mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:46:42 +07:00
0115e8e30d
I noticed extra one second delay in device dismantle, tracked down to a call to dst_dev_event() while some call_rcu() are still in RCU queues. These call_rcu() were posted by rt_free(struct rtable *rt) calls. We then wait a little (but one second) in netdev_wait_allrefs() before kicking again NETDEV_UNREGISTER. As the call_rcu() are now completed, dst_dev_event() can do the needed device swap on busy dst. To solve this problem, add a new NETDEV_UNREGISTER_FINAL, called after a rcu_barrier(), but outside of RTNL lock. Use NETDEV_UNREGISTER_FINAL with care ! Change dst_dev_event() handler to react to NETDEV_UNREGISTER_FINAL Also remove NETDEV_UNREGISTER_BATCH, as its not used anymore after IP cache removal. With help from Gao feng Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <therbert@google.com> Cc: Mahesh Bandewar <maheshb@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1818 lines
43 KiB
C
1818 lines
43 KiB
C
/*
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* NET3 IP device support routines.
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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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* Derived from the IP parts of dev.c 1.0.19
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Mark Evans, <evansmp@uhura.aston.ac.uk>
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*
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* Additional Authors:
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Changes:
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* Alexey Kuznetsov: pa_* fields are replaced with ifaddr
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* lists.
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* Cyrus Durgin: updated for kmod
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* Matthias Andree: in devinet_ioctl, compare label and
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* address (4.4BSD alias style support),
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* fall back to comparing just the label
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* if no match found.
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*/
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#include <asm/uaccess.h>
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#include <linux/bitops.h>
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_addr.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/notifier.h>
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#include <linux/inetdevice.h>
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#include <linux/igmp.h>
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#include <linux/slab.h>
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#include <linux/hash.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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#endif
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#include <linux/kmod.h>
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#include <net/arp.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/ip_fib.h>
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#include <net/rtnetlink.h>
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#include <net/net_namespace.h>
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#include "fib_lookup.h"
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static struct ipv4_devconf ipv4_devconf = {
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.data = {
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[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
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},
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};
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static struct ipv4_devconf ipv4_devconf_dflt = {
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.data = {
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[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
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[IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
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},
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};
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#define IPV4_DEVCONF_DFLT(net, attr) \
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IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
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static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
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[IFA_LOCAL] = { .type = NLA_U32 },
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[IFA_ADDRESS] = { .type = NLA_U32 },
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[IFA_BROADCAST] = { .type = NLA_U32 },
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[IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
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};
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#define IN4_ADDR_HSIZE_SHIFT 8
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#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
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static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
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static DEFINE_SPINLOCK(inet_addr_hash_lock);
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static u32 inet_addr_hash(struct net *net, __be32 addr)
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{
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u32 val = (__force u32) addr ^ net_hash_mix(net);
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return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
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}
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static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
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{
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u32 hash = inet_addr_hash(net, ifa->ifa_local);
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spin_lock(&inet_addr_hash_lock);
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hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
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spin_unlock(&inet_addr_hash_lock);
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}
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static void inet_hash_remove(struct in_ifaddr *ifa)
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{
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spin_lock(&inet_addr_hash_lock);
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hlist_del_init_rcu(&ifa->hash);
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spin_unlock(&inet_addr_hash_lock);
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}
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/**
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* __ip_dev_find - find the first device with a given source address.
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* @net: the net namespace
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* @addr: the source address
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* @devref: if true, take a reference on the found device
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*
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* If a caller uses devref=false, it should be protected by RCU, or RTNL
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*/
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struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
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{
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u32 hash = inet_addr_hash(net, addr);
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struct net_device *result = NULL;
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struct in_ifaddr *ifa;
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struct hlist_node *node;
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rcu_read_lock();
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hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) {
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if (ifa->ifa_local == addr) {
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struct net_device *dev = ifa->ifa_dev->dev;
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if (!net_eq(dev_net(dev), net))
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continue;
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result = dev;
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break;
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}
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}
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if (!result) {
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struct flowi4 fl4 = { .daddr = addr };
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struct fib_result res = { 0 };
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struct fib_table *local;
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/* Fallback to FIB local table so that communication
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* over loopback subnets work.
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*/
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local = fib_get_table(net, RT_TABLE_LOCAL);
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if (local &&
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!fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
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res.type == RTN_LOCAL)
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result = FIB_RES_DEV(res);
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}
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if (result && devref)
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dev_hold(result);
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rcu_read_unlock();
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return result;
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}
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EXPORT_SYMBOL(__ip_dev_find);
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static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
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static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
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static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
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int destroy);
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#ifdef CONFIG_SYSCTL
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static void devinet_sysctl_register(struct in_device *idev);
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static void devinet_sysctl_unregister(struct in_device *idev);
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#else
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static void devinet_sysctl_register(struct in_device *idev)
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{
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}
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static void devinet_sysctl_unregister(struct in_device *idev)
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{
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}
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#endif
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/* Locks all the inet devices. */
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static struct in_ifaddr *inet_alloc_ifa(void)
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{
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return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
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}
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static void inet_rcu_free_ifa(struct rcu_head *head)
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{
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struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
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if (ifa->ifa_dev)
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in_dev_put(ifa->ifa_dev);
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kfree(ifa);
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}
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static void inet_free_ifa(struct in_ifaddr *ifa)
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{
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call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
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}
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void in_dev_finish_destroy(struct in_device *idev)
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{
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struct net_device *dev = idev->dev;
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WARN_ON(idev->ifa_list);
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WARN_ON(idev->mc_list);
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#ifdef NET_REFCNT_DEBUG
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pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
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#endif
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dev_put(dev);
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if (!idev->dead)
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pr_err("Freeing alive in_device %p\n", idev);
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else
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kfree(idev);
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}
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EXPORT_SYMBOL(in_dev_finish_destroy);
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static struct in_device *inetdev_init(struct net_device *dev)
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{
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struct in_device *in_dev;
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ASSERT_RTNL();
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in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
