d314774cf2
This patch changes the network device internal API to move adminstrative operations out of the network device structure and into a separate structure. This patch involves some hackery to maintain compatablity between the new and old model, so all 300+ drivers don't have to be changed at once. For drivers that aren't converted yet, the netdevice_ops virt function list still resides in the net_device structure. For old protocols, the new net_device_ops are copied out to the old net_device pointers. After the transistion is completed the nag message can be changed to an WARN_ON, and the compatiablity code can be made configurable. Some function pointers aren't moved: * destructor can't be in net_device_ops because it may need to be referenced after the module is unloaded. * neighbor setup is manipulated in a couple of places that need special consideration * hard_start_xmit is in the fast path for transmit. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1431 lines
34 KiB
C
1431 lines
34 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Routing netlink socket interface: protocol independent part.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Fixes:
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* Vitaly E. Lavrov RTA_OK arithmetics was wrong.
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/capability.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/security.h>
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#include <linux/mutex.h>
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#include <linux/if_addr.h>
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#include <linux/nsproxy.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/string.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/arp.h>
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#include <net/route.h>
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#include <net/udp.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <net/fib_rules.h>
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#include <net/rtnetlink.h>
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struct rtnl_link
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{
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rtnl_doit_func doit;
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rtnl_dumpit_func dumpit;
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};
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static DEFINE_MUTEX(rtnl_mutex);
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void rtnl_lock(void)
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{
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mutex_lock(&rtnl_mutex);
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}
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void __rtnl_unlock(void)
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{
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mutex_unlock(&rtnl_mutex);
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}
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void rtnl_unlock(void)
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{
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/* This fellow will unlock it for us. */
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netdev_run_todo();
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}
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int rtnl_trylock(void)
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{
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return mutex_trylock(&rtnl_mutex);
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}
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int rtnl_is_locked(void)
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{
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return mutex_is_locked(&rtnl_mutex);
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}
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static struct rtnl_link *rtnl_msg_handlers[NPROTO];
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static inline int rtm_msgindex(int msgtype)
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{
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int msgindex = msgtype - RTM_BASE;
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/*
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* msgindex < 0 implies someone tried to register a netlink
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* control code. msgindex >= RTM_NR_MSGTYPES may indicate that
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* the message type has not been added to linux/rtnetlink.h
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*/
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BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
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return msgindex;
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}
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static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
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{
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struct rtnl_link *tab;
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tab = rtnl_msg_handlers[protocol];
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if (tab == NULL || tab[msgindex].doit == NULL)
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tab = rtnl_msg_handlers[PF_UNSPEC];
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return tab ? tab[msgindex].doit : NULL;
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}
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static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
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{
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struct rtnl_link *tab;
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tab = rtnl_msg_handlers[protocol];
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if (tab == NULL || tab[msgindex].dumpit == NULL)
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tab = rtnl_msg_handlers[PF_UNSPEC];
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return tab ? tab[msgindex].dumpit : NULL;
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}
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/**
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* __rtnl_register - Register a rtnetlink message type
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* @protocol: Protocol family or PF_UNSPEC
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* @msgtype: rtnetlink message type
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* @doit: Function pointer called for each request message
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* @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
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*
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* Registers the specified function pointers (at least one of them has
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* to be non-NULL) to be called whenever a request message for the
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* specified protocol family and message type is received.
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*
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* The special protocol family PF_UNSPEC may be used to define fallback
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* function pointers for the case when no entry for the specific protocol
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* family exists.
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*
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* Returns 0 on success or a negative error code.
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*/
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int __rtnl_register(int protocol, int msgtype,
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rtnl_doit_func doit, rtnl_dumpit_func dumpit)
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{
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struct rtnl_link *tab;
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int msgindex;
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BUG_ON(protocol < 0 || protocol >= NPROTO);
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msgindex = rtm_msgindex(msgtype);
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tab = rtnl_msg_handlers[protocol];
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if (tab == NULL) {
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tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
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if (tab == NULL)
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return -ENOBUFS;
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rtnl_msg_handlers[protocol] = tab;
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}
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if (doit)
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tab[msgindex].doit = doit;
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if (dumpit)
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tab[msgindex].dumpit = dumpit;
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return 0;
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}
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EXPORT_SYMBOL_GPL(__rtnl_register);
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/**
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* rtnl_register - Register a rtnetlink message type
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*
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* Identical to __rtnl_register() but panics on failure. This is useful
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* as failure of this function is very unlikely, it can only happen due
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* to lack of memory when allocating the chain to store all message
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* handlers for a protocol. Meant for use in init functions where lack
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* of memory implies no sense in continueing.
