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![David S. Miller](/assets/img/avatar_default.png)
Two cases of overlapping changes, nothing fancy. Signed-off-by: David S. Miller <davem@davemloft.net>
2767 lines
68 KiB
C
2767 lines
68 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* NET3 IP device support routines.
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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 <linux/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/sched/signal.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 <linux/netconf.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 <net/addrconf.h>
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#define IPV6ONLY_FLAGS \
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(IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \
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IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \
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IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY)
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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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[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
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[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
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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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[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
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[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
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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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[IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
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[IFA_FLAGS] = { .type = NLA_U32 },
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[IFA_RT_PRIORITY] = { .type = NLA_U32 },
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[IFA_TARGET_NETNSID] = { .type = NLA_S32 },
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};
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struct inet_fill_args {
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u32 portid;
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u32 seq;
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int event;
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unsigned int flags;
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int netnsid;
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int ifindex;
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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 u32 inet_addr_hash(const 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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ASSERT_RTNL();
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hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
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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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ASSERT_RTNL();
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hlist_del_init_rcu(&ifa->hash);
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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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struct net_device *result = NULL;
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struct in_ifaddr *ifa;
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rcu_read_lock();
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ifa = inet_lookup_ifaddr_rcu(net, addr);
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if (!ifa) {
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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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} else {
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result = ifa->ifa_dev->dev;
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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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/* called under RCU lock */
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struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
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{
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u32 hash = inet_addr_hash(net, addr);
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struct in_ifaddr *ifa;
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hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
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if (ifa->ifa_local == addr &&
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net_eq(dev_net(ifa->ifa_dev->dev), net))
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return ifa;
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return NULL;
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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 BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
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static void inet_del_ifa(struct in_device *in_dev,
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struct in_ifaddr __rcu **ifap,
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int destroy);
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#ifdef CONFIG_SYSCTL
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static int 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 int devinet_sysctl_register(struct in_device *idev)
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{
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return 0;
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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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kfree(rcu_dereference_protected(idev->mc_hash, 1));
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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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int err = -ENOMEM;
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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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refcount_set(&in_dev->refcnt, 1);
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err = devinet_sysctl_register(in_dev);
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if (err) {
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in_dev->dead = 1;
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in_dev_put(in_dev);
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in_dev = NULL;
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goto out;
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}
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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 ?: ERR_PTR(err);
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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 net_device *dev;
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struct in_ifaddr *ifa;
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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 = rtnl_dereference(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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const struct in_ifaddr *ifa;
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rcu_read_lock();
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in_dev_for_each_ifa_rcu(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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}
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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,
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struct in_ifaddr __rcu **ifap,
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int destroy, struct nlmsghdr *nlh, u32 portid)
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{
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struct in_ifaddr *promote = NULL;
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struct in_ifaddr *ifa, *ifa1;
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struct in_ifaddr *last_prim;
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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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ifa1 = rtnl_dereference(*ifap);
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last_prim = rtnl_dereference(in_dev->ifa_list);
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if (in_dev->dead)
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goto no_promotions;
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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 __rcu **ifap1 = &ifa1->ifa_next;
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while ((ifa = rtnl_dereference(*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, portid);
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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 = rtnl_dereference(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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no_promotions:
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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, portid);
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blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
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|
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if (promote) {
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struct in_ifaddr *next_sec;
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next_sec = rtnl_dereference(promote->ifa_next);
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if (prev_prom) {
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struct in_ifaddr *last_sec;
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rcu_assign_pointer(prev_prom->ifa_next, next_sec);
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last_sec = rtnl_dereference(last_prim->ifa_next);
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rcu_assign_pointer(promote->ifa_next, last_sec);
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rcu_assign_pointer(last_prim->ifa_next, promote);
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}
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|
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promote->ifa_flags &= ~IFA_F_SECONDARY;
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rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
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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;
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ifa = rtnl_dereference(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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}
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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,
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struct in_ifaddr __rcu **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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}
|
|
|
|
static void check_lifetime(struct work_struct *work);
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|
|
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static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
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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 portid, struct netlink_ext_ack *extack)
|
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{
|
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struct in_ifaddr __rcu **last_primary, **ifap;
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struct in_device *in_dev = ifa->ifa_dev;
|
|
struct in_validator_info ivi;
|
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struct in_ifaddr *ifa1;
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int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!ifa->ifa_local) {
|
|
inet_free_ifa(ifa);
|
|
return 0;
|
|
}
|
|
|
|
ifa->ifa_flags &= ~IFA_F_SECONDARY;
|
|
last_primary = &in_dev->ifa_list;
|
|
|
|
/* Don't set IPv6 only flags to IPv4 addresses */
|
|
ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
|
|
|
|
ifap = &in_dev->ifa_list;
|
|
ifa1 = rtnl_dereference(*ifap);
|
|
|
|
while (ifa1) {
|
|
if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
|
|
ifa->ifa_scope <= ifa1->ifa_scope)
|
|
last_primary = &ifa1->ifa_next;
|
|
if (ifa1->ifa_mask == ifa->ifa_mask &&
|
|
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;
|
|
}
|
|
|
|
ifap = &ifa1->ifa_next;
|
|
ifa1 = rtnl_dereference(*ifap);
|
|
}
|
|
|
|
/* Allow any devices that wish to register ifaddr validtors to weigh
|
|
* in now, before changes are committed. The rntl lock is serializing
|
|
* access here, so the state should not change between a validator call
|
|
* and a final notify on commit. This isn't invoked on promotion under
|
|
* the assumption that validators are checking the address itself, and
|
|
* not the flags.