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if (!in_dev)
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goto out;
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memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
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sizeof(in_dev->cnf));
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in_dev->cnf.sysctl = NULL;
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in_dev->dev = dev;
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in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
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if (!in_dev->arp_parms)
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goto out_kfree;
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if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
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dev_disable_lro(dev);
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/* Reference in_dev->dev */
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dev_hold(dev);
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/* Account for reference dev->ip_ptr (below) */
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in_dev_hold(in_dev);
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devinet_sysctl_register(in_dev);
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ip_mc_init_dev(in_dev);
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if (dev->flags & IFF_UP)
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ip_mc_up(in_dev);
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/* we can receive as soon as ip_ptr is set -- do this last */
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rcu_assign_pointer(dev->ip_ptr, in_dev);
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out:
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return in_dev;
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out_kfree:
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kfree(in_dev);
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in_dev = NULL;
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goto out;
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}
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static void in_dev_rcu_put(struct rcu_head *head)
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{
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struct in_device *idev = container_of(head, struct in_device, rcu_head);
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in_dev_put(idev);
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}
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static void inetdev_destroy(struct in_device *in_dev)
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{
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struct in_ifaddr *ifa;
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struct net_device *dev;
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ASSERT_RTNL();
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dev = in_dev->dev;
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in_dev->dead = 1;
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ip_mc_destroy_dev(in_dev);
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while ((ifa = in_dev->ifa_list) != NULL) {
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inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
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inet_free_ifa(ifa);
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}
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RCU_INIT_POINTER(dev->ip_ptr, NULL);
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devinet_sysctl_unregister(in_dev);
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neigh_parms_release(&arp_tbl, in_dev->arp_parms);
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arp_ifdown(dev);
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call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
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}
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int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
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{
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rcu_read_lock();
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for_primary_ifa(in_dev) {
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if (inet_ifa_match(a, ifa)) {
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if (!b || inet_ifa_match(b, ifa)) {
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rcu_read_unlock();
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return 1;
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}
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}
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} endfor_ifa(in_dev);
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rcu_read_unlock();
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return 0;
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}
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static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
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int destroy, struct nlmsghdr *nlh, u32 pid)
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{
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struct in_ifaddr *promote = NULL;
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struct in_ifaddr *ifa, *ifa1 = *ifap;
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struct in_ifaddr *last_prim = in_dev->ifa_list;
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struct in_ifaddr *prev_prom = NULL;
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int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
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ASSERT_RTNL();
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/* 1. Deleting primary ifaddr forces deletion all secondaries
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* unless alias promotion is set
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**/
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if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
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struct in_ifaddr **ifap1 = &ifa1->ifa_next;
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while ((ifa = *ifap1) != NULL) {
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if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
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ifa1->ifa_scope <= ifa->ifa_scope)
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last_prim = ifa;
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if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
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ifa1->ifa_mask != ifa->ifa_mask ||
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!inet_ifa_match(ifa1->ifa_address, ifa)) {
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ifap1 = &ifa->ifa_next;
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prev_prom = ifa;
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continue;
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}
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if (!do_promote) {
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inet_hash_remove(ifa);
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*ifap1 = ifa->ifa_next;
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rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain,
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NETDEV_DOWN, ifa);
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inet_free_ifa(ifa);
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} else {
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promote = ifa;
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break;
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}
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}
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}
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/* On promotion all secondaries from subnet are changing
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* the primary IP, we must remove all their routes silently
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* and later to add them back with new prefsrc. Do this
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* while all addresses are on the device list.
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*/
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for (ifa = promote; ifa; ifa = ifa->ifa_next) {
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if (ifa1->ifa_mask == ifa->ifa_mask &&
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inet_ifa_match(ifa1->ifa_address, ifa))
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fib_del_ifaddr(ifa, ifa1);
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}
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/* 2. Unlink it */
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*ifap = ifa1->ifa_next;
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inet_hash_remove(ifa1);
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/* 3. Announce address deletion */
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/* Send message first, then call notifier.
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At first sight, FIB update triggered by notifier
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will refer to already deleted ifaddr, that could confuse
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netlink listeners. It is not true: look, gated sees
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that route deleted and if it still thinks that ifaddr
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is valid, it will try to restore deleted routes... Grr.
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So that, this order is correct.
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*/
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rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
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if (promote) {
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struct in_ifaddr *next_sec = promote->ifa_next;
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if (prev_prom) {
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prev_prom->ifa_next = promote->ifa_next;
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promote->ifa_next = last_prim->ifa_next;
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last_prim->ifa_next = promote;
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}
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promote->ifa_flags &= ~IFA_F_SECONDARY;
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rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain,
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NETDEV_UP, promote);
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for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
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if (ifa1->ifa_mask != ifa->ifa_mask ||
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!inet_ifa_match(ifa1->ifa_address, ifa))
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continue;
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fib_add_ifaddr(ifa);
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}
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}
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if (destroy)
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inet_free_ifa(ifa1);
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}
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|
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static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
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int destroy)
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{
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__inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
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}
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|
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static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
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u32 pid)
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{
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struct in_device *in_dev = ifa->ifa_dev;
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struct in_ifaddr *ifa1, **ifap, **last_primary;
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ASSERT_RTNL();
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|
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if (!ifa->ifa_local) {
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inet_free_ifa(ifa);
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return 0;
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}
|
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|
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ifa->ifa_flags &= ~IFA_F_SECONDARY;
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last_primary = &in_dev->ifa_list;
|
|
|
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for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
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ifap = &ifa1->ifa_next) {
|
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if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
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ifa->ifa_scope <= ifa1->ifa_scope)
|
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last_primary = &ifa1->ifa_next;
|
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if (ifa1->ifa_mask == ifa->ifa_mask &&
|
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inet_ifa_match(ifa1->ifa_address, ifa)) {
|
|
if (ifa1->ifa_local == ifa->ifa_local) {
|
|
inet_free_ifa(ifa);
|
|
return -EEXIST;
|
|
}
|
|
if (ifa1->ifa_scope != ifa->ifa_scope) {
|
|
inet_free_ifa(ifa);
|
|
return -EINVAL;
|
|
}
|
|
ifa->ifa_flags |= IFA_F_SECONDARY;
|
|
}
|
|
}
|
|
|
|
if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
|
|
net_srandom(ifa->ifa_local);
|
|
ifap = last_primary;
|
|
}
|
|
|
|
ifa->ifa_next = *ifap;
|
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*ifap = ifa;
|
|
|
|
inet_hash_insert(dev_net(in_dev->dev), ifa);
|
|
|
|
/* Send message first, then call notifier.