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*/
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void rtnl_register(int protocol, int msgtype,
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rtnl_doit_func doit, rtnl_dumpit_func dumpit)
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{
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if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
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panic("Unable to register rtnetlink message handler, "
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"protocol = %d, message type = %d\n",
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protocol, msgtype);
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}
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EXPORT_SYMBOL_GPL(rtnl_register);
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/**
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* rtnl_unregister - Unregister a rtnetlink message type
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* @protocol: Protocol family or PF_UNSPEC
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* @msgtype: rtnetlink message type
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*
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* Returns 0 on success or a negative error code.
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*/
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int rtnl_unregister(int protocol, int msgtype)
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{
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int msgindex;
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BUG_ON(protocol < 0 || protocol >= NPROTO);
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msgindex = rtm_msgindex(msgtype);
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if (rtnl_msg_handlers[protocol] == NULL)
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return -ENOENT;
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rtnl_msg_handlers[protocol][msgindex].doit = NULL;
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rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(rtnl_unregister);
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/**
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* rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
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* @protocol : Protocol family or PF_UNSPEC
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*
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* Identical to calling rtnl_unregster() for all registered message types
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* of a certain protocol family.
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*/
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void rtnl_unregister_all(int protocol)
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{
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BUG_ON(protocol < 0 || protocol >= NPROTO);
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kfree(rtnl_msg_handlers[protocol]);
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rtnl_msg_handlers[protocol] = NULL;
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}
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EXPORT_SYMBOL_GPL(rtnl_unregister_all);
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static LIST_HEAD(link_ops);
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/**
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* __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
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* @ops: struct rtnl_link_ops * to register
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*
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* The caller must hold the rtnl_mutex. This function should be used
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* by drivers that create devices during module initialization. It
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* must be called before registering the devices.
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*
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* Returns 0 on success or a negative error code.
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*/
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int __rtnl_link_register(struct rtnl_link_ops *ops)
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{
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if (!ops->dellink)
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ops->dellink = unregister_netdevice;
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list_add_tail(&ops->list, &link_ops);
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return 0;
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}
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EXPORT_SYMBOL_GPL(__rtnl_link_register);
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/**
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* rtnl_link_register - Register rtnl_link_ops with rtnetlink.
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* @ops: struct rtnl_link_ops * to register
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*
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* Returns 0 on success or a negative error code.
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*/
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int rtnl_link_register(struct rtnl_link_ops *ops)
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{
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int err;
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rtnl_lock();
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err = __rtnl_link_register(ops);
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rtnl_unlock();
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return err;
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}
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EXPORT_SYMBOL_GPL(rtnl_link_register);
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static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
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{
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struct net_device *dev;
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restart:
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for_each_netdev(net, dev) {
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if (dev->rtnl_link_ops == ops) {
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ops->dellink(dev);
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goto restart;
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}
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}
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}
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void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
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{
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rtnl_lock();
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__rtnl_kill_links(net, ops);
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rtnl_unlock();
