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881d966b48
This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1581 lines
37 KiB
C
1581 lines
37 KiB
C
/*
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* NET3 IP device support routines.
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*
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* Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $
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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 <asm/system.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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#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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struct ipv4_devconf ipv4_devconf = {
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.data = {
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[NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
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[NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
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[NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
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[NET_IPV4_CONF_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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[NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
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[NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
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[NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
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[NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
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[NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
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},
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};
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#define IPV4_DEVCONF_DFLT(attr) IPV4_DEVCONF(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_ANYCAST] = { .type = NLA_U32 },
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[IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
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};
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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 *in_dev,
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struct ipv4_devconf *p);
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static void devinet_sysctl_unregister(struct ipv4_devconf *p);
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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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struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
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if (ifa) {
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INIT_RCU_HEAD(&ifa->rcu_head);
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}
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return ifa;
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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 inline 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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BUG_TRAP(!idev->ifa_list);
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BUG_TRAP(!idev->mc_list);
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#ifdef NET_REFCNT_DEBUG
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printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
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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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printk("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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}
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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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INIT_RCU_HEAD(&in_dev->rcu_head);
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memcpy(&in_dev->cnf, &ipv4_devconf_dflt, 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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if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
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goto out_kfree;
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/* Reference in_dev->dev */
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dev_hold(dev);
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#ifdef CONFIG_SYSCTL
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neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
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NET_IPV4_NEIGH, "ipv4", NULL, NULL);
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#endif
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/* Account for reference dev->ip_ptr (below) */
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in_dev_hold(in_dev);
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#ifdef CONFIG_SYSCTL
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devinet_sysctl_register(in_dev, &in_dev->cnf);
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#endif
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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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if (dev == &loopback_dev)
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return;
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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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#ifdef CONFIG_SYSCTL
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devinet_sysctl_unregister(&in_dev->cnf);
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#endif
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dev->ip_ptr = NULL;
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#ifdef CONFIG_SYSCTL
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neigh_sysctl_unregister(in_dev->arp_parms);
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#endif
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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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*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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/* 2. Unlink it */
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*ifap = ifa1->ifa_next;
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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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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 = promote->ifa_next; 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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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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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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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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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)) {
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if (ifa1->ifa_local == ifa->ifa_local) {
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inet_free_ifa(ifa);
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return -EEXIST;
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}
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if (ifa1->ifa_scope != ifa->ifa_scope) {
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inet_free_ifa(ifa);
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return -EINVAL;
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}
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ifa->ifa_flags |= IFA_F_SECONDARY;
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}
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}
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if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
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net_srandom(ifa->ifa_local);
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ifap = last_primary;
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}
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ifa->ifa_next = *ifap;
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*ifap = ifa;
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/* Send message first, then call notifier.
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Notifier will trigger FIB update, so that
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listeners of netlink will know about new ifaddr */
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rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
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return 0;
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}
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static int inet_insert_ifa(struct in_ifaddr *ifa)
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{
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return __inet_insert_ifa(ifa, NULL, 0);
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}
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|
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static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
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{
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struct in_device *in_dev = __in_dev_get_rtnl(dev);
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|
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ASSERT_RTNL();
|
|
|
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if (!in_dev) {
|
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inet_free_ifa(ifa);
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return -ENOBUFS;
|
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}
|
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ipv4_devconf_setall(in_dev);
|
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if (ifa->ifa_dev != in_dev) {
|
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BUG_TRAP(!ifa->ifa_dev);
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in_dev_hold(in_dev);
|
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ifa->ifa_dev = in_dev;
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}
|
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if (LOOPBACK(ifa->ifa_local))
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ifa->ifa_scope = RT_SCOPE_HOST;
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return inet_insert_ifa(ifa);
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}
|
|
|
|
struct in_device *inetdev_by_index(int ifindex)
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{
|
|
struct net_device *dev;
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struct in_device *in_dev = NULL;
|
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read_lock(&dev_base_lock);
|
|
dev = __dev_get_by_index(&init_net, ifindex);
|
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if (dev)
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in_dev = in_dev_get(dev);
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read_unlock(&dev_base_lock);
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return in_dev;
|
|
}
|
|
|
|
/* Called only from RTNL semaphored context. No locks. */
|
|
|
|
struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
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__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 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(ifm->ifa_index);
|
|
if (in_dev == NULL) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
__in_dev_put(in_dev);
|
|
|
|
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
|
|
ifap = &ifa->ifa_next) {
|
|
if (tb[IFA_LOCAL] &&
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|
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 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 = -EINVAL;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) {
|
|
err = -EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
dev = __dev_get_by_index(&init_net, ifm->ifa_index);
|
|
if (dev == NULL) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev == NULL) {
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
ipv4_devconf_setall(in_dev);
|
|
|
|
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.
