linux/net/ipv6/addrconf.c

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/*
* IPv6 Address [auto]configuration
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
/*
* Changes:
*
* Janos Farkas : delete timer on ifdown
* <chexum@bankinf.banki.hu>
* Andi Kleen : kill double kfree on module
* unload.
* Maciej W. Rozycki : FDDI support
* sekiya@USAGI : Don't send too many RS
* packets.
* yoshfuji@USAGI : Fixed interval between DAD
* packets.
* YOSHIFUJI Hideaki @USAGI : improved accuracy of
* address validation timer.
* YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
* support.
* Yuji SEKIYA @USAGI : Don't assign a same IPv6
* address on a same interface.
* YOSHIFUJI Hideaki @USAGI : ARCnet support
* YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
* seq_file.
* YOSHIFUJI Hideaki @USAGI : improved source address
* selection; consider scope,
* status etc.
*/
#define pr_fmt(fmt) "IPv6: " fmt
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_addr.h>
#include <linux/if_arp.h>
#include <linux/if_arcnet.h>
#include <linux/if_infiniband.h>
#include <linux/route.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 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>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <linux/capability.h>
#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/string.h>
#include <linux/hash.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/af_ieee802154.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/tcp.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/if_tunnel.h>
#include <linux/rtnetlink.h>
#include <linux/netconf.h>
#ifdef CONFIG_IPV6_PRIVACY
#include <linux/random.h>
#endif
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/export.h>
/* Set to 3 to get tracing... */
#define ACONF_DEBUG 2
#if ACONF_DEBUG >= 3
#define ADBG(x) printk x
#else
#define ADBG(x)
#endif
#define INFINITY_LIFE_TIME 0xFFFFFFFF
static inline u32 cstamp_delta(unsigned long cstamp)
{
return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
}
#ifdef CONFIG_SYSCTL
static void addrconf_sysctl_register(struct inet6_dev *idev);
static void addrconf_sysctl_unregister(struct inet6_dev *idev);
#else
static inline void addrconf_sysctl_register(struct inet6_dev *idev)
{
}
static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
}
#endif
#ifdef CONFIG_IPV6_PRIVACY
static void __ipv6_regen_rndid(struct inet6_dev *idev);
static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
static void ipv6_regen_rndid(unsigned long data);
#endif
static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
static int ipv6_count_addresses(struct inet6_dev *idev);
/*
* Configured unicast address hash table
*/
static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
static DEFINE_SPINLOCK(addrconf_hash_lock);
static void addrconf_verify(unsigned long);
static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
static DEFINE_SPINLOCK(addrconf_verify_lock);
static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
static void addrconf_type_change(struct net_device *dev,
unsigned long event);
static int addrconf_ifdown(struct net_device *dev, int how);
static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
int plen,
const struct net_device *dev,
u32 flags, u32 noflags);
static void addrconf_dad_start(struct inet6_ifaddr *ifp);
static void addrconf_dad_timer(unsigned long data);
static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
static void addrconf_dad_run(struct inet6_dev *idev);
static void addrconf_rs_timer(unsigned long data);
static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
static void inet6_prefix_notify(int event, struct inet6_dev *idev,
struct prefix_info *pinfo);
static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
struct net_device *dev);
[PATCH] Notifier chain update: API changes The kernel's implementation of notifier chains is unsafe. There is no protection against entries being added to or removed from a chain while the chain is in use. The issues were discussed in this thread: http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2 We noticed that notifier chains in the kernel fall into two basic usage classes: "Blocking" chains are always called from a process context and the callout routines are allowed to sleep; "Atomic" chains can be called from an atomic context and the callout routines are not allowed to sleep. We decided to codify this distinction and make it part of the API. Therefore this set of patches introduces three new, parallel APIs: one for blocking notifiers, one for atomic notifiers, and one for "raw" notifiers (which is really just the old API under a new name). New kinds of data structures are used for the heads of the chains, and new routines are defined for registration, unregistration, and calling a chain. The three APIs are explained in include/linux/notifier.h and their implementation is in kernel/sys.c. With atomic and blocking chains, the implementation guarantees that the chain links will not be corrupted and that chain callers will not get messed up by entries being added or removed. For raw chains the implementation provides no guarantees at all; users of this API must provide their own protections. (The idea was that situations may come up where the assumptions of the atomic and blocking APIs are not appropriate, so it should be possible for users to handle these things in their own way.) There are some limitations, which should not be too hard to live with. For atomic/blocking chains, registration and unregistration must always be done in a process context since the chain is protected by a mutex/rwsem. Also, a callout routine for a non-raw chain must not try to register or unregister entries on its own chain. (This did happen in a couple of places and the code had to be changed to avoid it.) Since atomic chains may be called from within an NMI handler, they cannot use spinlocks for synchronization. Instead we use RCU. The overhead falls almost entirely in the unregister routine, which is okay since unregistration is much less frequent that calling a chain. Here is the list of chains that we adjusted and their classifications. None of them use the raw API, so for the moment it is only a placeholder. ATOMIC CHAINS ------------- arch/i386/kernel/traps.c: i386die_chain arch/ia64/kernel/traps.c: ia64die_chain arch/powerpc/kernel/traps.c: powerpc_die_chain arch/sparc64/kernel/traps.c: sparc64die_chain arch/x86_64/kernel/traps.c: die_chain drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list kernel/panic.c: panic_notifier_list kernel/profile.c: task_free_notifier net/bluetooth/hci_core.c: hci_notifier net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain net/ipv6/addrconf.c: inet6addr_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain net/netlink/af_netlink.c: netlink_chain BLOCKING CHAINS --------------- arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain arch/s390/kernel/process.c: idle_chain arch/x86_64/kernel/process.c idle_notifier drivers/base/memory.c: memory_chain drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list drivers/macintosh/adb.c: adb_client_list drivers/macintosh/via-pmu.c sleep_notifier_list drivers/macintosh/via-pmu68k.c sleep_notifier_list drivers/macintosh/windfarm_core.c wf_client_list drivers/usb/core/notify.c usb_notifier_list drivers/video/fbmem.c fb_notifier_list kernel/cpu.c cpu_chain kernel/module.c module_notify_list kernel/profile.c munmap_notifier kernel/profile.c task_exit_notifier kernel/sys.c reboot_notifier_list net/core/dev.c netdev_chain net/decnet/dn_dev.c: dnaddr_chain net/ipv4/devinet.c: inetaddr_chain It's possible that some of these classifications are wrong. If they are, please let us know or submit a patch to fix them. Note that any chain that gets called very frequently should be atomic, because the rwsem read-locking used for blocking chains is very likely to incur cache misses on SMP systems. (However, if the chain's callout routines may sleep then the chain cannot be atomic.) The patch set was written by Alan Stern and Chandra Seetharaman, incorporating material written by Keith Owens and suggestions from Paul McKenney and Andrew Morton. [jes@sgi.com: restructure the notifier chain initialization macros] Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 09:16:30 +00:00
static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
static struct ipv6_devconf ipv6_devconf __read_mostly = {
.forwarding = 0,
.hop_limit = IPV6_DEFAULT_HOPLIMIT,
.mtu6 = IPV6_MIN_MTU,
.accept_ra = 1,
.accept_redirects = 1,
.autoconf = 1,
.force_mld_version = 0,
.dad_transmits = 1,
.rtr_solicits = MAX_RTR_SOLICITATIONS,
.rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
.rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
#ifdef CONFIG_IPV6_PRIVACY
.use_tempaddr = 0,
.temp_valid_lft = TEMP_VALID_LIFETIME,
.temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
.regen_max_retry = REGEN_MAX_RETRY,
.max_desync_factor = MAX_DESYNC_FACTOR,
#endif
.max_addresses = IPV6_MAX_ADDRESSES,
.accept_ra_defrtr = 1,
.accept_ra_pinfo = 1,
#ifdef CONFIG_IPV6_ROUTER_PREF
.accept_ra_rtr_pref = 1,
.rtr_probe_interval = 60 * HZ,
#ifdef CONFIG_IPV6_ROUTE_INFO
.accept_ra_rt_info_max_plen = 0,
#endif
#endif
.proxy_ndp = 0,
.accept_source_route = 0, /* we do not accept RH0 by default. */
.disable_ipv6 = 0,
.accept_dad = 1,
};
static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
.forwarding = 0,
.hop_limit = IPV6_DEFAULT_HOPLIMIT,
.mtu6 = IPV6_MIN_MTU,
.accept_ra = 1,
.accept_redirects = 1,
.autoconf = 1,
.dad_transmits = 1,
.rtr_solicits = MAX_RTR_SOLICITATIONS,
.rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
.rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
#ifdef CONFIG_IPV6_PRIVACY
.use_tempaddr = 0,
.temp_valid_lft = TEMP_VALID_LIFETIME,
.temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
.regen_max_retry = REGEN_MAX_RETRY,
.max_desync_factor = MAX_DESYNC_FACTOR,
#endif
.max_addresses = IPV6_MAX_ADDRESSES,
.accept_ra_defrtr = 1,
.accept_ra_pinfo = 1,
#ifdef CONFIG_IPV6_ROUTER_PREF
.accept_ra_rtr_pref = 1,
.rtr_probe_interval = 60 * HZ,
#ifdef CONFIG_IPV6_ROUTE_INFO
.accept_ra_rt_info_max_plen = 0,
#endif
#endif
.proxy_ndp = 0,
.accept_source_route = 0, /* we do not accept RH0 by default. */
.disable_ipv6 = 0,
.accept_dad = 1,
};
/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
/* Check if a valid qdisc is available */
static inline bool addrconf_qdisc_ok(const struct net_device *dev)
{
return !qdisc_tx_is_noop(dev);
}
static void addrconf_del_timer(struct inet6_ifaddr *ifp)
{
if (del_timer(&ifp->timer))
__in6_ifa_put(ifp);
}
enum addrconf_timer_t {
AC_NONE,
AC_DAD,
AC_RS,
};
static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
enum addrconf_timer_t what,
unsigned long when)
{
if (!del_timer(&ifp->timer))
in6_ifa_hold(ifp);
switch (what) {
case AC_DAD:
ifp->timer.function = addrconf_dad_timer;
break;
case AC_RS:
ifp->timer.function = addrconf_rs_timer;
break;
default:
break;
}
ifp->timer.expires = jiffies + when;
add_timer(&ifp->timer);
}
static int snmp6_alloc_dev(struct inet6_dev *idev)
{
if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
sizeof(struct ipstats_mib),
__alignof__(struct ipstats_mib)) < 0)
goto err_ip;
idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
GFP_KERNEL);
if (!idev->stats.icmpv6dev)
goto err_icmp;
idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
GFP_KERNEL);
if (!idev->stats.icmpv6msgdev)
goto err_icmpmsg;
return 0;
err_icmpmsg:
kfree(idev->stats.icmpv6dev);
err_icmp:
snmp_mib_free((void __percpu **)idev->stats.ipv6);
err_ip:
return -ENOMEM;
}
static void snmp6_free_dev(struct inet6_dev *idev)
{
kfree(idev->stats.icmpv6msgdev);
kfree(idev->stats.icmpv6dev);
snmp_mib_free((void __percpu **)idev->stats.ipv6);
}
/* Nobody refers to this device, we may destroy it. */
void in6_dev_finish_destroy(struct inet6_dev *idev)
{
struct net_device *dev = idev->dev;
WARN_ON(!list_empty(&idev->addr_list));
WARN_ON(idev->mc_list != NULL);
#ifdef NET_REFCNT_DEBUG
pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
#endif
dev_put(dev);
if (!idev->dead) {
pr_warn("Freeing alive inet6 device %p\n", idev);
return;
}
snmp6_free_dev(idev);
kfree_rcu(idev, rcu);
}
EXPORT_SYMBOL(in6_dev_finish_destroy);
static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
{
struct inet6_dev *ndev;
ASSERT_RTNL();
if (dev->mtu < IPV6_MIN_MTU)
return NULL;
ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
if (ndev == NULL)
return NULL;
rwlock_init(&ndev->lock);
ndev->dev = dev;
INIT_LIST_HEAD(&ndev->addr_list);
memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
ndev->cnf.mtu6 = dev->mtu;
ndev->cnf.sysctl = NULL;
ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
if (ndev->nd_parms == NULL) {
kfree(ndev);
return NULL;
}
if (ndev->cnf.forwarding)
dev_disable_lro(dev);
/* We refer to the device */
dev_hold(dev);
if (snmp6_alloc_dev(ndev) < 0) {
ADBG((KERN_WARNING
"%s: cannot allocate memory for statistics; dev=%s.\n",
__func__, dev->name));
neigh_parms_release(&nd_tbl, ndev->nd_parms);
dev_put(dev);
kfree(ndev);
return NULL;
}
if (snmp6_register_dev(ndev) < 0) {
ADBG((KERN_WARNING
"%s: cannot create /proc/net/dev_snmp6/%s\n",
__func__, dev->name));
neigh_parms_release(&nd_tbl, ndev->nd_parms);
ndev->dead = 1;
in6_dev_finish_destroy(ndev);
return NULL;
}
/* One reference from device. We must do this before
* we invoke __ipv6_regen_rndid().
