (dev) {
if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
if (!(dev->priv_flags & IFF_BRIDGE_PORT)) {
NL_SET_ERR_MSG(extack, "Device is not a bridge port");
return -EINVAL;
}
br_dev = netdev_master_upper_dev_get(dev);
if (!br_dev) {
NL_SET_ERR_MSG(extack, "Master of device not found");
return -EINVAL;
}
ops = br_dev->netdev_ops;
} else {
if (!(ndm_flags & NTF_SELF)) {
NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
return -EINVAL;
}
ops = dev->netdev_ops;
}
}
if (!br_dev && !dev) {
NL_SET_ERR_MSG(extack, "No device specified");
return -ENODEV;
}
if (!ops || !ops->ndo_fdb_get) {
NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
return -EOPNOTSUPP;
}
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
if (br_dev)
dev = br_dev;
err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, extack);
if (err)
goto out;
return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
out:
kfree_skb(skb);
return err;
}
static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
unsigned int attrnum, unsigned int flag)
{
if (mask & flag)
return nla_put_u8(skb, attrnum, !!(flags & flag));
return 0;
}
int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
struct net_device *dev, u16 mode,
u32 flags, u32 mask, int nlflags,
u32 filter_mask,
int (*vlan_fill)(struct sk_buff *skb,
struct net_device *dev,
u32 filter_mask))
{
struct nlmsghdr *nlh;
struct ifinfomsg *ifm;
struct nlattr *br_afspec;
struct nlattr *protinfo;
u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
struct net_device *br_dev = netdev_master_upper_dev_get(dev);
int err = 0;
nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
if (nlh == NULL)
return -EMSGSIZE;
ifm = nlmsg_data(nlh);
ifm->ifi_family = AF_BRIDGE;
ifm->__ifi_pad = 0;
ifm->ifi_type = dev->type;
ifm->ifi_index = dev->ifindex;
ifm->ifi_flags = dev_get_flags(dev);
ifm->ifi_change = 0;
if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
(br_dev &&
nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
(dev->addr_len &&
nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
(dev->ifindex != dev_get_iflink(dev) &&
nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
goto nla_put_failure;
br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
if (!br_afspec)
goto nla_put_failure;
if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
nla_nest_cancel(skb, br_afspec);
goto nla_put_failure;
}
if (mode != BRIDGE_MODE_UNDEF) {
if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
nla_nest_cancel(skb, br_afspec);
goto nla_put_failure;
}
}
if (vlan_fill) {
err = vlan_fill(skb, dev, filter_mask);
if (err) {
nla_nest_cancel(skb, br_afspec);
goto nla_put_failure;
}
}
nla_nest_end(skb, br_afspec);
protinfo = nla_nest_start(skb, IFLA_PROTINFO);
if (!protinfo)
goto nla_put_failure;
if (brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_FAST_LEAVE,
BR_MULTICAST_FAST_LEAVE) ||
brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_LEARNING, BR_LEARNING) ||
brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
brport_nla_put_flag(skb, flags, mask,
IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
nla_nest_cancel(skb, protinfo);
goto nla_put_failure;
}
nla_nest_end(skb, protinfo);
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
return err ? err : -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
bool strict_check, u32 *filter_mask,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[IFLA_MAX+1];
int err, i;
if (strict_check) {
struct ifinfomsg *ifm;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
return -EINVAL;
}
ifm = nlmsg_data(nlh);
if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
ifm->ifi_change || ifm->ifi_index) {
NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
return -EINVAL;
}
err = nlmsg_parse_deprecated_strict(nlh,
sizeof(struct ifinfomsg),
tb, IFLA_MAX, ifla_policy,
extack);
} else {
err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
tb, IFLA_MAX, ifla_policy,
extack);
}
if (err < 0)
return err;
/* new attributes should only be added with strict checking */
for (i = 0; i <= IFLA_MAX; ++i) {
if (!tb[i])
continue;
switch (i) {
case IFLA_EXT_MASK:
*filter_mask = nla_get_u32(tb[i]);
break;
default:
if (strict_check) {
NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
return -EINVAL;
}
}
}
return 0;
}
static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nlmsghdr *nlh = cb->nlh;
struct net *net = sock_net(skb->sk);