|
|
*/
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
in_dev_hold(in_dev);
|
|
|
|
if (tb[IFA_ADDRESS] == NULL)
|
|
tb[IFA_ADDRESS] = tb[IFA_LOCAL];
|
|
|
|
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_ANYCAST])
|
|
ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);
|
|
|
|
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 in_ifaddr *ifa;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
ifa = rtm_to_ifaddr(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 __inline__ int inet_abc_len(__be32 addr)
|
|
{
|
|
int rc = -1; /* Something else, probably a multicast. */
|
|
|
|
if (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(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;
|
|
|
|
#ifdef CONFIG_KMOD
|
|
dev_load(&init_net, ifr.ifr_name);
|
|
#endif
|
|
|
|
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;
|
|
if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL)
|
|
goto done;
|
|
|
|
if (colon)
|
|
*colon = ':';
|
|
|
|
if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
|
|
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_address) {
|
|
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;
|
|
if ((ifa = inet_alloc_ifa()) == NULL)
|
|
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_anycast = 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 || (ifa = in_dev->ifa_list) == NULL)
|
|
goto out;
|
|
|
|
for (; 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;
|
|
|
|
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);
|
|
no_in_dev:
|
|
rcu_read_unlock();
|
|
|
|
if (addr)
|
|
goto out;
|
|
|
|
/* Not loopback addresses on loopback should be preferred
|
|
in this case. It is importnat that lo is the first interface
|
|
in dev_base list.
|
|
*/
|
|
read_lock(&dev_base_lock);
|
|
rcu_read_lock();
|
|
for_each_netdev(&init_net, dev) {
|
|
if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
|
|
continue;
|
|
|
|
for_primary_ifa(in_dev) {
|
|
if (ifa->ifa_scope != RT_SCOPE_LINK &&
|
|
ifa->ifa_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
goto out_unlock_both;
|
|
}
|
|
} endfor_ifa(in_dev);
|
|
}
|
|
out_unlock_both:
|
|
read_unlock(&dev_base_lock);
|
|
rcu_read_unlock();
|
|
out:
|
|
return 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:
|
|
* - 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(const struct net_device *dev, __be32 dst, __be32 local, int scope)
|
|
{
|
|
__be32 addr = 0;
|
|
struct in_device *in_dev;
|
|
|
|
if (dev) {
|
|
rcu_read_lock();
|
|
if ((in_dev = __in_dev_get_rcu(dev)))
|
|
addr = confirm_addr_indev(in_dev, dst, local, scope);
|
|
rcu_read_unlock();
|
|
|
|
return addr;
|
|
}
|
|
|
|
read_lock(&dev_base_lock);
|
|
rcu_read_lock();
|
|
for_each_netdev(&init_net, dev) {
|
|
if ((in_dev = __in_dev_get_rcu(dev))) {
|
|
addr = confirm_addr_indev(in_dev, dst, local, scope);
|
|
if (addr)
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
read_unlock(&dev_base_lock);
|
|
|
|
return addr;
|
|
}
|
|
|
|
/*
|
|
* Device notifier
|
|
*/
|
|
|
|
int register_inetaddr_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&inetaddr_chain, nb);
|
|
}
|
|
|
|
int unregister_inetaddr_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
|
|
}
|
|
|
|
/* 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)
|
|
continue;
|
|
dot = strchr(ifa->ifa_label, ':');