|
|
*/
|
|
ivi.ivi_addr = ifa->ifa_address;
|
|
ivi.ivi_dev = ifa->ifa_dev;
|
|
ivi.extack = extack;
|
|
ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
|
|
NETDEV_UP, &ivi);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret) {
|
|
inet_free_ifa(ifa);
|
|
return ret;
|
|
}
|
|
|
|
if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
|
|
prandom_seed((__force u32) ifa->ifa_local);
|
|
ifap = last_primary;
|
|
}
|
|
|
|
rcu_assign_pointer(ifa->ifa_next, *ifap);
|
|
rcu_assign_pointer(*ifap, ifa);
|
|
|
|
inet_hash_insert(dev_net(in_dev->dev), ifa);
|
|
|
|
cancel_delayed_work(&check_lifetime_work);
|
|
queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
|
|
|
|
/* 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, portid);
|
|
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, NULL);
|
|
}
|
|
|
|
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);
|
|
neigh_parms_data_state_setall(in_dev->arp_parms);
|
|
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)
|
|
{
|
|
struct in_ifaddr *ifa;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
in_dev_for_each_ifa_rtnl(ifa, in_dev) {
|
|
if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
|
|
return ifa;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
|
|
{
|
|
struct ip_mreqn mreq = {
|
|
.imr_multiaddr.s_addr = ifa->ifa_address,
|
|
.imr_ifindex = ifa->ifa_dev->dev->ifindex,
|
|
};
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
lock_sock(sk);
|
|
if (join)
|
|
ret = ip_mc_join_group(sk, &mreq);
|
|
else
|
|
ret = ip_mc_leave_group(sk, &mreq);
|
|
release_sock(sk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct in_ifaddr __rcu **ifap;
|
|
struct nlattr *tb[IFA_MAX+1];
|
|
struct in_device *in_dev;
|
|
struct ifaddrmsg *ifm;
|
|
struct in_ifaddr *ifa;
|
|
|
|
int err = -EINVAL;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
|
|
ifa_ipv4_policy, extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
in_dev = inetdev_by_index(net, ifm->ifa_index);
|
|
if (!in_dev) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
|
|
ifap = &ifa->ifa_next) {
|
|
if (tb[IFA_LOCAL] &&
|
|
ifa->ifa_local != nla_get_in_addr(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_in_addr(tb[IFA_ADDRESS]), ifa)))
|
|
continue;
|
|
|
|
if (ipv4_is_multicast(ifa->ifa_address))
|
|
ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
|
|
__inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
|
|
return 0;
|
|
}
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
#define INFINITY_LIFE_TIME 0xFFFFFFFF
|
|
|
|
static void check_lifetime(struct work_struct *work)
|
|
{
|
|
unsigned long now, next, next_sec, next_sched;
|
|
struct in_ifaddr *ifa;
|
|
struct hlist_node *n;
|
|
int i;
|
|
|
|
now = jiffies;
|
|
next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
|
|
|
|
for (i = 0; i < IN4_ADDR_HSIZE; i++) {
|
|
bool change_needed = false;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
|
|
unsigned long age;
|
|
|
|
if (ifa->ifa_flags & IFA_F_PERMANENT)
|
|
continue;
|
|
|
|
/* We try to batch several events at once. */
|
|
age = (now - ifa->ifa_tstamp +
|
|
ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
|
|
|
|
if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
|
|
age >= ifa->ifa_valid_lft) {
|
|
change_needed = true;
|
|
} else if (ifa->ifa_preferred_lft ==
|
|
INFINITY_LIFE_TIME) {
|
|
continue;
|
|
} else if (age >= ifa->ifa_preferred_lft) {
|
|
if (time_before(ifa->ifa_tstamp +
|
|
ifa->ifa_valid_lft * HZ, next))
|
|
next = ifa->ifa_tstamp +
|
|
ifa->ifa_valid_lft * HZ;
|
|
|
|
if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
|
|
change_needed = true;
|
|
} else if (time_before(ifa->ifa_tstamp +
|
|
ifa->ifa_preferred_lft * HZ,
|
|
next)) {
|
|
next = ifa->ifa_tstamp +
|
|
ifa->ifa_preferred_lft * HZ;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
if (!change_needed)
|
|
continue;
|
|
rtnl_lock();
|
|
hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
|
|
unsigned long age;
|
|
|
|
if (ifa->ifa_flags & IFA_F_PERMANENT)
|
|
continue;
|
|
|
|
/* We try to batch several events at once. */
|
|
age = (now - ifa->ifa_tstamp +
|
|
ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
|
|
|
|
if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
|
|
age >= ifa->ifa_valid_lft) {
|
|
struct in_ifaddr __rcu **ifap;
|
|
struct in_ifaddr *tmp;
|
|
|
|
ifap = &ifa->ifa_dev->ifa_list;
|
|
tmp = rtnl_dereference(*ifap);
|
|
while (tmp) {
|
|
if (tmp == ifa) {
|
|
inet_del_ifa(ifa->ifa_dev,
|
|
ifap, 1);
|
|
break;
|
|
}
|
|
ifap = &tmp->ifa_next;
|
|
tmp = rtnl_dereference(*ifap);
|
|
}
|
|
} else if (ifa->ifa_preferred_lft !=
|
|
INFINITY_LIFE_TIME &&
|
|
age >= ifa->ifa_preferred_lft &&