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}
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EXPORT_SYMBOL_GPL(rtnl_kill_links);
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/**
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* __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
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* @ops: struct rtnl_link_ops * to unregister
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*
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* The caller must hold the rtnl_mutex.
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*/
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void __rtnl_link_unregister(struct rtnl_link_ops *ops)
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{
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struct net *net;
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for_each_net(net) {
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__rtnl_kill_links(net, ops);
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}
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list_del(&ops->list);
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}
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EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
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/**
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* rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
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* @ops: struct rtnl_link_ops * to unregister
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*/
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void rtnl_link_unregister(struct rtnl_link_ops *ops)
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{
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rtnl_lock();
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__rtnl_link_unregister(ops);
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rtnl_unlock();
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}
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EXPORT_SYMBOL_GPL(rtnl_link_unregister);
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static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
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{
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const struct rtnl_link_ops *ops;
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list_for_each_entry(ops, &link_ops, list) {
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if (!strcmp(ops->kind, kind))
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return ops;
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}
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return NULL;
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}
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static size_t rtnl_link_get_size(const struct net_device *dev)
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{
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const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
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size_t size;
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if (!ops)
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return 0;
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size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
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nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
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if (ops->get_size)
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/* IFLA_INFO_DATA + nested data */
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size += nlmsg_total_size(sizeof(struct nlattr)) +
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ops->get_size(dev);
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if (ops->get_xstats_size)
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size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
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return size;
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}
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static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
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{
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const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
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struct nlattr *linkinfo, *data;
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int err = -EMSGSIZE;
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linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
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if (linkinfo == NULL)
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goto out;
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if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
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goto err_cancel_link;
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if (ops->fill_xstats) {
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err = ops->fill_xstats(skb, dev);
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if (err < 0)
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goto err_cancel_link;
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}
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if (ops->fill_info) {
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data = nla_nest_start(skb, IFLA_INFO_DATA);
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if (data == NULL)
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goto err_cancel_link;
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err = ops->fill_info(skb, dev);
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if (err < 0)
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goto err_cancel_data;
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nla_nest_end(skb, data);
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}
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nla_nest_end(skb, linkinfo);
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return 0;
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err_cancel_data:
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nla_nest_cancel(skb, data);
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err_cancel_link:
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nla_nest_cancel(skb, linkinfo);
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out:
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return err;
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}
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static const int rtm_min[RTM_NR_FAMILIES] =
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{
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[RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
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[RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
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[RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
