![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
1632 lines
38 KiB
C
1632 lines
38 KiB
C
/*
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* NET3 IP device support routines.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Derived from the IP parts of dev.c 1.0.19
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Mark Evans, <evansmp@uhura.aston.ac.uk>
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*
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* Additional Authors:
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Changes:
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* Alexey Kuznetsov: pa_* fields are replaced with ifaddr
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* lists.
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* Cyrus Durgin: updated for kmod
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* Matthias Andree: in devinet_ioctl, compare label and
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* address (4.4BSD alias style support),
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* fall back to comparing just the label
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* if no match found.
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*/
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_addr.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/notifier.h>
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#include <linux/inetdevice.h>
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#include <linux/igmp.h>
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#include <linux/slab.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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#endif
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#include <linux/kmod.h>
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#include <net/arp.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/ip_fib.h>
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#include <net/rtnetlink.h>
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#include <net/net_namespace.h>
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static struct ipv4_devconf ipv4_devconf = {
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.data = {
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[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
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},
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};
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static struct ipv4_devconf ipv4_devconf_dflt = {
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.data = {
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[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
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[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
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[IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
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},
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};
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#define IPV4_DEVCONF_DFLT(net, attr) \
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IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
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static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
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[IFA_LOCAL] = { .type = NLA_U32 },
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[IFA_ADDRESS] = { .type = NLA_U32 },
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[IFA_BROADCAST] = { .type = NLA_U32 },
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[IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
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};
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static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
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static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
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static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
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int destroy);
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#ifdef CONFIG_SYSCTL
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static void devinet_sysctl_register(struct in_device *idev);
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static void devinet_sysctl_unregister(struct in_device *idev);
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#else
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static inline void devinet_sysctl_register(struct in_device *idev)
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{
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}
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static inline 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 inline void inet_free_ifa(struct in_ifaddr *ifa)
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{
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call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
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}
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void in_dev_finish_destroy(struct in_device *idev)
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{
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struct net_device *dev = idev->dev;
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WARN_ON(idev->ifa_list);
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WARN_ON(idev->mc_list);
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#ifdef NET_REFCNT_DEBUG
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printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
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idev, dev ? dev->name : "NIL");
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#endif
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dev_put(dev);
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if (!idev->dead)
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pr_err("Freeing alive in_device %p\n", idev);
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else
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kfree(idev);
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}
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EXPORT_SYMBOL(in_dev_finish_destroy);
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static struct in_device *inetdev_init(struct net_device *dev)
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{
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struct in_device *in_dev;
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ASSERT_RTNL();
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in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
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if (!in_dev)
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goto out;
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memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
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sizeof(in_dev->cnf));
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in_dev->cnf.sysctl = NULL;
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in_dev->dev = dev;
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in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
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if (!in_dev->arp_parms)
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goto out_kfree;
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if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
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dev_disable_lro(dev);
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/* Reference in_dev->dev */
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dev_hold(dev);
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/* Account for reference dev->ip_ptr (below) */
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in_dev_hold(in_dev);
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devinet_sysctl_register(in_dev);
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ip_mc_init_dev(in_dev);
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if (dev->flags & IFF_UP)
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ip_mc_up(in_dev);
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/* we can receive as soon as ip_ptr is set -- do this last */
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rcu_assign_pointer(dev->ip_ptr, in_dev);
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out:
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return in_dev;
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out_kfree:
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kfree(in_dev);
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in_dev = NULL;
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goto out;
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}
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static void in_dev_rcu_put(struct rcu_head *head)
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{
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struct in_device *idev = container_of(head, struct in_device, rcu_head);
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in_dev_put(idev);
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}
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static void inetdev_destroy(struct in_device *in_dev)
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{
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struct in_ifaddr *ifa;
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struct net_device *dev;
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ASSERT_RTNL();
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dev = in_dev->dev;
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in_dev->dead = 1;
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ip_mc_destroy_dev(in_dev);
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while ((ifa = in_dev->ifa_list) != NULL) {
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inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
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inet_free_ifa(ifa);
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}
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dev->ip_ptr = NULL;
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devinet_sysctl_unregister(in_dev);
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neigh_parms_release(&arp_tbl, in_dev->arp_parms);
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arp_ifdown(dev);
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call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
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}
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int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
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{
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rcu_read_lock();
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for_primary_ifa(in_dev) {
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if (inet_ifa_match(a, ifa)) {
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if (!b || inet_ifa_match(b, ifa)) {
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rcu_read_unlock();
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return 1;
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}
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}
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} endfor_ifa(in_dev);
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rcu_read_unlock();
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return 0;
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}
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static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
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int destroy, struct nlmsghdr *nlh, u32 pid)
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{
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struct in_ifaddr *promote = NULL;
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struct in_ifaddr *ifa, *ifa1 = *ifap;
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struct in_ifaddr *last_prim = in_dev->ifa_list;
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struct in_ifaddr *prev_prom = NULL;
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int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
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ASSERT_RTNL();
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/* 1. Deleting primary ifaddr forces deletion all secondaries
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* unless alias promotion is set
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**/
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if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
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struct in_ifaddr **ifap1 = &ifa1->ifa_next;
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while ((ifa = *ifap1) != NULL) {
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if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
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ifa1->ifa_scope <= ifa->ifa_scope)
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last_prim = ifa;
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if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
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ifa1->ifa_mask != ifa->ifa_mask ||
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!inet_ifa_match(ifa1->ifa_address, ifa)) {
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ifap1 = &ifa->ifa_next;
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prev_prom = ifa;
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continue;
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}
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if (!do_promote) {
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*ifap1 = ifa->ifa_next;
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rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain,
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NETDEV_DOWN, ifa);
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inet_free_ifa(ifa);
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} else {
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promote = ifa;
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break;
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}
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}
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}
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/* 2. Unlink it */
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*ifap = ifa1->ifa_next;
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/* 3. Announce address deletion */
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/* Send message first, then call notifier.