|
|
!(ifa->ifa_flags & IFA_F_DEPRECATED)) {
|
|
ifa->ifa_flags |= IFA_F_DEPRECATED;
|
|
rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
next_sec = round_jiffies_up(next);
|
|
next_sched = next;
|
|
|
|
/* If rounded timeout is accurate enough, accept it. */
|
|
if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
|
|
next_sched = next_sec;
|
|
|
|
now = jiffies;
|
|
/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
|
|
if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
|
|
next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
|
|
|
|
queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
|
|
next_sched - now);
|
|
}
|
|
|
|
static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
|
|
__u32 prefered_lft)
|
|
{
|
|
unsigned long timeout;
|
|
|
|
ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
|
|
|
|
timeout = addrconf_timeout_fixup(valid_lft, HZ);
|
|
if (addrconf_finite_timeout(timeout))
|
|
ifa->ifa_valid_lft = timeout;
|
|
else
|
|
ifa->ifa_flags |= IFA_F_PERMANENT;
|
|
|
|
timeout = addrconf_timeout_fixup(prefered_lft, HZ);
|
|
if (addrconf_finite_timeout(timeout)) {
|
|
if (timeout == 0)
|
|
ifa->ifa_flags |= IFA_F_DEPRECATED;
|
|
ifa->ifa_preferred_lft = timeout;
|
|
}
|
|
ifa->ifa_tstamp = jiffies;
|
|
if (!ifa->ifa_cstamp)
|
|
ifa->ifa_cstamp = ifa->ifa_tstamp;
|
|
}
|
|
|
|
static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
|
|
__u32 *pvalid_lft, __u32 *pprefered_lft,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
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_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
|
|
ifa_ipv4_policy, extack);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
err = -EINVAL;
|
|
if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
|
|
goto errout;
|
|
|
|
dev = __dev_get_by_index(net, ifm->ifa_index);
|
|
err = -ENODEV;
|
|
if (!dev)
|
|
goto errout;
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
err = -ENOBUFS;
|
|
if (!in_dev)
|
|
goto errout;
|
|
|
|
ifa = inet_alloc_ifa();
|
|
if (!ifa)
|
|
/*
|
|
* 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);
|
|
neigh_parms_data_state_setall(in_dev->arp_parms);
|
|
in_dev_hold(in_dev);
|
|
|
|
if (!tb[IFA_ADDRESS])
|
|
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 = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
|
|
ifm->ifa_flags;
|
|
ifa->ifa_scope = ifm->ifa_scope;
|
|
ifa->ifa_dev = in_dev;
|
|
|
|
ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
|
|
ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
|
|
|
|
if (tb[IFA_BROADCAST])
|
|
ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
|
|
|
|
if (tb[IFA_LABEL])
|
|
nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
|
|
else
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
|
|
if (tb[IFA_RT_PRIORITY])
|
|
ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
|
|
|
|
if (tb[IFA_CACHEINFO]) {
|
|
struct ifa_cacheinfo *ci;
|
|
|
|
ci = nla_data(tb[IFA_CACHEINFO]);
|
|
if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
|
|
err = -EINVAL;
|
|
goto errout_free;
|
|
}
|
|
*pvalid_lft = ci->ifa_valid;
|
|
*pprefered_lft = ci->ifa_prefered;
|
|
}
|
|
|
|
return ifa;
|
|
|
|
errout_free:
|
|
inet_free_ifa(ifa);
|
|
errout:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
|
|
{
|
|
struct in_device *in_dev = ifa->ifa_dev;
|
|
struct in_ifaddr *ifa1;
|
|
|
|
if (!ifa->ifa_local)
|
|
return NULL;
|
|
|
|
in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
|
|
if (ifa1->ifa_mask == ifa->ifa_mask &&
|
|
inet_ifa_match(ifa1->ifa_address, ifa) &&
|
|
ifa1->ifa_local == ifa->ifa_local)
|
|
return ifa1;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct in_ifaddr *ifa;
|
|
struct in_ifaddr *ifa_existing;
|
|
__u32 valid_lft = INFINITY_LIFE_TIME;
|
|
__u32 prefered_lft = INFINITY_LIFE_TIME;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
|
|
if (IS_ERR(ifa))
|
|
return PTR_ERR(ifa);
|
|
|
|
ifa_existing = find_matching_ifa(ifa);
|
|
if (!ifa_existing) {
|
|
/* It would be best to check for !NLM_F_CREATE here but
|
|
* userspace already relies on not having to provide this.
|
|
*/
|
|
set_ifa_lifetime(ifa, valid_lft, prefered_lft);
|
|
if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
|
|
int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
|
|
true, ifa);
|
|
|
|
if (ret < 0) {
|
|
inet_free_ifa(ifa);
|
|
return ret;
|
|
}
|
|
}
|
|
return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
|
|
extack);
|
|
} else {
|
|
u32 new_metric = ifa->ifa_rt_priority;
|
|
|
|
inet_free_ifa(ifa);
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL ||
|
|
!(nlh->nlmsg_flags & NLM_F_REPLACE))
|
|
return -EEXIST;
|
|