*/
in6_dev_hold(ndev);
if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
ndev->cnf.accept_dad = -1;
#if IS_ENABLED(CONFIG_IPV6_SIT)
if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
pr_info("%s: Disabled Multicast RS\n", dev->name);
ndev->cnf.rtr_solicits = 0;
}
#endif
#ifdef CONFIG_IPV6_PRIVACY
INIT_LIST_HEAD(&ndev->tempaddr_list);
setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
if ((dev->flags&IFF_LOOPBACK) ||
dev->type == ARPHRD_TUNNEL ||
dev->type == ARPHRD_TUNNEL6 ||
dev->type == ARPHRD_SIT ||
dev->type == ARPHRD_NONE) {
ndev->cnf.use_tempaddr = -1;
} else {
in6_dev_hold(ndev);
ipv6_regen_rndid((unsigned long) ndev);
}
#endif
if (netif_running(dev) && addrconf_qdisc_ok(dev))
ndev->if_flags |= IF_READY;
ipv6_mc_init_dev(ndev);
ndev->tstamp = jiffies;
addrconf_sysctl_register(ndev);
/* protected by rtnl_lock */
rcu_assign_pointer(dev->ip6_ptr, ndev);
/* Join all-node multicast group */
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
/* Join all-router multicast group if forwarding is set */
if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
return ndev;
}
static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
idev = __in6_dev_get(dev);
if (!idev) {
idev = ipv6_add_dev(dev);
if (!idev)
return NULL;
}
if (dev->flags&IFF_UP)
ipv6_mc_up(idev);
return idev;
}
static int inet6_netconf_msgsize_devconf(int type)
{
int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
+ nla_total_size(4); /* NETCONFA_IFINDEX */
/* type -1 is used for ALL */
if (type == -1 || type == NETCONFA_FORWARDING)
size += nla_total_size(4);
#ifdef CONFIG_IPV6_MROUTE
if (type == -1 || type == NETCONFA_MC_FORWARDING)
size += nla_total_size(4);
#endif
return size;
}
static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
struct ipv6_devconf *devconf, u32 portid,
u32 seq, int event, unsigned int flags,
int type)
{
struct nlmsghdr *nlh;
struct netconfmsg *ncm;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
flags);
if (nlh == NULL)
return -EMSGSIZE;
ncm = nlmsg_data(nlh);
ncm->ncm_family = AF_INET6;
if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
goto nla_put_failure;
/* type -1 is used for ALL */
if ((type == -1 || type == NETCONFA_FORWARDING) &&
nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
goto nla_put_failure;
#ifdef CONFIG_IPV6_MROUTE
if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
nla_put_s32(skb, NETCONFA_MC_FORWARDING,
devconf->mc_forwarding) < 0)
goto nla_put_failure;
#endif
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
struct ipv6_devconf *devconf)
{
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
RTM_NEWNETCONF, 0, type);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
return;
errout:
rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
}
static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
[NETCONFA_IFINDEX] = { .len = sizeof(int) },
[NETCONFA_FORWARDING] = { .len = sizeof(int) },
};
static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
struct nlmsghdr *nlh,
void *arg)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX+1];
struct netconfmsg *ncm;
struct sk_buff *skb;
struct ipv6_devconf *devconf;
struct inet6_dev *in6_dev;
struct net_device *dev;
int ifindex;
int err;
err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
devconf_ipv6_policy);
if (err < 0)
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->ipv6.devconf_all;
break;
case NETCONFA_IFINDEX_DEFAULT:
devconf = net->ipv6.devconf_dflt;
break;
default:
dev = __dev_get_by_index(net, ifindex);
if (dev == NULL)
goto errout;
in6_dev = __in6_dev_get(dev);
if (in6_dev == NULL)
goto errout;
devconf = &in6_dev->cnf;
break;
}
err = -ENOBUFS;
skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
-1);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_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;
}
#ifdef CONFIG_SYSCTL
static void dev_forward_change(struct inet6_dev *idev)
{
struct net_device *dev;
struct inet6_ifaddr *ifa;
if (!idev)
return;
dev = idev->dev;
if (idev->cnf.forwarding)
dev_disable_lro(dev);
if (dev->flags & IFF_MULTICAST) {
if (idev->cnf.forwarding)
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
else
ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
}
list_for_each_entry(ifa, &idev->addr_list, if_list) {
if (ifa->flags&IFA_F_TENTATIVE)
continue;
if (idev->cnf.forwarding)
addrconf_join_anycast(ifa);
else
addrconf_leave_anycast(ifa);
}
inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
dev->ifindex, &idev->cnf);
}
static void addrconf_forward_change(struct net *net, __s32 newf)
{
struct net_device *dev;
struct inet6_dev *idev;
ipv6: addrconf: Avoid calling netdevice notifiers with RCU read-side lock Cong Wang reports that lockdep detected suspicious RCU usage while enabling IPV6 forwarding: [ 1123.310275] =============================== [ 1123.442202] [ INFO: suspicious RCU usage. ] [ 1123.558207] 3.6.0-rc1+ #109 Not tainted [ 1123.665204] ------------------------------- [ 1123.768254] include/linux/rcupdate.h:430 Illegal context switch in RCU read-side critical section! [ 1123.992320] [ 1123.992320] other info that might help us debug this: [ 1123.992320] [ 1124.307382] [ 1124.307382] rcu_scheduler_active = 1, debug_locks = 0 [ 1124.522220] 2 locks held by sysctl/5710: [ 1124.648364] #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff81768498>] rtnl_trylock+0x15/0x17 [ 1124.882211] #1: (rcu_read_lock){.+.+.+}, at: [<ffffffff81871df8>] rcu_lock_acquire+0x0/0x29 [ 1125.085209] [ 1125.085209] stack backtrace: [ 1125.332213] Pid: 5710, comm: sysctl Not tainted 3.6.0-rc1+ #109 [ 1125.441291] Call Trace: [ 1125.545281] [<ffffffff8109d915>] lockdep_rcu_suspicious+0x109/0x112 [ 1125.667212] [<ffffffff8107c240>] rcu_preempt_sleep_check+0x45/0x47 [ 1125.781838] [<ffffffff8107c260>] __might_sleep+0x1e/0x19b [...] [ 1127.445223] [<ffffffff81757ac5>] call_netdevice_notifiers+0x4a/0x4f [...] [ 1127.772188] [<ffffffff8175e125>] dev_disable_lro+0x32/0x6b [ 1127.885174] [<ffffffff81872d26>] dev_forward_change+0x30/0xcb [ 1128.013214] [<ffffffff818738c4>] addrconf_forward_change+0x85/0xc5 [...] addrconf_forward_change() uses RCU iteration over the netdev list, which is unnecessary since it already holds the RTNL lock. We also cannot reasonably require netdevice notifier functions not to sleep. Reported-by: Cong Wang <amwang@redhat.com> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-14 08:54:51 +00:00
for_each_netdev(net, dev) {
idev = __in6_dev_get(dev);
if (idev) {
int changed = (!idev->cnf.forwarding) ^ (!newf);
idev->cnf.forwarding = newf;
if (changed)
dev_forward_change(idev);
}
}
}
static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
{
struct net *net;
int old;
if (!rtnl_trylock())
return restart_syscall();
net = (struct net *)table->extra2;
old = *p;
*p = newf;
if (p == &net->ipv6.devconf_dflt->forwarding) {
if ((!newf) ^ (!old))
inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
NETCONFA_IFINDEX_DEFAULT,
net->ipv6.devconf_dflt);
rtnl_unlock();
return 0;
}
if (p == &net->ipv6.devconf_all->forwarding) {
net->ipv6.devconf_dflt->forwarding = newf;
addrconf_forward_change(net, newf);
if ((!newf) ^ (!old))
inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
NETCONFA_IFINDEX_ALL,
net->ipv6.devconf_all);
} else if ((!newf) ^ (!old))
dev_forward_change((struct inet6_dev *)table->extra1);
rtnl_unlock();
if (newf)
rt6_purge_dflt_routers(net);
return 1;
}
#endif
/* Nobody refers to this ifaddr, destroy it */
void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
{
WARN_ON(!hlist_unhashed(&ifp->addr_lst));
#ifdef NET_REFCNT_DEBUG
pr_debug("%s\n", __func__);
#endif
in6_dev_put(ifp->idev);
if (del_timer(&ifp->timer))
pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
if (ifp->state != INET6_IFADDR_STATE_DEAD) {
pr_warn("Freeing alive inet6 address %p\n", ifp);
return;
}
ip6_rt_put(ifp->rt);
kfree_rcu(ifp, rcu);
}
static void
ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
{
struct list_head *p;
int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
/*
* Each device address list is sorted in order of scope -
* global before linklocal.
*/
list_for_each(p, &idev->addr_list) {
struct inet6_ifaddr *ifa
= list_entry(p, struct inet6_ifaddr, if_list);
if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
break;
}
list_add_tail(&ifp->if_list, p);
}
static u32 inet6_addr_hash(const struct in6_addr *addr)
{
return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
}
/* On success it returns ifp with increased reference count */
static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
int scope, u32 flags)
{
struct inet6_ifaddr *ifa = NULL;
struct rt6_info *rt;
unsigned int hash;
int err = 0;
int addr_type = ipv6_addr_type(addr);
if (addr_type == IPV6_ADDR_ANY ||
addr_type & IPV6_ADDR_MULTICAST ||
(!(idev->dev->flags & IFF_LOOPBACK) &&
addr_type & IPV6_ADDR_LOOPBACK))
return ERR_PTR(-EADDRNOTAVAIL);
rcu_read_lock_bh();
if (idev->dead) {
err = -ENODEV; /*XXX*/
goto out2;
}
if (idev->cnf.disable_ipv6) {
err = -EACCES;
goto out2;
}
spin_lock(&addrconf_hash_lock);
/* Ignore adding duplicate addresses on an interface */
if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ADBG(("ipv6_add_addr: already assigned\n"));
err = -EEXIST;
goto out;
}
ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
if (ifa == NULL) {
ADBG(("ipv6_add_addr: malloc failed\n"));
err = -ENOBUFS;
goto out;
}
rt = addrconf_dst_alloc(idev, addr, false);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
goto out;
}
ifa->addr = *addr;
spin_lock_init(&ifa->lock);
spin_lock_init(&ifa->state_lock);
init_timer(&ifa->timer);
INIT_HLIST_NODE(&ifa->addr_lst);
ifa->timer.data = (unsigned long) ifa;
ifa->scope = scope;
ifa->prefix_len = pfxlen;
ifa->flags = flags | IFA_F_TENTATIVE;
ifa->cstamp = ifa->tstamp = jiffies;
ifa->rt = rt;
ifa->idev = idev;
in6_dev_hold(idev);
/* For caller */
in6_ifa_hold(ifa);
/* Add to big hash table */
hash = inet6_addr_hash(addr);
hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
spin_unlock(&addrconf_hash_lock);
write_lock(&idev->lock);
/* Add to inet6_dev unicast addr list. */
ipv6_link_dev_addr(idev, ifa);
#ifdef CONFIG_IPV6_PRIVACY
if (ifa->flags&IFA_F_TEMPORARY) {
list_add(&ifa->tmp_list, &idev->tempaddr_list);
in6_ifa_hold(ifa);
}
#endif
in6_ifa_hold(ifa);
write_unlock(&idev->lock);
out2:
rcu_read_unlock_bh();
if (likely(err == 0))
[PATCH] Notifier chain update: API changes The kernel's implementation of notifier chains is unsafe. There is no protection against entries being added to or removed from a chain while the chain is in use. The issues were discussed in this thread: http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2 We noticed that notifier chains in the kernel fall into two basic usage classes: "Blocking" chains are always called from a process context and the callout routines are allowed to sleep; "Atomic" chains can be called from an atomic context and the callout routines are not allowed to sleep. We decided to codify this distinction and make it part of the API. Therefore this set of patches introduces three new, parallel APIs: one for blocking notifiers, one for atomic notifiers, and one for "raw" notifiers (which is really just the old API under a new name). New kinds of data structures are used for the heads of the chains, and new routines are defined for registration, unregistration, and calling a chain. The three APIs are explained in include/linux/notifier.h and their implementation is in kernel/sys.c. With atomic and blocking chains, the implementation guarantees that the chain links will not be corrupted and that chain callers will not get messed up by entries being added or removed. For raw chains the implementation provides no guarantees at all; users of this API must provide their own protections. (The idea was that situations may come up where the assumptions of the atomic and blocking APIs are not appropriate, so it should be possible for users to handle these things in their own way.) There are some limitations, which should not be too hard to live with. For atomic/blocking chains, registration and unregistration must always be done in a process context since the chain is protected by a mutex/rwsem. Also, a callout routine for a non-raw chain must not try to register or unregister entries on its own chain. (This did happen in a couple of places and the code had to be changed to avoid it.) Since atomic chains may be called from within an NMI handler, they cannot use spinlocks for synchronization. Instead we use RCU. The overhead falls almost entirely in the unregister routine, which is okay since unregistration is much less frequent that calling a chain. Here is the list of chains that we adjusted and their classifications. None of them use the raw API, so for the moment it is only a placeholder. ATOMIC CHAINS ------------- arch/i386/kernel/traps.c: i386die_chain arch/ia64/kernel/traps.c: ia64die_chain arch/powerpc/kernel/traps.c: powerpc_die_chain arch/sparc64/kernel/traps.c: sparc64die_chain arch/x86_64/kernel/traps.c: die_chain drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list kernel/panic.c: panic_notifier_list kernel/profile.c: task_free_notifier net/bluetooth/hci_core.c: hci_notifier net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain net/ipv6/addrconf.c: inet6addr_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain net/netlink/af_netlink.c: netlink_chain BLOCKING CHAINS --------------- arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain arch/s390/kernel/process.c: idle_chain arch/x86_64/kernel/process.c idle_notifier drivers/base/memory.c: memory_chain drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list drivers/macintosh/adb.c: adb_client_list drivers/macintosh/via-pmu.c sleep_notifier_list drivers/macintosh/via-pmu68k.c sleep_notifier_list drivers/macintosh/windfarm_core.c wf_client_list drivers/usb/core/notify.c usb_notifier_list drivers/video/fbmem.c fb_notifier_list kernel/cpu.c cpu_chain kernel/module.c module_notify_list kernel/profile.c munmap_notifier kernel/profile.c task_exit_notifier kernel/sys.c reboot_notifier_list net/core/dev.c netdev_chain net/decnet/dn_dev.c: dnaddr_chain net/ipv4/devinet.c: inetaddr_chain It's possible that some of these classifications are wrong. If they are, please let us know or submit a patch to fix them. Note that any chain that gets called very frequently should be atomic, because the rwsem read-locking used for blocking chains is very likely to incur cache misses on SMP systems. (However, if the chain's callout routines may sleep then the chain cannot be atomic.) The patch set was written by Alan Stern and Chandra Seetharaman, incorporating material written by Keith Owens and suggestions from Paul McKenney and Andrew Morton. [jes@sgi.com: restructure the notifier chain initialization macros] Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 09:16:30 +00:00
atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
else {
kfree(ifa);
ifa = ERR_PTR(err);
}
return ifa;
out:
spin_unlock(&addrconf_hash_lock);
goto out2;
}
/* This function wants to get referenced ifp and releases it before return */
static void ipv6_del_addr(struct inet6_ifaddr *ifp)
{
struct inet6_ifaddr *ifa, *ifn;
struct inet6_dev *idev = ifp->idev;
int state;
int deleted = 0, onlink = 0;
unsigned long expires = jiffies;
spin_lock_bh(&ifp->state_lock);
state = ifp->state;
ifp->state = INET6_IFADDR_STATE_DEAD;
spin_unlock_bh(&ifp->state_lock);
if (state == INET6_IFADDR_STATE_DEAD)
goto out;
spin_lock_bh(&addrconf_hash_lock);
hlist_del_init_rcu(&ifp->addr_lst);
spin_unlock_bh(&addrconf_hash_lock);
write_lock_bh(&idev->lock);
#ifdef CONFIG_IPV6_PRIVACY
if (ifp->flags&IFA_F_TEMPORARY) {
list_del(&ifp->tmp_list);
if (ifp->ifpub) {
in6_ifa_put(ifp->ifpub);
ifp->ifpub = NULL;
}
__in6_ifa_put(ifp);
}
#endif
list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
if (ifa == ifp) {
list_del_init(&ifp->if_list);
__in6_ifa_put(ifp);
if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
break;
deleted = 1;
continue;
} else if (ifp->flags & IFA_F_PERMANENT) {
if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
ifp->prefix_len)) {
if (ifa->flags & IFA_F_PERMANENT) {
onlink = 1;
if (deleted)
break;
} else {
unsigned long lifetime;
if (!onlink)
onlink = -1;
spin_lock(&ifa->lock);
lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
/*
* Note: Because this address is
* not permanent, lifetime <
* LONG_MAX / HZ here.
*/
if (time_before(expires,
ifa->tstamp + lifetime * HZ))
expires = ifa->tstamp + lifetime * HZ;
spin_unlock(&ifa->lock);
}
}
}
}
write_unlock_bh(&idev->lock);
addrconf_del_timer(ifp);
ipv6_ifa_notify(RTM_DELADDR, ifp);
[PATCH] Notifier chain update: API changes The kernel's implementation of notifier chains is unsafe. There is no protection against entries being added to or removed from a chain while the chain is in use. The issues were discussed in this thread: http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2 We noticed that notifier chains in the kernel fall into two basic usage classes: "Blocking" chains are always called from a process context and the callout routines are allowed to sleep; "Atomic" chains can be called from an atomic context and the callout routines are not allowed to sleep. We decided to codify this distinction and make it part of the API. Therefore this set of patches introduces three new, parallel APIs: one for blocking notifiers, one for atomic notifiers, and one for "raw" notifiers (which is really just the old API under a new name). New kinds of data structures are used for the heads of the chains, and new routines are defined for registration, unregistration, and calling a chain. The three APIs are explained in include/linux/notifier.h and their implementation is in kernel/sys.c. With atomic and blocking chains, the implementation guarantees that the chain links will not be corrupted and that chain callers will not get messed up by entries being added or removed. For raw chains the implementation provides no guarantees at all; users of this API must provide their own protections. (The idea was that situations may come up where the assumptions of the atomic and blocking APIs are not appropriate, so it should be possible for users to handle these things in their own way.) There are some limitations, which should not be too hard to live with. For atomic/blocking chains, registration and unregistration must always be done in a process context since the chain is protected by a mutex/rwsem. Also, a callout routine for a non-raw chain must not try to register or unregister entries on its own chain. (This did happen in a couple of places and the code had to be changed to avoid it.) Since atomic chains may be called from within an NMI handler, they cannot use spinlocks for synchronization. Instead we use RCU. The overhead falls almost entirely in the unregister routine, which is okay since unregistration is much less frequent that calling a chain. Here is the list of chains that we adjusted and their classifications. None of them use the raw API, so for the moment it is only a placeholder. ATOMIC CHAINS ------------- arch/i386/kernel/traps.c: i386die_chain arch/ia64/kernel/traps.c: ia64die_chain arch/powerpc/kernel/traps.c: powerpc_die_chain arch/sparc64/kernel/traps.c: sparc64die_chain arch/x86_64/kernel/traps.c: die_chain drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list kernel/panic.c: panic_notifier_list kernel/profile.c: task_free_notifier net/bluetooth/hci_core.c: hci_notifier net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain net/ipv6/addrconf.c: inet6addr_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain net/netlink/af_netlink.c: netlink_chain BLOCKING CHAINS --------------- arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain arch/s390/kernel/process.c: idle_chain arch/x86_64/kernel/process.c idle_notifier drivers/base/memory.c: memory_chain drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list drivers/macintosh/adb.c: adb_client_list drivers/macintosh/via-pmu.c sleep_notifier_list drivers/macintosh/via-pmu68k.c sleep_notifier_list drivers/macintosh/windfarm_core.c wf_client_list drivers/usb/core/notify.c usb_notifier_list drivers/video/fbmem.c fb_notifier_list kernel/cpu.c cpu_chain kernel/module.c module_notify_list kernel/profile.c munmap_notifier kernel/profile.c task_exit_notifier kernel/sys.c reboot_notifier_list net/core/dev.c netdev_chain net/decnet/dn_dev.c: dnaddr_chain net/ipv4/devinet.c: inetaddr_chain It's possible that some of these classifications are wrong. If they are, please let us know or submit a patch to fix them. Note that any chain that gets called very frequently should be atomic, because the rwsem read-locking used for blocking chains is very likely to incur cache misses on SMP systems. (However, if the chain's callout routines may sleep then the chain cannot be atomic.) The patch set was written by Alan Stern and Chandra Seetharaman, incorporating material written by Keith Owens and suggestions from Paul McKenney and Andrew Morton. [jes@sgi.com: restructure the notifier chain initialization macros] Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 09:16:30 +00:00
atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
/*
* Purge or update corresponding prefix
*
* 1) we don't purge prefix here if address was not permanent.