struct net_device *dev;
int idx = 0;
u32 portid = NETLINK_CB(cb->skb).portid;
u32 seq = nlh->nlmsg_seq;
u32 filter_mask = 0;
int err;
err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
cb->extack);
if (err < 0 && cb->strict_check)
return err;
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
const struct net_device_ops *ops = dev->netdev_ops;
struct net_device *br_dev = netdev_master_upper_dev_get(dev);
if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
if (idx >= cb->args[0]) {
err = br_dev->netdev_ops->ndo_bridge_getlink(
skb, portid, seq, dev,
filter_mask, NLM_F_MULTI);
if (err < 0 && err != -EOPNOTSUPP) {
if (likely(skb->len))
break;
goto out_err;
}
}
idx++;
}
if (ops->ndo_bridge_getlink) {
if (idx >= cb->args[0]) {
err = ops->ndo_bridge_getlink(skb, portid,
seq, dev,
filter_mask,
NLM_F_MULTI);
if (err < 0 && err != -EOPNOTSUPP) {
if (likely(skb->len))
break;
goto out_err;
}
}
idx++;
}
}
err = skb->len;
out_err:
rcu_read_unlock();
cb->args[0] = idx;
return err;
}
static inline size_t bridge_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ nla_total_size(sizeof(u32)) /* IFLA_MASTER */
+ nla_total_size(sizeof(u32)) /* IFLA_MTU */
+ nla_total_size(sizeof(u32)) /* IFLA_LINK */
+ nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
+ nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
+ nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
+ nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
+ nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
}
static int rtnl_bridge_notify(struct net_device *dev)
{
struct net *net = dev_net(dev);
struct sk_buff *skb;
int err = -EOPNOTSUPP;
if (!dev->netdev_ops->ndo_bridge_getlink)
return 0;
skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
if (!skb) {
err = -ENOMEM;
goto errout;
}
err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
if (err < 0)
goto errout;
if (!skb->len)
goto errout;
rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
return 0;
errout:
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
if (err)
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
return err;
}
static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
struct net_device *dev;
struct nlattr *br_spec, *attr = NULL;
int rem, err = -EOPNOTSUPP;
u16 flags = 0;
bool have_flags = false;
if (nlmsg_len(nlh) < sizeof(*ifm))
return -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifi_family != AF_BRIDGE)
return -EPFNOSUPPORT;
dev = __dev_get_by_index(net, ifm->ifi_index);
if (!dev) {
NL_SET_ERR_MSG(extack, "unknown ifindex");
return -ENODEV;
}
br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
if (br_spec) {
nla_for_each_nested(attr, br_spec, rem) {
if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
if (nla_len(attr) < sizeof(flags))
return -EINVAL;
have_flags = true;
flags = nla_get_u16(attr);
break;
}
}
}
if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
struct net_device *br_dev = netdev_master_upper_dev_get(dev);
if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
err = -EOPNOTSUPP;
goto out;
}
err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
extack);
if (err)
goto out;
flags &= ~BRIDGE_FLAGS_MASTER;
}
if ((flags & BRIDGE_FLAGS_SELF)) {
if (!dev->netdev_ops->ndo_bridge_setlink)
err = -EOPNOTSUPP;
else
err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
flags,
extack);
if (!err) {
flags &= ~BRIDGE_FLAGS_SELF;
/* Generate event to notify upper layer of bridge
* change
*/
err = rtnl_bridge_notify(dev);
}
}
if (have_flags)
memcpy(nla_data(attr), &flags, sizeof(flags));
out:
return err;
}
static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
struct net_device *dev;
struct nlattr *br_spec, *attr = NULL;
int rem, err = -EOPNOTSUPP;
u16 flags = 0;
bool have_flags = false;
if (nlmsg_len(nlh) < sizeof(*ifm))
return -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifi_family != AF_BRIDGE)
return -EPFNOSUPPORT;
dev = __dev_get_by_index(net, ifm->ifi_index);
if (!dev) {
NL_SET_ERR_MSG(extack, "unknown ifindex");
return -ENODEV;
}
br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
if (br_spec) {
nla_for_each_nested(attr, br_spec, rem) {
if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
if (nla_len(attr) < sizeof(flags))
return -EINVAL;
have_flags = true;
flags = nla_get_u16(attr);
break;
}
}
}
if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
struct net_device *br_dev = netdev_master_upper_dev_get(dev);