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[RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
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[RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
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[RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
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[RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
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[RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
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[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
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[RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
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};
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static const int rta_max[RTM_NR_FAMILIES] =
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{
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[RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
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[RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
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[RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
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[RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
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[RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
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[RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
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[RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
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[RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
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};
|
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|
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void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
|
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{
|
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struct rtattr *rta;
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int size = RTA_LENGTH(attrlen);
|
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|
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rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
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rta->rta_type = attrtype;
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rta->rta_len = size;
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memcpy(RTA_DATA(rta), data, attrlen);
|
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memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
|
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}
|
|
|
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int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
|
|
{
|
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struct sock *rtnl = net->rtnl;
|
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int err = 0;
|
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|
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NETLINK_CB(skb).dst_group = group;
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if (echo)
|
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atomic_inc(&skb->users);
|
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netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
|
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if (echo)
|
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err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
|
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return err;
|
|
}
|
|
|
|
int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
|
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{
|
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struct sock *rtnl = net->rtnl;
|
|
|
|
return nlmsg_unicast(rtnl, skb, pid);
|
|
}
|
|
|
|
int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
|
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struct nlmsghdr *nlh, gfp_t flags)
|
|
{
|
|
struct sock *rtnl = net->rtnl;
|
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int report = 0;
|
|
|
|
if (nlh)
|
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report = nlmsg_report(nlh);
|
|
|
|
return nlmsg_notify(rtnl, skb, pid, group, report, flags);
|
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}
|
|
|
|
void rtnl_set_sk_err(struct net *net, u32 group, int error)
|
|
{
|
|
struct sock *rtnl = net->rtnl;
|
|
|
|
netlink_set_err(rtnl, 0, group, error);
|
|
}
|
|
|
|
int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
|
|
{
|
|
struct nlattr *mx;
|
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int i, valid = 0;
|
|
|
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mx = nla_nest_start(skb, RTA_METRICS);
|
|
if (mx == NULL)
|
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return -ENOBUFS;
|
|
|
|
for (i = 0; i < RTAX_MAX; i++) {
|
|
if (metrics[i]) {
|
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valid++;
|
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NLA_PUT_U32(skb, i+1, metrics[i]);
|
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}
|
|
}
|
|
|
|
if (!valid) {
|
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nla_nest_cancel(skb, mx);
|
|
return 0;
|
|
}
|
|
|
|
return nla_nest_end(skb, mx);
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, mx);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
|
|
u32 ts, u32 tsage, long expires, u32 error)
|
|
{
|
|
struct rta_cacheinfo ci = {
|
|
.rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
|
|
.rta_used = dst->__use,
|
|
.rta_clntref = atomic_read(&(dst->__refcnt)),
|
|
.rta_error = error,
|
|
.rta_id = id,
|
|
.rta_ts = ts,
|
|
.rta_tsage = tsage,
|
|
};
|
|
|
|
if (expires)
|
|
ci.rta_expires = jiffies_to_clock_t(expires);
|
|
|
|
return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
|
|
|
|
static void set_operstate(struct net_device *dev, unsigned char transition)
|
|
{
|
|
unsigned char operstate = dev->operstate;
|
|
|
|
switch(transition) {
|
|
case IF_OPER_UP:
|
|
if ((operstate == IF_OPER_DORMANT ||
|
|
operstate == IF_OPER_UNKNOWN) &&
|
|
!netif_dormant(dev))
|
|
operstate = IF_OPER_UP;
|
|
break;
|
|
|
|
case IF_OPER_DORMANT:
|
|
if (operstate == IF_OPER_UP ||
|
|
operstate == IF_OPER_UNKNOWN)
|
|
operstate = IF_OPER_DORMANT;
|
|
break;
|
|
}
|
|
|
|
if (dev->operstate != operstate) {
|
|
write_lock_bh(&dev_base_lock);
|
|
dev->operstate = operstate;
|
|
write_unlock_bh(&dev_base_lock);
|
|
netdev_state_change(dev);
|
|
}
|
|
}
|
|
|
|
static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
|
|
struct net_device_stats *b)
|
|
{
|
|
a->rx_packets = b->rx_packets;
|
|
a->tx_packets = b->tx_packets;
|
|
a->rx_bytes = b->rx_bytes;
|
|
a->tx_bytes = b->tx_bytes;
|
|
a->rx_errors = b->rx_errors;
|
|
a->tx_errors = b->tx_errors;
|
|
a->rx_dropped = b->rx_dropped;
|
|
a->tx_dropped = b->tx_dropped;
|
|
|
|
a->multicast = b->multicast;
|
|
a->collisions = b->collisions;
|
|
|
|
a->rx_length_errors = b->rx_length_errors;
|
|