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 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 = __in_dev_get_rtnl(dev);
|
|
|
|
if (dev->nd_net != &init_net)
|
|
return NOTIFY_DONE;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!in_dev) {
|
|
if (event == NETDEV_REGISTER) {
|
|
in_dev = inetdev_init(dev);
|
|
if (!in_dev)
|
|
return notifier_from_errno(-ENOMEM);
|
|
if (dev == &loopback_dev) {
|
|
IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
|
|
IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
|
|
}
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
printk(KERN_DEBUG "inetdev_event: bug\n");
|
|
dev->ip_ptr = NULL;
|
|
break;
|
|
case NETDEV_UP:
|
|
if (dev->mtu < 68)
|
|
break;
|
|
if (dev == &loopback_dev) {
|
|
struct in_ifaddr *ifa;
|
|
if ((ifa = inet_alloc_ifa()) != NULL) {
|
|
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);
|
|
break;
|
|
case NETDEV_DOWN:
|
|
ip_mc_down(in_dev);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
if (dev->mtu >= 68)
|
|
break;
|
|
/* MTU falled under 68, disable IP */
|
|
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);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
devinet_sysctl_unregister(&in_dev->cnf);
|
|
neigh_sysctl_unregister(in_dev->arp_parms);
|
|
neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
|
|
NET_IPV4_NEIGH, "ipv4", NULL, NULL);
|
|
devinet_sysctl_register(in_dev, &in_dev->cnf);
|
|
#endif
|
|
break;
|
|
}
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ip_netdev_notifier = {
|
|
.notifier_call =inetdev_event,
|
|
};
|
|
|
|
static inline 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(4) /* IFA_ANYCAST */
|
|
+ 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);
|
|
|
|
if (ifa->ifa_local)
|
|
NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
|
|
|
|
if (ifa->ifa_broadcast)
|
|
NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
|
|
|
|
if (ifa->ifa_anycast)
|
|
NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);
|
|
|
|
if (ifa->ifa_label[0])
|
|
NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
|
|
|
|
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)
|
|
{
|
|
int idx, ip_idx;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
struct in_ifaddr *ifa;
|
|
int s_ip_idx, s_idx = cb->args[0];
|
|
|
|
s_ip_idx = ip_idx = cb->args[1];
|
|
idx = 0;
|
|
for_each_netdev(&init_net, dev) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
s_ip_idx = 0;
|
|
if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
|
|
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)
|
|
goto done;
|
|
}
|
|
cont:
|
|
idx++;
|
|
}
|
|
|
|
done:
|
|
cb->args[0] = idx;
|
|
cb->args[1] = 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;
|
|
|
|
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;
|
|
}
|
|
err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err);
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static void devinet_copy_dflt_conf(int i)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
read_lock(&dev_base_lock);
|
|
for_each_netdev(&init_net, dev) {
|
|
struct in_device *in_dev;
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev && !test_bit(i, in_dev->cnf.state))
|
|
in_dev->cnf.data[i] = ipv4_devconf_dflt.data[i];
|
|
rcu_read_unlock();
|
|
}
|
|
read_unlock(&dev_base_lock);
|
|
}
|
|
|
|
static int devinet_conf_proc(ctl_table *ctl, int write,
|
|
struct file* filp, void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