if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
err = -EOPNOTSUPP;
goto out;
}
err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
if (err)
goto out;
flags &= ~BRIDGE_FLAGS_MASTER;
}
if ((flags & BRIDGE_FLAGS_SELF)) {
if (!dev->netdev_ops->ndo_bridge_dellink)
err = -EOPNOTSUPP;
else
err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
flags);
if (!err) {
flags &= ~BRIDGE_FLAGS_SELF;
/* Generate event to notify upper layer of bridge
* change
*/
err = rtnl_bridge_notify(dev);
}
}
if (have_flags)
memcpy(nla_data(attr), &flags, sizeof(flags));
out:
return err;
}
static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
{
return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
(!idxattr || idxattr == attrid);
}
#define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
static int rtnl_get_offload_stats_attr_size(int attr_id)
{
switch (attr_id) {
case IFLA_OFFLOAD_XSTATS_CPU_HIT:
return sizeof(struct rtnl_link_stats64);
}
return 0;
}
static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
int *prividx)
{
struct nlattr *attr = NULL;
int attr_id, size;
void *attr_data;
int err;
if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
dev->netdev_ops->ndo_get_offload_stats))
return -ENODATA;
for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
if (attr_id < *prividx)
continue;
size = rtnl_get_offload_stats_attr_size(attr_id);
if (!size)
continue;
if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
continue;
attr = nla_reserve_64bit(skb, attr_id, size,
IFLA_OFFLOAD_XSTATS_UNSPEC);
if (!attr)
goto nla_put_failure;
attr_data = nla_data(attr);
memset(attr_data, 0, size);
err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
attr_data);
if (err)
goto get_offload_stats_failure;
}
if (!attr)
return -ENODATA;
*prividx = 0;
return 0;
nla_put_failure:
err = -EMSGSIZE;
get_offload_stats_failure:
*prividx = attr_id;
return err;
}
static int rtnl_get_offload_stats_size(const struct net_device *dev)
{
int nla_size = 0;
int attr_id;
int size;
if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
dev->netdev_ops->ndo_get_offload_stats))
return 0;
for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
continue;
size = rtnl_get_offload_stats_attr_size(attr_id);
nla_size += nla_total_size_64bit(size);
}
if (nla_size != 0)
nla_size += nla_total_size(0);
return nla_size;
}
static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
int type, u32 pid, u32 seq, u32 change,
unsigned int flags, unsigned int filter_mask,
int *idxattr, int *prividx)
{
struct if_stats_msg *ifsm;
struct nlmsghdr *nlh;
struct nlattr *attr;
int s_prividx = *prividx;
int err;
ASSERT_RTNL();
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
if (!nlh)
return -EMSGSIZE;
ifsm = nlmsg_data(nlh);
ifsm->family = PF_UNSPEC;
ifsm->pad1 = 0;
ifsm->pad2 = 0;
ifsm->ifindex = dev->ifindex;
ifsm->filter_mask = filter_mask;
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
struct rtnl_link_stats64 *sp;
attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
sizeof(struct rtnl_link_stats64),
IFLA_STATS_UNSPEC);
if (!attr)
goto nla_put_failure;
sp = nla_data(attr);
dev_get_stats(dev, sp);
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
if (ops && ops->fill_linkxstats) {
*idxattr = IFLA_STATS_LINK_XSTATS;
attr = nla_nest_start_noflag(skb,
IFLA_STATS_LINK_XSTATS);
if (!attr)
goto nla_put_failure;
err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
nla_nest_end(skb, attr);
if (err)
goto nla_put_failure;
*idxattr = 0;
}
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
*idxattr)) {
const struct rtnl_link_ops *ops = NULL;
const struct net_device *master;
master = netdev_master_upper_dev_get(dev);
if (master)
ops = master->rtnl_link_ops;
if (ops && ops->fill_linkxstats) {
*idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
attr = nla_nest_start_noflag(skb,
IFLA_STATS_LINK_XSTATS_SLAVE);
if (!attr)
goto nla_put_failure;
err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
nla_nest_end(skb, attr);
if (err)
goto nla_put_failure;
*idxattr = 0;
}
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
*idxattr)) {
*idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
attr = nla_nest_start_noflag(skb,
IFLA_STATS_LINK_OFFLOAD_XSTATS);
if (!attr)
goto nla_put_failure;
err = rtnl_get_offload_stats(skb, dev, prividx);
if (err == -ENODATA)
nla_nest_cancel(skb, attr);
else
nla_nest_end(skb, attr);