|
|
Notifier will trigger FIB update, so that
|
|
listeners of netlink will know about new ifaddr */
|
|
rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
|
|
blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int inet_insert_ifa(struct in_ifaddr *ifa)
|
|
{
|
|
return __inet_insert_ifa(ifa, NULL, 0);
|
|
}
|
|
|
|
static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
|
|
{
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!in_dev) {
|
|
inet_free_ifa(ifa);
|
|
return -ENOBUFS;
|
|
}
|
|
ipv4_devconf_setall(in_dev);
|
|
if (ifa->ifa_dev != in_dev) {
|
|
WARN_ON(ifa->ifa_dev);
|
|
in_dev_hold(in_dev);
|
|
ifa->ifa_dev = in_dev;
|
|
}
|
|
if (ipv4_is_loopback(ifa->ifa_local))
|
|
ifa->ifa_scope = RT_SCOPE_HOST;
|
|
return inet_insert_ifa(ifa);
|
|
}
|
|
|
|
/* Caller must hold RCU or RTNL :
|
|
* We dont take a reference on found in_device
|
|
*/
|
|
struct in_device *inetdev_by_index(struct net *net, int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
struct in_device *in_dev = NULL;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(net, ifindex);
|
|
if (dev)
|
|
in_dev = rcu_dereference_rtnl(dev->ip_ptr);
|
|
rcu_read_unlock();
|
|
return in_dev;
|
|
}
|
|
EXPORT_SYMBOL(inetdev_by_index);
|
|
|
|
/* Called only from RTNL semaphored context. No locks. */
|
|
|
|
struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
|
|
__be32 mask)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
for_primary_ifa(in_dev) {
|
|
if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
|
|
return ifa;
|
|
} endfor_ifa(in_dev);
|
|
return NULL;
|
|
}
|
|
|
|
static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlattr *tb[IFA_MAX+1];
|
|
struct in_device *in_dev;
|
|
struct ifaddrmsg *ifm;
|
|
struct in_ifaddr *ifa, **ifap;
|
|
int err = -EINVAL;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
in_dev = inetdev_by_index(net, ifm->ifa_index);
|
|
if (in_dev == NULL) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
|
|
ifap = &ifa->ifa_next) {
|
|
if (tb[IFA_LOCAL] &&
|
|
ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
|
|
continue;
|
|
|
|
if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
|
|
continue;
|
|
|
|
if (tb[IFA_ADDRESS] &&
|
|
(ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
|
|
!inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
|
|
continue;
|
|
|
|
__inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
|
|
return 0;
|
|
}
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
|
|
{
|
|
struct nlattr *tb[IFA_MAX+1];
|
|
struct in_ifaddr *ifa;
|
|
struct ifaddrmsg *ifm;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
err = -EINVAL;
|
|
if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
|
|
goto errout;
|
|
|
|
dev = __dev_get_by_index(net, ifm->ifa_index);
|
|
err = -ENODEV;
|
|
if (dev == NULL)
|
|
goto errout;
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
err = -ENOBUFS;
|
|
if (in_dev == NULL)
|
|
goto errout;
|
|
|
|
ifa = inet_alloc_ifa();
|
|
if (ifa == NULL)
|
|
/*
|
|
* A potential indev allocation can be left alive, it stays
|
|
* assigned to its device and is destroy with it.
|
|
*/
|
|
goto errout;
|
|
|
|
ipv4_devconf_setall(in_dev);
|
|
in_dev_hold(in_dev);
|
|
|
|
if (tb[IFA_ADDRESS] == NULL)
|
|
tb[IFA_ADDRESS] = tb[IFA_LOCAL];
|
|
|
|
INIT_HLIST_NODE(&ifa->hash);
|
|
ifa->ifa_prefixlen = ifm->ifa_prefixlen;
|
|
ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
|
|
ifa->ifa_flags = ifm->ifa_flags;
|
|
ifa->ifa_scope = ifm->ifa_scope;
|
|
ifa->ifa_dev = in_dev;
|
|
|
|
ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
|
|
ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
|
|
|
|
if (tb[IFA_BROADCAST])
|
|
ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
|
|
|
|
if (tb[IFA_LABEL])
|
|
nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
|
|
else
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
|
|
return ifa;
|
|
|
|
errout:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct in_ifaddr *ifa;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
ifa = rtm_to_ifaddr(net, nlh);
|
|
if (IS_ERR(ifa))
|
|
return PTR_ERR(ifa);
|
|
|
|
return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
|
|
}
|
|
|
|
/*
|
|
* Determine a default network mask, based on the IP address.
|
|
*/
|
|
|
|
static int inet_abc_len(__be32 addr)
|
|
{
|
|
int rc = -1; /* Something else, probably a multicast. */
|
|
|
|
if (ipv4_is_zeronet(addr))
|
|
rc = 0;
|
|
else {
|
|
__u32 haddr = ntohl(addr);
|
|
|
|
if (IN_CLASSA(haddr))
|
|
rc = 8;
|
|
else if (IN_CLASSB(haddr))
|
|
rc = 16;
|
|
else if (IN_CLASSC(haddr))
|
|
rc = 24;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct ifreq ifr;
|
|
struct sockaddr_in sin_orig;
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
|
|
struct in_device *in_dev;
|
|
struct in_ifaddr **ifap = NULL;
|
|
struct in_ifaddr *ifa = NULL;
|
|
struct net_device *dev;
|
|
char *colon;
|
|
int ret = -EFAULT;
|
|
int tryaddrmatch = 0;
|
|
|
|
/*
|
|
* Fetch the caller's info block into kernel space
|
|
*/
|
|
|
|
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
|
|
goto out;
|
|
ifr.ifr_name[IFNAMSIZ - 1] = 0;
|
|
|
|
/* save original address for comparison */
|
|
memcpy(&sin_orig, sin, sizeof(*sin));
|
|
|
|
colon = strchr(ifr.ifr_name, ':');
|
|
if (colon)
|
|
*colon = 0;
|
|
|
|
dev_load(net, ifr.ifr_name);
|
|
|
|
switch (cmd) {
|
|
case SIOCGIFADDR: /* Get interface address */
|
|
case SIOCGIFBRDADDR: /* Get the broadcast address */
|
|
case SIOCGIFDSTADDR: /* Get the destination address */
|
|
case SIOCGIFNETMASK: /* Get the netmask for the interface */
|
|
/* Note that these ioctls will not sleep,
|
|
so that we do not impose a lock.