ifa = ifa_existing;
|
|
|
|
if (ifa->ifa_rt_priority != new_metric) {
|
|
fib_modify_prefix_metric(ifa, new_metric);
|
|
ifa->ifa_rt_priority = new_metric;
|
|
}
|
|
|
|
set_ifa_lifetime(ifa, valid_lft, prefered_lft);
|
|
cancel_delayed_work(&check_lifetime_work);
|
|
queue_delayed_work(system_power_efficient_wq,
|
|
&check_lifetime_work, 0);
|
|
rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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) || ipv4_is_lbcast(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;
|
|
else if (IN_CLASSE(haddr))
|
|
rc = 32;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
|
|
{
|
|
struct sockaddr_in sin_orig;
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
|
|
struct in_ifaddr __rcu **ifap = NULL;
|
|
struct in_device *in_dev;
|
|
struct in_ifaddr *ifa = NULL;
|
|
struct net_device *dev;
|
|
char *colon;
|
|
int ret = -EFAULT;
|
|
int tryaddrmatch = 0;
|
|
|
|
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 = -EPERM;
|
|
if (!ns_capable(net->user_ns, 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 = -EPERM;
|
|
if (!ns_capable(net->user_ns, 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 = rtnl_dereference(*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 = rtnl_dereference(*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 */
|
|
ret = 0;
|
|
sin->sin_addr.s_addr = ifa->ifa_local;
|
|
break;
|
|
|
|
case SIOCGIFBRDADDR: /* Get the broadcast address */
|
|
ret = 0;
|
|
sin->sin_addr.s_addr = ifa->ifa_broadcast;
|
|
break;
|
|
|
|
case SIOCGIFDSTADDR: /* Get the destination address */
|
|
ret = 0;
|
|
sin->sin_addr.s_addr = ifa->ifa_address;
|
|
break;
|
|
|
|
case SIOCGIFNETMASK: /* Get the netmask for the interface */
|
|
ret = 0;
|
|
sin->sin_addr.s_addr = ifa->ifa_mask;
|
|
break;
|
|
|
|
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, NULL);
|
|
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();
|
|
if (!ifa)
|
|
break;
|
|
INIT_HLIST_NODE(&ifa->hash);
|
|
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);
|
|
}
|
|
set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
|
|
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;
|
|
}
|
|
|
|
static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
|
|
{
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
const struct in_ifaddr *ifa;
|
|
struct ifreq ifr;
|
|
int done = 0;
|
|
|
|
if (WARN_ON(size > sizeof(struct ifreq)))
|
|
goto out;
|
|
|
|
if (!in_dev)
|
|
goto out;
|
|
|
|
in_dev_for_each_ifa_rtnl(ifa, in_dev) {
|
|
if (!buf) {
|
|
done += size;
|
|
continue;
|
|
}
|
|
if (len < size)
|
|
break;
|
|
memset(&ifr, 0, sizeof(struct ifreq));
|
|
strcpy(ifr.ifr_name, ifa->ifa_label);
|
|
|
|
(*(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 + done, &ifr, size)) {
|
|
done = -EFAULT;
|
|
break;
|
|
}
|
|
len -= size;
|
|
done += size;
|
|
}
|
|
out:
|
|
return done;
|
|
}
|
|
|
|
static __be32 in_dev_select_addr(const struct in_device *in_dev,
|
|
int scope)
|
|
{
|
|
const struct in_ifaddr *ifa;
|
|
|
|
in_dev_for_each_ifa_rcu(ifa, in_dev) {
|
|
if (ifa->ifa_flags & IFA_F_SECONDARY)
|
|
continue;
|
|
if (ifa->ifa_scope != RT_SCOPE_LINK &&
|
|
ifa->ifa_scope <= scope)
|
|
return ifa->ifa_local;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
|
|
{
|
|
const struct in_ifaddr *ifa;
|
|
__be32 addr = 0;
|
|
unsigned char localnet_scope = RT_SCOPE_HOST;
|
|
struct in_device *in_dev;
|
|
struct net *net = dev_net(dev);
|
|
int master_idx;
|
|
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
goto no_in_dev;
|
|
|
|
if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
|
|
localnet_scope = RT_SCOPE_LINK;
|
|
|
|
in_dev_for_each_ifa_rcu(ifa, in_dev) {
|
|
if (ifa->ifa_flags & IFA_F_SECONDARY)
|
|
continue;
|
|
if (min(ifa->ifa_scope, localnet_scope) > scope)
|
|
continue;
|
|
if (!dst || inet_ifa_match(dst, ifa)) {
|
|
addr = ifa->ifa_local;
|
|
break;
|
|
}
|
|
if (!addr)
|
|
addr = ifa->ifa_local;
|
|
}
|
|
|
|
if (addr)
|
|
goto out_unlock;
|
|
no_in_dev:
|
|
master_idx = l3mdev_master_ifindex_rcu(dev);
|
|
|
|
/* For VRFs, the VRF device takes the place of the loopback device,
|
|
* with addresses on it being preferred. Note in such cases the
|
|
* loopback device will be among the devices that fail the master_idx
|
|
* equality check in the loop below.
|
|
*/
|
|
if (master_idx &&
|
|
(dev = dev_get_by_index_rcu(net, master_idx)) &&
|
|
(in_dev = __in_dev_get_rcu(dev))) {
|
|
addr = in_dev_select_addr(in_dev, scope);
|
|
if (addr)
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Not loopback addresses on loopback should be preferred
|
|
in this case. It is important that lo is the first interface
|
|
in dev_base list.