|
|
|
|
if (write) {
|
|
struct ipv4_devconf *cnf = ctl->extra1;
|
|
int i = (int *)ctl->data - cnf->data;
|
|
|
|
set_bit(i, cnf->state);
|
|
|
|
if (cnf == &ipv4_devconf_dflt)
|
|
devinet_copy_dflt_conf(i);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
struct ipv4_devconf *cnf;
|
|
int *valp = table->data;
|
|
int new;
|
|
int i;
|
|
|
|
if (!newval || !newlen)
|
|
return 0;
|
|
|
|
if (newlen != sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(new, (int __user *)newval))
|
|
return -EFAULT;
|
|
|
|
if (new == *valp)
|
|
return 0;
|
|
|
|
if (oldval && oldlenp) {
|
|
size_t len;
|
|
|
|
if (get_user(len, oldlenp))
|
|
return -EFAULT;
|
|
|
|
if (len) {
|
|
if (len > table->maxlen)
|
|
len = table->maxlen;
|
|
if (copy_to_user(oldval, valp, len))
|
|
return -EFAULT;
|
|
if (put_user(len, oldlenp))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
*valp = new;
|
|
|
|
cnf = table->extra1;
|
|
i = (int *)table->data - cnf->data;
|
|
|
|
set_bit(i, cnf->state);
|
|
|
|
if (cnf == &ipv4_devconf_dflt)
|
|
devinet_copy_dflt_conf(i);
|
|
|
|
return 1;
|
|
}
|
|
|
|
void inet_forward_change(void)
|
|
{
|
|
struct net_device *dev;
|
|
int on = IPV4_DEVCONF_ALL(FORWARDING);
|
|
|
|
IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on;
|
|
IPV4_DEVCONF_DFLT(FORWARDING) = on;
|
|
|
|
read_lock(&dev_base_lock);
|
|
for_each_netdev(&init_net, dev) {
|
|
struct in_device *in_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();
|
|
}
|
|
read_unlock(&dev_base_lock);
|
|
|
|
rt_cache_flush(0);
|
|
}
|
|
|
|
static int devinet_sysctl_forward(ctl_table *ctl, int write,
|
|
struct file* filp, void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int *valp = ctl->data;
|
|
int val = *valp;
|
|
int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
|
|
|
|
if (write && *valp != val) {
|
|
if (valp == &IPV4_DEVCONF_ALL(FORWARDING))
|
|
inet_forward_change();
|
|
else if (valp != &IPV4_DEVCONF_DFLT(FORWARDING))
|
|
rt_cache_flush(0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ipv4_doint_and_flush(ctl_table *ctl, int write,
|
|
struct file* filp, void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int *valp = ctl->data;
|
|
int val = *valp;
|
|
int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
|
|
|
|
if (write && *valp != val)
|
|
rt_cache_flush(0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
|
|
newval, newlen);
|
|
|
|
if (ret == 1)
|
|
rt_cache_flush(0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
|
|
{ \
|
|
.ctl_name = NET_IPV4_CONF_ ## attr, \
|
|
.procname = name, \
|
|
.data = ipv4_devconf.data + \
|
|
NET_IPV4_CONF_ ## attr - 1, \
|
|
.maxlen = sizeof(int), \
|
|
.mode = mval, \
|
|
.proc_handler = proc, \
|
|
.strategy = sysctl, \
|
|
.extra1 = &ipv4_devconf, \
|
|
}
|
|
|
|
#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
|
|
devinet_conf_sysctl)
|
|
|
|
#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
|
|
devinet_conf_sysctl)
|
|
|
|
#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
|
|
|
|
#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
|
|
ipv4_doint_and_flush_strategy)
|
|
|
|
static struct devinet_sysctl_table {
|
|
struct ctl_table_header *sysctl_header;
|
|
ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
|
|
ctl_table devinet_dev[2];
|
|
ctl_table devinet_conf_dir[2];
|
|
ctl_table devinet_proto_dir[2];
|
|