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At first sight, FIB update triggered by notifier
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will refer to already deleted ifaddr, that could confuse
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netlink listeners. It is not true: look, gated sees
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that route deleted and if it still thinks that ifaddr
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is valid, it will try to restore deleted routes... Grr.
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So that, this order is correct.
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*/
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rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
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if (promote) {
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if (prev_prom) {
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prev_prom->ifa_next = promote->ifa_next;
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promote->ifa_next = last_prim->ifa_next;
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last_prim->ifa_next = promote;
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}
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promote->ifa_flags &= ~IFA_F_SECONDARY;
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rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain,
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NETDEV_UP, promote);
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for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
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if (ifa1->ifa_mask != ifa->ifa_mask ||
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!inet_ifa_match(ifa1->ifa_address, ifa))
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continue;
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fib_add_ifaddr(ifa);
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}
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}
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if (destroy)
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inet_free_ifa(ifa1);
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}
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static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
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int destroy)
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{
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__inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
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}
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static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
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u32 pid)
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{
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struct in_device *in_dev = ifa->ifa_dev;
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struct in_ifaddr *ifa1, **ifap, **last_primary;
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ASSERT_RTNL();
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if (!ifa->ifa_local) {
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inet_free_ifa(ifa);
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return 0;
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}
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ifa->ifa_flags &= ~IFA_F_SECONDARY;
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last_primary = &in_dev->ifa_list;
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for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
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ifap = &ifa1->ifa_next) {
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if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
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ifa->ifa_scope <= ifa1->ifa_scope)
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last_primary = &ifa1->ifa_next;
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if (ifa1->ifa_mask == ifa->ifa_mask &&
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inet_ifa_match(ifa1->ifa_address, ifa)) {
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if (ifa1->ifa_local == ifa->ifa_local) {
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inet_free_ifa(ifa);
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return -EEXIST;
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}
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if (ifa1->ifa_scope != ifa->ifa_scope) {
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inet_free_ifa(ifa);
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return -EINVAL;
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}
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ifa->ifa_flags |= IFA_F_SECONDARY;
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}
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}
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if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
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net_srandom(ifa->ifa_local);
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ifap = last_primary;
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}
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ifa->ifa_next = *ifap;
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*ifap = ifa;
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/* Send message first, then call notifier.
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Notifier will trigger FIB update, so that
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listeners of netlink will know about new ifaddr */
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rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
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blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
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return 0;
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}
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static int inet_insert_ifa(struct in_ifaddr *ifa)
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{
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return __inet_insert_ifa(ifa, NULL, 0);
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}
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static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
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{
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struct in_device *in_dev = __in_dev_get_rtnl(dev);
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ASSERT_RTNL();
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if (!in_dev) {
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inet_free_ifa(ifa);
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return -ENOBUFS;
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}
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ipv4_devconf_setall(in_dev);
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if (ifa->ifa_dev != in_dev) {
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WARN_ON(ifa->ifa_dev);
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in_dev_hold(in_dev);
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ifa->ifa_dev = in_dev;
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}
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if (ipv4_is_loopback(ifa->ifa_local))
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ifa->ifa_scope = RT_SCOPE_HOST;
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return inet_insert_ifa(ifa);
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}
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struct in_device *inetdev_by_index(struct net *net, int ifindex)
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{
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struct net_device *dev;
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struct in_device *in_dev = NULL;
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, ifindex);
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if (dev)
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in_dev = in_dev_get(dev);
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rcu_read_unlock();
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return in_dev;
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}
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EXPORT_SYMBOL(inetdev_by_index);
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/* Called only from RTNL semaphored context. No locks. */
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struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
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__be32 mask)
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{
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ASSERT_RTNL();
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|
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for_primary_ifa(in_dev) {
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if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
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return ifa;
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} endfor_ifa(in_dev);
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return NULL;
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}
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|
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static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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|
{
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struct net *net = sock_net(skb->sk);
|
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struct nlattr *tb[IFA_MAX+1];
|
|
struct in_device *in_dev;
|
|
struct ifaddrmsg *ifm;
|
|
struct in_ifaddr *ifa, **ifap;
|
|
int err = -EINVAL;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
in_dev = inetdev_by_index(net, ifm->ifa_index);
|
|
if (in_dev == NULL) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
__in_dev_put(in_dev);
|
|
|
|
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
|
|
ifap = &ifa->ifa_next) {
|
|
if (tb[IFA_LOCAL] &&
|
|
ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
|
|
continue;
|
|
|
|
if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
|
|
continue;
|
|
|
|
if (tb[IFA_ADDRESS] &&
|
|
(ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
|
|
!inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
|
|
continue;
|
|
|
|
__inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
|
|
return 0;
|
|
}
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
|
|
{
|
|
struct nlattr *tb[IFA_MAX+1];
|
|
struct in_ifaddr *ifa;
|
|
struct ifaddrmsg *ifm;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
err = -EINVAL;
|
|
if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
|
|
goto errout;
|
|
|
|
dev = __dev_get_by_index(net, ifm->ifa_index);
|
|
err = -ENODEV;
|
|
if (dev == NULL)
|
|
goto errout;
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
err = -ENOBUFS;
|
|
if (in_dev == NULL)
|
|
goto errout;
|
|
|
|
ifa = inet_alloc_ifa();
|
|
if (ifa == NULL)
|
|
/*
|
|
* A potential indev allocation can be left alive, it stays
|
|
* assigned to its device and is destroy with it.