|
|
*/
|
|
for_each_netdev_rcu(net, dev) {
|
|
if (l3mdev_master_ifindex_rcu(dev) != master_idx)
|
|
continue;
|
|
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
continue;
|
|
|
|
addr = in_dev_select_addr(in_dev, scope);
|
|
if (addr)
|
|
goto out_unlock;
|
|
}
|
|
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)
|
|
{
|
|
unsigned char localnet_scope = RT_SCOPE_HOST;
|
|
const struct in_ifaddr *ifa;
|
|
__be32 addr = 0;
|
|
int same = 0;
|
|
|
|
if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
|
|
localnet_scope = RT_SCOPE_LINK;
|
|
|
|
in_dev_for_each_ifa_rcu(ifa, in_dev) {
|
|
unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
|
|
|
|
if (!addr &&
|
|
(local == ifa->ifa_local || !local) &&
|
|
min_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 (min_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
break;
|
|
}
|
|
/* search for large dst subnet for addr */
|
|
same = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return same ? addr : 0;
|
|
}
|
|
|
|
/*
|
|
* Confirm that local IP address exists using wildcards:
|
|
* - net: netns to check, cannot be NULL
|
|
* - in_dev: only on this interface, NULL=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 net *net, struct in_device *in_dev,
|
|
__be32 dst, __be32 local, int scope)
|
|
{
|
|
__be32 addr = 0;
|
|
struct net_device *dev;
|
|
|
|
if (in_dev)
|
|
return confirm_addr_indev(in_dev, dst, local, scope);
|
|
|
|
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);
|
|
|
|
int register_inetaddr_validator_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(register_inetaddr_validator_notifier);
|
|
|
|
int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
|
|
nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_inetaddr_validator_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;
|
|
|
|
in_dev_for_each_ifa_rtnl(ifa, in_dev) {
|
|
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) {
|
|
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 >= IPV4_MIN_MTU;
|
|
}
|
|
|
|
static void inetdev_send_gratuitous_arp(struct net_device *dev,
|
|
struct in_device *in_dev)
|
|
|
|
{
|
|
const struct in_ifaddr *ifa;
|
|
|
|
in_dev_for_each_ifa_rtnl(ifa, in_dev) {
|
|
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 = netdev_notifier_info_to_dev(ptr);
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!in_dev) {
|
|
if (event == NETDEV_REGISTER) {
|
|
in_dev = inetdev_init(dev);
|
|
if (IS_ERR(in_dev))
|
|
return notifier_from_errno(PTR_ERR(in_dev));
|
|
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);
|
|
set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
|
|
INFINITY_LIFE_TIME);
|
|
ipv4_devconf_setall(in_dev);
|
|
neigh_parms_data_state_setall(in_dev->arp_parms);
|
|
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 */
|
|
/* fall through */
|
|
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 */
|
|
+ nla_total_size(4) /* IFA_FLAGS */
|
|
+ nla_total_size(4) /* IFA_RT_PRIORITY */
|
|
+ nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
|
|
}
|
|
|
|
static inline u32 cstamp_delta(unsigned long cstamp)
|
|
{
|
|
return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
|
|
}
|
|
|
|
static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
|
|
unsigned long tstamp, u32 preferred, u32 valid)
|
|
{
|
|
struct ifa_cacheinfo ci;
|
|
|
|
ci.cstamp = cstamp_delta(cstamp);
|
|
ci.tstamp = cstamp_delta(tstamp);
|
|
ci.ifa_prefered = preferred;
|
|
ci.ifa_valid = valid;
|
|
|
|
return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
|
|
}
|
|
|
|
static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
|
|
struct inet_fill_args *args)
|
|
{
|
|
struct ifaddrmsg *ifm;
|
|
struct nlmsghdr *nlh;
|
|
u32 preferred, valid;
|
|
|
|
nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
|
|
args->flags);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
ifm->ifa_family = AF_INET;
|
|
ifm->ifa_prefixlen = ifa->ifa_prefixlen;
|
|
ifm->ifa_flags = ifa->ifa_flags;
|
|
ifm->ifa_scope = ifa->ifa_scope;
|
|
ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
|
|
|
|
if (args->netnsid >= 0 &&
|
|
nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
|
|
goto nla_put_failure;
|
|
|
|
if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
|
|
preferred = ifa->ifa_preferred_lft;
|
|
valid = ifa->ifa_valid_lft;
|
|
if (preferred != INFINITY_LIFE_TIME) {
|
|
long tval = (jiffies - ifa->ifa_tstamp) / HZ;
|
|
|
|
if (preferred > tval)
|
|
preferred -= tval;
|
|
else
|
|
preferred = 0;
|
|
if (valid != INFINITY_LIFE_TIME) {
|
|
if (valid > tval)
|
|
valid -= tval;
|
|
else
|
|
valid = 0;
|
|
}
|
|
}
|
|
} else {
|
|
preferred = INFINITY_LIFE_TIME;
|
|
valid = INFINITY_LIFE_TIME;
|
|
}
|
|
if ((ifa->ifa_address &&
|
|
nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
|
|
(ifa->ifa_local &&
|
|
nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
|
|
(ifa->ifa_broadcast &&
|
|
nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
|
|
(ifa->ifa_label[0] &&
|
|
nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
|
|
nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
|
|
(ifa->ifa_rt_priority &&
|
|
nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
|
|
put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
|
|
preferred, valid))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
|
|
struct inet_fill_args *fillargs,
|
|
struct net **tgt_net, struct sock *sk,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct netlink_ext_ack *extack = cb->extack;
|
|
struct nlattr *tb[IFA_MAX+1];
|
|
struct ifaddrmsg *ifm;
|
|
int err, i;
|
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
fillargs->ifindex = ifm->ifa_index;
|
|
if (fillargs->ifindex) {
|
|
cb->answer_flags |= NLM_F_DUMP_FILTERED;
|
|
fillargs->flags |= NLM_F_DUMP_FILTERED;
|
|
}
|
|
|
|
err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
|
|
ifa_ipv4_policy, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