* prefix is managed by its own lifetime.
* 2) if there're no addresses, delete prefix.
* 3) if there're still other permanent address(es),
* corresponding prefix is still permanent.
* 4) otherwise, update prefix lifetime to the
* longest valid lifetime among the corresponding
* addresses on the device.
* Note: subsequent RA will update lifetime.
*
* --yoshfuji
*/
if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
struct in6_addr prefix;
struct rt6_info *rt;
ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
rt = addrconf_get_prefix_route(&prefix,
ifp->prefix_len,
ifp->idev->dev,
0, RTF_GATEWAY | RTF_DEFAULT);
if (rt) {
if (onlink == 0) {
ip6_del_rt(rt);
rt = NULL;
} else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
rt6_set_expires(rt, expires);
}
}
ip6_rt_put(rt);
}
/* clean up prefsrc entries */
rt6_remove_prefsrc(ifp);
out:
in6_ifa_put(ifp);
}
#ifdef CONFIG_IPV6_PRIVACY
static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
{
struct inet6_dev *idev = ifp->idev;
struct in6_addr addr, *tmpaddr;
unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
unsigned long regen_advance;
int tmp_plen;
int ret = 0;
int max_addresses;
u32 addr_flags;
unsigned long now = jiffies;
write_lock(&idev->lock);
if (ift) {
spin_lock_bh(&ift->lock);
memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
spin_unlock_bh(&ift->lock);
tmpaddr = &addr;
} else {
tmpaddr = NULL;
}
retry:
in6_dev_hold(idev);
if (idev->cnf.use_tempaddr <= 0) {
write_unlock(&idev->lock);
pr_info("%s: use_tempaddr is disabled\n", __func__);
in6_dev_put(idev);
ret = -1;
goto out;
}
spin_lock_bh(&ifp->lock);
if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
idev->cnf.use_tempaddr = -1; /*XXX*/
spin_unlock_bh(&ifp->lock);
write_unlock(&idev->lock);
pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
__func__);
in6_dev_put(idev);
ret = -1;
goto out;
}
in6_ifa_hold(ifp);
memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
__ipv6_try_regen_rndid(idev, tmpaddr);
memcpy(&addr.s6_addr[8], idev->rndid, 8);
age = (now - ifp->tstamp) / HZ;
tmp_valid_lft = min_t(__u32,
ifp->valid_lft,
idev->cnf.temp_valid_lft + age);
tmp_prefered_lft = min_t(__u32,
ifp->prefered_lft,
idev->cnf.temp_prefered_lft + age -
idev->cnf.max_desync_factor);
tmp_plen = ifp->prefix_len;
max_addresses = idev->cnf.max_addresses;
tmp_tstamp = ifp->tstamp;
spin_unlock_bh(&ifp->lock);
regen_advance = idev->cnf.regen_max_retry *
idev->cnf.dad_transmits *
idev->nd_parms->retrans_time / HZ;
write_unlock(&idev->lock);
/* A temporary address is created only if this calculated Preferred
* Lifetime is greater than REGEN_ADVANCE time units. In particular,
* an implementation must not create a temporary address with a zero
* Preferred Lifetime.
*/
if (tmp_prefered_lft <= regen_advance) {
in6_ifa_put(ifp);
in6_dev_put(idev);
ret = -1;
goto out;
}
addr_flags = IFA_F_TEMPORARY;
/* set in addrconf_prefix_rcv() */
if (ifp->flags & IFA_F_OPTIMISTIC)
addr_flags |= IFA_F_OPTIMISTIC;
ift = !max_addresses ||
ipv6_count_addresses(idev) < max_addresses ?
ipv6_add_addr(idev, &addr, tmp_plen,
ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
addr_flags) : NULL;
if (IS_ERR_OR_NULL(ift)) {
in6_ifa_put(ifp);
in6_dev_put(idev);
pr_info("%s: retry temporary address regeneration\n", __func__);
tmpaddr = &addr;
write_lock(&idev->lock);
goto retry;
}
spin_lock_bh(&ift->lock);
ift->ifpub = ifp;
ift->valid_lft = tmp_valid_lft;
ift->prefered_lft = tmp_prefered_lft;
ift->cstamp = now;
ift->tstamp = tmp_tstamp;
spin_unlock_bh(&ift->lock);
addrconf_dad_start(ift);
in6_ifa_put(ift);
in6_dev_put(idev);
out:
return ret;
}
#endif
/*
* Choose an appropriate source address (RFC3484)
*/
enum {
IPV6_SADDR_RULE_INIT = 0,
IPV6_SADDR_RULE_LOCAL,
IPV6_SADDR_RULE_SCOPE,
IPV6_SADDR_RULE_PREFERRED,
#ifdef CONFIG_IPV6_MIP6
IPV6_SADDR_RULE_HOA,
#endif
IPV6_SADDR_RULE_OIF,
IPV6_SADDR_RULE_LABEL,
#ifdef CONFIG_IPV6_PRIVACY
IPV6_SADDR_RULE_PRIVACY,
#endif
IPV6_SADDR_RULE_ORCHID,
IPV6_SADDR_RULE_PREFIX,
IPV6_SADDR_RULE_MAX
};
struct ipv6_saddr_score {
int rule;
int addr_type;
struct inet6_ifaddr *ifa;
DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
int scopedist;
int matchlen;
};
struct ipv6_saddr_dst {
const struct in6_addr *addr;
int ifindex;
int scope;
int label;
unsigned int prefs;
};
static inline int ipv6_saddr_preferred(int type)
{
if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
return 1;
return 0;
}
static int ipv6_get_saddr_eval(struct net *net,
struct ipv6_saddr_score *score,
struct ipv6_saddr_dst *dst,
int i)
{
int ret;
if (i <= score->rule) {
switch (i) {
case IPV6_SADDR_RULE_SCOPE:
ret = score->scopedist;
break;
case IPV6_SADDR_RULE_PREFIX:
ret = score->matchlen;
break;
default:
ret = !!test_bit(i, score->scorebits);
}
goto out;
}
switch (i) {
case IPV6_SADDR_RULE_INIT:
/* Rule 0: remember if hiscore is not ready yet */
ret = !!score->ifa;
break;
case IPV6_SADDR_RULE_LOCAL:
/* Rule 1: Prefer same address */
ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
break;
case IPV6_SADDR_RULE_SCOPE:
/* Rule 2: Prefer appropriate scope
*
* ret
* ^
* -1 | d 15
* ---+--+-+---> scope
* |
* | d is scope of the destination.
* B-d | \
* | \ <- smaller scope is better if
* B-15 | \ if scope is enough for destinaion.
* | ret = B - scope (-1 <= scope >= d <= 15).
* d-C-1 | /
* |/ <- greater is better
* -C / if scope is not enough for destination.
* /| ret = scope - C (-1 <= d < scope <= 15).
*
* d - C - 1 < B -15 (for all -1 <= d <= 15).
* C > d + 14 - B >= 15 + 14 - B = 29 - B.
* Assume B = 0 and we get C > 29.
*/
ret = __ipv6_addr_src_scope(score->addr_type);
if (ret >= dst->scope)
ret = -ret;
else
ret -= 128; /* 30 is enough */
score->scopedist = ret;
break;
case IPV6_SADDR_RULE_PREFERRED:
/* Rule 3: Avoid deprecated and optimistic addresses */
ret = ipv6_saddr_preferred(score->addr_type) ||
!(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
break;
#ifdef CONFIG_IPV6_MIP6
case IPV6_SADDR_RULE_HOA:
{
/* Rule 4: Prefer home address */
int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
break;
}
#endif
case IPV6_SADDR_RULE_OIF:
/* Rule 5: Prefer outgoing interface */
ret = (!dst->ifindex ||
dst->ifindex == score->ifa->idev->dev->ifindex);
break;
case IPV6_SADDR_RULE_LABEL:
/* Rule 6: Prefer matching label */
ret = ipv6_addr_label(net,
&score->ifa->addr, score->addr_type,
score->ifa->idev->dev->ifindex) == dst->label;
break;
#ifdef CONFIG_IPV6_PRIVACY
case IPV6_SADDR_RULE_PRIVACY:
{
/* Rule 7: Prefer public address
* Note: prefer temporary address if use_tempaddr >= 2
*/
int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
score->ifa->idev->cnf.use_tempaddr >= 2;
ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
break;
}
#endif
case IPV6_SADDR_RULE_ORCHID:
/* Rule 8-: Prefer ORCHID vs ORCHID or
* non-ORCHID vs non-ORCHID
*/
ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
ipv6_addr_orchid(dst->addr));
break;
case IPV6_SADDR_RULE_PREFIX:
/* Rule 8: Use longest matching prefix */
ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
if (ret > score->ifa->prefix_len)
ret = score->ifa->prefix_len;
score->matchlen = ret;
break;
default:
ret = 0;
}
if (ret)
__set_bit(i, score->scorebits);
score->rule = i;
out:
return ret;
}
int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
const struct in6_addr *daddr, unsigned int prefs,
struct in6_addr *saddr)
{
struct ipv6_saddr_score scores[2],
*score = &scores[0], *hiscore = &scores[1];
struct ipv6_saddr_dst dst;
struct net_device *dev;
int dst_type;
dst_type = __ipv6_addr_type(daddr);
dst.addr = daddr;
dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
dst.scope = __ipv6_addr_src_scope(dst_type);
dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
dst.prefs = prefs;
hiscore->rule = -1;
hiscore->ifa = NULL;
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
struct inet6_dev *idev;
/* Candidate Source Address (section 4)
* - multicast and link-local destination address,
* the set of candidate source address MUST only
* include addresses assigned to interfaces
* belonging to the same link as the outgoing
* interface.
* (- For site-local destination addresses, the
* set of candidate source addresses MUST only
* include addresses assigned to interfaces
* belonging to the same site as the outgoing
* interface.)
*/
if (((dst_type & IPV6_ADDR_MULTICAST) ||
dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
dst.ifindex && dev->ifindex != dst.ifindex)
continue;
idev = __in6_dev_get(dev);
if (!idev)
continue;
read_lock_bh(&idev->lock);
list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
int i;
/*
* - Tentative Address (RFC2462 section 5.4)
* - A tentative address is not considered
* "assigned to an interface" in the traditional
* sense, unless it is also flagged as optimistic.
* - Candidate Source Address (section 4)
* - In any case, anycast addresses, multicast
* addresses, and the unspecified address MUST
* NOT be included in a candidate set.
*/
if ((score->ifa->flags & IFA_F_TENTATIVE) &&
(!(score->ifa->flags & IFA_F_OPTIMISTIC)))
continue;
score->addr_type = __ipv6_addr_type(&score->ifa->addr);
if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
score->addr_type & IPV6_ADDR_MULTICAST)) {
LIMIT_NETDEBUG(KERN_DEBUG
"ADDRCONF: unspecified / multicast address "
"assigned as unicast address on %s",
dev->name);
continue;
}
score->rule = -1;
bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
int minihiscore, miniscore;
minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
if (minihiscore > miniscore) {
if (i == IPV6_SADDR_RULE_SCOPE &&
score->scopedist > 0) {
/*
* special case:
* each remaining entry
* has too small (not enough)
* scope, because ifa entries
* are sorted by their scope
* values.
*/
goto try_nextdev;
}
break;
} else if (minihiscore < miniscore) {
if (hiscore->ifa)
in6_ifa_put(hiscore->ifa);
in6_ifa_hold(score->ifa);
swap(hiscore, score);
/* restore our iterator */
score->ifa = hiscore->ifa;
break;
}
}
}
try_nextdev:
read_unlock_bh(&idev->lock);
}
rcu_read_unlock();
if (!hiscore->ifa)
return -EADDRNOTAVAIL;
*saddr = hiscore->ifa->addr;
in6_ifa_put(hiscore->ifa);
return 0;
}
EXPORT_SYMBOL(ipv6_dev_get_saddr);
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
unsigned char banned_flags)
{
struct inet6_dev *idev;
int err = -EADDRNOTAVAIL;
rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list) {
if (ifp->scope == IFA_LINK &&
!(ifp->flags & banned_flags)) {
*addr = ifp->addr;
err = 0;
break;
}
}
read_unlock_bh(&idev->lock);
}
rcu_read_unlock();
return err;
}
static int ipv6_count_addresses(struct inet6_dev *idev)
{
int cnt = 0;
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list)
cnt++;
read_unlock_bh(&idev->lock);
return cnt;
}
int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
struct net_device *dev, int strict)
{
struct inet6_ifaddr *ifp;
struct hlist_node *node;
unsigned int hash = inet6_addr_hash(addr);
rcu_read_lock_bh();
hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
if (!net_eq(dev_net(ifp->idev->dev), net))
continue;
if (ipv6_addr_equal(&ifp->addr, addr) &&
!(ifp->flags&IFA_F_TENTATIVE) &&
(dev == NULL || ifp->idev->dev == dev ||
!(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
rcu_read_unlock_bh();
return 1;
}
}
rcu_read_unlock_bh();
return 0;
}
EXPORT_SYMBOL(ipv6_chk_addr);
static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
struct net_device *dev)
{
unsigned int hash = inet6_addr_hash(addr);
struct inet6_ifaddr *ifp;
struct hlist_node *node;
hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
if (!net_eq(dev_net(ifp->idev->dev), net))
continue;
if (ipv6_addr_equal(&ifp->addr, addr)) {
if (dev == NULL || ifp->idev->dev == dev)
return true;
}
}
return false;
}
int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
{
struct inet6_dev *idev;
struct inet6_ifaddr *ifa;
int onlink;
onlink = 0;
rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
read_lock_bh(&idev->lock);
list_for_each_entry(ifa, &idev->addr_list, if_list) {
onlink = ipv6_prefix_equal(addr, &ifa->addr,
ifa->prefix_len);
if (onlink)
break;
}
read_unlock_bh(&idev->lock);
}
rcu_read_unlock();
return onlink;
}
EXPORT_SYMBOL(ipv6_chk_prefix);
struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
struct net_device *dev, int strict)
{
struct inet6_ifaddr *ifp, *result = NULL;
unsigned int hash = inet6_addr_hash(addr);
struct hlist_node *node;
rcu_read_lock_bh();
hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
if (!net_eq(dev_net(ifp->idev->dev), net))
continue;
if (ipv6_addr_equal(&ifp->addr, addr)) {
if (dev == NULL || ifp->idev->dev == dev ||
!(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
result = ifp;
in6_ifa_hold(ifp);
break;
}
}
}
rcu_read_unlock_bh();
return result;
}
/* Gets referenced address, destroys ifaddr */
static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
{
if (ifp->flags&IFA_F_PERMANENT) {
spin_lock_bh(&ifp->lock);
addrconf_del_timer(ifp);
ifp->flags |= IFA_F_TENTATIVE;
if (dad_failed)
ifp->flags |= IFA_F_DADFAILED;
spin_unlock_bh(&ifp->lock);
if (dad_failed)
ipv6_ifa_notify(0, ifp);
in6_ifa_put(ifp);
#ifdef CONFIG_IPV6_PRIVACY
} else if (ifp->flags&IFA_F_TEMPORARY) {
struct inet6_ifaddr *ifpub;
spin_lock_bh(&ifp->lock);
ifpub = ifp->ifpub;
if (ifpub) {
in6_ifa_hold(ifpub);
spin_unlock_bh(&ifp->lock);
ipv6_create_tempaddr(ifpub, ifp);
in6_ifa_put(ifpub);
} else {
spin_unlock_bh(&ifp->lock);
}
ipv6_del_addr(ifp);
#endif
} else
ipv6_del_addr(ifp);
}
static int addrconf_dad_end(struct inet6_ifaddr *ifp)
{
int err = -ENOENT;
spin_lock(&ifp->state_lock);
if (ifp->state == INET6_IFADDR_STATE_DAD) {
ifp->state = INET6_IFADDR_STATE_POSTDAD;
err = 0;
}
spin_unlock(&ifp->state_lock);
return err;
}
void addrconf_dad_failure(struct inet6_ifaddr *ifp)
{
struct inet6_dev *idev = ifp->idev;
if (addrconf_dad_end(ifp)) {
in6_ifa_put(ifp);
return;
}
net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
ifp->idev->dev->name, &ifp->addr);
if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
struct in6_addr addr;
addr.s6_addr32[0] = htonl(0xfe800000);
addr.s6_addr32[1] = 0;
if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
ipv6_addr_equal(&ifp->addr, &addr)) {
/* DAD failed for link-local based on MAC address */
idev->cnf.disable_ipv6 = 1;
pr_info("%s: IPv6 being disabled!\n",
ifp->idev->dev->name);
}
}
addrconf_dad_stop(ifp, 1);
}
/* Join to solicited addr multicast group. */
void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
{
struct in6_addr maddr;
if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
return;
addrconf_addr_solict_mult(addr, &maddr);
ipv6_dev_mc_inc(dev, &maddr);
}
void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
{
struct in6_addr maddr;
if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
return;
addrconf_addr_solict_mult(addr, &maddr);
__ipv6_dev_mc_dec(idev, &maddr);
}
static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
{
struct in6_addr addr;
if (ifp->prefix_len == 127) /* RFC 6164 */
return;
ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
if (ipv6_addr_any(&addr))
return;
ipv6_dev_ac_inc(ifp->idev->dev, &addr);
}
static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
{
struct in6_addr addr;
if (ifp->prefix_len == 127) /* RFC 6164 */
return;
ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
if (ipv6_addr_any(&addr))
return;
__ipv6_dev_ac_dec(ifp->idev, &addr);
}
static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
{
if (dev->addr_len != ETH_ALEN)
return -1;
memcpy(eui, dev->dev_addr, 3);
memcpy(eui + 5, dev->dev_addr + 3, 3);
/*
* The zSeries OSA network cards can be shared among various
* OS instances, but the OSA cards have only one MAC address.