a->rx_over_errors = b->rx_over_errors;
|
|
a->rx_crc_errors = b->rx_crc_errors;
|
|
a->rx_frame_errors = b->rx_frame_errors;
|
|
a->rx_fifo_errors = b->rx_fifo_errors;
|
|
a->rx_missed_errors = b->rx_missed_errors;
|
|
|
|
a->tx_aborted_errors = b->tx_aborted_errors;
|
|
a->tx_carrier_errors = b->tx_carrier_errors;
|
|
a->tx_fifo_errors = b->tx_fifo_errors;
|
|
a->tx_heartbeat_errors = b->tx_heartbeat_errors;
|
|
a->tx_window_errors = b->tx_window_errors;
|
|
|
|
a->rx_compressed = b->rx_compressed;
|
|
a->tx_compressed = b->tx_compressed;
|
|
};
|
|
|
|
static inline size_t if_nlmsg_size(const struct net_device *dev)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
|
|
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
|
|
+ nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
|
|
+ nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
|
|
+ nla_total_size(sizeof(struct rtnl_link_ifmap))
|
|
+ nla_total_size(sizeof(struct rtnl_link_stats))
|
|
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
|
|
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
|
|
+ nla_total_size(4) /* IFLA_TXQLEN */
|
|
+ nla_total_size(4) /* IFLA_WEIGHT */
|
|
+ nla_total_size(4) /* IFLA_MTU */
|
|
+ nla_total_size(4) /* IFLA_LINK */
|
|
+ nla_total_size(4) /* IFLA_MASTER */
|
|
+ nla_total_size(1) /* IFLA_OPERSTATE */
|
|
+ nla_total_size(1) /* IFLA_LINKMODE */
|
|
+ rtnl_link_get_size(dev); /* IFLA_LINKINFO */
|
|
}
|
|
|
|
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
|
|
int type, u32 pid, u32 seq, u32 change,
|
|
unsigned int flags)
|
|
{
|
|
struct netdev_queue *txq;
|
|
struct ifinfomsg *ifm;
|
|
struct nlmsghdr *nlh;
|
|
struct net_device_stats *stats;
|
|
struct nlattr *attr;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
ifm->ifi_family = AF_UNSPEC;
|
|
ifm->__ifi_pad = 0;
|
|
ifm->ifi_type = dev->type;
|
|
ifm->ifi_index = dev->ifindex;
|
|
ifm->ifi_flags = dev_get_flags(dev);
|
|
ifm->ifi_change = change;
|
|
|
|
NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
|
|
NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
|
|
NLA_PUT_U8(skb, IFLA_OPERSTATE,
|
|
netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
|
|
NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
|
|
NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
|
|
|
|
if (dev->ifindex != dev->iflink)
|
|
NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
|
|
|
|
if (dev->master)
|
|
NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
|
|
|
|
txq = netdev_get_tx_queue(dev, 0);
|
|
if (txq->qdisc_sleeping)
|
|
NLA_PUT_STRING(skb, IFLA_QDISC, txq->qdisc_sleeping->ops->id);
|
|
|
|
if (dev->ifalias)
|
|
NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
|
|
|
|
if (1) {
|
|
struct rtnl_link_ifmap map = {
|
|
.mem_start = dev->mem_start,
|
|
.mem_end = dev->mem_end,
|
|
.base_addr = dev->base_addr,
|
|
.irq = dev->irq,
|
|
.dma = dev->dma,
|
|
.port = dev->if_port,
|
|
};
|
|
NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
|
|
}
|
|
|
|
if (dev->addr_len) {
|
|
NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
|
|
NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
|
|
}
|
|
|
|
attr = nla_reserve(skb, IFLA_STATS,
|
|
sizeof(struct rtnl_link_stats));
|
|
if (attr == NULL)
|
|
goto nla_put_failure;
|
|
|
|
stats = dev->get_stats(dev);
|
|
copy_rtnl_link_stats(nla_data(attr), stats);
|
|
|
|
if (dev->rtnl_link_ops) {
|
|
if (rtnl_link_fill(skb, dev) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
int idx;
|
|
int s_idx = cb->args[0];
|
|
struct net_device *dev;
|
|
|
|
idx = 0;
|
|
for_each_netdev(net, dev) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
|
|
break;
|
|
cont:
|
|
idx++;
|
|
}
|
|
cb->args[0] = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
const struct nla_policy ifla_policy[IFLA_MAX+1] = {
|
|
[IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
|
|
[IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
|
|
[IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
|
|
[IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
|
|
[IFLA_MTU] = { .type = NLA_U32 },
|
|
[IFLA_LINK] = { .type = NLA_U32 },
|
|
[IFLA_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_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
|
|
};
|
|
|
|
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
|
|
[IFLA_INFO_KIND] = { .type = NLA_STRING },
|
|
[IFLA_INFO_DATA] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static struct net *get_net_ns_by_pid(pid_t pid)
|
|
{
|
|
struct task_struct *tsk;
|
|
struct net *net;
|
|
|
|
/* Lookup the network namespace */
|
|
net = ERR_PTR(-ESRCH);
|
|
rcu_read_lock();
|
|
tsk = find_task_by_vpid(pid);
|
|
if (tsk) {
|
|
struct nsproxy *nsproxy;
|
|
nsproxy = task_nsproxy(tsk);
|
|
if (nsproxy)
|
|
net = get_net(nsproxy->net_ns);
|
|
}
|
|
rcu_read_unlock();
|
|
return net;
|
|
}
|
|
|
|
static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
|
|
{
|
|
if (dev) {
|
|
if (tb[IFLA_ADDRESS] &&
|
|
nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
|
|
return -EINVAL;
|
|
|
|
if (tb[IFLA_BROADCAST] &&
|
|
nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
|
|
struct nlattr **tb, char *ifname, int modified)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int send_addr_notify = 0;
|
|
int err;
|
|
|
|
if (tb[IFLA_NET_NS_PID]) {
|
|
struct net *net;
|
|
net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
|
|
if (IS_ERR(net)) {
|
|
err = PTR_ERR(net);
|
|
goto errout;
|
|
}
|
|
err = dev_change_net_namespace(dev, net, ifname);
|
|
put_net(net);
|
|
if (err)
|
|
goto errout;
|
|
modified = 1;
|
|
}
|
|
|
|
if (tb[IFLA_MAP]) {
|
|
struct rtnl_link_ifmap *u_map;
|
|
struct ifmap k_map;
|
|
|
|
if (!ops->ndo_set_config) {
|
|
err = -EOPNOTSUPP;
|
|
goto errout;
|
|
}
|
|
|
|
if (!netif_device_present(dev)) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
u_map = nla_data(tb[IFLA_MAP]);
|
|
k_map.mem_start = (unsigned long) u_map->mem_start;
|
|
k_map.mem_end = (unsigned long) u_map->mem_end;
|
|
k_map.base_addr = (unsigned short) u_map->base_addr;
|
|
k_map.irq = (unsigned char) u_map->irq;
|
|
k_map.dma = (unsigned char) u_map->dma;
|
|
k_map.port = (unsigned char) u_map->port;
|
|
|
|
err = ops->ndo_set_config(dev, &k_map);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
modified = 1;
|
|
}
|
|
|
|
if (tb[IFLA_ADDRESS]) {
|
|
struct sockaddr *sa;
|
|
int len;
|
|
|
|
if (!ops->ndo_set_mac_address) {
|
|
err = -EOPNOTSUPP;
|
|
goto errout;
|
|
}
|
|
|
|
if (!netif_device_present(dev)) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
len = sizeof(sa_family_t) + dev->addr_len;
|
|
sa = kmalloc(len, GFP_KERNEL);
|
|
if (!sa) {
|
|
err = -ENOMEM;
|
|
goto errout;
|
|
}
|
|
sa->sa_family = dev->type;
|
|
memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
|
|
dev->addr_len);
|
|
err = ops->ndo_set_mac_address(dev, sa);
|
|
kfree(sa);
|
|
if (err)
|
|
goto errout;
|
|
send_addr_notify = 1;
|
|
modified = 1;
|
|
}
|
|
|
|
if (tb[IFLA_MTU]) {
|
|
err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
|
|
if (err < 0)
|
|
goto errout;
|
|
modified = 1;
|
|
}
|
|
|
|
/*
|
|
* Interface selected by interface index but interface
|
|
* name provided implies that a name change has been
|
|
* requested.