|
|
One day we will be forced to put shlock here (I mean SMP)
|
|
*/
|
|
tryaddrmatch = (sin_orig.sin_family == AF_INET);
|
|
memset(sin, 0, sizeof(*sin));
|
|
sin->sin_family = AF_INET;
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
ret = -EACCES;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
goto out;
|
|
break;
|
|
case SIOCSIFADDR: /* Set interface address (and family) */
|
|
case SIOCSIFBRDADDR: /* Set the broadcast address */
|
|
case SIOCSIFDSTADDR: /* Set the destination address */
|
|
case SIOCSIFNETMASK: /* Set the netmask for the interface */
|
|
ret = -EACCES;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
goto out;
|
|
ret = -EINVAL;
|
|
if (sin->sin_family != AF_INET)
|
|
goto out;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
rtnl_lock();
|
|
|
|
ret = -ENODEV;
|
|
dev = __dev_get_by_name(net, ifr.ifr_name);
|
|
if (!dev)
|
|
goto done;
|
|
|
|
if (colon)
|
|
*colon = ':';
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev) {
|
|
if (tryaddrmatch) {
|
|
/* Matthias Andree */
|
|
/* compare label and address (4.4BSD style) */
|
|
/* note: we only do this for a limited set of ioctls
|
|
and only if the original address family was AF_INET.
|
|
This is checked above. */
|
|
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
|
|
ifap = &ifa->ifa_next) {
|
|
if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
|
|
sin_orig.sin_addr.s_addr ==
|
|
ifa->ifa_local) {
|
|
break; /* found */
|
|
}
|
|
}
|
|
}
|
|
/* we didn't get a match, maybe the application is
|
|
4.3BSD-style and passed in junk so we fall back to
|
|
comparing just the label */
|
|
if (!ifa) {
|
|
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
|
|
ifap = &ifa->ifa_next)
|
|
if (!strcmp(ifr.ifr_name, ifa->ifa_label))
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret = -EADDRNOTAVAIL;
|
|
if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
|
|
goto done;
|
|
|
|
switch (cmd) {
|
|
case SIOCGIFADDR: /* Get interface address */
|
|
sin->sin_addr.s_addr = ifa->ifa_local;
|
|
goto rarok;
|
|
|
|
case SIOCGIFBRDADDR: /* Get the broadcast address */
|
|
sin->sin_addr.s_addr = ifa->ifa_broadcast;
|
|
goto rarok;
|
|
|
|
case SIOCGIFDSTADDR: /* Get the destination address */
|
|
sin->sin_addr.s_addr = ifa->ifa_address;
|
|
goto rarok;
|
|
|
|
case SIOCGIFNETMASK: /* Get the netmask for the interface */
|
|
sin->sin_addr.s_addr = ifa->ifa_mask;
|
|
goto rarok;
|
|
|
|
case SIOCSIFFLAGS:
|
|
if (colon) {
|
|
ret = -EADDRNOTAVAIL;
|
|
if (!ifa)
|
|
break;
|
|
ret = 0;
|
|
if (!(ifr.ifr_flags & IFF_UP))
|
|
inet_del_ifa(in_dev, ifap, 1);
|
|
break;
|
|
}
|
|
ret = dev_change_flags(dev, ifr.ifr_flags);
|
|
break;
|
|
|
|
case SIOCSIFADDR: /* Set interface address (and family) */
|
|
ret = -EINVAL;
|
|
if (inet_abc_len(sin->sin_addr.s_addr) < 0)
|
|
break;
|
|
|
|
if (!ifa) {
|
|
ret = -ENOBUFS;
|
|
ifa = inet_alloc_ifa();
|
|
INIT_HLIST_NODE(&ifa->hash);
|
|
if (!ifa)
|
|
break;
|
|
if (colon)
|
|
memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
|
|
else
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
} else {
|
|
ret = 0;
|
|
if (ifa->ifa_local == sin->sin_addr.s_addr)
|
|
break;
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_broadcast = 0;
|
|
ifa->ifa_scope = 0;
|
|
}
|
|
|
|
ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
|
|
|
|
if (!(dev->flags & IFF_POINTOPOINT)) {
|
|
ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
|
|
ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
|
|
if ((dev->flags & IFF_BROADCAST) &&
|
|
ifa->ifa_prefixlen < 31)
|
|
ifa->ifa_broadcast = ifa->ifa_address |
|
|
~ifa->ifa_mask;
|
|
} else {
|
|
ifa->ifa_prefixlen = 32;
|
|
ifa->ifa_mask = inet_make_mask(32);
|
|
}
|
|
ret = inet_set_ifa(dev, ifa);
|
|
break;
|
|
|
|
case SIOCSIFBRDADDR: /* Set the broadcast address */
|
|
ret = 0;
|
|
if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_broadcast = sin->sin_addr.s_addr;
|
|
inet_insert_ifa(ifa);
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFDSTADDR: /* Set the destination address */
|
|
ret = 0;
|
|
if (ifa->ifa_address == sin->sin_addr.s_addr)
|
|
break;
|
|
ret = -EINVAL;
|
|
if (inet_abc_len(sin->sin_addr.s_addr) < 0)
|
|
break;
|
|
ret = 0;
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_address = sin->sin_addr.s_addr;
|
|
inet_insert_ifa(ifa);
|
|
break;
|
|
|
|
case SIOCSIFNETMASK: /* Set the netmask for the interface */
|
|
|
|
/*
|
|
* The mask we set must be legal.