|
|
*/
|
|
goto errout;
|
|
|
|
ipv4_devconf_setall(in_dev);
|
|
in_dev_hold(in_dev);
|
|
|
|
if (tb[IFA_ADDRESS] == NULL)
|
|
tb[IFA_ADDRESS] = tb[IFA_LOCAL];
|
|
|
|
ifa->ifa_prefixlen = ifm->ifa_prefixlen;
|
|
ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
|
|
ifa->ifa_flags = ifm->ifa_flags;
|
|
ifa->ifa_scope = ifm->ifa_scope;
|
|
ifa->ifa_dev = in_dev;
|
|
|
|
ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
|
|
ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
|
|
|
|
if (tb[IFA_BROADCAST])
|
|
ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
|
|
|
|
if (tb[IFA_LABEL])
|
|
nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
|
|
else
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
|
|
return ifa;
|
|
|
|
errout:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct in_ifaddr *ifa;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
ifa = rtm_to_ifaddr(net, nlh);
|
|
if (IS_ERR(ifa))
|
|
return PTR_ERR(ifa);
|
|
|
|
return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
|
|
}
|
|
|
|
/*
|
|
* Determine a default network mask, based on the IP address.
|
|
*/
|
|
|
|
static inline int inet_abc_len(__be32 addr)
|
|
{
|
|
int rc = -1; /* Something else, probably a multicast. */
|
|
|
|
if (ipv4_is_zeronet(addr))
|
|
rc = 0;
|
|
else {
|
|
__u32 haddr = ntohl(addr);
|
|
|
|
if (IN_CLASSA(haddr))
|
|
rc = 8;
|
|
else if (IN_CLASSB(haddr))
|
|
rc = 16;
|
|
else if (IN_CLASSC(haddr))
|
|
rc = 24;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct ifreq ifr;
|
|
struct sockaddr_in sin_orig;
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
|
|
struct in_device *in_dev;
|
|
struct in_ifaddr **ifap = NULL;
|
|
struct in_ifaddr *ifa = NULL;
|
|
struct net_device *dev;
|
|
char *colon;
|
|
int ret = -EFAULT;
|
|
int tryaddrmatch = 0;
|
|
|
|
/*
|
|
* Fetch the caller's info block into kernel space
|
|
*/
|
|
|
|
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
|
|
goto out;
|
|
ifr.ifr_name[IFNAMSIZ - 1] = 0;
|
|
|
|
/* save original address for comparison */
|
|
memcpy(&sin_orig, sin, sizeof(*sin));
|
|
|
|
colon = strchr(ifr.ifr_name, ':');
|
|
if (colon)
|
|
*colon = 0;
|
|
|
|
dev_load(net, ifr.ifr_name);
|
|
|
|
switch (cmd) {
|
|
case SIOCGIFADDR: /* Get interface address */
|
|
case SIOCGIFBRDADDR: /* Get the broadcast address */
|
|
case SIOCGIFDSTADDR: /* Get the destination address */
|
|
case SIOCGIFNETMASK: /* Get the netmask for the interface */
|
|
/* Note that these ioctls will not sleep,
|
|
so that we do not impose a lock.
|
|
One day we will be forced to put shlock here (I mean SMP)
|
|
*/
|
|
tryaddrmatch = (sin_orig.sin_family == AF_INET);
|
|
memset(sin, 0, sizeof(*sin));
|
|
sin->sin_family = AF_INET;
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
ret = -EACCES;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
goto out;
|
|
break;
|
|
case SIOCSIFADDR: /* Set interface address (and family) */
|
|
case SIOCSIFBRDADDR: /* Set the broadcast address */
|
|
case SIOCSIFDSTADDR: /* Set the destination address */
|
|
case SIOCSIFNETMASK: /* Set the netmask for the interface */
|
|
ret = -EACCES;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
goto out;
|
|
ret = -EINVAL;
|
|
if (sin->sin_family != AF_INET)
|
|
goto out;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
rtnl_lock();
|
|
|
|
ret = -ENODEV;
|
|
dev = __dev_get_by_name(net, ifr.ifr_name);
|
|
if (!dev)
|
|
goto done;
|
|
|
|
if (colon)
|
|
*colon = ':';
|
|
|
|
in_dev = __in_dev_get_rtnl(dev);
|
|
if (in_dev) {
|
|
if (tryaddrmatch) {
|
|
/* Matthias Andree */
|
|
/* compare label and address (4.4BSD style) */
|
|
/* note: we only do this for a limited set of ioctls
|
|
and only if the original address family was AF_INET.