* This leads to duplicate address conflicts in conjunction
* with IPv6 if more than one instance uses the same card.
*
* The driver for these cards can deliver a unique 16-bit
* identifier for each instance sharing the same card. It is
* placed instead of 0xFFFE in the interface identifier. The
* "u" bit of the interface identifier is not inverted in this
* case. Hence the resulting interface identifier has local
* scope according to RFC2373.
*/
if (dev->dev_id) {
eui[3] = (dev->dev_id >> 8) & 0xFF;
eui[4] = dev->dev_id & 0xFF;
} else {
eui[3] = 0xFF;
eui[4] = 0xFE;
eui[0] ^= 2;
}
return 0;
}
static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
{
if (dev->addr_len != IEEE802154_ADDR_LEN)
return -1;
memcpy(eui, dev->dev_addr, 8);
return 0;
}
static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
{
/* XXX: inherit EUI-64 from other interface -- yoshfuji */
if (dev->addr_len != ARCNET_ALEN)
return -1;
memset(eui, 0, 7);
eui[7] = *(u8 *)dev->dev_addr;
return 0;
}
static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
{
if (dev->addr_len != INFINIBAND_ALEN)
return -1;
memcpy(eui, dev->dev_addr + 12, 8);
eui[0] |= 2;
return 0;
}
static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
{
if (addr == 0)
return -1;
eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
eui[1] = 0;
eui[2] = 0x5E;
eui[3] = 0xFE;
memcpy(eui + 4, &addr, 4);
return 0;
}
static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
{
if (dev->priv_flags & IFF_ISATAP)
return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
return -1;
}
static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
{
return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
}
static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
{
switch (dev->type) {
case ARPHRD_ETHER:
case ARPHRD_FDDI:
return addrconf_ifid_eui48(eui, dev);
case ARPHRD_ARCNET:
return addrconf_ifid_arcnet(eui, dev);
case ARPHRD_INFINIBAND:
return addrconf_ifid_infiniband(eui, dev);
case ARPHRD_SIT:
return addrconf_ifid_sit(eui, dev);
case ARPHRD_IPGRE:
return addrconf_ifid_gre(eui, dev);
case ARPHRD_IEEE802154:
return addrconf_ifid_eui64(eui, dev);
}
return -1;
}
static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
{
int err = -1;
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list) {
if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
memcpy(eui, ifp->addr.s6_addr+8, 8);
err = 0;
break;
}
}
read_unlock_bh(&idev->lock);
return err;
}
#ifdef CONFIG_IPV6_PRIVACY
/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
static void __ipv6_regen_rndid(struct inet6_dev *idev)
{
regen:
get_random_bytes(idev->rndid, sizeof(idev->rndid));
idev->rndid[0] &= ~0x02;
/*
* <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
* check if generated address is not inappropriate
*
* - Reserved subnet anycast (RFC 2526)
* 11111101 11....11 1xxxxxxx
* - ISATAP (RFC4214) 6.1
* 00-00-5E-FE-xx-xx-xx-xx
* - value 0
* - XXX: already assigned to an address on the device
*/
if (idev->rndid[0] == 0xfd &&
(idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
(idev->rndid[7]&0x80))
goto regen;
if ((idev->rndid[0]|idev->rndid[1]) == 0) {
if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
goto regen;
if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
goto regen;
}
}
static void ipv6_regen_rndid(unsigned long data)
{
struct inet6_dev *idev = (struct inet6_dev *) data;
unsigned long expires;
rcu_read_lock_bh();
write_lock_bh(&idev->lock);
if (idev->dead)
goto out;
__ipv6_regen_rndid(idev);
expires = jiffies +
idev->cnf.temp_prefered_lft * HZ -
idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
idev->cnf.max_desync_factor * HZ;
if (time_before(expires, jiffies)) {
pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
__func__, idev->dev->name);
goto out;
}
if (!mod_timer(&idev->regen_timer, expires))
in6_dev_hold(idev);
out:
write_unlock_bh(&idev->lock);
rcu_read_unlock_bh();
in6_dev_put(idev);
}
static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
{
if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
__ipv6_regen_rndid(idev);
}
#endif
/*
* Add prefix route.
*/
static void
addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
unsigned long expires, u32 flags)
{
struct fib6_config cfg = {
.fc_table = RT6_TABLE_PREFIX,
.fc_metric = IP6_RT_PRIO_ADDRCONF,
.fc_ifindex = dev->ifindex,
.fc_expires = expires,
.fc_dst_len = plen,
.fc_flags = RTF_UP | flags,
.fc_nlinfo.nl_net = dev_net(dev),
.fc_protocol = RTPROT_KERNEL,
};
cfg.fc_dst = *pfx;
/* Prevent useless cloning on PtP SIT.
This thing is done here expecting that the whole
class of non-broadcast devices need not cloning.
*/
#if IS_ENABLED(CONFIG_IPV6_SIT)
if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
cfg.fc_flags |= RTF_NONEXTHOP;
#endif
ip6_route_add(&cfg);
}
static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
int plen,
const struct net_device *dev,
u32 flags, u32 noflags)
{
struct fib6_node *fn;
struct rt6_info *rt = NULL;
struct fib6_table *table;
table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
if (table == NULL)
return NULL;
read_lock_bh(&table->tb6_lock);
fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
if (!fn)
goto out;
for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
if (rt->dst.dev->ifindex != dev->ifindex)
continue;
if ((rt->rt6i_flags & flags) != flags)
continue;
if ((rt->rt6i_flags & noflags) != 0)
continue;
dst_hold(&rt->dst);
break;
}
out:
read_unlock_bh(&table->tb6_lock);
return rt;
}
/* Create "default" multicast route to the interface */
static void addrconf_add_mroute(struct net_device *dev)
{
struct fib6_config cfg = {
.fc_table = RT6_TABLE_LOCAL,
.fc_metric = IP6_RT_PRIO_ADDRCONF,
.fc_ifindex = dev->ifindex,
.fc_dst_len = 8,
.fc_flags = RTF_UP,
.fc_nlinfo.nl_net = dev_net(dev),
};
ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
ip6_route_add(&cfg);
}
#if IS_ENABLED(CONFIG_IPV6_SIT)
static void sit_route_add(struct net_device *dev)
{
struct fib6_config cfg = {
.fc_table = RT6_TABLE_MAIN,
.fc_metric = IP6_RT_PRIO_ADDRCONF,
.fc_ifindex = dev->ifindex,
.fc_dst_len = 96,
.fc_flags = RTF_UP | RTF_NONEXTHOP,
.fc_nlinfo.nl_net = dev_net(dev),
};
/* prefix length - 96 bits "::d.d.d.d" */
ip6_route_add(&cfg);
}
#endif
static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
idev = ipv6_find_idev(dev);
if (!idev)
return ERR_PTR(-ENOBUFS);
if (idev->cnf.disable_ipv6)
return ERR_PTR(-EACCES);
/* Add default multicast route */
if (!(dev->flags & IFF_LOOPBACK))
addrconf_add_mroute(dev);
return idev;
}
void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
{
struct prefix_info *pinfo;
__u32 valid_lft;
__u32 prefered_lft;
int addr_type;
struct inet6_dev *in6_dev;
struct net *net = dev_net(dev);
pinfo = (struct prefix_info *) opt;
if (len < sizeof(struct prefix_info)) {
ADBG(("addrconf: prefix option too short\n"));
return;
}
/*
* Validation checks ([ADDRCONF], page 19)
*/
addr_type = ipv6_addr_type(&pinfo->prefix);
if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
return;
valid_lft = ntohl(pinfo->valid);
prefered_lft = ntohl(pinfo->prefered);
if (prefered_lft > valid_lft) {
net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
return;
}
in6_dev = in6_dev_get(dev);
if (in6_dev == NULL) {
net_dbg_ratelimited("addrconf: device %s not configured\n",
dev->name);
return;
}
/*
* Two things going on here:
* 1) Add routes for on-link prefixes
* 2) Configure prefixes with the auto flag set
*/
if (pinfo->onlink) {
struct rt6_info *rt;
unsigned long rt_expires;
/* Avoid arithmetic overflow. Really, we could
* save rt_expires in seconds, likely valid_lft,
* but it would require division in fib gc, that it
* not good.
*/
if (HZ > USER_HZ)
rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
else
rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
if (addrconf_finite_timeout(rt_expires))
rt_expires *= HZ;
rt = addrconf_get_prefix_route(&pinfo->prefix,
pinfo->prefix_len,
dev,
RTF_ADDRCONF | RTF_PREFIX_RT,
RTF_GATEWAY | RTF_DEFAULT);
if (rt) {
/* Autoconf prefix route */
if (valid_lft == 0) {
ip6_del_rt(rt);
rt = NULL;
} else if (addrconf_finite_timeout(rt_expires)) {
/* not infinity */
rt6_set_expires(rt, jiffies + rt_expires);
} else {
rt6_clean_expires(rt);
}
} else if (valid_lft) {
clock_t expires = 0;
int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
if (addrconf_finite_timeout(rt_expires)) {
/* not infinity */
flags |= RTF_EXPIRES;
expires = jiffies_to_clock_t(rt_expires);
}
addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
dev, expires, flags);
}
ip6_rt_put(rt);
}
/* Try to figure out our local address for this prefix */
if (pinfo->autoconf && in6_dev->cnf.autoconf) {
struct inet6_ifaddr *ifp;
struct in6_addr addr;
int create = 0, update_lft = 0;
if (pinfo->prefix_len == 64) {
memcpy(&addr, &pinfo->prefix, 8);
if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
in6_dev_put(in6_dev);
return;
}
goto ok;
}
net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
pinfo->prefix_len);
in6_dev_put(in6_dev);
return;
ok:
ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
if (ifp == NULL && valid_lft) {
int max_addresses = in6_dev->cnf.max_addresses;
u32 addr_flags = 0;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
if (in6_dev->cnf.optimistic_dad &&
!net->ipv6.devconf_all->forwarding && sllao)
addr_flags = IFA_F_OPTIMISTIC;
#endif
/* Do not allow to create too much of autoconfigured
* addresses; this would be too easy way to crash kernel.
*/
if (!max_addresses ||
ipv6_count_addresses(in6_dev) < max_addresses)
ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
addr_type&IPV6_ADDR_SCOPE_MASK,
addr_flags);
if (IS_ERR_OR_NULL(ifp)) {
in6_dev_put(in6_dev);
return;
}
update_lft = create = 1;
ifp->cstamp = jiffies;
addrconf_dad_start(ifp);
}
if (ifp) {
int flags;
unsigned long now;
#ifdef CONFIG_IPV6_PRIVACY
struct inet6_ifaddr *ift;
#endif
u32 stored_lft;
/* update lifetime (RFC2462 5.5.3 e) */
spin_lock(&ifp->lock);
now = jiffies;
if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
else
stored_lft = 0;
if (!update_lft && stored_lft) {
if (valid_lft > MIN_VALID_LIFETIME ||
valid_lft > stored_lft)
update_lft = 1;
else if (stored_lft <= MIN_VALID_LIFETIME) {
/* valid_lft <= stored_lft is always true */
IPv6: preferred lifetime of address not getting updated There's a bug in addrconf_prefix_rcv() where it won't update the preferred lifetime of an IPv6 address if the current valid lifetime of the address is less than 2 hours (the minimum value in the RA). For example, If I send a router advertisement with a prefix that has valid lifetime = preferred lifetime = 2 hours we'll build this address: 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic valid_lft 7175sec preferred_lft 7175sec If I then send the same prefix with valid lifetime = preferred lifetime = 0 it will be ignored since the minimum valid lifetime is 2 hours: 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic valid_lft 7161sec preferred_lft 7161sec But according to RFC 4862 we should always reset the preferred lifetime even if the valid lifetime is invalid, which would cause the address to immediately get deprecated. So with this patch we'd see this: 5: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:21f:29ff:fe5a:ef04/64 scope global deprecated dynamic valid_lft 7163sec preferred_lft 0sec The comment winds-up being 5x the size of the code to fix the problem. Update the preferred lifetime of IPv6 addresses derived from a prefix info option in a router advertisement even if the valid lifetime in the option is invalid, as specified in RFC 4862 Section 5.5.3e. Fixes an issue where an address will not immediately become deprecated. Reported by Jens Rosenboom. Signed-off-by: Brian Haley <brian.haley@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-07-02 07:10:52 +00:00
/*
* RFC 4862 Section 5.5.3e:
* "Note that the preferred lifetime of
* the corresponding address is always
* reset to the Preferred Lifetime in
* the received Prefix Information
* option, regardless of whether the
* valid lifetime is also reset or
* ignored."
*
* So if the preferred lifetime in
* this advertisement is different
* than what we have stored, but the
* valid lifetime is invalid, just
* reset prefered_lft.
*
* We must set the valid lifetime
* to the stored lifetime since we'll
* be updating the timestamp below,
* else we'll set it back to the
* minimum.
IPv6: preferred lifetime of address not getting updated There's a bug in addrconf_prefix_rcv() where it won't update the preferred lifetime of an IPv6 address if the current valid lifetime of the address is less than 2 hours (the minimum value in the RA). For example, If I send a router advertisement with a prefix that has valid lifetime = preferred lifetime = 2 hours we'll build this address: 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic valid_lft 7175sec preferred_lft 7175sec If I then send the same prefix with valid lifetime = preferred lifetime = 0 it will be ignored since the minimum valid lifetime is 2 hours: 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic valid_lft 7161sec preferred_lft 7161sec But according to RFC 4862 we should always reset the preferred lifetime even if the valid lifetime is invalid, which would cause the address to immediately get deprecated. So with this patch we'd see this: 5: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:21f:29ff:fe5a:ef04/64 scope global deprecated dynamic valid_lft 7163sec preferred_lft 0sec The comment winds-up being 5x the size of the code to fix the problem. Update the preferred lifetime of IPv6 addresses derived from a prefix info option in a router advertisement even if the valid lifetime in the option is invalid, as specified in RFC 4862 Section 5.5.3e. Fixes an issue where an address will not immediately become deprecated. Reported by Jens Rosenboom. Signed-off-by: Brian Haley <brian.haley@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-07-02 07:10:52 +00:00
*/
if (prefered_lft != ifp->prefered_lft) {
valid_lft = stored_lft;
update_lft = 1;
}
} else {
valid_lft = MIN_VALID_LIFETIME;
if (valid_lft < prefered_lft)
prefered_lft = valid_lft;
update_lft = 1;
}
}
if (update_lft) {
ifp->valid_lft = valid_lft;
ifp->prefered_lft = prefered_lft;
ifp->tstamp = now;
flags = ifp->flags;
ifp->flags &= ~IFA_F_DEPRECATED;
spin_unlock(&ifp->lock);
if (!(flags&IFA_F_TENTATIVE))
ipv6_ifa_notify(0, ifp);
} else
spin_unlock(&ifp->lock);
#ifdef CONFIG_IPV6_PRIVACY
read_lock_bh(&in6_dev->lock);
/* update all temporary addresses in the list */
list_for_each_entry(ift, &in6_dev->tempaddr_list,
tmp_list) {
int age, max_valid, max_prefered;
if (ifp != ift->ifpub)
continue;
/*
* RFC 4941 section 3.3:
* If a received option will extend the lifetime
* of a public address, the lifetimes of
* temporary addresses should be extended,
* subject to the overall constraint that no
* temporary addresses should ever remain
* "valid" or "preferred" for a time longer than
* (TEMP_VALID_LIFETIME) or
* (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
* respectively.