|
|
*/
|
|
ret = -EINVAL;
|
|
if (bad_mask(sin->sin_addr.s_addr, 0))
|
|
break;
|
|
ret = 0;
|
|
if (ifa->ifa_mask != sin->sin_addr.s_addr) {
|
|
__be32 old_mask = ifa->ifa_mask;
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_mask = sin->sin_addr.s_addr;
|
|
ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
|
|
|
|
/* See if current broadcast address matches
|
|
* with current netmask, then recalculate
|
|
* the broadcast address. Otherwise it's a
|
|
* funny address, so don't touch it since
|
|
* the user seems to know what (s)he's doing...
|
|
*/
|
|
if ((dev->flags & IFF_BROADCAST) &&
|
|
(ifa->ifa_prefixlen < 31) &&
|
|
(ifa->ifa_broadcast ==
|
|
(ifa->ifa_local|~old_mask))) {
|
|
ifa->ifa_broadcast = (ifa->ifa_local |
|
|
~sin->sin_addr.s_addr);
|
|
}
|
|
inet_insert_ifa(ifa);
|
|
}
|
|
break;
|
|
}
|
|
done:
|
|
rtnl_unlock();
|
|
out:
|
|
return ret;
|
|
rarok:
|
|
rtnl_unlock();
|
|
ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
|
|
goto out;
|
|
}
|
|
|
|
static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
|
|
{
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
struct in_ifaddr *ifa;
|
|
struct ifreq ifr;
|
|
int done = 0;
|
|
|
|
if (!in_dev)
|
|
goto out;
|
|
|
|
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
|
|
if (!buf) {
|
|
done += sizeof(ifr);
|
|
continue;
|
|
}
|
|
if (len < (int) sizeof(ifr))
|
|
break;
|
|
memset(&ifr, 0, sizeof(struct ifreq));
|
|
if (ifa->ifa_label)
|
|
strcpy(ifr.ifr_name, ifa->ifa_label);
|
|
else
|
|
strcpy(ifr.ifr_name, dev->name);
|
|
|
|
(*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
|
|
(*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
|
|
ifa->ifa_local;
|
|
|
|
if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
|
|
done = -EFAULT;
|
|
break;
|
|
}
|
|
buf += sizeof(struct ifreq);
|
|
len -= sizeof(struct ifreq);
|
|
done += sizeof(struct ifreq);
|
|
}
|
|
out:
|
|
return done;
|
|
}
|
|
|
|
__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
|
|
{
|
|
__be32 addr = 0;
|
|
struct in_device *in_dev;
|
|
struct net *net = dev_net(dev);
|
|
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
goto no_in_dev;
|
|
|
|
for_primary_ifa(in_dev) {
|
|
if (ifa->ifa_scope > scope)
|
|
continue;
|
|
if (!dst || inet_ifa_match(dst, ifa)) {
|
|
addr = ifa->ifa_local;
|
|
break;
|
|
}
|
|
if (!addr)
|
|
addr = ifa->ifa_local;
|
|
} endfor_ifa(in_dev);
|
|
|
|
if (addr)
|
|
goto out_unlock;
|
|
no_in_dev:
|
|
|
|
/* Not loopback addresses on loopback should be preferred
|
|
in this case. It is importnat that lo is the first interface
|
|
in dev_base list.
|
|
*/
|
|
for_each_netdev_rcu(net, dev) {
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
continue;
|
|
|
|
for_primary_ifa(in_dev) {
|
|
if (ifa->ifa_scope != RT_SCOPE_LINK &&
|
|
ifa->ifa_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
goto out_unlock;
|
|
}
|
|
} endfor_ifa(in_dev);
|
|
}
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
return addr;
|
|
}
|
|
EXPORT_SYMBOL(inet_select_addr);
|
|
|
|
static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
|
|
__be32 local, int scope)
|
|
{
|
|
int same = 0;
|
|
__be32 addr = 0;
|
|
|
|
for_ifa(in_dev) {
|
|
if (!addr &&
|
|
(local == ifa->ifa_local || !local) &&
|
|
ifa->ifa_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
if (same)
|
|
break;
|
|
}
|
|
if (!same) {
|
|
same = (!local || inet_ifa_match(local, ifa)) &&
|
|
(!dst || inet_ifa_match(dst, ifa));
|
|
if (same && addr) {
|
|
if (local || !dst)
|
|
break;
|
|
/* Is the selected addr into dst subnet? */
|
|
if (inet_ifa_match(addr, ifa))
|
|
break;
|
|
/* No, then can we use new local src? */
|
|
if (ifa->ifa_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
break;
|
|
}
|
|
/* search for large dst subnet for addr */
|
|
same = 0;
|
|
}
|
|
}
|
|
} endfor_ifa(in_dev);
|
|
|
|
return same ? addr : 0;
|
|
}
|
|
|
|
/*
|
|
* Confirm that local IP address exists using wildcards:
|
|
* - in_dev: only on this interface, 0=any interface
|
|
* - dst: only in the same subnet as dst, 0=any dst
|
|
* - local: address, 0=autoselect the local address
|
|
* - scope: maximum allowed scope value for the local address
|
|
*/
|
|
__be32 inet_confirm_addr(struct in_device *in_dev,
|
|
__be32 dst, __be32 local, int scope)
|
|
{
|
|
__be32 addr = 0;
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
|
|
if (scope != RT_SCOPE_LINK)
|
|
return confirm_addr_indev(in_dev, dst, local, scope);
|
|
|
|
net = dev_net(in_dev->dev);
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev) {
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev) {
|
|
addr = confirm_addr_indev(in_dev, dst, local, scope);
|
|
if (addr)
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return addr;
|
|
}
|
|
EXPORT_SYMBOL(inet_confirm_addr);
|
|
|
|
/*
|
|
* Device notifier
|
|
*/
|
|
|
|
int register_inetaddr_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&inetaddr_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(register_inetaddr_notifier);
|
|
|
|
int unregister_inetaddr_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_inetaddr_notifier);
|
|
|
|
/* Rename ifa_labels for a device name change. Make some effort to preserve
|
|
* existing alias numbering and to create unique labels if possible.