|
|
*/
|
|
if (ifm->ifi_index > 0 && ifname[0]) {
|
|
err = dev_change_name(dev, ifname);
|
|
if (err < 0)
|
|
goto errout;
|
|
modified = 1;
|
|
}
|
|
|
|
if (tb[IFLA_IFALIAS]) {
|
|
err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
|
|
nla_len(tb[IFLA_IFALIAS]));
|
|
if (err < 0)
|
|
goto errout;
|
|
modified = 1;
|
|
}
|
|
|
|
if (tb[IFLA_BROADCAST]) {
|
|
nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
|
|
send_addr_notify = 1;
|
|
}
|
|
|
|
if (ifm->ifi_flags || ifm->ifi_change) {
|
|
unsigned int flags = ifm->ifi_flags;
|
|
|
|
/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
|
|
if (ifm->ifi_change)
|
|
flags = (flags & ifm->ifi_change) |
|
|
(dev->flags & ~ifm->ifi_change);
|
|
err = dev_change_flags(dev, flags);
|
|
if (err < 0)
|
|
goto errout;
|
|
}
|
|
|
|
if (tb[IFLA_TXQLEN])
|
|
dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
|
|
|
|
if (tb[IFLA_OPERSTATE])
|
|
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
|
|
|
|
if (tb[IFLA_LINKMODE]) {
|
|
write_lock_bh(&dev_base_lock);
|
|
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
|
|
write_unlock_bh(&dev_base_lock);
|
|
}
|
|
|
|
err = 0;
|
|
|
|
errout:
|
|
if (err < 0 && modified && net_ratelimit())
|
|
printk(KERN_WARNING "A link change request failed with "
|
|
"some changes comitted already. Interface %s may "
|
|
"have been left with an inconsistent configuration, "
|
|
"please check.\n", dev->name);
|
|
|
|
if (send_addr_notify)
|
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
|
|
return err;
|
|
}
|
|
|
|
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct ifinfomsg *ifm;
|
|
struct net_device *dev;
|
|
int err;
|
|
struct nlattr *tb[IFLA_MAX+1];
|
|
char ifname[IFNAMSIZ];
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
if (tb[IFLA_IFNAME])
|
|
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
|
|
else
|
|
ifname[0] = '\0';
|
|
|
|
err = -EINVAL;
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->ifi_index > 0)
|
|
dev = dev_get_by_index(net, ifm->ifi_index);
|
|
else if (tb[IFLA_IFNAME])
|
|
dev = dev_get_by_name(net, ifname);
|
|
else
|
|
goto errout;
|
|
|
|
if (dev == NULL) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
if ((err = validate_linkmsg(dev, tb)) < 0)
|
|
goto errout_dev;
|
|
|
|
err = do_setlink(dev, ifm, tb, ifname, 0);
|
|
errout_dev:
|
|
dev_put(dev);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
const struct rtnl_link_ops *ops;
|
|
struct net_device *dev;
|
|
struct ifinfomsg *ifm;
|
|
char ifname[IFNAMSIZ];
|
|
struct nlattr *tb[IFLA_MAX+1];
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[IFLA_IFNAME])
|
|
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->ifi_index > 0)
|
|
dev = __dev_get_by_index(net, ifm->ifi_index);
|
|
else if (tb[IFLA_IFNAME])
|
|
dev = __dev_get_by_name(net, ifname);
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
ops = dev->rtnl_link_ops;
|
|
if (!ops)
|
|
return -EOPNOTSUPP;
|
|
|
|
ops->dellink(dev);
|
|
return 0;
|
|
}
|
|
|
|
struct net_device *rtnl_create_link(struct net *net, char *ifname,
|
|
const struct rtnl_link_ops *ops, struct nlattr *tb[])
|
|
{
|
|
int err;
|
|
struct net_device *dev;
|
|
|
|
err = -ENOMEM;
|
|
dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
|
|
if (!dev)
|
|
goto err;
|
|
|
|
if (strchr(dev->name, '%')) {
|
|
err = dev_alloc_name(dev, dev->name);
|
|
if (err < 0)
|
|
goto err_free;
|
|
}
|
|
|
|
dev_net_set(dev, net);
|
|
dev->rtnl_link_ops = ops;
|
|
|
|
if (tb[IFLA_MTU])
|
|
dev->mtu = nla_get_u32(tb[IFLA_MTU]);
|
|
if (tb[IFLA_ADDRESS])
|
|
memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
|
|
nla_len(tb[IFLA_ADDRESS]));
|
|
if (tb[IFLA_BROADCAST])
|
|
memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
|
|
nla_len(tb[IFLA_BROADCAST]));
|
|
if (tb[IFLA_TXQLEN])
|
|
dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
|
|
if (tb[IFLA_OPERSTATE])
|
|
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
|
|
if (tb[IFLA_LINKMODE])
|
|
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
|
|
|
|
return dev;
|
|
|
|
err_free:
|
|
free_netdev(dev);
|
|
err:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
const struct rtnl_link_ops *ops;
|
|
struct net_device *dev;
|
|