|
|
This is checked above. */
|
|
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
|
|
ifap = &ifa->ifa_next) {
|
|
if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
|
|
sin_orig.sin_addr.s_addr ==
|
|
ifa->ifa_address) {
|
|
break; /* found */
|
|
}
|
|
}
|
|
}
|
|
/* we didn't get a match, maybe the application is
|
|
4.3BSD-style and passed in junk so we fall back to
|
|
comparing just the label */
|
|
if (!ifa) {
|
|
for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
|
|
ifap = &ifa->ifa_next)
|
|
if (!strcmp(ifr.ifr_name, ifa->ifa_label))
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret = -EADDRNOTAVAIL;
|
|
if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
|
|
goto done;
|
|
|
|
switch (cmd) {
|
|
case SIOCGIFADDR: /* Get interface address */
|
|
sin->sin_addr.s_addr = ifa->ifa_local;
|
|
goto rarok;
|
|
|
|
case SIOCGIFBRDADDR: /* Get the broadcast address */
|
|
sin->sin_addr.s_addr = ifa->ifa_broadcast;
|
|
goto rarok;
|
|
|
|
case SIOCGIFDSTADDR: /* Get the destination address */
|
|
sin->sin_addr.s_addr = ifa->ifa_address;
|
|
goto rarok;
|
|
|
|
case SIOCGIFNETMASK: /* Get the netmask for the interface */
|
|
sin->sin_addr.s_addr = ifa->ifa_mask;
|
|
goto rarok;
|
|
|
|
case SIOCSIFFLAGS:
|
|
if (colon) {
|
|
ret = -EADDRNOTAVAIL;
|
|
if (!ifa)
|
|
break;
|
|
ret = 0;
|
|
if (!(ifr.ifr_flags & IFF_UP))
|
|
inet_del_ifa(in_dev, ifap, 1);
|
|
break;
|
|
}
|
|
ret = dev_change_flags(dev, ifr.ifr_flags);
|
|
break;
|
|
|
|
case SIOCSIFADDR: /* Set interface address (and family) */
|
|
ret = -EINVAL;
|
|
if (inet_abc_len(sin->sin_addr.s_addr) < 0)
|
|
break;
|
|
|
|
if (!ifa) {
|
|
ret = -ENOBUFS;
|
|
ifa = inet_alloc_ifa();
|
|
if (!ifa)
|
|
break;
|
|
if (colon)
|
|
memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
|
|
else
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
} else {
|
|
ret = 0;
|
|
if (ifa->ifa_local == sin->sin_addr.s_addr)
|
|
break;
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_broadcast = 0;
|
|
ifa->ifa_scope = 0;
|
|
}
|
|
|
|
ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
|
|
|
|
if (!(dev->flags & IFF_POINTOPOINT)) {
|
|
ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
|
|
ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
|
|
if ((dev->flags & IFF_BROADCAST) &&
|
|
ifa->ifa_prefixlen < 31)
|
|
ifa->ifa_broadcast = ifa->ifa_address |
|
|
~ifa->ifa_mask;
|
|
} else {
|
|
ifa->ifa_prefixlen = 32;
|
|
ifa->ifa_mask = inet_make_mask(32);
|
|
}
|
|
ret = inet_set_ifa(dev, ifa);
|
|
break;
|
|
|
|
case SIOCSIFBRDADDR: /* Set the broadcast address */
|
|
ret = 0;
|
|
if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_broadcast = sin->sin_addr.s_addr;
|
|
inet_insert_ifa(ifa);
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFDSTADDR: /* Set the destination address */
|
|
ret = 0;
|
|
if (ifa->ifa_address == sin->sin_addr.s_addr)
|
|
break;
|
|
ret = -EINVAL;
|
|
if (inet_abc_len(sin->sin_addr.s_addr) < 0)
|
|
break;
|
|
ret = 0;
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_address = sin->sin_addr.s_addr;
|
|
inet_insert_ifa(ifa);
|
|
break;
|
|
|
|
case SIOCSIFNETMASK: /* Set the netmask for the interface */
|
|
|
|
/*
|
|
* The mask we set must be legal.
|
|
*/
|
|
ret = -EINVAL;
|
|
if (bad_mask(sin->sin_addr.s_addr, 0))
|
|
break;
|
|
ret = 0;
|
|
if (ifa->ifa_mask != sin->sin_addr.s_addr) {
|
|
__be32 old_mask = ifa->ifa_mask;
|
|
inet_del_ifa(in_dev, ifap, 0);
|
|
ifa->ifa_mask = sin->sin_addr.s_addr;
|
|
ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
|
|
|
|
/* See if current broadcast address matches
|
|
* with current netmask, then recalculate
|
|
* the broadcast address. Otherwise it's a
|
|
* funny address, so don't touch it since
|
|
* the user seems to know what (s)he's doing...