|
|
*/
|
|
static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
|
|
{
|
|
struct in_ifaddr *ifa;
|
|
int named = 0;
|
|
|
|
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
|
|
char old[IFNAMSIZ], *dot;
|
|
|
|
memcpy(old, ifa->ifa_label, IFNAMSIZ);
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
if (named++ == 0)
|
|
goto skip;
|
|
dot = strchr(old, ':');
|
|
if (dot == NULL) {
|
|
sprintf(old, ":%d", named);
|
|
dot = old;
|
|
}
|
|
if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
|
|
strcat(ifa->ifa_label, dot);
|
|
else
|
|
strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
|
|
skip:
|
|
rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
|
|
}
|
|
}
|
|
|
|
static bool inetdev_valid_mtu(unsigned int mtu)
|
|
{
|
|
return mtu >= 68;
|
|
}
|
|
|
|
static void inetdev_send_gratuitous_arp(struct net_device *dev,
|
|
struct in_device *in_dev)
|
|
|
|
{
|
|
struct in_ifaddr *ifa;
|
|
|
|
for (ifa = in_dev->ifa_list; ifa;
|
|
ifa = ifa->ifa_next) {
|
|
arp_send(ARPOP_REQUEST, ETH_P_ARP,
|
|
ifa->ifa_local, dev,
|
|
ifa->ifa_local, NULL,
|
|
dev->dev_addr, NULL);
|
|
}
|
|
}
|
|
|
|
/* Called only under RTNL semaphore */
|
|
|
|
static int inetdev_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
struct in_device *in_dev;
|
|
|
|
if (event == NETDEV_UNREGISTER_FINAL)
|
|
goto out;
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
ASSERT_RTNL();
|
|
|
|
if (!in_dev) {
|
|
if (event == NETDEV_REGISTER) {
|
|
in_dev = inetdev_init(dev);
|
|
if (!in_dev)
|
|
return notifier_from_errno(-ENOMEM);
|
|
if (dev->flags & IFF_LOOPBACK) {
|
|
IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
|
|
IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
|
|
}
|
|
} else if (event == NETDEV_CHANGEMTU) {
|
|
/* Re-enabling IP */
|
|
if (inetdev_valid_mtu(dev->mtu))
|
|
in_dev = inetdev_init(dev);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
pr_debug("%s: bug\n", __func__);
|
|
RCU_INIT_POINTER(dev->ip_ptr, NULL);
|
|
break;
|
|
case NETDEV_UP:
|
|
if (!inetdev_valid_mtu(dev->mtu))
|
|
break;
|
|
if (dev->flags & IFF_LOOPBACK) {
|
|
struct in_ifaddr *ifa = inet_alloc_ifa();
|
|
|
|
if (ifa) {
|
|
INIT_HLIST_NODE(&ifa->hash);
|
|
ifa->ifa_local =
|
|
ifa->ifa_address = htonl(INADDR_LOOPBACK);
|
|
ifa->ifa_prefixlen = 8;
|
|
ifa->ifa_mask = inet_make_mask(8);
|
|
in_dev_hold(in_dev);
|
|
ifa->ifa_dev = in_dev;
|
|
ifa->ifa_scope = RT_SCOPE_HOST;
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
inet_insert_ifa(ifa);
|
|
}
|
|
}
|
|
ip_mc_up(in_dev);
|
|
/* fall through */
|
|
case NETDEV_CHANGEADDR:
|
|
if (!IN_DEV_ARP_NOTIFY(in_dev))
|
|
break;
|
|
/* fall through */
|
|
case NETDEV_NOTIFY_PEERS:
|
|
/* Send gratuitous ARP to notify of link change */
|
|
inetdev_send_gratuitous_arp(dev, in_dev);
|
|
break;
|
|
case NETDEV_DOWN:
|
|
ip_mc_down(in_dev);
|
|
break;
|
|
case NETDEV_PRE_TYPE_CHANGE:
|
|
ip_mc_unmap(in_dev);
|
|
break;
|
|
case NETDEV_POST_TYPE_CHANGE:
|
|
ip_mc_remap(in_dev);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
if (inetdev_valid_mtu(dev->mtu))
|
|
break;
|
|
/* disable IP when MTU is not enough */
|
|
case NETDEV_UNREGISTER:
|
|
inetdev_destroy(in_dev);
|
|
break;
|
|
case NETDEV_CHANGENAME:
|
|
/* Do not notify about label change, this event is
|
|
* not interesting to applications using netlink.