for (i = 0; i <= IFA_MAX; ++i) {
|
|
if (!tb[i])
|
|
continue;
|
|
|
|
if (i == IFA_TARGET_NETNSID) {
|
|
struct net *net;
|
|
|
|
fillargs->netnsid = nla_get_s32(tb[i]);
|
|
|
|
net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
|
|
if (IS_ERR(net)) {
|
|
fillargs->netnsid = -1;
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
|
|
return PTR_ERR(net);
|
|
}
|
|
*tgt_net = net;
|
|
} else {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
|
|
struct netlink_callback *cb, int s_ip_idx,
|
|
struct inet_fill_args *fillargs)
|
|
{
|
|
struct in_ifaddr *ifa;
|
|
int ip_idx = 0;
|
|
int err;
|
|
|
|
in_dev_for_each_ifa_rtnl(ifa, in_dev) {
|
|
if (ip_idx < s_ip_idx) {
|
|
ip_idx++;
|
|
continue;
|
|
}
|
|
err = inet_fill_ifaddr(skb, ifa, fillargs);
|
|
if (err < 0)
|
|
goto done;
|
|
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
ip_idx++;
|
|
}
|
|
err = 0;
|
|
|
|
done:
|
|
cb->args[2] = ip_idx;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
const struct nlmsghdr *nlh = cb->nlh;
|
|
struct inet_fill_args fillargs = {
|
|
.portid = NETLINK_CB(cb->skb).portid,
|
|
.seq = nlh->nlmsg_seq,
|
|
.event = RTM_NEWADDR,
|
|
.flags = NLM_F_MULTI,
|
|
.netnsid = -1,
|
|
};
|
|
struct net *net = sock_net(skb->sk);
|
|
struct net *tgt_net = net;
|
|
int h, s_h;
|
|
int idx, s_idx;
|
|
int s_ip_idx;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
struct hlist_head *head;
|
|
int err = 0;
|
|
|
|
s_h = cb->args[0];
|
|
s_idx = idx = cb->args[1];
|
|
s_ip_idx = cb->args[2];
|
|
|
|
if (cb->strict_check) {
|
|
err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
|
|
skb->sk, cb);
|
|
if (err < 0)
|
|
goto put_tgt_net;
|
|
|
|
err = 0;
|
|
if (fillargs.ifindex) {
|
|
dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto put_tgt_net;
|
|
}
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev) {
|
|
err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
|
|
&fillargs);
|
|
}
|
|
goto put_tgt_net;
|
|
}
|
|
}
|
|
|
|
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
|
|
idx = 0;
|
|
head = &tgt_net->dev_index_head[h];
|
|
rcu_read_lock();
|
|
cb->seq = atomic_read(&tgt_net->ipv4.dev_addr_genid) ^
|
|
tgt_net->dev_base_seq;
|
|
hlist_for_each_entry_rcu(dev, 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;
|
|
|
|
err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
|
|
&fillargs);
|
|
if (err < 0) {
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
cont:
|
|
idx++;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
done:
|
|
cb->args[0] = h;
|
|
cb->args[1] = idx;
|
|
put_tgt_net:
|
|
if (fillargs.netnsid >= 0)
|
|
put_net(tgt_net);
|
|
|
|
return skb->len ? : err;
|
|
}
|
|
|
|
static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
|
|
u32 portid)
|
|
{
|
|
struct inet_fill_args fillargs = {
|
|
.portid = portid,
|
|
.seq = nlh ? nlh->nlmsg_seq : 0,
|
|
.event = event,
|
|
.flags = 0,
|
|
.netnsid = -1,
|
|
};
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
struct net *net;
|
|
|
|
net = dev_net(ifa->ifa_dev->dev);
|
|
skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = inet_fill_ifaddr(skb, ifa, &fillargs);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in inet_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, portid, 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,
|
|
u32 ext_filter_mask)
|
|
{
|
|
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,
|
|
u32 ext_filter_mask)
|
|
{
|
|
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)
|
|
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_rcu(dev))
|
|
return -EAFNOSUPPORT;
|
|
|
|
err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
|
|
inet_af_policy, NULL);
|
|
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_rcu(dev);
|
|
struct nlattr *a, *tb[IFLA_INET_MAX+1];
|
|
int rem;
|
|
|
|
if (!in_dev)
|
|
return -EAFNOSUPPORT;
|
|
|
|
if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, 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;
|
|
}
|
|
|
|
static int inet_netconf_msgsize_devconf(int type)
|
|
{
|
|
int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
|
|
+ nla_total_size(4); /* NETCONFA_IFINDEX */
|
|
bool all = false;
|
|
|
|
if (type == NETCONFA_ALL)
|
|
all = true;
|
|
|
|
if (all || type == NETCONFA_FORWARDING)
|
|
size += nla_total_size(4);
|
|
if (all || type == NETCONFA_RP_FILTER)
|
|
size += nla_total_size(4);
|
|
if (all || type == NETCONFA_MC_FORWARDING)
|
|
size += nla_total_size(4);
|
|
if (all || type == NETCONFA_BC_FORWARDING)
|
|
size += nla_total_size(4);
|
|
if (all || type == NETCONFA_PROXY_NEIGH)
|
|
size += nla_total_size(4);
|
|
if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
|
|
size += nla_total_size(4);
|
|
|
|
return size;
|
|
}
|
|
|
|
static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
|
|
struct ipv4_devconf *devconf, u32 portid,
|
|
u32 seq, int event, unsigned int flags,
|
|
int type)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct netconfmsg *ncm;
|
|
bool all = false;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
|
|
flags);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
if (type == NETCONFA_ALL)
|
|
all = true;
|
|
|
|
ncm = nlmsg_data(nlh);
|
|
ncm->ncm_family = AF_INET;
|
|
|
|
if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (!devconf)
|
|
goto out;
|
|
|
|
if ((all || type == NETCONFA_FORWARDING) &&
|
|
nla_put_s32(skb, NETCONFA_FORWARDING,
|
|
IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
|
|
goto nla_put_failure;
|
|
if ((all || type == NETCONFA_RP_FILTER) &&
|
|
nla_put_s32(skb, NETCONFA_RP_FILTER,
|
|
IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
|
|
goto nla_put_failure;
|
|
if ((all || type == NETCONFA_MC_FORWARDING) &&
|
|
nla_put_s32(skb, NETCONFA_MC_FORWARDING,
|
|
IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
|
|
goto nla_put_failure;
|
|
if ((all || type == NETCONFA_BC_FORWARDING) &&
|
|
nla_put_s32(skb, NETCONFA_BC_FORWARDING,
|
|
IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