struct ifinfomsg *ifm;
|
|
char kind[MODULE_NAME_LEN];
|
|
char ifname[IFNAMSIZ];
|
|
struct nlattr *tb[IFLA_MAX+1];
|
|
struct nlattr *linkinfo[IFLA_INFO_MAX+1];
|
|
int err;
|
|
|
|
#ifdef CONFIG_MODULES
|
|
replay:
|
|
#endif
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[IFLA_IFNAME])
|
|
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
|
|
else
|
|
ifname[0] = '\0';
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->ifi_index > 0)
|
|
dev = __dev_get_by_index(net, ifm->ifi_index);
|
|
else if (ifname[0])
|
|
dev = __dev_get_by_name(net, ifname);
|
|
else
|
|
dev = NULL;
|
|
|
|
if ((err = validate_linkmsg(dev, tb)) < 0)
|
|
return err;
|
|
|
|
if (tb[IFLA_LINKINFO]) {
|
|
err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
|
|
tb[IFLA_LINKINFO], ifla_info_policy);
|
|
if (err < 0)
|
|
return err;
|
|
} else
|
|
memset(linkinfo, 0, sizeof(linkinfo));
|
|
|
|
if (linkinfo[IFLA_INFO_KIND]) {
|
|
nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
|
|
ops = rtnl_link_ops_get(kind);
|
|
} else {
|
|
kind[0] = '\0';
|
|
ops = NULL;
|
|
}
|
|
|
|
if (1) {
|
|
struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
|
|
|
|
if (ops) {
|
|
if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
|
|
err = nla_parse_nested(attr, ops->maxtype,
|
|
linkinfo[IFLA_INFO_DATA],
|
|
ops->policy);
|
|
if (err < 0)
|
|
return err;
|
|
data = attr;
|
|
}
|
|
if (ops->validate) {
|
|
err = ops->validate(tb, data);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (dev) {
|
|
int modified = 0;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL)
|
|
return -EEXIST;
|
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (linkinfo[IFLA_INFO_DATA]) {
|
|
if (!ops || ops != dev->rtnl_link_ops ||
|
|
!ops->changelink)
|
|
return -EOPNOTSUPP;
|
|
|
|
err = ops->changelink(dev, tb, data);
|
|
if (err < 0)
|
|
return err;
|
|
modified = 1;
|
|
}
|
|
|
|
return do_setlink(dev, ifm, tb, ifname, modified);
|
|
}
|
|
|
|
if (!(nlh->nlmsg_flags & NLM_F_CREATE))
|
|
return -ENODEV;
|
|
|
|
if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
|
|
return -EOPNOTSUPP;
|
|
if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!ops) {
|
|
#ifdef CONFIG_MODULES
|
|
if (kind[0]) {
|
|
__rtnl_unlock();
|
|
request_module("rtnl-link-%s", kind);
|
|
rtnl_lock();
|
|
ops = rtnl_link_ops_get(kind);
|
|
if (ops)
|
|
goto replay;
|
|
}
|
|
#endif
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (!ifname[0])
|
|
snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
|
|
|
|
dev = rtnl_create_link(net, ifname, ops, tb);
|
|
|
|
if (IS_ERR(dev))
|
|
err = PTR_ERR(dev);
|
|
else if (ops->newlink)
|
|
err = ops->newlink(dev, tb, data);
|
|
else
|
|
err = register_netdevice(dev);
|
|
|
|
if (err < 0 && !IS_ERR(dev))
|
|
free_netdev(dev);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct ifinfomsg *ifm;
|
|
struct nlattr *tb[IFLA_MAX+1];
|
|
struct net_device *dev = NULL;
|
|
struct sk_buff *nskb;
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->ifi_index > 0) {
|
|
dev = dev_get_by_index(net, ifm->ifi_index);
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
} else
|
|
return -EINVAL;
|
|
|
|
nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
|
|
if (nskb == NULL) {
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
|
|
nlh->nlmsg_seq, 0, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in if_nlmsg_size */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(nskb);
|
|
goto errout;
|
|
}
|
|
err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
|
|
errout:
|
|
dev_put(dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int idx;
|
|
int s_idx = cb->family;
|
|
|
|
if (s_idx == 0)
|
|
s_idx = 1;
|
|
for (idx=1; idx<NPROTO; idx++) {
|
|
int type = cb->nlh->nlmsg_type-RTM_BASE;
|
|
if (idx < s_idx || idx == PF_PACKET)
|
|
continue;
|
|
if (rtnl_msg_handlers[idx] == NULL ||
|
|
rtnl_msg_handlers[idx][type].dumpit == NULL)
|
|
continue;
|
|
if (idx > s_idx)
|
|
memset(&cb->args[0], 0, sizeof(cb->args));
|
|
if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
|
|
break;
|
|
}
|
|
cb->family = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in if_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
|
|
}
|
|
|
|