|
|
*/
|
|
inetdev_changename(dev, in_dev);
|
|
|
|
devinet_sysctl_unregister(in_dev);
|
|
devinet_sysctl_register(in_dev);
|
|
break;
|
|
}
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ip_netdev_notifier = {
|
|
.notifier_call = inetdev_event,
|
|
};
|
|
|
|
static size_t inet_nlmsg_size(void)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
|
|
+ nla_total_size(4) /* IFA_ADDRESS */
|
|
+ nla_total_size(4) /* IFA_LOCAL */
|
|
+ nla_total_size(4) /* IFA_BROADCAST */
|
|
+ nla_total_size(IFNAMSIZ); /* IFA_LABEL */
|
|
}
|
|
|
|
static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
|
|
u32 pid, u32 seq, int event, unsigned int flags)
|
|
{
|
|
struct ifaddrmsg *ifm;
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
ifm->ifa_family = AF_INET;
|
|
ifm->ifa_prefixlen = ifa->ifa_prefixlen;
|
|
ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
|
|
ifm->ifa_scope = ifa->ifa_scope;
|
|
ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
|
|
|
|
if ((ifa->ifa_address &&
|
|
nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
|
|
(ifa->ifa_local &&
|
|
nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
|
|
(ifa->ifa_broadcast &&
|
|
nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
|
|
(ifa->ifa_label[0] &&
|
|
nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
|
|
goto nla_put_failure;
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
int h, s_h;
|
|
int idx, s_idx;
|
|
int ip_idx, s_ip_idx;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
struct in_ifaddr *ifa;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
|
|
s_h = cb->args[0];
|
|
s_idx = idx = cb->args[1];
|
|
s_ip_idx = ip_idx = cb->args[2];
|
|
|
|
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
|
|
idx = 0;
|
|
head = &net->dev_index_head[h];
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (h > s_h || idx > s_idx)
|
|
s_ip_idx = 0;
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
goto cont;
|
|
|
|
for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
|
|
ifa = ifa->ifa_next, ip_idx++) {
|
|
if (ip_idx < s_ip_idx)
|
|
continue;
|
|
if (inet_fill_ifaddr(skb, ifa,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
RTM_NEWADDR, NLM_F_MULTI) <= 0) {
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
}
|
|
cont:
|
|
idx++;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
done:
|
|
cb->args[0] = h;
|
|
cb->args[1] = idx;
|
|
cb->args[2] = ip_idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
|
|
u32 pid)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 seq = nlh ? nlh->nlmsg_seq : 0;
|
|
int err = -ENOBUFS;
|
|
struct net *net;
|
|
|
|
net = dev_net(ifa->ifa_dev->dev);
|
|
skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in inet_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
|
|
}
|
|
|
|
static size_t inet_get_link_af_size(const struct net_device *dev)
|
|
{
|
|
struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
|
|
|
|
if (!in_dev)
|
|
return 0;
|
|
|
|
return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
|
|
}
|
|
|
|
static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
|
|
struct nlattr *nla;
|
|
int i;
|
|
|
|
if (!in_dev)
|
|
return -ENODATA;
|
|
|
|
nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
|
|
if (nla == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
for (i = 0; i < IPV4_DEVCONF_MAX; i++)
|
|
((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
|
|
[IFLA_INET_CONF] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int inet_validate_link_af(const struct net_device *dev,
|
|
const struct nlattr *nla)
|
|
{
|
|
struct nlattr *a, *tb[IFLA_INET_MAX+1];
|
|
int err, rem;
|
|
|
|
if (dev && !__in_dev_get_rtnl(dev))
|
|
return -EAFNOSUPPORT;
|
|
|
|
err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[IFLA_INET_CONF]) {
|
|
nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
|
|
int cfgid = nla_type(a);
|
|
|
|
if (nla_len(a) < 4)
|
|
return -EINVAL;
|
|
|
|
if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
|
|
{
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
struct nlattr *a, *tb[IFLA_INET_MAX+1];
|
|
int rem;
|
|
|
|
if (!in_dev)
|
|
return -EAFNOSUPPORT;
|
|
|
|
if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
|
|
BUG();
|
|
|
|
if (tb[IFLA_INET_CONF]) {
|
|
nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
|
|
ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static void devinet_copy_dflt_conf(struct net *net, int i)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev) {
|
|
struct in_device *in_dev;
|
|
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev && !test_bit(i, in_dev->cnf.state))
|
|
in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* called with RTNL locked */
|
|
static void inet_forward_change(struct net *net)
|
|
{
|
|
struct net_device *dev;
|
|
int on = IPV4_DEVCONF_ALL(net, FORWARDING);
|
|
|
|
IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
|
|
IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
|
|
|
|
for_each_netdev(net, dev) {
|
|
struct in_device *in_dev;
|
|
if (on)
|
|
dev_disable_lro(dev);
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev)
|
|
IN_DEV_CONF_SET(in_dev, FORWARDING, on);
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
static int devinet_conf_proc(ctl_table *ctl, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int old_value = *(int *)ctl->data;
|
|
int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
int new_value = *(int *)ctl->data;
|
|
|
|
if (write) {
|
|
struct ipv4_devconf *cnf = ctl->extra1;
|
|
struct net *net = ctl->extra2;
|
|
int i = (int *)ctl->data - cnf->data;
|
|
|
|
set_bit(i, cnf->state);
|
|
|
|
if (cnf == net->ipv4.devconf_dflt)
|
|
devinet_copy_dflt_conf(net, i);
|
|
if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
|
|
i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
|
|
if ((new_value == 0) && (old_value != 0))
|
|
rt_cache_flush(net, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int devinet_sysctl_forward(ctl_table *ctl, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int *valp = ctl->data;
|
|
int val = *valp;
|
|
loff_t pos = *ppos;
|
|
int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
|
|
if (write && *valp != val) {
|
|
struct net *net = ctl->extra2;
|
|
|
|
if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
|
|
if (!rtnl_trylock()) {
|
|
/* Restore the original values before restarting */
|
|
*valp = val;
|
|
*ppos = pos;
|
|
return restart_syscall();
|
|
}
|
|
if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
|
|
inet_forward_change(net);
|
|
} else if (*valp) {
|
|
struct ipv4_devconf *cnf = ctl->extra1;
|
|
struct in_device *idev =
|
|
container_of(cnf, struct in_device, cnf);
|
|
dev_disable_lro(idev->dev);
|
|
}
|
|
rtnl_unlock();
|
|