|
|
*/
|
|
if ((dev->flags & IFF_BROADCAST) &&
|
|
(ifa->ifa_prefixlen < 31) &&
|
|
(ifa->ifa_broadcast ==
|
|
(ifa->ifa_local|~old_mask))) {
|
|
ifa->ifa_broadcast = (ifa->ifa_local |
|
|
~sin->sin_addr.s_addr);
|
|
}
|
|
inet_insert_ifa(ifa);
|
|
}
|
|
break;
|
|
}
|
|
done:
|
|
rtnl_unlock();
|
|
out:
|
|
return ret;
|
|
rarok:
|
|
rtnl_unlock();
|
|
ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
|
|
goto out;
|
|
}
|
|
|
|
static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
|
|
{
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
struct in_ifaddr *ifa;
|
|
struct ifreq ifr;
|
|
int done = 0;
|
|
|
|
if (!in_dev)
|
|
goto out;
|
|
|
|
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
|
|
if (!buf) {
|
|
done += sizeof(ifr);
|
|
continue;
|
|
}
|
|
if (len < (int) sizeof(ifr))
|
|
break;
|
|
memset(&ifr, 0, sizeof(struct ifreq));
|
|
if (ifa->ifa_label)
|
|
strcpy(ifr.ifr_name, ifa->ifa_label);
|
|
else
|
|
strcpy(ifr.ifr_name, dev->name);
|
|
|
|
(*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
|
|
(*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
|
|
ifa->ifa_local;
|
|
|
|
if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
|
|
done = -EFAULT;
|
|
break;
|
|
}
|
|
buf += sizeof(struct ifreq);
|
|
len -= sizeof(struct ifreq);
|
|
done += sizeof(struct ifreq);
|
|
}
|
|
out:
|
|
return done;
|
|
}
|
|
|
|
__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
|
|
{
|
|
__be32 addr = 0;
|
|
struct in_device *in_dev;
|
|
struct net *net = dev_net(dev);
|
|
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
goto no_in_dev;
|
|
|
|
for_primary_ifa(in_dev) {
|
|
if (ifa->ifa_scope > scope)
|
|
continue;
|
|
if (!dst || inet_ifa_match(dst, ifa)) {
|
|
addr = ifa->ifa_local;
|
|
break;
|
|
}
|
|
if (!addr)
|
|
addr = ifa->ifa_local;
|
|
} endfor_ifa(in_dev);
|
|
|
|
if (addr)
|
|
goto out_unlock;
|
|
no_in_dev:
|
|
|
|
/* Not loopback addresses on loopback should be preferred
|
|
in this case. It is importnat that lo is the first interface
|
|
in dev_base list.
|
|
*/
|
|
for_each_netdev_rcu(net, dev) {
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
continue;
|
|
|
|
for_primary_ifa(in_dev) {
|
|
if (ifa->ifa_scope != RT_SCOPE_LINK &&
|
|
ifa->ifa_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
goto out_unlock;
|
|
}
|
|
} endfor_ifa(in_dev);
|
|
}
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
return addr;
|
|
}
|
|
EXPORT_SYMBOL(inet_select_addr);
|
|
|
|
static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
|
|
__be32 local, int scope)
|
|
{
|
|
int same = 0;
|
|
__be32 addr = 0;
|
|
|
|
for_ifa(in_dev) {
|
|
if (!addr &&
|
|
(local == ifa->ifa_local || !local) &&
|
|
ifa->ifa_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
if (same)
|
|
break;
|
|
}
|
|
if (!same) {
|
|
same = (!local || inet_ifa_match(local, ifa)) &&
|
|
(!dst || inet_ifa_match(dst, ifa));
|
|
if (same && addr) {
|
|
if (local || !dst)
|
|
break;
|
|
/* Is the selected addr into dst subnet? */
|
|
if (inet_ifa_match(addr, ifa))
|
|
break;
|
|
/* No, then can we use new local src? */
|
|
if (ifa->ifa_scope <= scope) {
|
|
addr = ifa->ifa_local;
|
|
break;
|
|
}
|
|
/* search for large dst subnet for addr */
|
|
same = 0;
|
|
}
|
|
}
|
|
} endfor_ifa(in_dev);
|
|
|
|
return same ? addr : 0;
|
|
}
|
|
|
|
/*
|
|
* Confirm that local IP address exists using wildcards:
|
|
* - in_dev: only on this interface, 0=any interface
|
|
* - dst: only in the same subnet as dst, 0=any dst
|
|
* - local: address, 0=autoselect the local address
|
|
* - scope: maximum allowed scope value for the local address
|
|
*/
|
|
__be32 inet_confirm_addr(struct in_device *in_dev,
|
|
__be32 dst, __be32 local, int scope)
|
|
{
|
|
__be32 addr = 0;
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
|
|
if (scope != RT_SCOPE_LINK)
|
|
return confirm_addr_indev(in_dev, dst, local, scope);
|
|
|
|
net = dev_net(in_dev->dev);
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev) {
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev) {
|
|
addr = confirm_addr_indev(in_dev, dst, local, scope);
|
|
if (addr)
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return addr;
|
|
}
|
|
|
|
/*
|
|
* Device notifier
|
|
*/
|
|
|
|
int register_inetaddr_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&inetaddr_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(register_inetaddr_notifier);
|
|
|
|
int unregister_inetaddr_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_inetaddr_notifier);
|
|
|
|
/* Rename ifa_labels for a device name change. Make some effort to preserve
|
|
* existing alias numbering and to create unique labels if possible.