*/
age = (now - ift->cstamp) / HZ;
max_valid = in6_dev->cnf.temp_valid_lft - age;
if (max_valid < 0)
max_valid = 0;
max_prefered = in6_dev->cnf.temp_prefered_lft -
in6_dev->cnf.max_desync_factor -
age;
if (max_prefered < 0)
max_prefered = 0;
if (valid_lft > max_valid)
valid_lft = max_valid;
if (prefered_lft > max_prefered)
prefered_lft = max_prefered;
spin_lock(&ift->lock);
flags = ift->flags;
ift->valid_lft = valid_lft;
ift->prefered_lft = prefered_lft;
ift->tstamp = now;
if (prefered_lft > 0)
ift->flags &= ~IFA_F_DEPRECATED;
spin_unlock(&ift->lock);
if (!(flags&IFA_F_TENTATIVE))
ipv6_ifa_notify(0, ift);
}
if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
/*
* When a new public address is created as
* described in [ADDRCONF], also create a new
* temporary address. Also create a temporary
* address if it's enabled but no temporary
* address currently exists.
*/
read_unlock_bh(&in6_dev->lock);
ipv6_create_tempaddr(ifp, NULL);
} else {
read_unlock_bh(&in6_dev->lock);
}
#endif
in6_ifa_put(ifp);
addrconf_verify(0);
}
}
inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
in6_dev_put(in6_dev);
}
/*
* Set destination address.
* Special case for SIT interfaces where we create a new "virtual"
* device.
*/
int addrconf_set_dstaddr(struct net *net, void __user *arg)
{
struct in6_ifreq ireq;
struct net_device *dev;
int err = -EINVAL;
rtnl_lock();
err = -EFAULT;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
goto err_exit;
dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
err = -ENODEV;
if (dev == NULL)
goto err_exit;
#if IS_ENABLED(CONFIG_IPV6_SIT)
if (dev->type == ARPHRD_SIT) {
const struct net_device_ops *ops = dev->netdev_ops;
struct ifreq ifr;
struct ip_tunnel_parm p;
err = -EADDRNOTAVAIL;
if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
goto err_exit;
memset(&p, 0, sizeof(p));
p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
p.iph.saddr = 0;
p.iph.version = 4;
p.iph.ihl = 5;
p.iph.protocol = IPPROTO_IPV6;
p.iph.ttl = 64;
ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
if (ops->ndo_do_ioctl) {
mm_segment_t oldfs = get_fs();
set_fs(KERNEL_DS);
err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
set_fs(oldfs);
} else
err = -EOPNOTSUPP;
if (err == 0) {
err = -ENOBUFS;
dev = __dev_get_by_name(net, p.name);
if (!dev)
goto err_exit;
err = dev_open(dev);
}
}
#endif
err_exit:
rtnl_unlock();
return err;
}
/*
* Manual configuration of address on an interface
*/
static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
__u32 valid_lft)
{
struct inet6_ifaddr *ifp;
struct inet6_dev *idev;
struct net_device *dev;
int scope;
u32 flags;
clock_t expires;
unsigned long timeout;
ASSERT_RTNL();
if (plen > 128)
return -EINVAL;
/* check the lifetime */
if (!valid_lft || prefered_lft > valid_lft)
return -EINVAL;
dev = __dev_get_by_index(net, ifindex);
if (!dev)
return -ENODEV;
idev = addrconf_add_dev(dev);
if (IS_ERR(idev))
return PTR_ERR(idev);
scope = ipv6_addr_scope(pfx);
timeout = addrconf_timeout_fixup(valid_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
expires = jiffies_to_clock_t(timeout * HZ);
valid_lft = timeout;
flags = RTF_EXPIRES;
} else {
expires = 0;
flags = 0;
ifa_flags |= IFA_F_PERMANENT;
}
timeout = addrconf_timeout_fixup(prefered_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
if (timeout == 0)
ifa_flags |= IFA_F_DEPRECATED;
prefered_lft = timeout;
}
ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
if (!IS_ERR(ifp)) {
spin_lock_bh(&ifp->lock);
ifp->valid_lft = valid_lft;
ifp->prefered_lft = prefered_lft;
ifp->tstamp = jiffies;
spin_unlock_bh(&ifp->lock);
addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
expires, flags);
/*
* Note that section 3.1 of RFC 4429 indicates
* that the Optimistic flag should not be set for
* manually configured addresses
*/
addrconf_dad_start(ifp);
in6_ifa_put(ifp);
addrconf_verify(0);
return 0;
}
return PTR_ERR(ifp);
}
static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
unsigned int plen)
{
struct inet6_ifaddr *ifp;
struct inet6_dev *idev;
struct net_device *dev;
if (plen > 128)
return -EINVAL;
dev = __dev_get_by_index(net, ifindex);
if (!dev)
return -ENODEV;
if ((idev = __in6_dev_get(dev)) == NULL)
return -ENXIO;
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list) {
if (ifp->prefix_len == plen &&
ipv6_addr_equal(pfx, &ifp->addr)) {
in6_ifa_hold(ifp);
read_unlock_bh(&idev->lock);
ipv6_del_addr(ifp);
/* If the last address is deleted administratively,
disable IPv6 on this interface.
*/
if (list_empty(&idev->addr_list))
addrconf_ifdown(idev->dev, 1);
return 0;
}
}
read_unlock_bh(&idev->lock);
return -EADDRNOTAVAIL;
}
int addrconf_add_ifaddr(struct net *net, void __user *arg)
{
struct in6_ifreq ireq;
int err;
net: Allow userns root to control ipv6 Allow an unpriviled user who has created a user namespace, and then created a network namespace to effectively use the new network namespace, by reducing capable(CAP_NET_ADMIN) and capable(CAP_NET_RAW) calls to be ns_capable(net->user_ns, CAP_NET_ADMIN), or capable(net->user_ns, CAP_NET_RAW) calls. Settings that merely control a single network device are allowed. Either the network device is a logical network device where restrictions make no difference or the network device is hardware NIC that has been explicity moved from the initial network namespace. In general policy and network stack state changes are allowed while resource control is left unchanged. Allow the SIOCSIFADDR ioctl to add ipv6 addresses. Allow the SIOCDIFADDR ioctl to delete ipv6 addresses. Allow the SIOCADDRT ioctl to add ipv6 routes. Allow the SIOCDELRT ioctl to delete ipv6 routes. Allow creation of ipv6 raw sockets. Allow setting the IPV6_JOIN_ANYCAST socket option. Allow setting the IPV6_FL_A_RENEW parameter of the IPV6_FLOWLABEL_MGR socket option. Allow setting the IPV6_TRANSPARENT socket option. Allow setting the IPV6_HOPOPTS socket option. Allow setting the IPV6_RTHDRDSTOPTS socket option. Allow setting the IPV6_DSTOPTS socket option. Allow setting the IPV6_IPSEC_POLICY socket option. Allow setting the IPV6_XFRM_POLICY socket option. Allow sending packets with the IPV6_2292HOPOPTS control message. Allow sending packets with the IPV6_2292DSTOPTS control message. Allow sending packets with the IPV6_RTHDRDSTOPTS control message. Allow setting the multicast routing socket options on non multicast routing sockets. Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, and SIOCDELTUNNEL ioctls for setting up, changing and deleting tunnels over ipv6. Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, SIOCDELTUNNEL ioctls for setting up, changing and deleting ipv6 over ipv4 tunnels. Allow the SIOCADDPRL, SIOCDELPRL, SIOCCHGPRL ioctls for adding, deleting, and changing the potential router list for ISATAP tunnels. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-16 03:03:06 +00:00
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
return -EFAULT;
rtnl_lock();
err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
ireq.ifr6_prefixlen, IFA_F_PERMANENT,
INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
rtnl_unlock();
return err;
}
int addrconf_del_ifaddr(struct net *net, void __user *arg)
{
struct in6_ifreq ireq;
int err;
net: Allow userns root to control ipv6 Allow an unpriviled user who has created a user namespace, and then created a network namespace to effectively use the new network namespace, by reducing capable(CAP_NET_ADMIN) and capable(CAP_NET_RAW) calls to be ns_capable(net->user_ns, CAP_NET_ADMIN), or capable(net->user_ns, CAP_NET_RAW) calls. Settings that merely control a single network device are allowed. Either the network device is a logical network device where restrictions make no difference or the network device is hardware NIC that has been explicity moved from the initial network namespace. In general policy and network stack state changes are allowed while resource control is left unchanged. Allow the SIOCSIFADDR ioctl to add ipv6 addresses. Allow the SIOCDIFADDR ioctl to delete ipv6 addresses. Allow the SIOCADDRT ioctl to add ipv6 routes. Allow the SIOCDELRT ioctl to delete ipv6 routes. Allow creation of ipv6 raw sockets. Allow setting the IPV6_JOIN_ANYCAST socket option. Allow setting the IPV6_FL_A_RENEW parameter of the IPV6_FLOWLABEL_MGR socket option. Allow setting the IPV6_TRANSPARENT socket option. Allow setting the IPV6_HOPOPTS socket option. Allow setting the IPV6_RTHDRDSTOPTS socket option. Allow setting the IPV6_DSTOPTS socket option. Allow setting the IPV6_IPSEC_POLICY socket option. Allow setting the IPV6_XFRM_POLICY socket option. Allow sending packets with the IPV6_2292HOPOPTS control message. Allow sending packets with the IPV6_2292DSTOPTS control message. Allow sending packets with the IPV6_RTHDRDSTOPTS control message. Allow setting the multicast routing socket options on non multicast routing sockets. Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, and SIOCDELTUNNEL ioctls for setting up, changing and deleting tunnels over ipv6. Allow the SIOCADDTUNNEL, SIOCCHGTUNNEL, SIOCDELTUNNEL ioctls for setting up, changing and deleting ipv6 over ipv4 tunnels. Allow the SIOCADDPRL, SIOCDELPRL, SIOCCHGPRL ioctls for adding, deleting, and changing the potential router list for ISATAP tunnels. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-16 03:03:06 +00:00
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
return -EFAULT;
rtnl_lock();
err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
ireq.ifr6_prefixlen);
rtnl_unlock();
return err;
}
static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
int plen, int scope)
{
struct inet6_ifaddr *ifp;
ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
if (!IS_ERR(ifp)) {
spin_lock_bh(&ifp->lock);
ifp->flags &= ~IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
ipv6_ifa_notify(RTM_NEWADDR, ifp);
in6_ifa_put(ifp);
}
}
#if IS_ENABLED(CONFIG_IPV6_SIT)
static void sit_add_v4_addrs(struct inet6_dev *idev)
{
struct in6_addr addr;
struct net_device *dev;
struct net *net = dev_net(idev->dev);
int scope;
ASSERT_RTNL();
memset(&addr, 0, sizeof(struct in6_addr));
memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
if (idev->dev->flags&IFF_POINTOPOINT) {
addr.s6_addr32[0] = htonl(0xfe800000);
scope = IFA_LINK;
} else {
scope = IPV6_ADDR_COMPATv4;
}
if (addr.s6_addr32[3]) {
add_addr(idev, &addr, 128, scope);
return;
}
for_each_netdev(net, dev) {
struct in_device *in_dev = __in_dev_get_rtnl(dev);
if (in_dev && (dev->flags & IFF_UP)) {
struct in_ifaddr *ifa;
int flag = scope;
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
int plen;
addr.s6_addr32[3] = ifa->ifa_local;
if (ifa->ifa_scope == RT_SCOPE_LINK)
continue;
if (ifa->ifa_scope >= RT_SCOPE_HOST) {
if (idev->dev->flags&IFF_POINTOPOINT)
continue;
flag |= IFA_HOST;
}
if (idev->dev->flags&IFF_POINTOPOINT)
plen = 64;
else
plen = 96;
add_addr(idev, &addr, plen, flag);
}
}
}
}
#endif
static void init_loopback(struct net_device *dev)
{
struct inet6_dev *idev;
/* ::1 */
ASSERT_RTNL();
if ((idev = ipv6_find_idev(dev)) == NULL) {
pr_debug("%s: add_dev failed\n", __func__);
return;
}
add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
}
static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
{
struct inet6_ifaddr *ifp;
u32 addr_flags = IFA_F_PERMANENT;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
if (idev->cnf.optimistic_dad &&
!dev_net(idev->dev)->ipv6.devconf_all->forwarding)
addr_flags |= IFA_F_OPTIMISTIC;
#endif
ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
if (!IS_ERR(ifp)) {
addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
addrconf_dad_start(ifp);
in6_ifa_put(ifp);
}
}
static void addrconf_dev_config(struct net_device *dev)
{
struct in6_addr addr;
struct inet6_dev *idev;
ASSERT_RTNL();
if ((dev->type != ARPHRD_ETHER) &&
(dev->type != ARPHRD_FDDI) &&
(dev->type != ARPHRD_ARCNET) &&
(dev->type != ARPHRD_INFINIBAND) &&
(dev->type != ARPHRD_IEEE802154)) {
/* Alas, we support only Ethernet autoconfiguration. */
return;
}
idev = addrconf_add_dev(dev);
if (IS_ERR(idev))
return;
memset(&addr, 0, sizeof(struct in6_addr));
addr.s6_addr32[0] = htonl(0xFE800000);
if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
addrconf_add_linklocal(idev, &addr);
}
#if IS_ENABLED(CONFIG_IPV6_SIT)
static void addrconf_sit_config(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
/*
* Configure the tunnel with one of our IPv4
* addresses... we should configure all of
* our v4 addrs in the tunnel
*/
if ((idev = ipv6_find_idev(dev)) == NULL) {
pr_debug("%s: add_dev failed\n", __func__);
return;
}
if (dev->priv_flags & IFF_ISATAP) {
struct in6_addr addr;
ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
addrconf_prefix_route(&addr, 64, dev, 0, 0);
if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
addrconf_add_linklocal(idev, &addr);
return;
}
sit_add_v4_addrs(idev);
if (dev->flags&IFF_POINTOPOINT)
addrconf_add_mroute(dev);
else
sit_route_add(dev);
}
#endif
#if IS_ENABLED(CONFIG_NET_IPGRE)
static void addrconf_gre_config(struct net_device *dev)
{
struct inet6_dev *idev;
struct in6_addr addr;
pr_info("%s(%s)\n", __func__, dev->name);
ASSERT_RTNL();
if ((idev = ipv6_find_idev(dev)) == NULL) {
pr_debug("%s: add_dev failed\n", __func__);
return;
}
ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
addrconf_prefix_route(&addr, 64, dev, 0, 0);
if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
addrconf_add_linklocal(idev, &addr);
}
#endif
static inline int
ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
{
struct in6_addr lladdr;
if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
addrconf_add_linklocal(idev, &lladdr);
return 0;
}
return -1;
}
static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
{
struct net_device *link_dev;
struct net *net = dev_net(idev->dev);
/* first try to inherit the link-local address from the link device */
if (idev->dev->iflink &&
(link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
if (!ipv6_inherit_linklocal(idev, link_dev))
return;
}
/* then try to inherit it from any device */
for_each_netdev(net, link_dev) {
if (!ipv6_inherit_linklocal(idev, link_dev))
return;
}
pr_debug("init ip6-ip6: add_linklocal failed\n");
}
/*
* Autoconfigure tunnel with a link-local address so routing protocols,
* DHCPv6, MLD etc. can be run over the virtual link
*/
static void addrconf_ip6_tnl_config(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
idev = addrconf_add_dev(dev);
if (IS_ERR(idev)) {
pr_debug("init ip6-ip6: add_dev failed\n");
return;
}
ip6_tnl_add_linklocal(idev);
}
static int addrconf_notify(struct notifier_block *this, unsigned long event,
void *data)
{
struct net_device *dev = (struct net_device *) data;
struct inet6_dev *idev = __in6_dev_get(dev);
int run_pending = 0;
int err;
switch (event) {
case NETDEV_REGISTER:
if (!idev && dev->mtu >= IPV6_MIN_MTU) {
idev = ipv6_add_dev(dev);
if (!idev)
return notifier_from_errno(-ENOMEM);
}
break;
case NETDEV_UP:
case NETDEV_CHANGE:
if (dev->flags & IFF_SLAVE)
break;
if (event == NETDEV_UP) {
if (!addrconf_qdisc_ok(dev)) {
/* device is not ready yet. */
pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
dev->name);
break;
}
if (!idev && dev->mtu >= IPV6_MIN_MTU)
idev = ipv6_add_dev(dev);
ipv6: fix run pending DAD when interface becomes ready With some net devices types, an IPv6 address configured while the interface was down can stay 'tentative' forever, even after the interface is set up. In some case, pending IPv6 DADs are not executed when the device becomes ready. I observed this while doing some tests with kvm. If I assign an IPv6 address to my interface eth0 (kvm driver rtl8139) when it is still down then the address is flagged tentative (IFA_F_TENTATIVE). Then, I set eth0 up, and to my surprise, the address stays 'tentative', no DAD is executed and the address can't be pinged. I also observed the same behaviour, without kvm, with virtual interfaces types macvlan and veth. Some easy steps to reproduce the issue with macvlan: 1. ip link add link eth0 type macvlan 2. ip -6 addr add 2003::ab32/64 dev macvlan0 3. ip addr show dev macvlan0 ... inet6 2003::ab32/64 scope global tentative ... 4. ip link set macvlan0 up 5. ip addr show dev macvlan0 ... inet6 2003::ab32/64 scope global tentative ... Address is still tentative I think there's a bug in net/ipv6/addrconf.c, addrconf_notify(): addrconf_dad_run() is not always run when the interface is flagged IF_READY. Currently it is only run when receiving NETDEV_CHANGE event. Looks like some (virtual) devices doesn't send this event when becoming up. For both NETDEV_UP and NETDEV_CHANGE events, when the interface becomes ready, run_pending should be set to 1. Patch below. 'run_pending = 1' could be moved below the if/else block but it makes the code less readable. Signed-off-by: Benjamin Thery <benjamin.thery@bull.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-05 09:43:57 +00:00
if (idev) {
idev->if_flags |= IF_READY;
ipv6: fix run pending DAD when interface becomes ready With some net devices types, an IPv6 address configured while the interface was down can stay 'tentative' forever, even after the interface is set up. In some case, pending IPv6 DADs are not executed when the device becomes ready. I observed this while doing some tests with kvm. If I assign an IPv6 address to my interface eth0 (kvm driver rtl8139) when it is still down then the address is flagged tentative (IFA_F_TENTATIVE). Then, I set eth0 up, and to my surprise, the address stays 'tentative', no DAD is executed and the address can't be pinged. I also observed the same behaviour, without kvm, with virtual interfaces types macvlan and veth. Some easy steps to reproduce the issue with macvlan: 1. ip link add link eth0 type macvlan 2. ip -6 addr add 2003::ab32/64 dev macvlan0 3. ip addr show dev macvlan0 ... inet6 2003::ab32/64 scope global tentative ... 4. ip link set macvlan0 up 5. ip addr show dev macvlan0 ... inet6 2003::ab32/64 scope global tentative ... Address is still tentative I think there's a bug in net/ipv6/addrconf.c, addrconf_notify(): addrconf_dad_run() is not always run when the interface is flagged IF_READY. Currently it is only run when receiving NETDEV_CHANGE event. Looks like some (virtual) devices doesn't send this event when becoming up. For both NETDEV_UP and NETDEV_CHANGE events, when the interface becomes ready, run_pending should be set to 1. Patch below. 'run_pending = 1' could be moved below the if/else block but it makes the code less readable. Signed-off-by: Benjamin Thery <benjamin.thery@bull.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-05 09:43:57 +00:00
run_pending = 1;
}
} else {
if (!addrconf_qdisc_ok(dev)) {
/* device is still not ready. */
break;
}
if (idev) {
if (idev->if_flags & IF_READY)
/* device is already configured. */
break;
idev->if_flags |= IF_READY;
}
pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
dev->name);
run_pending = 1;
}
switch (dev->type) {
#if IS_ENABLED(CONFIG_IPV6_SIT)
case ARPHRD_SIT:
addrconf_sit_config(dev);
break;
#endif
#if IS_ENABLED(CONFIG_NET_IPGRE)
case ARPHRD_IPGRE:
addrconf_gre_config(dev);
break;
#endif
case ARPHRD_TUNNEL6:
addrconf_ip6_tnl_config(dev);
break;
case ARPHRD_LOOPBACK:
init_loopback(dev);
break;
default:
addrconf_dev_config(dev);
break;
}
if (idev) {
if (run_pending)
addrconf_dad_run(idev);
/*
* If the MTU changed during the interface down,
* when the interface up, the changed MTU must be
* reflected in the idev as well as routers.