if (err && err != -ENODATA)
goto nla_put_failure;
*idxattr = 0;
}
if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
struct rtnl_af_ops *af_ops;
*idxattr = IFLA_STATS_AF_SPEC;
attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
if (!attr)
goto nla_put_failure;
rcu_read_lock();
list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
if (af_ops->fill_stats_af) {
struct nlattr *af;
int err;
af = nla_nest_start_noflag(skb,
af_ops->family);
if (!af) {
rcu_read_unlock();
goto nla_put_failure;
}
err = af_ops->fill_stats_af(skb, dev);
if (err == -ENODATA) {
nla_nest_cancel(skb, af);
} else if (err < 0) {
rcu_read_unlock();
goto nla_put_failure;
}
nla_nest_end(skb, af);
}
}
rcu_read_unlock();
nla_nest_end(skb, attr);
*idxattr = 0;
}
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
/* not a multi message or no progress mean a real error */
if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
nlmsg_cancel(skb, nlh);
else
nlmsg_end(skb, nlh);
return -EMSGSIZE;
}
static size_t if_nlmsg_stats_size(const struct net_device *dev,
u32 filter_mask)
{
size_t size = 0;
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
int attr = IFLA_STATS_LINK_XSTATS;
if (ops && ops->get_linkxstats_size) {
size += nla_total_size(ops->get_linkxstats_size(dev,
attr));
/* for IFLA_STATS_LINK_XSTATS */
size += nla_total_size(0);
}
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
struct net_device *_dev = (struct net_device *)dev;
const struct rtnl_link_ops *ops = NULL;
const struct net_device *master;
/* netdev_master_upper_dev_get can't take const */
master = netdev_master_upper_dev_get(_dev);
if (master)
ops = master->rtnl_link_ops;
if (ops && ops->get_linkxstats_size) {
int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
size += nla_total_size(ops->get_linkxstats_size(dev,
attr));
/* for IFLA_STATS_LINK_XSTATS_SLAVE */
size += nla_total_size(0);
}
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
size += rtnl_get_offload_stats_size(dev);
if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
struct rtnl_af_ops *af_ops;
/* for IFLA_STATS_AF_SPEC */
size += nla_total_size(0);
rcu_read_lock();
list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
if (af_ops->get_stats_af_size) {
size += nla_total_size(
af_ops->get_stats_af_size(dev));
/* for AF_* */
size += nla_total_size(0);
}
}
rcu_read_unlock();
}
return size;
}
static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
bool is_dump, struct netlink_ext_ack *extack)
{
struct if_stats_msg *ifsm;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
return -EINVAL;
}
if (!strict_check)
return 0;
ifsm = nlmsg_data(nlh);
/* only requests using strict checks can pass data to influence
* the dump. The legacy exception is filter_mask.
*/
if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
return -EINVAL;
}
if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
return -EINVAL;
}
if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
return -EINVAL;
}
return 0;
}
static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct net_device *dev = NULL;
int idxattr = 0, prividx = 0;
struct if_stats_msg *ifsm;
struct sk_buff *nskb;
u32 filter_mask;
int err;
err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
false, extack);
if (err)
return err;
ifsm = nlmsg_data(nlh);
if (ifsm->ifindex > 0)
dev = __dev_get_by_index(net, ifsm->ifindex);
else
return -EINVAL;
if (!dev)
return -ENODEV;
filter_mask = ifsm->filter_mask;
if (!filter_mask)
return -EINVAL;
nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
if (!nskb)
return -ENOBUFS;
err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
0, filter_mask, &idxattr, &prividx);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
WARN_ON(err == -EMSGSIZE);
kfree_skb(nskb);
} else {
err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
}
return err;
}
static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netlink_ext_ack *extack = cb->extack;
int h, s_h, err, s_idx, s_idxattr, s_prividx;
struct net *net = sock_net(skb->sk);
unsigned int flags = NLM_F_MULTI;
struct if_stats_msg *ifsm;
struct hlist_head *head;
struct net_device *dev;
u32 filter_mask = 0;
int idx = 0;
s_h = cb->args[0];
s_idx = cb->args[1];
s_idxattr = cb->args[2];
s_prividx = cb->args[3];
cb->seq = net->dev_base_seq;
err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
if (err)
return err;
ifsm = nlmsg_data(cb->nlh);