rt_cache_flush(net, 0);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ipv4_doint_and_flush(ctl_table *ctl, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int *valp = ctl->data;
|
|
int val = *valp;
|
|
int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
struct net *net = ctl->extra2;
|
|
|
|
if (write && *valp != val)
|
|
rt_cache_flush(net, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
|
|
{ \
|
|
.procname = name, \
|
|
.data = ipv4_devconf.data + \
|
|
IPV4_DEVCONF_ ## attr - 1, \
|
|
.maxlen = sizeof(int), \
|
|
.mode = mval, \
|
|
.proc_handler = proc, \
|
|
.extra1 = &ipv4_devconf, \
|
|
}
|
|
|
|
#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
|
|
|
|
#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
|
|
|
|
#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
|
|
|
|
#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
|
|
|
|
static struct devinet_sysctl_table {
|
|
struct ctl_table_header *sysctl_header;
|
|
struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
|
|
} devinet_sysctl = {
|
|
.devinet_vars = {
|
|
DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
|
|
devinet_sysctl_forward),
|
|
DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
|
|
|
|
DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
|
|
DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
|
|
"accept_source_route"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
|
|
DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
|
|
DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
|
|
DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
|
|
DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
|
|
DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
|
|
DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
|
|
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
|
|
"force_igmp_version"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
|
|
"promote_secondaries"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
|
|
"route_localnet"),
|
|
},
|
|
};
|
|
|
|
static int __devinet_sysctl_register(struct net *net, char *dev_name,
|
|
struct ipv4_devconf *p)
|
|
{
|
|
int i;
|
|
struct devinet_sysctl_table *t;
|
|
char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
|
|
|
|
t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
|
|
if (!t)
|
|
goto out;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
|
|
t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
|
|
t->devinet_vars[i].extra1 = p;
|
|
t->devinet_vars[i].extra2 = net;
|
|
}
|
|
|
|
snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
|
|
|
|
t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
|
|
if (!t->sysctl_header)
|
|
goto free;
|
|
|
|
p->sysctl = t;
|
|
return 0;
|
|
|
|
free:
|
|
kfree(t);
|
|
out:
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
|
|
{
|
|
struct devinet_sysctl_table *t = cnf->sysctl;
|
|
|
|
if (t == NULL)
|
|
return;
|
|
|
|
cnf->sysctl = NULL;
|
|
unregister_net_sysctl_table(t->sysctl_header);
|
|
kfree(t);
|
|
}
|
|
|
|
static void devinet_sysctl_register(struct in_device *idev)
|
|
{
|
|
neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
|
|
__devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
|
|
&idev->cnf);
|
|
}
|
|
|
|
static void devinet_sysctl_unregister(struct in_device *idev)
|
|
{
|
|
__devinet_sysctl_unregister(&idev->cnf);
|
|
neigh_sysctl_unregister(idev->arp_parms);
|
|
}
|
|
|
|
static struct ctl_table ctl_forward_entry[] = {
|
|
{
|
|
.procname = "ip_forward",
|
|
.data = &ipv4_devconf.data[
|
|
IPV4_DEVCONF_FORWARDING - 1],
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = devinet_sysctl_forward,
|
|
.extra1 = &ipv4_devconf,
|
|
.extra2 = &init_net,
|
|
},
|
|
{ },
|
|
};
|
|
#endif
|
|
|
|
static __net_init int devinet_init_net(struct net *net)
|
|
{
|
|
int err;
|
|
struct ipv4_devconf *all, *dflt;
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table *tbl = ctl_forward_entry;
|
|
struct ctl_table_header *forw_hdr;
|
|
#endif
|
|
|
|
err = -ENOMEM;
|
|
all = &ipv4_devconf;
|
|
dflt = &ipv4_devconf_dflt;
|
|
|
|
if (!net_eq(net, &init_net)) {
|
|
all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
|
|
if (all == NULL)
|
|
goto err_alloc_all;
|
|
|
|
dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
|
|
if (dflt == NULL)
|
|
goto err_alloc_dflt;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
|
|
if (tbl == NULL)
|
|
goto err_alloc_ctl;
|
|
|
|
tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
|
|
tbl[0].extra1 = all;
|
|
tbl[0].extra2 = net;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = __devinet_sysctl_register(net, "all", all);
|
|
if (err < 0)
|
|
goto err_reg_all;
|
|
|
|
err = __devinet_sysctl_register(net, "default", dflt);
|
|
if (err < 0)
|
|
goto err_reg_dflt;
|
|
|
|
err = -ENOMEM;
|
|
forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
|
|
if (forw_hdr == NULL)
|
|
goto err_reg_ctl;
|
|
net->ipv4.forw_hdr = forw_hdr;
|
|
#endif
|
|
|
|
net->ipv4.devconf_all = all;
|
|
net->ipv4.devconf_dflt = dflt;
|
|
return 0;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err_reg_ctl:
|
|
__devinet_sysctl_unregister(dflt);
|
|
err_reg_dflt:
|
|
__devinet_sysctl_unregister(all);
|
|
err_reg_all:
|
|
if (tbl != ctl_forward_entry)
|
|
kfree(tbl);
|
|
err_alloc_ctl:
|
|
#endif
|
|
if (dflt != &ipv4_devconf_dflt)
|
|
kfree(dflt);
|
|
err_alloc_dflt:
|
|
if (all != &ipv4_devconf)
|
|
kfree(all);
|
|
err_alloc_all:
|
|
return err;
|
|
}
|
|
|
|
static __net_exit void devinet_exit_net(struct net *net)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table *tbl;
|
|
|
|
tbl = net->ipv4.forw_hdr->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->ipv4.forw_hdr);
|
|
__devinet_sysctl_unregister(net->ipv4.devconf_dflt);
|
|
__devinet_sysctl_unregister(net->ipv4.devconf_all);
|
|
kfree(tbl);
|
|
#endif
|
|
kfree(net->ipv4.devconf_dflt);
|
|
kfree(net->ipv4.devconf_all);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations devinet_ops = {
|
|
.init = devinet_init_net,
|
|
.exit = devinet_exit_net,
|
|
};
|
|
|
|
static struct rtnl_af_ops inet_af_ops = {
|
|
.family = AF_INET,
|
|
.fill_link_af = inet_fill_link_af,
|
|
.get_link_af_size = inet_get_link_af_size,
|
|
.validate_link_af = inet_validate_link_af,
|
|
.set_link_af = inet_set_link_af,
|
|
};
|
|
|
|
void __init devinet_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < IN4_ADDR_HSIZE; i++)
|
|
INIT_HLIST_HEAD(&inet_addr_lst[i]);
|
|
|
|
register_pernet_subsys(&devinet_ops);
|
|
|
|
register_gifconf(PF_INET, inet_gifconf);
|
|
register_netdevice_notifier(&ip_netdev_notifier);
|
|
|
|
rtnl_af_register(&inet_af_ops);
|
|
|
|
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
|
|
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
|
|
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
|
|
}
|
|
|