*/
if (idev->cnf.mtu6 != dev->mtu &&
dev->mtu >= IPV6_MIN_MTU) {
rt6_mtu_change(dev, dev->mtu);
idev->cnf.mtu6 = dev->mtu;
}
idev->tstamp = jiffies;
inet6_ifinfo_notify(RTM_NEWLINK, idev);
/*
* If the changed mtu during down is lower than
* IPV6_MIN_MTU stop IPv6 on this interface.
*/
if (dev->mtu < IPV6_MIN_MTU)
addrconf_ifdown(dev, 1);
}
break;
case NETDEV_CHANGEMTU:
if (idev && dev->mtu >= IPV6_MIN_MTU) {
rt6_mtu_change(dev, dev->mtu);
idev->cnf.mtu6 = dev->mtu;
break;
}
if (!idev && dev->mtu >= IPV6_MIN_MTU) {
idev = ipv6_add_dev(dev);
if (idev)
break;
}
/*
* MTU falled under IPV6_MIN_MTU.
* Stop IPv6 on this interface.
*/
case NETDEV_DOWN:
case NETDEV_UNREGISTER:
/*
* Remove all addresses from this interface.
*/
addrconf_ifdown(dev, event != NETDEV_DOWN);
break;
case NETDEV_CHANGENAME:
if (idev) {
snmp6_unregister_dev(idev);
addrconf_sysctl_unregister(idev);
addrconf_sysctl_register(idev);
err = snmp6_register_dev(idev);
if (err)
return notifier_from_errno(err);
}
break;
case NETDEV_PRE_TYPE_CHANGE:
case NETDEV_POST_TYPE_CHANGE:
addrconf_type_change(dev, event);
break;
}
return NOTIFY_OK;
}
/*
* addrconf module should be notified of a device going up
*/
static struct notifier_block ipv6_dev_notf = {
.notifier_call = addrconf_notify,
};
static void addrconf_type_change(struct net_device *dev, unsigned long event)
{
struct inet6_dev *idev;
ASSERT_RTNL();
idev = __in6_dev_get(dev);
if (event == NETDEV_POST_TYPE_CHANGE)
ipv6_mc_remap(idev);
else if (event == NETDEV_PRE_TYPE_CHANGE)
ipv6_mc_unmap(idev);
}
static int addrconf_ifdown(struct net_device *dev, int how)
{
struct net *net = dev_net(dev);
struct inet6_dev *idev;
struct inet6_ifaddr *ifa;
2011-01-24 07:27:15 +00:00
int state, i;
ASSERT_RTNL();
2011-01-24 07:27:15 +00:00
rt6_ifdown(net, dev);
neigh_ifdown(&nd_tbl, dev);
idev = __in6_dev_get(dev);
if (idev == NULL)
return -ENODEV;
/*
* Step 1: remove reference to ipv6 device from parent device.
* Do not dev_put!
*/
if (how) {
idev->dead = 1;
/* protected by rtnl_lock */
RCU_INIT_POINTER(dev->ip6_ptr, NULL);
/* Step 1.5: remove snmp6 entry */
snmp6_unregister_dev(idev);
}
2011-01-24 07:27:15 +00:00
/* Step 2: clear hash table */
for (i = 0; i < IN6_ADDR_HSIZE; i++) {
struct hlist_head *h = &inet6_addr_lst[i];
struct hlist_node *n;
spin_lock_bh(&addrconf_hash_lock);
restart:
hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
if (ifa->idev == idev) {
hlist_del_init_rcu(&ifa->addr_lst);
addrconf_del_timer(ifa);
goto restart;
}
}
spin_unlock_bh(&addrconf_hash_lock);
}
write_lock_bh(&idev->lock);
/* Step 2: clear flags for stateless addrconf */
if (!how)
idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
#ifdef CONFIG_IPV6_PRIVACY
if (how && del_timer(&idev->regen_timer))
in6_dev_put(idev);
/* Step 3: clear tempaddr list */
while (!list_empty(&idev->tempaddr_list)) {
ifa = list_first_entry(&idev->tempaddr_list,
struct inet6_ifaddr, tmp_list);
list_del(&ifa->tmp_list);
write_unlock_bh(&idev->lock);
spin_lock_bh(&ifa->lock);
if (ifa->ifpub) {
in6_ifa_put(ifa->ifpub);
ifa->ifpub = NULL;
}
spin_unlock_bh(&ifa->lock);
in6_ifa_put(ifa);
write_lock_bh(&idev->lock);
}
#endif
while (!list_empty(&idev->addr_list)) {
ifa = list_first_entry(&idev->addr_list,
struct inet6_ifaddr, if_list);
addrconf_del_timer(ifa);
2011-01-24 07:27:15 +00:00
list_del(&ifa->if_list);
2011-01-24 07:27:15 +00:00
write_unlock_bh(&idev->lock);
2011-01-24 07:27:15 +00:00
spin_lock_bh(&ifa->state_lock);
state = ifa->state;
ifa->state = INET6_IFADDR_STATE_DEAD;
spin_unlock_bh(&ifa->state_lock);
2011-01-24 07:27:15 +00:00
if (state != INET6_IFADDR_STATE_DEAD) {
__ipv6_ifa_notify(RTM_DELADDR, ifa);
atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
}
2011-01-24 07:27:15 +00:00
in6_ifa_put(ifa);
2011-01-24 07:27:15 +00:00
write_lock_bh(&idev->lock);
}
write_unlock_bh(&idev->lock);
/* Step 5: Discard multicast list */
if (how)
ipv6_mc_destroy_dev(idev);
else
ipv6_mc_down(idev);
idev->tstamp = jiffies;
/* Last: Shot the device (if unregistered) */
if (how) {
addrconf_sysctl_unregister(idev);
neigh_parms_release(&nd_tbl, idev->nd_parms);
neigh_ifdown(&nd_tbl, dev);
in6_dev_put(idev);
}
return 0;
}
static void addrconf_rs_timer(unsigned long data)
{
struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
struct inet6_dev *idev = ifp->idev;
read_lock(&idev->lock);
if (idev->dead || !(idev->if_flags & IF_READY))
goto out;
if (!ipv6_accept_ra(idev))
goto out;
/* Announcement received after solicitation was sent */
if (idev->if_flags & IF_RA_RCVD)
goto out;
spin_lock(&ifp->lock);
if (ifp->probes++ < idev->cnf.rtr_solicits) {
/* The wait after the last probe can be shorter */
addrconf_mod_timer(ifp, AC_RS,
(ifp->probes == idev->cnf.rtr_solicits) ?
idev->cnf.rtr_solicit_delay :
idev->cnf.rtr_solicit_interval);
spin_unlock(&ifp->lock);
ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
} else {
spin_unlock(&ifp->lock);
/*
* Note: we do not support deprecated "all on-link"
* assumption any longer.
*/
pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
}
out:
read_unlock(&idev->lock);
in6_ifa_put(ifp);
}
/*
* Duplicate Address Detection
*/
static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
{
unsigned long rand_num;
struct inet6_dev *idev = ifp->idev;
if (ifp->flags & IFA_F_OPTIMISTIC)
rand_num = 0;
else
rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
ifp->probes = idev->cnf.dad_transmits;
addrconf_mod_timer(ifp, AC_DAD, rand_num);
}
static void addrconf_dad_start(struct inet6_ifaddr *ifp)
{
struct inet6_dev *idev = ifp->idev;
struct net_device *dev = idev->dev;
addrconf_join_solict(dev, &ifp->addr);
net_srandom(ifp->addr.s6_addr32[3]);
read_lock_bh(&idev->lock);
spin_lock(&ifp->lock);
if (ifp->state == INET6_IFADDR_STATE_DEAD)
goto out;
if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
idev->cnf.accept_dad < 1 ||
!(ifp->flags&IFA_F_TENTATIVE) ||
ifp->flags & IFA_F_NODAD) {
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
spin_unlock(&ifp->lock);
read_unlock_bh(&idev->lock);
addrconf_dad_completed(ifp);
return;
}
if (!(idev->if_flags & IF_READY)) {
spin_unlock(&ifp->lock);
read_unlock_bh(&idev->lock);
/*
* If the device is not ready:
* - keep it tentative if it is a permanent address.
* - otherwise, kill it.
*/
in6_ifa_hold(ifp);
addrconf_dad_stop(ifp, 0);
return;
}
/*
* Optimistic nodes can start receiving
* Frames right away
*/
if (ifp->flags & IFA_F_OPTIMISTIC)
ip6_ins_rt(ifp->rt);
addrconf_dad_kick(ifp);
out:
spin_unlock(&ifp->lock);
read_unlock_bh(&idev->lock);
}
static void addrconf_dad_timer(unsigned long data)
{
struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
struct inet6_dev *idev = ifp->idev;
struct in6_addr mcaddr;
if (!ifp->probes && addrconf_dad_end(ifp))
goto out;
read_lock(&idev->lock);
if (idev->dead || !(idev->if_flags & IF_READY)) {
read_unlock(&idev->lock);
goto out;
}
spin_lock(&ifp->lock);
if (ifp->state == INET6_IFADDR_STATE_DEAD) {
spin_unlock(&ifp->lock);
read_unlock(&idev->lock);
goto out;
}
if (ifp->probes == 0) {
/*
* DAD was successful
*/
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
spin_unlock(&ifp->lock);
read_unlock(&idev->lock);
addrconf_dad_completed(ifp);
goto out;
}
ifp->probes--;
addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
spin_unlock(&ifp->lock);
read_unlock(&idev->lock);
/* send a neighbour solicitation for our addr */
addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
out:
in6_ifa_put(ifp);
}
static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
{
struct net_device *dev = ifp->idev->dev;
/*
* Configure the address for reception. Now it is valid.
*/
ipv6_ifa_notify(RTM_NEWADDR, ifp);
ipv6: Send ICMPv6 RSes only when RAs are accepted This patch improves the logic determining when to send ICMPv6 Router Solicitations, so that they are 1) always sent when the kernel is accepting Router Advertisements, and 2) never sent when the kernel is not accepting RAs. In other words, the operational setting of the "accept_ra" sysctl is used. The change also makes the special "Hybrid Router" forwarding mode ("forwarding" sysctl set to 2) operate exactly the same as the standard Router mode (forwarding=1). The only difference between the two was that RSes was being sent in the Hybrid Router mode only. The sysctl documentation describing the special Hybrid Router mode has therefore been removed. Rationale for the change: Currently, the value of forwarding sysctl is the only thing determining whether or not to send RSes. If it has the value 0 or 2, they are sent, otherwise they are not. This leads to inconsistent behaviour in the following cases: * accept_ra=0, forwarding=0 * accept_ra=0, forwarding=2 * accept_ra=1, forwarding=2 * accept_ra=2, forwarding=1 In the first three cases, the kernel will send RSes, even though it will not accept any RAs received in reply. In the last case, it will not send any RSes, even though it will accept and process any RAs received. (Most routers will send unsolicited RAs periodically, so suppressing RSes in the last case will merely delay auto-configuration, not prevent it.) Also, it is my opinion that having the forwarding sysctl control RS sending behaviour (completely independent of whether RAs are being accepted or not) is simply not what most users would intuitively expect to be the case. Signed-off-by: Tore Anderson <tore@fud.no> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-28 23:47:33 +00:00
/* If added prefix is link local and we are prepared to process
router advertisements, start sending router solicitations.