|
|
*/
|
|
static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
|
|
{
|
|
struct in_ifaddr *ifa;
|
|
int named = 0;
|
|
|
|
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
|
|
char old[IFNAMSIZ], *dot;
|
|
|
|
memcpy(old, ifa->ifa_label, IFNAMSIZ);
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
if (named++ == 0)
|
|
goto skip;
|
|
dot = strchr(old, ':');
|
|
if (dot == NULL) {
|
|
sprintf(old, ":%d", named);
|
|
dot = old;
|
|
}
|
|
if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
|
|
strcat(ifa->ifa_label, dot);
|
|
else
|
|
strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
|
|
skip:
|
|
rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
|
|
}
|
|
}
|
|
|
|
static inline bool inetdev_valid_mtu(unsigned mtu)
|
|
{
|
|
return mtu >= 68;
|
|
}
|
|
|
|
/* Called only under RTNL semaphore */
|
|
|
|
static int inetdev_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
struct in_device *in_dev = __in_dev_get_rtnl(dev);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!in_dev) {
|
|
if (event == NETDEV_REGISTER) {
|
|
in_dev = inetdev_init(dev);
|
|
if (!in_dev)
|
|
return notifier_from_errno(-ENOMEM);
|
|
if (dev->flags & IFF_LOOPBACK) {
|
|
IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
|
|
IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
|
|
}
|
|
} else if (event == NETDEV_CHANGEMTU) {
|
|
/* Re-enabling IP */
|
|
if (inetdev_valid_mtu(dev->mtu))
|
|
in_dev = inetdev_init(dev);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
printk(KERN_DEBUG "inetdev_event: bug\n");
|
|
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) {
|
|
ifa->ifa_local =
|
|
ifa->ifa_address = htonl(INADDR_LOOPBACK);
|
|
ifa->ifa_prefixlen = 8;
|
|
ifa->ifa_mask = inet_make_mask(8);
|
|
in_dev_hold(in_dev);
|
|
ifa->ifa_dev = in_dev;
|
|
ifa->ifa_scope = RT_SCOPE_HOST;
|
|
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
|
|
inet_insert_ifa(ifa);
|
|
}
|
|
}
|
|
ip_mc_up(in_dev);
|
|
/* fall through */
|
|
case NETDEV_CHANGEADDR:
|
|
/* Send gratuitous ARP to notify of link change */
|
|
if (IN_DEV_ARP_NOTIFY(in_dev)) {
|
|
struct in_ifaddr *ifa = in_dev->ifa_list;
|
|
|
|
if (ifa)
|
|
arp_send(ARPOP_REQUEST, ETH_P_ARP,
|
|
ifa->ifa_address, dev,
|
|
ifa->ifa_address, NULL,
|
|
dev->dev_addr, NULL);
|
|
}
|
|
break;
|
|
case NETDEV_DOWN:
|
|
ip_mc_down(in_dev);
|
|
break;
|
|
case NETDEV_BONDING_OLDTYPE:
|
|
ip_mc_unmap(in_dev);
|
|
break;
|
|
case NETDEV_BONDING_NEWTYPE:
|
|
ip_mc_remap(in_dev);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
if (inetdev_valid_mtu(dev->mtu))
|
|
break;
|
|
/* disable IP when MTU is not enough */
|
|
case NETDEV_UNREGISTER:
|
|
inetdev_destroy(in_dev);
|
|
break;
|
|
case NETDEV_CHANGENAME:
|
|
/* Do not notify about label change, this event is
|
|
* not interesting to applications using netlink.
|
|
*/
|
|
inetdev_changename(dev, in_dev);
|
|
|
|
devinet_sysctl_unregister(in_dev);
|
|
devinet_sysctl_register(in_dev);
|
|
break;
|
|
}
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ip_netdev_notifier = {
|
|
.notifier_call = inetdev_event,
|
|
};
|
|
|
|
static inline size_t inet_nlmsg_size(void)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
|
|
+ nla_total_size(4) /* IFA_ADDRESS */
|
|
+ nla_total_size(4) /* IFA_LOCAL */
|
|
+ nla_total_size(4) /* IFA_BROADCAST */
|
|
+ nla_total_size(IFNAMSIZ); /* IFA_LABEL */
|
|
}
|
|
|
|
static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
|
|
u32 pid, u32 seq, int event, unsigned int flags)
|
|
{
|
|
struct ifaddrmsg *ifm;
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
ifm->ifa_family = AF_INET;
|
|
ifm->ifa_prefixlen = ifa->ifa_prefixlen;
|
|
ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
|
|
ifm->ifa_scope = ifa->ifa_scope;
|
|
ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
|
|
|
|
if (ifa->ifa_address)
|
|
NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
|
|
|
|
if (ifa->ifa_local)
|
|
NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
|
|
|
|
if (ifa->ifa_broadcast)
|
|
NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
|
|
|
|
if (ifa->ifa_label[0])
|
|
NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
int h, s_h;
|
|
int idx, s_idx;
|
|
int ip_idx, s_ip_idx;
|
|
struct net_device *dev;
|
|
struct in_device *in_dev;
|
|
struct in_ifaddr *ifa;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
|
|
s_h = cb->args[0];
|
|
s_idx = idx = cb->args[1];
|
|
s_ip_idx = ip_idx = cb->args[2];
|
|
|
|
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
|
|
idx = 0;
|
|
head = &net->dev_index_head[h];
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (h > s_h || idx > s_idx)
|
|
s_ip_idx = 0;
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (!in_dev)
|
|
goto cont;
|
|
|
|
for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
|
|
ifa = ifa->ifa_next, ip_idx++) {
|
|
if (ip_idx < s_ip_idx)
|
|
continue;
|
|
if (inet_fill_ifaddr(skb, ifa,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
RTM_NEWADDR, NLM_F_MULTI) <= 0) {
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
}
|
|
cont:
|
|
idx++;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
done:
|
|
cb->args[0] = h;
|
|
cb->args[1] = idx;
|
|