/* Protected by RTNL sempahore. */
|
|
static struct rtattr **rta_buf;
|
|
static int rtattr_max;
|
|
|
|
/* Process one rtnetlink message. */
|
|
|
|
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
rtnl_doit_func doit;
|
|
int sz_idx, kind;
|
|
int min_len;
|
|
int family;
|
|
int type;
|
|
int err;
|
|
|
|
type = nlh->nlmsg_type;
|
|
if (type > RTM_MAX)
|
|
return -EOPNOTSUPP;
|
|
|
|
type -= RTM_BASE;
|
|
|
|
/* All the messages must have at least 1 byte length */
|
|
if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
|
|
return 0;
|
|
|
|
family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
|
|
if (family >= NPROTO)
|
|
return -EAFNOSUPPORT;
|
|
|
|
sz_idx = type>>2;
|
|
kind = type&3;
|
|
|
|
if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
|
|
struct sock *rtnl;
|
|
rtnl_dumpit_func dumpit;
|
|
|
|
dumpit = rtnl_get_dumpit(family, type);
|
|
if (dumpit == NULL)
|
|
return -EOPNOTSUPP;
|
|
|
|
__rtnl_unlock();
|
|
rtnl = net->rtnl;
|
|
err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
|
|
rtnl_lock();
|
|
return err;
|
|
}
|
|
|
|
memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
|
|
|
|
min_len = rtm_min[sz_idx];
|
|
if (nlh->nlmsg_len < min_len)
|
|
return -EINVAL;
|
|
|
|
if (nlh->nlmsg_len > min_len) {
|
|
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
|
|
struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
|
|
|
|
while (RTA_OK(attr, attrlen)) {
|
|
unsigned flavor = attr->rta_type;
|
|
if (flavor) {
|
|
if (flavor > rta_max[sz_idx])
|
|
return -EINVAL;
|
|
rta_buf[flavor-1] = attr;
|
|
}
|
|
attr = RTA_NEXT(attr, attrlen);
|
|
}
|
|
}
|
|
|
|
doit = rtnl_get_doit(family, type);
|
|
if (doit == NULL)
|
|
return -EOPNOTSUPP;
|
|
|
|
return doit(skb, nlh, (void *)&rta_buf[0]);
|
|
}
|
|
|
|
static void rtnetlink_rcv(struct sk_buff *skb)
|
|
{
|
|
rtnl_lock();
|
|
netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
|
|
switch (event) {
|
|
case NETDEV_UNREGISTER:
|
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
|
|
break;
|
|
case NETDEV_REGISTER:
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
|
|
break;
|
|
case NETDEV_UP:
|
|
case NETDEV_DOWN:
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
|
|
break;
|
|
case NETDEV_CHANGE:
|
|
case NETDEV_GOING_DOWN:
|
|
break;
|
|
default:
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block rtnetlink_dev_notifier = {
|
|
.notifier_call = rtnetlink_event,
|
|
};
|
|
|
|
|
|
static int rtnetlink_net_init(struct net *net)
|
|
{
|
|
struct sock *sk;
|
|
sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
|
|
rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
|
|
if (!sk)
|
|
return -ENOMEM;
|
|
net->rtnl = sk;
|
|
return 0;
|
|
}
|
|
|
|
static void rtnetlink_net_exit(struct net *net)
|
|
{
|
|
netlink_kernel_release(net->rtnl);
|
|
net->rtnl = NULL;
|
|
}
|
|
|
|
static struct pernet_operations rtnetlink_net_ops = {
|
|
.init = rtnetlink_net_init,
|
|
.exit = rtnetlink_net_exit,
|
|
};
|
|
|
|
void __init rtnetlink_init(void)
|
|
{
|
|
int i;
|
|
|
|
rtattr_max = 0;
|
|
for (i = 0; i < ARRAY_SIZE(rta_max); i++)
|
|
if (rta_max[i] > rtattr_max)
|
|
rtattr_max = rta_max[i];
|
|
rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
|
|
if (!rta_buf)
|
|
panic("rtnetlink_init: cannot allocate rta_buf\n");
|
|
|
|
if (register_pernet_subsys(&rtnetlink_net_ops))
|
|
panic("rtnetlink_init: cannot initialize rtnetlink\n");
|
|
|
|
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
|
|
register_netdevice_notifier(&rtnetlink_dev_notifier);
|
|
|
|
rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
|
|
rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
|
|
rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
|
|
|
|
rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
|
|
rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
|
|
}
|
|
|
|
EXPORT_SYMBOL(__rta_fill);
|
|
EXPORT_SYMBOL(rtnetlink_put_metrics);
|
|
EXPORT_SYMBOL(rtnl_lock);
|
|
EXPORT_SYMBOL(rtnl_trylock);
|
|
EXPORT_SYMBOL(rtnl_unlock);
|
|
EXPORT_SYMBOL(rtnl_is_locked);
|
|
EXPORT_SYMBOL(rtnl_unicast);
|
|
EXPORT_SYMBOL(rtnl_notify);
|
|
EXPORT_SYMBOL(rtnl_set_sk_err);
|
|
EXPORT_SYMBOL(rtnl_create_link);
|
|
EXPORT_SYMBOL(ifla_policy);
|