*/
if (ipv6_accept_ra(ifp->idev) &&
ifp->idev->cnf.rtr_solicits > 0 &&
(dev->flags&IFF_LOOPBACK) == 0 &&
(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
/*
* If a host as already performed a random delay
* [...] as part of DAD [...] there is no need
* to delay again before sending the first RS
*/
ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
spin_lock_bh(&ifp->lock);
ifp->probes = 1;
ifp->idev->if_flags |= IF_RS_SENT;
addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
spin_unlock_bh(&ifp->lock);
}
}
static void addrconf_dad_run(struct inet6_dev *idev)
{
struct inet6_ifaddr *ifp;
read_lock_bh(&idev->lock);
list_for_each_entry(ifp, &idev->addr_list, if_list) {
spin_lock(&ifp->lock);
if (ifp->flags & IFA_F_TENTATIVE &&
ifp->state == INET6_IFADDR_STATE_DAD)
addrconf_dad_kick(ifp);
spin_unlock(&ifp->lock);
}
read_unlock_bh(&idev->lock);
}
#ifdef CONFIG_PROC_FS
struct if6_iter_state {
struct seq_net_private p;
int bucket;
int offset;
};
static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
{
struct inet6_ifaddr *ifa = NULL;
struct if6_iter_state *state = seq->private;
struct net *net = seq_file_net(seq);
int p = 0;
/* initial bucket if pos is 0 */
if (pos == 0) {
state->bucket = 0;
state->offset = 0;
}
for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
struct hlist_node *n;
hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
/* sync with offset */
if (p < state->offset) {
p++;
continue;
}
state->offset++;
return ifa;
}
/* prepare for next bucket */
state->offset = 0;
p = 0;
}
return NULL;
}
static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
struct inet6_ifaddr *ifa)
{
struct if6_iter_state *state = seq->private;
struct net *net = seq_file_net(seq);
struct hlist_node *n = &ifa->addr_lst;
hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
state->offset++;
return ifa;
}
while (++state->bucket < IN6_ADDR_HSIZE) {
state->offset = 0;
hlist_for_each_entry_rcu_bh(ifa, n,
&inet6_addr_lst[state->bucket], addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
state->offset++;
return ifa;
}
}
return NULL;
}
static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(rcu_bh)
{
rcu_read_lock_bh();
return if6_get_first(seq, *pos);
}
static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct inet6_ifaddr *ifa;
ifa = if6_get_next(seq, v);
++*pos;
return ifa;
}
static void if6_seq_stop(struct seq_file *seq, void *v)
__releases(rcu_bh)
{
rcu_read_unlock_bh();
}
static int if6_seq_show(struct seq_file *seq, void *v)
{
struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
&ifp->addr,
ifp->idev->dev->ifindex,
ifp->prefix_len,
ifp->scope,
ifp->flags,
ifp->idev->dev->name);
return 0;
}
static const struct seq_operations if6_seq_ops = {
.start = if6_seq_start,
.next = if6_seq_next,
.show = if6_seq_show,
.stop = if6_seq_stop,
};
static int if6_seq_open(struct inode *inode, struct file *file)
{
return seq_open_net(inode, file, &if6_seq_ops,
sizeof(struct if6_iter_state));
}
static const struct file_operations if6_fops = {
.owner = THIS_MODULE,
.open = if6_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_net,
};
static int __net_init if6_proc_net_init(struct net *net)
{
if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
return -ENOMEM;
return 0;
}
static void __net_exit if6_proc_net_exit(struct net *net)
{
proc_net_remove(net, "if_inet6");
}
static struct pernet_operations if6_proc_net_ops = {
.init = if6_proc_net_init,
.exit = if6_proc_net_exit,
};
int __init if6_proc_init(void)
{
return register_pernet_subsys(&if6_proc_net_ops);
}
void if6_proc_exit(void)
{
unregister_pernet_subsys(&if6_proc_net_ops);
}
#endif /* CONFIG_PROC_FS */
#if IS_ENABLED(CONFIG_IPV6_MIP6)
/* Check if address is a home address configured on any interface. */
int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
{
int ret = 0;
struct inet6_ifaddr *ifp = NULL;
struct hlist_node *n;
unsigned int hash = inet6_addr_hash(addr);
rcu_read_lock_bh();
hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
if (!net_eq(dev_net(ifp->idev->dev), net))
continue;
if (ipv6_addr_equal(&ifp->addr, addr) &&
(ifp->flags & IFA_F_HOMEADDRESS)) {
ret = 1;
break;
}
}
rcu_read_unlock_bh();
return ret;
}
#endif
/*
* Periodic address status verification
*/
static void addrconf_verify(unsigned long foo)
{
unsigned long now, next, next_sec, next_sched;
struct inet6_ifaddr *ifp;
struct hlist_node *node;
int i;
rcu_read_lock_bh();
spin_lock(&addrconf_verify_lock);
now = jiffies;
next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
del_timer(&addr_chk_timer);
for (i = 0; i < IN6_ADDR_HSIZE; i++) {
restart:
hlist_for_each_entry_rcu_bh(ifp, node,
&inet6_addr_lst[i], addr_lst) {
unsigned long age;
if (ifp->flags & IFA_F_PERMANENT)
continue;
spin_lock(&ifp->lock);
/* We try to batch several events at once. */
age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
if (ifp->valid_lft != INFINITY_LIFE_TIME &&
age >= ifp->valid_lft) {
spin_unlock(&ifp->lock);
in6_ifa_hold(ifp);
ipv6_del_addr(ifp);
goto restart;
} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
spin_unlock(&ifp->lock);
continue;
} else if (age >= ifp->prefered_lft) {
IPv6: preferred lifetime of address not getting updated There's a bug in addrconf_prefix_rcv() where it won't update the preferred lifetime of an IPv6 address if the current valid lifetime of the address is less than 2 hours (the minimum value in the RA). For example, If I send a router advertisement with a prefix that has valid lifetime = preferred lifetime = 2 hours we'll build this address: 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic valid_lft 7175sec preferred_lft 7175sec If I then send the same prefix with valid lifetime = preferred lifetime = 0 it will be ignored since the minimum valid lifetime is 2 hours: 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:217:8ff:fe7d:4718/64 scope global dynamic valid_lft 7161sec preferred_lft 7161sec But according to RFC 4862 we should always reset the preferred lifetime even if the valid lifetime is invalid, which would cause the address to immediately get deprecated. So with this patch we'd see this: 5: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:1890:1109:a20:21f:29ff:fe5a:ef04/64 scope global deprecated dynamic valid_lft 7163sec preferred_lft 0sec The comment winds-up being 5x the size of the code to fix the problem. Update the preferred lifetime of IPv6 addresses derived from a prefix info option in a router advertisement even if the valid lifetime in the option is invalid, as specified in RFC 4862 Section 5.5.3e. Fixes an issue where an address will not immediately become deprecated. Reported by Jens Rosenboom. Signed-off-by: Brian Haley <brian.haley@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-07-02 07:10:52 +00:00
/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
int deprecate = 0;
if (!(ifp->flags&IFA_F_DEPRECATED)) {
deprecate = 1;
ifp->flags |= IFA_F_DEPRECATED;
}
if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
next = ifp->tstamp + ifp->valid_lft * HZ;
spin_unlock(&ifp->lock);
if (deprecate) {
in6_ifa_hold(ifp);
ipv6_ifa_notify(0, ifp);
in6_ifa_put(ifp);
goto restart;
}
#ifdef CONFIG_IPV6_PRIVACY
} else if ((ifp->flags&IFA_F_TEMPORARY) &&
!(ifp->flags&IFA_F_TENTATIVE)) {
unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
ifp->idev->cnf.dad_transmits *
ifp->idev->nd_parms->retrans_time / HZ;
if (age >= ifp->prefered_lft - regen_advance) {
struct inet6_ifaddr *ifpub = ifp->ifpub;
if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
next = ifp->tstamp + ifp->prefered_lft * HZ;
if (!ifp->regen_count && ifpub) {
ifp->regen_count++;
in6_ifa_hold(ifp);
in6_ifa_hold(ifpub);
spin_unlock(&ifp->lock);
spin_lock(&ifpub->lock);
ifpub->regen_count = 0;
spin_unlock(&ifpub->lock);
ipv6_create_tempaddr(ifpub, ifp);
in6_ifa_put(ifpub);
in6_ifa_put(ifp);
goto restart;
}
} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
spin_unlock(&ifp->lock);
#endif
} else {
/* ifp->prefered_lft <= ifp->valid_lft */
if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
next = ifp->tstamp + ifp->prefered_lft * HZ;
spin_unlock(&ifp->lock);
}
}
}
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;
/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
now, next, next_sec, next_sched));
addr_chk_timer.expires = next_sched;
add_timer(&addr_chk_timer);
spin_unlock(&addrconf_verify_lock);
rcu_read_unlock_bh();
}
static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
{
struct in6_addr *pfx = NULL;
if (addr)
pfx = nla_data(addr);
if (local) {
if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
pfx = NULL;
else
pfx = nla_data(local);
}
return pfx;
}
static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
[IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
[IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
[IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
};
static int
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
struct ifaddrmsg *ifm;
struct nlattr *tb[IFA_MAX+1];
struct in6_addr *pfx;
int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
if (err < 0)
return err;
ifm = nlmsg_data(nlh);
pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
if (pfx == NULL)
return -EINVAL;
return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
}
static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
u32 prefered_lft, u32 valid_lft)
{
u32 flags;
clock_t expires;
unsigned long timeout;
if (!valid_lft || (prefered_lft > valid_lft))
return -EINVAL;
timeout = addrconf_timeout_fixup(valid_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
expires = jiffies_to_clock_t(timeout * HZ);
valid_lft = timeout;
flags = RTF_EXPIRES;
} else {
expires = 0;
flags = 0;
ifa_flags |= IFA_F_PERMANENT;
}
timeout = addrconf_timeout_fixup(prefered_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
if (timeout == 0)
ifa_flags |= IFA_F_DEPRECATED;
prefered_lft = timeout;
}
spin_lock_bh(&ifp->lock);
ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
ifp->tstamp = jiffies;
ifp->valid_lft = valid_lft;
ifp->prefered_lft = prefered_lft;
spin_unlock_bh(&ifp->lock);
if (!(ifp->flags&IFA_F_TENTATIVE))
ipv6_ifa_notify(0, ifp);
addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
expires, flags);
addrconf_verify(0);
return 0;
}
static int
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
struct ifaddrmsg *ifm;
struct nlattr *tb[IFA_MAX+1];
struct in6_addr *pfx;
struct inet6_ifaddr *ifa;
struct net_device *dev;
u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
u8 ifa_flags;
int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
if (err < 0)
return err;
ifm = nlmsg_data(nlh);
pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
if (pfx == NULL)
return -EINVAL;
if (tb[IFA_CACHEINFO]) {
struct ifa_cacheinfo *ci;
ci = nla_data(tb[IFA_CACHEINFO]);
valid_lft = ci->ifa_valid;
preferred_lft = ci->ifa_prefered;
} else {
preferred_lft = INFINITY_LIFE_TIME;
valid_lft = INFINITY_LIFE_TIME;
}
dev = __dev_get_by_index(net, ifm->ifa_index);
if (dev == NULL)
return -ENODEV;
/* We ignore other flags so far. */
ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
if (ifa == NULL) {
/*
* It would be best to check for !NLM_F_CREATE here but
* userspace alreay relies on not having to provide this.
*/
return inet6_addr_add(net, ifm->ifa_index, pfx,
ifm->ifa_prefixlen, ifa_flags,
preferred_lft, valid_lft);
}
if (nlh->nlmsg_flags & NLM_F_EXCL ||
!(nlh->nlmsg_flags & NLM_F_REPLACE))
err = -EEXIST;
else
err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
in6_ifa_put(ifa);
return err;
}
static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
u8 scope, int ifindex)
{
struct ifaddrmsg *ifm;
ifm = nlmsg_data(nlh);
ifm->ifa_family = AF_INET6;
ifm->ifa_prefixlen = prefixlen;
ifm->ifa_flags = flags;
ifm->ifa_scope = scope;
ifm->ifa_index = ifindex;
}
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 inline int rt_scope(int ifa_scope)
{
if (ifa_scope & IFA_HOST)
return RT_SCOPE_HOST;
else if (ifa_scope & IFA_LINK)
return RT_SCOPE_LINK;
else if (ifa_scope & IFA_SITE)
return RT_SCOPE_SITE;
else
return RT_SCOPE_UNIVERSE;
}
static inline int inet6_ifaddr_msgsize(void)
{
return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+ nla_total_size(16) /* IFA_ADDRESS */
+ nla_total_size(sizeof(struct ifa_cacheinfo));
}
static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
u32 portid, u32 seq, int event, unsigned int flags)
{
struct nlmsghdr *nlh;
u32 preferred, valid;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
if (nlh == NULL)
return -EMSGSIZE;
put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
ifa->idev->dev->ifindex);
if (!(ifa->flags&IFA_F_PERMANENT)) {
preferred = ifa->prefered_lft;
valid = ifa->valid_lft;
if (preferred != INFINITY_LIFE_TIME) {
long tval = (jiffies - 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 (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
return nlmsg_end(skb, nlh);
}
static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
u32 portid, u32 seq, int event, u16 flags)
{
struct nlmsghdr *nlh;
u8 scope = RT_SCOPE_UNIVERSE;
int ifindex = ifmca->idev->dev->ifindex;
if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
scope = RT_SCOPE_SITE;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
if (nlh == NULL)
return -EMSGSIZE;
put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
return nlmsg_end(skb, nlh);
}
static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
u32 portid, u32 seq, int event, unsigned int flags)
{
struct nlmsghdr *nlh;
u8 scope = RT_SCOPE_UNIVERSE;
int ifindex = ifaca->aca_idev->dev->ifindex;
if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
scope = RT_SCOPE_SITE;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
if (nlh == NULL)
return -EMSGSIZE;
put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
return nlmsg_end(skb, nlh);
}
enum addr_type_t {
UNICAST_ADDR,
MULTICAST_ADDR,
ANYCAST_ADDR,
};
/* called with rcu_read_lock() */
static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
struct netlink_callback *cb, enum addr_type_t type,
int s_ip_idx, int *p_ip_idx)
{
struct ifmcaddr6 *ifmca;
struct ifacaddr6 *ifaca;
int err = 1;
int ip_idx = *p_ip_idx;
read_lock_bh(&idev->lock);
switch (type) {
case UNICAST_ADDR: {
struct inet6_ifaddr *ifa;
/* unicast address incl. temp addr */
list_for_each_entry(ifa, &idev->addr_list, if_list) {
if (++ip_idx < s_ip_idx)
continue;
err = inet6_fill_ifaddr(skb, ifa,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
RTM_NEWADDR,
NLM_F_MULTI);
if (err <= 0)
break;
}
break;
}
case MULTICAST_ADDR:
/* multicast address */
for (ifmca = idev->mc_list; ifmca;
ifmca = ifmca->next, ip_idx++) {
if (ip_idx < s_ip_idx)
continue;
err = inet6_fill_ifmcaddr(skb, ifmca,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
RTM_GETMULTICAST,
NLM_F_MULTI);
if (err <= 0)
break;
}
break;
case ANYCAST_ADDR:
/* anycast address */
for (ifaca = idev->ac_list; ifaca;
ifaca = ifaca->aca_next, ip_idx++) {
if (ip_idx < s_ip_idx)
continue;
err = inet6_fill_ifacaddr(skb, ifaca,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
RTM_GETANYCAST,
NLM_F_MULTI);
if (err <= 0)
break;
}
break;
default:
break;
}
read_unlock_bh(&idev->lock);
*p_ip_idx = ip_idx;
return err;
}
static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
enum addr_type_t type)
{
struct net *net = sock_net(skb->sk);
int h, s_h;
int idx, ip_idx;
int s_idx, s_ip_idx;
struct net_device *dev;
struct inet6_dev *idev;
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];
rcu_read_lock();
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &net->dev_index_head[h];
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;
ip_idx = 0;
idev = __in6_dev_get(dev);
if (!idev)
goto cont;
if (in6_dump_addrs(idev, skb, cb, type,
s_ip_idx, &ip_idx) <= 0)
goto done;
cont:
idx++;
}
}
done:
rcu_read_unlock();
cb->args[0] = h;
cb->args[1] = idx;
cb->args[2] = ip_idx;
return skb->len;
}
static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
enum addr_type_t type = UNICAST_ADDR;
return inet6_dump_addr(skb, cb, type);
}
static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
enum addr_type_t type = MULTICAST_ADDR;
return inet6_dump_addr(skb, cb, type);
}
static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
enum addr_type_t type = ANYCAST_ADDR;
return inet6_dump_addr(skb, cb, type);
}
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
void *arg)
{
struct net *net = sock_net(in_skb->sk);
struct ifaddrmsg *ifm;
struct nlattr *tb[IFA_MAX+1];
struct in6_addr *addr = NULL;
struct net_device *dev = NULL;
struct inet6_ifaddr *ifa;
struct sk_buff *skb;
int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
if (err < 0)
goto errout;
addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
if (addr == NULL) {
err = -EINVAL;
goto errout;
}
ifm = nlmsg_data(nlh);
if (ifm->ifa_index)
dev = __dev_get_by_index(net, ifm->ifa_index);
ifa = ipv6_get_ifaddr(net, addr, dev, 1);
if (!ifa) {
err = -EADDRNOTAVAIL;
goto errout;
}
skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
if (!skb) {
err = -ENOBUFS;
goto errout_ifa;
}
err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWADDR, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout_ifa;
}
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout_ifa:
in6_ifa_put(ifa);
errout:
return err;
}
static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
{
struct sk_buff *skb;
struct net *net = dev_net(ifa->idev->dev);
int err = -ENOBUFS;
skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
2009-02-25 07:18:28 +00:00
rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
}
static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
__s32 *array, int bytes)
{
BUG_ON(bytes < (DEVCONF_MAX * 4));
memset(array, 0, bytes);
array[DEVCONF_FORWARDING] = cnf->forwarding;
array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
array[DEVCONF_MTU6] = cnf->mtu6;
array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
array[DEVCONF_AUTOCONF] = cnf->autoconf;
array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
array[DEVCONF_RTR_SOLICIT_INTERVAL] =
jiffies_to_msecs(cnf->rtr_solicit_interval);
array[DEVCONF_RTR_SOLICIT_DELAY] =
jiffies_to_msecs(cnf->rtr_solicit_delay);
array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
#ifdef CONFIG_IPV6_PRIVACY
array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
#endif
array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
#ifdef CONFIG_IPV6_ROUTER_PREF
array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
array[DEVCONF_RTR_PROBE_INTERVAL] =
jiffies_to_msecs(cnf->rtr_probe_interval);