|
|
goto nla_put_failure;
|
|
if ((all || type == NETCONFA_PROXY_NEIGH) &&
|
|
nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
|
|
IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
|
|
goto nla_put_failure;
|
|
if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
|
|
nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
|
|
IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
|
|
goto nla_put_failure;
|
|
|
|
out:
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
void inet_netconf_notify_devconf(struct net *net, int event, int type,
|
|
int ifindex, struct ipv4_devconf *devconf)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
|
|
event, 0, type);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
|
|
}
|
|
|
|
static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
|
|
[NETCONFA_IFINDEX] = { .len = sizeof(int) },
|
|
[NETCONFA_FORWARDING] = { .len = sizeof(int) },
|
|
[NETCONFA_RP_FILTER] = { .len = sizeof(int) },
|
|
[NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
|
|
[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
|
|
};
|
|
|
|
static int inet_netconf_valid_get_req(struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
struct nlattr **tb,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int i, err;
|
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!netlink_strict_get_check(skb))
|
|
return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
|
|
tb, NETCONFA_MAX,
|
|
devconf_ipv4_policy, extack);
|
|
|
|
err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
|
|
tb, NETCONFA_MAX,
|
|
devconf_ipv4_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
for (i = 0; i <= NETCONFA_MAX; i++) {
|
|
if (!tb[i])
|
|
continue;
|
|
|
|
switch (i) {
|
|
case NETCONFA_IFINDEX:
|
|
break;
|
|
default:
|
|
NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int inet_netconf_get_devconf(struct sk_buff *in_skb,
|
|
struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(in_skb->sk);
|
|
struct nlattr *tb[NETCONFA_MAX+1];
|
|
struct sk_buff *skb;
|
|
struct ipv4_devconf *devconf;
|
|
struct in_device *in_dev;
|
|
struct net_device *dev;
|
|
int ifindex;
|
|
int err;
|
|
|
|
err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
|
|
if (err)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
if (!tb[NETCONFA_IFINDEX])
|
|
goto errout;
|
|
|
|
ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
|
|
switch (ifindex) {
|
|
case NETCONFA_IFINDEX_ALL:
|
|
devconf = net->ipv4.devconf_all;
|
|
break;
|
|
case NETCONFA_IFINDEX_DEFAULT:
|
|
devconf = net->ipv4.devconf_dflt;
|
|
break;
|
|
default:
|
|
dev = __dev_get_by_index(net, ifindex);
|
|
if (!dev)
|
|
goto errout;
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (!in_dev)
|
|
goto errout;
|
|
devconf = &in_dev->cnf;
|
|
break;
|
|
}
|
|
|
|
err = -ENOBUFS;
|
|
skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = inet_netconf_fill_devconf(skb, ifindex, devconf,
|
|
NETLINK_CB(in_skb).portid,
|
|
nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
|
|
NETCONFA_ALL);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static int inet_netconf_dump_devconf(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
const struct nlmsghdr *nlh = cb->nlh;
|
|
struct net *net = sock_net(skb->sk);
|
|
int h, s_h;
|
|
int idx, s_idx;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
struct hlist_head *head;
|
|
|
|
if (cb->strict_check) {
|
|
struct netlink_ext_ack *extack = cb->extack;
|
|
struct netconfmsg *ncm;
|
|
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
|
|
NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
s_h = cb->args[0];
|
|
s_idx = idx = cb->args[1];
|
|
|
|
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
|
|
idx = 0;
|
|
head = &net->dev_index_head[h];
|
|
rcu_read_lock();
|
|
cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
|
|
net->dev_base_seq;
|
|
hlist_for_each_entry_rcu(dev, head, index_hlist) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
goto cont;
|
|
|
|
if (inet_netconf_fill_devconf(skb, dev->ifindex,
|
|
&in_dev->cnf,
|
|
NETLINK_CB(cb->skb).portid,
|
|
nlh->nlmsg_seq,
|
|
RTM_NEWNETCONF,
|
|
NLM_F_MULTI,
|
|
NETCONFA_ALL) < 0) {
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
|
cont:
|
|
idx++;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
if (h == NETDEV_HASHENTRIES) {
|
|
if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
|
|
net->ipv4.devconf_all,
|
|
NETLINK_CB(cb->skb).portid,
|
|
nlh->nlmsg_seq,
|
|
RTM_NEWNETCONF, NLM_F_MULTI,
|
|
NETCONFA_ALL) < 0)
|
|
goto done;
|
|
else
|
|
h++;
|
|
}
|
|
if (h == NETDEV_HASHENTRIES + 1) {
|
|
if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
|
|
net->ipv4.devconf_dflt,
|
|
NETLINK_CB(cb->skb).portid,
|
|
nlh->nlmsg_seq,
|
|
RTM_NEWNETCONF, NLM_F_MULTI,
|
|
NETCONFA_ALL) < 0)
|
|
goto done;
|
|
else
|
|
h++;
|
|
}
|
|
done:
|
|
cb->args[0] = h;
|
|
cb->args[1] = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
#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;
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_FORWARDING,
|
|
NETCONFA_IFINDEX_ALL,
|
|
net->ipv4.devconf_all);
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_FORWARDING,
|
|
NETCONFA_IFINDEX_DEFAULT,
|
|
net->ipv4.devconf_dflt);
|
|
|
|
for_each_netdev(net, dev) {
|
|
struct in_device *in_dev;
|
|
|
|
if (on)
|
|
dev_disable_lro(dev);
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev) {
|
|
IN_DEV_CONF_SET(in_dev, FORWARDING, on);
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_FORWARDING,
|
|
dev->ifindex, &in_dev->cnf);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
|
|
{
|
|
if (cnf == net->ipv4.devconf_dflt)
|
|
return NETCONFA_IFINDEX_DEFAULT;
|
|
else if (cnf == net->ipv4.devconf_all)
|
|
return NETCONFA_IFINDEX_ALL;
|
|
else {
|
|
struct in_device *idev
|
|
= container_of(cnf, struct in_device, cnf);
|
|
return idev->dev->ifindex;
|
|
}
|
|
}
|
|
|
|