cb->args[2] = ip_idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
|
|
u32 pid)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 seq = nlh ? nlh->nlmsg_seq : 0;
|
|
int err = -ENOBUFS;
|
|
struct net *net;
|
|
|
|
net = dev_net(ifa->ifa_dev->dev);
|
|
skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in inet_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static void devinet_copy_dflt_conf(struct net *net, int i)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev) {
|
|
struct in_device *in_dev;
|
|
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev && !test_bit(i, in_dev->cnf.state))
|
|
in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* called with RTNL locked */
|
|
static void inet_forward_change(struct net *net)
|
|
{
|
|
struct net_device *dev;
|
|
int on = IPV4_DEVCONF_ALL(net, FORWARDING);
|
|
|
|
IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
|
|
IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
|
|
|
|
for_each_netdev(net, dev) {
|
|
struct in_device *in_dev;
|
|
if (on)
|
|
dev_disable_lro(dev);
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev)
|
|
IN_DEV_CONF_SET(in_dev, FORWARDING, on);
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
static int devinet_conf_proc(ctl_table *ctl, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
|
|
if (write) {
|
|
struct ipv4_devconf *cnf = ctl->extra1;
|
|
struct net *net = ctl->extra2;
|
|
int i = (int *)ctl->data - cnf->data;
|
|
|
|
set_bit(i, cnf->state);
|
|
|
|
if (cnf == net->ipv4.devconf_dflt)
|
|
devinet_copy_dflt_conf(net, i);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int devinet_sysctl_forward(ctl_table *ctl, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int *valp = ctl->data;
|
|
int val = *valp;
|
|
loff_t pos = *ppos;
|
|
int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
|
|
if (write && *valp != val) {
|
|
struct net *net = ctl->extra2;
|
|
|
|
if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
|
|
if (!rtnl_trylock()) {
|
|
/* Restore the original values before restarting */
|
|
*valp = val;
|
|
*ppos = pos;
|
|
return restart_syscall();
|
|
}
|
|
if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
|
|
inet_forward_change(net);
|
|
} else if (*valp) {
|
|
struct ipv4_devconf *cnf = ctl->extra1;
|
|
struct in_device *idev =
|
|
container_of(cnf, struct in_device, cnf);
|
|
dev_disable_lro(idev->dev);
|
|
}
|
|
rtnl_unlock();
|
|
rt_cache_flush(net, 0);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ipv4_doint_and_flush(ctl_table *ctl, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
int *valp = ctl->data;
|
|
int val = *valp;
|
|
int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
struct net *net = ctl->extra2;
|
|
|
|
if (write && *valp != val)
|
|
rt_cache_flush(net, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
|
|
{ \
|
|
.procname = name, \
|
|
.data = ipv4_devconf.data + \
|
|
IPV4_DEVCONF_ ## attr - 1, \
|
|
.maxlen = sizeof(int), \
|
|
.mode = mval, \
|
|
.proc_handler = proc, \
|
|
.extra1 = &ipv4_devconf, \
|
|
}
|
|
|
|
#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
|
|
|
|
#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
|
|
|
|
#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
|
|
DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
|
|
|
|
#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
|
|
DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
|
|
|
|
static struct devinet_sysctl_table {
|
|
struct ctl_table_header *sysctl_header;
|
|
struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
|
|
char *dev_name;
|
|
} devinet_sysctl = {
|
|
.devinet_vars = {
|
|
DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
|
|
devinet_sysctl_forward),
|
|
DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
|
|
|
|
DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
|
|
DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
|
|
"accept_source_route"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
|
|
DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
|
|
DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
|
|
DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
|
|
DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
|
|
DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
|
|
DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
|
|
DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
|
|
DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
|
|
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
|
|
"force_igmp_version"),
|
|
DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
|
|
"promote_secondaries"),
|
|
},
|
|
};
|
|
|
|
static int __devinet_sysctl_register(struct net *net, char *dev_name,
|
|
struct ipv4_devconf *p)
|
|
{
|
|
int i;
|
|
struct devinet_sysctl_table *t;
|
|
|
|
#define DEVINET_CTL_PATH_DEV 3
|
|
|
|
struct ctl_path devinet_ctl_path[] = {
|
|
{ .procname = "net", },
|
|
{ .procname = "ipv4", },
|
|
{ .procname = "conf", },
|
|
{ /* to be set */ },
|
|
{ },
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Make a copy of dev_name, because '.procname' is regarded as const
|
|
* by sysctl and we wouldn't want anyone to change it under our feet
|
|
* (see SIOCSIFNAME).