ctl_table devinet_root_dir[2];
|
|
} devinet_sysctl = {
|
|
.devinet_vars = {
|
|
DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
|
|
devinet_sysctl_forward,
|
|
devinet_conf_sysctl),
|
|
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(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_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_dev = {
|
|
{
|
|
.ctl_name = NET_PROTO_CONF_ALL,
|
|
.procname = "all",
|
|
.mode = 0555,
|
|
.child = devinet_sysctl.devinet_vars,
|
|
},
|
|
},
|
|
.devinet_conf_dir = {
|
|
{
|
|
.ctl_name = NET_IPV4_CONF,
|
|
.procname = "conf",
|
|
.mode = 0555,
|
|
.child = devinet_sysctl.devinet_dev,
|
|
},
|
|
},
|
|
.devinet_proto_dir = {
|
|
{
|
|
.ctl_name = NET_IPV4,
|
|
.procname = "ipv4",
|
|
.mode = 0555,
|
|
.child = devinet_sysctl.devinet_conf_dir,
|
|
},
|
|
},
|
|
.devinet_root_dir = {
|
|
{
|
|
.ctl_name = CTL_NET,
|
|
.procname = "net",
|
|
.mode = 0555,
|
|
.child = devinet_sysctl.devinet_proto_dir,
|
|
},
|
|
},
|
|
};
|
|
|
|
static void devinet_sysctl_register(struct in_device *in_dev,
|
|
struct ipv4_devconf *p)
|
|
{
|
|
int i;
|
|
struct net_device *dev = in_dev ? in_dev->dev : NULL;
|
|
struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t),
|
|
GFP_KERNEL);
|
|
char *dev_name = NULL;
|
|
|
|
if (!t)
|
|
return;
|
|
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;
|
|
}
|
|
|
|
if (dev) {
|
|
dev_name = dev->name;
|
|
t->devinet_dev[0].ctl_name = dev->ifindex;
|
|
} else {
|
|
dev_name = "default";
|
|
t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
|
|
}
|
|
|
|
/*
|
|
* Make a copy of dev_name, because '.procname' is regarded as const
|
|
* by sysctl and we wouldn't want anyone to change it under our feet
|
|
* (see SIOCSIFNAME).
|
|
*/
|
|
dev_name = kstrdup(dev_name, GFP_KERNEL);
|
|
if (!dev_name)
|
|
goto free;
|
|
|
|
t->devinet_dev[0].procname = dev_name;
|
|
t->devinet_dev[0].child = t->devinet_vars;
|
|
t->devinet_conf_dir[0].child = t->devinet_dev;
|
|
t->devinet_proto_dir[0].child = t->devinet_conf_dir;
|
|
t->devinet_root_dir[0].child = t->devinet_proto_dir;
|
|
|
|
t->sysctl_header = register_sysctl_table(t->devinet_root_dir);
|
|
if (!t->sysctl_header)
|
|
goto free_procname;
|
|
|
|
p->sysctl = t;
|
|
return;
|
|
|
|
/* error path */
|
|
free_procname:
|
|
kfree(dev_name);
|
|
free:
|
|
kfree(t);
|
|
return;
|
|
}
|
|
|
|
static void devinet_sysctl_unregister(struct ipv4_devconf *p)
|
|
{
|
|
if (p->sysctl) {
|
|
struct devinet_sysctl_table *t = p->sysctl;
|
|
p->sysctl = NULL;
|
|
unregister_sysctl_table(t->sysctl_header);
|
|
kfree(t->devinet_dev[0].procname);
|
|
kfree(t);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void __init devinet_init(void)
|
|
{
|
|
register_gifconf(PF_INET, inet_gifconf);
|
|
register_netdevice_notifier(&ip_netdev_notifier);
|
|
|
|
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
|
|
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
|
|
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
|
|
#ifdef CONFIG_SYSCTL
|
|
devinet_sysctl.sysctl_header =
|
|
register_sysctl_table(devinet_sysctl.devinet_root_dir);
|
|
devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
|
|
#endif
|
|
}
|
|
|
|
EXPORT_SYMBOL(in_dev_finish_destroy);
|
|
EXPORT_SYMBOL(inet_select_addr);
|
|
EXPORT_SYMBOL(inetdev_by_index);
|
|
EXPORT_SYMBOL(register_inetaddr_notifier);
|
|
EXPORT_SYMBOL(unregister_inetaddr_notifier);
|