filter_mask = ifsm->filter_mask;
if (!filter_mask) {
NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
return -EINVAL;
}
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &net->dev_index_head[h];
hlist_for_each_entry(dev, head, index_hlist) {
if (idx < s_idx)
goto cont;
err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, 0,
flags, filter_mask,
&s_idxattr, &s_prividx);
/* If we ran out of room on the first message,
* we're in trouble
*/
WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
if (err < 0)
goto out;
s_prividx = 0;
s_idxattr = 0;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
}
out:
cb->args[3] = s_prividx;
cb->args[2] = s_idxattr;
cb->args[1] = idx;
cb->args[0] = h;
return skb->len;
}
/* Process one rtnetlink message. */
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct rtnl_link *link;
struct module *owner;
int err = -EOPNOTSUPP;
rtnl_doit_func doit;
unsigned int flags;
int kind;
int family;
int type;
type = nlh->nlmsg_type;
if (type > RTM_MAX)
return -EOPNOTSUPP;
type -= RTM_BASE;
/* All the messages must have at least 1 byte length */
if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
return 0;
family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
kind = type&3;
if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
return -EPERM;
rcu_read_lock();
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
struct sock *rtnl;
rtnl_dumpit_func dumpit;
u16 min_dump_alloc = 0;
link = rtnl_get_link(family, type);
if (!link || !link->dumpit) {
family = PF_UNSPEC;
link = rtnl_get_link(family, type);
if (!link || !link->dumpit)
goto err_unlock;
}
owner = link->owner;
dumpit = link->dumpit;
if (type == RTM_GETLINK - RTM_BASE)
min_dump_alloc = rtnl_calcit(skb, nlh);
err = 0;
/* need to do this before rcu_read_unlock() */
if (!try_module_get(owner))
err = -EPROTONOSUPPORT;
rcu_read_unlock();
rtnl = net->rtnl;
if (err == 0) {
struct netlink_dump_control c = {
.dump = dumpit,
.min_dump_alloc = min_dump_alloc,
.module = owner,
};
err = netlink_dump_start(rtnl, skb, nlh, &c);
/* netlink_dump_start() will keep a reference on
* module if dump is still in progress.
*/
module_put(owner);
}
return err;
}
link = rtnl_get_link(family, type);
if (!link || !link->doit) {
family = PF_UNSPEC;
link = rtnl_get_link(PF_UNSPEC, type);
if (!link || !link->doit)
goto out_unlock;
}
owner = link->owner;
if (!try_module_get(owner)) {
err = -EPROTONOSUPPORT;
goto out_unlock;
}
flags = link->flags;
if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
doit = link->doit;
rcu_read_unlock();
if (doit)
err = doit(skb, nlh, extack);
module_put(owner);
return err;
}
rcu_read_unlock();
rtnl_lock();
link = rtnl_get_link(family, type);
if (link && link->doit)
err = link->doit(skb, nlh, extack);
rtnl_unlock();
module_put(owner);
return err;
out_unlock:
rcu_read_unlock();
return err;
err_unlock:
rcu_read_unlock();
return -EOPNOTSUPP;
}
static void rtnetlink_rcv(struct sk_buff *skb)
{
netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
}
static int rtnetlink_bind(struct net *net, int group)
{
switch (group) {
case RTNLGRP_IPV4_MROUTE_R:
case RTNLGRP_IPV6_MROUTE_R:
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
break;
}
return 0;
}
static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
switch (event) {
case NETDEV_REBOOT:
case NETDEV_CHANGEMTU:
case NETDEV_CHANGEADDR:
case NETDEV_CHANGENAME:
case NETDEV_FEAT_CHANGE:
case NETDEV_BONDING_FAILOVER:
case NETDEV_POST_TYPE_CHANGE:
case NETDEV_NOTIFY_PEERS:
case NETDEV_CHANGEUPPER:
case NETDEV_RESEND_IGMP:
case NETDEV_CHANGEINFODATA:
case NETDEV_CHANGELOWERSTATE:
case NETDEV_CHANGE_TX_QUEUE_LEN:
rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
GFP_KERNEL, NULL, 0);
break;
default:
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;
struct netlink_kernel_cfg cfg = {
.groups = RTNLGRP_MAX,
.input = rtnetlink_rcv,
.cb_mutex = &rtnl_mutex,
.flags = NL_CFG_F_NONROOT_RECV,
.bind = rtnetlink_bind,
};
sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
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)
{
if (register_pernet_subsys(&rtnetlink_net_ops))
panic("rtnetlink_init: cannot initialize rtnetlink\n");
register_netdevice_notifier(&rtnetlink_dev_notifier);
rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
rtnl_dump_ifinfo, 0);
rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
0);
}
Reference in New Issue View Git Blame Copy Permalink