static int devinet_conf_proc(struct 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;
|
|
int ifindex;
|
|
|
|
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);
|
|
|
|
if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
|
|
new_value != old_value)
|
|
rt_cache_flush(net);
|
|
|
|
if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
|
|
new_value != old_value) {
|
|
ifindex = devinet_conf_ifindex(net, cnf);
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_RP_FILTER,
|
|
ifindex, cnf);
|
|
}
|
|
if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
|
|
new_value != old_value) {
|
|
ifindex = devinet_conf_ifindex(net, cnf);
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_PROXY_NEIGH,
|
|
ifindex, cnf);
|
|
}
|
|
if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
|
|
new_value != old_value) {
|
|
ifindex = devinet_conf_ifindex(net, cnf);
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
|
|
ifindex, cnf);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int devinet_sysctl_forward(struct 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 {
|
|
struct ipv4_devconf *cnf = ctl->extra1;
|
|
struct in_device *idev =
|
|
container_of(cnf, struct in_device, cnf);
|
|
if (*valp)
|
|
dev_disable_lro(idev->dev);
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_FORWARDING,
|
|
idev->dev->ifindex,
|
|
cnf);
|
|
}
|
|
rtnl_unlock();
|
|
rt_cache_flush(net);
|
|
} else
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
|
|
NETCONFA_FORWARDING,
|
|
NETCONFA_IFINDEX_DEFAULT,
|
|
net->ipv4.devconf_dflt);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ipv4_doint_and_flush(struct 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);
|
|
|
|
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(BC_FORWARDING, "bc_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_RW_ENTRY(FORCE_IGMP_VERSION,
|
|
"force_igmp_version"),
|
|
DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
|
|
"igmpv2_unsolicited_report_interval"),
|
|
DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
|
|
"igmpv3_unsolicited_report_interval"),
|
|
DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
|
|
"ignore_routes_with_linkdown"),
|
|
DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
|
|
"drop_gratuitous_arp"),
|
|
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
|
|
"promote_secondaries"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
|
|
"route_localnet"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
|
|
"drop_unicast_in_l2_multicast"),
|
|
},
|
|
};
|
|
|
|
static int __devinet_sysctl_register(struct net *net, char *dev_name,
|
|
int ifindex, 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;
|
|
|
|
inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
|
|
ifindex, p);
|
|
return 0;
|
|
|
|
free:
|
|
kfree(t);
|
|
out:
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
static void __devinet_sysctl_unregister(struct net *net,
|
|
struct ipv4_devconf *cnf, int ifindex)
|
|
{
|
|
struct devinet_sysctl_table *t = cnf->sysctl;
|
|
|
|
if (t) {
|
|
cnf->sysctl = NULL;
|
|
unregister_net_sysctl_table(t->sysctl_header);
|
|
kfree(t);
|
|
}
|
|
|
|
inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
|
|
}
|
|
|
|
static int devinet_sysctl_register(struct in_device *idev)
|
|
{
|
|
int err;
|
|
|
|
if (!sysctl_dev_name_is_allowed(idev->dev->name))
|
|
return -EINVAL;
|
|
|
|
err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
|
|
if (err)
|
|
return err;
|
|
err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
|
|
idev->dev->ifindex, &idev->cnf);
|
|
if (err)
|
|
neigh_sysctl_unregister(idev->arp_parms);
|
|
return err;
|
|
}
|
|
|
|
static void devinet_sysctl_unregister(struct in_device *idev)
|
|
{
|
|
struct net *net = dev_net(idev->dev);
|
|
|
|
__devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
|
|
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;
|
|
struct ctl_table_header *forw_hdr;
|
|
#endif
|
|
|
|
err = -ENOMEM;
|
|
all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
|
|
if (!all)
|
|
goto err_alloc_all;
|
|
|
|
dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
|
|
if (!dflt)
|
|
goto err_alloc_dflt;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
|
|
if (!tbl)
|
|
goto err_alloc_ctl;
|
|
|
|
tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
|
|
tbl[0].extra1 = all;
|
|
tbl[0].extra2 = net;
|
|
#endif
|
|
|
|
if ((!IS_ENABLED(CONFIG_SYSCTL) ||
|
|
sysctl_devconf_inherit_init_net != 2) &&
|
|
!net_eq(net, &init_net)) {
|
|
memcpy(all, init_net.ipv4.devconf_all, sizeof(ipv4_devconf));
|
|
memcpy(dflt, init_net.ipv4.devconf_dflt, sizeof(ipv4_devconf_dflt));
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
|
|
if (err < 0)
|
|
goto err_reg_all;
|
|
|
|
err = __devinet_sysctl_register(net, "default",
|
|
NETCONFA_IFINDEX_DEFAULT, dflt);
|
|
if (err < 0)
|
|
goto err_reg_dflt;
|
|
|
|
err = -ENOMEM;
|
|
forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
|
|
if (!forw_hdr)
|
|
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(net, dflt, NETCONFA_IFINDEX_DEFAULT);
|
|
err_reg_dflt:
|
|
__devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
|
|
err_reg_all:
|
|
kfree(tbl);
|
|
err_alloc_ctl:
|
|
#endif
|
|
kfree(dflt);
|
|
err_alloc_dflt:
|
|
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, net->ipv4.devconf_dflt,
|
|
NETCONFA_IFINDEX_DEFAULT);
|
|
__devinet_sysctl_unregister(net, net->ipv4.devconf_all,
|
|
NETCONFA_IFINDEX_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 __read_mostly = {
|
|
.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);
|
|
|
|
queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
|
|
|
|
rtnl_af_register(&inet_af_ops);
|
|
|
|
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
|
|
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
|
|
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
|
|
rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
|
|
inet_netconf_dump_devconf, 0);
|
|
}
|