|
|
*/
|
|
t->dev_name = kstrdup(dev_name, GFP_KERNEL);
|
|
if (!t->dev_name)
|
|
goto free;
|
|
|
|
devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
|
|
|
|
t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
|
|
t->devinet_vars);
|
|
if (!t->sysctl_header)
|
|
goto free_procname;
|
|
|
|
p->sysctl = t;
|
|
return 0;
|
|
|
|
free_procname:
|
|
kfree(t->dev_name);
|
|
free:
|
|
kfree(t);
|
|
out:
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
|
|
{
|
|
struct devinet_sysctl_table *t = cnf->sysctl;
|
|
|
|
if (t == NULL)
|
|
return;
|
|
|
|
cnf->sysctl = NULL;
|
|
unregister_sysctl_table(t->sysctl_header);
|
|
kfree(t->dev_name);
|
|
kfree(t);
|
|
}
|
|
|
|
static void devinet_sysctl_register(struct in_device *idev)
|
|
{
|
|
neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
|
|
__devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
|
|
&idev->cnf);
|
|
}
|
|
|
|
static void devinet_sysctl_unregister(struct in_device *idev)
|
|
{
|
|
__devinet_sysctl_unregister(&idev->cnf);
|
|
neigh_sysctl_unregister(idev->arp_parms);
|
|
}
|
|
|
|
static struct ctl_table ctl_forward_entry[] = {
|
|
{
|
|
.procname = "ip_forward",
|
|
.data = &ipv4_devconf.data[
|
|
IPV4_DEVCONF_FORWARDING - 1],
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = devinet_sysctl_forward,
|
|
.extra1 = &ipv4_devconf,
|
|
.extra2 = &init_net,
|
|
},
|
|
{ },
|
|
};
|
|
|
|
static __net_initdata struct ctl_path net_ipv4_path[] = {
|
|
{ .procname = "net", },
|
|
{ .procname = "ipv4", },
|
|
{ },
|
|
};
|
|
#endif
|
|
|
|
static __net_init int devinet_init_net(struct net *net)
|
|
{
|
|
int err;
|
|
struct ipv4_devconf *all, *dflt;
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table *tbl = ctl_forward_entry;
|
|
struct ctl_table_header *forw_hdr;
|
|
#endif
|
|
|
|
err = -ENOMEM;
|
|
all = &ipv4_devconf;
|
|
dflt = &ipv4_devconf_dflt;
|
|
|
|
if (!net_eq(net, &init_net)) {
|
|
all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
|
|
if (all == NULL)
|
|
goto err_alloc_all;
|
|
|
|
dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
|
|
if (dflt == NULL)
|
|
goto err_alloc_dflt;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
|
|
if (tbl == NULL)
|
|
goto err_alloc_ctl;
|
|
|
|
tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
|
|
tbl[0].extra1 = all;
|
|
tbl[0].extra2 = net;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = __devinet_sysctl_register(net, "all", all);
|
|
if (err < 0)
|
|
goto err_reg_all;
|
|
|
|
err = __devinet_sysctl_register(net, "default", dflt);
|
|
if (err < 0)
|
|
goto err_reg_dflt;
|
|
|
|
err = -ENOMEM;
|
|
forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
|
|
if (forw_hdr == NULL)
|
|
goto err_reg_ctl;
|
|
net->ipv4.forw_hdr = forw_hdr;
|
|
#endif
|
|
|
|
net->ipv4.devconf_all = all;
|
|
net->ipv4.devconf_dflt = dflt;
|
|
return 0;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err_reg_ctl:
|
|
__devinet_sysctl_unregister(dflt);
|
|
err_reg_dflt:
|
|
__devinet_sysctl_unregister(all);
|
|
err_reg_all:
|
|
if (tbl != ctl_forward_entry)
|
|
kfree(tbl);
|
|
err_alloc_ctl:
|
|
#endif
|
|
if (dflt != &ipv4_devconf_dflt)
|
|
kfree(dflt);
|
|
err_alloc_dflt:
|
|
if (all != &ipv4_devconf)
|
|
kfree(all);
|
|
err_alloc_all:
|
|
return err;
|
|
}
|
|
|
|
static __net_exit void devinet_exit_net(struct net *net)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table *tbl;
|
|
|
|
tbl = net->ipv4.forw_hdr->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->ipv4.forw_hdr);
|
|
__devinet_sysctl_unregister(net->ipv4.devconf_dflt);
|
|
__devinet_sysctl_unregister(net->ipv4.devconf_all);
|
|
kfree(tbl);
|
|
#endif
|
|
kfree(net->ipv4.devconf_dflt);
|
|
kfree(net->ipv4.devconf_all);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations devinet_ops = {
|
|
.init = devinet_init_net,
|
|
.exit = devinet_exit_net,
|
|
};
|
|
|
|
void __init devinet_init(void)
|
|
{
|
|
register_pernet_subsys(&devinet_ops);
|
|
|
|
register_gifconf(PF_INET, inet_gifconf);
|
|
register_netdevice_notifier(&ip_netdev_notifier);
|
|
|
|
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
|
|
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
|
|
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
|
|
}
|
|
|