#ifdef CONFIG_IPV6_ROUTE_INFO
array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
#endif
#endif
array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
#endif
#ifdef CONFIG_IPV6_MROUTE
array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
#endif
array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
}
static inline size_t inet6_ifla6_size(void)
{
return nla_total_size(4) /* IFLA_INET6_FLAGS */
+ nla_total_size(sizeof(struct ifla_cacheinfo))
+ nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
+ nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
+ nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
}
static inline size_t inet6_if_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ nla_total_size(4) /* IFLA_MTU */
+ nla_total_size(4) /* IFLA_LINK */
+ nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
}
static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
int items, int bytes)
{
int i;
int pad = bytes - sizeof(u64) * items;
BUG_ON(pad < 0);
/* Use put_unaligned() because stats may not be aligned for u64. */
put_unaligned(items, &stats[0]);
for (i = 1; i < items; i++)
put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
memset(&stats[items], 0, pad);
}
static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
int items, int bytes, size_t syncpoff)
{
int i;
int pad = bytes - sizeof(u64) * items;
BUG_ON(pad < 0);
/* Use put_unaligned() because stats may not be aligned for u64. */
put_unaligned(items, &stats[0]);
for (i = 1; i < items; i++)
put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
memset(&stats[items], 0, pad);
}
static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
int bytes)
{
switch (attrtype) {
case IFLA_INET6_STATS:
__snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
break;
case IFLA_INET6_ICMP6STATS:
__snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
break;
}
}
static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
{
struct nlattr *nla;
struct ifla_cacheinfo ci;
if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
goto nla_put_failure;
ci.max_reasm_len = IPV6_MAXPLEN;
ci.tstamp = cstamp_delta(idev->tstamp);
ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
goto nla_put_failure;
nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
if (nla == NULL)
goto nla_put_failure;
ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
/* XXX - MC not implemented */
nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
if (nla == NULL)
goto nla_put_failure;
snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
if (nla == NULL)
goto nla_put_failure;
snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static size_t inet6_get_link_af_size(const struct net_device *dev)
{
if (!__in6_dev_get(dev))
return 0;
return inet6_ifla6_size();
}
static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
{
struct inet6_dev *idev = __in6_dev_get(dev);
if (!idev)
return -ENODATA;
if (inet6_fill_ifla6_attrs(skb, idev) < 0)
return -EMSGSIZE;
return 0;
}
static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
u32 portid, u32 seq, int event, unsigned int flags)
{
struct net_device *dev = idev->dev;
struct ifinfomsg *hdr;
struct nlmsghdr *nlh;
void *protoinfo;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
if (nlh == NULL)
return -EMSGSIZE;
hdr = nlmsg_data(nlh);
hdr->ifi_family = AF_INET6;
hdr->__ifi_pad = 0;
hdr->ifi_type = dev->type;
hdr->ifi_index = dev->ifindex;
hdr->ifi_flags = dev_get_flags(dev);
hdr->ifi_change = 0;
if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
(dev->addr_len &&
nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
(dev->ifindex != dev->iflink &&
nla_put_u32(skb, IFLA_LINK, dev->iflink)))
goto nla_put_failure;
protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
if (protoinfo == NULL)
goto nla_put_failure;
if (inet6_fill_ifla6_attrs(skb, idev) < 0)
goto nla_put_failure;
nla_nest_end(skb, protoinfo);
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
int h, s_h;
int idx = 0, s_idx;
struct net_device *dev;
struct inet6_dev *idev;
struct hlist_head *head;
struct hlist_node *node;
s_h = cb->args[0];
s_idx = cb->args[1];
rcu_read_lock();
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &net->dev_index_head[h];
hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
if (idx < s_idx)
goto cont;
idev = __in6_dev_get(dev);
if (!idev)
goto cont;
if (inet6_fill_ifinfo(skb, idev,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
RTM_NEWLINK, NLM_F_MULTI) <= 0)
goto out;
cont:
idx++;
}
}
out:
rcu_read_unlock();
cb->args[1] = idx;
cb->args[0] = h;
return skb->len;
}
void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
{
struct sk_buff *skb;
struct net *net = dev_net(idev->dev);
int err = -ENOBUFS;
skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
2009-02-25 07:18:28 +00:00
return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
}
static inline size_t inet6_prefix_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct prefixmsg))
+ nla_total_size(sizeof(struct in6_addr))
+ nla_total_size(sizeof(struct prefix_cacheinfo));
}
static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
struct prefix_info *pinfo, u32 portid, u32 seq,
int event, unsigned int flags)
{
struct prefixmsg *pmsg;
struct nlmsghdr *nlh;
struct prefix_cacheinfo ci;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
if (nlh == NULL)
return -EMSGSIZE;
pmsg = nlmsg_data(nlh);
pmsg->prefix_family = AF_INET6;
pmsg->prefix_pad1 = 0;
pmsg->prefix_pad2 = 0;
pmsg->prefix_ifindex = idev->dev->ifindex;
pmsg->prefix_len = pinfo->prefix_len;
pmsg->prefix_type = pinfo->type;
pmsg->prefix_pad3 = 0;
pmsg->prefix_flags = 0;
if (pinfo->onlink)
pmsg->prefix_flags |= IF_PREFIX_ONLINK;
if (pinfo->autoconf)
pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
goto nla_put_failure;
ci.preferred_time = ntohl(pinfo->prefered);
ci.valid_time = ntohl(pinfo->valid);
if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
goto nla_put_failure;
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static void inet6_prefix_notify(int event, struct inet6_dev *idev,
struct prefix_info *pinfo)
{
struct sk_buff *skb;
struct net *net = dev_net(idev->dev);
int err = -ENOBUFS;
skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
2009-02-25 07:18:28 +00:00
rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
}
static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
switch (event) {
case RTM_NEWADDR:
/*
* If the address was optimistic
* we inserted the route at the start of
* our DAD process, so we don't need
* to do it again
*/
if (!(ifp->rt->rt6i_node))
ip6_ins_rt(ifp->rt);
if (ifp->idev->cnf.forwarding)
addrconf_join_anycast(ifp);
break;
case RTM_DELADDR:
if (ifp->idev->cnf.forwarding)
addrconf_leave_anycast(ifp);
addrconf_leave_solict(ifp->idev, &ifp->addr);
dst_hold(&ifp->rt->dst);
2011-01-24 07:27:15 +00:00
if (ip6_del_rt(ifp->rt))
dst_free(&ifp->rt->dst);
break;
}
}
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
rcu_read_lock_bh();
if (likely(ifp->idev->dead == 0))
__ipv6_ifa_notify(event, ifp);
rcu_read_unlock_bh();
}
#ifdef CONFIG_SYSCTL
static
int addrconf_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;
ctl_table lctl;
int ret;
/*
* ctl->data points to idev->cnf.forwarding, we should
* not modify it until we get the rtnl lock.
*/
lctl = *ctl;
lctl.data = &val;
ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
if (write)
ret = addrconf_fixup_forwarding(ctl, valp, val);
if (ret)
*ppos = pos;
return ret;
}
static void dev_disable_change(struct inet6_dev *idev)
{
if (!idev || !idev->dev)
return;
if (idev->cnf.disable_ipv6)
addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
else
addrconf_notify(NULL, NETDEV_UP, idev->dev);
}
static void addrconf_disable_change(struct net *net, __s32 newf)
{
struct net_device *dev;
struct inet6_dev *idev;
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
idev = __in6_dev_get(dev);
if (idev) {
int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
idev->cnf.disable_ipv6 = newf;
if (changed)
dev_disable_change(idev);
}
}
rcu_read_unlock();
}
static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
{
struct net *net;
int old;
if (!rtnl_trylock())
return restart_syscall();
net = (struct net *)table->extra2;
old = *p;
*p = newf;
if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
rtnl_unlock();
return 0;
}
if (p == &net->ipv6.devconf_all->disable_ipv6) {
net->ipv6.devconf_dflt->disable_ipv6 = newf;
addrconf_disable_change(net, newf);
} else if ((!newf) ^ (!old))
dev_disable_change((struct inet6_dev *)table->extra1);
rtnl_unlock();
return 0;
}
static
int addrconf_sysctl_disable(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;
ctl_table lctl;
int ret;
/*
* ctl->data points to idev->cnf.disable_ipv6, we should
* not modify it until we get the rtnl lock.
*/
lctl = *ctl;
lctl.data = &val;
ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
if (write)
ret = addrconf_disable_ipv6(ctl, valp, val);
if (ret)
*ppos = pos;
return ret;
}
static struct addrconf_sysctl_table
{
struct ctl_table_header *sysctl_header;
ctl_table addrconf_vars[DEVCONF_MAX+1];
} addrconf_sysctl __read_mostly = {
.sysctl_header = NULL,
.addrconf_vars = {
{
.procname = "forwarding",
.data = &ipv6_devconf.forwarding,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = addrconf_sysctl_forward,
},
{
.procname = "hop_limit",
.data = &ipv6_devconf.hop_limit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "mtu",
.data = &ipv6_devconf.mtu6,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "accept_ra",
.data = &ipv6_devconf.accept_ra,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "accept_redirects",
.data = &ipv6_devconf.accept_redirects,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "autoconf",
.data = &ipv6_devconf.autoconf,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "dad_transmits",
.data = &ipv6_devconf.dad_transmits,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "router_solicitations",
.data = &ipv6_devconf.rtr_solicits,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "router_solicitation_interval",
.data = &ipv6_devconf.rtr_solicit_interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "router_solicitation_delay",
.data = &ipv6_devconf.rtr_solicit_delay,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "force_mld_version",
.data = &ipv6_devconf.force_mld_version,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_IPV6_PRIVACY
{
.procname = "use_tempaddr",
.data = &ipv6_devconf.use_tempaddr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "temp_valid_lft",
.data = &ipv6_devconf.temp_valid_lft,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "temp_prefered_lft",
.data = &ipv6_devconf.temp_prefered_lft,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "regen_max_retry",
.data = &ipv6_devconf.regen_max_retry,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "max_desync_factor",
.data = &ipv6_devconf.max_desync_factor,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
{
.procname = "max_addresses",
.data = &ipv6_devconf.max_addresses,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "accept_ra_defrtr",
.data = &ipv6_devconf.accept_ra_defrtr,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "accept_ra_pinfo",
.data = &ipv6_devconf.accept_ra_pinfo,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_IPV6_ROUTER_PREF
{
.procname = "accept_ra_rtr_pref",
.data = &ipv6_devconf.accept_ra_rtr_pref,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "router_probe_interval",
.data = &ipv6_devconf.rtr_probe_interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#ifdef CONFIG_IPV6_ROUTE_INFO
{
.procname = "accept_ra_rt_info_max_plen",
.data = &ipv6_devconf.accept_ra_rt_info_max_plen,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
#endif
{
.procname = "proxy_ndp",
.data = &ipv6_devconf.proxy_ndp,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "accept_source_route",
.data = &ipv6_devconf.accept_source_route,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
{
.procname = "optimistic_dad",
.data = &ipv6_devconf.optimistic_dad,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
#ifdef CONFIG_IPV6_MROUTE
{
.procname = "mc_forwarding",
.data = &ipv6_devconf.mc_forwarding,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = proc_dointvec,
},
#endif
{
.procname = "disable_ipv6",
.data = &ipv6_devconf.disable_ipv6,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = addrconf_sysctl_disable,
},
{
.procname = "accept_dad",
.data = &ipv6_devconf.accept_dad,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "force_tllao",
.data = &ipv6_devconf.force_tllao,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "ndisc_notify",
.data = &ipv6_devconf.ndisc_notify,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
/* sentinel */
}
},
};
static int __addrconf_sysctl_register(struct net *net, char *dev_name,
struct inet6_dev *idev, struct ipv6_devconf *p)
{
int i;
struct addrconf_sysctl_table *t;
char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
if (t == NULL)
goto out;
for (i = 0; t->addrconf_vars[i].data; i++) {
t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
t->addrconf_vars[i].extra2 = net;
}
snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
if (t->sysctl_header == NULL)
goto free;
p->sysctl = t;
return 0;
free:
kfree(t);
out:
return -ENOBUFS;
}
static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
{
struct addrconf_sysctl_table *t;
if (p->sysctl == NULL)
return;
t = p->sysctl;
p->sysctl = NULL;
unregister_net_sysctl_table(t->sysctl_header);
kfree(t);
}
static void addrconf_sysctl_register(struct inet6_dev *idev)
{
neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
&ndisc_ifinfo_sysctl_change);
__addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
idev, &idev->cnf);
}
static void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
__addrconf_sysctl_unregister(&idev->cnf);
neigh_sysctl_unregister(idev->nd_parms);
}
#endif
static int __net_init addrconf_init_net(struct net *net)
{
int err;
struct ipv6_devconf *all, *dflt;
err = -ENOMEM;
all = &ipv6_devconf;
dflt = &ipv6_devconf_dflt;
if (!net_eq(net, &init_net)) {
all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
if (all == NULL)
goto err_alloc_all;
dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
if (dflt == NULL)
goto err_alloc_dflt;
} else {
/* these will be inherited by all namespaces */
dflt->autoconf = ipv6_defaults.autoconf;
dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
}
net->ipv6.devconf_all = all;
net->ipv6.devconf_dflt = dflt;
#ifdef CONFIG_SYSCTL
err = __addrconf_sysctl_register(net, "all", NULL, all);
if (err < 0)
goto err_reg_all;
err = __addrconf_sysctl_register(net, "default", NULL, dflt);
if (err < 0)
goto err_reg_dflt;
#endif
return 0;
#ifdef CONFIG_SYSCTL
err_reg_dflt:
__addrconf_sysctl_unregister(all);
err_reg_all:
kfree(dflt);
#endif
err_alloc_dflt:
kfree(all);
err_alloc_all:
return err;
}
static void __net_exit addrconf_exit_net(struct net *net)
{
#ifdef CONFIG_SYSCTL
__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
__addrconf_sysctl_unregister(net->ipv6.devconf_all);
#endif
if (!net_eq(net, &init_net)) {
kfree(net->ipv6.devconf_dflt);
kfree(net->ipv6.devconf_all);
}
}
static struct pernet_operations addrconf_ops = {
.init = addrconf_init_net,
.exit = addrconf_exit_net,
};
/*
* Device notifier
*/
int register_inet6addr_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&inet6addr_chain, nb);
}
EXPORT_SYMBOL(register_inet6addr_notifier);
int unregister_inet6addr_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
}
EXPORT_SYMBOL(unregister_inet6addr_notifier);
static struct rtnl_af_ops inet6_ops = {
.family = AF_INET6,
.fill_link_af = inet6_fill_link_af,
.get_link_af_size = inet6_get_link_af_size,
};
/*
* Init / cleanup code
*/
int __init addrconf_init(void)
{
int i, err;
err = ipv6_addr_label_init();
if (err < 0) {
pr_crit("%s: cannot initialize default policy table: %d\n",
__func__, err);
goto out;
}
err = register_pernet_subsys(&addrconf_ops);
if (err < 0)
goto out_addrlabel;
/* The addrconf netdev notifier requires that loopback_dev
* has it's ipv6 private information allocated and setup
* before it can bring up and give link-local addresses
* to other devices which are up.
*
* Unfortunately, loopback_dev is not necessarily the first
* entry in the global dev_base list of net devices. In fact,
* it is likely to be the very last entry on that list.
* So this causes the notifier registry below to try and
* give link-local addresses to all devices besides loopback_dev
* first, then loopback_dev, which cases all the non-loopback_dev
* devices to fail to get a link-local address.
*
* So, as a temporary fix, allocate the ipv6 structure for
* loopback_dev first by hand.
* Longer term, all of the dependencies ipv6 has upon the loopback
* device and it being up should be removed.
*/
rtnl_lock();
if (!ipv6_add_dev(init_net.loopback_dev))
err = -ENOMEM;
rtnl_unlock();
if (err)
goto errlo;
for (i = 0; i < IN6_ADDR_HSIZE; i++)
INIT_HLIST_HEAD(&inet6_addr_lst[i]);
register_netdevice_notifier(&ipv6_dev_notf);
addrconf_verify(0);
err = rtnl_af_register(&inet6_ops);
if (err < 0)
goto errout_af;
err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
NULL);
if (err < 0)
goto errout;
/* Only the first call to __rtnl_register can fail */
__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
inet6_dump_ifaddr, NULL);
__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
inet6_dump_ifmcaddr, NULL);
__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
inet6_dump_ifacaddr, NULL);
__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
NULL, NULL);
ipv6_addr_label_rtnl_register();
return 0;
errout:
rtnl_af_unregister(&inet6_ops);
errout_af:
unregister_netdevice_notifier(&ipv6_dev_notf);
errlo:
unregister_pernet_subsys(&addrconf_ops);
out_addrlabel:
ipv6_addr_label_cleanup();
out:
return err;
}
void addrconf_cleanup(void)
{
struct net_device *dev;
int i;
unregister_netdevice_notifier(&ipv6_dev_notf);
unregister_pernet_subsys(&addrconf_ops);
ipv6_addr_label_cleanup();
rtnl_lock();
__rtnl_af_unregister(&inet6_ops);
/* clean dev list */
for_each_netdev(&init_net, dev) {
if (__in6_dev_get(dev) == NULL)
continue;
addrconf_ifdown(dev, 1);
}
addrconf_ifdown(init_net.loopback_dev, 2);
/*
* Check hash table.
*/
spin_lock_bh(&addrconf_hash_lock);
for (i = 0; i < IN6_ADDR_HSIZE; i++)
WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
spin_unlock_bh(&addrconf_hash_lock);
del_timer(&addr_chk_timer);
rtnl_unlock();
}